1/* 2 * MSM MDDI Transport 3 * 4 * Copyright (C) 2007 Google Incorporated 5 * Copyright (C) 2007 QUALCOMM Incorporated 6 * 7 * This software is licensed under the terms of the GNU General Public 8 * License version 2, as published by the Free Software Foundation, and 9 * may be copied, distributed, and modified under those terms. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 */ 17 18#include <linux/module.h> 19#include <linux/kernel.h> 20#include <linux/dma-mapping.h> 21#include <linux/interrupt.h> 22#include <linux/platform_device.h> 23#include <linux/delay.h> 24#include <linux/gfp.h> 25#include <linux/spinlock.h> 26#include <linux/clk.h> 27#include <linux/io.h> 28#include <linux/sched.h> 29#include <mach/msm_iomap.h> 30#include <mach/irqs.h> 31#include <mach/board.h> 32#include <mach/msm_fb.h> 33#include "mddi_hw.h" 34 35#define FLAG_DISABLE_HIBERNATION 0x0001 36#define FLAG_HAVE_CAPS 0x0002 37#define FLAG_HAS_VSYNC_IRQ 0x0004 38#define FLAG_HAVE_STATUS 0x0008 39 40#define CMD_GET_CLIENT_CAP 0x0601 41#define CMD_GET_CLIENT_STATUS 0x0602 42 43union mddi_rev { 44 unsigned char raw[MDDI_REV_BUFFER_SIZE]; 45 struct mddi_rev_packet hdr; 46 struct mddi_client_status status; 47 struct mddi_client_caps caps; 48 struct mddi_register_access reg; 49}; 50 51struct reg_read_info { 52 struct completion done; 53 uint32_t reg; 54 uint32_t status; 55 uint32_t result; 56}; 57 58struct mddi_info { 59 uint16_t flags; 60 uint16_t version; 61 char __iomem *base; 62 int irq; 63 struct clk *clk; 64 struct msm_mddi_client_data client_data; 65 66 /* buffer for rev encap packets */ 67 void *rev_data; 68 dma_addr_t rev_addr; 69 struct mddi_llentry *reg_write_data; 70 dma_addr_t reg_write_addr; 71 struct mddi_llentry *reg_read_data; 72 dma_addr_t reg_read_addr; 73 size_t rev_data_curr; 74 75 spinlock_t int_lock; 76 uint32_t int_enable; 77 uint32_t got_int; 78 wait_queue_head_t int_wait; 79 80 struct mutex reg_write_lock; 81 struct mutex reg_read_lock; 82 struct reg_read_info *reg_read; 83 84 struct mddi_client_caps caps; 85 struct mddi_client_status status; 86 87 void (*power_client)(struct msm_mddi_client_data *, int); 88 89 /* client device published to bind us to the 90 * appropriate mddi_client driver 91 */ 92 char client_name[20]; 93 94 struct platform_device client_pdev; 95}; 96 97static void mddi_init_rev_encap(struct mddi_info *mddi); 98 99#define mddi_readl(r) readl(mddi->base + (MDDI_##r)) 100#define mddi_writel(v, r) writel((v), mddi->base + (MDDI_##r)) 101 102void mddi_activate_link(struct msm_mddi_client_data *cdata) 103{ 104 struct mddi_info *mddi = container_of(cdata, struct mddi_info, 105 client_data); 106 107 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD); 108} 109 110static void mddi_handle_link_list_done(struct mddi_info *mddi) 111{ 112} 113 114static void mddi_reset_rev_encap_ptr(struct mddi_info *mddi) 115{ 116 printk(KERN_INFO "mddi: resetting rev ptr\n"); 117 mddi->rev_data_curr = 0; 118 mddi_writel(mddi->rev_addr, REV_PTR); 119 mddi_writel(mddi->rev_addr, REV_PTR); 120 mddi_writel(MDDI_CMD_FORCE_NEW_REV_PTR, CMD); 121} 122 123static void mddi_handle_rev_data(struct mddi_info *mddi, union mddi_rev *rev) 124{ 125 int i; 126 struct reg_read_info *ri; 127 128 if ((rev->hdr.length <= MDDI_REV_BUFFER_SIZE - 2) && 129 (rev->hdr.length >= sizeof(struct mddi_rev_packet) - 2)) { 130 131 switch (rev->hdr.type) { 132 case TYPE_CLIENT_CAPS: 133 memcpy(&mddi->caps, &rev->caps, 134 sizeof(struct mddi_client_caps)); 135 mddi->flags |= FLAG_HAVE_CAPS; 136 wake_up(&mddi->int_wait); 137 break; 138 case TYPE_CLIENT_STATUS: 139 memcpy(&mddi->status, &rev->status, 140 sizeof(struct mddi_client_status)); 141 mddi->flags |= FLAG_HAVE_STATUS; 142 wake_up(&mddi->int_wait); 143 break; 144 case TYPE_REGISTER_ACCESS: 145 ri = mddi->reg_read; 146 if (ri == 0) { 147 printk(KERN_INFO "rev: got reg %x = %x without " 148 " pending read\n", 149 rev->reg.register_address, 150 rev->reg.register_data_list); 151 break; 152 } 153 if (ri->reg != rev->reg.register_address) { 154 printk(KERN_INFO "rev: got reg %x = %x for " 155 "wrong register, expected " 156 "%x\n", 157 rev->reg.register_address, 158 rev->reg.register_data_list, ri->reg); 159 break; 160 } 161 mddi->reg_read = NULL; 162 ri->status = 0; 163 ri->result = rev->reg.register_data_list; 164 complete(&ri->done); 165 break; 166 default: 167 printk(KERN_INFO "rev: unknown reverse packet: " 168 "len=%04x type=%04x CURR_REV_PTR=%x\n", 169 rev->hdr.length, rev->hdr.type, 170 mddi_readl(CURR_REV_PTR)); 171 for (i = 0; i < rev->hdr.length + 2; i++) { 172 if ((i % 16) == 0) 173 printk(KERN_INFO "\n"); 174 printk(KERN_INFO " %02x", rev->raw[i]); 175 } 176 printk(KERN_INFO "\n"); 177 mddi_reset_rev_encap_ptr(mddi); 178 } 179 } else { 180 printk(KERN_INFO "bad rev length, %d, CURR_REV_PTR %x\n", 181 rev->hdr.length, mddi_readl(CURR_REV_PTR)); 182 mddi_reset_rev_encap_ptr(mddi); 183 } 184} 185 186static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask); 187 188static void mddi_handle_rev_data_avail(struct mddi_info *mddi) 189{ 190 uint32_t rev_data_count; 191 uint32_t rev_crc_err_count; 192 struct reg_read_info *ri; 193 size_t prev_offset; 194 uint16_t length; 195 196 union mddi_rev *crev = mddi->rev_data + mddi->rev_data_curr; 197 198 /* clear the interrupt */ 199 mddi_writel(MDDI_INT_REV_DATA_AVAIL, INT); 200 rev_data_count = mddi_readl(REV_PKT_CNT); 201 rev_crc_err_count = mddi_readl(REV_CRC_ERR); 202 if (rev_data_count > 1) 203 printk(KERN_INFO "rev_data_count %d\n", rev_data_count); 204 205 if (rev_crc_err_count) { 206 printk(KERN_INFO "rev_crc_err_count %d, INT %x\n", 207 rev_crc_err_count, mddi_readl(INT)); 208 ri = mddi->reg_read; 209 if (ri == 0) { 210 printk(KERN_INFO "rev: got crc error without pending " 211 "read\n"); 212 } else { 213 mddi->reg_read = NULL; 214 ri->status = -EIO; 215 ri->result = -1; 216 complete(&ri->done); 217 } 218 } 219 220 if (rev_data_count == 0) 221 return; 222 223 prev_offset = mddi->rev_data_curr; 224 225 length = *((uint8_t *)mddi->rev_data + mddi->rev_data_curr); 226 mddi->rev_data_curr++; 227 if (mddi->rev_data_curr == MDDI_REV_BUFFER_SIZE) 