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+#ifndef _ASM_POWERPC_DMA_H
+#define _ASM_POWERPC_DMA_H
+#ifdef __KERNEL__
+
+/*
+ * Defines for using and allocating dma channels.
+ * Written by Hennus Bergman, 1992.
+ * High DMA channel support & info by Hannu Savolainen
+ * and John Boyd, Nov. 1992.
+ * Changes for ppc sound by Christoph Nadig
+ */
+
+/*
+ * Note: Adapted for PowerPC by Gary Thomas
+ * Modified by Cort Dougan <cort@cs.nmt.edu>
+ *
+ * None of this really applies for Power Macintoshes. There is
+ * basically just enough here to get kernel/dma.c to compile.
+ *
+ * There may be some comments or restrictions made here which are
+ * not valid for the PReP platform. Take what you read
+ * with a grain of salt.
+ */
+
+#include <asm/io.h>
+#include <linux/spinlock.h>
+#include <asm/system.h>
+
+#ifndef MAX_DMA_CHANNELS
+#define MAX_DMA_CHANNELS 8
+#endif
+
+/* The maximum address that we can perform a DMA transfer to on this platform */
+/* Doesn't really apply... */
+#define MAX_DMA_ADDRESS (~0UL)
+
+#if !defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI)
+
+#ifdef HAVE_REALLY_SLOW_DMA_CONTROLLER
+#define dma_outb outb_p
+#else
+#define dma_outb outb
+#endif
+
+#define dma_inb inb
+
+/*
+ * NOTES about DMA transfers:
+ *
+ * controller 1: channels 0-3, byte operations, ports 00-1F
+ * controller 2: channels 4-7, word operations, ports C0-DF
+ *
+ * - ALL registers are 8 bits only, regardless of transfer size
+ * - channel 4 is not used - cascades 1 into 2.
+ * - channels 0-3 are byte - addresses/counts are for physical bytes
+ * - channels 5-7 are word - addresses/counts are for physical words
+ * - transfers must not cross physical 64K (0-3) or 128K (5-7) boundaries
+ * - transfer count loaded to registers is 1 less than actual count
+ * - controller 2 offsets are all even (2x offsets for controller 1)
+ * - page registers for 5-7 don't use data bit 0, represent 128K pages
+ * - page registers for 0-3 use bit 0, represent 64K pages
+ *
+ * On PReP, DMA transfers are limited to the lower 16MB of _physical_ memory.
+ * On CHRP, the W83C553F (and VLSI Tollgate?) support full 32 bit addressing.
+ * Note that addresses loaded into registers must be _physical_ addresses,
+ * not logical addresses (which may differ if paging is active).
+ *
+ * Address mapping for channels 0-3:
+ *
+ * A23 ... A16 A15 ... A8 A7 ... A0 (Physical addresses)
+ * | ... | | ... | | ... |
+ * | ... | | ... | | ... |
+ * | ... | | ... | | ... |
+ * P7 ... P0 A7 ... A0 A7 ... A0
+ * | Page | Addr MSB | Addr LSB | (DMA registers)
+ *
+ * Address mapping for channels 5-7:
+ *
+ * A23 ... A17 A16 A15 ... A9 A8 A7 ... A1 A0 (Physical addresses)
+ * | ... | \ \ ... \ \ \ ... \ \
+ * | ... | \ \ ... \ \ \ ... \ (not used)
+ * | ... | \ \ ... \ \ \ ... \
+ * P7 ... P1 (0) A7 A6 ... A0 A7 A6 ... A0
+ * | Page | Addr MSB | Addr LSB | (DMA registers)
+ *
+ * Again, channels 5-7 transfer _physical_ words (16 bits), so addresses
+ * and counts _must_ be word-aligned (the lowest address bit is _ignored_ at
+ * the hardware level, so odd-byte transfers aren't possible).
+ *
+ * Transfer count (_not # bytes_) is limited to 64K, represented as actual
+ * count - 1 : 64K => 0xFFFF, 1 => 0x0000. Thus, count is always 1 or more,
+ * and up to 128K bytes may be transferred on channels 5-7 in one operation.
+ *
+ */
+
+/* 8237 DMA controllers */
+#define IO_DMA1_BASE 0x00 /* 8 bit slave DMA, channels 0..3 */
+#define IO_DMA2_BASE 0xC0 /* 16 bit master DMA, ch 4(=slave input)..7 */
+
+/* DMA controller registers */
+#define DMA1_CMD_REG 0x08 /* command register (w) */
+#define DMA1_STAT_REG 0x08 /* status register (r) */
+#define DMA1_REQ_REG 0x09 /* request register (w) */
+#define DMA1_MASK_REG 0x0A /* single-channel mask (w) */
+#define DMA1_MODE_REG 0x0B /* mode register (w) */
+#define DMA1_CLEAR_FF_REG 0x0C /* clear pointer flip-flop (w) */
+#define DMA1_TEMP_REG 0x0D /* Temporary Register (r) */
+#define DMA1_RESET_REG 0x0D /* Master Clear (w) */
+#define DMA1_CLR_MASK_REG 0x0E /* Clear Mask */
+#define DMA1_MASK_ALL_REG 0x0F /* all-channels mask (w) */
+
+#define DMA2_CMD_REG 0xD0 /* command register (w) */
+#define DMA2_STAT_REG 0xD0 /* status register (r) */
+#define DMA2_REQ_REG 0xD2 /* request register (w) */
+#define DMA2_MASK_REG 0xD4 /* single-channel mask (w) */
+#define DMA2_MODE_REG 0xD6 /* mode register (w) */
+#define DMA2_CLEAR_FF_REG 0xD8 /* clear pointer flip-flop (w) */
+#define DMA2_TEMP_REG 0xDA /* Temporary Register (r) */
+#define DMA2_RESET_REG 0xDA /* Master Clear (w) */
+#define DMA2_CLR_MASK_REG 0xDC /* Clear Mask */
+#define DMA2_MASK_ALL_REG 0xDE /* all-channels mask (w) */
+
+#define DMA_ADDR_0 0x00 /* DMA address registers */
+#define DMA_ADDR_1 0x02
+#define DMA_ADDR_2 0x04
+#define DMA_ADDR_3 0x06
+#define DMA_ADDR_4 0xC0
+#define DMA_ADDR_5 0xC4
+#define DMA_ADDR_6 0xC8
+#define DMA_ADDR_7 0xCC
+
+#define DMA_CNT_0 0x01 /* DMA count registers */
+#define DMA_CNT_1 0x03
+#define DMA_CNT_2 0x05
+#define DMA_CNT_3 0x07
+#define DMA_CNT_4 0xC2
+#define DMA_CNT_5 0xC6
+#define DMA_CNT_6 0xCA
+#define DMA_CNT_7 0xCE
+
+#define DMA_LO_PAGE_0 0x87 /* DMA page registers */
+#define DMA_LO_PAGE_1 0x83
+#define DMA_LO_PAGE_2 0x81
+#define DMA_LO_PAGE_3 0x82
+#define DMA_LO_PAGE_5 0x8B
+#define DMA_LO_PAGE_6 0x89
+#define DMA_LO_PAGE_7 0x8A
+
+#define DMA_HI_PAGE_0 0x487 /* DMA page registers */
+#define DMA_HI_PAGE_1 0x483
+#define DMA_HI_PAGE_2 0x481
+#define DMA_HI_PAGE_3 0x482
+#define DMA_HI_PAGE_5 0x48B
+#define DMA_HI_PAGE_6 0x489
+#define DMA_HI_PAGE_7 0x48A
+
+#define DMA1_EXT_REG 0x40B
+#define DMA2_EXT_REG 0x4D6
+
+#ifndef __powerpc64__
+ /* in arch/ppc/kernel/setup.c -- Cort */
+ extern unsigned int DMA_MODE_WRITE;
+ extern unsigned int DMA_MODE_READ;
+ extern unsigned long ISA_DMA_THRESHOLD;
+#else
+ #define DMA_MODE_READ 0x44 /* I/O to memory, no autoinit, increment, single mode */
+ #define DMA_MODE_WRITE 0x48 /* memory to I/O, no autoinit, increment, single mode */
+#endif
+
+#define DMA_MODE_CASCADE 0xC0 /* pass thru DREQ->HRQ, DACK<-HLDA only */
+
