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dma: export jz4740_dma_request
[openwrt/openwrt.git] / target / linux / xburst / files-2.6.32 / arch / mips / jz4740 / dma.c
1 /*
2 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
3 * JZ4740 SoC DMA support
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * You should have received a copy of the GNU General Public License along
11 * with this program; if not, write to the Free Software Foundation, Inc.,
12 * 675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/spinlock.h>
19 #include <linux/interrupt.h>
20
21 #include <linux/dma-mapping.h>
22 #include <asm/mach-jz4740/dma.h>
23 #include <asm/mach-jz4740/regs.h>
24
25 #define JZ_REG_DMA_SRC_ADDR(x) (0x00 + (x) * 0x20)
26 #define JZ_REG_DMA_DST_ADDR(x) (0x04 + (x) * 0x20)
27 #define JZ_REG_DMA_TRANSFER_COUNT(x) (0x08 + (x) * 0x20)
28 #define JZ_REG_DMA_REQ_TYPE(x) (0x0C + (x) * 0x20)
29 #define JZ_REG_DMA_STATUS_CTRL(x) (0x10 + (x) * 0x20)
30 #define JZ_REG_DMA_CMD(x) (0x14 + (x) * 0x20)
31 #define JZ_REG_DMA_DESC_ADDR(x) (0x18 + (x) * 0x20)
32
33 #define JZ_REG_DMA_CTRL 0x300
34 #define JZ_REG_DMA_IRQ 0x304
35 #define JZ_REG_DMA_DOORBELL 0x308
36 #define JZ_REG_DMA_DOORBELL_SET 0x30C
37
38 #define JZ_DMA_STATUS_CTRL_NO_DESC BIT(31)
39 #define JZ_DMA_STATUS_CTRL_DESC_INV BIT(6)
40 #define JZ_DMA_STATUS_CTRL_ADDR_ERR BIT(4)
41 #define JZ_DMA_STATUS_CTRL_TRANSFER_DONE BIT(3)
42 #define JZ_DMA_STATUS_CTRL_HALT BIT(2)
43 #define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE BIT(1)
44 #define JZ_DMA_STATUS_CTRL_ENABLE BIT(0)
45
46 #define JZ_DMA_CMD_SRC_INC BIT(23)
47 #define JZ_DMA_CMD_DST_INC BIT(22)
48 #define JZ_DMA_CMD_RDIL_MASK (0xf << 16)
49 #define JZ_DMA_CMD_SRC_WIDTH_MASK (0x3 << 14)
50 #define JZ_DMA_CMD_DST_WIDTH_MASK (0x3 << 12)
51 #define JZ_DMA_CMD_INTERVAL_LENGTH_MASK (0x7 << 8)
52 #define JZ_DMA_CMD_BLOCK_MODE BIT(7)
53 #define JZ_DMA_CMD_DESC_VALID BIT(4)
54 #define JZ_DMA_CMD_DESC_VALID_MODE BIT(3)
55 #define JZ_DMA_CMD_VALID_IRQ_ENABLE BIT(2)
56 #define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE BIT(1)
57 #define JZ_DMA_CMD_LINK_ENABLE BIT(0)
58
59 #define JZ_DMA_CMD_FLAGS_OFFSET 22
60 #define JZ_DMA_CMD_RDIL_OFFSET 16
61 #define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14
62 #define JZ_DMA_CMD_DST_WIDTH_OFFSET 12
63 #define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8
64 #define JZ_DMA_CMD_MODE_OFFSET 7
65
66 #define JZ_DMA_CTRL_PRIORITY_MASK (0x3 << 8)
67 #define JZ_DMA_CTRL_HALT BIT(3)
68 #define JZ_DMA_CTRL_ADDRESS_ERROR BIT(2)
69 #define JZ_DMA_CTRL_ENABLE BIT(0)
70
71
72 static void __iomem *jz4740_dma_base;
73 static spinlock_t jz4740_dma_lock;
74
75 static inline uint32_t jz4740_dma_read(size_t reg)
76 {
77 return readl(jz4740_dma_base + reg);
78 }
79
80 static inline void jz4740_dma_write(size_t reg, uint32_t val)
81 {
82 writel(val, jz4740_dma_base + reg);
83 }
84
85 static inline void jz4740_dma_write_mask(size_t reg, uint32_t val, uint32_t mask)
86 {
87 uint32_t val2;
88 val2 = jz4740_dma_read(reg);
89 val2 &= ~mask;
90 val2 |= val;
91 jz4740_dma_write(reg, val2);
92 }
93
94 struct jz4740_dma_chan {
95 unsigned int id;
96 void *dev;
97 const char *name;
98
99 enum jz4740_dma_flags flags;
100 uint32_t transfer_shift;
