1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Intel PXA25x and IXP4xx on-chip full speed USB device controllers 4 * 5 * Copyright (C) 2002 Intrinsyc, Inc. (Frank Becker) 6 * Copyright (C) 2003 Robert Schwebel, Pengutronix 7 * Copyright (C) 2003 Benedikt Spranger, Pengutronix 8 * Copyright (C) 2003 David Brownell 9 * Copyright (C) 2003 Joshua Wise 10 */ 11 12/* #define VERBOSE_DEBUG */ 13 14#include <linux/device.h> 15#include <linux/gpio.h> 16#include <linux/module.h> 17#include <linux/kernel.h> 18#include <linux/ioport.h> 19#include <linux/types.h> 20#include <linux/errno.h> 21#include <linux/err.h> 22#include <linux/delay.h> 23#include <linux/slab.h> 24#include <linux/timer.h> 25#include <linux/list.h> 26#include <linux/interrupt.h> 27#include <linux/mm.h> 28#include <linux/platform_data/pxa2xx_udc.h> 29#include <linux/platform_device.h> 30#include <linux/dma-mapping.h> 31#include <linux/irq.h> 32#include <linux/clk.h> 33#include <linux/seq_file.h> 34#include <linux/debugfs.h> 35#include <linux/io.h> 36#include <linux/prefetch.h> 37 38#include <asm/byteorder.h> 39#include <asm/dma.h> 40#include <asm/mach-types.h> 41#include <asm/unaligned.h> 42 43#include <linux/usb/ch9.h> 44#include <linux/usb/gadget.h> 45#include <linux/usb/otg.h> 46 47#define UDCCR 0x0000 /* UDC Control Register */ 48#define UDC_RES1 0x0004 /* UDC Undocumented - Reserved1 */ 49#define UDC_RES2 0x0008 /* UDC Undocumented - Reserved2 */ 50#define UDC_RES3 0x000C /* UDC Undocumented - Reserved3 */ 51#define UDCCS0 0x0010 /* UDC Endpoint 0 Control/Status Register */ 52#define UDCCS1 0x0014 /* UDC Endpoint 1 (IN) Control/Status Register */ 53#define UDCCS2 0x0018 /* UDC Endpoint 2 (OUT) Control/Status Register */ 54#define UDCCS3 0x001C /* UDC Endpoint 3 (IN) Control/Status Register */ 55#define UDCCS4 0x0020 /* UDC Endpoint 4 (OUT) Control/Status Register */ 56#define UDCCS5 0x0024 /* UDC Endpoint 5 (Interrupt) Control/Status Register */ 57#define UDCCS6 0x0028 /* UDC Endpoint 6 (IN) Control/Status Register */ 58#define UDCCS7 0x002C /* UDC Endpoint 7 (OUT) Control/Status Register */ 59#define UDCCS8 0x0030 /* UDC Endpoint 8 (IN) Control/Status Register */ 60#define UDCCS9 0x0034 /* UDC Endpoint 9 (OUT) Control/Status Register */ 61#define UDCCS10 0x0038 /* UDC Endpoint 10 (Interrupt) Control/Status Register */ 62#define UDCCS11 0x003C /* UDC Endpoint 11 (IN) Control/Status Register */ 63#define UDCCS12 0x0040 /* UDC Endpoint 12 (OUT) Control/Status Register */ 64#define UDCCS13 0x0044 /* UDC Endpoint 13 (IN) Control/Status Register */ 65#define UDCCS14 0x0048 /* UDC Endpoint 14 (OUT) Control/Status Register */ 66#define UDCCS15 0x004C /* UDC Endpoint 15 (Interrupt) Control/Status Register */ 67#define UFNRH 0x0060 /* UDC Frame Number Register High */ 68#define UFNRL 0x0064 /* UDC Frame Number Register Low */ 69#define UBCR2 0x0068 /* UDC Byte Count Reg 2 */ 70#define UBCR4 0x006c /* UDC Byte Count Reg 4 */ 71#define UBCR7 0x0070 /* UDC Byte Count Reg 7 */ 72#define UBCR9 0x0074 /* UDC Byte Count Reg 9 */ 73#define UBCR12 0x0078 /* UDC Byte Count Reg 12 */ 74#define UBCR14 0x007c /* UDC Byte Count Reg 14 */ 75#define UDDR0 0x0080 /* UDC Endpoint 0 Data Register */ 76#define UDDR1 0x0100 /* UDC Endpoint 1 Data Register */ 77#define UDDR2 0x0180 /* UDC Endpoint 2 Data Register */ 78#define UDDR3 0x0200 /* UDC Endpoint 3 Data Register */ 79#define UDDR4 0x0400 /* UDC Endpoint 4 Data Register */ 80#define UDDR5 0x00A0 /* UDC Endpoint 5 Data Register */ 81#define UDDR6 0x0600 /* UDC Endpoint 6 Data Register */ 82#define UDDR7 0x0680 /* UDC Endpoint 7 Data Register */ 83#define UDDR8 0x0700 /* UDC Endpoint 8 Data Register */ 84#define UDDR9 0x0900 /* UDC Endpoint 9 Data Register */ 85#define UDDR10 0x00C0 /* UDC Endpoint 10 Data Register */ 86#define UDDR11 0x0B00 /* UDC Endpoint 11 Data Register */ 87#define UDDR12 0x0B80 /* UDC Endpoint 12 Data Register */ 88#define UDDR13 0x0C00 /* UDC Endpoint 13 Data Register */ 89#define UDDR14 0x0E00 /* UDC Endpoint 14 Data Register */ 90#define UDDR15 0x00E0 /* UDC Endpoint 15 Data Register */ 91 92#define UICR0 0x0050 /* UDC Interrupt Control Register 0 */ 93#define UICR1 0x0054 /* UDC Interrupt Control Register 1 */ 94 95#define USIR0 0x0058 /* UDC Status Interrupt Register 0 */ 96#define USIR1 0x005C /* UDC Status Interrupt Register 1 */ 97 98#define UDCCR_UDE (1 << 0) /* UDC enable */ 99#define UDCCR_UDA (1 << 1) /* UDC active */ 100#define UDCCR_RSM (1 << 2) /* Device resume */ 101#define UDCCR_RESIR (1 << 3) /* Resume interrupt request */ 102#define UDCCR_SUSIR (1 << 4) /* Suspend interrupt request */ 103#define UDCCR_SRM (1 << 5) /* Suspend/resume interrupt mask */ 104#define UDCCR_RSTIR (1 << 6) /* Reset interrupt request */ 105#define UDCCR_REM (1 << 7) /* Reset interrupt mask */ 106 107#define UDCCS0_OPR (1 << 0) /* OUT packet ready */ 108#define UDCCS0_IPR (1 << 1) /* IN packet ready */ 109#define UDCCS0_FTF (1 << 2) /* Flush Tx FIFO */ 110#define UDCCS0_DRWF (1 << 3) /* Device remote wakeup feature */ 111#define UDCCS0_SST (1 << 4) /* Sent stall */ 112#define UDCCS0_FST (1 << 5) /* Force stall */ 113#define UDCCS0_RNE (1 << 6) /* Receive FIFO no empty */ 114#define UDCCS0_SA (1 << 7) /* Setup active */ 115 116#define UDCCS_BI_TFS (1 << 0) /* Transmit FIFO service */ 117#define UDCCS_BI_TPC (1 << 1) /* Transmit packet complete */ 118#define UDCCS_BI_FTF (1 << 2) /* Flush Tx FIFO */ 119#define UDCCS_BI_TUR (1 << 3) /* Transmit FIFO underrun */ 120#define UDCCS_BI_SST (1 << 4) /* Sent stall */ 121#define UDCCS_BI_FST (1 << 5) /* Force stall */ 122#define UDCCS_BI_TSP (1 << 7) /* Transmit short packet */ 123 124#define UDCCS_BO_RFS (1 << 0) /* Receive FIFO service */ 125#define UDCCS_BO_RPC (1 << 1) /* Receive packet complete */ 126#define UDCCS_BO_DME (1 << 3) /* DMA enable */ 127#define UDCCS_BO_SST (1 << 4) /* Sent stall */ 128#define UDCCS_BO_FST (1 << 5) /* Force stall */ 129#define UDCCS_BO_RNE (1 << 6) /* Receive FIFO not empty */ 130#define UDCCS_BO_RSP (1 << 7) /* Receive short packet */ 131 132#define UDCCS_II_TFS (1 << 0) /* Transmit FIFO service */ 133#define UDCCS_II_TPC (1 << 1) /* Transmit packet complete */ 134#define UDCCS_II_FTF (1 << 2) /* Flush Tx FIFO */ 135#define UDCCS_II_TUR (1 << 3) /* Transmit FIFO underrun */ 136#define UDCCS_II_TSP (1 << 7) /* Transmit short packet */ 137 138#define UDCCS_IO_RFS (1 << 0) /* Receive FIFO service */ 139#define UDCCS_IO_RPC (1 << 1) /* Receive packet complete */ 140#ifdef CONFIG_ARCH_IXP4XX /* FIXME: is this right?, datasheed says '2' */ 141#define UDCCS_IO_ROF (1 << 3) /* Receive overflow */ 142#endif 143#ifdef CONFIG_ARCH_PXA 144#define UDCCS_IO_ROF (1 << 2) /* Receive overflow */ 145#endif 146#define UDCCS_IO_DME (1 << 3) /* DMA enable */ 147#define UDCCS_IO_RNE (1 << 6) /* Receive FIFO not empty */ 148#define UDCCS_IO_RSP (1 << 7) /* Receive short packet */ 149 150#define UDCCS_INT_TFS (1 << 0) /* Transmit FIFO service */ 151#define UDCCS_INT_TPC (1 << 1) /* Transmit packet complete */ 152#define UDCCS_INT_FTF (1 << 2) /* Flush Tx FIFO */ 153#define UDCCS_INT_TUR (1 << 3) /* Transmit FIFO underrun */ 154#define UDCCS_INT_SST (1 << 4) /* Sent stall */ 155#define UDCCS_INT_FST (1 << 5) /* Force stall */ 156#define UDCCS_INT_TSP (1 << 7) /* Transmit short packet */ 157 158#define UICR0_IM0 (1 << 0) /* Interrupt mask ep 0 */ 159#define UICR0_IM1 (1 << 1) /* Interrupt mask ep 1 */ 160#define UICR0_IM2 (1 << 2) /* Interrupt mask ep 2 */ 161#define UICR0_IM3 (1 << 3) /* Interrupt mask ep 3 */ 162#define UICR0_IM4 (1 << 4) /* Interrupt mask ep 4 */ 163#define UICR0_IM5 (1 << 5) /* Interrupt mask ep 5 */ 164#define UICR0_IM6 (1 << 6) /* Interrupt mask ep 6 */ 165#define UICR0_IM7 (1 << 7) /* Interrupt mask ep 7 */ 166 167#define UICR1_IM8 (1 << 0) /* Interrupt mask ep 8 */ 168#define UICR1_IM9 (1 << 1) /* Interrupt mask ep 9 */ 169#define UICR1_IM10 (1 << 2) /* Interrupt mask ep 10 */ 170#define UICR1_IM11 (1 << 3) /* Interrupt mask ep 11 */ 171#define UICR1_IM12 (1 << 4) /* Interrupt mask ep 12 */ 172#define UICR1_IM13 (1 << 5) /* Interrupt mask ep 13 */ 173#define UICR1_IM14 (1 << 6) /* Interrupt mask ep 14 */ 174#define UICR1_IM15 (1 << 7) /* Interrupt mask ep 15 */ 175 176#define USIR0_IR0 (1 << 0) /* Interrupt request ep 0 */ 177#define USIR0_IR1 (1 << 1) /* Interrupt request ep 1 */ 178#define USIR0_IR2 (1 << 2) /* Interrupt request ep 2 */ 179#define USIR0_IR3 (1 << 3) /* Interrupt request ep 3 */ 180#define USIR0_IR4 (1 << 4) /* Interrupt request ep 4 */ 181#define USIR0_IR5 (1 << 5) /* Interrupt request ep 5 */ 182#define USIR0_IR6 (1 << 6) /* Interrupt request ep 6 */ 183#define USIR0_IR7 (1 << 7) /* Interrupt request ep 7 */ 184 185#define USIR1_IR8 (1 << 0) /* Interrupt request ep 8 */ 186#define USIR1_IR9 (1 << 1) /* Interrupt request ep 9 */ 187#define USIR1_IR10 (1 << 2) /* Interrupt request ep 10 */ 188#define USIR1_IR11 (1 << 3) /* Interrupt request ep 11 */ 189#define USIR1_IR12 (1 << 4) /* Interrupt request ep 12 */ 190#define USIR1_IR13 (1 << 5) /* Interrupt request ep 13 */ 191#define USIR1_IR14 (1 << 6) /* Interrupt request ep 14 */ 192#define USIR1_IR15 (1 << 7) /* Interrupt request ep 15 */ 193 194/* 195 * This driver handles the USB Device Controller (UDC) in Intel's PXA 25x 196 * series processors. The UDC for the IXP 4xx series is very similar. 197 * There are fifteen endpoints, in addition to ep0. 