diff options
| -rw-r--r-- | drivers/char/tpm/tpm.h | 6 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_atmel.c | 108 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_atmel.h | 129 |
3 files changed, 171 insertions, 72 deletions
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 9293bcc4dc6..ad51c653803 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -50,7 +50,11 @@ struct tpm_vendor_specific { u8 req_complete_mask; u8 req_complete_val; u8 req_canceled; - u16 base; /* TPM base address */ + void __iomem *iobase; /* ioremapped address */ + unsigned long base; /* TPM base address */ + + int region_size; + int have_region; int (*recv) (struct tpm_chip *, u8 *, size_t); int (*send) (struct tpm_chip *, u8 *, size_t); diff --git a/drivers/char/tpm/tpm_atmel.c b/drivers/char/tpm/tpm_atmel.c index 32e01450c42..deb4b5c8091 100644 --- a/drivers/char/tpm/tpm_atmel.c +++ b/drivers/char/tpm/tpm_atmel.c @@ -19,14 +19,8 @@ * */ -#include <linux/platform_device.h> #include "tpm.h" - -/* Atmel definitions */ -enum tpm_atmel_addr { - TPM_ATMEL_BASE_ADDR_LO = 0x08, - TPM_ATMEL_BASE_ADDR_HI = 0x09 -}; +#include "tpm_atmel.h" /* write status bits */ enum tpm_atmel_write_status { @@ -53,13 +47,13 @@ static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count) return -EIO; for (i = 0; i < 6; i++) { - status = inb(chip->vendor->base + 1); + status = atmel_getb(chip, 1); if ((status & ATML_STATUS_DATA_AVAIL) == 0) { dev_err(chip->dev, "error reading header\n"); return -EIO; } - *buf++ = inb(chip->vendor->base); + *buf++ = atmel_getb(chip, 0); } /* size of the data received */ @@ -70,7 +64,7 @@ static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count) dev_err(chip->dev, "Recv size(%d) less than available space\n", size); for (; i < size; i++) { /* clear the waiting data anyway */ - status = inb(chip->vendor->base + 1); + status = atmel_getb(chip, 1); if ((status & ATML_STATUS_DATA_AVAIL) == 0) { dev_err(chip->dev, "error reading data\n"); @@ -82,17 +76,17 @@ static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count) /* read all the data available */ for (; i < size; i++) { - status = inb(chip->vendor->base + 1); + status = atmel_getb(chip, 1); if ((status & ATML_STATUS_DATA_AVAIL) == 0) { dev_err(chip->dev, "error reading data\n"); return -EIO; } - *buf++ = inb(chip->vendor->base); + *buf++ = atmel_getb(chip, 0); } /* make sure data available is gone */ - status = inb(chip->vendor->base + 1); + status = atmel_getb(chip, 1); if (status & ATML_STATUS_DATA_AVAIL) { dev_err(chip->dev, "data available is stuck\n"); return -EIO; @@ -108,7 +102,7 @@ static int tpm_atml_send(struct tpm_chip *chip, u8 *buf, size_t count) dev_dbg(chip->dev, "tpm_atml_send:\n"); for (i = 0; i < count; i++) { dev_dbg(chip->dev, "%d 0x%x(%d)\n", i, buf[i], buf[i]); - outb(buf[i], chip->vendor->base); + atmel_putb(buf[i], chip, 0); } return count; @@ -116,12 +110,12 @@ static int tpm_atml_send(struct tpm_chip *chip, u8 *buf, size_t count) static void tpm_atml_cancel(struct tpm_chip *chip) { - outb(ATML_STATUS_ABORT, chip->vendor->base + 1); + atmel_putb(ATML_STATUS_ABORT, chip, 1); } static u8 tpm_atml_status(struct tpm_chip *chip) { - return inb(chip->vendor->base + 1); + return atmel_getb(chip, 1); } static struct file_operations atmel_ops = { @@ -162,12 +156,16 @@ static struct tpm_vendor_specific tpm_atmel = { static struct platform_device *pdev; -static void __devexit tpm_atml_remove(struct device *dev) +static void atml_plat_remove(void) { - struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_chip *chip = dev_get_drvdata(&pdev->dev); + if (chip) { - release_region(chip->vendor->base, 2); + if (chip->vendor->have_region) + atmel_release_region(chip->vendor->base, chip->vendor->region_size); + atmel_put_base_addr(chip->vendor); tpm_remove_hardware(chip->dev); + platform_device_unregister(pdev); } } @@ -182,72 +180,40 @@ static struct device_driver atml_drv = { static int __init init_atmel(void) { int rc = 0; - int lo, hi; driver_register(&atml_drv); - lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO); - hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI); - - tpm_atmel.base = (hi<<8)|lo; - - /* verify that it is an Atmel part */ - if (tpm_read_index(TPM_ADDR, 4) != 'A' || tpm_read_index(TPM_ADDR, 5) != 'T' - || tpm_read_index(TPM_ADDR, 6) != 'M' || tpm_read_index(TPM_ADDR, 7) != 'L') { - return -ENODEV; - } - - /* verify chip version number is 1.1 */ - if ( (tpm_read_index(TPM_ADDR, 0x00) != 0x01) || - (tpm_read_index(TPM_ADDR, 0x01) != 0x01 )) - return -ENODEV; - - pdev = kzalloc(sizeof(struct platform_device), GFP_KERNEL); - if ( !pdev ) - return -ENOMEM; - - pdev->name = "tpm_atmel0"; - pdev->id = -1; - pdev->num_resources = 0; - pdev->dev.release = tpm_atml_remove; - pdev->dev.driver = &atml_drv; - - if ((rc = platform_device_register(pdev)) < 0) { - kfree(pdev); - pdev = NULL; - return rc; + if (atmel_get_base_addr(&tpm_atmel) != 0) { + rc = -ENODEV; + goto err_unreg_drv; } - if (request_region(tpm_atmel.base, 2, "tpm_atmel0") == NULL ) { - platform_device_unregister(pdev); - kfree(pdev); - pdev = NULL; - return -EBUSY; - } + tpm_atmel.have_region = (atmel_request_region( tpm_atmel.base, tpm_atmel.region_size, "tpm_atmel0") == NULL) ? 0 : 1; - if ((rc = tpm_register_hardware(&pdev->dev, &tpm_atmel)) < 0) { - release_region(tpm_atmel.base, 2); - platform_device_unregister(pdev); - kfree(pdev); - pdev = NULL; - return rc; + if (IS_ERR(pdev = platform_device_register_simple("tpm_atmel", -1, NULL, 0 ))) { + rc = PTR_ERR(pdev); + goto err_rel_reg; } - dev_info(&pdev->dev, "Atmel TPM 1.1, Base Address: 0x%x\n", - tpm_atmel.base); + if ((rc = tpm_register_hardware(&pdev->dev, &tpm_atmel)) < 0) + goto err_unreg_dev; return 0; + +err_unreg_dev: + platform_device_unregister(pdev); +err_rel_reg: + if (tpm_atmel.have_region) + atmel_release_region(tpm_atmel.base, tpm_atmel.region_size); + atmel_put_base_addr(&tpm_atmel); +err_unreg_drv: + driver_unregister(&atml_drv); + return rc; } static void __exit cleanup_atmel(void) { - if (pdev) { - tpm_atml_remove(&pdev->dev); - platform_device_unregister(pdev); - kfree(pdev); - pdev = NULL; - } - driver_unregister(&atml_drv); + atml_plat_remove(); } module_init(init_atmel); diff --git a/drivers/char/tpm/tpm_atmel.h b/drivers/char/tpm/tpm_atmel.h new file mode 100644 index 00000000000..3c5b9a8d1c4 --- /dev/null +++ b/drivers/char/tpm/tpm_atmel.h @@ -0,0 +1,129 @@ +/* + * Copyright (C) 2005 IBM Corporation + * + * Authors: + * Kylene Hall <kjhall@us.ibm.com> + * + * Maintained by: <tpmdd_devel@lists.sourceforge.net> + * + * Device driver for TCG/TCPA TPM (trusted platform module). + * Specifications at www.trustedcomputinggroup.org + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + * + * These difference are required on power because the device must be + * discovered through the device tree and iomap must be used to get + * around the need for holes in the io_page_mask. This does not happen + * automatically because the tpm is not a normal pci device and lives + * under the root node. + * + */ + +#ifdef CONFIG_PPC64 +#define atmel_getb(chip, offset) readb(chip->vendor->iobase + offset); +#define atmel_putb(val, chip, offset) writeb(val, chip->vendor->iobase + offset) +#define atmel_request_region request_mem_region +#define atmel_release_region release_mem_region +static inline void atmel_put_base_addr(struct tpm_vendor_specific *vendor) +{ + iounmap(vendor->iobase); +} + +static int atmel_get_base_addr(struct tpm_vendor_specific *vendor) +{ + struct device_node *dn; + unsigned long address, size; + unsigned int *reg; + int reglen; + int naddrc; + int nsizec; + + dn = of_find_node_by_name(NULL, "tpm"); + + if (!dn) + return 1; + + if (!device_is_compatible(dn, "AT97SC3201")) { + of_node_put(dn); + return 1; + } + + reg = (unsigned int *) get_property(dn, "reg", ®len); + naddrc = prom_n_addr_cells(dn); + nsizec = prom_n_size_cells(dn); + + of_node_put(dn); + + + if (naddrc == 2) + address = ((unsigned long) reg[0] << 32) | reg[1]; + else + address = reg[0]; + + if (nsizec == 2) + size = + ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1]; + else + size = reg[naddrc]; + + vendor->base = address; + vendor->region_size = size; + vendor->iobase = ioremap(address, size); + return 0; +} +#else +#define atmel_getb(chip, offset) inb(chip->vendor->base + offset) +#define atmel_putb(val, chip, offset) outb(val, chip->vendor->base + offset) +#define atmel_request_region request_region +#define atmel_release_region release_region +/* Atmel definitions */ +enum tpm_atmel_addr { + TPM_ATMEL_BASE_ADDR_LO = 0x08, + TPM_ATMEL_BASE_ADDR_HI = 0x09 +}; + +/* Verify this is a 1.1 Atmel TPM */ +static int atmel_verify_tpm11(void) +{ + + /* verify that it is an Atmel part */ + if (tpm_read_index(TPM_ADDR, 4) != 'A' || + tpm_read_index(TPM_ADDR, 5) != 'T' || + tpm_read_index(TPM_ADDR, 6) != 'M' || + tpm_read_index(TPM_ADDR, 7) != 'L') + return 1; + + /* query chip for its version number */ + if (tpm_read_index(TPM_ADDR, 0x00) != 1 || + tpm_read_index(TPM_ADDR, 0x01) != 1) + return 1; + + /* This is an atmel supported part */ + return 0; +} + +static inline void atmel_put_base_addr(struct tpm_vendor_specific *vendor) +{ +} + +/* Determine where to talk to device */ +static unsigned long atmel_get_base_addr(struct tpm_vendor_specific + *vendor) +{ + int lo, hi; + + if (atmel_verify_tpm11() != 0) + return 1; + + lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO); + hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI); + + vendor->base = (hi << 8) | lo; + vendor->region_size = 2; + + return 0; +} +#endif |