![Linus Torvalds](/assets/img/avatar_default.png)
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc: (42 commits) atmel-mci: fix sdc_reg typo tmio_mmc: add maintainer mmc: Add OpenFirmware bindings for SDHCI driver sdhci: Add quirk for forcing maximum block size to 2048 bytes sdhci: Add quirk for controllers that need IRQ re-init after reset sdhci: Add quirk for controllers that need small delays for PIO sdhci: Add set_clock callback and a quirk for nonstandard clocks sdhci: Add get_{max,timeout}_clock callbacks sdhci: Add support for hosts reporting inverted write-protect state sdhci: Add support for card-detection polling sdhci: Enable only relevant (DMA/PIO) interrupts during transfers sdhci: Split card-detection IRQs management from sdhci_init() sdhci: Add support for bus-specific IO memory accessors mmc_spi: adjust for delayed data token response omap_hsmmc: Wait for SDBP omap_hsmmc: Fix MMC3 dma omap_hsmmc: Disable SDBP at suspend omap_hsmmc: Do not prefix slot name omap_hsmmc: Allow cover switch to cause rescan omap_hsmmc: Add 8-bit bus width mode support ...
1058 lines
24 KiB
C
1058 lines
24 KiB
C
/*
|
|
* linux/drivers/mmc/core/core.c
|
|
*
|
|
* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
|
|
* SD support Copyright (C) 2004 Ian Molton, 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
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/err.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/log2.h>
|
|
#include <linux/regulator/consumer.h>
|
|
|
|
#include <linux/mmc/card.h>
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mmc/mmc.h>
|
|
#include <linux/mmc/sd.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"
|
|
|
|
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,
|
|
unsigned long delay)
|
|
{
|
|
return queue_delayed_work(workqueue, work, delay);
|
|
}
|
|
|
|
/*
|
|
* Internal function. Flush all scheduled work from the MMC work queue.
|
|
*/
|
|
static void mmc_flush_scheduled_work(void)
|
|
{
|
|
flush_workqueue(workqueue);
|
|
}
|
|
|
|
/**
|
|
* mmc_request_done - finish processing an MMC request
|
|
* @host: MMC host which completed request
|
|
* @mrq: MMC request which request
|
|
*
|
|
* MMC drivers should call this function when they have completed
|
|
* their processing of a request.
|
|
*/
|
|
void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
|
|
{
|
|
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->retries--;
|
|
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],
|
|
cmd->resp[2], cmd->resp[3]);
|
|
|
|
if (mrq->data) {
|
|
pr_debug("%s: %d bytes transferred: %d\n",
|
|
mmc_hostname(host),
|
|
mrq->data->bytes_xfered, mrq->data->error);
|
|
}
|
|
|
|
if (mrq->stop) {
|
|
pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
|
|
mmc_hostname(host), mrq->stop->opcode,
|
|
mrq->stop->error,
|
|
mrq->stop->resp[0], mrq->stop->resp[1],
|
|
mrq->stop->resp[2], mrq->stop->resp[3]);
|
|
}
|
|
|
|
if (mrq->done)
|
|
mrq->done(mrq);
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_request_done);
|
|
|
|
static void
|
|
mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
|
|
{
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
unsigned int i, sz;
|
|
struct scatterlist *sg;
|
|
#endif
|
|
|
|
pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
|
|
mmc_hostname(host), mrq->cmd->opcode,
|
|
mrq->cmd->arg, mrq->cmd->flags);
|
|
|
|
if (mrq->data) {
|
|
pr_debug("%s: blksz %d blocks %d flags %08x "
|
|
"tsac %d ms nsac %d\n",
|
|
mmc_hostname(host), mrq->data->blksz,
|
|
mrq->data->blocks, mrq->data->flags,
|
|
mrq->data->timeout_ns / 1000000,
|
|
mrq->data->timeout_clks);
|
|
}
|
|
|
|
if (mrq->stop) {
|
|
pr_debug("%s: CMD%u arg %08x flags %08x\n",
|
|
mmc_hostname(host), mrq->stop->opcode,