198 * 199 * Such controller drivers work with a gadget driver. The gadget driver 200 * returns descriptors, implements configuration and data protocols used 201 * by the host to interact with this device, and allocates endpoints to 202 * the different protocol interfaces. The controller driver virtualizes 203 * usb hardware so that the gadget drivers will be more portable. 204 * 205 * This UDC hardware wants to implement a bit too much USB protocol, so 206 * it constrains the sorts of USB configuration change events that work. 207 * The errata for these chips are misleading; some "fixed" bugs from 208 * pxa250 a0/a1 b0/b1/b2 sure act like they're still there. 209 * 210 * Note that the UDC hardware supports DMA (except on IXP) but that's 211 * not used here. IN-DMA (to host) is simple enough, when the data is 212 * suitably aligned (16 bytes) ... the network stack doesn't do that, 213 * other software can. OUT-DMA is buggy in most chip versions, as well 214 * as poorly designed (data toggle not automatic). So this driver won't 215 * bother using DMA. (Mostly-working IN-DMA support was available in 216 * kernels before 2.6.23, but was never enabled or well tested.) 217 */ 218 219#define DRIVER_VERSION "30-June-2007" 220#define DRIVER_DESC "PXA 25x USB Device Controller driver" 221 222 223static const char driver_name [] = "pxa25x_udc"; 224 225static const char ep0name [] = "ep0"; 226 227 228#ifdef CONFIG_ARCH_IXP4XX 229 230/* cpu-specific register addresses are compiled in to this code */ 231#ifdef CONFIG_ARCH_PXA 232#error "Can't configure both IXP and PXA" 233#endif 234 235/* IXP doesn't yet support <linux/clk.h> */ 236#define clk_get(dev,name) NULL 237#define clk_enable(clk) do { } while (0) 238#define clk_disable(clk) do { } while (0) 239#define clk_put(clk) do { } while (0) 240 241#endif 242 243#include "pxa25x_udc.h" 244 245 246#ifdef CONFIG_USB_PXA25X_SMALL 247#define SIZE_STR " (small)" 248#else 249#define SIZE_STR "" 250#endif 251 252/* --------------------------------------------------------------------------- 253 * endpoint related parts of the api to the usb controller hardware, 254 * used by gadget driver; and the inner talker-to-hardware core. 255 * --------------------------------------------------------------------------- 256 */ 257 258static void pxa25x_ep_fifo_flush (struct usb_ep *ep); 259static void nuke (struct pxa25x_ep *, int status); 260 261/* one GPIO should control a D+ pullup, so host sees this device (or not) */ 262static void pullup_off(void) 263{ 264 struct pxa2xx_udc_mach_info *mach = the_controller->mach; 265 int off_level = mach->gpio_pullup_inverted; 266 267 if (gpio_is_valid(mach->gpio_pullup)) 268 gpio_set_value(mach->gpio_pullup, off_level); 269 else if (mach->udc_command) 270 mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT); 271} 272 273static void pullup_on(void) 274{ 275 struct pxa2xx_udc_mach_info *mach = the_controller->mach; 276 int on_level = !mach->gpio_pullup_inverted; 277 278 if (gpio_is_valid(mach->gpio_pullup)) 279 gpio_set_value(mach->gpio_pullup, on_level); 280 else if (mach->udc_command) 281 mach->udc_command(PXA2XX_UDC_CMD_CONNECT); 282} 283 284#if defined(CONFIG_CPU_BIG_ENDIAN) 285/* 286 * IXP4xx has its buses wired up in a way that relies on never doing any 287 * byte swaps, independent of whether it runs in big-endian or little-endian 288 * mode, as explained by Krzysztof Ha��asa. 289 * 290 * We only support pxa25x in little-endian mode, but it is very likely 291 * that it works the same way. 292 */ 293static inline void udc_set_reg(struct pxa25x_udc *dev, u32 reg, u32 val) 294{ 295 iowrite32be(val, dev->regs + reg); 296} 297 298static inline u32 udc_get_reg(struct pxa25x_udc *dev, u32 reg) 299{ 300 return ioread32be(dev->regs + reg); 301} 302#else 303static inline void udc_set_reg(struct pxa25x_udc *dev, u32 reg, u32 val) 304{ 305 writel(val, dev->regs + reg); 306} 307 308static inline u32 udc_get_reg(struct pxa25x_udc *dev, u32 reg) 309{ 310 return readl(dev->regs + reg); 311} 312#endif 313 314static void pio_irq_enable(struct pxa25x_ep *ep) 315{ 316 u32 bEndpointAddress = ep->bEndpointAddress & 0xf; 317 318 if (bEndpointAddress < 8) 319 udc_set_reg(ep->dev, UICR0, udc_get_reg(ep->dev, UICR0) & 320 ~(1 << bEndpointAddress)); 321 else { 322 bEndpointAddress -= 8; 323 udc_set_reg(ep->dev, UICR1, udc_get_reg(ep->dev, UICR1) & 324 ~(1 << bEndpointAddress)); 325 } 326} 327 328static void pio_irq_disable(struct pxa25x_ep *ep) 329{ 330 u32 bEndpointAddress = ep->bEndpointAddress & 0xf; 331 332 if (bEndpointAddress < 8) 333 udc_set_reg(ep->dev, UICR0, udc_get_reg(ep->dev, UICR0) | 334 (1 << bEndpointAddress)); 335 else { 336 bEndpointAddress -= 8; 337 udc_set_reg(ep->dev, UICR1, udc_get_reg(ep->dev, UICR1) | 338 (1 << bEndpointAddress)); 339 } 340} 341 342/* The UDCCR reg contains mask and interrupt status bits, 343 * so using '|=' isn't safe as it may ack an interrupt. 344 */ 345#define UDCCR_MASK_BITS (UDCCR_REM | UDCCR_SRM | UDCCR_UDE) 346 347static inline void udc_set_mask_UDCCR(struct pxa25x_udc *dev, int mask) 348{ 349 u32 udccr = udc_get_reg(dev, UDCCR); 350 351 udc_set_reg(dev, (udccr & UDCCR_MASK_BITS) | (mask & UDCCR_MASK_BITS), UDCCR); 352} 353 354static inline void udc_clear_mask_UDCCR(struct pxa25x_udc *dev, int mask) 355{ 356 u32 udccr = udc_get_reg(dev, UDCCR); 357 358 udc_set_reg(dev, (udccr & UDCCR_MASK_BITS) & ~(mask & UDCCR_MASK_BITS), UDCCR); 359} 360 361static inline void udc_ack_int_UDCCR(struct pxa25x_udc *dev, int mask) 362{ 363 /* udccr contains the bits we dont want to change */ 364 u32 udccr = udc_get_reg(dev, UDCCR) & UDCCR_MASK_BITS; 365 366 udc_set_reg(dev, udccr | (mask & ~UDCCR_MASK_BITS), UDCCR); 367} 368 369static inline u32 udc_ep_get_UDCCS(struct pxa25x_ep *ep) 370{ 371 return udc_get_reg(ep->dev, ep->regoff_udccs); 372} 373 374static inline void udc_ep_set_UDCCS(struct pxa25x_ep *ep, u32 data) 375{ 376 udc_set_reg(ep->dev, data, ep->regoff_udccs); 377} 378 379static inline u32 udc_ep0_get_UDCCS(struct pxa25x_udc *dev) 380{ 381 return udc_get_reg(dev, UDCCS0); 382} 383 384static inline void udc_ep0_set_UDCCS(struct pxa25x_udc *dev, u32 data) 385{ 386 udc_set_reg(dev, data, UDCCS0); 387} 388 389static inline u32 udc_ep_get_UDDR(struct pxa25x_ep *ep) 390{ 391 return udc_get_reg(ep->dev, ep->regoff_uddr); 392} 393 394static inline void udc_ep_set_UDDR(struct pxa25x_ep *ep, u32 data) 395{ 396 udc_set_reg(ep->dev, data, ep->regoff_uddr); 397} 398 399static inline u32 udc_ep_get_UBCR(struct pxa25x_ep *ep) 400{ 401 return udc_get_reg(ep->dev, ep->regoff_ubcr); 402} 403 404/* 405 * endpoint enable/disable 406 * 407 * we need to verify the descriptors used to enable endpoints. since pxa25x 408 * endpoint configurations are fixed, and are pretty much always enabled, 409 * there's not a lot to manage here. 410 * 411 * because pxa25x can't selectively initialize bulk (or interrupt) endpoints, 412 * (resetting endpoint halt and toggle), SET_INTERFACE is unusable except 413 * for a single interface (with only the default altsetting) and for gadget 414 * drivers that don't halt endpoints (not reset by set_interface). that also 415 * means that if you use ISO, you must violate the USB spec rule that all 416 * iso endpoints must be in non-default altsettings. 417 */ 418static int pxa25x_ep_enable (struct usb_ep *_ep, 419 const struct usb_endpoint_descriptor *desc) 420{ 421 struct pxa25x_ep *ep; 422 struct pxa25x_udc *dev; 423 424 ep = container_of (_ep, struct pxa25x_ep, ep); 425 if (!_ep || !desc || _ep->name == ep0name 426 || desc->bDescriptorType != USB_DT_ENDPOINT 427 || ep->bEndpointAddress != desc->bEndpointAddress 428 || ep->fifo_size < usb_endpoint_maxp (desc)) { 429 DMSG("%s, bad ep or descriptor\n", __func__); 430 return -EINVAL; 431 } 432 433 /* xfer types must match, except that interrupt ~= bulk */ 434 if (ep->bmAttributes != desc->bmAttributes 435 && ep->bmAttributes != USB_ENDPOINT_XFER_BULK 436 && desc->bmAttributes != USB_ENDPOINT_XFER_INT) { 437 DMSG("%s, %s type mismatch\n", __func__, _ep->name); 438 return -EINVAL; 439 } 440 441 /* hardware _could_ do smaller, but driver doesn't */ 442 if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK 443 && usb_endpoint_maxp (desc) 444 != BULK_FIFO_SIZE) 445 || !desc->wMaxPacketSize) { 446 DMSG("%s, bad %s maxpacket\n", __func__, _ep->name); 447 return -ERANGE; 448 } 449 450 dev = ep->dev; 451 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) { 452 DMSG("%s, bogus device state\n", __func__); 453 return -ESHUTDOWN; 454 } 455 456 ep->ep.desc = desc; 457 ep->stopped = 0; 458 ep->pio_irqs = 0; 459 ep->ep.maxpacket = usb_endpoint_maxp (desc); 460 461 /* flush fifo (mostly for OUT buffers) */ 462 pxa25x_ep_fifo_flush (_ep); 463 464 /* ... reset halt state too, if we could ... */ 465 466 DBG(DBG_VERBOSE, "enabled %s\n", _ep->name); 467 return 0; 468} 469 470static int pxa25x_ep_disable (struct usb_ep *_ep) 471{ 472 struct pxa25x_ep *ep; 473 unsigned long flags; 474 475 ep = container_of (_ep, struct pxa25x_ep, ep); 476 if (!_ep || !ep->ep.desc) { 477 DMSG("%s, %s not enabled\n", __func__, 478 _ep ? ep->ep.name : NULL); 479 return -EINVAL; 480 } 481 local_irq_save(flags); 482 483 nuke (ep, -ESHUTDOWN); 484 485 /* flush fifo (mostly for IN buffers) */ 486 pxa25x_ep_fifo_flush (_ep); 487 488 ep->ep.desc = NULL; 489 ep->stopped = 1; 490 491 local_irq_restore(flags); 492 DBG(DBG_VERBOSE, "%s disabled\n", _ep->name); 493 return 0; 494} 495 496/*-------------------------------------------------------------------------*/ 497 498/* for the pxa25x, these can just wrap kmalloc/kfree. gadget drivers 499 * must still pass correctly initialized endpoints, since other controller 500 * drivers may care about how it's currently set up (dma issues etc). 