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550a7375 FB |
1 | /* |
2 | * TUSB6010 USB 2.0 OTG Dual Role controller OMAP DMA interface | |
3 | * | |
4 | * Copyright (C) 2006 Nokia Corporation | |
5 | * Tony Lindgren <tony@atomide.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/usb.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/dma-mapping.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
45c3eb7d | 19 | #include <linux/omap-dma.h> |
550a7375 FB |
20 | |
21 | #include "musb_core.h" | |
240a16e2 | 22 | #include "tusb6010.h" |
550a7375 FB |
23 | |
24 | #define to_chdat(c) ((struct tusb_omap_dma_ch *)(c)->private_data) | |
25 | ||
26 | #define MAX_DMAREQ 5 /* REVISIT: Really 6, but req5 not OK */ | |
27 | ||
d5e7c864 LV |
28 | #define OMAP24XX_DMA_EXT_DMAREQ0 2 |
29 | #define OMAP24XX_DMA_EXT_DMAREQ1 3 | |
30 | #define OMAP242X_DMA_EXT_DMAREQ2 14 | |
31 | #define OMAP242X_DMA_EXT_DMAREQ3 15 | |
32 | #define OMAP242X_DMA_EXT_DMAREQ4 16 | |
33 | #define OMAP242X_DMA_EXT_DMAREQ5 64 | |
34 | ||
550a7375 FB |
35 | struct tusb_omap_dma_ch { |
36 | struct musb *musb; | |
37 | void __iomem *tbase; | |
38 | unsigned long phys_offset; | |
39 | int epnum; | |
40 | u8 tx; | |
41 | struct musb_hw_ep *hw_ep; | |
42 | ||
43 | int ch; | |
44 | s8 dmareq; | |
45 | s8 sync_dev; | |
46 | ||
47 | struct tusb_omap_dma *tusb_dma; | |
48 | ||
1d0f11b3 | 49 | dma_addr_t dma_addr; |
550a7375 FB |
50 | |
51 | u32 len; | |
52 | u16 packet_sz; | |
53 | u16 transfer_packet_sz; | |
54 | u32 transfer_len; | |
55 | u32 completed_len; | |
56 | }; | |
57 | ||
58 | struct tusb_omap_dma { | |
59 | struct dma_controller controller; | |
60 | struct musb *musb; | |
61 | void __iomem *tbase; | |
62 | ||
63 | int ch; | |
64 | s8 dmareq; | |
65 | s8 sync_dev; | |
66 | unsigned multichannel:1; | |
67 | }; | |
68 | ||
69 | static int tusb_omap_dma_start(struct dma_controller *c) | |
70 | { | |
71 | struct tusb_omap_dma *tusb_dma; | |
72 | ||
73 | tusb_dma = container_of(c, struct tusb_omap_dma, controller); | |
74 | ||
5c8a86e1 | 75 | /* dev_dbg(musb->controller, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */ |
550a7375 FB |
76 | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static int tusb_omap_dma_stop(struct dma_controller *c) | |
81 | { | |
82 | struct tusb_omap_dma *tusb_dma; | |
83 | ||
84 | tusb_dma = container_of(c, struct tusb_omap_dma, controller); | |
85 | ||
5c8a86e1 | 86 | /* dev_dbg(musb->controller, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */ |
550a7375 FB |
87 | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* | |
92 | * Allocate dmareq0 to the current channel unless it's already taken | |
93 | */ | |
94 | static inline int tusb_omap_use_shared_dmareq(struct tusb_omap_dma_ch *chdat) | |
95 | { | |
96 | u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP); | |
97 | ||
98 | if (reg != 0) { | |
74c6f3a4 | 99 | dev_dbg(chdat->musb->controller, "ep%i dmareq0 is busy for ep%i\n", |
550a7375 FB |
100 | chdat->epnum, reg & 0xf); |
101 | return -EAGAIN; | |
102 | } | |
103 | ||
104 | if (chdat->tx) | |
105 | reg = (1 << 4) | chdat->epnum; | |
106 | else | |
107 | reg = chdat->epnum; | |
108 | ||
