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mmc: sdhci: introduce get_ro private write-protect hook

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Some controllers handle their write-protection differently. Introduce a
callback to be able to handle it, ensuring the same locking takes place
for it. Rename the status variable to make it more obvious why the read
from the registers needs to be inverted.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Wolfram Sang 2010-10-15 12:21:01 +02:00 committed by Chris Ball
parent d3b993dcc1
commit 2dfb579c7d
2 changed files with 10 additions and 6 deletions
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15
drivers/mmc/host/sdhci.c
View file

@ -1223,22 +1223,25 @@ static int sdhci_get_ro(struct mmc_host *mmc)
{
struct sdhci_host *host;
unsigned long flags;
int present;
int is_readonly;
host = mmc_priv(mmc);
spin_lock_irqsave(&host->lock, flags);
if (host->flags & SDHCI_DEVICE_DEAD)
present = 0;
is_readonly = 0;
else if (host->ops->get_ro)
is_readonly = host->ops->get_ro(host);
else
present = sdhci_readl(host, SDHCI_PRESENT_STATE);
is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
& SDHCI_WRITE_PROTECT);
spin_unlock_irqrestore(&host->lock, flags);
if (host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT)
return !!(present & SDHCI_WRITE_PROTECT);
return !(present & SDHCI_WRITE_PROTECT);
/* This quirk needs to be replaced by a callback-function later */
return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
!is_readonly : is_readonly;
}
static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)

1
drivers/mmc/host/sdhci.h
View file

@ -214,6 +214,7 @@ struct sdhci_ops {
unsigned int (*get_timeout_clock)(struct sdhci_host *host);
void (*platform_send_init_74_clocks)(struct sdhci_host *host,
u8 power_mode);
unsigned int (*get_ro)(struct sdhci_host *host);
};
#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS