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a57e16cf RJ |
1 | /* |
2 | * Copyright 2015 Robert Jarzmik <robert.jarzmik@free.fr> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/err.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/dma-mapping.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/dmaengine.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/platform_data/mmp_dma.h> | |
20 | #include <linux/dmapool.h> | |
21 | #include <linux/of_device.h> | |
22 | #include <linux/of_dma.h> | |
23 | #include <linux/of.h> | |
24 | #include <linux/dma/pxa-dma.h> | |
25 | ||
26 | #include "dmaengine.h" | |
27 | #include "virt-dma.h" | |
28 | ||
29 | #define DCSR(n) (0x0000 + ((n) << 2)) | |
30 | #define DALGN(n) 0x00a0 | |
31 | #define DINT 0x00f0 | |
32 | #define DDADR(n) (0x0200 + ((n) << 4)) | |
33 | #define DSADR(n) (0x0204 + ((n) << 4)) | |
34 | #define DTADR(n) (0x0208 + ((n) << 4)) | |
35 | #define DCMD(n) (0x020c + ((n) << 4)) | |
36 | ||
37 | #define PXA_DCSR_RUN BIT(31) /* Run Bit (read / write) */ | |
38 | #define PXA_DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */ | |
39 | #define PXA_DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (R/W) */ | |
40 | #define PXA_DCSR_REQPEND BIT(8) /* Request Pending (read-only) */ | |
41 | #define PXA_DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */ | |
42 | #define PXA_DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */ | |
43 | #define PXA_DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */ | |
44 | #define PXA_DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */ | |
45 | ||
46 | #define PXA_DCSR_EORIRQEN BIT(28) /* End of Receive IRQ Enable (R/W) */ | |
47 | #define PXA_DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */ | |
48 | #define PXA_DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */ | |
49 | #define PXA_DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */ | |
50 | #define PXA_DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */ | |
51 | #define PXA_DCSR_CMPST BIT(10) /* The Descriptor Compare Status */ | |
52 | #define PXA_DCSR_EORINTR BIT(9) /* The end of Receive */ | |
53 | ||
54 | #define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */ | |
55 | #define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */ | |
56 | ||
57 | #define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */ | |
58 | #define DDADR_STOP BIT(0) /* Stop (read / write) */ | |
59 | ||
60 | #define PXA_DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */ | |
61 | #define PXA_DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */ | |
62 | #define PXA_DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */ | |
63 | #define PXA_DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */ | |
64 | #define PXA_DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */ | |
65 | #define PXA_DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */ | |
66 | #define PXA_DCMD_ENDIAN BIT(18) /* Device Endian-ness. */ | |
67 | #define PXA_DCMD_BURST8 (1 << 16) /* 8 byte burst */ | |
68 | #define PXA_DCMD_BURST16 (2 << 16) /* 16 byte burst */ | |
69 | #define PXA_DCMD_BURST32 (3 << 16) /* 32 byte burst */ | |
70 | #define PXA_DCMD_WIDTH1 (1 << 14) /* 1 byte width */ | |
71 | #define PXA_DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */ | |
72 | #define PXA_DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */ | |
73 | #define PXA_DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */ | |
74 | ||
75 | #define PDMA_ALIGNMENT 3 | |
76 | #define PDMA_MAX_DESC_BYTES (PXA_DCMD_LENGTH & ~((1 << PDMA_ALIGNMENT) - 1)) | |
77 | ||
78 | struct pxad_desc_hw { | |
79 | u32 ddadr; /* Points to the next descriptor + flags */ | |
80 | u32 dsadr; /* DSADR value for the current transfer */ | |
81 | u32 dtadr; /* DTADR value for the current transfer */ | |
82 | u32 dcmd; /* DCMD value for the current transfer */ | |
83 | } __aligned(16); | |
84 | ||
85 | struct pxad_desc_sw { | |
86 | struct virt_dma_desc vd; /* Virtual descriptor */ | |
87 | int nb_desc; /* Number of hw. descriptors */ | |
88 | size_t len; /* Number of bytes xfered */ | |
89 | dma_addr_t first; /* First descriptor's addr */ | |
90 | ||
91 | /* At least one descriptor has an src/dst address not multiple of 8 */ | |
92 | bool misaligned; | |
93 | bool cyclic; | |
94 | struct dma_pool *desc_pool; /* Channel's used allocator */ | |
95 | ||
96 | struct pxad_desc_hw *hw_desc[]; /* DMA coherent descriptors */ | |
97 | }; | |
98 | ||
99 | struct pxad_phy { | |
100 | int idx; | |
101 | void __iomem *base; | |
102 | struct pxad_chan *vchan; | |
103 | }; | |
104 | ||
105 | struct pxad_chan { | |
106 | struct virt_dma_chan vc; /* Virtual channel */ | |
107 | u32 drcmr; /* Requestor of the channel */ | |
108 | enum pxad_chan_prio prio; /* Required priority of phy */ | |
109 | /* | |
110 | * At least one desc_sw in submitted or issued transfers on this channel | |
111 | * has one address such as: addr % 8 != 0. This implies the DALGN | |
112 | * setting on the phy. | |
113 | */ | |
114 | bool misaligned; | |
115 | struct dma_slave_config cfg; /* Runtime config */ | |
116 | ||
117 | /* protected by vc->lock */ | |
118 | struct pxad_phy *phy; | |
119 | struct dma_pool *desc_pool; /* Descriptors pool */ | |
e093bf60 | 120 | dma_cookie_t bus_error; |
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; | |
132 | struct dentry *dbgfs_state; | |
133 | struct dentry **dbgfs_chan; | |
134 | #endif | |
a57e16cf RJ |
135 | }; |
136 | ||
137 | #define tx_to_pxad_desc(tx) \ | |
138 | container_of(tx, struct pxad_desc_sw, async_tx) | |
139 | #define to_pxad_chan(dchan) \ | |
140 | container_of(dchan, struct pxad_chan, vc.chan) | |
141 | #define to_pxad_dev(dmadev) \ | |
142 | container_of(dmadev, struct pxad_device, slave) | |
143 | #define to_pxad_sw_desc(_vd) \ | |
144 | container_of((_vd), struct pxad_desc_sw, vd) | |
145 | ||
146 | #define _phy_readl_relaxed(phy, _reg) \ | |
147 | readl_relaxed((phy)->base + _reg((phy)->idx)) | |
148 | #define phy_readl_relaxed(phy, _reg) \ | |
149 | ({ \ | |
150 | u32 _v; \ | |
151 | _v = readl_relaxed((phy)->base + _reg((phy)->idx)); \ | |
152 | dev_vdbg(&phy->vchan->vc.chan.dev->device, \ | |
153 | "%s(): readl(%s): 0x%08x\n", __func__, #_reg, \ | |
154 | _v); \ | |
155 | _v; \ | |
156 | }) | |
157 | #define phy_writel(phy, val, _reg) \ | |
158 | do { \ | |
159 | writel((val), (phy)->base + _reg((phy)->idx)); \ | |
160 | dev_vdbg(&phy->vchan->vc.chan.dev->device, \ | |
161 | "%s(): writel(0x%08x, %s)\n", \ | |
162 | __func__, (u32)(val), #_reg); \ | |
163 | } while (0) | |
164 | #define phy_writel_relaxed(phy, val, _reg) \ | |
165 | do { \ | |
166 | writel_relaxed((val), (phy)->base + _reg((phy)->idx)); \ | |
167 | dev_vdbg(&phy->vchan->vc.chan.dev->device, \ | |
168 | "%s(): writel_relaxed(0x%08x, %s)\n", \ | |
169 | __func__, (u32)(val), #_reg); \ | |
170 | } while (0) | |
171 | ||
172 | static unsigned int pxad_drcmr(unsigned int line) | |
