1 /*
2 * amd5536.c -- AMD 5536 UDC high/full speed USB device controller
3 *
4 * Copyright (C) 2005-2007 AMD (http://www.amd.com)
5 * Author: Thomas Dahlmann
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 as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13 /*
14 * The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536.
15 * It is a USB Highspeed DMA capable USB device controller. Beside ep0 it
16 * provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
17 *
18 * Make sure that UDC is assigned to port 4 by BIOS settings (port can also
19 * be used as host port) and UOC bits PAD_EN and APU are set (should be done
20 * by BIOS init).
21 *
22 * UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not
23 * work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0")
24 * can be used with gadget ether.
25 */
26
27 /* debug control */
28 /* #define UDC_VERBOSE */
29
30 /* Driver strings */
31 #define UDC_MOD_DESCRIPTION "AMD 5536 UDC - USB Device Controller"
32 #define UDC_DRIVER_VERSION_STRING "01.00.0206"
33
34 /* system */
35 #include <linux/module.h>
36 #include <linux/pci.h>
37 #include <linux/kernel.h>
38 #include <linux/delay.h>
39 #include <linux/ioport.h>
40 #include <linux/sched.h>
41 #include <linux/slab.h>
42 #include <linux/errno.h>
43 #include <linux/timer.h>
44 #include <linux/list.h>
45 #include <linux/interrupt.h>
46 #include <linux/ioctl.h>
47 #include <linux/fs.h>
48 #include <linux/dmapool.h>
49 #include <linux/moduleparam.h>
50 #include <linux/device.h>
51 #include <linux/io.h>
52 #include <linux/irq.h>
53 #include <linux/prefetch.h>
54
55 #include <asm/byteorder.h>
56 #include <asm/unaligned.h>
57
58 /* gadget stack */
59 #include <linux/usb/ch9.h>
60 #include <linux/usb/gadget.h>
61
62 /* udc specific */
63 #include "amd5536udc.h"
64
65
66 static void udc_tasklet_disconnect(unsigned long);
67 static void empty_req_queue(struct udc_ep *);
68 static void udc_setup_endpoints(struct udc *dev);
69 static void udc_soft_reset(struct udc *dev);
70 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep);
71 static void udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq);
72
73 /* description */
74 static const char mod_desc[] = UDC_MOD_DESCRIPTION;
75 static const char name[] = "amd5536udc";
76
77 /* structure to hold endpoint function pointers */
78 static const struct usb_ep_ops udc_ep_ops;
79
80 /* received setup data */
81 static union udc_setup_data setup_data;
82
83 /* pointer to device object */
84 static struct udc *udc;
85
86 /* irq spin lock for soft reset */
87 static DEFINE_SPINLOCK(udc_irq_spinlock);
88 /* stall spin lock */
89 static DEFINE_SPINLOCK(udc_stall_spinlock);
90
91 /*
92 * slave mode: pending bytes in rx fifo after nyet,
93 * used if EPIN irq came but no req was available
94 */
95 static unsigned int udc_rxfifo_pending;
96
97 /* count soft resets after suspend to avoid loop */
98 static int soft_reset_occured;
99 static int soft_reset_after_usbreset_occured;
100
101 /* timer */
102 static struct timer_list udc_timer;
103 static int stop_timer;
104
105 /* set_rde -- Is used to control enabling of RX DMA. Problem is
106 * that UDC has only one bit (RDE) to enable/disable RX DMA for
107 * all OUT endpoints. So we have to handle race conditions like
108 * when OUT data reaches the fifo but no request was queued yet.
109 * This cannot be solved by letting the RX DMA disabled until a
110 * request gets queued because there may be other OUT packets
111 * in the FIFO (important for not blocking control traffic).
112 * The value of set_rde controls the correspondig timer.
113 *
114 * set_rde -1 == not used, means it is alloed to be set to 0 or 1
115 * set_rde 0 == do not touch RDE, do no start the RDE timer
116 * set_rde 1 == timer function will look whether FIFO has data
117 * set_rde 2 == set by timer function to enable RX DMA on next call
118 */
119 static int set_rde = -1;
120
121 static DECLARE_COMPLETION(on_exit);
122 static struct timer_list udc_pollstall_timer;
123 static int stop_pollstall_timer;
124 static DECLARE_COMPLETION(on_pollstall_exit);
125
126 /* tasklet for usb disconnect */
127 static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect,
128 (unsigned long) &udc);
129
130
131 /* endpoint names used for print */
132 static const char ep0_string[] = "ep0in";
133 static const struct {
134 const char *name;
135 const struct usb_ep_caps caps;
136 } ep_info[] = {
137 #define EP_INFO(_name, _caps) \
138 { \
139 .name = _name, \
140 .caps = _caps, \
141 }
142
143 EP_INFO(ep0_string,
144 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_IN)),
145 EP_INFO("ep1in-int",
146 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
147 EP_INFO("ep2in-bulk",
148 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
149 EP_INFO("ep3in-bulk",
150 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
151 EP_INFO("ep4in-bulk",
152 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
153 EP_INFO("ep5in-bulk",
154 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
155 EP_INFO("ep6in-bulk",
156 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
157 EP_INFO("ep7in-bulk",
158 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
159 EP_INFO("ep8in-bulk",
160 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
161 EP_INFO("ep9in-bulk",
162 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
163 EP_INFO("ep10in-bulk",
164 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
165 EP_INFO("ep11in-bulk",
166 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
167 EP_INFO("ep12in-bulk",
168 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
169 EP_INFO("ep13in-bulk",
170 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
171 EP_INFO("ep14in-bulk",
172 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
173 EP_INFO("ep15in-bulk",
174 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
175 EP_INFO("ep0out",
176 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_OUT)),
177 EP_INFO("ep1out-bulk",
178 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
179 EP_INFO("ep2out-bulk",
180 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
181 EP_INFO("ep3out-bulk",
182 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
183 EP_INFO("ep4out-bulk",
184 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
185 EP_INFO("ep5out-bulk",
186 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
187 EP_INFO("ep6out-bulk",
188 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
189 EP_INFO("ep7out-bulk",
190 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
191 EP_INFO("ep8out-bulk",
192 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
193 EP_INFO("ep9out-bulk",
194 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
195 EP_INFO("ep10out-bulk",
196 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
197 EP_INFO("ep11out-bulk",
198 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
199 EP_INFO("ep12out-bulk",
200 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
201 EP_INFO("ep13out-bulk",
202 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
203 EP_INFO("ep14out-bulk",
204 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
205 EP_INFO("ep15out-bulk",
206 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
207
208 #undef EP_INFO
209 };
210
211 /* DMA usage flag */
212 static bool use_dma = 1;
213 /* packet per buffer dma */
214 static bool use_dma_ppb = 1;
215 /* with per descr. update */
216 static bool use_dma_ppb_du;
217 /* buffer fill mode */
218 static int use_dma_bufferfill_mode;
219 /* full speed only mode */
220 static bool use_fullspeed;
221 /* tx buffer size for high speed */
222 static unsigned long hs_tx_buf = UDC_EPIN_BUFF_SIZE;
223
224 /* module parameters */
225 module_param(use_dma, bool, S_IRUGO);
226 MODULE_PARM_DESC(use_dma, "true for DMA");
227 module_param(use_dma_ppb, bool, S_IRUGO);
228 MODULE_PARM_DESC(use_dma_ppb, "true for DMA in packet per buffer mode");
229 module_param(use_dma_ppb_du, bool, S_IRUGO);
230 MODULE_PARM_DESC(use_dma_ppb_du,
231 "true for DMA in packet per buffer mode with descriptor update");
232 module_param(use_fullspeed, bool, S_IRUGO);
233 MODULE_PARM_DESC(use_fullspeed, "true for fullspeed only");
234
235 /*---------------------------------------------------------------------------*/
236 /* Prints UDC device registers and endpoint irq registers */
print_regs(struct udc * dev)237 static void print_regs(struct udc *dev)
238 {
239 DBG(dev, "------- Device registers -------\n");
240 DBG(dev, "dev config = %08x\n", readl(&dev->regs->cfg));
241 DBG(dev, "dev control = %08x\n", readl(&dev->regs->ctl));
242 DBG(dev, "dev status = %08x\n", readl(&dev->regs->sts));
243 DBG(dev, "\n");
244 DBG(dev, "dev int's = %08x\n", readl(&dev->regs->irqsts));
245 DBG(dev, "dev intmask = %08x\n", readl(&dev->regs->irqmsk));
246 DBG(dev, "\n");
247 DBG(dev, "dev ep int's = %08x\n", readl(&dev->regs->ep_irqsts));
248 DBG(dev, "dev ep intmask = %08x\n", readl(&dev->regs->ep_irqmsk));
249 DBG(dev, "\n");
250 DBG(dev, "USE DMA = %d\n", use_dma);
251 if (use_dma && use_dma_ppb && !use_dma_ppb_du) {
252 DBG(dev, "DMA mode = PPBNDU (packet per buffer "
253 "WITHOUT desc. update)\n");
254 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBNDU");
255 } else if (use_dma && use_dma_ppb && use_dma_ppb_du) {
256 DBG(dev, "DMA mode = PPBDU (packet per buffer "
257 "WITH desc. update)\n");
258 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBDU");
259 }
260 if (use_dma && use_dma_bufferfill_mode) {
261 DBG(dev, "DMA mode = BF (buffer fill mode)\n");
262 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "BF");
263 }
264 if (!use_dma)
265 dev_info(&dev->pdev->dev, "FIFO mode\n");
266 DBG(dev, "-------------------------------------------------------\n");
267 }
268
269 /* Masks unused interrupts */
udc_mask_unused_interrupts(struct udc * dev)270 static int udc_mask_unused_interrupts(struct udc *dev)
271 {
272 u32 tmp;
273
274 /* mask all dev interrupts */
275 tmp = AMD_BIT(UDC_DEVINT_SVC) |
276 AMD_BIT(UDC_DEVINT_ENUM) |
277 AMD_BIT(UDC_DEVINT_US) |
278 AMD_BIT(UDC_DEVINT_UR) |
279 AMD_BIT(UDC_DEVINT_ES) |
280 AMD_BIT(UDC_DEVINT_SI) |
281 AMD_BIT(UDC_DEVINT_SOF)|
282 AMD_BIT(UDC_DEVINT_SC);
283 writel(tmp, &dev->regs->irqmsk);
284
285 /* mask all ep interrupts */
286 writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqmsk);
287
288 return 0;
289 }
290
291 /* Enables endpoint 0 interrupts */
udc_enable_ep0_interrupts(struct udc * dev)292 static int udc_enable_ep0_interrupts(struct udc *dev)
293 {
294 u32 tmp;
295
296 DBG(dev, "udc_enable_ep0_interrupts()\n");
297
298 /* read irq mask */
299 tmp = readl(&dev->regs->ep_irqmsk);
300 /* enable ep0 irq's */
301 tmp &= AMD_UNMASK_BIT(UDC_EPINT_IN_EP0)
302 & AMD_UNMASK_BIT(UDC_EPINT_OUT_EP0);
303 writel(tmp, &dev->regs->ep_irqmsk);
304
305 return 0;
306 }
307
308 /* Enables device interrupts for SET_INTF and SET_CONFIG */
udc_enable_dev_setup_interrupts(struct udc * dev)309 static int udc_enable_dev_setup_interrupts(struct udc *dev)
310 {
311 u32 tmp;
312
313 DBG(dev, "enable device interrupts for setup data\n");
314
315 /* read irq mask */
316 tmp = readl(&dev->regs->irqmsk);
317
318 /* enable SET_INTERFACE, SET_CONFIG and other needed irq's */
319 tmp &= AMD_UNMASK_BIT(UDC_DEVINT_SI)
320 & AMD_UNMASK_BIT(UDC_DEVINT_SC)
321 & AMD_UNMASK_BIT(UDC_DEVINT_UR)
322 & AMD_UNMASK_BIT(UDC_DEVINT_SVC)
323 & AMD_UNMASK_BIT(UDC_DEVINT_ENUM);
324 writel(tmp, &dev->regs->irqmsk);
325
326 return 0;
327 }
328
329 /* Calculates fifo start of endpoint based on preceding endpoints */
udc_set_txfifo_addr(struct udc_ep * ep)330 static int udc_set_txfifo_addr(struct udc_ep *ep)
331 {
332 struct udc *dev;
333 u32 tmp;
334 int i;
335
336 if (!ep || !(ep->in))
337 return -EINVAL;
338
339 dev = ep->dev;
340 ep->txfifo = dev->txfifo;
341
342 /* traverse ep's */
343 for (i = 0; i < ep->num; i++) {
344 if (dev->ep[i].regs) {
345 /* read fifo size */
346 tmp = readl(&dev->ep[i].regs->bufin_framenum);
347 tmp = AMD_GETBITS(tmp, UDC_EPIN_BUFF_SIZE);
348 ep->txfifo += tmp;
349 }
350 }
351 return 0;
352 }
353
354 /* CNAK pending field: bit0 = ep0in, bit16 = ep0out */
355 static u32 cnak_pending;
356
UDC_QUEUE_CNAK(struct udc_ep * ep,unsigned num)357 static void UDC_QUEUE_CNAK(struct udc_ep *ep, unsigned num)
358 {
359 if (readl(&ep->regs->ctl) & AMD_BIT(UDC_EPCTL_NAK)) {
360 DBG(ep->dev, "NAK could not be cleared for ep%d\n", num);
361 cnak_pending |= 1 << (num);
362 ep->naking = 1;
363 } else
364 cnak_pending = cnak_pending & (~(1 << (num)));
365 }
366
367
368 /* Enables endpoint, is called by gadget driver */
369 static int
udc_ep_enable(struct usb_ep * usbep,const struct usb_endpoint_descriptor * desc)370 udc_ep_enable(struct usb_ep *usbep, const struct usb_endpoint_descriptor *desc)
371 {
372 struct udc_ep *ep;
373 struct udc *dev;
374 u32 tmp;
375 unsigned long iflags;
376 u8 udc_csr_epix;
377 unsigned maxpacket;
378
379 if (!usbep
380 || usbep->name == ep0_string
381 || !desc
382 || desc->bDescriptorType != USB_DT_ENDPOINT)
383 return -EINVAL;
384
385 ep = container_of(usbep, struct udc_ep, ep);
386 dev = ep->dev;
387
388 DBG(dev, "udc_ep_enable() ep %d\n", ep->num);
389
390 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
391 return -ESHUTDOWN;
392
393 spin_lock_irqsave(&dev->lock, iflags);
394 ep->ep.desc = desc;
