diff options
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/Kconfig | 63 | ||||
| -rw-r--r-- | drivers/mmc/Makefile | 22 | ||||
| -rw-r--r-- | drivers/mmc/mmc.c | 914 | ||||
| -rw-r--r-- | drivers/mmc/mmc.h | 16 | ||||
| -rw-r--r-- | drivers/mmc/mmc_block.c | 509 | ||||
| -rw-r--r-- | drivers/mmc/mmc_queue.c | 238 | ||||
| -rw-r--r-- | drivers/mmc/mmc_queue.h | 33 | ||||
| -rw-r--r-- | drivers/mmc/mmc_sysfs.c | 238 | ||||
| -rw-r--r-- | drivers/mmc/mmci.c | 680 | ||||
| -rw-r--r-- | drivers/mmc/mmci.h | 179 | ||||
| -rw-r--r-- | drivers/mmc/pxamci.c | 610 | ||||
| -rw-r--r-- | drivers/mmc/pxamci.h | 124 | ||||
| -rw-r--r-- | drivers/mmc/wbsd.c | 1651 | ||||
| -rw-r--r-- | drivers/mmc/wbsd.h | 178 |
14 files changed, 5455 insertions, 0 deletions
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig new file mode 100644 index 00000000000..72f2b466b81 --- /dev/null +++ b/drivers/mmc/Kconfig @@ -0,0 +1,63 @@ +# +# MMC subsystem configuration +# + +menu "MMC/SD Card support" + +config MMC + tristate "MMC support" + help + MMC is the "multi-media card" bus protocol. + + If you want MMC support, you should say Y here and also + to the specific driver for your MMC interface. + +config MMC_DEBUG + bool "MMC debugging" + depends on MMC != n + help + This is an option for use by developers; most people should + say N here. This enables MMC core and driver debugging. + +config MMC_BLOCK + tristate "MMC block device driver" + depends on MMC + default y + help + Say Y here to enable the MMC block device driver support. + This provides a block device driver, which you can use to + mount the filesystem. Almost everyone wishing MMC support + should say Y or M here. + +config MMC_ARMMMCI + tristate "ARM AMBA Multimedia Card Interface support" + depends on ARM_AMBA && MMC + help + This selects the ARM(R) AMBA(R) PrimeCell Multimedia Card + Interface (PL180 and PL181) support. If you have an ARM(R) + platform with a Multimedia Card slot, say Y or M here. + + If unsure, say N. + +config MMC_PXA + tristate "Intel PXA255 Multimedia Card Interface support" + depends on ARCH_PXA && MMC + help + This selects the Intel(R) PXA(R) Multimedia card Interface. + If you have a PXA(R) platform with a Multimedia Card slot, + say Y or M here. + + If unsure, say N. + +config MMC_WBSD + tristate "Winbond W83L51xD SD/MMC Card Interface support" + depends on MMC && ISA + help + This selects the Winbond(R) W83L51xD Secure digital and + Multimedia card Interface. + If you have a machine with a integrated W83L518D or W83L519D + SD/MMC card reader, say Y or M here. + + If unsure, say N. + +endmenu diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile new file mode 100644 index 00000000000..89510c2086c --- /dev/null +++ b/drivers/mmc/Makefile @@ -0,0 +1,22 @@ +# +# Makefile for the kernel mmc device drivers. +# + +# +# Core +# +obj-$(CONFIG_MMC) += mmc_core.o + +# +# Media drivers +# +obj-$(CONFIG_MMC_BLOCK) += mmc_block.o + +# +# Host drivers +# +obj-$(CONFIG_MMC_ARMMMCI) += mmci.o +obj-$(CONFIG_MMC_PXA) += pxamci.o +obj-$(CONFIG_MMC_WBSD) += wbsd.o + +mmc_core-y := mmc.o mmc_queue.o mmc_sysfs.o diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c new file mode 100644 index 00000000000..e4002632825 --- /dev/null +++ b/drivers/mmc/mmc.c @@ -0,0 +1,914 @@ +/* + * linux/drivers/mmc/mmc.c + * + * Copyright (C) 2003-2004 Russell King, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/completion.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/pagemap.h> +#include <linux/err.h> + +#include <linux/mmc/card.h> +#include <linux/mmc/host.h> +#include <linux/mmc/protocol.h> + +#include "mmc.h" + +#ifdef CONFIG_MMC_DEBUG +#define DBG(x...) printk(KERN_DEBUG x) +#else +#define DBG(x...) do { } while (0) +#endif + +#define CMD_RETRIES 3 + +/* + * OCR Bit positions to 10s of Vdd mV. + */ +static const unsigned short mmc_ocr_bit_to_vdd[] = { + 150, 155, 160, 165, 170, 180, 190, 200, + 210, 220, 230, 240, 250, 260, 270, 280, + 290, 300, 310, 320, 330, 340, 350, 360 +}; + +static const unsigned int tran_exp[] = { + 10000, 100000, 1000000, 10000000, + 0, 0, 0, 0 +}; + +static const unsigned char tran_mant[] = { + 0, 10, 12, 13, 15, 20, 25, 30, + 35, 40, 45, 50, 55, 60, 70, 80, +}; + +static const unsigned int tacc_exp[] = { + 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, +}; + +static const unsigned int tacc_mant[] = { + 0, 10, 12, 13, 15, 20, 25, 30, + 35, 40, 45, 50, 55, 60, 70, 80, +}; + + +/** + * mmc_request_done - finish processing an MMC command + * @host: MMC host which completed command + * @mrq: MMC request which completed + * + * MMC drivers should call this function when they have completed + * their processing of a command. This should be called before the + * data part of the command has completed. + */ +void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) +{ + struct mmc_command *cmd = mrq->cmd; + int err = mrq->cmd->error; + DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode, + err, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); + + if (err && cmd->retries) { + cmd->retries--; + cmd->error = 0; + host->ops->request(host, mrq); + } else if (mrq->done) { + mrq->done(mrq); + } +} + +EXPORT_SYMBOL(mmc_request_done); + +/** + * mmc_start_request - start a command on a host + * @host: MMC host to start command on + * @mrq: MMC request to start + * + * Queue a command on the specified host. We expect the + * caller to be holding the host lock with interrupts disabled. + */ +void +mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) +{ + DBG("MMC: starting cmd %02x arg %08x flags %08x\n", + mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags); + + WARN_ON(host->card_busy == NULL); + + mrq->cmd->error = 0; + mrq->cmd->mrq = mrq; + if (mrq->data) { + mrq->cmd->data = mrq->data; + mrq->data->error = 0; + mrq->data->mrq = mrq; + if (mrq->stop) { + mrq->data->stop = mrq->stop; + mrq->stop->error = 0; + mrq->stop->mrq = mrq; + } + } + host->ops->request(host, mrq); +} + +EXPORT_SYMBOL(mmc_start_request); + +static void mmc_wait_done(struct mmc_request *mrq) +{ + complete(mrq->done_data); +} + +int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) +{ + DECLARE_COMPLETION(complete); + + mrq->done_data = &complete; + mrq->done = mmc_wait_done; + + mmc_start_request(host, mrq); + + wait_for_completion(&complete); + + return 0; +} + +EXPORT_SYMBOL(mmc_wait_for_req); + +/** + * mmc_wait_for_cmd - start a command and wait for completion + * @host: MMC host to start command + * @cmd: MMC command to start + * @retries: maximum number of retries + * + * Start a new MMC command for a host, and wait for the command + * to complete. Return any error that occurred while the command + * was executing. Do not attempt to parse the response. + */ +int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) +{ + struct mmc_request mrq; + + BUG_ON(host->card_busy == NULL); + + memset(&mrq, 0, sizeof(struct mmc_request)); + + memset(cmd->resp, 0, sizeof(cmd->resp)); + cmd->retries = retries; + + mrq.cmd = cmd; + cmd->data = NULL; + + mmc_wait_for_req(host, &mrq); + + return cmd->error; +} + +EXPORT_SYMBOL(mmc_wait_for_cmd); + + + +/** + * __mmc_claim_host - exclusively claim a host + * @host: mmc host to claim + * @card: mmc card to claim host for + * + * Claim a host for a set of operations. If a valid card + * is passed and this wasn't the last card selected, select + * the card before returning. + * + * Note: you should use mmc_card_claim_host or mmc_claim_host. + */ +int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) +{ + DECLARE_WAITQUEUE(wait, current); + unsigned long flags; + int err = 0; + + add_wait_queue(&host->wq, &wait); + spin_lock_irqsave(&host->lock, flags); + while (1) { + set_current_state(TASK_UNINTERRUPTIBLE); + if (host->card_busy == NULL) + break; + spin_unlock_irqrestore(&host->lock, flags); + schedule(); + spin_lock_irqsave(&host->lock, flags); + } + set_current_state(TASK_RUNNING); + host->card_busy = card; + spin_unlock_irqrestore(&host->lock, flags); + remove_wait_queue(&host->wq, &wait); + + if (card != (void *)-1 && host->card_selected != card) { + struct mmc_command cmd; + + host->card_selected = card; + + cmd.opcode = MMC_SELECT_CARD; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1; + + err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); + } + + return err; +} + +EXPORT_SYMBOL(__mmc_claim_host); + +/** + * mmc_release_host - release a host + * @host: mmc host to release + * + * Release a MMC host, allowing others to claim the host + * for their operations. + */ +void mmc_release_host(struct mmc_host *host) +{ + unsigned long flags; + + BUG_ON(host->card_busy == NULL); + + spin_lock_irqsave(&host->lock, flags); + host->card_busy = NULL; + spin_unlock_irqrestore(&host->lock, flags); + + wake_up(&host->wq); +} + +EXPORT_SYMBOL(mmc_release_host); + +/* + * Ensure that no card is selected. + */ +static void mmc_deselect_cards(struct mmc_host *host) +{ + struct mmc_command cmd; + + if (host->card_selected) { + host->card_selected = NULL; + + cmd.opcode = MMC_SELECT_CARD; + cmd.arg = 0; + cmd.flags = MMC_RSP_NONE; + + mmc_wait_for_cmd(host, &cmd, 0); + } +} + + +static inline void mmc_delay(unsigned int ms) +{ + if (ms < HZ / 1000) { + yield(); + mdelay(ms); + } else { + msleep_interruptible (ms); + } +} + +/* + * Mask off any voltages we don't support and select + * the lowest voltage + */ +static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) +{ + int bit; + + ocr &= host->ocr_avail; + + bit = ffs(ocr); + if (bit) { + bit -= 1; + + ocr = 3 << bit; + + host->ios.vdd = bit; + host->ops->set_ios(host, &host->ios); + } else { + ocr = 0; + } + + return ocr; +} + +#define UNSTUFF_BITS(resp,start,size) \ + ({ \ + const int __size = size; \ + const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ + const int __off = 3 - ((start) / 32); \ + const int __shft = (start) & 31; \ + u32 __res; \ + \ + __res = resp[__off] >> __shft; \ + if (__size + __shft > 32) \ + __res |= resp[__off-1] << ((32 - __shft) % 32); \ + __res & __mask; \ + }) + +/* + * Given the decoded CSD structure, decode the raw CID to our CID structure. + */ +static void mmc_decode_cid(struct mmc_card *card) +{ + u32 *resp = card->raw_cid; + + memset(&card->cid, 0, sizeof(struct mmc_cid)); + + /* + * The selection of the format here is guesswork based upon + * information people have sent to date. + */ + switch (card->csd.mmca_vsn) { + case 0: /* MMC v1.? */ + case 1: /* MMC v1.4 */ + card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); + card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); + card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); + card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); + card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); + card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); + card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); + card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); + card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); + card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); + card->cid.serial = UNSTUFF_BITS(resp, 16, 24); + card->cid.month = UNSTUFF_BITS(resp, 12, 4); + card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; + break; + + case 2: /* MMC v2.x ? */ + case 3: /* MMC v3.x ? */ + card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); + card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); + card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); + card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); + card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); + card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); + card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); + card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); + card->cid.serial = UNSTUFF_BITS(resp, 16, 32); + card->cid.month = UNSTUFF_BITS(resp, 12, 4); + card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; + break; + + default: + printk("%s: card has unknown MMCA version %d\n", + card->host->host_name, card->csd.mmca_vsn); + mmc_card_set_bad(card); + break; + } +} + +/* + * Given a 128-bit response, decode to our card CSD structure. + */ +static void mmc_decode_csd(struct mmc_card *card) +{ + struct mmc_csd *csd = &card->csd; + unsigned int e, m, csd_struct; + u32 *resp = card->raw_csd; + + /* + * We only understand CSD structure v1.1 and v2. + * v2 has extra information in bits 15, 11 and 10. + */ + csd_struct = UNSTUFF_BITS(resp, 126, 2); + if (csd_struct != 1 && csd_struct != 2) { + printk("%s: unrecognised CSD structure version %d\n", + card->host->host_name, csd_struct); + mmc_card_set_bad(card); + return; + } + + csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); + m = UNSTUFF_BITS(resp, 115, 4); + e = UNSTUFF_BITS(resp, 112, 3); + csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; + csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; + + m = UNSTUFF_BITS(resp, 99, 4); + e = UNSTUFF_BITS(resp, 96, 3); + csd->max_dtr = tran_exp[e] * tran_mant[m]; + csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); + + e = UNSTUFF_BITS(resp, 47, 3); + m = UNSTUFF_BITS(resp, 62, 12); + csd->capacity = (1 + m) << (e + 2); + + csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); +} + +/* + * Locate a MMC card on this MMC host given a raw CID. + */ +static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) +{ + struct mmc_card *card; + + list_for_each_entry(card, &host->cards, node) { + if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) + return card; + } + return NULL; +} + +/* + * Allocate a new MMC card, and assign a unique RCA. + */ +static struct mmc_card * +mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) +{ + struct mmc_card *card, *c; + unsigned int rca = *frca; + + card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); + if (!card) + return ERR_PTR(-ENOMEM); + + mmc_init_card(card, host); + memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); + + again: + list_for_each_entry(c, &host->cards, node) + if (c->rca == rca) { + rca++; + goto again; + } + + card->rca = rca; + + *frca = rca; + + return card; +} + +/* + * Tell attached cards to go to IDLE state + */ +static void mmc_idle_cards(struct mmc_host *host) +{ + struct mmc_command cmd; + + cmd.opcode = MMC_GO_IDLE_STATE; + cmd.arg = 0; + cmd.flags = MMC_RSP_NONE; + + mmc_wait_for_cmd(host, &cmd, 0); + + mmc_delay(1); +} + +/* + * Apply power to the MMC stack. + */ +static void mmc_power_up(struct mmc_host *host) +{ + int bit = fls(host->ocr_avail) - 1; + + host->ios.vdd = bit; + host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; + host->ios.power_mode = MMC_POWER_UP; + host->ops->set_ios(host, &host->ios); + + mmc_delay(1); + + host->ios.clock = host->f_min; + host->ios.power_mode = MMC_POWER_ON; + host->ops->set_ios(host, &host->ios); + + mmc_delay(2); +} + +static void mmc_power_off(struct mmc_host *host) +{ + host->ios.clock = 0; + host->ios.vdd = 0; + host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; + host->ios.power_mode = MMC_POWER_OFF; + host->ops->set_ios(host, &host->ios); +} + +static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) +{ + struct mmc_command cmd; + int i, err = 0; + + cmd.opcode = MMC_SEND_OP_COND; + cmd.arg = ocr; + cmd.flags = MMC_RSP_R3; + + for (i = 100; i; i--) { + err = mmc_wait_for_cmd(host, &cmd, 0); + if (err != MMC_ERR_NONE) + break; + + if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) + break; + + err = MMC_ERR_TIMEOUT; + + mmc_delay(10); + } + + if (rocr) + *rocr = cmd.resp[0]; + + return err; +} + +/* + * Discover cards by requesting their CID. If this command + * times out, it is not an error; there are no further cards + * to be discovered. Add new cards to the list. + * + * Create a mmc_card entry for each discovered card, assigning + * it an RCA, and save the raw CID for decoding later. + */ +static void mmc_discover_cards(struct mmc_host *host) +{ + struct mmc_card *card; + unsigned int first_rca = 1, err; + + while (1) { + struct mmc_command cmd; + + cmd.opcode = MMC_ALL_SEND_CID; + cmd.arg = 0; + cmd.flags = MMC_RSP_R2; + + err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); + if (err == MMC_ERR_TIMEOUT) { + err = MMC_ERR_NONE; + break; + } + if (err != MMC_ERR_NONE) { + printk(KERN_ERR "%s: error requesting CID: %d\n", + host->host_name, err); + break; + } + + card = mmc_find_card(host, cmd.resp); + if (!card) { + card = mmc_alloc_card(host, cmd.resp, &first_rca); + if (IS_ERR(card)) { + err = PTR_ERR(card); + break; + } + list_add(&card->node, &host->cards); + } + + card->state &= ~MMC_STATE_DEAD; + + cmd.opcode = MMC_SET_RELATIVE_ADDR; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1; + + err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); + if (err != MMC_ERR_NONE) + mmc_card_set_dead(card); + } +} + +static void mmc_read_csds(struct mmc_host *host) +{ + struct mmc_card *card; + + list_for_each_entry(card, &host->cards, node) { + struct mmc_command cmd; + int err; + + if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) + continue; + + cmd.opcode = MMC_SEND_CSD; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R2; + + err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); + if (err != MMC_ERR_NONE) { + mmc_card_set_dead(card); + continue; + } + + memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); + + mmc_decode_csd(card); + mmc_decode_cid(card); + } +} + +static unsigned int mmc_calculate_clock(struct mmc_host *host) +{ + struct mmc_card *card; + unsigned int max_dtr = host->f_max; + + list_for_each_entry(card, &host->cards, node) + if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr) + max_dtr = card->csd.max_dtr; + + DBG("MMC: selected %d.%03dMHz transfer rate\n", + max_dtr / 1000000, (max_dtr / 1000) % 1000); + + return max_dtr; +} + +/* + * Check whether cards we already know about are still present. + * We do this by requesting status, and checking whether a card + * responds. + * + * A request for status does not cause a state change in data + * transfer mode. + */ +static void mmc_check_cards(struct mmc_host *host) +{ + struct list_head *l, *n; + + mmc_deselect_cards(host); + + list_for_each_safe(l, n, &host->cards) { + struct mmc_card *card = mmc_list_to_card(l); + struct mmc_command cmd; + int err; + + cmd.opcode = MMC_SEND_STATUS; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1; + + err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); + if (err == MMC_ERR_NONE) + continue; + + mmc_card_set_dead(card); + } +} + +static void mmc_setup(struct mmc_host *host) +{ + if (host->ios.power_mode != MMC_POWER_ON) { + int err; + u32 ocr; + + mmc_power_up(host); + mmc_idle_cards(host); + + err = mmc_send_op_cond(host, 0, &ocr); + if (err != MMC_ERR_NONE) + return; + + host->ocr = mmc_select_voltage(host, ocr); + + /* + * Since we're changing the OCR value, we seem to + * need to tell some cards to go back to the idle + * state. We wait 1ms to give cards time to + * respond. + */ + if (host->ocr) + mmc_idle_cards(host); + } else { + host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; + host->ios.clock = host->f_min; + host->ops->set_ios(host, &host->ios); + + /* + * We should remember the OCR mask from the existing + * cards, and detect the new cards OCR mask, combine + * the two and re-select the VDD. However, if we do + * change VDD, we should do an idle, and then do a + * full re-initialisation. We would need to notify + * drivers so that they can re-setup the cards as + * well, while keeping their queues at bay. + * + * For the moment, we take the easy way out - if the + * new cards don't like our currently selected VDD, + * they drop off the bus. + */ + } + + if (host->ocr == 0) + return; + + /* + * Send the selected OCR multiple times... until the cards + * all get the idea that they should be ready for CMD2. + * (My SanDisk card seems to need this.) + */ + mmc_send_op_cond(host, host->ocr, NULL); + + mmc_discover_cards(host); + + /* + * Ok, now switch to push-pull mode. + */ + host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; + host->ops->set_ios(host, &host->ios); + + mmc_read_csds(host); +} + + +/** + * mmc_detect_change - process change of state on a MMC socket + * @host: host which changed state. + * + * All we know is that card(s) have been inserted or removed + * from the socket(s). We don't know which socket or cards. + */ +void mmc_detect_change(struct mmc_host *host) +{ + schedule_work(&host->detect); +} + +EXPORT_SYMBOL(mmc_detect_change); + + +static void mmc_rescan(void *data) +{ + struct mmc_host *host = data; + struct list_head *l, *n; + + mmc_claim_host(host); + + if (host->ios.power_mode == MMC_POWER_ON) + mmc_check_cards(host); + + mmc_setup(host); + + if (!list_empty(&host->cards)) { + /* + * (Re-)calculate the fastest clock rate which the + * attached cards and the host support. + */ + host->ios.clock = mmc_calculate_clock(host); + host->ops->set_ios(host, &host->ios); + } + + mmc_release_host(host); + + list_for_each_safe(l, n, &host->cards) { + struct mmc_card *card = mmc_list_to_card(l); + + /* + * If this is a new and good card, register it. + */ + if (!mmc_card_present(card) && !mmc_card_dead(card)) { + if (mmc_register_card(card)) + mmc_card_set_dead(card); + else + mmc_card_set_present(card); + } + + /* + * If this card is dead, destroy it. + */ + if (mmc_card_dead(card)) { + list_del(&card->node); + mmc_remove_card(card); + } + } + + /* + * If we discover that there are no cards on the + * bus, turn off the clock and power down. + */ + if (list_empty(&host->cards)) + mmc_power_off(host); +} + + +/** + * mmc_alloc_host - initialise the per-host structure. + * @extra: sizeof private data structure + * @dev: pointer to host device model structure + * + * Initialise the per-host structure. + */ +struct mmc_host *mmc_alloc_host(int extra, struct device *dev) +{ + struct mmc_host *host; + + host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); + if (host) { + memset(host, 0, sizeof(struct mmc_host) + extra); + + spin_lock_init(&host->lock); + init_waitqueue_head(&host->wq); + INIT_LIST_HEAD(&host->cards); + INIT_WORK(&host->detect, mmc_rescan, host); + + host->dev = dev; + + /* + * By default, hosts do not support SGIO or large requests. + * They have to set these according to their abilities. + */ + host->max_hw_segs = 1; + host->max_phys_segs = 1; + host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9); + host->max_seg_size = PAGE_CACHE_SIZE; + } + + return host; +} + +EXPORT_SYMBOL(mmc_alloc_host); + +/** + * mmc_add_host - initialise host hardware + * @host: mmc host + */ +int mmc_add_host(struct mmc_host *host) +{ + static unsigned int host_num; + + snprintf(host->host_name, sizeof(host->host_name), + "mmc%d", host_num++); + + mmc_power_off(host); + mmc_detect_change(host); + + return 0; +} + +EXPORT_SYMBOL(mmc_add_host); + +/** + * mmc_remove_host - remove host hardware + * @host: mmc host + * + * Unregister and remove all cards associated with this host, + * and power down the MMC bus. + */ +void mmc_remove_host(struct mmc_host *host) +{ + struct list_head *l, *n; + + list_for_each_safe(l, n, &host->cards) { + struct mmc_card *card = mmc_list_to_card(l); + + mmc_remove_card(card); + } + + mmc_power_off(host); +} + +EXPORT_SYMBOL(mmc_remove_host); + +/** + * mmc_free_host - free the host structure + * @host: mmc host + * + * Free the host once all references to it have been dropped. + */ +void mmc_free_host(struct mmc_host *host) +{ + flush_scheduled_work(); + kfree(host); +} + +EXPORT_SYMBOL(mmc_free_host); + +#ifdef CONFIG_PM + +/** + * mmc_suspend_host - suspend a host + * @host: mmc host + * @state: suspend mode (PM_SUSPEND_xxx) + */ +int mmc_suspend_host(struct mmc_host *host, u32 state) +{ + mmc_claim_host(host); + mmc_deselect_cards(host); + mmc_power_off(host); + mmc_release_host(host); + + return 0; +} + +EXPORT_SYMBOL(mmc_suspend_host); + +/** + * mmc_resume_host - resume a previously suspended host + * @host: mmc host + */ +int mmc_resume_host(struct mmc_host *host) +{ + mmc_detect_change(host); + + return 0; +} + +EXPORT_SYMBOL(mmc_resume_host); + +#endif + +MODULE_LICENSE("GPL"); diff --git a/drivers/mmc/mmc.h b/drivers/mmc/mmc.h new file mode 100644 index 00000000000..b498dffe0b1 --- /dev/null +++ b/drivers/mmc/mmc.h @@ -0,0 +1,16 @@ +/* + * linux/drivers/mmc/mmc.h + * + * Copyright (C) 2003 Russell King, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef _MMC_H +#define _MMC_H +/* core-internal functions */ +void mmc_init_card(struct mmc_card *card, struct mmc_host *host); +int mmc_register_card(struct mmc_card *card); +void mmc_remove_card(struct mmc_card *card); +#endif diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c new file mode 100644 index 00000000000..b5b4a7b1190 --- /dev/null +++ b/drivers/mmc/mmc_block.c @@ -0,0 +1,509 @@ +/* + * Block driver for media (i.e., flash cards) + * + * Copyright 2002 Hewlett-Packard Company + * + * Use consistent with the GNU GPL is permitted, + * provided that this copyright notice is + * preserved in its entirety in all copies and derived works. + * + * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED, + * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS + * FITNESS FOR ANY PARTICULAR PURPOSE. + * + * Many thanks to Alessandro Rubini and Jonathan Corbet! + * + * Author: Andrew Christian + * 28 May 2002 + */ +#include <linux/moduleparam.h> +#include <linux/module.h> +#include <linux/init.h> + +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/errno.h> +#include <linux/hdreg.h> +#include <linux/kdev_t.h> +#include <linux/blkdev.h> +#include <linux/devfs_fs_kernel.h> + +#include <linux/mmc/card.h> +#include <linux/mmc/protocol.h> + +#include <asm/system.h> +#include <asm/uaccess.h> + +#include "mmc_queue.h" + +/* + * max 8 partitions per card + */ +#define MMC_SHIFT 3 + +static int major; + +/* + * There is one mmc_blk_data per slot. + */ +struct mmc_blk_data { + spinlock_t lock; + struct gendisk *disk; + struct mmc_queue queue; + + unsigned int usage; + unsigned int block_bits; +}; + +static DECLARE_MUTEX(open_lock); + +static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) +{ + struct mmc_blk_data *md; + + down(&open_lock); + md = disk->private_data; + if (md && md->usage == 0) + md = NULL; + if (md) + md->usage++; + up(&open_lock); + + return md; +} + +static void mmc_blk_put(struct mmc_blk_data *md) +{ + down(&open_lock); + md->usage--; + if (md->usage == 0) { + put_disk(md->disk); + mmc_cleanup_queue(&md->queue); + kfree(md); + } + up(&open_lock); +} + +static int mmc_blk_open(struct inode *inode, struct file *filp) +{ + struct mmc_blk_data *md; + int ret = -ENXIO; + + md = mmc_blk_get(inode->i_bdev->bd_disk); + if (md) { + if (md->usage == 2) + check_disk_change(inode->i_bdev); + ret = 0; + } + + return ret; +} + +static int mmc_blk_release(struct inode *inode, struct file *filp) +{ + struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data; + + mmc_blk_put(md); + return 0; +} + +static int +mmc_blk_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct block_device *bdev = inode->i_bdev; + + if (cmd == HDIO_GETGEO) { + struct hd_geometry geo; + + memset(&geo, 0, sizeof(struct hd_geometry)); + + geo.cylinders = get_capacity(bdev->bd_disk) / (4 * 16); + geo.heads = 4; + geo.sectors = 16; + geo.start = get_start_sect(bdev); + + return copy_to_user((void __user *)arg, &geo, sizeof(geo)) + ? -EFAULT : 0; + } + + return -ENOTTY; +} + +static struct block_device_operations mmc_bdops = { + .open = mmc_blk_open, + .release = mmc_blk_release, + .ioctl = mmc_blk_ioctl, + .owner = THIS_MODULE, +}; + +struct mmc_blk_request { + struct mmc_request mrq; + struct mmc_command cmd; + struct mmc_command stop; + struct mmc_data data; +}; + +static int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req) +{ + struct mmc_blk_data *md = mq->data; + int stat = BLKPREP_OK; + + /* + * If we have no device, we haven't finished initialising. + */ + if (!md || !mq->card) { + printk(KERN_ERR "%s: killing request - no device/host\n", + req->rq_disk->disk_name); + stat = BLKPREP_KILL; + } + + return stat; +} + +static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) +{ + struct mmc_blk_data *md = mq->data; + struct mmc_card *card = md->queue.card; + int ret; + + if (mmc_card_claim_host(card)) + goto cmd_err; + + do { + struct mmc_blk_request brq; + struct mmc_command cmd; + + memset(&brq, 0, sizeof(struct mmc_blk_request)); + brq.mrq.cmd = &brq.cmd; + brq.mrq.data = &brq.data; + + brq.cmd.arg = req->sector << 9; + brq.cmd.flags = MMC_RSP_R1; + brq.data.timeout_ns = card->csd.tacc_ns * 10; + brq.data.timeout_clks = card->csd.tacc_clks * 10; + brq.data.blksz_bits = md->block_bits; + brq.data.blocks = req->nr_sectors >> (md->block_bits - 9); + brq.stop.opcode = MMC_STOP_TRANSMISSION; + brq.stop.arg = 0; + brq.stop.flags = MMC_RSP_R1B; + + if (rq_data_dir(req) == READ) { + brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK; + brq.data.flags |= MMC_DATA_READ; + } else { + brq.cmd.opcode = MMC_WRITE_BLOCK; + brq.cmd.flags = MMC_RSP_R1B; + brq.data.flags |= MMC_DATA_WRITE; + brq.data.blocks = 1; + } + brq.mrq.stop = brq.data.blocks > 1 ? &brq.stop : NULL; + + brq.data.sg = mq->sg; + brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg); + + mmc_wait_for_req(card->host, &brq.mrq); + if (brq.cmd.error) { + printk(KERN_ERR "%s: error %d sending read/write command\n", + req->rq_disk->disk_name, brq.cmd.error); + goto cmd_err; + } + + if (brq.data.error) { + printk(KERN_ERR "%s: error %d transferring data\n", + req->rq_disk->disk_name, brq.data.error); + goto cmd_err; + } + + if (brq.stop.error) { + printk(KERN_ERR "%s: error %d sending stop command\n", + req->rq_disk->disk_name, brq.stop.error); + goto cmd_err; + } + + do { + int err; + + cmd.opcode = MMC_SEND_STATUS; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1; + err = mmc_wait_for_cmd(card->host, &cmd, 5); + if (err) { + printk(KERN_ERR "%s: error %d requesting status\n", + req->rq_disk->disk_name, err); + goto cmd_err; + } + } while (!