109 | musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg); | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static inline void tusb_omap_free_shared_dmareq(struct tusb_omap_dma_ch *chdat) | |
115 | { | |
116 | u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP); | |
117 | ||
118 | if ((reg & 0xf) != chdat->epnum) { | |
119 | printk(KERN_ERR "ep%i trying to release dmareq0 for ep%i\n", | |
120 | chdat->epnum, reg & 0xf); | |
121 | return; | |
122 | } | |
123 | musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, 0); | |
124 | } | |
125 | ||
126 | /* | |
127 | * See also musb_dma_completion in plat_uds.c and musb_g_[tx|rx]() in | |
128 | * musb_gadget.c. | |
129 | */ | |
130 | static void tusb_omap_dma_cb(int lch, u16 ch_status, void *data) | |
131 | { | |
132 | struct dma_channel *channel = (struct dma_channel *)data; | |
133 | struct tusb_omap_dma_ch *chdat = to_chdat(channel); | |
134 | struct tusb_omap_dma *tusb_dma = chdat->tusb_dma; | |
135 | struct musb *musb = chdat->musb; | |
1d0f11b3 | 136 | struct device *dev = musb->controller; |
550a7375 FB |
137 | struct musb_hw_ep *hw_ep = chdat->hw_ep; |
138 | void __iomem *ep_conf = hw_ep->conf; | |
139 | void __iomem *mbase = musb->mregs; | |
140 | unsigned long remaining, flags, pio; | |
141 | int ch; | |
142 | ||
143 | spin_lock_irqsave(&musb->lock, flags); | |
144 | ||
145 | if (tusb_dma->multichannel) | |
146 | ch = chdat->ch; | |
147 | else | |
148 | ch = tusb_dma->ch; | |
149 | ||
150 | if (ch_status != OMAP_DMA_BLOCK_IRQ) | |
151 | printk(KERN_ERR "TUSB DMA error status: %i\n", ch_status); | |
152 | ||
5c8a86e1 | 153 | dev_dbg(musb->controller, "ep%i %s dma callback ch: %i status: %x\n", |
550a7375 FB |
154 | chdat->epnum, chdat->tx ? "tx" : "rx", |
155 | ch, ch_status); | |
156 | ||
157 | if (chdat->tx) | |
158 | remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET); | |
159 | else | |
160 | remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET); | |
161 | ||
162 | remaining = TUSB_EP_CONFIG_XFR_SIZE(remaining); | |
163 | ||
164 | /* HW issue #10: XFR_SIZE may get corrupt on DMA (both async & sync) */ | |
165 | if (unlikely(remaining > chdat->transfer_len)) { | |
5c8a86e1 | 166 | dev_dbg(musb->controller, "Corrupt %s dma ch%i XFR_SIZE: 0x%08lx\n", |
550a7375 FB |
167 | chdat->tx ? "tx" : "rx", chdat->ch, |
168 | remaining); | |
169 | remaining = 0; | |
170 | } | |
171 | ||
172 | channel->actual_len = chdat->transfer_len - remaining; | |
173 | pio = chdat->len - channel->actual_len; | |
174 | ||
5c8a86e1 | 175 | dev_dbg(musb->controller, "DMA remaining %lu/%u\n", remaining, chdat->transfer_len); |
550a7375 FB |
176 | |
177 | /* Transfer remaining 1 - 31 bytes */ | |
178 | if (pio > 0 && pio < 32) { | |
179 | u8 *buf; | |
180 | ||
5c8a86e1 | 181 | dev_dbg(musb->controller, "Using PIO for remaining %lu bytes\n", pio); |
550a7375 FB |
182 | buf = phys_to_virt((u32)chdat->dma_addr) + chdat->transfer_len; |
183 | if (chdat->tx) { | |
1d0f11b3 TL |
184 | dma_unmap_single(dev, chdat->dma_addr, |
185 | chdat->transfer_len, | |
186 | DMA_TO_DEVICE); | |
550a7375 FB |
187 | musb_write_fifo(hw_ep, pio, buf); |
188 | } else { | |
1d0f11b3 TL |
189 | dma_unmap_single(dev, chdat->dma_addr, |
190 | chdat->transfer_len, | |
191 | DMA_FROM_DEVICE); | |
550a7375 | 192 | musb_read_fifo(hw_ep, pio, buf); |
550a7375 FB |
193 | } |
194 | channel->actual_len += pio; | |
195 | } | |
196 | ||
197 | if (!tusb_dma->multichannel) | |
198 | tusb_omap_free_shared_dmareq(chdat); | |
199 | ||
200 | channel->status = MUSB_DMA_STATUS_FREE; | |
201 | ||
202 | /* Handle only RX callbacks here. TX callbacks must be handled based | |
203 | * on the TUSB DMA status interrupt. | |
204 | * REVISIT: Use both TUSB DMA status interrupt and OMAP DMA callback | |
205 | * interrupt for RX and TX. | |
206 | */ | |
207 | if (!chdat->tx) | |
208 | musb_dma_completion(musb, chdat->epnum, chdat->tx); | |
209 | ||
210 | /* We must terminate short tx transfers manually by setting TXPKTRDY. | |
211 | * REVISIT: This same problem may occur with other MUSB dma as well. | |
212 | * Easy to test with g_ether by pinging the MUSB board with ping -s54. | |
213 | */ | |
214 | if ((chdat->transfer_len < chdat->packet_sz) | |
215 | || (chdat->transfer_len % chdat->packet_sz != 0)) { | |
216 | u16 csr; | |
217 | ||
218 | if (chdat->tx) { | |
5c8a86e1 | 219 | dev_dbg(musb->controller, "terminating short tx packet\n"); |
550a7375 FB |
220 | musb_ep_select(mbase, chdat->epnum); |
221 | csr = musb_readw(hw_ep->regs, MUSB_TXCSR); | |
222 | csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_TXPKTRDY | |
223 | | MUSB_TXCSR_P_WZC_BITS; | |
224 | musb_writew(hw_ep->regs, MUSB_TXCSR, csr); | |
225 | } | |
226 | } | |
227 | ||
228 | spin_unlock_irqrestore(&musb->lock, flags); | |
229 | } | |
230 | ||
231 | static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz, | |
232 | u8 rndis_mode, dma_addr_t dma_addr, u32 len) | |
233 | { | |
234 | struct tusb_omap_dma_ch *chdat = to_chdat(channel); | |
235 | struct tusb_omap_dma *tusb_dma = chdat->tusb_dma; | |
236 | struct musb *musb = chdat->musb; | |
1d0f11b3 | 237 | struct device *dev = musb->controller; |
550a7375 FB |
238 | struct musb_hw_ep *hw_ep = chdat->hw_ep; |
239 | void __iomem *mbase = musb->mregs; | |
240 | void __iomem *ep_conf = hw_ep->conf; | |
241 | dma_addr_t fifo = hw_ep->fifo_sync; | |
242 | struct omap_dma_channel_params dma_params; | |
243 | u32 dma_remaining; | |
244 | int src_burst, dst_burst; | |
245 | u16 csr; | |
246 | int ch; | |
247 | s8 dmareq; | |
248 | s8 sync_dev; | |
249 | ||
250 | if (unlikely(dma_addr & 0x1) || (len < 32) || (len > packet_sz)) | |
251 | return false; | |
252 | ||
253 | /* | |
254 | * HW issue #10: Async dma will eventually corrupt the XFR_SIZE | |
255 | * register which will cause missed DMA interrupt. We could try to | |
256 | * use a timer for the callback, but it is unsafe as the XFR_SIZE | |
257 | * register is corrupt, and we won't know if the DMA worked. | |
258 | */ | |
259 | if (dma_addr & 0x2) | |
260 | return false; | |
261 | ||
262 | /* | |
263 | * Because of HW issue #10, it seems like mixing sync DMA and async | |
264 | * PIO access can confuse the DMA. Make sure XFR_SIZE is reset before | |
265 | * using the channel for DMA. | |
266 | */ | |
267 | if (chdat->tx) | |
268 | dma_remaining = musb_readl(ep_conf, TUSB_EP_TX_OFFSET); | |
269 | else | |
270 | dma_remaining = musb_readl(ep_conf, TUSB_EP_RX_OFFSET); | |
271 | ||