501 */ 502 503/* 504 * pxa25x_ep_alloc_request - allocate a request data structure 505 */ 506static struct usb_request * 507pxa25x_ep_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags) 508{ 509 struct pxa25x_request *req; 510 511 req = kzalloc(sizeof(*req), gfp_flags); 512 if (!req) 513 return NULL; 514 515 INIT_LIST_HEAD (&req->queue); 516 return &req->req; 517} 518 519 520/* 521 * pxa25x_ep_free_request - deallocate a request data structure 522 */ 523static void 524pxa25x_ep_free_request (struct usb_ep *_ep, struct usb_request *_req) 525{ 526 struct pxa25x_request *req; 527 528 req = container_of (_req, struct pxa25x_request, req); 529 WARN_ON(!list_empty (&req->queue)); 530 kfree(req); 531} 532 533/*-------------------------------------------------------------------------*/ 534 535/* 536 * done - retire a request; caller blocked irqs 537 */ 538static void done(struct pxa25x_ep *ep, struct pxa25x_request *req, int status) 539{ 540 unsigned stopped = ep->stopped; 541 542 list_del_init(&req->queue); 543 544 if (likely (req->req.status == -EINPROGRESS)) 545 req->req.status = status; 546 else 547 status = req->req.status; 548 549 if (status && status != -ESHUTDOWN) 550 DBG(DBG_VERBOSE, "complete %s req %p stat %d len %u/%u\n", 551 ep->ep.name, &req->req, status, 552 req->req.actual, req->req.length); 553 554 /* don't modify queue heads during completion callback */ 555 ep->stopped = 1; 556 usb_gadget_giveback_request(&ep->ep, &req->req); 557 ep->stopped = stopped; 558} 559 560 561static inline void ep0_idle (struct pxa25x_udc *dev) 562{ 563 dev->ep0state = EP0_IDLE; 564} 565 566static int 567write_packet(struct pxa25x_ep *ep, struct pxa25x_request *req, unsigned max) 568{ 569 u8 *buf; 570 unsigned length, count; 571 572 buf = req->req.buf + req->req.actual; 573 prefetch(buf); 574 575 /* how big will this packet be? */ 576 length = min(req->req.length - req->req.actual, max); 577 req->req.actual += length; 578 579 count = length; 580 while (likely(count--)) 581 udc_ep_set_UDDR(ep, *buf++); 582 583 return length; 584} 585 586/* 587 * write to an IN endpoint fifo, as many packets as possible. 588 * irqs will use this to write the rest later. 589 * caller guarantees at least one packet buffer is ready (or a zlp). 590 */ 591static int 592write_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req) 593{ 594 unsigned max; 595 596 max = usb_endpoint_maxp(ep->ep.desc); 597 do { 598 unsigned count; 599 int is_last, is_short; 600 601 count = write_packet(ep, req, max); 602 603 /* last packet is usually short (or a zlp) */ 604 if (unlikely (count != max)) 605 is_last = is_short = 1; 606 else { 607 if (likely(req->req.length != req->req.actual) 608 || req->req.zero) 609 is_last = 0; 610 else 611 is_last = 1; 612 /* interrupt/iso maxpacket may not fill the fifo */ 613 is_short = unlikely (max < ep->fifo_size); 614 } 615 616 DBG(DBG_VERY_NOISY, "wrote %s %d bytes%s%s %d left %p\n", 617 ep->ep.name, count, 618 is_last ? "/L" : "", is_short ? "/S" : "", 619 req->req.length - req->req.actual, req); 620 621 /* let loose that packet. maybe try writing another one, 622 * double buffering might work. TSP, TPC, and TFS 623 * bit values are the same for all normal IN endpoints. 624 */ 625 udc_ep_set_UDCCS(ep, UDCCS_BI_TPC); 626 if (is_short) 627 udc_ep_set_UDCCS(ep, UDCCS_BI_TSP); 628 629 /* requests complete when all IN data is in the FIFO */ 630 if (is_last) { 631 done (ep, req, 0); 632 if (list_empty(&ep->queue)) 633 pio_irq_disable(ep); 634 return 1; 635 } 636 637 // TODO experiment: how robust can fifo mode tweaking be? 638 // double buffering is off in the default fifo mode, which 639 // prevents TFS from being set here. 640 641 } while (udc_ep_get_UDCCS(ep) & UDCCS_BI_TFS); 642 return 0; 643} 644 645/* caller asserts req->pending (ep0 irq status nyet cleared); starts 646 * ep0 data stage. these chips want very simple state transitions. 647 */ 648static inline 649void ep0start(struct pxa25x_udc *dev, u32 flags, const char *tag) 650{ 651 udc_ep0_set_UDCCS(dev, flags|UDCCS0_SA|UDCCS0_OPR); 652 udc_set_reg(dev, USIR0, USIR0_IR0); 653 dev->req_pending = 0; 654 DBG(DBG_VERY_NOISY, "%s %s, %02x/%02x\n", 655 __func__, tag, udc_ep0_get_UDCCS(dev), flags); 656} 657 658static int 659write_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req) 660{ 661 struct pxa25x_udc *dev = ep->dev; 662 unsigned count; 663 int is_short; 664 665 count = write_packet(&dev->ep[0], req, EP0_FIFO_SIZE); 666 ep->dev->stats.write.bytes += count; 667 668 /* last packet "must be" short (or a zlp) */ 669 is_short = (count != EP0_FIFO_SIZE); 670 671 DBG(DBG_VERY_NOISY, "ep0in %d bytes %d left %p\n", count, 672 req->req.length - req->req.actual, req); 673 674 if (unlikely (is_short)) { 675 if (ep->dev->req_pending) 676 ep0start(ep->dev, UDCCS0_IPR, "short IN"); 677 else 678 udc_ep0_set_UDCCS(dev, UDCCS0_IPR); 679 680 count = req->req.length; 681 done (ep, req, 0); 682 ep0_idle(ep->dev); 683#ifndef CONFIG_ARCH_IXP4XX 684#if 1 685 /* This seems to get rid of lost status irqs in some cases: 686 * host responds quickly, or next request involves config 687 * change automagic, or should have been hidden, or ... 688 * 689 * FIXME get rid of all udelays possible... 690 */ 691 if (count >= EP0_FIFO_SIZE) { 692 count = 100; 693 do { 694 if ((udc_ep0_get_UDCCS(dev) & UDCCS0_OPR) != 0) { 695 /* clear OPR, generate ack */ 696 udc_ep0_set_UDCCS(dev, UDCCS0_OPR); 697 break; 698 } 699 count--; 700 udelay(1); 701 } while (count); 702 } 703#endif 704#endif 705 } else if (ep->dev->req_pending) 706 ep0start(ep->dev, 0, "IN"); 707 return is_short; 708} 709 710 711/* 712 * read_fifo - unload packet(s) from the fifo we use for usb OUT 713 * transfers and put them into the request. caller should have made 714 * sure there's at least one packet ready. 715 * 716 * returns true if the request completed because of short packet or the 717 * request buffer having filled (and maybe overran till end-of-packet). 718 */ 719static int 720read_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req) 721{ 722 for (;;) { 723 u32 udccs; 724 u8 *buf; 725 unsigned bufferspace, count, is_short; 726 727 /* make sure there's a packet in the FIFO. 728 * UDCCS_{BO,IO}_RPC are all the same bit value. 729 * UDCCS_{BO,IO}_RNE are all the same bit value. 730 */ 731 udccs = udc_ep_get_UDCCS(ep); 732 if (unlikely ((udccs & UDCCS_BO_RPC) == 0)) 733 break; 734 buf = req->req.buf + req->req.actual; 735 prefetchw(buf); 736 bufferspace = req->req.length - req->req.actual; 737 738 /* read all bytes from this packet */ 739 if (likely (udccs & UDCCS_BO_RNE)) { 740 count = 1 + (0x0ff & udc_ep_get_UBCR(ep)); 741 req->req.actual += min (count, bufferspace); 742 } else /* zlp */ 743 count = 0; 744 is_short = (count < ep->ep.maxpacket); 745 DBG(DBG_VERY_NOISY, "read %s %02x, %d bytes%s req %p %d/%d\n", 746 ep->ep.name, udccs, count, 747 is_short ? "/S" : "", 748 req, req->req.actual, req->req.length); 749 while (likely (count-- != 0)) { 750 u8 byte = (u8) udc_ep_get_UDDR(ep); 751 752 if (unlikely (bufferspace == 0)) { 753 /* this happens when the driver's buffer 754 * is smaller than what the host sent. 755 * discard the extra data. 756 */ 757 if (req->req.status != -EOVERFLOW) 758 DMSG("%s overflow %d\n", 759 ep->ep.name, count); 760 req->req.status = -EOVERFLOW; 761 } else { 762 *buf++ = byte; 763 bufferspace--; 764 } 765 } 766 udc_ep_set_UDCCS(ep, UDCCS_BO_RPC); 767 /* RPC/RSP/RNE could now reflect the other packet buffer */ 768 769 /* iso is one request per packet */ 770 if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) { 771 if (udccs & UDCCS_IO_ROF) 772 req->req.status = -EHOSTUNREACH; 773 /* more like "is_done" */ 774 is_short = 1; 775 } 776 777 /* completion */ 778 if (is_short || req->req.actual == req->req.length) { 779 done (ep, req, 0); 780 if (list_empty(&ep->queue)) 781 pio_irq_disable(ep); 782 return 1; 783 } 784 785 /* finished that packet. the next one may be waiting... */ 786 } 787 return 0; 788} 789 790/* 791 * special ep0 version of the above. no UBCR0 or double buffering; status 792 * handshaking is magic. most device protocols don't need control-OUT. 793 * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other 794 * protocols do use them. 795 */ 796static int 797read_ep0_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req) 798{ 799 u8 *buf, byte; 800 unsigned bufferspace; 801 802 buf = req->req.buf + req->req.actual; 803 bufferspace = req->req.length - req->req.actual; 804 805 while (udc_ep_get_UDCCS(ep) & UDCCS0_RNE) { 806 byte = (u8) UDDR0; 807 808 if (unlikely (bufferspace == 0)) { 809 /* this happens when the driver's buffer 810 * is smaller than what the host sent. 811 * discard the extra data. 812 */ 813 if (req->req.status != -EOVERFLOW) 814 DMSG("%s overflow\n", ep->ep.name); 815 req->req.status = -EOVERFLOW; 816 } else { 817 *buf++ = byte; 818 req->req.actual++; 819 bufferspace--; 820 } 821 } 822 823 udc_ep_set_UDCCS(ep, UDCCS0_OPR | UDCCS0_IPR); 824 825 /* completion */ 826 if (req->req.actual >= req->req.length) 827 return 1; 828 829 /* finished that packet. the next one may be waiting... */ 830 return 0; 831} 832 833/*-------------------------------------------------------------------------*/ 834 835static int 836pxa25x_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) 837{ 838 struct pxa25x_request *req; 839 struct pxa25x_ep *ep; 840 struct pxa25x_udc *dev; 841 unsigned long flags; 842 843 req = container_of(_req, struct pxa25x_request, req); 844 if (unlikely (!