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[MMC] support for mmc chip select in wbsd

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Use the chip select ios in the wbsd driver.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Pierre Ossman 2005-09-03 16:45:49 +01:00 committed by Russell King
parent 865e9f13c9
commit 1656fa579e
2 changed files with 52 additions and 15 deletions
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64
drivers/mmc/wbsd.c
View File

@ -42,7 +42,7 @@
#include "wbsd.h"
#define DRIVER_NAME "wbsd"
#define DRIVER_VERSION "1.3"
#define DRIVER_VERSION "1.4"
#ifdef CONFIG_MMC_DEBUG
#define DBG(x...) \
@ -960,8 +960,9 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
struct wbsd_host* host = mmc_priv(mmc);
u8 clk, setup, pwr;
DBGF("clock %uHz busmode %u powermode %u Vdd %u\n",
ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u\n",
ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
ios->vdd);
spin_lock_bh(&host->lock);
@ -1003,13 +1004,11 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
/*
* MMC cards need to have pin 1 high during init.
* Init time corresponds rather nicely with the bus mode.
* It wreaks havoc with the card detection though so
* that needs to be disabed.
* that needs to be disabled.
*/
setup = wbsd_read_index(host, WBSD_IDX_SETUP);
if ((ios->power_mode == MMC_POWER_ON) &&
(ios->bus_mode == MMC_BUSMODE_OPENDRAIN))
if (ios->chip_select == MMC_CS_HIGH)
{
setup |= WBSD_DAT3_H;
host->flags |= WBSD_FIGNORE_DETECT;
@ -1017,7 +1016,12 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
else
{
setup &= ~WBSD_DAT3_H;
host->flags &= ~WBSD_FIGNORE_DETECT;
/*
* We cannot resume card detection immediatly
* because of capacitance and delays in the chip.
*/
mod_timer(&host->ignore_timer, jiffies + HZ/100);
}
wbsd_write_index(host, WBSD_IDX_SETUP, setup);
@ -1035,6 +1039,31 @@ static struct mmc_host_ops wbsd_ops = {
* *
\*****************************************************************************/
/*
* Helper function to reset detection ignore
*/
static void wbsd_reset_ignore(unsigned long data)
{
struct wbsd_host *host = (struct wbsd_host*)data;
BUG_ON(host == NULL);
DBG("Resetting card detection ignore\n");
spin_lock_bh(&host->lock);
host->flags &= ~WBSD_FIGNORE_DETECT;
/*
* Card status might have changed during the
* blackout.
*/
tasklet_schedule(&host->card_tasklet);
spin_unlock_bh(&host->lock);
}
/*
* Helper function for card detection
*/
@ -1097,7 +1126,7 @@ static void wbsd_tasklet_card(unsigned long param)
* Delay card detection to allow electrical connections
* to stabilise.
*/
mod_timer(&host->timer, jiffies + HZ/2);
mod_timer(&host->detect_timer, jiffies + HZ/2);
}
spin_unlock(&host->lock);
@ -1124,6 +1153,8 @@ static void wbsd_tasklet_card(unsigned long param)
mmc_detect_change(host->mmc);
}
else
spin_unlock(&host->lock);
}
static void wbsd_tasklet_fifo(unsigned long param)
@ -1328,11 +1359,15 @@ static int __devinit wbsd_alloc_mmc(struct device* dev)
spin_lock_init(&host->lock);
/*
* Set up detection timer
* Set up timers
*/
init_timer(&host->timer);
host->timer.data = (unsigned long)host;
host->timer.function = wbsd_detect_card;
init_timer(&host->detect_timer);
host->detect_timer.data = (unsigned long)host;
host->detect_timer.function = wbsd_detect_card;
init_timer(&host->ignore_timer);
host->ignore_timer.data = (unsigned long)host;
host->ignore_timer.function = wbsd_reset_ignore;
/*
* Maximum number of segments. Worst case is one sector per segment
@ -1370,7 +1405,8 @@ static void __devexit wbsd_free_mmc(struct device* dev)
host = mmc_priv(mmc);
BUG_ON(host == NULL);
del_timer_sync(&host->timer);
del_timer_sync(&host->ignore_timer);
del_timer_sync(&host->detect_timer);
mmc_free_host(mmc);

3
drivers/mmc/wbsd.h
View File

@ -181,5 +181,6 @@ struct wbsd_host
struct tasklet_struct finish_tasklet;
struct tasklet_struct block_tasklet;
struct timer_list timer; /* Card detection timer */
struct timer_list detect_timer; /* Card detection timer */
struct timer_list ignore_timer; /* Ignore detection timer */
};