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ddeccb8d HS |
1 | /* |
2 | * S3C24XX DMA handling | |
3 | * | |
4 | * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de> | |
5 | * | |
6 | * based on amba-pl08x.c | |
7 | * | |
8 | * Copyright (c) 2006 ARM Ltd. | |
9 | * Copyright (c) 2010 ST-Ericsson SA | |
10 | * | |
11 | * Author: Peter Pearse <peter.pearse@arm.com> | |
12 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify it | |
15 | * under the terms of the GNU General Public License as published by the Free | |
16 | * Software Foundation; either version 2 of the License, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | * The DMA controllers in S3C24XX SoCs have a varying number of DMA signals | |
20 | * that can be routed to any of the 4 to 8 hardware-channels. | |
21 | * | |
22 | * Therefore on these DMA controllers the number of channels | |
23 | * and the number of incoming DMA signals are two totally different things. | |
24 | * It is usually not possible to theoretically handle all physical signals, | |
25 | * so a multiplexing scheme with possible denial of use is necessary. | |
26 | * | |
27 | * Open items: | |
28 | * - bursts | |
29 | */ | |
30 | ||
31 | #include <linux/platform_device.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/dmaengine.h> | |
34 | #include <linux/dma-mapping.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/clk.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/platform_data/dma-s3c24xx.h> | |
40 | ||
41 | #include "dmaengine.h" | |
42 | #include "virt-dma.h" | |
43 | ||
44 | #define MAX_DMA_CHANNELS 8 | |
45 | ||
46 | #define S3C24XX_DISRC 0x00 | |
47 | #define S3C24XX_DISRCC 0x04 | |
48 | #define S3C24XX_DISRCC_INC_INCREMENT 0 | |
49 | #define S3C24XX_DISRCC_INC_FIXED BIT(0) | |
50 | #define S3C24XX_DISRCC_LOC_AHB 0 | |
51 | #define S3C24XX_DISRCC_LOC_APB BIT(1) | |
52 | ||
53 | #define S3C24XX_DIDST 0x08 | |
54 | #define S3C24XX_DIDSTC 0x0c | |
55 | #define S3C24XX_DIDSTC_INC_INCREMENT 0 | |
56 | #define S3C24XX_DIDSTC_INC_FIXED BIT(0) | |
57 | #define S3C24XX_DIDSTC_LOC_AHB 0 | |
58 | #define S3C24XX_DIDSTC_LOC_APB BIT(1) | |
59 | #define S3C24XX_DIDSTC_INT_TC0 0 | |
60 | #define S3C24XX_DIDSTC_INT_RELOAD BIT(2) | |
61 | ||
62 | #define S3C24XX_DCON 0x10 | |
63 | ||
64 | #define S3C24XX_DCON_TC_MASK 0xfffff | |
65 | #define S3C24XX_DCON_DSZ_BYTE (0 << 20) | |
66 | #define S3C24XX_DCON_DSZ_HALFWORD (1 << 20) | |
67 | #define S3C24XX_DCON_DSZ_WORD (2 << 20) | |
68 | #define S3C24XX_DCON_DSZ_MASK (3 << 20) | |
69 | #define S3C24XX_DCON_DSZ_SHIFT 20 | |
70 | #define S3C24XX_DCON_AUTORELOAD 0 | |
71 | #define S3C24XX_DCON_NORELOAD BIT(22) | |
72 | #define S3C24XX_DCON_HWTRIG BIT(23) | |
73 | #define S3C24XX_DCON_HWSRC_SHIFT 24 | |
74 | #define S3C24XX_DCON_SERV_SINGLE 0 | |
75 | #define S3C24XX_DCON_SERV_WHOLE BIT(27) | |
76 | #define S3C24XX_DCON_TSZ_UNIT 0 | |
77 | #define S3C24XX_DCON_TSZ_BURST4 BIT(28) | |
78 | #define S3C24XX_DCON_INT BIT(29) | |
79 | #define S3C24XX_DCON_SYNC_PCLK 0 | |
80 | #define S3C24XX_DCON_SYNC_HCLK BIT(30) | |
81 | #define S3C24XX_DCON_DEMAND 0 | |
82 | #define S3C24XX_DCON_HANDSHAKE BIT(31) | |
83 | ||
84 | #define S3C24XX_DSTAT 0x14 | |
85 | #define S3C24XX_DSTAT_STAT_BUSY BIT(20) | |
86 | #define S3C24XX_DSTAT_CURRTC_MASK 0xfffff | |
87 | ||
88 | #define S3C24XX_DMASKTRIG 0x20 | |
89 | #define S3C24XX_DMASKTRIG_SWTRIG BIT(0) | |
90 | #define S3C24XX_DMASKTRIG_ON BIT(1) | |
91 | #define S3C24XX_DMASKTRIG_STOP BIT(2) | |
92 | ||
93 | #define S3C24XX_DMAREQSEL 0x24 | |
94 | #define S3C24XX_DMAREQSEL_HW BIT(0) | |
95 | ||
96 | /* | |
97 | * S3C2410, S3C2440 and S3C2442 SoCs cannot select any physical channel | |
98 | * for a DMA source. Instead only specific channels are valid. | |
99 | * All of these SoCs have 4 physical channels and the number of request | |
100 | * source bits is 3. Additionally we also need 1 bit to mark the channel | |
101 | * as valid. | |
102 | * Therefore we separate the chansel element of the channel data into 4 | |
103 | * parts of 4 bits each, to hold the information if the channel is valid | |
104 | * and the hw request source to use. | |
105 | * | |
106 | * Example: | |
107 | * SDI is valid on channels 0, 2 and 3 - with varying hw request sources. | |
108 | * For it the chansel field would look like | |
109 | * | |
110 | * ((BIT(3) | 1) << 3 * 4) | // channel 3, with request source 1 | |
111 | * ((BIT(3) | 2) << 2 * 4) | // channel 2, with request source 2 | |
112 | * ((BIT(3) | 2) << 0 * 4) // channel 0, with request source 2 | |
113 | */ | |
114 | #define S3C24XX_CHANSEL_WIDTH 4 | |
115 | #define S3C24XX_CHANSEL_VALID BIT(3) | |
116 | #define S3C24XX_CHANSEL_REQ_MASK 7 | |
117 | ||
118 | /* | |
119 | * struct soc_data - vendor-specific config parameters for individual SoCs | |
120 | * @stride: spacing between the registers of each channel | |
121 | * @has_reqsel: does the controller use the newer requestselection mechanism | |
122 | * @has_clocks: are controllable dma-clocks present | |
123 | */ | |
124 | struct soc_data { | |
125 | int stride; | |
126 | bool has_reqsel; | |
127 | bool has_clocks; | |
128 | }; | |
129 | ||
130 | /* | |
131 | * enum s3c24xx_dma_chan_state - holds the virtual channel states | |
132 | * @S3C24XX_DMA_CHAN_IDLE: the channel is idle | |
133 | * @S3C24XX_DMA_CHAN_RUNNING: the channel has allocated a physical transport | |
134 | * channel and is running a transfer on it | |
135 | * @S3C24XX_DMA_CHAN_WAITING: the channel is waiting for a physical transport | |
136 | * channel to become available (only pertains to memcpy channels) | |
137 | */ | |
138 | enum s3c24xx_dma_chan_state { | |
139 | S3C24XX_DMA_CHAN_IDLE, | |
140 | S3C24XX_DMA_CHAN_RUNNING, | |
141 | S3C24XX_DMA_CHAN_WAITING, | |
142 | }; | |
143 | ||
144 | /* | |
145 | * struct s3c24xx_sg - structure containing data per sg | |
146 | * @src_addr: src address of sg | |
