fea4f08d1b588040f657bea538de63773c081aac
1 /*
2 * MUSB OTG controller driver for Blackfin Processors
3 *
4 * Copyright 2006-2008 Analog Devices Inc.
5 *
6 * Enter bugs at http://blackfin.uclinux.org/
7 *
8 * Licensed under the GPL-2 or later.
9 */
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/init.h>
15 #include <linux/list.h>
16 #include <linux/gpio.h>
17 #include <linux/io.h>
18 #include <linux/platform_device.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/prefetch.h>
22 #include <asm/cacheflush.h>
24 #include "musb_core.h"
25 #include "musbhsdma.h"
26 #include "blackfin.h"
28 struct bfin_glue {
29 struct device *dev;
30 struct platform_device *musb;
31 };
32 #define glue_to_musb(g) platform_get_drvdata(g->musb)
34 /*
35 * Load an endpoint's FIFO
36 */
37 static void bfin_musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len,
38 const u8 *src)
39 {
40 struct musb *musb = hw_ep->musb;
41 void __iomem *fifo = hw_ep->fifo;
42 void __iomem *epio = hw_ep->regs;
43 u8 epnum = hw_ep->epnum;
45 prefetch((u8 *)src);
47 musb_writew(epio, MUSB_TXCOUNT, len);
49 dev_dbg(musb->controller, "TX ep%d fifo %p count %d buf %p, epio %p\n",
50 hw_ep->epnum, fifo, len, src, epio);
52 dump_fifo_data(src, len);
54 if (!ANOMALY_05000380 && epnum != 0) {
55 u16 dma_reg;
57 flush_dcache_range((unsigned long)src,
58 (unsigned long)(src + len));
60 /* Setup DMA address register */
61 dma_reg = (u32)src;
62 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
63 SSYNC();
65 dma_reg = (u32)src >> 16;
66 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
67 SSYNC();
69 /* Setup DMA count register */
70 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
71 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
72 SSYNC();
74 /* Enable the DMA */
75 dma_reg = (epnum << 4) | DMA_ENA | INT_ENA | DIRECTION;
76 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
77 SSYNC();
79 /* Wait for compelete */
80 while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
81 cpu_relax();
83 /* acknowledge dma interrupt */
84 bfin_write_USB_DMA_INTERRUPT(1 << epnum);
85 SSYNC();
87 /* Reset DMA */
88 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
89 SSYNC();
90 } else {
91 SSYNC();
93 if (unlikely((unsigned long)src & 0x01))
94 outsw_8((unsigned long)fifo, src, (len + 1) >> 1);
95 else
96 outsw((unsigned long)fifo, src, (len + 1) >> 1);
97 }
98 }
99 /*
100 * Unload an endpoint's FIFO
101 */
102 static void bfin_musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
103 {
104 struct musb *musb = hw_ep->musb;
105 void __iomem *fifo = hw_ep->fifo;
106 u8 epnum = hw_ep->epnum;
108 if (ANOMALY_05000467 && epnum != 0) {
109 u16 dma_reg;
111 invalidate_dcache_range((unsigned long)dst,
112 (unsigned long)(dst + len));
114 /* Setup DMA address register */
115 dma_reg = (u32)dst;
116 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
117 SSYNC();
119 dma_reg = (u32)dst >> 16;
120 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
121 SSYNC();
123 /* Setup DMA count register */
124 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
125 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
126 SSYNC();
128 /* Enable the DMA */
129 dma_reg = (epnum << 4) | DMA_ENA | INT_ENA;
130 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
131 SSYNC();
133 /* Wait for compelete */
134 while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
135 cpu_relax();
137 /* acknowledge dma interrupt */
138 bfin_write_USB_DMA_INTERRUPT(1 << epnum);
139 SSYNC();
141 /* Reset DMA */
142 bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
143 SSYNC();
144 } else {
145 SSYNC();
146 /* Read the last byte of packet with odd size from address fifo + 4
147 * to trigger 1 byte access to EP0 FIFO.
