drivers/usb/gadget/pxa2xx_udc.h

   1 /*
   2  * linux/drivers/usb/gadget/pxa2xx_udc.h
   3  * Intel PXA2xx on-chip full speed USB device controller
   4  *
   5  * Copyright (C) 2003 Robert Schwebel <r.schwebel@pengutronix.de>, Pengutronix
   6  * Copyright (C) 2003 David Brownell
   7  *
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #ifndef __LINUX_USB_GADGET_PXA2XX_H
  25 #define __LINUX_USB_GADGET_PXA2XX_H
  26
  27 #include <linux/types.h>
  28
  29 /*-------------------------------------------------------------------------*/
  30
  31 /* pxa2xx has this (move to include/asm-arm/arch-pxa/pxa-regs.h) */
  32 #define UFNRH_SIR       (1 << 7)        /* SOF interrupt request */
  33 #define UFNRH_SIM       (1 << 6)        /* SOF interrupt mask */
  34 #define UFNRH_IPE14     (1 << 5)        /* ISO packet error, ep14 */
  35 #define UFNRH_IPE9      (1 << 4)        /* ISO packet error, ep9 */
  36 #define UFNRH_IPE4      (1 << 3)        /* ISO packet error, ep4 */
  37
  38 /* pxa255 has this (move to include/asm-arm/arch-pxa/pxa-regs.h) */
  39 #define UDCCFR          UDC_RES2        /* UDC Control Function Register */
  40 #define UDCCFR_AREN     (1 << 7)        /* ACK response enable (now) */
  41 #define UDCCFR_ACM      (1 << 2)        /* ACK control mode (wait for AREN) */
  42
  43 /*-------------------------------------------------------------------------*/
  44
  45 struct pxa2xx_udc;
  46
  47 struct pxa2xx_ep {
  48         struct usb_ep                           ep;
  49         struct pxa2xx_udc                       *dev;
  50
  51         const struct usb_endpoint_descriptor    *desc;
  52         struct list_head                        queue;
  53         unsigned long                           pio_irqs;
  54         unsigned long                           dma_irqs;
  55         short                                   dma;
  56
  57         unsigned short                          fifo_size;
  58         u8                                      bEndpointAddress;
  59         u8                                      bmAttributes;
  60
  61         unsigned                                stopped : 1;
  62         unsigned                                dma_fixup : 1;
  63
  64         /* UDCCS = UDC Control/Status for this EP
  65          * UBCR = UDC Byte Count Remaining (contents of OUT fifo)
  66          * UDDR = UDC Endpoint Data Register (the fifo)
  67          * DRCM = DMA Request Channel Map
  68          */
  69         volatile u32                            *reg_udccs;
  70         volatile u32                            *reg_ubcr;
  71         volatile u32                            *reg_uddr;
  72 #ifdef USE_DMA
  73         volatile u32                            *reg_drcmr;
  74 #define drcmr(n)  .reg_drcmr = & DRCMR ## n ,
  75 #else
  76 #define drcmr(n)
  77 #endif
  78 };
  79
  80 struct pxa2xx_request {
  81         struct usb_request                      req;
  82         struct list_head                        queue;
  83 };
  84
  85 enum ep0_state {
  86         EP0_IDLE,
  87         EP0_IN_DATA_PHASE,
  88         EP0_OUT_DATA_PHASE,
  89         EP0_END_XFER,
  90         EP0_STALL,
  91 };
  92
  93 #define EP0_FIFO_SIZE   ((unsigned)16)
  94 #define BULK_FIFO_SIZE  ((unsigned)64)
  95 #define ISO_FIFO_SIZE   ((unsigned)256)
  96 #define INT_FIFO_SIZE   ((unsigned)8)
  97
  98 struct udc_stats {
  99         struct ep0stats {
 100                 unsigned long           ops;
 101                 unsigned long           bytes;
 102         } read, write;
 103         unsigned long                   irqs;
 104 };
 105
 106 #ifdef CONFIG_USB_PXA2XX_SMALL
 107 /* when memory's tight, SMALL config saves code+data.  */
