Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/mmc/sdio.c |
| 3 | * |
| 4 | * Copyright 2006-2007 Pierre Ossman |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or (at |
| 9 | * your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/err.h> |
| 13 | |
| 14 | #include <linux/mmc/host.h> |
| 15 | #include <linux/mmc/card.h> |
Pierre Ossman | 35c66c1 | 2007-06-11 20:25:43 +0200 | [diff] [blame] | 16 | #include <linux/mmc/sdio.h> |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 17 | #include <linux/mmc/sdio_func.h> |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 18 | |
| 19 | #include "core.h" |
| 20 | #include "bus.h" |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 21 | #include "sdio_bus.h" |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 22 | #include "mmc_ops.h" |
| 23 | #include "sd_ops.h" |
| 24 | #include "sdio_ops.h" |
Nicolas Pitre | b726126 | 2007-06-16 02:04:16 -0400 | [diff] [blame] | 25 | #include "sdio_cis.h" |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 26 | |
Pierre Ossman | 0597007 | 2007-06-11 21:01:00 +0200 | [diff] [blame] | 27 | static int sdio_read_fbr(struct sdio_func *func) |
| 28 | { |
| 29 | int ret; |
| 30 | unsigned char data; |
| 31 | |
| 32 | ret = mmc_io_rw_direct(func->card, 0, 0, |
David Vrabel | 7616ee9 | 2007-08-08 14:23:05 +0100 | [diff] [blame] | 33 | SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data); |
Pierre Ossman | 0597007 | 2007-06-11 21:01:00 +0200 | [diff] [blame] | 34 | if (ret) |
| 35 | goto out; |
| 36 | |
| 37 | data &= 0x0f; |
| 38 | |
| 39 | if (data == 0x0f) { |
| 40 | ret = mmc_io_rw_direct(func->card, 0, 0, |
David Vrabel | 7616ee9 | 2007-08-08 14:23:05 +0100 | [diff] [blame] | 41 | SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data); |
Pierre Ossman | 0597007 | 2007-06-11 21:01:00 +0200 | [diff] [blame] | 42 | if (ret) |
| 43 | goto out; |
| 44 | } |
| 45 | |
| 46 | func->class = data; |
| 47 | |
| 48 | out: |
| 49 | return ret; |
| 50 | } |
| 51 | |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 52 | static int sdio_init_func(struct mmc_card *card, unsigned int fn) |
| 53 | { |
Pierre Ossman | 0597007 | 2007-06-11 21:01:00 +0200 | [diff] [blame] | 54 | int ret; |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 55 | struct sdio_func *func; |
| 56 | |
| 57 | BUG_ON(fn > SDIO_MAX_FUNCS); |
| 58 | |
| 59 | func = sdio_alloc_func(card); |
| 60 | if (IS_ERR(func)) |
| 61 | return PTR_ERR(func); |
| 62 | |
| 63 | func->num = fn; |
| 64 | |
Pierre Ossman | 0597007 | 2007-06-11 21:01:00 +0200 | [diff] [blame] | 65 | ret = sdio_read_fbr(func); |
| 66 | if (ret) |
| 67 | goto fail; |
| 68 | |
Pierre Ossman | 1a632f8 | 2007-07-30 15:15:30 +0200 | [diff] [blame] | 69 | ret = sdio_read_func_cis(func); |
Nicolas Pitre | b726126 | 2007-06-16 02:04:16 -0400 | [diff] [blame] | 70 | if (ret) |
| 71 | goto fail; |
| 72 | |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 73 | card->sdio_func[fn - 1] = func; |
| 74 | |
| 75 | return 0; |
Pierre Ossman | 0597007 | 2007-06-11 21:01:00 +0200 | [diff] [blame] | 76 | |
| 77 | fail: |
| 78 | /* |
| 79 | * It is okay to remove the function here even though we hold |
| 80 | * the host lock as we haven't registered the device yet. |
| 81 | */ |
| 82 | sdio_remove_func(func); |
| 83 | return ret; |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 84 | } |
| 85 | |
Pierre Ossman | 35c66c1 | 2007-06-11 20:25:43 +0200 | [diff] [blame] | 86 | static int sdio_read_cccr(struct mmc_card *card) |