|
|
mrq->stop->arg, mrq->stop->flags);
|
|
}
|
|
|
|
WARN_ON(!host->claimed);
|
|
|
|
led_trigger_event(host->led, LED_FULL);
|
|
|
|
mrq->cmd->error = 0;
|
|
mrq->cmd->mrq = mrq;
|
|
if (mrq->data) {
|
|
BUG_ON(mrq->data->blksz > host->max_blk_size);
|
|
BUG_ON(mrq->data->blocks > host->max_blk_count);
|
|
BUG_ON(mrq->data->blocks * mrq->data->blksz >
|
|
host->max_req_size);
|
|
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
sz = 0;
|
|
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
|
|
|
|
mrq->cmd->data = mrq->data;
|
|
mrq->data->error = 0;
|
|
mrq->data->mrq = mrq;
|
|
if (mrq->stop) {
|
|
mrq->data->stop = mrq->stop;
|
|
mrq->stop->error = 0;
|
|
mrq->stop->mrq = mrq;
|
|
}
|
|
}
|
|
host->ops->request(host, mrq);
|
|
}
|
|
|
|
static void mmc_wait_done(struct mmc_request *mrq)
|
|
{
|
|
complete(mrq->done_data);
|
|
}
|
|
|
|
/**
|
|
* mmc_wait_for_req - start a request and wait for completion
|
|
* @host: MMC host to start command
|
|
* @mrq: MMC request to start
|
|
*
|
|
* Start a new MMC custom command request for a host, and wait
|
|
* for the command to complete. Does not attempt to parse the
|
|
* response.
|
|
*/
|
|
void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(complete);
|
|
|
|
mrq->done_data = &complete;
|
|
mrq->done = mmc_wait_done;
|
|
|
|
mmc_start_request(host, mrq);
|
|
|
|
wait_for_completion(&complete);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_wait_for_req);
|
|
|
|
/**
|
|
* mmc_wait_for_cmd - start a command and wait for completion
|
|
* @host: MMC host to start command
|
|
* @cmd: MMC command to start
|
|
* @retries: maximum number of retries
|
|
*
|
|
* Start a new MMC command for a host, and wait for the command
|
|
* to complete. Return any error that occurred while the command
|
|
* was executing. Do not attempt to parse the response.
|
|
*/
|
|
int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
|
|
{
|
|
struct mmc_request mrq;
|
|
|
|
WARN_ON(!host->claimed);
|
|
|
|
memset(&mrq, 0, sizeof(struct mmc_request));
|
|
|
|
memset(cmd->resp, 0, sizeof(cmd->resp));
|
|
cmd->retries = retries;
|
|
|
|
mrq.cmd = cmd;
|
|
cmd->data = NULL;
|
|
|
|
mmc_wait_for_req(host, &mrq);
|
|
|
|
return cmd->error;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_wait_for_cmd);
|
|
|
|
/**
|
|
* mmc_set_data_timeout - set the timeout for a data command
|
|
* @data: data phase for command
|
|
* @card: the MMC card associated with the data transfer
|
|
*
|
|
* Computes the data timeout parameters according to the
|
|
* correct algorithm given the card type.
|
|
*/
|
|
void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
|
|
{
|
|
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;
|
|
|
|
/*
|
|
* Scale up the multiplier (and therefore the timeout) by
|
|
* the r2w factor for writes.
|
|
*/
|
|
if (data->flags & MMC_DATA_WRITE)
|
|
mult <<= card->csd.r2w_factor;
|
|
|
|
data->timeout_ns = card->csd.tacc_ns * mult;
|
|
data->timeout_clks = card->csd.tacc_clks * mult;
|
|
|
|
/*
|
|
* SD cards also have an upper limit on the timeout.
|
|
*/
|
|
if (mmc_card_sd(card)) {
|
|
unsigned int timeout_us, limit_us;
|
|
|
|
timeout_us = data->timeout_ns / 1000;
|
|
timeout_us += data->timeout_clks * 1000 /
|
|
(card->host->ios.clock / 1000);
|
|
|
|
if (data->flags & MMC_DATA_WRITE)
|
|
/*
|
|
* The limit is really 250 ms, but that is
|
|
* insufficient for some crappy cards.
|
|
*/
|
|
limit_us = 300000;
|
|
else
|
|
limit_us = 100000;
|
|
|
|
/*
|
|
* SDHC cards always use these fixed values.
|
|
*/
|
|
if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
|
|
data->timeout_ns = limit_us * 1000;
|
|
data->timeout_clks = 0;
|
|
}
|
|
}
|
|
/*
|
|
* Some cards need very high timeouts if driven in SPI mode.
