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-rw-r--r--arch/sh64/kernel/dma.c297
1 files changed, 0 insertions, 297 deletions
diff --git a/arch/sh64/kernel/dma.c b/arch/sh64/kernel/dma.c
deleted file mode 100644
index 32c6f0549bf1..000000000000
--- a/arch/sh64/kernel/dma.c
+++ /dev/null
@@ -1,297 +0,0 @@
1/*
2 * arch/sh64/kernel/dma.c
3 *
4 * DMA routines for the SH-5 DMAC.
5 *
6 * Copyright (C) 2003 Paul Mundt
7 *
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
10 * for more details.
11 */
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>
18#include <linux/mm.h>
19#include <asm/hardware.h>
20#include <asm/dma.h>
21#include <asm/signal.h>
22#include <asm/errno.h>
23#include <asm/io.h>
24
25typedef struct {
26 unsigned long dev_addr;
27 unsigned long mem_addr;
28
29 unsigned int mode;
30 unsigned int count;
31} dma_info_t;
32
33static dma_info_t dma_info[MAX_DMA_CHANNELS];
34static DEFINE_SPINLOCK(dma_spin_lock);
35
36/* arch/sh64/kernel/irq_intc.c */
37extern void make_intc_irq(unsigned int irq);
38
39/* DMAC Interrupts */
40#define DMA_IRQ_DMTE0 18
41#define DMA_IRQ_DERR 22
42
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)
49
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))
55
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 */
65
66/* DMAC.SAR Bit Definitions */
67#define DMAC_SAR_ADDR 0xffffffff /* Source Address */
68
69/* DMAC.DAR Bit Definitions */
70#define DMAC_DAR_ADDR 0xffffffff /* Destination Address */
71
72/* DMAC.COUNT Bit Definitions */
73#define DMAC_COUNT_CNT 0xffffffff /* Transfer Count */
74
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 */
83
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 */
88
89static unsigned long dmac_base;
90
91void set_dma_count(unsigned int chan, unsigned int count);
92void set_dma_addr(unsigned int chan, unsigned int addr);
93
94static irqreturn_t dma_mte(int irq, void *dev_id, struct pt_regs *regs)
95{
96 unsigned int chan = irq - DMA_IRQ_DMTE0;
97 dma_info_t *info = dma_info + chan;
98 u64 status;
99
100 if (info->mode & DMA_MODE_WRITE) {
101 sh64_out64(info->mem_addr & DMAC_SAR_ADDR, DMAC_SAR(chan));
102 } else {
103 sh64_out64(info->mem_addr & DMAC_DAR_ADDR, DMAC_DAR(chan));
104 }
105
106 set_dma_count(chan, info->count);
107
108 /* Clear the TE bit */
109 status = sh64_in64(DMAC_STATUS(chan));
110 status &= ~DMAC_STATUS_TE;
111 sh64_out64(status, DMAC_STATUS(chan));
112
113 return IRQ_HANDLED;
114}
115
116static struct irqaction irq_dmte = {
117 .handler = dma_mte,
118 .flags = IRQF_DISABLED,
119 .name = "DMA MTE",
120};
121
122static irqreturn_t dma_err(int irq, void *dev_id, struct pt_regs *regs)
123{
124 u64 tmp;
125 u8 chan;
126
127 printk(KERN_NOTICE "DMAC: Got a DMA Error!\n");
128
129 tmp = sh64_in64(DMAC_COMMON_BASE);
130
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);
135
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));
140
141 } else if ((chan = tmp & DMAC_COMMON_ER)) {
142 /* Something else went wrong.. */
143 printk(KERN_NOTICE "DMAC: Error on channel %d\n", chan);
144 }
145
146 /* Reset the ME bit to clear the interrupt */
147 tmp |= DMAC_COMMON_ME;
148 sh64_out64(tmp, DMAC_COMMON_BASE);
149
150 return IRQ_HANDLED;
151}
152