147 | * @dst_addr: dst address of sg | |
148 | * @len: transfer len in bytes | |
149 | * @node: node for txd's dsg_list | |
150 | */ | |
151 | struct s3c24xx_sg { | |
152 | dma_addr_t src_addr; | |
153 | dma_addr_t dst_addr; | |
154 | size_t len; | |
155 | struct list_head node; | |
156 | }; | |
157 | ||
158 | /* | |
159 | * struct s3c24xx_txd - wrapper for struct dma_async_tx_descriptor | |
160 | * @vd: virtual DMA descriptor | |
161 | * @dsg_list: list of children sg's | |
162 | * @at: sg currently being transfered | |
163 | * @width: transfer width | |
164 | * @disrcc: value for source control register | |
165 | * @didstc: value for destination control register | |
166 | * @dcon: base value for dcon register | |
167 | */ | |
168 | struct s3c24xx_txd { | |
169 | struct virt_dma_desc vd; | |
170 | struct list_head dsg_list; | |
171 | struct list_head *at; | |
172 | u8 width; | |
173 | u32 disrcc; | |
174 | u32 didstc; | |
175 | u32 dcon; | |
176 | }; | |
177 | ||
178 | struct s3c24xx_dma_chan; | |
179 | ||
180 | /* | |
181 | * struct s3c24xx_dma_phy - holder for the physical channels | |
182 | * @id: physical index to this channel | |
183 | * @valid: does the channel have all required elements | |
184 | * @base: virtual memory base (remapped) for the this channel | |
185 | * @irq: interrupt for this channel | |
186 | * @clk: clock for this channel | |
187 | * @lock: a lock to use when altering an instance of this struct | |
188 | * @serving: virtual channel currently being served by this physicalchannel | |
189 | * @host: a pointer to the host (internal use) | |
190 | */ | |
191 | struct s3c24xx_dma_phy { | |
192 | unsigned int id; | |
193 | bool valid; | |
194 | void __iomem *base; | |
195 | unsigned int irq; | |
196 | struct clk *clk; | |
197 | spinlock_t lock; | |
198 | struct s3c24xx_dma_chan *serving; | |
199 | struct s3c24xx_dma_engine *host; | |
200 | }; | |
201 | ||
202 | /* | |
203 | * struct s3c24xx_dma_chan - this structure wraps a DMA ENGINE channel | |
204 | * @id: the id of the channel | |
205 | * @name: name of the channel | |
206 | * @vc: wrappped virtual channel | |
207 | * @phy: the physical channel utilized by this channel, if there is one | |
208 | * @runtime_addr: address for RX/TX according to the runtime config | |
209 | * @at: active transaction on this channel | |
210 | * @lock: a lock for this channel data | |
211 | * @host: a pointer to the host (internal use) | |
212 | * @state: whether the channel is idle, running etc | |
213 | * @slave: whether this channel is a device (slave) or for memcpy | |
214 | */ | |
215 | struct s3c24xx_dma_chan { | |
216 | int id; | |
217 | const char *name; | |
218 | struct virt_dma_chan vc; | |
219 | struct s3c24xx_dma_phy *phy; | |
220 | struct dma_slave_config cfg; | |
221 | struct s3c24xx_txd *at; | |
222 | struct s3c24xx_dma_engine *host; | |
223 | enum s3c24xx_dma_chan_state state; | |
224 | bool slave; | |
225 | }; | |
226 | ||
227 | /* | |
228 | * struct s3c24xx_dma_engine - the local state holder for the S3C24XX | |
229 | * @pdev: the corresponding platform device | |
230 | * @pdata: platform data passed in from the platform/machine | |
231 | * @base: virtual memory base (remapped) | |
232 | * @slave: slave engine for this instance | |
233 | * @memcpy: memcpy engine for this instance | |
234 | * @phy_chans: array of data for the physical channels | |
235 | */ | |
236 | struct s3c24xx_dma_engine { | |
237 | struct platform_device *pdev; | |
238 | const struct s3c24xx_dma_platdata *pdata; | |
239 | struct soc_data *sdata; | |
240 | void __iomem *base; | |
241 | struct dma_device slave; | |
242 | struct dma_device memcpy; | |
243 | struct s3c24xx_dma_phy *phy_chans; | |
244 | }; | |
245 | ||
246 | /* | |
247 | * Physical channel handling | |
248 | */ | |
249 | ||
250 | /* | |
251 | * Check whether a certain channel is busy or not. | |
252 | */ | |
253 | static int s3c24xx_dma_phy_busy(struct s3c24xx_dma_phy *phy) | |
254 | { | |
255 | unsigned int val = readl(phy->base + S3C24XX_DSTAT); | |
256 | return val & S3C24XX_DSTAT_STAT_BUSY; | |
257 | } | |
258 | ||
259 | static bool s3c24xx_dma_phy_valid(struct s3c24xx_dma_chan *s3cchan, | |
260 | struct s3c24xx_dma_phy *phy) | |
261 | { | |
262 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
263 | const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; | |
264 | struct s3c24xx_dma_channel *cdata = &pdata->channels[s3cchan->id]; | |
265 | int phyvalid; | |
266 | ||
267 | /* every phy is valid for memcopy channels */ | |
268 | if (!s3cchan->slave) | |
269 | return true; | |
270 | ||
271 | /* On newer variants all phys can be used for all virtual channels */ | |
272 | if (s3cdma->sdata->has_reqsel) | |
273 | return true; | |
274 | ||
275 | phyvalid = (cdata->chansel >> (phy->id * S3C24XX_CHANSEL_WIDTH)); | |
276 | return (phyvalid & S3C24XX_CHANSEL_VALID) ? true : false; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Allocate a physical channel for a virtual channel | |
281 | * | |
282 | * Try to locate a physical channel to be used for this transfer. If all | |
283 | * are taken return NULL and the requester will have to cope by using | |
284 | * some fallback PIO mode or retrying later. | |
285 | */ | |
286 | static | |
287 | struct s3c24xx_dma_phy *s3c24xx_dma_get_phy(struct s3c24xx_dma_chan *s3cchan) | |
288 | { | |
289 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
290 | const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; | |
291 | struct s3c24xx_dma_channel *cdata; | |
292 | struct s3c24xx_dma_phy *phy = NULL; | |
293 | unsigned long flags; | |
294 | int i; | |
295 | int ret; | |
296 | ||
297 | if (s3cchan->slave) | |
298 | cdata = &pdata->channels[s3cchan->id]; | |
299 | ||
300 | for (i = 0; i < s3cdma->pdata->num_phy_channels; i++) { | |
301 | phy = &s3cdma->phy_chans[i]; | |
302 | ||
303 | if (!phy->valid) | |
304 | continue; | |
305 | ||
306 | if (!s3c24xx_dma_phy_valid(s3cchan, phy)) | |
307 | continue; | |
308 | ||
309 | spin_lock_irqsave(&phy->lock, flags); | |
310 | ||
311 | if (!phy->serving) { | |
312 | phy->serving = s3cchan; | |
313 | spin_unlock_irqrestore(&phy->lock, flags); | |
314 | break; | |
315 | } | |
316 | ||
317 | spin_unlock_irqrestore(&phy->lock, flags); | |
318 | } | |
319 | ||
320 | /* No physical channel available, cope with it */ | |
321 | if (i == s3cdma->pdata->num_phy_channels) { | |
322 | dev_warn(&s3cdma->pdev->dev, "no phy channel available\n"); | |
323 | return NULL; | |
324 | } | |
325 | ||
326 | /* start the phy clock */ | |
327 | if (s3cdma->sdata->has_clocks) { | |
328 | ret = clk_enable(phy->clk); | |
329 | if (ret) { | |
330 | dev_err(&s3cdma->pdev->dev, "could not enable clock for channel %d, err %d\n", | |
331 | phy->id, ret); | |
332 | phy->serving = NULL; | |
333 | return NULL; | |
334 | } | |
335 | } | |
336 | ||
337 | return phy; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Mark the physical channel as free. | |
342 | * | |
343 | * This drops the link between the physical and virtual channel. | |
344 | */ | |
345 | static inline void s3c24xx_dma_put_phy(struct s3c24xx_dma_phy *phy) | |
346 | { | |
347 | struct s3c24xx_dma_engine *s3cdma = phy->host; | |
348 | ||
349 | if (s3cdma->sdata->has_clocks) | |
350 | clk_disable(phy->clk); | |
351 | ||
352 | phy->serving = NULL; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Stops the channel by writing the stop bit. | |
357 | * This should not be used for an on-going transfer, but as a method of | |
358 | * shutting down a channel (eg, when it's no longer used) or terminating a | |
359 | * transfer. | |
360 | */ | |
361 | static void s3c24xx_dma_terminate_phy(struct s3c24xx_dma_phy *phy) | |
362 | { | |
363 | writel(S3C24XX_DMASKTRIG_STOP, phy->base + S3C24XX_DMASKTRIG); | |
364 | } | |
365 | ||
366 | /* | |
367 | * Virtual channel handling | |
368 | */ | |
369 | ||
370 | static inline | |
371 | struct s3c24xx_dma_chan *to_s3c24xx_dma_chan(struct dma_chan *chan) | |
372 | { | |
373 | return container_of(chan, struct s3c24xx_dma_chan, vc.chan); | |
374 | } | |
375 | ||
376 | static u32 s3c24xx_dma_getbytes_chan(struct s3c24xx_dma_chan *s3cchan) | |
377 | { | |
378 | struct s3c24xx_dma_phy *phy = s3cchan->phy; | |
379 | struct s3c24xx_txd *txd = s3cchan->at; | |
380 | u32 tc = readl(phy->base + S3C24XX_DSTAT) & S3C24XX_DSTAT_CURRTC_MASK; | |
381 | ||
382 | return tc * txd->width; | |
383 | } | |
384 | ||
385 | static int s3c24xx_dma_set_runtime_config(struct s3c24xx_dma_chan *s3cchan, | |
386 | struct dma_slave_config *config) | |
387 | { | |
388 | if (!s3cchan->slave) | |
389 | return -EINVAL; | |
390 | ||
391 | /* Reject definitely invalid configurations */ | |
392 | if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || | |
393 | config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) | |
394 | return -EINVAL; | |
395 | ||
396 | s3cchan->cfg = *config; | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Transfer handling | |
403 | */ | |
404 | ||
405 | static inline | |
406 | struct s3c24xx_txd *to_s3c24xx_txd(struct dma_async_tx_descriptor *tx) | |
407 | { | |
408 | return container_of(tx, struct s3c24xx_txd, vd.tx); | |
409 | } | |
410 | ||
411 | static struct s3c24xx_txd *s3c24xx_dma_get_txd(void) | |
412 | { | |
413 | struct s3c24xx_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); | |
414 | ||
415 | if (txd) { | |
416 | INIT_LIST_HEAD(&txd->dsg_list); | |
417 | txd->dcon = S3C24XX_DCON_INT | S3C24XX_DCON_NORELOAD; | |
418 | } | |
419 | ||
420 | return txd; | |
421 | } | |
422 | ||
423 | static void s3c24xx_dma_free_txd(struct s3c24xx_txd *txd) | |
424 | { | |
425 | struct s3c24xx_sg *dsg, *_dsg; | |
426 | ||
427 | list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { | |
428 | list_del(&dsg->node); | |
429 | kfree(dsg); | |
430 | } | |
431 | ||
432 | kfree(txd); | |
433 | } | |
434 | ||
435 | static void s3c24xx_dma_start_next_sg(struct s3c24xx_dma_chan *s3cchan, | |
436 | struct s3c24xx_txd *txd) | |
437 | { | |
438 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
439 | struct s3c24xx_dma_phy *phy = s3cchan->phy; | |
440 | const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; | |
441 | struct s3c24xx_sg *dsg = list_entry(txd->at, struct s3c24xx_sg, node); | |
442 | u32 dcon = txd->dcon; | |
443 | u32 val; | |
444 | ||
445 | /* transfer-size and -count from len and width */ | |
446 | switch (txd->width) { | |
447 | case 1: | |
448 | dcon |= S3C24XX_DCON_DSZ_BYTE | dsg->len; | |
449 | break; | |
450 | case 2: | |
451 | dcon |= S3C24XX_DCON_DSZ_HALFWORD | (dsg->len / 2); | |
452 | break; | |
453 | case 4: | |
454 | dcon |= S3C24XX_DCON_DSZ_WORD | (dsg->len / 4); | |
455 | break; | |
456 | } | |
457 | ||
458 | if (s3cchan->slave) { | |
459 | struct s3c24xx_dma_channel *cdata = | |
460 | &pdata->channels[s3cchan->id]; | |
461 | ||
462 | if (s3cdma->sdata->has_reqsel) { | |
463 | writel_relaxed((cdata->chansel << 1) | | |
464 | S3C24XX_DMAREQSEL_HW, | |
465 | phy->base + S3C24XX_DMAREQSEL); | |
466 | } else { | |
467 | int csel = cdata->chansel >> (phy->id * | |
468 | S3C24XX_CHANSEL_WIDTH); | |
469 | ||
470 | csel &= S3C24XX_CHANSEL_REQ_MASK; | |
471 | dcon |= csel << S3C24XX_DCON_HWSRC_SHIFT; | |
472 | dcon |= S3C24XX_DCON_HWTRIG; | |
473 | } | |
474 | } else { | |
475 | if (s3cdma->sdata->has_reqsel) | |
476 | writel_relaxed(0, phy->base + S3C24XX_DMAREQSEL); | |
477 | } | |
478 | ||
479 | writel_relaxed(dsg->src_addr, phy->base + S3C24XX_DISRC); | |
480 | writel_relaxed(txd->disrcc, phy->base + S3C24XX_DISRCC); | |
481 | writel_relaxed(dsg->dst_addr, phy->base + S3C24XX_DIDST); | |
482 | writel_relaxed(txd->didstc, phy->base + S3C24XX_DIDSTC); | |
483 | writel_relaxed(dcon, phy->base + S3C24XX_DCON); | |
484 | ||
485 | val = readl_relaxed(phy->base + S3C24XX_DMASKTRIG); | |
486 | val &= ~S3C24XX_DMASKTRIG_STOP; | |
487 | val |= S3C24XX_DMASKTRIG_ON; | |
488 | ||
489 | /* trigger the dma operation for memcpy transfers */ | |
490 | if (!s3cchan->slave) | |
491 | val |= S3C24XX_DMASKTRIG_SWTRIG; | |
492 | ||
493 | writel(val, phy->base + S3C24XX_DMASKTRIG); | |
494 | } | |
495 | ||
496 | /* | |
497 | * Set the initial DMA register values and start first sg. | |
498 | */ | |
499 | static void s3c24xx_dma_start_next_txd(struct s3c24xx_dma_chan *s3cchan) | |
500 | { | |
501 | struct s3c24xx_dma_phy *phy = s3cchan->phy; | |
502 | struct virt_dma_desc *vd = vchan_next_desc(&s3cchan->vc); | |
503 | struct s3c24xx_txd *txd = to_s3c24xx_txd(&vd->tx); | |
504 | ||
505 | list_del(&txd->vd.node); | |
506 | ||
507 | s3cchan->at = txd; | |
508 | ||
509 | /* Wait for channel inactive */ | |
510 | while (s3c24xx_dma_phy_busy(phy)) | |
511 | cpu_relax(); | |
512 | ||
513 | /* point to the first element of the sg list */ | |
514 | txd->at = txd->dsg_list.next; | |
515 | s3c24xx_dma_start_next_sg(s3cchan, txd); | |
516 | } | |
517 | ||
518 | static void s3c24xx_dma_free_txd_list(struct s3c24xx_dma_engine *s3cdma, | |
519 | struct s3c24xx_dma_chan *s3cchan) | |
520 | { | |
521 | LIST_HEAD(head); | |
522 | ||
523 | vchan_get_all_descriptors(&s3cchan->vc, &head); | |
524 | vchan_dma_desc_free_list(&s3cchan->vc, &head); | |
525 | } | |
526 | ||
527 | /* | |
528 | * Try to allocate a physical channel. When successful, assign it to | |
529 | * this virtual channel, and initiate the next descriptor. The | |
530 | * virtual channel lock must be held at this point. | |
531 | */ | |
532 | static void s3c24xx_dma_phy_alloc_and_start(struct s3c24xx_dma_chan *s3cchan) | |
533 | { | |
534 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
535 | struct s3c24xx_dma_phy *phy; | |
536 | ||
537 | phy = s3c24xx_dma_get_phy(s3cchan); | |
538 | if (!phy) { | |
539 | dev_dbg(&s3cdma->pdev->dev, "no physical channel available for xfer on %s\n", | |
540 | s3cchan->name); | |
541 | s3cchan->state = S3C24XX_DMA_CHAN_WAITING; | |
542 | return; | |
543 | } | |
544 | ||
545 | dev_dbg(&s3cdma->pdev->dev, "allocated physical channel %d for xfer on %s\n", | |
546 | phy->id, s3cchan->name); | |
547 | ||
548 | s3cchan->phy = phy; | |
549 | s3cchan->state = S3C24XX_DMA_CHAN_RUNNING; | |
550 | ||
551 | s3c24xx_dma_start_next_txd(s3cchan); | |
552 | } | |
553 | ||
554 | static void s3c24xx_dma_phy_reassign_start(struct s3c24xx_dma_phy *phy, | |
555 | struct s3c24xx_dma_chan *s3cchan) | |
556 | { | |
557 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
558 | ||
559 | dev_dbg(&s3cdma->pdev->dev, "reassigned physical channel %d for xfer on %s\n", | |
560 | phy->id, s3cchan->name); | |
561 | ||
562 | /* | |
563 | * We do this without taking the lock; we're really only concerned | |
564 | * about whether this pointer is NULL or not, and we're guaranteed | |
565 | * that this will only be called when it _already_ is non-NULL. | |
566 | */ | |
567 | phy->serving = s3cchan; | |
568 | s3cchan->phy = phy; | |
569 | s3cchan->state = S3C24XX_DMA_CHAN_RUNNING; | |
570 | s3c24xx_dma_start_next_txd(s3cchan); | |
571 | } | |
572 | ||
573 | /* | |
574 | * Free a physical DMA channel, potentially reallocating it to another | |
575 | * virtual channel if we have any pending. | |
576 | */ | |
577 | static void s3c24xx_dma_phy_free(struct s3c24xx_dma_chan *s3cchan) | |
578 | { | |
579 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
580 | struct s3c24xx_dma_chan *p, *next; | |
581 | ||
582 | retry: | |
583 | next = NULL; | |
584 | ||
585 | /* Find a waiting virtual channel for the next transfer. */ | |
586 | list_for_each_entry(p, &s3cdma->memcpy.channels, vc.chan.device_node) | |
587 | if (p->state == S3C24XX_DMA_CHAN_WAITING) { | |
588 | next = p; | |
589 | break; | |
590 | } | |
591 | ||
592 | if (!next) { | |
593 | list_for_each_entry(p, &s3cdma->slave.channels, | |
594 | vc.chan.device_node) | |
595 | if (p->state == S3C24XX_DMA_CHAN_WAITING && | |
596 | s3c24xx_dma_phy_valid(p, s3cchan->phy)) { | |
597 | next = p; | |
598 | break; | |
599 | } | |
600 | } | |
601 | ||
602 | /* Ensure that the physical channel is stopped */ | |
603 | s3c24xx_dma_terminate_phy(s3cchan->phy); | |
604 | ||
605 | if (next) { | |
606 | bool success; | |
607 | ||
608 | /* | |
609 | * Eww. We know this isn't going to deadlock | |
610 | * but lockdep probably doesn't. | |
611 | */ | |
612 | spin_lock(&next->vc.lock); | |
613 | /* Re-check the state now that we have the lock */ | |
614 | success = next->state == S3C24XX_DMA_CHAN_WAITING; | |
615 | if (success) | |
616 | s3c24xx_dma_phy_reassign_start(s3cchan->phy, next); | |
617 | spin_unlock(&next->vc.lock); | |
618 | ||
619 | /* If the state changed, try to find another channel */ | |
620 | if (!success) | |
621 | goto retry; | |
622 | } else { | |
623 | /* No more jobs, so free up the physical channel */ | |
624 | s3c24xx_dma_put_phy(s3cchan->phy); | |
625 | } | |
626 | ||
627 | s3cchan->phy = NULL; | |
628 | s3cchan->state = S3C24XX_DMA_CHAN_IDLE; | |
629 | } | |
630 | ||
ddeccb8d HS |
631 | static void s3c24xx_dma_desc_free(struct virt_dma_desc *vd) |
632 | { | |
633 | struct s3c24xx_txd *txd = to_s3c24xx_txd(&vd->tx); | |
634 | struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(vd->tx.chan); | |
635 | ||
636 | if (!s3cchan->slave) | |
85726def | 637 | dma_descriptor_unmap(&vd->tx); |
ddeccb8d HS |
638 | |
639 | s3c24xx_dma_free_txd(txd); | |
640 | } | |
641 | ||
642 | static irqreturn_t s3c24xx_dma_irq(int irq, void *data) | |
643 | { | |
644 | struct s3c24xx_dma_phy *phy = data; | |
645 | struct s3c24xx_dma_chan *s3cchan = phy->serving; | |
646 | struct s3c24xx_txd *txd; | |
647 | ||
648 | dev_dbg(&phy->host->pdev->dev, "interrupt on channel %d\n", phy->id); | |
649 | ||
650 | /* | |
651 | * Interrupts happen to notify the completion of a transfer and the | |
