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| author | Rabin Vincent <rabin.vincent@stericsson.com> | 2010-07-21 12:55:59 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-29 15:40:56 +0100 |
| commit | 08458ef6eede6cf7d5a33c3a7c8bcdc3943012c2 (patch) | |
| tree | c812872f484531e6d7a77ea14e22b7805f5856a4 | |
| parent | 4380c14fd77338bac9d1da4dc5dd9f6eb4966c82 (diff) | |
| download | blackbird-op-linux-08458ef6eede6cf7d5a33c3a7c8bcdc3943012c2.tar.gz blackbird-op-linux-08458ef6eede6cf7d5a33c3a7c8bcdc3943012c2.zip | |
ARM: 6246/1: mmci: support larger MMCIDATALENGTH register
The Ux500 variant has a 24-bit MMCIDATALENGTH register, as opposed to
the 16-bit one on the ARM version.
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | drivers/mmc/host/mmci.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 379af904bf6c..7edae83603dd 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -40,22 +40,27 @@ static unsigned int fmax = 515633; * struct variant_data - MMCI variant-specific quirks * @clkreg: default value for MCICLOCK register * @clkreg_enable: enable value for MMCICLOCK register + * @datalength_bits: number of bits in the MMCIDATALENGTH register */ struct variant_data { unsigned int clkreg; unsigned int clkreg_enable; + unsigned int datalength_bits; }; static struct variant_data variant_arm = { + .datalength_bits = 16, }; static struct variant_data variant_u300 = { .clkreg_enable = 1 << 13, /* HWFCEN */ + .datalength_bits = 16, }; static struct variant_data variant_ux500 = { .clkreg = MCI_CLK_ENABLE, .clkreg_enable = 1 << 14, /* HWFCEN */ + .datalength_bits = 24, }; /* * This must be called with host->lock held @@ -699,10 +704,11 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id) mmc->max_phys_segs = NR_SG; /* - * Since we only have a 16-bit data length register, we must - * ensure that we don't exceed 2^16-1 bytes in a single request. + * Since only a certain number of bits are valid in the data length + * register, we must ensure that we don't exceed 2^num-1 bytes in a + * single request. */ - mmc->max_req_size = 65535; + mmc->max_req_size = (1 << variant->datalength_bits) - 1; /* * Set the maximum segment size. Since we aren't doing DMA |
