Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a57e16cf RJ |
2 | /* |
3 | * Copyright 2015 Robert Jarzmik <robert.jarzmik@free.fr> | |
a57e16cf RJ |
4 | */ |
5 | ||
6 | #include <linux/err.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/interrupt.h> | |
11 | #include <linux/dma-mapping.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/dmaengine.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/platform_data/mmp_dma.h> | |
17 | #include <linux/dmapool.h> | |
18 | #include <linux/of_device.h> | |
19 | #include <linux/of_dma.h> | |
20 | #include <linux/of.h> | |
7d604663 | 21 | #include <linux/wait.h> |
a57e16cf RJ |
22 | #include <linux/dma/pxa-dma.h> |
23 | ||
24 | #include "dmaengine.h" | |
25 | #include "virt-dma.h" | |
26 | ||
27 | #define DCSR(n) (0x0000 + ((n) << 2)) | |
28 | #define DALGN(n) 0x00a0 | |
29 | #define DINT 0x00f0 | |
30 | #define DDADR(n) (0x0200 + ((n) << 4)) | |
31 | #define DSADR(n) (0x0204 + ((n) << 4)) | |
32 | #define DTADR(n) (0x0208 + ((n) << 4)) | |
33 | #define DCMD(n) (0x020c + ((n) << 4)) | |
34 | ||
35 | #define PXA_DCSR_RUN BIT(31) /* Run Bit (read / write) */ | |
36 | #define PXA_DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */ | |
37 | #define PXA_DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (R/W) */ | |
38 | #define PXA_DCSR_REQPEND BIT(8) /* Request Pending (read-only) */ | |
39 | #define PXA_DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */ | |
40 | #define PXA_DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */ | |
41 | #define PXA_DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */ | |
42 | #define PXA_DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */ | |
43 | ||
44 | #define PXA_DCSR_EORIRQEN BIT(28) /* End of Receive IRQ Enable (R/W) */ | |
45 | #define PXA_DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */ | |
46 | #define PXA_DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */ | |
47 | #define PXA_DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */ | |
48 | #define PXA_DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */ | |
49 | #define PXA_DCSR_CMPST BIT(10) /* The Descriptor Compare Status */ | |
50 | #define PXA_DCSR_EORINTR BIT(9) /* The end of Receive */ | |
51 | ||
52 | #define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */ | |
53 | #define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */ | |
54 | ||
55 | #define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */ | |
56 | #define DDADR_STOP BIT(0) /* Stop (read / write) */ | |
57 | ||
58 | #define PXA_DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */ | |
59 | #define PXA_DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */ | |
60 | #define PXA_DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */ | |
61 | #define PXA_DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */ | |
62 | #define PXA_DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */ | |
63 | #define PXA_DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */ | |
64 | #define PXA_DCMD_ENDIAN BIT(18) /* Device Endian-ness. */ | |
65 | #define PXA_DCMD_BURST8 (1 << 16) /* 8 byte burst */ | |
66 | #define PXA_DCMD_BURST16 (2 << 16) /* 16 byte burst */ | |
67 | #define PXA_DCMD_BURST32 (3 << 16) /* 32 byte burst */ | |
68 | #define PXA_DCMD_WIDTH1 (1 << 14) /* 1 byte width */ | |
69 | #define PXA_DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */ | |
70 | #define PXA_DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */ | |
71 | #define PXA_DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */ | |
72 | ||
73 | #define PDMA_ALIGNMENT 3 | |
74 | #define PDMA_MAX_DESC_BYTES (PXA_DCMD_LENGTH & ~((1 << PDMA_ALIGNMENT) - 1)) | |
75 | ||
76 | struct pxad_desc_hw { | |
77 | u32 ddadr; /* Points to the next descriptor + flags */ | |
78 | u32 dsadr; /* DSADR value for the current transfer */ | |
79 | u32 dtadr; /* DTADR value for the current transfer */ | |
80 | u32 dcmd; /* DCMD value for the current transfer */ | |
81 | } __aligned(16); | |
82 | ||
83 | struct pxad_desc_sw { | |
84 | struct virt_dma_desc vd; /* Virtual descriptor */ | |
85 | int nb_desc; /* Number of hw. descriptors */ | |
86 | size_t len; /* Number of bytes xfered */ | |
87 | dma_addr_t first; /* First descriptor's addr */ | |
88 | ||
89 | /* At least one descriptor has an src/dst address not multiple of 8 */ | |
90 | bool misaligned; | |
91 | bool cyclic; | |
92 | struct dma_pool *desc_pool; /* Channel's used allocator */ | |
93 | ||
94 | struct pxad_desc_hw *hw_desc[]; /* DMA coherent descriptors */ | |
95 | }; | |
96 | ||
97 | struct pxad_phy { | |
98 | int idx; | |
99 | void __iomem *base; | |
100 | struct pxad_chan *vchan; | |
101 | }; | |
102 | ||
103 | struct pxad_chan { | |
104 | struct virt_dma_chan vc; /* Virtual channel */ | |
105 | u32 drcmr; /* Requestor of the channel */ | |
106 | enum pxad_chan_prio prio; /* Required priority of phy */ | |
107 | /* | |
108 | * At least one desc_sw in submitted or issued transfers on this channel | |
109 | * has one address such as: addr % 8 != 0. This implies the DALGN | |
110 | * setting on the phy. | |
111 | */ | |
112 | bool misaligned; | |
113 | struct dma_slave_config cfg; /* Runtime config */ | |
114 | ||
115 | /* protected by vc->lock */ | |
116 | struct pxad_phy *phy; | |
117 | struct dma_pool *desc_pool; /* Descriptors pool */ | |
e093bf60 | 118 | dma_cookie_t bus_error; |
7d604663 RJ |
119 | |
120 | wait_queue_head_t wq_state; | |
a57e16cf RJ |
121 | }; |
122 | ||
123 | struct pxad_device { | |
124 | struct dma_device slave; | |
125 | int nr_chans; | |
6bab1c6a | 126 | int nr_requestors; |
a57e16cf RJ |
127 | void __iomem *base; |
128 | struct pxad_phy *phys; | |
129 | spinlock_t phy_lock; /* Phy association */ | |
c01d1b51 RJ |
130 | #ifdef CONFIG_DEBUG_FS |
131 | struct dentry *dbgfs_root; | |
c01d1b51 RJ |
132 | struct dentry **dbgfs_chan; |
133 | #endif | |
a57e16cf RJ |
134 | }; |
135 | ||
136 | #define tx_to_pxad_desc(tx) \ | |
137 | container_of(tx, struct pxad_desc_sw, async_tx) | |
138 | #define to_pxad_chan(dchan) \ | |
139 | container_of(dchan, struct pxad_chan, vc.chan) | |
140 | #define to_pxad_dev(dmadev) \ | |
141 | container_of(dmadev, struct pxad_device, slave) | |
142 | #define to_pxad_sw_desc(_vd) \ | |
143 | container_of((_vd), struct pxad_desc_sw, vd) | |
144 | ||
145 | #define _phy_readl_relaxed(phy, _reg) \ | |
146 | readl_relaxed((phy)->base + _reg((phy)->idx)) | |
147 | #define phy_readl_relaxed(phy, _reg) \ | |
148 | ({ \ | |
149 | u32 _v; \ | |
150 | _v = readl_relaxed((phy)->base + _reg((phy)->idx)); \ | |
151 | dev_vdbg(&phy->vchan->vc.chan.dev->device, \ | |
152 | "%s(): readl(%s): 0x%08x\n", __func__, #_reg, \ | |
153 | _v); \ | |
154 | _v; \ | |
155 | }) | |
156 | #define phy_writel(phy, val, _reg) \ | |
157 | do { \ | |
158 | writel((val), (phy)->base + _reg((phy)->idx)); \ | |
