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-rw-r--r--arch/alpha/include/asm/dma.h376
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diff --git a/arch/alpha/include/asm/dma.h b/arch/alpha/include/asm/dma.h
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--- a/arch/alpha/include/asm/dma.h
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-/*
- * include/asm-alpha/dma.h
- *
- * This is essentially the same as the i386 DMA stuff, as the AlphaPCs
- * use ISA-compatible dma. The only extension is support for high-page
- * registers that allow to set the top 8 bits of a 32-bit DMA address.
- * This register should be written last when setting up a DMA address
- * as this will also enable DMA across 64 KB boundaries.
- */
-
-/* $Id: dma.h,v 1.7 1992/12/14 00:29:34 root Exp root $
- * linux/include/asm/dma.h: 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.
- */
-
-#ifndef _ASM_DMA_H
-#define _ASM_DMA_H
-
-#include <linux/spinlock.h>
-#include <asm/io.h>
-
-#define dma_outb outb
-#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
- *
- * DMA transfers are limited to the lower 16MB of _physical_ memory.
- * 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.
- *
- */
-
-#define MAX_DMA_CHANNELS 8
-
-/*
- ISA DMA limitations on Alpha platforms,
-
- These may be due to SIO (PCI<->ISA bridge) chipset limitation, or
- just a wiring limit.
-*/
-
-/* The maximum address for ISA DMA transfer on Alpha XL, due to an
- hardware SIO limitation, is 64MB.
-*/
-#define ALPHA_XL_MAX_ISA_DMA_ADDRESS 0x04000000UL
-
-/* The maximum address for ISA DMA transfer on RUFFIAN,
- due to an hardware SIO limitation, is 16MB.
-*/
-#define ALPHA_RUFFIAN_MAX_ISA_DMA_ADDRESS 0x01000000UL
-
-/* The maximum address for ISA DMA transfer on SABLE, and some ALCORs,
- due to an hardware SIO chip limitation, is 2GB.
-*/
-#define ALPHA_SABLE_MAX_ISA_DMA_ADDRESS 0x80000000UL
-#define ALPHA_ALCOR_MAX_ISA_DMA_ADDRESS 0x80000000UL
-
-/*
- Maximum address for all the others is the complete 32-bit bus
- address space.
-*/
-#define ALPHA_MAX_ISA_DMA_ADDRESS 0x100000000UL
-
-#ifdef CONFIG_ALPHA_GENERIC
-# define MAX_ISA_DMA_ADDRESS (alpha_mv.max_isa_dma_address)
-#else
-# if defined(CONFIG_ALPHA_XL)
-# define MAX_ISA_DMA_ADDRESS ALPHA_XL_MAX_ISA_DMA_ADDRESS
-# elif defined(CONFIG_ALPHA_RUFFIAN)
-# define MAX_ISA_DMA_ADDRESS ALPHA_RUFFIAN_MAX_ISA_DMA_ADDRESS
-# elif defined(CONFIG_ALPHA_SABLE)
-# define MAX_ISA_DMA_ADDRESS ALPHA_SABLE_MAX_ISA_DMA_ADDRESS
-# elif defined(CONFIG_ALPHA_ALCOR)
-# define MAX_ISA_DMA_ADDRESS ALPHA_ALCOR_MAX_ISA_DMA_ADDRESS
-# else
-# define MAX_ISA_DMA_ADDRESS ALPHA_MAX_ISA_DMA_ADDRESS
-# endif
-#endif
-
-/* If we have the iommu, we don't have any address limitations on DMA.