| 87 | { |
| 88 | int ret; |
| 89 | int cccr_vsn; |
| 90 | unsigned char data; |
| 91 | |
| 92 | memset(&card->cccr, 0, sizeof(struct sdio_cccr)); |
| 93 | |
| 94 | ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data); |
| 95 | if (ret) |
| 96 | goto out; |
| 97 | |
| 98 | cccr_vsn = data & 0x0f; |
| 99 | |
| 100 | if (cccr_vsn > SDIO_CCCR_REV_1_20) { |
| 101 | printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n", |
| 102 | mmc_hostname(card->host), cccr_vsn); |
| 103 | return -EINVAL; |
| 104 | } |
| 105 | |
| 106 | card->cccr.sdio_vsn = (data & 0xf0) >> 4; |
| 107 | |
| 108 | ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data); |
| 109 | if (ret) |
| 110 | goto out; |
| 111 | |
| 112 | if (data & SDIO_CCCR_CAP_SMB) |
| 113 | card->cccr.multi_block = 1; |
| 114 | if (data & SDIO_CCCR_CAP_LSC) |
| 115 | card->cccr.low_speed = 1; |
| 116 | if (data & SDIO_CCCR_CAP_4BLS) |
| 117 | card->cccr.wide_bus = 1; |
| 118 | |
| 119 | if (cccr_vsn >= SDIO_CCCR_REV_1_10) { |
| 120 | ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data); |
| 121 | if (ret) |
| 122 | goto out; |
| 123 | |
| 124 | if (data & SDIO_POWER_SMPC) |
| 125 | card->cccr.high_power = 1; |
| 126 | } |
| 127 | |
| 128 | if (cccr_vsn >= SDIO_CCCR_REV_1_20) { |
| 129 | ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data); |
| 130 | if (ret) |
| 131 | goto out; |
| 132 | |
| 133 | if (data & SDIO_SPEED_SHS) |
| 134 | card->cccr.high_speed = 1; |
| 135 | } |
| 136 | |
| 137 | out: |
| 138 | return ret; |
| 139 | } |
| 140 | |
Pierre Ossman | 4ff6471 | 2007-07-30 18:23:53 +0200 | [diff] [blame] | 141 | static int sdio_enable_wide(struct mmc_card *card) |
| 142 | { |
| 143 | int ret; |
| 144 | u8 ctrl; |
| 145 | |
| 146 | if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) |
| 147 | return 0; |
| 148 | |
| 149 | if (card->cccr.low_speed && !card->cccr.wide_bus) |
| 150 | return 0; |
| 151 | |
| 152 | ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl); |
| 153 | if (ret) |
| 154 | return ret; |
| 155 | |
| 156 | ctrl |= SDIO_BUS_WIDTH_4BIT; |
| 157 | |
| 158 | ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL); |
| 159 | if (ret) |
| 160 | return ret; |
| 161 | |
| 162 | mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); |
| 163 | |
| 164 | return 0; |
| 165 | } |
| 166 | |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 167 | /* |
| 168 | * Host is being removed. Free up the current card. |
| 169 | */ |
| 170 | static void mmc_sdio_remove(struct mmc_host *host) |
| 171 | { |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 172 | int i; |
| 173 | |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 174 | BUG_ON(!host); |
| 175 | BUG_ON(!host->card); |
| 176 | |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 177 | for (i = 0;i < host->card->sdio_funcs;i++) { |
| 178 | if (host->card->sdio_func[i]) { |
| 179 | sdio_remove_func(host->card->sdio_func[i]); |
| 180 | host->card->sdio_func[i] = NULL; |
| 181 | } |
| 182 | } |
| 183 | |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 184 | mmc_remove_card(host->card); |
| 185 | host->card = NULL; |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Card detection callback from host. |
| 190 | */ |
| 191 | static void mmc_sdio_detect(struct mmc_host *host) |
| 192 | { |
| 193 | int err; |
| 194 | |
| 195 | BUG_ON(!host); |
| 196 | BUG_ON(!host->card); |
| 197 | |
| 198 | mmc_claim_host(host); |
| 199 | |
| 200 | /* |