159 | dev_vdbg(&phy->vchan->vc.chan.dev->device, \ | |
160 | "%s(): writel(0x%08x, %s)\n", \ | |
161 | __func__, (u32)(val), #_reg); \ | |
162 | } while (0) | |
163 | #define phy_writel_relaxed(phy, val, _reg) \ | |
164 | do { \ | |
165 | writel_relaxed((val), (phy)->base + _reg((phy)->idx)); \ | |
166 | dev_vdbg(&phy->vchan->vc.chan.dev->device, \ | |
167 | "%s(): writel_relaxed(0x%08x, %s)\n", \ | |
168 | __func__, (u32)(val), #_reg); \ | |
169 | } while (0) | |
170 | ||
171 | static unsigned int pxad_drcmr(unsigned int line) | |
172 | { | |
173 | if (line < 64) | |
174 | return 0x100 + line * 4; | |
175 | return 0x1000 + line * 4; | |
176 | } | |
c01d1b51 | 177 | |
c2a70a31 | 178 | static bool pxad_filter_fn(struct dma_chan *chan, void *param); |
420c0117 | 179 | |
c01d1b51 RJ |
180 | /* |
181 | * Debug fs | |
182 | */ | |
183 | #ifdef CONFIG_DEBUG_FS | |
184 | #include <linux/debugfs.h> | |
185 | #include <linux/uaccess.h> | |
186 | #include <linux/seq_file.h> | |
187 | ||
e00f50a7 | 188 | static int requester_chan_show(struct seq_file *s, void *p) |
c01d1b51 | 189 | { |
c01d1b51 RJ |
190 | struct pxad_phy *phy = s->private; |
191 | int i; | |
192 | u32 drcmr; | |
193 | ||
4a736d15 | 194 | seq_printf(s, "DMA channel %d requester :\n", phy->idx); |
c01d1b51 RJ |
195 | for (i = 0; i < 70; i++) { |
196 | drcmr = readl_relaxed(phy->base + pxad_drcmr(i)); | |
197 | if ((drcmr & DRCMR_CHLNUM) == phy->idx) | |
4a736d15 RJ |
198 | seq_printf(s, "\tRequester %d (MAPVLD=%d)\n", i, |
199 | !!(drcmr & DRCMR_MAPVLD)); | |
c01d1b51 | 200 | } |
4a736d15 | 201 | return 0; |
c01d1b51 RJ |
202 | } |
203 | ||
204 | static inline int dbg_burst_from_dcmd(u32 dcmd) | |
205 | { | |
206 | int burst = (dcmd >> 16) & 0x3; | |
207 | ||
208 | return burst ? 4 << burst : 0; | |
209 | } | |
210 | ||
211 | static int is_phys_valid(unsigned long addr) | |
212 | { | |
213 | return pfn_valid(__phys_to_pfn(addr)); | |
214 | } | |
215 | ||
216 | #define PXA_DCSR_STR(flag) (dcsr & PXA_DCSR_##flag ? #flag" " : "") | |
217 | #define PXA_DCMD_STR(flag) (dcmd & PXA_DCMD_##flag ? #flag" " : "") | |
218 | ||
e00f50a7 | 219 | static int descriptors_show(struct seq_file *s, void *p) |
c01d1b51 RJ |
220 | { |
221 | struct pxad_phy *phy = s->private; | |
222 | int i, max_show = 20, burst, width; | |
223 | u32 dcmd; | |
224 | unsigned long phys_desc, ddadr; | |
225 | struct pxad_desc_hw *desc; | |
226 | ||
227 | phys_desc = ddadr = _phy_readl_relaxed(phy, DDADR); | |
228 | ||
229 | seq_printf(s, "DMA channel %d descriptors :\n", phy->idx); | |
230 | seq_printf(s, "[%03d] First descriptor unknown\n", 0); | |
231 | for (i = 1; i < max_show && is_phys_valid(phys_desc); i++) { | |
232 | desc = phys_to_virt(phys_desc); | |
233 | dcmd = desc->dcmd; | |
234 | burst = dbg_burst_from_dcmd(dcmd); | |
235 | width = (1 << ((dcmd >> 14) & 0x3)) >> 1; | |
236 | ||
237 | seq_printf(s, "[%03d] Desc at %08lx(virt %p)\n", | |
238 | i, phys_desc, desc); | |
239 | seq_printf(s, "\tDDADR = %08x\n", desc->ddadr); | |
240 | seq_printf(s, "\tDSADR = %08x\n", desc->dsadr); | |
241 | seq_printf(s, "\tDTADR = %08x\n", desc->dtadr); | |
242 | seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n", | |
243 | dcmd, | |
244 | PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR), | |
245 | PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG), | |
246 | PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN), | |
247 | PXA_DCMD_STR(ENDIAN), burst, width, | |
248 | dcmd & PXA_DCMD_LENGTH); | |
249 | phys_desc = desc->ddadr; | |
250 | } | |
251 | if (i == max_show) | |
252 | seq_printf(s, "[%03d] Desc at %08lx ... max display reached\n", | |
253 | i, phys_desc); | |
254 | else | |
255 | seq_printf(s, "[%03d] Desc at %08lx is %s\n", | |
256 | i, phys_desc, phys_desc == DDADR_STOP ? | |
257 | "DDADR_STOP" : "invalid"); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
e00f50a7 | 262 | static int chan_state_show(struct seq_file *s, void *p) |
c01d1b51 RJ |
263 | { |
264 | struct pxad_phy *phy = s->private; | |
265 | u32 dcsr, dcmd; | |
266 | int burst, width; | |
267 | static const char * const str_prio[] = { | |
268 | "high", "normal", "low", "invalid" | |
269 | }; | |
270 | ||
271 | dcsr = _phy_readl_relaxed(phy, DCSR); | |
272 | dcmd = _phy_readl_relaxed(phy, DCMD); | |
273 | burst = dbg_burst_from_dcmd(dcmd); | |
274 | width = (1 << ((dcmd >> 14) & 0x3)) >> 1; | |
275 | ||
276 | seq_printf(s, "DMA channel %d\n", phy->idx); | |
277 | seq_printf(s, "\tPriority : %s\n", | |
278 | str_prio[(phy->idx & 0xf) / 4]); | |
279 | seq_printf(s, "\tUnaligned transfer bit: %s\n", | |
280 | _phy_readl_relaxed(phy, DALGN) & BIT(phy->idx) ? | |
281 | "yes" : "no"); | |
282 | seq_printf(s, "\tDCSR = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n", | |
283 | dcsr, PXA_DCSR_STR(RUN), PXA_DCSR_STR(NODESC), | |
284 | PXA_DCSR_STR(STOPIRQEN), PXA_DCSR_STR(EORIRQEN), | |
285 | PXA_DCSR_STR(EORJMPEN), PXA_DCSR_STR(EORSTOPEN), | |
286 | PXA_DCSR_STR(SETCMPST), PXA_DCSR_STR(CLRCMPST), | |
287 | PXA_DCSR_STR(CMPST), PXA_DCSR_STR(EORINTR), | |
288 | PXA_DCSR_STR(REQPEND), PXA_DCSR_STR(STOPSTATE), | |
289 | PXA_DCSR_STR(ENDINTR), PXA_DCSR_STR(STARTINTR), | |
290 | PXA_DCSR_STR(BUSERR)); | |
291 | ||
292 | seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n", | |
293 | dcmd, | |
294 | PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR), | |
295 | PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG), | |
296 | PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN), | |
297 | PXA_DCMD_STR(ENDIAN), burst, width, dcmd & PXA_DCMD_LENGTH); | |
298 | seq_printf(s, "\tDSADR = %08x\n", _phy_readl_relaxed(phy, DSADR)); | |
299 | seq_printf(s, "\tDTADR = %08x\n", _phy_readl_relaxed(phy, DTADR)); | |
300 | seq_printf(s, "\tDDADR = %08x\n", _phy_readl_relaxed(phy, DDADR)); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
e00f50a7 | 305 | static int state_show(struct seq_file *s, void *p) |
c01d1b51 RJ |
306 | { |
307 | struct pxad_device *pdev = s->private; | |
308 | ||
309 | /* basic device status */ | |
310 | seq_puts(s, "DMA engine status\n"); | |
311 | seq_printf(s, "\tChannel number: %d\n", pdev->nr_chans); | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
e00f50a7 YL |
316 | DEFINE_SHOW_ATTRIBUTE(state); |
317 | DEFINE_SHOW_ATTRIBUTE(chan_state); | |
318 | DEFINE_SHOW_ATTRIBUTE(descriptors); | |
319 | DEFINE_SHOW_ATTRIBUTE(requester_chan); | |
c01d1b51 RJ |
320 | |
321 | static struct dentry *pxad_dbg_alloc_chan(struct pxad_device *pdev, | |
322 | int ch, struct dentry *chandir) | |
323 | { | |
324 | char chan_name[11]; | |
8148a878 | 325 | struct dentry *chan; |
c01d1b51 RJ |
326 | void *dt; |
327 | ||
328 | scnprintf(chan_name, sizeof(chan_name), "%d", ch); | |
329 | chan = debugfs_create_dir(chan_name, chandir); | |
330 | dt = (void *)&pdev->phys[ch]; | |
331 | ||
8148a878 GKH |
332 | debugfs_create_file("state", 0400, chan, dt, &chan_state_fops); |
