2 * arch/sh64/kernel/dma.c
4 * DMA routines for the SH-5 DMAC.
6 * Copyright (C) 2003 Paul Mundt
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/types.h>
16 #include <linux/irq.h>
17 #include <linux/spinlock.h>
19 #include <asm/hardware.h>
21 #include <asm/signal.h>
22 #include <asm/errno.h>
26 unsigned long dev_addr;
27 unsigned long mem_addr;
33 static dma_info_t dma_info[MAX_DMA_CHANNELS];
34 static DEFINE_SPINLOCK(dma_spin_lock);
36 /* arch/sh64/kernel/irq_intc.c */
37 extern void make_intc_irq(unsigned int irq);
40 #define DMA_IRQ_DMTE0 18
41 #define DMA_IRQ_DERR 22
43 #define DMAC_COMMON_BASE (dmac_base + 0x08)
44 #define DMAC_SAR_BASE (dmac_base + 0x10)
45 #define DMAC_DAR_BASE (dmac_base + 0x18)
46 #define DMAC_COUNT_BASE (dmac_base + 0x20)
47 #define DMAC_CTRL_BASE (dmac_base + 0x28)
48 #define DMAC_STATUS_BASE (dmac_base + 0x30)
50 #define DMAC_SAR(n) (DMAC_SAR_BASE + ((n) * 0x28))
51 #define DMAC_DAR(n) (DMAC_DAR_BASE + ((n) * 0x28))
52 #define DMAC_COUNT(n) (DMAC_COUNT_BASE + ((n) * 0x28))
53 #define DMAC_CTRL(n) (DMAC_CTRL_BASE + ((n) * 0x28))
54 #define DMAC_STATUS(n) (DMAC_STATUS_BASE + ((n) * 0x28))
56 /* DMAC.COMMON Bit Definitions */
57 #define DMAC_COMMON_PR 0x00000001 /* Priority */
58 /* Bits 1-2 Reserved */
59 #define DMAC_COMMON_ME 0x00000008 /* Master Enable */
60 #define DMAC_COMMON_NMI 0x00000010 /* NMI Flag */
61 /* Bits 5-6 Reserved */
62 #define DMAC_COMMON_ER 0x00000780 /* Error Response */
63 #define DMAC_COMMON_AAE 0x00007800 /* Address Alignment Error */
64 /* Bits 15-63 Reserved */
66 /* DMAC.SAR Bit Definitions */
67 #define DMAC_SAR_ADDR 0xffffffff /* Source Address */
69 /* DMAC.DAR Bit Definitions */
70 #define DMAC_DAR_ADDR 0xffffffff /* Destination Address */
72 /* DMAC.COUNT Bit Definitions */
73 #define DMAC_COUNT_CNT 0xffffffff /* Transfer Count */
75 /* DMAC.CTRL Bit Definitions */
76 #define DMAC_CTRL_TS 0x00000007 /* Transfer Size */
77 #define DMAC_CTRL_SI 0x00000018 /* Source Increment */
78 #define DMAC_CTRL_DI 0x00000060 /* Destination Increment */
79 #define DMAC_CTRL_RS 0x00000780 /* Resource Select */
80 #define DMAC_CTRL_IE 0x00000800 /* Interrupt Enable */
81 #define DMAC_CTRL_TE 0x00001000 /* Transfer Enable */
82 /* Bits 15-63 Reserved */
84 /* DMAC.STATUS Bit Definitions */
85 #define DMAC_STATUS_TE 0x00000001 /* Transfer End */
86 #define DMAC_STATUS_AAE 0x00000002 /* Address Alignment Error */
87 /* Bits 2-63 Reserved */
89 static unsigned long dmac_base;
91 void set_dma_count(unsigned int chan, unsigned int count);
92 void set_dma_addr(unsigned int chan, unsigned int addr);
94 static irqreturn_t dma_mte(int irq, void *dev_id, struct pt_regs *regs)
96 unsigned int chan = irq - DMA_IRQ_DMTE0;
97 dma_info_t *info = dma_info + chan;
100 if (info->mode & DMA_MODE_WRITE) {
101 sh64_out64(info->mem_addr & DMAC_SAR_ADDR, DMAC_SAR(chan));
103 sh64_out64(info->mem_addr & DMAC_DAR_ADDR, DMAC_DAR(chan));
106 set_dma_count(chan, info->count);
108 /* Clear the TE bit */
109 status = sh64_in64(DMAC_STATUS(chan));
110 status &= ~DMAC_STATUS_TE;
111 sh64_out64(status, DMAC_STATUS(chan));
116 static struct irqaction irq_dmte = {
118 .flags = IRQF_DISABLED,
122 static irqreturn_t dma_err(int irq, void *dev_id, struct pt_regs *regs)
127 printk(KERN_NOTICE "DMAC: Got a DMA Error!\n");
129 tmp = sh64_in64(DMAC_COMMON_BASE);
131 /* Check for the type of error */
132 if ((chan = tmp & DMAC_COMMON_AAE)) {
133 /* It's an address alignment error.. */
134 printk(KERN_NOTICE "DMAC: Alignment error on channel %d, ", chan);
136 printk(KERN_NOTICE "SAR: 0x%08llx, DAR: 0x%08llx, COUNT: %lld\n",
137 (sh64_in64(DMAC_SAR(chan)) & DMAC_SAR_ADDR),
138 (sh64_in64(DMAC_DAR(chan)) & DMAC_DAR_ADDR),
139 (sh64_in64(DMAC_COUNT(chan)) & DMAC_COUNT_CNT));
141 } else if ((chan = tmp & DMAC_COMMON_ER)) {
142 /* Something else went wrong.. */
143 printk(KERN_NOTICE "DMAC: Error on channel %d\n", chan);
146 /* Reset the ME bit to clear the interrupt */
147 tmp |= DMAC_COMMON_ME;
148 sh64_out64(tmp, DMAC_COMMON_BASE);
153 static struct irqaction irq_derr = {
155 .flags = IRQF_DISABLED,
159 static inline unsigned long calc_xmit_shift(unsigned int chan)
161 return sh64_in64(DMAC_CTRL(chan)) & 0x03;
164 void setup_dma(unsigned int chan, dma_info_t *info)
166 unsigned int irq = DMA_IRQ_DMTE0 + chan;
167 dma_info_t *dma = dma_info + chan;
170 setup_irq(irq, &irq_dmte);
174 void enable_dma(unsigned int chan)
178 ctrl = sh64_in64(DMAC_CTRL(chan));
179 ctrl |= DMAC_CTRL_TE;
180 sh64_out64(ctrl, DMAC_CTRL(chan));
183 void disable_dma(unsigned int chan)
187 ctrl = sh64_in64(DMAC_CTRL(chan));
188 ctrl &= ~DMAC_CTRL_TE;
189 sh64_out64(ctrl, DMAC_CTRL(chan));
192 void set_dma_mode(unsigned int chan, char mode)
194 dma_info_t *info = dma_info + chan;
198 set_dma_addr(chan, info->mem_addr);
199 set_dma_count(chan, info->count);
202 void set_dma_addr(unsigned int chan, unsigned int addr)
204 dma_info_t *info = dma_info + chan;
205 unsigned long sar, dar;
207 info->mem_addr = addr;
208 sar = (info->mode & DMA_MODE_WRITE) ? info->mem_addr : info->dev_addr;
209 dar = (info->mode & DMA_MODE_WRITE) ? info->dev_addr : info->mem_addr;
211 sh64_out64(sar & DMAC_SAR_ADDR, DMAC_SAR(chan));
212 sh64_out64(dar & DMAC_SAR_ADDR, DMAC_DAR(chan));
215 void set_dma_count(unsigned int chan, unsigned int count)
217 dma_info_t *info = dma_info + chan;
222 tmp = (info->count >> calc_xmit_shift(chan)) & DMAC_COUNT_CNT;
224 sh64_out64(tmp, DMAC_COUNT(chan));
227 unsigned long claim_dma_lock(void)
231 spin_lock_irqsave(&dma_spin_lock, flags);
236 void release_dma_lock(unsigned long flags)
238 spin_unlock_irqrestore(&dma_spin_lock, flags);
241 int get_dma_residue(unsigned int chan)
243 return sh64_in64(DMAC_COUNT(chan) << calc_xmit_shift(chan));
246 int __init init_dma(void)
252 dmac_base = onchip_remap(PHYS_DMAC_BLOCK, 1024, "DMAC");
254 printk(KERN_ERR "Unable to remap DMAC\n");
258 /* Report DMAC.VCR Info */
259 vcr = sh64_get_vcr_info(dmac_base);
260 printk("DMAC: Module ID: 0x%04x, Module version: 0x%04x\n",
261 vcr.mod_id, vcr.mod_vers);
264 tmp = sh64_in64(DMAC_COMMON_BASE);
265 tmp |= DMAC_COMMON_ME;
266 sh64_out64(tmp, DMAC_COMMON_BASE);
268 /* Enable the DMAC Error Interrupt */
269 make_intc_irq(DMA_IRQ_DERR);
270 setup_irq(DMA_IRQ_DERR, &irq_derr);
275 static void __exit exit_dma(void)
277 onchip_unmap(dmac_base);
278 free_irq(DMA_IRQ_DERR, 0);
281 module_init(init_dma);
282 module_exit(exit_dma);
284 MODULE_AUTHOR("Paul Mundt");
285 MODULE_DESCRIPTION("DMA API for SH-5 DMAC");
286 MODULE_LICENSE("GPL");
288 EXPORT_SYMBOL(setup_dma);
289 EXPORT_SYMBOL(claim_dma_lock);
290 EXPORT_SYMBOL(release_dma_lock);
291 EXPORT_SYMBOL(enable_dma);
292 EXPORT_SYMBOL(disable_dma);
293 EXPORT_SYMBOL(set_dma_mode);
294 EXPORT_SYMBOL(set_dma_addr);
295 EXPORT_SYMBOL(set_dma_count);
296 EXPORT_SYMBOL(get_dma_residue);