173 | { | |
174 | if (line < 64) | |
175 | return 0x100 + line * 4; | |
176 | return 0x1000 + line * 4; | |
177 | } | |
c01d1b51 RJ |
178 | |
179 | /* | |
180 | * Debug fs | |
181 | */ | |
182 | #ifdef CONFIG_DEBUG_FS | |
183 | #include <linux/debugfs.h> | |
184 | #include <linux/uaccess.h> | |
185 | #include <linux/seq_file.h> | |
186 | ||
187 | static int dbg_show_requester_chan(struct seq_file *s, void *p) | |
188 | { | |
c01d1b51 RJ |
189 | struct pxad_phy *phy = s->private; |
190 | int i; | |
191 | u32 drcmr; | |
192 | ||
4a736d15 | 193 | seq_printf(s, "DMA channel %d requester :\n", phy->idx); |
c01d1b51 RJ |
194 | for (i = 0; i < 70; i++) { |
195 | drcmr = readl_relaxed(phy->base + pxad_drcmr(i)); | |
196 | if ((drcmr & DRCMR_CHLNUM) == phy->idx) | |
4a736d15 RJ |
197 | seq_printf(s, "\tRequester %d (MAPVLD=%d)\n", i, |
198 | !!(drcmr & DRCMR_MAPVLD)); | |
c01d1b51 | 199 | } |
4a736d15 | 200 | return 0; |
c01d1b51 RJ |
201 | } |
202 | ||
203 | static inline int dbg_burst_from_dcmd(u32 dcmd) | |
204 | { | |
205 | int burst = (dcmd >> 16) & 0x3; | |
206 | ||
207 | return burst ? 4 << burst : 0; | |
208 | } | |
209 | ||
210 | static int is_phys_valid(unsigned long addr) | |
211 | { | |
212 | return pfn_valid(__phys_to_pfn(addr)); | |
213 | } | |
214 | ||
215 | #define PXA_DCSR_STR(flag) (dcsr & PXA_DCSR_##flag ? #flag" " : "") | |
216 | #define PXA_DCMD_STR(flag) (dcmd & PXA_DCMD_##flag ? #flag" " : "") | |
217 | ||
218 | static int dbg_show_descriptors(struct seq_file *s, void *p) | |
219 | { | |
220 | struct pxad_phy *phy = s->private; | |
221 | int i, max_show = 20, burst, width; | |
222 | u32 dcmd; | |
223 | unsigned long phys_desc, ddadr; | |
224 | struct pxad_desc_hw *desc; | |
225 | ||
226 | phys_desc = ddadr = _phy_readl_relaxed(phy, DDADR); | |
227 | ||
228 | seq_printf(s, "DMA channel %d descriptors :\n", phy->idx); | |
229 | seq_printf(s, "[%03d] First descriptor unknown\n", 0); | |
230 | for (i = 1; i < max_show && is_phys_valid(phys_desc); i++) { | |
231 | desc = phys_to_virt(phys_desc); | |
232 | dcmd = desc->dcmd; | |
233 | burst = dbg_burst_from_dcmd(dcmd); | |
234 | width = (1 << ((dcmd >> 14) & 0x3)) >> 1; | |
235 | ||
236 | seq_printf(s, "[%03d] Desc at %08lx(virt %p)\n", | |
237 | i, phys_desc, desc); | |
238 | seq_printf(s, "\tDDADR = %08x\n", desc->ddadr); | |
239 | seq_printf(s, "\tDSADR = %08x\n", desc->dsadr); | |
240 | seq_printf(s, "\tDTADR = %08x\n", desc->dtadr); | |
241 | seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n", | |
242 | dcmd, | |
243 | PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR), | |
244 | PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG), | |
245 | PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN), | |
246 | PXA_DCMD_STR(ENDIAN), burst, width, | |
247 | dcmd & PXA_DCMD_LENGTH); | |
248 | phys_desc = desc->ddadr; | |
249 | } | |
250 | if (i == max_show) | |
251 | seq_printf(s, "[%03d] Desc at %08lx ... max display reached\n", | |
252 | i, phys_desc); | |
253 | else | |
254 | seq_printf(s, "[%03d] Desc at %08lx is %s\n", | |
255 | i, phys_desc, phys_desc == DDADR_STOP ? | |
256 | "DDADR_STOP" : "invalid"); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static int dbg_show_chan_state(struct seq_file *s, void *p) | |
262 | { | |
263 | struct pxad_phy *phy = s->private; | |
264 | u32 dcsr, dcmd; | |
265 | int burst, width; | |
266 | static const char * const str_prio[] = { | |
267 | "high", "normal", "low", "invalid" | |
268 | }; | |
269 | ||
270 | dcsr = _phy_readl_relaxed(phy, DCSR); | |
271 | dcmd = _phy_readl_relaxed(phy, DCMD); | |
272 | burst = dbg_burst_from_dcmd(dcmd); | |
273 | width = (1 << ((dcmd >> 14) & 0x3)) >> 1; | |
274 | ||
275 | seq_printf(s, "DMA channel %d\n", phy->idx); | |
276 | seq_printf(s, "\tPriority : %s\n", | |
277 | str_prio[(phy->idx & 0xf) / 4]); | |
278 | seq_printf(s, "\tUnaligned transfer bit: %s\n", | |
279 | _phy_readl_relaxed(phy, DALGN) & BIT(phy->idx) ? | |
280 | "yes" : "no"); | |
281 | seq_printf(s, "\tDCSR = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n", | |
282 | dcsr, PXA_DCSR_STR(RUN), PXA_DCSR_STR(NODESC), | |
283 | PXA_DCSR_STR(STOPIRQEN), PXA_DCSR_STR(EORIRQEN), | |
284 | PXA_DCSR_STR(EORJMPEN), PXA_DCSR_STR(EORSTOPEN), | |
285 | PXA_DCSR_STR(SETCMPST), PXA_DCSR_STR(CLRCMPST), | |
286 | PXA_DCSR_STR(CMPST), PXA_DCSR_STR(EORINTR), | |
287 | PXA_DCSR_STR(REQPEND), PXA_DCSR_STR(STOPSTATE), | |
288 | PXA_DCSR_STR(ENDINTR), PXA_DCSR_STR(STARTINTR), | |
289 | PXA_DCSR_STR(BUSERR)); | |
290 | ||
291 | seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n", | |
292 | dcmd, | |
293 | PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR), | |
294 | PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG), | |
295 | PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN), | |
296 | PXA_DCMD_STR(ENDIAN), burst, width, dcmd & PXA_DCMD_LENGTH); | |
297 | seq_printf(s, "\tDSADR = %08x\n", _phy_readl_relaxed(phy, DSADR)); | |
298 | seq_printf(s, "\tDTADR = %08x\n", _phy_readl_relaxed(phy, DTADR)); | |
299 | seq_printf(s, "\tDDADR = %08x\n", _phy_readl_relaxed(phy, DDADR)); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int dbg_show_state(struct seq_file *s, void *p) | |
305 | { | |
306 | struct pxad_device *pdev = s->private; | |
307 | ||
308 | /* basic device status */ | |
309 | seq_puts(s, "DMA engine status\n"); | |
310 | seq_printf(s, "\tChannel number: %d\n", pdev->nr_chans); | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | #define DBGFS_FUNC_DECL(name) \ | |
316 | static int dbg_open_##name(struct inode *inode, struct file *file) \ | |
317 | { \ | |
318 | return single_open(file, dbg_show_##name, inode->i_private); \ | |
319 | } \ | |
320 | static const struct file_operations dbg_fops_##name = { \ | |
321 | .owner = THIS_MODULE, \ | |
322 | .open = dbg_open_##name, \ | |
323 | .llseek = seq_lseek, \ | |
324 | .read = seq_read, \ | |
325 | .release = single_release, \ | |
326 | } | |
327 | ||
328 | DBGFS_FUNC_DECL(state); | |
329 | DBGFS_FUNC_DECL(chan_state); | |
330 | DBGFS_FUNC_DECL(descriptors); | |
331 | DBGFS_FUNC_DECL(requester_chan); | |
332 | ||
333 | static struct dentry *pxad_dbg_alloc_chan(struct pxad_device *pdev, | |
334 | int ch, struct dentry *chandir) | |
335 | { | |
336 | char chan_name[11]; | |
337 | struct dentry *chan, *chan_state = NULL, *chan_descr = NULL; | |
338 | struct dentry *chan_reqs = NULL; | |
339 | void *dt; | |
340 | ||
341 | scnprintf(chan_name, sizeof(chan_name), "%d", ch); | |
342 | chan = debugfs_create_dir(chan_name, chandir); | |
343 | dt = (void *)&pdev->phys[ch]; | |
344 | ||
345 | if (chan) | |
346 | chan_state = debugfs_create_file("state", 0400, chan, dt, | |
347 | &dbg_fops_chan_state); | |
348 | if (chan_state) | |
349 | chan_descr = debugfs_create_file("descriptors", 0400, chan, dt, | |
350 | &dbg_fops_descriptors); | |
351 | if (chan_descr) | |
352 | chan_reqs = debugfs_create_file("requesters", 0400, chan, dt, | |