148 */
149 if (len == 1)
150 *dst = (u8)inw((unsigned long)fifo + 4);
151 else {
152 if (unlikely((unsigned long)dst & 0x01))
153 insw_8((unsigned long)fifo, dst, len >> 1);
154 else
155 insw((unsigned long)fifo, dst, len >> 1);
157 if (len & 0x01)
158 *(dst + len - 1) = (u8)inw((unsigned long)fifo + 4);
159 }
160 }
161 dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
162 'R', hw_ep->epnum, fifo, len, dst);
164 dump_fifo_data(dst, len);
165 }
167 static irqreturn_t blackfin_interrupt(int irq, void *__hci)
168 {
169 unsigned long flags;
170 irqreturn_t retval = IRQ_NONE;
171 struct musb *musb = __hci;
173 spin_lock_irqsave(&musb->lock, flags);
175 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
176 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
177 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
179 if (musb->int_usb || musb->int_tx || musb->int_rx) {
180 musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
181 musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);
182 musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);
183 retval = musb_interrupt(musb);
184 }
186 /* Start sampling ID pin, when plug is removed from MUSB */
187 if ((is_otg_enabled(musb) && (musb->xceiv->state == OTG_STATE_B_IDLE
188 || musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) ||
189 (musb->int_usb & MUSB_INTR_DISCONNECT && is_host_active(musb))) {
190 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
191 musb->a_wait_bcon = TIMER_DELAY;
192 }
194 spin_unlock_irqrestore(&musb->lock, flags);
196 return retval;
197 }
199 static void musb_conn_timer_handler(unsigned long _musb)
200 {
201 struct musb *musb = (void *)_musb;
202 unsigned long flags;
203 u16 val;
204 static u8 toggle;
206 spin_lock_irqsave(&musb->lock, flags);
207 switch (musb->xceiv->state) {
208 case OTG_STATE_A_IDLE:
209 case OTG_STATE_A_WAIT_BCON:
210 /* Start a new session */
211 val = musb_readw(musb->mregs, MUSB_DEVCTL);
212 val &= ~MUSB_DEVCTL_SESSION;
213 musb_writew(musb->mregs, MUSB_DEVCTL, val);
214 val |= MUSB_DEVCTL_SESSION;
215 musb_writew(musb->mregs, MUSB_DEVCTL, val);
216 /* Check if musb is host or peripheral. */
217 val = musb_readw(musb->mregs, MUSB_DEVCTL);
219 if (!(val & MUSB_DEVCTL_BDEVICE)) {
220 gpio_set_value(musb->config->gpio_vrsel, 1);
221 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
222 } else {
223 gpio_set_value(musb->config->gpio_vrsel, 0);
224 /* Ignore VBUSERROR and SUSPEND IRQ */
225 val = musb_readb(musb->mregs, MUSB_INTRUSBE);
226 val &= ~MUSB_INTR_VBUSERROR;
227 musb_writeb(musb->mregs, MUSB_INTRUSBE, val);
229 val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR;
230 musb_writeb(musb->mregs, MUSB_INTRUSB, val);
231 if (is_otg_enabled(musb))
232 musb->xceiv->state = OTG_STATE_B_IDLE;
233 else
234 musb_writeb(musb->mregs, MUSB_POWER, MUSB_POWER_HSENAB);
235 }
236 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
237 break;
238 case OTG_STATE_B_IDLE:
240 if (!is_peripheral_enabled(musb))
241 break;
242 /* Start a new session. It seems that MUSB needs taking
243 * some time to recognize the type of the plug inserted?
244 */
245 val = musb_readw(musb->mregs, MUSB_DEVCTL);
246 val |= MUSB_DEVCTL_SESSION;
247 musb_writew(musb->mregs, MUSB_DEVCTL, val);
248 val = musb_readw(musb->mregs, MUSB_DEVCTL);
250 if (!(val & MUSB_DEVCTL_BDEVICE)) {
251 gpio_set_value(musb->config->gpio_vrsel, 1);
252 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
253 } else {
254 gpio_set_value(musb->config->gpio_vrsel, 0);
256 /* Ignore VBUSERROR and SUSPEND IRQ */
257 val = musb_readb(musb->mregs, MUSB_INTRUSBE);
258 val &= ~MUSB_INTR_VBUSERROR;
259 musb_writeb(musb->mregs, MUSB_INTRUSBE, val);
261 val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR;
262 musb_writeb(musb->mregs, MUSB_INTRUSB, val);
264 /* Toggle the Soft Conn bit, so that we can response to
265 * the inserting of either A-plug or B-plug.
266 */
267 if (toggle) {
268 val = musb_readb(musb->mregs, MUSB_POWER);
269 val &= ~MUSB_POWER_SOFTCONN;
270 musb_writeb(musb->mregs, MUSB_POWER, val);
271 toggle = 0;
272 } else {
273 val = musb_readb(musb->mregs, MUSB_POWER);
274 val |= MUSB_POWER_SOFTCONN;
275 musb_writeb(musb->mregs, MUSB_POWER, val);
276 toggle = 1;
277 }
278 /* The delay time is set to 1/4 second by default,
279 * shortening it, if accelerating A-plug detection
280 * is needed in OTG mode.
