On Mon, Apr 10, 2017 at 11:33 PM, Vignesh R vigneshr@ti.com wrote:
On Tuesday 11 April 2017 03:42 AM, Adam Ford wrote:
I am working on porting an OMAP3630 board to support device tree, and I attempted to change enable DM_MMC. Unfortunately, that broke MMC.
I discovered that the base addresses were originally updated to reflect a change in the base address when using the device tree for some devices.
This was done in 11e1582506c6 ("omap_hsmmc: update struct hsmmc to accomodate base address from DT")
Unfortunately, this breaks the base address on an OMAP3630 (and I assume omap34xx) which currently doesn't have OF support yet.
Without this patch, the when driver attemps to write to mmc_base->sysconfig at 4809c110 is used instead of mmc_base->sysconfig at 4809c010. This makes any attempt to use the mmc fail. With this patch, I am able to read/write to the MMC device with DM_MMC enabled with OF support.
If there is a better solution, I am open to ideas. I verified this against the OMAP3530 TRM and OMAP3630 TRM. Since AM3359 TRM has the same value, it might be helpful for other boards, but I don't have them to test. If there is a better solution, I am perfectly open for suggestions.
How about handling this in the same way as handled by Linux kernel omap_hsmmc driver?
I will concede that I originally misread the AM33xx TRM. According to it Table 18-14, the SYSSTATUS is offset 0x114, and the OMAP3 datasheet shows 0x14 consistent with the table in U-boot without the x100 byte offset.
I believe my initial suggestion should work by checking CONFIG_OMAP34XX. If present, it will not add the offset.
Sorry for the noise, I'll clean up the patch and resubmit it.
adam
If this gets reviewed and approved, I can push the OMAP3630 (and OMAP3) device trees which might let more boards move to DM and OF support.
Signed-off-by: Adam Ford aford173@gmail.com
diff --git a/arch/arm/include/asm/omap_mmc.h b/arch/arm/include/asm/omap_mmc.h index f2bf645..fd9b741 100644 --- a/arch/arm/include/asm/omap_mmc.h +++ b/arch/arm/include/asm/omap_mmc.h @@ -26,7 +26,7 @@ #define OMAP_MMC_H_
struct hsmmc { -#ifdef CONFIG_DM_MMC +#if defined(CONFIG_DM_MMC) && !defined(OMAP34XX) unsigned char res0[0x100]; #endif unsigned char res1[0x10];
-- Regards Vignesh