Commit | Line | Data |
---|---|---|
550a7375 FB |
1 | /* |
2 | * MUSB OTG driver - support for Mentor's DMA controller | |
3 | * | |
4 | * Copyright 2005 Mentor Graphics Corporation | |
5 | * Copyright (C) 2005-2007 by Texas Instruments | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED | |
22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
24 | * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
25 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
26 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
27 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
28 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
30 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
31 | * | |
32 | */ | |
33 | #include <linux/device.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/platform_device.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
550a7375 | 37 | #include "musb_core.h" |
6995eb68 | 38 | #include "musbhsdma.h" |
550a7375 FB |
39 | |
40 | static int dma_controller_start(struct dma_controller *c) | |
41 | { | |
42 | /* nothing to do */ | |
43 | return 0; | |
44 | } | |
45 | ||
458e6a51 | 46 | static void dma_channel_release(struct dma_channel *channel); |
550a7375 FB |
47 | |
48 | static int dma_controller_stop(struct dma_controller *c) | |
49 | { | |
458e6a51 FB |
50 | struct musb_dma_controller *controller = container_of(c, |
51 | struct musb_dma_controller, controller); | |
52 | struct musb *musb = controller->private_data; | |
53 | struct dma_channel *channel; | |
54 | u8 bit; | |
550a7375 | 55 | |
458e6a51 | 56 | if (controller->used_channels != 0) { |
550a7375 FB |
57 | dev_err(musb->controller, |
58 | "Stopping DMA controller while channel active\n"); | |
59 | ||
458e6a51 FB |
60 | for (bit = 0; bit < MUSB_HSDMA_CHANNELS; bit++) { |
61 | if (controller->used_channels & (1 << bit)) { | |
62 | channel = &controller->channel[bit].channel; | |
63 | dma_channel_release(channel); | |
550a7375 | 64 | |
458e6a51 | 65 | if (!controller->used_channels) |
550a7375 FB |
66 | break; |
67 | } | |
68 | } | |
69 | } | |
458e6a51 | 70 | |
550a7375 FB |
71 | return 0; |
72 | } | |
73 | ||
74 | static struct dma_channel *dma_channel_allocate(struct dma_controller *c, | |
75 | struct musb_hw_ep *hw_ep, u8 transmit) | |
76 | { | |
458e6a51 FB |
77 | struct musb_dma_controller *controller = container_of(c, |
78 | struct musb_dma_controller, controller); | |
79 | struct musb_dma_channel *musb_channel = NULL; | |
80 | struct dma_channel *channel = NULL; | |
81 | u8 bit; | |
82 | ||
83 | for (bit = 0; bit < MUSB_HSDMA_CHANNELS; bit++) { | |
84 | if (!(controller->used_channels & (1 << bit))) { | |
85 | controller->used_channels |= (1 << bit); | |
86 | musb_channel = &(controller->channel[bit]); | |
87 | musb_channel->controller = controller; | |
88 | musb_channel->idx = bit; | |
89 | musb_channel->epnum = hw_ep->epnum; | |
90 | musb_channel->transmit = transmit; | |
91 | channel = &(musb_channel->channel); | |
92 | channel->private_data = musb_channel; | |
93 | channel->status = MUSB_DMA_STATUS_FREE; | |
6587cc0f | 94 | channel->max_len = 0x100000; |
550a7375 | 95 | /* Tx => mode 1; Rx => mode 0 */ |
