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>
26 static int sdio_read_fbr(struct sdio_func *func)
31 ret = mmc_io_rw_direct(func->card, 0, 0,
32 func->num * 0x100 + SDIO_FBR_STD_IF, 0, &data);
39 ret = mmc_io_rw_direct(func->card, 0, 0,
40 func->num * 0x100 + SDIO_FBR_STD_IF_EXT, 0, &data);
51 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
54 struct sdio_func *func;
56 BUG_ON(fn > SDIO_MAX_FUNCS);
58 func = sdio_alloc_func(card);
64 ret = sdio_read_fbr(func);
68 card->sdio_func[fn - 1] = func;
74 * It is okay to remove the function here even though we hold
75 * the host lock as we haven't registered the device yet.
77 sdio_remove_func(func);
81 static int sdio_read_cccr(struct mmc_card *card)
87 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
89 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
93 cccr_vsn = data & 0x0f;
95 if (cccr_vsn > SDIO_CCCR_REV_1_20) {
96 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
97 mmc_hostname(card->host), cccr_vsn);
101 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
103 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
107 if (data & SDIO_CCCR_CAP_SMB)
108 card->cccr.multi_block = 1;
109 if (data & SDIO_CCCR_CAP_LSC)
110 card->cccr.low_speed = 1;
111 if (data & SDIO_CCCR_CAP_4BLS)
112 card->cccr.wide_bus = 1;
114 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
115 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
119 if (data & SDIO_POWER_SMPC)
120 card->cccr.high_power = 1;
123 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
124 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
128 if (data & SDIO_SPEED_SHS)
129 card->cccr.high_speed = 1;
137 * Host is being removed. Free up the current card.
139 static void mmc_sdio_remove(struct mmc_host *host)
146 for (i = 0;i < host->card->sdio_funcs;i++) {
147 if (host->card->sdio_func[i]) {
148 sdio_remove_func(host->card->sdio_func[i]);
149 host->card->sdio_func[i] = NULL;
153 mmc_remove_card(host->card);
158 * Card detection callback from host.
160 static void mmc_sdio_detect(struct mmc_host *host)
167 mmc_claim_host(host);
170 * Just check if our card has been removed.
172 err = mmc_select_card(host->card);
174 mmc_release_host(host);
177 mmc_sdio_remove(host);
179 mmc_claim_host(host);
180 mmc_detach_bus(host);
181 mmc_release_host(host);
186 static const struct mmc_bus_ops mmc_sdio_ops = {
187 .remove = mmc_sdio_remove,
188 .detect = mmc_sdio_detect,
193 * Starting point for SDIO card init.
195 int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
199 struct mmc_card *card;
202 BUG_ON(!host->claimed);
204 mmc_attach_bus(host, &mmc_sdio_ops);
207 * Sanity check the voltages that the card claims to
211 printk(KERN_WARNING "%s: card claims to support voltages "
212 "below the defined range. These will be ignored.\n",
217 if (ocr & MMC_VDD_165_195) {
218 printk(KERN_WARNING "%s: SDIO card claims to support the "
219 "incompletely defined 'low voltage range'. This "
220 "will be ignored.\n", mmc_hostname(host));
221 ocr &= ~MMC_VDD_165_195;
224 host->ocr = mmc_select_voltage(host, ocr);
227 * Can we support the voltage(s) of the card(s)?
235 * Inform the card of the voltage
237 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
242 * The number of functions on the card is encoded inside
245 funcs = (ocr & 0x70000000) >> 28;
248 * Allocate card structure.
250 card = mmc_alloc_card(host);
256 card->type = MMC_TYPE_SDIO;
257 card->sdio_funcs = funcs;
264 err = mmc_send_relative_addr(host, &card->rca);
268 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
271 * Select card, as all following commands rely on that.
273 err = mmc_select_card(card);
278 * Read the common registers.
280 err = sdio_read_cccr(card);
285 * Initialize (but don't add) all present functions.
287 for (i = 0;i < funcs;i++) {
288 err = sdio_init_func(host->card, i + 1);
293 mmc_release_host(host);
296 * First add the card to the driver model...
298 err = mmc_add_card(host->card);
303 * ...then the SDIO functions.
305 for (i = 0;i < funcs;i++) {
306 err = sdio_add_func(host->card->sdio_func[i]);
315 /* Remove without lock if the device has been added. */
316 mmc_sdio_remove(host);
317 mmc_claim_host(host);
319 /* And with lock if it hasn't been added. */
321 mmc_sdio_remove(host);
323 mmc_detach_bus(host);
324 mmc_release_host(host);
326 printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
327 mmc_hostname(host), err);