| 201 | * Just check if our card has been removed. |
| 202 | */ |
| 203 | err = mmc_select_card(host->card); |
| 204 | |
| 205 | mmc_release_host(host); |
| 206 | |
| 207 | if (err) { |
| 208 | mmc_sdio_remove(host); |
| 209 | |
| 210 | mmc_claim_host(host); |
| 211 | mmc_detach_bus(host); |
| 212 | mmc_release_host(host); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | |
| 217 | static const struct mmc_bus_ops mmc_sdio_ops = { |
| 218 | .remove = mmc_sdio_remove, |
| 219 | .detect = mmc_sdio_detect, |
| 220 | }; |
| 221 | |
| 222 | |
| 223 | /* |
| 224 | * Starting point for SDIO card init. |
| 225 | */ |
| 226 | int mmc_attach_sdio(struct mmc_host *host, u32 ocr) |
| 227 | { |
| 228 | int err; |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 229 | int i, funcs; |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 230 | struct mmc_card *card; |
| 231 | |
| 232 | BUG_ON(!host); |
Pierre Ossman | d84075c8 | 2007-08-09 13:23:56 +0200 | [diff] [blame] | 233 | WARN_ON(!host->claimed); |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 234 | |
| 235 | mmc_attach_bus(host, &mmc_sdio_ops); |
| 236 | |
| 237 | /* |
| 238 | * Sanity check the voltages that the card claims to |
| 239 | * support. |
| 240 | */ |
| 241 | if (ocr & 0x7F) { |
| 242 | printk(KERN_WARNING "%s: card claims to support voltages " |
| 243 | "below the defined range. These will be ignored.\n", |
| 244 | mmc_hostname(host)); |
| 245 | ocr &= ~0x7F; |
| 246 | } |
| 247 | |
| 248 | if (ocr & MMC_VDD_165_195) { |
| 249 | printk(KERN_WARNING "%s: SDIO card claims to support the " |
| 250 | "incompletely defined 'low voltage range'. This " |
| 251 | "will be ignored.\n", mmc_hostname(host)); |
| 252 | ocr &= ~MMC_VDD_165_195; |
| 253 | } |
| 254 | |
| 255 | host->ocr = mmc_select_voltage(host, ocr); |
| 256 | |
| 257 | /* |
| 258 | * Can we support the voltage(s) of the card(s)? |
| 259 | */ |
| 260 | if (!host->ocr) { |
| 261 | err = -EINVAL; |
| 262 | goto err; |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Inform the card of the voltage |
| 267 | */ |
| 268 | err = mmc_send_io_op_cond(host, host->ocr, &ocr); |
| 269 | if (err) |
| 270 | goto err; |
| 271 | |
| 272 | /* |
David Brownell | af51715 | 2007-08-08 09:11:32 -0700 | [diff] [blame] | 273 | * For SPI, enable CRC as appropriate. |
| 274 | */ |
| 275 | if (mmc_host_is_spi(host)) { |
| 276 | err = mmc_spi_set_crc(host, use_spi_crc); |
| 277 | if (err) |
| 278 | goto err; |
| 279 | } |
| 280 | |
| 281 | /* |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 282 | * The number of functions on the card is encoded inside |
| 283 | * the ocr. |
| 284 | */ |
| 285 | funcs = (ocr & 0x70000000) >> 28; |
| 286 | |
| 287 | /* |
| 288 | * Allocate card structure. |
| 289 | */ |
| 290 | card = mmc_alloc_card(host); |
| 291 | if (IS_ERR(card)) { |
| 292 | err = PTR_ERR(card); |
| 293 | goto err; |
| 294 | } |
| 295 | |
| 296 | card->type = MMC_TYPE_SDIO; |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 297 | card->sdio_funcs = funcs; |
| 298 | |
| 299 | host->card = card; |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 300 | |
| 301 | /* |
David Brownell | af51715 | 2007-08-08 09:11:32 -0700 | [diff] [blame] | 302 | * For native busses: set card RCA and quit open drain mode. |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 303 | */ |
David Brownell | af51715 | 2007-08-08 09:11:32 -0700 | [diff] [blame] | 304 | if (!mmc_host_is_spi(host)) { |
| 305 | err = mmc_send_relative_addr(host, &card->rca); |
