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mmci: Add support for ST Micro derivate

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This patch adds support for the ST Microelectronics version of
the PL180 PrimeCell. They use designer ID 0x80 and have a few
alterations/bugfixes related to open drain and HW flow control.
They also add some SDIO registers, I am unsure if these are
in ST HW only or if this is things also added in later ARM
revisions, but they are included in the mmci.h file for
completeness.

Signed-off-by: Linus Walleij <linus.walleij@ericsson.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Linus Walleij
2009-01-04 15:18:54 +01:00
committed by Pierre Ossman
parent d96be879ff
commit cc30d60e4c
2 changed files with 61 additions and 4 deletions
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37
drivers/mmc/host/mmci.c
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@@ -430,6 +430,8 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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;
}
@@ -440,15 +442,27 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
case MMC_POWER_OFF:
break;
case MMC_POWER_UP:
pwr |= MCI_PWR_UP;
break;
/* The ST version does not have this, fall through to POWER_ON */
if (host->hw_designer != 0x80) {
pwr |= MCI_PWR_UP;
break;
}
case MMC_POWER_ON:
pwr |= MCI_PWR_ON;
break;
}
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
pwr |= MCI_ROD;
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
if (host->hw_designer != 0x80)
pwr |= MCI_ROD;
else {
/*
* The ST Micro variant use the ROD bit for something
* else and only has OD (Open Drain).
*/
pwr |= MCI_OD;
}
}
writel(clk, host->base + MMCICLOCK);
@@ -500,6 +514,12 @@ static int mmci_probe(struct amba_device *dev, void *id)
}
host = mmc_priv(mmc);
/* Bits 12 thru 19 is the designer */
host->hw_designer = (dev->periphid >> 12) & 0xff;
/* Bits 20 thru 23 is the revison */
host->hw_revision = (dev->periphid >> 20) & 0xf;
DBG(host, "designer ID = 0x%02x\n", host->hw_designer);
DBG(host, "revision = 0x%01x\n", host->hw_revision);
host->clk = clk_get(&dev->dev, NULL);
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
@@ -693,6 +713,15 @@ static struct amba_id mmci_ids[] = {
.id = 0x00041181,
.mask = 0x000fffff,
},
/* ST Micro variants */
{
.id = 0x00180180,
.mask = 0x00ffffff,
},
{
.id = 0x00280180,
.mask = 0x00ffffff,
},
{ 0, 0 },
};