395
396 ep->halted = 0;
397
398 /* set traffic type */
399 tmp = readl(&dev->ep[ep->num].regs->ctl);
400 tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_EPCTL_ET);
401 writel(tmp, &dev->ep[ep->num].regs->ctl);
402
403 /* set max packet size */
404 maxpacket = usb_endpoint_maxp(desc);
405 tmp = readl(&dev->ep[ep->num].regs->bufout_maxpkt);
406 tmp = AMD_ADDBITS(tmp, maxpacket, UDC_EP_MAX_PKT_SIZE);
407 ep->ep.maxpacket = maxpacket;
408 writel(tmp, &dev->ep[ep->num].regs->bufout_maxpkt);
409
410 /* IN ep */
411 if (ep->in) {
412
413 /* ep ix in UDC CSR register space */
414 udc_csr_epix = ep->num;
415
416 /* set buffer size (tx fifo entries) */
417 tmp = readl(&dev->ep[ep->num].regs->bufin_framenum);
418 /* double buffering: fifo size = 2 x max packet size */
419 tmp = AMD_ADDBITS(
420 tmp,
421 maxpacket * UDC_EPIN_BUFF_SIZE_MULT
422 / UDC_DWORD_BYTES,
423 UDC_EPIN_BUFF_SIZE);
424 writel(tmp, &dev->ep[ep->num].regs->bufin_framenum);
425
426 /* calc. tx fifo base addr */
427 udc_set_txfifo_addr(ep);
428
429 /* flush fifo */
430 tmp = readl(&ep->regs->ctl);
431 tmp |= AMD_BIT(UDC_EPCTL_F);
432 writel(tmp, &ep->regs->ctl);
433
434 /* OUT ep */
435 } else {
436 /* ep ix in UDC CSR register space */
437 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
438
439 /* set max packet size UDC CSR */
440 tmp = readl(&dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
441 tmp = AMD_ADDBITS(tmp, maxpacket,
442 UDC_CSR_NE_MAX_PKT);
443 writel(tmp, &dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
444
445 if (use_dma && !ep->in) {
446 /* alloc and init BNA dummy request */
447 ep->bna_dummy_req = udc_alloc_bna_dummy(ep);
448 ep->bna_occurred = 0;
449 }
450
451 if (ep->num != UDC_EP0OUT_IX)
452 dev->data_ep_enabled = 1;
453 }
454
455 /* set ep values */
456 tmp = readl(&dev->csr->ne[udc_csr_epix]);
457 /* max packet */
458 tmp = AMD_ADDBITS(tmp, maxpacket, UDC_CSR_NE_MAX_PKT);
459 /* ep number */
460 tmp = AMD_ADDBITS(tmp, desc->bEndpointAddress, UDC_CSR_NE_NUM);
461 /* ep direction */
462 tmp = AMD_ADDBITS(tmp, ep->in, UDC_CSR_NE_DIR);
463 /* ep type */
464 tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_CSR_NE_TYPE);
465 /* ep config */
466 tmp = AMD_ADDBITS(tmp, ep->dev->cur_config, UDC_CSR_NE_CFG);
467 /* ep interface */
468 tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf, UDC_CSR_NE_INTF);
469 /* ep alt */
470 tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt, UDC_CSR_NE_ALT);
471 /* write reg */
472 writel(tmp, &dev->csr->ne[udc_csr_epix]);
473
474 /* enable ep irq */
475 tmp = readl(&dev->regs->ep_irqmsk);
476 tmp &= AMD_UNMASK_BIT(ep->num);
477 writel(tmp, &dev->regs->ep_irqmsk);
478
479 /*
480 * clear NAK by writing CNAK
481 * avoid BNA for OUT DMA, don't clear NAK until DMA desc. written
482 */
483 if (!use_dma || ep->in) {
484 tmp = readl(&ep->regs->ctl);
485 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
486 writel(tmp, &ep->regs->ctl);
487 ep->naking = 0;
488 UDC_QUEUE_CNAK(ep, ep->num);
489 }
490 tmp = desc->bEndpointAddress;
491 DBG(dev, "%s enabled\n", usbep->name);
492
493 spin_unlock_irqrestore(&dev->lock, iflags);
494 return 0;
495 }
496
497 /* Resets endpoint */
ep_init(struct udc_regs __iomem * regs,struct udc_ep * ep)498 static void ep_init(struct udc_regs __iomem *regs, struct udc_ep *ep)
499 {
500 u32 tmp;
501
502 VDBG(ep->dev, "ep-%d reset\n", ep->num);
503 ep->ep.desc = NULL;
504 ep->ep.ops = &udc_ep_ops;
505 INIT_LIST_HEAD(&ep->queue);
506
507 usb_ep_set_maxpacket_limit(&ep->ep,(u16) ~0);
508 /* set NAK */
509 tmp = readl(&ep->regs->ctl);
510 tmp |= AMD_BIT(UDC_EPCTL_SNAK);
511 writel(tmp, &ep->regs->ctl);
512 ep->naking = 1;
513
514 /* disable interrupt */
515 tmp = readl(®s->ep_irqmsk);
516 tmp |= AMD_BIT(ep->num);
517 writel(tmp, ®s->ep_irqmsk);
518
519 if (ep->in) {
520 /* unset P and IN bit of potential former DMA */
521 tmp = readl(&ep->regs->ctl);
522 tmp &= AMD_UNMASK_BIT(UDC_EPCTL_P);
523 writel(tmp, &ep->regs->ctl);
524
525 tmp = readl(&ep->regs->sts);
526 tmp |= AMD_BIT(UDC_EPSTS_IN);
527 writel(tmp, &ep->regs->sts);
528
529 /* flush the fifo */
530 tmp = readl(&ep->regs->ctl);
531 tmp |= AMD_BIT(UDC_EPCTL_F);
532 writel(tmp, &ep->regs->ctl);
533
534 }
535 /* reset desc pointer */
536 writel(0, &ep->regs->desptr);
537 }
538
539 /* Disables endpoint, is called by gadget driver */
udc_ep_disable(struct usb_ep * usbep)540 static int udc_ep_disable(struct usb_ep *usbep)
541 {
542 struct udc_ep *ep = NULL;
543 unsigned long iflags;
544
545 if (!usbep)
546 return -EINVAL;
547
548 ep = container_of(usbep, struct udc_ep, ep);
549 if (usbep->name == ep0_string || !ep->ep.desc)
550 return -EINVAL;
551
552 DBG(ep->dev, "Disable ep-%d\n", ep->num);
553
554 spin_lock_irqsave(&ep->dev->lock, iflags);
555 udc_free_request(&ep->ep, &ep->bna_dummy_req->req);
556 empty_req_queue(ep);
557 ep_init(ep->dev->regs, ep);
558 spin_unlock_irqrestore(&ep->dev->lock, iflags);
559
560 return 0;
561 }
562
563 /* Allocates request packet, called by gadget driver */
564 static struct usb_request *
udc_alloc_request(struct usb_ep * usbep,gfp_t gfp)565 udc_alloc_request(struct usb_ep *usbep, gfp_t gfp)
566 {
567 struct udc_request *req;
568 struct udc_data_dma *dma_desc;
569 struct udc_ep *ep;
570
571 if (!usbep)
572 return NULL;
573
574 ep = container_of(usbep, struct udc_ep, ep);
575
576 VDBG(ep->dev, "udc_alloc_req(): ep%d\n", ep->num);
577 req = kzalloc(sizeof(struct udc_request), gfp);
578 if (!req)
579 return NULL;
580
581 req->req.dma = DMA_DONT_USE;
582 INIT_LIST_HEAD(&req->queue);
583
584 if (ep->dma) {
585 /* ep0 in requests are allocated from data pool here */
586 dma_desc = pci_pool_alloc(ep->dev->data_requests, gfp,
587 &req->td_phys);
588 if (!dma_desc) {
589 kfree(req);
590 return NULL;
591 }
592
593 VDBG(ep->dev, "udc_alloc_req: req = %p dma_desc = %p, "
594 "td_phys = %lx\n",
595 req, dma_desc,
596 (unsigned long)req->td_phys);
597 /* prevent from using desc. - set HOST BUSY */
598 dma_desc->status = AMD_ADDBITS(dma_desc->status,
599 UDC_DMA_STP_STS_BS_HOST_BUSY,
600 UDC_DMA_STP_STS_BS);
601 dma_desc->bufptr = cpu_to_le32(DMA_DONT_USE);
602 req->td_data = dma_desc;
603 req->td_data_last = NULL;
604 req->chain_len = 1;
605 }
606
607 return &req->req;
608 }
609
610 /* frees pci pool descriptors of a DMA chain */
udc_free_dma_chain(struct udc * dev,struct udc_request * req)611 static int udc_free_dma_chain(struct udc *dev, struct udc_request *req)
612 {
613 int ret_val = 0;
614 struct udc_data_dma *td;
615 struct udc_data_dma *td_last = NULL;
616 unsigned int i;
617
618 DBG(dev, "free chain req = %p\n", req);
619
620 /* do not free first desc., will be done by free for request */
621 td_last = req->td_data;
622 td = phys_to_virt(td_last->next);
623
624 for (i = 1; i < req->chain_len; i++) {
625 pci_pool_free(dev->data_requests, td,
626 (dma_addr_t)td_last->next);
627 td_last = td;
628 td = phys_to_virt(td_last->next);
629 }
630
631 return ret_val;
632 }
633
634 /* Frees request packet, called by gadget driver */
635 static void
udc_free_request(struct usb_ep * usbep,struct usb_request * usbreq)636 udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq)
637 {
638 struct udc_ep *ep;
639 struct udc_request *req;
640
641 if (!usbep || !usbreq)
642 return;
643
644 ep = container_of(usbep, struct udc_ep, ep);
645 req = container_of(usbreq, struct udc_request, req);
646 VDBG(ep->dev, "free_req req=%p\n", req);
647 BUG_ON(!list_empty(&req->queue));
648 if (req->td_data) {
649 VDBG(ep->dev, "req->td_data=%p\n", req->td_data);
650
651 /* free dma chain if created */
652 if (req->chain_len > 1)
653 udc_free_dma_chain(ep->dev, req);
654
655 pci_pool_free(ep->dev->data_requests, req->td_data,
656 req->td_phys);
657 }
658 kfree(req);
659 }
660
661 /* Init BNA dummy descriptor for HOST BUSY and pointing to itself */
udc_init_bna_dummy(struct udc_request * req)662 static void udc_init_bna_dummy(struct udc_request *req)
663 {
664 if (req) {
665 /* set last bit */
666 req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
667 /* set next pointer to itself */
668 req->td_data->next = req->td_phys;
669 /* set HOST BUSY */
670 req->td_data->status
671 = AMD_ADDBITS(req->td_data->status,
672 UDC_DMA_STP_STS_BS_DMA_DONE,
673 UDC_DMA_STP_STS_BS);
674 #ifdef UDC_VERBOSE
675 pr_debug("bna desc = %p, sts = %08x\n",
676 req->td_data, req->td_data->status);
677 #endif
678 }
679 }
680
681 /* Allocate BNA dummy descriptor */
udc_alloc_bna_dummy(struct udc_ep * ep)682 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep)
683 {
684 struct udc_request *req = NULL;
685 struct usb_request *_req = NULL;
686
687 /* alloc the dummy request */
688 _req = udc_alloc_request(&ep->ep, GFP_ATOMIC);
689 if (_req) {
690 req = container_of(_req, struct udc_request, req);
691 ep->bna_dummy_req = req;
692 udc_init_bna_dummy(req);
693 }
694 return req;
695 }
696
697 /* Write data to TX fifo for IN packets */
698 static void
udc_txfifo_write(struct udc_ep * ep,struct usb_request * req)699 udc_txfifo_write(struct udc_ep *ep, struct usb_request *req)
700 {
701 u8 *req_buf;
702 u32 *buf;
703 int i, j;
704 unsigned bytes = 0;
705 unsigned remaining = 0;
706
707 if (!req || !ep)
708 return;
709
710 req_buf = req->buf + req->actual;
711 prefetch(req_buf);
712 remaining = req->length - req->actual;
713
714 buf = (u32 *) req_buf;
715
716 bytes = ep->ep.maxpacket;
717 if (bytes > remaining)
718 bytes = remaining;
719
720 /* dwords first */
721 for (i = 0; i < bytes / UDC_DWORD_BYTES; i++)
722 writel(*(buf + i), ep->txfifo);
723
724 /* remaining bytes must be written by byte access */
725 for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
726 writeb((u8)(*(buf + i) >> (j << UDC_BITS_PER_BYTE_SHIFT)),
727 ep->txfifo);
728 }
729
730 /* dummy write confirm */
731 writel(0, &ep->regs->confirm);
732 }
733
734 /* Read dwords from RX fifo for OUT transfers */
udc_rxfifo_read_dwords(struct udc * dev,u32 * buf,int dwords)735 static int udc_rxfifo_read_dwords(struct udc *dev, u32 *buf, int dwords)
736 {
737 int i;
738
739 VDBG(dev, "udc_read_dwords(): %d dwords\n", dwords);
740
741 for (i = 0; i < dwords; i++)
742 *(buf + i) = readl(dev->rxfifo);
743 return 0;
744 }
745
746 /* Read bytes from RX fifo for OUT transfers */
udc_rxfifo_read_bytes(struct udc * dev,u8 * buf,int bytes)747 static int udc_rxfifo_read_bytes(struct udc *dev, u8 *buf, int bytes)
748 {
749 int i, j;
750 u32 tmp;
751
752 VDBG(dev, "udc_read_bytes(): %d bytes\n", bytes);
753
754 /* dwords first */
755 for (i = 0; i < bytes / UDC_DWORD_BYTES; i++)
756 *((u32 *)(buf + (i<<2))) = readl(dev->rxfifo);
757
758 /* remaining bytes must be read by byte access */
759 if (bytes % UDC_DWORD_BYTES) {
760 tmp = readl(dev->rxfifo);
761 for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
762 *(buf + (i<<2) + j) = (u8)(tmp & UDC_BYTE_MASK);
763 tmp = tmp >> UDC_BITS_PER_BYTE;
764 }
765 }
766
767 return 0;
768 }
769
770 /* Read data from RX fifo for OUT transfers */
771 static int
udc_rxfifo_read(struct udc_ep * ep,struct udc_request * req)772 udc_rxfifo_read(struct udc_ep *ep, struct udc_request *req)
773 {
774 u8 *buf;
775 unsigned buf_space;
776 unsigned bytes = 0;
777 unsigned finished = 0;
778
779 /* received number bytes */
780 bytes = readl(&ep->regs->sts);
781 bytes = AMD_GETBITS(bytes, UDC_EPSTS_RX_PKT_SIZE);
782
783 buf_space = req->req.length - req->req.actual;
784 buf = req->req.buf + req->req.actual;
785 if (bytes > buf_space) {
786 if ((buf_space % ep->ep.maxpacket) != 0) {
787 DBG(ep->dev,
788 "%s: rx %d bytes, rx-buf space = %d bytesn\n",
789 ep->ep.name, bytes, buf_space);
790 req->req.status = -EOVERFLOW;
791 }
792 bytes = buf_space;
793 }
794 req->req.actual += bytes;
795
796 /* last packet ? */
797 if (((bytes % ep->ep.maxpacket) != 0) || (!bytes)
798 || ((req->req.actual == req->req.length) && !req->req.zero))
799 finished = 1;
800
801 /* read rx fifo bytes */
802 VDBG(ep->dev, "ep %s: rxfifo read %d bytes\n", ep->ep.name, bytes);
803 udc_rxfifo_read_bytes(ep->dev, buf, bytes);
804
805 return finished;
806 }
807
808 /* Creates or re-inits a DMA chain */
udc_create_dma_chain(struct udc_ep * ep,struct udc_request * req,unsigned long buf_len,gfp_t gfp_flags)809 static int udc_create_dma_chain(
810 struct udc_ep *ep,
811 struct udc_request *req,
812 unsigned long buf_len, gfp_t gfp_flags
813 )
814 {
815 unsigned long bytes = req->req.length;
816 unsigned int i;
817 dma_addr_t dma_addr;
818 struct udc_data_dma *td = NULL;
819 struct udc_data_dma *last = NULL;
820 unsigned long txbytes;
821 unsigned create_new_chain = 0;
822 unsigned len;
823
824 VDBG(ep->dev, "udc_create_dma_chain: bytes=%ld buf_len=%ld\n",
825 bytes, buf_len);
826 dma_addr = DMA_DONT_USE;
827
828 /* unset L bit in first desc for OUT */
829 if (!ep->in)
830 req->td_data->status &= AMD_CLEAR_BIT(UDC_DMA_IN_STS_L);
831
832 /* alloc only new desc's if not already available */
833 len = req->req.length / ep->ep.maxpacket;
834 if (req->req.length % ep->ep.maxpacket)
835 len++;
836
837 if (len > req->chain_len) {
838 /* shorter chain already allocated before */
839 if (req->chain_len > 1)
840 udc_free_dma_chain(ep->dev, req);
841 req->chain_len = len;
842 create_new_chain = 1;
843 }
844
845 td = req->td_data;
846 /* gen. required number of descriptors and buffers */
847 for (i = buf_len; i < bytes; i += buf_len) {