458e6a51 FB |
96 | channel->desired_mode = transmit; |
97 | channel->actual_len = 0; | |
550a7375 FB |
98 | break; |
99 | } | |
100 | } | |
458e6a51 FB |
101 | |
102 | return channel; | |
550a7375 FB |
103 | } |
104 | ||
458e6a51 | 105 | static void dma_channel_release(struct dma_channel *channel) |
550a7375 | 106 | { |
458e6a51 | 107 | struct musb_dma_channel *musb_channel = channel->private_data; |
550a7375 | 108 | |
458e6a51 FB |
109 | channel->actual_len = 0; |
110 | musb_channel->start_addr = 0; | |
111 | musb_channel->len = 0; | |
550a7375 | 112 | |
458e6a51 FB |
113 | musb_channel->controller->used_channels &= |
114 | ~(1 << musb_channel->idx); | |
550a7375 | 115 | |
458e6a51 | 116 | channel->status = MUSB_DMA_STATUS_UNKNOWN; |
550a7375 FB |
117 | } |
118 | ||
458e6a51 | 119 | static void configure_channel(struct dma_channel *channel, |
550a7375 FB |
120 | u16 packet_sz, u8 mode, |
121 | dma_addr_t dma_addr, u32 len) | |
122 | { | |
458e6a51 FB |
123 | struct musb_dma_channel *musb_channel = channel->private_data; |
124 | struct musb_dma_controller *controller = musb_channel->controller; | |
5c8a86e1 | 125 | struct musb *musb = controller->private_data; |
458e6a51 FB |
126 | void __iomem *mbase = controller->base; |
127 | u8 bchannel = musb_channel->idx; | |
550a7375 FB |
128 | u16 csr = 0; |
129 | ||
5c8a86e1 | 130 | dev_dbg(musb->controller, "%p, pkt_sz %d, addr 0x%x, len %d, mode %d\n", |
458e6a51 | 131 | channel, packet_sz, dma_addr, len, mode); |
550a7375 FB |
132 | |
133 | if (mode) { | |
134 | csr |= 1 << MUSB_HSDMA_MODE1_SHIFT; | |
135 | BUG_ON(len < packet_sz); | |
550a7375 | 136 | } |
c0f1f8e3 HH |
137 | csr |= MUSB_HSDMA_BURSTMODE_INCR16 |
138 | << MUSB_HSDMA_BURSTMODE_SHIFT; | |
550a7375 | 139 | |
458e6a51 | 140 | csr |= (musb_channel->epnum << MUSB_HSDMA_ENDPOINT_SHIFT) |
550a7375 FB |
141 | | (1 << MUSB_HSDMA_ENABLE_SHIFT) |
142 | | (1 << MUSB_HSDMA_IRQENABLE_SHIFT) | |
458e6a51 | 143 | | (musb_channel->transmit |
550a7375 FB |
144 | ? (1 << MUSB_HSDMA_TRANSMIT_SHIFT) |
145 | : 0); | |
146 | ||
147 | /* address/count */ | |
6995eb68 BW |
148 | musb_write_hsdma_addr(mbase, bchannel, dma_addr); |
149 | musb_write_hsdma_count(mbase, bchannel, len); | |
550a7375 FB |
150 | |
151 | /* control (this should start things) */ | |
152 | musb_writew(mbase, | |
458e6a51 | 153 | MUSB_HSDMA_CHANNEL_OFFSET(bchannel, MUSB_HSDMA_CONTROL), |
550a7375 FB |
154 | csr); |
155 | } | |
156 | ||
458e6a51 | 157 | static int dma_channel_program(struct dma_channel *channel, |
550a7375 FB |
158 | u16 packet_sz, u8 mode, |
159 | dma_addr_t dma_addr, u32 len) | |
160 | { | |
458e6a51 | 161 | struct musb_dma_channel *musb_channel = channel->private_data; |
6e16edfe AG |
162 | struct musb_dma_controller *controller = musb_channel->controller; |
163 | struct musb *musb = controller->private_data; | |
550a7375 | 164 | |
5c8a86e1 | 165 | dev_dbg(musb->controller, "ep%d-%s pkt_sz %d, dma_addr 0x%x length %d, mode %d\n", |
458e6a51 FB |
166 | musb_channel->epnum, |
167 | musb_channel->transmit ? "Tx" : "Rx", | |
550a7375 FB |
168 | packet_sz, dma_addr, len, mode); |
169 | ||
458e6a51 FB |
