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