(cmd.resp[0] & R1_READY_FOR_DATA)); + +#if 0 + if (cmd.resp[0] & ~0x00000900) + printk(KERN_ERR "%s: status = %08x\n", + req->rq_disk->disk_name, cmd.resp[0]); + if (mmc_decode_status(cmd.resp)) + goto cmd_err; +#endif + + /* + * A block was successfully transferred. + */ + spin_lock_irq(&md->lock); + ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered); + if (!ret) { + /* + * The whole request completed successfully. + */ + add_disk_randomness(req->rq_disk); + blkdev_dequeue_request(req); + end_that_request_last(req); + } + spin_unlock_irq(&md->lock); + } while (ret); + + mmc_card_release_host(card); + + return 1; + + cmd_err: + mmc_card_release_host(card); + + /* + * This is a little draconian, but until we get proper + * error handling sorted out here, its the best we can + * do - especially as some hosts have no idea how much + * data was transferred before the error occurred. + */ + spin_lock_irq(&md->lock); + do { + ret = end_that_request_chunk(req, 0, + req->current_nr_sectors << 9); + } while (ret); + + add_disk_randomness(req->rq_disk); + blkdev_dequeue_request(req); + end_that_request_last(req); + spin_unlock_irq(&md->lock); + + return 0; +} + +#define MMC_NUM_MINORS (256 >> MMC_SHIFT) + +static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))]; + +static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) +{ + struct mmc_blk_data *md; + int devidx, ret; + + devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); + if (devidx >= MMC_NUM_MINORS) + return ERR_PTR(-ENOSPC); + __set_bit(devidx, dev_use); + + md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); + if (md) { + memset(md, 0, sizeof(struct mmc_blk_data)); + + md->disk = alloc_disk(1 << MMC_SHIFT); + if (md->disk == NULL) { + kfree(md); + md = ERR_PTR(-ENOMEM); + goto out; + } + + spin_lock_init(&md->lock); + md->usage = 1; + + ret = mmc_init_queue(&md->queue, card, &md->lock); + if (ret) { + put_disk(md->disk); + kfree(md); + md = ERR_PTR(ret); + goto out; + } + md->queue.prep_fn = mmc_blk_prep_rq; + md->queue.issue_fn = mmc_blk_issue_rq; + md->queue.data = md; + + md->disk->major = major; + md->disk->first_minor = devidx << MMC_SHIFT; + md->disk->fops = &mmc_bdops; + md->disk->private_data = md; + md->disk->queue = md->queue.queue; + md->disk->driverfs_dev = &card->dev; + + /* + * As discussed on lkml, GENHD_FL_REMOVABLE should: + * + * - be set for removable media with permanent block devices + * - be unset for removable block devices with permanent media + * + * Since MMC block devices clearly fall under the second + * case, we do not set GENHD_FL_REMOVABLE. Userspace + * should use the block device creation/destruction hotplug + * messages to tell when the card is present. + */ + + sprintf(md->disk->disk_name, "mmcblk%d", devidx); + sprintf(md->disk->devfs_name, "mmc/blk%d", devidx); + + md->block_bits = card->csd.read_blkbits; + + blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits); + set_capacity(md->disk, card->csd.capacity); + } + out: + return md; +} + +static int +mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) +{ + struct mmc_command cmd; + int err; + + mmc_card_claim_host(card); + cmd.opcode = MMC_SET_BLOCKLEN; + cmd.arg = 1 << card->csd.read_blkbits; + cmd.flags = MMC_RSP_R1; + err = mmc_wait_for_cmd(card->host, &cmd, 5); + mmc_card_release_host(card); + + if (err) { + printk(KERN_ERR "%s: unable to set block size to %d: %d\n", + md->disk->disk_name, cmd.arg, err); + return -EINVAL; + } + + return 0; +} + +static int mmc_blk_probe(struct mmc_card *card) +{ + struct mmc_blk_data *md; + int err; + + if (card->csd.cmdclass & ~0x1ff) + return -ENODEV; + + if (card->csd.read_blkbits < 9) { + printk(KERN_WARNING "%s: read blocksize too small (%u)\n", + mmc_card_id(card), 1 << card->csd.read_blkbits); + return -ENODEV; + } + + md = mmc_blk_alloc(card); + if (IS_ERR(md)) + return PTR_ERR(md); + + err = mmc_blk_set_blksize(md, card); + if (err) + goto out; + + printk(KERN_INFO "%s: %s %s %dKiB\n", + md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), + (card->csd.capacity << card->csd.read_blkbits) / 1024); + + mmc_set_drvdata(card, md); + add_disk(md->disk); + return 0; + + out: + mmc_blk_put(md); + + return err; +} + +static void mmc_blk_remove(struct mmc_card *card) +{ + struct mmc_blk_data *md = mmc_get_drvdata(card); + + if (md) { + int devidx; + + del_gendisk(md->disk); + + /* + * I think this is needed. + */ + md->disk->queue = NULL; + + devidx = md->disk->first_minor >> MMC_SHIFT; + __clear_bit(devidx, dev_use); + + mmc_blk_put(md); + } + mmc_set_drvdata(card, NULL); +} + +#ifdef CONFIG_PM +static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) +{ + struct mmc_blk_data *md = mmc_get_drvdata(card); + + if (md) { + mmc_queue_suspend(&md->queue); + } + return 0; +} + +static int mmc_blk_resume(struct mmc_card *card) +{ + struct mmc_blk_data *md = mmc_get_drvdata(card); + + if (md) { + mmc_blk_set_blksize(md, card); + mmc_queue_resume(&md->queue); + } + return 0; +} +#else +#define mmc_blk_suspend NULL +#define mmc_blk_resume NULL +#endif + +static struct mmc_driver mmc_driver = { + .drv = { + .name = "mmcblk", + }, + .probe = mmc_blk_probe, + .remove = mmc_blk_remove, + .suspend = mmc_blk_suspend, + .resume = mmc_blk_resume, +}; + +static int __init mmc_blk_init(void) +{ + int res = -ENOMEM; + + res = register_blkdev(major, "mmc"); + if (res < 0) { + printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n", + major, res); + goto out; + } + if (major == 0) + major = res; + + devfs_mk_dir("mmc"); + return mmc_register_driver(&mmc_driver); + + out: + return res; +} + +static void __exit mmc_blk_exit(void) +{ + mmc_unregister_driver(&mmc_driver); + devfs_remove("mmc"); + unregister_blkdev(major, "mmc"); +} + +module_init(mmc_blk_init); +module_exit(mmc_blk_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); + +module_param(major, int, 0444); +MODULE_PARM_DESC(major, "specify the major device number for MMC block driver"); diff --git a/drivers/mmc/mmc_queue.c b/drivers/mmc/mmc_queue.c new file mode 100644 index 00000000000..0b9682e9a35 --- /dev/null +++ b/drivers/mmc/mmc_queue.c @@ -0,0 +1,238 @@ +/* + * linux/drivers/mmc/mmc_queue.c + * + * Copyright (C) 2003 Russell King, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ +#include <linux/module.h> +#include <linux/blkdev.h> + +#include <linux/mmc/card.h> +#include <linux/mmc/host.h> +#include "mmc_queue.h" + +#define MMC_QUEUE_EXIT (1 << 0) +#define MMC_QUEUE_SUSPENDED (1 << 1) + +/* + * Prepare a MMC request. Essentially, this means passing the + * preparation off to the media driver. The media driver will + * create a mmc_io_request in req->special. + */ +static int mmc_prep_request(struct request_queue *q, struct request *req) +{ + struct mmc_queue *mq = q->queuedata; + int ret = BLKPREP_KILL; + + if (req->flags & REQ_SPECIAL) { + /* + * Special commands already have the command + * blocks already setup in req->special. + */ + BUG_ON(!req->special); + + ret = BLKPREP_OK; + } else if (req->flags & (REQ_CMD | REQ_BLOCK_PC)) { + /* + * Block I/O requests need translating according + * to the protocol. + */ + ret = mq->prep_fn(mq, req); + } else { + /* + * Everything else is invalid. + */ + blk_dump_rq_flags(req, "MMC bad request"); + } + + if (ret == BLKPREP_OK) + req->flags |= REQ_DONTPREP; + + return ret; +} + +static int mmc_queue_thread(void *d) +{ + struct mmc_queue *mq = d; + struct request_queue *q = mq->queue; + DECLARE_WAITQUEUE(wait, current); + + /* + * Set iothread to ensure that we aren't put to sleep by + * the process freezing. We handle suspension ourselves. + */ + current->flags |= PF_MEMALLOC|PF_NOFREEZE; + + daemonize("mmcqd"); + + complete(&mq->thread_complete); + + down(&mq->thread_sem); + add_wait_queue(&mq->thread_wq, &wait); + do { + struct request *req = NULL; + + spin_lock_irq(q->queue_lock); + set_current_state(TASK_INTERRUPTIBLE); + if (!blk_queue_plugged(q)) + mq->req = req = elv_next_request(q); + spin_unlock_irq(q->queue_lock); + + if (!req) { + if (mq->flags & MMC_QUEUE_EXIT) + break; + up(&mq->thread_sem); + schedule(); + down(&mq->thread_sem); + continue; + } + set_current_state(TASK_RUNNING); + + mq->issue_fn(mq, req); + } while (1); + remove_wait_queue(&mq->thread_wq, &wait); + up(&mq->thread_sem); + + complete_and_exit(&mq->thread_complete, 0); + return 0; +} + +/* + * Generic MMC request handler. This is called for any queue on a + * particular host. When the host is not busy, we look for a request + * on any queue on this host, and attempt to issue it. This may + * not be the queue we were asked to process. + */ +static void mmc_request(request_queue_t *q) +{ + struct mmc_queue *mq = q->queuedata; + + if (!mq->req) + wake_up(&mq->thread_wq); +} + +/** + * mmc_init_queue - initialise a queue structure. + * @mq: mmc queue + * @card: mmc card to attach this queue + * @lock: queue lock + * + * Initialise a MMC card request queue. + */ +int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock) +{ + struct mmc_host *host = card->host; + u64 limit = BLK_BOUNCE_HIGH; + int ret; + + if (host->dev->dma_mask && *host->dev->dma_mask) + limit = *host->dev->dma_mask; + + mq->card = card; + mq->queue = blk_init_queue(mmc_request, lock); + if (!mq->queue) + return -ENOMEM; + + blk_queue_prep_rq(mq->queue, mmc_prep_request); + blk_queue_bounce_limit(mq->queue, limit); + blk_queue_max_sectors(mq->queue, host->max_sectors); + blk_queue_max_phys_segments(mq->queue, host->max_phys_segs); + blk_queue_max_hw_segments(mq->queue, host->max_hw_segs); + blk_queue_max_segment_size(mq->queue, host->max_seg_size); + + mq->queue->queuedata = mq; + mq->req = NULL; + + mq->sg = kmalloc(sizeof(struct scatterlist) * host->max_phys_segs, + GFP_KERNEL); + if (!mq->sg) { + ret = -ENOMEM; + goto cleanup; + } + + init_completion(&mq->thread_complete); + init_waitqueue_head(&mq->thread_wq); + init_MUTEX(&mq->thread_sem); + + ret = kernel_thread(mmc_queue_thread, mq, CLONE_KERNEL); + if (ret >= 0) { + wait_for_completion(&mq->thread_complete); + init_completion(&mq->thread_complete); + ret = 0; + goto out; + } + + cleanup: + kfree(mq->sg); + mq->sg = NULL; + + blk_cleanup_queue(mq->queue); + out: + return ret; +} +EXPORT_SYMBOL(mmc_init_queue); + +void mmc_cleanup_queue(struct mmc_queue *mq) +{ + mq->flags |= MMC_QUEUE_EXIT; + wake_up(&mq->thread_wq); + wait_for_completion(&mq->thread_complete); + + kfree(mq->sg); + mq->sg = NULL; + + blk_cleanup_queue(mq->queue); + + mq->card = NULL; +} +EXPORT_SYMBOL(mmc_cleanup_queue); + +/** + * mmc_queue_suspend - suspend a MMC request queue + * @mq: MMC queue to suspend + * + * Stop the block request queue, and wait for our thread to + * complete any outstanding requests. This ensures that we + * won't suspend while a request is being processed. + */ +void mmc_queue_suspend(struct mmc_queue *mq) +{ + request_queue_t *q = mq->queue; + unsigned long flags; + + if (!(mq->flags & MMC_QUEUE_SUSPENDED)) { + mq->flags |= MMC_QUEUE_SUSPENDED; + + spin_lock_irqsave(q->queue_lock, flags); + blk_stop_queue(q); + spin_unlock_irqrestore(q->queue_lock, flags); + + down(&mq->thread_sem); + } +} +EXPORT_SYMBOL(mmc_queue_suspend); + +/** + * mmc_queue_resume - resume a previously suspended MMC request queue + * @mq: MMC queue to resume + */ +void mmc_queue_resume(struct mmc_queue *mq) +{ + request_queue_t *q = mq->queue; + unsigned long flags; + + if (mq->flags & MMC_QUEUE_SUSPENDED) { + mq->flags &= ~MMC_QUEUE_SUSPENDED; + + up(&mq->thread_sem); + + spin_lock_irqsave(q->queue_lock, flags); + blk_start_queue(q); + spin_unlock_irqrestore(q->queue_lock, flags); + } +} +EXPORT_SYMBOL(mmc_queue_resume); diff --git a/drivers/mmc/mmc_queue.h b/drivers/mmc/mmc_queue.h new file mode 100644 index 00000000000..7182d2f69b4 --- /dev/null +++ b/drivers/mmc/mmc_queue.h @@ -0,0 +1,33 @@ +#ifndef MMC_QUEUE_H +#define MMC_QUEUE_H + +struct request; +struct task_struct; + +struct mmc_queue { + struct mmc_card *card; + struct completion thread_complete; + wait_queue_head_t thread_wq; + struct semaphore thread_sem; + unsigned int flags; + struct request *req; + int (*prep_fn)(struct mmc_queue *, struct request *); + int (*issue_fn)(struct mmc_queue *, struct request *); + void *data; + struct request_queue *queue; + struct scatterlist *sg; +}; + +struct mmc_io_request { + struct request *rq; + int num; + struct mmc_command selcmd; /* mmc_queue private */ + struct mmc_command cmd[4]; /* max 4 commands */ +}; + +extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *); +extern void mmc_cleanup_queue(struct mmc_queue *); +extern void mmc_queue_suspend(struct mmc_queue *); +extern void mmc_queue_resume(struct mmc_queue *); + +#endif diff --git a/drivers/mmc/mmc_sysfs.c b/drivers/mmc/mmc_sysfs.c new file mode 100644 index 00000000000..29a56e9cd5b --- /dev/null +++ b/drivers/mmc/mmc_sysfs.c @@ -0,0 +1,238 @@ +/* + * linux/drivers/mmc/mmc_sysfs.c + * + * Copyright (C) 2003 Russell King, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * MMC sysfs/driver model support. + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/device.h> + +#include <linux/mmc/card.h> +#include <linux/mmc/host.h> + +#include "mmc.h" + +#define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev) +#define to_mmc_driver(d) container_of(d, struct mmc_driver, drv) + +#define MMC_ATTR(name, fmt, args...) \ +static ssize_t mmc_##name##_show (struct device *dev, char *buf) \ +{ \ + struct mmc_card *card = dev_to_mmc_card(dev); \ + return sprintf(buf, fmt, args); \ +} + +MMC_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], + card->raw_cid[2], card->raw_cid[3]); +MMC_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], + card->raw_csd[2], card->raw_csd[3]); +MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); +MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev); +MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev); +MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid); +MMC_ATTR(name, "%s\n", card->cid.prod_name); +MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid); +MMC_ATTR(serial, "0x%08x\n", card->cid.serial); + +#define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL) + +static struct device_attribute mmc_dev_attrs[] = { + MMC_ATTR_RO(cid), + MMC_ATTR_RO(csd), + MMC_ATTR_RO(date), + MMC_ATTR_RO(fwrev), + MMC_ATTR_RO(hwrev), + MMC_ATTR_RO(manfid), + MMC_ATTR_RO(name), + MMC_ATTR_RO(oemid), + MMC_ATTR_RO(serial), + __ATTR_NULL +}; + + +static void mmc_release_card(struct device *dev) +{ + struct mmc_card *card = dev_to_mmc_card(dev); + + kfree(card); +} + +/* + * This currently matches any MMC driver to any MMC card - drivers + * themselves make the decision whether to drive this card in their + * probe method. However, we force "bad" cards to fail. + */ +static int mmc_bus_match(struct device *dev, struct device_driver *drv) +{ + struct mmc_card *card = dev_to_mmc_card(dev); + return !mmc_card_bad(card); +} + +static int +mmc_bus_hotplug(struct device *dev, char **envp, int num_envp, char *buf, + int buf_size) +{ + struct mmc_card *card = dev_to_mmc_card(dev); + char ccc[13]; + int i = 0; + +#define add_env(fmt,val) \ + ({ \ + int len, ret = -ENOMEM; \ + if (i < num_envp) { \ + envp[i++] = buf; \ + len = snprintf(buf, buf_size, fmt, val) + 1; \ + buf_size -= len; \ + buf += len; \ + if (buf_size >= 0) \ + ret = 0; \ + } \ + ret; \ + }) + + for (i = 0; i < 12; i++) + ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0'; + ccc[12] = '\0'; + + i = 