652 | * channel should have moved into its stop state already on its own. | |
653 | * Therefore interrupts on channels not bound to a virtual channel | |
654 | * should never happen. Nevertheless send a terminate command to the | |
655 | * channel if the unlikely case happens. | |
656 | */ | |
657 | if (unlikely(!s3cchan)) { | |
658 | dev_err(&phy->host->pdev->dev, "interrupt on unused channel %d\n", | |
659 | phy->id); | |
660 | ||
661 | s3c24xx_dma_terminate_phy(phy); | |
662 | ||
663 | return IRQ_HANDLED; | |
664 | } | |
665 | ||
666 | spin_lock(&s3cchan->vc.lock); | |
667 | txd = s3cchan->at; | |
668 | if (txd) { | |
669 | /* when more sg's are in this txd, start the next one */ | |
670 | if (!list_is_last(txd->at, &txd->dsg_list)) { | |
671 | txd->at = txd->at->next; | |
672 | s3c24xx_dma_start_next_sg(s3cchan, txd); | |
673 | } else { | |
674 | s3cchan->at = NULL; | |
675 | vchan_cookie_complete(&txd->vd); | |
676 | ||
677 | /* | |
678 | * And start the next descriptor (if any), | |
679 | * otherwise free this channel. | |
680 | */ | |
681 | if (vchan_next_desc(&s3cchan->vc)) | |
682 | s3c24xx_dma_start_next_txd(s3cchan); | |
683 | else | |
684 | s3c24xx_dma_phy_free(s3cchan); | |
685 | } | |
686 | } | |
687 | spin_unlock(&s3cchan->vc.lock); | |
688 | ||
689 | return IRQ_HANDLED; | |
690 | } | |
691 | ||
692 | /* | |
693 | * The DMA ENGINE API | |
694 | */ | |
695 | ||
696 | static int s3c24xx_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
697 | unsigned long arg) | |
698 | { | |
699 | struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); | |
700 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
701 | unsigned long flags; | |
702 | int ret = 0; | |
703 | ||
704 | spin_lock_irqsave(&s3cchan->vc.lock, flags); | |
705 | ||
706 | switch (cmd) { | |
707 | case DMA_SLAVE_CONFIG: | |
708 | ret = s3c24xx_dma_set_runtime_config(s3cchan, | |
709 | (struct dma_slave_config *)arg); | |
710 | break; | |
711 | case DMA_TERMINATE_ALL: | |
712 | if (!s3cchan->phy && !s3cchan->at) { | |
713 | dev_err(&s3cdma->pdev->dev, "trying to terminate already stopped channel %d\n", | |
714 | s3cchan->id); | |
715 | ret = -EINVAL; | |
716 | break; | |
717 | } | |
718 | ||
719 | s3cchan->state = S3C24XX_DMA_CHAN_IDLE; | |
720 | ||
721 | /* Mark physical channel as free */ | |
722 | if (s3cchan->phy) | |
723 | s3c24xx_dma_phy_free(s3cchan); | |
724 | ||
725 | /* Dequeue current job */ | |
726 | if (s3cchan->at) { | |
727 | s3c24xx_dma_desc_free(&s3cchan->at->vd); | |
728 | s3cchan->at = NULL; | |
729 | } | |
730 | ||
731 | /* Dequeue jobs not yet fired as well */ | |
732 | s3c24xx_dma_free_txd_list(s3cdma, s3cchan); | |
733 | break; | |
734 | default: | |
735 | /* Unknown command */ | |
736 | ret = -ENXIO; | |
737 | break; | |
738 | } | |
739 | ||
740 | spin_unlock_irqrestore(&s3cchan->vc.lock, flags); | |
741 | ||
742 | return ret; | |
743 | } | |
744 | ||
745 | static int s3c24xx_dma_alloc_chan_resources(struct dma_chan *chan) | |
746 | { | |
747 | return 0; | |
748 | } | |
749 | ||
750 | static void s3c24xx_dma_free_chan_resources(struct dma_chan *chan) | |
751 | { | |
752 | /* Ensure all queued descriptors are freed */ | |
753 | vchan_free_chan_resources(to_virt_chan(chan)); | |
754 | } | |
755 | ||
756 | static enum dma_status s3c24xx_dma_tx_status(struct dma_chan *chan, | |
757 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
758 | { | |
759 | struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); | |
760 | struct s3c24xx_txd *txd; | |
761 | struct s3c24xx_sg *dsg; | |
762 | struct virt_dma_desc *vd; | |
763 | unsigned long flags; | |
764 | enum dma_status ret; | |
765 | size_t bytes = 0; | |
766 | ||
767 | spin_lock_irqsave(&s3cchan->vc.lock, flags); | |
768 | ret = dma_cookie_status(chan, cookie, txstate); | |
415612c1 | 769 | if (ret == DMA_COMPLETE) { |
ddeccb8d HS |
770 | spin_unlock_irqrestore(&s3cchan->vc.lock, flags); |
771 | return ret; | |
772 | } | |
773 | ||
774 | /* | |
775 | * There's no point calculating the residue if there's | |
776 | * no txstate to store the value. | |
777 | */ | |
778 | if (!txstate) { | |
779 | spin_unlock_irqrestore(&s3cchan->vc.lock, flags); | |
780 | return ret; | |
781 | } | |
782 | ||
783 | vd = vchan_find_desc(&s3cchan->vc, cookie); | |
784 | if (vd) { | |
785 | /* On the issued list, so hasn't been processed yet */ | |
786 | txd = to_s3c24xx_txd(&vd->tx); | |
787 | ||
788 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
789 | bytes += dsg->len; | |
790 | } else { | |
791 | /* | |
792 | * Currently running, so sum over the pending sg's and | |
793 | * the currently active one. | |
794 | */ | |
795 | txd = s3cchan->at; | |
796 | ||
797 | dsg = list_entry(txd->at, struct s3c24xx_sg, node); | |
798 | list_for_each_entry_from(dsg, &txd->dsg_list, node) | |
799 | bytes += dsg->len; | |
800 | ||
801 | bytes += s3c24xx_dma_getbytes_chan(s3cchan); | |
802 | } | |
803 | spin_unlock_irqrestore(&s3cchan->vc.lock, flags); | |
804 | ||
805 | /* | |
806 | * This cookie not complete yet | |
807 | * Get number of bytes left in the active transactions and queue | |
808 | */ | |
809 | dma_set_residue(txstate, bytes); | |
810 | ||
811 | /* Whether waiting or running, we're in progress */ | |
812 | return ret; | |
813 | } | |
814 | ||
815 | /* | |
816 | * Initialize a descriptor to be used by memcpy submit | |
817 | */ | |
818 | static struct dma_async_tx_descriptor *s3c24xx_dma_prep_memcpy( | |
819 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
820 | size_t len, unsigned long flags) | |
821 | { | |
822 | struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); | |
823 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
824 | struct s3c24xx_txd *txd; | |
825 | struct s3c24xx_sg *dsg; | |
826 | int src_mod, dest_mod; | |
827 | ||
828 | dev_dbg(&s3cdma->pdev->dev, "prepare memcpy of %d bytes from %s\n", | |
829 | len, s3cchan->name); | |
830 | ||
