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ARM: 5697/1: MMCI Break out clock divider setup

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This breaks out the clock divider set-up code from the
mmci_set_ios() code and surrounds the two register
writes with a host lock so we don't get collisions if
(in future code) two code paths want to change the
clock divider at the same time as can be the case if
we get something like pre/post- clock frequency change
notifications soonish.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij 2009-09-14 12:56:14 +01:00 committed by Russell King
parent bc581770cf
commit a6a6464a0e
1 changed files with 34 additions and 17 deletions
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51
drivers/mmc/host/mmci.c
View file

@ -38,6 +38,33 @@
static unsigned int fmax = 515633;
/*
* This must be called with host->lock held
*/
static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
{
u32 clk = 0;
if (desired) {
if (desired >= host->mclk) {
clk = MCI_CLK_BYPASS;
host->cclk = host->mclk;
} else {
clk = host->mclk / (2 * desired) - 1;
if (clk >= 256)
clk = 255;
host->cclk = host->mclk / (2 * (clk + 1));
}
if (host->hw_designer == 0x80)
clk |= MCI_FCEN; /* Bug fix in ST IP block */
clk |= MCI_CLK_ENABLE;
/* This hasn't proven to be worthwhile */
/* clk |= MCI_CLK_PWRSAVE; */
}
writel(clk, host->base + MMCICLOCK);
}
static void
mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
{
@ -419,22 +446,8 @@ static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmci_host *host = mmc_priv(mmc);
u32 clk = 0, pwr = 0;
if (ios->clock) {
if (ios->clock >= host->mclk) {
clk = MCI_CLK_BYPASS;
host->cclk = host->mclk;
} else {
clk = host->mclk / (2 * ios->clock) - 1;
if (clk >= 256)
clk = 255;
host->cclk = host->mclk / (2 * (clk + 1));
}
if (host->hw_designer == AMBA_VENDOR_ST)
clk |= MCI_FCEN; /* Bug fix in ST IP block */
clk |= MCI_CLK_ENABLE;
}
u32 pwr = 0;
unsigned long flags;
if (host->plat->translate_vdd)
pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
@ -465,12 +478,16 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
}
}
writel(clk, host->base + MMCICLOCK);
spin_lock_irqsave(&host->lock, flags);
mmci_set_clkreg(host, ios->clock);
if (host->pwr != pwr) {
host->pwr = pwr;
writel(pwr, host->base + MMCIPOWER);
}
spin_unlock_irqrestore(&host->lock, flags);
}
static int mmci_get_ro(struct mmc_host *mmc)