_req || !_req->complete || !_req->buf 845 || !list_empty(&req->queue))) { 846 DMSG("%s, bad params\n", __func__); 847 return -EINVAL; 848 } 849 850 ep = container_of(_ep, struct pxa25x_ep, ep); 851 if (unlikely(!_ep || (!ep->ep.desc && ep->ep.name != ep0name))) { 852 DMSG("%s, bad ep\n", __func__); 853 return -EINVAL; 854 } 855 856 dev = ep->dev; 857 if (unlikely (!dev->driver 858 || dev->gadget.speed == USB_SPEED_UNKNOWN)) { 859 DMSG("%s, bogus device state\n", __func__); 860 return -ESHUTDOWN; 861 } 862 863 /* iso is always one packet per request, that's the only way 864 * we can report per-packet status. that also helps with dma. 865 */ 866 if (unlikely (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC 867 && req->req.length > usb_endpoint_maxp(ep->ep.desc))) 868 return -EMSGSIZE; 869 870 DBG(DBG_NOISY, "%s queue req %p, len %d buf %p\n", 871 _ep->name, _req, _req->length, _req->buf); 872 873 local_irq_save(flags); 874 875 _req->status = -EINPROGRESS; 876 _req->actual = 0; 877 878 /* kickstart this i/o queue? */ 879 if (list_empty(&ep->queue) && !ep->stopped) { 880 if (ep->ep.desc == NULL/* ep0 */) { 881 unsigned length = _req->length; 882 883 switch (dev->ep0state) { 884 case EP0_IN_DATA_PHASE: 885 dev->stats.write.ops++; 886 if (write_ep0_fifo(ep, req)) 887 req = NULL; 888 break; 889 890 case EP0_OUT_DATA_PHASE: 891 dev->stats.read.ops++; 892 /* messy ... */ 893 if (dev->req_config) { 894 DBG(DBG_VERBOSE, "ep0 config ack%s\n", 895 dev->has_cfr ? "" : " raced"); 896 if (dev->has_cfr) 897 udc_set_reg(dev, UDCCFR, UDCCFR_AREN | 898 UDCCFR_ACM | UDCCFR_MB1); 899 done(ep, req, 0); 900 dev->ep0state = EP0_END_XFER; 901 local_irq_restore (flags); 902 return 0; 903 } 904 if (dev->req_pending) 905 ep0start(dev, UDCCS0_IPR, "OUT"); 906 if (length == 0 || ((udc_ep0_get_UDCCS(dev) & UDCCS0_RNE) != 0 907 && read_ep0_fifo(ep, req))) { 908 ep0_idle(dev); 909 done(ep, req, 0); 910 req = NULL; 911 } 912 break; 913 914 default: 915 DMSG("ep0 i/o, odd state %d\n", dev->ep0state); 916 local_irq_restore (flags); 917 return -EL2HLT; 918 } 919 /* can the FIFO can satisfy the request immediately? */ 920 } else if ((ep->bEndpointAddress & USB_DIR_IN) != 0) { 921 if ((udc_ep_get_UDCCS(ep) & UDCCS_BI_TFS) != 0 922 && write_fifo(ep, req)) 923 req = NULL; 924 } else if ((udc_ep_get_UDCCS(ep) & UDCCS_BO_RFS) != 0 925 && read_fifo(ep, req)) { 926 req = NULL; 927 } 928 929 if (likely(req && ep->ep.desc)) 930 pio_irq_enable(ep); 931 } 932 933 /* pio or dma irq handler advances the queue. */ 934 if (likely(req != NULL)) 935 list_add_tail(&req->queue, &ep->queue); 936 local_irq_restore(flags); 937 938 return 0; 939} 940 941 942/* 943 * nuke - dequeue ALL requests 944 */ 945static void nuke(struct pxa25x_ep *ep, int status) 946{ 947 struct pxa25x_request *req; 948 949 /* called with irqs blocked */ 950 while (!list_empty(&ep->queue)) { 951 req = list_entry(ep->queue.next, 952 struct pxa25x_request, 953 queue); 954 done(ep, req, status); 955 } 956 if (ep->ep.desc) 957 pio_irq_disable(ep); 958} 959 960 961/* dequeue JUST ONE request */ 962static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) 963{ 964 struct pxa25x_ep *ep; 965 struct pxa25x_request *req = NULL; 966 struct pxa25x_request *iter; 967 unsigned long flags; 968 969 ep = container_of(_ep, struct pxa25x_ep, ep); 970 if (!_ep || ep->ep.name == ep0name) 971 return -EINVAL; 972 973 local_irq_save(flags); 974 975 /* make sure it's actually queued on this endpoint */ 976 list_for_each_entry(iter, &ep->queue, queue) { 977 if (&iter->req != _req) 978 continue; 979 req = iter; 980 break; 981 } 982 if (!req) { 983 local_irq_restore(flags); 984 return -EINVAL; 985 } 986 987 done(ep, req, -ECONNRESET); 988 989 local_irq_restore(flags); 990 return 0; 991} 992 993/*-------------------------------------------------------------------------*/ 994 995static int pxa25x_ep_set_halt(struct usb_ep *_ep, int value) 996{ 997 struct pxa25x_ep *ep; 998 unsigned long flags; 999 1000 ep = container_of(_ep, struct pxa25x_ep, ep); 1001 if (unlikely (!_ep 1002 || (!ep->ep.desc && ep->ep.name != ep0name)) 1003 || ep->bmAttributes == USB_ENDPOINT_XFER_ISOC) { 1004 DMSG("%s, bad ep\n", __func__); 1005 return -EINVAL; 1006 } 1007 if (value == 0) { 1008 /* this path (reset toggle+halt) is needed to implement 1009 * SET_INTERFACE on normal hardware. but it can't be 1010 * done from software on the PXA UDC, and the hardware 1011 * forgets to do it as part of SET_INTERFACE automagic. 1012 */ 1013 DMSG("only host can clear %s halt\n", _ep->name); 1014 return -EROFS; 1015 } 1016 1017 local_irq_save(flags); 1018 1019 if ((ep->bEndpointAddress & USB_DIR_IN) != 0 1020 && ((udc_ep_get_UDCCS(ep) & UDCCS_BI_TFS) == 0 1021 || !list_empty(&ep->queue))) { 1022 local_irq_restore(flags); 1023 return -EAGAIN; 1024 } 1025 1026 /* FST bit is the same for control, bulk in, bulk out, interrupt in */ 1027 udc_ep_set_UDCCS(ep, UDCCS_BI_FST|UDCCS_BI_FTF); 1028 1029 /* ep0 needs special care */ 1030 if (!ep->ep.desc) { 1031 start_watchdog(ep->dev); 1032 ep->dev->req_pending = 0; 1033 ep->dev->ep0state = EP0_STALL; 1034 1035 /* and bulk/intr endpoints like dropping stalls too */ 1036 } else { 1037 unsigned i; 1038 for (i = 0; i < 1000; i += 20) { 1039 if (udc_ep_get_UDCCS(ep) & UDCCS_BI_SST) 1040 break; 1041 udelay(20); 1042 } 1043 } 1044 local_irq_restore(flags); 1045 1046 DBG(DBG_VERBOSE, "%s halt\n", _ep->name); 1047 return 0; 1048} 1049 1050static int pxa25x_ep_fifo_status(struct usb_ep *_ep) 1051{ 1052 struct pxa25x_ep *ep; 1053 1054 ep = container_of(_ep, struct pxa25x_ep, ep); 1055 if (!_ep) { 1056 DMSG("%s, bad ep\n", __func__); 1057 return -ENODEV; 1058 } 1059 /* pxa can't report unclaimed bytes from IN fifos */ 1060 if ((ep->bEndpointAddress & USB_DIR_IN) != 0) 1061 return -EOPNOTSUPP; 1062 if (ep->dev->gadget.speed == USB_SPEED_UNKNOWN 1063 || (udc_ep_get_UDCCS(ep) & UDCCS_BO_RFS) == 0) 1064 return 0; 1065 else 1066 return (udc_ep_get_UBCR(ep) & 0xfff) + 1; 1067} 1068 1069static void pxa25x_ep_fifo_flush(struct usb_ep *_ep) 1070{ 1071 struct pxa25x_ep *ep; 1072 1073 ep = container_of(_ep, struct pxa25x_ep, ep); 1074 if (!_ep || ep->ep.name == ep0name || !list_empty(&ep->queue)) { 1075 DMSG("%s, bad ep\n", __func__); 1076 return; 1077 } 1078 1079 /* toggle and halt bits stay unchanged */ 1080 1081 /* for OUT, just read and discard the FIFO contents. */ 1082 if ((ep->bEndpointAddress & USB_DIR_IN) == 0) { 1083 while (((udc_ep_get_UDCCS(ep)) & UDCCS_BO_RNE) != 0) 1084 (void)udc_ep_get_UDDR(ep); 1085 return; 1086 } 1087 1088 /* most IN status is the same, but ISO can't stall */ 1089 udc_ep_set_UDCCS(ep, UDCCS_BI_TPC|UDCCS_BI_FTF|UDCCS_BI_TUR 1090 | (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC 1091 ? 0 : UDCCS_BI_SST)); 1092} 1093 1094 1095static const struct usb_ep_ops pxa25x_ep_ops = { 1096 .enable = pxa25x_ep_enable, 1097 .disable = pxa25x_ep_disable, 1098 1099 .alloc_request = pxa25x_ep_alloc_request, 1100 .free_request = pxa25x_ep_free_request, 1101 1102 .queue = pxa25x_ep_queue, 1103 .dequeue = pxa25x_ep_dequeue, 1104 1105 .set_halt = pxa25x_ep_set_halt, 1106 .fifo_status = pxa25x_ep_fifo_status, 1107 .fifo_flush = pxa25x_ep_fifo_flush, 1108}; 1109 1110 1111/* --------------------------------------------------------------------------- 1112 * device-scoped parts of the api to the usb controller hardware 1113 * --------------------------------------------------------------------------- 1114 */ 1115 1116static int pxa25x_udc_get_frame(struct usb_gadget *_gadget) 1117{ 1118 struct pxa25x_udc *dev; 1119 1120 dev = container_of(_gadget, struct pxa25x_udc, gadget); 1121 return ((udc_get_reg(dev, UFNRH) & 0x07) << 8) | 1122 (udc_get_reg(dev, UFNRL) & 0xff); 1123} 1124 1125static int pxa25x_udc_wakeup(struct usb_gadget *_gadget) 1126{ 1127 struct pxa25x_udc *udc; 1128 1129 udc = container_of(_gadget, struct pxa25x_udc, gadget); 1130 1131 /* host may not have enabled remote wakeup */ 1132 if ((udc_ep0_get_UDCCS(udc) & UDCCS0_DRWF) == 0) 1133 return -EHOSTUNREACH; 1134 udc_set_mask_UDCCR(udc, UDCCR_RSM); 1135 return 0; 1136} 1137 1138static void stop_activity(struct pxa25x_udc *, struct usb_gadget_driver *); 1139static void udc_enable (struct pxa25x_udc *); 1140static void udc_disable(struct pxa25x_udc *); 1141 1142/* We disable the UDC -- and its 48 MHz clock -- whenever it's not 1143 * in active use. 1144 */ 1145static int pullup(struct pxa25x_udc *udc) 1146{ 1147 int is_active = udc->vbus && udc->pullup && !udc->suspended; 1148 DMSG("%s\n", is_active ? "active" : "inactive"); 1149 if (is_active) { 1150 if (!udc->active) { 1151 udc->active = 1; 1152 /* Enable clock for USB device */ 1153 clk_enable(udc->clk); 1154 udc_enable(udc); 1155 } 1156 } else { 1157 if (udc->active) { 1158 if (udc->gadget.speed != USB_SPEED_UNKNOWN) { 1159 DMSG("disconnect %s\n", udc->driver 1160 ? udc->driver->driver.name 1161 : "(no driver)"); 1162 stop_activity(udc, udc->driver); 1163 } 1164 udc_disable(udc); 1165 /* Disable clock for USB device */ 1166 clk_disable(udc->clk); 1167 udc->active = 0; 1168 } 1169 1170 } 1171 return 0; 1172} 1173 1174/* VBUS reporting logically comes from a transceiver */ 1175static int pxa25x_udc_vbus_session(struct usb_gadget *_gadget, int is_active) 1176{ 1177 struct pxa25x_udc *udc; 1178 1179 udc = container_of(_gadget, struct pxa25x_udc, gadget); 1180 udc->vbus = is_active; 1181 DMSG("vbus %s\n", is_active ? "supplied" : "inactive"); 1182 pullup(udc); 1183 return 0; 1184} 1185 1186/* drivers may have software control over D+ pullup */ 1187static int pxa25x_udc_pullup(struct usb_gadget *_gadget, int is_active) 1188{ 1189 struct pxa25x_udc *udc; 1190 1191 udc = container_of(_gadget, struct pxa25x_udc, gadget); 1192 1193 /* not all boards support pullup control */ 1194 if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command) 1195 return -EOPNOTSUPP; 1196 1197 udc->pullup = (is_active != 0); 1198 pullup(udc); 1199 return 0; 1200} 1201 1202/* boards may consume current from VBUS, up to 100-500mA based on config. 