0; + add_env("MMC_CCC=%s", ccc); + add_env("MMC_MANFID=%06x", card->cid.manfid); + add_env("MMC_NAME=%s", mmc_card_name(card)); + add_env("MMC_OEMID=%04x", card->cid.oemid); + + return 0; +} + +static int mmc_bus_suspend(struct device *dev, pm_message_t state) +{ + struct mmc_driver *drv = to_mmc_driver(dev->driver); + struct mmc_card *card = dev_to_mmc_card(dev); + int ret = 0; + + if (dev->driver && drv->suspend) + ret = drv->suspend(card, state); + return ret; +} + +static int mmc_bus_resume(struct device *dev) +{ + struct mmc_driver *drv = to_mmc_driver(dev->driver); + struct mmc_card *card = dev_to_mmc_card(dev); + int ret = 0; + + if (dev->driver && drv->resume) + ret = drv->resume(card); + return ret; +} + +static struct bus_type mmc_bus_type = { + .name = "mmc", + .dev_attrs = mmc_dev_attrs, + .match = mmc_bus_match, + .hotplug = mmc_bus_hotplug, + .suspend = mmc_bus_suspend, + .resume = mmc_bus_resume, +}; + + +static int mmc_drv_probe(struct device *dev) +{ + struct mmc_driver *drv = to_mmc_driver(dev->driver); + struct mmc_card *card = dev_to_mmc_card(dev); + + return drv->probe(card); +} + +static int mmc_drv_remove(struct device *dev) +{ + struct mmc_driver *drv = to_mmc_driver(dev->driver); + struct mmc_card *card = dev_to_mmc_card(dev); + + drv->remove(card); + + return 0; +} + + +/** + * mmc_register_driver - register a media driver + * @drv: MMC media driver + */ +int mmc_register_driver(struct mmc_driver *drv) +{ + drv->drv.bus = &mmc_bus_type; + drv->drv.probe = mmc_drv_probe; + drv->drv.remove = mmc_drv_remove; + return driver_register(&drv->drv); +} + +EXPORT_SYMBOL(mmc_register_driver); + +/** + * mmc_unregister_driver - unregister a media driver + * @drv: MMC media driver + */ +void mmc_unregister_driver(struct mmc_driver *drv) +{ + drv->drv.bus = &mmc_bus_type; + driver_unregister(&drv->drv); +} + +EXPORT_SYMBOL(mmc_unregister_driver); + + +/* + * Internal function. Initialise a MMC card structure. + */ +void mmc_init_card(struct mmc_card *card, struct mmc_host *host) +{ + memset(card, 0, sizeof(struct mmc_card)); + card->host = host; + device_initialize(&card->dev); + card->dev.parent = card->host->dev; + card->dev.bus = &mmc_bus_type; + card->dev.release = mmc_release_card; +} + +/* + * Internal function. Register a new MMC card with the driver model. + */ +int mmc_register_card(struct mmc_card *card) +{ + snprintf(card->dev.bus_id, sizeof(card->dev.bus_id), + "%s:%04x", card->host->host_name, card->rca); + + return device_add(&card->dev); +} + +/* + * Internal function. Unregister a new MMC card with the + * driver model, and (eventually) free it. + */ +void mmc_remove_card(struct mmc_card *card) +{ + if (mmc_card_present(card)) + device_del(&card->dev); + + put_device(&card->dev); +} + + +static int __init mmc_init(void) +{ + return bus_register(&mmc_bus_type); +} + +static void __exit mmc_exit(void) +{ + bus_unregister(&mmc_bus_type); +} + +module_init(mmc_init); +module_exit(mmc_exit); diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c new file mode 100644 index 00000000000..3ee961c206b --- /dev/null +++ b/drivers/mmc/mmci.c @@ -0,0 +1,680 @@ +/* + * linux/drivers/mmc/mmci.c - ARM PrimeCell MMCI PL180/1 driver + * + * Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/highmem.h> +#include <linux/mmc/host.h> +#include <linux/mmc/protocol.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/scatterlist.h> +#include <asm/hardware/amba.h> +#include <asm/hardware/clock.h> +#include <asm/mach/mmc.h> + +#include "mmci.h" + +#define DRIVER_NAME "mmci-pl18x" + +#ifdef CONFIG_MMC_DEBUG +#define DBG(host,fmt,args...) \ + pr_debug("%s: %s: " fmt, host->mmc->host_name, __func__ , args) +#else +#define DBG(host,fmt,args...) do { } while (0) +#endif + +static unsigned int fmax = 515633; + +static void +mmci_request_end(struct mmci_host *host, struct mmc_request *mrq) +{ + writel(0, host->base + MMCICOMMAND); + + host->mrq = NULL; + host->cmd = NULL; + + if (mrq->data) + mrq->data->bytes_xfered = host->data_xfered; + + /* + * Need to drop the host lock here; mmc_request_done may call + * back into the driver... + */ + spin_unlock(&host->lock); + mmc_request_done(host->mmc, mrq); + spin_lock(&host->lock); +} + +static void mmci_stop_data(struct mmci_host *host) +{ + writel(0, host->base + MMCIDATACTRL); + writel(0, host->base + MMCIMASK1); + host->data = NULL; +} + +static void mmci_start_data(struct mmci_host *host, struct mmc_data *data) +{ + unsigned int datactrl, timeout, irqmask; + void __iomem *base; + + DBG(host, "blksz %04x blks %04x flags %08x\n", + 1 << data->blksz_bits, data->blocks, data->flags); + + host->data = data; + host->size = data->blocks << data->blksz_bits; + host->data_xfered = 0; + + mmci_init_sg(host, data); + + timeout = data->timeout_clks + + ((unsigned long long)data->timeout_ns * host->cclk) / + 1000000000ULL; + + base = host->base; + writel(timeout, base + MMCIDATATIMER); + writel(host->size, base + MMCIDATALENGTH); + + datactrl = MCI_DPSM_ENABLE | data->blksz_bits << 4; + if (data->flags & MMC_DATA_READ) { + datactrl |= MCI_DPSM_DIRECTION; + irqmask = MCI_RXFIFOHALFFULLMASK; + } else { + /* + * We don't actually need to include "FIFO empty" here + * since its implicit in "FIFO half empty". + */ + irqmask = MCI_TXFIFOHALFEMPTYMASK; + } + + writel(datactrl, base + MMCIDATACTRL); + writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0); + writel(irqmask, base + MMCIMASK1); +} + +static void +mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c) +{ + void __iomem *base = host->base; + + DBG(host, "op %02x arg %08x flags %08x\n", + cmd->opcode, cmd->arg, cmd->flags); + + if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) { + writel(0, base + MMCICOMMAND); + udelay(1); + } + + c |= cmd->opcode | MCI_CPSM_ENABLE; + switch (cmd->flags & MMC_RSP_MASK) { + case MMC_RSP_NONE: + default: + break; + case MMC_RSP_LONG: + c |= MCI_CPSM_LONGRSP; + case MMC_RSP_SHORT: + c |= MCI_CPSM_RESPONSE; + break; + } + if (/*interrupt*/0) + c |= MCI_CPSM_INTERRUPT; + + host->cmd = cmd; + + writel(cmd->arg, base + MMCIARGUMENT); + writel(c, base + MMCICOMMAND); +} + +static void +mmci_data_irq(struct mmci_host *host, struct mmc_data *data, + unsigned int status) +{ + if (status & MCI_DATABLOCKEND) { + host->data_xfered += 1 << data->blksz_bits; + } + if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) { + if (status & MCI_DATACRCFAIL) + data->error = MMC_ERR_BADCRC; + else if (status & MCI_DATATIMEOUT) + data->error = MMC_ERR_TIMEOUT; + else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN)) + data->error = MMC_ERR_FIFO; + status |= MCI_DATAEND; + } + if (status & MCI_DATAEND) { + mmci_stop_data(host); + + if (!data->stop) { + mmci_request_end(host, data->mrq); + } else { + mmci_start_command(host, data->stop, 0); + } + } +} + +static void +mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd, + unsigned int status) +{ + void __iomem *base = host->base; + + host->cmd = NULL; + + cmd->resp[0] = readl(base + MMCIRESPONSE0); + cmd->resp[1] = readl(base + MMCIRESPONSE1); + cmd->resp[2] = readl(base + MMCIRESPONSE2); + cmd->resp[3] = readl(base + MMCIRESPONSE3); + + if (status & MCI_CMDTIMEOUT) { + cmd->error = MMC_ERR_TIMEOUT; + } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) { + cmd->error = MMC_ERR_BADCRC; + } + + if (!cmd->data || cmd->error != MMC_ERR_NONE) { + mmci_request_end(host, cmd->mrq); + } else if (!(cmd->data->flags & MMC_DATA_READ)) { + mmci_start_data(host, cmd->data); + } +} + +static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain) +{ + void __iomem *base = host->base; + char *ptr = buffer; + u32 status; + + do { + int count = host->size - (readl(base + MMCIFIFOCNT) << 2); + + if (count > remain) + count = remain; + + if (count <= 0) + break; + + readsl(base + MMCIFIFO, ptr, count >> 2); + + ptr += count; + remain -= count; + + if (remain == 0) + break; + + status = readl(base + MMCISTATUS); + } while (status & MCI_RXDATAAVLBL); + + return ptr - buffer; +} + +static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status) +{ + void __iomem *base = host->base; + char *ptr = buffer; + + do { + unsigned int count, maxcnt; + + maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE; + count = min(remain, maxcnt); + + writesl(base + MMCIFIFO, ptr, count >> 2); + + ptr += count; + remain -= count; + + if (remain == 0) + break; + + status = readl(base + MMCISTATUS); + } while (status & MCI_TXFIFOHALFEMPTY); + + return ptr - buffer; +} + +/* + * PIO data transfer IRQ handler. + */ +static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs) +{ + struct mmci_host *host = dev_id; + void __iomem *base = host->base; + u32 status; + + status = readl(base + MMCISTATUS); + + DBG(host, "irq1 %08x\n", status); + + do { + unsigned long flags; + unsigned int remain, len; + char *buffer; + + /* + * For write, we only need to test the half-empty flag + * here - if the FIFO is completely empty, then by + * definition it is more than half empty. + * + * For read, check for data available. + */ + if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL))) + break; + + /* + * Map the current scatter buffer. + */ + buffer = mmci_kmap_atomic(host, &flags) + host->sg_off; + remain = host->sg_ptr->length - host->sg_off; + + len = 0; + if (status & MCI_RXACTIVE) + len = mmci_pio_read(host, buffer, remain); + if (status & MCI_TXACTIVE) + len = mmci_pio_write(host, buffer, remain, status); + + /* + * Unmap the buffer. + */ + mmci_kunmap_atomic(host, &flags); + + host->sg_off += len; + host->size -= len; + remain -= len; + + if (remain) + break; + + if (!mmci_next_sg(host)) + break; + + status = readl(base + MMCISTATUS); + } while (1); + + /* + * If we're nearing the end of the read, switch to + * "any data available" mode. + */ + if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE) + writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1); + + /* + * If we run out of data, disable the data IRQs; this + * prevents a race where the FIFO becomes empty before + * the chip itself has disabled the data path, and + * stops us racing with our data end IRQ. + */ + if (host->size == 0) { + writel(0, base + MMCIMASK1); + writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0); + } + + return IRQ_HANDLED; +} + +/* + * Handle completion of command and data transfers. + */ +static irqreturn_t mmci_irq(int irq, void *dev_id, struct pt_regs *regs) +{ + struct mmci_host *host = dev_id; + u32 status; + int ret = 0; + + spin_lock(&host->lock); + + do { + struct mmc_command *cmd; + struct mmc_data *data; + + status = readl(host->base + MMCISTATUS); + status &= readl(host->base + MMCIMASK0); + writel(status, host->base + MMCICLEAR); + + DBG(host, "irq0 %08x\n", status); + + data = host->data; + if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN| + MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data) + mmci_data_irq(host, data, status); + + cmd = host->cmd; + if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd) + mmci_cmd_irq(host, cmd, status); + + ret = 1; + } while (status); + + spin_unlock(&host->lock); + + return IRQ_RETVAL(ret); +} + +static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct mmci_host *host = mmc_priv(mmc); + + WARN_ON(host->mrq != NULL); + + spin_lock_irq(&host->lock); + + host->mrq = mrq; + + if (mrq->data && mrq->data->flags & MMC_DATA_READ) + mmci_start_data(host, mrq->data); + + mmci_start_command(host, mrq->cmd, 0); + + spin_unlock_irq(&host->lock); +} + +static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct mmci_host *host = mmc_priv(mmc); + u32 clk = 0, pwr = 0; + + DBG(host, "clock %uHz busmode %u powermode %u Vdd %u\n", + ios->clock, ios->bus_mode, ios->power_mode, ios->vdd); + + if (ios->clock) { + if (ios->clock >= host->mclk) { + clk = MCI_CLK_BYPASS; + host->cclk = host->mclk; + } else { + clk = host->mclk / (2 * ios->clock) - 1; + if (clk > 256) + clk = 255; + host->cclk = host->mclk / (2 * (clk + 1)); + } + clk |= MCI_CLK_ENABLE; + } + + if (host->plat->translate_vdd) + pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd); + + switch (ios->power_mode) { + case MMC_POWER_OFF: + break; + case MMC_POWER_UP: + pwr |= MCI_PWR_UP; + break; + case MMC_POWER_ON: + pwr |= MCI_PWR_ON; + break; + } + + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) + pwr |= MCI_ROD; + + writel(clk, host->base + MMCICLOCK); + + if (host->pwr != pwr) { + host->pwr = pwr; + writel(pwr, host->base + MMCIPOWER); + } +} + +static struct mmc_host_ops mmci_ops = { + .request = mmci_request, + .set_ios = mmci_set_ios, +}; + +static void mmci_check_status(unsigned long data) +{ + struct mmci_host *host = (struct mmci_host *)data; + unsigned int status; + + status = host->plat->status(mmc_dev(host->mmc)); + if (status ^ host->oldstat) + mmc_detect_change(host->mmc); + + host->oldstat = status; + mod_timer(&host->timer, jiffies + HZ); +} + +static int mmci_probe(struct amba_device *dev, void *id) +{ + struct mmc_platform_data *plat = dev->dev.platform_data; + struct mmci_host *host; + struct mmc_host *mmc; + int ret; + + /* must have platform data */ + if (!plat) { + ret = -EINVAL; + goto out; + } + + ret = amba_request_regions(dev, DRIVER_NAME); + if (ret) + goto out; + + mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev); + if (!mmc) { + ret = -ENOMEM; + goto rel_regions; + } + + host = mmc_priv(mmc); + host->clk = clk_get(&dev->dev, "MCLK"); + if (IS_ERR(host->clk)) { + ret = PTR_ERR(host->clk); + host->clk = NULL; + goto host_free; + } + + ret = clk_use(host->clk); + if (ret) + goto clk_free; + + ret = clk_enable(host->clk); + if (ret) + goto clk_unuse; + + host->plat = plat; + host->mclk = clk_get_rate(host->clk); + host->mmc = mmc; + host->base = ioremap(dev->res.start, SZ_4K); + if (!host->base) { + ret = -ENOMEM; + goto clk_disable; + } + + mmc->ops = &mmci_ops; + mmc->f_min = (host->mclk + 511) / 512; + mmc->f_max = min(host->mclk, fmax); + mmc->ocr_avail = plat->ocr_mask; + + /* + * We can do SGIO + */ + mmc->max_hw_segs = 16; + mmc->max_phys_segs = NR_SG; + + /* + * Since we only have a 16-bit data length register, we must + * ensure that we don't exceed 2^16-1 bytes in a single request. + * Choose 64 (512-byte) sectors as the limit. + */ + mmc->max_sectors = 64; + + /* + * Set the maximum segment size. Since we aren't doing DMA + * (yet) we are only limited by the data length register. + */ + mmc->max_seg_size = mmc->max_sectors << 9; + + spin_lock_init(&host->lock); + + writel(0, host->base + MMCIMASK0); + writel(0, host->base + MMCIMASK1); + writel(0xfff, host->base + MMCICLEAR); + + ret = request_irq(dev->irq[0], mmci_irq, SA_SHIRQ, DRIVER_NAME " (cmd)", host); + if (ret) + goto unmap; + + ret = request_irq(dev->irq[1], mmci_pio_irq, SA_SHIRQ, DRIVER_NAME " (pio)", host); + if (ret) + goto irq0_free; + + writel(MCI_IRQENABLE, host->base + MMCIMASK0); + + amba_set_drvdata(dev, mmc); + + mmc_add_host(mmc); + + printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%08lx irq %d,%d\n", + mmc->host_name, amba_rev(dev), amba_config(dev), + dev->res.start, dev->irq[0], dev->irq[1]); + + init_timer(&host->timer); + host->timer.data = (unsigned long)host; + host->timer.function = mmci_check_status; + host->timer.expires = jiffies + HZ; + add_timer(&host->timer); + + return 0; + + irq0_free: + free_irq(dev->irq[0], host); + unmap: + iounmap(host->base); + clk_disable: + clk_disable(host->clk); + clk_unuse: + clk_unuse(host->clk); + clk_free: + clk_put(host->clk); + host_free: + mmc_free_host(mmc); + rel_regions: + amba_release_regions(dev); + out: + return ret; +} + +static int mmci_remove(struct amba_device *dev) +{ + struct mmc_host *mmc = amba_get_drvdata(dev); + + amba_set_drvdata(dev, NULL); + + if (mmc) { + struct mmci_host *host = mmc_priv(mmc); + + del_timer_sync(&host->timer); + + mmc_remove_host(mmc); + + writel(0, host->base + MMCIMASK0); + writel(0, host->base + MMCIMASK1); + + writel(0, host->base + MMCICOMMAND); + writel(0, host->base + MMCIDATACTRL); + + free_irq(dev->irq[0], host); + free_irq(dev->irq[1], host); + + iounmap(host->base); + clk_disable(host->clk); + clk_unuse(host->clk); + clk_put(host->clk); + + mmc_free_host(mmc); + + amba_release_regions(dev); + } + + return 0; +} + +#ifdef CONFIG_PM +static int mmci_suspend(struct amba_device *dev, u32 state) +{ + struct mmc_host *mmc = amba_get_drvdata(dev); + int ret = 0; + + if (mmc) { + struct mmci_host *host = mmc_priv(mmc); + + ret = mmc_suspend_host(mmc, state); + if (ret == 0) + writel(0, host->base + MMCIMASK0); + } + + return ret; +} + +static int mmci_resume(struct amba_device *dev) +{ + struct mmc_host *mmc = amba_get_drvdata(dev); + int ret = 0; + + if (mmc) { + struct mmci_host *host = mmc_priv(mmc); + + writel(MCI_IRQENABLE, host->base + MMCIMASK0); + + ret = mmc_resume_host(mmc); + } + + return ret; +} +#else +#define mmci_suspend NULL +#define mmci_resume NULL +#endif + +static struct amba_id mmci_ids[] = { + { + .id = 0x00041180, + .mask = 0x000fffff, + }, + { + .id = 0x00041181, + .mask = 0x000fffff, + }, + { 0, 0 }, +}; + +static struct amba_driver mmci_driver = { + .drv = { + .name = DRIVER_NAME, + }, + .probe = mmci_probe, + .remove = mmci_remove, + .suspend = mmci_suspend, + .resume = mmci_resume, + .id_table = mmci_ids, +}; + +static int __init mmci_init(void) +{ + return amba_driver_register(&mmci_driver); +} + +static void __exit mmci_exit(void) +{ + amba_driver_unregister(&mmci_driver); +} + +module_init(mmci_init); +module_exit(mmci_exit); +module_param(fmax, uint, 0444); + +MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/mmc/mmci.h b/drivers/mmc/mmci.h new file mode 100644 index 00000000000..4589bbd6819 --- /dev/null +++ b/drivers/mmc/mmci.h @@ -0,0 +1,179 @@ +/* + * linux/drivers/mmc/mmci.h - ARM PrimeCell MMCI PL180/1 driver + * + * Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#define MMCIPOWER 0x000 +#define MCI_PWR_OFF 0x00 +#define MCI_PWR_UP 0x02 +#define MCI_PWR_ON 0x03 +#define MCI_OD (1 << 6) +#define MCI_ROD (1 << 7) + +#define MMCICLOCK 0x004 +#define MCI_CLK_ENABLE (1 << 8) +#define MCI_CLK_PWRSAVE (1 << 9) +#define MCI_CLK_BYPASS (1 << 10) + +#define MMCIARGUMENT 0x008 +#define MMCICOMMAND 0x00c +#define MCI_CPSM_RESPONSE (1 << 6) +#define MCI_CPSM_LONGRSP (1 << 7) +#define MCI_CPSM_INTERRUPT (1 << 8) +#define MCI_CPSM_PENDING (1 << 9) +#define MCI_CPSM_ENABLE (1 << 10) + +#define MMCIRESPCMD 0x010 +#define MMCIRESPONSE0 0x014 +#define MMCIRESPONSE1 0x018 +#define MMCIRESPONSE2 0x01c +#define MMCIRESPONSE3 0x020 +#define MMCIDATATIMER 0x024 +#define MMCIDATALENGTH 0x028 +#define MMCIDATACTRL 0x02c +#define MCI_DPSM_ENABLE (1 << 0) +#define MCI_DPSM_DIRECTION (1 << 1) +#define MCI_DPSM_MODE (1 << 2) +#define MCI_DPSM_DMAENABLE (1 << 3) + +#define MMCIDATACNT 0x030 +#define MMCISTATUS 0x034 +#define MCI_CMDCRCFAIL (1 << 0) +#define MCI_DATACRCFAIL (1 << 1) +#define MCI_CMDTIMEOUT (1 << 2) +#define MCI_DATATIMEOUT (1 << 3) +#define MCI_TXUNDERRUN (1 << 4) +#define MCI_RXOVERRUN (1 << 5) +#define MCI_CMDRESPEND (1 << 6) +#define MCI_CMDSENT (1 << 7) +#define MCI_DATAEND (1 << 8) +#define MCI_DATABLOCKEND (1 << 10) +#define MCI_CMDACTIVE (1 << 11) +#define MCI_TXACTIVE (1 << 12) +#define MCI_RXACTIVE (1 << 13) +#define MCI_TXFIFOHALFEMPTY (1 << 14) +#define MCI_RXFIFOHALFFULL (1 << 15) +#define MCI_TXFIFOFULL (1 << 16) +#define MCI_RXFIFOFULL (1 << 17) +#define MCI_TXFIFOEMPTY (1 << 18) +#define MCI_RXFIFOEMPTY (1 << 19) +#define MCI_TXDATAAVLBL (1 << 20) +#define MCI_RXDATAAVLBL (1 << 21) + +#define MMCICLEAR 0x038 +#define MCI_CMDCRCFAILCLR (1 << 0) +#define MCI_DATACRCFAILCLR (1 << 1) +#define MCI_CMDTIMEOUTCLR (1 << 2) +#define MCI_DATATIMEOUTCLR (1 << 3) +#define MCI_TXUNDERRUNCLR (1 << 4) +#define MCI_RXOVERRUNCLR (1 << 5) +#define MCI_CMDRESPENDCLR (1 << 6) +#define MCI_CMDSENTCLR (1 << 7) +#define MCI_DATAENDCLR (1 << 8) +#define MCI_DATABLOCKENDCLR (1 << 10) + +#define MMCIMASK0 0x03c +#define MCI_CMDCRCFAILMASK (1 << 0) +#define MCI_DATACRCFAILMASK (1 << 1) +#define MCI_CMDTIMEOUTMASK (1 << 2) +#define MCI_DATATIMEOUTMASK (1 << 3) +#define MCI_TXUNDERRUNMASK (1 << 4) +#define MCI_RXOVERRUNMASK (1 << 5) +#define MCI_CMDRESPENDMASK (1 << 6) +#define MCI_CMDSENTMASK (1 << 7) +#define MCI_DATAENDMASK (1 << 8) +#define MCI_DATABLOCKENDMASK (1 << 10) +#define MCI_CMDACTIVEMASK (1 << 11) +#define MCI_TXACTIVEMASK (1 << 12) +#define MCI_RXACTIVEMASK (1 << 13) +#define MCI_TXFIFOHALFEMPTYMASK (1 << 14) +#define MCI_RXFIFOHALFFULLMASK (1 << 15) +#define MCI_TXFIFOFULLMASK (1 << 16) +#define MCI_RXFIFOFULLMASK (1 << 17) +#define MCI_TXFIFOEMPTYMASK (1 << 18) +#define MCI_RXFIFOEMPTYMASK (1 << 19) +#define MCI_TXDATAAVLBLMASK (1 << 20) +#define MCI_RXDATAAVLBLMASK (1 << 21) + +#define MMCIMASK1 0x040 +#define MMCIFIFOCNT 0x048 +#define MMCIFIFO 0x080 /* to 0x0bc */ + +#define MCI_IRQENABLE \ + (MCI_CMDCRCFAILMASK|MCI_DATACRCFAILMASK|MCI_CMDTIMEOUTMASK| \ + MCI_DATATIMEOUTMASK|MCI_TXUNDERRUNMASK|MCI_RXOVERRUNMASK| \ + MCI_CMDRESPENDMASK|MCI_CMDSENTMASK|MCI_DATABLOCKENDMASK) + +/* + * The size of the FIFO in bytes. + */ +#define MCI_FIFOSIZE (16*4) + +#define MCI_FIFOHALFSIZE (MCI_FIFOSIZE / 2) + +#define NR_SG 16 + +struct clk; + +struct mmci_host { + void __iomem *base; + struct mmc_request *mrq; + struct mmc_command *cmd; + struct mmc_data *data; + struct mmc_host *mmc; + struct clk *clk; + + unsigned int data_xfered; + + spinlock_t lock; + + unsigned int mclk; + unsigned int cclk; + u32 pwr; + struct mmc_platform_data *plat; + + struct timer_list timer; + unsigned int oldstat; + + unsigned int sg_len; + + /* pio stuff */ + struct scatterlist *sg_ptr; + unsigned int sg_off; + unsigned int size; +}; + +static inline void mmci_init_sg(struct mmci_host *host, struct mmc_data *data) +{ + /* + * Ideally, we want the higher levels to pass us a scatter list. + */ + host->sg_len = data->sg_len; + host->sg_ptr = data->sg; + host->sg_off = 0; +} + +static inline int mmci_next_sg(struct mmci_host *host) +{ + host->sg_ptr++; + host->sg_off = 0; + return --host->sg_len; +} + +static inline char *mmci_kmap_atomic(struct mmci_host *host, unsigned long *flags) +{ + struct scatterlist *sg = host->sg_ptr; + + local_irq_save(*flags); + return kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset; +} + +static inline void mmci_kunmap_atomic(struct mmci_host *host, unsigned long *flags) +{ + kunmap_atomic(host->sg_ptr->page, KM_BIO_SRC_IRQ); + local_irq_restore(*flags); +} diff --git a/drivers/mmc/pxamci.c b/drivers/mmc/pxamci.c new file mode 100644 index 00000000000..f76deedf535 --- /dev/null +++ b/drivers/mmc/pxamci.c @@ -0,0 +1,610 @@ +/* + * linux/drivers/mmc/pxa.c - PXA MMCI driver + * + * Copyright (C) 2003 Russell King, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This hardware is really sick: + * - No way to clear interrupts. + * - Have to turn off the clock whenever we touch the device. + * - Doesn't tell you how many data blocks were transferred. + * Yuck! + * + * 1 and 3 byte data transfers not supported + * max block length up to 1023 + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/mmc/host.h> +#include <linux/mmc/protocol.h> + +#include <asm/dma.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/scatterlist.h> +#include <asm/sizes.h> + +#include <asm/arch/pxa-regs.h> +#include <asm/arch/mmc.h> + +#include "pxamci.h" + +#ifdef CONFIG_MMC_DEBUG +#define DBG(x...) printk(KERN_DEBUG x) +#else +#define DBG(x...) do { } while (0) +#endif + +#define DRIVER_NAME "pxa2xx-mci" + +#define NR_SG 1 + +struct pxamci_host { + struct mmc_host *mmc; + spinlock_t lock; + struct resource *res; + void __iomem *base; + int irq; + int dma; + unsigned int clkrt; + unsigned int cmdat; + unsigned int imask; + unsigned int power_mode; + struct pxamci_platform_data *pdata; + + struct mmc_request *mrq; + struct mmc_command *cmd; + struct mmc_data *data; + + dma_addr_t sg_dma; + struct pxa_dma_desc *sg_cpu; + unsigned int dma_len; + + unsigned int dma_dir; +}; + +static inline unsigned int ns_to_clocks(unsigned int ns) +{ + return (ns * (CLOCKRATE / 1000000) + 999) / 1000; +} + +static void pxamci_stop_clock(struct pxamci_host *host) +{ + if (readl(host->base + MMC_STAT) & STAT_CLK_EN) { + unsigned long timeout = 10000; + unsigned int v; + + writel(STOP_CLOCK, host->base + MMC_STRPCL); + + do { + v = readl(host->base + MMC_STAT); + if (!(v & STAT_CLK_EN)) + break; + udelay(1); + } while (timeout--); + + if (v & STAT_CLK_EN) + dev_err(mmc_dev(host->mmc), "unable to stop clock\n"); + } +} + +static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask) +{ + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + host->imask &= ~mask; + writel(host->imask, host->base + MMC_I_MASK); + spin_unlock_irqrestore(&host->lock, flags); +} + +static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask) +{ + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + host->imask |= mask; + writel(host->imask, host->base + MMC_I_MASK); + spin_unlock_irqrestore(&host->lock, flags); +} + +static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data) +{ + unsigned int nob = data->blocks; + unsigned int timeout; + u32 dcmd; + int i; + + host->data = data; + + if (data->flags & MMC_DATA_STREAM) + nob = 0xffff; + + writel(nob, host->base + MMC_NOB); + writel(1 << data->blksz_bits, host->base + MMC_BLKLEN); + + timeout = ns_to_clocks(data->timeout_ns) + data->timeout_clks; + writel((timeout + 255) / 256, host->base + MMC_RDTO); + + if (data->flags & MMC_DATA_READ) { + host->dma_dir = DMA_FROM_DEVICE; + dcmd = DCMD_INCTRGADDR | DCMD_FLOWTRG; + DRCMRTXMMC = 0; + DRCMRRXMMC = host->dma | DRCMR_MAPVLD; + } else { + host->dma_dir = DMA_TO_DEVICE; + dcmd = DCMD_INCSRCADDR | DCMD_FLOWSRC; + DRCMRRXMMC = 0; + DRCMRTXMMC = host->dma | DRCMR_MAPVLD; + } + + dcmd |= DCMD_BURST32 | DCMD_WIDTH1; + + host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, + host->dma_dir); + + for (i = 0; i < host->dma_len; i++) { + if (data->flags & MMC_DATA_READ) { + host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO; + host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]); + } else { + host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]); + host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO; + } + host->sg_cpu[i].dcmd = dcmd | sg_dma_len(&data->sg[i]); + host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) * + sizeof(struct pxa_dma_desc); + } + host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP; + wmb(); + + DDADR(host->dma) = host->sg_dma; + DCSR(host->dma) = DCSR_RUN; +} + +static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat) +{ + WARN_ON(host->cmd != NULL); + host->cmd = cmd; + + if (cmd->flags & MMC_RSP_BUSY) + cmdat |= CMDAT_BUSY; + + switch (cmd->flags & (MMC_RSP_MASK | MMC_RSP_CRC)) { + case MMC_RSP_SHORT | MMC_RSP_CRC: + cmdat |= CMDAT_RESP_SHORT; + break; + case MMC_RSP_SHORT: + cmdat |= CMDAT_RESP_R3; + break; + case MMC_RSP_LONG | MMC_RSP_CRC: + cmdat |= CMDAT_RESP_R2; + break; + default: + break; + } + + writel(cmd->opcode, host->base + MMC_CMD); + writel(cmd->arg >> 16, host->base + MMC_ARGH); + writel(cmd->arg & 0xffff, host->base + MMC_ARGL); + writel(cmdat, host->base + MMC_CMDAT); + writel(host->clkrt, host->base + MMC_CLKRT); + + writel(START_CLOCK, host->base + MMC_STRPCL); + + pxamci_enable_irq(host, END_CMD_RES); +} + +static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq) +{ + DBG("PXAMCI: request done\n"); + host->mrq = NULL; + host->cmd = NULL; + host->data = NULL; + mmc_request_done(host->mmc, mrq); +} + +static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat) +{ + struct mmc_command *cmd = host->cmd; + int i; + u32 v; + + if (!cmd) + return 0; + + host->cmd = NULL; + + /* + * Did I mention this is Sick. We always need to + * discard the upper 8 bits of the first 16-bit word. + */ + v = readl(host->base + MMC_RES) & 0xffff; + for (i = 0; i < 4; i++) { + u32 w1 = readl(host->base + MMC_RES) & 0xffff; + u32 w2 = readl(host->base + MMC_RES) & 0xffff; + cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8; + v = w2; + } + + if (stat & STAT_TIME_OUT_RESPONSE) { + cmd->error = MMC_ERR_TIMEOUT; + } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) { +#ifdef CONFIG_PXA27x + /* + * workaround for erratum #42: + * Intel PXA27x Family Processor Specification Update Rev 001 + */ + if (cmd->opcode == MMC_ALL_SEND_CID || + cmd->opcode == MMC_SEND_CSD || + cmd->opcode == MMC_SEND_CID) { + /* a bogus CRC error can appear if the msb of + the 15 byte response is a one */ + if ((cmd->resp[0] & 0x80000000) == 0) + cmd->error = MMC_ERR_BADCRC; + } else { + DBG("ignoring CRC from command %d - *risky*\n",cmd->opcode); + } +#else + cmd->error = MMC_ERR_BADCRC; +#endif + } + + pxamci_disable_irq(host, END_CMD_RES); + if (host->data && cmd->error == MMC_ERR_NONE) { + pxamci_enable_irq(host, DATA_TRAN_DONE); + } else { + pxamci_finish_request(host, host->mrq); + } + + return 1; +} + +static int pxamci_data_done(struct pxamci_host *host, unsigned int stat) +{ + struct mmc_data *data = host->data; + + if (!data) + return 0; + + DCSR(host->dma) = 0; + dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len, + host->dma_dir); + + if (stat & STAT_READ_TIME_OUT) + data->error = MMC_ERR_TIMEOUT; + else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR)) + data->error = MMC_ERR_BADCRC; + + /* + * There appears to be a hardware design bug here. There seems to + * be no way to find out how much data was transferred to the card. + * This means that if there was an error on any block, we mark all + * data blocks as being in error. + */ + if (data->error == MMC_ERR_NONE) + data->bytes_xfered = data->blocks << data->blksz_bits; + else + data->bytes_xfered = 0; + + pxamci_disable_irq(host, DATA_TRAN_DONE); + + host->data = NULL; + if (host->mrq->stop && data->error == MMC_ERR_NONE) { + pxamci_stop_clock(host); + pxamci_start_cmd(host, host->mrq->stop, 0); + } else { + pxamci_finish_request(host, host->mrq); + } + + return 1; +} + +static irqreturn_t pxamci_irq(int irq, void *devid, struct pt_regs *regs) +{ + struct pxamci_host *host = devid; + unsigned int ireg; + int handled = 0; + + ireg = readl(host->base + MMC_I_REG); + + DBG("PXAMCI: irq %08x\n", ireg); + + if (ireg) { + unsigned stat = readl(host->base + MMC_STAT); + + DBG("PXAMCI: stat %08x\n", stat); + + if (ireg & END_CMD_RES) + handled |= pxamci_cmd_done(host, stat); + if (ireg & DATA_TRAN_DONE) + handled |= pxamci_data_done(host, stat); + } + + return IRQ_RETVAL(handled); +} + +static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct pxamci_host *host = mmc_priv(mmc); + unsigned int cmdat; + + WARN_ON(host->mrq != NULL); + + host->mrq = mrq; + + pxamci_stop_clock(host); + + cmdat = host->cmdat; + host->cmdat &= ~CMDAT_INIT; + + if (mrq->data) { + pxamci_setup_data(host, mrq->data); + + cmdat &= ~CMDAT_BUSY; + cmdat |= CMDAT_DATAEN | CMDAT_DMAEN; + if (mrq->data->flags & MMC_DATA_WRITE) + cmdat |= CMDAT_WRITE; + + if (mrq->data->flags & MMC_DATA_STREAM) + cmdat |= CMDAT_STREAM; + } + + pxamci_start_cmd(host, mrq->cmd, cmdat); +} + +static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct pxamci_host *host = mmc_priv(mmc); + + DBG("pxamci_set_ios: clock %u power %u vdd %u.%02u\n", + ios->clock, ios->power_mode, ios->vdd / 100, + ios->vdd % 100); + + if (ios->clock) { + unsigned int clk = CLOCKRATE / ios->clock; + if (CLOCKRATE / clk > ios->clock) + clk <<= 1; + host->clkrt = fls(clk) - 1; + pxa_set_cken(CKEN12_MMC, 1); + + /* + * we write clkrt on the next command + */ + } else { + pxamci_stop_clock(host); + pxa_set_cken(CKEN12_MMC, 0); + } + + if (host->power_mode != ios->power_mode) { + host->power_mode = ios->power_mode; + + if (host->pdata && host->pdata->setpower) + host->pdata->setpower(mmc->dev, ios->vdd); + + if (ios->power_mode == MMC_POWER_ON) + host->cmdat |= CMDAT_INIT; + } + + DBG("pxamci_set_ios: clkrt = %x cmdat = %x\n", + host->clkrt, host->cmdat); +} + +static struct mmc_host_ops pxamci_ops = { + .request = pxamci_request, + .set_ios = pxamci_set_ios, +}; + +static void pxamci_dma_irq(int dma, void *devid, struct pt_regs *regs) +{ + printk(KERN_ERR "DMA%d: IRQ???\n", dma); + DCSR(dma) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR; +} + +static irqreturn_t pxamci_detect_irq(int irq, void *devid, struct pt_regs *regs) +{ + mmc_detect_change(devid); + return IRQ_HANDLED; +} + +static int pxamci_probe(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct mmc_host *mmc; + struct pxamci_host *host = NULL; + struct resource *r; + int ret, irq; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + irq = platform_get_irq(pdev, 0); + if (!r || irq == NO_IRQ) + return -ENXIO; + + r = request_mem_region(r->start, SZ_4K, DRIVER_NAME); + if (!r) + return -EBUSY; + + mmc = mmc_alloc_host(sizeof(struct pxamci_host), dev); + if (!mmc) { + ret = -ENOMEM; + goto out; + } + + mmc->ops = &pxamci_ops; + mmc->f_min = CLOCKRATE_MIN; + mmc->f_max = CLOCKRATE_MAX; + + /* + * We can do SG-DMA, but we don't because we never know how much + * data we successfully wrote to the card. + */ + mmc->max_phys_segs = NR_SG; + + /* + * Our hardware DMA can handle a maximum of one page per SG entry. + */ + mmc->max_seg_size = PAGE_SIZE; + + host = mmc_priv(mmc); + host->mmc = mmc; + host->dma = -1; + host->pdata = pdev->dev.platform_data; + mmc->ocr_avail = host->pdata ? + host->pdata->ocr_mask : + MMC_VDD_32_33|MMC_VDD_33_34; + + host->sg_cpu = dma_alloc_coherent(dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL); + if (!host->sg_cpu) { + ret = -ENOMEM; + goto out; + } + + spin_lock_init(&host->lock); + host->res = r; + host->irq = irq; + host->imask = MMC_I_MASK_ALL; + + host->base = ioremap(r->start, SZ_4K); + if (!host->base) { + ret = -ENOMEM; + goto out; + } + + /* + * Ensure that the host controller is shut down, and setup + * with our defaults. + */ + pxamci_stop_clock(host); + writel(0, host->base + MMC_SPI); + writel(64, host->base + MMC_RESTO); + writel(host->imask, host->base + MMC_I_MASK); + + host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW, + pxamci_dma_irq, host); + if (host->dma < 0) { + ret = -EBUSY; + goto out; + } + + ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host); + if (ret) + goto out; + + dev_set_drvdata(dev, mmc); + + if (host->pdata && host->pdata->init) + host->pdata->init(dev, pxamci_detect_irq, mmc); + + mmc_add_host(mmc); + + return 0; + + out: + if (host) { + if (host->dma >= 0) + pxa_free_dma(host->dma); + if (host->base) + iounmap(host->base); + if (host->sg_cpu) + dma_free_coherent(dev, PAGE_SIZE, host->sg_cpu, host->sg_dma); + } + if (mmc) + mmc_free_host(mmc); + release_resource(r); + return ret; +} + +static int pxamci_remove(struct device *dev) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + + dev_set_drvdata(dev, NULL); + + if (mmc) { + struct pxamci_host *host = mmc_priv(mmc); + + if (host->pdata && host->pdata->exit) + host->pdata->exit(dev, mmc); + + mmc_remove_host(mmc); + + pxamci_stop_clock(host); + writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD| + END_CMD_RES|PRG_DONE|DATA_TRAN_DONE, + host->base + MMC_I_MASK); + + DRCMRRXMMC = 0; + DRCMRTXMMC = 0; + + free_irq(host->irq, host); + pxa_free_dma(host->dma); + iounmap(host->base); + dma_free_coherent(dev, PAGE_SIZE, host->sg_cpu, host->sg_dma); + + release_resource(host->res); + + mmc_free_host(mmc); + } + return 0; +} + +#ifdef CONFIG_PM +static int pxamci_suspend(struct device *dev, u32 state, u32 level) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + int ret = 0; + + if (mmc && level == SUSPEND_DISABLE) + ret = mmc_suspend_host(mmc, state); + + return ret; +} + +static int pxamci_resume(struct device *dev, u32 level) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + int ret = 0; + + if (mmc && level == RESUME_ENABLE) + ret = mmc_resume_host(mmc); + + return ret; +} +#else +#define pxamci_suspend NULL +#define pxamci_resume NULL +#endif + +static struct device_driver pxamci_driver = { + .name = DRIVER_NAME, + .bus = &platform_bus_type, + .probe = pxamci_probe, + .remove = pxamci_remove, + .suspend = pxamci_suspend, + .resume = pxamci_resume, +}; + +static int __init pxamci_init(void) +{ + return driver_register(&pxamci_driver); +} + +static void __exit pxamci_exit(void) +{ + driver_unregister(&pxamci_driver); +} + +module_init(pxamci_init); +module_exit(pxamci_exit); + +MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/mmc/pxamci.h b/drivers/mmc/pxamci.h new file mode 100644 index 00000000000..1b163220df2 --- /dev/null +++ b/drivers/mmc/pxamci.h @@ -0,0 +1,124 @@ +#undef MMC_STRPCL +#undef MMC_STAT +#undef MMC_CLKRT +#undef MMC_SPI +#undef MMC_CMDAT +#undef MMC_RESTO +#undef MMC_RDTO +#undef MMC_BLKLEN +#undef MMC_NOB +#undef MMC_PRTBUF +#undef MMC_I_MASK +#undef END_CMD_RES +#undef PRG_DONE +#undef DATA_TRAN_DONE +#undef MMC_I_REG +#undef MMC_CMD +#undef MMC_ARGH +#undef MMC_ARGL +#undef MMC_RES +#undef MMC_RXFIFO +#undef MMC_TXFIFO + +#define MMC_STRPCL 0x0000 +#define STOP_CLOCK (1 << 0) +#define START_CLOCK (2 << 0) + +#define MMC_STAT 0x0004 +#define STAT_END_CMD_RES (1 << 13) +#define STAT_PRG_DONE (1 << 12) +#define STAT_DATA_TRAN_DONE (1 << 11) +#define STAT_CLK_EN (1 << 8) +#define STAT_RECV_FIFO_FULL (1 << 7) +#define STAT_XMIT_FIFO_EMPTY (1 << 6) +#define STAT_RES_CRC_ERR (1 << 5) +#define STAT_SPI_READ_ERROR_TOKEN (1 << 4) +#define STAT_CRC_READ_ERROR (1 << 3) +#define STAT_CRC_WRITE_ERROR (1 << 2) +#define STAT_TIME_OUT_RESPONSE (1 << 1) +#define STAT_READ_TIME_OUT (1 << 0) + +#define MMC_CLKRT 0x0008 /* 3 bit */ + +#define MMC_SPI 0x000c +#define SPI_CS_ADDRESS (1 << 3) +#define SPI_CS_EN (1 << 2) +#define CRC_ON (1 << 1) +#define SPI_EN (1 << 0) + +#define MMC_CMDAT 0x0010 +#define CMDAT_DMAEN (1 << 7) +#define CMDAT_INIT (1 << 6) +#define CMDAT_BUSY (1 << 5) +#define CMDAT_STREAM (1 << 4) /* 1 = stream */ +#define CMDAT_WRITE (1 << 3) /* 1 = write */ +#define CMDAT_DATAEN (1 << 2) +#define CMDAT_RESP_NONE (0 << 0) +#define CMDAT_RESP_SHORT (1 << 0) +#define CMDAT_RESP_R2 (2 << 0) +#define CMDAT_RESP_R3 (3 << 0) + +#define MMC_RESTO 0x0014 /* 7 bit */ + +#define MMC_RDTO 0x0018 /* 16 bit */ + +#define MMC_BLKLEN 0x001c /* 10 bit */ + +#define MMC_NOB 0x0020 /* 16 bit */ + +#define MMC_PRTBUF 0x0024 +#define BUF_PART_FULL (1 << 0) + +#define MMC_I_MASK 0x0028 + +/*PXA27x MMC interrupts*/ +#define SDIO_SUSPEND_ACK (1 << 12) +#define SDIO_INT (1 << 11) +#define RD_STALLED (1 << 10) +#define RES_ERR (1 << 9) +#define DAT_ERR (1 << 8) +#define TINT (1 << 7) + +/*PXA2xx MMC interrupts*/ +#define TXFIFO_WR_REQ (1 << 6) +#define RXFIFO_RD_REQ (1 << 5) +#define CLK_IS_OFF (1 << 4) +#define STOP_CMD (1 << 3) +#define END_CMD_RES (1 << 2) +#define PRG_DONE (1 << 1) +#define DATA_TRAN_DONE (1 << 0) + +#ifdef CONFIG_PXA27x +#define MMC_I_MASK_ALL 0x00001fff +#else +#define MMC_I_MASK_ALL 0x0000007f +#endif + +#define MMC_I_REG 0x002c +/* same as MMC_I_MASK */ + +#define MMC_CMD 0x0030 + +#define MMC_ARGH 0x0034 /* 16 bit */ + +#define MMC_ARGL 0x0038 /* 16 bit */ + +#define MMC_RES 0x003c /* 16 bit */ + +#define MMC_RXFIFO 0x0040 /* 8 bit */ + +#define MMC_TXFIFO 0x0044 /* 8 bit */ + +/* + * The base MMC clock rate + */ +#ifdef CONFIG_PXA27x +#define CLOCKRATE_MIN 304688 +#define CLOCKRATE_MAX 19500000 +#else +#define CLOCKRATE_MIN 312500 +#define CLOCKRATE_MAX 20000000 +#endif + +#define CLOCKRATE CLOCKRATE_MAX + diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c new file mode 100644 index 00000000000..938bca0414e --- /dev/null +++ b/drivers/mmc/wbsd.c @@ -0,0 +1,1651 @@ +/* + * linux/drivers/mmc/wbsd.c - Winbond W83L51xD SD/MMC driver + * + * Copyright (C) 2004-2005 Pierre Ossman, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * + * Warning! + * + * Changes to the FIFO system should be done with extreme care since + * the hardware is full of bugs related to the FIFO. Known issues are: + * + * - FIFO size field in FSR is always zero. + * + * - FIFO interrupts tend not to work as they should. Interrupts are + * triggered only for full/empty events, not for threshold values. + * + * - On APIC systems the FIFO empty interrupt is sometimes lost. + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/highmem.h> +#include <linux/mmc/host.h> +#include <linux/mmc/protocol.h> + +#include <asm/io.h> +#include <asm/dma.h> +#include <asm/scatterlist.h> + +#include "wbsd.h" + +#define DRIVER_NAME "wbsd" +#define DRIVER_VERSION "1.1" + +#ifdef CONFIG_MMC_DEBUG +#define DBG(x...) \ + printk(KERN_DEBUG DRIVER_NAME ": " x) +#define DBGF(f, x...) \ + printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__ , ##x) +#else +#define DBG(x...) do { } while (0) +#define DBGF(x...) do { } while (0) +#endif + +static unsigned int io = 0x248; +static unsigned int irq = 6; +static int dma = 2; + +#ifdef CONFIG_MMC_DEBUG +void DBG_REG(int reg, u8 value) +{ + int i; + + printk(KERN_DEBUG "wbsd: Register %d: 0x%02X %3d '%c' ", + reg, (int)value, (int)value, (value < 0x20)?'.':value); + + for (i = 7;i >= 0;i--) + { + if (value & (1 << i)) + printk("x"); + else + printk("."); + } + + printk("\n"); +} +#else +#define DBG_REG(r, v) do {} while (0) +#endif + +/* + * Basic functions + */ + +static inline void wbsd_unlock_config(struct wbsd_host* host) +{ + outb(host->unlock_code, host->config); + outb(host->unlock_code, host->config); +} + +static inline void wbsd_lock_config(struct wbsd_host* host) +{ + outb(LOCK_CODE, host->config); +} + +static inline void wbsd_write_config(struct wbsd_host* host, u8 reg, u8 value) +{ + outb(reg, host->config); + outb(value, host->config + 1); +} + +static inline u8 wbsd_read_config(struct wbsd_host* host, u8 reg) +{ + outb(reg, host->config); + return inb(host->config + 1); +} + +static inline void wbsd_write_index(struct wbsd_host* host, u8 index, u8 value) +{ + outb(index, host->base + WBSD_IDXR); + outb(value, host->base + WBSD_DATAR); +} + +static inline u8 wbsd_read_index(struct wbsd_host* host, u8 index) +{ + outb(index, host->base + WBSD_IDXR); + return inb(host->base + WBSD_DATAR); +} + +/* + * Common routines + */ + +static void wbsd_init_device(struct wbsd_host* host) +{ + u8 setup, ier; + + /* + * Reset chip (SD/MMC part) and fifo. + */ + setup = wbsd_read_index(host, WBSD_IDX_SETUP); + setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET; + wbsd_write_index(host, WBSD_IDX_SETUP, setup); + + /* + * Read back default clock. + */ + host->clk = wbsd_read_index(host, WBSD_IDX_CLK); + + /* + * Power down port. + */ + outb(WBSD_POWER_N, host->base + WBSD_CSR); + + /* + * Set maximum timeout. + */ + wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F); + + /* + * Enable interesting interrupts. + */ + ier = 0; + ier |= WBSD_EINT_CARD; + ier |= WBSD_EINT_FIFO_THRE; + ier |= WBSD_EINT_CCRC; + ier |= WBSD_EINT_TIMEOUT; + ier |= WBSD_EINT_CRC; + ier |= WBSD_EINT_TC; + + outb(ier, host->base + WBSD_EIR); + + /* + * Clear interrupts. + */ + inb(host->base + WBSD_ISR); +} + +static void wbsd_reset(struct wbsd_host* host) +{ + u8 setup; + + printk(KERN_ERR DRIVER_NAME ": Resetting chip\n"); + + /* + * Soft reset of chip (SD/MMC part). + */ + setup = wbsd_read_index(host, WBSD_IDX_SETUP); + setup |= WBSD_SOFT_RESET; + wbsd_write_index(host, WBSD_IDX_SETUP, setup); +} + +static void wbsd_request_end(struct wbsd_host* host, struct mmc_request* mrq) +{ + unsigned long dmaflags; + + DBGF("Ending request, cmd (%x)\n", mrq->cmd->opcode); + + if (host->dma >= 0) + { + /* + * Release ISA DMA controller. + */ + dmaflags = claim_dma_lock(); + disable_dma(host->dma); + clear_dma_ff(host->dma); + release_dma_lock(dmaflags); + + /* + * Disable DMA on host. + */ + wbsd_write_index(host, WBSD_IDX_DMA, 0); + } + + host->mrq = NULL; + + /* + * MMC layer might call back into the driver so first unlock. + */ + spin_unlock(&host->lock); + mmc_request_done(host->mmc, mrq); + spin_lock(&host->lock); +} + +/* + * Scatter/gather functions + */ + +static inline void wbsd_init_sg(struct wbsd_host* host, struct mmc_data* data) +{ + /* + * Get info. about SG list from data structure. + */ + host->cur_sg = data->sg; + host->num_sg = data->sg_len; + + host->offset = 0; + host->remain = host->cur_sg->length; +} + +static inline int wbsd_next_sg(struct wbsd_host* host) +{ + /* + * Skip to next SG entry. + */ + host->cur_sg++; + host->num_sg--; + + /* + * Any entries left? + */ + if (host->num_sg > 0) + { + host->offset = 0; + host->remain = host->cur_sg->length; + } + + return host->num_sg; +} + +static inline char* wbsd_kmap_sg(struct wbsd_host* host) +{ + host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) + + host->cur_sg->offset; + return host->mapped_sg; +} + +static inline void wbsd_kunmap_sg(struct wbsd_host* host) +{ + kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ); +} + +static inline void wbsd_sg_to_dma(struct wbsd_host* host, struct mmc_data* data) +{ + unsigned int len, i, size; + struct scatterlist* sg; + char* dmabuf = host->dma_buffer; + char* sgbuf; + + size = host->size; + + sg = data->sg; + len = data->sg_len; + + /* + * Just loop through all entries. Size might not + * be the entire list though so make sure that + * we do not transfer too much. + */ + for (i = 0;i < len;i++) + { + sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset; + if (size < sg[i].length) + memcpy(dmabuf, sgbuf, size); + else + memcpy(dmabuf, sgbuf, sg[i].length); + kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ); + dmabuf += sg[i].length; + + if (size < sg[i].length) + size = 0; + else + size -= sg[i].length; + + if (size == 0) + break; + } + + /* + * Check that we didn't get a request to transfer + * more data than can fit into the SG list. + */ + + BUG_ON(size != 0); + + host->size -= size; +} + +static inline void wbsd_dma_to_sg(struct wbsd_host* host, struct mmc_data* data) +{ + unsigned int len, i, size; + struct scatterlist* sg; + char* dmabuf = host->dma_buffer; + char* sgbuf; + + size = host->size; + + sg = data->sg; + len = data->sg_len; + + /* + * Just loop through all entries. Size might not + * be the entire list though so make sure that + * we do not transfer too much. + */ + for (i = 0;i < len;i++) + { + sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset; + if (size < sg[i].length) + memcpy(sgbuf, dmabuf, size); + else + memcpy(sgbuf, dmabuf, sg[i].length); + kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ); + dmabuf += sg[i].length; + + if (size < sg[i].length) + size = 0; + else + size -= sg[i].length; + + if (size == 0) + break; + } + + /* + * Check that we didn't get a request to transfer + * more data than can fit into the SG list. + */ + + BUG_ON(size != 0); + + host->size -= size; +} + +/* + * Command handling + */ + +static inline void wbsd_get_short_reply(struct wbsd_host* host, + struct mmc_command* cmd) +{ + /* + * Correct response type? + */ + if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) + { + cmd->error = MMC_ERR_INVALID; + return; + } + + cmd->resp[0] = + wbsd_read_index(host, WBSD_IDX_RESP12) << 24; + cmd->resp[0] |= + wbsd_read_index(host, WBSD_IDX_RESP13) << 16; + cmd->resp[0] |= + wbsd_read_index(host, WBSD_IDX_RESP14) << 8; + cmd->resp[0] |= + wbsd_read_index(host, WBSD_IDX_RESP15) << 0; + cmd->resp[1] = + wbsd_read_index(host, WBSD_IDX_RESP16) << 24; +} + +static inline void wbsd_get_long_reply(struct wbsd_host* host, + struct mmc_command* cmd) +{ + int i; + + /* + * Correct response type? + */ + if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) + { + cmd->error = MMC_ERR_INVALID; + return; + } + + for (i = 0;i < 4;i++) + { + cmd->resp[i] = + wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24; + cmd->resp[i] |= + wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16; + cmd->resp[i] |= + wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8; + cmd->resp[i] |= + wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0; + } +} + +static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs); + +static void wbsd_send_command(struct wbsd_host* host, struct mmc_command* cmd) +{ + int i; + u8 status, isr; + + DBGF("Sending cmd (%x)\n", cmd->opcode); + + /* + * Clear accumulated ISR. The interrupt routine + * will fill this one with events that occur during + * transfer. + */ + host->isr = 0; + + /* + * Send the command (CRC calculated by host). + */ + outb(cmd->opcode, host->base + WBSD_CMDR); + for (i = 3;i >= 0;i--) + outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR); + + cmd->error = MMC_ERR_NONE; + + /* + * Wait for the request to complete. + */ + do { + status = wbsd_read_index(host, WBSD_IDX_STATUS); + } while (status & WBSD_CARDTRAFFIC); + + /* + * Do we expect a reply? + */ + if ((cmd->flags & MMC_RSP_MASK) != MMC_RSP_NONE) + { + /* + * Read back status. + */ + isr = host->isr; + + /* Card removed? */ + if (isr & WBSD_INT_CARD) + cmd->error = MMC_ERR_TIMEOUT; + /* Timeout? */ + else if (isr & WBSD_INT_TIMEOUT) + cmd->error = MMC_ERR_TIMEOUT; + /* CRC? */ + else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC)) + cmd->error = MMC_ERR_BADCRC; + /* All ok */ + else + { + if ((cmd->flags & MMC_RSP_MASK) == MMC_RSP_SHORT) + wbsd_get_short_reply(host, cmd); + else + wbsd_get_long_reply(host, cmd); + } + } + + DBGF("Sent cmd (%x), res %d\n", cmd->opcode, cmd->error); +} + +/* + * Data functions + */ + +static void wbsd_empty_fifo(struct wbsd_host* host) +{ + struct mmc_data* data = host->mrq->cmd->data; + char* buffer; + int i, fsr, fifo; + + /* + * Handle excessive data. + */ + if (data->bytes_xfered == host->size) + return; + + buffer = wbsd_kmap_sg(host) + host->offset; + + /* + * Drain the fifo. This has a tendency to loop longer + * than the FIFO length (usually one block). + */ + while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) + { + /* + * The size field in the FSR is broken so we have to + * do some guessing. + */ + if (fsr & WBSD_FIFO_FULL) + fifo = 16; + else if (fsr & WBSD_FIFO_FUTHRE) + fifo = 8; + else + fifo = 1; + + for (i = 0;i < fifo;i++) + { + *buffer = inb(host->base + WBSD_DFR); + buffer++; + host->offset++; + host->remain--; + + data->bytes_xfered++; + + /* + * Transfer done? + */ + if (data->bytes_xfered == host->size) + { + wbsd_kunmap_sg(host); + return; + } + + /* + * End of scatter list entry? + */ + if (host->remain == 0) + { + wbsd_kunmap_sg(host); + + /* + * Get next entry. Check if last. + */ + if (!wbsd_next_sg(host)) + { + /* + * We should never reach this point. + * It means that we're trying to + * transfer more blocks than can fit + * into the scatter list. + */ + BUG_ON(1); + + host->size = data->bytes_xfered; + + return; + } + + buffer = wbsd_kmap_sg(host); + } + } + } + + wbsd_kunmap_sg(host); + + /* + * This is a very dirty hack to solve a + * hardware problem. The chip doesn't trigger + * FIFO threshold interrupts properly. + */ + if ((host->size - data->bytes_xfered) < 16) + tasklet_schedule(&host->fifo_tasklet); +} + +static void wbsd_fill_fifo(struct wbsd_host* host) +{ + struct mmc_data* data = host->mrq->cmd->data; + char* buffer; + int i, fsr, fifo; + + /* + * Check that we aren't being called after the + * entire buffer has been transfered. + */ + if (data->bytes_xfered == host->size) + return; + + buffer = wbsd_kmap_sg(host) + host->offset; + + /* + * Fill the fifo. This has a tendency to loop longer + * than the FIFO length (usually one block). + */ + while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) + { + /* + * The size field in the FSR is broken so we have to + * do some guessing. + */ + if (fsr & WBSD_FIFO_EMPTY) + fifo = 0; + else if (fsr & WBSD_FIFO_EMTHRE) + fifo = 8; + else + fifo = 15; + + for (i = 16;i > fifo;i--) + { + outb(*buffer, host->base + WBSD_DFR); + buffer++; + host->offset++; + host->remain--; + + data->bytes_xfered++; + + /* + * Transfer done? + */ + if (data->bytes_xfered == host->size) + { + wbsd_kunmap_sg(host); + return; + } + + /* + * End of scatter list entry? + */ + if (host->remain == 0) + { + wbsd_kunmap_sg(host); + + /* + * Get next entry. Check if last. + */ + if (!wbsd_next_sg(host)) + { + /* + * We should never reach this point. + * It means that we're trying to + * transfer more blocks than can fit + * into the scatter list. + */ + BUG_ON(1); + + host->size = data->bytes_xfered; + + return; + } + + buffer = wbsd_kmap_sg(host); + } + } + } + + wbsd_kunmap_sg(host); +} + +static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data) +{ + u16 blksize; + u8 setup; + unsigned long dmaflags; + + DBGF("blksz %04x blks %04x flags %08x\n", + 1 << data->blksz_bits, data->blocks, data->flags); + DBGF("tsac %d ms nsac %d clk\n", + data->timeout_ns / 1000000, data->timeout_clks); + + /* + * Calculate size. + */ + host->size = data->blocks << data->blksz_bits; + + /* + * Check timeout values for overflow. + * (Yes, some cards cause this value to overflow). + */ + if (data->timeout_ns > 127000000) + wbsd_write_index(host, WBSD_IDX_TAAC, 127); + else + wbsd_write_index(host, WBSD_IDX_TAAC, data->timeout_ns/1000000); + + if (data->timeout_clks > 255) + wbsd_write_index(host, WBSD_IDX_NSAC, 255); + else + wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks); + + /* + * Inform the chip of how large blocks will be + * sent. It needs this to determine when to + * calculate CRC. + * + * Space for CRC must be included in the size. + */ + blksize = (1 << data->blksz_bits) + 2; + + wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0); + wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF); + + /* + * Clear the FIFO. This is needed even for DMA + * transfers since the chip still uses the FIFO + * internally. + */ + setup = wbsd_read_index(host, WBSD_IDX_SETUP); + setup |= WBSD_FIFO_RESET; + wbsd_write_index(host, WBSD_IDX_SETUP, setup); + + /* + * DMA transfer? + */ + if (host->dma >= 0) + { + /* + * The buffer for DMA is only 64 kB. + */ + BUG_ON(host->size > 0x10000); + if (host->size > 0x10000) + { + data->error = MMC_ERR_INVALID; + return; + } + + /* + * Transfer data from the SG list to + * the DMA buffer. + */ + if (data->flags & MMC_DATA_WRITE) + wbsd_sg_to_dma(host, data); + + /* + * Initialise the ISA DMA controller. + */ + dmaflags = claim_dma_lock(); + disable_dma(host->dma); + clear_dma_ff(host->dma); + if (data->flags & MMC_DATA_READ) + set_dma_mode(host->dma, DMA_MODE_READ & ~0x40); + else + set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40); + set_dma_addr(host->dma, host->dma_addr); + set_dma_count(host->dma, host->size); + + enable_dma(host->dma); + release_dma_lock(dmaflags); + + /* + * Enable DMA on the host. + */ + wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE); + } + else + { + /* + * This flag is used to keep printk + * output to a minimum. + */ + host->firsterr = 1; + + /* + * Initialise the SG list. + */ + wbsd_init_sg(host, data); + + /* + * Turn off DMA. + */ + wbsd_write_index(host, WBSD_IDX_DMA, 0); + + /* + * Set up FIFO threshold levels (and fill + * buffer if doing a write). + */ + if (data->flags & MMC_DATA_READ) + { + wbsd_write_index(host, WBSD_IDX_FIFOEN, + WBSD_FIFOEN_FULL | 8); + } + else + { + wbsd_write_index(host, WBSD_IDX_FIFOEN, + WBSD_FIFOEN_EMPTY | 8); + wbsd_fill_fifo(host); + } + } + + data->error = MMC_ERR_NONE; +} + +static void wbsd_finish_data(struct wbsd_host* host, struct mmc_data* data) +{ + unsigned long dmaflags; + int count; + u8 status; + + WARN_ON(host->mrq == NULL); + + /* + * Send a stop command if needed. + */ + if (data->stop) + wbsd_send_command(host, data->stop); + + /* + * Wait for the controller to leave data + * transfer state. + */ + do + { + status = wbsd_read_index(host, WBSD_IDX_STATUS); + } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE)); + + /* + * DMA transfer? + */ + if (host->dma >= 0) + { + /* + * Disable DMA on the host. + */ + wbsd_write_index(host, WBSD_IDX_DMA, 0); + + /* + * Turn of ISA DMA controller. + */ + dmaflags = claim_dma_lock(); + disable_dma(host->dma); + clear_dma_ff(host->dma); + count = get_dma_residue(host->dma); + release_dma_lock(dmaflags); + + /* + * Any leftover data? + */ + if (count) + { + printk(KERN_ERR DRIVER_NAME ": Incomplete DMA " + "transfer. %d bytes left.\n", count); + + data->error = MMC_ERR_FAILED; + } + else + { + /* + * Transfer data from DMA buffer to + * SG list. + */ + if (data->flags & MMC_DATA_READ) + wbsd_dma_to_sg(host, data); + + data->bytes_xfered = host->size; + } + } + + DBGF("Ending data transfer (%d bytes)\n", data->bytes_xfered); + + wbsd_request_end(host, host->mrq); +} + +/* + * MMC Callbacks + */ + +static void wbsd_request(struct mmc_host* mmc, struct mmc_request* mrq) +{ + struct wbsd_host* host = mmc_priv(mmc); + struct mmc_command* cmd; + + /* + * Disable tasklets to avoid a deadlock. + */ + spin_lock_bh(&host->lock); + + BUG_ON(host->mrq != NULL); + + cmd = mrq->cmd; + + host->mrq = mrq; + + /* + * If there is no card in the slot then + * timeout immediatly. + */ + if (!(inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)) + { + cmd->error = MMC_ERR_TIMEOUT; + goto done; + } + + /* + * Does the request include data? + */ + if (cmd->data) + { + wbsd_prepare_data(host, cmd->data); + + if (cmd->data->error != MMC_ERR_NONE) + goto done; + } + + wbsd_send_command(host, cmd); + + /* + * If this is a data transfer the request + * will be finished after the data has + * transfered. + */ + if (cmd->data && (cmd->error == MMC_ERR_NONE)) + { + /* + * Dirty fix for hardware bug. + */ + if (host->dma == -1) + tasklet_schedule(&host->fifo_tasklet); + + spin_unlock_bh(&host->lock); + + return; + } + +done: + wbsd_request_end(host, mrq); + + spin_unlock_bh(&host->lock); +} + +static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios) +{ + struct wbsd_host* host = mmc_priv(mmc); + u8 clk, setup, pwr; + + DBGF("clock %uHz busmode %u powermode %u Vdd %u\n", + ios->clock, ios->bus_mode, ios->power_mode, ios->vdd); + + spin_lock_bh(&host->lock); + + /* + * Reset the chip on each power off. + * Should clear out any weird states. + */ + if (ios->power_mode == MMC_POWER_OFF) + wbsd_init_device(host); + + if (ios->clock >= 24000000) + clk = WBSD_CLK_24M; + else if (ios->clock >= 16000000) + clk = WBSD_CLK_16M; + else if (ios->clock >= 12000000) + clk = WBSD_CLK_12M; + else + clk = WBSD_CLK_375K; + + /* + * Only write to the clock register when + * there is an actual change. + */ + if (clk != host->clk) + { + wbsd_write_index(host, WBSD_IDX_CLK, clk); + host->clk = clk; + } + + if (ios->power_mode != MMC_POWER_OFF) + { + /* + * Power up card. + */ + pwr = inb(host->base + WBSD_CSR); + pwr &= ~WBSD_POWER_N; + outb(pwr, host->base + WBSD_CSR); + + /* + * This behaviour is stolen from the + * Windows driver. Don't know why, but + * it is needed. + */ + setup = wbsd_read_index(host, WBSD_IDX_SETUP); + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) + setup |= WBSD_DAT3_H; + else + setup &= ~WBSD_DAT3_H; + wbsd_write_index(host, WBSD_IDX_SETUP, setup); + + mdelay(1); + } + + spin_unlock_bh(&host->lock); +} + +/* + * Tasklets + */ + +inline static struct mmc_data* wbsd_get_data(struct wbsd_host* host) +{ + WARN_ON(!host->mrq); + if (!host->mrq) + return NULL; + + WARN_ON(!host->mrq->cmd); + if (!host->mrq->cmd) + return NULL; + + WARN_ON(!host->mrq->cmd->data); + if (!host->mrq->cmd->data) + return NULL; + + return host->mrq->cmd->data; +} + +static void wbsd_tasklet_card(unsigned long param) +{ + struct wbsd_host* host = (struct wbsd_host*)param; + u8 csr; + + spin_lock(&host->lock); + + csr = inb(host->base + WBSD_CSR); + WARN_ON(csr == 0xff); + + if (csr & WBSD_CARDPRESENT) + DBG("Card inserted\n"); + else + { + DBG("Card removed\n"); + + if (host->mrq) + { + printk(KERN_ERR DRIVER_NAME + ": Card removed during transfer!