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mmc: sdhci-msm: Add support for vendor capabilities registers

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Some versions of this controller do not advertise their 3.0v and
8bit bus-width support capabilities. It is required to explicitly
set these capabilities for the specific controller versions.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Georgi Djakov 2015-03-23 18:47:29 +02:00 committed by Ulf Hansson
parent 07bf2b54cd
commit 3a3ad3e9d5
1 changed files with 28 additions and 1 deletions
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29
drivers/mmc/host/sdhci-msm.c
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@ -22,6 +22,11 @@
#include "sdhci-pltfm.h"
#define CORE_MCI_VERSION 0x50
#define CORE_VERSION_MAJOR_SHIFT 28
#define CORE_VERSION_MAJOR_MASK (0xf << CORE_VERSION_MAJOR_SHIFT)
#define CORE_VERSION_MINOR_MASK 0xff
#define CORE_HC_MODE 0x78
#define HC_MODE_EN 0x1
#define CORE_POWER 0x0
@ -41,6 +46,8 @@
#define CORE_VENDOR_SPEC 0x10c
#define CORE_CLK_PWRSAVE BIT(1)
#define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c
#define CDR_SELEXT_SHIFT 20
#define CDR_SELEXT_MASK (0xf << CDR_SELEXT_SHIFT)
#define CMUX_SHIFT_PHASE_SHIFT 24
@ -426,7 +433,9 @@ static int sdhci_msm_probe(struct platform_device *pdev)
struct sdhci_msm_host *msm_host;
struct resource *core_memres;
int ret;
u16 host_version;
u16 host_version, core_minor;
u32 core_version, caps;
u8 core_major;
msm_host = devm_kzalloc(&pdev->dev, sizeof(*msm_host), GFP_KERNEL);
if (!msm_host)
@ -516,6 +525,24 @@ static int sdhci_msm_probe(struct platform_device *pdev)
host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >>
SDHCI_VENDOR_VER_SHIFT));
core_version = readl_relaxed(msm_host->core_mem + CORE_MCI_VERSION);
core_major = (core_version & CORE_VERSION_MAJOR_MASK) >>
CORE_VERSION_MAJOR_SHIFT;
core_minor = core_version & CORE_VERSION_MINOR_MASK;
dev_dbg(&pdev->dev, "MCI Version: 0x%08x, major: 0x%04x, minor: 0x%02x\n",
core_version, core_major, core_minor);
/*
* Support for some capabilities is not advertised by newer
* controller versions and must be explicitly enabled.
*/
if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
caps = readl_relaxed(host->ioaddr + SDHCI_CAPABILITIES);
caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT;
writel_relaxed(caps, host->ioaddr +
CORE_VENDOR_SPEC_CAPABILITIES0);
}
ret = sdhci_add_host(host);
if (ret)
goto clk_disable;