281 */
282 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY / 4);
283 }
284 break;
285 default:
286 dev_dbg(musb->controller, "%s state not handled\n",
287 otg_state_string(musb->xceiv->state));
288 break;
289 }
290 spin_unlock_irqrestore(&musb->lock, flags);
292 dev_dbg(musb->controller, "state is %s\n",
293 otg_state_string(musb->xceiv->state));
294 }
296 static void bfin_musb_enable(struct musb *musb)
297 {
298 if (!is_otg_enabled(musb) && is_host_enabled(musb)) {
299 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
300 musb->a_wait_bcon = TIMER_DELAY;
301 }
302 }
304 static void bfin_musb_disable(struct musb *musb)
305 {
306 }
308 static void bfin_musb_set_vbus(struct musb *musb, int is_on)
309 {
310 int value = musb->config->gpio_vrsel_active;
311 if (!is_on)
312 value = !value;
313 gpio_set_value(musb->config->gpio_vrsel, value);
315 dev_dbg(musb->controller, "VBUS %s, devctl %02x "
316 /* otg %3x conf %08x prcm %08x */ "\n",
317 otg_state_string(musb->xceiv->state),
318 musb_readb(musb->mregs, MUSB_DEVCTL));
319 }
321 static int bfin_musb_set_power(struct otg_transceiver *x, unsigned mA)
322 {
323 return 0;
324 }
326 static void bfin_musb_try_idle(struct musb *musb, unsigned long timeout)
327 {
328 if (!is_otg_enabled(musb) && is_host_enabled(musb))
329 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
330 }
332 static int bfin_musb_vbus_status(struct musb *musb)
333 {
334 return 0;
335 }
337 static int bfin_musb_set_mode(struct musb *musb, u8 musb_mode)
338 {
339 return -EIO;
340 }
342 static int bfin_musb_adjust_channel_params(struct dma_channel *channel,
343 u16 packet_sz, u8 *mode,
344 dma_addr_t *dma_addr, u32 *len)
345 {
346 struct musb_dma_channel *musb_channel = channel->private_data;
348 /*
349 * Anomaly 05000450 might cause data corruption when using DMA
350 * MODE 1 transmits with short packet. So to work around this,
351 * we truncate all MODE 1 transfers down to a multiple of the
352 * max packet size, and then do the last short packet transfer
353 * (if there is any) using MODE 0.
354 */
355 if (ANOMALY_05000450) {
356 if (musb_channel->transmit && *mode == 1)
357 *len = *len - (*len % packet_sz);
358 }
360 return 0;
361 }
363 static void bfin_musb_reg_init(struct musb *musb)
364 {
365 if (ANOMALY_05000346) {
366 bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value);
367 SSYNC();
368 }
370 if (ANOMALY_05000347) {
371 bfin_write_USB_APHY_CNTRL(0x0);
372 SSYNC();
373 }
375 /* Configure PLL oscillator register */
376 bfin_write_USB_PLLOSC_CTRL(0x3080 |
377 ((480/musb->config->clkin) << 1));
378 SSYNC();
380 bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1);
381 SSYNC();
383 bfin_write_USB_EP_NI0_RXMAXP(64);
384 SSYNC();
386 bfin_write_USB_EP_NI0_TXMAXP(64);
387 SSYNC();
389 /* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/
390 bfin_write_USB_GLOBINTR(0x7);
391 SSYNC();
393 bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA | EP1_TX_ENA | EP2_TX_ENA |
394 EP3_TX_ENA | EP4_TX_ENA | EP5_TX_ENA |
395 EP6_TX_ENA | EP7_TX_ENA | EP1_RX_ENA |
396 EP2_RX_ENA | EP3_RX_ENA | EP4_RX_ENA |
397 EP5_RX_ENA | EP6_RX_ENA | EP7_RX_ENA);
398 SSYNC();
399 }
401 static int bfin_musb_init(struct musb *musb)
402 {
404 /*
405 * Rev 1.0 BF549 EZ-KITs require PE7 to be high for both DEVICE
406 * and OTG HOST modes, while rev 1.1 and greater require PE7 to
407 * be low for DEVICE mode and high for HOST mode. We set it high
408 * here because we are in host mode
409 */
411 if (gpio_request(musb->config->gpio_vrsel, "USB_VRSEL")) {
412 printk(KERN_ERR "Failed ro request USB_VRSEL GPIO_%d\n",
413 musb->config->gpio_vrsel);
414 return -ENODEV;
415 }
416 gpio_direction_output(musb->config->gpio_vrsel, 0);
418 usb_nop_xceiv_register();
419 musb->xceiv = otg_get_transceiver();
420 if (!musb->xceiv) {
421 gpio_free(musb->config->gpio_vrsel);
422 return -ENODEV;
423 }
425 bfin_musb_reg_init(musb);
427 if (is_host_enabled(musb)) {
428 setup_timer(&musb_conn_timer,