1203 * the 500uA suspend ceiling means that exclusively vbus-powered PXA designs 1204 * violate USB specs. 1205 */ 1206static int pxa25x_udc_vbus_draw(struct usb_gadget *_gadget, unsigned mA) 1207{ 1208 struct pxa25x_udc *udc; 1209 1210 udc = container_of(_gadget, struct pxa25x_udc, gadget); 1211 1212 if (!IS_ERR_OR_NULL(udc->transceiver)) 1213 return usb_phy_set_power(udc->transceiver, mA); 1214 return -EOPNOTSUPP; 1215} 1216 1217static int pxa25x_udc_start(struct usb_gadget *g, 1218 struct usb_gadget_driver *driver); 1219static int pxa25x_udc_stop(struct usb_gadget *g); 1220 1221static const struct usb_gadget_ops pxa25x_udc_ops = { 1222 .get_frame = pxa25x_udc_get_frame, 1223 .wakeup = pxa25x_udc_wakeup, 1224 .vbus_session = pxa25x_udc_vbus_session, 1225 .pullup = pxa25x_udc_pullup, 1226 .vbus_draw = pxa25x_udc_vbus_draw, 1227 .udc_start = pxa25x_udc_start, 1228 .udc_stop = pxa25x_udc_stop, 1229}; 1230 1231/*-------------------------------------------------------------------------*/ 1232 1233#ifdef CONFIG_USB_GADGET_DEBUG_FS 1234 1235static int udc_debug_show(struct seq_file *m, void *_d) 1236{ 1237 struct pxa25x_udc *dev = m->private; 1238 unsigned long flags; 1239 int i; 1240 u32 tmp; 1241 1242 local_irq_save(flags); 1243 1244 /* basic device status */ 1245 seq_printf(m, DRIVER_DESC "\n" 1246 "%s version: %s\nGadget driver: %s\nHost %s\n\n", 1247 driver_name, DRIVER_VERSION SIZE_STR "(pio)", 1248 dev->driver ? dev->driver->driver.name : "(none)", 1249 dev->gadget.speed == USB_SPEED_FULL ? "full speed" : "disconnected"); 1250 1251 /* registers for device and ep0 */ 1252 seq_printf(m, 1253 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n", 1254 udc_get_reg(dev, UICR1), udc_get_reg(dev, UICR0), 1255 udc_get_reg(dev, USIR1), udc_get_reg(dev, USIR0), 1256 udc_get_reg(dev, UFNRH), udc_get_reg(dev, UFNRL)); 1257 1258 tmp = udc_get_reg(dev, UDCCR); 1259 seq_printf(m, 1260 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp, 1261 (tmp & UDCCR_REM) ? " rem" : "", 1262 (tmp & UDCCR_RSTIR) ? " rstir" : "", 1263 (tmp & UDCCR_SRM) ? " srm" : "", 1264 (tmp & UDCCR_SUSIR) ? " susir" : "", 1265 (tmp & UDCCR_RESIR) ? " resir" : "", 1266 (tmp & UDCCR_RSM) ? " rsm" : "", 1267 (tmp & UDCCR_UDA) ? " uda" : "", 1268 (tmp & UDCCR_UDE) ? " ude" : ""); 1269 1270 tmp = udc_ep0_get_UDCCS(dev); 1271 seq_printf(m, 1272 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp, 1273 (tmp & UDCCS0_SA) ? " sa" : "", 1274 (tmp & UDCCS0_RNE) ? " rne" : "", 1275 (tmp & UDCCS0_FST) ? " fst" : "", 1276 (tmp & UDCCS0_SST) ? " sst" : "", 1277 (tmp & UDCCS0_DRWF) ? " dwrf" : "", 1278 (tmp & UDCCS0_FTF) ? " ftf" : "", 1279 (tmp & UDCCS0_IPR) ? " ipr" : "", 1280 (tmp & UDCCS0_OPR) ? " opr" : ""); 1281 1282 if (dev->has_cfr) { 1283 tmp = udc_get_reg(dev, UDCCFR); 1284 seq_printf(m, 1285 "udccfr %02X =%s%s\n", tmp, 1286 (tmp & UDCCFR_AREN) ? " aren" : "", 1287 (tmp & UDCCFR_ACM) ? " acm" : ""); 1288 } 1289 1290 if (dev->gadget.speed != USB_SPEED_FULL || !dev->driver) 1291 goto done; 1292 1293 seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n", 1294 dev->stats.write.bytes, dev->stats.write.ops, 1295 dev->stats.read.bytes, dev->stats.read.ops, 1296 dev->stats.irqs); 1297 1298 /* dump endpoint queues */ 1299 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { 1300 struct pxa25x_ep *ep = &dev->ep [i]; 1301 struct pxa25x_request *req; 1302 1303 if (i != 0) { 1304 const struct usb_endpoint_descriptor *desc; 1305 1306 desc = ep->ep.desc; 1307 if (!desc) 1308 continue; 1309 tmp = udc_ep_get_UDCCS(&dev->ep[i]); 1310 seq_printf(m, 1311 "%s max %d %s udccs %02x irqs %lu\n", 1312 ep->ep.name, usb_endpoint_maxp(desc), 1313 "pio", tmp, ep->pio_irqs); 1314 /* TODO translate all five groups of udccs bits! */ 1315 1316 } else /* ep0 should only have one transfer queued */ 1317 seq_printf(m, "ep0 max 16 pio irqs %lu\n", 1318 ep->pio_irqs); 1319 1320 if (list_empty(&ep->queue)) { 1321 seq_printf(m, "\t(nothing queued)\n"); 1322 continue; 1323 } 1324 list_for_each_entry(req, &ep->queue, queue) { 1325 seq_printf(m, 1326 "\treq %p len %d/%d buf %p\n", 1327 &req->req, req->req.actual, 1328 req->req.length, req->req.buf); 1329 } 1330 } 1331 1332done: 1333 local_irq_restore(flags); 1334 return 0; 1335} 1336DEFINE_SHOW_ATTRIBUTE(udc_debug); 1337 1338#define create_debug_files(dev) \ 1339 do { \ 1340 debugfs_create_file(dev->gadget.name, \ 1341 S_IRUGO, NULL, dev, &udc_debug_fops); \ 1342 } while (0) 1343#define remove_debug_files(dev) debugfs_lookup_and_remove(dev->gadget.name, NULL) 1344 1345#else /* !CONFIG_USB_GADGET_DEBUG_FILES */ 1346 1347#define create_debug_files(dev) do {} while (0) 1348#define remove_debug_files(dev) do {} while (0) 1349 1350#endif /* CONFIG_USB_GADGET_DEBUG_FILES */ 1351 1352/*-------------------------------------------------------------------------*/ 1353 1354/* 1355 * udc_disable - disable USB device controller 1356 */ 1357static void udc_disable(struct pxa25x_udc *dev) 1358{ 1359 /* block all irqs */ 1360 udc_set_mask_UDCCR(dev, UDCCR_SRM|UDCCR_REM); 1361 udc_set_reg(dev, UICR0, 0xff); 1362 udc_set_reg(dev, UICR1, 0xff); 1363 udc_set_reg(dev, UFNRH, UFNRH_SIM); 1364 1365 /* if hardware supports it, disconnect from usb */ 1366 pullup_off(); 1367 1368 udc_clear_mask_UDCCR(dev, UDCCR_UDE); 1369 1370 ep0_idle (dev); 1371 dev->gadget.speed = USB_SPEED_UNKNOWN; 1372} 1373 1374 1375/* 1376 * udc_reinit - initialize software state 1377 */ 1378static void udc_reinit(struct pxa25x_udc *dev) 1379{ 1380 u32 i; 1381 1382 /* device/ep0 records init */ 1383 INIT_LIST_HEAD (&dev->gadget.ep_list); 1384 INIT_LIST_HEAD (&dev->gadget.ep0->ep_list); 1385 dev->ep0state = EP0_IDLE; 1386 dev->gadget.quirk_altset_not_supp = 1; 1387 1388 /* basic endpoint records init */ 1389 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { 1390 struct pxa25x_ep *ep = &dev->ep[i]; 1391 1392 if (i != 0) 1393 list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list); 1394 1395 ep->ep.desc = NULL; 1396 ep->stopped = 0; 1397 INIT_LIST_HEAD (&ep->queue); 1398 ep->pio_irqs = 0; 1399 usb_ep_set_maxpacket_limit(&ep->ep, ep->ep.maxpacket); 1400 } 1401 1402 /* the rest was statically initialized, and is read-only */ 1403} 1404 1405/* until it's enabled, this UDC should be completely invisible 1406 * to any USB host. 1407 */ 1408static void udc_enable (struct pxa25x_udc *dev) 1409{ 1410 udc_clear_mask_UDCCR(dev, UDCCR_UDE); 1411 1412 /* try to clear these bits before we enable the udc */ 1413 udc_ack_int_UDCCR(dev, UDCCR_SUSIR|/*UDCCR_RSTIR|*/UDCCR_RESIR); 1414 1415 ep0_idle(dev); 1416 dev->gadget.speed = USB_SPEED_UNKNOWN; 1417 dev->stats.irqs = 0; 1418 1419 /* 1420 * sequence taken from chapter 12.5.10, PXA250 AppProcDevManual: 1421 * - enable UDC 1422 * - if RESET is already in progress, ack interrupt 1423 * - unmask reset interrupt 1424 */ 1425 udc_set_mask_UDCCR(dev, UDCCR_UDE); 1426 if (!(udc_get_reg(dev, UDCCR) & UDCCR_UDA)) 1427 udc_ack_int_UDCCR(dev, UDCCR_RSTIR); 1428 1429 if (dev->has_cfr /* UDC_RES2 is defined */) { 1430 /* pxa255 (a0+) can avoid a set_config race that could 1431 * prevent gadget drivers from configuring correctly 1432 */ 1433 udc_set_reg(dev, UDCCFR, UDCCFR_ACM | UDCCFR_MB1); 1434 } else { 1435 /* "USB test mode" for pxa250 errata 40-42 (stepping a0, a1) 1436 * which could result in missing packets and interrupts. 1437 * supposedly one bit per endpoint, controlling whether it 1438 * double buffers or not; ACM/AREN bits fit into the holes. 1439 * zero bits (like USIR0_IRx) disable double buffering. 1440 */ 1441 udc_set_reg(dev, UDC_RES1, 0x00); 1442 udc_set_reg(dev, UDC_RES2, 0x00); 1443 } 1444 1445 /* enable suspend/resume and reset irqs */ 1446 udc_clear_mask_UDCCR(dev, UDCCR_SRM | UDCCR_REM); 1447 1448 /* enable ep0 irqs */ 1449 udc_set_reg(dev, UICR0, udc_get_reg(dev, UICR0) & ~UICR0_IM0); 1450 1451 /* if hardware supports it, pullup D+ and wait for reset */ 1452 pullup_on(); 1453} 1454 1455 1456/* when a driver is successfully registered, it will receive 1457 * control requests including set_configuration(), which enables 1458 * non-control requests. then usb traffic follows until a 1459 * disconnect is reported. then a host may connect again, or 1460 * the driver might get unbound. 