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authorMarc Pignat <marc.pignat@hevs.ch>2008-05-30 14:07:47 +0200
committerPierre Ossman <drzeus@drzeus.cx>2008-07-15 14:14:42 +0200
commitc5a89c6c0805959f813e8342d6f4040860f6d7db (patch)
treeb6f0e3071d44196d1dd8dc5775e42996185a49b9 /drivers
parente181dce8acab4f7d7c4772d2a8281510d503ab21 (diff)
mmc: at91_mci: avoid timeouts
The at91 mci controller internal state machine seems to often crash. This can be fixed by resetting the controller after each command for at91rm9200 and by setting the MCI_BLKR register on at91sam926*. Signed-off-by: Marc Pignat <marc.pignat@hevs.ch> Signed-off-by: Hans J Koch <hjk@linutronix.de> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mmc/host/at91_mci.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index fce171c7c67..e9242110ce2 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -130,6 +130,43 @@ struct at91mci_host
struct timer_list timer;
};
+/*
+ * Reset the controller and restore most of the state
+ */
+static void at91_reset_host(struct at91mci_host *host)
+{
+ unsigned long flags;
+ u32 mr;
+ u32 sdcr;
+ u32 dtor;
+ u32 imr;
+
+ local_irq_save(flags);
+ imr = at91_mci_read(host, AT91_MCI_IMR);
+
+ at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
+
+ /* save current state */
+ mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;
+ sdcr = at91_mci_read(host, AT91_MCI_SDCR);
+ dtor = at91_mci_read(host, AT91_MCI_DTOR);
+
+ /* reset the controller */
+ at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIDIS | AT91_MCI_SWRST);
+
+ /* restore state */
+ at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
+ at91_mci_write(host, AT91_MCI_MR, mr);
+ at91_mci_write(host, AT91_MCI_SDCR, sdcr);
+ at91_mci_write(host, AT91_MCI_DTOR, dtor);
+ at91_mci_write(host, AT91_MCI_IER, imr);
+
+ /* make sure sdio interrupts will fire */
+ at91_mci_read(host, AT91_MCI_SR);
+
+ local_irq_restore(flags);
+}
+
static void at91_timeout_timer(unsigned long data)
{
struct at91mci_host *host;
@@ -148,6 +185,7 @@ static void at91_timeout_timer(unsigned long data)
host->request->cmd->error = -ETIMEDOUT;
}
+ at91_reset_host(host);
mmc_request_done(host->mmc, host->request);
}
}
@@ -512,6 +550,11 @@ static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command
mr |= AT91_MCI_PDCMODE;
at91_mci_write(host, AT91_MCI_MR, mr);
+ if (!cpu_is_at91rm9200())
+ at91_mci_write(host, AT91_MCI_BLKR,
+ AT91_MCI_BLKR_BCNT(blocks) |
+ AT91_MCI_BLKR_BLKLEN(block_length));
+
/*
* Disable the PDC controller
*/
@@ -584,6 +627,11 @@ static void at91_mci_process_next(struct at91mci_host *host)
at91_mci_send_command(host, host->request->stop);
} else {
del_timer(&host->timer);
+ /* the at91rm9200 mci controller hangs after some transfers,
+ * and the workaround is to reset it after each transfer.
+ */
+ if (cpu_is_at91rm9200())
+ at91_reset_host(host);
mmc_request_done(host->mmc, host->request);
}
}