| Message ID | 20221019170657.68014-5-dinguyen@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm: socfpga: use clk-phase-sd-hs | expand |
On 19/10/2022 13:06, Dinh Nguyen wrote: > The clock-phase settings for the SDMMC controller in the SoCFPGA > platforms reside in a register in the System Manager. Add a method > to access that register through the syscon interface. > > Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> > --- > v5: change error handling from of_property_read_variable_u32_array() > support arm32 by reading the reg_shift > v4: no change > v3: add space before &socfpga_drv_data > v2: simplify clk-phase calculations > --- > drivers/mmc/host/dw_mmc-pltfm.c | 43 ++++++++++++++++++++++++++++++++- > 1 file changed, 42 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c > index 9901208be797..74421d13f466 100644 > --- a/drivers/mmc/host/dw_mmc-pltfm.c > +++ b/drivers/mmc/host/dw_mmc-pltfm.c > @@ -17,10 +17,16 @@ > #include <linux/mmc/host.h> > #include <linux/mmc/mmc.h> > #include <linux/of.h> > +#include <linux/mfd/altera-sysmgr.h> > +#include <linux/regmap.h> > > #include "dw_mmc.h" > #include "dw_mmc-pltfm.h" > > +#define SOCFPGA_DW_MMC_CLK_PHASE_STEP 45 > +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel, reg_shift) \ > + ((((smplsel) & 0x7) << reg_shift) | (((drvsel) & 0x7) << 0)) > + > int dw_mci_pltfm_register(struct platform_device *pdev, > const struct dw_mci_drv_data *drv_data) > { > @@ -62,9 +68,44 @@ const struct dev_pm_ops dw_mci_pltfm_pmops = { > }; > EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops); > > +static int dw_mci_socfpga_priv_init(struct dw_mci *host) > +{ > + struct device_node *np = host->dev->of_node; > + struct regmap *sys_mgr_base_addr; > + u32 clk_phase[2] = {0}, reg_offset, reg_shift; > + int i, rc, hs_timing; > + > + rc = of_property_read_variable_u32_array(np, "clk-phase-sd-hs", &clk_phase[0], 2, 0); > + if (rc < 0) { > + dev_err(host->dev, "clk-phase-sd-hs not found!\n"); > + return rc; > + } > + > + sys_mgr_base_addr = altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon"); > + if (IS_ERR(sys_mgr_base_addr)) { > + dev_err(host->dev, "failed to find altr,sys-mgr regmap!\n"); > + return -ENODEV; Isn't this now an ABI break? I have an impression we talked about this... Best regards, Krzysztof
On 10/21/22 08:32, Krzysztof Kozlowski wrote: > On 19/10/2022 13:06, Dinh Nguyen wrote: >> The clock-phase settings for the SDMMC controller in the SoCFPGA >> platforms reside in a register in the System Manager. Add a method >> to access that register through the syscon interface. >> >> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> >> --- >> v5: change error handling from of_property_read_variable_u32_array() >> support arm32 by reading the reg_shift >> v4: no change >> v3: add space before &socfpga_drv_data >> v2: simplify clk-phase calculations >> --- >> drivers/mmc/host/dw_mmc-pltfm.c | 43 ++++++++++++++++++++++++++++++++- >> 1 file changed, 42 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c >> index 9901208be797..74421d13f466 100644 >> --- a/drivers/mmc/host/dw_mmc-pltfm.c >> +++ b/drivers/mmc/host/dw_mmc-pltfm.c >> @@ -17,10 +17,16 @@ >> #include <linux/mmc/host.h> >> #include <linux/mmc/mmc.h> >> #include <linux/of.h> >> +#include <linux/mfd/altera-sysmgr.h> >> +#include <linux/regmap.h> >> >> #include "dw_mmc.h" >> #include "dw_mmc-pltfm.h" >> >> +#define SOCFPGA_DW_MMC_CLK_PHASE_STEP 45 >> +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel, reg_shift) \ >> + ((((smplsel) & 0x7) << reg_shift) | (((drvsel) & 0x7) << 0)) >> + >> int dw_mci_pltfm_register(struct platform_device *pdev, >> const struct dw_mci_drv_data *drv_data) >> { >> @@ -62,9 +68,44 @@ const struct dev_pm_ops dw_mci_pltfm_pmops = { >> }; >> EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops); >> >> +static int dw_mci_socfpga_priv_init(struct dw_mci *host) >> +{ >> + struct device_node *np = host->dev->of_node; >> + struct regmap *sys_mgr_base_addr; >> + u32 clk_phase[2] = {0}, reg_offset, reg_shift; >> + int i, rc, hs_timing; >> + >> + rc = of_property_read_variable_u32_array(np, "clk-phase-sd-hs", &clk_phase[0], 2, 0); >> + if (rc < 0) { >> + dev_err(host->dev, "clk-phase-sd-hs not found!\n"); >> + return rc; >> + } >> + >> + sys_mgr_base_addr = altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon"); >> + if (IS_ERR(sys_mgr_base_addr)) { >> + dev_err(host->dev, "failed to find altr,sys-mgr regmap!\n"); >> + return -ENODEV; > > Isn't this now an ABI break? I have an impression we talked about this... > My fault, I'll make this optional. Dinh
diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c index 9901208be797..74421d13f466 100644 --- a/drivers/mmc/host/dw_mmc-pltfm.c +++ b/drivers/mmc/host/dw_mmc-pltfm.c @@ -17,10 +17,16 @@ #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/of.h> +#include <linux/mfd/altera-sysmgr.h> +#include <linux/regmap.h> #include "dw_mmc.h" #include "dw_mmc-pltfm.h" +#define SOCFPGA_DW_MMC_CLK_PHASE_STEP 45 +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel, reg_shift) \ + ((((smplsel) & 0x7) << reg_shift) | (((drvsel) & 0x7) << 0)) + int dw_mci_pltfm_register(struct platform_device *pdev, const struct dw_mci_drv_data *drv_data) { @@ -62,9 +68,44 @@ const struct dev_pm_ops dw_mci_pltfm_pmops = { }; EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops); +static int dw_mci_socfpga_priv_init(struct dw_mci *host) +{ + struct device_node *np = host->dev->of_node; + struct regmap *sys_mgr_base_addr; + u32 clk_phase[2] = {0}, reg_offset, reg_shift; + int i, rc, hs_timing; + + rc = of_property_read_variable_u32_array(np, "clk-phase-sd-hs", &clk_phase[0], 2, 0); + if (rc < 0) { + dev_err(host->dev, "clk-phase-sd-hs not found!\n"); + return rc; + } + + sys_mgr_base_addr = altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon"); + if (IS_ERR(sys_mgr_base_addr)) { + dev_err(host->dev, "failed to find altr,sys-mgr regmap!\n"); + return -ENODEV; + } + + of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, ®_offset); + of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, ®_shift); + + for (i = 0; i < ARRAY_SIZE(clk_phase); i++) + clk_phase[i] /= SOCFPGA_DW_MMC_CLK_PHASE_STEP; + + hs_timing = SYSMGR_SDMMC_CTRL_SET(clk_phase[0], clk_phase[1], reg_shift); + regmap_write(sys_mgr_base_addr, reg_offset, hs_timing); + + return 0; +} + +static const struct dw_mci_drv_data socfpga_drv_data = { + .init = dw_mci_socfpga_priv_init, +}; + static const struct of_device_id dw_mci_pltfm_match[] = { { .compatible = "snps,dw-mshc", }, - { .compatible = "altr,socfpga-dw-mshc", }, + { .compatible = "altr,socfpga-dw-mshc", .data = &socfpga_drv_data, }, { .compatible = "img,pistachio-dw-mshc", }, {}, };
The clock-phase settings for the SDMMC controller in the SoCFPGA platforms reside in a register in the System Manager. Add a method to access that register through the syscon interface. Signed-off-by: Dinh Nguyen <dinguyen@kernel.org> --- v5: change error handling from of_property_read_variable_u32_array() support arm32 by reading the reg_shift v4: no change v3: add space before &socfpga_drv_data v2: simplify clk-phase calculations --- drivers/mmc/host/dw_mmc-pltfm.c | 43 ++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-)