 108 #undef  USE_DMA
 109 #define PXA_UDC_NUM_ENDPOINTS   3
 110 #endif
 111
 112 #ifndef PXA_UDC_NUM_ENDPOINTS
 113 #define PXA_UDC_NUM_ENDPOINTS   16
 114 #endif
 115
 116 struct pxa2xx_udc {
 117         struct usb_gadget                       gadget;
 118         struct usb_gadget_driver                *driver;
 119
 120         enum ep0_state                          ep0state;
 121         struct udc_stats                        stats;
 122         unsigned                                got_irq : 1,
 123                                                 got_disc : 1,
 124                                                 has_cfr : 1,
 125                                                 req_pending : 1,
 126                                                 req_std : 1,
 127                                                 req_config : 1;
 128
 129 #define start_watchdog(dev) mod_timer(&dev->timer, jiffies + (HZ/200))
 130         struct timer_list                       timer;
 131
 132         struct device                           *dev;
 133         struct pxa2xx_udc_mach_info             *mach;
 134         u64                                     dma_mask;
 135         struct pxa2xx_ep                        ep [PXA_UDC_NUM_ENDPOINTS];
 136 };
 137
 138 /*-------------------------------------------------------------------------*/
 139
 140 #ifdef CONFIG_ARCH_LUBBOCK
 141 #include <asm/arch/lubbock.h>
 142 /* lubbock can also report usb connect/disconnect irqs */
 143
 144 #ifdef DEBUG
 145 #define HEX_DISPLAY(n)  if (machine_is_lubbock()) { LUB_HEXLED = (n); }
 146
 147 #define LED_CONNECTED_ON        if (machine_is_lubbock()) { \
 148         DISCRETE_LED_ON(D26); }
 149 #define LED_CONNECTED_OFF       if(machine_is_lubbock()) { \
 150         DISCRETE_LED_OFF(D26); LUB_HEXLED = 0; }
 151 #define LED_EP0_ON      if (machine_is_lubbock()) { DISCRETE_LED_ON(D25); }
 152 #define LED_EP0_OFF     if (machine_is_lubbock()) { DISCRETE_LED_OFF(D25); }
 153 #endif /* DEBUG */
 154
 155 #endif
 156
 157 /*-------------------------------------------------------------------------*/
 158
 159 /* LEDs are only for debug */
 160 #ifndef HEX_DISPLAY
 161 #define HEX_DISPLAY(n)          do {} while(0)
 162 #endif
 163
 164 #ifndef LED_CONNECTED_ON
 165 #define LED_CONNECTED_ON        do {} while(0)
 166 #define LED_CONNECTED_OFF       do {} while(0)
 167 #endif
 168 #ifndef LED_EP0_ON
 169 #define LED_EP0_ON              do {} while (0)
 170 #define LED_EP0_OFF             do {} while (0)
 171 #endif
 172
 173 /*-------------------------------------------------------------------------*/
 174
 175 static struct pxa2xx_udc *the_controller;
 176
 177 /* one GPIO should be used to detect host disconnect */
 178 static inline int is_usb_connected(void)
 179 {
 180         if (!the_controller->mach->udc_is_connected)
 181                 return 1;
 182         return the_controller->mach->udc_is_connected();
 183 }
 184
 185 /* one GPIO should force the host to see this device (or not) */
 186 static inline void make_usb_disappear(void)
 187 {
 188         if (!the_controller->mach->udc_command)
 189                 return;
 190         the_controller->mach->udc_command(PXA2XX_UDC_CMD_DISCONNECT);
 191 }
 192
 193 static inline void let_usb_appear(void)
 194 {
 195         if (!the_controller->mach->udc_command)
 196                 return;
 197         the_controller->mach->udc_command(PXA2XX_UDC_CMD_CONNECT);
 198 }
 199
 200 /*-------------------------------------------------------------------------*/
 201
 202 /*
 203  * Debugging support vanishes in non-debug builds.  DBG_NORMAL should be
 204  * mostly silent during normal use/testing, with no timing side-effects.