831 | if ((len & S3C24XX_DCON_TC_MASK) != len) { | |
832 | dev_err(&s3cdma->pdev->dev, "memcpy size %d to large\n", len); | |
833 | return NULL; | |
834 | } | |
835 | ||
836 | txd = s3c24xx_dma_get_txd(); | |
837 | if (!txd) | |
838 | return NULL; | |
839 | ||
840 | dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT); | |
841 | if (!dsg) { | |
842 | s3c24xx_dma_free_txd(txd); | |
843 | return NULL; | |
844 | } | |
845 | list_add_tail(&dsg->node, &txd->dsg_list); | |
846 | ||
847 | dsg->src_addr = src; | |
848 | dsg->dst_addr = dest; | |
849 | dsg->len = len; | |
850 | ||
851 | /* | |
852 | * Determine a suitable transfer width. | |
853 | * The DMA controller cannot fetch/store information which is not | |
854 | * naturally aligned on the bus, i.e., a 4 byte fetch must start at | |
855 | * an address divisible by 4 - more generally addr % width must be 0. | |
856 | */ | |
857 | src_mod = src % 4; | |
858 | dest_mod = dest % 4; | |
859 | switch (len % 4) { | |
860 | case 0: | |
861 | txd->width = (src_mod == 0 && dest_mod == 0) ? 4 : 1; | |
862 | break; | |
863 | case 2: | |
864 | txd->width = ((src_mod == 2 || src_mod == 0) && | |
865 | (dest_mod == 2 || dest_mod == 0)) ? 2 : 1; | |
866 | break; | |
867 | default: | |
868 | txd->width = 1; | |
869 | break; | |
870 | } | |
871 | ||
872 | txd->disrcc = S3C24XX_DISRCC_LOC_AHB | S3C24XX_DISRCC_INC_INCREMENT; | |
873 | txd->didstc = S3C24XX_DIDSTC_LOC_AHB | S3C24XX_DIDSTC_INC_INCREMENT; | |
874 | txd->dcon |= S3C24XX_DCON_DEMAND | S3C24XX_DCON_SYNC_HCLK | | |
875 | S3C24XX_DCON_SERV_WHOLE; | |
876 | ||
877 | return vchan_tx_prep(&s3cchan->vc, &txd->vd, flags); | |
878 | } | |
879 | ||
880 | static struct dma_async_tx_descriptor *s3c24xx_dma_prep_slave_sg( | |
881 | struct dma_chan *chan, struct scatterlist *sgl, | |
882 | unsigned int sg_len, enum dma_transfer_direction direction, | |
883 | unsigned long flags, void *context) | |
884 | { | |
885 | struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); | |
886 | struct s3c24xx_dma_engine *s3cdma = s3cchan->host; | |
887 | const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; | |
888 | struct s3c24xx_dma_channel *cdata = &pdata->channels[s3cchan->id]; | |
889 | struct s3c24xx_txd *txd; | |
890 | struct s3c24xx_sg *dsg; | |
891 | struct scatterlist *sg; | |
892 | dma_addr_t slave_addr; | |
893 | u32 hwcfg = 0; | |
894 | int tmp; | |
895 | ||
896 | dev_dbg(&s3cdma->pdev->dev, "prepare transaction of %d bytes from %s\n", | |
897 | sg_dma_len(sgl), s3cchan->name); | |
898 | ||
899 | txd = s3c24xx_dma_get_txd(); | |
900 | if (!txd) | |
901 | return NULL; | |
902 | ||
903 | if (cdata->handshake) | |
904 | txd->dcon |= S3C24XX_DCON_HANDSHAKE; | |
905 | ||
906 | switch (cdata->bus) { | |
907 | case S3C24XX_DMA_APB: | |
908 | txd->dcon |= S3C24XX_DCON_SYNC_PCLK; | |
909 | hwcfg |= S3C24XX_DISRCC_LOC_APB; | |
910 | break; | |
911 | case S3C24XX_DMA_AHB: | |
912 | txd->dcon |= S3C24XX_DCON_SYNC_HCLK; | |
913 | hwcfg |= S3C24XX_DISRCC_LOC_AHB; | |
914 | break; | |
915 | } | |
916 | ||
917 | /* | |
918 | * Always assume our peripheral desintation is a fixed | |
919 | * address in memory. | |
920 | */ | |
921 | hwcfg |= S3C24XX_DISRCC_INC_FIXED; | |
922 | ||
923 | /* | |
924 | * Individual dma operations are requested by the slave, | |
925 | * so serve only single atomic operations (S3C24XX_DCON_SERV_SINGLE). | |
926 | */ | |
927 | txd->dcon |= S3C24XX_DCON_SERV_SINGLE; | |
928 | ||
929 | if (direction == DMA_MEM_TO_DEV) { | |
930 | txd->disrcc = S3C24XX_DISRCC_LOC_AHB | | |
931 | S3C24XX_DISRCC_INC_INCREMENT; | |
932 | txd->didstc = hwcfg; | |
933 | slave_addr = s3cchan->cfg.dst_addr; | |
934 | txd->width = s3cchan->cfg.dst_addr_width; | |
935 | } else if (direction == DMA_DEV_TO_MEM) { | |
936 | txd->disrcc = hwcfg; | |
937 | txd->didstc = S3C24XX_DIDSTC_LOC_AHB | | |
938 | S3C24XX_DIDSTC_INC_INCREMENT; | |
939 | slave_addr = s3cchan->cfg.src_addr; | |
940 | txd->width = s3cchan->cfg.src_addr_width; | |
941 | } else { | |
942 | s3c24xx_dma_free_txd(txd); | |
943 | dev_err(&s3cdma->pdev->dev, | |
944 | "direction %d unsupported\n", direction); | |
945 | return NULL; | |
946 | } | |
947 | ||
948 | for_each_sg(sgl, sg, sg_len, tmp) { | |
949 | dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT); | |
950 | if (!dsg) { | |
951 | s3c24xx_dma_free_txd(txd); | |
952 | return NULL; | |
953 | } | |
954 | list_add_tail(&dsg->node, &txd->dsg_list); | |
955 | ||
956 | dsg->len = sg_dma_len(sg); | |
957 | if (direction == DMA_MEM_TO_DEV) { | |
958 | dsg->src_addr = sg_dma_address(sg); | |
959 | dsg->dst_addr = slave_addr; | |
960 | } else { /* DMA_DEV_TO_MEM */ | |
961 | dsg->src_addr = slave_addr; | |
962 | dsg->dst_addr = sg_dma_address(sg); | |
963 | } | |
964 | break; | |
965 | } | |
966 | ||
967 | return vchan_tx_prep(&s3cchan->vc, &txd->vd, flags); | |
968 | } | |
969 | ||
970 | /* | |
971 | * Slave transactions callback to the slave device to allow | |
972 | * synchronization of slave DMA signals with the DMAC enable | |
973 | */ | |
974 | static void s3c24xx_dma_issue_pending(struct dma_chan *chan) | |
975 | { | |
976 | struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); | |
977 | unsigned long flags; | |
978 | ||
979 | spin_lock_irqsave(&s3cchan->vc.lock, flags); | |
980 | if (vchan_issue_pending(&s3cchan->vc)) { | |
981 | if (!s3cchan->phy && s3cchan->state != S3C24XX_DMA_CHAN_WAITING) | |
982 | s3c24xx_dma_phy_alloc_and_start(s3cchan); | |
983 | } | |
984 | spin_unlock_irqrestore(&s3cchan->vc.lock, flags); | |
985 | } | |
986 | ||
987 | /* | |
988 | * Bringup and teardown | |
989 | */ | |
990 | ||
991 | /* | |
992 | * Initialise the DMAC memcpy/slave channels. | |
993 | * Make a local wrapper to hold required data | |
994 | */ | |
995 | static int s3c24xx_dma_init_virtual_channels(struct s3c24xx_dma_engine *s3cdma, | |
996 | struct dma_device *dmadev, unsigned int channels, bool slave) | |