228 mddi->rev_data_curr = 0; 229 length += *((uint8_t *)mddi->rev_data + mddi->rev_data_curr) << 8; 230 mddi->rev_data_curr += 1 + length; 231 if (mddi->rev_data_curr >= MDDI_REV_BUFFER_SIZE) 232 mddi->rev_data_curr = 233 mddi->rev_data_curr % MDDI_REV_BUFFER_SIZE; 234 235 if (length > MDDI_REV_BUFFER_SIZE - 2) { 236 printk(KERN_INFO "mddi: rev data length greater than buffer" 237 "size\n"); 238 mddi_reset_rev_encap_ptr(mddi); 239 return; 240 } 241 242 if (prev_offset + 2 + length >= MDDI_REV_BUFFER_SIZE) { 243 union mddi_rev tmprev; 244 size_t rem = MDDI_REV_BUFFER_SIZE - prev_offset; 245 memcpy(&tmprev.raw[0], mddi->rev_data + prev_offset, rem); 246 memcpy(&tmprev.raw[rem], mddi->rev_data, 2 + length - rem); 247 mddi_handle_rev_data(mddi, &tmprev); 248 } else { 249 mddi_handle_rev_data(mddi, crev); 250 } 251 252 if (prev_offset < MDDI_REV_BUFFER_SIZE / 2 && 253 mddi->rev_data_curr >= MDDI_REV_BUFFER_SIZE / 2) { 254 mddi_writel(mddi->rev_addr, REV_PTR); 255 } 256} 257 258static irqreturn_t mddi_isr(int irq, void *data) 259{ 260 struct msm_mddi_client_data *cdata = data; 261 struct mddi_info *mddi = container_of(cdata, struct mddi_info, 262 client_data); 263 uint32_t active, status; 264 265 spin_lock(&mddi->int_lock); 266 267 active = mddi_readl(INT); 268 status = mddi_readl(STAT); 269 270 mddi_writel(active, INT); 271 272 /* ignore any interrupts we have disabled */ 273 active &= mddi->int_enable; 274 275 mddi->got_int |= active; 276 wake_up(&mddi->int_wait); 277 278 if (active & MDDI_INT_PRI_LINK_LIST_DONE) { 279 mddi->int_enable &= (~MDDI_INT_PRI_LINK_LIST_DONE); 280 mddi_handle_link_list_done(mddi); 281 } 282 if (active & MDDI_INT_REV_DATA_AVAIL) 283 mddi_handle_rev_data_avail(mddi); 284 285 if (active & ~MDDI_INT_NEED_CLEAR) 286 mddi->int_enable &= ~(active & ~MDDI_INT_NEED_CLEAR); 287 288 if (active & MDDI_INT_LINK_ACTIVE) { 289 mddi->int_enable &= (~MDDI_INT_LINK_ACTIVE); 290 mddi->int_enable |= MDDI_INT_IN_HIBERNATION; 291 } 292 293 if (active & MDDI_INT_IN_HIBERNATION) { 294 mddi->int_enable &= (~MDDI_INT_IN_HIBERNATION); 295 mddi->int_enable |= MDDI_INT_LINK_ACTIVE; 296 } 297 298 mddi_writel(mddi->int_enable, INTEN); 299 spin_unlock(&mddi->int_lock); 300 301 return IRQ_HANDLED; 302} 303 304static long mddi_wait_interrupt_timeout(struct mddi_info *mddi, 305 uint32_t intmask, int timeout) 306{ 307 unsigned long irq_flags; 308 309 spin_lock_irqsave(&mddi->int_lock, irq_flags); 310 mddi->got_int &= ~intmask; 311 mddi->int_enable |= intmask; 312 mddi_writel(mddi->int_enable, INTEN); 313 spin_unlock_irqrestore(&mddi->int_lock, irq_flags); 314 return wait_event_timeout(mddi->int_wait, mddi->got_int & intmask, 315 timeout); 316} 317 318static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask) 319{ 320 if (mddi_wait_interrupt_timeout(mddi, intmask, HZ/10) == 0) 321 printk(KERN_INFO KERN_ERR "mddi_wait_interrupt %d, timeout " 322 "waiting for %x, INT = %x, STAT = %x gotint = %x\n", 323 current->pid, intmask, mddi_readl(INT), mddi_readl(STAT), 324 mddi->got_int); 325} 326 327static void