333 | debugfs_create_file("descriptors", 0400, chan, dt, &descriptors_fops); | |
334 | debugfs_create_file("requesters", 0400, chan, dt, &requester_chan_fops); | |
c01d1b51 RJ |
335 | |
336 | return chan; | |
c01d1b51 RJ |
337 | } |
338 | ||
339 | static void pxad_init_debugfs(struct pxad_device *pdev) | |
340 | { | |
341 | int i; | |
342 | struct dentry *chandir; | |
343 | ||
c01d1b51 | 344 | pdev->dbgfs_chan = |
8148a878 | 345 | kmalloc_array(pdev->nr_chans, sizeof(struct dentry *), |
c01d1b51 RJ |
346 | GFP_KERNEL); |
347 | if (!pdev->dbgfs_chan) | |
8148a878 GKH |
348 | return; |
349 | ||
350 | pdev->dbgfs_root = debugfs_create_dir(dev_name(pdev->slave.dev), NULL); | |
351 | ||
352 | debugfs_create_file("state", 0400, pdev->dbgfs_root, pdev, &state_fops); | |
c01d1b51 RJ |
353 | |
354 | chandir = debugfs_create_dir("channels", pdev->dbgfs_root); | |
c01d1b51 | 355 | |
8148a878 | 356 | for (i = 0; i < pdev->nr_chans; i++) |
c01d1b51 | 357 | pdev->dbgfs_chan[i] = pxad_dbg_alloc_chan(pdev, i, chandir); |
c01d1b51 RJ |
358 | } |
359 | ||
360 | static void pxad_cleanup_debugfs(struct pxad_device *pdev) | |
361 | { | |
362 | debugfs_remove_recursive(pdev->dbgfs_root); | |
363 | } | |
364 | #else | |
365 | static inline void pxad_init_debugfs(struct pxad_device *pdev) {} | |
366 | static inline void pxad_cleanup_debugfs(struct pxad_device *pdev) {} | |
367 | #endif | |
368 | ||
a57e16cf RJ |
369 | static struct pxad_phy *lookup_phy(struct pxad_chan *pchan) |
370 | { | |
371 | int prio, i; | |
372 | struct pxad_device *pdev = to_pxad_dev(pchan->vc.chan.device); | |
373 | struct pxad_phy *phy, *found = NULL; | |
374 | unsigned long flags; | |
375 | ||
376 | /* | |
377 | * dma channel priorities | |
378 | * ch 0 - 3, 16 - 19 <--> (0) | |
379 | * ch 4 - 7, 20 - 23 <--> (1) | |
380 | * ch 8 - 11, 24 - 27 <--> (2) | |
381 | * ch 12 - 15, 28 - 31 <--> (3) | |
382 | */ | |
383 | ||
384 | spin_lock_irqsave(&pdev->phy_lock, flags); | |
385 | for (prio = pchan->prio; prio >= PXAD_PRIO_HIGHEST; prio--) { | |
386 | for (i = 0; i < pdev->nr_chans; i++) { | |
387 | if (prio != (i & 0xf) >> 2) | |
388 | continue; | |
389 | phy = &pdev->phys[i]; | |
390 | if (!phy->vchan) { | |
391 | phy->vchan = pchan; | |
392 | found = phy; | |
393 | goto out_unlock; | |
394 | } | |
395 | } | |
396 | } | |
397 | ||
398 | out_unlock: | |
399 | spin_unlock_irqrestore(&pdev->phy_lock, flags); | |
400 | dev_dbg(&pchan->vc.chan.dev->device, | |
401 | "%s(): phy=%p(%d)\n", __func__, found, | |
402 | found ? found->idx : -1); | |
403 | ||
404 | return found; | |
405 | } | |
406 | ||
407 | static void pxad_free_phy(struct pxad_chan *chan) | |
408 | { | |
409 | struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); | |
410 | unsigned long flags; | |
411 | u32 reg; | |
412 | ||
413 | dev_dbg(&chan->vc.chan.dev->device, | |
414 | "%s(): freeing\n", __func__); | |
415 | if (!chan->phy) | |
416 | return; | |
417 | ||
418 | /* clear the channel mapping in DRCMR */ | |
6bab1c6a | 419 | if (chan->drcmr <= pdev->nr_requestors) { |
e87ffbdf RJ |
420 | reg = pxad_drcmr(chan->drcmr); |
421 | writel_relaxed(0, chan->phy->base + reg); | |
422 | } | |
a57e16cf RJ |
423 | |
424 | spin_lock_irqsave(&pdev->phy_lock, flags); | |
425 | chan->phy->vchan = NULL; | |
426 | chan->phy = NULL; | |
427 | spin_unlock_irqrestore(&pdev->phy_lock, flags); | |
428 | } | |
429 | ||
430 | static bool is_chan_running(struct pxad_chan *chan) | |
431 | { | |
432 | u32 dcsr; | |
433 | struct pxad_phy *phy = chan->phy; | |
434 | ||
435 | if (!phy) | |
436 | return false; | |
437 | dcsr = phy_readl_relaxed(phy, DCSR); | |
438 | return dcsr & PXA_DCSR_RUN; | |
439 | } | |
440 | ||
441 | static bool is_running_chan_misaligned(struct pxad_chan *chan) | |
442 | { | |
443 | u32 dalgn; | |
444 | ||
445 | BUG_ON(!chan->phy); | |
446 | dalgn = phy_readl_relaxed(chan->phy, DALGN); | |
447 | return dalgn & (BIT(chan->phy->idx)); | |
448 | } | |
449 | ||
450 | static void phy_enable(struct pxad_phy *phy, bool misaligned) | |
451 | { | |
6bab1c6a | 452 | struct pxad_device *pdev; |
a57e16cf RJ |
453 | u32 reg, dalgn; |
454 | ||
455 | if (!phy->vchan) | |
456 | return; | |
457 | ||
458 | dev_dbg(&phy->vchan->vc.chan.dev->device, | |
459 | "%s(); phy=%p(%d) misaligned=%d\n", __func__, | |
460 | phy, phy->idx, misaligned); | |
461 | ||
6bab1c6a RJ |
462 | pdev = to_pxad_dev(phy->vchan->vc.chan.device); |
463 | if (phy->vchan->drcmr <= pdev->nr_requestors) { | |
e87ffbdf RJ |
464 | reg = pxad_drcmr(phy->vchan->drcmr); |
465 | writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg); | |
466 | } | |
a57e16cf RJ |
467 | |
468 | dalgn = phy_readl_relaxed(phy, DALGN); | |
469 | if (misaligned) | |
470 | dalgn |= BIT(phy->idx); | |
471 | else | |
472 | dalgn &= ~BIT(phy->idx); | |
473 | phy_writel_relaxed(phy, dalgn, DALGN); | |
474 | ||
475 | phy_writel(phy, PXA_DCSR_STOPIRQEN | PXA_DCSR_ENDINTR | | |
476 | PXA_DCSR_BUSERR | PXA_DCSR_RUN, DCSR); | |
477 | } | |
478 | ||
479 | static void phy_disable(struct pxad_phy *phy) | |
480 | { | |
481 | u32 dcsr; | |
482 | ||
483 | if (!phy) | |
484 | return; | |
485 | ||
486 | dcsr = phy_readl_relaxed(phy, DCSR); | |
487 | dev_dbg(&phy->vchan->vc.chan.dev->device, | |
488 | "%s(): phy=%p(%d)\n", __func__, phy, phy->idx); | |
489 | phy_writel(phy, dcsr & ~PXA_DCSR_RUN & ~PXA_DCSR_STOPIRQEN, DCSR); | |
490 | } | |
491 | ||
492 | static void pxad_launch_chan(struct pxad_chan *chan, | |
493 | struct pxad_desc_sw *desc) | |
494 | { | |
495 | dev_dbg(&chan->vc.chan.dev->device, | |
496 | "%s(): desc=%p\n", __func__, desc); | |
497 | if (!chan->phy) { | |
498 | chan->phy = lookup_phy(chan); | |
499 | if (!chan->phy) { | |
500 | dev_dbg(&chan->vc.chan.dev->device, | |
501 | "%s(): no free dma channel\n", __func__); | |
502 | return; | |
503 | } | |
504 | } | |
e093bf60 | 505 | chan->bus_error = 0; |
a57e16cf RJ |
506 | |
507 | /* | |
508 | * Program the descriptor's address into the DMA controller, | |
509 | * then start the DMA transaction | |
510 | */ | |
511 | phy_writel(chan->phy, desc->first, DDADR); | |
512 | phy_enable(chan->phy, chan->misaligned); | |
7d604663 | 513 | wake_up(&chan->wq_state); |
a57e16cf RJ |
514 | } |
515 | ||
516 | static void set_updater_desc(struct pxad_desc_sw *sw_desc, | |
517 | unsigned long flags) | |
518 | { | |
519 | struct pxad_desc_hw *updater = | |
520 | sw_desc->hw_desc[sw_desc->nb_desc - 1]; | |
521 | dma_addr_t dma = sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr; | |
522 | ||
523 | updater->ddadr = DDADR_STOP; | |
524 | updater->dsadr = dma; | |
525 | updater->dtadr = dma + 8; | |
526 | updater->dcmd = PXA_DCMD_WIDTH4 | PXA_DCMD_BURST32 | | |
527 | (PXA_DCMD_LENGTH & sizeof(u32)); | |
528 | if (flags & DMA_PREP_INTERRUPT) | |
529 | updater->dcmd |= PXA_DCMD_ENDIRQEN; | |
f1692127 RJ |
530 | if (sw_desc->cyclic) |
