1 // SPDX-License-Identifier: GPL-2.0-only
3  *  Copyright (C) 1999-2000 Russell King
11  *   arch/arm/kernel/dma-ebsa285.c
14 #include <linux/dma-map-ops.h>
17 #include <linux/dma-mapping.h>
44 static int isa_get_dma_residue(unsigned int chan, dma_t *dma)  in isa_get_dma_residue()  argument
46 	unsigned int io_port = isa_dma_port[chan][ISA_DMA_COUNT];  in isa_get_dma_residue()
52 	return chan < 4 ? count : (count << 1);  in isa_get_dma_residue()
61 static void isa_enable_dma(unsigned int chan, dma_t *dma)  in isa_enable_dma()  argument
63 	if (dma->invalid) {  in isa_enable_dma()
68 		mode = (chan & 3) | dma->dma_mode;  in isa_enable_dma()
69 		switch (dma->dma_mode & DMA_MODE_MASK) {  in isa_enable_dma()
87 		if (!dma->sg) {  in isa_enable_dma()
89 			 * Cope with ISA-style drivers which expect cache  in isa_enable_dma()
92 			dma->sg = &dma->buf;  in isa_enable_dma()
93 			dma->sgcount = 1;  in isa_enable_dma()
94 			dma->buf.length = dma->count;  in isa_enable_dma()
95 			dma->buf.dma_address = dma_map_single(&isa_dma_dev,  in isa_enable_dma()
96 				dma->addr, dma->count,  in isa_enable_dma()
100 		address = dma->buf.dma_address;  in isa_enable_dma()
101 		length  = dma->buf.length - 1;  in isa_enable_dma()
103 		outb(address >> 16, isa_dma_port[chan][ISA_DMA_PGLO]);  in isa_enable_dma()
104 		outb(address >> 24, isa_dma_port[chan][ISA_DMA_PGHI]);  in isa_enable_dma()
106 		if (chan >= 4) {  in isa_enable_dma()
111 		outb(0, isa_dma_port[chan][ISA_DMA_CLRFF]);  in isa_enable_dma()
113 		outb(address, isa_dma_port[chan][ISA_DMA_ADDR]);  in isa_enable_dma()
114 		outb(address >> 8, isa_dma_port[chan][ISA_DMA_ADDR]);  in isa_enable_dma()
116 		outb(length, isa_dma_port[chan][ISA_DMA_COUNT]);  in isa_enable_dma()
117 		outb(length >> 8, isa_dma_port[chan][ISA_DMA_COUNT]);  in isa_enable_dma()
119 		outb(mode, isa_dma_port[chan][ISA_DMA_MODE]);  in isa_enable_dma()
120 		dma->invalid = 0;  in isa_enable_dma()
122 	outb(chan & 3, isa_dma_port[chan][ISA_DMA_MASK]);  in isa_enable_dma()
125 static void isa_disable_dma(unsigned int chan, dma_t *dma)  in isa_disable_dma()  argument
127 	outb(chan | 4, isa_dma_port[chan][ISA_DMA_MASK]);  in isa_disable_dma()
138 	.name	= "dma1",
142 	.name	= "dma low page",
146 	.name	= "dma2",
150 	.name	= "dma high page",
178 		unsigned int chan, i;  in isa_dma_init()  local
180 		for (chan = 0; chan < 8; chan++) {  in isa_dma_init()
181 			isa_dma[chan].d_ops = &isa_dma_ops;  in isa_dma_init()
182 			isa_disable_dma(chan, NULL);  in isa_dma_init()
216 		for (chan = 0; chan < 8; chan++) {  in isa_dma_init()
217 			int ret = isa_dma_add(chan, &isa_dma[chan]);  in isa_dma_init()
220 				       chan, ret);  in isa_dma_init()