David Brownell | bae4bd8 | 2006-01-22 10:32:37 -0800 | [diff] [blame] | 1 | /* |
| 2 | * at91_udc -- driver for at91-series USB peripheral controller |
| 3 | * |
| 4 | * Copyright (C) 2004 by Thomas Rathbone |
| 5 | * Copyright (C) 2005 by HP Labs |
| 6 | * Copyright (C) 2005 by David Brownell |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the |
| 20 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | * Boston, MA 02111-1307, USA. |
| 22 | */ |
| 23 | |
| 24 | #undef DEBUG |
| 25 | #undef VERBOSE |
| 26 | #undef PACKET_TRACE |
| 27 | |
| 28 | #include <linux/config.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/platform_device.h> |
| 32 | #include <linux/delay.h> |
| 33 | #include <linux/ioport.h> |
| 34 | #include <linux/sched.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/smp_lock.h> |
| 37 | #include <linux/errno.h> |
| 38 | #include <linux/init.h> |
| 39 | #include <linux/list.h> |
| 40 | #include <linux/interrupt.h> |
| 41 | #include <linux/proc_fs.h> |
| 42 | #include <linux/clk.h> |
| 43 | #include <linux/usb_ch9.h> |
| 44 | #include <linux/usb_gadget.h> |
| 45 | |
| 46 | #include <asm/byteorder.h> |
| 47 | #include <asm/io.h> |
| 48 | #include <asm/irq.h> |
| 49 | #include <asm/system.h> |
| 50 | #include <asm/mach-types.h> |
| 51 | |
| 52 | #include <asm/arch/hardware.h> |
| 53 | #include <asm/arch/gpio.h> |
| 54 | #include <asm/arch/board.h> |
| 55 | |
| 56 | #include "at91_udc.h" |
| 57 | |
| 58 | |
| 59 | /* |
| 60 | * This controller is simple and PIO-only. It's used in many AT91-series |
| 61 | * ARMv4T controllers, including the at91rm9200 (arm920T, with MMU), |
| 62 | * at91sam9261 (arm926ejs, with MMU), and several no-mmu versions. |
| 63 | * |
| 64 | * This driver expects the board has been wired with two GPIOs suppporting |
| 65 | * a VBUS sensing IRQ, and a D+ pullup. (They may be omitted, but the |
| 66 | * testing hasn't covered such cases.) The pullup is most important; it |
| 67 | * provides software control over whether the host enumerates the device. |
| 68 | * The VBUS sensing helps during enumeration, and allows both USB clocks |
| 69 | * (and the transceiver) to stay gated off until they're necessary, saving |
| 70 | * power. During USB suspend, the 48 MHz clock is gated off. |
| 71 | */ |
| 72 | |
| 73 | #define DRIVER_VERSION "8 March 2005" |
| 74 | |
| 75 | static const char driver_name [] = "at91_udc"; |
| 76 | static const char ep0name[] = "ep0"; |
| 77 | |
| 78 | /*-------------------------------------------------------------------------*/ |
| 79 | |
| 80 | /* |
| 81 | * Read from a UDP register. |
| 82 | */ |
| 83 | static inline unsigned long at91_udp_read(unsigned int reg) |
| 84 | { |
| 85 | void __iomem *udp_base = (void __iomem *)AT91_VA_BASE_UDP; |
| 86 | |
| 87 | return __raw_readl(udp_base + reg); |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Write to a UDP register. |
| 92 | */ |
| 93 | static inline void at91_udp_write(unsigned int reg, unsigned long value) |
| 94 | { |
| 95 | void __iomem *udp_base = (void __iomem *)AT91_VA_BASE_UDP; |
| 96 | |
| 97 | __raw_writel(value, udp_base + reg); |
| 98 | } |
| 99 | |
| 100 | /*-------------------------------------------------------------------------*/ |
| 101 | |
| 102 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES |
| 103 | |
| 104 | #include <linux/seq_file.h> |
| 105 | |
| 106 | static const char debug_filename[] = "driver/udc"; |
| 107 | |
| 108 | #define FOURBITS "%s%s%s%s" |
| 109 | #define EIGHTBITS FOURBITS FOURBITS |
| 110 | |
| 111 | static void proc_ep_show(struct seq_file *s, struct at91_ep *ep) |
| 112 | { |
| 113 | static char *types[] = { |
| 114 | "control", "out-iso", "out-bulk", "out-int", |
| 115 | "BOGUS", "in-iso", "in-bulk", "in-int"}; |
| 116 | |
| 117 | u32 csr; |
| 118 | struct at91_request *req; |
| 119 | unsigned long flags; |
| 120 | |
| 121 | local_irq_save(flags); |
| 122 | |
| 123 | csr = __raw_readl(ep->creg); |
| 124 | |
| 125 | /* NOTE: not collecting per-endpoint irq statistics... */ |
| 126 | |
| 127 | seq_printf(s, "\n"); |
| 128 | seq_printf(s, "%s, maxpacket %d %s%s %s%s\n", |
| 129 | ep->ep.name, ep->ep.maxpacket, |
| 130 | ep->is_in ? "in" : "out", |
| 131 | ep->is_iso ? " iso" : "", |
| 132 | ep->is_pingpong |
| 133 | ? (ep->fifo_bank ? "pong" : "ping") |
| 134 | : "", |
| 135 | ep->stopped ? " stopped" : ""); |
| 136 | seq_printf(s, "csr %08x rxbytes=%d %s %s %s" EIGHTBITS "\n", |
| 137 | csr, |
| 138 | (csr & 0x07ff0000) >> 16, |
| 139 | (csr & (1 << 15)) ? "enabled" : "disabled", |
| 140 | (csr & (1 << 11)) ? "DATA1" : "DATA0", |
| 141 | types[(csr & 0x700) >> 8], |
| 142 | |
| 143 | /* iff type is control then print current direction */ |
| 144 | (!(csr & 0x700)) |
| 145 | ? ((csr & (1 << 7)) ? " IN" : " OUT") |
| 146 | : "", |
| 147 | (csr & (1 << 6)) ? " rxdatabk1" : "", |
| 148 | (csr & (1 << 5)) ? " forcestall" : "", |
| 149 | (csr & (1 << 4)) ? " txpktrdy" : "", |
| 150 | |
| 151 | (csr & (1 << 3)) ? " stallsent" : "", |
| 152 | (csr & (1 << 2)) ? " rxsetup" : "", |
| 153 | (csr & (1 << 1)) ? " rxdatabk0" : "", |
| 154 | (csr & (1 << 0)) ? " txcomp" : ""); |
| 155 | if (list_empty (&ep->queue)) |
| 156 | seq_printf(s, "\t(queue empty)\n"); |
| 157 | |
| 158 | else list_for_each_entry (req, &ep->queue, queue) { |
| 159 | unsigned length = req->req.actual; |
| 160 | |
| 161 | seq_printf(s, "\treq %p len %d/%d buf %p\n", |
| 162 | &req->req, length, |
| 163 | req->req.length, req->req.buf); |
| 164 | } |
| 165 | local_irq_restore(flags); |
| 166 | } |
| 167 | |
| 168 | static void proc_irq_show(struct seq_file *s, const char *label, u32 mask) |
| 169 | { |
| 170 | int i; |
| 171 | |
| 172 | seq_printf(s, "%s %04x:%s%s" FOURBITS, label, mask, |
| 173 | (mask & (1 << 13)) ? " wakeup" : "", |
| 174 | (mask & (1 << 12)) ? " endbusres" : "", |
| 175 | |
| 176 | (mask & (1 << 11)) ? " sofint" : "", |
| 177 | (mask & (1 << 10)) ? " extrsm" : "", |
| 178 | (mask & (1 << 9)) ? " rxrsm" : "", |
| 179 | (mask & (1 << 8)) ? " rxsusp" : ""); |
| 180 | for (i = 0; i < 8; i++) { |
| 181 | if (mask & (1 << i)) |
| 182 | seq_printf(s, " ep%d", i); |
| 183 | } |
| 184 | seq_printf(s, "\n"); |
| 185 | } |
| 186 | |
| 187 | static int proc_udc_show(struct seq_file *s, void *unused) |
| 188 | { |
| 189 | struct at91_udc *udc = s->private; |
| 190 | struct at91_ep *ep; |
| 191 | u32 tmp; |
| 192 | |
| 193 | seq_printf(s, "%s: version %s\n", driver_name, DRIVER_VERSION); |
| 194 | |
| 195 | seq_printf(s, "vbus %s, pullup %s, %s powered%s, gadget %s\n\n", |
| 196 | udc->vbus ? "present" : "off", |
| 197 | udc->enabled |
| 198 | ? (udc->vbus ? "active" : "enabled") |
| 199 | : "disabled", |
| 200 | udc->selfpowered ? "self" : "VBUS", |
| 201 | udc->suspended ? ", suspended" : "", |
| 202 | udc->driver ? udc->driver->driver.name : "(none)"); |
| 203 | |
| 204 | /* don't access registers when interface isn't clocked */ |
| 205 | if (!udc->clocked) { |
| 206 | seq_printf(s, "(not clocked)\n"); |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | tmp = at91_udp_read(AT91_UDP_FRM_NUM); |
| 211 | seq_printf(s, "frame %05x:%s%s frame=%d\n", tmp, |
| 212 | (tmp & AT91_UDP_FRM_OK) ? " ok" : "", |
| 213 | (tmp & AT91_UDP_FRM_ERR) ? " err" : "", |
| 214 | (tmp & AT91_UDP_NUM)); |
| 215 | |
| 216 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); |
| 217 | seq_printf(s, "glbstate %02x:%s" FOURBITS "\n", tmp, |
| 218 | (tmp & AT91_UDP_RMWUPE) ? " rmwupe" : "", |
| 219 | (tmp & AT91_UDP_RSMINPR) ? " rsminpr" : "", |
| 220 | (tmp & AT91_UDP_ESR) ? " esr" : "", |