+#define DMA_AUTOINIT 0x10
+
+extern spinlock_t dma_spin_lock;
+
+static __inline__ unsigned long claim_dma_lock(void)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&dma_spin_lock, flags);
+ return flags;
+}
+
+static __inline__ void release_dma_lock(unsigned long flags)
+{
+ spin_unlock_irqrestore(&dma_spin_lock, flags);
+}
+
+/* enable/disable a specific DMA channel */
+static __inline__ void enable_dma(unsigned int dmanr)
+{
+ unsigned char ucDmaCmd = 0x00;
+
+ if (dmanr != 4) {
+ dma_outb(0, DMA2_MASK_REG); /* This may not be enabled */
+ dma_outb(ucDmaCmd, DMA2_CMD_REG); /* Enable group */
+ }
+ if (dmanr <= 3) {
+ dma_outb(dmanr, DMA1_MASK_REG);
+ dma_outb(ucDmaCmd, DMA1_CMD_REG); /* Enable group */
+ } else {
+ dma_outb(dmanr & 3, DMA2_MASK_REG);
+ }
+}
+
+static __inline__ void disable_dma(unsigned int dmanr)
+{
+ if (dmanr <= 3)
+ dma_outb(dmanr | 4, DMA1_MASK_REG);
+ else
+ dma_outb((dmanr & 3) | 4, DMA2_MASK_REG);
+}
+
+/* Clear the 'DMA Pointer Flip Flop'.
+ * Write 0 for LSB/MSB, 1 for MSB/LSB access.
+ * Use this once to initialize the FF to a known state.
+ * After that, keep track of it. :-)
+ * --- In order to do that, the DMA routines below should ---
+ * --- only be used while interrupts are disabled! ---
+ */
+static __inline__ void clear_dma_ff(unsigned int dmanr)
+{
+ if (dmanr <= 3)
+ dma_outb(0, DMA1_CLEAR_FF_REG);
+ else
+ dma_outb(0, DMA2_CLEAR_FF_REG);
+}
+
+/* set mode (above) for a specific DMA channel */
+static __inline__ void set_dma_mode(unsigned int dmanr, char mode)
+{
+ if (dmanr <= 3)
+ dma_outb(mode | dmanr, DMA1_MODE_REG);
+ else
+ dma_outb(mode | (dmanr & 3), DMA2_MODE_REG);
+}
+
+/* Set only the page register bits of the transfer address.
+ * This is used for successive transfers when we know the contents of
+ * the lower 16 bits of the DMA current address register, but a 64k boundary
+ * may have been crossed.
+ */
+static __inline__ void set_dma_page(unsigned int dmanr, int pagenr)
+{
+ switch (dmanr) {
+ case 0:
+ dma_outb(pagenr, DMA_LO_PAGE_0);
+ dma_outb(pagenr >> 8, DMA_HI_PAGE_0);
+ break;
+ case 1:
+ dma_outb(pagenr, DMA_LO_PAGE_1);
+ dma_outb(pagenr >> 8, DMA_HI_PAGE_1);
+ break;
+ case 2:
+ dma_outb(pagenr, DMA_LO_PAGE_2);
+ dma_outb(pagenr >> 8, DMA_HI_PAGE_2);
+ break;
+ case 3:
+ dma_outb(pagenr, DMA_LO_PAGE_3);
+ dma_outb(pagenr >> 8, DMA_HI_PAGE_3);
+ break;
+ case 5:
+ dma_outb(pagenr & 0xfe, DMA_LO_PAGE_5);
+ dma_outb(pagenr >> 8, DMA_HI_PAGE_5);
+ break;
+ case 6:
+ dma_outb(pagenr & 0xfe, DMA_LO_PAGE_6);
+ dma_outb(pagenr >> 8, DMA_HI_PAGE_6);
+ break;
+ case 7:
+ dma_outb(pagenr & 0xfe, DMA_LO_PAGE_7);
+ dma_outb(pagenr >> 8, DMA_HI_PAGE_7);
+ break;
+ }
+}
+
+/* Set transfer address & page bits for specific DMA channel.
