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1 | /* linux/drivers/usb/gadget/s3c-hsudc.c | |
2 | * | |
3 | * Copyright (c) 2010 Samsung Electronics Co., Ltd. | |
4 | * http://www.samsung.com/ | |
5 | * | |
6 | * S3C24XX USB 2.0 High-speed USB controller gadget driver | |
7 | * | |
8 | * The S3C24XX USB 2.0 high-speed USB controller supports upto 9 endpoints. | |
9 | * Each endpoint can be configured as either in or out endpoint. Endpoints | |
10 | * can be configured for Bulk or Interrupt transfer mode. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/dma-mapping.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/clk.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/usb/ch9.h> | |
29 | #include <linux/usb/gadget.h> | |
30 | #include <linux/usb/otg.h> | |
31 | #include <linux/prefetch.h> | |
32 | #include <linux/platform_data/s3c-hsudc.h> | |
33 | #include <linux/regulator/consumer.h> | |
34 | #include <linux/pm_runtime.h> | |
35 | ||
36 | #include <mach/regs-s3c2443-clock.h> | |
37 | ||
38 | #define S3C_HSUDC_REG(x) (x) | |
39 | ||
40 | /* Non-Indexed Registers */ | |
41 | #define S3C_IR S3C_HSUDC_REG(0x00) /* Index Register */ | |
42 | #define S3C_EIR S3C_HSUDC_REG(0x04) /* EP Intr Status */ | |
43 | #define S3C_EIR_EP0 (1<<0) | |
44 | #define S3C_EIER S3C_HSUDC_REG(0x08) /* EP Intr Enable */ | |
45 | #define S3C_FAR S3C_HSUDC_REG(0x0c) /* Gadget Address */ | |
46 | #define S3C_FNR S3C_HSUDC_REG(0x10) /* Frame Number */ | |
47 | #define S3C_EDR S3C_HSUDC_REG(0x14) /* EP Direction */ | |
48 | #define S3C_TR S3C_HSUDC_REG(0x18) /* Test Register */ | |
49 | #define S3C_SSR S3C_HSUDC_REG(0x1c) /* System Status */ | |
50 | #define S3C_SSR_DTZIEN_EN (0xff8f) | |
51 | #define S3C_SSR_ERR (0xff80) | |
52 | #define S3C_SSR_VBUSON (1 << 8) | |
53 | #define S3C_SSR_HSP (1 << 4) | |
54 | #define S3C_SSR_SDE (1 << 3) | |
55 | #define S3C_SSR_RESUME (1 << 2) | |
56 | #define S3C_SSR_SUSPEND (1 << 1) | |
57 | #define S3C_SSR_RESET (1 << 0) | |
58 | #define S3C_SCR S3C_HSUDC_REG(0x20) /* System Control */ | |
59 | #define S3C_SCR_DTZIEN_EN (1 << 14) | |
60 | #define S3C_SCR_RRD_EN (1 << 5) | |
61 | #define S3C_SCR_SUS_EN (1 << 1) | |
62 | #define S3C_SCR_RST_EN (1 << 0) | |
63 | #define S3C_EP0SR S3C_HSUDC_REG(0x24) /* EP0 Status */ | |
64 | #define S3C_EP0SR_EP0_LWO (1 << 6) | |
65 | #define S3C_EP0SR_STALL (1 << 4) | |
66 | #define S3C_EP0SR_TX_SUCCESS (1 << 1) | |
67 | #define S3C_EP0SR_RX_SUCCESS (1 << 0) | |
68 | #define S3C_EP0CR S3C_HSUDC_REG(0x28) /* EP0 Control */ | |
69 | #define S3C_BR(_x) S3C_HSUDC_REG(0x60 + (_x * 4)) | |
70 | ||
71 | /* Indexed Registers */ | |
72 | #define S3C_ESR S3C_HSUDC_REG(0x2c) /* EPn Status */ | |
73 | #define S3C_ESR_FLUSH (1 << 6) | |
74 | #define S3C_ESR_STALL (1 << 5) | |
75 | #define S3C_ESR_LWO (1 << 4) | |
76 | #define S3C_ESR_PSIF_ONE (1 << 2) | |
77 | #define S3C_ESR_PSIF_TWO (2 << 2) | |
78 | #define S3C_ESR_TX_SUCCESS (1 << 1) | |
79 | #define S3C_ESR_RX_SUCCESS (1 << 0) | |
80 | #define S3C_ECR S3C_HSUDC_REG(0x30) /* EPn Control */ | |
81 | #define S3C_ECR_DUEN (1 << 7) | |
82 | #define S3C_ECR_FLUSH (1 << 6) | |
83 | #define S3C_ECR_STALL (1 << 1) | |
84 | #define S3C_ECR_IEMS (1 << 0) | |
85 | #define S3C_BRCR S3C_HSUDC_REG(0x34) /* Read Count */ | |
86 | #define S3C_BWCR S3C_HSUDC_REG(0x38) /* Write Count */ | |
87 | #define S3C_MPR S3C_HSUDC_REG(0x3c) /* Max Pkt Size */ | |
88 | ||
89 | #define WAIT_FOR_SETUP (0) | |
90 | #define DATA_STATE_XMIT (1) | |
91 | #define DATA_STATE_RECV (2) | |
92 | ||
93 | static const char * const s3c_hsudc_supply_names[] = { | |
94 | "vdda", /* analog phy supply, 3.3V */ | |
95 | "vddi", /* digital phy supply, 1.2V */ | |
96 | "vddosc", /* oscillator supply, 1.8V - 3.3V */ | |
97 | }; | |
98 | ||
99 | /** | |
100 | * struct s3c_hsudc_ep - Endpoint representation used by driver. | |
101 | * @ep: USB gadget layer representation of device endpoint. | |
102 | * @name: Endpoint name (as required by ep autoconfiguration). | |
103 | * @dev: Reference to the device controller to which this EP belongs. | |
104 | * @desc: Endpoint descriptor obtained from the gadget driver. | |
105 | * @queue: Transfer request queue for the endpoint. | |
106 | * @stopped: Maintains state of endpoint, set if EP is halted. | |
107 | * @bEndpointAddress: EP address (including direction bit). | |
108 | * @fifo: Base address of EP FIFO. | |
109 | */ | |
110 | struct s3c_hsudc_ep { | |
111 | struct usb_ep ep; | |
112 | char name[20]; | |
113 | struct s3c_hsudc *dev; | |
114 | struct list_head queue; | |
115 | u8 stopped; | |
116 | u8 wedge; | |
117 | u8 bEndpointAddress; | |
118 | void __iomem *fifo; | |
119 | }; | |
120 | ||
121 | /** | |
122 | * struct s3c_hsudc_req - Driver encapsulation of USB gadget transfer request. | |
123 | * @req: Reference to USB gadget transfer request. | |
124 | * @queue: Used for inserting this request to the endpoint request queue. | |
125 | */ | |
126 | struct s3c_hsudc_req { | |
127 | struct usb_request req; | |
128 | struct list_head queue; | |
129 | }; | |
130 | ||
131 | /** | |
132 | * struct s3c_hsudc - Driver's abstraction of the device controller. | |
133 | * @gadget: Instance of usb_gadget which is referenced by gadget driver. | |
134 | * @driver: Reference to currenty active gadget driver. | |
135 | * @dev: The device reference used by probe function. | |
136 | * @lock: Lock to synchronize the usage of Endpoints (EP's are indexed). | |
137 | * @regs: Remapped base address of controller's register space. | |
138 | * irq: IRQ number used by the controller. | |
139 | * uclk: Reference to the controller clock. | |
140 | * ep0state: Current state of EP0. | |
141 | * ep: List of endpoints supported by the controller. | |
142 | */ | |
143 | struct s3c_hsudc { | |
144 | struct usb_gadget gadget; | |
145 | struct usb_gadget_driver *driver; | |
146 | struct device *dev; | |
147 | struct s3c24xx_hsudc_platdata *pd; | |
148 | struct usb_phy *transceiver; | |
149 | struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsudc_supply_names)]; | |
150 | spinlock_t lock; | |
151 | void __iomem *regs; | |
152 | int irq; | |
153 | struct clk *uclk; | |
