Commit | Line | Data |
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58a85f46 | 1 | /* |
9f72ffed | 2 | * linux/arch/arm/plat-mxc/dma-v1.c |
58a85f46 SH |
3 | * |
4 | * i.MX DMA registration and IRQ dispatching | |
5 | * | |
6 | * Copyright 2006 Pavel Pisa <pisa@cmp.felk.cvut.cz> | |
7 | * Copyright 2008 Juergen Beisert, <kernel@pengutronix.de> | |
8 | * Copyright 2008 Sascha Hauer, <s.hauer@pengutronix.de> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version 2 | |
13 | * of the License, or (at your option) any later version. | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
22 | * MA 02110-1301, USA. | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/interrupt.h> | |
b7f080cf | 29 | #include <linux/err.h> |
58a85f46 SH |
30 | #include <linux/errno.h> |
31 | #include <linux/clk.h> | |
32 | #include <linux/scatterlist.h> | |
33 | #include <linux/io.h> | |
34 | ||
35 | #include <asm/system.h> | |
36 | #include <asm/irq.h> | |
37 | #include <mach/hardware.h> | |
9f72ffed | 38 | #include <mach/dma-v1.h> |
58a85f46 SH |
39 | |
40 | #define DMA_DCR 0x00 /* Control Register */ | |
41 | #define DMA_DISR 0x04 /* Interrupt status Register */ | |
42 | #define DMA_DIMR 0x08 /* Interrupt mask Register */ | |
43 | #define DMA_DBTOSR 0x0c /* Burst timeout status Register */ | |
44 | #define DMA_DRTOSR 0x10 /* Request timeout Register */ | |
45 | #define DMA_DSESR 0x14 /* Transfer Error Status Register */ | |
46 | #define DMA_DBOSR 0x18 /* Buffer overflow status Register */ | |
47 | #define DMA_DBTOCR 0x1c /* Burst timeout control Register */ | |
48 | #define DMA_WSRA 0x40 /* W-Size Register A */ | |
49 | #define DMA_XSRA 0x44 /* X-Size Register A */ | |
50 | #define DMA_YSRA 0x48 /* Y-Size Register A */ | |
51 | #define DMA_WSRB 0x4c /* W-Size Register B */ | |
52 | #define DMA_XSRB 0x50 /* X-Size Register B */ | |
53 | #define DMA_YSRB 0x54 /* Y-Size Register B */ | |
54 | #define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */ | |
55 | #define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */ | |
56 | #define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */ | |
57 | #define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */ | |
58 | #define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */ | |
59 | #define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */ | |
60 | #define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */ | |
61 | #define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */ | |
62 | #define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */ | |
63 | ||
64 | #define DCR_DRST (1<<1) | |
65 | #define DCR_DEN (1<<0) | |
66 | #define DBTOCR_EN (1<<15) | |
67 | #define DBTOCR_CNT(x) ((x) & 0x7fff) | |
68 | #define CNTR_CNT(x) ((x) & 0xffffff) | |
69 | #define CCR_ACRPT (1<<14) | |
70 | #define CCR_DMOD_LINEAR (0x0 << 12) | |
71 | #define CCR_DMOD_2D (0x1 << 12) | |
72 | #define CCR_DMOD_FIFO (0x2 << 12) | |
73 | #define CCR_DMOD_EOBFIFO (0x3 << 12) | |
74 | #define CCR_SMOD_LINEAR (0x0 << 10) | |
75 | #define CCR_SMOD_2D (0x1 << 10) | |
76 | #define CCR_SMOD_FIFO (0x2 << 10) | |
77 | #define CCR_SMOD_EOBFIFO (0x3 << 10) | |
78 | #define CCR_MDIR_DEC (1<<9) | |
79 | #define CCR_MSEL_B (1<<8) | |
80 | #define CCR_DSIZ_32 (0x0 << 6) | |
81 | #define CCR_DSIZ_8 (0x1 << 6) | |
82 | #define CCR_DSIZ_16 (0x2 << 6) | |
83 | #define CCR_SSIZ_32 (0x0 << 4) | |
84 | #define CCR_SSIZ_8 (0x1 << 4) | |
85 | #define CCR_SSIZ_16 (0x2 << 4) | |
86 | #define CCR_REN (1<<3) | |
87 | #define CCR_RPT (1<<2) | |
88 | #define CCR_FRC (1<<1) | |
89 | #define CCR_CEN (1<<0) | |
90 | #define RTOR_EN (1<<15) | |
91 | #define RTOR_CLK (1<<14) | |
92 | #define RTOR_PSC (1<<13) | |
93 | ||
94 | /* | |
95 | * struct imx_dma_channel - i.MX specific DMA extension | |
96 | * @name: name specified by DMA client | |
97 | * @irq_handler: client callback for end of transfer | |
