2  *  linux/arch/arm/mach-rpc/dma.c
15 #include <linux/dma-mapping.h>
50 #define ENDA	(IOMD_IO0ENDA - IOMD_IO0CURA)
51 #define CURB	(IOMD_IO0CURB - IOMD_IO0CURA)
52 #define ENDB	(IOMD_IO0ENDB - IOMD_IO0CURA)
53 #define CR	(IOMD_IO0CR - IOMD_IO0CURA)
54 #define ST	(IOMD_IO0ST - IOMD_IO0CURA)
56 static void iomd_get_next_sg(struct scatterlist *sg, struct iomd_dma *idma)  in iomd_get_next_sg()  argument
60 	if (idma->dma.sg) {  in iomd_get_next_sg()
61 		sg->dma_address = idma->dma_addr;  in iomd_get_next_sg()
62 		offset = sg->dma_address & ~PAGE_MASK;  in iomd_get_next_sg()
64 		end = offset + idma->dma_len;  in iomd_get_next_sg()
72 		sg->length = end - TRANSFER_SIZE;  in iomd_get_next_sg()
74 		idma->dma_len -= end - offset;  in iomd_get_next_sg()
75 		idma->dma_addr += end - offset;  in iomd_get_next_sg()
77 		if (idma->dma_len == 0) {  in iomd_get_next_sg()
78 			if (idma->dma.sgcount > 1) {  in iomd_get_next_sg()
79 				idma->dma.sg = sg_next(idma->dma.sg);  in iomd_get_next_sg()
80 				idma->dma_addr = idma->dma.sg->dma_address;  in iomd_get_next_sg()
81 				idma->dma_len = idma->dma.sg->length;  in iomd_get_next_sg()
82 				idma->dma.sgcount--;  in iomd_get_next_sg()
84 				idma->dma.sg = NULL;  in iomd_get_next_sg()
90 		sg->dma_address = 0;  in iomd_get_next_sg()
91 		sg->length = 0;  in iomd_get_next_sg()
94 	sg->length |= flags;  in iomd_get_next_sg()
99 	struct iomd_dma *idma = dev_id;  in iomd_dma_handle()  local
100 	unsigned long base = idma->base;  in iomd_dma_handle()
109 		if ((idma->state ^ status) & DMA_ST_AB)  in iomd_dma_handle()
110 			iomd_get_next_sg(&idma->cur_sg, idma);  in iomd_dma_handle()
115 			iomd_writel(idma->cur_sg.dma_address, base + CURA);  in iomd_dma_handle()
116 			iomd_writel(idma->cur_sg.length, base + ENDA);  in iomd_dma_handle()
117 			idma->state = DMA_ST_AB;  in iomd_dma_handle()
122 			iomd_writel(idma->cur_sg.dma_address, base + CURB);  in iomd_dma_handle()
123 			iomd_writel(idma->cur_sg.length, base + ENDB);  in iomd_dma_handle()
124 			idma->state = 0;  in iomd_dma_handle()
129 		    idma->cur_sg.length == (DMA_END_S|DMA_END_L))  in iomd_dma_handle()
133 	idma->state = ~DMA_ST_AB;  in iomd_dma_handle()
141 	struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);  in iomd_request_dma()  local
143 	return request_irq(idma->irq, iomd_dma_handle,  in iomd_request_dma()
144 			   0, idma->dma.device_id, idma);  in iomd_request_dma()
149 	struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);  in iomd_free_dma()  local
151 	free_irq(idma->irq, idma);  in iomd_free_dma()
156 	struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);  in iomd_enable_dma()  local
157 	unsigned long dma_base = idma->base;  in iomd_enable_dma()
160 	if (idma->dma.invalid) {  in iomd_enable_dma()
161 		idma->dma.invalid = 0;  in iomd_enable_dma()
164 		 * Cope with ISA-style drivers which expect cache  in iomd_enable_dma()
167 		if (!idma->dma.sg) {  in iomd_enable_dma()
168 			idma->dma.sg = &idma->dma.buf;  in iomd_enable_dma()
169 			idma->dma.sgcount = 1;  in iomd_enable_dma()
170 			idma->dma.buf.length = idma->dma.count;  in iomd_enable_dma()
171 			idma->dma.buf.dma_address = dma_map_single(NULL,  in iomd_enable_dma()
172 				idma->dma.addr, idma->dma.count,  in iomd_enable_dma()
173 				idma->dma.dma_mode == DMA_MODE_READ ?  in iomd_enable_dma()
177 		idma->dma_addr = idma->dma.sg->dma_address;  in iomd_enable_dma()
178 		idma->dma_len = idma->dma.sg->length;  in iomd_enable_dma()
181 		idma->state = DMA_ST_AB;  in iomd_enable_dma()
184 	if (idma->dma.dma_mode == DMA_MODE_READ)  in iomd_enable_dma()
188 	enable_irq(idma->irq);  in iomd_enable_dma()
193 	struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);  in iomd_disable_dma()  local
194 	unsigned long dma_base = idma->base;  in iomd_disable_dma()
198 	if (idma->state != ~DMA_ST_AB)  in iomd_disable_dma()
199 		disable_irq(idma->irq);  in iomd_disable_dma()
271 	if (fdma->dma.sg)  in floppy_enable_dma()
274 	if (fdma->dma.dma_mode == DMA_MODE_READ) {  in floppy_enable_dma()
277 		fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;  in floppy_enable_dma()
281 		fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;  in floppy_enable_dma()
284 	regs.ARM_r9  = fdma->dma.count;  in floppy_enable_dma()
285 	regs.ARM_r10 = (unsigned long)fdma->dma.addr;  in floppy_enable_dma()
295 	enable_fiq(fdma->fiq);  in floppy_enable_dma()
301 	disable_fiq(fdma->fiq);  in floppy_disable_dma()
320  * This is virtual DMA - we don't need anything here.