353 | &dbg_fops_requester_chan); | |
354 | if (!chan_reqs) | |
355 | goto err_state; | |
356 | ||
357 | return chan; | |
358 | ||
359 | err_state: | |
360 | debugfs_remove_recursive(chan); | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | static void pxad_init_debugfs(struct pxad_device *pdev) | |
365 | { | |
366 | int i; | |
367 | struct dentry *chandir; | |
368 | ||
369 | pdev->dbgfs_root = debugfs_create_dir(dev_name(pdev->slave.dev), NULL); | |
370 | if (IS_ERR(pdev->dbgfs_root) || !pdev->dbgfs_root) | |
371 | goto err_root; | |
372 | ||
373 | pdev->dbgfs_state = debugfs_create_file("state", 0400, pdev->dbgfs_root, | |
374 | pdev, &dbg_fops_state); | |
375 | if (!pdev->dbgfs_state) | |
376 | goto err_state; | |
377 | ||
378 | pdev->dbgfs_chan = | |
379 | kmalloc_array(pdev->nr_chans, sizeof(*pdev->dbgfs_state), | |
380 | GFP_KERNEL); | |
381 | if (!pdev->dbgfs_chan) | |
382 | goto err_alloc; | |
383 | ||
384 | chandir = debugfs_create_dir("channels", pdev->dbgfs_root); | |
385 | if (!chandir) | |
386 | goto err_chandir; | |
387 | ||
388 | for (i = 0; i < pdev->nr_chans; i++) { | |
389 | pdev->dbgfs_chan[i] = pxad_dbg_alloc_chan(pdev, i, chandir); | |
390 | if (!pdev->dbgfs_chan[i]) | |
391 | goto err_chans; | |
392 | } | |
393 | ||
394 | return; | |
395 | err_chans: | |
396 | err_chandir: | |
397 | kfree(pdev->dbgfs_chan); | |
398 | err_alloc: | |
399 | err_state: | |
400 | debugfs_remove_recursive(pdev->dbgfs_root); | |
401 | err_root: | |
402 | pr_err("pxad: debugfs is not available\n"); | |
403 | } | |
404 | ||
405 | static void pxad_cleanup_debugfs(struct pxad_device *pdev) | |
406 | { | |
407 | debugfs_remove_recursive(pdev->dbgfs_root); | |
408 | } | |
409 | #else | |
410 | static inline void pxad_init_debugfs(struct pxad_device *pdev) {} | |
411 | static inline void pxad_cleanup_debugfs(struct pxad_device *pdev) {} | |
412 | #endif | |
413 | ||
c91134d9 RJ |
414 | /* |
415 | * In the transition phase where legacy pxa handling is done at the same time as | |
416 | * mmp_dma, the DMA physical channel split between the 2 DMA providers is done | |
417 | * through legacy_reserved. Legacy code reserves DMA channels by settings | |
418 | * corresponding bits in legacy_reserved. | |
419 | */ | |
420 | static u32 legacy_reserved; | |
421 | static u32 legacy_unavailable; | |
422 | ||
a57e16cf RJ |
423 | static struct pxad_phy *lookup_phy(struct pxad_chan *pchan) |
424 | { | |
425 | int prio, i; | |
426 | struct pxad_device *pdev = to_pxad_dev(pchan->vc.chan.device); | |
427 | struct pxad_phy *phy, *found = NULL; | |
428 | unsigned long flags; | |
429 | ||
430 | /* | |
431 | * dma channel priorities | |
432 | * ch 0 - 3, 16 - 19 <--> (0) | |
433 | * ch 4 - 7, 20 - 23 <--> (1) | |
434 | * ch 8 - 11, 24 - 27 <--> (2) | |
435 | * ch 12 - 15, 28 - 31 <--> (3) | |
436 | */ | |
437 | ||
438 | spin_lock_irqsave(&pdev->phy_lock, flags); | |
439 | for (prio = pchan->prio; prio >= PXAD_PRIO_HIGHEST; prio--) { | |
440 | for (i = 0; i < pdev->nr_chans; i++) { | |
441 | if (prio != (i & 0xf) >> 2) | |
442 | continue; | |
c91134d9 RJ |
443 | if ((i < 32) && (legacy_reserved & BIT(i))) |
444 | continue; | |
a57e16cf RJ |
445 | phy = &pdev->phys[i]; |
446 | if (!phy->vchan) { | |
447 | phy->vchan = pchan; | |
448 | found = phy; | |
c91134d9 RJ |
449 | if (i < 32) |
450 | legacy_unavailable |= BIT(i); | |
a57e16cf RJ |
451 | goto out_unlock; |
452 | } | |
453 | } | |
454 | } | |
455 | ||
456 | out_unlock: | |
457 | spin_unlock_irqrestore(&pdev->phy_lock, flags); | |
458 | dev_dbg(&pchan->vc.chan.dev->device, | |
459 | "%s(): phy=%p(%d)\n", __func__, found, | |
460 | found ? found->idx : -1); | |
461 | ||
462 | return found; | |
463 | } | |
464 | ||
465 | static void pxad_free_phy(struct pxad_chan *chan) | |
466 | { | |
467 | struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); | |
468 | unsigned long flags; | |
469 | u32 reg; | |
c91134d9 | 470 | int i; |
a57e16cf RJ |
471 | |
472 | dev_dbg(&chan->vc.chan.dev->device, | |
473 | "%s(): freeing\n", __func__); | |
474 | if (!chan->phy) | |
475 | return; | |
476 | ||
477 | /* clear the channel mapping in DRCMR */ | |
6bab1c6a | 478 | if (chan->drcmr <= pdev->nr_requestors) { |
e87ffbdf RJ |
479 | reg = pxad_drcmr(chan->drcmr); |
480 | writel_relaxed(0, chan->phy->base + reg); | |
481 | } | |
a57e16cf RJ |
482 | |
483 | spin_lock_irqsave(&pdev->phy_lock, flags); | |
c91134d9 RJ |
484 | for (i = 0; i < 32; i++) |
485 | if (chan->phy == &pdev->phys[i]) | |
486 | legacy_unavailable &= ~BIT(i); | |
a57e16cf RJ |
487 | chan->phy->vchan = NULL; |
488 | chan->phy = NULL; | |
489 | spin_unlock_irqrestore(&pdev->phy_lock, flags); | |
490 | } | |
491 | ||
492 | static bool is_chan_running(struct pxad_chan *chan) | |
493 | { | |
494 | u32 dcsr; | |
495 | struct pxad_phy *phy = chan->phy; | |
496 | ||
497 | if (!phy) | |
498 | return false; | |
499 | dcsr = phy_readl_relaxed(phy, DCSR); | |
500 | return dcsr & PXA_DCSR_RUN; | |
501 | } | |
502 | ||
503 | static bool is_running_chan_misaligned(struct pxad_chan *chan) | |
504 | { | |
505 | u32 dalgn; | |
506 | ||
507 | BUG_ON(!chan->phy); | |
508 | dalgn = phy_readl_relaxed(chan->phy, DALGN); | |
509 | return dalgn & (BIT(chan->phy->idx)); | |
510 | } | |
511 | ||
512 | static void phy_enable(struct pxad_phy *phy, bool misaligned) | |
513 | { | |
6bab1c6a | 514 | struct pxad_device *pdev; |
a57e16cf RJ |
515 | u32 reg, dalgn; |
516 | ||
517 | if (!phy->vchan) | |
518 | return; | |
519 | ||
520 | dev_dbg(&phy->vchan->vc.chan.dev->device, | |
521 | "%s(); phy=%p(%d) misaligned=%d\n", __func__, | |
522 | phy, phy->idx, misaligned); | |
523 | ||
6bab1c6a RJ |
524 | pdev = to_pxad_dev(phy->vchan->vc.chan.device); |
525 | if (phy->vchan->drcmr <= pdev->nr_requestors) { | |
e87ffbdf RJ |
526 | reg = pxad_drcmr(phy->vchan->drcmr); |
527 | writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg); | |
528 | } | |
a57e16cf RJ |
529 | |
530 | dalgn = phy_readl_relaxed(phy, DALGN); | |
531 | if (misaligned) | |
532 | dalgn |= BIT(phy->idx); | |
533 | else | |
534 | dalgn &= ~BIT(phy->idx); | |
535 | phy_writel_relaxed(phy, dalgn, DALGN); | |
536 | ||
537 | phy_writel(phy, PXA_DCSR_STOPIRQEN | PXA_DCSR_ENDINTR | | |
538 | PXA_DCSR_BUSERR | PXA_DCSR_RUN, DCSR); | |
539 | } | |
540 | ||
541 | static void phy_disable(struct pxad_phy *phy) | |
542 | { | |
543 | u32 dcsr; | |
544 | ||
545 | if (!phy) | |
546 | return; | |
547 | ||
548 | dcsr = phy_readl_relaxed(phy, DCSR); | |
549 | dev_dbg(&phy->vchan->vc.chan.dev->device, | |
550 | "%s(): phy=%p(%d)\n", __func__, phy, phy->idx); | |
551 | phy_writel(phy, dcsr & ~PXA_DCSR_RUN & ~PXA_DCSR_STOPIRQEN, DCSR); | |
552 | } | |
553 | ||
554 | static void pxad_launch_chan(struct pxad_chan *chan, | |
555 | struct pxad_desc_sw *desc) | |
556 | { | |
557 | dev_dbg(&chan->vc.chan.dev->device, | |
558 | "%s(): desc=%p\n", __func__, desc); | |
559 | if (!chan->phy) { | |
560 | chan->phy = lookup_phy(chan); | |