170 | BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN || |
171 | channel->status == MUSB_DMA_STATUS_BUSY); | |
550a7375 | 172 | |
13254307 MF |
173 | /* Let targets check/tweak the arguments */ |
174 | if (musb->ops->adjust_channel_params) { | |
175 | int ret = musb->ops->adjust_channel_params(channel, | |
176 | packet_sz, &mode, &dma_addr, &len); | |
177 | if (ret) | |
178 | return ret; | |
179 | } | |
180 | ||
6e16edfe AG |
181 | /* |
182 | * The DMA engine in RTL1.8 and above cannot handle | |
183 | * DMA addresses that are not aligned to a 4 byte boundary. | |
184 | * It ends up masking the last two bits of the address | |
185 | * programmed in DMA_ADDR. | |
186 | * | |
187 | * Fail such DMA transfers, so that the backup PIO mode | |
188 | * can carry out the transfer | |
189 | */ | |
190 | if ((musb->hwvers >= MUSB_HWVERS_1800) && (dma_addr % 4)) | |
191 | return false; | |
192 | ||
458e6a51 FB |
193 | channel->actual_len = 0; |
194 | musb_channel->start_addr = dma_addr; | |
195 | musb_channel->len = len; | |
196 | musb_channel->max_packet_sz = packet_sz; | |
197 | channel->status = MUSB_DMA_STATUS_BUSY; | |
550a7375 | 198 | |
8ca47c8a | 199 | configure_channel(channel, packet_sz, mode, dma_addr, len); |
550a7375 FB |
200 | |
201 | return true; | |
202 | } | |
203 | ||
458e6a51 | 204 | static int dma_channel_abort(struct dma_channel *channel) |
550a7375 | 205 | { |
458e6a51 FB |
206 | struct musb_dma_channel *musb_channel = channel->private_data; |
207 | void __iomem *mbase = musb_channel->controller->base; | |
208 | ||
209 | u8 bchannel = musb_channel->idx; | |
b6e434a5 | 210 | int offset; |
550a7375 FB |
211 | u16 csr; |
212 | ||
458e6a51 FB |
213 | if (channel->status == MUSB_DMA_STATUS_BUSY) { |
214 | if (musb_channel->transmit) { | |
b6e434a5 SS |
215 | offset = MUSB_EP_OFFSET(musb_channel->epnum, |
216 | MUSB_TXCSR); | |
217 | ||
218 | /* | |
219 | * The programming guide says that we must clear | |
220 | * the DMAENAB bit before the DMAMODE bit... | |
221 | */ | |
222 | csr = musb_readw(mbase, offset); | |
223 | csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB); | |
224 | musb_writew(mbase, offset, csr); | |
225 | csr &= ~MUSB_TXCSR_DMAMODE; | |
226 | musb_writew(mbase, offset, csr); | |
550a7375 | 227 | } else { |
b6e434a5 SS |
228 | offset = MUSB_EP_OFFSET(musb_channel->epnum, |
229 | MUSB_RXCSR); | |
230 | ||
231 | csr = musb_readw(mbase, offset); | |
550a7375 FB |
232 | csr &= ~(MUSB_RXCSR_AUTOCLEAR | |
233 | MUSB_RXCSR_DMAENAB | | |
234 | MUSB_RXCSR_DMAMODE); | |
b6e434a5 | 235 | musb_writew(mbase, offset, csr); |
550a7375 FB |
236 | } |
237 | ||
238 | musb_writew(mbase, | |
458e6a51 | 239 | MUSB_HSDMA_CHANNEL_OFFSET(bchannel, MUSB_HSDMA_CONTROL), |
550a7375 | 240 | 0); |
6995eb68 BW |
241 | musb_write_hsdma_addr(mbase, bchannel, 0); |
242 | musb_write_hsdma_count(mbase, bchannel, 0); | |
458e6a51 | 243 | channel->status = MUSB_DMA_STATUS_FREE; |
550a7375 | 244 | } |
458e6a51 | 245 | |
550a7375 FB |
246 | return 0; |
247 | } | |
248 | ||
249 | static irqreturn_t dma_controller_irq(int irq, void *private_data) | |
250 | { | |
458e6a51 FB |
