diff options
| author | Rabin Vincent <rabin.vincent@stericsson.com> | 2010-08-09 12:57:30 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-08-26 19:54:29 +0100 |
| commit | 8301bb68c6bb9836889641a47443aeb97b763f6c (patch) | |
| tree | 4d65282eb5ad2cd6ec793483bc82e5e7ad5d9357 /drivers/mmc/host/mmci.c | |
| parent | 2971944582ff43b7dedbb460777052243ac9915a (diff) | |
ARM: 6310/1: mmci: support different FIFO sizes
The Ux500 variant has a 32-word FIFO (TXFIFOEMPTY is asserted when it
has 2 left) and TXFIFOHALFEMPTY is repurposed as TXFIFOBURSTWRITEABLE,
with a burst being defined as 8-words. Likewise for RX.
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>
Diffstat (limited to 'drivers/mmc/host/mmci.c')
| -rw-r--r-- | drivers/mmc/host/mmci.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 9a9aeac50a6..1932e9cc8f5 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -41,23 +41,35 @@ static unsigned int fmax = 515633; * @clkreg: default value for MCICLOCK register * @clkreg_enable: enable value for MMCICLOCK register * @datalength_bits: number of bits in the MMCIDATALENGTH register + * @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY + * is asserted (likewise for RX) + * @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY + * is asserted (likewise for RX) */ struct variant_data { unsigned int clkreg; unsigned int clkreg_enable; unsigned int datalength_bits; + unsigned int fifosize; + unsigned int fifohalfsize; }; static struct variant_data variant_arm = { + .fifosize = 16 * 4, + .fifohalfsize = 8 * 4, .datalength_bits = 16, }; static struct variant_data variant_u300 = { + .fifosize = 16 * 4, + .fifohalfsize = 8 * 4, .clkreg_enable = 1 << 13, /* HWFCEN */ .datalength_bits = 16, }; static struct variant_data variant_ux500 = { + .fifosize = 30 * 4, + .fifohalfsize = 8 * 4, .clkreg = MCI_CLK_ENABLE, .clkreg_enable = 1 << 14, /* HWFCEN */ .datalength_bits = 24, @@ -138,6 +150,7 @@ static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data) static void mmci_start_data(struct mmci_host *host, struct mmc_data *data) { + struct variant_data *variant = host->variant; unsigned int datactrl, timeout, irqmask; unsigned long long clks; void __iomem *base; @@ -173,7 +186,7 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data) * If we have less than a FIFOSIZE of bytes to transfer, * trigger a PIO interrupt as soon as any data is available. */ - if (host->size < MCI_FIFOSIZE) + if (host->size < variant->fifosize) irqmask |= MCI_RXDATAAVLBLMASK; } else { /* @@ -332,13 +345,15 @@ static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int rema static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status) { + struct variant_data *variant = host->variant; void __iomem *base = host->base; char *ptr = buffer; do { unsigned int count, maxcnt; - maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE; + maxcnt = status & MCI_TXFIFOEMPTY ? + variant->fifosize : variant->fifohalfsize; count = min(remain, maxcnt); writesl(base + MMCIFIFO, ptr, count >> 2); @@ -362,6 +377,7 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id) { struct mmci_host *host = dev_id; struct sg_mapping_iter *sg_miter = &host->sg_miter; + struct variant_data *variant = host->variant; void __iomem *base = host->base; unsigned long flags; u32 status; @@ -420,7 +436,7 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id) * If we're nearing the end of the read, switch to * "any data available" mode. */ - if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE) + if (status & MCI_RXACTIVE && host->size < variant->fifosize) writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1); /* |