|
|
* The worst observed timeout was 900ms after writing a
|
|
* continuous stream of data until the internal logic
|
|
* overflowed.
|
|
*/
|
|
if (mmc_host_is_spi(card->host)) {
|
|
if (data->flags & MMC_DATA_WRITE) {
|
|
if (data->timeout_ns < 1000000000)
|
|
data->timeout_ns = 1000000000; /* 1s */
|
|
} else {
|
|
if (data->timeout_ns < 100000000)
|
|
data->timeout_ns = 100000000; /* 100ms */
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(mmc_set_data_timeout);
|
|
|
|
/**
|
|
* 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. 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.
|
|
*/
|
|
int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
unsigned long flags;
|
|
int stop;
|
|
|
|
might_sleep();
|
|
|
|
add_wait_queue(&host->wq, &wait);
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
while (1) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
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);
|
|
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);
|
|
|
|
/**
|
|
* mmc_release_host - release a host
|
|
* @host: mmc host to release
|
|
*
|
|
* Release a MMC host, allowing others to claim the host
|
|
* for their operations.
|
|
*/
|
|
void mmc_release_host(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
WARN_ON(!host->claimed);
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->claimed = 0;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
wake_up(&host->wq);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_release_host);
|
|
|
|
/*
|
|
* Internal function that does the actual ios call to the host driver,
|
|
* optionally printing some debug output.
|
|
*/
|
|
static inline void mmc_set_ios(struct mmc_host *host)
|
|
{
|
|
struct mmc_ios *ios = &host->ios;
|
|
|
|
pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
|
|
"width %u timing %u\n",
|
|
mmc_hostname(host), ios->clock, ios->bus_mode,
|
|
ios->power_mode, ios->chip_select, ios->vdd,
|
|
ios->bus_width, ios->timing);
|
|
|
|
host->ops->set_ios(host, ios);
|
|
}
|
|
|
|
/*
|
|
* Control chip select pin on a host.
|
|
*/
|
|
void mmc_set_chip_select(struct mmc_host *host, int mode)
|
|
{
|
|
host->ios.chip_select = mode;
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
/*
|
|
* Sets the host clock to the highest possible frequency that
|
|
* is below "hz".
|
|
*/
|
|
void mmc_set_clock(struct mmc_host *host, unsigned int hz)
|
|
{
|
|
WARN_ON(hz < host->f_min);
|
|
|
|
if (hz > host->f_max)
|
|
hz = host->f_max;
|
|
|
|
host->ios.clock = hz;
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
/*
|
|
* Change the bus mode (open drain/push-pull) of a host.
|
|
*/
|
|
void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
|
|
{
|
|
host->ios.bus_mode = mode;
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
/*
|
|
* Change data bus width of a host.
|
|
*/
|
|
void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
|
|
{
|
|
host->ios.bus_width = width;
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
/**
|
|
* mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
|
|
* @vdd: voltage (mV)
|
|
* @low_bits: prefer low bits in boundary cases
|
|
*
|
|
* This function returns the OCR bit number according to the provided @vdd
|
|
* value. If conversion is not possible a negative errno value returned.
|
|
*
|
|
* Depending on the @low_bits flag the function prefers low or high OCR bits
|
|
* on boundary voltages. For example,
|
|
* with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
|
|
* with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
|
|
*
|
|
* Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
|
|
*/
|
|
static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
|
|
{
|
|
const int max_bit = ilog2(MMC_VDD_35_36);
|
|
int bit;
|
|
|
|
if (vdd < 1650 || vdd > 3600)
|
|
return -EINVAL;
|
|
|
|
if (vdd >= 1650 && vdd <= 1950)
|
|
return ilog2(MMC_VDD_165_195);
|
|
|
|
if (low_bits)
|
|
vdd -= 1;
|
|
|
|
/* Base 2000 mV, step 100 mV, bit's base 8. */
|
|
bit = (vdd - 2000) / 100 + 8;
|
|
if (bit > max_bit)
|
|
return max_bit;
|
|
return bit;
|
|
}
|
|
|
|
/**
|
|
* mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
|
|
* @vdd_min: minimum voltage value (mV)
|
|
* @vdd_max: maximum voltage value (mV)
|
|
*
|
|
* This function returns the OCR mask bits according to the provided @vdd_min
|
|
* and @vdd_max values. If conversion is not possible the function returns 0.