429 musb_conn_timer_handler, (unsigned long) musb);
430 }
431 if (is_peripheral_enabled(musb))
432 musb->xceiv->set_power = bfin_musb_set_power;
434 musb->isr = blackfin_interrupt;
435 musb->double_buffer_not_ok = true;
437 return 0;
438 }
440 static int bfin_musb_exit(struct musb *musb)
441 {
442 gpio_free(musb->config->gpio_vrsel);
444 otg_put_transceiver(musb->xceiv);
445 usb_nop_xceiv_unregister();
446 return 0;
447 }
449 static const struct musb_platform_ops bfin_ops = {
450 .fifo_mode = 2,
451 .init = bfin_musb_init,
452 .exit = bfin_musb_exit,
454 .enable = bfin_musb_enable,
455 .disable = bfin_musb_disable,
457 .read_fifo = bfin_musb_read_fifo,
458 .write_fifo = bfin_musb_write_fifo,
460 .set_mode = bfin_musb_set_mode,
461 .try_idle = bfin_musb_try_idle,
463 .vbus_status = bfin_musb_vbus_status,
464 .set_vbus = bfin_musb_set_vbus,
466 .adjust_channel_params = bfin_musb_adjust_channel_params,
467 };
469 static u64 bfin_dmamask = DMA_BIT_MASK(32);
471 static int __init bfin_probe(struct platform_device *pdev)
472 {
473 struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
474 struct platform_device *musb;
475 struct bfin_glue *glue;
477 int ret = -ENOMEM;
479 glue = kzalloc(sizeof(*glue), GFP_KERNEL);
480 if (!glue) {
481 dev_err(&pdev->dev, "failed to allocate glue context\n");
482 goto err0;
483 }
485 musb = platform_device_alloc("musb-hdrc", -1);
486 if (!musb) {
487 dev_err(&pdev->dev, "failed to allocate musb device\n");
488 goto err1;
489 }
491 musb->dev.parent = &pdev->dev;
492 musb->dev.dma_mask = &bfin_dmamask;
493 musb->dev.coherent_dma_mask = bfin_dmamask;
495 glue->dev = &pdev->dev;
496 glue->musb = musb;
498 pdata->platform_ops = &bfin_ops;
500 platform_set_drvdata(pdev, glue);
502 ret = platform_device_add_resources(musb, pdev->resource,
503 pdev->num_resources);
504 if (ret) {
505 dev_err(&pdev->dev, "failed to add resources\n");
506 goto err2;
507 }
509 ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
510 if (ret) {
511 dev_err(&pdev->dev, "failed to add platform_data\n");
512 goto err2;
513 }
515 ret = platform_device_add(musb);
516 if (ret) {
517 dev_err(&pdev->dev, "failed to register musb device\n");
518 goto err2;
519 }
521 return 0;
523 err2:
524 platform_device_put(musb);
526 err1:
527 kfree(glue);
529 err0:
530 return ret;
531 }
533 static int __exit bfin_remove(struct platform_device *pdev)
534 {
535 struct bfin_glue *glue = platform_get_drvdata(pdev);
537 platform_device_del(glue->musb);
538 platform_device_put(glue->musb);
539 kfree(glue);
541 return 0;
542 }
544 #ifdef CONFIG_PM
545 static int bfin_suspend(struct device *dev)
546 {
547 struct bfin_glue *glue = dev_get_drvdata(dev);
548 struct musb *musb = glue_to_musb(glue);
550 if (is_host_active(musb))
551 /*
552 * During hibernate gpio_vrsel will change from high to low
553 * low which will generate wakeup event resume the system
554 * immediately. Set it to 0 before hibernate to avoid this
555 * wakeup event.
556 */
557 gpio_set_value(musb->config->gpio_vrsel, 0);
559 return 0;
560 }
562 static int bfin_resume(struct device *dev)
563 {
564 struct bfin_glue *glue = dev_get_drvdata(dev);
565 struct musb *musb = glue_to_musb(glue);
567 bfin_musb_reg_init(musb);
569 return 0;
570 }
572 static struct dev_pm_ops bfin_pm_ops = {
573 .suspend = bfin_suspend,
574 .resume = bfin_resume,
575 };
577 #define DEV_PM_OPS &bfin_pm_ops
578 #else
579 #define DEV_PM_OPS NULL
580 #endif
582 static struct platform_driver bfin_driver = {
583 .remove = __exit_p(bfin_remove),
584 .driver = {
585 .name = "musb-blackfin",
586 .pm = DEV_PM_OPS,
587 },
588 };
590 MODULE_DESCRIPTION("Blackfin MUSB Glue Layer");
591 MODULE_AUTHOR("Bryan Wy <cooloney@kernel.org>");
592 MODULE_LICENSE("GPL v2");
594 static int __init bfin_init(void)
595 {
596 return platform_driver_probe(&bfin_driver, bfin_probe);
597 }
598 subsys_initcall(bfin_init);
600 static void __exit bfin_exit(void)
601 {
602 platform_driver_unregister(&bfin_driver);
603 }
604 module_exit(bfin_exit);