848 /* create or determine next desc. */
849 if (create_new_chain) {
850 td = pci_pool_alloc(ep->dev->data_requests,
851 gfp_flags, &dma_addr);
852 if (!td)
853 return -ENOMEM;
854
855 td->status = 0;
856 } else if (i == buf_len) {
857 /* first td */
858 td = (struct udc_data_dma *)phys_to_virt(
859 req->td_data->next);
860 td->status = 0;
861 } else {
862 td = (struct udc_data_dma *)phys_to_virt(last->next);
863 td->status = 0;
864 }
865
866 if (td)
867 td->bufptr = req->req.dma + i; /* assign buffer */
868 else
869 break;
870
871 /* short packet ? */
872 if ((bytes - i) >= buf_len) {
873 txbytes = buf_len;
874 } else {
875 /* short packet */
876 txbytes = bytes - i;
877 }
878
879 /* link td and assign tx bytes */
880 if (i == buf_len) {
881 if (create_new_chain)
882 req->td_data->next = dma_addr;
883 /*
884 * else
885 * req->td_data->next = virt_to_phys(td);
886 */
887 /* write tx bytes */
888 if (ep->in) {
889 /* first desc */
890 req->td_data->status =
891 AMD_ADDBITS(req->td_data->status,
892 ep->ep.maxpacket,
893 UDC_DMA_IN_STS_TXBYTES);
894 /* second desc */
895 td->status = AMD_ADDBITS(td->status,
896 txbytes,
897 UDC_DMA_IN_STS_TXBYTES);
898 }
899 } else {
900 if (create_new_chain)
901 last->next = dma_addr;
902 /*
903 * else
904 * last->next = virt_to_phys(td);
905 */
906 if (ep->in) {
907 /* write tx bytes */
908 td->status = AMD_ADDBITS(td->status,
909 txbytes,
910 UDC_DMA_IN_STS_TXBYTES);
911 }
912 }
913 last = td;
914 }
915 /* set last bit */
916 if (td) {
917 td->status |= AMD_BIT(UDC_DMA_IN_STS_L);
918 /* last desc. points to itself */
919 req->td_data_last = td;
920 }
921
922 return 0;
923 }
924
925 /* create/re-init a DMA descriptor or a DMA descriptor chain */
prep_dma(struct udc_ep * ep,struct udc_request * req,gfp_t gfp)926 static int prep_dma(struct udc_ep *ep, struct udc_request *req, gfp_t gfp)
927 {
928 int retval = 0;
929 u32 tmp;
930
931 VDBG(ep->dev, "prep_dma\n");
932 VDBG(ep->dev, "prep_dma ep%d req->td_data=%p\n",
933 ep->num, req->td_data);
934
935 /* set buffer pointer */
936 req->td_data->bufptr = req->req.dma;
937
938 /* set last bit */
939 req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
940
941 /* build/re-init dma chain if maxpkt scatter mode, not for EP0 */
942 if (use_dma_ppb) {
943
944 retval = udc_create_dma_chain(ep, req, ep->ep.maxpacket, gfp);
945 if (retval != 0) {
946 if (retval == -ENOMEM)
947 DBG(ep->dev, "Out of DMA memory\n");
948 return retval;
949 }
950 if (ep->in) {
951 if (req->req.length == ep->ep.maxpacket) {
952 /* write tx bytes */
953 req->td_data->status =
954 AMD_ADDBITS(req->td_data->status,
955 ep->ep.maxpacket,
956 UDC_DMA_IN_STS_TXBYTES);
957
958 }
959 }
960
961 }
962
963 if (ep->in) {
964 VDBG(ep->dev, "IN: use_dma_ppb=%d req->req.len=%d "
965 "maxpacket=%d ep%d\n",
966 use_dma_ppb, req->req.length,
967 ep->ep.maxpacket, ep->num);
968 /*
969 * if bytes < max packet then tx bytes must
970 * be written in packet per buffer mode
971 */
972 if (!use_dma_ppb || req->req.length < ep->ep.maxpacket
973 || ep->num == UDC_EP0OUT_IX
974 || ep->num == UDC_EP0IN_IX) {
975 /* write tx bytes */
976 req->td_data->status =
977 AMD_ADDBITS(req->td_data->status,
978 req->req.length,
979 UDC_DMA_IN_STS_TXBYTES);
980 /* reset frame num */
981 req->td_data->status =
982 AMD_ADDBITS(req->td_data->status,
983 0,
984 UDC_DMA_IN_STS_FRAMENUM);
985 }
986 /* set HOST BUSY */
987 req->td_data->status =
988 AMD_ADDBITS(req->td_data->status,
989 UDC_DMA_STP_STS_BS_HOST_BUSY,
990 UDC_DMA_STP_STS_BS);
991 } else {
992 VDBG(ep->dev, "OUT set host ready\n");
993 /* set HOST READY */
994 req->td_data->status =
995 AMD_ADDBITS(req->td_data->status,
996 UDC_DMA_STP_STS_BS_HOST_READY,
997 UDC_DMA_STP_STS_BS);
998
999
1000 /* clear NAK by writing CNAK */
1001 if (ep->naking) {
1002 tmp = readl(&ep->regs->ctl);
1003 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1004 writel(tmp, &ep->regs->ctl);
1005 ep->naking = 0;
1006 UDC_QUEUE_CNAK(ep, ep->num);
1007 }
1008
1009 }
1010
1011 return retval;
1012 }
1013
1014 /* Completes request packet ... caller MUST hold lock */
1015 static void
complete_req(struct udc_ep * ep,struct udc_request * req,int sts)1016 complete_req(struct udc_ep *ep, struct udc_request *req, int sts)
1017 __releases(ep->dev->lock)
1018 __acquires(ep->dev->lock)
1019 {
1020 struct udc *dev;
1021 unsigned halted;
1022
1023 VDBG(ep->dev, "complete_req(): ep%d\n", ep->num);
1024
1025 dev = ep->dev;
1026 /* unmap DMA */
1027 if (ep->dma)
1028 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->in);
1029
1030 halted = ep->halted;
1031 ep->halted = 1;
1032
1033 /* set new status if pending */
1034 if (req->req.status == -EINPROGRESS)
1035 req->req.status = sts;
1036
1037 /* remove from ep queue */
1038 list_del_init(&req->queue);
1039
1040 VDBG(ep->dev, "req %p => complete %d bytes at %s with sts %d\n",
1041 &req->req, req->req.length, ep->ep.name, sts);
1042
1043 spin_unlock(&dev->lock);
1044 usb_gadget_giveback_request(&ep->ep, &req->req);
1045 spin_lock(&dev->lock);
1046 ep->halted = halted;
1047 }
1048
1049 /* Iterates to the end of a DMA chain and returns last descriptor */
udc_get_last_dma_desc(struct udc_request * req)1050 static struct udc_data_dma *udc_get_last_dma_desc(struct udc_request *req)
1051 {
1052 struct udc_data_dma *td;
1053
1054 td = req->td_data;
1055 while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L)))
1056 td = phys_to_virt(td->next);
1057
1058 return td;
1059
1060 }
1061
1062 /* Iterates to the end of a DMA chain and counts bytes received */
udc_get_ppbdu_rxbytes(struct udc_request * req)1063 static u32 udc_get_ppbdu_rxbytes(struct udc_request *req)
1064 {
1065 struct udc_data_dma *td;
1066 u32 count;
1067
1068 td = req->td_data;
1069 /* received number bytes */
1070 count = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_RXBYTES);
1071
1072 while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) {
1073 td = phys_to_virt(td->next);
1074 /* received number bytes */
1075 if (td) {
1076 count += AMD_GETBITS(td->status,
1077 UDC_DMA_OUT_STS_RXBYTES);
1078 }
1079 }
1080
1081 return count;
1082
1083 }
1084
1085 /* Enabling RX DMA */
udc_set_rde(struct udc * dev)1086 static void udc_set_rde(struct udc *dev)
1087 {
1088 u32 tmp;
1089
1090 VDBG(dev, "udc_set_rde()\n");
1091 /* stop RDE timer */
1092 if (timer_pending(&udc_timer)) {
1093 set_rde = 0;
1094 mod_timer(&udc_timer, jiffies - 1);
1095 }
1096 /* set RDE */
1097 tmp = readl(&dev->regs->ctl);
1098 tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1099 writel(tmp, &dev->regs->ctl);
1100 }
1101
1102 /* Queues a request packet, called by gadget driver */
1103 static int
udc_queue(struct usb_ep * usbep,struct usb_request * usbreq,gfp_t gfp)1104 udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
1105 {
1106 int retval = 0;
1107 u8 open_rxfifo = 0;
1108 unsigned long iflags;
1109 struct udc_ep *ep;
1110 struct udc_request *req;
1111 struct udc *dev;
1112 u32 tmp;
1113
1114 /* check the inputs */
1115 req = container_of(usbreq, struct udc_request, req);
1116
1117 if (!usbep || !usbreq || !usbreq->complete || !usbreq->buf
1118 || !list_empty(&req->queue))
1119 return -EINVAL;
1120
1121 ep = container_of(usbep, struct udc_ep, ep);
1122 if (!ep->ep.desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1123 return -EINVAL;
1124
1125 VDBG(ep->dev, "udc_queue(): ep%d-in=%d\n", ep->num, ep->in);
1126 dev = ep->dev;
1127
1128 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
1129 return -ESHUTDOWN;
1130
1131 /* map dma (usually done before) */
1132 if (ep->dma) {
1133 VDBG(dev, "DMA map req %p\n", req);
1134 retval = usb_gadget_map_request(&udc->gadget, usbreq, ep->in);
1135 if (retval)
1136 return retval;
1137 }
1138
1139 VDBG(dev, "%s queue req %p, len %d req->td_data=%p buf %p\n",
1140 usbep->name, usbreq, usbreq->length,
1141 req->td_data, usbreq->buf);
1142
1143 spin_lock_irqsave(&dev->lock, iflags);
1144 usbreq->actual = 0;
1145 usbreq->status = -EINPROGRESS;
1146 req->dma_done = 0;
1147
1148 /* on empty queue just do first transfer */
1149 if (list_empty(&ep->queue)) {
1150 /* zlp */
1151 if (usbreq->length == 0) {
1152 /* IN zlp's are handled by hardware */
1153 complete_req(ep, req, 0);
1154 VDBG(dev, "%s: zlp\n", ep->ep.name);
1155 /*
1156 * if set_config or set_intf is waiting for ack by zlp
1157 * then set CSR_DONE
1158 */
1159 if (dev->set_cfg_not_acked) {
1160 tmp = readl(&dev->regs->ctl);
1161 tmp |= AMD_BIT(UDC_DEVCTL_CSR_DONE);
1162 writel(tmp, &dev->regs->ctl);
1163 dev->set_cfg_not_acked = 0;
1164 }
1165 /* setup command is ACK'ed now by zlp */
1166 if (dev->waiting_zlp_ack_ep0in) {
1167 /* clear NAK by writing CNAK in EP0_IN */
1168 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1169 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1170 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1171 dev->ep[UDC_EP0IN_IX].naking = 0;
1172 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX],
1173 UDC_EP0IN_IX);
1174 dev->waiting_zlp_ack_ep0in = 0;
1175 }
1176 goto finished;
1177 }
1178 if (ep->dma) {
1179 retval = prep_dma(ep, req, GFP_ATOMIC);
1180 if (retval != 0)
1181 goto finished;
1182 /* write desc pointer to enable DMA */
1183 if (ep->in) {
1184 /* set HOST READY */
1185 req->td_data->status =
1186 AMD_ADDBITS(req->td_data->status,
1187 UDC_DMA_IN_STS_BS_HOST_READY,
1188 UDC_DMA_IN_STS_BS);
1189 }
1190
1191 /* disabled rx dma while descriptor update */
1192 if (!ep->in) {
1193 /* stop RDE timer */
1194 if (timer_pending(&udc_timer)) {
1195 set_rde = 0;
1196 mod_timer(&udc_timer, jiffies - 1);
1197 }
1198 /* clear RDE */
1199 tmp = readl(&dev->regs->ctl);
1200 tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1201 writel(tmp, &dev->regs->ctl);
1202 open_rxfifo = 1;
1203
1204 /*
1205 * if BNA occurred then let BNA dummy desc.
1206 * point to current desc.
1207 */
1208 if (ep->bna_occurred) {
1209 VDBG(dev, "copy to BNA dummy desc.\n");
1210 memcpy(ep->bna_dummy_req->td_data,
1211 req->td_data,
1212 sizeof(struct udc_data_dma));
1213 }
1214 }
1215 /* write desc pointer */
1216 writel(req->td_phys, &ep->regs->desptr);
1217
1218 /* clear NAK by writing CNAK */
1219 if (ep->naking) {
1220 tmp = readl(&ep->regs->ctl);
1221 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1222 writel(tmp, &ep->regs->ctl);
1223 ep->naking = 0;
1224 UDC_QUEUE_CNAK(ep, ep->num);
1225 }
1226
1227 if (ep->in) {
1228 /* enable ep irq */
1229 tmp = readl(&dev->regs->ep_irqmsk);
1230 tmp &= AMD_UNMASK_BIT(ep->num);
1231 writel(tmp, &dev->regs->ep_irqmsk);
1232 }
1233 } else if (ep->in) {
1234 /* enable ep irq */
1235 tmp = readl(&dev->regs->ep_irqmsk);
1236 tmp &= AMD_UNMASK_BIT(ep->num);
1237 writel(tmp, &dev->regs->ep_irqmsk);
1238 }
1239
1240 } else if (ep->dma) {
1241
1242 /*
1243 * prep_dma not used for OUT ep's, this is not possible
1244 * for PPB modes, because of chain creation reasons
1245 */
1246 if (ep->in) {
1247 retval = prep_dma(ep, req, GFP_ATOMIC);
1248 if (retval != 0)
1249 goto finished;
1250 }
1251 }
1252 VDBG(dev, "list_add\n");
1253 /* add request to ep queue */
1254 if (req) {
1255
1256 list_add_tail(&req->queue, &ep->queue);
1257
1258 /* open rxfifo if out data queued */
1259 if (open_rxfifo) {
1260 /* enable DMA */
1261 req->dma_going = 1;
1262 udc_set_rde(dev);
1263 if (ep->num != UDC_EP0OUT_IX)
1264 dev->data_ep_queued = 1;
1265 }
1266 /* stop OUT naking */
1267 if (!ep->in) {
1268 if (!use_dma && udc_rxfifo_pending) {
1269 DBG(dev, "udc_queue(): pending bytes in "
1270 "rxfifo after nyet\n");
1271 /*
1272 * read pending bytes afer nyet:
1273 * referring to isr
1274 */
1275 if (udc_rxfifo_read(ep, req)) {
1276 /* finish */
1277 complete_req(ep, req, 0);
1278 }
1279 udc_rxfifo_pending = 0;
1280
1281 }
1282 }
1283 }
1284
1285 finished:
1286 spin_unlock_irqrestore(&dev->lock, iflags);
1287 return retval;
1288 }
1289
1290 /* Empty request queue of an endpoint; caller holds spinlock */
empty_req_queue(struct udc_ep * ep)1291 static void empty_req_queue(struct udc_ep *ep)
1292 {
1293 struct udc_request *req;
1294
1295 ep->halted = 1;
1296 while (!list_empty(&ep->queue)) {
1297 req = list_entry(ep->queue.next,
1298 struct udc_request,
1299 queue);
1300 complete_req(ep, req, -ESHUTDOWN);
1301 }
1302 }
1303
1304 /* Dequeues a request packet, called by gadget driver */
udc_dequeue(struct usb_ep * usbep,struct usb_request * usbreq)1305 static int udc_dequeue(struct usb_ep *usbep, struct usb_request *usbreq)
1306 {
1307 struct udc_ep *ep;
1308 struct udc_request *req;
1309 unsigned halted;
1310 unsigned long iflags;
1311
1312 ep = container_of(usbep, struct udc_ep, ep);
1313 if (!usbep || !usbreq || (!ep->ep.desc && (ep->num != 0
1314 && ep->num != UDC_EP0OUT_IX)))
1315 return -EINVAL;
1316
1317 req = container_of(usbreq, struct udc_request, req);
1318
1319 spin_lock_irqsave(&ep->dev->lock, iflags);
1320 halted = ep->halted;
1321 ep->halted = 1;
1322 /* request in processing or next one */
1323 if (ep->queue.next == &req->queue) {
1324 if (ep->dma && req->dma_going) {
1325 if (ep->in)
1326 ep->cancel_transfer = 1;
1327 else {
1328 u32 tmp;
1329 u32 dma_sts;
1330 /* stop potential receive DMA */
1331 tmp = readl(&udc->regs->ctl);
1332 writel(tmp & AMD_UNMASK_BIT(UDC_DEVCTL_RDE),
1333 &udc->regs->ctl);
1334 /*
1335 * Cancel transfer later in ISR
1336 * if descriptor was touched.