561 | if (!chan->phy) { | |
562 | dev_dbg(&chan->vc.chan.dev->device, | |
563 | "%s(): no free dma channel\n", __func__); | |
564 | return; | |
565 | } | |
566 | } | |
e093bf60 | 567 | chan->bus_error = 0; |
a57e16cf RJ |
568 | |
569 | /* | |
570 | * Program the descriptor's address into the DMA controller, | |
571 | * then start the DMA transaction | |
572 | */ | |
573 | phy_writel(chan->phy, desc->first, DDADR); | |
574 | phy_enable(chan->phy, chan->misaligned); | |
575 | } | |
576 | ||
577 | static void set_updater_desc(struct pxad_desc_sw *sw_desc, | |
578 | unsigned long flags) | |
579 | { | |
580 | struct pxad_desc_hw *updater = | |
581 | sw_desc->hw_desc[sw_desc->nb_desc - 1]; | |
582 | dma_addr_t dma = sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr; | |
583 | ||
584 | updater->ddadr = DDADR_STOP; | |
585 | updater->dsadr = dma; | |
586 | updater->dtadr = dma + 8; | |
587 | updater->dcmd = PXA_DCMD_WIDTH4 | PXA_DCMD_BURST32 | | |
588 | (PXA_DCMD_LENGTH & sizeof(u32)); | |
589 | if (flags & DMA_PREP_INTERRUPT) | |
590 | updater->dcmd |= PXA_DCMD_ENDIRQEN; | |
f1692127 RJ |
591 | if (sw_desc->cyclic) |
592 | sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr = sw_desc->first; | |
a57e16cf RJ |
593 | } |
594 | ||
595 | static bool is_desc_completed(struct virt_dma_desc *vd) | |
596 | { | |
597 | struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd); | |
598 | struct pxad_desc_hw *updater = | |
599 | sw_desc->hw_desc[sw_desc->nb_desc - 1]; | |
600 | ||
601 | return updater->dtadr != (updater->dsadr + 8); | |
602 | } | |
603 | ||
604 | static void pxad_desc_chain(struct virt_dma_desc *vd1, | |
605 | struct virt_dma_desc *vd2) | |
606 | { | |
607 | struct pxad_desc_sw *desc1 = to_pxad_sw_desc(vd1); | |
608 | struct pxad_desc_sw *desc2 = to_pxad_sw_desc(vd2); | |
609 | dma_addr_t dma_to_chain; | |
610 | ||
611 | dma_to_chain = desc2->first; | |
612 | desc1->hw_desc[desc1->nb_desc - 1]->ddadr = dma_to_chain; | |
613 | } | |
614 | ||
615 | static bool pxad_try_hotchain(struct virt_dma_chan *vc, | |
616 | struct virt_dma_desc *vd) | |
617 | { | |
618 | struct virt_dma_desc *vd_last_issued = NULL; | |
619 | struct pxad_chan *chan = to_pxad_chan(&vc->chan); | |
620 | ||
621 | /* | |
622 | * Attempt to hot chain the tx if the phy is still running. This is | |
623 | * considered successful only if either the channel is still running | |
624 | * after the chaining, or if the chained transfer is completed after | |
625 | * having been hot chained. | |
626 | * A change of alignment is not allowed, and forbids hotchaining. | |
627 | */ | |
628 | if (is_chan_running(chan)) { | |
629 | BUG_ON(list_empty(&vc->desc_issued)); | |
630 | ||
631 | if (!is_running_chan_misaligned(chan) && | |
632 | to_pxad_sw_desc(vd)->misaligned) | |
633 | return false; | |
634 | ||
635 | vd_last_issued = list_entry(vc->desc_issued.prev, | |
636 | struct virt_dma_desc, node); | |
637 | pxad_desc_chain(vd_last_issued, vd); | |
638 | if (is_chan_running(chan) || is_desc_completed(vd_last_issued)) | |
639 | return true; | |
640 | } | |
641 | ||
642 | return false; | |
643 | } | |
644 | ||
645 | static unsigned int clear_chan_irq(struct pxad_phy *phy) | |
646 | { | |
647 | u32 dcsr; | |
648 | u32 dint = readl(phy->base + DINT); | |
649 | ||
650 | if (!(dint & BIT(phy->idx))) | |
651 | return PXA_DCSR_RUN; | |
652 | ||
653 | /* clear irq */ | |
654 | dcsr = phy_readl_relaxed(phy, DCSR); | |
655 | phy_writel(phy, dcsr, DCSR); | |
656 | if ((dcsr & PXA_DCSR_BUSERR) && (phy->vchan)) | |
657 | dev_warn(&phy->vchan->vc.chan.dev->device, | |
658 | "%s(chan=%p): PXA_DCSR_BUSERR\n", | |
659 | __func__, &phy->vchan); | |
660 | ||
661 | return dcsr & ~PXA_DCSR_RUN; | |
662 | } | |
663 | ||
664 | static irqreturn_t pxad_chan_handler(int irq, void *dev_id) | |
665 | { | |
666 | struct pxad_phy *phy = dev_id; | |
667 | struct pxad_chan *chan = phy->vchan; | |
668 | struct virt_dma_desc *vd, *tmp; | |
669 | unsigned int dcsr; | |
670 | unsigned long flags; | |
e093bf60 | 671 | dma_cookie_t last_started = 0; |
a57e16cf RJ |
672 | |
673 | BUG_ON(!chan); | |
674 | ||
675 | dcsr = clear_chan_irq(phy); | |
676 | if (dcsr & PXA_DCSR_RUN) | |
677 | return IRQ_NONE; | |
678 | ||
679 | spin_lock_irqsave(&chan->vc.lock, flags); | |
680 | list_for_each_entry_safe(vd, tmp, &chan->vc.desc_issued, node) { | |
681 | dev_dbg(&chan->vc.chan.dev->device, | |
682 | "%s(): checking txd %p[%x]: completed=%d\n", | |
683 | __func__, vd, vd->tx.cookie, is_desc_completed(vd)); | |
e093bf60 | 684 | last_started = vd->tx.cookie; |
f1692127 RJ |
685 | if (to_pxad_sw_desc(vd)->cyclic) { |
686 | vchan_cyclic_callback(vd); | |
687 | break; | |
688 | } | |
a57e16cf RJ |
689 | if (is_desc_completed(vd)) { |
690 | list_del(&vd->node); | |
691 | vchan_cookie_complete(vd); | |
692 | } else { | |
693 | break; | |
694 | } | |
695 | } | |
696 | ||
e093bf60 RJ |
697 | if (dcsr & PXA_DCSR_BUSERR) { |
698 | chan->bus_error = last_started; | |
699 | phy_disable(phy); | |
700 | } | |
701 | ||
702 | if (!chan->bus_error && dcsr & PXA_DCSR_STOPSTATE) { | |
a57e16cf RJ |
703 | dev_dbg(&chan->vc.chan.dev->device, |
704 | "%s(): channel stopped, submitted_empty=%d issued_empty=%d", | |
705 | __func__, | |
706 | list_empty(&chan->vc.desc_submitted), | |
707 | list_empty(&chan->vc.desc_issued)); | |
708 | phy_writel_relaxed(phy, dcsr & ~PXA_DCSR_STOPIRQEN, DCSR); | |
709 | ||
710 | if (list_empty(&chan->vc.desc_issued)) { | |
711 | chan->misaligned = | |
712 | !list_empty(&chan->vc.desc_submitted); | |
713 | } else { | |
714 | vd = list_first_entry(&chan->vc.desc_issued, | |
715 | struct virt_dma_desc, node); | |
716 | pxad_launch_chan(chan, to_pxad_sw_desc(vd)); | |
717 | } | |
718 | } | |
719 | spin_unlock_irqrestore(&chan->vc.lock, flags); | |
720 | ||
721 | return IRQ_HANDLED; | |
722 | } | |
723 | ||
724 | static irqreturn_t pxad_int_handler(int irq, void *dev_id) | |
725 | { | |
726 | struct pxad_device *pdev = dev_id; | |
727 | struct pxad_phy *phy; | |
728 | u32 dint = readl(pdev->base + DINT); | |
729 | int i, ret = IRQ_NONE; | |
730 | ||
731 | while (dint) { | |
732 | i = __ffs(dint); | |
733 | dint &= (dint - 1); | |
734 | phy = &pdev->phys[i]; | |
c91134d9 RJ |
735 | if ((i < 32) && (legacy_reserved & BIT(i))) |
736 | continue; | |
a57e16cf RJ |
737 | if (pxad_chan_handler(irq, phy) == IRQ_HANDLED) |
738 | ret = IRQ_HANDLED; | |
739 | } | |
740 | ||
741 | return ret; | |
742 | } | |
743 | ||
744 | static int pxad_alloc_chan_resources(struct dma_chan *dchan) | |
745 | { | |
746 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
747 | struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); | |
748 | ||
749 | if (chan->desc_pool) | |
750 | return 1; | |
751 | ||
752 | chan->desc_pool = dma_pool_create(dma_chan_name(dchan), | |
753 | pdev->slave.dev, | |
754 | sizeof(struct pxad_desc_hw), | |
755 | __alignof__(struct pxad_desc_hw), | |
756 | 0); | |
757 | if (!chan->desc_pool) { | |