| 221 | (tmp & AT91_UDP_CONFG) ? " confg" : "", |
| 222 | (tmp & AT91_UDP_FADDEN) ? " fadden" : ""); |
| 223 | |
| 224 | tmp = at91_udp_read(AT91_UDP_FADDR); |
| 225 | seq_printf(s, "faddr %03x:%s fadd=%d\n", tmp, |
| 226 | (tmp & AT91_UDP_FEN) ? " fen" : "", |
| 227 | (tmp & AT91_UDP_FADD)); |
| 228 | |
| 229 | proc_irq_show(s, "imr ", at91_udp_read(AT91_UDP_IMR)); |
| 230 | proc_irq_show(s, "isr ", at91_udp_read(AT91_UDP_ISR)); |
| 231 | |
| 232 | if (udc->enabled && udc->vbus) { |
| 233 | proc_ep_show(s, &udc->ep[0]); |
| 234 | list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) { |
| 235 | if (ep->desc) |
| 236 | proc_ep_show(s, ep); |
| 237 | } |
| 238 | } |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static int proc_udc_open(struct inode *inode, struct file *file) |
| 243 | { |
| 244 | return single_open(file, proc_udc_show, PDE(inode)->data); |
| 245 | } |
| 246 | |
| 247 | static struct file_operations proc_ops = { |
| 248 | .open = proc_udc_open, |
| 249 | .read = seq_read, |
| 250 | .llseek = seq_lseek, |
| 251 | .release = single_release, |
| 252 | }; |
| 253 | |
| 254 | static void create_debug_file(struct at91_udc *udc) |
| 255 | { |
| 256 | struct proc_dir_entry *pde; |
| 257 | |
| 258 | pde = create_proc_entry (debug_filename, 0, NULL); |
| 259 | udc->pde = pde; |
| 260 | if (pde == NULL) |
| 261 | return; |
| 262 | |
| 263 | pde->proc_fops = &proc_ops; |
| 264 | pde->data = udc; |
| 265 | } |
| 266 | |
| 267 | static void remove_debug_file(struct at91_udc *udc) |
| 268 | { |
| 269 | if (udc->pde) |
| 270 | remove_proc_entry(debug_filename, NULL); |
| 271 | } |
| 272 | |
| 273 | #else |
| 274 | |
| 275 | static inline void create_debug_file(struct at91_udc *udc) {} |
| 276 | static inline void remove_debug_file(struct at91_udc *udc) {} |
| 277 | |
| 278 | #endif |
| 279 | |
| 280 | |
| 281 | /*-------------------------------------------------------------------------*/ |
| 282 | |
| 283 | static void done(struct at91_ep *ep, struct at91_request *req, int status) |
| 284 | { |
| 285 | unsigned stopped = ep->stopped; |
| 286 | |
| 287 | list_del_init(&req->queue); |
| 288 | if (req->req.status == -EINPROGRESS) |
| 289 | req->req.status = status; |
| 290 | else |
| 291 | status = req->req.status; |
| 292 | if (status && status != -ESHUTDOWN) |
| 293 | VDBG("%s done %p, status %d\n", ep->ep.name, req, status); |
| 294 | |
| 295 | ep->stopped = 1; |
| 296 | req->req.complete(&ep->ep, &req->req); |
| 297 | ep->stopped = stopped; |
| 298 | |
| 299 | /* ep0 is always ready; other endpoints need a non-empty queue */ |
| 300 | if (list_empty(&ep->queue) && ep->int_mask != (1 << 0)) |
| 301 | at91_udp_write(AT91_UDP_IDR, ep->int_mask); |
| 302 | } |
| 303 | |
| 304 | /*-------------------------------------------------------------------------*/ |
| 305 | |
| 306 | /* bits indicating OUT fifo has data ready */ |
| 307 | #define RX_DATA_READY (AT91_UDP_RX_DATA_BK0 | AT91_UDP_RX_DATA_BK1) |
| 308 | |
| 309 | /* |
| 310 | * Endpoint FIFO CSR bits have a mix of bits, making it unsafe to just write |
| 311 | * back most of the value you just read (because of side effects, including |
| 312 | * bits that may change after reading and before writing). |
| 313 | * |
| 314 | * Except when changing a specific bit, always write values which: |
| 315 | * - clear SET_FX bits (setting them could change something) |
| 316 | * - set CLR_FX bits (clearing them could change something) |
| 317 | * |
| 318 | * There are also state bits like FORCESTALL, EPEDS, DIR, and EPTYPE |
| 319 | * that shouldn't normally be changed. |
| 320 | */ |
| 321 | #define SET_FX (AT91_UDP_TXPKTRDY) |
| 322 | #define CLR_FX (RX_DATA_READY | AT91_UDP_RXSETUP | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP) |
| 323 | |
| 324 | /* pull OUT packet data from the endpoint's fifo */ |
| 325 | static int read_fifo (struct at91_ep *ep, struct at91_request *req) |
| 326 | { |
| 327 | u32 __iomem *creg = ep->creg; |
| 328 | u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); |
| 329 | u32 csr; |
| 330 | u8 *buf; |
| 331 | unsigned int count, bufferspace, is_done; |
| 332 | |
| 333 | buf = req->req.buf + req->req.actual; |
| 334 | bufferspace = req->req.length - req->req.actual; |
| 335 | |
| 336 | /* |
| 337 | * there might be nothing to read if ep_queue() calls us, |
| 338 | * or if we already emptied both pingpong buffers |
| 339 | */ |
| 340 | rescan: |
| 341 | csr = __raw_readl(creg); |
| 342 | if ((csr & RX_DATA_READY) == 0) |
| 343 | return 0; |
| 344 | |
| 345 | count = (csr & AT91_UDP_RXBYTECNT) >> 16; |
| 346 | if (count > ep->ep.maxpacket) |
| 347 | count = ep->ep.maxpacket; |
| 348 | if (count > bufferspace) { |
| 349 | DBG("%s buffer overflow\n", ep->ep.name); |
| 350 | req->req.status = -EOVERFLOW; |
| 351 | count = bufferspace; |
| 352 | } |
| 353 | __raw_readsb(dreg, buf, count); |
| 354 | |
| 355 | /* release and swap pingpong mem bank */ |
| 356 | csr |= CLR_FX; |
| 357 | if (ep->is_pingpong) { |
| 358 | if (ep->fifo_bank == 0) { |
| 359 | csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); |
| 360 | ep->fifo_bank = 1; |
| 361 | } else { |
| 362 | csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK1); |
| 363 | ep->fifo_bank = 0; |
| 364 | } |
| 365 | } else |
| 366 | csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); |
| 367 | __raw_writel(csr, creg); |
| 368 | |
| 369 | req->req.actual += count; |
| 370 | is_done = (count < ep->ep.maxpacket); |
| 371 | if (count == bufferspace) |
| 372 | is_done = 1; |
| 373 | |
| 374 | PACKET("%s %p out/%d%s\n", ep->ep.name, &req->req, count, |
| 375 | is_done ? " (done)" : ""); |
| 376 | |
| 377 | /* |
| 378 | * avoid extra trips through IRQ logic for packets already in |
| 379 | * the fifo ... maybe preventing an extra (expensive) OUT-NAK |
| 380 | */ |
| 381 | if (is_done) |
| 382 | done(ep, req, 0); |
| 383 | else if (ep->is_pingpong) { |
| 384 | bufferspace -= count; |
| 385 | buf += count; |
| 386 | goto rescan; |
| 387 | } |
| 388 | |
| 389 | return is_done; |
| 390 | } |
| 391 | |
| 392 | /* load fifo for an IN packet */ |
| 393 | static int write_fifo(struct at91_ep *ep, struct at91_request *req) |
| 394 | { |
| 395 | u32 __iomem *creg = ep->creg; |
| 396 | u32 csr = __raw_readl(creg); |
| 397 | u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); |
| 398 | unsigned total, count, is_last; |
| 399 | |
| 400 | /* |
| 401 | * TODO: allow for writing two packets to the fifo ... that'll |
| 402 | * reduce the amount of IN-NAKing, but probably won't affect |
| 403 | * throughput much. (Unlike preventing OUT-NAKing!) |
| 404 | */ |
| 405 | |
| 406 | /* |
| 407 | * If ep_queue() calls us, the queue is empty and possibly in |
| 408 | * odd states like TXCOMP not yet cleared (we do it, saving at |
| 409 | * least one IRQ) or the fifo not yet being free. Those aren't |
| 410 | * issues normally (IRQ handler fast path). |
| 411 | */ |
| 412 | if (unlikely(csr & (AT91_UDP_TXCOMP | AT91_UDP_TXPKTRDY))) { |
| 413 | if (csr & AT91_UDP_TXCOMP) { |
| 414 | csr |= CLR_FX; |
| 415 | csr &= ~(SET_FX | AT91_UDP_TXCOMP); |
| 416 | __raw_writel(csr, creg); |
| 417 | csr = __raw_readl(creg); |
| 418 | } |
| 419 | if (csr & AT91_UDP_TXPKTRDY) |
| 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | total = req->req.length - req->req.actual; |
| 424 | if (ep->ep.maxpacket < total) { |
| 425 | count = ep->ep.maxpacket; |
| 426 | is_last = 0; |
| 427 | } else { |
| 428 | count = total; |
| 429 | is_last = (count < ep->ep.maxpacket) || !req->req.zero; |
