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mmc: dw_mmc-pltfm: add Rockchip variant 

Cortex-A9 SoCs from Rockchip use a slightly modified variant of dw_mmc
controllers that seems to require the SDMMC_CMD_USE_HOLD_REG bit to
always be set.

There also seem to be no other modifications (additional register etc)
present, so to keep the footprint low, add this small variant to the
pltfm driver.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Seungwon Jeon <tgih.jun@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Heiko Stübner 2013-06-27 11:55:35 -04:00 committed by Chris Ball
parent b177a530bb
commit c73e41c898
2 changed files with 43 additions and 1 deletions
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23
Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt Normal file
View File

@ -0,0 +1,23 @@
* Rockchip specific extensions to the Synopsis Designware Mobile
Storage Host Controller
The Synopsis designware mobile storage host controller is used to interface
a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
differences between the core Synopsis dw mshc controller properties described
by synopsis-dw-mshc.txt and the properties used by the Rockchip specific
extensions to the Synopsis Designware Mobile Storage Host Controller.
Required Properties:
* compatible: should be
- "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following
Example:
rkdwmmc0@12200000 {
compatible = "rockchip,rk2928-dw-mshc";
reg = <0x12200000 0x1000>;
interrupts = <0 75 0>;
#address-cells = <1>;
#size-cells = <0>;
};

21
drivers/mmc/host/dw_mmc-pltfm.c
View File

@ -24,6 +24,15 @@
#include "dw_mmc.h"
static void dw_mci_rockchip_prepare_command(struct dw_mci *host, u32 *cmdr)
{
*cmdr |= SDMMC_CMD_USE_HOLD_REG;
}
static const struct dw_mci_drv_data rockchip_drv_data = {
.prepare_command = dw_mci_rockchip_prepare_command,
};
int dw_mci_pltfm_register(struct platform_device *pdev,
const struct dw_mci_drv_data *drv_data)
{
@ -87,13 +96,23 @@ EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
static const struct of_device_id dw_mci_pltfm_match[] = {
{ .compatible = "snps,dw-mshc", },
{ .compatible = "rockchip,rk2928-dw-mshc",
.data = &rockchip_drv_data },
{},
};
MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
static int dw_mci_pltfm_probe(struct platform_device *pdev)
{
return dw_mci_pltfm_register(pdev, NULL);
const struct dw_mci_drv_data *drv_data = NULL;
const struct of_device_id *match;
if (pdev->dev.of_node) {
match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
drv_data = match->data;
}
return dw_mci_pltfm_register(pdev, drv_data);
}
int dw_mci_pltfm_remove(struct platform_device *pdev)