1461 */ 1462static int pxa25x_udc_start(struct usb_gadget *g, 1463 struct usb_gadget_driver *driver) 1464{ 1465 struct pxa25x_udc *dev = to_pxa25x(g); 1466 int retval; 1467 1468 /* first hook up the driver ... */ 1469 dev->driver = driver; 1470 dev->pullup = 1; 1471 1472 /* ... then enable host detection and ep0; and we're ready 1473 * for set_configuration as well as eventual disconnect. 1474 */ 1475 /* connect to bus through transceiver */ 1476 if (!IS_ERR_OR_NULL(dev->transceiver)) { 1477 retval = otg_set_peripheral(dev->transceiver->otg, 1478 &dev->gadget); 1479 if (retval) 1480 goto bind_fail; 1481 } 1482 1483 dump_state(dev); 1484 return 0; 1485bind_fail: 1486 return retval; 1487} 1488 1489static void 1490reset_gadget(struct pxa25x_udc *dev, struct usb_gadget_driver *driver) 1491{ 1492 int i; 1493 1494 /* don't disconnect drivers more than once */ 1495 if (dev->gadget.speed == USB_SPEED_UNKNOWN) 1496 driver = NULL; 1497 dev->gadget.speed = USB_SPEED_UNKNOWN; 1498 1499 /* prevent new request submissions, kill any outstanding requests */ 1500 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { 1501 struct pxa25x_ep *ep = &dev->ep[i]; 1502 1503 ep->stopped = 1; 1504 nuke(ep, -ESHUTDOWN); 1505 } 1506 del_timer_sync(&dev->timer); 1507 1508 /* report reset; the driver is already quiesced */ 1509 if (driver) 1510 usb_gadget_udc_reset(&dev->gadget, driver); 1511 1512 /* re-init driver-visible data structures */ 1513 udc_reinit(dev); 1514} 1515 1516static void 1517stop_activity(struct pxa25x_udc *dev, struct usb_gadget_driver *driver) 1518{ 1519 int i; 1520 1521 /* don't disconnect drivers more than once */ 1522 if (dev->gadget.speed == USB_SPEED_UNKNOWN) 1523 driver = NULL; 1524 dev->gadget.speed = USB_SPEED_UNKNOWN; 1525 1526 /* prevent new request submissions, kill any outstanding requests */ 1527 for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) { 1528 struct pxa25x_ep *ep = &dev->ep[i]; 1529 1530 ep->stopped = 1; 1531 nuke(ep, -ESHUTDOWN); 1532 } 1533 del_timer_sync(&dev->timer); 1534 1535 /* report disconnect; the driver is already quiesced */ 1536 if (driver) 1537 driver->disconnect(&dev->gadget); 1538 1539 /* re-init driver-visible data structures */ 1540 udc_reinit(dev); 1541} 1542 1543static int pxa25x_udc_stop(struct usb_gadget*g) 1544{ 1545 struct pxa25x_udc *dev = to_pxa25x(g); 1546 1547 local_irq_disable(); 1548 dev->pullup = 0; 1549 stop_activity(dev, NULL); 1550 local_irq_enable(); 1551 1552 if (!IS_ERR_OR_NULL(dev->transceiver)) 1553 (void) otg_set_peripheral(dev->transceiver->otg, NULL); 1554 1555 dev->driver = NULL; 1556 1557 dump_state(dev); 1558 1559 return 0; 1560} 1561 1562/*-------------------------------------------------------------------------*/ 1563 1564static inline void clear_ep_state (struct pxa25x_udc *dev) 1565{ 1566 unsigned i; 1567 1568 /* hardware SET_{CONFIGURATION,INTERFACE} automagic resets endpoint 1569 * fifos, and pending transactions mustn't be continued in any case. 1570 */ 1571 for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++) 1572 nuke(&dev->ep[i], -ECONNABORTED); 1573} 1574 1575static void udc_watchdog(struct timer_list *t) 1576{ 1577 struct pxa25x_udc *dev = from_timer(dev, t, timer); 1578 1579 local_irq_disable(); 1580 if (dev->ep0state == EP0_STALL 1581 && (udc_ep0_get_UDCCS(dev) & UDCCS0_FST) == 0 1582 && (udc_ep0_get_UDCCS(dev) & UDCCS0_SST) == 0) { 1583 udc_ep0_set_UDCCS(dev, UDCCS0_FST|UDCCS0_FTF); 1584 DBG(DBG_VERBOSE, "ep0 re-stall\n"); 1585 start_watchdog(dev); 1586 } 1587 local_irq_enable(); 1588} 1589 1590static void handle_ep0 (struct pxa25x_udc *dev) 1591{ 1592 u32 udccs0 = udc_ep0_get_UDCCS(dev); 1593 struct pxa25x_ep *ep = &dev->ep [0]; 1594 struct pxa25x_request *req; 1595 union { 1596 struct usb_ctrlrequest r; 1597 u8 raw [8]; 1598 u32 word [2]; 1599 } u; 1600 1601 if (list_empty(&ep->queue)) 1602 req = NULL; 1603 else 1604 req = list_entry(ep->queue.next, struct pxa25x_request, queue); 1605 1606 /* clear stall status */ 1607 if (udccs0 & UDCCS0_SST) { 1608 nuke(ep, -EPIPE); 1609 udc_ep0_set_UDCCS(dev, UDCCS0_SST); 1610 del_timer(&dev->timer); 1611 ep0_idle(dev); 1612 } 1613 1614 /* previous request unfinished? non-error iff back-to-back ... */ 1615 if ((udccs0 & UDCCS0_SA) != 0 && dev->ep0state != EP0_IDLE) { 1616 nuke(ep, 0); 1617 del_timer(&dev->timer); 1618 ep0_idle(dev); 1619 } 1620 1621 switch (dev->ep0state) { 1622 case EP0_IDLE: 1623 /* late-breaking status? */ 1624 udccs0 = udc_ep0_get_UDCCS(dev); 1625 1626 /* start control request? */ 1627 if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE)) 1628 == (UDCCS0_OPR|UDCCS0_SA|UDCCS0_RNE))) { 1629 int i; 1630 1631 nuke (ep, -EPROTO); 1632 1633 /* read SETUP packet */ 1634 for (i = 0; i < 8; i++) { 1635 if (unlikely(!(udc_ep0_get_UDCCS(dev) & UDCCS0_RNE))) { 1636bad_setup: 1637 DMSG("SETUP %d!\n", i); 1638 goto stall; 1639 } 1640 u.raw [i] = (u8) UDDR0; 1641 } 1642 if (unlikely((udc_ep0_get_UDCCS(dev) & UDCCS0_RNE) != 0)) 1643 goto bad_setup; 1644 1645got_setup: 1646 DBG(DBG_VERBOSE, "SETUP %02x.%02x v%04x i%04x l%04x\n", 1647 u.r.bRequestType, u.r.bRequest, 1648 le16_to_cpu(u.r.wValue), 1649 le16_to_cpu(u.r.wIndex), 1650 le16_to_cpu(u.r.wLength)); 1651 1652 /* cope with automagic for some standard requests. */ 1653 dev->req_std = (u.r.bRequestType & USB_TYPE_MASK) 1654 == USB_TYPE_STANDARD; 1655 dev->req_config = 0; 1656 dev->req_pending = 1; 1657 switch (u.r.bRequest) { 1658 /* hardware restricts gadget drivers here! */ 1659 case USB_REQ_SET_CONFIGURATION: 1660 if (u.r.bRequestType == USB_RECIP_DEVICE) { 1661 /* reflect hardware's automagic 1662 * up to the gadget driver. 1663 */ 1664config_change: 1665 dev->req_config = 1; 1666 clear_ep_state(dev); 1667 /* if !has_cfr, there's no synch 1668 * else use AREN (later) not SA|OPR 1669 * USIR0_IR0 acts edge sensitive 1670 */ 1671 } 1672 break; 1673 /* ... and here, even more ... */ 1674 case USB_REQ_SET_INTERFACE: 1675 if (u.r.bRequestType == USB_RECIP_INTERFACE) { 1676 /* udc hardware is broken by design: 1677 * - altsetting may only be zero; 1678 * - hw resets all interfaces' eps; 1679 * - ep reset doesn't include halt(?). 1680 */ 1681 DMSG("broken set_interface (%d/%d)\n", 1682 le16_to_cpu(u.r.wIndex), 1683 le16_to_cpu(u.r.wValue)); 1684 goto config_change; 1685 } 1686 break; 1687 /* hardware was supposed to hide this */ 1688 case USB_REQ_SET_ADDRESS: 1689 if (u.r.bRequestType == USB_RECIP_DEVICE) { 1690 ep0start(dev, 0, "address"); 1691 return; 1692 } 1693 break; 1694 } 1695 1696 if (u.r.bRequestType & USB_DIR_IN) 1697 dev->ep0state = EP0_IN_DATA_PHASE; 1698 else 1699 dev->ep0state = EP0_OUT_DATA_PHASE; 1700 1701 i = dev->driver->setup(&dev->gadget, &u.r); 1702 if (i < 0) { 1703 /* hardware automagic preventing STALL... */ 1704 if (dev->req_config) { 1705 /* hardware sometimes neglects to tell 1706 * tell us about config change events, 1707 * so later ones may fail... 1708 */ 1709 WARNING("config change %02x fail %d?\n", 1710 u.r.bRequest, i); 1711 return; 1712 /* TODO experiment: if has_cfr, 1713 * hardware didn't ACK; maybe we 1714 * could actually STALL! 1715 */ 1716 } 1717 DBG(DBG_VERBOSE, "protocol STALL, " 1718 "%02x err %d\n", udc_ep0_get_UDCCS(dev), i); 1719stall: 1720 /* the watchdog timer helps deal with cases 1721 * where udc seems to clear FST wrongly, and 1722 * then NAKs instead of STALLing. 1723 */ 1724 ep0start(dev, UDCCS0_FST|UDCCS0_FTF, "stall"); 1725 start_watchdog(dev); 1726 dev->ep0state = EP0_STALL; 1727 1728 /* deferred i/o == no response yet */ 1729 } else if (dev->req_pending) { 1730 if (likely(dev->ep0state == EP0_IN_DATA_PHASE 1731 || dev->req_std || u.r.wLength)) 1732 ep0start(dev, 0, "defer"); 1733 else 1734 ep0start(dev, UDCCS0_IPR, "defer/IPR"); 1735 } 1736 1737 /* expect at least one data or status stage irq */ 1738 return; 1739 1740 } else if (likely((udccs0 & (UDCCS0_OPR|UDCCS0_SA)) 1741 == (UDCCS0_OPR|UDCCS0_SA))) { 1742 unsigned i; 1743 1744 /* pxa210/250 erratum 131 for B0/B1 says RNE lies. 1745 * still observed on a pxa255 a0. 1746 */ 1747 DBG(DBG_VERBOSE, "e131\n"); 1748 nuke(ep, -EPROTO); 1749 1750 /* read SETUP data, but don't trust it too much */ 1751 for (i = 0; i < 8; i++) 1752 u.raw [i] = (u8) UDDR0; 1753 if ((u.r.bRequestType & USB_RECIP_MASK) 1754 > USB_RECIP_OTHER) 1755 goto stall; 1756 if (u.word [0] == 0 && u.word [1] == 0) 1757 goto stall; 1758 goto got_setup; 1759 } else { 1760 /* some random early IRQ: 1761 * - we acked FST 1762 * - IPR cleared 1763 * - OPR got set, without SA (likely status stage) 1764 */ 1765 udc_ep0_set_UDCCS(dev, udccs0 & (UDCCS0_SA|UDCCS0_OPR)); 1766 } 1767 break; 1768 case EP0_IN_DATA_PHASE: /* GET_DESCRIPTOR etc */ 1769 if (udccs0 & UDCCS0_OPR) { 1770 udc_ep0_set_UDCCS(dev, UDCCS0_OPR|UDCCS0_FTF); 1771 DBG(DBG_VERBOSE, "ep0in premature status\n"); 1772 if (req) 1773 done(ep, req, 0); 1774 ep0_idle(dev); 1775 } else /* irq was IPR clearing */ { 1776 if (req) { 1777 /* this IN packet might finish the request */ 1778 (void) write_ep0_fifo(ep, req); 1779 } /* else IN token before response was written */ 1780 } 1781 break; 1782 case EP0_OUT_DATA_PHASE: /* SET_DESCRIPTOR etc */ 1783 if (udccs0 & UDCCS0_OPR) { 1784 if (req) { 1785 /* this OUT packet might finish the request */ 1786 if (read_ep0_fifo(ep, req)) 1787 done(ep, req, 0); 1788 /* else more OUT packets expected */ 1789 } /* else OUT token before read was issued */ 1790 } else /* irq was IPR clearing */ { 1791 DBG(DBG_VERBOSE, "ep0out premature status\n"); 1792 if (req) 1793 done(ep, req, 0); 1794 ep0_idle(dev); 1795 } 1796 break; 1797 case EP0_END_XFER: 1798 if (req) 1799 done(ep, req, 0); 1800 /* ack control-IN status (maybe in-zlp was skipped) 1801 * also appears after some config change events. 