531 | sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr = sw_desc->first; | |
a57e16cf RJ |
532 | } |
533 | ||
534 | static bool is_desc_completed(struct virt_dma_desc *vd) | |
535 | { | |
536 | struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd); | |
537 | struct pxad_desc_hw *updater = | |
538 | sw_desc->hw_desc[sw_desc->nb_desc - 1]; | |
539 | ||
540 | return updater->dtadr != (updater->dsadr + 8); | |
541 | } | |
542 | ||
543 | static void pxad_desc_chain(struct virt_dma_desc *vd1, | |
544 | struct virt_dma_desc *vd2) | |
545 | { | |
546 | struct pxad_desc_sw *desc1 = to_pxad_sw_desc(vd1); | |
547 | struct pxad_desc_sw *desc2 = to_pxad_sw_desc(vd2); | |
548 | dma_addr_t dma_to_chain; | |
549 | ||
550 | dma_to_chain = desc2->first; | |
551 | desc1->hw_desc[desc1->nb_desc - 1]->ddadr = dma_to_chain; | |
552 | } | |
553 | ||
554 | static bool pxad_try_hotchain(struct virt_dma_chan *vc, | |
555 | struct virt_dma_desc *vd) | |
556 | { | |
557 | struct virt_dma_desc *vd_last_issued = NULL; | |
558 | struct pxad_chan *chan = to_pxad_chan(&vc->chan); | |
559 | ||
560 | /* | |
561 | * Attempt to hot chain the tx if the phy is still running. This is | |
562 | * considered successful only if either the channel is still running | |
563 | * after the chaining, or if the chained transfer is completed after | |
564 | * having been hot chained. | |
565 | * A change of alignment is not allowed, and forbids hotchaining. | |
566 | */ | |
567 | if (is_chan_running(chan)) { | |
568 | BUG_ON(list_empty(&vc->desc_issued)); | |
569 | ||
570 | if (!is_running_chan_misaligned(chan) && | |
571 | to_pxad_sw_desc(vd)->misaligned) | |
572 | return false; | |
573 | ||
574 | vd_last_issued = list_entry(vc->desc_issued.prev, | |
575 | struct virt_dma_desc, node); | |
576 | pxad_desc_chain(vd_last_issued, vd); | |
76507fdf | 577 | if (is_chan_running(chan) || is_desc_completed(vd)) |
a57e16cf RJ |
578 | return true; |
579 | } | |
580 | ||
581 | return false; | |
582 | } | |
583 | ||
584 | static unsigned int clear_chan_irq(struct pxad_phy *phy) | |
585 | { | |
586 | u32 dcsr; | |
587 | u32 dint = readl(phy->base + DINT); | |
588 | ||
589 | if (!(dint & BIT(phy->idx))) | |
590 | return PXA_DCSR_RUN; | |
591 | ||
592 | /* clear irq */ | |
593 | dcsr = phy_readl_relaxed(phy, DCSR); | |
594 | phy_writel(phy, dcsr, DCSR); | |
595 | if ((dcsr & PXA_DCSR_BUSERR) && (phy->vchan)) | |
596 | dev_warn(&phy->vchan->vc.chan.dev->device, | |
597 | "%s(chan=%p): PXA_DCSR_BUSERR\n", | |
598 | __func__, &phy->vchan); | |
599 | ||
600 | return dcsr & ~PXA_DCSR_RUN; | |
601 | } | |
602 | ||
603 | static irqreturn_t pxad_chan_handler(int irq, void *dev_id) | |
604 | { | |
605 | struct pxad_phy *phy = dev_id; | |
606 | struct pxad_chan *chan = phy->vchan; | |
607 | struct virt_dma_desc *vd, *tmp; | |
608 | unsigned int dcsr; | |
06777c4e | 609 | bool vd_completed; |
e093bf60 | 610 | dma_cookie_t last_started = 0; |
a57e16cf RJ |
611 | |
612 | BUG_ON(!chan); | |
613 | ||
614 | dcsr = clear_chan_irq(phy); | |
615 | if (dcsr & PXA_DCSR_RUN) | |
616 | return IRQ_NONE; | |
617 | ||
0e15ca5f | 618 | spin_lock(&chan->vc.lock); |
a57e16cf | 619 | list_for_each_entry_safe(vd, tmp, &chan->vc.desc_issued, node) { |
06777c4e | 620 | vd_completed = is_desc_completed(vd); |
a57e16cf | 621 | dev_dbg(&chan->vc.chan.dev->device, |
06777c4e RJ |
622 | "%s(): checking txd %p[%x]: completed=%d dcsr=0x%x\n", |
623 | __func__, vd, vd->tx.cookie, vd_completed, | |
624 | dcsr); | |
e093bf60 | 625 | last_started = vd->tx.cookie; |
f1692127 RJ |
626 | if (to_pxad_sw_desc(vd)->cyclic) { |
627 | vchan_cyclic_callback(vd); | |
628 | break; | |
629 | } | |
06777c4e | 630 | if (vd_completed) { |
a57e16cf RJ |
631 | list_del(&vd->node); |
632 | vchan_cookie_complete(vd); | |
633 | } else { | |
634 | break; | |
635 | } | |
636 | } | |
637 | ||
e093bf60 RJ |
638 | if (dcsr & PXA_DCSR_BUSERR) { |
639 | chan->bus_error = last_started; | |
640 | phy_disable(phy); | |
641 | } | |
642 | ||
643 | if (!chan->bus_error && dcsr & PXA_DCSR_STOPSTATE) { | |
a57e16cf RJ |
644 | dev_dbg(&chan->vc.chan.dev->device, |
645 | "%s(): channel stopped, submitted_empty=%d issued_empty=%d", | |
646 | __func__, | |
647 | list_empty(&chan->vc.desc_submitted), | |
648 | list_empty(&chan->vc.desc_issued)); | |
649 | phy_writel_relaxed(phy, dcsr & ~PXA_DCSR_STOPIRQEN, DCSR); | |
650 | ||
651 | if (list_empty(&chan->vc.desc_issued)) { | |
652 | chan->misaligned = | |
653 | !list_empty(&chan->vc.desc_submitted); | |
654 | } else { | |
655 | vd = list_first_entry(&chan->vc.desc_issued, | |
656 | struct virt_dma_desc, node); | |
657 | pxad_launch_chan(chan, to_pxad_sw_desc(vd)); | |
658 | } | |
659 | } | |
0e15ca5f | 660 | spin_unlock(&chan->vc.lock); |
7d604663 | 661 | wake_up(&chan->wq_state); |
a57e16cf RJ |
662 | |
663 | return IRQ_HANDLED; | |
664 | } | |
665 | ||
666 | static irqreturn_t pxad_int_handler(int irq, void *dev_id) | |
667 | { | |
668 | struct pxad_device *pdev = dev_id; | |
669 | struct pxad_phy *phy; | |
670 | u32 dint = readl(pdev->base + DINT); | |
671 | int i, ret = IRQ_NONE; | |
672 | ||
673 | while (dint) { | |
674 | i = __ffs(dint); | |
675 | dint &= (dint - 1); | |
676 | phy = &pdev->phys[i]; | |
677 | if (pxad_chan_handler(irq, phy) == IRQ_HANDLED) | |
678 | ret = IRQ_HANDLED; | |
679 | } | |
680 | ||
681 | return ret; | |
682 | } | |
683 | ||
684 | static int pxad_alloc_chan_resources(struct dma_chan *dchan) | |
685 | { | |
686 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
687 | struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); | |
688 | ||
689 | if (chan->desc_pool) | |
690 | return 1; | |
691 | ||
692 | chan->desc_pool = dma_pool_create(dma_chan_name(dchan), | |
693 | pdev->slave.dev, | |
694 | sizeof(struct pxad_desc_hw), | |
695 | __alignof__(struct pxad_desc_hw), | |
696 | 0); | |
697 | if (!chan->desc_pool) { | |
698 | dev_err(&chan->vc.chan.dev->device, | |
699 | "%s(): unable to allocate descriptor pool\n", | |
700 | __func__); | |
701 | return -ENOMEM; | |
702 | } | |
703 | ||
704 | return 1; | |
705 | } | |
706 | ||
707 | static void pxad_free_chan_resources(struct dma_chan *dchan) | |
708 | { | |
709 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
710 | ||
711 | vchan_free_chan_resources(&chan->vc); | |
712 | dma_pool_destroy(chan->desc_pool); | |
713 | chan->desc_pool = NULL; | |
714 | ||
88a0513c RJ |
715 | chan->drcmr = U32_MAX; |
716 | chan->prio = PXAD_PRIO_LOWEST; | |
a57e16cf RJ |
717 | } |
718 | ||
719 | static void pxad_free_desc(struct virt_dma_desc *vd) | |
720 | { | |
721 | int i; | |
722 | dma_addr_t dma; | |
723 | struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd); | |
724 | ||
725 | BUG_ON(sw_desc->nb_desc == 0); | |
726 | for (i = sw_desc->nb_desc - 1; i >= 0; i--) { | |
727 | if (i > 0) | |
728 | dma = sw_desc->hw_desc[i - 1]->ddadr; | |
729 | else | |
