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25185f3f31
This adds SDIO devicetree subnode parsing to the mmc core. While SDIO devices are runtime probable they sometimes need nonprobable additional information on embedded systems, like an additional gpio interrupt or a clock. This patch makes it possible to supply this information from the devicetree. SDIO drivers will find a pointer to the devicenode in their devices of_node pointer. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> [hdegoede@redhat.com: Misc. cleanups] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
361 lines
7.5 KiB
C
361 lines
7.5 KiB
C
/*
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* linux/drivers/mmc/core/bus.c
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright (C) 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 version 2 as
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* published by the Free Software Foundation.
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*
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* MMC card bus driver model
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*/
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#include <linux/export.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/of.h>
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#include <linux/pm_runtime.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include "core.h"
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#include "sdio_cis.h"
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#include "bus.h"
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static ssize_t type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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switch (card->type) {
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case MMC_TYPE_MMC:
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return sprintf(buf, "MMC\n");
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case MMC_TYPE_SD:
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return sprintf(buf, "SD\n");
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case MMC_TYPE_SDIO:
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return sprintf(buf, "SDIO\n");
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case MMC_TYPE_SD_COMBO:
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return sprintf(buf, "SDcombo\n");
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default:
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return -EFAULT;
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}
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}
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static DEVICE_ATTR_RO(type);
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static struct attribute *mmc_dev_attrs[] = {
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&dev_attr_type.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(mmc_dev);
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/*
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* This currently matches any MMC driver to any MMC card - drivers
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* themselves make the decision whether to drive this card in their
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* probe method.
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*/
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static int mmc_bus_match(struct device *dev, struct device_driver *drv)
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{
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return 1;
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}
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static int
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mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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const char *type;
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int retval = 0;
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switch (card->type) {
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case MMC_TYPE_MMC:
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type = "MMC";
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break;
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case MMC_TYPE_SD:
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type = "SD";
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break;
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case MMC_TYPE_SDIO:
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type = "SDIO";
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break;
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case MMC_TYPE_SD_COMBO:
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type = "SDcombo";
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break;
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default:
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type = NULL;
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}
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if (type) {
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retval = add_uevent_var(env, "MMC_TYPE=%s", type);
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if (retval)
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return retval;
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}
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retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
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if (retval)
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return retval;
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/*
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* Request the mmc_block device. Note: that this is a direct request
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* for the module it carries no information as to what is inserted.
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*/
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retval = add_uevent_var(env, "MODALIAS=mmc:block");
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return retval;
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}
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static void mmc_bus_shutdown(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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struct mmc_host *host = card->host;
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int ret;
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if (dev->driver && dev->driver->shutdown)
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dev->driver->shutdown(dev);
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if (host->bus_ops->shutdown) {
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ret = host->bus_ops->shutdown(host);
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if (ret)
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pr_warn("%s: error %d during shutdown\n",
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mmc_hostname(host), ret);
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}
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}
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#ifdef CONFIG_PM_SLEEP
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static int mmc_bus_suspend(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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struct mmc_host *host = card->host;
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int ret;
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ret = pm_generic_suspend(dev);
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if (ret)
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return ret;
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ret = host->bus_ops->suspend(host);
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return ret;
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}
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static int mmc_bus_resume(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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struct mmc_host *host = card->host;
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int ret;
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ret = host->bus_ops->resume(host);
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if (ret)
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pr_warn("%s: error %d during resume (card was removed?)\n",
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mmc_hostname(host), ret);
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ret = pm_generic_resume(dev);
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return ret;
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}
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#endif
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#ifdef CONFIG_PM
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static int mmc_runtime_suspend(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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struct mmc_host *host = card->host;
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return host->bus_ops->runtime_suspend(host);
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}
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static int mmc_runtime_resume(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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struct mmc_host *host = card->host;
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return host->bus_ops->runtime_resume(host);
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}
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#endif /* !CONFIG_PM */
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static const struct dev_pm_ops mmc_bus_pm_ops = {
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SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
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SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
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};
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static struct bus_type mmc_bus_type = {
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.name = "mmc",
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.dev_groups = mmc_dev_groups,
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.match = mmc_bus_match,
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.uevent = mmc_bus_uevent,
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.shutdown = mmc_bus_shutdown,
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.pm = &mmc_bus_pm_ops,
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};
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int mmc_register_bus(void)
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{
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return bus_register(&mmc_bus_type);
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}
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void mmc_unregister_bus(void)
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{
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bus_unregister(&mmc_bus_type);
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}
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/**
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* mmc_register_driver - register a media driver
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* @drv: MMC media driver
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*/
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int mmc_register_driver(struct device_driver *drv)
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{
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drv->bus = &mmc_bus_type;
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return driver_register(drv);
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}
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EXPORT_SYMBOL(mmc_register_driver);
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/**
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* mmc_unregister_driver - unregister a media driver
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* @drv: MMC media driver
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*/
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void mmc_unregister_driver(struct device_driver *drv)
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{
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drv->bus = &mmc_bus_type;
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driver_unregister(drv);
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}
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EXPORT_SYMBOL(mmc_unregister_driver);
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static void mmc_release_card(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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sdio_free_common_cis(card);
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kfree(card->info);
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kfree(card);
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}
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/*
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* Allocate and initialise a new MMC card structure.