+ * Assumes dma flipflop is clear.
+ */
+static __inline__ void set_dma_addr(unsigned int dmanr, unsigned int phys)
+{
+ if (dmanr <= 3) {
+ dma_outb(phys & 0xff,
+ ((dmanr & 3) << 1) + IO_DMA1_BASE);
+ dma_outb((phys >> 8) & 0xff,
+ ((dmanr & 3) << 1) + IO_DMA1_BASE);
+ } else {
+ dma_outb((phys >> 1) & 0xff,
+ ((dmanr & 3) << 2) + IO_DMA2_BASE);
+ dma_outb((phys >> 9) & 0xff,
+ ((dmanr & 3) << 2) + IO_DMA2_BASE);
+ }
+ set_dma_page(dmanr, phys >> 16);
+}
+
+
+/* Set transfer size (max 64k for DMA1..3, 128k for DMA5..7) for
+ * a specific DMA channel.
+ * You must ensure the parameters are valid.
+ * NOTE: from a manual: "the number of transfers is one more
+ * than the initial word count"! This is taken into account.
+ * Assumes dma flip-flop is clear.
+ * NOTE 2: "count" represents _bytes_ and must be even for channels 5-7.
+ */
+static __inline__ void set_dma_count(unsigned int dmanr, unsigned int count)
+{
+ count--;
+ if (dmanr <= 3) {
+ dma_outb(count & 0xff,
+ ((dmanr & 3) << 1) + 1 + IO_DMA1_BASE);
+ dma_outb((count >> 8) & 0xff,
+ ((dmanr & 3) << 1) + 1 + IO_DMA1_BASE);
+ } else {
+ dma_outb((count >> 1) & 0xff,
+ ((dmanr & 3) << 2) + 2 + IO_DMA2_BASE);
+ dma_outb((count >> 9) & 0xff,
+ ((dmanr & 3) << 2) + 2 + IO_DMA2_BASE);
+ }
+}
+
+
+/* Get DMA residue count. After a DMA transfer, this
+ * should return zero. Reading this while a DMA transfer is
+ * still in progress will return unpredictable results.
+ * If called before the channel has been used, it may return 1.
+ * Otherwise, it returns the number of _bytes_ left to transfer.
+ *
+ * Assumes DMA flip-flop is clear.
+ */
+static __inline__ int get_dma_residue(unsigned int dmanr)
+{
+ unsigned int io_port = (dmanr <= 3)
+ ? ((dmanr & 3) << 1) + 1 + IO_DMA1_BASE
+ : ((dmanr & 3) << 2) + 2 + IO_DMA2_BASE;
+
+ /* using short to get 16-bit wrap around */
+ unsigned short count;
+
+ count = 1 + dma_inb(io_port);
+ count += dma_inb(io_port) << 8;
+
+ return (dmanr <= 3) ? count : (count << 1);
+}
+
+/* These are in kernel/dma.c: */
+
+/* reserve a DMA channel */
+extern int request_dma(unsigned int dmanr, const char *device_id);
+/* release it again */
+extern void free_dma(unsigned int dmanr);
+
+#ifdef CONFIG_PCI
+extern int isa_dma_bridge_buggy;
+#else
+#define isa_dma_bridge_buggy (0)
+#endif
+
+#endif /* !defined(CONFIG_PPC_ISERIES) || defined(CONFIG_PCI) */
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_DMA_H */