251 | struct musb_dma_controller *controller = private_data; |
252 | struct musb *musb = controller->private_data; | |
253 | struct musb_dma_channel *musb_channel; | |
254 | struct dma_channel *channel; | |
255 | ||
256 | void __iomem *mbase = controller->base; | |
257 | ||
550a7375 | 258 | irqreturn_t retval = IRQ_NONE; |
458e6a51 | 259 | |
550a7375 FB |
260 | unsigned long flags; |
261 | ||
458e6a51 FB |
262 | u8 bchannel; |
263 | u8 int_hsdma; | |
264 | ||
f933a0c0 | 265 | u32 addr, count; |
458e6a51 FB |
266 | u16 csr; |
267 | ||
550a7375 FB |
268 | spin_lock_irqsave(&musb->lock, flags); |
269 | ||
270 | int_hsdma = musb_readb(mbase, MUSB_HSDMA_INTR); | |
550a7375 | 271 | |
6bd03e7b CC |
272 | #ifdef CONFIG_BLACKFIN |
273 | /* Clear DMA interrupt flags */ | |
274 | musb_writeb(mbase, MUSB_HSDMA_INTR, int_hsdma); | |
275 | #endif | |
276 | ||
f933a0c0 | 277 | if (!int_hsdma) { |
5c8a86e1 | 278 | dev_dbg(musb->controller, "spurious DMA irq\n"); |
f933a0c0 AG |
279 | |
280 | for (bchannel = 0; bchannel < MUSB_HSDMA_CHANNELS; bchannel++) { | |
281 | musb_channel = (struct musb_dma_channel *) | |
282 | &(controller->channel[bchannel]); | |
283 | channel = &musb_channel->channel; | |
284 | if (channel->status == MUSB_DMA_STATUS_BUSY) { | |
285 | count = musb_read_hsdma_count(mbase, bchannel); | |
286 | ||
287 | if (count == 0) | |
288 | int_hsdma |= (1 << bchannel); | |
289 | } | |
290 | } | |
291 | ||
5c8a86e1 | 292 | dev_dbg(musb->controller, "int_hsdma = 0x%x\n", int_hsdma); |
f933a0c0 AG |
293 | |
294 | if (!int_hsdma) | |
295 | goto done; | |
296 | } | |
297 | ||
458e6a51 FB |
298 | for (bchannel = 0; bchannel < MUSB_HSDMA_CHANNELS; bchannel++) { |
299 | if (int_hsdma & (1 << bchannel)) { | |
300 | musb_channel = (struct musb_dma_channel *) | |
301 | &(controller->channel[bchannel]); | |
302 | channel = &musb_channel->channel; | |
550a7375 FB |
303 | |
304 | csr = musb_readw(mbase, | |
458e6a51 | 305 | MUSB_HSDMA_CHANNEL_OFFSET(bchannel, |
550a7375 FB |
306 | MUSB_HSDMA_CONTROL)); |
307 | ||
458e6a51 FB |
308 | if (csr & (1 << MUSB_HSDMA_BUSERROR_SHIFT)) { |
309 | musb_channel->channel.status = | |
550a7375 | 310 | MUSB_DMA_STATUS_BUS_ABORT; |
458e6a51 | 311 | } else { |
550a7375 FB |
312 | u8 devctl; |
313 | ||
6995eb68 BW |
314 | addr = musb_read_hsdma_addr(mbase, |
315 | bchannel); | |
458e6a51 FB |
316 | channel->actual_len = addr |
317 | - musb_channel->start_addr; | |
550a7375 | 318 | |
5c8a86e1 | 319 | dev_dbg(musb->controller, "ch %p, 0x%x -> 0x%x (%zu / %d) %s\n", |
458e6a51 FB |
320 | channel, musb_channel->start_addr, |
321 | addr, channel->actual_len, | |
322 | musb_channel->len, | |
323 | (channel->actual_len | |
324 | < musb_channel->len) ? | |
550a7375 FB |
325 | "=> reconfig 0" : "=> complete"); |
326 | ||
327 | devctl = musb_readb(mbase, MUSB_DEVCTL); | |
328 | ||
458e6a51 | 329 | channel->status = MUSB_DMA_STATUS_FREE; |
550a7375 FB |
330 | |
331 | /* completed */ | |
332 | if ((devctl & MUSB_DEVCTL_HM) | |
458e6a51 FB |
333 | && (musb_channel->transmit) |
334 | && ((channel->desired_mode == 0) | |
335 | || (channel->actual_len & | |
336 | (musb_channel->max_packet_sz - 1))) | |