272 | dma_remaining = TUSB_EP_CONFIG_XFR_SIZE(dma_remaining); | |
273 | if (dma_remaining) { | |
5c8a86e1 | 274 | dev_dbg(musb->controller, "Busy %s dma ch%i, not using: %08x\n", |
550a7375 FB |
275 | chdat->tx ? "tx" : "rx", chdat->ch, |
276 | dma_remaining); | |
277 | return false; | |
278 | } | |
279 | ||
280 | chdat->transfer_len = len & ~0x1f; | |
281 | ||
282 | if (len < packet_sz) | |
283 | chdat->transfer_packet_sz = chdat->transfer_len; | |
284 | else | |
285 | chdat->transfer_packet_sz = packet_sz; | |
286 | ||
287 | if (tusb_dma->multichannel) { | |
288 | ch = chdat->ch; | |
289 | dmareq = chdat->dmareq; | |
290 | sync_dev = chdat->sync_dev; | |
291 | } else { | |
292 | if (tusb_omap_use_shared_dmareq(chdat) != 0) { | |
5c8a86e1 | 293 | dev_dbg(musb->controller, "could not get dma for ep%i\n", chdat->epnum); |
550a7375 FB |
294 | return false; |
295 | } | |
296 | if (tusb_dma->ch < 0) { | |
297 | /* REVISIT: This should get blocked earlier, happens | |
298 | * with MSC ErrorRecoveryTest | |
299 | */ | |
300 | WARN_ON(1); | |
301 | return false; | |
302 | } | |
303 | ||
304 | ch = tusb_dma->ch; | |
305 | dmareq = tusb_dma->dmareq; | |
306 | sync_dev = tusb_dma->sync_dev; | |
307 | omap_set_dma_callback(ch, tusb_omap_dma_cb, channel); | |
308 | } | |
309 | ||
310 | chdat->packet_sz = packet_sz; | |
311 | chdat->len = len; | |
312 | channel->actual_len = 0; | |
1d0f11b3 | 313 | chdat->dma_addr = dma_addr; |
550a7375 FB |
314 | channel->status = MUSB_DMA_STATUS_BUSY; |
315 | ||
316 | /* Since we're recycling dma areas, we need to clean or invalidate */ | |
317 | if (chdat->tx) | |
1d0f11b3 TL |
318 | dma_map_single(dev, phys_to_virt(dma_addr), len, |
319 | DMA_TO_DEVICE); | |
550a7375 | 320 | else |
1d0f11b3 TL |
321 | dma_map_single(dev, phys_to_virt(dma_addr), len, |
322 | DMA_FROM_DEVICE); | |
550a7375 FB |
323 | |
324 | /* Use 16-bit transfer if dma_addr is not 32-bit aligned */ | |
325 | if ((dma_addr & 0x3) == 0) { | |
326 | dma_params.data_type = OMAP_DMA_DATA_TYPE_S32; | |
327 | dma_params.elem_count = 8; /* Elements in frame */ | |
328 | } else { | |
329 | dma_params.data_type = OMAP_DMA_DATA_TYPE_S16; | |
330 | dma_params.elem_count = 16; /* Elements in frame */ | |
331 | fifo = hw_ep->fifo_async; | |
332 | } | |
333 | ||
334 | dma_params.frame_count = chdat->transfer_len / 32; /* Burst sz frame */ | |
335 | ||
5c8a86e1 | 336 | dev_dbg(musb->controller, "ep%i %s dma ch%i dma: %08x len: %u(%u) packet_sz: %i(%i)\n", |
550a7375 FB |
337 | chdat->epnum, chdat->tx ? "tx" : "rx", |
338 | ch, dma_addr, chdat->transfer_len, len, | |
339 | chdat->transfer_packet_sz, packet_sz); | |
340 | ||
341 | /* | |
342 | * Prepare omap DMA for transfer | |
343 | */ | |
344 | if (chdat->tx) { | |
345 | dma_params.src_amode = OMAP_DMA_AMODE_POST_INC; | |
346 | dma_params.src_start = (unsigned long)dma_addr; | |
347 | dma_params.src_ei = 0; | |
348 | dma_params.src_fi = 0; | |
349 | ||
350 | dma_params.dst_amode = OMAP_DMA_AMODE_DOUBLE_IDX; | |
351 | dma_params.dst_start = (unsigned long)fifo; | |
352 | dma_params.dst_ei = 1; | |
353 | dma_params.dst_fi = -31; /* Loop 32 byte window */ | |
354 | ||
355 | dma_params.trigger = sync_dev; | |
356 | dma_params.sync_mode = OMAP_DMA_SYNC_FRAME; | |