1802 */ 1803 if (udccs0 & UDCCS0_OPR) 1804 udc_ep0_set_UDCCS(dev, UDCCS0_OPR); 1805 ep0_idle(dev); 1806 break; 1807 case EP0_STALL: 1808 udc_ep0_set_UDCCS(dev, UDCCS0_FST); 1809 break; 1810 } 1811 udc_set_reg(dev, USIR0, USIR0_IR0); 1812} 1813 1814static void handle_ep(struct pxa25x_ep *ep) 1815{ 1816 struct pxa25x_request *req; 1817 int is_in = ep->bEndpointAddress & USB_DIR_IN; 1818 int completed; 1819 u32 udccs, tmp; 1820 1821 do { 1822 completed = 0; 1823 if (likely (!list_empty(&ep->queue))) 1824 req = list_entry(ep->queue.next, 1825 struct pxa25x_request, queue); 1826 else 1827 req = NULL; 1828 1829 // TODO check FST handling 1830 1831 udccs = udc_ep_get_UDCCS(ep); 1832 if (unlikely(is_in)) { /* irq from TPC, SST, or (ISO) TUR */ 1833 tmp = UDCCS_BI_TUR; 1834 if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK)) 1835 tmp |= UDCCS_BI_SST; 1836 tmp &= udccs; 1837 if (likely (tmp)) 1838 udc_ep_set_UDCCS(ep, tmp); 1839 if (req && likely ((udccs & UDCCS_BI_TFS) != 0)) 1840 completed = write_fifo(ep, req); 1841 1842 } else { /* irq from RPC (or for ISO, ROF) */ 1843 if (likely(ep->bmAttributes == USB_ENDPOINT_XFER_BULK)) 1844 tmp = UDCCS_BO_SST | UDCCS_BO_DME; 1845 else 1846 tmp = UDCCS_IO_ROF | UDCCS_IO_DME; 1847 tmp &= udccs; 1848 if (likely(tmp)) 1849 udc_ep_set_UDCCS(ep, tmp); 1850 1851 /* fifos can hold packets, ready for reading... */ 1852 if (likely(req)) { 1853 completed = read_fifo(ep, req); 1854 } else 1855 pio_irq_disable(ep); 1856 } 1857 ep->pio_irqs++; 1858 } while (completed); 1859} 1860 1861/* 1862 * pxa25x_udc_irq - interrupt handler 1863 * 1864 * avoid delays in ep0 processing. the control handshaking isn't always 1865 * under software control (pxa250c0 and the pxa255 are better), and delays 1866 * could cause usb protocol errors. 1867 */ 1868static irqreturn_t 1869pxa25x_udc_irq(int irq, void *_dev) 1870{ 1871 struct pxa25x_udc *dev = _dev; 1872 int handled; 1873 1874 dev->stats.irqs++; 1875 do { 1876 u32 udccr = udc_get_reg(dev, UDCCR); 1877 1878 handled = 0; 1879 1880 /* SUSpend Interrupt Request */ 1881 if (unlikely(udccr & UDCCR_SUSIR)) { 1882 udc_ack_int_UDCCR(dev, UDCCR_SUSIR); 1883 handled = 1; 1884 DBG(DBG_VERBOSE, "USB suspend\n"); 1885 1886 if (dev->gadget.speed != USB_SPEED_UNKNOWN 1887 && dev->driver 1888 && dev->driver->suspend) 1889 dev->driver->suspend(&dev->gadget); 1890 ep0_idle (dev); 1891 } 1892 1893 /* RESume Interrupt Request */ 1894 if (unlikely(udccr & UDCCR_RESIR)) { 1895 udc_ack_int_UDCCR(dev, UDCCR_RESIR); 1896 handled = 1; 1897 DBG(DBG_VERBOSE, "USB resume\n"); 1898 1899 if (dev->gadget.speed != USB_SPEED_UNKNOWN 1900 && dev->driver 1901 && dev->driver->resume) 1902 dev->driver->resume(&dev->gadget); 1903 } 1904 1905 /* ReSeT Interrupt Request - USB reset */ 1906 if (unlikely(udccr & UDCCR_RSTIR)) { 1907 udc_ack_int_UDCCR(dev, UDCCR_RSTIR); 1908 handled = 1; 1909 1910 if ((udc_get_reg(dev, UDCCR) & UDCCR_UDA) == 0) { 1911 DBG(DBG_VERBOSE, "USB reset start\n"); 1912 1913 /* reset driver and endpoints, 1914 * in case that's not yet done 1915 */ 1916 reset_gadget(dev, dev->driver); 1917 1918 } else { 1919 DBG(DBG_VERBOSE, "USB reset end\n"); 1920 dev->gadget.speed = USB_SPEED_FULL; 1921 memset(&dev->stats, 0, sizeof dev->stats); 1922 /* driver and endpoints are still reset */ 1923 } 1924 1925 } else { 1926 u32 usir0 = udc_get_reg(dev, USIR0) & 1927 ~udc_get_reg(dev, UICR0); 1928 u32 usir1 = udc_get_reg(dev, USIR1) & 1929 ~udc_get_reg(dev, UICR1); 1930 int i; 1931 1932 if (unlikely (!usir0 && !usir1)) 1933 continue; 1934 1935 DBG(DBG_VERY_NOISY, "irq %02x.%02x\n", usir1, usir0); 1936 1937 /* control traffic */ 1938 if (usir0 & USIR0_IR0) { 1939 dev->ep[0].pio_irqs++; 1940 handle_ep0(dev); 1941 handled = 1; 1942 } 1943 1944 /* endpoint data transfers */ 1945 for (i = 0; i < 8; i++) { 1946 u32 tmp = 1 << i; 1947 1948 if (i && (usir0 & tmp)) { 1949 handle_ep(&dev->ep[i]); 1950 udc_set_reg(dev, USIR0, 1951 udc_get_reg(dev, USIR0) | tmp); 1952 handled = 1; 1953 } 1954#ifndef CONFIG_USB_PXA25X_SMALL 1955 if (usir1 & tmp) { 1956 handle_ep(&dev->ep[i+8]); 1957 udc_set_reg(dev, USIR1, 1958 udc_get_reg(dev, USIR1) | tmp); 1959 handled = 1; 1960 } 1961#endif 1962 } 1963 } 1964 1965 /* we could also ask for 1 msec SOF (SIR) interrupts */ 1966 1967 } while (handled); 1968 return IRQ_HANDLED; 1969} 1970 1971/*-------------------------------------------------------------------------*/ 1972 1973static void nop_release (struct device *dev) 1974{ 1975 DMSG("%s %s\n", __func__, dev_name(dev)); 1976} 1977 1978/* this uses load-time allocation and initialization (instead of 1979 * doing it at run-time) to save code, eliminate fault paths, and 1980 * be more obviously correct. 1981 */ 1982static struct pxa25x_udc memory = { 1983 .gadget = { 1984 .ops = &pxa25x_udc_ops, 1985 .ep0 = &memory.ep[0].ep, 1986 .name = driver_name, 1987 .dev = { 1988 .init_name = "gadget", 1989 .release = nop_release, 1990 }, 1991 }, 1992 1993 /* control endpoint */ 1994 .ep[0] = { 1995 .ep = { 1996 .name = ep0name, 1997 .ops = &pxa25x_ep_ops, 1998 .maxpacket = EP0_FIFO_SIZE, 1999 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, 2000 USB_EP_CAPS_DIR_ALL), 2001 }, 2002 .dev = &memory, 2003 .regoff_udccs = UDCCS0, 2004 .regoff_uddr = UDDR0, 2005 }, 2006 2007 /* first group of endpoints */ 2008 .ep[1] = { 2009 .ep = { 2010 .name = "ep1in-bulk", 2011 .ops = &pxa25x_ep_ops, 2012 .maxpacket = BULK_FIFO_SIZE, 2013 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, 2014 USB_EP_CAPS_DIR_IN), 2015 }, 2016 .dev = &memory, 2017 .fifo_size = BULK_FIFO_SIZE, 2018 .bEndpointAddress = USB_DIR_IN | 1, 2019 .bmAttributes = USB_ENDPOINT_XFER_BULK, 2020 .regoff_udccs = UDCCS1, 2021 .regoff_uddr = UDDR1, 2022 }, 2023 .ep[2] = { 2024 .ep = { 2025 .name = "ep2out-bulk", 2026 .ops = &pxa25x_ep_ops, 2027 .maxpacket = BULK_FIFO_SIZE, 2028 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, 2029 USB_EP_CAPS_DIR_OUT), 2030 }, 2031 .dev = &memory, 2032 .fifo_size = BULK_FIFO_SIZE, 2033 .bEndpointAddress = 2, 2034 .bmAttributes = USB_ENDPOINT_XFER_BULK, 2035 .regoff_udccs = UDCCS2, 2036 .regoff_ubcr = UBCR2, 2037 .regoff_uddr = UDDR2, 2038 }, 2039#ifndef CONFIG_USB_PXA25X_SMALL 2040 .ep[3] = { 2041 .ep = { 2042 .name = "ep3in-iso", 2043 .ops = &pxa25x_ep_ops, 2044 .maxpacket = ISO_FIFO_SIZE, 2045 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, 2046 USB_EP_CAPS_DIR_IN), 2047 }, 2048 .dev = &memory, 2049 .fifo_size = ISO_FIFO_SIZE, 2050 .bEndpointAddress = USB_DIR_IN | 3, 2051 .bmAttributes = USB_ENDPOINT_XFER_ISOC, 2052 .regoff_udccs = UDCCS3, 2053 .regoff_uddr = UDDR3, 2054 }, 2055 .ep[4] = { 2056 .ep = { 2057 .name = "ep4out-iso", 2058 .ops = &pxa25x_ep_ops, 2059 .maxpacket = ISO_FIFO_SIZE, 2060 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, 2061 USB_EP_CAPS_DIR_OUT), 2062 }, 2063 .dev = &memory, 2064 .fifo_size = ISO_FIFO_SIZE, 2065 .bEndpointAddress = 4, 2066 .bmAttributes = USB_ENDPOINT_XFER_ISOC, 2067 .regoff_udccs = UDCCS4, 2068 .regoff_ubcr = UBCR4, 2069 .regoff_uddr = UDDR4, 2070 }, 2071 .ep[5] = { 2072 .ep = { 2073 .name = "ep5in-int", 2074 .ops = &pxa25x_ep_ops, 2075 .maxpacket = INT_FIFO_SIZE, 2076 .caps = USB_EP_CAPS(0, 0), 2077 }, 2078 .dev = &memory, 2079 .fifo_size = INT_FIFO_SIZE, 2080 .bEndpointAddress = USB_DIR_IN | 5, 2081 .bmAttributes = USB_ENDPOINT_XFER_INT, 2082 .regoff_udccs = UDCCS5, 2083 .regoff_uddr = UDDR5, 2084 }, 2085 2086 /* second group of endpoints */ 2087 .ep[6] = { 2088 .ep = { 2089 .name = "ep6in-bulk", 2090 .ops = &pxa25x_ep_ops, 2091 .maxpacket = BULK_FIFO_SIZE, 2092 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, 2093 USB_EP_CAPS_DIR_IN), 2094 }, 2095 .dev = &memory, 2096 .fifo_size = BULK_FIFO_SIZE, 2097 .bEndpointAddress = USB_DIR_IN | 6, 2098 .bmAttributes = USB_ENDPOINT_XFER_BULK, 2099 .regoff_udccs = UDCCS6, 2100 .regoff_uddr = UDDR6, 2101 }, 2102 .ep[7] = { 2103 .ep = { 2104 .name = "ep7out-bulk", 2105 .ops = &pxa25x_ep_ops, 2106 .maxpacket = BULK_FIFO_SIZE, 2107 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, 2108 USB_EP_CAPS_DIR_OUT), 2109 }, 2110 .dev = &memory, 2111 .fifo_size = BULK_FIFO_SIZE, 2112 .bEndpointAddress = 7, 2113 .bmAttributes = USB_ENDPOINT_XFER_BULK, 2114 .regoff_udccs = UDCCS7, 2115 .regoff_ubcr = UBCR7, 2116 .regoff_uddr = UDDR7, 2117 }, 2118 .ep[8] = { 2119 .ep = { 2120 .name = "ep8in-iso", 2121 .ops = &pxa25x_ep_ops, 2122 .maxpacket = ISO_FIFO_SIZE, 2123 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, 2124 USB_EP_CAPS_DIR_IN), 2125 }, 2126 .dev = &memory, 2127 .fifo_size = ISO_FIFO_SIZE, 2128 .bEndpointAddress = USB_DIR_IN | 8, 2129 .bmAttributes = USB_ENDPOINT_XFER_ISOC, 2130 .regoff_udccs = UDCCS8, 2131 .regoff_uddr = UDDR8, 2132 }, 2133 .ep[9] = { 2134 .ep = { 2135 .name = "ep9out-iso", 2136 .ops = &pxa25x_ep_ops, 2137 .maxpacket = ISO_FIFO_SIZE, 2138 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, 2139 USB_EP_CAPS_DIR_OUT), 2140 }, 2141 .dev = &memory, 2142 .fifo_size = ISO_FIFO_SIZE, 2143 .bEndpointAddress = 9, 2144 .bmAttributes = USB_ENDPOINT_XFER_ISOC, 2145 .regoff_udccs = UDCCS9, 2146 .regoff_ubcr = UBCR9, 2147 .regoff_uddr = UDDR9, 2148 }, 2149 .ep[10] = { 2150 .ep = { 2151 .name = "ep10in-int", 2152 .ops = &pxa25x_ep_ops, 2153 .maxpacket = INT_FIFO_SIZE, 2154 .caps = USB_EP_CAPS(0, 