98 | * @err_handler: client callback for error condition | |
99 | * @data: clients context data for callbacks | |
100 | * @dma_mode: direction of the transfer %DMA_MODE_READ or %DMA_MODE_WRITE | |
101 | * @sg: pointer to the actual read/written chunk for scatter-gather emulation | |
102 | * @resbytes: total residual number of bytes to transfer | |
103 | * (it can be lower or same as sum of SG mapped chunk sizes) | |
104 | * @sgcount: number of chunks to be read/written | |
105 | * | |
106 | * Structure is used for IMX DMA processing. It would be probably good | |
107 | * @struct dma_struct in the future for external interfacing and use | |
108 | * @struct imx_dma_channel only as extension to it. | |
109 | */ | |
110 | ||
111 | struct imx_dma_channel { | |
112 | const char *name; | |
113 | void (*irq_handler) (int, void *); | |
114 | void (*err_handler) (int, void *, int errcode); | |
115 | void (*prog_handler) (int, void *, struct scatterlist *); | |
116 | void *data; | |
4e57ea9a | 117 | unsigned int dma_mode; |
58a85f46 SH |
118 | struct scatterlist *sg; |
119 | unsigned int resbytes; | |
120 | int dma_num; | |
121 | ||
122 | int in_use; | |
123 | ||
124 | u32 ccr_from_device; | |
125 | u32 ccr_to_device; | |
126 | ||
127 | struct timer_list watchdog; | |
128 | ||
129 | int hw_chaining; | |
130 | }; | |
131 | ||
e9f49d41 UKK |
132 | static void __iomem *imx_dmav1_baseaddr; |
133 | ||
134 | static void imx_dmav1_writel(unsigned val, unsigned offset) | |
135 | { | |
136 | __raw_writel(val, imx_dmav1_baseaddr + offset); | |
137 | } | |
138 | ||
139 | static unsigned imx_dmav1_readl(unsigned offset) | |
140 | { | |
141 | return __raw_readl(imx_dmav1_baseaddr + offset); | |
142 | } | |
143 | ||
58a85f46 SH |
144 | static struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS]; |
145 | ||
146 | static struct clk *dma_clk; | |
147 | ||
148 | static int imx_dma_hw_chain(struct imx_dma_channel *imxdma) | |
149 | { | |
150 | if (cpu_is_mx27()) | |
151 | return imxdma->hw_chaining; | |
152 | else | |
153 | return 0; | |
154 | } | |
155 | ||
58a85f46 SH |
156 | /* |
157 | * imx_dma_sg_next - prepare next chunk for scatter-gather DMA emulation | |
158 | */ | |
159 | static inline int imx_dma_sg_next(int channel, struct scatterlist *sg) | |
160 | { | |
161 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
162 | unsigned long now; | |
163 | ||
164 | if (!imxdma->name) { | |
165 | printk(KERN_CRIT "%s: called for not allocated channel %d\n", | |
166 | __func__, channel); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | now = min(imxdma->resbytes, sg->length); | |
4998f1a3 SH |
171 | if (imxdma->resbytes != IMX_DMA_LENGTH_LOOP) |
172 | imxdma->resbytes -= now; | |
58a85f46 SH |
173 | |
174 | if ((imxdma->dma_mode & DMA_MODE_MASK) == DMA_MODE_READ) | |
e9f49d41 | 175 | imx_dmav1_writel(sg->dma_address, DMA_DAR(channel)); |
58a85f46 | 176 | else |
e9f49d41 | 177 | imx_dmav1_writel(sg->dma_address, DMA_SAR(channel)); |
58a85f46 | 178 | |
e9f49d41 | 179 | imx_dmav1_writel(now, DMA_CNTR(channel)); |
58a85f46 SH |
180 | |
181 | pr_debug("imxdma%d: next sg chunk dst 0x%08x, src 0x%08x, " | |
182 | "size 0x%08x\n", channel, | |
e9f49d41 UKK |
183 | imx_dmav1_readl(DMA_DAR(channel)), |
184 | imx_dmav1_readl(DMA_SAR(channel)), | |
185 | imx_dmav1_readl(DMA_CNTR(channel))); | |
58a85f46 SH |
186 | |
187 | return now; | |
188 | } | |
189 | ||
190 | /** | |
191 | * imx_dma_setup_single - setup i.MX DMA channel for linear memory to/from | |
192 | * device transfer | |
193 | * | |
194 | * @channel: i.MX DMA channel number | |
195 | * @dma_address: the DMA/physical memory address of the linear data block | |
196 | * to transfer | |
197 | * @dma_length: length of the data block in bytes | |
198 | * @dev_addr: physical device port address | |
199 | * @dmamode: DMA transfer mode, %DMA_MODE_READ from the device to the memory | |