| 430 | } |
| 431 | |
| 432 | /* |
| 433 | * Write the packet, maybe it's a ZLP. |
| 434 | * |
| 435 | * NOTE: incrementing req->actual before we receive the ACK means |
| 436 | * gadget driver IN bytecounts can be wrong in fault cases. That's |
| 437 | * fixable with PIO drivers like this one (save "count" here, and |
| 438 | * do the increment later on TX irq), but not for most DMA hardware. |
| 439 | * |
| 440 | * So all gadget drivers must accept that potential error. Some |
| 441 | * hardware supports precise fifo status reporting, letting them |
| 442 | * recover when the actual bytecount matters (e.g. for USB Test |
| 443 | * and Measurement Class devices). |
| 444 | */ |
| 445 | __raw_writesb(dreg, req->req.buf + req->req.actual, count); |
| 446 | csr &= ~SET_FX; |
| 447 | csr |= CLR_FX | AT91_UDP_TXPKTRDY; |
| 448 | __raw_writel(csr, creg); |
| 449 | req->req.actual += count; |
| 450 | |
| 451 | PACKET("%s %p in/%d%s\n", ep->ep.name, &req->req, count, |
| 452 | is_last ? " (done)" : ""); |
| 453 | if (is_last) |
| 454 | done(ep, req, 0); |
| 455 | return is_last; |
| 456 | } |
| 457 | |
| 458 | static void nuke(struct at91_ep *ep, int status) |
| 459 | { |
| 460 | struct at91_request *req; |
| 461 | |
| 462 | // terminer chaque requete dans la queue |
| 463 | ep->stopped = 1; |
| 464 | if (list_empty(&ep->queue)) |
| 465 | return; |
| 466 | |
| 467 | VDBG("%s %s\n", __FUNCTION__, ep->ep.name); |
| 468 | while (!list_empty(&ep->queue)) { |
| 469 | req = list_entry(ep->queue.next, struct at91_request, queue); |
| 470 | done(ep, req, status); |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | /*-------------------------------------------------------------------------*/ |
| 475 | |
| 476 | static int at91_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) |
| 477 | { |
| 478 | struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); |
| 479 | struct at91_udc *dev = ep->udc; |
| 480 | u16 maxpacket; |
| 481 | u32 tmp; |
| 482 | unsigned long flags; |
| 483 | |
| 484 | if (!_ep || !ep |
| 485 | || !desc || ep->desc |
| 486 | || _ep->name == ep0name |
| 487 | || desc->bDescriptorType != USB_DT_ENDPOINT |
| 488 | || (maxpacket = le16_to_cpu(desc->wMaxPacketSize)) == 0 |
| 489 | || maxpacket > ep->maxpacket) { |
| 490 | DBG("bad ep or descriptor\n"); |
| 491 | return -EINVAL; |
| 492 | } |
| 493 | |
| 494 | if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { |
| 495 | DBG("bogus device state\n"); |
| 496 | return -ESHUTDOWN; |
| 497 | } |
| 498 | |
| 499 | tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; |
| 500 | switch (tmp) { |
| 501 | case USB_ENDPOINT_XFER_CONTROL: |
| 502 | DBG("only one control endpoint\n"); |
| 503 | return -EINVAL; |
| 504 | case USB_ENDPOINT_XFER_INT: |
| 505 | if (maxpacket > 64) |
| 506 | goto bogus_max; |
| 507 | break; |
| 508 | case USB_ENDPOINT_XFER_BULK: |
| 509 | switch (maxpacket) { |
| 510 | case 8: |
| 511 | case 16: |
| 512 | case 32: |
| 513 | case 64: |
| 514 | goto ok; |
| 515 | } |
| 516 | bogus_max: |
| 517 | DBG("bogus maxpacket %d\n", maxpacket); |
| 518 | return -EINVAL; |
| 519 | case USB_ENDPOINT_XFER_ISOC: |
| 520 | if (!ep->is_pingpong) { |
| 521 | DBG("iso requires double buffering\n"); |
| 522 | return -EINVAL; |
| 523 | } |
| 524 | break; |
| 525 | } |
| 526 | |
| 527 | ok: |
| 528 | local_irq_save(flags); |
| 529 | |
| 530 | /* initialize endpoint to match this descriptor */ |
| 531 | ep->is_in = (desc->bEndpointAddress & USB_DIR_IN) != 0; |
| 532 | ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC); |
| 533 | ep->stopped = 0; |
| 534 | if (ep->is_in) |
| 535 | tmp |= 0x04; |
| 536 | tmp <<= 8; |
| 537 | tmp |= AT91_UDP_EPEDS; |
| 538 | __raw_writel(tmp, ep->creg); |
| 539 | |
| 540 | ep->desc = desc; |
| 541 | ep->ep.maxpacket = maxpacket; |
| 542 | |
| 543 | /* |
| 544 | * reset/init endpoint fifo. NOTE: leaves fifo_bank alone, |
| 545 | * since endpoint resets don't reset hw pingpong state. |
| 546 | */ |
| 547 | at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); |
| 548 | at91_udp_write(AT91_UDP_RST_EP, 0); |
| 549 | |
| 550 | local_irq_restore(flags); |
| 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | static int at91_ep_disable (struct usb_ep * _ep) |
| 555 | { |
| 556 | struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); |
| 557 | unsigned long flags; |
| 558 | |
| 559 | if (ep == &ep->udc->ep[0]) |
| 560 | return -EINVAL; |
| 561 | |
| 562 | local_irq_save(flags); |
| 563 | |
| 564 | nuke(ep, -ESHUTDOWN); |
| 565 | |
| 566 | /* restore the endpoint's pristine config */ |
| 567 | ep->desc = NULL; |
| 568 | ep->ep.maxpacket = ep->maxpacket; |
| 569 | |
| 570 | /* reset fifos and endpoint */ |
| 571 | if (ep->udc->clocked) { |
| 572 | at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); |
| 573 | at91_udp_write(AT91_UDP_RST_EP, 0); |
| 574 | __raw_writel(0, ep->creg); |
| 575 | } |
| 576 | |
| 577 | local_irq_restore(flags); |
| 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * this is a PIO-only driver, so there's nothing |
| 583 | * interesting for request or buffer allocation. |
| 584 | */ |
| 585 | |
| 586 | static struct usb_request *at91_ep_alloc_request (struct usb_ep *_ep, unsigned int gfp_flags) |
| 587 | { |
| 588 | struct at91_request *req; |
| 589 | |
| 590 | req = kcalloc(1, sizeof (struct at91_request), SLAB_KERNEL); |
| 591 | if (!req) |
| 592 | return NULL; |
| 593 | |
| 594 | INIT_LIST_HEAD(&req->queue); |
| 595 | return &req->req; |
| 596 | } |
| 597 | |
| 598 | static void at91_ep_free_request(struct usb_ep *_ep, struct usb_request *_req) |
| 599 | { |
| 600 | struct at91_request *req; |
| 601 | |
| 602 | req = container_of(_req, struct at91_request, req); |
| 603 | BUG_ON(!list_empty(&req->queue)); |
| 604 | kfree(req); |
| 605 | } |
| 606 | |
| 607 | static void *at91_ep_alloc_buffer( |
| 608 | struct usb_ep *_ep, |
| 609 | unsigned bytes, |
| 610 | dma_addr_t *dma, |
| 611 | gfp_t gfp_flags) |
| 612 | { |
| 613 | *dma = ~0; |
| 614 | return kmalloc(bytes, gfp_flags); |
| 615 | } |
| 616 | |
| 617 | static void at91_ep_free_buffer( |
| 618 | struct usb_ep *ep, |
| 619 | void *buf, |
| 620 | dma_addr_t dma, |
| 621 | unsigned bytes) |
| 622 | { |
| 623 | kfree(buf); |
| 624 | } |
| 625 | |
| 626 | static int at91_ep_queue(struct usb_ep *_ep, |
| 627 | struct usb_request *_req, gfp_t gfp_flags) |
| 628 | { |
| 629 | struct at91_request *req; |
| 630 | struct at91_ep *ep; |
| 631 | struct at91_udc *dev; |
| 632 | int status; |
| 633 | unsigned long flags; |
| 634 | |
| 635 | req = container_of(_req, struct at91_request, req); |
| 636 | ep = container_of(_ep, struct at91_ep, ep); |
| 637 | |
| 638 | if (!_req || !_req->complete |
| 639 | || !_req->buf || !list_empty(&req->queue)) { |
| 640 | DBG("invalid request\n"); |
| 641 | return -EINVAL; |
| 642 | } |
| 643 | |
| 644 | if (!_ep || (!ep->desc && ep->ep.name != ep0name)) { |
| 645 | DBG("invalid ep\n"); |
| 646 | return -EINVAL; |
| 647 | } |
| 648 | |
| 649 | dev = ep->udc; |
| 650 | |
| 651 | if (!dev || !dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { |
| 652 | DBG("invalid device\n"); |
| 653 | return -EINVAL; |
| 654 | } |
| 655 | |
| 656 | _req->status = -EINPROGRESS; |
| 657 | _req->actual = 0; |
| 658 | |
| 659 | local_irq_save(flags); |
| 660 | |
| 661 | /* try to kickstart any empty and idle queue */ |
| 662 | if (list_empty(&ep->queue) && !ep->stopped) { |
| 663 | int is_ep0; |
| 664 | |
| 665 | /* |
| 666 | * If this control request has a non-empty DATA stage, this |