\n"); + wbsd_reset(host); + + host->mrq->cmd->error = MMC_ERR_FAILED; + tasklet_schedule(&host->finish_tasklet); + } + } + + /* + * Unlock first since we might get a call back. + */ + spin_unlock(&host->lock); + + mmc_detect_change(host->mmc); +} + +static void wbsd_tasklet_fifo(unsigned long param) +{ + struct wbsd_host* host = (struct wbsd_host*)param; + struct mmc_data* data; + + spin_lock(&host->lock); + + if (!host->mrq) + goto end; + + data = wbsd_get_data(host); + if (!data) + goto end; + + if (data->flags & MMC_DATA_WRITE) + wbsd_fill_fifo(host); + else + wbsd_empty_fifo(host); + + /* + * Done? + */ + if (host->size == data->bytes_xfered) + { + wbsd_write_index(host, WBSD_IDX_FIFOEN, 0); + tasklet_schedule(&host->finish_tasklet); + } + +end: + spin_unlock(&host->lock); +} + +static void wbsd_tasklet_crc(unsigned long param) +{ + struct wbsd_host* host = (struct wbsd_host*)param; + struct mmc_data* data; + + spin_lock(&host->lock); + + if (!host->mrq) + goto end; + + data = wbsd_get_data(host); + if (!data) + goto end; + + DBGF("CRC error\n"); + + data->error = MMC_ERR_BADCRC; + + tasklet_schedule(&host->finish_tasklet); + +end: + spin_unlock(&host->lock); +} + +static void wbsd_tasklet_timeout(unsigned long param) +{ + struct wbsd_host* host = (struct wbsd_host*)param; + struct mmc_data* data; + + spin_lock(&host->lock); + + if (!host->mrq) + goto end; + + data = wbsd_get_data(host); + if (!data) + goto end; + + DBGF("Timeout\n"); + + data->error = MMC_ERR_TIMEOUT; + + tasklet_schedule(&host->finish_tasklet); + +end: + spin_unlock(&host->lock); +} + +static void wbsd_tasklet_finish(unsigned long param) +{ + struct wbsd_host* host = (struct wbsd_host*)param; + struct mmc_data* data; + + spin_lock(&host->lock); + + WARN_ON(!host->mrq); + if (!host->mrq) + goto end; + + data = wbsd_get_data(host); + if (!data) + goto end; + + wbsd_finish_data(host, data); + +end: + spin_unlock(&host->lock); +} + +static void wbsd_tasklet_block(unsigned long param) +{ + struct wbsd_host* host = (struct wbsd_host*)param; + struct mmc_data* data; + + spin_lock(&host->lock); + + if ((wbsd_read_index(host, WBSD_IDX_CRCSTATUS) & WBSD_CRC_MASK) != + WBSD_CRC_OK) + { + data = wbsd_get_data(host); + if (!data) + goto end; + + DBGF("CRC error\n"); + + data->error = MMC_ERR_BADCRC; + + tasklet_schedule(&host->finish_tasklet); + } + +end: + spin_unlock(&host->lock); +} + +/* + * Interrupt handling + */ + +static irqreturn_t wbsd_irq(int irq, void *dev_id, struct pt_regs *regs) +{ + struct wbsd_host* host = dev_id; + int isr; + + isr = inb(host->base + WBSD_ISR); + + /* + * Was it actually our hardware that caused the interrupt? + */ + if (isr == 0xff || isr == 0x00) + return IRQ_NONE; + + host->isr |= isr; + + /* + * Schedule tasklets as needed. + */ + if (isr & WBSD_INT_CARD) + tasklet_schedule(&host->card_tasklet); + if (isr & WBSD_INT_FIFO_THRE) + tasklet_schedule(&host->fifo_tasklet); + if (isr & WBSD_INT_CRC) + tasklet_hi_schedule(&host->crc_tasklet); + if (isr & WBSD_INT_TIMEOUT) + tasklet_hi_schedule(&host->timeout_tasklet); + if (isr & WBSD_INT_BUSYEND) + tasklet_hi_schedule(&host->block_tasklet); + if (isr & WBSD_INT_TC) + tasklet_schedule(&host->finish_tasklet); + + return IRQ_HANDLED; +} + +/* + * Support functions for probe + */ + +static int wbsd_scan(struct wbsd_host* host) +{ + int i, j, k; + int id; + + /* + * Iterate through all ports, all codes to + * find hardware that is in our known list. + */ + for (i = 0;i < sizeof(config_ports)/sizeof(int);i++) + { + if (!request_region(config_ports[i], 2, DRIVER_NAME)) + continue; + + for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++) + { + id = 0xFFFF; + + outb(unlock_codes[j], config_ports[i]); + outb(unlock_codes[j], config_ports[i]); + + outb(WBSD_CONF_ID_HI, config_ports[i]); + id = inb(config_ports[i] + 1) << 8; + + outb(WBSD_CONF_ID_LO, config_ports[i]); + id |= inb(config_ports[i] + 1); + + for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++) + { + if (id == valid_ids[k]) + { + host->chip_id = id; + host->config = config_ports[i]; + host->unlock_code = unlock_codes[i]; + + return 0; + } + } + + if (id != 0xFFFF) + { + DBG("Unknown hardware (id %x) found at %x\n", + id, config_ports[i]); + } + + outb(LOCK_CODE, config_ports[i]); + } + + release_region(config_ports[i], 2); + } + + return -ENODEV; +} + +static int wbsd_request_regions(struct wbsd_host* host) +{ + if (io & 0x7) + return -EINVAL; + + if (!request_region(io, 8, DRIVER_NAME)) + return -EIO; + + host->base = io; + + return 0; +} + +static void wbsd_release_regions(struct wbsd_host* host) +{ + if (host->base) + release_region(host->base, 8); + + if (host->config) + release_region(host->config, 2); +} + +static void wbsd_init_dma(struct wbsd_host* host) +{ + host->dma = -1; + + if (dma < 0) + return; + + if (request_dma(dma, DRIVER_NAME)) + goto err; + + /* + * We need to allocate a special buffer in + * order for ISA to be able to DMA to it. + */ + host->dma_buffer = kmalloc(65536, + GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN); + if (!host->dma_buffer) + goto free; + + /* + * Translate the address to a physical address. + */ + host->dma_addr = isa_virt_to_bus(host->dma_buffer); + + /* + * ISA DMA must be aligned on a 64k basis. + */ + if ((host->dma_addr & 0xffff) != 0) + goto kfree; + /* + * ISA cannot access memory above 16 MB. + */ + else if (host->dma_addr >= 0x1000000) + goto kfree; + + host->dma = dma; + + return; + +kfree: + /* + * If we've gotten here then there is some kind of alignment bug + */ + BUG_ON(1); + + kfree(host->dma_buffer); + host->dma_buffer = NULL; + +free: + free_dma(dma); + +err: + printk(KERN_WARNING DRIVER_NAME ": Unable to allocate DMA %d. " + "Falling back on FIFO.\n", dma); +} + +static struct mmc_host_ops wbsd_ops = { + .request = wbsd_request, + .set_ios = wbsd_set_ios, +}; + +/* + * Device probe + */ + +static int wbsd_probe(struct device* dev) +{ + struct wbsd_host* host = NULL; + struct mmc_host* mmc = NULL; + int ret; + + /* + * Allocate MMC structure. + */ + mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev); + if (!mmc) + return -ENOMEM; + + host = mmc_priv(mmc); + host->mmc = mmc; + + /* + * Scan for hardware. + */ + ret = wbsd_scan(host); + if (ret) + goto freemmc; + + /* + * Reset the chip. + */ + wbsd_write_config(host, WBSD_CONF_SWRST, 1); + wbsd_write_config(host, WBSD_CONF_SWRST, 0); + + /* + * Allocate I/O ports. + */ + ret = wbsd_request_regions(host); + if (ret) + goto release; + + /* + * Set host parameters. + */ + mmc->ops = &wbsd_ops; + mmc->f_min = 375000; + mmc->f_max = 24000000; + mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34; + + spin_lock_init(&host->lock); + + /* + * Select SD/MMC function. + */ + wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); + + /* + * Set up card detection. + */ + wbsd_write_config(host, WBSD_CONF_PINS, 0x02); + + /* + * Configure I/O port. + */ + wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8); + wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff); + + /* + * Allocate interrupt. + */ + ret = request_irq(irq, wbsd_irq, SA_SHIRQ, DRIVER_NAME, host); + if (ret) + goto release; + + host->irq = irq; + + /* + * Set up tasklets. + */ + tasklet_init(&host->card_tasklet, wbsd_tasklet_card, (unsigned long)host); + tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo, (unsigned long)host); + tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc, (unsigned long)host); + tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout, (unsigned long)host); + tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish, (unsigned long)host); + tasklet_init(&host->block_tasklet, wbsd_tasklet_block, (unsigned long)host); + + /* + * Configure interrupt. + */ + wbsd_write_config(host, WBSD_CONF_IRQ, host->irq); + + /* + * Allocate DMA. + */ + wbsd_init_dma(host); + + /* + * If all went well, then configure DMA. + */ + if (host->dma >= 0) + wbsd_write_config(host, WBSD_CONF_DRQ, host->dma); + + /* + * Maximum number of segments. Worst case is one sector per segment + * so this will be 64kB/512. + */ + mmc->max_hw_segs = 128; + mmc->max_phys_segs = 128; + + /* + * Maximum number of sectors in one transfer. Also limited by 64kB + * buffer. + */ + mmc->max_sectors = 128; + + /* + * Maximum segment size. Could be one segment with the maximum number + * of segments. + */ + mmc->max_seg_size = mmc->max_sectors * 512; + + /* + * Enable chip. + */ + wbsd_write_config(host, WBSD_CONF_ENABLE, 1); + + /* + * Power up chip. + */ + wbsd_write_config(host, WBSD_CONF_POWER, 0x20); + + /* + * Power Management stuff. No idea how this works. + * Not tested. + */ +#ifdef CONFIG_PM + wbsd_write_config(host, WBSD_CONF_PME, 0xA0); +#endif + + /* + * Reset the chip into a known state. + */ + wbsd_init_device(host); + + dev_set_drvdata(dev, mmc); + + /* + * Add host to MMC layer. + */ + mmc_add_host(mmc); + + printk(KERN_INFO "%s: W83L51xD id %x at 0x%x irq %d dma %d\n", + mmc->host_name, (int)host->chip_id, (int)host->base, + (int)host->irq, (int)host->dma); + + return 0; + +release: + wbsd_release_regions(host); + +freemmc: + mmc_free_host(mmc); + + return ret; +} + +/* + * Device remove + */ + +static int wbsd_remove(struct device* dev) +{ + struct mmc_host* mmc = dev_get_drvdata(dev); + struct wbsd_host* host; + + if (!mmc) + return 0; + + host = mmc_priv(mmc); + + /* + * Unregister host with MMC layer. + */ + mmc_remove_host(mmc); + + /* + * Power down the SD/MMC function. + */ + wbsd_unlock_config(host); + wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD); + wbsd_write_config(host, WBSD_CONF_ENABLE, 0); + wbsd_lock_config(host); + + /* + * Free resources. + */ + if (host->dma_buffer) + kfree(host->dma_buffer); + + if (host->dma >= 0) + free_dma(host->dma); + + free_irq(host->irq, host); + + tasklet_kill(&host->card_tasklet); + tasklet_kill(&host->fifo_tasklet); + tasklet_kill(&host->crc_tasklet); + tasklet_kill(&host->timeout_tasklet); + tasklet_kill(&host->finish_tasklet); + tasklet_kill(&host->block_tasklet); + + wbsd_release_regions(host); + + mmc_free_host(mmc); + + return 0; +} + +/* + * Power management + */ + +#ifdef CONFIG_PM +static int wbsd_suspend(struct device *dev, u32 state, u32 level) +{ + DBGF("Not yet supported\n"); + + return 0; +} + +static int wbsd_resume(struct device *dev, u32 level) +{ + DBGF("Not yet supported\n"); + + return 0; +} +#else +#define wbsd_suspend NULL +#define wbsd_resume NULL +#endif + +static void wbsd_release(struct device *dev) +{ +} + +static struct platform_device wbsd_device = { + .name = DRIVER_NAME, + .id = -1, + .dev = { + .release = wbsd_release, + }, +}; + +static struct device_driver wbsd_driver = { + .name = DRIVER_NAME, + .bus = &platform_bus_type, + .probe = wbsd_probe, + .remove = wbsd_remove, + + .suspend = wbsd_suspend, + .resume = wbsd_resume, +}; + +/* + * Module loading/unloading + */ + +static int __init wbsd_drv_init(void) +{ + int result; + + printk(KERN_INFO DRIVER_NAME + ": Winbond W83L51xD SD/MMC card interface driver, " + DRIVER_VERSION "\n"); + printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n"); + + result = driver_register(&wbsd_driver); + if (result < 0) + return result; + + result = platform_device_register(&wbsd_device); + if (result < 0) + return result; + + return 0; +} + +static void __exit wbsd_drv_exit(void) +{ + platform_device_unregister(&wbsd_device); + + driver_unregister(&wbsd_driver); + + DBG("unloaded\n"); +} + +module_init(wbsd_drv_init); +module_exit(wbsd_drv_exit); +module_param(io, uint, 0444); +module_param(irq, uint, 0444); +module_param(dma, int, 0444); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver"); +MODULE_VERSION(DRIVER_VERSION); + +MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)"); +MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)"); +MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)"); diff --git a/drivers/mmc/wbsd.h b/drivers/mmc/wbsd.h new file mode 100644 index 00000000000..fdc03b56a81 --- /dev/null +++ b/drivers/mmc/wbsd.h @@ -0,0 +1,178 @@ +/* + * linux/drivers/mmc/wbsd.h - Winbond W83L51xD SD/MMC driver + * + * Copyright (C) 2004-2005 Pierre Ossman, All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +const int config_ports[] = { 0x2E, 0x4E }; +const int unlock_codes[] = { 0x83, 0x87 }; + +const int valid_ids[] = { + 0x7112, + }; + +#define LOCK_CODE 0xAA + +#define WBSD_CONF_SWRST 0x02 +#define WBSD_CONF_DEVICE 0x07 +#define WBSD_CONF_ID_HI 0x20 +#define WBSD_CONF_ID_LO 0x21 +#define WBSD_CONF_POWER 0x22 +#define WBSD_CONF_PME 0x23 +#define WBSD_CONF_PMES 0x24 + +#define WBSD_CONF_ENABLE 0x30 +#define WBSD_CONF_PORT_HI 0x60 +#define WBSD_CONF_PORT_LO 0x61 +#define WBSD_CONF_IRQ 0x70 +#define WBSD_CONF_DRQ 0x74 + +#define WBSD_CONF_PINS 0xF0 + +#define DEVICE_SD 0x03 + +#define WBSD_CMDR 0x00 +#define WBSD_DFR 0x01 +#define WBSD_EIR 0x02 +#define WBSD_ISR 0x03 +#define WBSD_FSR 0x04 +#define WBSD_IDXR 0x05 +#define WBSD_DATAR 0x06 +#define WBSD_CSR 0x07 + +#define WBSD_EINT_CARD 0x40 +#define WBSD_EINT_FIFO_THRE 0x20 +#define WBSD_EINT_CCRC 0x10 +#define WBSD_EINT_TIMEOUT 0x08 +#define WBSD_EINT_PROGEND 0x04 +#define WBSD_EINT_CRC 0x02 +#define WBSD_EINT_TC 0x01 + +#define WBSD_INT_PENDING 0x80 +#define WBSD_INT_CARD 0x40 +#define WBSD_INT_FIFO_THRE 0x20 +#define WBSD_INT_CRC 0x10 +#define WBSD_INT_TIMEOUT 0x08 +#define WBSD_INT_PROGEND 0x04 +#define WBSD_INT_BUSYEND 0x02 +#define WBSD_INT_TC 0x01 + +#define WBSD_FIFO_EMPTY 0x80 +#define WBSD_FIFO_FULL 0x40 +#define WBSD_FIFO_EMTHRE 0x20 +#define WBSD_FIFO_FUTHRE 0x10 +#define WBSD_FIFO_SZMASK 0x0F + +#define WBSD_MSLED 0x20 +#define WBSD_POWER_N 0x10 +#define WBSD_WRPT 0x04 +#define WBSD_CARDPRESENT 0x01 + +#define WBSD_IDX_CLK 0x01 +#define WBSD_IDX_PBSMSB 0x02 +#define WBSD_IDX_TAAC 0x03 +#define WBSD_IDX_NSAC 0x04 +#define WBSD_IDX_PBSLSB 0x05 +#define WBSD_IDX_SETUP 0x06 +#define WBSD_IDX_DMA 0x07 +#define WBSD_IDX_FIFOEN 0x08 +#define WBSD_IDX_STATUS 0x10 +#define WBSD_IDX_RSPLEN 0x1E +#define WBSD_IDX_RESP0 0x1F +#define WBSD_IDX_RESP1 0x20 +#define WBSD_IDX_RESP2 0x21 +#define WBSD_IDX_RESP3 0x22 +#define WBSD_IDX_RESP4 0x23 +#define WBSD_IDX_RESP5 0x24 +#define WBSD_IDX_RESP6 0x25 +#define WBSD_IDX_RESP7 0x26 +#define WBSD_IDX_RESP8 0x27 +#define WBSD_IDX_RESP9 0x28 +#define WBSD_IDX_RESP10 0x29 +#define WBSD_IDX_RESP11 0x2A +#define WBSD_IDX_RESP12 0x2B +#define WBSD_IDX_RESP13 0x2C +#define WBSD_IDX_RESP14 0x2D +#define WBSD_IDX_RESP15 0x2E +#define WBSD_IDX_RESP16 0x2F +#define WBSD_IDX_CRCSTATUS 0x30 +#define WBSD_IDX_ISR 0x3F + +#define WBSD_CLK_375K 0x00 +#define WBSD_CLK_12M 0x01 +#define WBSD_CLK_16M 0x02 +#define WBSD_CLK_24M 0x03 + +#define WBSD_DAT3_H 0x08 +#define WBSD_FIFO_RESET 0x04 +#define WBSD_SOFT_RESET 0x02 +#define WBSD_INC_INDEX 0x01 + +#define WBSD_DMA_SINGLE 0x02 +#define WBSD_DMA_ENABLE 0x01 + +#define WBSD_FIFOEN_EMPTY 0x20 +#define WBSD_FIFOEN_FULL 0x10 +#define WBSD_FIFO_THREMASK 0x0F + +#define WBSD_BLOCK_READ 0x80 +#define WBSD_BLOCK_WRITE 0x40 +#define WBSD_BUSY 0x20 +#define WBSD_CARDTRAFFIC 0x04 +#define WBSD_SENDCMD 0x02 +#define WBSD_RECVRES 0x01 + +#define WBSD_RSP_SHORT 0x00 +#define WBSD_RSP_LONG 0x01 + +#define WBSD_CRC_MASK 0x1F +#define WBSD_CRC_OK 0x05 /* S010E (00101) */ +#define WBSD_CRC_FAIL 0x0B /* S101E (01011) */ + + +struct wbsd_host +{ + struct mmc_host* mmc; /* MMC structure */ + + spinlock_t lock; /* Mutex */ + + struct mmc_request* mrq; /* Current request */ + + u8 isr; /* Accumulated ISR */ + + struct scatterlist* cur_sg; /* Current SG entry */ + unsigned int num_sg; /* Number of entries left */ + void* mapped_sg; /* vaddr of mapped sg */ + + unsigned int offset; /* Offset into current entry */ + unsigned int remain; /* Data left in curren entry */ + + int size; /* Total size of transfer */ + + char* dma_buffer; /* ISA DMA buffer */ + dma_addr_t dma_addr; /* Physical address for same */ + + int firsterr; /* See fifo functions */ + + u8 clk; /* Current clock speed */ + + int config; /* Config port */ + u8 unlock_code; /* Code to unlock config */ + + int chip_id; /* ID of controller */ + + int base; /* I/O port base */ + int irq; /* Interrupt */ + int dma; /* DMA channel */ + + struct tasklet_struct card_tasklet; /* Tasklet structures */ + struct tasklet_struct fifo_tasklet; + struct tasklet_struct crc_tasklet; + struct tasklet_struct timeout_tasklet; + struct tasklet_struct finish_tasklet; + struct tasklet_struct block_tasklet; +}; |