|
|
*
|
|
* Notes wrt boundary cases:
|
|
* This function sets the OCR bits for all boundary voltages, for example
|
|
* [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
|
|
* MMC_VDD_34_35 mask.
|
|
*/
|
|
u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
|
|
{
|
|
u32 mask = 0;
|
|
|
|
if (vdd_max < vdd_min)
|
|
return 0;
|
|
|
|
/* Prefer high bits for the boundary vdd_max values. */
|
|
vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
|
|
if (vdd_max < 0)
|
|
return 0;
|
|
|
|
/* Prefer low bits for the boundary vdd_min values. */
|
|
vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
|
|
if (vdd_min < 0)
|
|
return 0;
|
|
|
|
/* Fill the mask, from max bit to min bit. */
|
|
while (vdd_max >= vdd_min)
|
|
mask |= 1 << vdd_max--;
|
|
|
|
return mask;
|
|
}
|
|
EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
|
|
|
|
#ifdef CONFIG_REGULATOR
|
|
|
|
/**
|
|
* mmc_regulator_get_ocrmask - return mask of supported voltages
|
|
* @supply: regulator to use
|
|
*
|
|
* This returns either a negative errno, or a mask of voltages that
|
|
* can be provided to MMC/SD/SDIO devices using the specified voltage
|
|
* regulator. This would normally be called before registering the
|
|
* MMC host adapter.
|
|
*/
|
|
int mmc_regulator_get_ocrmask(struct regulator *supply)
|
|
{
|
|
int result = 0;
|
|
int count;
|
|
int i;
|
|
|
|
count = regulator_count_voltages(supply);
|
|
if (count < 0)
|
|
return count;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
int vdd_uV;
|
|
int vdd_mV;
|
|
|
|
vdd_uV = regulator_list_voltage(supply, i);
|
|
if (vdd_uV <= 0)
|
|
continue;
|
|
|
|
vdd_mV = vdd_uV / 1000;
|
|
result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
|
|
|
|
/**
|
|
* mmc_regulator_set_ocr - set regulator to match host->ios voltage
|
|
* @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
|
|
* @supply: regulator to use
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*
|
|
* MMC host drivers may use this to enable or disable a regulator using
|
|
* a particular supply voltage. This would normally be called from the
|
|
* set_ios() method.
|
|
*/
|
|
int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit)
|
|
{
|
|
int result = 0;
|
|
int min_uV, max_uV;
|
|
int enabled;
|
|
|
|
enabled = regulator_is_enabled(supply);
|
|
if (enabled < 0)
|
|
return enabled;
|
|
|
|
if (vdd_bit) {
|
|
int tmp;
|
|
int voltage;
|
|
|
|
/* REVISIT mmc_vddrange_to_ocrmask() may have set some
|
|
* bits this regulator doesn't quite support ... don't
|
|
* be too picky, most cards and regulators are OK with
|
|
* a 0.1V range goof (it's a small error percentage).
|
|
*/
|
|
tmp = vdd_bit - ilog2(MMC_VDD_165_195);
|
|
if (tmp == 0) {
|
|
min_uV = 1650 * 1000;
|
|
max_uV = 1950 * 1000;
|
|
} else {
|
|
min_uV = 1900 * 1000 + tmp * 100 * 1000;
|
|
max_uV = min_uV + 100 * 1000;
|
|
}
|
|
|
|
/* avoid needless changes to this voltage; the regulator
|
|
* might not allow this operation
|
|
*/
|
|
voltage = regulator_get_voltage(supply);
|
|
if (voltage < 0)
|
|
result = voltage;
|
|
else if (voltage < min_uV || voltage > max_uV)
|
|
result = regulator_set_voltage(supply, min_uV, max_uV);
|
|
else
|
|
result = 0;
|
|
|
|
if (result == 0 && !enabled)
|
|
result = regulator_enable(supply);
|
|
} else if (enabled) {
|
|
result = regulator_disable(supply);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL(mmc_regulator_set_ocr);
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Mask off any voltages we don't support and select
|
|
* the lowest voltage
|
|
*/
|
|
u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
|
|
{
|
|
int bit;
|
|
|
|
ocr &= host->ocr_avail;
|
|
|
|
bit = ffs(ocr);
|
|
if (bit) {
|
|
bit -= 1;
|
|
|
|
ocr &= 3 << bit;
|
|
|
|
host->ios.vdd = bit;
|
|
mmc_set_ios(host);
|
|
} else {
|
|
pr_warning("%s: host doesn't support card's voltages\n",
|
|
mmc_hostname(host));
|
|
ocr = 0;
|
|
}
|
|
|
|
return ocr;
|
|
}
|
|
|
|
/*
|
|
* Select timing parameters for host.