357 | dma_params.src_or_dst_synch = 0; /* Dest sync */ | |
358 | ||
359 | src_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 read */ | |
360 | dst_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 write */ | |
361 | } else { | |
362 | dma_params.src_amode = OMAP_DMA_AMODE_DOUBLE_IDX; | |
363 | dma_params.src_start = (unsigned long)fifo; | |
364 | dma_params.src_ei = 1; | |
365 | dma_params.src_fi = -31; /* Loop 32 byte window */ | |
366 | ||
367 | dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC; | |
368 | dma_params.dst_start = (unsigned long)dma_addr; | |
369 | dma_params.dst_ei = 0; | |
370 | dma_params.dst_fi = 0; | |
371 | ||
372 | dma_params.trigger = sync_dev; | |
373 | dma_params.sync_mode = OMAP_DMA_SYNC_FRAME; | |
374 | dma_params.src_or_dst_synch = 1; /* Source sync */ | |
375 | ||
376 | src_burst = OMAP_DMA_DATA_BURST_8; /* 8x32 read */ | |
377 | dst_burst = OMAP_DMA_DATA_BURST_16; /* 16x32 write */ | |
378 | } | |
379 | ||
5c8a86e1 | 380 | dev_dbg(musb->controller, "ep%i %s using %i-bit %s dma from 0x%08lx to 0x%08lx\n", |
550a7375 FB |
381 | chdat->epnum, chdat->tx ? "tx" : "rx", |
382 | (dma_params.data_type == OMAP_DMA_DATA_TYPE_S32) ? 32 : 16, | |
383 | ((dma_addr & 0x3) == 0) ? "sync" : "async", | |
384 | dma_params.src_start, dma_params.dst_start); | |
385 | ||
386 | omap_set_dma_params(ch, &dma_params); | |
387 | omap_set_dma_src_burst_mode(ch, src_burst); | |
388 | omap_set_dma_dest_burst_mode(ch, dst_burst); | |
389 | omap_set_dma_write_mode(ch, OMAP_DMA_WRITE_LAST_NON_POSTED); | |
390 | ||
391 | /* | |
392 | * Prepare MUSB for DMA transfer | |
393 | */ | |
394 | if (chdat->tx) { | |
395 | musb_ep_select(mbase, chdat->epnum); | |
396 | csr = musb_readw(hw_ep->regs, MUSB_TXCSR); | |
397 | csr |= (MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB | |
398 | | MUSB_TXCSR_DMAMODE | MUSB_TXCSR_MODE); | |
399 | csr &= ~MUSB_TXCSR_P_UNDERRUN; | |
400 | musb_writew(hw_ep->regs, MUSB_TXCSR, csr); | |
401 | } else { | |
402 | musb_ep_select(mbase, chdat->epnum); | |
403 | csr = musb_readw(hw_ep->regs, MUSB_RXCSR); | |
404 | csr |= MUSB_RXCSR_DMAENAB; | |
405 | csr &= ~(MUSB_RXCSR_AUTOCLEAR | MUSB_RXCSR_DMAMODE); | |
406 | musb_writew(hw_ep->regs, MUSB_RXCSR, | |
407 | csr | MUSB_RXCSR_P_WZC_BITS); | |
408 | } | |
409 | ||
410 | /* | |
411 | * Start DMA transfer | |
412 | */ | |
413 | omap_start_dma(ch); | |
414 | ||
415 | if (chdat->tx) { | |
416 | /* Send transfer_packet_sz packets at a time */ | |
417 | musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET, | |
418 | chdat->transfer_packet_sz); | |
419 | ||
420 | musb_writel(ep_conf, TUSB_EP_TX_OFFSET, | |
421 | TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len)); | |
422 | } else { | |
423 | /* Receive transfer_packet_sz packets at a time */ | |
424 | musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET, | |
425 | chdat->transfer_packet_sz << 16); | |
426 | ||
427 | musb_writel(ep_conf, TUSB_EP_RX_OFFSET, | |
428 | TUSB_EP_CONFIG_XFR_SIZE(chdat->transfer_len)); | |
429 | } | |
430 | ||
431 | return true; | |
432 | } | |
433 | ||
434 | static int tusb_omap_dma_abort(struct dma_channel *channel) | |
435 | { | |
436 | struct tusb_omap_dma_ch *chdat = to_chdat(channel); | |