154 | int ep0state; | |
155 | struct s3c_hsudc_ep ep[]; | |
156 | }; | |
157 | ||
158 | #define ep_maxpacket(_ep) ((_ep)->ep.maxpacket) | |
159 | #define ep_is_in(_ep) ((_ep)->bEndpointAddress & USB_DIR_IN) | |
160 | #define ep_index(_ep) ((_ep)->bEndpointAddress & \ | |
161 | USB_ENDPOINT_NUMBER_MASK) | |
162 | ||
163 | static const char driver_name[] = "s3c-udc"; | |
164 | static const char ep0name[] = "ep0-control"; | |
165 | ||
166 | static inline struct s3c_hsudc_req *our_req(struct usb_request *req) | |
167 | { | |
168 | return container_of(req, struct s3c_hsudc_req, req); | |
169 | } | |
170 | ||
171 | static inline struct s3c_hsudc_ep *our_ep(struct usb_ep *ep) | |
172 | { | |
173 | return container_of(ep, struct s3c_hsudc_ep, ep); | |
174 | } | |
175 | ||
176 | static inline struct s3c_hsudc *to_hsudc(struct usb_gadget *gadget) | |
177 | { | |
178 | return container_of(gadget, struct s3c_hsudc, gadget); | |
179 | } | |
180 | ||
181 | static inline void set_index(struct s3c_hsudc *hsudc, int ep_addr) | |
182 | { | |
183 | ep_addr &= USB_ENDPOINT_NUMBER_MASK; | |
184 | writel(ep_addr, hsudc->regs + S3C_IR); | |
185 | } | |
186 | ||
187 | static inline void __orr32(void __iomem *ptr, u32 val) | |
188 | { | |
189 | writel(readl(ptr) | val, ptr); | |
190 | } | |
191 | ||
192 | static void s3c_hsudc_init_phy(void) | |
193 | { | |
194 | u32 cfg; | |
195 | ||
196 | cfg = readl(S3C2443_PWRCFG) | S3C2443_PWRCFG_USBPHY; | |
197 | writel(cfg, S3C2443_PWRCFG); | |
198 | ||
199 | cfg = readl(S3C2443_URSTCON); | |
200 | cfg |= (S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST); | |
201 | writel(cfg, S3C2443_URSTCON); | |
202 | mdelay(1); | |
203 | ||
204 | cfg = readl(S3C2443_URSTCON); | |
205 | cfg &= ~(S3C2443_URSTCON_FUNCRST | S3C2443_URSTCON_PHYRST); | |
206 | writel(cfg, S3C2443_URSTCON); | |
207 | ||
208 | cfg = readl(S3C2443_PHYCTRL); | |
209 | cfg &= ~(S3C2443_PHYCTRL_CLKSEL | S3C2443_PHYCTRL_DSPORT); | |
210 | cfg |= (S3C2443_PHYCTRL_EXTCLK | S3C2443_PHYCTRL_PLLSEL); | |
211 | writel(cfg, S3C2443_PHYCTRL); | |
212 | ||
213 | cfg = readl(S3C2443_PHYPWR); | |
214 | cfg &= ~(S3C2443_PHYPWR_FSUSPEND | S3C2443_PHYPWR_PLL_PWRDN | | |
215 | S3C2443_PHYPWR_XO_ON | S3C2443_PHYPWR_PLL_REFCLK | | |
216 | S3C2443_PHYPWR_ANALOG_PD); | |
217 | cfg |= S3C2443_PHYPWR_COMMON_ON; | |
218 | writel(cfg, S3C2443_PHYPWR); | |
219 | ||
220 | cfg = readl(S3C2443_UCLKCON); | |
221 | cfg |= (S3C2443_UCLKCON_DETECT_VBUS | S3C2443_UCLKCON_FUNC_CLKEN | | |
222 | S3C2443_UCLKCON_TCLKEN); | |
223 | writel(cfg, S3C2443_UCLKCON); | |
224 | } | |
225 | ||
226 | static void s3c_hsudc_uninit_phy(void) | |
227 | { | |
228 | u32 cfg; | |
229 | ||
230 | cfg = readl(S3C2443_PWRCFG) & ~S3C2443_PWRCFG_USBPHY; | |
231 | writel(cfg, S3C2443_PWRCFG); | |
232 | ||
233 | writel(S3C2443_PHYPWR_FSUSPEND, S3C2443_PHYPWR); | |
234 | ||
235 | cfg = readl(S3C2443_UCLKCON) & ~S3C2443_UCLKCON_FUNC_CLKEN; | |
236 | writel(cfg, S3C2443_UCLKCON); | |
237 | } | |
238 | ||
239 | /** | |
240 | * s3c_hsudc_complete_request - Complete a transfer request. | |
241 | * @hsep: Endpoint to which the request belongs. | |
242 | * @hsreq: Transfer request to be completed. | |
243 | * @status: Transfer completion status for the transfer request. | |
244 | */ | |
245 | static void s3c_hsudc_complete_request(struct s3c_hsudc_ep *hsep, | |
246 | struct s3c_hsudc_req *hsreq, int status) | |
247 | { | |
248 | unsigned int stopped = hsep->stopped; | |
249 | struct s3c_hsudc *hsudc = hsep->dev; | |
250 | ||
251 | list_del_init(&hsreq->queue); | |
252 | hsreq->req.status = status; | |
253 | ||
254 | if (!ep_index(hsep)) { | |
255 | hsudc->ep0state = WAIT_FOR_SETUP; | |
256 | hsep->bEndpointAddress &= ~USB_DIR_IN; | |
257 | } | |
258 | ||
259 | hsep->stopped = 1; | |
260 | spin_unlock(&hsudc->lock); | |
261 | if (hsreq->req.complete != NULL) | |
262 | hsreq->req.complete(&hsep->ep, &hsreq->req); | |
263 | spin_lock(&hsudc->lock); | |
264 | hsep->stopped = stopped; | |
265 | } | |
266 | ||
267 | /** | |
268 | * s3c_hsudc_nuke_ep - Terminate all requests queued for a endpoint. | |
269 | * @hsep: Endpoint for which queued requests have to be terminated. | |
270 | * @status: Transfer completion status for the transfer request. | |
271 | */ | |
272 | static void s3c_hsudc_nuke_ep(struct s3c_hsudc_ep *hsep, int status) | |
273 | { | |
274 | struct s3c_hsudc_req *hsreq; | |
275 | ||
276 | while (!list_empty(&hsep->queue)) { | |
277 | hsreq = list_entry(hsep->queue.next, | |
278 | struct s3c_hsudc_req, queue); | |
279 | s3c_hsudc_complete_request(hsep, hsreq, status); | |
280 | } | |
281 | } | |
282 | ||
283 | /** | |
284 | * s3c_hsudc_stop_activity - Stop activity on all endpoints. | |
285 | * @hsudc: Device controller for which EP activity is to be stopped. | |
286 | * @driver: Reference to the gadget driver which is currently active. | |
287 | * | |
288 | * All the endpoints are stopped and any pending transfer requests if any on | |
289 | * the endpoint are terminated. | |
290 | */ | |
291 | static void s3c_hsudc_stop_activity(struct s3c_hsudc *hsudc) | |
292 | { | |
293 | struct s3c_hsudc_ep *hsep; | |
294 | int epnum; | |
295 | ||
296 | hsudc->gadget.speed = USB_SPEED_UNKNOWN; | |
297 | ||
298 | for (epnum = 0; epnum < hsudc->pd->epnum; epnum++) { | |
299 | hsep = &hsudc->ep[epnum]; | |
300 | hsep->stopped = 1; | |
301 | s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN); | |
302 | } | |
303 | } | |
304 | ||
305 | /** | |
306 | * s3c_hsudc_read_setup_pkt - Read the received setup packet from EP0 fifo. | |
307 | * @hsudc: Device controller from which setup packet is to be read. | |
308 | * @buf: The buffer into which the setup packet is read. | |
309 | * | |
310 | * The setup packet received in the EP0 fifo is read and stored into a | |
311 | * given buffer address. | |
312 | */ | |
313 | ||
314 | static void s3c_hsudc_read_setup_pkt(struct s3c_hsudc *hsudc, u16 *buf) | |
315 | { | |
316 | int count; | |
317 | ||
318 | count = readl(hsudc->regs + S3C_BRCR); | |
319 | while (count--) | |
320 | *buf++ = (u16)readl(hsudc->regs + S3C_BR(0)); | |
321 | ||
322 | writel(S3C_EP0SR_RX_SUCCESS, hsudc->regs + S3C_EP0SR); | |
323 | } | |
324 | ||
325 | /** | |
326 | * s3c_hsudc_write_fifo - Write next chunk of transfer data to EP fifo. | |
327 | * @hsep: Endpoint to which the data is to be written. | |
328 | * @hsreq: Transfer request from which the next chunk of data is written. | |
329 | * | |
330 | * Write the next chunk of data from a transfer request to the endpoint FIFO. | |
331 | * If the transfer request completes, 1 is returned, otherwise 0 is returned. | |
332 | */ | |
333 | static int s3c_hsudc_write_fifo(struct s3c_hsudc_ep *hsep, | |
334 | struct s3c_hsudc_req *hsreq) | |
335 | { | |
336 | u16 *buf; | |
337 | u32 max = ep_maxpacket(hsep); | |
338 | u32 count, length; | |
339 | bool is_last; | |
340 | void __iomem *fifo = hsep->fifo; | |
341 | ||
342 | buf = hsreq->req.buf + hsreq->req.actual; | |
343 | prefetch(buf); | |
344 | ||
345 | length = hsreq->req.length - hsreq->req.actual; | |
346 | length = min(length, max); | |
347 | hsreq->req.actual += length; | |
348 | ||
349 | writel(length, hsep->dev->regs + S3C_BWCR); | |
350 | for (count = 0; count < length; count += 2) | |
351 | writel(*buf++, fifo); | |
352 | ||
353 | if (count != max) { | |
354 | is_last = true; | |
355 | } else { | |
356 | if (hsreq->req.length != hsreq->req.actual || hsreq->req.zero) | |
357 | is_last = false; | |
358 | else | |
359 | is_last = true; | |
360 | } | |
361 | ||
362 | if (is_last) { | |
363 | s3c_hsudc_complete_request(hsep, hsreq, 0); | |
364 | return 1; | |
365 | } | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | /** | |
371 | * s3c_hsudc_read_fifo - Read the next chunk of data from EP fifo. | |
372 | * @hsep: Endpoint from which the data is to be read. | |
373 | * @hsreq: Transfer request to which the next chunk of data read is written. | |
374 | * | |
375 | * Read the next chunk of data from the endpoint FIFO and a write it to the | |
376 | * transfer request buffer. If the transfer request completes, 1 is returned, | |
377 | * otherwise 0 is returned. | |
378 | */ | |
379 | static int s3c_hsudc_read_fifo(struct s3c_hsudc_ep *hsep, | |
380 | struct s3c_hsudc_req *hsreq) | |
381 | { | |
382 | struct s3c_hsudc *hsudc = hsep->dev; | |
383 | u32 csr, offset; | |
384 | u16 *buf, word; | |
385 | u32 buflen, rcnt, rlen; | |
386 | void __iomem *fifo = hsep->fifo; | |
387 | u32 is_short = 0; | |
388 | ||
389 | offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR; | |
390 | csr = readl(hsudc->regs + offset); | |
391 | if (!(csr & S3C_ESR_RX_SUCCESS)) | |
392 | return -EINVAL; | |
393 | ||
394 | buf = hsreq->req.buf + hsreq->req.actual; | |
395 | prefetchw(buf); | |
396 | buflen = hsreq->req.length - hsreq->req.actual; | |
397 | ||
398 | rcnt = readl(hsudc->regs + S3C_BRCR); | |
399 | rlen = (csr & S3C_ESR_LWO) ? (rcnt * 2 - 1) : (rcnt * 2); | |
400 | ||
401 | hsreq->req.actual += min(rlen, buflen); | |
402 | is_short = (rlen < hsep->ep.maxpacket); | |
403 | ||
404 | while (rcnt-- != 0) { | |
405 | word = (u16)readl(fifo); | |
406 | if (buflen) { | |
407 | *buf++ = word; | |
408 | buflen--; | |
409 | } else { | |
410 | hsreq->req.status = -EOVERFLOW; | |
411 | } | |
412 | } | |
413 | ||
414 | writel(S3C_ESR_RX_SUCCESS, hsudc->regs + offset); | |
415 | ||
416 | if (is_short || hsreq->req.actual == hsreq->req.length) { | |
417 | s3c_hsudc_complete_request(hsep, hsreq, 0); | |
418 | return 1; | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /** | |
425 | * s3c_hsudc_epin_intr - Handle in-endpoint interrupt. | |
426 | * @hsudc - Device controller for which the interrupt is to be handled. | |
427 | * @ep_idx - Endpoint number on which an interrupt is pending. | |
428 | * | |
429 | * Handles interrupt for a in-endpoint. The interrupts that are handled are | |
430 | * stall and data transmit complete interrupt. | |
431 | */ | |
432 | static void s3c_hsudc_epin_intr(struct s3c_hsudc *hsudc, u32 ep_idx) | |
433 | { | |
434 | struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx]; | |
435 | struct s3c_hsudc_req *hsreq; | |
436 | u32 csr; | |
437 | ||
438 | csr = readl((u32)hsudc->regs + S3C_ESR); | |
439 | if (csr & S3C_ESR_STALL) { | |
440 | writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR); | |
441 | return; | |
442 | } | |
443 | ||
444 | if (csr & S3C_ESR_TX_SUCCESS) { | |
445 | writel(S3C_ESR_TX_SUCCESS, hsudc->regs + S3C_ESR); | |
446 | if (list_empty(&hsep->queue)) | |
447 | return; | |
448 | ||
449 | hsreq = list_entry(hsep->queue.next, | |
450 | struct s3c_hsudc_req, queue); | |
451 | if ((s3c_hsudc_write_fifo(hsep, hsreq) == 0) && | |
452 | (csr & S3C_ESR_PSIF_TWO)) | |
453 | s3c_hsudc_write_fifo(hsep, hsreq); | |
454 | } | |
455 | } | |
456 | ||
457 | /** | |
458 | * s3c_hsudc_epout_intr - Handle out-endpoint interrupt. | |
459 | * @hsudc - Device controller for which the interrupt is to be handled. | |
460 | * @ep_idx - Endpoint number on which an interrupt is pending. | |
461 | * | |
462 | * Handles interrupt for a out-endpoint. The interrupts that are handled are | |
463 | * stall, flush and data ready interrupt. | |
464 | */ | |
465 | static void s3c_hsudc_epout_intr(struct s3c_hsudc *hsudc, u32 ep_idx) | |
466 | { | |
467 | struct s3c_hsudc_ep *hsep = &hsudc->ep[ep_idx]; | |
468 | struct s3c_hsudc_req *hsreq; | |
469 | u32 csr; | |
470 | ||
471 | csr = readl((u32)hsudc->regs + S3C_ESR); | |
472 | if (csr & S3C_ESR_STALL) { | |
473 | writel(S3C_ESR_STALL, hsudc->regs + S3C_ESR); | |
474 | return; | |
475 | } | |
476 | ||
477 | if (csr & S3C_ESR_FLUSH) { | |
478 | __orr32(hsudc->regs + S3C_ECR, S3C_ECR_FLUSH); | |
479 | return; | |
480 | } | |
481 | ||
482 | if (csr & S3C_ESR_RX_SUCCESS) { | |
483 | if (list_empty(&hsep->queue)) | |
484 | return; | |
485 | ||
486 | hsreq = list_entry(hsep->queue.next, | |
487 | struct s3c_hsudc_req, queue); | |
488 | if (((s3c_hsudc_read_fifo(hsep, hsreq)) == 0) && | |
489 | (csr & S3C_ESR_PSIF_TWO)) | |
490 | s3c_hsudc_read_fifo(hsep, hsreq); | |
491 | } | |
492 | } | |
493 | ||
494 | /** s3c_hsudc_set_halt - Set or clear a endpoint halt. | |
495 | * @_ep: Endpoint on which halt has to be set or cleared. | |
496 | * @value: 1 for setting halt on endpoint, 0 to clear halt. | |