 205  */
 206 #define DBG_NORMAL      1       /* error paths, device state transitions */
 207 #define DBG_VERBOSE     2       /* add some success path trace info */
 208 #define DBG_NOISY       3       /* ... even more: request level */
 209 #define DBG_VERY_NOISY  4       /* ... even more: packet level */
 210
 211 #ifdef DEBUG
 212
 213 static const char *state_name[] = {
 214         "EP0_IDLE",
 215         "EP0_IN_DATA_PHASE", "EP0_OUT_DATA_PHASE",
 216         "EP0_END_XFER", "EP0_STALL"
 217 };
 218
 219 #define DMSG(stuff...) printk(KERN_DEBUG "udc: " stuff)
 220
 221 #ifdef VERBOSE
 222 #    define UDC_DEBUG DBG_VERBOSE
 223 #else
 224 #    define UDC_DEBUG DBG_NORMAL
 225 #endif
 226
 227 static void __attribute__ ((__unused__))
 228 dump_udccr(const char *label)
 229 {
 230         u32     udccr = UDCCR;
 231         DMSG("%s %02X =%s%s%s%s%s%s%s%s\n",
 232                 label, udccr,
 233                 (udccr & UDCCR_REM) ? " rem" : "",
 234                 (udccr & UDCCR_RSTIR) ? " rstir" : "",
 235                 (udccr & UDCCR_SRM) ? " srm" : "",
 236                 (udccr & UDCCR_SUSIR) ? " susir" : "",
 237                 (udccr & UDCCR_RESIR) ? " resir" : "",
 238                 (udccr & UDCCR_RSM) ? " rsm" : "",
 239                 (udccr & UDCCR_UDA) ? " uda" : "",
 240                 (udccr & UDCCR_UDE) ? " ude" : "");
 241 }
 242
 243 static void __attribute__ ((__unused__))
 244 dump_udccs0(const char *label)
 245 {
 246         u32             udccs0 = UDCCS0;
 247
 248         DMSG("%s %s %02X =%s%s%s%s%s%s%s%s\n",
 249                 label, state_name[the_controller->ep0state], udccs0,
 250                 (udccs0 & UDCCS0_SA) ? " sa" : "",
 251                 (udccs0 & UDCCS0_RNE) ? " rne" : "",
 252                 (udccs0 & UDCCS0_FST) ? " fst" : "",
 253                 (udccs0 & UDCCS0_SST) ? " sst" : "",
 254                 (udccs0 & UDCCS0_DRWF) ? " dwrf" : "",
 255                 (udccs0 & UDCCS0_FTF) ? " ftf" : "",
 256                 (udccs0 & UDCCS0_IPR) ? " ipr" : "",
 257                 (udccs0 & UDCCS0_OPR) ? " opr" : "");
 258 }
 259
 260 static void __attribute__ ((__unused__))
 261 dump_state(struct pxa2xx_udc *dev)
 262 {
 263         u32             tmp;
 264         unsigned        i;
 265
 266         DMSG("%s %s, uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
 267                 is_usb_connected() ? "host " : "disconnected",
 268                 state_name[dev->ep0state],
 269                 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
 270         dump_udccr("udccr");
 271         if (dev->has_cfr) {
 272                 tmp = UDCCFR;
 273                 DMSG("udccfr %02X =%s%s\n", tmp,
 274                         (tmp & UDCCFR_AREN) ? " aren" : "",
 275                         (tmp & UDCCFR_ACM) ? " acm" : "");
 276         }
 277
 278         if (!dev->driver) {
 279                 DMSG("no gadget driver bound\n");
 280                 return;
 281         } else
 282                 DMSG("ep0 driver '%s'\n", dev->driver->driver.name);
 283
 284         if (!is_usb_connected())
 285                 return;
 286
 287         dump_udccs0 ("udccs0");
 288         DMSG("ep0 IN %lu/%lu, OUT %lu/%lu\n",
 289                 dev->stats.write.bytes, dev->stats.write.ops,
 290                 dev->stats.read.bytes, dev->stats.read.ops);
 291
 292         for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++) {
 293                 if (dev->ep [i].desc == 0)
 294                         continue;
 295                 DMSG ("udccs%d = %02x\n", i, *dev->ep->reg_udccs);
 296         }
 297 }
 298
 299 #else
 300
 301 #define DMSG(stuff...)          do{}while(0)
 302
 303 #define dump_udccr(x)   do{}while(0)
 304 #define dump_udccs0(x)  do{}while(0)
 305 #define dump_state(x)   do{}while(0)
 306
 307 #define UDC_DEBUG ((unsigned)0)
 308
 309 #endif
 310
 311 #define DBG(lvl, stuff...) do{if ((lvl) <= UDC_DEBUG) DMSG(stuff);}while(0)
 312
 313 #define WARN(stuff...) printk(KERN_WARNING "udc: " stuff)
 314 #define INFO(stuff...) printk(KERN_INFO "udc: " stuff)
 315
 316
 317 #endif /* __LINUX_USB_GADGET_PXA2XX_H */