730 | dma = sw_desc->first; | |
731 | dma_pool_free(sw_desc->desc_pool, | |
732 | sw_desc->hw_desc[i], dma); | |
733 | } | |
734 | sw_desc->nb_desc = 0; | |
735 | kfree(sw_desc); | |
736 | } | |
737 | ||
738 | static struct pxad_desc_sw * | |
739 | pxad_alloc_desc(struct pxad_chan *chan, unsigned int nb_hw_desc) | |
740 | { | |
741 | struct pxad_desc_sw *sw_desc; | |
742 | dma_addr_t dma; | |
743 | int i; | |
744 | ||
50740d5d | 745 | sw_desc = kzalloc(struct_size(sw_desc, hw_desc, nb_hw_desc), |
a57e16cf RJ |
746 | GFP_NOWAIT); |
747 | if (!sw_desc) | |
748 | return NULL; | |
749 | sw_desc->desc_pool = chan->desc_pool; | |
750 | ||
751 | for (i = 0; i < nb_hw_desc; i++) { | |
752 | sw_desc->hw_desc[i] = dma_pool_alloc(sw_desc->desc_pool, | |
753 | GFP_NOWAIT, &dma); | |
754 | if (!sw_desc->hw_desc[i]) { | |
755 | dev_err(&chan->vc.chan.dev->device, | |
756 | "%s(): Couldn't allocate the %dth hw_desc from dma_pool %p\n", | |
757 | __func__, i, sw_desc->desc_pool); | |
758 | goto err; | |
759 | } | |
760 | ||
761 | if (i == 0) | |
762 | sw_desc->first = dma; | |
763 | else | |
764 | sw_desc->hw_desc[i - 1]->ddadr = dma; | |
765 | sw_desc->nb_desc++; | |
766 | } | |
767 | ||
768 | return sw_desc; | |
769 | err: | |
770 | pxad_free_desc(&sw_desc->vd); | |
771 | return NULL; | |
772 | } | |
773 | ||
774 | static dma_cookie_t pxad_tx_submit(struct dma_async_tx_descriptor *tx) | |
775 | { | |
776 | struct virt_dma_chan *vc = to_virt_chan(tx->chan); | |
777 | struct pxad_chan *chan = to_pxad_chan(&vc->chan); | |
778 | struct virt_dma_desc *vd_chained = NULL, | |
779 | *vd = container_of(tx, struct virt_dma_desc, tx); | |
780 | dma_cookie_t cookie; | |
781 | unsigned long flags; | |
782 | ||
783 | set_updater_desc(to_pxad_sw_desc(vd), tx->flags); | |
784 | ||
785 | spin_lock_irqsave(&vc->lock, flags); | |
786 | cookie = dma_cookie_assign(tx); | |
787 | ||
788 | if (list_empty(&vc->desc_submitted) && pxad_try_hotchain(vc, vd)) { | |
789 | list_move_tail(&vd->node, &vc->desc_issued); | |
790 | dev_dbg(&chan->vc.chan.dev->device, | |
791 | "%s(): txd %p[%x]: submitted (hot linked)\n", | |
792 | __func__, vd, cookie); | |
793 | goto out; | |
794 | } | |
795 | ||
796 | /* | |
797 | * Fallback to placing the tx in the submitted queue | |
798 | */ | |
799 | if (!list_empty(&vc->desc_submitted)) { | |
800 | vd_chained = list_entry(vc->desc_submitted.prev, | |
801 | struct virt_dma_desc, node); | |
802 | /* | |
803 | * Only chain the descriptors if no new misalignment is | |
804 | * introduced. If a new misalignment is chained, let the channel | |
805 | * stop, and be relaunched in misalign mode from the irq | |
806 | * handler. | |
807 | */ | |
808 | if (chan->misaligned || !to_pxad_sw_desc(vd)->misaligned) | |
809 | pxad_desc_chain(vd_chained, vd); | |
810 | else | |
811 | vd_chained = NULL; | |
812 | } | |
813 | dev_dbg(&chan->vc.chan.dev->device, | |
814 | "%s(): txd %p[%x]: submitted (%s linked)\n", | |
815 | __func__, vd, cookie, vd_chained ? "cold" : "not"); | |
816 | list_move_tail(&vd->node, &vc->desc_submitted); | |
817 | chan->misaligned |= to_pxad_sw_desc(vd)->misaligned; | |
818 | ||
819 | out: | |
820 | spin_unlock_irqrestore(&vc->lock, flags); | |
821 | return cookie; | |
822 | } | |
823 | ||
824 | static void pxad_issue_pending(struct dma_chan *dchan) | |
825 | { | |
826 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
827 | struct virt_dma_desc *vd_first; | |
828 | unsigned long flags; | |
829 | ||
830 | spin_lock_irqsave(&chan->vc.lock, flags); | |
831 | if (list_empty(&chan->vc.desc_submitted)) | |
832 | goto out; | |
833 | ||
834 | vd_first = list_first_entry(&chan->vc.desc_submitted, | |
835 | struct virt_dma_desc, node); | |
836 | dev_dbg(&chan->vc.chan.dev->device, | |
837 | "%s(): txd %p[%x]", __func__, vd_first, vd_first->tx.cookie); | |
838 | ||
839 | vchan_issue_pending(&chan->vc); | |
840 | if (!pxad_try_hotchain(&chan->vc, vd_first)) | |
841 | pxad_launch_chan(chan, to_pxad_sw_desc(vd_first)); | |
842 | out: | |
843 | spin_unlock_irqrestore(&chan->vc.lock, flags); | |
844 | } | |
845 | ||
846 | static inline struct dma_async_tx_descriptor * | |
847 | pxad_tx_prep(struct virt_dma_chan *vc, struct virt_dma_desc *vd, | |
848 | unsigned long tx_flags) | |
849 | { | |
850 | struct dma_async_tx_descriptor *tx; | |
851 | struct pxad_chan *chan = container_of(vc, struct pxad_chan, vc); | |
852 | ||
aebf5a67 | 853 | INIT_LIST_HEAD(&vd->node); |
a57e16cf RJ |
854 | tx = vchan_tx_prep(vc, vd, tx_flags); |
855 | tx->tx_submit = pxad_tx_submit; | |
856 | dev_dbg(&chan->vc.chan.dev->device, | |
857 | "%s(): vc=%p txd=%p[%x] flags=0x%lx\n", __func__, | |
858 | vc, vd, vd->tx.cookie, | |
859 | tx_flags); | |
860 | ||
861 | return tx; | |
862 | } | |
863 | ||
864 | static void pxad_get_config(struct pxad_chan *chan, | |
865 | enum dma_transfer_direction dir, | |
866 | u32 *dcmd, u32 *dev_src, u32 *dev_dst) | |
867 | { | |
868 | u32 maxburst = 0, dev_addr = 0; | |
869 | enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED; | |
6bab1c6a | 870 | struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); |
a57e16cf RJ |
871 | |
872 | *dcmd = 0; | |
0e95fb9c | 873 | if (dir == DMA_DEV_TO_MEM) { |
a57e16cf RJ |
874 | maxburst = chan->cfg.src_maxburst; |
875 | width = chan->cfg.src_addr_width; | |
876 | dev_addr = chan->cfg.src_addr; | |
877 | *dev_src = dev_addr; | |
e87ffbdf | 878 | *dcmd |= PXA_DCMD_INCTRGADDR; |
6bab1c6a | 879 | if (chan->drcmr <= pdev->nr_requestors) |
e87ffbdf | 880 | *dcmd |= PXA_DCMD_FLOWSRC; |
a57e16cf | 881 | } |
0e95fb9c | 882 | if (dir == DMA_MEM_TO_DEV) { |
a57e16cf RJ |
883 | maxburst = chan->cfg.dst_maxburst; |
884 | width = chan->cfg.dst_addr_width; | |
885 | dev_addr = chan->cfg.dst_addr; | |
886 | *dev_dst = dev_addr; | |
e87ffbdf | 887 | *dcmd |= PXA_DCMD_INCSRCADDR; |
6bab1c6a | 888 | if (chan->drcmr <= pdev->nr_requestors) |
e87ffbdf | 889 | *dcmd |= PXA_DCMD_FLOWTRG; |
a57e16cf | 890 | } |
0e95fb9c | 891 | if (dir == DMA_MEM_TO_MEM) |
a57e16cf RJ |
892 | *dcmd |= PXA_DCMD_BURST32 | PXA_DCMD_INCTRGADDR | |
893 | PXA_DCMD_INCSRCADDR; | |
894 | ||
895 | dev_dbg(&chan->vc.chan.dev->device, | |
896 | "%s(): dev_addr=0x%x maxburst=%d width=%d dir=%d\n", | |
897 | __func__, dev_addr, maxburst, width, dir); | |
898 | ||
899 | if (width == DMA_SLAVE_BUSWIDTH_1_BYTE) | |
900 | *dcmd |= PXA_DCMD_WIDTH1; | |
901 | else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES) | |
902 | *dcmd |= PXA_DCMD_WIDTH2; | |
903 | else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES) | |
904 | *dcmd |= PXA_DCMD_WIDTH4; | |
905 | ||
906 | if (maxburst == 8) | |
907 | *dcmd |= PXA_DCMD_BURST8; | |
908 | else if (maxburst == 16) | |
909 | *dcmd |= PXA_DCMD_BURST16; | |
910 | else if (maxburst == 32) | |
911 | *dcmd |= PXA_DCMD_BURST32; | |
a57e16cf RJ |
912 | } |
913 | ||
914 | static struct dma_async_tx_descriptor * | |