758 | dev_err(&chan->vc.chan.dev->device, | |
759 | "%s(): unable to allocate descriptor pool\n", | |
760 | __func__); | |
761 | return -ENOMEM; | |
762 | } | |
763 | ||
764 | return 1; | |
765 | } | |
766 | ||
767 | static void pxad_free_chan_resources(struct dma_chan *dchan) | |
768 | { | |
769 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
770 | ||
771 | vchan_free_chan_resources(&chan->vc); | |
772 | dma_pool_destroy(chan->desc_pool); | |
773 | chan->desc_pool = NULL; | |
774 | ||
775 | } | |
776 | ||
777 | static void pxad_free_desc(struct virt_dma_desc *vd) | |
778 | { | |
779 | int i; | |
780 | dma_addr_t dma; | |
781 | struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd); | |
782 | ||
783 | BUG_ON(sw_desc->nb_desc == 0); | |
784 | for (i = sw_desc->nb_desc - 1; i >= 0; i--) { | |
785 | if (i > 0) | |
786 | dma = sw_desc->hw_desc[i - 1]->ddadr; | |
787 | else | |
788 | dma = sw_desc->first; | |
789 | dma_pool_free(sw_desc->desc_pool, | |
790 | sw_desc->hw_desc[i], dma); | |
791 | } | |
792 | sw_desc->nb_desc = 0; | |
793 | kfree(sw_desc); | |
794 | } | |
795 | ||
796 | static struct pxad_desc_sw * | |
797 | pxad_alloc_desc(struct pxad_chan *chan, unsigned int nb_hw_desc) | |
798 | { | |
799 | struct pxad_desc_sw *sw_desc; | |
800 | dma_addr_t dma; | |
801 | int i; | |
802 | ||
803 | sw_desc = kzalloc(sizeof(*sw_desc) + | |
804 | nb_hw_desc * sizeof(struct pxad_desc_hw *), | |
805 | GFP_NOWAIT); | |
806 | if (!sw_desc) | |
807 | return NULL; | |
808 | sw_desc->desc_pool = chan->desc_pool; | |
809 | ||
810 | for (i = 0; i < nb_hw_desc; i++) { | |
811 | sw_desc->hw_desc[i] = dma_pool_alloc(sw_desc->desc_pool, | |
812 | GFP_NOWAIT, &dma); | |
813 | if (!sw_desc->hw_desc[i]) { | |
814 | dev_err(&chan->vc.chan.dev->device, | |
815 | "%s(): Couldn't allocate the %dth hw_desc from dma_pool %p\n", | |
816 | __func__, i, sw_desc->desc_pool); | |
817 | goto err; | |
818 | } | |
819 | ||
820 | if (i == 0) | |
821 | sw_desc->first = dma; | |
822 | else | |
823 | sw_desc->hw_desc[i - 1]->ddadr = dma; | |
824 | sw_desc->nb_desc++; | |
825 | } | |
826 | ||
827 | return sw_desc; | |
828 | err: | |
829 | pxad_free_desc(&sw_desc->vd); | |
830 | return NULL; | |
831 | } | |
832 | ||
833 | static dma_cookie_t pxad_tx_submit(struct dma_async_tx_descriptor *tx) | |
834 | { | |
835 | struct virt_dma_chan *vc = to_virt_chan(tx->chan); | |
836 | struct pxad_chan *chan = to_pxad_chan(&vc->chan); | |
837 | struct virt_dma_desc *vd_chained = NULL, | |
838 | *vd = container_of(tx, struct virt_dma_desc, tx); | |
839 | dma_cookie_t cookie; | |
840 | unsigned long flags; | |
841 | ||
842 | set_updater_desc(to_pxad_sw_desc(vd), tx->flags); | |
843 | ||
844 | spin_lock_irqsave(&vc->lock, flags); | |
845 | cookie = dma_cookie_assign(tx); | |
846 | ||
847 | if (list_empty(&vc->desc_submitted) && pxad_try_hotchain(vc, vd)) { | |
848 | list_move_tail(&vd->node, &vc->desc_issued); | |
849 | dev_dbg(&chan->vc.chan.dev->device, | |
850 | "%s(): txd %p[%x]: submitted (hot linked)\n", | |
851 | __func__, vd, cookie); | |
852 | goto out; | |
853 | } | |
854 | ||
855 | /* | |
856 | * Fallback to placing the tx in the submitted queue | |
857 | */ | |
858 | if (!list_empty(&vc->desc_submitted)) { | |
859 | vd_chained = list_entry(vc->desc_submitted.prev, | |
860 | struct virt_dma_desc, node); | |
861 | /* | |
862 | * Only chain the descriptors if no new misalignment is | |
863 | * introduced. If a new misalignment is chained, let the channel | |
864 | * stop, and be relaunched in misalign mode from the irq | |
865 | * handler. | |
866 | */ | |
867 | if (chan->misaligned || !to_pxad_sw_desc(vd)->misaligned) | |
868 | pxad_desc_chain(vd_chained, vd); | |
869 | else | |
870 | vd_chained = NULL; | |
871 | } | |
872 | dev_dbg(&chan->vc.chan.dev->device, | |
873 | "%s(): txd %p[%x]: submitted (%s linked)\n", | |
874 | __func__, vd, cookie, vd_chained ? "cold" : "not"); | |
875 | list_move_tail(&vd->node, &vc->desc_submitted); | |
876 | chan->misaligned |= to_pxad_sw_desc(vd)->misaligned; | |
877 | ||
878 | out: | |
879 | spin_unlock_irqrestore(&vc->lock, flags); | |
880 | return cookie; | |
881 | } | |
882 | ||
883 | static void pxad_issue_pending(struct dma_chan *dchan) | |
884 | { | |
885 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
886 | struct virt_dma_desc *vd_first; | |
887 | unsigned long flags; | |
888 | ||
889 | spin_lock_irqsave(&chan->vc.lock, flags); | |
890 | if (list_empty(&chan->vc.desc_submitted)) | |
891 | goto out; | |
892 | ||
893 | vd_first = list_first_entry(&chan->vc.desc_submitted, | |
894 | struct virt_dma_desc, node); | |
895 | dev_dbg(&chan->vc.chan.dev->device, | |
896 | "%s(): txd %p[%x]", __func__, vd_first, vd_first->tx.cookie); | |
897 | ||
898 | vchan_issue_pending(&chan->vc); | |
899 | if (!pxad_try_hotchain(&chan->vc, vd_first)) | |
900 | pxad_launch_chan(chan, to_pxad_sw_desc(vd_first)); | |
901 | out: | |
902 | spin_unlock_irqrestore(&chan->vc.lock, flags); | |
903 | } | |
904 | ||
905 | static inline struct dma_async_tx_descriptor * | |
906 | pxad_tx_prep(struct virt_dma_chan *vc, struct virt_dma_desc *vd, | |
907 | unsigned long tx_flags) | |
908 | { | |
909 | struct dma_async_tx_descriptor *tx; | |
910 | struct pxad_chan *chan = container_of(vc, struct pxad_chan, vc); | |
911 | ||
aebf5a67 | 912 | INIT_LIST_HEAD(&vd->node); |
a57e16cf RJ |
913 | tx = vchan_tx_prep(vc, vd, tx_flags); |
914 | tx->tx_submit = pxad_tx_submit; | |
915 | dev_dbg(&chan->vc.chan.dev->device, | |
916 | "%s(): vc=%p txd=%p[%x] flags=0x%lx\n", __func__, | |
917 | vc, vd, vd->tx.cookie, | |
918 | tx_flags); | |
919 | ||
920 | return tx; | |
921 | } | |
922 | ||
923 | static void pxad_get_config(struct pxad_chan *chan, | |
924 | enum dma_transfer_direction dir, | |
925 | u32 *dcmd, u32 *dev_src, u32 *dev_dst) | |
926 | { | |
927 | u32 maxburst = 0, dev_addr = 0; | |
928 | enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED; | |
6bab1c6a | 929 | struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); |
a57e16cf RJ |
930 | |
931 | *dcmd = 0; | |
0e95fb9c | 932 | if (dir == DMA_DEV_TO_MEM) { |
a57e16cf RJ |
933 | maxburst = chan->cfg.src_maxburst; |
934 | width = chan->cfg.src_addr_width; | |
935 | dev_addr = chan->cfg.src_addr; | |
936 | *dev_src = dev_addr; | |
e87ffbdf | 937 | *dcmd |= PXA_DCMD_INCTRGADDR; |
6bab1c6a | 938 | if (chan->drcmr <= pdev->nr_requestors) |
e87ffbdf | 939 | *dcmd |= PXA_DCMD_FLOWSRC; |
a57e16cf | 940 | } |
0e95fb9c | 941 | if (dir == DMA_MEM_TO_DEV) { |
a57e16cf RJ |
942 | maxburst = chan->cfg.dst_maxburst; |
943 | width = chan->cfg.dst_addr_width; | |
944 | dev_addr = chan->cfg.dst_addr; | |
945 | *dev_dst = dev_addr; | |
e87ffbdf | 946 | *dcmd |= PXA_DCMD_INCSRCADDR; |
6bab1c6a | 947 | if (chan->drcmr <= pdev->nr_requestors) |
e87ffbdf | 948 | *dcmd |= PXA_DCMD_FLOWTRG; |
a57e16cf | 949 | } |
0e95fb9c | 950 | if (dir == DMA_MEM_TO_MEM) |
a57e16cf RJ |
951 | *dcmd |= PXA_DCMD_BURST32 | PXA_DCMD_INCTRGADDR | |