|
|
*/
|
|
void mmc_set_timing(struct mmc_host *host, unsigned int timing)
|
|
{
|
|
host->ios.timing = timing;
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
/*
|
|
* Apply power to the MMC stack. This is a two-stage process.
|
|
* First, we enable power to the card without the clock running.
|
|
* We then wait a bit for the power to stabilise. Finally,
|
|
* enable the bus drivers and clock to the card.
|
|
*
|
|
* We must _NOT_ enable the clock prior to power stablising.
|
|
*
|
|
* If a host does all the power sequencing itself, ignore the
|
|
* initial MMC_POWER_UP stage.
|
|
*/
|
|
static void mmc_power_up(struct mmc_host *host)
|
|
{
|
|
int bit = fls(host->ocr_avail) - 1;
|
|
|
|
host->ios.vdd = bit;
|
|
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);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
static void mmc_power_off(struct mmc_host *host)
|
|
{
|
|
host->ios.clock = 0;
|
|
host->ios.vdd = 0;
|
|
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;
|
|
mmc_set_ios(host);
|
|
}
|
|
|
|
/*
|
|
* Cleanup when the last reference to the bus operator is dropped.
|
|
*/
|
|
static void __mmc_release_bus(struct mmc_host *host)
|
|
{
|
|
BUG_ON(!host);
|
|
BUG_ON(host->bus_refs);
|
|
BUG_ON(!host->bus_dead);
|
|
|
|
host->bus_ops = NULL;
|
|
}
|
|
|
|
/*
|
|
* Increase reference count of bus operator
|
|
*/
|
|
static inline void mmc_bus_get(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->bus_refs++;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Decrease reference count of bus operator and free it if
|
|
* it is the last reference.
|
|
*/
|
|
static inline void mmc_bus_put(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->bus_refs--;
|
|
if ((host->bus_refs == 0) && host->bus_ops)
|
|
__mmc_release_bus(host);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Assign a mmc bus handler to a host. Only one bus handler may control a
|
|
* host at any given time.
|
|
*/
|
|
void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
|
|
{
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!host);
|
|
BUG_ON(!ops);
|
|
|
|
WARN_ON(!host->claimed);
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
BUG_ON(host->bus_ops);
|
|
BUG_ON(host->bus_refs);
|
|
|
|
host->bus_ops = ops;
|
|
host->bus_refs = 1;
|
|
host->bus_dead = 0;
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Remove the current bus handler from a host. Assumes that there are
|
|
* no interesting cards left, so the bus is powered down.
|
|
*/
|
|
void mmc_detach_bus(struct mmc_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!host);
|
|
|
|
WARN_ON(!host->claimed);
|
|
WARN_ON(!host->bus_ops);
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
host->bus_dead = 1;
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
mmc_power_off(host);
|
|
|
|
mmc_bus_put(host);
|
|
}
|
|
|
|
/**
|
|
* mmc_detect_change - process change of state on a MMC socket
|
|
* @host: host which changed state.
|
|
* @delay: optional delay to wait before detection (jiffies)
|
|
*
|
|
* MMC drivers should call this when they detect a card has been
|
|
* inserted or removed. The MMC layer will confirm that any
|
|
* present card is still functional, and initialize any newly
|
|
* inserted.
|
|
*/
|
|
void mmc_detect_change(struct mmc_host *host, unsigned long delay)
|
|
{
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
WARN_ON(host->removed);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
#endif
|
|
|
|
mmc_schedule_delayed_work(&host->detect, delay);
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_detect_change);
|
|
|
|
|
|
void mmc_rescan(struct work_struct *work)
|
|
{
|
|
struct mmc_host *host =
|
|
container_of(work, struct mmc_host, detect.work);
|
|
u32 ocr;
|
|
int err;
|
|
|
|
mmc_bus_get(host);
|
|
|
|
if (host->bus_ops == NULL) {
|
|
/*
|
|
* Only we can add a new handler, so it's safe to
|
|
* release the lock here.