| 667 | * will start that stage. It works just like a non-control |
| 668 | * request (until the status stage starts, maybe early). |
| 669 | * |
| 670 | * If the data stage is empty, then this starts a successful |
| 671 | * IN/STATUS stage. (Unsuccessful ones use set_halt.) |
| 672 | */ |
| 673 | is_ep0 = (ep->ep.name == ep0name); |
| 674 | if (is_ep0) { |
| 675 | u32 tmp; |
| 676 | |
| 677 | if (!dev->req_pending) { |
| 678 | status = -EINVAL; |
| 679 | goto done; |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * defer changing CONFG until after the gadget driver |
| 684 | * reconfigures the endpoints. |
| 685 | */ |
| 686 | if (dev->wait_for_config_ack) { |
| 687 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); |
| 688 | tmp ^= AT91_UDP_CONFG; |
| 689 | VDBG("toggle config\n"); |
| 690 | at91_udp_write(AT91_UDP_GLB_STAT, tmp); |
| 691 | } |
| 692 | if (req->req.length == 0) { |
| 693 | ep0_in_status: |
| 694 | PACKET("ep0 in/status\n"); |
| 695 | status = 0; |
| 696 | tmp = __raw_readl(ep->creg); |
| 697 | tmp &= ~SET_FX; |
| 698 | tmp |= CLR_FX | AT91_UDP_TXPKTRDY; |
| 699 | __raw_writel(tmp, ep->creg); |
| 700 | dev->req_pending = 0; |
| 701 | goto done; |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | if (ep->is_in) |
| 706 | status = write_fifo(ep, req); |
| 707 | else { |
| 708 | status = read_fifo(ep, req); |
| 709 | |
| 710 | /* IN/STATUS stage is otherwise triggered by irq */ |
| 711 | if (status && is_ep0) |
| 712 | goto ep0_in_status; |
| 713 | } |
| 714 | } else |
| 715 | status = 0; |
| 716 | |
| 717 | if (req && !status) { |
| 718 | list_add_tail (&req->queue, &ep->queue); |
| 719 | at91_udp_write(AT91_UDP_IER, ep->int_mask); |
| 720 | } |
| 721 | done: |
| 722 | local_irq_restore(flags); |
| 723 | return (status < 0) ? status : 0; |
| 724 | } |
| 725 | |
| 726 | static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) |
| 727 | { |
| 728 | struct at91_ep *ep; |
| 729 | struct at91_request *req; |
| 730 | |
| 731 | ep = container_of(_ep, struct at91_ep, ep); |
| 732 | if (!_ep || ep->ep.name == ep0name) |
| 733 | return -EINVAL; |
| 734 | |
| 735 | /* make sure it's actually queued on this endpoint */ |
| 736 | list_for_each_entry (req, &ep->queue, queue) { |
| 737 | if (&req->req == _req) |
| 738 | break; |
| 739 | } |
| 740 | if (&req->req != _req) |
| 741 | return -EINVAL; |
| 742 | |
| 743 | done(ep, req, -ECONNRESET); |
| 744 | return 0; |
| 745 | } |
| 746 | |
| 747 | static int at91_ep_set_halt(struct usb_ep *_ep, int value) |
| 748 | { |
| 749 | struct at91_ep *ep = container_of(_ep, struct at91_ep, ep); |
| 750 | u32 __iomem *creg; |
| 751 | u32 csr; |
| 752 | unsigned long flags; |
| 753 | int status = 0; |
| 754 | |
| 755 | if (!_ep || ep->is_iso || !ep->udc->clocked) |
| 756 | return -EINVAL; |
| 757 | |
| 758 | creg = ep->creg; |
| 759 | local_irq_save(flags); |
| 760 | |
| 761 | csr = __raw_readl(creg); |
| 762 | |
| 763 | /* |
| 764 | * fail with still-busy IN endpoints, ensuring correct sequencing |
| 765 | * of data tx then stall. note that the fifo rx bytecount isn't |
| 766 | * completely accurate as a tx bytecount. |
| 767 | */ |
| 768 | if (ep->is_in && (!list_empty(&ep->queue) || (csr >> 16) != 0)) |
| 769 | status = -EAGAIN; |
| 770 | else { |
| 771 | csr |= CLR_FX; |
| 772 | csr &= ~SET_FX; |
| 773 | if (value) { |
| 774 | csr |= AT91_UDP_FORCESTALL; |
| 775 | VDBG("halt %s\n", ep->ep.name); |
| 776 | } else { |
| 777 | at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); |
| 778 | at91_udp_write(AT91_UDP_RST_EP, 0); |
| 779 | csr &= ~AT91_UDP_FORCESTALL; |
| 780 | } |
| 781 | __raw_writel(csr, creg); |
| 782 | } |
| 783 | |
| 784 | local_irq_restore(flags); |
| 785 | return status; |
| 786 | } |
| 787 | |
| 788 | static struct usb_ep_ops at91_ep_ops = { |
| 789 | .enable = at91_ep_enable, |
| 790 | .disable = at91_ep_disable, |
| 791 | .alloc_request = at91_ep_alloc_request, |
| 792 | .free_request = at91_ep_free_request, |
| 793 | .alloc_buffer = at91_ep_alloc_buffer, |
| 794 | .free_buffer = at91_ep_free_buffer, |
| 795 | .queue = at91_ep_queue, |
| 796 | .dequeue = at91_ep_dequeue, |
| 797 | .set_halt = at91_ep_set_halt, |
| 798 | // there's only imprecise fifo status reporting |
| 799 | }; |
| 800 | |
| 801 | /*-------------------------------------------------------------------------*/ |
| 802 | |
| 803 | static int at91_get_frame(struct usb_gadget *gadget) |
| 804 | { |
| 805 | if (!to_udc(gadget)->clocked) |
| 806 | return -EINVAL; |
| 807 | return at91_udp_read(AT91_UDP_FRM_NUM) & AT91_UDP_NUM; |
| 808 | } |
| 809 | |
| 810 | static int at91_wakeup(struct usb_gadget *gadget) |
| 811 | { |
| 812 | struct at91_udc *udc = to_udc(gadget); |
| 813 | u32 glbstate; |
| 814 | int status = -EINVAL; |
| 815 | unsigned long flags; |
| 816 | |
| 817 | DBG("%s\n", __FUNCTION__ ); |
| 818 | local_irq_save(flags); |
| 819 | |
| 820 | if (!udc->clocked || !udc->suspended) |
| 821 | goto done; |
| 822 | |
| 823 | /* NOTE: some "early versions" handle ESR differently ... */ |
| 824 | |
| 825 | glbstate = at91_udp_read(AT91_UDP_GLB_STAT); |
| 826 | if (!(glbstate & AT91_UDP_ESR)) |
| 827 | goto done; |
| 828 | glbstate |= AT91_UDP_ESR; |
| 829 | at91_udp_write(AT91_UDP_GLB_STAT, glbstate); |
| 830 | |
| 831 | done: |
| 832 | local_irq_restore(flags); |
| 833 | return status; |
| 834 | } |
| 835 | |
| 836 | /* reinit == restore inital software state */ |
| 837 | static void udc_reinit(struct at91_udc *udc) |
| 838 | { |
| 839 | u32 i; |
| 840 | |
| 841 | INIT_LIST_HEAD(&udc->gadget.ep_list); |
| 842 | INIT_LIST_HEAD(&udc->gadget.ep0->ep_list); |
| 843 | |
| 844 | for (i = 0; i < NUM_ENDPOINTS; i++) { |
| 845 | struct at91_ep *ep = &udc->ep[i]; |
| 846 | |
| 847 | if (i != 0) |
| 848 | list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list); |
| 849 | ep->desc = NULL; |
| 850 | ep->stopped = 0; |
| 851 | ep->fifo_bank = 0; |
| 852 | ep->ep.maxpacket = ep->maxpacket; |
| 853 | // initialiser une queue par endpoint |
| 854 | INIT_LIST_HEAD(&ep->queue); |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | static void stop_activity(struct at91_udc *udc) |
| 859 | { |
| 860 | struct usb_gadget_driver *driver = udc->driver; |
| 861 | int i; |
| 862 | |
| 863 | if (udc->gadget.speed == USB_SPEED_UNKNOWN) |
| 864 | driver = NULL; |
| 865 | udc->gadget.speed = USB_SPEED_UNKNOWN; |
| 866 | |
| 867 | for (i = 0; i < NUM_ENDPOINTS; i++) { |
| 868 | struct at91_ep *ep = &udc->ep[i]; |
| 869 | ep->stopped = 1; |
| 870 | nuke(ep, -ESHUTDOWN); |
| 871 | } |
| 872 | if (driver) |
| 873 | driver->disconnect(&udc->gadget); |
| 874 | |
| 875 | udc_reinit(udc); |
| 876 | } |
| 877 | |
| 878 | static void clk_on(struct at91_udc *udc) |
| 879 | { |
| 880 | if (udc->clocked) |
| 881 | return; |
| 882 | udc->clocked = 1; |
| 883 | clk_enable(udc->iclk); |
| 884 | clk_enable(udc->fclk); |
| 885 | } |
| 886 | |
| 887 | static void clk_off(struct at91_udc *udc) |
| 888 | { |
| 889 | if (!udc->clocked) |
| 890 | return; |
| 891 | udc->clocked = 0; |
| 892 | udc->gadget.speed = USB_SPEED_UNKNOWN; |
| 893 | clk_disable(udc->iclk); |
| 894 | clk_disable(udc->fclk); |
| 895 | } |
| 896 | |
| 897 | /* |
| 898 | * activate/deactivate link with host; minimize power usage for |
| 899 | * inactive links by cutting clocks and transceiver power. |
| 900 | */ |
| 901 | static void pullup(struct at91_udc *udc, int is_on) |
| 902 | { |
| 903 | if (!udc->enabled || !udc->vbus) |
| 904 | is_on = 0; |
| 905 | DBG("%sactive\n", is_on ? "" : "in"); |
| 906 | if (is_on) { |
| 907 | clk_on(udc); |
| 908 | at91_udp_write(AT91_UDP_TXVC, 0); |
| 909 | at91_set_gpio_value(udc->board.pullup_pin, 1); |
| 910 | } else { |
| 911 | stop_activity(udc); |
| 912 | at91_udp_write(AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); |
| 913 | at91_set_gpio_value(udc->board.pullup_pin, 0); |
| 914 | clk_off(udc); |
| 915 | |
| 916 | // REVISIT: with transceiver disabled, will D- float |
| 917 | // so that a host would falsely detect a device? |
| 918 | } |
| 919 | } |
| 920 | |
| 921 | /* vbus is here! turn everything on that's ready */ |
| 922 | static int at91_vbus_session(struct usb_gadget *gadget, int is_active) |
| 923 | { |
| 924 | struct at91_udc *udc = to_udc(gadget); |
| 925 | unsigned long flags; |
| 926 | |
| 927 | // VDBG("vbus %s\n", is_active ? "on" : "off"); |
| 928 | local_irq_save(flags); |
| 929 | udc->vbus = (is_active != 0); |
| 930 | pullup(udc, is_active); |
| 931 | local_irq_restore(flags); |
| 932 | return 0; |
| 933 | } |
| 934 | |
| 935 | static int at91_pullup(struct usb_gadget *gadget, int is_on) |
| 936 | { |
| 937 | struct at91_udc *udc = to_udc(gadget); |
| 938 | unsigned long flags; |
| 939 | |
| 940 | local_irq_save(flags); |
| 941 | udc->enabled = is_on = !!is_on; |
| 942 | pullup(udc, is_on); |
| 943 | local_irq_restore(flags); |
| 944 | return 0; |
| 945 | } |
| 946 | |
| 947 | static int at91_set_selfpowered(struct usb_gadget *gadget, int is_on) |
| 948 | { |
| 949 | struct at91_udc *udc = to_udc(gadget); |
| 950 | unsigned long flags; |
| 951 | |
| 952 | local_irq_save(flags); |
| 953 | udc->selfpowered = (is_on != 0); |
| 954 | local_irq_restore(flags); |
| 955 | return 0; |
| 956 | } |
| 957 | |
| 958 | static const struct usb_gadget_ops at91_udc_ops = { |
| 959 | .get_frame = at91_get_frame, |
| 960 | .wakeup = at91_wakeup, |
| 961 | .set_selfpowered = at91_set_selfpowered, |
| 962 | .vbus_session = at91_vbus_session, |
| 963 | .pullup = at91_pullup, |
| 964 | |
| 965 | /* |
| 966 | * VBUS-powered devices may also also want to support bigger |
| 967 | * power budgets after an appropriate SET_CONFIGURATION. |
| 968 | */ |
| 969 | // .vbus_power = at91_vbus_power, |
| 970 | }; |
| 971 | |
| 972 | /*-------------------------------------------------------------------------*/ |
| 973 | |
| 974 | static int handle_ep(struct at91_ep *ep) |
| 975 | { |
| 976 | struct at91_request *req; |
| 977 | u32 __iomem *creg = ep->creg; |
| 978 | u32 csr = __raw_readl(creg); |
| 979 | |
| 980 | if (!list_empty(&ep->queue)) |
| 981 | req = list_entry(ep->queue.next, |
| 982 | struct at91_request, queue); |
| 983 | else |
| 984 | req = NULL; |
| 985 | |
| 986 | if (ep->is_in) { |
| 987 | if (csr & (AT91_UDP_STALLSENT | AT91_UDP_TXCOMP)) { |
| 988 | csr |= CLR_FX; |
| 989 | csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_TXCOMP); |
| 990 | __raw_writel(csr, creg); |
| 991 | } |
| 992 | if (req) |
| 993 | return write_fifo(ep, req); |
| 994 | |
| 995 | } else { |
| 996 | if (csr & AT91_UDP_STALLSENT) { |
| 997 | /* STALLSENT bit == ISOERR */ |
| 998 | if (ep->is_iso && req) |
| 999 | req->req.status = -EILSEQ; |
| 1000 | csr |= CLR_FX; |
| 1001 | csr &= ~(SET_FX | AT91_UDP_STALLSENT); |
| 1002 | __raw_writel(csr, creg); |
| 1003 | csr = __raw_readl(creg); |
| 1004 | } |
| 1005 | if (req && (csr & RX_DATA_READY)) |
| 1006 | return read_fifo(ep, req); |
| 1007 | } |
| 1008 | return 0; |
| 1009 | } |
| 1010 | |
| 1011 | union setup { |
| 1012 | u8 raw[8]; |
| 1013 | struct usb_ctrlrequest r; |
| 1014 | }; |
| 1015 | |
| 1016 | static void handle_setup(struct at91_udc *udc, struct at91_ep *ep, u32 csr) |
| 1017 | { |
| 1018 | u32 __iomem *creg = ep->creg; |
| 1019 | u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0)); |
| 1020 | unsigned rxcount, i = 0; |
| 1021 | u32 tmp; |
| 1022 | union setup pkt; |
| 1023 | int status = 0; |
| 1024 | |
| 1025 | /* read and ack SETUP; hard-fail for bogus packets */ |
| 1026 | rxcount = (csr & AT91_UDP_RXBYTECNT) >> 16; |
| 1027 | if (likely(rxcount == 8)) { |
| 1028 | while (rxcount--) |
| 1029 | pkt.raw[i++] = __raw_readb(dreg); |
| 1030 | if (pkt.r.bRequestType & USB_DIR_IN) { |
| 1031 | csr |= AT91_UDP_DIR; |
| 1032 | ep->is_in = 1; |
| 1033 | } else { |
| 1034 | csr &= ~AT91_UDP_DIR; |
| 1035 | ep->is_in = 0; |
| 1036 | } |
| 1037 | } else { |
| 1038 | // REVISIT this happens sometimes under load; why?? |
| 1039 | ERR("SETUP len %d, csr %08x\n", rxcount, csr); |
| 1040 | status = -EINVAL; |
| 1041 | } |
| 1042 | csr |= CLR_FX; |
| 1043 | csr &= ~(SET_FX | AT91_UDP_RXSETUP); |
| 1044 | __raw_writel(csr, creg); |
| 1045 | udc->wait_for_addr_ack = 0; |
| 1046 | udc->wait_for_config_ack = 0; |
| 1047 | ep->stopped = 0; |
| 1048 | if (unlikely(status != 0)) |
| 1049 | goto stall; |
| 1050 | |
| 1051 | #define w_index le16_to_cpu(pkt.r.wIndex) |
| 1052 | #define w_value le16_to_cpu(pkt.r.wValue) |
| 1053 | #define w_length le16_to_cpu(pkt.r.wLength) |
| 1054 | |
| 1055 | VDBG("SETUP %02x.%02x v%04x i%04x l%04x\n", |
| 1056 | pkt.r.bRequestType, pkt.r.bRequest, |
| 1057 | w_value, w_index, w_length); |
| 1058 | |
| 1059 | /* |
| 1060 | * A few standard requests get handled here, ones that touch |
| 1061 | * hardware ... notably for device and endpoint features. |
| 1062 | */ |
| 1063 | udc->req_pending = 1; |
| 1064 | csr = __raw_readl(creg); |
| 1065 | csr |= CLR_FX; |
| 1066 | csr &= ~SET_FX; |
| 1067 | switch ((pkt.r.bRequestType << 8) | pkt.r.bRequest) { |
| 1068 | |
| 1069 | case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) |
| 1070 | | USB_REQ_SET_ADDRESS: |
| 1071 | __raw_writel(csr | AT91_UDP_TXPKTRDY, creg); |
| 1072 | udc->addr = w_value; |
| 1073 | udc->wait_for_addr_ack = 1; |
| 1074 | udc->req_pending = 0; |
| 1075 | /* FADDR is set later, when we ack host STATUS */ |
| 1076 | return; |
| 1077 | |
| 1078 | case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) |
| 1079 | | USB_REQ_SET_CONFIGURATION: |
| 1080 | tmp = at91_udp_read(AT91_UDP_GLB_STAT) & AT91_UDP_CONFG; |
| 1081 | if (pkt.r.wValue) |
| 1082 | udc->wait_for_config_ack = (tmp == 0); |
| 1083 | else |
| 1084 | udc->wait_for_config_ack = (tmp != 0); |
| 1085 | if (udc->wait_for_config_ack) |
| 1086 | VDBG("wait for config\n"); |
| 1087 | /* CONFG is toggled later, if gadget driver succeeds */ |
| 1088 | break; |
| 1089 | |
| 1090 | /* |
| 1091 | * Hosts may set or clear remote wakeup status, and |
| 1092 | * devices may report they're VBUS powered. |
| 1093 | */ |
| 1094 | case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) |
| 1095 | | USB_REQ_GET_STATUS: |
| 1096 | tmp = (udc->selfpowered << USB_DEVICE_SELF_POWERED); |
| 1097 | if (at91_udp_read(AT91_UDP_GLB_STAT) & AT91_UDP_ESR) |
| 1098 | tmp |= (1 << USB_DEVICE_REMOTE_WAKEUP); |
| 1099 | PACKET("get device status\n"); |
| 1100 | __raw_writeb(tmp, dreg); |
| 1101 | __raw_writeb(0, dreg); |
| 1102 | goto write_in; |
| 1103 | /* then STATUS starts later, automatically */ |
| 1104 | case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) |
| 1105 | | USB_REQ_SET_FEATURE: |
| 1106 | if (w_value != USB_DEVICE_REMOTE_WAKEUP) |
| 1107 | goto stall; |
| 1108 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); |
| 1109 | tmp |= AT91_UDP_ESR; |
| 1110 | at91_udp_write(AT91_UDP_GLB_STAT, tmp); |
| 1111 | goto succeed; |
| 1112 | case ((USB_TYPE_STANDARD|USB_RECIP_DEVICE) << 8) |
| 1113 | | USB_REQ_CLEAR_FEATURE: |
| 1114 | if (w_value != USB_DEVICE_REMOTE_WAKEUP) |
| 1115 | goto stall; |
| 1116 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); |
| 1117 | tmp &= ~AT91_UDP_ESR; |
| 1118 | at91_udp_write(AT91_UDP_GLB_STAT, tmp); |
| 1119 | goto succeed; |
| 1120 | |
| 1121 | /* |
| 1122 | * Interfaces have no feature settings; this is pretty useless. |
| 1123 | * we won't even insist the interface exists... |
| 1124 | */ |
| 1125 | case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) |
| 1126 | | USB_REQ_GET_STATUS: |
| 1127 | PACKET("get interface status\n"); |
| 1128 | __raw_writeb(0, dreg); |
| 1129 | __raw_writeb(0, dreg); |
| 1130 | goto write_in; |
| 1131 | /* then STATUS starts later, automatically */ |
| 1132 | case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) |
| 1133 | | USB_REQ_SET_FEATURE: |
| 1134 | case ((USB_TYPE_STANDARD|USB_RECIP_INTERFACE) << 8) |
| 1135 | | USB_REQ_CLEAR_FEATURE: |
| 1136 | goto stall; |
| 1137 | |
| 1138 | /* |
| 1139 | * Hosts may clear bulk/intr endpoint halt after the gadget |
| 1140 | * driver sets it (not widely used); or set it (for testing) |
| 1141 | */ |
| 1142 | case ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) |
| 1143 | | USB_REQ_GET_STATUS: |
| 1144 | tmp = w_index & USB_ENDPOINT_NUMBER_MASK; |
| 1145 | ep = &udc->ep[tmp]; |
| 1146 | if (tmp > NUM_ENDPOINTS || (tmp && !ep->desc)) |
| 1147 | goto stall; |
| 1148 | |
| 1149 | if (tmp) { |
| 1150 | if ((w_index & USB_DIR_IN)) { |
| 1151 | if (!ep->is_in) |
| 1152 | goto stall; |
| 1153 | } else if (ep->is_in) |
| 1154 | goto stall; |
| 1155 | } |
| 1156 | PACKET("get %s status\n", ep->ep.name); |
| 1157 | if (__raw_readl(ep->creg) & AT91_UDP_FORCESTALL) |
| 1158 | tmp = (1 << USB_ENDPOINT_HALT); |
| 1159 | else |
| 1160 | tmp = 0; |
| 1161 | __raw_writeb(tmp, dreg); |
| 1162 | __raw_writeb(0, dreg); |
| 1163 | goto write_in; |
| 1164 | /* then STATUS starts later, automatically */ |
| 1165 | case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) |
| 1166 | | USB_REQ_SET_FEATURE: |
| 1167 | tmp = w_index & USB_ENDPOINT_NUMBER_MASK; |
| 1168 | ep = &udc->ep[tmp]; |
| 1169 | if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS) |
| 1170 | goto stall; |
| 1171 | if (!ep->desc || ep->is_iso) |
| 1172 | goto stall; |
| 1173 | if ((w_index & USB_DIR_IN)) { |
| 1174 | if (!ep->is_in) |
| 1175 | goto stall; |
| 1176 | } else if (ep->is_in) |
| 1177 | goto stall; |
| 1178 | |
| 1179 | tmp = __raw_readl(ep->creg); |
| 1180 | tmp &= ~SET_FX; |
| 1181 | tmp |= CLR_FX | AT91_UDP_FORCESTALL; |
| 1182 | __raw_writel(tmp, ep->creg); |
| 1183 | goto succeed; |
| 1184 | case ((USB_TYPE_STANDARD|USB_RECIP_ENDPOINT) << 8) |
| 1185 | | USB_REQ_CLEAR_FEATURE: |
| 1186 | tmp = w_index & USB_ENDPOINT_NUMBER_MASK; |
| 1187 | ep = &udc->ep[tmp]; |
| 1188 | if (w_value != USB_ENDPOINT_HALT || tmp > NUM_ENDPOINTS) |
| 1189 | goto stall; |
| 1190 | if (tmp == 0) |
| 1191 | goto succeed; |
| 1192 | if (!ep->desc || ep->is_iso) |
| 1193 | goto stall; |
| 1194 | if ((w_index & USB_DIR_IN)) { |
| 1195 | if (!ep->is_in) |
| 1196 | goto stall; |
| 1197 | } else if (ep->is_in) |
| 1198 | goto stall; |
| 1199 | |
| 1200 | at91_udp_write(AT91_UDP_RST_EP, ep->int_mask); |
| 1201 | at91_udp_write(AT91_UDP_RST_EP, 0); |
| 1202 | tmp = __raw_readl(ep->creg); |
| 1203 | tmp |= CLR_FX; |
| 1204 | tmp &= ~(SET_FX | AT91_UDP_FORCESTALL); |
| 1205 | __raw_writel(tmp, ep->creg); |
| 1206 | if (!list_empty(&ep->queue)) |
| 1207 | handle_ep(ep); |
| 1208 | goto succeed; |
| 1209 | } |
| 1210 | |
| 1211 | #undef w_value |
| 1212 | #undef w_index |
| 1213 | #undef w_length |
| 1214 | |
| 1215 | /* pass request up to the gadget driver */ |
| 1216 | status = udc->driver->setup(&udc->gadget, &pkt.r); |
| 1217 | if (status < 0) { |
| 1218 | stall: |
| 1219 | VDBG("req %02x.%02x protocol STALL; stat %d\n", |
| 1220 | pkt.r.bRequestType, pkt.r.bRequest, status); |
| 1221 | csr |= AT91_UDP_FORCESTALL; |
| 1222 | __raw_writel(csr, creg); |
| 1223 | udc->req_pending = 0; |
| 1224 | } |
| 1225 | return; |
| 1226 | |
| 1227 | succeed: |
| 1228 | /* immediate successful (IN) STATUS after zero length DATA */ |
| 1229 | PACKET("ep0 in/status\n"); |
| 1230 | write_in: |
| 1231 | csr |= AT91_UDP_TXPKTRDY; |
| 1232 | __raw_writel(csr, creg); |
| 1233 | udc->req_pending = 0; |
| 1234 | return; |
| 1235 | } |
| 1236 | |
| 1237 | static void handle_ep0(struct at91_udc *udc) |
| 1238 | { |
| 1239 | struct at91_ep *ep0 = &udc->ep[0]; |
| 1240 | u32 __iomem *creg = ep0->creg; |
| 1241 | u32 csr = __raw_readl(creg); |
| 1242 | struct at91_request *req; |
| 1243 | |
| 1244 | if (unlikely(csr & AT91_UDP_STALLSENT)) { |
| 1245 | nuke(ep0, -EPROTO); |
| 1246 | udc->req_pending = 0; |
| 1247 | csr |= CLR_FX; |
| 1248 | csr &= ~(SET_FX | AT91_UDP_STALLSENT | AT91_UDP_FORCESTALL); |
| 1249 | __raw_writel(csr, creg); |
| 1250 | VDBG("ep0 stalled\n"); |
| 1251 | csr = __raw_readl(creg); |
| 1252 | } |
| 1253 | if (csr & AT91_UDP_RXSETUP) { |
| 1254 | nuke(ep0, 0); |
| 1255 | udc->req_pending = 0; |
| 1256 | handle_setup(udc, ep0, csr); |
| 1257 | return; |
| 1258 | } |
| 1259 | |
| 1260 | if (list_empty(&ep0->queue)) |
| 1261 | req = NULL; |
| 1262 | else |
| 1263 | req = list_entry(ep0->queue.next, struct at91_request, queue); |
| 1264 | |
| 1265 | /* host ACKed an IN packet that we sent */ |
| 1266 | if (csr & AT91_UDP_TXCOMP) { |
| 1267 | csr |= CLR_FX; |
| 1268 | csr &= ~(SET_FX | AT91_UDP_TXCOMP); |
| 1269 | |
| 1270 | /* write more IN DATA? */ |
| 1271 | if (req && ep0->is_in) { |
| 1272 | if (handle_ep(ep0)) |
| 1273 | udc->req_pending = 0; |
| 1274 | |
| 1275 | /* |
| 1276 | * Ack after: |
| 1277 | * - last IN DATA packet (including GET_STATUS) |
| 1278 | * - IN/STATUS for OUT DATA |
| 1279 | * - IN/STATUS for any zero-length DATA stage |
| 1280 | * except for the IN DATA case, the host should send |
| 1281 | * an OUT status later, which we'll ack. |
| 1282 | */ |
| 1283 | } else { |
| 1284 | udc->req_pending = 0; |
| 1285 | __raw_writel(csr, creg); |
| 1286 | |
| 1287 | /* |
| 1288 | * SET_ADDRESS takes effect only after the STATUS |
| 1289 | * (to the original address) gets acked. |
| 1290 | */ |
| 1291 | if (udc->wait_for_addr_ack) { |
| 1292 | u32 tmp; |
| 1293 | |
| 1294 | at91_udp_write(AT91_UDP_FADDR, AT91_UDP_FEN | udc->addr); |
| 1295 | tmp = at91_udp_read(AT91_UDP_GLB_STAT); |
| 1296 | tmp &= ~AT91_UDP_FADDEN; |
| 1297 | if (udc->addr) |
| 1298 | tmp |= AT91_UDP_FADDEN; |
| 1299 | at91_udp_write(AT91_UDP_GLB_STAT, tmp); |
| 1300 | |
| 1301 | udc->wait_for_addr_ack = 0; |
| 1302 | VDBG("address %d\n", udc->addr); |
| 1303 | } |
| 1304 | } |
| 1305 | } |
| 1306 | |
| 1307 | /* OUT packet arrived ... */ |
| 1308 | else if (csr & AT91_UDP_RX_DATA_BK0) { |
| 1309 | csr |= CLR_FX; |
| 1310 | csr &= ~(SET_FX | AT91_UDP_RX_DATA_BK0); |
| 1311 | |
| 1312 | /* OUT DATA stage */ |
| 1313 | if (!ep0->is_in) { |
| 1314 | if (req) { |
| 1315 | if (handle_ep(ep0)) { |
| 1316 | /* send IN/STATUS */ |
| 1317 | PACKET("ep0 in/status\n"); |
| 1318 | csr = __raw_readl(creg); |
| 1319 | csr &= ~SET_FX; |
| 1320 | csr |= CLR_FX | AT91_UDP_TXPKTRDY; |
| 1321 | __raw_writel(csr, creg); |
| 1322 | udc->req_pending = 0; |
| 1323 | } |
| 1324 | } else if (udc->req_pending) { |
| 1325 | /* |
| 1326 | * AT91 hardware has a hard time with this |
| 1327 | * "deferred response" mode for control-OUT |
| 1328 | * transfers. (For control-IN it's fine.) |
| 1329 | * |
| 1330 | * The normal solution leaves OUT data in the |
| 1331 | * fifo until the gadget driver is ready. |
| 1332 | * We couldn't do that here without disabling |
| 1333 | * the IRQ that tells about SETUP packets, |
| 1334 | * e.g. when the host gets impatient... |
| 1335 | * |
| 1336 | * Working around it by copying into a buffer |
| 1337 | * would almost be a non-deferred response, |
| 1338 | * except that it wouldn't permit reliable |
| 1339 | * stalling of the request. Instead, demand |
| 1340 | * that gadget drivers not use this mode. |
| 1341 | */ |
| 1342 | DBG("no control-OUT deferred responses!\n"); |
| 1343 | __raw_writel(csr | AT91_UDP_FORCESTALL, creg); |
| 1344 | udc->req_pending = 0; |
| 1345 | } |
| 1346 | |
| 1347 | /* STATUS stage for control-IN; ack. */ |
| 1348 | } else { |
| 1349 | PACKET("ep0 out/status ACK\n"); |
| 1350 | __raw_writel(csr, creg); |
| 1351 | |
| 1352 | /* "early" status stage */ |
| 1353 | if (req) |
| 1354 | done(ep0, req, 0); |
| 1355 | } |
| 1356 | } |
| 1357 | } |
| 1358 | |
| 1359 | static irqreturn_t at91_udc_irq (int irq, void *_udc, struct pt_regs *r) |
| 1360 | { |
| 1361 | struct at91_udc *udc = _udc; |
| 1362 | u32 rescans = 5; |
| 1363 | |
| 1364 | while (rescans--) { |
| 1365 | u32 status = at91_udp_read(AT91_UDP_ISR); |
| 1366 | |
| 1367 | status &= at91_udp_read(AT91_UDP_IMR); |
| 1368 | if (!status) |
| 1369 | break; |
| 1370 | |
| 1371 | /* USB reset irq: not maskable */ |
| 1372 | if (status & AT91_UDP_ENDBUSRES) { |
| 1373 | at91_udp_write(AT91_UDP_IDR, ~MINIMUS_INTERRUPTUS); |
| 1374 | at91_udp_write(AT91_UDP_IER, MINIMUS_INTERRUPTUS); |
| 1375 | /* Atmel code clears this irq twice */ |
| 1376 | at91_udp_write(AT91_UDP_ICR, AT91_UDP_ENDBUSRES); |
| 1377 | at91_udp_write(AT91_UDP_ICR, AT91_UDP_ENDBUSRES); |
| 1378 | VDBG("end bus reset\n"); |
| 1379 | udc->addr = 0; |
| 1380 | stop_activity(udc); |
| 1381 | |
| 1382 | /* enable ep0 */ |
| 1383 | at91_udp_write(AT91_UDP_CSR(0), AT91_UDP_EPEDS | AT91_UDP_EPTYPE_CTRL); |
| 1384 | udc->gadget.speed = USB_SPEED_FULL; |
| 1385 | udc->suspended = 0; |
| 1386 | at91_udp_write(AT91_UDP_IER, AT91_UDP_EP(0)); |
| 1387 | |
| 1388 | /* |
| 1389 | * NOTE: this driver keeps clocks off unless the |
| 1390 | * USB host is present. That saves power, and also |
| 1391 | * eliminates IRQs (reset, resume, suspend) that can |
| 1392 | * otherwise flood from the controller. If your |
| 1393 | * board doesn't support VBUS detection, suspend and |
| 1394 | * resume irq logic may need more attention... |
| 1395 | */ |
| 1396 | |
| 1397 | /* host initiated suspend (3+ms bus idle) */ |
| 1398 | } else if (status & AT91_UDP_RXSUSP) { |
| 1399 | at91_udp_write(AT91_UDP_IDR, AT91_UDP_RXSUSP); |
| 1400 | at91_udp_write(AT91_UDP_IER, AT91_UDP_RXRSM); |
| 1401 | at91_udp_write(AT91_UDP_ICR, AT91_UDP_RXSUSP); |
| 1402 | // VDBG("bus suspend\n"); |
| 1403 | if (udc->suspended) |
| 1404 | continue; |
| 1405 | udc->suspended = 1; |
| 1406 | |
| 1407 | /* |
| 1408 | * NOTE: when suspending a VBUS-powered device, the |
| 1409 | * gadget driver should switch into slow clock mode |
| 1410 | * and then into standby to avoid drawing more than |
| 1411 | * 500uA power (2500uA for some high-power configs). |
| 1412 | */ |
| 1413 | if (udc->driver && udc->driver->suspend) |
| 1414 | udc->driver->suspend(&udc->gadget); |
| 1415 | |
| 1416 | /* host initiated resume */ |
| 1417 | } else if (status & AT91_UDP_RXRSM) { |
| 1418 | at91_udp_write(AT91_UDP_IDR, AT91_UDP_RXRSM); |
| 1419 | at91_udp_write(AT91_UDP_IER, AT91_UDP_RXSUSP); |
| 1420 | at91_udp_write(AT91_UDP_ICR, AT91_UDP_RXRSM); |
| 1421 | // VDBG("bus resume\n"); |
| 1422 | if (!udc->suspended) |
| 1423 | continue; |
| 1424 | udc->suspended = 0; |
| 1425 | |
| 1426 | /* |
| 1427 | * NOTE: for a VBUS-powered device, the gadget driver |
| 1428 | * would normally want to switch out of slow clock |
| 1429 | * mode into normal mode. |
| 1430 | */ |
| 1431 | if (udc->driver && udc->driver->resume) |
| 1432 | udc->driver->resume(&udc->gadget); |
| 1433 | |
| 1434 | /* endpoint IRQs are cleared by handling them */ |
| 1435 | } else { |
| 1436 | int i; |
| 1437 | unsigned mask = 1; |
| 1438 | struct at91_ep *ep = &udc->ep[1]; |
| 1439 | |
| 1440 | if (status & mask) |
| 1441 | handle_ep0(udc); |
| 1442 | for (i = 1; i < NUM_ENDPOINTS; i++) { |
| 1443 | mask <<= 1; |
| 1444 | if (status & mask) |
| 1445 | handle_ep(ep); |
| 1446 | ep++; |
| 1447 | } |
| 1448 | } |
| 1449 | } |
| 1450 | |
| 1451 | return IRQ_HANDLED; |
| 1452 | } |
| 1453 | |
| 1454 | /*-------------------------------------------------------------------------*/ |
| 1455 | |
| 1456 | static struct at91_udc controller = { |
| 1457 | .gadget = { |
| 1458 | .ops = &at91_udc_ops, |
| 1459 | .ep0 = &controller.ep[0].ep, |
| 1460 | .name = driver_name, |
| 1461 | .dev = { |
| 1462 | .bus_id = "gadget" |
| 1463 | } |
| 1464 | }, |
| 1465 | .ep[0] = { |
| 1466 | .ep = { |
| 1467 | .name = ep0name, |
| 1468 | .ops = &at91_ep_ops, |
| 1469 | }, |
| 1470 | .udc = &controller, |
| 1471 | .maxpacket = 8, |
| 1472 | .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(0)), |
| 1473 | .int_mask = 1 << 0, |
| 1474 | }, |
| 1475 | .ep[1] = { |
| 1476 | .ep = { |
| 1477 | .name = "ep1", |
| 1478 | .ops = &at91_ep_ops, |
| 1479 | }, |
| 1480 | .udc = &controller, |
| 1481 | .is_pingpong = 1, |
| 1482 | .maxpacket = 64, |
| 1483 | .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(1)), |
| 1484 | .int_mask = 1 << 1, |
| 1485 | }, |
| 1486 | .ep[2] = { |
| 1487 | .ep = { |
| 1488 | .name = "ep2", |
| 1489 | .ops = &at91_ep_ops, |
| 1490 | }, |
| 1491 | .udc = &controller, |
| 1492 | .is_pingpong = 1, |
| 1493 | .maxpacket = 64, |
| 1494 | .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(2)), |
| 1495 | .int_mask = 1 << 2, |
| 1496 | }, |
| 1497 | .ep[3] = { |
| 1498 | .ep = { |
| 1499 | /* could actually do bulk too */ |
| 1500 | .name = "ep3-int", |
| 1501 | .ops = &at91_ep_ops, |
| 1502 | }, |
| 1503 | .udc = &controller, |
| 1504 | .maxpacket = 8, |
| 1505 | .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(3)), |
| 1506 | .int_mask = 1 << 3, |
| 1507 | }, |
| 1508 | .ep[4] = { |
| 1509 | .ep = { |
| 1510 | .name = "ep4", |
| 1511 | .ops = &at91_ep_ops, |
| 1512 | }, |
| 1513 | .udc = &controller, |
| 1514 | .is_pingpong = 1, |
| 1515 | .maxpacket = 256, |
| 1516 | .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(4)), |
| 1517 | .int_mask = 1 << 4, |
| 1518 | }, |
| 1519 | .ep[5] = { |
| 1520 | .ep = { |
| 1521 | .name = "ep5", |
| 1522 | .ops = &at91_ep_ops, |
| 1523 | }, |
| 1524 | .udc = &controller, |
| 1525 | .is_pingpong = 1, |
| 1526 | .maxpacket = 256, |
| 1527 | .creg = (void __iomem *)(AT91_VA_BASE_UDP + AT91_UDP_CSR(5)), |
| 1528 | .int_mask = 1 << 5, |
| 1529 | }, |
| 1530 | /* ep6 and ep7 are also reserved */ |
| 1531 | }; |
| 1532 | |
| 1533 | static irqreturn_t at91_vbus_irq(int irq, void *_udc, struct pt_regs *r) |
| 1534 | { |
| 1535 | struct at91_udc *udc = _udc; |
| 1536 | unsigned value; |
| 1537 | |
| 1538 | /* vbus needs at least brief debouncing */ |
| 1539 | udelay(10); |
| 1540 | value = at91_get_gpio_value(udc->board.vbus_pin); |
| 1541 | if (value != udc->vbus) |
| 1542 | at91_vbus_session(&udc->gadget, value); |
| 1543 | |
| 1544 | return IRQ_HANDLED; |
| 1545 | } |
| 1546 | |
| 1547 | int usb_gadget_register_driver (struct usb_gadget_driver *driver) |
| 1548 | { |
| 1549 | struct at91_udc *udc = &controller; |
| 1550 | int retval; |
| 1551 | |
| 1552 | if (!driver |
| 1553 | || driver->speed != USB_SPEED_FULL |
| 1554 | || !driver->bind |
| 1555 | || !driver->unbind |
| 1556 | || !driver->setup) { |
| 1557 | DBG("bad parameter.\n"); |
| 1558 | return -EINVAL; |
| 1559 | } |
| 1560 | |
| 1561 | if (udc->driver) { |
| 1562 | DBG("UDC already has a gadget driver\n"); |
