e29a7d73f4
Add the sdio bus type and basic device handling. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
230 lines
4.1 KiB
C
230 lines
4.1 KiB
C
/*
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* linux/drivers/mmc/sdio.c
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*
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* Copyright 2006-2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#include <linux/err.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/sdio_func.h>
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#include "core.h"
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#include "bus.h"
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#include "sdio_bus.h"
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#include "mmc_ops.h"
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#include "sd_ops.h"
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#include "sdio_ops.h"
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static int sdio_init_func(struct mmc_card *card, unsigned int fn)
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{
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struct sdio_func *func;
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BUG_ON(fn > SDIO_MAX_FUNCS);
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func = sdio_alloc_func(card);
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if (IS_ERR(func))
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return PTR_ERR(func);
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func->num = fn;
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card->sdio_func[fn - 1] = func;
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return 0;
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}
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/*
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* Host is being removed. Free up the current card.
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*/
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static void mmc_sdio_remove(struct mmc_host *host)
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{
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int i;
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BUG_ON(!host);
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BUG_ON(!host->card);
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for (i = 0;i < host->card->sdio_funcs;i++) {
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if (host->card->sdio_func[i]) {
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sdio_remove_func(host->card->sdio_func[i]);
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host->card->sdio_func[i] = NULL;
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}
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}
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mmc_remove_card(host->card);
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host->card = NULL;
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}
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/*
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* Card detection callback from host.
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*/
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static void mmc_sdio_detect(struct mmc_host *host)
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{
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int err;
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BUG_ON(!host);
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BUG_ON(!host->card);
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mmc_claim_host(host);
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/*
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* Just check if our card has been removed.
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*/
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err = mmc_select_card(host->card);
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mmc_release_host(host);
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if (err) {
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mmc_sdio_remove(host);
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mmc_claim_host(host);
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mmc_detach_bus(host);
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mmc_release_host(host);
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}
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}
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static const struct mmc_bus_ops mmc_sdio_ops = {
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.remove = mmc_sdio_remove,
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.detect = mmc_sdio_detect,
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};
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/*
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* Starting point for SDIO card init.
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*/
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int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
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{
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int err;
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int i, funcs;
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struct mmc_card *card;
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BUG_ON(!host);
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BUG_ON(!host->claimed);
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mmc_attach_bus(host, &mmc_sdio_ops);
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/*
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* Sanity check the voltages that the card claims to
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* support.
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*/
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if (ocr & 0x7F) {
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printk(KERN_WARNING "%s: card claims to support voltages "
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"below the defined range. These will be ignored.\n",
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mmc_hostname(host));
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ocr &= ~0x7F;
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}
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if (ocr & MMC_VDD_165_195) {
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printk(KERN_WARNING "%s: SDIO card claims to support the "
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"incompletely defined 'low voltage range'. This "
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"will be ignored.\n", mmc_hostname(host));
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ocr &= ~MMC_VDD_165_195;
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}
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host->ocr = mmc_select_voltage(host, ocr);
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/*
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* Can we support the voltage(s) of the card(s)?
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*/
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if (!host->ocr) {
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err = -EINVAL;
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goto err;
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}
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/*
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* Inform the card of the voltage
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*/
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err = mmc_send_io_op_cond(host, host->ocr, &ocr);
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if (err)
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goto err;
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/*
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* The number of functions on the card is encoded inside
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* the ocr.
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*/
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funcs = (ocr & 0x70000000) >> 28;
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/*
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* Allocate card structure.
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*/
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card = mmc_alloc_card(host);
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if (IS_ERR(card)) {
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err = PTR_ERR(card);
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goto err;
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}
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card->type = MMC_TYPE_SDIO;
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card->sdio_funcs = funcs;
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host->card = card;
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/*
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* Set card RCA.
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*/
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err = mmc_send_relative_addr(host, &card->rca);
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if (err)
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goto remove;
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mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
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/*
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* Select card, as all following commands rely on that.
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*/
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err = mmc_select_card(card);
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if (err)
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goto remove;
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/*
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* Initialize (but don't add) all present functions.
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*/
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for (i = 0;i < funcs;i++) {
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err = sdio_init_func(host->card, i + 1);
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if (err)
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goto remove;
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}
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mmc_release_host(host);
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/*
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* First add the card to the driver model...
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*/
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err = mmc_add_card(host->card);
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if (err)
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goto remove_added;
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/*
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* ...then the SDIO functions.
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*/
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for (i = 0;i < funcs;i++) {
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err = sdio_add_func(host->card->sdio_func[i]);
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if (err)
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goto remove_added;
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}
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return 0;
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remove_added:
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/* Remove without lock if the device has been added. */
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mmc_sdio_remove(host);
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mmc_claim_host(host);
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remove:
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/* And with lock if it hasn't been added. */
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if (host->card)
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mmc_sdio_remove(host);
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err:
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mmc_detach_bus(host);
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mmc_release_host(host);
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printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
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mmc_hostname(host), err);
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return err;
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}
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