497 | * | |
498 | * Set or clear endpoint halt. If halt is set, the endpoint is stopped. | |
499 | * If halt is cleared, for in-endpoints, if there are any pending | |
500 | * transfer requests, transfers are started. | |
501 | */ | |
502 | static int s3c_hsudc_set_halt(struct usb_ep *_ep, int value) | |
503 | { | |
504 | struct s3c_hsudc_ep *hsep = our_ep(_ep); | |
505 | struct s3c_hsudc *hsudc = hsep->dev; | |
506 | struct s3c_hsudc_req *hsreq; | |
507 | unsigned long irqflags; | |
508 | u32 ecr; | |
509 | u32 offset; | |
510 | ||
511 | if (value && ep_is_in(hsep) && !list_empty(&hsep->queue)) | |
512 | return -EAGAIN; | |
513 | ||
514 | spin_lock_irqsave(&hsudc->lock, irqflags); | |
515 | set_index(hsudc, ep_index(hsep)); | |
516 | offset = (ep_index(hsep)) ? S3C_ECR : S3C_EP0CR; | |
517 | ecr = readl(hsudc->regs + offset); | |
518 | ||
519 | if (value) { | |
520 | ecr |= S3C_ECR_STALL; | |
521 | if (ep_index(hsep)) | |
522 | ecr |= S3C_ECR_FLUSH; | |
523 | hsep->stopped = 1; | |
524 | } else { | |
525 | ecr &= ~S3C_ECR_STALL; | |
526 | hsep->stopped = hsep->wedge = 0; | |
527 | } | |
528 | writel(ecr, hsudc->regs + offset); | |
529 | ||
530 | if (ep_is_in(hsep) && !list_empty(&hsep->queue) && !value) { | |
531 | hsreq = list_entry(hsep->queue.next, | |
532 | struct s3c_hsudc_req, queue); | |
533 | if (hsreq) | |
534 | s3c_hsudc_write_fifo(hsep, hsreq); | |
535 | } | |
536 | ||
537 | spin_unlock_irqrestore(&hsudc->lock, irqflags); | |
538 | return 0; | |
539 | } | |
540 | ||
541 | /** s3c_hsudc_set_wedge - Sets the halt feature with the clear requests ignored | |
542 | * @_ep: Endpoint on which wedge has to be set. | |
543 | * | |
544 | * Sets the halt feature with the clear requests ignored. | |
545 | */ | |
546 | static int s3c_hsudc_set_wedge(struct usb_ep *_ep) | |
547 | { | |
548 | struct s3c_hsudc_ep *hsep = our_ep(_ep); | |
549 | ||
550 | if (!hsep) | |
551 | return -EINVAL; | |
552 | ||
553 | hsep->wedge = 1; | |
554 | return usb_ep_set_halt(_ep); | |
555 | } | |
556 | ||
557 | /** s3c_hsudc_handle_reqfeat - Handle set feature or clear feature requests. | |
558 | * @_ep: Device controller on which the set/clear feature needs to be handled. | |
559 | * @ctrl: Control request as received on the endpoint 0. | |
560 | * | |
561 | * Handle set feature or clear feature control requests on the control endpoint. | |
562 | */ | |
563 | static int s3c_hsudc_handle_reqfeat(struct s3c_hsudc *hsudc, | |
564 | struct usb_ctrlrequest *ctrl) | |
565 | { | |
566 | struct s3c_hsudc_ep *hsep; | |
567 | bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE); | |
568 | u8 ep_num = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK; | |
569 | ||
570 | if (ctrl->bRequestType == USB_RECIP_ENDPOINT) { | |
571 | hsep = &hsudc->ep[ep_num]; | |
572 | switch (le16_to_cpu(ctrl->wValue)) { | |
573 | case USB_ENDPOINT_HALT: | |
574 | if (set || (!set && !hsep->wedge)) | |
575 | s3c_hsudc_set_halt(&hsep->ep, set); | |
576 | return 0; | |
577 | } | |
578 | } | |
579 | ||
580 | return -ENOENT; | |
581 | } | |
582 | ||
583 | /** | |
584 | * s3c_hsudc_process_req_status - Handle get status control request. | |
585 | * @hsudc: Device controller on which get status request has be handled. | |
586 | * @ctrl: Control request as received on the endpoint 0. | |
587 | * | |
588 | * Handle get status control request received on control endpoint. | |
589 | */ | |
590 | static void s3c_hsudc_process_req_status(struct s3c_hsudc *hsudc, | |
591 | struct usb_ctrlrequest *ctrl) | |
592 | { | |
593 | struct s3c_hsudc_ep *hsep0 = &hsudc->ep[0]; | |
594 | struct s3c_hsudc_req hsreq; | |
595 | struct s3c_hsudc_ep *hsep; | |
596 | __le16 reply; | |
597 | u8 epnum; | |
598 | ||
599 | switch (ctrl->bRequestType & USB_RECIP_MASK) { | |
600 | case USB_RECIP_DEVICE: | |
601 | reply = cpu_to_le16(0); | |
602 | break; | |
603 | ||
604 | case USB_RECIP_INTERFACE: | |
605 | reply = cpu_to_le16(0); | |
606 | break; | |
607 | ||
608 | case USB_RECIP_ENDPOINT: | |
609 | epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK; | |
610 | hsep = &hsudc->ep[epnum]; | |
611 | reply = cpu_to_le16(hsep->stopped ? 1 : 0); | |
612 | break; | |
613 | } | |
614 | ||
615 | INIT_LIST_HEAD(&hsreq.queue); | |
616 | hsreq.req.length = 2; | |
617 | hsreq.req.buf = &reply; | |
618 | hsreq.req.actual = 0; | |
619 | hsreq.req.complete = NULL; | |
620 | s3c_hsudc_write_fifo(hsep0, &hsreq); | |
621 | } | |
622 | ||
623 | /** | |
624 | * s3c_hsudc_process_setup - Process control request received on endpoint 0. | |
625 | * @hsudc: Device controller on which control request has been received. | |
626 | * | |
627 | * Read the control request received on endpoint 0, decode it and handle | |
628 | * the request. | |
629 | */ | |
630 | static void s3c_hsudc_process_setup(struct s3c_hsudc *hsudc) | |
631 | { | |
632 | struct s3c_hsudc_ep *hsep = &hsudc->ep[0]; | |
633 | struct usb_ctrlrequest ctrl = {0}; | |
634 | int ret; | |
635 | ||
636 | s3c_hsudc_nuke_ep(hsep, -EPROTO); | |
637 | s3c_hsudc_read_setup_pkt(hsudc, (u16 *)&ctrl); | |
638 | ||
639 | if (ctrl.bRequestType & USB_DIR_IN) { | |
640 | hsep->bEndpointAddress |= USB_DIR_IN; | |
641 | hsudc->ep0state = DATA_STATE_XMIT; | |
642 | } else { | |
643 | hsep->bEndpointAddress &= ~USB_DIR_IN; | |
644 | hsudc->ep0state = DATA_STATE_RECV; | |
645 | } | |
646 | ||
647 | switch (ctrl.bRequest) { | |
648 | case USB_REQ_SET_ADDRESS: | |
649 | if (ctrl.bRequestType != (USB_TYPE_STANDARD | USB_RECIP_DEVICE)) | |
650 | break; | |
651 | hsudc->ep0state = WAIT_FOR_SETUP; | |
652 | return; | |
653 | ||
654 | case USB_REQ_GET_STATUS: | |
655 | if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD) | |
656 | break; | |
657 | s3c_hsudc_process_req_status(hsudc, &ctrl); | |
658 | return; | |
659 | ||
660 | case USB_REQ_SET_FEATURE: | |
661 | case USB_REQ_CLEAR_FEATURE: | |
662 | if ((ctrl.bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD) | |
663 | break; | |
664 | s3c_hsudc_handle_reqfeat(hsudc, &ctrl); | |
665 | hsudc->ep0state = WAIT_FOR_SETUP; | |
666 | return; | |
667 | } | |
668 | ||
669 | if (hsudc->driver) { | |