200 | * or %DMA_MODE_WRITE from memory to the device | |
201 | * | |
202 | * Return value: if incorrect parameters are provided -%EINVAL. | |
203 | * Zero indicates success. | |
204 | */ | |
205 | int | |
206 | imx_dma_setup_single(int channel, dma_addr_t dma_address, | |
207 | unsigned int dma_length, unsigned int dev_addr, | |
33ebc19d | 208 | unsigned int dmamode) |
58a85f46 SH |
209 | { |
210 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
211 | ||
212 | imxdma->sg = NULL; | |
213 | imxdma->dma_mode = dmamode; | |
214 | ||
215 | if (!dma_address) { | |
216 | printk(KERN_ERR "imxdma%d: imx_dma_setup_single null address\n", | |
217 | channel); | |
218 | return -EINVAL; | |
219 | } | |
220 | ||
221 | if (!dma_length) { | |
222 | printk(KERN_ERR "imxdma%d: imx_dma_setup_single zero length\n", | |
223 | channel); | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
227 | if ((dmamode & DMA_MODE_MASK) == DMA_MODE_READ) { | |
228 | pr_debug("imxdma%d: %s dma_addressg=0x%08x dma_length=%d " | |
229 | "dev_addr=0x%08x for read\n", | |
230 | channel, __func__, (unsigned int)dma_address, | |
231 | dma_length, dev_addr); | |
232 | ||
e9f49d41 UKK |
233 | imx_dmav1_writel(dev_addr, DMA_SAR(channel)); |
234 | imx_dmav1_writel(dma_address, DMA_DAR(channel)); | |
235 | imx_dmav1_writel(imxdma->ccr_from_device, DMA_CCR(channel)); | |
58a85f46 SH |
236 | } else if ((dmamode & DMA_MODE_MASK) == DMA_MODE_WRITE) { |
237 | pr_debug("imxdma%d: %s dma_addressg=0x%08x dma_length=%d " | |
238 | "dev_addr=0x%08x for write\n", | |
239 | channel, __func__, (unsigned int)dma_address, | |
240 | dma_length, dev_addr); | |
241 | ||
e9f49d41 UKK |
242 | imx_dmav1_writel(dma_address, DMA_SAR(channel)); |
243 | imx_dmav1_writel(dev_addr, DMA_DAR(channel)); | |
244 | imx_dmav1_writel(imxdma->ccr_to_device, | |
245 | DMA_CCR(channel)); | |
58a85f46 SH |
246 | } else { |
247 | printk(KERN_ERR "imxdma%d: imx_dma_setup_single bad dmamode\n", | |
248 | channel); | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
e9f49d41 | 252 | imx_dmav1_writel(dma_length, DMA_CNTR(channel)); |
58a85f46 SH |
253 | |
254 | return 0; | |
255 | } | |
256 | EXPORT_SYMBOL(imx_dma_setup_single); | |
257 | ||
258 | /** | |
259 | * imx_dma_setup_sg - setup i.MX DMA channel SG list to/from device transfer | |
260 | * @channel: i.MX DMA channel number | |
261 | * @sg: pointer to the scatter-gather list/vector | |
262 | * @sgcount: scatter-gather list hungs count | |
263 | * @dma_length: total length of the transfer request in bytes | |
264 | * @dev_addr: physical device port address | |
265 | * @dmamode: DMA transfer mode, %DMA_MODE_READ from the device to the memory | |
266 | * or %DMA_MODE_WRITE from memory to the device | |
267 | * | |
268 | * The function sets up DMA channel state and registers to be ready for | |
269 | * transfer specified by provided parameters. The scatter-gather emulation | |
270 | * is set up according to the parameters. | |
271 | * | |
272 | * The full preparation of the transfer requires setup of more register | |
273 | * by the caller before imx_dma_enable() can be called. | |
274 | * | |
275 | * %BLR(channel) holds transfer burst length in bytes, 0 means 64 bytes | |
276 | * | |
277 | * %RSSR(channel) has to be set to the DMA request line source %DMA_REQ_xxx | |
278 | * | |
279 | * %CCR(channel) has to specify transfer parameters, the next settings is | |
280 | * typical for linear or simple scatter-gather transfers if %DMA_MODE_READ is | |
281 | * specified | |
282 | * | |
283 | * %CCR_DMOD_LINEAR | %CCR_DSIZ_32 | %CCR_SMOD_FIFO | %CCR_SSIZ_x | |
284 | * | |
285 | * The typical setup for %DMA_MODE_WRITE is specified by next options | |
286 | * combination | |
287 | * | |
288 | * %CCR_SMOD_LINEAR | %CCR_SSIZ_32 | %CCR_DMOD_FIFO | %CCR_DSIZ_x | |
289 | * | |
290 | * Be careful here and do not mistakenly mix source and target device | |