1337 */
1338 dma_sts = AMD_GETBITS(req->td_data->status,
1339 UDC_DMA_OUT_STS_BS);
1340 if (dma_sts != UDC_DMA_OUT_STS_BS_HOST_READY)
1341 ep->cancel_transfer = 1;
1342 else {
1343 udc_init_bna_dummy(ep->req);
1344 writel(ep->bna_dummy_req->td_phys,
1345 &ep->regs->desptr);
1346 }
1347 writel(tmp, &udc->regs->ctl);
1348 }
1349 }
1350 }
1351 complete_req(ep, req, -ECONNRESET);
1352 ep->halted = halted;
1353
1354 spin_unlock_irqrestore(&ep->dev->lock, iflags);
1355 return 0;
1356 }
1357
1358 /* Halt or clear halt of endpoint */
1359 static int
udc_set_halt(struct usb_ep * usbep,int halt)1360 udc_set_halt(struct usb_ep *usbep, int halt)
1361 {
1362 struct udc_ep *ep;
1363 u32 tmp;
1364 unsigned long iflags;
1365 int retval = 0;
1366
1367 if (!usbep)
1368 return -EINVAL;
1369
1370 pr_debug("set_halt %s: halt=%d\n", usbep->name, halt);
1371
1372 ep = container_of(usbep, struct udc_ep, ep);
1373 if (!ep->ep.desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1374 return -EINVAL;
1375 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1376 return -ESHUTDOWN;
1377
1378 spin_lock_irqsave(&udc_stall_spinlock, iflags);
1379 /* halt or clear halt */
1380 if (halt) {
1381 if (ep->num == 0)
1382 ep->dev->stall_ep0in = 1;
1383 else {
1384 /*
1385 * set STALL
1386 * rxfifo empty not taken into acount
1387 */
1388 tmp = readl(&ep->regs->ctl);
1389 tmp |= AMD_BIT(UDC_EPCTL_S);
1390 writel(tmp, &ep->regs->ctl);
1391 ep->halted = 1;
1392
1393 /* setup poll timer */
1394 if (!timer_pending(&udc_pollstall_timer)) {
1395 udc_pollstall_timer.expires = jiffies +
1396 HZ * UDC_POLLSTALL_TIMER_USECONDS
1397 / (1000 * 1000);
1398 if (!stop_pollstall_timer) {
1399 DBG(ep->dev, "start polltimer\n");
1400 add_timer(&udc_pollstall_timer);
1401 }
1402 }
1403 }
1404 } else {
1405 /* ep is halted by set_halt() before */
1406 if (ep->halted) {
1407 tmp = readl(&ep->regs->ctl);
1408 /* clear stall bit */
1409 tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
1410 /* clear NAK by writing CNAK */
1411 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1412 writel(tmp, &ep->regs->ctl);
1413 ep->halted = 0;
1414 UDC_QUEUE_CNAK(ep, ep->num);
1415 }
1416 }
1417 spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
1418 return retval;
1419 }
1420
1421 /* gadget interface */
1422 static const struct usb_ep_ops udc_ep_ops = {
1423 .enable = udc_ep_enable,
1424 .disable = udc_ep_disable,
1425
1426 .alloc_request = udc_alloc_request,
1427 .free_request = udc_free_request,
1428
1429 .queue = udc_queue,
1430 .dequeue = udc_dequeue,
1431
1432 .set_halt = udc_set_halt,
1433 /* fifo ops not implemented */
1434 };
1435
1436 /*-------------------------------------------------------------------------*/
1437
1438 /* Get frame counter (not implemented) */
udc_get_frame(struct usb_gadget * gadget)1439 static int udc_get_frame(struct usb_gadget *gadget)
1440 {
1441 return -EOPNOTSUPP;
1442 }
1443
1444 /* Initiates a remote wakeup */
udc_remote_wakeup(struct udc * dev)1445 static int udc_remote_wakeup(struct udc *dev)
1446 {
1447 unsigned long flags;
1448 u32 tmp;
1449
1450 DBG(dev, "UDC initiates remote wakeup\n");
1451
1452 spin_lock_irqsave(&dev->lock, flags);
1453
1454 tmp = readl(&dev->regs->ctl);
1455 tmp |= AMD_BIT(UDC_DEVCTL_RES);
1456 writel(tmp, &dev->regs->ctl);
1457 tmp &= AMD_CLEAR_BIT(UDC_DEVCTL_RES);
1458 writel(tmp, &dev->regs->ctl);
1459
1460 spin_unlock_irqrestore(&dev->lock, flags);
1461 return 0;
1462 }
1463
1464 /* Remote wakeup gadget interface */
udc_wakeup(struct usb_gadget * gadget)1465 static int udc_wakeup(struct usb_gadget *gadget)
1466 {
1467 struct udc *dev;
1468
1469 if (!gadget)
1470 return -EINVAL;
1471 dev = container_of(gadget, struct udc, gadget);
1472 udc_remote_wakeup(dev);
1473
1474 return 0;
1475 }
1476
1477 static int amd5536_udc_start(struct usb_gadget *g,
1478 struct usb_gadget_driver *driver);
1479 static int amd5536_udc_stop(struct usb_gadget *g);
1480
1481 static const struct usb_gadget_ops udc_ops = {
1482 .wakeup = udc_wakeup,
1483 .get_frame = udc_get_frame,
1484 .udc_start = amd5536_udc_start,
1485 .udc_stop = amd5536_udc_stop,
1486 };
1487
1488 /* Setups endpoint parameters, adds endpoints to linked list */
make_ep_lists(struct udc * dev)1489 static void make_ep_lists(struct udc *dev)
1490 {
1491 /* make gadget ep lists */
1492 INIT_LIST_HEAD(&dev->gadget.ep_list);
1493 list_add_tail(&dev->ep[UDC_EPIN_STATUS_IX].ep.ep_list,
1494 &dev->gadget.ep_list);
1495 list_add_tail(&dev->ep[UDC_EPIN_IX].ep.ep_list,
1496 &dev->gadget.ep_list);
1497 list_add_tail(&dev->ep[UDC_EPOUT_IX].ep.ep_list,
1498 &dev->gadget.ep_list);
1499
1500 /* fifo config */
1501 dev->ep[UDC_EPIN_STATUS_IX].fifo_depth = UDC_EPIN_SMALLINT_BUFF_SIZE;
1502 if (dev->gadget.speed == USB_SPEED_FULL)
1503 dev->ep[UDC_EPIN_IX].fifo_depth = UDC_FS_EPIN_BUFF_SIZE;
1504 else if (dev->gadget.speed == USB_SPEED_HIGH)
1505 dev->ep[UDC_EPIN_IX].fifo_depth = hs_tx_buf;
1506 dev->ep[UDC_EPOUT_IX].fifo_depth = UDC_RXFIFO_SIZE;
1507 }
1508
1509 /* Inits UDC context */
udc_basic_init(struct udc * dev)1510 static void udc_basic_init(struct udc *dev)
1511 {
1512 u32 tmp;
1513
1514 DBG(dev, "udc_basic_init()\n");
1515
1516 dev->gadget.speed = USB_SPEED_UNKNOWN;
1517
1518 /* stop RDE timer */
1519 if (timer_pending(&udc_timer)) {
1520 set_rde = 0;
1521 mod_timer(&udc_timer, jiffies - 1);
1522 }
1523 /* stop poll stall timer */
1524 if (timer_pending(&udc_pollstall_timer))
1525 mod_timer(&udc_pollstall_timer, jiffies - 1);
1526 /* disable DMA */
1527 tmp = readl(&dev->regs->ctl);
1528 tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1529 tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_TDE);
1530 writel(tmp, &dev->regs->ctl);
1531
1532 /* enable dynamic CSR programming */
1533 tmp = readl(&dev->regs->cfg);
1534 tmp |= AMD_BIT(UDC_DEVCFG_CSR_PRG);
1535 /* set self powered */
1536 tmp |= AMD_BIT(UDC_DEVCFG_SP);
1537 /* set remote wakeupable */
1538 tmp |= AMD_BIT(UDC_DEVCFG_RWKP);
1539 writel(tmp, &dev->regs->cfg);
1540
1541 make_ep_lists(dev);
1542
1543 dev->data_ep_enabled = 0;
1544 dev->data_ep_queued = 0;
1545 }
1546
1547 /* init registers at driver load time */
startup_registers(struct udc * dev)1548 static int startup_registers(struct udc *dev)
1549 {
1550 u32 tmp;
1551
1552 /* init controller by soft reset */
1553 udc_soft_reset(dev);
1554
1555 /* mask not needed interrupts */
1556 udc_mask_unused_interrupts(dev);
1557
1558 /* put into initial config */
1559 udc_basic_init(dev);
1560 /* link up all endpoints */
1561 udc_setup_endpoints(dev);
1562
1563 /* program speed */
1564 tmp = readl(&dev->regs->cfg);
1565 if (use_fullspeed)
1566 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1567 else
1568 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_HS, UDC_DEVCFG_SPD);
1569 writel(tmp, &dev->regs->cfg);
1570
1571 return 0;
1572 }
1573
1574 /* Sets initial endpoint parameters */
udc_setup_endpoints(struct udc * dev)1575 static void udc_setup_endpoints(struct udc *dev)
1576 {
1577 struct udc_ep *ep;
1578 u32 tmp;
1579 u32 reg;
1580
1581 DBG(dev, "udc_setup_endpoints()\n");
1582
1583 /* read enum speed */
1584 tmp = readl(&dev->regs->sts);
1585 tmp = AMD_GETBITS(tmp, UDC_DEVSTS_ENUM_SPEED);
1586 if (tmp == UDC_DEVSTS_ENUM_SPEED_HIGH)
1587 dev->gadget.speed = USB_SPEED_HIGH;
1588 else if (tmp == UDC_DEVSTS_ENUM_SPEED_FULL)
1589 dev->gadget.speed = USB_SPEED_FULL;
1590
1591 /* set basic ep parameters */
1592 for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1593 ep = &dev->ep[tmp];
1594 ep->dev = dev;
1595 ep->ep.name = ep_info[tmp].name;
1596 ep->ep.caps = ep_info[tmp].caps;
1597 ep->num = tmp;
1598 /* txfifo size is calculated at enable time */
1599 ep->txfifo = dev->txfifo;
1600
1601 /* fifo size */
1602 if (tmp < UDC_EPIN_NUM) {
1603 ep->fifo_depth = UDC_TXFIFO_SIZE;
1604 ep->in = 1;
1605 } else {
1606 ep->fifo_depth = UDC_RXFIFO_SIZE;
1607 ep->in = 0;
1608
1609 }
1610 ep->regs = &dev->ep_regs[tmp];
1611 /*
1612 * ep will be reset only if ep was not enabled before to avoid
1613 * disabling ep interrupts when ENUM interrupt occurs but ep is
1614 * not enabled by gadget driver
1615 */
1616 if (!ep->ep.desc)
1617 ep_init(dev->regs, ep);
1618
1619 if (use_dma) {
1620 /*
1621 * ep->dma is not really used, just to indicate that
1622 * DMA is active: remove this
1623 * dma regs = dev control regs
1624 */
1625 ep->dma = &dev->regs->ctl;
1626
1627 /* nak OUT endpoints until enable - not for ep0 */
1628 if (tmp != UDC_EP0IN_IX && tmp != UDC_EP0OUT_IX
1629 && tmp > UDC_EPIN_NUM) {
1630 /* set NAK */
1631 reg = readl(&dev->ep[tmp].regs->ctl);
1632 reg |= AMD_BIT(UDC_EPCTL_SNAK);
1633 writel(reg, &dev->ep[tmp].regs->ctl);
1634 dev->ep[tmp].naking = 1;
1635
1636 }
1637 }
1638 }
1639 /* EP0 max packet */
1640 if (dev->gadget.speed == USB_SPEED_FULL) {
1641 usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0IN_IX].ep,
1642 UDC_FS_EP0IN_MAX_PKT_SIZE);
1643 usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0OUT_IX].ep,
1644 UDC_FS_EP0OUT_MAX_PKT_SIZE);
1645 } else if (dev->gadget.speed == USB_SPEED_HIGH) {
1646 usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0IN_IX].ep,
1647 UDC_EP0IN_MAX_PKT_SIZE);
1648 usb_ep_set_maxpacket_limit(&dev->ep[UDC_EP0OUT_IX].ep,
1649 UDC_EP0OUT_MAX_PKT_SIZE);
1650 }
1651
1652 /*
1653 * with suspend bug workaround, ep0 params for gadget driver
1654 * are set at gadget driver bind() call
1655 */
1656 dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
1657 dev->ep[UDC_EP0IN_IX].halted = 0;
1658 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
1659
1660 /* init cfg/alt/int */
1661 dev->cur_config = 0;
1662 dev->cur_intf = 0;
1663 dev->cur_alt = 0;
1664 }
1665
1666 /* Bringup after Connect event, initial bringup to be ready for ep0 events */
usb_connect(struct udc * dev)1667 static void usb_connect(struct udc *dev)
1668 {
1669
1670 dev_info(&dev->pdev->dev, "USB Connect\n");
1671
1672 dev->connected = 1;
1673
1674 /* put into initial config */
1675 udc_basic_init(dev);
1676
1677 /* enable device setup interrupts */
1678 udc_enable_dev_setup_interrupts(dev);
1679 }
1680
1681 /*
1682 * Calls gadget with disconnect event and resets the UDC and makes
1683 * initial bringup to be ready for ep0 events
1684 */
usb_disconnect(struct udc * dev)1685 static void usb_disconnect(struct udc *dev)
1686 {
1687
1688 dev_info(&dev->pdev->dev, "USB Disconnect\n");
1689
1690 dev->connected = 0;
1691
1692 /* mask interrupts */
1693 udc_mask_unused_interrupts(dev);
1694
1695 /* REVISIT there doesn't seem to be a point to having this
1696 * talk to a tasklet ... do it directly, we already hold
1697 * the spinlock needed to process the disconnect.