952 | PXA_DCMD_INCSRCADDR; | |
953 | ||
954 | dev_dbg(&chan->vc.chan.dev->device, | |
955 | "%s(): dev_addr=0x%x maxburst=%d width=%d dir=%d\n", | |
956 | __func__, dev_addr, maxburst, width, dir); | |
957 | ||
958 | if (width == DMA_SLAVE_BUSWIDTH_1_BYTE) | |
959 | *dcmd |= PXA_DCMD_WIDTH1; | |
960 | else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES) | |
961 | *dcmd |= PXA_DCMD_WIDTH2; | |
962 | else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES) | |
963 | *dcmd |= PXA_DCMD_WIDTH4; | |
964 | ||
965 | if (maxburst == 8) | |
966 | *dcmd |= PXA_DCMD_BURST8; | |
967 | else if (maxburst == 16) | |
968 | *dcmd |= PXA_DCMD_BURST16; | |
969 | else if (maxburst == 32) | |
970 | *dcmd |= PXA_DCMD_BURST32; | |
971 | ||
972 | /* FIXME: drivers should be ported over to use the filter | |
973 | * function. Once that's done, the following two lines can | |
974 | * be removed. | |
975 | */ | |
976 | if (chan->cfg.slave_id) | |
977 | chan->drcmr = chan->cfg.slave_id; | |
978 | } | |
979 | ||
980 | static struct dma_async_tx_descriptor * | |
981 | pxad_prep_memcpy(struct dma_chan *dchan, | |
982 | dma_addr_t dma_dst, dma_addr_t dma_src, | |
983 | size_t len, unsigned long flags) | |
984 | { | |
985 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
986 | struct pxad_desc_sw *sw_desc; | |
987 | struct pxad_desc_hw *hw_desc; | |
988 | u32 dcmd; | |
989 | unsigned int i, nb_desc = 0; | |
990 | size_t copy; | |
991 | ||
992 | if (!dchan || !len) | |
993 | return NULL; | |
994 | ||
995 | dev_dbg(&chan->vc.chan.dev->device, | |
996 | "%s(): dma_dst=0x%lx dma_src=0x%lx len=%zu flags=%lx\n", | |
997 | __func__, (unsigned long)dma_dst, (unsigned long)dma_src, | |
998 | len, flags); | |
999 | pxad_get_config(chan, DMA_MEM_TO_MEM, &dcmd, NULL, NULL); | |
1000 | ||
1001 | nb_desc = DIV_ROUND_UP(len, PDMA_MAX_DESC_BYTES); | |
1002 | sw_desc = pxad_alloc_desc(chan, nb_desc + 1); | |
1003 | if (!sw_desc) | |
1004 | return NULL; | |
1005 | sw_desc->len = len; | |
1006 | ||
1007 | if (!IS_ALIGNED(dma_src, 1 << PDMA_ALIGNMENT) || | |
1008 | !IS_ALIGNED(dma_dst, 1 << PDMA_ALIGNMENT)) | |
1009 | sw_desc->misaligned = true; | |
1010 | ||
1011 | i = 0; | |
1012 | do { | |
1013 | hw_desc = sw_desc->hw_desc[i++]; | |
1014 | copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES); | |
1015 | hw_desc->dcmd = dcmd | (PXA_DCMD_LENGTH & copy); | |
1016 | hw_desc->dsadr = dma_src; | |
1017 | hw_desc->dtadr = dma_dst; | |
1018 | len -= copy; | |
1019 | dma_src += copy; | |
1020 | dma_dst += copy; | |
1021 | } while (len); | |
1022 | set_updater_desc(sw_desc, flags); | |
1023 | ||
1024 | return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); | |
1025 | } | |
1026 | ||
1027 | static struct dma_async_tx_descriptor * | |
1028 | pxad_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, | |
1029 | unsigned int sg_len, enum dma_transfer_direction dir, | |
1030 | unsigned long flags, void *context) | |
1031 | { | |
1032 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1033 | struct pxad_desc_sw *sw_desc; | |
1034 | size_t len, avail; | |
1035 | struct scatterlist *sg; | |
1036 | dma_addr_t dma; | |
1037 | u32 dcmd, dsadr = 0, dtadr = 0; | |
1038 | unsigned int nb_desc = 0, i, j = 0; | |
1039 | ||
1040 | if ((sgl == NULL) || (sg_len == 0)) | |
1041 | return NULL; | |
1042 | ||
1043 | pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr); | |
1044 | dev_dbg(&chan->vc.chan.dev->device, | |
1045 | "%s(): dir=%d flags=%lx\n", __func__, dir, flags); | |
1046 | ||
1047 | for_each_sg(sgl, sg, sg_len, i) | |
1048 | nb_desc += DIV_ROUND_UP(sg_dma_len(sg), PDMA_MAX_DESC_BYTES); | |
1049 | sw_desc = pxad_alloc_desc(chan, nb_desc + 1); | |
1050 | if (!sw_desc) | |
1051 | return NULL; | |
1052 | ||
1053 | for_each_sg(sgl, sg, sg_len, i) { | |
1054 | dma = sg_dma_address(sg); | |
1055 | avail = sg_dma_len(sg); | |
1056 | sw_desc->len += avail; | |
1057 | ||
1058 | do { | |
1059 | len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES); | |
1060 | if (dma & 0x7) | |
1061 | sw_desc->misaligned = true; | |
1062 | ||
1063 | sw_desc->hw_desc[j]->dcmd = | |
1064 | dcmd | (PXA_DCMD_LENGTH & len); | |
1065 | sw_desc->hw_desc[j]->dsadr = dsadr ? dsadr : dma; | |
1066 | sw_desc->hw_desc[j++]->dtadr = dtadr ? dtadr : dma; | |
1067 | ||
1068 | dma += len; | |
1069 | avail -= len; | |
1070 | } while (avail); | |
1071 | } | |
1072 | set_updater_desc(sw_desc, flags); | |
1073 | ||
1074 | return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); | |
1075 | } | |
1076 | ||
1077 | static struct dma_async_tx_descriptor * | |
1078 | pxad_prep_dma_cyclic(struct dma_chan *dchan, | |
1079 | dma_addr_t buf_addr, size_t len, size_t period_len, | |
1080 | enum dma_transfer_direction dir, unsigned long flags) | |
1081 | { | |
1082 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1083 | struct pxad_desc_sw *sw_desc; | |
1084 | struct pxad_desc_hw **phw_desc; | |
1085 | dma_addr_t dma; | |
1086 | u32 dcmd, dsadr = 0, dtadr = 0; | |
1087 | unsigned int nb_desc = 0; | |
1088 | ||
1089 | if (!dchan || !len || !period_len) | |
1090 | return NULL; | |
1091 | if ((dir != DMA_DEV_TO_MEM) && (dir != DMA_MEM_TO_DEV)) { | |
1092 | dev_err(&chan->vc.chan.dev->device, | |
1093 | "Unsupported direction for cyclic DMA\n"); | |
1094 | return NULL; | |
1095 | } | |
1096 | /* the buffer length must be a multiple of period_len */ | |
1097 | if (len % period_len != 0 || period_len > PDMA_MAX_DESC_BYTES || | |
1098 | !IS_ALIGNED(period_len, 1 << PDMA_ALIGNMENT)) | |
1099 | return NULL; | |
1100 | ||
1101 | pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr); | |
f1692127 | 1102 | dcmd |= PXA_DCMD_ENDIRQEN | (PXA_DCMD_LENGTH & period_len); |
a57e16cf RJ |
1103 | dev_dbg(&chan->vc.chan.dev->device, |
1104 | "%s(): buf_addr=0x%lx len=%zu period=%zu dir=%d flags=%lx\n", | |
1105 | __func__, (unsigned long)buf_addr, len, period_len, dir, flags); | |
1106 | ||
1107 | nb_desc = DIV_ROUND_UP(period_len, PDMA_MAX_DESC_BYTES); | |
1108 | nb_desc *= DIV_ROUND_UP(len, period_len); | |
1109 | sw_desc = pxad_alloc_desc(chan, nb_desc + 1); | |
1110 | if (!sw_desc) | |
1111 | return NULL; | |
1112 | sw_desc->cyclic = true; | |
1113 | sw_desc->len = len; | |
1114 | ||
1115 | phw_desc = sw_desc->hw_desc; | |
1116 | dma = buf_addr; | |
1117 | do { | |
1118 | phw_desc[0]->dsadr = dsadr ? dsadr : dma; | |
1119 | phw_desc[0]->dtadr = dtadr ? dtadr : dma; | |
1120 | phw_desc[0]->dcmd = dcmd; | |
1121 | phw_desc++; | |
1122 | dma += period_len; | |
1123 | len -= period_len; | |
1124 | } while (len); | |
1125 | set_updater_desc(sw_desc, flags); | |
1126 | ||
1127 | return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags); | |
1128 | } | |
1129 | ||
1130 | static int pxad_config(struct dma_chan *dchan, | |
1131 | struct dma_slave_config *cfg) | |
1132 | { | |
1133 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1134 | ||
1135 | if (!dchan) | |
1136 | return -EINVAL; | |
1137 | ||