291 | * port sizes constants, they are really different: | |
292 | * %CCR_SSIZ_8, %CCR_SSIZ_16, %CCR_SSIZ_32, | |
293 | * %CCR_DSIZ_8, %CCR_DSIZ_16, %CCR_DSIZ_32 | |
294 | * | |
295 | * Return value: if incorrect parameters are provided -%EINVAL. | |
296 | * Zero indicates success. | |
297 | */ | |
298 | int | |
299 | imx_dma_setup_sg(int channel, | |
300 | struct scatterlist *sg, unsigned int sgcount, | |
301 | unsigned int dma_length, unsigned int dev_addr, | |
33ebc19d | 302 | unsigned int dmamode) |
58a85f46 SH |
303 | { |
304 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
305 | ||
306 | if (imxdma->in_use) | |
307 | return -EBUSY; | |
308 | ||
309 | imxdma->sg = sg; | |
310 | imxdma->dma_mode = dmamode; | |
311 | imxdma->resbytes = dma_length; | |
312 | ||
313 | if (!sg || !sgcount) { | |
a7ce2e0d | 314 | printk(KERN_ERR "imxdma%d: imx_dma_setup_sg empty sg list\n", |
58a85f46 SH |
315 | channel); |
316 | return -EINVAL; | |
317 | } | |
318 | ||
319 | if (!sg->length) { | |
320 | printk(KERN_ERR "imxdma%d: imx_dma_setup_sg zero length\n", | |
321 | channel); | |
322 | return -EINVAL; | |
323 | } | |
324 | ||
325 | if ((dmamode & DMA_MODE_MASK) == DMA_MODE_READ) { | |
326 | pr_debug("imxdma%d: %s sg=%p sgcount=%d total length=%d " | |
327 | "dev_addr=0x%08x for read\n", | |
328 | channel, __func__, sg, sgcount, dma_length, dev_addr); | |
329 | ||
e9f49d41 UKK |
330 | imx_dmav1_writel(dev_addr, DMA_SAR(channel)); |
331 | imx_dmav1_writel(imxdma->ccr_from_device, DMA_CCR(channel)); | |
58a85f46 SH |
332 | } else if ((dmamode & DMA_MODE_MASK) == DMA_MODE_WRITE) { |
333 | pr_debug("imxdma%d: %s sg=%p sgcount=%d total length=%d " | |
334 | "dev_addr=0x%08x for write\n", | |
335 | channel, __func__, sg, sgcount, dma_length, dev_addr); | |
336 | ||
e9f49d41 UKK |
337 | imx_dmav1_writel(dev_addr, DMA_DAR(channel)); |
338 | imx_dmav1_writel(imxdma->ccr_to_device, DMA_CCR(channel)); | |
58a85f46 SH |
339 | } else { |
340 | printk(KERN_ERR "imxdma%d: imx_dma_setup_sg bad dmamode\n", | |
341 | channel); | |
342 | return -EINVAL; | |
343 | } | |
344 | ||
345 | imx_dma_sg_next(channel, sg); | |
346 | ||
347 | return 0; | |
348 | } | |
349 | EXPORT_SYMBOL(imx_dma_setup_sg); | |
350 | ||
351 | int | |
352 | imx_dma_config_channel(int channel, unsigned int config_port, | |
353 | unsigned int config_mem, unsigned int dmareq, int hw_chaining) | |
354 | { | |
355 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
356 | u32 dreq = 0; | |
357 | ||
358 | imxdma->hw_chaining = 0; | |
359 | ||
360 | if (hw_chaining) { | |
361 | imxdma->hw_chaining = 1; | |
362 | if (!imx_dma_hw_chain(imxdma)) | |
363 | return -EINVAL; | |
364 | } | |
365 | ||
366 | if (dmareq) | |
367 | dreq = CCR_REN; | |
368 | ||
369 | imxdma->ccr_from_device = config_port | (config_mem << 2) | dreq; | |
370 | imxdma->ccr_to_device = config_mem | (config_port << 2) | dreq; | |
371 | ||
e9f49d41 | 372 | imx_dmav1_writel(dmareq, DMA_RSSR(channel)); |
58a85f46 SH |
373 | |
374 | return 0; | |
375 | } | |
376 | EXPORT_SYMBOL(imx_dma_config_channel); | |
377 | ||
378 | void imx_dma_config_burstlen(int channel, unsigned int burstlen) | |
379 | { | |
e9f49d41 | 380 | imx_dmav1_writel(burstlen, DMA_BLR(channel)); |
58a85f46 SH |
381 | } |
382 | EXPORT_SYMBOL(imx_dma_config_burstlen); | |
383 | ||
384 | /** | |
385 | * imx_dma_setup_handlers - setup i.MX DMA channel end and error notification | |
386 | * handlers | |
387 | * @channel: i.MX DMA channel number | |
388 | * @irq_handler: the pointer to the function called if the transfer | |
389 | * ends successfully | |
390 | * @err_handler: the pointer to the function called if the premature | |
391 | * end caused by error occurs | |
392 | * @data: user specified value to be passed to the handlers | |
393 | */ | |
394 | int | |
395 | imx_dma_setup_handlers(int channel, | |
396 | void (*irq_handler) (int, void *), | |
397 | void (*err_handler) (int, void *, int), | |
398 | void *data) | |
399 | { | |
400 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
401 | unsigned long flags; | |
402 | ||
403 | if (!imxdma->name) { | |
404 | printk(KERN_CRIT "%s: called for not allocated channel %d\n", | |
405 | __func__, channel); | |
406 | return -ENODEV; | |
407 | } | |
408 | ||
409 | local_irq_save(flags); | |
e9f49d41 | 410 | imx_dmav1_writel(1 << channel, DMA_DISR); |
58a85f46 SH |
411 | imxdma->irq_handler = irq_handler; |
412 | imxdma->err_handler = err_handler; | |
413 | imxdma->data = data; | |
414 | local_irq_restore(flags); | |
415 | return 0; | |
416 | } | |
417 | EXPORT_SYMBOL(imx_dma_setup_handlers); | |
418 | ||
419 | /** | |
420 | * imx_dma_setup_progression_handler - setup i.MX DMA channel progression | |
421 | * handlers | |
422 | * @channel: i.MX DMA channel number | |
423 | * @prog_handler: the pointer to the function called if the transfer progresses | |
424 | */ | |
425 | int | |
426 | imx_dma_setup_progression_handler(int channel, | |
427 | void (*prog_handler) (int, void*, struct scatterlist*)) | |
428 | { | |
429 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
430 | unsigned long flags; | |
431 | ||
432 | if (!imxdma->name) { | |
433 | printk(KERN_CRIT "%s: called for not allocated channel %d\n", | |
434 | __func__, channel); | |
435 | return -ENODEV; | |
436 | } | |
437 | ||
438 | local_irq_save(flags); | |
439 | imxdma->prog_handler = prog_handler; | |
440 | local_irq_restore(flags); | |
441 | return 0; | |
442 | } | |
443 | EXPORT_SYMBOL(imx_dma_setup_progression_handler); | |
444 | ||
445 | /** | |
446 | * imx_dma_enable - function to start i.MX DMA channel operation | |
447 | * @channel: i.MX DMA channel number | |
448 | * | |
449 | * The channel has to be allocated by driver through imx_dma_request() | |
450 | * or imx_dma_request_by_prio() function. | |
451 | * The transfer parameters has to be set to the channel registers through | |
452 | * call of the imx_dma_setup_single() or imx_dma_setup_sg() function | |
453 | * and registers %BLR(channel), %RSSR(channel) and %CCR(channel) has to | |
454 | * be set prior this function call by the channel user. | |
455 | */ | |
456 | void imx_dma_enable(int channel) | |
457 | { | |
458 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
459 | unsigned long flags; | |
460 | ||
461 | pr_debug("imxdma%d: imx_dma_enable\n", channel); | |
462 | ||
463 | if (!imxdma->name) { | |
464 | printk(KERN_CRIT "%s: called for not allocated channel %d\n", | |
465 | __func__, channel); | |
466 | return; | |
467 | } | |
468 | ||
469 | if (imxdma->in_use) | |
470 | return; | |
471 | ||
472 | local_irq_save(flags); | |
473 | ||
e9f49d41 UKK |
474 | imx_dmav1_writel(1 << channel, DMA_DISR); |
475 | imx_dmav1_writel(imx_dmav1_readl(DMA_DIMR) & ~(1 << channel), DMA_DIMR); | |
476 | imx_dmav1_writel(imx_dmav1_readl(DMA_CCR(channel)) | CCR_CEN | | |
477 | CCR_ACRPT, DMA_CCR(channel)); | |
58a85f46 | 478 | |
8735fde2 UKK |
479 | if ((cpu_is_mx21() || cpu_is_mx27()) && |
480 | imxdma->sg && imx_dma_hw_chain(imxdma)) { | |
58a85f46 SH |
481 | imxdma->sg = sg_next(imxdma->sg); |
482 | if (imxdma->sg) { | |
483 | u32 tmp; | |
484 | imx_dma_sg_next(channel, imxdma->sg); | |
e9f49d41 UKK |
485 | tmp = imx_dmav1_readl(DMA_CCR(channel)); |
486 | imx_dmav1_writel(tmp | CCR_RPT | CCR_ACRPT, | |
487 | DMA_CCR(channel)); | |
58a85f46 SH |
488 | } |
489 | } | |
58a85f46 SH |
490 | imxdma->in_use = 1; |
491 | ||
492 | local_irq_restore(flags); | |
493 | } | |
494 | EXPORT_SYMBOL(imx_dma_enable); | |
495 | ||
496 | /** | |
497 | * imx_dma_disable - stop, finish i.MX DMA channel operatin | |
498 | * @channel: i.MX DMA channel number | |
499 | */ | |
500 | void imx_dma_disable(int channel) | |
501 | { | |
502 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
503 | unsigned long flags; | |
504 | ||