mddi_init_rev_encap(struct mddi_info *mddi) 328{ 329 memset(mddi->rev_data, 0xee, MDDI_REV_BUFFER_SIZE); 330 mddi_writel(mddi->rev_addr, REV_PTR); 331 mddi_writel(MDDI_CMD_FORCE_NEW_REV_PTR, CMD); 332 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 333} 334 335void mddi_set_auto_hibernate(struct msm_mddi_client_data *cdata, int on) 336{ 337 struct mddi_info *mddi = container_of(cdata, struct mddi_info, 338 client_data); 339 mddi_writel(MDDI_CMD_POWERDOWN, CMD); 340 mddi_wait_interrupt(mddi, MDDI_INT_IN_HIBERNATION); 341 mddi_writel(MDDI_CMD_HIBERNATE | !!on, CMD); 342 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 343} 344 345 346static uint16_t mddi_init_registers(struct mddi_info *mddi) 347{ 348 mddi_writel(0x0001, VERSION); 349 mddi_writel(MDDI_HOST_BYTES_PER_SUBFRAME, BPS); 350 mddi_writel(0x0003, SPM); /* subframes per media */ 351 mddi_writel(0x0005, TA1_LEN); 352 mddi_writel(MDDI_HOST_TA2_LEN, TA2_LEN); 353 mddi_writel(0x0096, DRIVE_HI); 354 /* 0x32 normal, 0x50 for Toshiba display */ 355 mddi_writel(0x0050, DRIVE_LO); 356 mddi_writel(0x003C, DISP_WAKE); /* wakeup counter */ 357 mddi_writel(MDDI_HOST_REV_RATE_DIV, REV_RATE_DIV); 358 359 mddi_writel(MDDI_REV_BUFFER_SIZE, REV_SIZE); 360 mddi_writel(MDDI_MAX_REV_PKT_SIZE, REV_ENCAP_SZ); 361 362 /* disable periodic rev encap */ 363 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP, CMD); 364 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 365 366 if (mddi_readl(PAD_CTL) == 0) { 367 /* If we are turning on band gap, need to wait 5us before 368 * turning on the rest of the PAD */ 369 mddi_writel(0x08000, PAD_CTL); 370 udelay(5); 371 } 372 373 /* Recommendation from PAD hw team */ 374 mddi_writel(0xa850f, PAD_CTL); 375 376 377 /* Need an even number for counts */ 378 mddi_writel(0x60006, DRIVER_START_CNT); 379 380 mddi_set_auto_hibernate(&mddi->client_data, 0); 381 382 mddi_writel(MDDI_CMD_DISP_IGNORE, CMD); 383 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 384 385 mddi_init_rev_encap(mddi); 386 return mddi_readl(CORE_VER) & 0xffff; 387} 388 389static void mddi_suspend(struct msm_mddi_client_data *cdata) 390{ 391 struct mddi_info *mddi = container_of(cdata, struct mddi_info, 392 client_data); 393 /* turn off the client */ 394 if (mddi->power_client) 395 mddi->power_client(&mddi->client_data, 0); 396 /* turn off the link */ 397 mddi_writel(MDDI_CMD_RESET, CMD); 398 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 399 /* turn off the clock */ 400 clk_disable(mddi->clk); 401} 402 403static void mddi_resume(struct msm_mddi_client_data *cdata) 404{ 405 struct mddi_info *mddi = container_of(cdata, struct mddi_info, 406 client_data); 407 mddi_set_auto_hibernate(&mddi->client_data, 0); 408 /* turn on the client */ 409 if (mddi->power_client) 410 mddi->power_client(&mddi->client_data, 1); 411 /* turn on the clock */ 412 clk_enable(mddi->clk); 413 /* set up the local registers */ 414 mddi->rev_data_curr = 0; 415 mddi_init_registers(mddi); 416 mddi_writel(mddi->int_enable, INTEN); 417 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD); 