997 | { | |
998 | struct s3c24xx_dma_chan *chan; | |
999 | int i; | |
1000 | ||
1001 | INIT_LIST_HEAD(&dmadev->channels); | |
1002 | ||
1003 | /* | |
1004 | * Register as many many memcpy as we have physical channels, | |
1005 | * we won't always be able to use all but the code will have | |
1006 | * to cope with that situation. | |
1007 | */ | |
1008 | for (i = 0; i < channels; i++) { | |
1009 | chan = devm_kzalloc(dmadev->dev, sizeof(*chan), GFP_KERNEL); | |
1010 | if (!chan) { | |
1011 | dev_err(dmadev->dev, | |
1012 | "%s no memory for channel\n", __func__); | |
1013 | return -ENOMEM; | |
1014 | } | |
1015 | ||
1016 | chan->id = i; | |
1017 | chan->host = s3cdma; | |
1018 | chan->state = S3C24XX_DMA_CHAN_IDLE; | |
1019 | ||
1020 | if (slave) { | |
1021 | chan->slave = true; | |
1022 | chan->name = kasprintf(GFP_KERNEL, "slave%d", i); | |
1023 | if (!chan->name) | |
1024 | return -ENOMEM; | |
1025 | } else { | |
1026 | chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); | |
1027 | if (!chan->name) | |
1028 | return -ENOMEM; | |
1029 | } | |
1030 | dev_dbg(dmadev->dev, | |
1031 | "initialize virtual channel \"%s\"\n", | |
1032 | chan->name); | |
1033 | ||
1034 | chan->vc.desc_free = s3c24xx_dma_desc_free; | |
1035 | vchan_init(&chan->vc, dmadev); | |
1036 | } | |
1037 | dev_info(dmadev->dev, "initialized %d virtual %s channels\n", | |
1038 | i, slave ? "slave" : "memcpy"); | |
1039 | return i; | |
1040 | } | |
1041 | ||
1042 | static void s3c24xx_dma_free_virtual_channels(struct dma_device *dmadev) | |
1043 | { | |
1044 | struct s3c24xx_dma_chan *chan = NULL; | |
1045 | struct s3c24xx_dma_chan *next; | |
1046 | ||
1047 | list_for_each_entry_safe(chan, | |
1048 | next, &dmadev->channels, vc.chan.device_node) | |
1049 | list_del(&chan->vc.chan.device_node); | |
1050 | } | |
1051 | ||
681a2fd2 HS |
1052 | /* s3c2410, s3c2440 and s3c2442 have a 0x40 stride without separate clocks */ |
1053 | static struct soc_data soc_s3c2410 = { | |
1054 | .stride = 0x40, | |
1055 | .has_reqsel = false, | |
1056 | .has_clocks = false, | |
1057 | }; | |
1058 | ||
ddeccb8d HS |
1059 | /* s3c2412 and s3c2413 have a 0x40 stride and dmareqsel mechanism */ |
1060 | static struct soc_data soc_s3c2412 = { | |
1061 | .stride = 0x40, | |
1062 | .has_reqsel = true, | |
1063 | .has_clocks = true, | |
1064 | }; | |
1065 | ||
1066 | /* s3c2443 and following have a 0x100 stride and dmareqsel mechanism */ | |
1067 | static struct soc_data soc_s3c2443 = { | |
1068 | .stride = 0x100, | |
1069 | .has_reqsel = true, | |
1070 | .has_clocks = true, | |
1071 | }; | |
1072 | ||
1073 | static struct platform_device_id s3c24xx_dma_driver_ids[] = { | |
1074 | { | |
681a2fd2 HS |
1075 | .name = "s3c2410-dma", |
1076 | .driver_data = (kernel_ulong_t)&soc_s3c2410, | |
1077 | }, { | |
ddeccb8d HS |
1078 | .name = "s3c2412-dma", |
1079 | .driver_data = (kernel_ulong_t)&soc_s3c2412, | |
1080 | }, { | |
1081 | .name = "s3c2443-dma", | |
1082 | .driver_data = (kernel_ulong_t)&soc_s3c2443, | |
1083 | }, | |
1084 | { }, | |
1085 | }; | |
1086 | ||
1087 | static struct soc_data *s3c24xx_dma_get_soc_data(struct platform_device *pdev) | |
1088 | { | |
1089 | return (struct soc_data *) | |
1090 | platform_get_device_id(pdev)->driver_data; | |
1091 | } | |
1092 | ||
1093 | static int s3c24xx_dma_probe(struct platform_device *pdev) | |
1094 | { | |
1095 | const struct s3c24xx_dma_platdata *pdata = dev_get_platdata(&pdev->dev); | |
1096 | struct s3c24xx_dma_engine *s3cdma; | |
1097 | struct soc_data *sdata; | |
1098 | struct resource *res; | |
1099 | int ret; | |
1100 | int i; | |
1101 | ||
1102 | if (!pdata) { | |
1103 | dev_err(&pdev->dev, "platform data missing\n"); | |
1104 | return -ENODEV; | |
1105 | } | |
1106 | ||
1107 | /* Basic sanity check */ | |
1108 | if (pdata->num_phy_channels > MAX_DMA_CHANNELS) { | |
1109 | dev_err(&pdev->dev, "to many dma channels %d, max %d\n", | |
1110 | pdata->num_phy_channels, MAX_DMA_CHANNELS); | |
1111 | return -EINVAL; | |
1112 | } | |
1113 | ||
1114 | sdata = s3c24xx_dma_get_soc_data(pdev); | |
1115 | if (!sdata) | |
1116 | return -EINVAL; | |
1117 | ||
1118 | s3cdma = devm_kzalloc(&pdev->dev, sizeof(*s3cdma), GFP_KERNEL); | |
1119 | if (!s3cdma) | |
1120 | return -ENOMEM; | |
1121 | ||
1122 | s3cdma->pdev = pdev; | |
1123 | s3cdma->pdata = pdata; | |
1124 | s3cdma->sdata = sdata; | |
1125 | ||
1126 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1127 | s3cdma->base = devm_ioremap_resource(&pdev->dev, res); | |
1128 | if (IS_ERR(s3cdma->base)) | |
1129 | return PTR_ERR(s3cdma->base); | |
1130 | ||
1131 | s3cdma->phy_chans = devm_kzalloc(&pdev->dev, | |
1132 | sizeof(struct s3c24xx_dma_phy) * | |
1133 | pdata->num_phy_channels, | |
1134 | GFP_KERNEL); | |
1135 | if (!s3cdma->phy_chans) | |
1136 | return -ENOMEM; | |
1137 | ||
1138 | /* aquire irqs and clocks for all physical channels */ | |
1139 | for (i = 0; i < pdata->num_phy_channels; i++) { | |
1140 | struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i]; | |
1141 | char clk_name[6]; | |
1142 | ||
1143 | phy->id = i; | |
1144 | phy->base = s3cdma->base + (i * sdata->stride); | |
1145 | phy->host = s3cdma; | |
1146 | ||
1147 | phy->irq = platform_get_irq(pdev, i); | |
1148 | if (phy->irq < 0) { | |
1149 | dev_err(&pdev->dev, "failed to get irq %d, err %d\n", | |
1150 | i, phy->irq); | |
1151 | continue; | |
1152 | } | |
1153 | ||
1154 | ret = devm_request_irq(&pdev->dev, phy->irq, s3c24xx_dma_irq, | |
1155 | 0, pdev->name, phy); | |
1156 | if (ret) { | |
1157 | dev_err(&pdev->dev, "Unable to request irq for channel %d, error %d\n", | |
1158 | i, ret); | |
1159 | continue; | |
1160 | } | |
1161 | ||
1162 | if (sdata->has_clocks) { | |
1163 | sprintf(clk_name, "dma.%d", i); | |
1164 | phy->clk = devm_clk_get(&pdev->dev, clk_name); | |
1165 | if (IS_ERR(phy->clk) && sdata->has_clocks) { | |
