+++ /dev/null
-/*
- Interface for DMA routines on DOS
- Copyright (C) 1999 by Andrew Zabolotny, <bit@eltech.ru>
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
-#ifndef __DOSDMA_H__
-#define __DOSDMA_H__
-
-#include <pc.h>
-
-#define DMA1_BASE 0x00 /* 8 bit slave DMA, channels 0..3 */
-#define DMA2_BASE 0xC0 /* 16 bit master DMA, ch 4(=slave input)..7 */
-
-#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_SIZE_0 0x01 /* DMA transfer size registers */
-#define DMA_SIZE_1 0x03
-#define DMA_SIZE_2 0x05
-#define DMA_SIZE_3 0x07
-#define DMA_SIZE_4 0xC2
-#define DMA_SIZE_5 0xC6
-#define DMA_SIZE_6 0xCA
-#define DMA_SIZE_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_MODE_AUTOINIT 0x10 /* Auto-init mode bit */
-#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 */
-
-/* Indexable specific DMA registers */
-typedef struct __dma_regs_s {
- unsigned char addr; /* DMA transfer address register */
- unsigned char page; /* DMA page register */
- unsigned char size; /* DMA transfer size register */
- unsigned char mask; /* DMA mask/unmask register */
- unsigned char flip; /* DMA flip-flop reset register */
- unsigned char mode; /* DMA mode register */
-} __dma_regs;
-
-extern __dma_regs dma[8];
-
-/* Enable a specific DMA channel */
-static inline void dma_enable(unsigned int channel)
-{
- outportb(dma[channel].mask, channel & 3);
-}
-
-/* Disable a specific DMA channel */
-static inline void dma_disable(unsigned int channel)
-{
- outportb(dma[channel].mask, (channel & 3) | 0x04);
-}
-
-/* Clear the 'DMA Flip Flop' flag */
-static inline void dma_clear_ff(unsigned int channel)
-{
- outportb(dma[channel].flip, 0);
-}
-
-/* Set mode for a specific DMA channel */
-static inline void dma_set_mode(unsigned int channel, char mode)
-{
- outportb(dma[channel].mode, mode | (channel & 3));
-}
-
-/* Set DMA page register */
-static inline void dma_set_page(unsigned int channel, char page)
-{
- if (channel > 3)
- page &= 0xfe;
- outportb(dma[channel].page, page);
-}
-
-/*
- Set transfer address & page bits for specific DMA channel.
- Assumes dma flipflop is clear.
-*/
-static inline void dma_set_addr(unsigned int channel, unsigned int address)
-{
- unsigned char dma_reg = dma[channel].addr;
- dma_set_page(channel, address >> 16);
- if (channel <= 3) {
- outportb(dma_reg, (address) & 0xff);
- outportb(dma_reg, (address >> 8) & 0xff);
- } else {
- outportb(dma_reg, (address >> 1) & 0xff);
- outportb(dma_reg, (address >> 9) & 0xff);
- }
-}
-
-/*
- Set transfer size for a specific DMA channel.
- Assumes dma flip-flop is clear.
-*/
-static inline void dma_set_count(unsigned int channel, unsigned int count)
-{
- unsigned char dma_reg = dma[channel].size;
- count--; /* number of DMA transfers is bigger by one */
- if (channel > 3)
- count >>= 1;
- outportb(dma_reg, (count) & 0xff);
- outportb(dma_reg, (count >> 8) & 0xff);
-}
-
-/*
- Query the number of bytes left to transfer.
- Assumes DMA flip-flop is clear.
-*/
-static inline int dma_get_count(unsigned int channel)
-{
- unsigned char dma_reg = dma[channel].size;
-
- /* using short to get 16-bit wrap around */
- unsigned short count;
- count = inportb(dma_reg);
- count |= inportb(dma_reg) << 8;
- count++;
- return (channel <= 3) ? count : (count << 1);
-}
-
-typedef struct dma_buffer_s {
- unsigned char *linear; /* Linear address */
- unsigned long physical; /* Physical address */
- unsigned long size; /* Buffer size */
- unsigned short selector; /* The selector assigned to this memory */
- unsigned char channel; /* The DMA channel */
-} dma_buffer;
-
-/* Allocate a block of memory suitable for using as a DMA buffer */
-extern dma_buffer *dma_allocate(unsigned int channel, unsigned int size);
-/* Deallocate a DMA buffer */
-extern void dma_free(dma_buffer * buffer);
-/* Start DMA transfer to or from given buffer */
-extern void dma_start(dma_buffer * buffer, unsigned long count,
- unsigned char mode);
-
-#endif /* __DOSDMA_H__ */
-
-/* ex:set ts=4: */
projects / dosdemo / blobdiff