1698 */
1699
1700 tasklet_schedule(&disconnect_tasklet);
1701 }
1702
1703 /* Tasklet for disconnect to be outside of interrupt context */
udc_tasklet_disconnect(unsigned long par)1704 static void udc_tasklet_disconnect(unsigned long par)
1705 {
1706 struct udc *dev = (struct udc *)(*((struct udc **) par));
1707 u32 tmp;
1708
1709 DBG(dev, "Tasklet disconnect\n");
1710 spin_lock_irq(&dev->lock);
1711
1712 if (dev->driver) {
1713 spin_unlock(&dev->lock);
1714 dev->driver->disconnect(&dev->gadget);
1715 spin_lock(&dev->lock);
1716
1717 /* empty queues */
1718 for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
1719 empty_req_queue(&dev->ep[tmp]);
1720
1721 }
1722
1723 /* disable ep0 */
1724 ep_init(dev->regs,
1725 &dev->ep[UDC_EP0IN_IX]);
1726
1727
1728 if (!soft_reset_occured) {
1729 /* init controller by soft reset */
1730 udc_soft_reset(dev);
1731 soft_reset_occured++;
1732 }
1733
1734 /* re-enable dev interrupts */
1735 udc_enable_dev_setup_interrupts(dev);
1736 /* back to full speed ? */
1737 if (use_fullspeed) {
1738 tmp = readl(&dev->regs->cfg);
1739 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1740 writel(tmp, &dev->regs->cfg);
1741 }
1742
1743 spin_unlock_irq(&dev->lock);
1744 }
1745
1746 /* Reset the UDC core */
udc_soft_reset(struct udc * dev)1747 static void udc_soft_reset(struct udc *dev)
1748 {
1749 unsigned long flags;
1750
1751 DBG(dev, "Soft reset\n");
1752 /*
1753 * reset possible waiting interrupts, because int.
1754 * status is lost after soft reset,
1755 * ep int. status reset
1756 */
1757 writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqsts);
1758 /* device int. status reset */
1759 writel(UDC_DEV_MSK_DISABLE, &dev->regs->irqsts);
1760
1761 spin_lock_irqsave(&udc_irq_spinlock, flags);
1762 writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
1763 readl(&dev->regs->cfg);
1764 spin_unlock_irqrestore(&udc_irq_spinlock, flags);
1765
1766 }
1767
1768 /* RDE timer callback to set RDE bit */
udc_timer_function(unsigned long v)1769 static void udc_timer_function(unsigned long v)
1770 {
1771 u32 tmp;
1772
1773 spin_lock_irq(&udc_irq_spinlock);
1774
1775 if (set_rde > 0) {
1776 /*
1777 * open the fifo if fifo was filled on last timer call
1778 * conditionally
1779 */
1780 if (set_rde > 1) {
1781 /* set RDE to receive setup data */
1782 tmp = readl(&udc->regs->ctl);
1783 tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1784 writel(tmp, &udc->regs->ctl);
1785 set_rde = -1;
1786 } else if (readl(&udc->regs->sts)
1787 & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
1788 /*
1789 * if fifo empty setup polling, do not just
1790 * open the fifo
1791 */
1792 udc_timer.expires = jiffies + HZ/UDC_RDE_TIMER_DIV;
1793 if (!stop_timer)
1794 add_timer(&udc_timer);
1795 } else {
1796 /*
1797 * fifo contains data now, setup timer for opening
1798 * the fifo when timer expires to be able to receive
1799 * setup packets, when data packets gets queued by
1800 * gadget layer then timer will forced to expire with
1801 * set_rde=0 (RDE is set in udc_queue())
1802 */
1803 set_rde++;
1804 /* debug: lhadmot_timer_start = 221070 */
1805 udc_timer.expires = jiffies + HZ*UDC_RDE_TIMER_SECONDS;
1806 if (!stop_timer)
1807 add_timer(&udc_timer);
1808 }
1809
1810 } else
1811 set_rde = -1; /* RDE was set by udc_queue() */
1812 spin_unlock_irq(&udc_irq_spinlock);
1813 if (stop_timer)
1814 complete(&on_exit);
1815
1816 }
1817
1818 /* Handle halt state, used in stall poll timer */
udc_handle_halt_state(struct udc_ep * ep)1819 static void udc_handle_halt_state(struct udc_ep *ep)
1820 {
1821 u32 tmp;
1822 /* set stall as long not halted */
1823 if (ep->halted == 1) {
1824 tmp = readl(&ep->regs->ctl);
1825 /* STALL cleared ? */
1826 if (!(tmp & AMD_BIT(UDC_EPCTL_S))) {
1827 /*
1828 * FIXME: MSC spec requires that stall remains
1829 * even on receivng of CLEAR_FEATURE HALT. So
1830 * we would set STALL again here to be compliant.
1831 * But with current mass storage drivers this does
1832 * not work (would produce endless host retries).
1833 * So we clear halt on CLEAR_FEATURE.
1834 *
1835 DBG(ep->dev, "ep %d: set STALL again\n", ep->num);
1836 tmp |= AMD_BIT(UDC_EPCTL_S);
1837 writel(tmp, &ep->regs->ctl);*/
1838
1839 /* clear NAK by writing CNAK */
1840 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1841 writel(tmp, &ep->regs->ctl);
1842 ep->halted = 0;
1843 UDC_QUEUE_CNAK(ep, ep->num);
1844 }
1845 }
1846 }
1847
1848 /* Stall timer callback to poll S bit and set it again after */
udc_pollstall_timer_function(unsigned long v)1849 static void udc_pollstall_timer_function(unsigned long v)
1850 {
1851 struct udc_ep *ep;
1852 int halted = 0;
1853
1854 spin_lock_irq(&udc_stall_spinlock);
1855 /*
1856 * only one IN and OUT endpoints are handled
1857 * IN poll stall
1858 */
1859 ep = &udc->ep[UDC_EPIN_IX];
1860 udc_handle_halt_state(ep);
1861 if (ep->halted)
1862 halted = 1;
1863 /* OUT poll stall */
1864 ep = &udc->ep[UDC_EPOUT_IX];
1865 udc_handle_halt_state(ep);
1866 if (ep->halted)
1867 halted = 1;
1868
1869 /* setup timer again when still halted */
1870 if (!stop_pollstall_timer && halted) {
1871 udc_pollstall_timer.expires = jiffies +
1872 HZ * UDC_POLLSTALL_TIMER_USECONDS
1873 / (1000 * 1000);
1874 add_timer(&udc_pollstall_timer);
1875 }
1876 spin_unlock_irq(&udc_stall_spinlock);
1877
1878 if (stop_pollstall_timer)
1879 complete(&on_pollstall_exit);
1880 }
1881
1882 /* Inits endpoint 0 so that SETUP packets are processed */
activate_control_endpoints(struct udc * dev)1883 static void activate_control_endpoints(struct udc *dev)
1884 {
1885 u32 tmp;
1886
1887 DBG(dev, "activate_control_endpoints\n");
1888
1889 /* flush fifo */
1890 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1891 tmp |= AMD_BIT(UDC_EPCTL_F);
1892 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1893
1894 /* set ep0 directions */
1895 dev->ep[UDC_EP0IN_IX].in = 1;
1896 dev->ep[UDC_EP0OUT_IX].in = 0;
1897
1898 /* set buffer size (tx fifo entries) of EP0_IN */
1899 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1900 if (dev->gadget.speed == USB_SPEED_FULL)
1901 tmp = AMD_ADDBITS(tmp, UDC_FS_EPIN0_BUFF_SIZE,
1902 UDC_EPIN_BUFF_SIZE);
1903 else if (dev->gadget.speed == USB_SPEED_HIGH)
1904 tmp = AMD_ADDBITS(tmp, UDC_EPIN0_BUFF_SIZE,
1905 UDC_EPIN_BUFF_SIZE);
1906 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1907
1908 /* set max packet size of EP0_IN */
1909 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1910 if (dev->gadget.speed == USB_SPEED_FULL)
1911 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0IN_MAX_PKT_SIZE,
1912 UDC_EP_MAX_PKT_SIZE);
1913 else if (dev->gadget.speed == USB_SPEED_HIGH)
1914 tmp = AMD_ADDBITS(tmp, UDC_EP0IN_MAX_PKT_SIZE,
1915 UDC_EP_MAX_PKT_SIZE);
1916 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1917
1918 /* set max packet size of EP0_OUT */
1919 tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1920 if (dev->gadget.speed == USB_SPEED_FULL)
1921 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1922 UDC_EP_MAX_PKT_SIZE);
1923 else if (dev->gadget.speed == USB_SPEED_HIGH)
1924 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1925 UDC_EP_MAX_PKT_SIZE);
1926 writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1927
1928 /* set max packet size of EP0 in UDC CSR */
1929 tmp = readl(&dev->csr->ne[0]);
1930 if (dev->gadget.speed == USB_SPEED_FULL)
1931 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1932 UDC_CSR_NE_MAX_PKT);
1933 else if (dev->gadget.speed == USB_SPEED_HIGH)
1934 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1935 UDC_CSR_NE_MAX_PKT);
1936 writel(tmp, &dev->csr->ne[0]);
1937
1938 if (use_dma) {
1939 dev->ep[UDC_EP0OUT_IX].td->status |=
1940 AMD_BIT(UDC_DMA_OUT_STS_L);
1941 /* write dma desc address */
1942 writel(dev->ep[UDC_EP0OUT_IX].td_stp_dma,
1943 &dev->ep[UDC_EP0OUT_IX].regs->subptr);
1944 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
1945 &dev->ep[UDC_EP0OUT_IX].regs->desptr);
1946 /* stop RDE timer */
1947 if (timer_pending(&udc_timer)) {
1948 set_rde = 0;
1949 mod_timer(&udc_timer, jiffies - 1);
1950 }
1951 /* stop pollstall timer */
1952 if (timer_pending(&udc_pollstall_timer))
1953 mod_timer(&udc_pollstall_timer, jiffies - 1);
1954 /* enable DMA */
1955 tmp = readl(&dev->regs->ctl);
1956 tmp |= AMD_BIT(UDC_DEVCTL_MODE)
1957 | AMD_BIT(UDC_DEVCTL_RDE)
1958 | AMD_BIT(UDC_DEVCTL_TDE);
1959 if (use_dma_bufferfill_mode)
1960 tmp |= AMD_BIT(UDC_DEVCTL_BF);
1961 else if (use_dma_ppb_du)
1962 tmp |= AMD_BIT(UDC_DEVCTL_DU);
1963 writel(tmp, &dev->regs->ctl);
1964 }
1965
1966 /* clear NAK by writing CNAK for EP0IN */
1967 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1968 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1969 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1970 dev->ep[UDC_EP0IN_IX].naking = 0;
1971 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
1972
1973 /* clear NAK by writing CNAK for EP0OUT */
1974 tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
1975 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1976 writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
1977 dev->ep[UDC_EP0OUT_IX].naking = 0;
1978 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
1979 }
1980
1981 /* Make endpoint 0 ready for control traffic */
setup_ep0(struct udc * dev)1982 static int setup_ep0(struct udc *dev)
1983 {
1984 activate_control_endpoints(dev);
1985 /* enable ep0 interrupts */
1986 udc_enable_ep0_interrupts(dev);
1987 /* enable device setup interrupts */
1988 udc_enable_dev_setup_interrupts(dev);
1989
1990 return 0;
1991 }
1992
1993 /* Called by gadget driver to register itself */
amd5536_udc_start(struct usb_gadget * g,struct usb_gadget_driver * driver)1994 static int amd5536_udc_start(struct usb_gadget *g,
1995 struct usb_gadget_driver *driver)
1996 {
1997 struct udc *dev = to_amd5536_udc(g);
1998 u32 tmp;
1999
2000 driver->driver.bus = NULL;
2001 dev->driver = driver;
2002
2003 /* Some gadget drivers use both ep0 directions.
2004 * NOTE: to gadget driver, ep0 is just one endpoint...
2005 */
2006 dev->ep[UDC_EP0OUT_IX].ep.driver_data =
2007 dev->ep[UDC_EP0IN_IX].ep.driver_data;
2008
2009 /* get ready for ep0 traffic */
2010 setup_ep0(dev);
2011
2012 /* clear SD */
2013 tmp = readl(&dev->regs->ctl);
2014 tmp = tmp & AMD_CLEAR_BIT(UDC_DEVCTL_SD);
2015 writel(tmp, &dev->regs->ctl);
2016
2017 usb_connect(dev);
2018
2019 return 0;
2020 }
2021
2022 /* shutdown requests and disconnect from gadget */
2023 static void
shutdown(struct udc * dev,struct usb_gadget_driver * driver)2024 shutdown(struct udc *dev, struct usb_gadget_driver *driver)
2025 __releases(dev->lock)
2026 __acquires(dev->lock)
2027 {
2028 int tmp;
2029
2030 /* empty queues and init hardware */
2031 udc_basic_init(dev);
2032
2033 for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
2034 empty_req_queue(&dev->ep[tmp]);
2035
2036 udc_setup_endpoints(dev);
2037 }
2038
2039 /* Called by gadget driver to unregister itself */
amd5536_udc_stop(struct usb_gadget * g)2040 static int amd5536_udc_stop(struct usb_gadget *g)
2041 {
2042 struct udc *dev = to_amd5536_udc(g);
2043 unsigned long flags;
2044 u32 tmp;
2045
2046 spin_lock_irqsave(&dev->lock, flags);
2047 udc_mask_unused_interrupts(dev);
2048 shutdown(dev, NULL);
2049 spin_unlock_irqrestore(&dev->lock, flags);
2050
2051 dev->driver = NULL;
2052
2053 /* set SD */
2054 tmp = readl(&dev->regs->ctl);
2055 tmp |= AMD_BIT(UDC_DEVCTL_SD);
2056 writel(tmp, &dev->regs->ctl);
2057
2058 return 0;
2059 }
2060
2061 /* Clear pending NAK bits */
udc_process_cnak_queue(struct udc * dev)2062 static void udc_process_cnak_queue(struct udc *dev)
2063 {
2064 u32 tmp;
2065 u32 reg;
2066
2067 /* check epin's */
2068 DBG(dev, "CNAK pending queue processing\n");
2069 for (tmp = 0; tmp < UDC_EPIN_NUM_USED; tmp++) {
2070 if (cnak_pending & (1 << tmp)) {
2071 DBG(dev, "CNAK pending for ep%d\n", tmp);
2072 /* clear NAK by writing CNAK */
2073 reg = readl(&dev->ep[tmp].regs->ctl);
2074 reg |= AMD_BIT(UDC_EPCTL_CNAK);
2075 writel(reg, &dev->ep[tmp].regs->ctl);
2076 dev->ep[tmp].naking = 0;
2077 UDC_QUEUE_CNAK(&dev->ep[tmp], dev->ep[tmp].num);
2078 }
2079 }
2080 /* ... and ep0out */
2081 if (cnak_pending & (1 << UDC_EP0OUT_IX)) {
2082 DBG(dev, "CNAK pending for ep%d\n", UDC_EP0OUT_IX);
2083 /* clear NAK by writing CNAK */
2084 reg = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2085 reg |= AMD_BIT(UDC_EPCTL_CNAK);
2086 writel(reg, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2087 dev->ep[UDC_EP0OUT_IX].naking = 0;
2088 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX],
2089 dev->ep[UDC_EP0OUT_IX].num);
2090 }
2091 }
2092
2093 /* Enabling RX DMA after setup packet */
udc_ep0_set_rde(struct udc * dev)2094 static void udc_ep0_set_rde(struct udc *dev)
2095 {
2096 if (use_dma) {
2097 /*
2098 * only enable RXDMA when no data endpoint enabled
2099 * or data is queued
2100 */
2101 if (!dev->data_ep_enabled || dev->data_ep_queued) {
2102 udc_set_rde(dev);
2103 } else {
2104 /*
2105 * setup timer for enabling RDE (to not enable
2106 * RXFIFO DMA for data endpoints to early)
2107 */
2108 if (set_rde != 0 && !timer_pending(&udc_timer)) {
2109 udc_timer.expires =
2110 jiffies + HZ/UDC_RDE_TIMER_DIV;
2111 set_rde = 1;
2112 if (!stop_timer)
2113 add_timer(&udc_timer);
2114 }
2115 }
2116 }
2117 }
2118
2119
2120 /* Interrupt handler for data OUT traffic */
udc_data_out_isr(struct udc * dev,int ep_ix)2121 static irqreturn_t udc_data_out_isr(struct udc *dev, int ep_ix)
2122 {
2123 irqreturn_t ret_val = IRQ_NONE;
2124 u32 tmp;
2125 struct udc_ep *ep;
2126 struct udc_request *req;
2127 unsigned int count;
2128 struct udc_data_dma *td = NULL;
2129 unsigned dma_done;
2130
2131 VDBG(dev, "ep%d irq\n", ep_ix);
2132 ep = &dev->ep[ep_ix];
2133
2134 tmp = readl(&ep->regs->sts);
2135 if (use_dma) {
2136 /* BNA event ? */
2137 if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2138 DBG(dev, "BNA ep%dout occurred - DESPTR = %x\n",
2139 ep->num, readl(&ep->regs->desptr));
2140 /* clear BNA */
2141 writel(tmp | AMD_BIT(UDC_EPSTS_BNA), &ep->regs->sts);
2142 if (!ep->cancel_transfer)
2143 ep->bna_occurred = 1;
2144 else
2145 ep->cancel_transfer = 0;
2146 ret_val = IRQ_HANDLED;
2147 goto finished;
2148 }
2149 }
2150 /* HE event ? */
2151 if (tmp & AMD_BIT(UDC_EPSTS_HE)) {
2152 dev_err(&dev->pdev->dev, "HE ep%dout occurred\n", ep->num);
2153
2154 /* clear HE */
2155 writel(tmp | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2156 ret_val = IRQ_HANDLED;
2157 goto finished;
2158 }
2159
2160 if (!list_empty(&ep->queue)) {
2161
2162 /* next request */
2163 req = list_entry(ep->queue.next,
2164 struct udc_request, queue);
2165 } else {
2166 req = NULL;
2167 udc_rxfifo_pending = 1;
2168 }
2169 VDBG(dev, "req = %p\n", req);
2170 /* fifo mode */
2171 if (!use_dma) {
2172
2173 /* read fifo */
2174 if (req && udc_rxfifo_read(ep, req)) {
2175 ret_val = IRQ_HANDLED;
2176
2177 /* finish */
2178 complete_req(ep, req, 0);
2179 /* next request */
2180 if (!list_empty(&ep->queue) && !ep->halted) {
2181 req = list_entry(ep->queue.next,
2182 struct udc_request, queue);
2183 } else
2184 req = NULL;
2185 }
2186
2187 /* DMA */
2188 } else if (!ep->cancel_transfer && req) {
2189 ret_val = IRQ_HANDLED;
2190
2191 /* check for DMA done */
2192 if (!use_dma_ppb) {
2193 dma_done = AMD_GETBITS(req->td_data->status,
2194 UDC_DMA_OUT_STS_BS);
2195 /* packet per buffer mode - rx bytes */
2196 } else {
2197 /*
2198 * if BNA occurred then recover desc. from
2199 * BNA dummy desc.