- Otherwise (Nautilus, RX164), we have to have 0-16 Mb DMA zone
- like i386. */
-#define MAX_DMA_ADDRESS (alpha_mv.mv_pci_tbi ? \
- ~0UL : IDENT_ADDR + 0x01000000)
-
-/* 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 DMA1_EXT_MODE_REG (0x400 | DMA1_MODE_REG)
-
-#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 DMA2_EXT_MODE_REG (0x400 | DMA2_MODE_REG)
-
-#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_PAGE_0 0x87 /* DMA page registers */
-#define DMA_PAGE_1 0x83
-#define DMA_PAGE_2 0x81
-#define DMA_PAGE_3 0x82
-#define DMA_PAGE_5 0x8B
-#define DMA_PAGE_6 0x89
-#define DMA_PAGE_7 0x8A
-
-#define DMA_HIPAGE_0 (0x400 | DMA_PAGE_0)
-#define DMA_HIPAGE_1 (0x400 | DMA_PAGE_1)
-#define DMA_HIPAGE_2 (0x400 | DMA_PAGE_2)
-#define DMA_HIPAGE_3 (0x400 | DMA_PAGE_3)
-#define DMA_HIPAGE_4 (0x400 | DMA_PAGE_4)
-#define DMA_HIPAGE_5 (0x400 | DMA_PAGE_5)
-#define DMA_HIPAGE_6 (0x400 | DMA_PAGE_6)
-#define DMA_HIPAGE_7 (0x400 | DMA_PAGE_7)
-
-#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 */
-#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)
-{
- if (dmanr<=3)
- dma_outb(dmanr, DMA1_MASK_REG);
- 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 extended mode for a specific DMA channel */
-static __inline__ void set_dma_ext_mode(unsigned int dmanr, char ext_mode)
-{
- if (dmanr<=3)
- dma_outb(ext_mode | dmanr, DMA1_EXT_MODE_REG);
- else
- dma_outb(ext_mode | (dmanr&3), DMA2_EXT_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.
- */
-static __inline__ void set_dma_page(unsigned int dmanr, unsigned int pagenr)
-{
- switch(dmanr) {
- case 0:
- dma_outb(pagenr, DMA_PAGE_0);
- dma_outb((pagenr >> 8), DMA_HIPAGE_0);
- break;
- case 1:
- dma_outb(pagenr, DMA_PAGE_1);
- dma_outb((pagenr >> 8), DMA_HIPAGE_1);
- break;
- case 2:
- dma_outb(pagenr, DMA_PAGE_2);
- dma_outb((pagenr >> 8), DMA_HIPAGE_2);
- break;
- case 3:
- dma_outb(pagenr, DMA_PAGE_3);
- dma_outb((pagenr >> 8), DMA_HIPAGE_3);
- break;
- case 5:
- dma_outb(pagenr & 0xfe, DMA_PAGE_5);
- dma_outb((pagenr >> 8), DMA_HIPAGE_5);
- break;
- case 6:
- dma_outb(pagenr & 0xfe, DMA_PAGE_6);
- dma_outb((pagenr >> 8), DMA_HIPAGE_6);
- break;
- case 7:
- dma_outb(pagenr & 0xfe, DMA_PAGE_7);
- dma_outb((pagenr >> 8), DMA_HIPAGE_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 a)
-{
- if (dmanr <= 3) {
- dma_outb( a & 0xff, ((dmanr&3)<<1) + IO_DMA1_BASE );
- dma_outb( (a>>8) & 0xff, ((dmanr&3)<<1) + IO_DMA1_BASE );
- } else {
- dma_outb( (a>>1) & 0xff, ((dmanr&3)<<2) + IO_DMA2_BASE );
- dma_outb( (a>>9) & 0xff, ((dmanr&3)<<2) + IO_DMA2_BASE );
- }
- set_dma_page(dmanr, a>>16); /* set hipage last to enable 32-bit mode */
-}
-
-
-/* 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: */
-extern int request_dma(unsigned int dmanr, const char * device_id); /* reserve a DMA channel */
-extern void free_dma(unsigned int dmanr); /* release it again */
-#define KERNEL_HAVE_CHECK_DMA
-extern int check_dma(unsigned int dmanr);
-
-/* From PCI */
-
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
-
-#endif /* _ASM_DMA_H */