|
|
*/
|
|
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);
|
|
mmc_go_idle(host);
|
|
|
|
mmc_send_if_cond(host, host->ocr_avail);
|
|
|
|
/*
|
|
* First we search for SDIO...
|
|
*/
|
|
err = mmc_send_io_op_cond(host, 0, &ocr);
|
|
if (!err) {
|
|
if (mmc_attach_sdio(host, ocr))
|
|
mmc_power_off(host);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* ...then normal SD...
|
|
*/
|
|
err = mmc_send_app_op_cond(host, 0, &ocr);
|
|
if (!err) {
|
|
if (mmc_attach_sd(host, ocr))
|
|
mmc_power_off(host);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* ...and finally MMC.
|
|
*/
|
|
err = mmc_send_op_cond(host, 0, &ocr);
|
|
if (!err) {
|
|
if (mmc_attach_mmc(host, ocr))
|
|
mmc_power_off(host);
|
|
goto out;
|
|
}
|
|
|
|
mmc_release_host(host);
|
|
mmc_power_off(host);
|
|
} else {
|
|
if (host->bus_ops->detect && !host->bus_dead)
|
|
host->bus_ops->detect(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)
|
|
{
|
|
mmc_power_off(host);
|
|
mmc_detect_change(host, 0);
|
|
}
|
|
|
|
void mmc_stop_host(struct mmc_host *host)
|
|
{
|
|
#ifdef CONFIG_MMC_DEBUG
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
host->removed = 1;
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
#endif
|
|
|
|
cancel_delayed_work(&host->detect);
|
|
mmc_flush_scheduled_work();
|
|
|
|
mmc_bus_get(host);
|
|
if (host->bus_ops && !host->bus_dead) {
|
|
if (host->bus_ops->remove)
|
|
host->bus_ops->remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
}
|
|
mmc_bus_put(host);
|
|
|
|
BUG_ON(host->card);
|
|
|
|
mmc_power_off(host);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
/**
|
|
* mmc_suspend_host - suspend a host
|
|
* @host: mmc host
|
|
* @state: suspend mode (PM_SUSPEND_xxx)
|
|
*/
|
|
int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
|
|
{
|
|
cancel_delayed_work(&host->detect);
|
|
mmc_flush_scheduled_work();
|
|
|
|
mmc_bus_get(host);
|
|
if (host->bus_ops && !host->bus_dead) {
|
|
if (host->bus_ops->suspend)
|
|
host->bus_ops->suspend(host);
|
|
if (!host->bus_ops->resume) {
|
|
if (host->bus_ops->remove)
|
|
host->bus_ops->remove(host);
|
|
|
|
mmc_claim_host(host);
|
|
mmc_detach_bus(host);
|
|
mmc_release_host(host);
|
|
}
|
|
}
|
|
mmc_bus_put(host);
|
|
|
|
mmc_power_off(host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_suspend_host);
|
|
|
|
/**
|
|
* mmc_resume_host - resume a previously suspended host
|
|
* @host: mmc host
|
|
*/
|
|
int mmc_resume_host(struct mmc_host *host)
|
|
{
|
|
mmc_bus_get(host);
|
|
if (host->bus_ops && !host->bus_dead) {
|
|
mmc_power_up(host);
|
|
mmc_select_voltage(host, host->ocr);
|
|
BUG_ON(!host->bus_ops->resume);
|
|
host->bus_ops->resume(host);
|
|
}
|
|
mmc_bus_put(host);
|
|
|
|
/*
|
|
* We add a slight delay here so that resume can progress
|
|
* in parallel.
|
|
*/
|
|
mmc_detect_change(host, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(mmc_resume_host);
|
|
|
|
#endif
|
|
|
|
static int __init mmc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
workqueue = create_singlethread_workqueue("kmmcd");
|
|
if (!workqueue)
|
|
return -ENOMEM;
|
|
|
|
ret = mmc_register_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);
|
|
}
|
|
|
|
subsys_initcall(mmc_init);
|
|
module_exit(mmc_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|