1166 | dev_err(&pdev->dev, "unable to aquire clock for channel %d, error %lu", | |
1167 | i, PTR_ERR(phy->clk)); | |
1168 | continue; | |
1169 | } | |
1170 | ||
1171 | ret = clk_prepare(phy->clk); | |
1172 | if (ret) { | |
1173 | dev_err(&pdev->dev, "clock for phy %d failed, error %d\n", | |
1174 | i, ret); | |
1175 | continue; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | spin_lock_init(&phy->lock); | |
1180 | phy->valid = true; | |
1181 | ||
1182 | dev_dbg(&pdev->dev, "physical channel %d is %s\n", | |
1183 | i, s3c24xx_dma_phy_busy(phy) ? "BUSY" : "FREE"); | |
1184 | } | |
1185 | ||
1186 | /* Initialize memcpy engine */ | |
1187 | dma_cap_set(DMA_MEMCPY, s3cdma->memcpy.cap_mask); | |
1188 | dma_cap_set(DMA_PRIVATE, s3cdma->memcpy.cap_mask); | |
1189 | s3cdma->memcpy.dev = &pdev->dev; | |
1190 | s3cdma->memcpy.device_alloc_chan_resources = | |
1191 | s3c24xx_dma_alloc_chan_resources; | |
1192 | s3cdma->memcpy.device_free_chan_resources = | |
1193 | s3c24xx_dma_free_chan_resources; | |
1194 | s3cdma->memcpy.device_prep_dma_memcpy = s3c24xx_dma_prep_memcpy; | |
1195 | s3cdma->memcpy.device_tx_status = s3c24xx_dma_tx_status; | |
1196 | s3cdma->memcpy.device_issue_pending = s3c24xx_dma_issue_pending; | |
1197 | s3cdma->memcpy.device_control = s3c24xx_dma_control; | |
1198 | ||
1199 | /* Initialize slave engine for SoC internal dedicated peripherals */ | |
1200 | dma_cap_set(DMA_SLAVE, s3cdma->slave.cap_mask); | |
1201 | dma_cap_set(DMA_PRIVATE, s3cdma->slave.cap_mask); | |
1202 | s3cdma->slave.dev = &pdev->dev; | |
1203 | s3cdma->slave.device_alloc_chan_resources = | |
1204 | s3c24xx_dma_alloc_chan_resources; | |
1205 | s3cdma->slave.device_free_chan_resources = | |
1206 | s3c24xx_dma_free_chan_resources; | |
1207 | s3cdma->slave.device_tx_status = s3c24xx_dma_tx_status; | |
1208 | s3cdma->slave.device_issue_pending = s3c24xx_dma_issue_pending; | |
1209 | s3cdma->slave.device_prep_slave_sg = s3c24xx_dma_prep_slave_sg; | |
1210 | s3cdma->slave.device_control = s3c24xx_dma_control; | |
1211 | ||
1212 | /* Register as many memcpy channels as there are physical channels */ | |
1213 | ret = s3c24xx_dma_init_virtual_channels(s3cdma, &s3cdma->memcpy, | |
1214 | pdata->num_phy_channels, false); | |
1215 | if (ret <= 0) { | |
1216 | dev_warn(&pdev->dev, | |
1217 | "%s failed to enumerate memcpy channels - %d\n", | |
1218 | __func__, ret); | |
1219 | goto err_memcpy; | |
1220 | } | |
1221 | ||
1222 | /* Register slave channels */ | |
1223 | ret = s3c24xx_dma_init_virtual_channels(s3cdma, &s3cdma->slave, | |
1224 | pdata->num_channels, true); | |
1225 | if (ret <= 0) { | |
1226 | dev_warn(&pdev->dev, | |
1227 | "%s failed to enumerate slave channels - %d\n", | |
1228 | __func__, ret); | |
1229 | goto err_slave; | |
1230 | } | |
1231 | ||
1232 | ret = dma_async_device_register(&s3cdma->memcpy); | |
1233 | if (ret) { | |
1234 | dev_warn(&pdev->dev, | |
1235 | "%s failed to register memcpy as an async device - %d\n", | |
1236 | __func__, ret); | |
1237 | goto err_memcpy_reg; | |
1238 | } | |
1239 | ||
1240 | ret = dma_async_device_register(&s3cdma->slave); | |
1241 | if (ret) { | |
1242 | dev_warn(&pdev->dev, | |
1243 | "%s failed to register slave as an async device - %d\n", | |
1244 | __func__, ret); | |
1245 | goto err_slave_reg; | |
1246 | } | |
1247 | ||
1248 | platform_set_drvdata(pdev, s3cdma); | |
1249 | dev_info(&pdev->dev, "Loaded dma driver with %d physical channels\n", | |
1250 | pdata->num_phy_channels); | |
1251 | ||
1252 | return 0; | |
1253 | ||
1254 | err_slave_reg: | |
1255 | dma_async_device_unregister(&s3cdma->memcpy); | |
1256 | err_memcpy_reg: | |
1257 | s3c24xx_dma_free_virtual_channels(&s3cdma->slave); | |
1258 | err_slave: | |
1259 | s3c24xx_dma_free_virtual_channels(&s3cdma->memcpy); | |
1260 | err_memcpy: | |
1261 | if (sdata->has_clocks) | |
1262 | for (i = 0; i < pdata->num_phy_channels; i++) { | |
1263 | struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i]; | |
1264 | if (phy->valid) | |
1265 | clk_unprepare(phy->clk); | |
1266 | } | |
1267 | ||
1268 | return ret; | |
1269 | } | |
1270 | ||
1271 | static int s3c24xx_dma_remove(struct platform_device *pdev) | |
1272 | { | |
1273 | const struct s3c24xx_dma_platdata *pdata = dev_get_platdata(&pdev->dev); | |
1274 | struct s3c24xx_dma_engine *s3cdma = platform_get_drvdata(pdev); | |
1275 | struct soc_data *sdata = s3c24xx_dma_get_soc_data(pdev); | |
1276 | int i; | |
1277 | ||
1278 | dma_async_device_unregister(&s3cdma->slave); | |
1279 | dma_async_device_unregister(&s3cdma->memcpy); | |
1280 | ||
1281 | s3c24xx_dma_free_virtual_channels(&s3cdma->slave); | |
1282 | s3c24xx_dma_free_virtual_channels(&s3cdma->memcpy); | |
1283 | ||
1284 | if (sdata->has_clocks) | |
1285 | for (i = 0; i < pdata->num_phy_channels; i++) { | |
1286 | struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i]; | |
1287 | if (phy->valid) | |
1288 | clk_unprepare(phy->clk); | |
1289 | } | |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | static struct platform_driver s3c24xx_dma_driver = { | |
1295 | .driver = { | |
1296 | .name = "s3c24xx-dma", | |
1297 | .owner = THIS_MODULE, | |
1298 | }, | |
1299 | .id_table = s3c24xx_dma_driver_ids, | |
1300 | .probe = s3c24xx_dma_probe, | |
1301 | .remove = s3c24xx_dma_remove, | |
1302 | }; | |
1303 | ||
1304 | module_platform_driver(s3c24xx_dma_driver); | |
1305 | ||
1306 | bool s3c24xx_dma_filter(struct dma_chan *chan, void *param) | |
1307 | { | |
1308 | struct s3c24xx_dma_chan *s3cchan; | |
1309 | ||
1310 | if (chan->device->dev->driver != &s3c24xx_dma_driver.driver) | |
1311 | return false; | |
1312 | ||
1313 | s3cchan = to_s3c24xx_dma_chan(chan); | |
1314 | ||
1315 | return s3cchan->id == (int)param; | |
1316 | } | |
1317 | EXPORT_SYMBOL(s3c24xx_dma_filter); | |
1318 | ||
1319 | MODULE_DESCRIPTION("S3C24XX DMA Driver"); | |
1320 | MODULE_AUTHOR("Heiko Stuebner"); | |
1321 | MODULE_LICENSE("GPL v2"); |