505 | pr_debug("imxdma%d: imx_dma_disable\n", channel); | |
506 | ||
507 | if (imx_dma_hw_chain(imxdma)) | |
508 | del_timer(&imxdma->watchdog); | |
509 | ||
510 | local_irq_save(flags); | |
e9f49d41 UKK |
511 | imx_dmav1_writel(imx_dmav1_readl(DMA_DIMR) | (1 << channel), DMA_DIMR); |
512 | imx_dmav1_writel(imx_dmav1_readl(DMA_CCR(channel)) & ~CCR_CEN, | |
513 | DMA_CCR(channel)); | |
514 | imx_dmav1_writel(1 << channel, DMA_DISR); | |
58a85f46 SH |
515 | imxdma->in_use = 0; |
516 | local_irq_restore(flags); | |
517 | } | |
518 | EXPORT_SYMBOL(imx_dma_disable); | |
519 | ||
520 | static void imx_dma_watchdog(unsigned long chno) | |
521 | { | |
522 | struct imx_dma_channel *imxdma = &imx_dma_channels[chno]; | |
523 | ||
e9f49d41 | 524 | imx_dmav1_writel(0, DMA_CCR(chno)); |
58a85f46 SH |
525 | imxdma->in_use = 0; |
526 | imxdma->sg = NULL; | |
527 | ||
528 | if (imxdma->err_handler) | |
529 | imxdma->err_handler(chno, imxdma->data, IMX_DMA_ERR_TIMEOUT); | |
530 | } | |
531 | ||
532 | static irqreturn_t dma_err_handler(int irq, void *dev_id) | |
533 | { | |
534 | int i, disr; | |
535 | struct imx_dma_channel *imxdma; | |
536 | unsigned int err_mask; | |
537 | int errcode; | |
538 | ||
e9f49d41 | 539 | disr = imx_dmav1_readl(DMA_DISR); |
58a85f46 | 540 | |
e9f49d41 UKK |
541 | err_mask = imx_dmav1_readl(DMA_DBTOSR) | |
542 | imx_dmav1_readl(DMA_DRTOSR) | | |
543 | imx_dmav1_readl(DMA_DSESR) | | |
544 | imx_dmav1_readl(DMA_DBOSR); | |
58a85f46 SH |
545 | |
546 | if (!err_mask) | |
547 | return IRQ_HANDLED; | |
548 | ||
e9f49d41 | 549 | imx_dmav1_writel(disr & err_mask, DMA_DISR); |
58a85f46 SH |
550 | |
551 | for (i = 0; i < IMX_DMA_CHANNELS; i++) { | |
552 | if (!(err_mask & (1 << i))) | |
553 | continue; | |
554 | imxdma = &imx_dma_channels[i]; | |
555 | errcode = 0; | |
556 | ||
e9f49d41 UKK |
557 | if (imx_dmav1_readl(DMA_DBTOSR) & (1 << i)) { |
558 | imx_dmav1_writel(1 << i, DMA_DBTOSR); | |
58a85f46 SH |
559 | errcode |= IMX_DMA_ERR_BURST; |
560 | } | |
e9f49d41 UKK |
561 | if (imx_dmav1_readl(DMA_DRTOSR) & (1 << i)) { |
562 | imx_dmav1_writel(1 << i, DMA_DRTOSR); | |
58a85f46 SH |
563 | errcode |= IMX_DMA_ERR_REQUEST; |
564 | } | |
e9f49d41 UKK |
565 | if (imx_dmav1_readl(DMA_DSESR) & (1 << i)) { |
566 | imx_dmav1_writel(1 << i, DMA_DSESR); | |
58a85f46 SH |
567 | errcode |= IMX_DMA_ERR_TRANSFER; |
568 | } | |
e9f49d41 UKK |
569 | if (imx_dmav1_readl(DMA_DBOSR) & (1 << i)) { |
570 | imx_dmav1_writel(1 << i, DMA_DBOSR); | |
58a85f46 SH |
571 | errcode |= IMX_DMA_ERR_BUFFER; |
572 | } | |
573 | if (imxdma->name && imxdma->err_handler) { | |
574 | imxdma->err_handler(i, imxdma->data, errcode); | |
575 | continue; | |
576 | } | |
577 | ||
578 | imx_dma_channels[i].sg = NULL; | |
579 | ||
580 | printk(KERN_WARNING | |
581 | "DMA timeout on channel %d (%s) -%s%s%s%s\n", | |
582 | i, imxdma->name, | |
583 | errcode & IMX_DMA_ERR_BURST ? " burst" : "", | |
584 | errcode & IMX_DMA_ERR_REQUEST ? " request" : "", | |
585 | errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "", | |
586 | errcode & IMX_DMA_ERR_BUFFER ? " buffer" : ""); | |
587 | } | |
588 | return IRQ_HANDLED; | |
589 | } | |
590 | ||
591 | static void dma_irq_handle_channel(int chno) | |
592 | { | |
593 | struct imx_dma_channel *imxdma = &imx_dma_channels[chno]; | |
594 | ||
595 | if (!imxdma->name) { | |
596 | /* | |
597 | * IRQ for an unregistered DMA channel: | |
598 | * let's clear the interrupts and disable it. | |
599 | */ | |
600 | printk(KERN_WARNING | |
601 | "spurious IRQ for DMA channel %d\n", chno); | |
602 | return; | |
603 | } | |
604 | ||
605 | if (imxdma->sg) { | |
606 | u32 tmp; | |
607 | struct scatterlist *current_sg = imxdma->sg; | |
608 | imxdma->sg = sg_next(imxdma->sg); | |
609 | ||
610 | if (imxdma->sg) { | |
611 | imx_dma_sg_next(chno, imxdma->sg); | |
612 | ||
e9f49d41 | 613 | tmp = imx_dmav1_readl(DMA_CCR(chno)); |
58a85f46 SH |
614 | |
615 | if (imx_dma_hw_chain(imxdma)) { | |
616 | /* FIXME: The timeout should probably be | |
617 | * configurable | |
618 | */ | |
619 | mod_timer(&imxdma->watchdog, | |
620 | jiffies + msecs_to_jiffies(500)); | |
621 | ||
622 | tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT; | |
e9f49d41 | 623 | imx_dmav1_writel(tmp, DMA_CCR(chno)); |
58a85f46 | 624 | } else { |
e9f49d41 | 625 | imx_dmav1_writel(tmp & ~CCR_CEN, DMA_CCR(chno)); |
58a85f46 SH |
626 | tmp |= CCR_CEN; |
627 | } | |
628 | ||
e9f49d41 | 629 | imx_dmav1_writel(tmp, DMA_CCR(chno)); |
58a85f46 SH |
630 | |
631 | if (imxdma->prog_handler) | |
632 | imxdma->prog_handler(chno, imxdma->data, | |
633 | current_sg); | |
634 | ||
635 | return; | |
636 | } | |
637 | ||
638 | if (imx_dma_hw_chain(imxdma)) { | |
639 | del_timer(&imxdma->watchdog); | |
640 | return; | |
641 | } | |
642 | } | |
643 | ||
e9f49d41 | 644 | imx_dmav1_writel(0, DMA_CCR(chno)); |
58a85f46 SH |
645 | imxdma->in_use = 0; |
646 | if (imxdma->irq_handler) | |
647 | imxdma->irq_handler(chno, imxdma->data); | |
648 | } | |
649 | ||
650 | static irqreturn_t dma_irq_handler(int irq, void *dev_id) | |
651 | { | |
652 | int i, disr; | |
653 | ||
8735fde2 UKK |
654 | if (cpu_is_mx21() || cpu_is_mx27()) |
655 | dma_err_handler(irq, dev_id); | |
58a85f46 | 656 | |
e9f49d41 | 657 | disr = imx_dmav1_readl(DMA_DISR); |
58a85f46 SH |
658 | |
659 | pr_debug("imxdma: dma_irq_handler called, disr=0x%08x\n", | |
660 | disr); | |
661 | ||
e9f49d41 | 662 | imx_dmav1_writel(disr, DMA_DISR); |
58a85f46 SH |
663 | for (i = 0; i < IMX_DMA_CHANNELS; i++) { |
664 | if (disr & (1 << i)) | |
665 | dma_irq_handle_channel(i); | |
666 | } | |
667 | ||
668 | return IRQ_HANDLED; | |
669 | } | |
670 | ||
671 | /** | |
672 | * imx_dma_request - request/allocate specified channel number | |
673 | * @channel: i.MX DMA channel number | |
674 | * @name: the driver/caller own non-%NULL identification | |
675 | */ | |
676 | int imx_dma_request(int channel, const char *name) | |
677 | { | |
678 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
679 | unsigned long flags; | |
7c995023 | 680 | int ret = 0; |
58a85f46 SH |
681 | |
682 | /* basic sanity checks */ | |
683 | if (!name) | |
684 | return -EINVAL; | |
685 | ||
686 | if (channel >= IMX_DMA_CHANNELS) { | |
687 | printk(KERN_CRIT "%s: called for non-existed channel %d\n", | |
688 | __func__, channel); | |
689 | return -EINVAL; | |
690 | } | |
691 | ||
692 | local_irq_save(flags); | |
693 | if (imxdma->name) { | |
694 | local_irq_restore(flags); | |
695 | return -EBUSY; | |
696 | } | |
f7fdaca9 | 697 | memset(imxdma, 0, sizeof(*imxdma)); |
f2292532 MF |
698 | imxdma->name = name; |
699 | local_irq_restore(flags); /* request_irq() can block */ | |
58a85f46 | 700 | |
8735fde2 UKK |
701 | if (cpu_is_mx21() || cpu_is_mx27()) { |
702 | ret = request_irq(MX2x_INT_DMACH0 + channel, | |
703 | dma_irq_handler, 0, "DMA", NULL); | |
704 | if (ret) { | |
705 | imxdma->name = NULL; | |
706 | pr_crit("Can't register IRQ %d for DMA channel %d\n", | |
707 | MX2x_INT_DMACH0 + channel, channel); | |
708 | return ret; | |
709 | } | |
710 | init_timer(&imxdma->watchdog); | |
711 | imxdma->watchdog.function = &imx_dma_watchdog; | |
712 | imxdma->watchdog.data = channel; | |
58a85f46 | 713 | } |
58a85f46 | 714 | |
7c995023 | 715 | return ret; |
58a85f46 SH |
716 | } |
717 | EXPORT_SYMBOL(imx_dma_request); | |
718 | ||
719 | /** | |
720 | * imx_dma_free - release previously acquired channel | |
721 | * @channel: i.MX DMA channel number | |
722 | */ | |
723 | void imx_dma_free(int channel) | |
724 | { | |
725 | unsigned long flags; | |
726 | struct imx_dma_channel *imxdma = &imx_dma_channels[channel]; | |
727 | ||
728 | if (!imxdma->name) { | |
729 | printk(KERN_CRIT | |
730 | "%s: trying to free free channel %d\n", | |
731 | __func__, channel); | |
732 | return; | |
733 | } | |
