mmci: Add support for ST Micro derivate

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>

1 files changed, 33 insertions, 4 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 1bcbdd6763ac..2909bbc8ad00 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -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 },
 };