2200 */
2201 if (ep->bna_occurred) {
2202 VDBG(dev, "Recover desc. from BNA dummy\n");
2203 memcpy(req->td_data, ep->bna_dummy_req->td_data,
2204 sizeof(struct udc_data_dma));
2205 ep->bna_occurred = 0;
2206 udc_init_bna_dummy(ep->req);
2207 }
2208 td = udc_get_last_dma_desc(req);
2209 dma_done = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_BS);
2210 }
2211 if (dma_done == UDC_DMA_OUT_STS_BS_DMA_DONE) {
2212 /* buffer fill mode - rx bytes */
2213 if (!use_dma_ppb) {
2214 /* received number bytes */
2215 count = AMD_GETBITS(req->td_data->status,
2216 UDC_DMA_OUT_STS_RXBYTES);
2217 VDBG(dev, "rx bytes=%u\n", count);
2218 /* packet per buffer mode - rx bytes */
2219 } else {
2220 VDBG(dev, "req->td_data=%p\n", req->td_data);
2221 VDBG(dev, "last desc = %p\n", td);
2222 /* received number bytes */
2223 if (use_dma_ppb_du) {
2224 /* every desc. counts bytes */
2225 count = udc_get_ppbdu_rxbytes(req);
2226 } else {
2227 /* last desc. counts bytes */
2228 count = AMD_GETBITS(td->status,
2229 UDC_DMA_OUT_STS_RXBYTES);
2230 if (!count && req->req.length
2231 == UDC_DMA_MAXPACKET) {
2232 /*
2233 * on 64k packets the RXBYTES
2234 * field is zero
2235 */
2236 count = UDC_DMA_MAXPACKET;
2237 }
2238 }
2239 VDBG(dev, "last desc rx bytes=%u\n", count);
2240 }
2241
2242 tmp = req->req.length - req->req.actual;
2243 if (count > tmp) {
2244 if ((tmp % ep->ep.maxpacket) != 0) {
2245 DBG(dev, "%s: rx %db, space=%db\n",
2246 ep->ep.name, count, tmp);
2247 req->req.status = -EOVERFLOW;
2248 }
2249 count = tmp;
2250 }
2251 req->req.actual += count;
2252 req->dma_going = 0;
2253 /* complete request */
2254 complete_req(ep, req, 0);
2255
2256 /* next request */
2257 if (!list_empty(&ep->queue) && !ep->halted) {
2258 req = list_entry(ep->queue.next,
2259 struct udc_request,
2260 queue);
2261 /*
2262 * DMA may be already started by udc_queue()
2263 * called by gadget drivers completion
2264 * routine. This happens when queue
2265 * holds one request only.
2266 */
2267 if (req->dma_going == 0) {
2268 /* next dma */
2269 if (prep_dma(ep, req, GFP_ATOMIC) != 0)
2270 goto finished;
2271 /* write desc pointer */
2272 writel(req->td_phys,
2273 &ep->regs->desptr);
2274 req->dma_going = 1;
2275 /* enable DMA */
2276 udc_set_rde(dev);
2277 }
2278 } else {
2279 /*
2280 * implant BNA dummy descriptor to allow
2281 * RXFIFO opening by RDE
2282 */
2283 if (ep->bna_dummy_req) {
2284 /* write desc pointer */
2285 writel(ep->bna_dummy_req->td_phys,
2286 &ep->regs->desptr);
2287 ep->bna_occurred = 0;
2288 }
2289
2290 /*
2291 * schedule timer for setting RDE if queue
2292 * remains empty to allow ep0 packets pass
2293 * through
2294 */
2295 if (set_rde != 0
2296 && !timer_pending(&udc_timer)) {
2297 udc_timer.expires =
2298 jiffies
2299 + HZ*UDC_RDE_TIMER_SECONDS;
2300 set_rde = 1;
2301 if (!stop_timer)
2302 add_timer(&udc_timer);
2303 }
2304 if (ep->num != UDC_EP0OUT_IX)
2305 dev->data_ep_queued = 0;
2306 }
2307
2308 } else {
2309 /*
2310 * RX DMA must be reenabled for each desc in PPBDU mode
2311 * and must be enabled for PPBNDU mode in case of BNA
2312 */
2313 udc_set_rde(dev);
2314 }
2315
2316 } else if (ep->cancel_transfer) {
2317 ret_val = IRQ_HANDLED;
2318 ep->cancel_transfer = 0;
2319 }
2320
2321 /* check pending CNAKS */
2322 if (cnak_pending) {
2323 /* CNAk processing when rxfifo empty only */
2324 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
2325 udc_process_cnak_queue(dev);
2326 }
2327
2328 /* clear OUT bits in ep status */
2329 writel(UDC_EPSTS_OUT_CLEAR, &ep->regs->sts);
2330 finished:
2331 return ret_val;
2332 }
2333
2334 /* Interrupt handler for data IN traffic */
udc_data_in_isr(struct udc * dev,int ep_ix)2335 static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
2336 {
2337 irqreturn_t ret_val = IRQ_NONE;
2338 u32 tmp;
2339 u32 epsts;
2340 struct udc_ep *ep;
2341 struct udc_request *req;
2342 struct udc_data_dma *td;
2343 unsigned dma_done;
2344 unsigned len;
2345
2346 ep = &dev->ep[ep_ix];
2347
2348 epsts = readl(&ep->regs->sts);
2349 if (use_dma) {
2350 /* BNA ? */
2351 if (epsts & AMD_BIT(UDC_EPSTS_BNA)) {
2352 dev_err(&dev->pdev->dev,
2353 "BNA ep%din occurred - DESPTR = %08lx\n",
2354 ep->num,
2355 (unsigned long) readl(&ep->regs->desptr));
2356
2357 /* clear BNA */
2358 writel(epsts, &ep->regs->sts);
2359 ret_val = IRQ_HANDLED;
2360 goto finished;
2361 }
2362 }
2363 /* HE event ? */
2364 if (epsts & AMD_BIT(UDC_EPSTS_HE)) {
2365 dev_err(&dev->pdev->dev,
2366 "HE ep%dn occurred - DESPTR = %08lx\n",
2367 ep->num, (unsigned long) readl(&ep->regs->desptr));
2368
2369 /* clear HE */
2370 writel(epsts | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2371 ret_val = IRQ_HANDLED;
2372 goto finished;
2373 }
2374
2375 /* DMA completion */
2376 if (epsts & AMD_BIT(UDC_EPSTS_TDC)) {
2377 VDBG(dev, "TDC set- completion\n");
2378 ret_val = IRQ_HANDLED;
2379 if (!ep->cancel_transfer && !list_empty(&ep->queue)) {
2380 req = list_entry(ep->queue.next,
2381 struct udc_request, queue);
2382 /*
2383 * length bytes transferred
2384 * check dma done of last desc. in PPBDU mode
2385 */
2386 if (use_dma_ppb_du) {
2387 td = udc_get_last_dma_desc(req);
2388 if (td) {
2389 dma_done =
2390 AMD_GETBITS(td->status,
2391 UDC_DMA_IN_STS_BS);
2392 /* don't care DMA done */
2393 req->req.actual = req->req.length;
2394 }
2395 } else {
2396 /* assume all bytes transferred */
2397 req->req.actual = req->req.length;
2398 }
2399
2400 if (req->req.actual == req->req.length) {
2401 /* complete req */
2402 complete_req(ep, req, 0);
2403 req->dma_going = 0;
2404 /* further request available ? */
2405 if (list_empty(&ep->queue)) {
2406 /* disable interrupt */
2407 tmp = readl(&dev->regs->ep_irqmsk);
2408 tmp |= AMD_BIT(ep->num);
2409 writel(tmp, &dev->regs->ep_irqmsk);
2410 }
2411 }
2412 }
2413 ep->cancel_transfer = 0;
2414
2415 }
2416 /*
2417 * status reg has IN bit set and TDC not set (if TDC was handled,
2418 * IN must not be handled (UDC defect) ?
2419 */
2420 if ((epsts & AMD_BIT(UDC_EPSTS_IN))
2421 && !(epsts & AMD_BIT(UDC_EPSTS_TDC))) {
2422 ret_val = IRQ_HANDLED;
2423 if (!list_empty(&ep->queue)) {
2424 /* next request */
2425 req = list_entry(ep->queue.next,
2426 struct udc_request, queue);
2427 /* FIFO mode */
2428 if (!use_dma) {
2429 /* write fifo */
2430 udc_txfifo_write(ep, &req->req);
2431 len = req->req.length - req->req.actual;
2432 if (len > ep->ep.maxpacket)
2433 len = ep->ep.maxpacket;
2434 req->req.actual += len;
2435 if (req->req.actual == req->req.length
2436 || (len != ep->ep.maxpacket)) {
2437 /* complete req */
2438 complete_req(ep, req, 0);
2439 }
2440 /* DMA */
2441 } else if (req && !req->dma_going) {
2442 VDBG(dev, "IN DMA : req=%p req->td_data=%p\n",
2443 req, req->td_data);
2444 if (req->td_data) {
2445
2446 req->dma_going = 1;
2447
2448 /*
2449 * unset L bit of first desc.