101
102 jz4740_dma_complete_callback_t complete_cb;
103
104 unsigned used:1;
105 };
106
107 #define JZ4740_DMA_CHANNEL(_id) { .id = _id }
108
109 struct jz4740_dma_chan jz4740_dma_channels[] = {
110 JZ4740_DMA_CHANNEL(0),
111 JZ4740_DMA_CHANNEL(1),
112 JZ4740_DMA_CHANNEL(2),
113 JZ4740_DMA_CHANNEL(3),
114 JZ4740_DMA_CHANNEL(4),
115 JZ4740_DMA_CHANNEL(5),
116 };
117
118 struct jz4740_dma_chan* jz4740_dma_request(void *dev, const char *name)
119 {
120 unsigned int i;
121 struct jz4740_dma_chan *dma = NULL;
122
123 spin_lock(&jz4740_dma_lock);
124
125 for (i = 0; i < ARRAY_SIZE(jz4740_dma_channels); ++i) {
126 if (!jz4740_dma_channels[i].used) {
127 dma = &jz4740_dma_channels[i];
128 dma->used = 1;
129 break;
130 }
131 }
132
133 spin_unlock(&jz4740_dma_lock);
134
135 if (!dma)
136 return NULL;
137
138 dma->dev = dev;
139 dma->name = name;
140
141 return dma;
142 }
143 EXPORT_SYMBOL_GPL(jz4740_dma_request);
144
145 void jz4740_dma_configure(struct jz4740_dma_chan *dma,
146 const struct jz4740_dma_config *config)
147 {
148 uint32_t cmd;
149 uint32_t ctrl;
150
151 switch(config->transfer_size) {
152 case JZ4740_DMA_TRANSFER_SIZE_2BYTE:
153 dma->transfer_shift = 1;
154 break;
155 case JZ4740_DMA_TRANSFER_SIZE_4BYTE:
156 dma->transfer_shift = 2;
157 break;
158 case JZ4740_DMA_TRANSFER_SIZE_16BYTE:
159 dma->transfer_shift = 4;
160 break;
161 case JZ4740_DMA_TRANSFER_SIZE_32BYTE:
162 dma->transfer_shift = 5;
163 break;
164 default:
165 dma->transfer_shift = 0;
166 break;
167 }
168
169 cmd = config->flags << JZ_DMA_CMD_FLAGS_OFFSET;
170 cmd |= config->src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET;
171 cmd |= config->dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET;
172 cmd |= config->transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET;
173 cmd |= config->mode << JZ_DMA_CMD_MODE_OFFSET;
174 cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE;
175
176 ctrl = JZ_DMA_STATUS_CTRL_NO_DESC;
177 ctrl |= JZ_DMA_STATUS_CTRL_HALT;
178
179 jz4740_dma_write(JZ_REG_DMA_CMD(dma->id), cmd);
180 jz4740_dma_write(JZ_REG_DMA_STATUS_CTRL(dma->id), ctrl);
181 jz4740_dma_write(JZ_REG_DMA_REQ_TYPE(dma->id), config->request_type);
182 }
183 EXPORT_SYMBOL_GPL(jz4740_dma_configure);
184
185 void jz4740_dma_set_src_addr(struct jz4740_dma_chan *dma, dma_addr_t src)
186 {
187 jz4740_dma_write(JZ_REG_DMA_SRC_ADDR(dma->id), src);
188 }
189 EXPORT_SYMBOL_GPL(jz4740_dma_set_src_addr);
190
191 void jz4740_dma_set_dst_addr(struct jz4740_dma_chan *dma, dma_addr_t dst)
192 {
193 jz4740_dma_write(JZ_REG_DMA_DST_ADDR(dma->id), dst);
194 }
195 EXPORT_SYMBOL_GPL(jz4740_dma_set_dst_addr);
196
197 void jz4740_dma_set_transfer_count(struct jz4740_dma_chan *dma, uint32_t count)
198 {
199 count >>= dma->transfer_shift;
200 jz4740_dma_write(JZ_REG_DMA_TRANSFER_COUNT(dma->id), count);
201 }
202 EXPORT_SYMBOL_GPL(jz4740_dma_set_transfer_count);
203
204 void jz4740_dma_set_complete_cb(struct jz4740_dma_chan *dma,
205 jz4740_dma_complete_callback_t cb)
206 {
207 dma->complete_cb = cb;
208 }
209 EXPORT_SYMBOL_GPL(jz4740_dma_set_complete_cb);
210
211 void jz4740_dma_free(struct jz4740_dma_chan *dma)
212 {
213 dma->dev = NULL;
214 dma->complete_cb = NULL;
215 dma->used = 0;
216 }
217 EXPORT_SYMBOL_GPL(jz4740_dma_free);