418 mddi_writel(MDDI_CMD_SEND_RTD, CMD); 419 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 420 mddi_set_auto_hibernate(&mddi->client_data, 1); 421} 422 423static int __init mddi_get_client_caps(struct mddi_info *mddi) 424{ 425 int i, j; 426 427 /* clear any stale interrupts */ 428 mddi_writel(0xffffffff, INT); 429 430 mddi->int_enable = MDDI_INT_LINK_ACTIVE | 431 MDDI_INT_IN_HIBERNATION | 432 MDDI_INT_PRI_LINK_LIST_DONE | 433 MDDI_INT_REV_DATA_AVAIL | 434 MDDI_INT_REV_OVERFLOW | 435 MDDI_INT_REV_OVERWRITE | 436 MDDI_INT_RTD_FAILURE; 437 mddi_writel(mddi->int_enable, INTEN); 438 439 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD); 440 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 441 442 for (j = 0; j < 3; j++) { 443 /* the toshiba vga panel does not respond to get 444 * caps unless you SEND_RTD, but the first SEND_RTD 445 * will fail... 446 */ 447 for (i = 0; i < 4; i++) { 448 uint32_t stat; 449 450 mddi_writel(MDDI_CMD_SEND_RTD, CMD); 451 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 452 stat = mddi_readl(STAT); 453 printk(KERN_INFO "mddi cmd send rtd: int %x, stat %x, " 454 "rtd val %x\n", mddi_readl(INT), stat, 455 mddi_readl(RTD_VAL)); 456 if ((stat & MDDI_STAT_RTD_MEAS_FAIL) == 0) 457 break; 458 msleep(1); 459 } 460 461 mddi_writel(CMD_GET_CLIENT_CAP, CMD); 462 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 463 wait_event_timeout(mddi->int_wait, mddi->flags & FLAG_HAVE_CAPS, 464 HZ / 100); 465 466 if (mddi->flags & FLAG_HAVE_CAPS) 467 break; 468 printk(KERN_INFO KERN_ERR "mddi_init, timeout waiting for " 469 "caps\n"); 470 } 471 return mddi->flags & FLAG_HAVE_CAPS; 472} 473 474/* link must be active when this is called */ 475int mddi_check_status(struct mddi_info *mddi) 476{ 477 int ret = -1, retry = 3; 478 mutex_lock(&mddi->reg_read_lock); 479 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 1, CMD); 480 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 481 482 do { 483 mddi->flags &= ~FLAG_HAVE_STATUS; 484 mddi_writel(CMD_GET_CLIENT_STATUS, CMD); 485 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 486 wait_event_timeout(mddi->int_wait, 487 mddi->flags & FLAG_HAVE_STATUS, 488 HZ / 100); 489 490 if (mddi->flags & FLAG_HAVE_STATUS) { 491 if (mddi->status.crc_error_count) 492 printk(KERN_INFO "mddi status: crc_error " 493 "count: %d\n", 494 mddi->status.crc_error_count); 495 else 496 ret = 0; 497 break; 498 } else 499 printk(KERN_INFO "mddi status: failed to get client " 500 "status\n"); 501 mddi_writel(MDDI_CMD_SEND_RTD, CMD); 502 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 503 } while (--retry); 504 505 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 0, CMD); 506 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 507 mutex_unlock(&mddi->reg_read_lock); 508 return ret; 509} 510 511 512void mddi_remote_write(struct msm_mddi_client_data *cdata, uint32_t val, 513 uint32_t reg) 514{ 515 struct mddi_info *mddi = container_of(cdata, struct mddi_info, 516 client_data); 517 struct mddi_llentry *ll; 518 struct