915 | pxad_prep_memcpy(struct dma_chan *dchan, | |
916 | dma_addr_t dma_dst, dma_addr_t dma_src, | |
917 | size_t len, unsigned long flags) | |
918 | { | |
919 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
920 | struct pxad_desc_sw *sw_desc; | |
921 | struct pxad_desc_hw *hw_desc; | |
922 | u32 dcmd; | |
923 | unsigned int i, nb_desc = 0; | |
924 | size_t copy; | |
925 | ||
926 | if (!dchan || !len) | |
927 | return NULL; | |
928 | ||
929 | dev_dbg(&chan->vc.chan.dev->device, | |
930 | "%s(): dma_dst=0x%lx dma_src=0x%lx len=%zu flags=%lx\n", | |
931 | __func__, (unsigned long)dma_dst, (unsigned long)dma_src, | |
932 | len, flags); | |
933 | pxad_get_config(chan, DMA_MEM_TO_MEM, &dcmd, NULL, NULL); | |
934 | ||
935 | nb_desc = DIV_ROUND_UP(len, PDMA_MAX_DESC_BYTES); | |
936 | sw_desc = pxad_alloc_desc(chan, nb_desc + 1); | |
937 | if (!sw_desc) | |
938 | return NULL; | |
939 | sw_desc->len = len; | |
940 | ||
941 | if (!IS_ALIGNED(dma_src, 1 << PDMA_ALIGNMENT) || | |
942 | !IS_ALIGNED(dma_dst, 1 << PDMA_ALIGNMENT)) | |
943 | sw_desc->misaligned = true; | |
944 | ||
945 | i = 0; | |
946 | do { | |
947 | hw_desc = sw_desc->hw_desc[i++]; | |
948 | copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES); | |
949 | hw_desc->dcmd = dcmd | (PXA_DCMD_LENGTH & copy); | |
950 | hw_desc->dsadr = dma_src; | |
951 | hw_desc->dtadr = dma_dst; | |
952 | len -= copy; | |
953 | dma_src += copy; | |
954 | dma_dst += copy; | |
955 | } while (len); | |
956 | set_updater_desc(sw_desc, flags); | |
957 | ||
958 | return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); | |
959 | } | |
960 | ||
961 | static struct dma_async_tx_descriptor * | |
962 | pxad_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, | |
963 | unsigned int sg_len, enum dma_transfer_direction dir, | |
964 | unsigned long flags, void *context) | |
965 | { | |
966 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
967 | struct pxad_desc_sw *sw_desc; | |
968 | size_t len, avail; | |
969 | struct scatterlist *sg; | |
970 | dma_addr_t dma; | |
971 | u32 dcmd, dsadr = 0, dtadr = 0; | |
972 | unsigned int nb_desc = 0, i, j = 0; | |
973 | ||
974 | if ((sgl == NULL) || (sg_len == 0)) | |
975 | return NULL; | |
976 | ||
977 | pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr); | |
978 | dev_dbg(&chan->vc.chan.dev->device, | |
979 | "%s(): dir=%d flags=%lx\n", __func__, dir, flags); | |
980 | ||
981 | for_each_sg(sgl, sg, sg_len, i) | |
982 | nb_desc += DIV_ROUND_UP(sg_dma_len(sg), PDMA_MAX_DESC_BYTES); | |
983 | sw_desc = pxad_alloc_desc(chan, nb_desc + 1); | |
984 | if (!sw_desc) | |
985 | return NULL; | |
986 | ||
987 | for_each_sg(sgl, sg, sg_len, i) { | |
988 | dma = sg_dma_address(sg); | |
989 | avail = sg_dma_len(sg); | |
990 | sw_desc->len += avail; | |
991 | ||
992 | do { | |
993 | len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES); | |
994 | if (dma & 0x7) | |
995 | sw_desc->misaligned = true; | |
996 | ||
997 | sw_desc->hw_desc[j]->dcmd = | |
998 | dcmd | (PXA_DCMD_LENGTH & len); | |
999 | sw_desc->hw_desc[j]->dsadr = dsadr ? dsadr : dma; | |
1000 | sw_desc->hw_desc[j++]->dtadr = dtadr ? dtadr : dma; | |
1001 | ||
1002 | dma += len; | |
1003 | avail -= len; | |
1004 | } while (avail); | |
1005 | } | |
1006 | set_updater_desc(sw_desc, flags); | |
1007 | ||
1008 | return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); | |
1009 | } | |
1010 | ||
1011 | static struct dma_async_tx_descriptor * | |
1012 | pxad_prep_dma_cyclic(struct dma_chan *dchan, | |
1013 | dma_addr_t buf_addr, size_t len, size_t period_len, | |
1014 | enum dma_transfer_direction dir, unsigned long flags) | |
1015 | { | |
1016 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1017 | struct pxad_desc_sw *sw_desc; | |
1018 | struct pxad_desc_hw **phw_desc; | |
1019 | dma_addr_t dma; | |
1020 | u32 dcmd, dsadr = 0, dtadr = 0; | |
1021 | unsigned int nb_desc = 0; | |
1022 | ||
1023 | if (!dchan || !len || !period_len) | |
1024 | return NULL; | |
1025 | if ((dir != DMA_DEV_TO_MEM) && (dir != DMA_MEM_TO_DEV)) { | |
1026 | dev_err(&chan->vc.chan.dev->device, | |
1027 | "Unsupported direction for cyclic DMA\n"); | |
1028 | return NULL; | |
1029 | } | |
1030 | /* the buffer length must be a multiple of period_len */ | |
1031 | if (len % period_len != 0 || period_len > PDMA_MAX_DESC_BYTES || | |
1032 | !IS_ALIGNED(period_len, 1 << PDMA_ALIGNMENT)) | |
1033 | return NULL; | |
1034 | ||
1035 | pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr); | |
f1692127 | 1036 | dcmd |= PXA_DCMD_ENDIRQEN | (PXA_DCMD_LENGTH & period_len); |
a57e16cf RJ |
1037 | dev_dbg(&chan->vc.chan.dev->device, |
1038 | "%s(): buf_addr=0x%lx len=%zu period=%zu dir=%d flags=%lx\n", | |
1039 | __func__, (unsigned long)buf_addr, len, period_len, dir, flags); | |
1040 | ||
1041 | nb_desc = DIV_ROUND_UP(period_len, PDMA_MAX_DESC_BYTES); | |
1042 | nb_desc *= DIV_ROUND_UP(len, period_len); | |
1043 | sw_desc = pxad_alloc_desc(chan, nb_desc + 1); | |
1044 | if (!sw_desc) | |
1045 | return NULL; | |
1046 | sw_desc->cyclic = true; | |
1047 | sw_desc->len = len; | |
1048 | ||
1049 | phw_desc = sw_desc->hw_desc; | |
1050 | dma = buf_addr; | |
1051 | do { | |
1052 | phw_desc[0]->dsadr = dsadr ? dsadr : dma; | |
1053 | phw_desc[0]->dtadr = dtadr ? dtadr : dma; | |
1054 | phw_desc[0]->dcmd = dcmd; | |
1055 | phw_desc++; | |
1056 | dma += period_len; | |
1057 | len -= period_len; | |
1058 | } while (len); | |
1059 | set_updater_desc(sw_desc, flags); | |
1060 | ||
1061 | return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); | |
1062 | } | |
1063 | ||
1064 | static int pxad_config(struct dma_chan *dchan, | |
1065 | struct dma_slave_config *cfg) | |
1066 | { | |
1067 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1068 | ||
1069 | if (!dchan) | |
1070 | return -EINVAL; | |
1071 | ||
1072 | chan->cfg = *cfg; | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static int pxad_terminate_all(struct dma_chan *dchan) | |
1077 | { | |
1078 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1079 | struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); | |
1080 | struct virt_dma_desc *vd = NULL; | |
1081 | unsigned long flags; | |
1082 | struct pxad_phy *phy; | |
1083 | LIST_HEAD(head); | |
1084 | ||
1085 | dev_dbg(&chan->vc.chan.dev->device, | |
1086 | "%s(): vchan %p: terminate all\n", __func__, &chan->vc); | |
1087 | ||
1088 | spin_lock_irqsave(&chan->vc.lock, flags); | |
1089 | vchan_get_all_descriptors(&chan->vc, &head); | |
1090 | ||
1091 | list_for_each_entry(vd, &head, node) { | |
1092 | dev_dbg(&chan->vc.chan.dev->device, | |
1093 | "%s(): cancelling txd %p[%x] (completed=%d)", __func__, | |
1094 | vd, vd->tx.cookie, is_desc_completed(vd)); | |
1095 | } | |
1096 | ||
1097 | phy = chan->phy; | |
1098 | if (phy) { | |
1099 | phy_disable(chan->phy); | |
1100 | pxad_free_phy(chan); | |
1101 | chan->phy = NULL; | |
1102 | spin_lock(&pdev->phy_lock); | |
1103 | phy->vchan = NULL; | |
1104 | spin_unlock(&pdev->phy_lock); | |
1105 | } | |
1106 | spin_unlock_irqrestore(&chan->vc.lock, flags); | |
1107 | vchan_dma_desc_free_list(&chan->vc, &head); | |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | static unsigned int pxad_residue(struct pxad_chan *chan, | |
1113 | dma_cookie_t cookie) | |
1114 | { | |
1115 | struct virt_dma_desc *vd = NULL; | |
1116 | struct pxad_desc_sw *sw_desc = NULL; | |
1117 | struct pxad_desc_hw *hw_desc = NULL; | |
1118 | u32 curr, start, len, end, residue = 0; | |
1119 | unsigned long flags; | |
1120 | bool passed = false; | |
1121 | int i; | |
1122 | ||
1123 | /* | |
1124 | * If the channel does not have a phy pointer anymore, it has already | |
1125 | * been completed. Therefore, its residue is 0. | |
1126 | */ | |
1127 | if (!chan->phy) | |
1128 | return 0; | |
1129 | ||
1130 | spin_lock_irqsave(&chan->vc.lock, flags); | |
1131 | ||
1132 | vd = vchan_find_desc(&chan->vc, cookie); | |
1133 | if (!vd) | |
1134 | goto out; | |
1135 | ||
1136 | sw_desc = to_pxad_sw_desc(vd); | |
1137 | if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR) | |
1138 | curr = phy_readl_relaxed(chan->phy, DSADR); | |
1139 | else | |
1140 | curr = phy_readl_relaxed(chan->phy, DTADR); | |
1141 | ||
7b09a1bb RJ |
1142 | /* |
1143 | * curr has to be actually read before checking descriptor | |
1144 | * completion, so that a curr inside a status updater | |
1145 | * descriptor implies the following test returns true, and | |
1146 | * preventing reordering of curr load and the test. | |
1147 | */ | |
1148 | rmb(); | |
1149 | if (is_desc_completed(vd)) | |
1150 | goto out; | |
1151 | ||
a57e16cf RJ |
1152 | for (i = 0; i < sw_desc->nb_desc - 1; i++) { |
1153 | hw_desc = sw_desc->hw_desc[i]; | |
1154 | if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR) | |
1155 | start = hw_desc->dsadr; | |
1156 | else | |
1157 | start = hw_desc->dtadr; | |
1158 | len = hw_desc->dcmd & PXA_DCMD_LENGTH; | |
1159 | end = start + len; | |
1160 | ||
1161 | /* | |
1162 | * 'passed' will be latched once we found the descriptor | |
1163 | * which lies inside the boundaries of the curr | |
1164 | * pointer. All descriptors that occur in the list | |
1165 | * _after_ we found that partially handled descriptor | |
1166 | * are still to be processed and are hence added to the | |
1167 | * residual bytes counter. | |
1168 | */ | |
1169 | ||
1170 | if (passed) { | |
1171 | residue += len; | |
1172 | } else if (curr >= start && curr <= end) { | |
1173 | residue += end - curr; | |
1174 | passed = true; | |
1175 | } | |
1176 | } | |
1177 | if (!passed) | |
1178 | residue = sw_desc->len; | |
1179 | ||
1180 | out: | |
1181 | spin_unlock_irqrestore(&chan->vc.lock, flags); | |
1182 | dev_dbg(&chan->vc.chan.dev->device, | |
1183 | "%s(): txd %p[%x] sw_desc=%p: %d\n", | |
1184 | __func__, vd, cookie, sw_desc, residue); | |
1185 | return residue; | |
1186 | } | |
1187 | ||
1188 | static enum dma_status pxad_tx_status(struct dma_chan *dchan, | |
1189 | dma_cookie_t cookie, | |
1190 | struct dma_tx_state *txstate) | |
1191 | { | |
1192 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1193 | enum dma_status ret; | |
1194 | ||
e093bf60 RJ |
1195 | if (cookie == chan->bus_error) |
1196 | return DMA_ERROR; | |
1197 | ||
a57e16cf RJ |
1198 | ret = dma_cookie_status(dchan, cookie, txstate); |
1199 | if (likely(txstate && (ret != DMA_ERROR))) | |
1200 | dma_set_residue(txstate, pxad_residue(chan, cookie)); | |
1201 | ||
1202 | return ret; | |
1203 | } | |
1204 | ||
7d604663 RJ |
1205 | static void pxad_synchronize(struct dma_chan *dchan) |
1206 | { | |
1207 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1208 | ||
1209 | wait_event(chan->wq_state, !is_chan_running(chan)); | |
1210 | vchan_synchronize(&chan->vc); | |
1211 | } | |
1212 | ||
a57e16cf RJ |
1213 | static void pxad_free_channels(struct dma_device *dmadev) |
1214 | { | |
1215 | struct pxad_chan *c, *cn; | |
1216 | ||
1217 | list_for_each_entry_safe(c, cn, &dmadev->channels, | |
1218 | vc.chan.device_node) { | |
1219 | list_del(&c->vc.chan.device_node); | |
1220 | tasklet_kill(&c->vc.task); | |
1221 | } | |
1222 | } | |
1223 | ||
1224 | static int pxad_remove(struct platform_device *op) | |
1225 | { | |
1226 | struct pxad_device *pdev = platform_get_drvdata(op); | |
1227 | ||
c01d1b51 | 1228 | pxad_cleanup_debugfs(pdev); |
a57e16cf | 1229 | pxad_free_channels(&pdev->slave); |
a57e16cf RJ |
1230 | return 0; |
1231 | } | |
1232 | ||
1233 | static int pxad_init_phys(struct platform_device *op, | |
1234 | struct pxad_device *pdev, | |
1235 | unsigned int nb_phy_chans) | |
1236 | { | |
1237 | int irq0, irq, nr_irq = 0, i, ret; | |
1238 | struct pxad_phy *phy; | |
1239 | ||
1240 | irq0 = platform_get_irq(op, 0); | |
1241 | if (irq0 < 0) | |
1242 | return irq0; | |
1243 | ||
1244 | pdev->phys = devm_kcalloc(&op->dev, nb_phy_chans, | |
1245 | sizeof(pdev->phys[0]), GFP_KERNEL); | |
1246 | if (!pdev->phys) | |
1247 | return -ENOMEM; | |
1248 | ||
1249 | for (i = 0; i < nb_phy_chans; i++) | |
b3d726cb | 1250 | if (platform_get_irq_optional(op, i) > 0) |
a57e16cf RJ |
1251 | nr_irq++; |
1252 | ||
1253 | for (i = 0; i < nb_phy_chans; i++) { | |
1254 | phy = &pdev->phys[i]; | |
1255 | phy->base = pdev->base; | |
1256 | phy->idx = i; | |
b3d726cb | 1257 | irq = platform_get_irq_optional(op, i); |
a57e16cf RJ |
1258 | if ((nr_irq > 1) && (irq > 0)) |
1259 | ret = devm_request_irq(&op->dev, irq, | |
1260 | pxad_chan_handler, | |
1261 | IRQF_SHARED, "pxa-dma", phy); | |
1262 | if ((nr_irq == 1) && (i == 0)) | |
1263 | ret = devm_request_irq(&op->dev, irq0, | |
1264 | pxad_int_handler, | |
1265 | IRQF_SHARED, "pxa-dma", pdev); | |
1266 | if (ret) { | |
1267 | dev_err(pdev->slave.dev, | |
1268 | "%s(): can't request irq %d:%d\n", __func__, | |
1269 | irq, ret); | |
1270 | return ret; | |
1271 | } | |
1272 | } | |
1273 | ||
1274 | return 0; | |
1275 | } | |
1276 | ||
4e0def88 | 1277 | static const struct of_device_id pxad_dt_ids[] = { |
a57e16cf RJ |
1278 | { .compatible = "marvell,pdma-1.0", }, |
1279 | {} | |
1280 | }; | |
1281 | MODULE_DEVICE_TABLE(of, pxad_dt_ids); | |
1282 | ||
1283 | static struct dma_chan *pxad_dma_xlate(struct of_phandle_args *dma_spec, | |
1284 | struct of_dma *ofdma) | |
1285 | { | |
1286 | struct pxad_device *d = ofdma->of_dma_data; | |
1287 | struct dma_chan *chan; | |
1288 | ||
1289 | chan = dma_get_any_slave_channel(&d->slave); | |
1290 | if (!chan) | |
1291 | return NULL; | |
1292 | ||
1293 | to_pxad_chan(chan)->drcmr = dma_spec->args[0]; | |
1294 | to_pxad_chan(chan)->prio = dma_spec->args[1]; | |
1295 | ||
1296 | return chan; | |
1297 | } | |
1298 | ||
1299 | static int pxad_init_dmadev(struct platform_device *op, | |
1300 | struct pxad_device *pdev, | |
6bab1c6a RJ |
1301 | unsigned int nr_phy_chans, |