437 | struct tusb_omap_dma *tusb_dma = chdat->tusb_dma; | |
438 | ||
439 | if (!tusb_dma->multichannel) { | |
440 | if (tusb_dma->ch >= 0) { | |
441 | omap_stop_dma(tusb_dma->ch); | |
442 | omap_free_dma(tusb_dma->ch); | |
443 | tusb_dma->ch = -1; | |
444 | } | |
445 | ||
446 | tusb_dma->dmareq = -1; | |
447 | tusb_dma->sync_dev = -1; | |
448 | } | |
449 | ||
450 | channel->status = MUSB_DMA_STATUS_FREE; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static inline int tusb_omap_dma_allocate_dmareq(struct tusb_omap_dma_ch *chdat) | |
456 | { | |
457 | u32 reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP); | |
458 | int i, dmareq_nr = -1; | |
459 | ||
460 | const int sync_dev[6] = { | |
461 | OMAP24XX_DMA_EXT_DMAREQ0, | |
462 | OMAP24XX_DMA_EXT_DMAREQ1, | |
463 | OMAP242X_DMA_EXT_DMAREQ2, | |
464 | OMAP242X_DMA_EXT_DMAREQ3, | |
465 | OMAP242X_DMA_EXT_DMAREQ4, | |
466 | OMAP242X_DMA_EXT_DMAREQ5, | |
467 | }; | |
468 | ||
469 | for (i = 0; i < MAX_DMAREQ; i++) { | |
470 | int cur = (reg & (0xf << (i * 5))) >> (i * 5); | |
471 | if (cur == 0) { | |
472 | dmareq_nr = i; | |
473 | break; | |
474 | } | |
475 | } | |
476 | ||
477 | if (dmareq_nr == -1) | |
478 | return -EAGAIN; | |
479 | ||
480 | reg |= (chdat->epnum << (dmareq_nr * 5)); | |
481 | if (chdat->tx) | |
482 | reg |= ((1 << 4) << (dmareq_nr * 5)); | |
483 | musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg); | |
484 | ||
485 | chdat->dmareq = dmareq_nr; | |
486 | chdat->sync_dev = sync_dev[chdat->dmareq]; | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | static inline void tusb_omap_dma_free_dmareq(struct tusb_omap_dma_ch *chdat) | |
492 | { | |
493 | u32 reg; | |
494 | ||
495 | if (!chdat || chdat->dmareq < 0) | |
496 | return; | |
497 | ||
498 | reg = musb_readl(chdat->tbase, TUSB_DMA_EP_MAP); | |
499 | reg &= ~(0x1f << (chdat->dmareq * 5)); | |
500 | musb_writel(chdat->tbase, TUSB_DMA_EP_MAP, reg); | |
501 | ||
502 | chdat->dmareq = -1; | |
503 | chdat->sync_dev = -1; | |
504 | } | |
505 | ||
506 | static struct dma_channel *dma_channel_pool[MAX_DMAREQ]; | |
507 | ||
508 | static struct dma_channel * | |
509 | tusb_omap_dma_allocate(struct dma_controller *c, | |
510 | struct musb_hw_ep *hw_ep, | |
511 | u8 tx) | |
512 | { | |
513 | int ret, i; | |
514 | const char *dev_name; | |
515 | struct tusb_omap_dma *tusb_dma; | |
516 | struct musb *musb; | |
517 | void __iomem *tbase; | |
518 | struct dma_channel *channel = NULL; | |
519 | struct tusb_omap_dma_ch *chdat = NULL; | |
520 | u32 reg; | |
521 | ||
522 | tusb_dma = container_of(c, struct tusb_omap_dma, controller); | |
523 | musb = tusb_dma->musb; | |
524 | tbase = musb->ctrl_base; | |
525 | ||
526 | reg = musb_readl(tbase, TUSB_DMA_INT_MASK); | |
527 | if (tx) | |
528 | reg &= ~(1 << hw_ep->epnum); | |
529 | else | |
530 | reg &= ~(1 << (hw_ep->epnum + 15)); | |
531 | musb_writel(tbase, TUSB_DMA_INT_MASK, reg); | |
532 | ||
533 | /* REVISIT: Why does dmareq5 not work? */ | |
534 | if (hw_ep->epnum == 0) { | |
5c8a86e1 | 535 | dev_dbg(musb->controller, "Not allowing DMA for ep0 %s\n", tx ? "tx" : "rx"); |
550a7375 FB |
536 | return NULL; |
537 | } | |
538 | ||
539 | for (i = 0; i < MAX_DMAREQ; i++) { | |