mddi_register_access *ra; 519 520 mutex_lock(&mddi->reg_write_lock); 521 522 ll = mddi->reg_write_data; 523 524 ra = &(ll->u.r); 525 ra->length = 14 + 4; 526 ra->type = TYPE_REGISTER_ACCESS; 527 ra->client_id = 0; 528 ra->read_write_info = MDDI_WRITE | 1; 529 ra->crc16 = 0; 530 531 ra->register_address = reg; 532 ra->register_data_list = val; 533 534 ll->flags = 1; 535 ll->header_count = 14; 536 ll->data_count = 4; 537 ll->data = mddi->reg_write_addr + offsetof(struct mddi_llentry, 538 u.r.register_data_list); 539 ll->next = 0; 540 ll->reserved = 0; 541 542 mddi_writel(mddi->reg_write_addr, PRI_PTR); 543 544 mddi_wait_interrupt(mddi, MDDI_INT_PRI_LINK_LIST_DONE); 545 mutex_unlock(&mddi->reg_write_lock); 546} 547 548uint32_t mddi_remote_read(struct msm_mddi_client_data *cdata, uint32_t reg) 549{ 550 struct mddi_info *mddi = container_of(cdata, struct mddi_info, 551 client_data); 552 struct mddi_llentry *ll; 553 struct mddi_register_access *ra; 554 struct reg_read_info ri; 555 unsigned s; 556 int retry_count = 2; 557 unsigned long irq_flags; 558 559 mutex_lock(&mddi->reg_read_lock); 560 561 ll = mddi->reg_read_data; 562 563 ra = &(ll->u.r); 564 ra->length = 14; 565 ra->type = TYPE_REGISTER_ACCESS; 566 ra->client_id = 0; 567 ra->read_write_info = MDDI_READ | 1; 568 ra->crc16 = 0; 569 570 ra->register_address = reg; 571 572 ll->flags = 0x11; 573 ll->header_count = 14; 574 ll->data_count = 0; 575 ll->data = 0; 576 ll->next = 0; 577 ll->reserved = 0; 578 579 s = mddi_readl(STAT); 580 581 ri.reg = reg; 582 ri.status = -1; 583 584 do { 585 init_completion(&ri.done); 586 mddi->reg_read = &ri; 587 mddi_writel(mddi->reg_read_addr, PRI_PTR); 588 589 mddi_wait_interrupt(mddi, MDDI_INT_PRI_LINK_LIST_DONE); 590 591 /* Enable Periodic Reverse Encapsulation. */ 592 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 1, CMD); 593 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 594 if (wait_for_completion_timeout(&ri.done, HZ/10) == 0 && 595 !ri.done.done) { 596 printk(KERN_INFO "mddi_remote_read(%x) timeout " 597 "(%d %d %d)\n", 598 reg, ri.status, ri.result, ri.done.done); 599 spin_lock_irqsave(&mddi->int_lock, irq_flags); 600 mddi->reg_read = NULL; 601 spin_unlock_irqrestore(&mddi->int_lock, irq_flags); 602 ri.status = -1; 603 ri.result = -1; 604 } 605 if (ri.status == 0) 606 break; 607 608 mddi_writel(MDDI_CMD_SEND_RTD, CMD); 609 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD); 610 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 611 printk(KERN_INFO "mddi_remote_read: failed, sent " 612 "MDDI_CMD_SEND_RTD: int %x, stat %x, rtd val %x " 613 "curr_rev_ptr %x\n", mddi_readl(INT), mddi_readl(STAT), 614 mddi_readl(RTD_VAL), mddi_readl(CURR_REV_PTR)); 615 } while (retry_count-- > 0); 616 /* Disable Periodic Reverse Encapsulation. */ 617 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 0, CMD); 618 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 619 mddi->reg_read = NULL; 620 mutex_unlock(&mddi->reg_read_lock); 621 return ri.result; 622} 623 624static struct mddi_info mddi_info[2]; 625 626static int __init mddi_clk_setup(struct platform_device *pdev, 627 struct mddi_info *mddi, 628 unsigned long clk_rate) 629{ 630 int ret; 631 632 /* set up the clocks */ 633 mddi->clk = clk_get(&pdev->dev, "mddi_clk"); 634 if (IS_ERR(mddi->clk)) { 635 printk(KERN_INFO "mddi: failed to get clock\n"); 636 return PTR_ERR(mddi->clk); 637 } 638 ret = clk_enable(mddi->clk); 639 if (ret) 640 goto fail; 641 ret = clk_set_rate(mddi->clk, clk_rate); 642 if (ret) 643 goto fail; 644 return 0; 645 646fail: 647 clk_put(mddi->clk); 648 return ret; 649} 650 651static int __init mddi_rev_data_setup(struct mddi_info *mddi) 652{ 653 void *dma; 654 dma_addr_t dma_addr; 655 656 /* set up dma buffer */ 657 dma = dma_alloc_coherent(NULL, 0x1000, &dma_addr, GFP_KERNEL); 658 if (dma == 0) 659 return -ENOMEM; 660 mddi->rev_data = dma; 661 mddi->rev_data_curr = 0; 662 mddi->rev_addr = dma_addr; 663 mddi->reg_write_data = dma + MDDI_REV_BUFFER_SIZE; 664 mddi->reg_write_addr = dma_addr + MDDI_REV_BUFFER_SIZE; 665 mddi->reg_read_data = mddi->reg_write_data + 1; 666 mddi->reg_read_addr = mddi->reg_write_addr + 667 sizeof(*mddi->reg_write_data); 668 return 0; 669} 670 671static int __devinit mddi_probe(struct platform_device *pdev) 672{ 673 struct msm_mddi_platform_data *pdata = pdev->dev.platform_data; 674 struct mddi_info *mddi = &mddi_info[pdev->id]; 675 struct resource *resource; 676 int ret, i; 677 678 resource = platform_get_resource(pdev, IORESOURCE_MEM, 0); 679 if (!resource) { 680 printk(KERN_ERR "mddi: no associated mem resource!\n"); 681 return -ENOMEM; 682 } 683 mddi->base = ioremap(resource->start, resource->end - resource->start); 684 if (!mddi->base) { 685 printk(KERN_ERR "mddi: failed to remap base!\n"); 686 ret = -EINVAL; 687 goto error_ioremap; 688 } 689 resource = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 690 if (!resource) { 691 printk(KERN_ERR "mddi: no associated irq resource!\n"); 692 ret = -EINVAL; 693 goto error_get_irq_resource; 694 } 695 mddi->irq = resource->start; 696 printk(KERN_INFO "mddi: init() base=0x%p irq=%d\n", mddi->base, 697 mddi->irq); 698 mddi->power_client = pdata->power_client; 699 700 mutex_init(&mddi->reg_write_lock); 701 mutex_init(&mddi->reg_read_lock); 702 spin_lock_init(&mddi->int_lock); 703 init_waitqueue_head(&mddi->int_wait); 704 705 ret = mddi_clk_setup(pdev, mddi, pdata->clk_rate); 706 if (ret) { 707 printk(KERN_ERR "mddi: failed to setup clock!\n"); 708 goto error_clk_setup; 709 } 710 711 ret = mddi_rev_data_setup(mddi); 712 if (ret) { 713 printk(KERN_ERR "mddi: failed to setup rev data!\n"); 714 goto error_rev_data; 715 } 716 717 mddi->int_enable = 0; 718 mddi_writel(mddi->int_enable, INTEN); 719 ret = request_irq(mddi->irq, mddi_isr, IRQF_DISABLED, "mddi", 720 &mddi->client_data); 721 if (ret) { 722 printk(KERN_ERR "mddi: failed to request enable irq!