kernel/drivers/usb/c67x00/c67x00-ll-hpi.c

   1 /*
   2  * c67x00-ll-hpi.c: Cypress C67X00 USB Low level interface using HPI
   3  *
   4  * Copyright (C) 2006-2008 Barco N.V.
   5  *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
   6  *    based on multiple host controller drivers inside the linux kernel.
   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 Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  21  * MA  02110-1301  USA.
  22  */
  23
  24 #include <asm/byteorder.h>
  25 #include <linux/delay.h>
  26 #include <linux/io.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/usb/c67x00.h>
  29 #include "c67x00.h"
  30
  31 #define COMM_REGS 14
  32
  33 struct c67x00_lcp_int_data {
  34         u16 regs[COMM_REGS];
  35 };
  36
  37 /* -------------------------------------------------------------------------- */
  38 /* Interface definitions */
  39
  40 #define COMM_ACK                        0x0FED
  41 #define COMM_NAK                        0xDEAD
  42
  43 #define COMM_RESET                      0xFA50
  44 #define COMM_EXEC_INT                   0xCE01
  45 #define COMM_INT_NUM                    0x01C2
  46
  47 /* Registers 0 to COMM_REGS-1 */
  48 #define COMM_R(x)                       (0x01C4 + 2 * (x))
  49
  50 #define HUSB_SIE_pCurrentTDPtr(x)       ((x) ? 0x01B2 : 0x01B0)
  51 #define HUSB_SIE_pTDListDone_Sem(x)     ((x) ? 0x01B8 : 0x01B6)
  52 #define HUSB_pEOT                       0x01B4
  53
  54 /* Software interrupts */
  55 /* 114, 115: */
  56 #define HUSB_SIE_INIT_INT(x)            ((x) ? 0x0073 : 0x0072)
  57 #define HUSB_RESET_INT                  0x0074
  58
  59 #define SUSB_INIT_INT                   0x0071
  60 #define SUSB_INIT_INT_LOC               (SUSB_INIT_INT * 2)
  61
  62 /* -----------------------------------------------------------------------
  63  * HPI implementation
  64  *
  65  * The c67x00 chip also support control via SPI or HSS serial
  66  * interfaces. However, this driver assumes that register access can
  67  * be performed from IRQ context. While this is a safe assumption with
  68  * the HPI interface, it is not true for the serial interfaces.
  69  */
  70
  71 /* HPI registers */
  72 #define HPI_DATA        0
  73 #define HPI_MAILBOX     1
  74 #define HPI_ADDR        2
  75 #define HPI_STATUS      3
  76
  77 /*
  78  * According to CY7C67300 specification (tables 140 and 141) HPI read and
  79  * write cycle duration Tcyc must be at least 6T long, where T is 1/48MHz,
  80  * which is 125ns.
  81  */
  82 #define HPI_T_CYC_NS    125
  83
  84 static inline u16 hpi_read_reg(struct c67x00_device *dev, int reg)
  85 {
  86         ndelay(HPI_T_CYC_NS);
  87         return __raw_readw(dev->hpi.base + reg * dev->hpi.regstep);
  88 }
  89
  90 static inline void hpi_write_reg(struct c67x00_device *dev, int reg, u16 value)
  91 {
  92         ndelay(HPI_T_CYC_NS);
  93         __raw_writew(value, dev->hpi.base + reg * dev->hpi.regstep);
  94 }
  95
  96 static inline u16 hpi_read_word_nolock(struct c67x00_device *dev, u16 reg)
  97 {
  98         hpi_write_reg(dev, HPI_ADDR, reg);
  99         return hpi_read_reg(dev, HPI_DATA);
 100 }
 101
 102 static u16 hpi_read_word(struct c67x00_device *dev, u16 reg)
 103 {
 104         u16 value;
 105         unsigned long flags;
 106
 107         spin_lock_irqsave(&dev->hpi.lock, flags);
 108         value = hpi_read_word_nolock(dev, reg);
 109         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 110
 111         return value;
 112 }
 113
 114 static void hpi_write_word_nolock(struct c67x00_device *dev, u16 reg, u16 value)
 115 {
 116         hpi_write_reg(dev, HPI_ADDR, reg);
 117         hpi_write_reg(dev, HPI_DATA, value);
 118 }
 119
 120 static void hpi_write_word(struct c67x00_device *dev, u16 reg, u16 value)
 121 {
 122         unsigned long flags;
 123
 124         spin_lock_irqsave(&dev->hpi.lock, flags);
 125         hpi_write_word_nolock(dev, reg, value);
 126         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 127 }
 128
 129 /*
 130  * Only data is little endian, addr has cpu endianess
 131  */
 132 static void hpi_write_words_le16(struct c67x00_device *dev, u16 addr,
 133                                  __le16 *data, u16 count)
 134 {
 135         unsigned long flags;
 136         int i;
 137
 138         spin_lock_irqsave(&dev->hpi.lock, flags);
 139
 140         hpi_write_reg(dev, HPI_ADDR, addr);
 141         for (i = 0; i < count; i++)
 142                 hpi_write_reg(dev, HPI_DATA, le16_to_cpu(*data++));
 143
 144         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 145 }
 146
 147 /*
 148  * Only data is little endian, addr has cpu endianess
 149  */
 150 static void hpi_read_words_le16(struct c67x00_device *dev, u16 addr,
 151                                 __le16 *data, u16 count)
 152 {
 153         unsigned long flags;
 154         int i;
 155
 156         spin_lock_irqsave(&dev->hpi.lock, flags);
 157         hpi_write_reg(dev, HPI_ADDR, addr);
 158         for (i = 0; i < count; i++)
 159                 *data++ = cpu_to_le16(hpi_read_reg(dev, HPI_DATA));
 160
 161         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 162 }
 163
 164 static void hpi_set_bits(struct c67x00_device *dev, u16 reg, u16 mask)
 165 {
 166         u16 value;
 167         unsigned long flags;
 168
 169         spin_lock_irqsave(&dev->hpi.lock, flags);
 170         value = hpi_read_word_nolock(dev, reg);
 171         hpi_write_word_nolock(dev, reg, value | mask);
 172         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 173 }
 174
 175 static void hpi_clear_bits(struct c67x00_device *dev, u16 reg, u16 mask)
 176 {
 177         u16 value;
 178         unsigned long flags;
 179
 180         spin_lock_irqsave(&dev->hpi.lock, flags);
 181         value = hpi_read_word_nolock(dev, reg);
 182         hpi_write_word_nolock(dev, reg, value & ~mask);
 183         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 184 }
 185
 186 static u16 hpi_recv_mbox(struct c67x00_device *dev)
 187 {
 188         u16 value;
 189         unsigned long flags;
 190
 191         spin_lock_irqsave(&dev->hpi.lock, flags);
 192         value = hpi_read_reg(dev, HPI_MAILBOX);
 193         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 194
 195         return value;
 196 }
 197
 198 static u16 hpi_send_mbox(struct c67x00_device *dev, u16 value)
 199 {
 200         unsigned long flags;
 201
 202         spin_lock_irqsave(&dev->hpi.lock, flags);
 203         hpi_write_reg(dev, HPI_MAILBOX, value);
 204         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 205
 206         return value;
 207 }
 208
 209 u16 c67x00_ll_hpi_status(struct c67x00_device *dev)
 210 {
 211         u16 value;
 212         unsigned long flags;
 213
 214         spin_lock_irqsave(&dev->hpi.lock, flags);
 215         value = hpi_read_reg(dev, HPI_STATUS);
 216         spin_unlock_irqrestore(&dev->hpi.lock, flags);
 217
 218         return value;
 219 }
 220
 221 void c67x00_ll_hpi_reg_init(struct c67x00_device *dev)
 222 {
 223         int i;
 224
 225         hpi_recv_mbox(dev);
 226         c67x00_ll_hpi_status(dev);
 227         hpi_write_word(dev, HPI_IRQ_ROUTING_REG, 0);
 228
 229         for (i = 0; i < C67X00_SIES; i++) {
 230                 hpi_write_word(dev, SIEMSG_REG(i), 0);
 231                 hpi_read_word(dev, SIEMSG_REG(i));
 232         }
 233 }
 234
 235 void c67x00_ll_hpi_enable_sofeop(struct c67x00_sie *sie)
 236 {
 237         hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
 238                      SOFEOP_TO_HPI_EN(sie->sie_num));
 239 }
 240
 241 void c67x00_ll_hpi_disable_sofeop(struct c67x00_sie *sie)
 242 {
 243         hpi_clear_bits(sie->dev, HPI_IRQ_ROUTING_REG,
 244                        SOFEOP_TO_HPI_EN(sie->sie_num));
 245 }
 246
 247 /* -------------------------------------------------------------------------- */
 248 /* Transactions */
 249
 250 static inline int ll_recv_msg(struct c67x00_device *dev)
 251 {
 252         u16 res;
 253
 254         res = wait_for_completion_timeout(&dev->hpi.lcp.msg_received, 5 * HZ);
 255         WARN_ON(!res);
 256
 257         return (res == 0) ? -EIO : 0;
 258 }
 259
 260 /* -------------------------------------------------------------------------- */
 261 /* General functions */
 262
 263 u16 c67x00_ll_fetch_siemsg(struct c67x00_device *dev, int sie_num)
 264 {
 265         u16 val;
 266
 267         val = hpi_read_word(dev, SIEMSG_REG(sie_num));
 268         /* clear register to allow next message */
 269         hpi_write_word(dev, SIEMSG_REG(sie_num), 0);
 270
 271         return val;
 272 }
 273
 274 u16 c67x00_ll_get_usb_ctl(struct c67x00_sie *sie)
 275 {
 276         return hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num));
 277 }
 278
 279 /**
 280  * c67x00_ll_usb_clear_status - clear the USB status bits
 281  */
 282 void c67x00_ll_usb_clear_status(struct c67x00_sie *sie, u16 bits)
 283 {
 284         hpi_write_word(sie->dev, USB_STAT_REG(sie->sie_num), bits);
 285 }
 286
 287 u16 c67x00_ll_usb_get_status(struct c67x00_sie *sie)
 288 {
 289         return hpi_read_word(sie->dev, USB_STAT_REG(sie->sie_num));
 290 }
 291
 292 /* -------------------------------------------------------------------------- */
 293
 294 static int c67x00_comm_exec_int(struct c67x00_device *dev, u16 nr,
 295                                 struct c67x00_lcp_int_data *data)
 296 {
 297         int i, rc;
 298
 299         mutex_lock(&dev->hpi.lcp.mutex);
 300         hpi_write_word(dev, COMM_INT_NUM, nr);
 301         for (i = 0; i < COMM_REGS; i++)
 302                 hpi_write_word(dev, COMM_R(i), data->regs[i]);
 303         hpi_send_mbox(dev, COMM_EXEC_INT);
 304         rc = ll_recv_msg(dev);
 305         mutex_unlock(&dev->hpi.lcp.mutex);
 306
 307         return rc;
 308 }
 309
 310 /* -------------------------------------------------------------------------- */
 311 /* Host specific functions */
 312
 313 void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value)
 314 {
 315         mutex_lock(&dev->hpi.lcp.mutex);
 316         hpi_write_word(dev, HUSB_pEOT, value);
 317         mutex_unlock(&dev->hpi.lcp.mutex);
 318 }
 319
 320 static inline void c67x00_ll_husb_sie_init(struct c67x00_sie *sie)
 321 {
 322         struct c67x00_device *dev = sie->dev;
 323         struct c67x00_lcp_int_data data;
 324         int rc;
 325
 326         rc = c67x00_comm_exec_int(dev, HUSB_SIE_INIT_INT(sie->sie_num), &data);
 327         BUG_ON(rc); /* No return path for error code; crash spectacularly */
 328 }
 329
 330 void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port)
 331 {
 332         struct c67x00_device *dev = sie->dev;
 333         struct c67x00_lcp_int_data data;
 334         int rc;
 335
 336         data.regs[0] = 50;      /* Reset USB port for 50ms */
 337         data.regs[1] = port | (sie->sie_num << 1);
 338         rc = c67x00_comm_exec_int(dev, HUSB_RESET_INT, &data);
 339         BUG_ON(rc); /* No return path for error code; crash spectacularly */
 340 }
 341
 342 void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr)
 343 {
 344         hpi_write_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num), addr);
 345 }
 346
 347 u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie)
 348 {
 349         return hpi_read_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num));
 350 }
 351
 352 u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie)
 353 {
 354         return hpi_read_word(sie->dev, HOST_FRAME_REG(sie->sie_num));
 355 }
 356
 357 void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie)
 358 {
 359         /* Set port into host mode */
 360         hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), HOST_MODE);
 361         c67x00_ll_husb_sie_init(sie);
 362         /* Clear interrupts */
 363         c67x00_ll_usb_clear_status(sie, HOST_STAT_MASK);
 364         /* Check */
 365         if (!(hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num)) & HOST_MODE))
 366                 dev_warn(sie_dev(sie),
 367                          "SIE %d not set to host mode\n", sie->sie_num);
 368 }
 369