734 | ||
735 | local_irq_save(flags); | |
736 | /* Disable interrupts */ | |
de0096d8 | 737 | imx_dma_disable(channel); |
58a85f46 SH |
738 | imxdma->name = NULL; |
739 | ||
8735fde2 UKK |
740 | if (cpu_is_mx21() || cpu_is_mx27()) |
741 | free_irq(MX2x_INT_DMACH0 + channel, NULL); | |
58a85f46 SH |
742 | |
743 | local_irq_restore(flags); | |
744 | } | |
745 | EXPORT_SYMBOL(imx_dma_free); | |
746 | ||
747 | /** | |
748 | * imx_dma_request_by_prio - find and request some of free channels best | |
749 | * suiting requested priority | |
750 | * @channel: i.MX DMA channel number | |
751 | * @name: the driver/caller own non-%NULL identification | |
752 | * | |
753 | * This function tries to find a free channel in the specified priority group | |
58a85f46 SH |
754 | * if the priority cannot be achieved it tries to look for free channel |
755 | * in the higher and then even lower priority groups. | |
756 | * | |
757 | * Return value: If there is no free channel to allocate, -%ENODEV is returned. | |
758 | * On successful allocation channel is returned. | |
759 | */ | |
760 | int imx_dma_request_by_prio(const char *name, enum imx_dma_prio prio) | |
761 | { | |
762 | int i; | |
763 | int best; | |
764 | ||
765 | switch (prio) { | |
766 | case (DMA_PRIO_HIGH): | |
767 | best = 8; | |
768 | break; | |
769 | case (DMA_PRIO_MEDIUM): | |
770 | best = 4; | |
771 | break; | |
772 | case (DMA_PRIO_LOW): | |
773 | default: | |
774 | best = 0; | |
775 | break; | |
776 | } | |
777 | ||
778 | for (i = best; i < IMX_DMA_CHANNELS; i++) | |
779 | if (!imx_dma_request(i, name)) | |
780 | return i; | |
781 | ||
782 | for (i = best - 1; i >= 0; i--) | |
783 | if (!imx_dma_request(i, name)) | |
784 | return i; | |
785 | ||
786 | printk(KERN_ERR "%s: no free DMA channel found\n", __func__); | |
787 | ||
788 | return -ENODEV; | |
789 | } | |
790 | EXPORT_SYMBOL(imx_dma_request_by_prio); | |
791 | ||
792 | static int __init imx_dma_init(void) | |
793 | { | |
794 | int ret = 0; | |
795 | int i; | |
796 | ||
e9f49d41 UKK |
797 | if (cpu_is_mx1()) |
798 | imx_dmav1_baseaddr = MX1_IO_ADDRESS(MX1_DMA_BASE_ADDR); | |
6b66ef01 | 799 | else if (cpu_is_mx21()) |
e9f49d41 | 800 | imx_dmav1_baseaddr = MX21_IO_ADDRESS(MX21_DMA_BASE_ADDR); |
6b66ef01 | 801 | else if (cpu_is_mx27()) |
e9f49d41 UKK |
802 | imx_dmav1_baseaddr = MX27_IO_ADDRESS(MX27_DMA_BASE_ADDR); |
803 | else | |
8bffb77e | 804 | return 0; |
e9f49d41 | 805 | |
e65fb009 | 806 | dma_clk = clk_get(NULL, "dma"); |
abebbb46 VK |
807 | if (IS_ERR(dma_clk)) |
808 | return PTR_ERR(dma_clk); | |
58a85f46 SH |
809 | clk_enable(dma_clk); |
810 | ||
811 | /* reset DMA module */ | |
e9f49d41 | 812 | imx_dmav1_writel(DCR_DRST, DMA_DCR); |
58a85f46 | 813 | |
8735fde2 UKK |
814 | if (cpu_is_mx1()) { |
815 | ret = request_irq(MX1_DMA_INT, dma_irq_handler, 0, "DMA", NULL); | |
816 | if (ret) { | |
817 | pr_crit("Wow! Can't register IRQ for DMA\n"); | |
818 | return ret; | |
819 | } | |
58a85f46 | 820 | |
8735fde2 UKK |
821 | ret = request_irq(MX1_DMA_ERR, dma_err_handler, 0, "DMA", NULL); |
822 | if (ret) { | |
823 | pr_crit("Wow! Can't register ERRIRQ for DMA\n"); | |
824 | free_irq(MX1_DMA_INT, NULL); | |
825 | return ret; | |
826 | } | |
58a85f46 | 827 | } |
6b66ef01 | 828 | |
58a85f46 | 829 | /* enable DMA module */ |
e9f49d41 | 830 | imx_dmav1_writel(DCR_DEN, DMA_DCR); |
58a85f46 SH |
831 | |
832 | /* clear all interrupts */ | |
e9f49d41 | 833 | imx_dmav1_writel((1 << IMX_DMA_CHANNELS) - 1, DMA_DISR); |
58a85f46 SH |
834 | |
835 | /* disable interrupts */ | |
e9f49d41 | 836 | imx_dmav1_writel((1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR); |
58a85f46 SH |
837 | |
838 | for (i = 0; i < IMX_DMA_CHANNELS; i++) { | |
839 | imx_dma_channels[i].sg = NULL; | |
840 | imx_dma_channels[i].dma_num = i; | |
841 | } | |
842 | ||
843 | return ret; | |
844 | } | |
845 | ||
846 | arch_initcall(imx_dma_init); |