\n"); 723 goto error_request_irq; 724 } 725 726 /* turn on the mddi client bridge chip */ 727 if (mddi->power_client) 728 mddi->power_client(&mddi->client_data, 1); 729 730 /* initialize the mddi registers */ 731 mddi_set_auto_hibernate(&mddi->client_data, 0); 732 mddi_writel(MDDI_CMD_RESET, CMD); 733 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND); 734 mddi->version = mddi_init_registers(mddi); 735 if (mddi->version < 0x20) { 736 printk(KERN_ERR "mddi: unsupported version 0x%x\n", 737 mddi->version); 738 ret = -ENODEV; 739 goto error_mddi_version; 740 } 741 742 /* read the capabilities off the client */ 743 if (!mddi_get_client_caps(mddi)) { 744 printk(KERN_INFO "mddi: no client found\n"); 745 /* power down the panel */ 746 mddi_writel(MDDI_CMD_POWERDOWN, CMD); 747 printk(KERN_INFO "mddi powerdown: stat %x\n", mddi_readl(STAT)); 748 msleep(100); 749 printk(KERN_INFO "mddi powerdown: stat %x\n", mddi_readl(STAT)); 750 return 0; 751 } 752 mddi_set_auto_hibernate(&mddi->client_data, 1); 753 754 if (mddi->caps.Mfr_Name == 0 && mddi->caps.Product_Code == 0) 755 pdata->fixup(&mddi->caps.Mfr_Name, &mddi->caps.Product_Code); 756 757 mddi->client_pdev.id = 0; 758 for (i = 0; i < pdata->num_clients; i++) { 759 if (pdata->client_platform_data[i].product_id == 760 (mddi->caps.Mfr_Name << 16 | mddi->caps.Product_Code)) { 761 mddi->client_data.private_client_data = 762 pdata->client_platform_data[i].client_data; 763 mddi->client_pdev.name = 764 pdata->client_platform_data[i].name; 765 mddi->client_pdev.id = 766 pdata->client_platform_data[i].id; 767 break; 768 } 769 } 770 771 if (i >= pdata->num_clients) 772 mddi->client_pdev.name = "mddi_c_dummy"; 773 printk(KERN_INFO "mddi: registering panel %s\n", 774 mddi->client_pdev.name); 775 776 mddi->client_data.suspend = mddi_suspend; 777 mddi->client_data.resume = mddi_resume; 778 mddi->client_data.activate_link = mddi_activate_link; 779 mddi->client_data.remote_write = mddi_remote_write; 780 mddi->client_data.remote_read = mddi_remote_read; 781 mddi->client_data.auto_hibernate = mddi_set_auto_hibernate; 782 mddi->client_data.fb_resource = pdata->fb_resource; 783 if (pdev->id == 0) 784 mddi->client_data.interface_type = MSM_MDDI_PMDH_INTERFACE; 785 else if (pdev->id == 1) 786 mddi->client_data.interface_type = MSM_MDDI_EMDH_INTERFACE; 787 else { 788 printk(KERN_ERR "mddi: can not determine interface %d!\n", 789 pdev->id); 790 ret = -EINVAL; 791 goto error_mddi_interface; 792 } 793 794 mddi->client_pdev.dev.platform_data = &mddi->client_data; 795 printk(KERN_INFO "mddi: publish: %s\n", mddi->client_name); 796 platform_device_register(&mddi->client_pdev); 797 return 0; 798 799error_mddi_interface: 800error_mddi_version: 801 free_irq(mddi->irq, 0); 802error_request_irq: 803 dma_free_coherent(NULL, 0x1000, mddi->rev_data, mddi->rev_addr); 804error_rev_data: 805error_clk_setup: 806error_get_irq_resource: 807 iounmap(mddi->base); 808error_ioremap: 809 810 printk(KERN_INFO "mddi: mddi_init() failed (%d)\n", ret); 811 return ret; 812} 813 814 815static struct platform_driver mddi_driver = { 816 .probe = mddi_probe, 817 .driver = { .name = "msm_mddi" }, 818}; 819 820static int __init _mddi_init(void) 821{ 822 return platform_driver_register(&mddi_driver); 823} 824 825module_init(_mddi_init); 826