540 | struct dma_channel *ch = dma_channel_pool[i]; | |
541 | if (ch->status == MUSB_DMA_STATUS_UNKNOWN) { | |
542 | ch->status = MUSB_DMA_STATUS_FREE; | |
543 | channel = ch; | |
544 | chdat = ch->private_data; | |
545 | break; | |
546 | } | |
547 | } | |
548 | ||
549 | if (!channel) | |
550 | return NULL; | |
551 | ||
552 | if (tx) { | |
553 | chdat->tx = 1; | |
554 | dev_name = "TUSB transmit"; | |
555 | } else { | |
556 | chdat->tx = 0; | |
557 | dev_name = "TUSB receive"; | |
558 | } | |
559 | ||
560 | chdat->musb = tusb_dma->musb; | |
561 | chdat->tbase = tusb_dma->tbase; | |
562 | chdat->hw_ep = hw_ep; | |
563 | chdat->epnum = hw_ep->epnum; | |
564 | chdat->dmareq = -1; | |
565 | chdat->completed_len = 0; | |
566 | chdat->tusb_dma = tusb_dma; | |
567 | ||
568 | channel->max_len = 0x7fffffff; | |
569 | channel->desired_mode = 0; | |
570 | channel->actual_len = 0; | |
571 | ||
572 | if (tusb_dma->multichannel) { | |
573 | ret = tusb_omap_dma_allocate_dmareq(chdat); | |
574 | if (ret != 0) | |
575 | goto free_dmareq; | |
576 | ||
577 | ret = omap_request_dma(chdat->sync_dev, dev_name, | |
578 | tusb_omap_dma_cb, channel, &chdat->ch); | |
579 | if (ret != 0) | |
580 | goto free_dmareq; | |
581 | } else if (tusb_dma->ch == -1) { | |
582 | tusb_dma->dmareq = 0; | |
583 | tusb_dma->sync_dev = OMAP24XX_DMA_EXT_DMAREQ0; | |
584 | ||
585 | /* Callback data gets set later in the shared dmareq case */ | |
586 | ret = omap_request_dma(tusb_dma->sync_dev, "TUSB shared", | |
587 | tusb_omap_dma_cb, NULL, &tusb_dma->ch); | |
588 | if (ret != 0) | |
589 | goto free_dmareq; | |
590 | ||
591 | chdat->dmareq = -1; | |
592 | chdat->ch = -1; | |
593 | } | |
594 | ||
5c8a86e1 | 595 | dev_dbg(musb->controller, "ep%i %s dma: %s dma%i dmareq%i sync%i\n", |
550a7375 FB |
596 | chdat->epnum, |
597 | chdat->tx ? "tx" : "rx", | |
598 | chdat->ch >= 0 ? "dedicated" : "shared", | |
599 | chdat->ch >= 0 ? chdat->ch : tusb_dma->ch, | |
600 | chdat->dmareq >= 0 ? chdat->dmareq : tusb_dma->dmareq, | |
601 | chdat->sync_dev >= 0 ? chdat->sync_dev : tusb_dma->sync_dev); | |
602 | ||
603 | return channel; | |
604 | ||
605 | free_dmareq: | |
606 | tusb_omap_dma_free_dmareq(chdat); | |
607 | ||
5c8a86e1 | 608 | dev_dbg(musb->controller, "ep%i: Could not get a DMA channel\n", chdat->epnum); |
550a7375 FB |
609 | channel->status = MUSB_DMA_STATUS_UNKNOWN; |
610 | ||
611 | return NULL; | |
612 | } | |
613 | ||
614 | static void tusb_omap_dma_release(struct dma_channel *channel) | |
615 | { | |
616 | struct tusb_omap_dma_ch *chdat = to_chdat(channel); | |
617 | struct musb *musb = chdat->musb; | |
618 | void __iomem *tbase = musb->ctrl_base; | |
619 | u32 reg; | |
620 | ||
5c8a86e1 | 621 | dev_dbg(musb->controller, "ep%i ch%i\n", chdat->epnum, chdat->ch); |
550a7375 FB |
622 | |
623 | reg = musb_readl(tbase, TUSB_DMA_INT_MASK); | |
624 | if (chdat->tx) | |
625 | reg |= (1 << chdat->epnum); | |
626 | else | |
627 | reg |= (1 << (chdat->epnum + 15)); | |
628 | musb_writel(tbase, TUSB_DMA_INT_MASK, reg); | |
629 | ||
630 | reg = musb_readl(tbase, TUSB_DMA_INT_CLEAR); | |
631 | if (chdat->tx) | |
632 | reg |= (1 << chdat->epnum); | |
633 | else | |
634 | reg |= (1 << (chdat->epnum + 15)); | |