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*/
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struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
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{
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struct mmc_card *card;
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card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
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if (!card)
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return ERR_PTR(-ENOMEM);
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card->host = host;
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device_initialize(&card->dev);
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card->dev.parent = mmc_classdev(host);
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card->dev.bus = &mmc_bus_type;
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card->dev.release = mmc_release_card;
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card->dev.type = type;
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return card;
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}
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/*
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* Register a new MMC card with the driver model.
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*/
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int mmc_add_card(struct mmc_card *card)
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{
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int ret;
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const char *type;
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const char *uhs_bus_speed_mode = "";
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static const char *const uhs_speeds[] = {
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[UHS_SDR12_BUS_SPEED] = "SDR12 ",
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[UHS_SDR25_BUS_SPEED] = "SDR25 ",
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[UHS_SDR50_BUS_SPEED] = "SDR50 ",
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[UHS_SDR104_BUS_SPEED] = "SDR104 ",
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[UHS_DDR50_BUS_SPEED] = "DDR50 ",
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};
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dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
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switch (card->type) {
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case MMC_TYPE_MMC:
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type = "MMC";
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break;
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case MMC_TYPE_SD:
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type = "SD";
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if (mmc_card_blockaddr(card)) {
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if (mmc_card_ext_capacity(card))
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type = "SDXC";
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else
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type = "SDHC";
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}
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break;
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case MMC_TYPE_SDIO:
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type = "SDIO";
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break;
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case MMC_TYPE_SD_COMBO:
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type = "SD-combo";
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if (mmc_card_blockaddr(card))
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type = "SDHC-combo";
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break;
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default:
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type = "?";
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break;
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}
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if (mmc_card_uhs(card) &&
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(card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
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uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
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if (mmc_host_is_spi(card->host)) {
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pr_info("%s: new %s%s%s card on SPI\n",
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mmc_hostname(card->host),
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mmc_card_hs(card) ? "high speed " : "",
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mmc_card_ddr52(card) ? "DDR " : "",
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type);
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} else {
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pr_info("%s: new %s%s%s%s%s card at address %04x\n",
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mmc_hostname(card->host),
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mmc_card_uhs(card) ? "ultra high speed " :
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(mmc_card_hs(card) ? "high speed " : ""),
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mmc_card_hs400(card) ? "HS400 " :
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(mmc_card_hs200(card) ? "HS200 " : ""),
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mmc_card_ddr52(card) ? "DDR " : "",
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uhs_bus_speed_mode, type, card->rca);
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}
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#ifdef CONFIG_DEBUG_FS
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mmc_add_card_debugfs(card);
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#endif
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mmc_init_context_info(card->host);
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card->dev.of_node = mmc_of_find_child_device(card->host, 0);
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ret = device_add(&card->dev);
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if (ret)
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return ret;
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mmc_card_set_present(card);
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return 0;
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}
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/*
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* Unregister a new MMC card with the driver model, and
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* (eventually) free it.
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*/
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void mmc_remove_card(struct mmc_card *card)
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{
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#ifdef CONFIG_DEBUG_FS
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mmc_remove_card_debugfs(card);
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#endif
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if (mmc_card_present(card)) {
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if (mmc_host_is_spi(card->host)) {
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pr_info("%s: SPI card removed\n",
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mmc_hostname(card->host));
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} else {
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pr_info("%s: card %04x removed\n",
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mmc_hostname(card->host), card->rca);
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}
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device_del(&card->dev);
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of_node_put(card->dev.of_node);
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}
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put_device(&card->dev);
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}
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