Acked-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Best Regards,
Jaehoon Chung
On 07/31/2014 03:01 PM, Addy Ke wrote:
> This patch focuses on clock setting for RK3288 mmc controller.
>
> In RK3288 mmc controller, CLKDIV register can only be set 0 or 1,
> and if DDR 8bit mode, CLKDIV register must be set 1.
>
> Reported-by Doug Anderson <dianders@xxxxxxxxxxxx>
> Suggested-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
> Suggested-by: Doug Anderson <dianders@xxxxxxxxxxxx>
> Signed-off-by: Addy Ke <addy.ke@xxxxxxxxxxxxxx>
> ---
> changes since v1:
> - dw_mci_rk3288_setup_clock: do not call clk_get_rate(), just use the
> host->bus_hz which is already called by dw_mmc.c, suggested by Jaehoon Chung
>
> changes since v2:
> - merge from ChromiumOS tree, fix up clock settting bug,
> which cause DDR50 mode for emmc not to work, reported by Doug Anderson
> - remove MMC_TIMING_UHS_DDR50 condition, because on RK3288 only emmc can work
> in 8bit mode, suggested by Doug Anderson
>
> .../devicetree/bindings/mmc/rockchip-dw-mshc.txt | 6 ++-
> drivers/mmc/host/dw_mmc-pltfm.c | 56 +++++++++++++++++++++-
> 2 files changed, 58 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
> index c559f3f..c327c2d 100644
> --- a/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
> +++ b/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
> @@ -10,12 +10,14 @@ extensions to the Synopsys Designware Mobile Storage Host Controller.
> Required Properties:
>
> * compatible: should be
> - - "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following
> + - "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following,
> + before RK3288
> + - "rockchip,rk3288-dw-mshc": for Rockchip RK3288
>
> Example:
>
> rkdwmmc0@12200000 {
> - compatible = "rockchip,rk2928-dw-mshc";
> + compatible = "rockchip,rk3288-dw-mshc";
> reg = <0x12200000 0x1000>;
> interrupts = <0 75 0>;
> #address-cells = <1>;
> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
> index d4a47a9..b547f7a 100644
> --- a/drivers/mmc/host/dw_mmc-pltfm.c
> +++ b/drivers/mmc/host/dw_mmc-pltfm.c
> @@ -21,17 +21,67 @@
> #include <linux/mmc/mmc.h>
> #include <linux/mmc/dw_mmc.h>
> #include <linux/of.h>
> +#include <linux/clk.h>
>
> #include "dw_mmc.h"
> #include "dw_mmc-pltfm.h"
>
> +#define RK3288_CLKGEN_DIV 2
> +
> static void dw_mci_pltfm_prepare_command(struct dw_mci *host, u32 *cmdr)
> {
> *cmdr |= SDMMC_CMD_USE_HOLD_REG;
> }
>
> -static const struct dw_mci_drv_data rockchip_drv_data = {
> +static int dw_mci_rk3288_setup_clock(struct dw_mci *host)
> +{
> + host->bus_hz /= RK3288_CLKGEN_DIV;
> +
> + return 0;
> +}
> +
> +static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> +{
> + int ret;
> + unsigned int cclkin;
> + u32 bus_hz;
> +
> + /*
> + * cclkin: source clock of mmc controller.
> + * bus_hz: card interface clock generated by CLKGEN.
> + * bus_hz = cclkin / RK3288_CLKGEN_DIV;
> + * ios->clock = (div == 0) ? bus_hz : (bus_hz / (2 * div))
> + *
> + * Note: div can only be 0 or 1
> + * if DDR50 8bit mode(only emmc work in 8bit mode),
> + * div must be set 1
> + */
> + if ((ios->bus_width == MMC_BUS_WIDTH_8) &&
> + (ios->timing == MMC_TIMING_MMC_DDR52))
> + cclkin = 2 * ios->clock * RK3288_CLKGEN_DIV;
> + else
> + cclkin = ios->clock * RK3288_CLKGEN_DIV;
> +
> + ret = clk_set_rate(host->ciu_clk, cclkin);
> + if (ret)
> + dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
> +
> + bus_hz = clk_get_rate(host->ciu_clk) / RK3288_CLKGEN_DIV;
> + if (bus_hz != host->bus_hz) {
> + host->bus_hz = bus_hz;
> + /* force dw_mci_setup_bus() */
> + host->current_speed = 0;
> + }
> +}
> +
> +static const struct dw_mci_drv_data rk2928_drv_data = {
> + .prepare_command = dw_mci_pltfm_prepare_command,
> +};
> +
> +static const struct dw_mci_drv_data rk3288_drv_data = {
> .prepare_command = dw_mci_pltfm_prepare_command,
> + .set_ios = dw_mci_rk3288_set_ios,
> + .setup_clock = dw_mci_rk3288_setup_clock,
> };
>
> static const struct dw_mci_drv_data socfpga_drv_data = {
> @@ -95,7 +145,9 @@ 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 },
> + .data = &rk2928_drv_data },
> + { .compatible = "rockchip,rk3288-dw-mshc",
> + .data = &rk3288_drv_data },
> { .compatible = "altr,socfpga-dw-mshc",
> .data = &socfpga_drv_data },
> {},
>
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