635 | musb_writel(tbase, TUSB_DMA_INT_CLEAR, reg); | |
636 | ||
637 | channel->status = MUSB_DMA_STATUS_UNKNOWN; | |
638 | ||
639 | if (chdat->ch >= 0) { | |
640 | omap_stop_dma(chdat->ch); | |
641 | omap_free_dma(chdat->ch); | |
642 | chdat->ch = -1; | |
643 | } | |
644 | ||
645 | if (chdat->dmareq >= 0) | |
646 | tusb_omap_dma_free_dmareq(chdat); | |
647 | ||
648 | channel = NULL; | |
649 | } | |
650 | ||
651 | void dma_controller_destroy(struct dma_controller *c) | |
652 | { | |
653 | struct tusb_omap_dma *tusb_dma; | |
654 | int i; | |
655 | ||
656 | tusb_dma = container_of(c, struct tusb_omap_dma, controller); | |
657 | for (i = 0; i < MAX_DMAREQ; i++) { | |
658 | struct dma_channel *ch = dma_channel_pool[i]; | |
659 | if (ch) { | |
660 | kfree(ch->private_data); | |
661 | kfree(ch); | |
662 | } | |
663 | } | |
664 | ||
94089d56 | 665 | if (tusb_dma && !tusb_dma->multichannel && tusb_dma->ch >= 0) |
550a7375 FB |
666 | omap_free_dma(tusb_dma->ch); |
667 | ||
668 | kfree(tusb_dma); | |
669 | } | |
670 | ||
41ac7b3a | 671 | struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *base) |
550a7375 FB |
672 | { |
673 | void __iomem *tbase = musb->ctrl_base; | |
674 | struct tusb_omap_dma *tusb_dma; | |
675 | int i; | |
676 | ||
677 | /* REVISIT: Get dmareq lines used from board-*.c */ | |
678 | ||
679 | musb_writel(musb->ctrl_base, TUSB_DMA_INT_MASK, 0x7fffffff); | |
680 | musb_writel(musb->ctrl_base, TUSB_DMA_EP_MAP, 0); | |
681 | ||
682 | musb_writel(tbase, TUSB_DMA_REQ_CONF, | |
683 | TUSB_DMA_REQ_CONF_BURST_SIZE(2) | |
684 | | TUSB_DMA_REQ_CONF_DMA_REQ_EN(0x3f) | |
685 | | TUSB_DMA_REQ_CONF_DMA_REQ_ASSER(2)); | |
686 | ||
687 | tusb_dma = kzalloc(sizeof(struct tusb_omap_dma), GFP_KERNEL); | |
688 | if (!tusb_dma) | |
c88ba39c | 689 | goto out; |
550a7375 FB |
690 | |
691 | tusb_dma->musb = musb; | |
692 | tusb_dma->tbase = musb->ctrl_base; | |
693 | ||
694 | tusb_dma->ch = -1; | |
695 | tusb_dma->dmareq = -1; | |
696 | tusb_dma->sync_dev = -1; | |
697 | ||
698 | tusb_dma->controller.start = tusb_omap_dma_start; | |
699 | tusb_dma->controller.stop = tusb_omap_dma_stop; | |
700 | tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate; | |
701 | tusb_dma->controller.channel_release = tusb_omap_dma_release; | |
702 | tusb_dma->controller.channel_program = tusb_omap_dma_program; | |
703 | tusb_dma->controller.channel_abort = tusb_omap_dma_abort; | |
704 | ||
705 | if (tusb_get_revision(musb) >= TUSB_REV_30) | |
706 | tusb_dma->multichannel = 1; | |
707 | ||
708 | for (i = 0; i < MAX_DMAREQ; i++) { | |
709 | struct dma_channel *ch; | |
710 | struct tusb_omap_dma_ch *chdat; | |
711 | ||
712 | ch = kzalloc(sizeof(struct dma_channel), GFP_KERNEL); | |
713 | if (!ch) | |
714 | goto cleanup; | |
715 | ||
716 | dma_channel_pool[i] = ch; | |
717 | ||
718 | chdat = kzalloc(sizeof(struct tusb_omap_dma_ch), GFP_KERNEL); | |
719 | if (!chdat) | |
720 | goto cleanup; | |
721 | ||
722 | ch->status = MUSB_DMA_STATUS_UNKNOWN; | |
723 | ch->private_data = chdat; | |
724 | } | |
725 | ||
726 | return &tusb_dma->controller; | |
727 | ||
728 | cleanup: | |
729 | dma_controller_destroy(&tusb_dma->controller); | |
c88ba39c | 730 | out: |
550a7375 FB |
731 | return NULL; |
732 | } |