670 | spin_unlock(&hsudc->lock); | |
671 | ret = hsudc->driver->setup(&hsudc->gadget, &ctrl); | |
672 | spin_lock(&hsudc->lock); | |
673 | ||
674 | if (ctrl.bRequest == USB_REQ_SET_CONFIGURATION) { | |
675 | hsep->bEndpointAddress &= ~USB_DIR_IN; | |
676 | hsudc->ep0state = WAIT_FOR_SETUP; | |
677 | } | |
678 | ||
679 | if (ret < 0) { | |
680 | dev_err(hsudc->dev, "setup failed, returned %d\n", | |
681 | ret); | |
682 | s3c_hsudc_set_halt(&hsep->ep, 1); | |
683 | hsudc->ep0state = WAIT_FOR_SETUP; | |
684 | hsep->bEndpointAddress &= ~USB_DIR_IN; | |
685 | } | |
686 | } | |
687 | } | |
688 | ||
689 | /** s3c_hsudc_handle_ep0_intr - Handle endpoint 0 interrupt. | |
690 | * @hsudc: Device controller on which endpoint 0 interrupt has occured. | |
691 | * | |
692 | * Handle endpoint 0 interrupt when it occurs. EP0 interrupt could occur | |
693 | * when a stall handshake is sent to host or data is sent/received on | |
694 | * endpoint 0. | |
695 | */ | |
696 | static void s3c_hsudc_handle_ep0_intr(struct s3c_hsudc *hsudc) | |
697 | { | |
698 | struct s3c_hsudc_ep *hsep = &hsudc->ep[0]; | |
699 | struct s3c_hsudc_req *hsreq; | |
700 | u32 csr = readl(hsudc->regs + S3C_EP0SR); | |
701 | u32 ecr; | |
702 | ||
703 | if (csr & S3C_EP0SR_STALL) { | |
704 | ecr = readl(hsudc->regs + S3C_EP0CR); | |
705 | ecr &= ~(S3C_ECR_STALL | S3C_ECR_FLUSH); | |
706 | writel(ecr, hsudc->regs + S3C_EP0CR); | |
707 | ||
708 | writel(S3C_EP0SR_STALL, hsudc->regs + S3C_EP0SR); | |
709 | hsep->stopped = 0; | |
710 | ||
711 | s3c_hsudc_nuke_ep(hsep, -ECONNABORTED); | |
712 | hsudc->ep0state = WAIT_FOR_SETUP; | |
713 | hsep->bEndpointAddress &= ~USB_DIR_IN; | |
714 | return; | |
715 | } | |
716 | ||
717 | if (csr & S3C_EP0SR_TX_SUCCESS) { | |
718 | writel(S3C_EP0SR_TX_SUCCESS, hsudc->regs + S3C_EP0SR); | |
719 | if (ep_is_in(hsep)) { | |
720 | if (list_empty(&hsep->queue)) | |
721 | return; | |
722 | ||
723 | hsreq = list_entry(hsep->queue.next, | |
724 | struct s3c_hsudc_req, queue); | |
725 | s3c_hsudc_write_fifo(hsep, hsreq); | |
726 | } | |
727 | } | |
728 | ||
729 | if (csr & S3C_EP0SR_RX_SUCCESS) { | |
730 | if (hsudc->ep0state == WAIT_FOR_SETUP) | |
731 | s3c_hsudc_process_setup(hsudc); | |
732 | else { | |
733 | if (!ep_is_in(hsep)) { | |
734 | if (list_empty(&hsep->queue)) | |
735 | return; | |
736 | hsreq = list_entry(hsep->queue.next, | |
737 | struct s3c_hsudc_req, queue); | |
738 | s3c_hsudc_read_fifo(hsep, hsreq); | |
739 | } | |
740 | } | |
741 | } | |
742 | } | |
743 | ||
744 | /** | |
745 | * s3c_hsudc_ep_enable - Enable a endpoint. | |
746 | * @_ep: The endpoint to be enabled. | |
747 | * @desc: Endpoint descriptor. | |
748 | * | |
749 | * Enables a endpoint when called from the gadget driver. Endpoint stall if | |
750 | * any is cleared, transfer type is configured and endpoint interrupt is | |
751 | * enabled. | |
752 | */ | |
753 | static int s3c_hsudc_ep_enable(struct usb_ep *_ep, | |
754 | const struct usb_endpoint_descriptor *desc) | |
755 | { | |
756 | struct s3c_hsudc_ep *hsep; | |
757 | struct s3c_hsudc *hsudc; | |
758 | unsigned long flags; | |
759 | u32 ecr = 0; | |
760 | ||
761 | hsep = our_ep(_ep); | |
762 | if (!_ep || !desc || _ep->name == ep0name | |
763 | || desc->bDescriptorType != USB_DT_ENDPOINT | |
764 | || hsep->bEndpointAddress != desc->bEndpointAddress | |
765 | || ep_maxpacket(hsep) < usb_endpoint_maxp(desc)) | |
766 | return -EINVAL; | |
767 | ||
768 | if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK | |
769 | && usb_endpoint_maxp(desc) != ep_maxpacket(hsep)) | |
770 | || !desc->wMaxPacketSize) | |
771 | return -ERANGE; | |
772 | ||
773 | hsudc = hsep->dev; | |
774 | if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN) | |
775 | return -ESHUTDOWN; | |
776 | ||
777 | spin_lock_irqsave(&hsudc->lock, flags); | |
778 | ||
779 | set_index(hsudc, hsep->bEndpointAddress); | |
780 | ecr |= ((usb_endpoint_xfer_int(desc)) ? S3C_ECR_IEMS : S3C_ECR_DUEN); | |
781 | writel(ecr, hsudc->regs + S3C_ECR); | |
782 | ||
783 | hsep->stopped = hsep->wedge = 0; | |
784 | hsep->ep.desc = desc; | |
785 | hsep->ep.maxpacket = usb_endpoint_maxp(desc); | |
786 | ||
787 | s3c_hsudc_set_halt(_ep, 0); | |
788 | __set_bit(ep_index(hsep), hsudc->regs + S3C_EIER); | |
789 | ||
790 | spin_unlock_irqrestore(&hsudc->lock, flags); | |
791 | return 0; | |
792 | } | |
793 | ||
794 | /** | |
795 | * s3c_hsudc_ep_disable - Disable a endpoint. | |
796 | * @_ep: The endpoint to be disabled. | |
797 | * @desc: Endpoint descriptor. | |
798 | * | |
799 | * Disables a endpoint when called from the gadget driver. | |
800 | */ | |
801 | static int s3c_hsudc_ep_disable(struct usb_ep *_ep) | |
802 | { | |
803 | struct s3c_hsudc_ep *hsep = our_ep(_ep); | |
804 | struct s3c_hsudc *hsudc = hsep->dev; | |
805 | unsigned long flags; | |
806 | ||
807 | if (!_ep || !hsep->ep.desc) | |
808 | return -EINVAL; | |
809 | ||
810 | spin_lock_irqsave(&hsudc->lock, flags); | |
811 | ||
812 | set_index(hsudc, hsep->bEndpointAddress); | |
813 | __clear_bit(ep_index(hsep), hsudc->regs + S3C_EIER); | |
814 | ||
815 | s3c_hsudc_nuke_ep(hsep, -ESHUTDOWN); | |
816 | ||
817 | hsep->ep.desc = NULL; | |
818 | hsep->stopped = 1; | |
819 | ||
820 | spin_unlock_irqrestore(&hsudc->lock, flags); | |
821 | return 0; | |
822 | } | |
823 | ||
824 | /** | |
825 | * s3c_hsudc_alloc_request - Allocate a new request. | |
826 | * @_ep: Endpoint for which request is allocated (not used). | |
827 | * @gfp_flags: Flags used for the allocation. | |
828 | * | |
829 | * Allocates a single transfer request structure when called from gadget driver. | |
830 | */ | |
831 | static struct usb_request *s3c_hsudc_alloc_request(struct usb_ep *_ep, | |
832 | gfp_t gfp_flags) | |
833 | { | |
834 | struct s3c_hsudc_req *hsreq; | |
835 | ||
836 | hsreq = kzalloc(sizeof(*hsreq), gfp_flags); | |
837 | if (!hsreq) | |
838 | return NULL; | |
839 | ||
840 | INIT_LIST_HEAD(&hsreq->queue); | |
841 | return &hsreq->req; | |
842 | } | |
843 | ||
844 | /** | |
845 | * s3c_hsudc_free_request - Deallocate a request. | |
846 | * @ep: Endpoint for which request is deallocated (not used). | |
847 | * @_req: Request to be deallocated. | |
848 | * | |
849 | * Allocates a single transfer request structure when called from gadget driver. | |
850 | */ | |
851 | static void s3c_hsudc_free_request(struct usb_ep *ep, struct usb_request *_req) | |
852 | { | |
853 | struct s3c_hsudc_req *hsreq; | |
854 | ||
855 | hsreq = our_req(_req); | |
856 | WARN_ON(!list_empty(&hsreq->queue)); | |
857 | kfree(hsreq); | |
858 | } | |
859 | ||
860 | /** | |
861 | * s3c_hsudc_queue - Queue a transfer request for the endpoint. | |
862 | * @_ep: Endpoint for which the request is queued. | |
863 | * @_req: Request to be queued. | |
864 | * @gfp_flags: Not used. | |
865 | * | |
866 | * Start or enqueue a request for a endpoint when called from gadget driver. | |
867 | */ | |
868 | static int s3c_hsudc_queue(struct usb_ep *_ep, struct usb_request *_req, | |
869 | gfp_t gfp_flags) | |
870 | { | |
871 | struct s3c_hsudc_req *hsreq; | |
872 | struct s3c_hsudc_ep *hsep; | |
873 | struct s3c_hsudc *hsudc; | |
874 | unsigned long flags; | |
875 | u32 offset; | |
876 | u32 csr; | |
877 | ||
878 | hsreq = our_req(_req); | |
879 | if ((!_req || !_req->complete || !_req->buf || | |
880 | !list_empty(&hsreq->queue))) | |
881 | return -EINVAL; | |
882 | ||
883 | hsep = our_ep(_ep); | |
884 | hsudc = hsep->dev; | |
885 | if (!hsudc->driver || hsudc->gadget.speed == USB_SPEED_UNKNOWN) | |
886 | return -ESHUTDOWN; | |
887 | ||
888 | spin_lock_irqsave(&hsudc->lock, flags); | |
889 | set_index(hsudc, hsep->bEndpointAddress); | |
890 | ||
891 | _req->status = -EINPROGRESS; | |
892 | _req->actual = 0; | |
893 | ||
894 | if (!ep_index(hsep) && _req->length == 0) { | |
895 | hsudc->ep0state = WAIT_FOR_SETUP; | |
896 | s3c_hsudc_complete_request(hsep, hsreq, 0); | |
897 | spin_unlock_irqrestore(&hsudc->lock, flags); | |
898 | return 0; | |
899 | } | |
900 | ||
901 | if (list_empty(&hsep->queue) && !hsep->stopped) { | |
902 | offset = (ep_index(hsep)) ? S3C_ESR : S3C_EP0SR; | |
903 | if (ep_is_in(hsep)) { | |
904 | csr = readl((u32)hsudc->regs + offset); | |
905 | if (!(csr & S3C_ESR_TX_SUCCESS) && | |
906 | (s3c_hsudc_write_fifo(hsep, hsreq) == 1)) | |
907 | hsreq = NULL; | |
908 | } else { | |
909 | csr = readl((u32)hsudc->regs + offset); | |
910 | if ((csr & S3C_ESR_RX_SUCCESS) | |
911 | && (s3c_hsudc_read_fifo(hsep, hsreq) == 1)) | |
912 | hsreq = NULL; | |
913 | } | |
914 | } | |
915 | ||
916 | if (hsreq) | |
917 | list_add_tail(&hsreq->queue, &hsep->queue); | |
918 | ||
919 | spin_unlock_irqrestore(&hsudc->lock, flags); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | /** | |
924 | * s3c_hsudc_dequeue - Dequeue a transfer request from an endpoint. | |
925 | * @_ep: Endpoint from which the request is dequeued. | |
926 | * @_req: Request to be dequeued. | |
927 | * | |
928 | * Dequeue a request from a endpoint when called from gadget driver. | |
929 | */ | |
930 | static int s3c_hsudc_dequeue(struct usb_ep *_ep, struct usb_request *_req) | |
931 | { | |
932 | struct s3c_hsudc_ep *hsep = our_ep(_ep); | |
933 | struct s3c_hsudc *hsudc = hsep->dev; | |
934 | struct s3c_hsudc_req *hsreq; | |
935 | unsigned long flags; | |
936 | ||
937 | hsep = our_ep(_ep); | |
938 | if (!_ep || hsep->ep.name == ep0name) | |
939 | return -EINVAL; | |
940 | ||
941 | spin_lock_irqsave(&hsudc->lock, flags); | |
942 | ||
943 | list_for_each_entry(hsreq, &hsep->queue, queue) { | |
944 | if (&hsreq->req == _req) | |
945 | break; | |
946 | } | |
947 | if (&hsreq->req != _req) { | |
948 | spin_unlock_irqrestore(&hsudc->lock, flags); | |
949 | return -EINVAL; | |
950 | } | |
951 | ||
952 | set_index(hsudc, hsep->bEndpointAddress); | |
953 | s3c_hsudc_complete_request(hsep, hsreq, -ECONNRESET); | |
954 | ||
955 | spin_unlock_irqrestore(&hsudc->lock, flags); | |
956 | return 0; | |
957 | } | |
958 | ||
959 | static struct usb_ep_ops s3c_hsudc_ep_ops = { | |
960 | .enable = s3c_hsudc_ep_enable, | |
961 | .disable = s3c_hsudc_ep_disable, | |
962 | .alloc_request = s3c_hsudc_alloc_request, | |
963 | .free_request = s3c_hsudc_free_request, | |
964 | .queue = s3c_hsudc_queue, | |
965 | .dequeue = s3c_hsudc_dequeue, | |
966 | .set_halt = s3c_hsudc_set_halt, | |
967 | .set_wedge = s3c_hsudc_set_wedge, | |
968 | }; | |
969 | ||
970 | /** | |
971 | * s3c_hsudc_initep - Initialize a endpoint to default state. | |
972 | * @hsudc - Reference to the device controller. | |
973 | * @hsep - Endpoint to be initialized. | |
974 | * @epnum - Address to be assigned to the endpoint. | |
975 | * | |
976 | * Initialize a endpoint with default configuration. | |
977 | */ | |
978 | static void s3c_hsudc_initep(struct s3c_hsudc *hsudc, | |
979 | struct s3c_hsudc_ep *hsep, int epnum) | |
980 | { | |
981 | char *dir; | |
982 | ||
983 | if ((epnum % 2) == 0) { | |
984 | dir = "out"; | |
985 | } else { | |
986 | dir = "in"; | |
987 | hsep->bEndpointAddress = USB_DIR_IN; | |
988 | } | |
989 | ||
990 | hsep->bEndpointAddress |= epnum; | |
991 | if (epnum) | |
992 | snprintf(hsep->name, sizeof(hsep->name), "ep%d%s", epnum, dir); | |
993 | else | |
994 | snprintf(hsep->name, sizeof(hsep->name), "%s", ep0name); | |
995 | ||
996 | INIT_LIST_HEAD(&hsep->queue); | |
997 | INIT_LIST_HEAD(&hsep->ep.ep_list); | |
998 | if (epnum) | |
999 | list_add_tail(&hsep->ep.ep_list, &hsudc->gadget.ep_list); | |
1000 | ||
1001 | hsep->dev = hsudc; | |
1002 | hsep->ep.name = hsep->name; | |
1003 | hsep->ep.maxpacket = epnum ? 512 : 64; | |
1004 | hsep->ep.ops = &s3c_hsudc_ep_ops; | |
1005 | hsep->fifo = hsudc->regs + S3C_BR(epnum); | |
1006 | hsep->ep.desc = NULL; | |
1007 | hsep->stopped = 0; | |
1008 | hsep->wedge = 0; | |
1009 | ||
1010 | set_index(hsudc, epnum); | |
1011 | writel(hsep->ep.maxpacket, hsudc->regs + S3C_MPR); | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * s3c_hsudc_setup_ep - Configure all endpoints to default state. | |
1016 | * @hsudc: Reference to device controller. | |
1017 | * | |
1018 | * Configures all endpoints to default state. | |
1019 | */ | |
1020 | static void s3c_hsudc_setup_ep(struct s3c_hsudc *hsudc) | |
1021 | { | |
1022 | int epnum; | |
1023 | ||
1024 | hsudc->ep0state = WAIT_FOR_SETUP; | |
1025 | INIT_LIST_HEAD(&hsudc->gadget.ep_list); | |
1026 | for (epnum = 0; epnum < hsudc->pd->epnum; epnum++) | |
1027 | s3c_hsudc_initep(hsudc, &hsudc->ep[epnum], epnum); | |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * s3c_hsudc_reconfig - Reconfigure the device controller to default state. | |
1032 | * @hsudc: Reference to device controller. | |
1033 | * | |
1034 | * Reconfigures the device controller registers to a default state. | |
1035 | */ | |
1036 | static void s3c_hsudc_reconfig(struct s3c_hsudc *hsudc) | |
1037 | { | |
1038 | writel(0xAA, hsudc->regs + S3C_EDR); | |
1039 | writel(1, hsudc->regs + S3C_EIER); | |
1040 | writel(0, hsudc->regs + S3C_TR); | |
1041 | writel(S3C_SCR_DTZIEN_EN | S3C_SCR_RRD_EN | S3C_SCR_SUS_EN | | |
1042 | S3C_SCR_RST_EN, hsudc->regs + S3C_SCR); | |
1043 | writel(0, hsudc->regs + S3C_EP0CR); | |
1044 | ||
1045 | s3c_hsudc_setup_ep(hsudc); | |
1046 | } | |
1047 | ||
1048 | /** | |
1049 | * s3c_hsudc_irq - Interrupt handler for device controller. | |
1050 | * @irq: Not used. | |
1051 | * @_dev: Reference to the device controller. | |
1052 | * | |
1053 | * Interrupt handler for the device controller. This handler handles controller | |
1054 | * interrupts and endpoint interrupts. | |
1055 | */ | |
1056 | static irqreturn_t s3c_hsudc_irq(int irq, void *_dev) | |
1057 | { | |
1058 | struct s3c_hsudc *hsudc = _dev; | |
1059 | struct s3c_hsudc_ep *hsep; | |
1060 | u32 ep_intr; | |
1061 | u32 sys_status; | |
1062 | u32 ep_idx; | |
1063 | ||
1064 | spin_lock(&hsudc->lock); | |
1065 | ||
1066 | sys_status = readl(hsudc->regs + S3C_SSR); | |
1067 | ep_intr = readl(hsudc->regs + S3C_EIR) & 0x3FF; | |
1068 | ||
1069 | if (!ep_intr && !(sys_status & S3C_SSR_DTZIEN_EN)) { | |
1070 | spin_unlock(&hsudc->lock); | |
1071 | return IRQ_HANDLED; | |
1072 | } | |
1073 | ||
1074 | if (sys_status) { | |
1075 | if (sys_status & S3C_SSR_VBUSON) | |
1076 | writel(S3C_SSR_VBUSON, hsudc->regs + S3C_SSR); | |
1077 | ||
1078 | if (sys_status & S3C_SSR_ERR) | |
1079 | writel(S3C_SSR_ERR, hsudc->regs + S3C_SSR); | |
1080 | ||
1081 | if (sys_status & S3C_SSR_SDE) { | |
1082 | writel(S3C_SSR_SDE, hsudc->regs + S3C_SSR); | |
1083 | hsudc->gadget.speed = (sys_status & S3C_SSR_HSP) ? | |
1084 | USB_SPEED_HIGH : USB_SPEED_FULL; | |
1085 | } | |
1086 | ||
1087 | if (sys_status & S3C_SSR_SUSPEND) { | |
1088 | writel(S3C_SSR_SUSPEND, hsudc->regs + S3C_SSR); | |
1089 | if (hsudc->gadget.speed != USB_SPEED_UNKNOWN | |
1090 | && hsudc->driver && hsudc->driver->suspend) | |
1091 | hsudc->driver->suspend(&hsudc->gadget); | |
1092 | } | |
1093 | ||
1094 | if (sys_status & S3C_SSR_RESUME) { | |
1095 | writel(S3C_SSR_RESUME, hsudc->regs + S3C_SSR); | |
1096 | if (hsudc->gadget.speed != USB_SPEED_UNKNOWN | |
1097 | && hsudc->driver && hsudc->driver->resume) | |
1098 | hsudc->driver->resume(&hsudc->gadget); | |
1099 | } | |
1100 | ||
1101 | if (sys_status & S3C_SSR_RESET) { | |
1102 | writel(S3C_SSR_RESET, hsudc->regs + S3C_SSR); | |
1103 | for (ep_idx = 0; ep_idx < hsudc->pd->epnum; ep_idx++) { | |
1104 | hsep = &hsudc->ep[ep_idx]; | |
1105 | hsep->stopped = 1; | |
1106 | s3c_hsudc_nuke_ep(hsep, -ECONNRESET); | |
1107 | } | |
1108 | s3c_hsudc_reconfig(hsudc); | |
1109 | hsudc->ep0state = WAIT_FOR_SETUP; | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | if (ep_intr & S3C_EIR_EP0) { | |
1114 | writel(S3C_EIR_EP0, hsudc->regs + S3C_EIR); | |
1115 | set_index(hsudc, 0); | |
1116 | s3c_hsudc_handle_ep0_intr(hsudc); | |
1117 | } | |
1118 | ||
1119 | ep_intr >>= 1; | |
1120 | ep_idx = 1; | |
1121 | while (ep_intr) { | |
1122 | if (ep_intr & 1) { | |
1123 | hsep = &hsudc->ep[ep_idx]; | |
1124 | set_index(hsudc, ep_idx); | |
1125 | writel(1 << ep_idx, hsudc->regs + S3C_EIR); | |
1126 | if (ep_is_in(hsep)) | |
1127 | s3c_hsudc_epin_intr(hsudc, ep_idx); | |
1128 | else | |
1129 | s3c_hsudc_epout_intr(hsudc, ep_idx); | |
1130 | } | |
1131 | ep_intr >>= 1; | |
1132 | ep_idx++; | |
1133 | } | |
1134 | ||
1135 | spin_unlock(&hsudc->lock); | |
1136 | return IRQ_HANDLED; | |
1137 | } | |
1138 | ||
1139 | static int s3c_hsudc_start(struct usb_gadget *gadget, | |
1140 | struct usb_gadget_driver *driver) | |
1141 | { | |
1142 | struct s3c_hsudc *hsudc = to_hsudc(gadget); | |
1143 | int ret; | |
1144 | ||
1145 | if (!driver | |
1146 | || driver->max_speed < USB_SPEED_FULL | |
1147 | || !driver->setup) | |
1148 | return -EINVAL; | |
1149 | ||
1150 | if (!hsudc) | |
1151 | return -ENODEV; | |
1152 | ||
1153 | if (hsudc->driver) | |
1154 | return -EBUSY; | |
1155 | ||
1156 | hsudc->driver = driver; | |
1157 | hsudc->gadget.dev.driver = &driver->driver; | |
1158 | ||
1159 | ret = regulator_bulk_enable(ARRAY_SIZE(hsudc->supplies), | |
1160 | hsudc->supplies); | |
1161 | if (ret != 0) { | |
1162 | dev_err(hsudc->dev, "failed to enable supplies: %d\n", ret); | |
1163 | goto err_supplies; | |
1164 | } | |
1165 | ||
1166 | /* connect to bus through transceiver */ | |
1167 | if (!IS_ERR_OR_NULL(hsudc->transceiver)) { | |
1168 | ret = otg_set_peripheral(hsudc->transceiver->otg, | |
1169 | &hsudc->gadget); | |
1170 | if (ret) { | |
1171 | dev_err(hsudc->dev, "%s: can't bind to transceiver\n", | |
1172 | hsudc->gadget.name); | |
1173 | goto err_otg; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | enable_irq(hsudc->irq); | |
1178 | dev_info(hsudc->dev, "bound driver %s\n", driver->driver.name); | |
1179 | ||
1180 | s3c_hsudc_reconfig(hsudc); | |
1181 | ||
1182 | pm_runtime_get_sync(hsudc->dev); | |
1183 | ||
1184 | s3c_hsudc_init_phy(); | |
1185 | if (hsudc->pd->gpio_init) | |
1186 | hsudc->pd->gpio_init(); | |
1187 | ||
1188 | return 0; | |
1189 | err_otg: | |
1190 | regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies); | |
1191 | err_supplies: | |
1192 | hsudc->driver = NULL; | |
1193 | hsudc->gadget.dev.driver = NULL; | |
1194 | return ret; | |
1195 | } | |
1196 | ||
1197 | static int s3c_hsudc_stop(struct usb_gadget *gadget, | |
1198 | struct usb_gadget_driver *driver) | |
1199 | { | |
1200 | struct s3c_hsudc *hsudc = to_hsudc(gadget); | |
1201 | unsigned long flags; | |
1202 | ||
1203 | if (!hsudc) | |
1204 | return -ENODEV; | |
1205 | ||
1206 | if (!driver || driver != hsudc->driver) | |
