6edd8ee60a
When CONFIG_DEBUG_FS is set, create a few files under /sys/kernel/debug containing information about an mmc host's internal state. Currently, just a single file is created, "ios", which contains information about the current operating parameters for the bus (clock speed, bus width, etc.) Host drivers can add additional files and directories under the host's root directory by passing the debugfs_root field in struct mmc_host as the 'parent' parameter to debugfs_create_*. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
181 lines
3.7 KiB
C
181 lines
3.7 KiB
C
/*
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* linux/drivers/mmc/core/host.c
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright (C) 2007-2008 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 host class device management
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/idr.h>
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#include <linux/pagemap.h>
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#include <linux/leds.h>
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#include <linux/mmc/host.h>
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#include "core.h"
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#include "host.h"
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#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
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static void mmc_host_classdev_release(struct device *dev)
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{
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struct mmc_host *host = cls_dev_to_mmc_host(dev);
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kfree(host);
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}
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static struct class mmc_host_class = {
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.name = "mmc_host",
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.dev_release = mmc_host_classdev_release,
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};
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int mmc_register_host_class(void)
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{
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return class_register(&mmc_host_class);
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}
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void mmc_unregister_host_class(void)
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{
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class_unregister(&mmc_host_class);
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}
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static DEFINE_IDR(mmc_host_idr);
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static DEFINE_SPINLOCK(mmc_host_lock);
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/**
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* mmc_alloc_host - initialise the per-host structure.
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* @extra: sizeof private data structure
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* @dev: pointer to host device model structure
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*
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* Initialise the per-host structure.
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*/
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struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
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{
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int err;
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struct mmc_host *host;
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if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
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return NULL;
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host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
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if (!host)
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return NULL;
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spin_lock(&mmc_host_lock);
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err = idr_get_new(&mmc_host_idr, host, &host->index);
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spin_unlock(&mmc_host_lock);
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if (err)
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goto free;
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snprintf(host->class_dev.bus_id, BUS_ID_SIZE,
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"mmc%d", host->index);
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host->parent = dev;
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host->class_dev.parent = dev;
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host->class_dev.class = &mmc_host_class;
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device_initialize(&host->class_dev);
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spin_lock_init(&host->lock);
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init_waitqueue_head(&host->wq);
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INIT_DELAYED_WORK(&host->detect, mmc_rescan);
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/*
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* By default, hosts do not support SGIO or large requests.
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* They have to set these according to their abilities.
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*/
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host->max_hw_segs = 1;
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host->max_phys_segs = 1;
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host->max_seg_size = PAGE_CACHE_SIZE;
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host->max_req_size = PAGE_CACHE_SIZE;
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host->max_blk_size = 512;
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host->max_blk_count = PAGE_CACHE_SIZE / 512;
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return host;
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free:
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kfree(host);
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return NULL;
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}
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EXPORT_SYMBOL(mmc_alloc_host);
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/**
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* mmc_add_host - initialise host hardware
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* @host: mmc host
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*
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* Register the host with the driver model. The host must be
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* prepared to start servicing requests before this function
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* completes.
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*/
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int mmc_add_host(struct mmc_host *host)
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{
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int err;
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WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
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!host->ops->enable_sdio_irq);
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led_trigger_register_simple(host->class_dev.bus_id, &host->led);
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err = device_add(&host->class_dev);
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if (err)
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return err;
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#ifdef CONFIG_DEBUG_FS
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mmc_add_host_debugfs(host);
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#endif
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mmc_start_host(host);
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return 0;
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}
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EXPORT_SYMBOL(mmc_add_host);
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/**
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* mmc_remove_host - remove host hardware
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* @host: mmc host
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*
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* Unregister and remove all cards associated with this host,
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* and power down the MMC bus. No new requests will be issued
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* after this function has returned.
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*/
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void mmc_remove_host(struct mmc_host *host)
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{
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mmc_stop_host(host);
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#ifdef CONFIG_DEBUG_FS
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mmc_remove_host_debugfs(host);
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#endif
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device_del(&host->class_dev);
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led_trigger_unregister_simple(host->led);
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}
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EXPORT_SYMBOL(mmc_remove_host);
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/**
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* mmc_free_host - free the host structure
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* @host: mmc host
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*
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* Free the host once all references to it have been dropped.
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*/
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void mmc_free_host(struct mmc_host *host)
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{
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spin_lock(&mmc_host_lock);
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idr_remove(&mmc_host_idr, host->index);
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spin_unlock(&mmc_host_lock);
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put_device(&host->class_dev);
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}
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EXPORT_SYMBOL(mmc_free_host);
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