*
* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
* SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
- * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
+ * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
* MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
#include <linux/delay.h>
#include <linux/pagemap.h>
#include <linux/err.h>
-#include <asm/scatterlist.h>
+#include <linux/leds.h>
#include <linux/scatterlist.h>
#include <linux/mmc/card.h>
#include "core.h"
#include "bus.h"
#include "host.h"
+#include "sdio_bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
#include "sdio_ops.h"
-extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
-extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
-extern int mmc_attach_sdio(struct mmc_host *host, u32 ocr);
-
static struct workqueue_struct *workqueue;
/*
+ * Enabling software CRCs on the data blocks can be a significant (30%)
+ * performance cost, and for other reasons may not always be desired.
+ * So we allow it it to be disabled.
+ */
+int use_spi_crc = 1;
+module_param(use_spi_crc, bool, 0);
+
+/*
* Internal function. Schedule delayed work in the MMC work queue.
*/
static int mmc_schedule_delayed_work(struct delayed_work *work,
struct mmc_command *cmd = mrq->cmd;
int err = cmd->error;
+ if (err && cmd->retries && mmc_host_is_spi(host)) {
+ if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
+ cmd->retries = 0;
+ }
+
if (err && cmd->retries) {
pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
mmc_hostname(host), cmd->opcode, err);
cmd->error = 0;
host->ops->request(host, mrq);
} else {
+ led_trigger_event(host->led, LED_OFF);
+
pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
mmc_hostname(host), cmd->opcode, err,
cmd->resp[0], cmd->resp[1],
{
#ifdef CONFIG_MMC_DEBUG
unsigned int i, sz;
+ struct scatterlist *sg;
#endif
pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
"tsac %d ms nsac %d\n",
mmc_hostname(host), mrq->data->blksz,
mrq->data->blocks, mrq->data->flags,
- mrq->data->timeout_ns / 10000000,
+ mrq->data->timeout_ns / 1000000,
mrq->data->timeout_clks);
}
WARN_ON(!host->claimed);
+ led_trigger_event(host->led, LED_FULL);
+
mrq->cmd->error = 0;
mrq->cmd->mrq = mrq;
if (mrq->data) {
#ifdef CONFIG_MMC_DEBUG
sz = 0;
- for (i = 0;i < mrq->data->sg_len;i++)
- sz += mrq->data->sg[i].length;
+ for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
+ sz += sg->length;
BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
#endif
{
struct mmc_request mrq;
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
memset(&mrq, 0, sizeof(struct mmc_request));
unsigned int mult;
/*
+ * SDIO cards only define an upper 1 s limit on access.
+ */
+ if (mmc_card_sdio(card)) {
+ data->timeout_ns = 1000000000;
+ data->timeout_clks = 0;
+ return;
+ }
+
+ /*
* SD cards use a 100 multiplier rather than 10
*/
mult = mmc_card_sd(card) ? 100 : 10;
EXPORT_SYMBOL(mmc_set_data_timeout);
/**
- * mmc_claim_host - exclusively claim a host
+ * mmc_align_data_size - pads a transfer size to a more optimal value
+ * @card: the MMC card associated with the data transfer
+ * @sz: original transfer size
+ *
+ * Pads the original data size with a number of extra bytes in
+ * order to avoid controller bugs and/or performance hits
+ * (e.g. some controllers revert to PIO for certain sizes).
+ *
+ * Returns the improved size, which might be unmodified.
+ *
+ * Note that this function is only relevant when issuing a
+ * single scatter gather entry.
+ */
+unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
+{
+ /*
+ * FIXME: We don't have a system for the controller to tell
+ * the core about its problems yet, so for now we just 32-bit
+ * align the size.
+ */
+ sz = ((sz + 3) / 4) * 4;
+
+ return sz;
+}
+EXPORT_SYMBOL(mmc_align_data_size);
+
+/**
+ * __mmc_claim_host - exclusively claim a host
* @host: mmc host to claim
+ * @abort: whether or not the operation should be aborted
*
- * Claim a host for a set of operations.
+ * Claim a host for a set of operations. If @abort is non null and
+ * dereference a non-zero value then this will return prematurely with
+ * that non-zero value without acquiring the lock. Returns zero
+ * with the lock held otherwise.