1207 | return -EINVAL; | |
1208 | ||
1209 | spin_lock_irqsave(&hsudc->lock, flags); | |
1210 | hsudc->driver = NULL; | |
1211 | hsudc->gadget.dev.driver = NULL; | |
1212 | hsudc->gadget.speed = USB_SPEED_UNKNOWN; | |
1213 | s3c_hsudc_uninit_phy(); | |
1214 | ||
1215 | pm_runtime_put(hsudc->dev); | |
1216 | ||
1217 | if (hsudc->pd->gpio_uninit) | |
1218 | hsudc->pd->gpio_uninit(); | |
1219 | s3c_hsudc_stop_activity(hsudc); | |
1220 | spin_unlock_irqrestore(&hsudc->lock, flags); | |
1221 | ||
1222 | if (!IS_ERR_OR_NULL(hsudc->transceiver)) | |
1223 | (void) otg_set_peripheral(hsudc->transceiver->otg, NULL); | |
1224 | ||
1225 | disable_irq(hsudc->irq); | |
1226 | ||
1227 | regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies); | |
1228 | ||
1229 | dev_info(hsudc->dev, "unregistered gadget driver '%s'\n", | |
1230 | driver->driver.name); | |
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | static inline u32 s3c_hsudc_read_frameno(struct s3c_hsudc *hsudc) | |
1235 | { | |
1236 | return readl(hsudc->regs + S3C_FNR) & 0x3FF; | |
1237 | } | |
1238 | ||
1239 | static int s3c_hsudc_gadget_getframe(struct usb_gadget *gadget) | |
1240 | { | |
1241 | return s3c_hsudc_read_frameno(to_hsudc(gadget)); | |
1242 | } | |
1243 | ||
1244 | static int s3c_hsudc_vbus_draw(struct usb_gadget *gadget, unsigned mA) | |
1245 | { | |
1246 | struct s3c_hsudc *hsudc = to_hsudc(gadget); | |
1247 | ||
1248 | if (!hsudc) | |
1249 | return -ENODEV; | |
1250 | ||
1251 | if (!IS_ERR_OR_NULL(hsudc->transceiver)) | |
1252 | return usb_phy_set_power(hsudc->transceiver, mA); | |
1253 | ||
1254 | return -EOPNOTSUPP; | |
1255 | } | |
1256 | ||
1257 | static struct usb_gadget_ops s3c_hsudc_gadget_ops = { | |
1258 | .get_frame = s3c_hsudc_gadget_getframe, | |
1259 | .udc_start = s3c_hsudc_start, | |
1260 | .udc_stop = s3c_hsudc_stop, | |
1261 | .vbus_draw = s3c_hsudc_vbus_draw, | |
1262 | }; | |
1263 | ||
1264 | static int s3c_hsudc_probe(struct platform_device *pdev) | |
1265 | { | |
1266 | struct device *dev = &pdev->dev; | |
1267 | struct resource *res; | |
1268 | struct s3c_hsudc *hsudc; | |
1269 | struct s3c24xx_hsudc_platdata *pd = pdev->dev.platform_data; | |
1270 | int ret, i; | |
1271 | ||
1272 | hsudc = devm_kzalloc(&pdev->dev, sizeof(struct s3c_hsudc) + | |
1273 | sizeof(struct s3c_hsudc_ep) * pd->epnum, | |
1274 | GFP_KERNEL); | |
1275 | if (!hsudc) { | |
1276 | dev_err(dev, "cannot allocate memory\n"); | |
1277 | return -ENOMEM; | |
1278 | } | |
1279 | ||
1280 | platform_set_drvdata(pdev, dev); | |
1281 | hsudc->dev = dev; | |
1282 | hsudc->pd = pdev->dev.platform_data; | |
1283 | ||
1284 | hsudc->transceiver = usb_get_phy(USB_PHY_TYPE_USB2); | |
1285 | ||
1286 | for (i = 0; i < ARRAY_SIZE(hsudc->supplies); i++) | |
1287 | hsudc->supplies[i].supply = s3c_hsudc_supply_names[i]; | |
1288 | ||
1289 | ret = regulator_bulk_get(dev, ARRAY_SIZE(hsudc->supplies), | |
1290 | hsudc->supplies); | |
1291 | if (ret != 0) { | |
1292 | dev_err(dev, "failed to request supplies: %d\n", ret); | |
1293 | goto err_supplies; | |
1294 | } | |
1295 | ||
1296 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1297 | ||
1298 | hsudc->regs = devm_request_and_ioremap(&pdev->dev, res); | |
1299 | if (!hsudc->regs) { | |
1300 | dev_err(dev, "error mapping device register area\n"); | |
1301 | ret = -EBUSY; | |
1302 | goto err_res; | |
1303 | } | |
1304 | ||
1305 | spin_lock_init(&hsudc->lock); | |
1306 | ||
1307 | dev_set_name(&hsudc->gadget.dev, "gadget"); | |
1308 | ||
1309 | hsudc->gadget.max_speed = USB_SPEED_HIGH; | |
1310 | hsudc->gadget.ops = &s3c_hsudc_gadget_ops; | |
1311 | hsudc->gadget.name = dev_name(dev); | |
1312 | hsudc->gadget.dev.parent = dev; | |
1313 | hsudc->gadget.dev.dma_mask = dev->dma_mask; | |
1314 | hsudc->gadget.ep0 = &hsudc->ep[0].ep; | |
1315 | ||
1316 | hsudc->gadget.is_otg = 0; | |
1317 | hsudc->gadget.is_a_peripheral = 0; | |
1318 | hsudc->gadget.speed = USB_SPEED_UNKNOWN; | |
1319 | ||
1320 | s3c_hsudc_setup_ep(hsudc); | |
1321 | ||
1322 | ret = platform_get_irq(pdev, 0); | |
1323 | if (ret < 0) { | |
1324 | dev_err(dev, "unable to obtain IRQ number\n"); | |
1325 | goto err_res; | |
1326 | } | |
1327 | hsudc->irq = ret; | |
1328 | ||
1329 | ret = devm_request_irq(&pdev->dev, hsudc->irq, s3c_hsudc_irq, 0, | |
1330 | driver_name, hsudc); | |
1331 | if (ret < 0) { | |
1332 | dev_err(dev, "irq request failed\n"); | |
1333 | goto err_res; | |
1334 | } | |
1335 | ||
1336 | hsudc->uclk = devm_clk_get(&pdev->dev, "usb-device"); | |
1337 | if (IS_ERR(hsudc->uclk)) { | |
1338 | dev_err(dev, "failed to find usb-device clock source\n"); | |
1339 | ret = PTR_ERR(hsudc->uclk); | |
1340 | goto err_res; | |
1341 | } | |
1342 | clk_enable(hsudc->uclk); | |
1343 | ||
1344 | local_irq_disable(); | |
1345 | ||
1346 | disable_irq(hsudc->irq); | |
1347 | local_irq_enable(); | |
1348 | ||
1349 | ret = device_register(&hsudc->gadget.dev); | |
1350 | if (ret) { | |
1351 | put_device(&hsudc->gadget.dev); | |
1352 | goto err_add_device; | |
1353 | } | |
1354 | ||
1355 | ret = usb_add_gadget_udc(&pdev->dev, &hsudc->gadget); | |
1356 | if (ret) | |
1357 | goto err_add_udc; | |
1358 | ||
1359 | pm_runtime_enable(dev); | |
1360 | ||
1361 | return 0; | |
1362 | err_add_udc: | |
1363 | device_unregister(&hsudc->gadget.dev); | |
1364 | err_add_device: | |
1365 | clk_disable(hsudc->uclk); | |
1366 | err_res: | |
1367 | if (!IS_ERR_OR_NULL(hsudc->transceiver)) | |
1368 | usb_put_phy(hsudc->transceiver); | |
1369 | ||
1370 | regulator_bulk_free(ARRAY_SIZE(hsudc->supplies), hsudc->supplies); | |
1371 | err_supplies: | |
1372 | return ret; | |
1373 | } | |
1374 | ||
1375 | static struct platform_driver s3c_hsudc_driver = { | |
1376 | .driver = { | |
1377 | .owner = THIS_MODULE, | |
1378 | .name = "s3c-hsudc", | |
1379 | }, | |
1380 | .probe = s3c_hsudc_probe, | |
1381 | }; | |
1382 | ||
1383 | module_platform_driver(s3c_hsudc_driver); | |
1384 | ||
1385 | MODULE_DESCRIPTION("Samsung S3C24XX USB high-speed controller driver"); | |
1386 | MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>"); | |
1387 | MODULE_LICENSE("GPL"); | |
1388 | MODULE_ALIAS("platform:s3c-hsudc"); |