Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/gfp.h> |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 25 | #include <linux/spinlock.h> |
| 26 | #include <linux/clk.h> |
| 27 | #include <linux/io.h> |
Pavel Machek | 69fd8d2 | 2009-11-11 14:26:51 -0800 | [diff] [blame] | 28 | #include <linux/sched.h> |
Arnd Bergmann | 1ef21f6 | 2012-08-24 15:14:41 +0200 | [diff] [blame] | 29 | #include <linux/platform_data/video-msm_fb.h> |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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 | |
| 40 | union 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 | |
| 48 | struct reg_read_info { |
| 49 | struct completion done; |
| 50 | uint32_t reg; |
| 51 | uint32_t status; |
| 52 | uint32_t result; |
| 53 | }; |
| 54 | |
| 55 | struct 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 | |
| 94 | static 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 | |
| 99 | void 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 | |
| 107 | static void mddi_handle_link_list_done(struct mddi_info *mddi) |
| 108 | { |
| 109 | } |
| 110 | |
| 111 | static 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 | |
| 120 | static 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 | |
| 183 | static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask); |
| 184 | |
| 185 | static void mddi_handle_rev_data_avail(struct mddi_info *mddi) |
| 186 | { |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 187 | uint32_t rev_data_count; |
| 188 | uint32_t rev_crc_err_count; |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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 | |
| 255 | static 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 | |
| 301 | static 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 | |
| 315 | static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask) |
| 316 | { |
| 317 | if (mddi_wait_interrupt_timeout(mddi, intmask, HZ/10) == 0) |
Joe Perches | 17f52ed | 2010-10-25 19:44:27 -0700 | [diff] [blame] | 318 | printk(KERN_INFO "mddi_wait_interrupt %d, timeout " |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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 | |
| 324 | static 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 | |
| 332 | void 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 | |
| 343 | static 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 | |
| 386 | static 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 | |
| 400 | static 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 | |
Greg Kroah-Hartman | 48c68c4 | 2012-12-21 13:07:39 -0800 | [diff] [blame] | 420 | static int mddi_get_client_caps(struct mddi_info *mddi) |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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; |
Joe Perches | 17f52ed | 2010-10-25 19:44:27 -0700 | [diff] [blame] | 465 | printk(KERN_INFO "mddi_init, timeout waiting for caps\n"); |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 466 | } |
| 467 | return mddi->flags & FLAG_HAVE_CAPS; |
| 468 | } |
| 469 | |
| 470 | /* link must be active when this is called */ |
| 471 | int 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 | |
| 508 | void 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 | |
| 544 | uint32_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 | |
| 620 | static struct mddi_info mddi_info[2]; |
| 621 | |
Greg Kroah-Hartman | 48c68c4 | 2012-12-21 13:07:39 -0800 | [diff] [blame] | 622 | static int mddi_clk_setup(struct platform_device *pdev, struct mddi_info *mddi, |
| 623 | unsigned long clk_rate) |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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 | |
| 641 | fail: |
| 642 | clk_put(mddi->clk); |
| 643 | return ret; |
| 644 | } |
| 645 | |
| 646 | static 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 | |
Greg Kroah-Hartman | 48c68c4 | 2012-12-21 13:07:39 -0800 | [diff] [blame] | 666 | static int mddi_probe(struct platform_device *pdev) |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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 | } |
Joe Perches | 06794ea | 2011-03-23 12:55:36 -0700 | [diff] [blame] | 678 | mddi->base = ioremap(resource->start, resource_size(resource)); |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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); |
Yong Zhang | f8798cc | 2011-09-22 16:59:16 +0800 | [diff] [blame] | 714 | ret = request_irq(mddi->irq, mddi_isr, 0, "mddi", |
Pavel Machek | d480ace | 2009-09-22 16:47:03 -0700 | [diff] [blame] | 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 | |
| 795 | error_mddi_interface: |
| 796 | error_mddi_version: |
| 797 | free_irq(mddi->irq, 0); |
| 798 | error_request_irq: |
| 799 | dma_free_coherent(NULL, 0x1000, mddi->rev_data, mddi->rev_addr); |
| 800 | error_rev_data: |
| 801 | error_clk_setup: |
| 802 | error_get_irq_resource: |
| 803 | iounmap(mddi->base); |
| 804 | error_ioremap: |
| 805 | |
| 806 | printk(KERN_INFO "mddi: mddi_init() failed (%d)\n", ret); |
| 807 | return ret; |
| 808 | } |
| 809 | |
| 810 | |
| 811 | static struct platform_driver mddi_driver = { |
| 812 | .probe = mddi_probe, |
| 813 | .driver = { .name = "msm_mddi" }, |
| 814 | }; |
| 815 | |
| 816 | static int __init _mddi_init(void) |
| 817 | { |
| 818 | return platform_driver_register(&mddi_driver); |
| 819 | } |
| 820 | |
| 821 | module_init(_mddi_init); |