 370 void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port)
 371 {
 372         /* Clear connect change */
 373         c67x00_ll_usb_clear_status(sie, PORT_CONNECT_CHANGE(port));
 374
 375         /* Enable interrupts */
 376         hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
 377                      SOFEOP_TO_CPU_EN(sie->sie_num));
 378         hpi_set_bits(sie->dev, HOST_IRQ_EN_REG(sie->sie_num),
 379                      SOF_EOP_IRQ_EN | DONE_IRQ_EN);
 380
 381         /* Enable pull down transistors */
 382         hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), PORT_RES_EN(port));
 383 }
 384
 385 /* -------------------------------------------------------------------------- */
 386
 387 void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status)
 388 {
 389         if ((int_status & MBX_OUT_FLG) == 0)
 390                 return;
 391
 392         dev->hpi.lcp.last_msg = hpi_recv_mbox(dev);
 393         complete(&dev->hpi.lcp.msg_received);
 394 }
 395
 396 /* -------------------------------------------------------------------------- */
 397
 398 int c67x00_ll_reset(struct c67x00_device *dev)
 399 {
 400         int rc;
 401
 402         mutex_lock(&dev->hpi.lcp.mutex);
 403         hpi_send_mbox(dev, COMM_RESET);
 404         rc = ll_recv_msg(dev);
 405         mutex_unlock(&dev->hpi.lcp.mutex);
 406
 407         return rc;
 408 }
 409
 410 /* -------------------------------------------------------------------------- */
 411
 412 /**
 413  * c67x00_ll_write_mem_le16 - write into c67x00 memory
 414  * Only data is little endian, addr has cpu endianess.
 415  */
 416 void c67x00_ll_write_mem_le16(struct c67x00_device *dev, u16 addr,
 417                               void *data, int len)
 418 {
 419         u8 *buf = data;
 420
 421         /* Sanity check */
 422         if (addr + len > 0xffff) {
 423                 dev_err(&dev->pdev->dev,
 424                         "Trying to write beyond writable region!\n");
 425                 return;
 426         }
 427
 428         if (addr & 0x01) {
 429                 /* unaligned access */
 430                 u16 tmp;
 431                 tmp = hpi_read_word(dev, addr - 1);
 432                 tmp = (tmp & 0x00ff) | (*buf++ << 8);
 433                 hpi_write_word(dev, addr - 1, tmp);
 434                 addr++;
 435                 len--;
 436         }
 437
 438         hpi_write_words_le16(dev, addr, (__le16 *)buf, len / 2);
 439         buf += len & ~0x01;
 440         addr += len & ~0x01;
 441         len &= 0x01;
 442
 443         if (len) {
 444                 u16 tmp;
 445                 tmp = hpi_read_word(dev, addr);
 446                 tmp = (tmp & 0xff00) | *buf;
 447                 hpi_write_word(dev, addr, tmp);
 448         }
 449 }
 450
 451 /**
 452  * c67x00_ll_read_mem_le16 - read from c67x00 memory
 453  * Only data is little endian, addr has cpu endianess.
 454  */
 455 void c67x00_ll_read_mem_le16(struct c67x00_device *dev, u16 addr,
 456                              void *data, int len)
 457 {
 458         u8 *buf = data;
 459
 460         if (addr & 0x01) {
 461                 /* unaligned access */
 462                 u16 tmp;
 463                 tmp = hpi_read_word(dev, addr - 1);
 464                 *buf++ = (tmp >> 8) & 0x00ff;
 465                 addr++;
 466                 len--;
 467         }
 468
 469         hpi_read_words_le16(dev, addr, (__le16 *)buf, len / 2);
 470         buf += len & ~0x01;
 471         addr += len & ~0x01;
 472         len &= 0x01;
 473
 474         if (len) {
 475                 u16 tmp;
 476                 tmp = hpi_read_word(dev, addr);
 477                 *buf = tmp & 0x00ff;
 478         }
 479 }
 480
 481 /* -------------------------------------------------------------------------- */
 482
 483 void c67x00_ll_init(struct c67x00_device *dev)
 484 {
 485         mutex_init(&dev->hpi.lcp.mutex);
 486         init_completion(&dev->hpi.lcp.msg_received);
 487 }
 488
 489 void c67x00_ll_release(struct c67x00_device *dev)
 490 {
 491 }