1138 | chan->cfg = *cfg; | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | static int pxad_terminate_all(struct dma_chan *dchan) | |
1143 | { | |
1144 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1145 | struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device); | |
1146 | struct virt_dma_desc *vd = NULL; | |
1147 | unsigned long flags; | |
1148 | struct pxad_phy *phy; | |
1149 | LIST_HEAD(head); | |
1150 | ||
1151 | dev_dbg(&chan->vc.chan.dev->device, | |
1152 | "%s(): vchan %p: terminate all\n", __func__, &chan->vc); | |
1153 | ||
1154 | spin_lock_irqsave(&chan->vc.lock, flags); | |
1155 | vchan_get_all_descriptors(&chan->vc, &head); | |
1156 | ||
1157 | list_for_each_entry(vd, &head, node) { | |
1158 | dev_dbg(&chan->vc.chan.dev->device, | |
1159 | "%s(): cancelling txd %p[%x] (completed=%d)", __func__, | |
1160 | vd, vd->tx.cookie, is_desc_completed(vd)); | |
1161 | } | |
1162 | ||
1163 | phy = chan->phy; | |
1164 | if (phy) { | |
1165 | phy_disable(chan->phy); | |
1166 | pxad_free_phy(chan); | |
1167 | chan->phy = NULL; | |
1168 | spin_lock(&pdev->phy_lock); | |
1169 | phy->vchan = NULL; | |
1170 | spin_unlock(&pdev->phy_lock); | |
1171 | } | |
1172 | spin_unlock_irqrestore(&chan->vc.lock, flags); | |
1173 | vchan_dma_desc_free_list(&chan->vc, &head); | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | static unsigned int pxad_residue(struct pxad_chan *chan, | |
1179 | dma_cookie_t cookie) | |
1180 | { | |
1181 | struct virt_dma_desc *vd = NULL; | |
1182 | struct pxad_desc_sw *sw_desc = NULL; | |
1183 | struct pxad_desc_hw *hw_desc = NULL; | |
1184 | u32 curr, start, len, end, residue = 0; | |
1185 | unsigned long flags; | |
1186 | bool passed = false; | |
1187 | int i; | |
1188 | ||
1189 | /* | |
1190 | * If the channel does not have a phy pointer anymore, it has already | |
1191 | * been completed. Therefore, its residue is 0. | |
1192 | */ | |
1193 | if (!chan->phy) | |
1194 | return 0; | |
1195 | ||
1196 | spin_lock_irqsave(&chan->vc.lock, flags); | |
1197 | ||
1198 | vd = vchan_find_desc(&chan->vc, cookie); | |
1199 | if (!vd) | |
1200 | goto out; | |
1201 | ||
1202 | sw_desc = to_pxad_sw_desc(vd); | |
1203 | if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR) | |
1204 | curr = phy_readl_relaxed(chan->phy, DSADR); | |
1205 | else | |
1206 | curr = phy_readl_relaxed(chan->phy, DTADR); | |
1207 | ||
7b09a1bb RJ |
1208 | /* |
1209 | * curr has to be actually read before checking descriptor | |
1210 | * completion, so that a curr inside a status updater | |
1211 | * descriptor implies the following test returns true, and | |
1212 | * preventing reordering of curr load and the test. | |
1213 | */ | |
1214 | rmb(); | |
1215 | if (is_desc_completed(vd)) | |
1216 | goto out; | |
1217 | ||
a57e16cf RJ |
1218 | for (i = 0; i < sw_desc->nb_desc - 1; i++) { |
1219 | hw_desc = sw_desc->hw_desc[i]; | |
1220 | if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR) | |
1221 | start = hw_desc->dsadr; | |
1222 | else | |
1223 | start = hw_desc->dtadr; | |
1224 | len = hw_desc->dcmd & PXA_DCMD_LENGTH; | |
1225 | end = start + len; | |
1226 | ||
1227 | /* | |
1228 | * 'passed' will be latched once we found the descriptor | |
1229 | * which lies inside the boundaries of the curr | |
1230 | * pointer. All descriptors that occur in the list | |
1231 | * _after_ we found that partially handled descriptor | |
1232 | * are still to be processed and are hence added to the | |
1233 | * residual bytes counter. | |
1234 | */ | |
1235 | ||
1236 | if (passed) { | |
1237 | residue += len; | |
1238 | } else if (curr >= start && curr <= end) { | |
1239 | residue += end - curr; | |
1240 | passed = true; | |
1241 | } | |
1242 | } | |
1243 | if (!passed) | |
1244 | residue = sw_desc->len; | |
1245 | ||
1246 | out: | |
1247 | spin_unlock_irqrestore(&chan->vc.lock, flags); | |
1248 | dev_dbg(&chan->vc.chan.dev->device, | |
1249 | "%s(): txd %p[%x] sw_desc=%p: %d\n", | |
1250 | __func__, vd, cookie, sw_desc, residue); | |
1251 | return residue; | |
1252 | } | |
1253 | ||
1254 | static enum dma_status pxad_tx_status(struct dma_chan *dchan, | |
1255 | dma_cookie_t cookie, | |
1256 | struct dma_tx_state *txstate) | |
1257 | { | |
1258 | struct pxad_chan *chan = to_pxad_chan(dchan); | |
1259 | enum dma_status ret; | |
1260 | ||
e093bf60 RJ |
1261 | if (cookie == chan->bus_error) |
1262 | return DMA_ERROR; | |
1263 | ||
a57e16cf RJ |
1264 | ret = dma_cookie_status(dchan, cookie, txstate); |
1265 | if (likely(txstate && (ret != DMA_ERROR))) | |
1266 | dma_set_residue(txstate, pxad_residue(chan, cookie)); | |
1267 | ||
1268 | return ret; | |
1269 | } | |
1270 | ||
1271 | static void pxad_free_channels(struct dma_device *dmadev) | |
1272 | { | |
1273 | struct pxad_chan *c, *cn; | |
1274 | ||
1275 | list_for_each_entry_safe(c, cn, &dmadev->channels, | |
1276 | vc.chan.device_node) { | |
1277 | list_del(&c->vc.chan.device_node); | |
1278 | tasklet_kill(&c->vc.task); | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | static int pxad_remove(struct platform_device *op) | |
1283 | { | |
1284 | struct pxad_device *pdev = platform_get_drvdata(op); | |
1285 | ||
c01d1b51 | 1286 | pxad_cleanup_debugfs(pdev); |
a57e16cf RJ |
1287 | pxad_free_channels(&pdev->slave); |
1288 | dma_async_device_unregister(&pdev->slave); | |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | static int pxad_init_phys(struct platform_device *op, | |
1293 | struct pxad_device *pdev, | |
1294 | unsigned int nb_phy_chans) | |
1295 | { | |
1296 | int irq0, irq, nr_irq = 0, i, ret; | |
1297 | struct pxad_phy *phy; | |
1298 | ||
1299 | irq0 = platform_get_irq(op, 0); | |
1300 | if (irq0 < 0) | |
1301 | return irq0; | |
1302 | ||
1303 | pdev->phys = devm_kcalloc(&op->dev, nb_phy_chans, | |
1304 | sizeof(pdev->phys[0]), GFP_KERNEL); | |
1305 | if (!pdev->phys) | |
1306 | return -ENOMEM; | |
1307 | ||
1308 | for (i = 0; i < nb_phy_chans; i++) | |
1309 | if (platform_get_irq(op, i) > 0) | |
1310 | nr_irq++; | |
1311 | ||
1312 | for (i = 0; i < nb_phy_chans; i++) { | |
1313 | phy = &pdev->phys[i]; | |
1314 | phy->base = pdev->base; | |
1315 | phy->idx = i; | |
1316 | irq = platform_get_irq(op, i); | |
1317 | if ((nr_irq > 1) && (irq > 0)) | |
1318 | ret = devm_request_irq(&op->dev, irq, | |
1319 | pxad_chan_handler, | |
1320 | IRQF_SHARED, "pxa-dma", phy); | |
1321 | if ((nr_irq == 1) && (i == 0)) | |
1322 | ret = devm_request_irq(&op->dev, irq0, | |
1323 | pxad_int_handler, | |
1324 | IRQF_SHARED, "pxa-dma", pdev); | |
1325 | if (ret) { | |
1326 | dev_err(pdev->slave.dev, | |
1327 | "%s(): can't request irq %d:%d\n", __func__, | |
1328 | irq, ret); | |
1329 | return ret; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | return 0; | |
1334 | } | |
1335 | ||
4e0def88 | 1336 | static const struct of_device_id pxad_dt_ids[] = { |
a57e16cf RJ |
1337 | { .compatible = "marvell,pdma-1.0", }, |
1338 | {} | |
1339 | }; | |
1340 | MODULE_DEVICE_TABLE(of, pxad_dt_ids); | |