0), 2155 }, 2156 .dev = &memory, 2157 .fifo_size = INT_FIFO_SIZE, 2158 .bEndpointAddress = USB_DIR_IN | 10, 2159 .bmAttributes = USB_ENDPOINT_XFER_INT, 2160 .regoff_udccs = UDCCS10, 2161 .regoff_uddr = UDDR10, 2162 }, 2163 2164 /* third group of endpoints */ 2165 .ep[11] = { 2166 .ep = { 2167 .name = "ep11in-bulk", 2168 .ops = &pxa25x_ep_ops, 2169 .maxpacket = BULK_FIFO_SIZE, 2170 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, 2171 USB_EP_CAPS_DIR_IN), 2172 }, 2173 .dev = &memory, 2174 .fifo_size = BULK_FIFO_SIZE, 2175 .bEndpointAddress = USB_DIR_IN | 11, 2176 .bmAttributes = USB_ENDPOINT_XFER_BULK, 2177 .regoff_udccs = UDCCS11, 2178 .regoff_uddr = UDDR11, 2179 }, 2180 .ep[12] = { 2181 .ep = { 2182 .name = "ep12out-bulk", 2183 .ops = &pxa25x_ep_ops, 2184 .maxpacket = BULK_FIFO_SIZE, 2185 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, 2186 USB_EP_CAPS_DIR_OUT), 2187 }, 2188 .dev = &memory, 2189 .fifo_size = BULK_FIFO_SIZE, 2190 .bEndpointAddress = 12, 2191 .bmAttributes = USB_ENDPOINT_XFER_BULK, 2192 .regoff_udccs = UDCCS12, 2193 .regoff_ubcr = UBCR12, 2194 .regoff_uddr = UDDR12, 2195 }, 2196 .ep[13] = { 2197 .ep = { 2198 .name = "ep13in-iso", 2199 .ops = &pxa25x_ep_ops, 2200 .maxpacket = ISO_FIFO_SIZE, 2201 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, 2202 USB_EP_CAPS_DIR_IN), 2203 }, 2204 .dev = &memory, 2205 .fifo_size = ISO_FIFO_SIZE, 2206 .bEndpointAddress = USB_DIR_IN | 13, 2207 .bmAttributes = USB_ENDPOINT_XFER_ISOC, 2208 .regoff_udccs = UDCCS13, 2209 .regoff_uddr = UDDR13, 2210 }, 2211 .ep[14] = { 2212 .ep = { 2213 .name = "ep14out-iso", 2214 .ops = &pxa25x_ep_ops, 2215 .maxpacket = ISO_FIFO_SIZE, 2216 .caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, 2217 USB_EP_CAPS_DIR_OUT), 2218 }, 2219 .dev = &memory, 2220 .fifo_size = ISO_FIFO_SIZE, 2221 .bEndpointAddress = 14, 2222 .bmAttributes = USB_ENDPOINT_XFER_ISOC, 2223 .regoff_udccs = UDCCS14, 2224 .regoff_ubcr = UBCR14, 2225 .regoff_uddr = UDDR14, 2226 }, 2227 .ep[15] = { 2228 .ep = { 2229 .name = "ep15in-int", 2230 .ops = &pxa25x_ep_ops, 2231 .maxpacket = INT_FIFO_SIZE, 2232 .caps = USB_EP_CAPS(0, 0), 2233 }, 2234 .dev = &memory, 2235 .fifo_size = INT_FIFO_SIZE, 2236 .bEndpointAddress = USB_DIR_IN | 15, 2237 .bmAttributes = USB_ENDPOINT_XFER_INT, 2238 .regoff_udccs = UDCCS15, 2239 .regoff_uddr = UDDR15, 2240 }, 2241#endif /* !CONFIG_USB_PXA25X_SMALL */ 2242}; 2243 2244#define CP15R0_VENDOR_MASK 0xffffe000 2245 2246#if defined(CONFIG_ARCH_PXA) 2247#define CP15R0_XSCALE_VALUE 0x69052000 /* intel/arm/xscale */ 2248 2249#elif defined(CONFIG_ARCH_IXP4XX) 2250#define CP15R0_XSCALE_VALUE 0x69054000 /* intel/arm/ixp4xx */ 2251 2252#endif 2253 2254#define CP15R0_PROD_MASK 0x000003f0 2255#define PXA25x 0x00000100 /* and PXA26x */ 2256#define PXA210 0x00000120 2257 2258#define CP15R0_REV_MASK 0x0000000f 2259 2260#define CP15R0_PRODREV_MASK (CP15R0_PROD_MASK | CP15R0_REV_MASK) 2261 2262#define PXA255_A0 0x00000106 /* or PXA260_B1 */ 2263#define PXA250_C0 0x00000105 /* or PXA26x_B0 */ 2264#define PXA250_B2 0x00000104 2265#define PXA250_B1 0x00000103 /* or PXA260_A0 */ 2266#define PXA250_B0 0x00000102 2267#define PXA250_A1 0x00000101 2268#define PXA250_A0 0x00000100 2269 2270#define PXA210_C0 0x00000125 2271#define PXA210_B2 0x00000124 2272#define PXA210_B1 0x00000123 2273#define PXA210_B0 0x00000122 2274#define IXP425_A0 0x000001c1 2275#define IXP425_B0 0x000001f1 2276#define IXP465_AD 0x00000200 2277 2278/* 2279 * probe - binds to the platform device 2280 */ 2281static int pxa25x_udc_probe(struct platform_device *pdev) 2282{ 2283 struct pxa25x_udc *dev = &memory; 2284 int retval, irq; 2285 u32 chiprev; 2286 2287 pr_info("%s: version %s\n", driver_name, DRIVER_VERSION); 2288 2289 /* insist on Intel/ARM/XScale */ 2290 asm("mrc p15, 0, %0, c0, c0" : "=r" (chiprev)); 2291 if ((chiprev & CP15R0_VENDOR_MASK) != CP15R0_XSCALE_VALUE) { 2292 pr_err("%s: not XScale!\n", driver_name); 2293 return -ENODEV; 2294 } 2295 2296 /* trigger chiprev-specific logic */ 2297 switch (chiprev & CP15R0_PRODREV_MASK) { 2298#if defined(CONFIG_ARCH_PXA) 2299 case PXA255_A0: 2300 dev->has_cfr = 1; 2301 break; 2302 case PXA250_A0: 2303 case PXA250_A1: 2304 /* A0/A1 "not released"; ep 13, 15 unusable */ 2305 fallthrough; 2306 case PXA250_B2: case PXA210_B2: 2307 case PXA250_B1: case PXA210_B1: 2308 case PXA250_B0: case PXA210_B0: 2309 /* OUT-DMA is broken ... */ 2310 fallthrough; 2311 case PXA250_C0: case PXA210_C0: 2312 break; 2313#elif defined(CONFIG_ARCH_IXP4XX) 2314 case IXP425_A0: 2315 case IXP425_B0: 2316 case IXP465_AD: 2317 dev->has_cfr = 1; 2318 break; 2319#endif 2320 default: 2321 pr_err("%s: unrecognized processor: %08x\n", 2322 driver_name, chiprev); 2323 /* iop3xx, ixp4xx, ... */ 2324 return -ENODEV; 2325 } 2326 2327 irq = platform_get_irq(pdev, 0); 2328 if (irq < 0) 2329 return irq; 2330 2331 dev->regs = devm_platform_ioremap_resource(pdev, 0); 2332 if (IS_ERR(dev->regs)) 2333 return PTR_ERR(dev->regs); 2334 2335 dev->clk = devm_clk_get(&pdev->dev, NULL); 2336 if (IS_ERR(dev->clk)) 2337 return PTR_ERR(dev->clk); 2338 2339 pr_debug("%s: IRQ %d%s%s\n", driver_name, irq, 2340 dev->has_cfr ? "" : " (!cfr)", 2341 SIZE_STR "(pio)" 2342 ); 2343 2344 /* other non-static parts of init */ 2345 dev->dev = &pdev->dev; 2346 dev->mach = dev_get_platdata(&pdev->dev); 2347 2348 dev->transceiver = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); 2349 2350 if (gpio_is_valid(dev->mach->gpio_pullup)) { 2351 retval = devm_gpio_request(&pdev->dev, dev->mach->gpio_pullup, 2352 "pca25x_udc GPIO PULLUP"); 2353 if (retval) { 2354 dev_dbg(&pdev->dev, 2355 "can't get pullup gpio %d, err: %d\n", 2356 dev->mach->gpio_pullup, retval); 2357 goto err; 2358 } 2359 gpio_direction_output(dev->mach->gpio_pullup, 0); 2360 } 2361 2362 timer_setup(&dev->timer, udc_watchdog, 0); 2363 2364 the_controller = dev; 2365 platform_set_drvdata(pdev, dev); 2366 2367 udc_disable(dev); 2368 udc_reinit(dev); 2369 2370 dev->vbus = 0; 2371 2372 /* irq setup after old hardware state is cleaned up */ 2373 retval = devm_request_irq(&pdev->dev, irq, pxa25x_udc_irq, 0, 2374 driver_name, dev); 2375 if (retval != 0) { 2376 pr_err("%s: can't get irq %d, err %d\n", 2377 driver_name, irq, retval); 2378 goto err; 2379 } 2380 dev->got_irq = 1; 2381 2382 create_debug_files(dev); 2383 2384 retval = usb_add_gadget_udc(&pdev->dev, &dev->gadget); 2385 if (!retval) 2386 return retval; 2387 2388 remove_debug_files(dev); 2389 err: 2390 if (!IS_ERR_OR_NULL(dev->transceiver)) 2391 dev->transceiver = NULL; 2392 return retval; 2393} 2394 2395static void pxa25x_udc_shutdown(struct platform_device *_dev) 2396{ 2397 pullup_off(); 2398} 2399 2400static void pxa25x_udc_remove(struct platform_device *pdev) 2401{ 2402 struct pxa25x_udc *dev = platform_get_drvdata(pdev); 2403 2404 if (dev->driver) { 2405 dev_err(&pdev->dev, 2406 "Driver still in use but removing anyhow\n"); 2407 return; 2408 } 2409 2410 usb_del_gadget_udc(&dev->gadget); 2411 dev->pullup = 0; 2412 pullup(dev); 2413 2414 remove_debug_files(dev); 2415 2416 if (!IS_ERR_OR_NULL(dev->transceiver)) 2417 dev->transceiver = NULL; 2418 2419 the_controller = NULL; 2420} 2421 2422/*-------------------------------------------------------------------------*/ 2423 2424#ifdef CONFIG_PM 2425 2426/* USB suspend (controlled by the host) and system suspend (controlled 2427 * by the PXA) don't necessarily work well together. If USB is active, 2428 * the 48 MHz clock is required; so the system can't enter 33 MHz idle 2429 * mode, or any deeper PM saving state. 2430 * 2431 * For now, we punt and forcibly disconnect from the USB host when PXA 2432 * enters any suspend state. While we're disconnected, we always disable 2433 * the 48MHz USB clock ... allowing PXA sleep and/or 33 MHz idle states. 2434 * Boards without software pullup control shouldn't use those states. 2435 * VBUS IRQs should probably be ignored so that the PXA device just acts 2436 * "dead" to USB hosts until system resume. 2437 */ 2438static int pxa25x_udc_suspend(struct platform_device *dev, pm_message_t state) 2439{ 2440 struct pxa25x_udc *udc = platform_get_drvdata(dev); 2441 unsigned long flags; 2442 2443 if (!gpio_is_valid(udc->mach->gpio_pullup) && !udc->mach->udc_command) 2444 WARNING("USB host won't detect disconnect!\n"); 2445 udc->suspended = 1; 2446 2447 local_irq_save(flags); 2448 pullup(udc); 2449 local_irq_restore(flags); 2450 2451 return 0; 2452} 2453 2454static int pxa25x_udc_resume(struct platform_device *dev) 2455{ 2456 struct pxa25x_udc *udc = platform_get_drvdata(dev); 2457 unsigned long flags; 2458 2459 udc->suspended = 0; 2460 local_irq_save(flags); 2461 pullup(udc); 2462 local_irq_restore(flags); 2463 2464 return 0; 2465} 2466 2467#else 2468#define pxa25x_udc_suspend NULL 2469#define pxa25x_udc_resume NULL 2470#endif 2471 2472/*-------------------------------------------------------------------------*/ 2473 2474static struct platform_driver udc_driver = { 2475 .shutdown = pxa25x_udc_shutdown, 2476 .probe = pxa25x_udc_probe, 2477 .remove_new = pxa25x_udc_remove, 2478 .suspend = pxa25x_udc_suspend, 2479 .resume = pxa25x_udc_resume, 2480 .driver = { 2481 .name = "pxa25x-udc", 2482 }, 2483}; 2484 2485module_platform_driver(udc_driver); 2486 2487MODULE_DESCRIPTION(DRIVER_DESC); 2488MODULE_AUTHOR("Frank Becker, Robert Schwebel, David Brownell"); 2489MODULE_LICENSE("GPL"); 2490MODULE_ALIAS("platform:pxa25x-udc"); 2491