Commit Graph

66 Commits

Author SHA1 Message Date
James Hogan 7456caae37 mmc: dw_mmc: fix race with request and removal
When a request is made, the card presence is checked and the request is
queued. These two parts must be atomic with respect to card removal, or
a card removal could be handled in between, and the new request wouldn't
get cancelled until another card was inserted. Therefore move the
spinlock protection from dw_mci_queue_request() up into dw_mci_request()
to cover the presence check.

Note that the test_bit() used for the presence check isn't atomic
itself, so should have been protected by a spinlock anyway.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-07-20 17:20:58 -04:00
James Hogan b40af3aa77 mmc: dw_mmc: clear TXDR/RXDR ints before enabling
DMA is only used for transactions exceeding a certain length, otherwise
PIO is used. The TXDR and RXDR interrupts are masked when in DMA mode
but still fire. When switching to PIO mode (e.g. to get SCR field when
an SD card is inserted) these interrupts are not cleared and so they
trigger the ISR as soon as they are unmasked. If the previous DMA did a
write, then the ISR will handle the TXDR interrupt even if the
transaction is a read, completing the transaction without modifying the
read buffer.

This is fixed primarily by clearing these two interrupts before
unmasking them when setting up PIO mode, and also by making the ISR more
robust by only handling TXDR/RXDR in the correct read/write direction.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-07-20 17:20:57 -04:00
Seungwon Jeon 6e83e10d92 mmc: dw_mmc: protect a sequence of request and request-done.
Response timeout (RTO), Response crc error (RCRC) and Response error (RE)
signals come with command done (CD) and can be raised preceding command
done (CD). That is these error interrupts and CD can be handled in
separate dw_mci_interrupt(). If mmc_request_done() is called because of
a response timeout before command done has occured, we might send the
next request before the CD of current request is finished. This can
bring about a broken sequence of request and request-done.

And Data error interrupt (DRTO, DCRC, SBE, EBE) and data transfer
over (DTO) have the same problem.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-07-20 17:20:53 -04:00
Seungwon Jeon 1d56c453b1 mmc: dw_mmc: set the card_width bit per card.
This patch sets the card_width bit of CTYPE for the corresponding card.

CTYPE[31] and CTYPE[16] correspond respectively to card[15] and card[0]
for 8-bit mode. And CTYPE[15] and CTYPE[0] correspond respectively to
card[15] and CTYPE[0] for 1-bit or 4-bit mode.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-07-20 17:20:53 -04:00
Joe Perches 28f65c11f2 treewide: Convert uses of struct resource to resource_size(ptr)
Several fixes as well where the +1 was missing.

Done via coccinelle scripts like:

@@
struct resource *ptr;
@@

- ptr->end - ptr->start + 1
+ resource_size(ptr)

and some grep and typing.

Mostly uncompiled, no cross-compilers.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-06-10 14:55:36 +02:00
Jaehoon Chung 1d6c4e0a00 mmc: dw_mmc: fixed wrong regulator_enable in suspend/resume
regulator_enable() was incorrectly placed in the suspend function
instead of the resume function.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-05-24 23:53:56 -04:00
Jaehoon Chung a5289a433d mmc: dw_mmc: set fixed burst in BMOD register
This patch uses the fixed burst bit when using an internal DMA controller.
I found increased performance with IDMAC when this bit is set.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-03-25 10:30:49 -04:00
Jaehoon Chung c07946a335 mmc: dw_mmc: support mmc power control with regulator
This patch adds support for power regulators.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-03-17 15:35:22 -04:00
Jaehoon Chung e61cf1184d mmc: dw_mmc: fix suspend/resume operation
This patch is related to re-init processing on suspend/resume.

When card is resuming, some register is reset.  If card is removable,
maybe controller should be rescan for card.  But if assume card is
non-removable, need to restore the old value at registers.

We store the value of FIFOTH at probe time and then restore it in
dw_mci_resume().

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-03-17 15:35:20 -04:00
Jaehoon Chung fc3d772054 mmc: dw_mmc: add quirks for unreliable card detect, and capabilities
This patch adds quirks and capabilities to platdata.

Some cards don't use the CDn pin; in that case, we assume the card's
inserted. Some boards need other capabilities. So, we add capabilities
in the board's platdata.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-03-17 15:35:18 -04:00
Chris Ball ba6a902d9d mmc: dw_mmc: Remove set-but-unused variable.
count is only ever used by assigning to old_len if count == 0, and
then old_len isn't ever used at all.  So, both are redundant.  Fixes:

drivers/mmc/host/dw_mmc.c: In function ‘dw_mci_read_data_pio’:
drivers/mmc/host/dw_mmc.c:1034:32: warning: variable ‘old_len’ set but
not used [-Wunused-but-set-variable]

Signed-off-by: Chris Ball <cjb@laptop.org>
Acked-by: Will Newton <will.newton@imgtec.com>
2011-03-17 15:35:06 -04:00
Jaehoon Chung 41babf753c mmc: dw_mmc: support DDR mode
This patch adds DDR mode support to dw_mmc.

If we set any bit in UHS_REG bit[16:31], the card of that slot is
supported for DDR mode.  For example, if UHS_REG[16] is set, card
number 0 is DDR mode.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-03-15 13:51:47 -04:00
Jaehoon Chung c9b2a06fb0 mmc: dw_mmc: support 8-bit buswidth
This patch adds support for 8-bit buswidth.
dw_mmc can use 8-bit buswidth and set to CTYPE_8BIT in card-type register.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-03-15 13:49:30 -04:00
Will Newton aadb9f4110 mmc: dw_mmc: Enable low-power mode for the card clock.
Setting this bit in the clock enable register will stop the clock
when the card is in the IDLE state.

Signed-off-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-03-15 13:48:53 -04:00
Will Newton dd6c4b9807 mmc: dw_mmc: Run card detect tasklet during slot initialisation.
We need to run the card detect tasklet at the end of slot initialisation
as it is possible that a card has been inserted prior to boot, so we don't
see an insertion interrupt and now the card is sitting there inserted but
with no power to it.

Signed-off-by: Neil Jones <neil.jones@imgtec.com>
Signed-off-by: Will Newton <will.newton@imgtec.com>
Reviewed-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-03-15 13:48:51 -04:00
Will Newton f95f3850f7 mmc: dw_mmc: Add Synopsys DesignWare mmc host driver.
This adds the mmc host driver for the Synopsys DesignWare mmc
host controller, found in a number of embedded SoC designs.

Signed-off-by: Will Newton <will.newton@imgtec.com>
Reviewed-by: Matt Fleming <matt@console-pimps.org>
Reviewed-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
2011-01-08 23:52:24 -05:00