2450 * for chain
2451 */
2452 if (use_dma_ppb && req->req.length >
2453 ep->ep.maxpacket) {
2454 req->td_data->status &=
2455 AMD_CLEAR_BIT(
2456 UDC_DMA_IN_STS_L);
2457 }
2458
2459 /* write desc pointer */
2460 writel(req->td_phys, &ep->regs->desptr);
2461
2462 /* set HOST READY */
2463 req->td_data->status =
2464 AMD_ADDBITS(
2465 req->td_data->status,
2466 UDC_DMA_IN_STS_BS_HOST_READY,
2467 UDC_DMA_IN_STS_BS);
2468
2469 /* set poll demand bit */
2470 tmp = readl(&ep->regs->ctl);
2471 tmp |= AMD_BIT(UDC_EPCTL_P);
2472 writel(tmp, &ep->regs->ctl);
2473 }
2474 }
2475
2476 } else if (!use_dma && ep->in) {
2477 /* disable interrupt */
2478 tmp = readl(
2479 &dev->regs->ep_irqmsk);
2480 tmp |= AMD_BIT(ep->num);
2481 writel(tmp,
2482 &dev->regs->ep_irqmsk);
2483 }
2484 }
2485 /* clear status bits */
2486 writel(epsts, &ep->regs->sts);
2487
2488 finished:
2489 return ret_val;
2490
2491 }
2492
2493 /* Interrupt handler for Control OUT traffic */
udc_control_out_isr(struct udc * dev)2494 static irqreturn_t udc_control_out_isr(struct udc *dev)
2495 __releases(dev->lock)
2496 __acquires(dev->lock)
2497 {
2498 irqreturn_t ret_val = IRQ_NONE;
2499 u32 tmp;
2500 int setup_supported;
2501 u32 count;
2502 int set = 0;
2503 struct udc_ep *ep;
2504 struct udc_ep *ep_tmp;
2505
2506 ep = &dev->ep[UDC_EP0OUT_IX];
2507
2508 /* clear irq */
2509 writel(AMD_BIT(UDC_EPINT_OUT_EP0), &dev->regs->ep_irqsts);
2510
2511 tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2512 /* check BNA and clear if set */
2513 if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2514 VDBG(dev, "ep0: BNA set\n");
2515 writel(AMD_BIT(UDC_EPSTS_BNA),
2516 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2517 ep->bna_occurred = 1;
2518 ret_val = IRQ_HANDLED;
2519 goto finished;
2520 }
2521
2522 /* type of data: SETUP or DATA 0 bytes */
2523 tmp = AMD_GETBITS(tmp, UDC_EPSTS_OUT);
2524 VDBG(dev, "data_typ = %x\n", tmp);
2525
2526 /* setup data */
2527 if (tmp == UDC_EPSTS_OUT_SETUP) {
2528 ret_val = IRQ_HANDLED;
2529
2530 ep->dev->stall_ep0in = 0;
2531 dev->waiting_zlp_ack_ep0in = 0;
2532
2533 /* set NAK for EP0_IN */
2534 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2535 tmp |= AMD_BIT(UDC_EPCTL_SNAK);
2536 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2537 dev->ep[UDC_EP0IN_IX].naking = 1;
2538 /* get setup data */
2539 if (use_dma) {
2540
2541 /* clear OUT bits in ep status */
2542 writel(UDC_EPSTS_OUT_CLEAR,
2543 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2544
2545 setup_data.data[0] =
2546 dev->ep[UDC_EP0OUT_IX].td_stp->data12;
2547 setup_data.data[1] =
2548 dev->ep[UDC_EP0OUT_IX].td_stp->data34;
2549 /* set HOST READY */
2550 dev->ep[UDC_EP0OUT_IX].td_stp->status =
2551 UDC_DMA_STP_STS_BS_HOST_READY;
2552 } else {
2553 /* read fifo */
2554 udc_rxfifo_read_dwords(dev, setup_data.data, 2);
2555 }
2556
2557 /* determine direction of control data */
2558 if ((setup_data.request.bRequestType & USB_DIR_IN) != 0) {
2559 dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
2560 /* enable RDE */
2561 udc_ep0_set_rde(dev);
2562 set = 0;
2563 } else {
2564 dev->gadget.ep0 = &dev->ep[UDC_EP0OUT_IX].ep;
2565 /*
2566 * implant BNA dummy descriptor to allow RXFIFO opening
2567 * by RDE
2568 */
2569 if (ep->bna_dummy_req) {
2570 /* write desc pointer */
2571 writel(ep->bna_dummy_req->td_phys,
2572 &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2573 ep->bna_occurred = 0;
2574 }
2575
2576 set = 1;
2577 dev->ep[UDC_EP0OUT_IX].naking = 1;
2578 /*
2579 * setup timer for enabling RDE (to not enable
2580 * RXFIFO DMA for data to early)
2581 */
2582 set_rde = 1;
2583 if (!timer_pending(&udc_timer)) {
2584 udc_timer.expires = jiffies +
2585 HZ/UDC_RDE_TIMER_DIV;
2586 if (!stop_timer)
2587 add_timer(&udc_timer);
2588 }
2589 }
2590
2591 /*
2592 * mass storage reset must be processed here because
2593 * next packet may be a CLEAR_FEATURE HALT which would not
2594 * clear the stall bit when no STALL handshake was received
2595 * before (autostall can cause this)
2596 */
2597 if (setup_data.data[0] == UDC_MSCRES_DWORD0
2598 && setup_data.data[1] == UDC_MSCRES_DWORD1) {
2599 DBG(dev, "MSC Reset\n");
2600 /*
2601 * clear stall bits
2602 * only one IN and OUT endpoints are handled
2603 */
2604 ep_tmp = &udc->ep[UDC_EPIN_IX];
2605 udc_set_halt(&ep_tmp->ep, 0);
2606 ep_tmp = &udc->ep[UDC_EPOUT_IX];
2607 udc_set_halt(&ep_tmp->ep, 0);
2608 }
2609
2610 /* call gadget with setup data received */
2611 spin_unlock(&dev->lock);
2612 setup_supported = dev->driver->setup(&dev->gadget,
2613 &setup_data.request);
2614 spin_lock(&dev->lock);
2615
2616 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2617 /* ep0 in returns data (not zlp) on IN phase */
2618 if (setup_supported >= 0 && setup_supported <
2619 UDC_EP0IN_MAXPACKET) {
2620 /* clear NAK by writing CNAK in EP0_IN */
2621 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2622 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2623 dev->ep[UDC_EP0IN_IX].naking = 0;
2624 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
2625
2626 /* if unsupported request then stall */
2627 } else if (setup_supported < 0) {
2628 tmp |= AMD_BIT(UDC_EPCTL_S);
2629 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2630 } else
2631 dev->waiting_zlp_ack_ep0in = 1;
2632
2633
2634 /* clear NAK by writing CNAK in EP0_OUT */
2635 if (!set) {
2636 tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2637 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2638 writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2639 dev->ep[UDC_EP0OUT_IX].naking = 0;
2640 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
2641 }
2642
2643 if (!use_dma) {
2644 /* clear OUT bits in ep status */
2645 writel(UDC_EPSTS_OUT_CLEAR,
2646 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2647 }
2648
2649 /* data packet 0 bytes */
2650 } else if (tmp == UDC_EPSTS_OUT_DATA) {
2651 /* clear OUT bits in ep status */
2652 writel(UDC_EPSTS_OUT_CLEAR, &dev->ep[UDC_EP0OUT_IX].regs->sts);
2653
2654 /* get setup data: only 0 packet */
2655 if (use_dma) {
2656 /* no req if 0 packet, just reactivate */
2657 if (list_empty(&dev->ep[UDC_EP0OUT_IX].queue)) {
2658 VDBG(dev, "ZLP\n");
2659
2660 /* set HOST READY */
2661 dev->ep[UDC_EP0OUT_IX].td->status =
2662 AMD_ADDBITS(
2663 dev->ep[UDC_EP0OUT_IX].td->status,
2664 UDC_DMA_OUT_STS_BS_HOST_READY,
2665 UDC_DMA_OUT_STS_BS);
2666 /* enable RDE */
2667 udc_ep0_set_rde(dev);
2668 ret_val = IRQ_HANDLED;
2669
2670 } else {
2671 /* control write */
2672 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2673 /* re-program desc. pointer for possible ZLPs */
2674 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
2675 &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2676 /* enable RDE */
2677 udc_ep0_set_rde(dev);
2678 }
2679 } else {
2680
2681 /* received number bytes */
2682 count = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2683 count = AMD_GETBITS(count, UDC_EPSTS_RX_PKT_SIZE);
2684 /* out data for fifo mode not working */
2685 count = 0;
2686
2687 /* 0 packet or real data ? */
2688 if (count != 0) {
2689 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2690 } else {
2691 /* dummy read confirm */
2692 readl(&dev->ep[UDC_EP0OUT_IX].regs->confirm);
2693 ret_val = IRQ_HANDLED;
2694 }
2695 }
2696 }
2697
2698 /* check pending CNAKS */
2699 if (cnak_pending) {
2700 /* CNAk processing when rxfifo empty only */
2701 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
2702 udc_process_cnak_queue(dev);
2703 }
2704
2705 finished:
2706 return ret_val;
2707 }
2708
2709 /* Interrupt handler for Control IN traffic */
udc_control_in_isr(struct udc * dev)2710 static irqreturn_t udc_control_in_isr(struct udc *dev)
2711 {
2712 irqreturn_t ret_val = IRQ_NONE;
2713 u32 tmp;
2714 struct udc_ep *ep;
2715 struct udc_request *req;
2716 unsigned len;
2717
2718 ep = &dev->ep[UDC_EP0IN_IX];
2719
2720 /* clear irq */
2721 writel(AMD_BIT(UDC_EPINT_IN_EP0), &dev->regs->ep_irqsts);
2722
2723 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->sts);
2724 /* DMA completion */
2725 if (tmp & AMD_BIT(UDC_EPSTS_TDC)) {
2726 VDBG(dev, "isr: TDC clear\n");
2727 ret_val = IRQ_HANDLED;
2728
2729 /* clear TDC bit */
2730 writel(AMD_BIT(UDC_EPSTS_TDC),
2731 &dev->ep[UDC_EP0IN_IX].regs->sts);
2732
2733 /* status reg has IN bit set ? */
2734 } else if (tmp & AMD_BIT(UDC_EPSTS_IN)) {
2735 ret_val = IRQ_HANDLED;
2736
2737 if (ep->dma) {
2738 /* clear IN bit */
2739 writel(AMD_BIT(UDC_EPSTS_IN),
2740 &dev->ep[UDC_EP0IN_IX].regs->sts);
2741 }
2742 if (dev->stall_ep0in) {
2743 DBG(dev, "stall ep0in\n");
2744 /* halt ep0in */
2745 tmp = readl(&ep->regs->ctl);
2746 tmp |= AMD_BIT(UDC_EPCTL_S);
2747 writel(tmp, &ep->regs->ctl);
2748 } else {
2749 if (!list_empty(&ep->queue)) {
2750 /* next request */
2751 req = list_entry(ep->queue.next,
2752 struct udc_request, queue);
2753
2754 if (ep->dma) {
2755 /* write desc pointer */
2756 writel(req->td_phys, &ep->regs->desptr);
2757 /* set HOST READY */
2758 req->td_data->status =
2759 AMD_ADDBITS(
2760 req->td_data->status,
2761 UDC_DMA_STP_STS_BS_HOST_READY,
2762 UDC_DMA_STP_STS_BS);
2763
2764 /* set poll demand bit */
2765 tmp =
2766 readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2767 tmp |= AMD_BIT(UDC_EPCTL_P);
2768 writel(tmp,
2769 &dev->ep[UDC_EP0IN_IX].regs->ctl);
2770
2771 /* all bytes will be transferred */
2772 req->req.actual = req->req.length;
2773
2774 /* complete req */
2775 complete_req(ep, req, 0);
2776
2777 } else {
2778 /* write fifo */
2779 udc_txfifo_write(ep, &req->req);
2780
2781 /* lengh bytes transferred */
2782 len = req->req.length - req->req.actual;
2783 if (len > ep->ep.maxpacket)
2784 len = ep->ep.maxpacket;
2785
2786 req->req.actual += len;
2787 if (req->req.actual == req->req.length
2788 || (len != ep->ep.maxpacket)) {
2789 /* complete req */
2790 complete_req(ep, req, 0);
2791 }
2792 }
2793
2794 }
2795 }
2796 ep->halted = 0;
2797 dev->stall_ep0in = 0;
2798 if (!ep->dma) {
2799 /* clear IN bit */
2800 writel(AMD_BIT(UDC_EPSTS_IN),
2801 &dev->ep[UDC_EP0IN_IX].regs->sts);
2802 }
2803 }
2804
2805 return ret_val;
2806 }
2807
2808
2809 /* Interrupt handler for global device events */
udc_dev_isr(struct udc * dev,u32 dev_irq)2810 static irqreturn_t udc_dev_isr(struct udc *dev, u32 dev_irq)
2811 __releases(dev->lock)
2812 __acquires(dev->lock)
2813 {
2814 irqreturn_t ret_val = IRQ_NONE;
2815 u32 tmp;
2816 u32 cfg;
2817 struct udc_ep *ep;
2818 u16 i;
2819 u8 udc_csr_epix;
2820
2821 /* SET_CONFIG irq ? */
2822 if (dev_irq & AMD_BIT(UDC_DEVINT_SC)) {
2823 ret_val = IRQ_HANDLED;
2824
2825 /* read config value */
2826 tmp = readl(&dev->regs->sts);
2827 cfg = AMD_GETBITS(tmp, UDC_DEVSTS_CFG);
2828 DBG(dev, "SET_CONFIG interrupt: config=%d\n", cfg);
2829 dev->cur_config = cfg;
2830 dev->set_cfg_not_acked = 1;
2831
2832 /* make usb request for gadget driver */
2833 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2834 setup_data.request.bRequest = USB_REQ_SET_CONFIGURATION;
2835 setup_data.request.wValue = cpu_to_le16(dev->cur_config);
2836
2837 /* programm the NE registers */
2838 for (i = 0; i < UDC_EP_NUM; i++) {
2839 ep = &dev->ep[i];
2840 if (ep->in) {
2841
2842 /* ep ix in UDC CSR register space */
2843 udc_csr_epix = ep->num;
2844
2845
2846 /* OUT ep */
2847 } else {
2848 /* ep ix in UDC CSR register space */
2849 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2850 }
2851
2852 tmp = readl(&dev->csr->ne[udc_csr_epix]);
2853 /* ep cfg */
2854 tmp = AMD_ADDBITS(tmp, ep->dev->cur_config,
2855 UDC_CSR_NE_CFG);
2856 /* write reg */
2857 writel(tmp, &dev->csr->ne[udc_csr_epix]);
2858
2859 /* clear stall bits */
2860 ep->halted = 0;
2861 tmp = readl(&ep->regs->ctl);
2862 tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2863 writel(tmp, &ep->regs->ctl);
2864 }
2865 /* call gadget zero with setup data received */
2866 spin_unlock(&dev->lock);
2867 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2868 spin_lock(&dev->lock);
2869
2870 } /* SET_INTERFACE ? */
2871 if (dev_irq & AMD_BIT(UDC_DEVINT_SI)) {
2872 ret_val = IRQ_HANDLED;
2873
2874 dev->set_cfg_not_acked = 1;
2875 /* read interface and alt setting values */
2876 tmp = readl(&dev->regs->sts);
2877 dev->cur_alt = AMD_GETBITS(tmp, UDC_DEVSTS_ALT);
2878 dev->cur_intf = AMD_GETBITS(tmp, UDC_DEVSTS_INTF);
2879
2880 /* make usb request for gadget driver */
2881 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2882 setup_data.request.bRequest = USB_REQ_SET_INTERFACE;
2883 setup_data.request.bRequestType = USB_RECIP_INTERFACE;
2884 setup_data.request.wValue = cpu_to_le16(dev->cur_alt);
2885 setup_data.request.wIndex = cpu_to_le16(dev->cur_intf);
2886
2887 DBG(dev, "SET_INTERFACE interrupt: alt=%d intf=%d\n",
2888 dev->cur_alt, dev->cur_intf);
2889
2890 /* programm the NE registers */
2891 for (i = 0; i < UDC_EP_NUM; i++) {
2892 ep = &dev->ep[i];
2893 if (ep->in) {
2894
2895 /* ep ix in UDC CSR register space */
2896 udc_csr_epix = ep->num;
2897
2898
2899 /* OUT ep */
2900 } else {
2901 /* ep ix in UDC CSR register space */
2902 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2903 }
2904
2905 /* UDC CSR reg */
2906 /* set ep values */
2907 tmp = readl(&dev->csr->ne[udc_csr_epix]);
2908 /* ep interface */
2909 tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf,
2910 UDC_CSR_NE_INTF);
2911 /* tmp = AMD_ADDBITS(tmp, 2, UDC_CSR_NE_INTF); */
2912 /* ep alt */
2913 tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt,
2914 UDC_CSR_NE_ALT);
2915 /* write reg */
2916 writel(tmp, &dev->csr->ne[udc_csr_epix]);
2917
2918 /* clear stall bits */
2919 ep->halted = 0;
2920 tmp = readl(&ep->regs->ctl);
2921 tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2922 writel(tmp, &ep->regs->ctl);
2923 }
2924
2925 /* call gadget zero with setup data received */
2926 spin_unlock(&dev->lock);
2927 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2928 spin_lock(&dev->lock);
2929
2930 } /* USB reset */
2931 if (dev_irq & AMD_BIT(UDC_DEVINT_UR)) {
2932 DBG(dev, "USB Reset interrupt\n");
2933 ret_val = IRQ_HANDLED;
2934
2935 /* allow soft reset when suspend occurs */
2936 soft_reset_occured = 0;
2937
2938 dev->waiting_zlp_ack_ep0in = 0;
2939 dev->set_cfg_not_acked = 0;
2940
2941 /* mask not needed interrupts */
2942 udc_mask_unused_interrupts(dev);
2943
2944 /* call gadget to resume and reset configs etc. */
2945 spin_unlock(&dev->lock);
2946 if (dev->sys_suspended && dev->driver->resume) {
2947 dev->driver->resume(&dev->gadget);
2948 dev->sys_suspended = 0;
2949 }
2950 usb_gadget_udc_reset(&dev->gadget, dev->driver);
2951 spin_lock(&dev->lock);
2952
2953 /* disable ep0 to empty req queue */
2954 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
2955 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
2956
2957 /* soft reset when rxfifo not empty */
2958 tmp = readl(&dev->regs->sts);
2959 if (!(tmp & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
2960 && !soft_reset_after_usbreset_occured) {
2961 udc_soft_reset(dev);
2962 soft_reset_after_usbreset_occured++;
2963 }
2964
2965 /*
2966 * DMA reset to kill potential old DMA hw hang,
2967 * POLL bit is already reset by ep_init() through
2968 * disconnect()
2969 */
2970 DBG(dev, "DMA machine reset\n");
2971 tmp = readl(&dev->regs->cfg);
2972 writel(tmp | AMD_BIT(UDC_DEVCFG_DMARST), &dev->regs->cfg);
2973 writel(tmp, &dev->regs->cfg);
2974
2975 /* put into initial config */
2976 udc_basic_init(dev);
2977
2978 /* enable device setup interrupts */
2979 udc_enable_dev_setup_interrupts(dev);
2980
2981 /* enable suspend interrupt */
2982 tmp = readl(&dev->regs->irqmsk);
2983 tmp &= AMD_UNMASK_BIT(UDC_DEVINT_US);
2984 writel(tmp, &dev->regs->irqmsk);
2985
2986 } /* USB suspend */
2987 if (dev_irq & AMD_BIT(UDC_DEVINT_US)) {
2988 DBG(dev, "USB Suspend interrupt\n");
2989 ret_val = IRQ_HANDLED;
2990 if (dev->driver->suspend) {
2991 spin_unlock(&dev->lock);
2992 dev->sys_suspended = 1;
2993 dev->driver->suspend(&dev->gadget);
2994 spin_lock(&dev->lock);
2995 }
2996 } /* new speed ? */
2997 if (dev_irq & AMD_BIT(UDC_DEVINT_ENUM)) {
2998 DBG(dev, "ENUM interrupt\n");
2999 ret_val = IRQ_HANDLED;
3000 soft_reset_after_usbreset_occured = 0;
3001
3002 /* disable ep0 to empty req queue */
3003 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
3004 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
3005
3006 /* link up all endpoints */
3007 udc_setup_endpoints(dev);
3008 dev_info(&dev->pdev->dev, "Connect: %s\n",
3009 usb_speed_string(dev->gadget.speed));
3010
3011 /* init ep 0 */
3012 activate_control_endpoints(dev);
3013
3014 /* enable ep0 interrupts */
3015 udc_enable_ep0_interrupts(dev);
3016 }
3017 /* session valid change interrupt */
3018 if (dev_irq & AMD_BIT(UDC_DEVINT_SVC)) {
3019 DBG(dev, "USB SVC interrupt\n");
3020 ret_val = IRQ_HANDLED;
3021
3022 /* check that session is not valid to detect disconnect */
3023 tmp = readl(&dev->regs->sts);
3024 if (!(tmp & AMD_BIT(UDC_DEVSTS_SESSVLD))) {
3025 /* disable suspend interrupt */
3026 tmp = readl(&dev->regs->irqmsk);
3027 tmp |= AMD_BIT(UDC_DEVINT_US);
3028 writel(tmp, &dev->regs->irqmsk);
3029 DBG(dev, "USB Disconnect (session valid low)\n");
3030 /* cleanup on disconnect */
3031 usb_disconnect(udc);
3032 }
3033
3034 }
3035
3036 return ret_val;
3037 }
3038
3039 /* Interrupt Service Routine, see Linux Kernel Doc for parameters */
udc_irq(int irq,void * pdev)3040 static irqreturn_t udc_irq(int irq, void *pdev)
3041 {
3042 struct udc *dev = pdev;
3043 u32 reg;
3044 u16 i;
3045 u32 ep_irq;
3046 irqreturn_t ret_val = IRQ_NONE;
3047
3048 spin_lock(&dev->lock);
3049
3050 /* check for ep irq */
3051 reg = readl(&dev->regs->ep_irqsts);
3052 if (reg) {
3053 if (reg & AMD_BIT(UDC_EPINT_OUT_EP0))
3054 ret_val |= udc_control_out_isr(dev);
3055 if (reg & AMD_BIT(UDC_EPINT_IN_EP0))
3056 ret_val |= udc_control_in_isr(dev);
3057
3058 /*
3059 * data endpoint
3060 * iterate ep's
3061 */
3062 for (i = 1; i < UDC_EP_NUM; i++) {
3063 ep_irq = 1 << i;
3064 if (!(reg & ep_irq) || i == UDC_EPINT_OUT_EP0)
3065 continue;
3066
3067 /* clear irq status */
3068 writel(ep_irq, &dev->regs->ep_irqsts);
3069
3070 /* irq for out ep ? */
3071 if (i > UDC_EPIN_NUM)
3072 ret_val |= udc_data_out_isr(dev, i);
3073 else
3074 ret_val |= udc_data_in_isr(dev, i);
3075 }
3076
3077 }
3078
3079
3080 /* check for dev irq */
3081 reg = readl(&dev->regs->irqsts);
3082 if (reg) {
3083 /* clear irq */
3084 writel(reg, &dev->regs->irqsts);
3085 ret_val |= udc_dev_isr(dev, reg);
3086 }
3087
3088
3089 spin_unlock(&dev->lock);
3090 return ret_val;
3091 }
3092
3093 /* Tears down device */
gadget_release(struct device * pdev)3094 static void gadget_release(struct device *pdev)
3095 {
3096 struct amd5536udc *dev = dev_get_drvdata(pdev);
3097 kfree(dev);
3098 }
3099
3100 /* Cleanup on device remove */
udc_remove(struct udc * dev)3101 static void udc_remove(struct udc *dev)
3102 {
3103 /* remove timer */
3104 stop_timer++;
3105 if (timer_pending(&udc_timer))
3106 wait_for_completion(&on_exit);
3107 if (udc_timer.data)
3108 del_timer_sync(&udc_timer);
3109 /* remove pollstall timer */
3110 stop_pollstall_timer++;
3111 if (timer_pending(&udc_pollstall_timer))
3112 wait_for_completion(&on_pollstall_exit);
3113 if (udc_pollstall_timer.data)
3114 del_timer_sync(&udc_pollstall_timer);
3115 udc = NULL;
3116 }
3117
3118 /* free all the dma pools */
free_dma_pools(struct udc * dev)3119 static void free_dma_pools(struct udc *dev)
3120 {
3121 dma_pool_free(dev->stp_requests, dev->ep[UDC_EP0OUT_IX].td,
3122 dev->ep[UDC_EP0OUT_IX].td_phys);
3123 dma_pool_free(dev->stp_requests, dev->ep[UDC_EP0OUT_IX].td_stp,
3124 dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3125 dma_pool_destroy(dev->stp_requests);
3126 dma_pool_destroy(dev->data_requests);
3127 }
3128
3129 /* Reset all pci context */
udc_pci_remove(struct pci_dev * pdev)3130 static void udc_pci_remove(struct pci_dev *pdev)
3131 {
3132 struct udc *dev;
3133
3134 dev = pci_get_drvdata(pdev);
3135
3136 usb_del_gadget_udc(&udc->gadget);
3137 /* gadget driver must not be registered */
3138 if (WARN_ON(dev->driver))
3139 return;
3140
3141 /* dma pool cleanup */
3142 free_dma_pools(dev);
3143
3144 /* reset controller */
3145 writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
3146 free_irq(pdev->irq, dev);
3147 iounmap(dev->virt_addr);
3148 release_mem_region(pci_resource_start(pdev, 0),
3149 pci_resource_len(pdev, 0));
3150 pci_disable_device(pdev);
3151
3152 udc_remove(dev);
3153 }
3154
3155 /* create dma pools on init */
init_dma_pools(struct udc * dev)3156 static int init_dma_pools(struct udc *dev)
3157 {
3158 struct udc_stp_dma *td_stp;
3159 struct udc_data_dma *td_data;
3160 int retval;
3161
3162 /* consistent DMA mode setting ? */
3163 if (use_dma_ppb) {
3164 use_dma_bufferfill_mode = 0;
3165 } else {
3166 use_dma_ppb_du = 0;
3167 use_dma_bufferfill_mode = 1;
3168 }
3169
3170 /* DMA setup */
3171 dev->data_requests = dma_pool_create("data_requests", NULL,
3172 sizeof(struct udc_data_dma), 0, 0);
3173 if (!dev->data_requests) {
3174 DBG(dev, "can't get request data pool\n");
3175 return -ENOMEM;
3176 }
3177
3178 /* EP0 in dma regs = dev control regs */
3179 dev->ep[UDC_EP0IN_IX].dma = &dev->regs->ctl;
3180
3181 /* dma desc for setup data */
3182 dev->stp_requests = dma_pool_create("setup requests", NULL,
3183 sizeof(struct udc_stp_dma), 0, 0);
3184 if (!dev->stp_requests) {
3185 DBG(dev, "can't get stp request pool\n");
3186 retval = -ENOMEM;
3187 goto err_create_dma_pool;
3188 }
3189 /* setup */
3190 td_stp = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3191 &dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3192 if (!td_stp) {
3193 retval = -ENOMEM;
3194 goto err_alloc_dma;
3195 }
3196 dev->ep[UDC_EP0OUT_IX].td_stp = td_stp;
3197
3198 /* data: 0 packets !? */
3199 td_data = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3200 &dev->ep[UDC_EP0OUT_IX].td_phys);
3201 if (!td_data) {
3202 retval = -ENOMEM;
3203 goto err_alloc_phys;
3204 }
3205 dev->ep[UDC_EP0OUT_IX].td = td_data;
3206 return 0;
3207
3208 err_alloc_phys:
3209 dma_pool_free(dev->stp_requests, dev->ep[UDC_EP0OUT_IX].td_stp,
3210 dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3211 err_alloc_dma:
3212 dma_pool_destroy(dev->stp_requests);
3213 dev->stp_requests = NULL;
3214 err_create_dma_pool:
3215 dma_pool_destroy(dev->data_requests);
3216 dev->data_requests = NULL;
3217 return retval;
3218 }
3219
3220 /* general probe */
udc_probe(struct udc * dev)3221 static int udc_probe(struct udc *dev)
3222 {
3223 char tmp[128];
3224 u32 reg;
3225 int retval;
3226
3227 /* mark timer as not initialized */
3228 udc_timer.data = 0;
3229 udc_pollstall_timer.data = 0;
3230
3231 /* device struct setup */
3232 dev->gadget.ops = &udc_ops;
3233
3234 dev_set_name(&dev->gadget.dev, "gadget");
3235 dev->gadget.name = name;
3236 dev->gadget.max_speed = USB_SPEED_HIGH;
3237
3238 /* init registers, interrupts, ... */
3239 startup_registers(dev);
3240
3241 dev_info(&dev->pdev->dev, "%s\n", mod_desc);
3242
3243 snprintf(tmp, sizeof(tmp), "%d", dev->irq);
3244 dev_info(&dev->pdev->dev,
3245 "irq %s, pci mem %08lx, chip rev %02x(Geode5536 %s)\n",
3246 tmp, dev->phys_addr, dev->chiprev,
3247 (dev->chiprev == UDC_HSA0_REV) ? "A0" : "B1");
3248 strcpy(tmp, UDC_DRIVER_VERSION_STRING);
3249 if (dev->chiprev == UDC_HSA0_REV) {
3250 dev_err(&dev->pdev->dev, "chip revision is A0; too old\n");
3251 retval = -ENODEV;
3252 goto finished;
3253 }
3254 dev_info(&dev->pdev->dev,
3255 "driver version: %s(for Geode5536 B1)\n", tmp);
3256 udc = dev;
3257
3258 retval = usb_add_gadget_udc_release(&udc->pdev->dev, &dev->gadget,
3259 gadget_release);
3260 if (retval)
3261 goto finished;
3262
3263 /* timer init */
3264 init_timer(&udc_timer);
3265 udc_timer.function = udc_timer_function;
3266 udc_timer.data = 1;
3267 /* timer pollstall init */
3268 init_timer(&udc_pollstall_timer);
3269 udc_pollstall_timer.function = udc_pollstall_timer_function;
3270 udc_pollstall_timer.data = 1;
3271
3272 /* set SD */
3273 reg = readl(&dev->regs->ctl);
3274 reg |= AMD_BIT(UDC_DEVCTL_SD);
3275 writel(reg, &dev->regs->ctl);
3276
3277 /* print dev register info */
3278 print_regs(dev);
3279
3280 return 0;
3281
3282 finished:
3283 return retval;
3284 }
3285
3286 /* Called by pci bus driver to init pci context */
udc_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)3287 static int udc_pci_probe(
3288 struct pci_dev *pdev,
3289 const struct pci_device_id *id
3290 )
3291 {
3292 struct udc *dev;
3293 unsigned long resource;
3294 unsigned long len;
3295 int retval = 0;
3296
3297 /* one udc only */
3298 if (udc) {
3299 dev_dbg(&pdev->dev, "already probed\n");
3300 return -EBUSY;
3301 }
3302
3303 /* init */
3304 dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
3305 if (!dev)
3306 return -ENOMEM;
3307
3308 /* pci setup */
3309 if (pci_enable_device(pdev) < 0) {
3310 retval = -ENODEV;
3311 goto err_pcidev;
3312 }
3313
3314 /* PCI resource allocation */
3315 resource = pci_resource_start(pdev, 0);
3316 len = pci_resource_len(pdev, 0);
3317
3318 if (!request_mem_region(resource, len, name)) {
3319 dev_dbg(&pdev->dev, "pci device used already\n");
3320 retval = -EBUSY;
3321 goto err_memreg;
3322 }
3323
3324 dev->virt_addr = ioremap_nocache(resource, len);
3325 if (!dev->virt_addr) {
3326 dev_dbg(&pdev->dev, "start address cannot be mapped\n");
3327 retval = -EFAULT;
3328 goto err_ioremap;
3329 }
3330
3331 if (!pdev->irq) {
3332 dev_err(&pdev->dev, "irq not set\n");
3333 retval = -ENODEV;
3334 goto err_irq;
3335 }
3336
3337 spin_lock_init(&dev->lock);
3338 /* udc csr registers base */
3339 dev->csr = dev->virt_addr + UDC_CSR_ADDR;
3340 /* dev registers base */
3341 dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
3342 /* ep registers base */
3343 dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
3344 /* fifo's base */
3345 dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
3346 dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
3347
3348 if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
3349 dev_dbg(&pdev->dev, "request_irq(%d) fail\n", pdev->irq);
3350 retval = -EBUSY;
3351 goto err_irq;
3352 }
3353
3354 pci_set_drvdata(pdev, dev);
3355
3356 /* chip revision for Hs AMD5536 */
3357 dev->chiprev = pdev->revision;
3358
3359 pci_set_master(pdev);
3360 pci_try_set_mwi(pdev);
3361
3362 /* init dma pools */
3363 if (use_dma) {
3364 retval = init_dma_pools(dev);
3365 if (retval != 0)
3366 goto err_dma;
3367 }
3368
3369 dev->phys_addr = resource;
3370 dev->irq = pdev->irq;
3371 dev->pdev = pdev;
3372
3373 /* general probing */
3374 if (udc_probe(dev)) {
3375 retval = -ENODEV;
3376 goto err_probe;
3377 }
3378 return 0;
3379
3380 err_probe:
3381 if (use_dma)
3382 free_dma_pools(dev);
3383 err_dma:
3384 free_irq(pdev->irq, dev);
3385 err_irq:
3386 iounmap(dev->virt_addr);
3387 err_ioremap:
3388 release_mem_region(resource, len);
3389 err_memreg:
3390 pci_disable_device(pdev);
3391 err_pcidev:
3392 kfree(dev);
3393 return retval;
3394 }
3395
3396 /* PCI device parameters */
3397 static const struct pci_device_id pci_id[] = {
3398 {
3399 PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
3400 .class = (PCI_CLASS_SERIAL_USB << 8) | 0xfe,
3401 .class_mask = 0xffffffff,
3402 },
3403 {},
3404 };
3405 MODULE_DEVICE_TABLE(pci, pci_id);
3406
3407 /* PCI functions */
3408 static struct pci_driver udc_pci_driver = {
3409 .name = (char *) name,
3410 .id_table = pci_id,
3411 .probe = udc_pci_probe,
3412 .remove = udc_pci_remove,
3413 };
3414
3415 module_pci_driver(udc_pci_driver);
3416
3417 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
3418 MODULE_AUTHOR("Thomas Dahlmann");
3419 MODULE_LICENSE("GPL");
3420
3421