[PATCH] OMAP: HSMMC: Fix 1.8V MMC2 host on OMAP2430/3430

Seth Forshee
2008-04-01T01:36:54Z

OMAP2430/3430 contain an 1.8V-only MMC2 host that is not properly
supported by the current driver. This patch contains changes to
correctly set up this host.

Signed-off-by: Seth Forshee <seth.forshee@gmail.com>
Acked-by: Francisco Alecrim <francisco.alecrim@indt.org.br>
---
drivers/mmc/host/omap_hsmmc.c | 32 ++++++++++++++++++++++++++------
1 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 248257f..d5d82a8 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -388,8 +388,12 @@ static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
* If a MMC dual voltage card is detected, the set_ios fn calls
* this fn with VDD bit set for 1.8V. Upon card removal from the
* slot, mmc_omap_detect fn sets the VDD back to 3V.
+ *
+ * Only MMC1 supports 3.0V. MMC2 will not function if SDVS30 is
+ * set in HCTL.
*/
- if (((1 << vdd) == MMC_VDD_32_33) || ((1 << vdd) == MMC_VDD_33_34))
+ if (host->id == OMAP_MMC1_DEVID && (((1 << vdd) == MMC_VDD_32_33) ||
+ ((1 << vdd) == MMC_VDD_33_34)))
reg_val |= SDVS30;
if ((1 << vdd) == MMC_VDD_165_195)
reg_val |= SDVS18;
@@ -517,10 +521,16 @@ mmc_omap_start_dma_transfer(struct mmc_omap_host *host, struct mmc_request *req)

if (!(data->flags & MMC_DATA_WRITE)) {
host->dma_dir = DMA_FROM_DEVICE;
- sync_dev = OMAP24XX_DMA_MMC1_RX;
+ if (host->id == OMAP_MMC1_DEVID)
+ sync_dev = OMAP24XX_DMA_MMC1_RX;
+ else
+ sync_dev = OMAP24XX_DMA_MMC2_RX;
} else {
host->dma_dir = DMA_TO_DEVICE;
- sync_dev = OMAP24XX_DMA_MMC1_TX;
+ if (host->id == OMAP_MMC1_DEVID)
+ sync_dev = OMAP24XX_DMA_MMC1_TX;
+ else
+ sync_dev = OMAP24XX_DMA_MMC2_TX;
}

ret = omap_request_dma(sync_dev, "MMC/SD", mmc_omap_dma_cb,
@@ -692,6 +702,7 @@ static int __init omap_mmc_probe(struct platform_device *pdev)
struct mmc_omap_host *host = NULL;
struct resource *res;
int ret = 0, irq;
+ u32 hctl, capa;

if (pdata == NULL) {
dev_err(&pdev->dev, "Platform Data is missing\n");
@@ -778,11 +789,20 @@ static int __init omap_mmc_probe(struct platform_device *pdev)
if (pdata->conf.wire4)
mmc->caps |= MMC_CAP_4_BIT_DATA;

+ /* Only MMC1 supports 3.0V */
+ if (host->id == OMAP_MMC1_DEVID) {
+ hctl = SDVS30;
+ capa = VS30 | VS18;
+ } else {
+ hctl = SDVS18;
+ capa = VS18;
+ }
+
OMAP_HSMMC_WRITE(host->base, HCTL,
- OMAP_HSMMC_READ(host->base, HCTL) | SDVS30);
+ OMAP_HSMMC_READ(host->base, HCTL) | hctl);

- OMAP_HSMMC_WRITE(host->base, CAPA, OMAP_HSMMC_READ(host->base,
- CAPA) | VS30 | VS18);
+ OMAP_HSMMC_WRITE(host->base, CAPA,
+ OMAP_HSMMC_READ(host->base, CAPA) | capa);

/* Set the controller to AUTO IDLE mode */
OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
--
1.5.2