b6e434a5 SS |
337 | ) { |
338 | u8 epnum = musb_channel->epnum; | |
339 | int offset = MUSB_EP_OFFSET(epnum, | |
340 | MUSB_TXCSR); | |
341 | u16 txcsr; | |
342 | ||
343 | /* | |
344 | * The programming guide says that we | |
345 | * must clear DMAENAB before DMAMODE. | |
346 | */ | |
347 | musb_ep_select(mbase, epnum); | |
348 | txcsr = musb_readw(mbase, offset); | |
349 | txcsr &= ~(MUSB_TXCSR_DMAENAB | |
350 | | MUSB_TXCSR_AUTOSET); | |
351 | musb_writew(mbase, offset, txcsr); | |
550a7375 | 352 | /* Send out the packet */ |
b6e434a5 SS |
353 | txcsr &= ~MUSB_TXCSR_DMAMODE; |
354 | txcsr |= MUSB_TXCSR_TXPKTRDY; | |
355 | musb_writew(mbase, offset, txcsr); | |
458e6a51 | 356 | } |
c7bbc056 SS |
357 | musb_dma_completion(musb, musb_channel->epnum, |
358 | musb_channel->transmit); | |
550a7375 FB |
359 | } |
360 | } | |
361 | } | |
6995eb68 | 362 | |
550a7375 FB |
363 | retval = IRQ_HANDLED; |
364 | done: | |
365 | spin_unlock_irqrestore(&musb->lock, flags); | |
366 | return retval; | |
367 | } | |
368 | ||
369 | void dma_controller_destroy(struct dma_controller *c) | |
370 | { | |
458e6a51 FB |
371 | struct musb_dma_controller *controller = container_of(c, |
372 | struct musb_dma_controller, controller); | |
550a7375 | 373 | |
550a7375 FB |
374 | if (!controller) |
375 | return; | |
376 | ||
377 | if (controller->irq) | |
378 | free_irq(controller->irq, c); | |
379 | ||
380 | kfree(controller); | |
381 | } | |
382 | ||
41ac7b3a | 383 | struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *base) |
550a7375 FB |
384 | { |
385 | struct musb_dma_controller *controller; | |
386 | struct device *dev = musb->controller; | |
387 | struct platform_device *pdev = to_platform_device(dev); | |
fcf173e4 | 388 | int irq = platform_get_irq_byname(pdev, "dma"); |
550a7375 | 389 | |
7effdbd6 | 390 | if (irq <= 0) { |
550a7375 FB |
391 | dev_err(dev, "No DMA interrupt line!\n"); |
392 | return NULL; | |
393 | } | |
394 | ||
458e6a51 | 395 | controller = kzalloc(sizeof(*controller), GFP_KERNEL); |
550a7375 FB |
396 | if (!controller) |
397 | return NULL; | |
398 | ||
458e6a51 FB |
399 | controller->channel_count = MUSB_HSDMA_CHANNELS; |
400 | controller->private_data = musb; | |
401 | controller->base = base; | |
550a7375 | 402 | |
458e6a51 FB |
403 | controller->controller.start = dma_controller_start; |
404 | controller->controller.stop = dma_controller_stop; | |
405 | controller->controller.channel_alloc = dma_channel_allocate; | |
406 | controller->controller.channel_release = dma_channel_release; | |
407 | controller->controller.channel_program = dma_channel_program; | |
408 | controller->controller.channel_abort = dma_channel_abort; | |
550a7375 | 409 | |
b5dd18d8 | 410 | if (request_irq(irq, dma_controller_irq, 0, |
427c4f33 | 411 | dev_name(musb->controller), &controller->controller)) { |
550a7375 | 412 | dev_err(dev, "request_irq %d failed!\n", irq); |
458e6a51 FB |
413 | dma_controller_destroy(&controller->controller); |
414 | ||
550a7375 FB |
415 | return NULL; |
416 | } | |
417 | ||
418 | controller->irq = irq; | |
419 | ||
458e6a51 | 420 | return &controller->controller; |
550a7375 | 421 | } |