| 306 | if (err) |
| 307 | goto remove; |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 308 | |
David Brownell | af51715 | 2007-08-08 09:11:32 -0700 | [diff] [blame] | 309 | mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); |
| 310 | } |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 311 | |
| 312 | /* |
| 313 | * Select card, as all following commands rely on that. |
| 314 | */ |
David Brownell | af51715 | 2007-08-08 09:11:32 -0700 | [diff] [blame] | 315 | if (!mmc_host_is_spi(host)) { |
| 316 | err = mmc_select_card(card); |
| 317 | if (err) |
| 318 | goto remove; |
| 319 | } |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 320 | |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 321 | /* |
Pierre Ossman | 35c66c1 | 2007-06-11 20:25:43 +0200 | [diff] [blame] | 322 | * Read the common registers. |
| 323 | */ |
| 324 | err = sdio_read_cccr(card); |
| 325 | if (err) |
| 326 | goto remove; |
| 327 | |
| 328 | /* |
Pierre Ossman | 1a632f8 | 2007-07-30 15:15:30 +0200 | [diff] [blame] | 329 | * Read the common CIS tuples. |
| 330 | */ |
| 331 | err = sdio_read_common_cis(card); |
| 332 | if (err) |
| 333 | goto remove; |
| 334 | |
| 335 | /* |
Pierre Ossman | 6db5020 | 2007-07-30 17:15:07 +0200 | [diff] [blame] | 336 | * No support for high-speed yet, so just set |
| 337 | * the card's maximum speed. |
| 338 | */ |
| 339 | mmc_set_clock(host, card->cis.max_dtr); |
| 340 | |
| 341 | /* |
Pierre Ossman | 4ff6471 | 2007-07-30 18:23:53 +0200 | [diff] [blame] | 342 | * Switch to wider bus (if supported). |
| 343 | */ |
| 344 | err = sdio_enable_wide(card); |
| 345 | if (err) |
| 346 | goto remove; |
| 347 | |
| 348 | /* |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 349 | * Initialize (but don't add) all present functions. |
| 350 | */ |
| 351 | for (i = 0;i < funcs;i++) { |
| 352 | err = sdio_init_func(host->card, i + 1); |
| 353 | if (err) |
| 354 | goto remove; |
| 355 | } |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 356 | |
| 357 | mmc_release_host(host); |
| 358 | |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 359 | /* |
| 360 | * First add the card to the driver model... |
| 361 | */ |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 362 | err = mmc_add_card(host->card); |
| 363 | if (err) |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 364 | goto remove_added; |
| 365 | |
| 366 | /* |
| 367 | * ...then the SDIO functions. |
| 368 | */ |
| 369 | for (i = 0;i < funcs;i++) { |
| 370 | err = sdio_add_func(host->card->sdio_func[i]); |
| 371 | if (err) |
| 372 | goto remove_added; |
| 373 | } |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 374 | |
| 375 | return 0; |
| 376 | |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 377 | |
| 378 | remove_added: |
| 379 | /* Remove without lock if the device has been added. */ |
| 380 | mmc_sdio_remove(host); |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 381 | mmc_claim_host(host); |
Pierre Ossman | e29a7d7 | 2007-05-26 13:48:18 +0200 | [diff] [blame] | 382 | remove: |
| 383 | /* And with lock if it hasn't been added. */ |
| 384 | if (host->card) |
| 385 | mmc_sdio_remove(host); |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame] | 386 | err: |
| 387 | mmc_detach_bus(host); |
| 388 | mmc_release_host(host); |
| 389 | |
| 390 | printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n", |
| 391 | mmc_hostname(host), err); |
| 392 | |
| 393 | return err; |
| 394 | } |
| 395 | |