1341 | ||
1342 | static struct dma_chan *pxad_dma_xlate(struct of_phandle_args *dma_spec, | |
1343 | struct of_dma *ofdma) | |
1344 | { | |
1345 | struct pxad_device *d = ofdma->of_dma_data; | |
1346 | struct dma_chan *chan; | |
1347 | ||
1348 | chan = dma_get_any_slave_channel(&d->slave); | |
1349 | if (!chan) | |
1350 | return NULL; | |
1351 | ||
1352 | to_pxad_chan(chan)->drcmr = dma_spec->args[0]; | |
1353 | to_pxad_chan(chan)->prio = dma_spec->args[1]; | |
1354 | ||
1355 | return chan; | |
1356 | } | |
1357 | ||
1358 | static int pxad_init_dmadev(struct platform_device *op, | |
1359 | struct pxad_device *pdev, | |
6bab1c6a RJ |
1360 | unsigned int nr_phy_chans, |
1361 | unsigned int nr_requestors) | |
a57e16cf RJ |
1362 | { |
1363 | int ret; | |
1364 | unsigned int i; | |
1365 | struct pxad_chan *c; | |
1366 | ||
1367 | pdev->nr_chans = nr_phy_chans; | |
6bab1c6a | 1368 | pdev->nr_requestors = nr_requestors; |
a57e16cf RJ |
1369 | INIT_LIST_HEAD(&pdev->slave.channels); |
1370 | pdev->slave.device_alloc_chan_resources = pxad_alloc_chan_resources; | |
1371 | pdev->slave.device_free_chan_resources = pxad_free_chan_resources; | |
1372 | pdev->slave.device_tx_status = pxad_tx_status; | |
1373 | pdev->slave.device_issue_pending = pxad_issue_pending; | |
1374 | pdev->slave.device_config = pxad_config; | |
1375 | pdev->slave.device_terminate_all = pxad_terminate_all; | |
1376 | ||
1377 | if (op->dev.coherent_dma_mask) | |
1378 | dma_set_mask(&op->dev, op->dev.coherent_dma_mask); | |
1379 | else | |
1380 | dma_set_mask(&op->dev, DMA_BIT_MASK(32)); | |
1381 | ||
1382 | ret = pxad_init_phys(op, pdev, nr_phy_chans); | |
1383 | if (ret) | |
1384 | return ret; | |
1385 | ||
1386 | for (i = 0; i < nr_phy_chans; i++) { | |
1387 | c = devm_kzalloc(&op->dev, sizeof(*c), GFP_KERNEL); | |
1388 | if (!c) | |
1389 | return -ENOMEM; | |
1390 | c->vc.desc_free = pxad_free_desc; | |
1391 | vchan_init(&c->vc, &pdev->slave); | |
1392 | } | |
1393 | ||
1394 | return dma_async_device_register(&pdev->slave); | |
1395 | } | |
1396 | ||
1397 | static int pxad_probe(struct platform_device *op) | |
1398 | { | |
1399 | struct pxad_device *pdev; | |
1400 | const struct of_device_id *of_id; | |
1401 | struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev); | |
1402 | struct resource *iores; | |
6bab1c6a | 1403 | int ret, dma_channels = 0, nb_requestors = 0; |
a57e16cf RJ |
1404 | const enum dma_slave_buswidth widths = |
1405 | DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES | | |
1406 | DMA_SLAVE_BUSWIDTH_4_BYTES; | |
1407 | ||
1408 | pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL); | |
1409 | if (!pdev) | |
1410 | return -ENOMEM; | |
1411 | ||
1412 | spin_lock_init(&pdev->phy_lock); | |
1413 | ||
1414 | iores = platform_get_resource(op, IORESOURCE_MEM, 0); | |
1415 | pdev->base = devm_ioremap_resource(&op->dev, iores); | |
1416 | if (IS_ERR(pdev->base)) | |
1417 | return PTR_ERR(pdev->base); | |
1418 | ||
1419 | of_id = of_match_device(pxad_dt_ids, &op->dev); | |
6bab1c6a | 1420 | if (of_id) { |
a57e16cf RJ |
1421 | of_property_read_u32(op->dev.of_node, "#dma-channels", |
1422 | &dma_channels); | |
6bab1c6a RJ |
1423 | ret = of_property_read_u32(op->dev.of_node, "#dma-requests", |
1424 | &nb_requestors); | |
1425 | if (ret) { | |
1426 | dev_warn(pdev->slave.dev, | |
1427 | "#dma-requests set to default 32 as missing in OF: %d", | |
1428 | ret); | |
1429 | nb_requestors = 32; | |
1430 | }; | |
1431 | } else if (pdata && pdata->dma_channels) { | |
a57e16cf | 1432 | dma_channels = pdata->dma_channels; |
6bab1c6a RJ |
1433 | nb_requestors = pdata->nb_requestors; |
1434 | } else { | |
a57e16cf | 1435 | dma_channels = 32; /* default 32 channel */ |
6bab1c6a | 1436 | } |
a57e16cf RJ |
1437 | |
1438 | dma_cap_set(DMA_SLAVE, pdev->slave.cap_mask); | |
1439 | dma_cap_set(DMA_MEMCPY, pdev->slave.cap_mask); | |
1440 | dma_cap_set(DMA_CYCLIC, pdev->slave.cap_mask); | |
1441 | dma_cap_set(DMA_PRIVATE, pdev->slave.cap_mask); | |
1442 | pdev->slave.device_prep_dma_memcpy = pxad_prep_memcpy; | |
1443 | pdev->slave.device_prep_slave_sg = pxad_prep_slave_sg; | |
1444 | pdev->slave.device_prep_dma_cyclic = pxad_prep_dma_cyclic; | |
1445 | ||
1446 | pdev->slave.copy_align = PDMA_ALIGNMENT; | |
1447 | pdev->slave.src_addr_widths = widths; | |
1448 | pdev->slave.dst_addr_widths = widths; | |
1449 | pdev->slave.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); | |
1450 | pdev->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; | |
d3651b8e | 1451 | pdev->slave.descriptor_reuse = true; |
a57e16cf RJ |
1452 | |
1453 | pdev->slave.dev = &op->dev; | |
6bab1c6a | 1454 | ret = pxad_init_dmadev(op, pdev, dma_channels, nb_requestors); |
a57e16cf RJ |
1455 | if (ret) { |
1456 | dev_err(pdev->slave.dev, "unable to register\n"); | |
1457 | return ret; | |
1458 | } | |
1459 | ||
1460 | if (op->dev.of_node) { | |
1461 | /* Device-tree DMA controller registration */ | |
1462 | ret = of_dma_controller_register(op->dev.of_node, | |
1463 | pxad_dma_xlate, pdev); | |
1464 | if (ret < 0) { | |
1465 | dev_err(pdev->slave.dev, | |
1466 | "of_dma_controller_register failed\n"); | |
1467 | return ret; | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | platform_set_drvdata(op, pdev); | |
c01d1b51 | 1472 | pxad_init_debugfs(pdev); |
6bab1c6a RJ |
1473 | dev_info(pdev->slave.dev, "initialized %d channels on %d requestors\n", |
1474 | dma_channels, nb_requestors); | |
a57e16cf RJ |
1475 | return 0; |
1476 | } | |
1477 | ||
1478 | static const struct platform_device_id pxad_id_table[] = { | |
1479 | { "pxa-dma", }, | |
1480 | { }, | |
1481 | }; | |
1482 | ||
1483 | static struct platform_driver pxad_driver = { | |
1484 | .driver = { | |
1485 | .name = "pxa-dma", | |
1486 | .of_match_table = pxad_dt_ids, | |
1487 | }, | |
1488 | .id_table = pxad_id_table, | |
1489 | .probe = pxad_probe, | |
1490 | .remove = pxad_remove, | |
1491 | }; | |
1492 | ||
1493 | bool pxad_filter_fn(struct dma_chan *chan, void *param) | |
1494 | { | |
1495 | struct pxad_chan *c = to_pxad_chan(chan); | |
1496 | struct pxad_param *p = param; | |
1497 | ||
1498 | if (chan->device->dev->driver != &pxad_driver.driver) | |
1499 | return false; | |
1500 | ||
1501 | c->drcmr = p->drcmr; | |
1502 | c->prio = p->prio; | |
1503 | ||
1504 | return true; | |
1505 | } | |
1506 | EXPORT_SYMBOL_GPL(pxad_filter_fn); | |
1507 | ||
c91134d9 RJ |
1508 | int pxad_toggle_reserved_channel(int legacy_channel) |
1509 | { | |
1510 | if (legacy_unavailable & (BIT(legacy_channel))) | |
1511 | return -EBUSY; | |
1512 | legacy_reserved ^= BIT(legacy_channel); | |
1513 | return 0; | |
1514 | } | |
1515 | EXPORT_SYMBOL_GPL(pxad_toggle_reserved_channel); | |
1516 | ||
a57e16cf RJ |
1517 | module_platform_driver(pxad_driver); |
1518 | ||
1519 | MODULE_DESCRIPTION("Marvell PXA Peripheral DMA Driver"); | |
1520 | MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>"); | |
1521 | MODULE_LICENSE("GPL v2"); |