2 * linux/drivers/mmc/sdio.c
4 * Copyright 2006-2007 Pierre Ossman
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.
12 #include <linux/err.h>
14 #include <linux/mmc/host.h>
15 #include <linux/mmc/card.h>
16 #include <linux/mmc/sdio.h>
17 #include <linux/mmc/sdio_func.h>
27 static int sdio_read_fbr(struct sdio_func *func)
32 ret = mmc_io_rw_direct(func->card, 0, 0,
33 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
40 ret = mmc_io_rw_direct(func->card, 0, 0,
41 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
52 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
55 struct sdio_func *func;
57 BUG_ON(fn > SDIO_MAX_FUNCS);
59 func = sdio_alloc_func(card);
65 ret = sdio_read_fbr(func);
69 ret = sdio_read_func_cis(func);
73 card->sdio_func[fn - 1] = func;
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.
82 sdio_remove_func(func);
86 static int sdio_read_cccr(struct mmc_card *card)
92 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
94 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
98 cccr_vsn = data & 0x0f;
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);
106 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
108 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
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;
119 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
120 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
124 if (data & SDIO_POWER_SMPC)
125 card->cccr.high_power = 1;
128 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
129 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
133 if (data & SDIO_SPEED_SHS)
134 card->cccr.high_speed = 1;
141 static int sdio_enable_wide(struct mmc_card *card)
146 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
149 if (card->cccr.low_speed && !card->cccr.wide_bus)
152 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
156 ctrl |= SDIO_BUS_WIDTH_4BIT;
158 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
162 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
168 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
169 * of the card. This may be required on certain setups of boards,
170 * controllers and embedded sdio device which do not need the card's
171 * pull-up. As a result, card detection is disabled and power is saved.
173 static int sdio_disable_cd(struct mmc_card *card)
178 if (!card->cccr.disable_cd)
181 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
185 ctrl |= SDIO_BUS_CD_DISABLE;
187 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
191 * Test if the card supports high-speed mode and, if so, switch to it.
193 static int sdio_enable_hs(struct mmc_card *card)
198 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
201 if (!card->cccr.high_speed)
204 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
208 speed |= SDIO_SPEED_EHS;
210 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
214 mmc_card_set_highspeed(card);
215 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
221 * Host is being removed. Free up the current card.
223 static void mmc_sdio_remove(struct mmc_host *host)
230 for (i = 0;i < host->card->sdio_funcs;i++) {
231 if (host->card->sdio_func[i]) {
232 sdio_remove_func(host->card->sdio_func[i]);
233 host->card->sdio_func[i] = NULL;
237 mmc_remove_card(host->card);
242 * Card detection callback from host.
244 static void mmc_sdio_detect(struct mmc_host *host)
251 mmc_claim_host(host);
254 * Just check if our card has been removed.
256 err = mmc_select_card(host->card);
258 mmc_release_host(host);
261 mmc_sdio_remove(host);
263 mmc_claim_host(host);
264 mmc_detach_bus(host);
265 mmc_release_host(host);
270 static const struct mmc_bus_ops mmc_sdio_ops = {
271 .remove = mmc_sdio_remove,
272 .detect = mmc_sdio_detect,
277 * Starting point for SDIO card init.
279 int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
283 struct mmc_card *card;
286 WARN_ON(!host->claimed);
288 mmc_attach_bus(host, &mmc_sdio_ops);
291 * Sanity check the voltages that the card claims to
295 printk(KERN_WARNING "%s: card claims to support voltages "
296 "below the defined range. These will be ignored.\n",
301 host->ocr = mmc_select_voltage(host, ocr);
304 * Can we support the voltage(s) of the card(s)?
312 * Inform the card of the voltage
314 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
319 * For SPI, enable CRC as appropriate.
321 if (mmc_host_is_spi(host)) {
322 err = mmc_spi_set_crc(host, use_spi_crc);
328 * The number of functions on the card is encoded inside
331 funcs = (ocr & 0x70000000) >> 28;
334 * Allocate card structure.
336 card = mmc_alloc_card(host, NULL);
342 card->type = MMC_TYPE_SDIO;
343 card->sdio_funcs = funcs;
348 * For native busses: set card RCA and quit open drain mode.
350 if (!mmc_host_is_spi(host)) {
351 err = mmc_send_relative_addr(host, &card->rca);
355 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
359 * Select card, as all following commands rely on that.
361 if (!mmc_host_is_spi(host)) {
362 err = mmc_select_card(card);
368 * Read the common registers.
370 err = sdio_read_cccr(card);
375 * Read the common CIS tuples.
377 err = sdio_read_common_cis(card);
382 * Switch to high-speed (if supported).
384 err = sdio_enable_hs(card);
389 * Change to the card's maximum speed.
391 if (mmc_card_highspeed(card)) {
393 * The SDIO specification doesn't mention how
394 * the CIS transfer speed register relates to
395 * high-speed, but it seems that 50 MHz is
398 mmc_set_clock(host, 50000000);
400 mmc_set_clock(host, card->cis.max_dtr);
404 * Switch to wider bus (if supported).
406 err = sdio_enable_wide(card);
411 * If needed, disconnect card detection pull-up resistor.
413 err = sdio_disable_cd(card);
418 * Initialize (but don't add) all present functions.
420 for (i = 0;i < funcs;i++) {
421 err = sdio_init_func(host->card, i + 1);
426 mmc_release_host(host);
429 * First add the card to the driver model...
431 err = mmc_add_card(host->card);
436 * ...then the SDIO functions.
438 for (i = 0;i < funcs;i++) {
439 err = sdio_add_func(host->card->sdio_func[i]);
448 /* Remove without lock if the device has been added. */
449 mmc_sdio_remove(host);
450 mmc_claim_host(host);
452 /* And with lock if it hasn't been added. */
454 mmc_sdio_remove(host);
456 mmc_detach_bus(host);
457 mmc_release_host(host);
459 printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
460 mmc_hostname(host), err);