218
219 void jz4740_dma_enable(struct jz4740_dma_chan *dma)
220 {
221 jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id),
222 JZ_DMA_STATUS_CTRL_ENABLE,
223 JZ_DMA_STATUS_CTRL_ENABLE | JZ_DMA_STATUS_CTRL_HALT);
224
225 jz4740_dma_write_mask(JZ_REG_DMA_CTRL,
226 JZ_DMA_CTRL_ENABLE,
227 JZ_DMA_CTRL_ENABLE | JZ_DMA_CTRL_HALT);
228 }
229 EXPORT_SYMBOL_GPL(jz4740_dma_enable);
230
231 void jz4740_dma_disable(struct jz4740_dma_chan *dma)
232 {
233 jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
234 JZ_DMA_STATUS_CTRL_ENABLE);
235 }
236 EXPORT_SYMBOL_GPL(jz4740_dma_disable);
237
238 uint32_t jz4740_dma_get_residue(const struct jz4740_dma_chan *dma)
239 {
240 uint32_t residue;
241 residue = jz4740_dma_read(JZ_REG_DMA_TRANSFER_COUNT(dma->id));
242 return residue << dma->transfer_shift;
243 }
244 EXPORT_SYMBOL_GPL(jz4740_dma_get_residue);
245
246 static void jz4740_dma_chan_irq(struct jz4740_dma_chan *dma)
247 {
248 uint32_t status;
249
250 status = jz4740_dma_read(JZ_REG_DMA_STATUS_CTRL(dma->id));
251
252 jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
253 JZ_DMA_STATUS_CTRL_ENABLE | JZ_DMA_STATUS_CTRL_TRANSFER_DONE);
254
255 if (dma->complete_cb)
256 dma->complete_cb(dma, 0, dma->dev);
257 }
258
259 static irqreturn_t jz4740_dma_irq(int irq, void *dev_id)
260 {
261 uint32_t irq_status;
262 unsigned int i;
263
264 irq_status = readl(jz4740_dma_base + JZ_REG_DMA_IRQ);
265
266 for (i = 0; i < 6; ++i) {
267 if (irq_status & (1 << i))
268 jz4740_dma_chan_irq(&jz4740_dma_channels[i]);
269 }
270
271 return IRQ_HANDLED;
272 }
273
274 #if 0
275 static struct jz4740_dma_config dma_test_config = {
276 .src_width = JZ4740_DMA_WIDTH_32BIT,
277 .dst_width = JZ4740_DMA_WIDTH_32BIT,
278 .transfer_size = JZ4740_DMA_TRANSFER_SIZE_4BYTE,
279 .request_type = JZ4740_DMA_TYPE_AUTO_REQUEST,
280 .flags = JZ4740_DMA_SRC_AUTOINC | JZ4740_DMA_DST_AUTOINC,
281 .mode = JZ4740_DMA_MODE_BLOCK,
282 };
283
284 static void jz4740_dma_test(void)
285 {
286 uint32_t *buf1, *buf2;
287 dma_addr_t addr1, addr2;
288 struct jz4740_dma_chan *dma = jz4740_dma_request(NULL, "dma test");
289 int i;
290
291 printk("STARTING DMA TEST\n");
292
293 buf1 = dma_alloc_coherent(NULL,
294 0x1000,
295 &addr1, GFP_KERNEL);
296 buf2 = dma_alloc_coherent(NULL,
297 0x1000,
298 &addr2, GFP_KERNEL);
299
300 for (i = 0; i < 0x400; ++i)
301 buf1[i] = i;
302
303
304 jz4740_dma_configure(dma, &dma_test_config);
305 jz4740_dma_set_src_addr(dma, addr1);
306 jz4740_dma_set_dst_addr(dma, addr2);
307 jz4740_dma_set_transfer_count(dma, 0x1000);
308
309 jz4740_dma_enable(dma);
310 mdelay(2000);
311
312 for (i = 0; i < 0x400; ++i) {
313 if (buf2[i] != i)
314 printk("OH MY GOD: %x %x\n", i, buf2[i]);
315 }
316
317 printk("DMA TEST DONE\n");
318 }
319 #endif
320
321 static int jz4740_dma_init(void)
322 {
323 unsigned int ret;
324
325 jz4740_dma_base = ioremap(CPHYSADDR(DMAC_BASE), 0x400);
326
327 if (!jz4740_dma_base)
328 return -EBUSY;
329
330 spin_lock_init(&jz4740_dma_lock);
331
332 ret = request_irq(JZ_IRQ_DMAC, jz4740_dma_irq, 0, "DMA", NULL);
333
334 if (ret)
335 printk("JZ4740 DMA: Failed to request irq: %d\n", ret);
336
337 return ret;
338 }
339 arch_initcall(jz4740_dma_init);
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