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ARM: 7725/1: mmc: mmci: Cache MMCIDATACTRL register

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Add a cache variable in the host struct that reflects the current data in
the MMCIDATACTRL register. This patch will not introduce any functional
change but instead provide an easy option to keep specific bits in the
register between each data transfer.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ulf Hansson 2013-05-15 20:48:23 +01:00 committed by Russell King
parent 0f3ed7f75c
commit 9cc639a20f
2 changed files with 15 additions and 3 deletions
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17
drivers/mmc/host/mmci.c
View File

@ -188,6 +188,17 @@ static void mmci_write_pwrreg(struct mmci_host *host, u32 pwr)
}
}
/*
* This must be called with host->lock held
*/
static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl)
{
if (host->datactrl_reg != datactrl) {
host->datactrl_reg = datactrl;
writel(datactrl, host->base + MMCIDATACTRL);
}
}
/*
* This must be called with host->lock held
*/
@ -281,7 +292,7 @@ static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
static void mmci_stop_data(struct mmci_host *host)
{
writel(0, host->base + MMCIDATACTRL);
mmci_write_datactrlreg(host, 0);
mmci_set_mask1(host, 0);
host->data = NULL;
}
@ -559,7 +570,7 @@ static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
datactrl |= MCI_DPSM_DMAENABLE;
/* Trigger the DMA transfer */
writel(datactrl, host->base + MMCIDATACTRL);
mmci_write_datactrlreg(host, datactrl);
/*
* Let the MMCI say when the data is ended and it's time
@ -757,7 +768,7 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
irqmask = MCI_TXFIFOHALFEMPTYMASK;
}
writel(datactrl, base + MMCIDATACTRL);
mmci_write_datactrlreg(host, datactrl);
writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
mmci_set_mask1(host, irqmask);
}

1
drivers/mmc/host/mmci.h
View File

@ -183,6 +183,7 @@ struct mmci_host {
unsigned int cclk;
u32 pwr_reg;
u32 clk_reg;
u32 datactrl_reg;
bool vqmmc_enabled;
struct mmci_platform_data *plat;
struct variant_data *variant;