153static struct irqaction irq_derr = {
154 .handler = dma_err,
155 .flags = IRQF_DISABLED,
156 .name = "DMA Error",
157};
158
159static inline unsigned long calc_xmit_shift(unsigned int chan)
160{
161 return sh64_in64(DMAC_CTRL(chan)) & 0x03;
162}
163
164void setup_dma(unsigned int chan, dma_info_t *info)
165{
166 unsigned int irq = DMA_IRQ_DMTE0 + chan;
167 dma_info_t *dma = dma_info + chan;
168
169 make_intc_irq(irq);
170 setup_irq(irq, &irq_dmte);
171 dma = info;
172}
173
174void enable_dma(unsigned int chan)
175{
176 u64 ctrl;
177
178 ctrl = sh64_in64(DMAC_CTRL(chan));
179 ctrl |= DMAC_CTRL_TE;
180 sh64_out64(ctrl, DMAC_CTRL(chan));
181}
182
183void disable_dma(unsigned int chan)
184{
185 u64 ctrl;
186
187 ctrl = sh64_in64(DMAC_CTRL(chan));
188 ctrl &= ~DMAC_CTRL_TE;
189 sh64_out64(ctrl, DMAC_CTRL(chan));
190}
191
192void set_dma_mode(unsigned int chan, char mode)
193{
194 dma_info_t *info = dma_info + chan;
195
196 info->mode = mode;
197
198 set_dma_addr(chan, info->mem_addr);
199 set_dma_count(chan, info->count);
200}
201
202void set_dma_addr(unsigned int chan, unsigned int addr)
203{
204 dma_info_t *info = dma_info + chan;
205 unsigned long sar, dar;
206
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;
210
211 sh64_out64(sar & DMAC_SAR_ADDR, DMAC_SAR(chan));
212 sh64_out64(dar & DMAC_SAR_ADDR, DMAC_DAR(chan));
213}
214
215void set_dma_count(unsigned int chan, unsigned int count)
216{
217 dma_info_t *info = dma_info + chan;
218 u64 tmp;
219
220 info->count = count;
221
222 tmp = (info->count >> calc_xmit_shift(chan)) & DMAC_COUNT_CNT;
223
224 sh64_out64(tmp, DMAC_COUNT(chan));
225}
226
227unsigned long claim_dma_lock(void)
228{
229 unsigned long flags;
230
231 spin_lock_irqsave(&dma_spin_lock, flags);
232
233 return flags;
234}
235
236void release_dma_lock(unsigned long flags)
237{
238 spin_unlock_irqrestore(&dma_spin_lock, flags);
239}
240
241int get_dma_residue(unsigned int chan)
242{
243 return sh64_in64(DMAC_COUNT(chan) << calc_xmit_shift(chan));
244}
245
246int __init init_dma(void)
247{
248 struct vcr_info vcr;
249 u64 tmp;
250
251 /* Remap the DMAC */
252 dmac_base = onchip_remap(PHYS_DMAC_BLOCK, 1024, "DMAC");
253 if (!dmac_base) {
254 printk(KERN_ERR "Unable to remap DMAC\n");
255 return -ENOMEM;
256 }
257
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);
262
263 /* Set the ME bit */
264 tmp = sh64_in64(DMAC_COMMON_BASE);
265 tmp |= DMAC_COMMON_ME;
266 sh64_out64(tmp, DMAC_COMMON_BASE);
267
268 /* Enable the DMAC Error Interrupt */
269 make_intc_irq(DMA_IRQ_DERR);
270 setup_irq(DMA_IRQ_DERR, &irq_derr);
271
272 return 0;
273}
274
275static void __exit exit_dma(void)
276{
277 onchip_unmap(dmac_base);
278 free_irq(DMA_IRQ_DERR, 0);
279}
280
281module_init(init_dma);
282module_exit(exit_dma);
283
284MODULE_AUTHOR("Paul Mundt");
285MODULE_DESCRIPTION("DMA API for SH-5 DMAC");
286MODULE_LICENSE("GPL");
287
288EXPORT_SYMBOL(setup_dma);
289EXPORT_SYMBOL(claim_dma_lock);
290EXPORT_SYMBOL(release_dma_lock);
291EXPORT_SYMBOL(enable_dma);
292EXPORT_SYMBOL(disable_dma);
293EXPORT_SYMBOL(set_dma_mode);
294EXPORT_SYMBOL(set_dma_addr);
295EXPORT_SYMBOL(set_dma_count);
296EXPORT_SYMBOL(get_dma_residue);
297
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