| 1563 | return -EBUSY; |
| 1564 | } |
| 1565 | |
| 1566 | udc->driver = driver; |
| 1567 | udc->gadget.dev.driver = &driver->driver; |
| 1568 | udc->gadget.dev.driver_data = &driver->driver; |
| 1569 | udc->enabled = 1; |
| 1570 | udc->selfpowered = 1; |
| 1571 | |
| 1572 | retval = driver->bind(&udc->gadget); |
| 1573 | if (retval) { |
| 1574 | DBG("driver->bind() returned %d\n", retval); |
| 1575 | udc->driver = NULL; |
| 1576 | return retval; |
| 1577 | } |
| 1578 | |
| 1579 | local_irq_disable(); |
| 1580 | pullup(udc, 1); |
| 1581 | local_irq_enable(); |
| 1582 | |
| 1583 | DBG("bound to %s\n", driver->driver.name); |
| 1584 | return 0; |
| 1585 | } |
| 1586 | EXPORT_SYMBOL (usb_gadget_register_driver); |
| 1587 | |
| 1588 | int usb_gadget_unregister_driver (struct usb_gadget_driver *driver) |
| 1589 | { |
| 1590 | struct at91_udc *udc = &controller; |
| 1591 | |
| 1592 | if (!driver || driver != udc->driver) |
| 1593 | return -EINVAL; |
| 1594 | |
| 1595 | local_irq_disable(); |
| 1596 | udc->enabled = 0; |
| 1597 | pullup(udc, 0); |
| 1598 | local_irq_enable(); |
| 1599 | |
| 1600 | driver->unbind(&udc->gadget); |
| 1601 | udc->driver = NULL; |
| 1602 | |
| 1603 | DBG("unbound from %s\n", driver->driver.name); |
| 1604 | return 0; |
| 1605 | } |
| 1606 | EXPORT_SYMBOL (usb_gadget_unregister_driver); |
| 1607 | |
| 1608 | /*-------------------------------------------------------------------------*/ |
| 1609 | |
| 1610 | static void at91udc_shutdown(struct platform_device *dev) |
| 1611 | { |
| 1612 | /* force disconnect on reboot */ |
| 1613 | pullup(platform_get_drvdata(dev), 0); |
| 1614 | } |
| 1615 | |
| 1616 | static int __devinit at91udc_probe(struct platform_device *pdev) |
| 1617 | { |
| 1618 | struct device *dev = &pdev->dev; |
| 1619 | struct at91_udc *udc; |
| 1620 | int retval; |
| 1621 | |
| 1622 | if (!dev->platform_data) { |
| 1623 | /* small (so we copy it) but critical! */ |
| 1624 | DBG("missing platform_data\n"); |
| 1625 | return -ENODEV; |
| 1626 | } |
| 1627 | |
| 1628 | if (!request_mem_region(AT91_BASE_UDP, SZ_16K, driver_name)) { |
| 1629 | DBG("someone's using UDC memory\n"); |
| 1630 | return -EBUSY; |
| 1631 | } |
| 1632 | |
| 1633 | /* init software state */ |
| 1634 | udc = &controller; |
| 1635 | udc->gadget.dev.parent = dev; |
| 1636 | udc->board = *(struct at91_udc_data *) dev->platform_data; |
| 1637 | udc->pdev = pdev; |
| 1638 | udc_reinit(udc); |
| 1639 | udc->enabled = 0; |
| 1640 | |
| 1641 | /* get interface and function clocks */ |
| 1642 | udc->iclk = clk_get(dev, "udc_clk"); |
| 1643 | udc->fclk = clk_get(dev, "udpck"); |
| 1644 | if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) { |
| 1645 | DBG("clocks missing\n"); |
| 1646 | return -ENODEV; |
| 1647 | } |
| 1648 | |
| 1649 | retval = device_register(&udc->gadget.dev); |
| 1650 | if (retval < 0) |
| 1651 | goto fail0; |
| 1652 | |
| 1653 | /* disable everything until there's a gadget driver and vbus */ |
| 1654 | pullup(udc, 0); |
| 1655 | |
| 1656 | /* request UDC and maybe VBUS irqs */ |
| 1657 | if (request_irq(AT91_ID_UDP, at91_udc_irq, SA_INTERRUPT, driver_name, udc)) { |
| 1658 | DBG("request irq %d failed\n", AT91_ID_UDP); |
| 1659 | retval = -EBUSY; |
| 1660 | goto fail1; |
| 1661 | } |
| 1662 | if (udc->board.vbus_pin > 0) { |
| 1663 | if (request_irq(udc->board.vbus_pin, at91_vbus_irq, SA_INTERRUPT, driver_name, udc)) { |
| 1664 | DBG("request vbus irq %d failed\n", udc->board.vbus_pin); |
| 1665 | free_irq(AT91_ID_UDP, udc); |
| 1666 | retval = -EBUSY; |
| 1667 | goto fail1; |
| 1668 | } |
| 1669 | } else { |
| 1670 | DBG("no VBUS detection, assuming always-on\n"); |
| 1671 | udc->vbus = 1; |
| 1672 | } |
| 1673 | dev_set_drvdata(dev, udc); |
| 1674 | create_debug_file(udc); |
| 1675 | |
| 1676 | INFO("%s version %s\n", driver_name, DRIVER_VERSION); |
| 1677 | return 0; |
| 1678 | |
| 1679 | fail1: |
| 1680 | device_unregister(&udc->gadget.dev); |
| 1681 | fail0: |
| 1682 | release_mem_region(AT91_VA_BASE_UDP, SZ_16K); |
| 1683 | DBG("%s probe failed, %d\n", driver_name, retval); |
| 1684 | return retval; |
| 1685 | } |
| 1686 | |
| 1687 | static int __devexit at91udc_remove(struct platform_device *dev) |
| 1688 | { |
| 1689 | struct at91_udc *udc = platform_get_drvdata(dev); |
| 1690 | |
| 1691 | DBG("remove\n"); |
| 1692 | |
| 1693 | pullup(udc, 0); |
| 1694 | |
| 1695 | if (udc->driver != 0) |
| 1696 | usb_gadget_unregister_driver(udc->driver); |
| 1697 | |
| 1698 | remove_debug_file(udc); |
| 1699 | if (udc->board.vbus_pin > 0) |
| 1700 | free_irq(udc->board.vbus_pin, udc); |
| 1701 | free_irq(AT91_ID_UDP, udc); |
| 1702 | device_unregister(&udc->gadget.dev); |
| 1703 | release_mem_region(AT91_BASE_UDP, SZ_16K); |
| 1704 | |
| 1705 | clk_put(udc->iclk); |
| 1706 | clk_put(udc->fclk); |
| 1707 | |
| 1708 | return 0; |
| 1709 | } |
| 1710 | |
| 1711 | #ifdef CONFIG_PM |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 1712 | static int at91udc_suspend(struct platform_device *dev, pm_message_t mesg) |
David Brownell | bae4bd8 | 2006-01-22 10:32:37 -0800 | [diff] [blame] | 1713 | { |
| 1714 | struct at91_udc *udc = platform_get_drvdata(dev); |
| 1715 | |
| 1716 | /* |
| 1717 | * The "safe" suspend transitions are opportunistic ... e.g. when |
| 1718 | * the USB link is suspended (48MHz clock autogated off), or when |
| 1719 | * it's disconnected (programmatically gated off, elsewhere). |
| 1720 | * Then we can suspend, and the chip can enter slow clock mode. |
| 1721 | * |
| 1722 | * The problem case is some component (user mode?) suspending this |
| 1723 | * device while it's active, with the 48 MHz clock in use. There |
| 1724 | * are two basic approaches: (a) veto suspend levels involving slow |
| 1725 | * clock mode, (b) disconnect, so 48 MHz will no longer be in use |
| 1726 | * and we can enter slow clock mode. This uses (b) for now, since |
| 1727 | * it's simplest until AT91 PM exists and supports the other option. |
| 1728 | */ |
| 1729 | if (udc->vbus && !udc->suspended) |
| 1730 | pullup(udc, 0); |
| 1731 | return 0; |
| 1732 | } |
| 1733 | |
David Brownell | 68ba61b | 2006-04-02 20:26:21 -0800 | [diff] [blame] | 1734 | static int at91udc_resume(struct platform_device *dev) |
David Brownell | bae4bd8 | 2006-01-22 10:32:37 -0800 | [diff] [blame] | 1735 | { |
| 1736 | struct at91_udc *udc = platform_get_drvdata(dev); |
| 1737 | |
| 1738 | /* maybe reconnect to host; if so, clocks on */ |
| 1739 | pullup(udc, 1); |
| 1740 | return 0; |
| 1741 | } |
| 1742 | #else |
| 1743 | #define at91udc_suspend NULL |
| 1744 | #define at91udc_resume NULL |
| 1745 | #endif |
| 1746 | |
| 1747 | static struct platform_driver at91_udc = { |
| 1748 | .probe = at91udc_probe, |
| 1749 | .remove = __devexit_p(at91udc_remove), |
| 1750 | .shutdown = at91udc_shutdown, |
| 1751 | .suspend = at91udc_suspend, |
| 1752 | .resume = at91udc_resume, |
| 1753 | .driver = { |
| 1754 | .name = (char *) driver_name, |
| 1755 | .owner = THIS_MODULE, |
| 1756 | }, |
| 1757 | }; |
| 1758 | |
| 1759 | static int __devinit udc_init_module(void) |
| 1760 | { |
| 1761 | return platform_driver_register(&at91_udc); |
| 1762 | } |
| 1763 | module_init(udc_init_module); |
| 1764 | |
| 1765 | static void __devexit udc_exit_module(void) |
| 1766 | { |
| 1767 | platform_driver_unregister(&at91_udc); |
| 1768 | } |
| 1769 | module_exit(udc_exit_module); |
| 1770 | |
| 1771 | MODULE_DESCRIPTION("AT91RM9200 udc driver"); |
| 1772 | MODULE_AUTHOR("Thomas Rathbone, David Brownell"); |
| 1773 | MODULE_LICENSE("GPL"); |