1302 | unsigned int nr_requestors) | |
a57e16cf RJ |
1303 | { |
1304 | int ret; | |
1305 | unsigned int i; | |
1306 | struct pxad_chan *c; | |
1307 | ||
1308 | pdev->nr_chans = nr_phy_chans; | |
6bab1c6a | 1309 | pdev->nr_requestors = nr_requestors; |
a57e16cf RJ |
1310 | INIT_LIST_HEAD(&pdev->slave.channels); |
1311 | pdev->slave.device_alloc_chan_resources = pxad_alloc_chan_resources; | |
1312 | pdev->slave.device_free_chan_resources = pxad_free_chan_resources; | |
1313 | pdev->slave.device_tx_status = pxad_tx_status; | |
1314 | pdev->slave.device_issue_pending = pxad_issue_pending; | |
1315 | pdev->slave.device_config = pxad_config; | |
7d604663 | 1316 | pdev->slave.device_synchronize = pxad_synchronize; |
a57e16cf RJ |
1317 | pdev->slave.device_terminate_all = pxad_terminate_all; |
1318 | ||
1319 | if (op->dev.coherent_dma_mask) | |
1320 | dma_set_mask(&op->dev, op->dev.coherent_dma_mask); | |
1321 | else | |
1322 | dma_set_mask(&op->dev, DMA_BIT_MASK(32)); | |
1323 | ||
1324 | ret = pxad_init_phys(op, pdev, nr_phy_chans); | |
1325 | if (ret) | |
1326 | return ret; | |
1327 | ||
1328 | for (i = 0; i < nr_phy_chans; i++) { | |
1329 | c = devm_kzalloc(&op->dev, sizeof(*c), GFP_KERNEL); | |
1330 | if (!c) | |
1331 | return -ENOMEM; | |
88a0513c RJ |
1332 | |
1333 | c->drcmr = U32_MAX; | |
1334 | c->prio = PXAD_PRIO_LOWEST; | |
a57e16cf RJ |
1335 | c->vc.desc_free = pxad_free_desc; |
1336 | vchan_init(&c->vc, &pdev->slave); | |
7d604663 | 1337 | init_waitqueue_head(&c->wq_state); |
a57e16cf RJ |
1338 | } |
1339 | ||
d72c5f98 | 1340 | return dmaenginem_async_device_register(&pdev->slave); |
a57e16cf RJ |
1341 | } |
1342 | ||
1343 | static int pxad_probe(struct platform_device *op) | |
1344 | { | |
1345 | struct pxad_device *pdev; | |
1346 | const struct of_device_id *of_id; | |
420c0117 | 1347 | const struct dma_slave_map *slave_map = NULL; |
a57e16cf | 1348 | struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev); |
420c0117 | 1349 | int ret, dma_channels = 0, nb_requestors = 0, slave_map_cnt = 0; |
a57e16cf RJ |
1350 | const enum dma_slave_buswidth widths = |
1351 | DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES | | |
1352 | DMA_SLAVE_BUSWIDTH_4_BYTES; | |
1353 | ||
1354 | pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL); | |
1355 | if (!pdev) | |
1356 | return -ENOMEM; | |
1357 | ||
1358 | spin_lock_init(&pdev->phy_lock); | |
1359 | ||
4b23603a | 1360 | pdev->base = devm_platform_ioremap_resource(op, 0); |
a57e16cf RJ |
1361 | if (IS_ERR(pdev->base)) |
1362 | return PTR_ERR(pdev->base); | |
1363 | ||
1364 | of_id = of_match_device(pxad_dt_ids, &op->dev); | |
6bab1c6a | 1365 | if (of_id) { |
d9cb0a4c KK |
1366 | /* Parse new and deprecated dma-channels properties */ |
1367 | if (of_property_read_u32(op->dev.of_node, "dma-channels", | |
1368 | &dma_channels)) | |
1369 | of_property_read_u32(op->dev.of_node, "#dma-channels", | |
1370 | &dma_channels); | |
1371 | /* Parse new and deprecated dma-requests properties */ | |
1372 | ret = of_property_read_u32(op->dev.of_node, "dma-requests", | |
6bab1c6a | 1373 | &nb_requestors); |
d9cb0a4c KK |
1374 | if (ret) |
1375 | ret = of_property_read_u32(op->dev.of_node, "#dma-requests", | |
1376 | &nb_requestors); | |
6bab1c6a RJ |
1377 | if (ret) { |
1378 | dev_warn(pdev->slave.dev, | |
1379 | "#dma-requests set to default 32 as missing in OF: %d", | |
1380 | ret); | |
1381 | nb_requestors = 32; | |
a436ff1e | 1382 | } |
6bab1c6a | 1383 | } else if (pdata && pdata->dma_channels) { |
a57e16cf | 1384 | dma_channels = pdata->dma_channels; |
6bab1c6a | 1385 | nb_requestors = pdata->nb_requestors; |
420c0117 RJ |
1386 | slave_map = pdata->slave_map; |
1387 | slave_map_cnt = pdata->slave_map_cnt; | |
6bab1c6a | 1388 | } else { |
a57e16cf | 1389 | dma_channels = 32; /* default 32 channel */ |
6bab1c6a | 1390 | } |
a57e16cf RJ |
1391 | |
1392 | dma_cap_set(DMA_SLAVE, pdev->slave.cap_mask); | |
1393 | dma_cap_set(DMA_MEMCPY, pdev->slave.cap_mask); | |
1394 | dma_cap_set(DMA_CYCLIC, pdev->slave.cap_mask); | |
1395 | dma_cap_set(DMA_PRIVATE, pdev->slave.cap_mask); | |
1396 | pdev->slave.device_prep_dma_memcpy = pxad_prep_memcpy; | |
1397 | pdev->slave.device_prep_slave_sg = pxad_prep_slave_sg; | |
1398 | pdev->slave.device_prep_dma_cyclic = pxad_prep_dma_cyclic; | |
420c0117 RJ |
1399 | pdev->slave.filter.map = slave_map; |
1400 | pdev->slave.filter.mapcnt = slave_map_cnt; | |
1401 | pdev->slave.filter.fn = pxad_filter_fn; | |
a57e16cf RJ |
1402 | |
1403 | pdev->slave.copy_align = PDMA_ALIGNMENT; | |
1404 | pdev->slave.src_addr_widths = widths; | |
1405 | pdev->slave.dst_addr_widths = widths; | |
1406 | pdev->slave.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); | |
1407 | pdev->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; | |
d3651b8e | 1408 | pdev->slave.descriptor_reuse = true; |
a57e16cf RJ |
1409 | |
1410 | pdev->slave.dev = &op->dev; | |
6bab1c6a | 1411 | ret = pxad_init_dmadev(op, pdev, dma_channels, nb_requestors); |
a57e16cf RJ |
1412 | if (ret) { |
1413 | dev_err(pdev->slave.dev, "unable to register\n"); | |
1414 | return ret; | |
1415 | } | |
1416 | ||
1417 | if (op->dev.of_node) { | |
1418 | /* Device-tree DMA controller registration */ | |
1419 | ret = of_dma_controller_register(op->dev.of_node, | |
1420 | pxad_dma_xlate, pdev); | |
1421 | if (ret < 0) { | |
1422 | dev_err(pdev->slave.dev, | |
1423 | "of_dma_controller_register failed\n"); | |
1424 | return ret; | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | platform_set_drvdata(op, pdev); | |
c01d1b51 | 1429 | pxad_init_debugfs(pdev); |
6bab1c6a RJ |
1430 | dev_info(pdev->slave.dev, "initialized %d channels on %d requestors\n", |
1431 | dma_channels, nb_requestors); | |
a57e16cf RJ |
1432 | return 0; |
1433 | } | |
1434 | ||
1435 | static const struct platform_device_id pxad_id_table[] = { | |
1436 | { "pxa-dma", }, | |
1437 | { }, | |
1438 | }; | |
1439 | ||
1440 | static struct platform_driver pxad_driver = { | |
1441 | .driver = { | |
1442 | .name = "pxa-dma", | |
1443 | .of_match_table = pxad_dt_ids, | |
1444 | }, | |
1445 | .id_table = pxad_id_table, | |
1446 | .probe = pxad_probe, | |
1447 | .remove = pxad_remove, | |
1448 | }; | |
1449 | ||
c2a70a31 | 1450 | static bool pxad_filter_fn(struct dma_chan *chan, void *param) |
a57e16cf RJ |
1451 | { |
1452 | struct pxad_chan *c = to_pxad_chan(chan); | |
1453 | struct pxad_param *p = param; | |
1454 | ||
1455 | if (chan->device->dev->driver != &pxad_driver.driver) | |
1456 | return false; | |
1457 | ||
1458 | c->drcmr = p->drcmr; | |
1459 | c->prio = p->prio; | |
1460 | ||
1461 | return true; | |
1462 | } | |
a57e16cf RJ |
1463 | |
1464 | module_platform_driver(pxad_driver); | |
1465 | ||
1466 | MODULE_DESCRIPTION("Marvell PXA Peripheral DMA Driver"); | |
1467 | MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>"); | |
1468 | MODULE_LICENSE("GPL v2"); |