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/* $OpenBSD: dma.h,v 1.4 1997/07/21 11:26:10 pefo Exp $ */
/*
* Copyright (c) 1996 Per Fogelstrom
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed under OpenBSD by
* Per Fogelstrom.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
extern vm_map_t phys_map;
/*
* Little endian mips uses bounce buffer so flush
* for dma is not requiered.
*/
#ifdef MIPSEL
#define ASC_NOFLUSH
#endif
/*
* Structure used to control dma.
*/
typedef struct dma_softc {
struct device sc_dev; /* use as a device */
struct esp_softc *sc_esp;
int dma_ch;
vm_offset_t dma_va; /* Viritual address for transfer */
vm_offset_t req_va; /* Original request va */
int req_size; /* Request size */
int mode; /* Mode register value and direction */
int sc_active; /* Active flag */
char **sc_dmaaddr; /* Pointer to dma address in dev */
int *sc_dmalen; /* Pointer to len counter in dev */
} dma_softc_t;
#define DMA_TO_DEV 0
#define DMA_FROM_DEV 1
#define DMA_CH0 0
#define DMA_CH1 1
#define DMA_RESET(r)
#if 0
#define DMA_START(a, b, c, d) \
{ \
int dcmd; \
int xcmd; \
int pa; \
int sz; \
if((vm_offset_t)(b) < VM_MIN_KERNEL_ADDRESS) { \
pa = CACHED_TO_PHYS(b); \
} \
else { \
pa = pmap_extract(vm_map_pmap(phys_map), (vm_offset_t)(b));\
} \
sz = c; \
if(sz + (pa & (NBPG - 1)) > NBPG) { \
sz = NBPG - (pa & (NBPG - 1)); \
} \
dcmd = ((d) == DMA_FROM_DEV) ? 0x30 : 0x10; \
if((a)->dma_ch == DMA_CH0) { \
out32(R3715_DMA_ADR0, pa); \
out32(R3715_DMA_CNT0, sz - 1); \
xcmd = ~0x30; \
} \
else { \
out32(R3715_DMA_ADR1, pa); \
out32(R3715_DMA_CNT1, sz - 1); \
dcmd = dcmd << 6; \
xcmd = ~(0x30 << 6); \
} \
dcmd |= (1 << 26); \
out32(R3715_IO_TIMING, (in32(R3715_IO_TIMING) & xcmd) | dcmd);\
}
#else
#define DMA_START(a, b, c, d) \
{ \
int dcmd; \
int xcmd; \
int pa; \
int sz; \
pa = CACHED_TO_PHYS(dma_buffer); \
(a)->req_va = (vm_offset_t)(b); \
(a)->req_size = c; \
(a)->mode = d; \
sz = c; \
if((d) == DMA_TO_DEV) { \
int *_p = (int *)PHYS_TO_UNCACHED(pa); \
int *_v = (int *)b; \
int _n = sz; \
if(_n) { \
copynswap(_v, _p, _n); \
} \
} \
dcmd = ((d) == DMA_FROM_DEV) ? 0x30 : 0x10; \
if((a)->dma_ch == DMA_CH0) { \
out32(R3715_DMA_ADR0, pa); \
out32(R3715_DMA_CNT0, sz - 1); \
xcmd = ~0x30; \
} \
else { \
out32(R3715_DMA_ADR1, pa); \
out32(R3715_DMA_CNT1, sz - 1); \
dcmd = dcmd << 6; \
xcmd = ~(0x30 << 6); \
} \
dcmd |= (1 << 26); \
/* Switch direction before enable */ \
out32(R3715_IO_TIMING, (in32(R3715_IO_TIMING) & xcmd) | \
(dcmd & ~0x410)); \
(void)in16(RISC_STATUS); \
out32(R3715_IO_TIMING, (in32(R3715_IO_TIMING) & xcmd) | dcmd);\
}
#endif
#define DMA_MAP(a, b, c, d)
#define DMA_INTR(r)
#define DMA_DRAIN(r)
#define DMA_END(c) \
{ \
int resudial; \
if((c)->dma_ch == DMA_CH0) { \
out32(R3715_IO_TIMING, in32(R3715_IO_TIMING) & ~0x10); \
resudial = in32(R3715_DMA_CNT0); \
} \
else { \
out32(R3715_IO_TIMING, in32(R3715_IO_TIMING) & ~0x400); \
resudial = in32(R3715_DMA_CNT1); \
} \
if(resudial) \
resudial++; \
if((c)->mode == DMA_FROM_DEV) { \
int *_v = (int *)(c)->req_va; \
int *_p = (int *)PHYS_TO_UNCACHED(CACHED_TO_PHYS(dma_buffer)); \
int _n = (c)->req_size - resudial; \
if(_n) { \
copynswap(_p, _v, _n); \
} \
} \
}
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