*/
-void mmc_claim_host(struct mmc_host *host)
+int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long flags;
+ int stop;
might_sleep();
spin_lock_irqsave(&host->lock, flags);
while (1) {
set_current_state(TASK_UNINTERRUPTIBLE);
- if (!host->claimed)
+ stop = abort ? atomic_read(abort) : 0;
+ if (stop || !host->claimed)
break;
spin_unlock_irqrestore(&host->lock, flags);
schedule();
spin_lock_irqsave(&host->lock, flags);
}
set_current_state(TASK_RUNNING);
- host->claimed = 1;
+ if (!stop)
+ host->claimed = 1;
+ else
+ wake_up(&host->wq);
spin_unlock_irqrestore(&host->lock, flags);
remove_wait_queue(&host->wq, &wait);
+ return stop;
}
-EXPORT_SYMBOL(mmc_claim_host);
+EXPORT_SYMBOL(__mmc_claim_host);
/**
* mmc_release_host - release a host
{
unsigned long flags;
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
spin_lock_irqsave(&host->lock, flags);
host->claimed = 0;
int bit = fls(host->ocr_avail) - 1;
host->ios.vdd = bit;
- host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
- host->ios.chip_select = MMC_CS_DONTCARE;
+ if (mmc_host_is_spi(host)) {
+ host->ios.chip_select = MMC_CS_HIGH;
+ host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
+ } else {
+ host->ios.chip_select = MMC_CS_DONTCARE;
+ host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+ }
host->ios.power_mode = MMC_POWER_UP;
host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ios.timing = MMC_TIMING_LEGACY;
mmc_set_ios(host);
- mmc_delay(1);
+ /*
+ * This delay should be sufficient to allow the power supply
+ * to reach the minimum voltage.
+ */
+ mmc_delay(2);
host->ios.clock = host->f_min;
host->ios.power_mode = MMC_POWER_ON;
mmc_set_ios(host);
+ /*
+ * This delay must be at least 74 clock sizes, or 1 ms, or the
+ * time required to reach a stable voltage.
+ */
mmc_delay(2);
}
{
host->ios.clock = 0;
host->ios.vdd = 0;
- host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
- host->ios.chip_select = MMC_CS_DONTCARE;
+ if (!mmc_host_is_spi(host)) {
+ host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+ host->ios.chip_select = MMC_CS_DONTCARE;
+ }
host->ios.power_mode = MMC_POWER_OFF;
host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ios.timing = MMC_TIMING_LEGACY;
/*
* Cleanup when the last reference to the bus operator is dropped.
*/
-void __mmc_release_bus(struct mmc_host *host)
+static void __mmc_release_bus(struct mmc_host *host)
{
BUG_ON(!host);
BUG_ON(host->bus_refs);
BUG_ON(!host);
BUG_ON(!ops);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
spin_lock_irqsave(&host->lock, flags);
BUG_ON(!host);
- BUG_ON(!host->claimed);
- BUG_ON(!host->bus_ops);
+ WARN_ON(!host->claimed);
+ WARN_ON(!host->bus_ops);
spin_lock_irqsave(&host->lock, flags);
#ifdef CONFIG_MMC_DEBUG
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
- BUG_ON(host->removed);
+ WARN_ON(host->removed);
spin_unlock_irqrestore(&host->lock, flags);
#endif
*/
mmc_bus_put(host);
+ if (host->ops->get_cd && host->ops->get_cd(host) == 0)
+ goto out;
+
mmc_claim_host(host);
mmc_power_up(host);
if (!err) {
if (mmc_attach_sdio(host, ocr))
mmc_power_off(host);
- return;
+ goto out;
}
/*
if (!err) {
if (mmc_attach_sd(host, ocr))
mmc_power_off(host);
- return;
+ goto out;
}
/*
if (!err) {
if (mmc_attach_mmc(host, ocr))
mmc_power_off(host);
- return;
+ goto out;
}
mmc_release_host(host);
mmc_bus_put(host);
}
+out:
+ if (host->caps & MMC_CAP_NEEDS_POLL)
+ mmc_schedule_delayed_work(&host->detect, HZ);
}
void mmc_start_host(struct mmc_host *host)
return -ENOMEM;
ret = mmc_register_bus();
- if (ret == 0) {
- ret = mmc_register_host_class();
- if (ret)
- mmc_unregister_bus();
- }
+ if (ret)
+ goto destroy_workqueue;
+
+ ret = mmc_register_host_class();
+ if (ret)
+ goto unregister_bus;
+
+ ret = sdio_register_bus();
+ if (ret)
+ goto unregister_host_class;
+
+ return 0;
+
+unregister_host_class:
+ mmc_unregister_host_class();
+unregister_bus:
+ mmc_unregister_bus();
+destroy_workqueue:
+ destroy_workqueue(workqueue);
+
return ret;
}
static void __exit mmc_exit(void)
{
+ sdio_unregister_bus();
mmc_unregister_host_class();
mmc_unregister_bus();
destroy_workqueue(workqueue);
}
-module_init(mmc_init);
+subsys_initcall(mmc_init);
module_exit(mmc_exit);
MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff