| Message ID | 20230208234313.23863-7-semen.protsenko@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | clk: samsung: Add PM support for ARM64 Exynos chips | expand |
On Wed, 8 Feb 2023 at 17:43, Sam Protsenko <semen.protsenko@linaro.org> wrote: > > Exynos5433 clock driver implements PM support internally, which might be > also useful for other Exynos clock drivers. Extract all PM related code > from clk-exynos5433 to common ARM64 functions. > > Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> > Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> > --- > Changes in v2: > - Rebased on top of latest soc/for-next tree > - Included linux/slab.h for kfree (found by kernel test robot) > > drivers/clk/samsung/clk-exynos-arm64.c | 171 ++++++++++++++++++++++++- > drivers/clk/samsung/clk-exynos-arm64.h | 3 + > drivers/clk/samsung/clk-exynos5433.c | 157 +---------------------- > 3 files changed, 175 insertions(+), 156 deletions(-) > > diff --git a/drivers/clk/samsung/clk-exynos-arm64.c b/drivers/clk/samsung/clk-exynos-arm64.c > index 2aa3f0a5644e..7ad7fd353dda 100644 > --- a/drivers/clk/samsung/clk-exynos-arm64.c > +++ b/drivers/clk/samsung/clk-exynos-arm64.c > @@ -10,6 +10,9 @@ > */ Hi Marek, It just occurred to me that as I'm pulling your code from clk-exynos5433.c here, I should've probably added you to this file's author list in the header comment. Does that sound right to you? If so, I can re-send v3 with fixes. Also, could you please review this series, if possible? I'm working right now on PM_DOMAINS support for Exynos850, so along with this series that would bring the initial PM support for ARM64 Exynos chips. Thanks! > #include <linux/clk.h> > #include <linux/of_address.h> > +#include <linux/of_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/slab.h> > > #include "clk-exynos-arm64.h" > > @@ -21,6 +24,19 @@ > #define GATE_OFF_START 0x2000 > #define GATE_OFF_END 0x2fff > > +struct exynos_arm64_cmu_data { > + struct samsung_clk_reg_dump *clk_save; > + unsigned int nr_clk_save; > + const struct samsung_clk_reg_dump *clk_suspend; > + unsigned int nr_clk_suspend; > + > + struct clk *clk; > + struct clk **pclks; > + int nr_pclks; > + > + struct samsung_clk_provider *ctx; > +}; > + > /** > * exynos_arm64_init_clocks - Set clocks initial configuration > * @np: CMU device tree node with "reg" property (CMU addr) > @@ -76,10 +92,16 @@ static int __init exynos_arm64_enable_bus_clk(struct device *dev, > if (!cmu->clk_name) > return 0; > > - if (dev) > + if (dev) { > + struct exynos_arm64_cmu_data *data; > + > parent_clk = clk_get(dev, cmu->clk_name); > - else > + data = dev_get_drvdata(dev); > + if (data) > + data->clk = parent_clk; > + } else { > parent_clk = of_clk_get_by_name(np, cmu->clk_name); > + } > > if (IS_ERR(parent_clk)) > return PTR_ERR(parent_clk); > @@ -87,6 +109,46 @@ static int __init exynos_arm64_enable_bus_clk(struct device *dev, > return clk_prepare_enable(parent_clk); > } > > +static int __init exynos_arm64_cmu_prepare_pm(struct device *dev, > + const struct samsung_cmu_info *cmu) > +{ > + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); > + int i; > + > + data->clk_save = samsung_clk_alloc_reg_dump(cmu->clk_regs, > + cmu->nr_clk_regs); > + if (!data->clk_save) > + return -ENOMEM; > + > + data->nr_clk_save = cmu->nr_clk_regs; > + data->clk_suspend = cmu->suspend_regs; > + data->nr_clk_suspend = cmu->nr_suspend_regs; > + data->nr_pclks = of_clk_get_parent_count(dev->of_node); > + if (!data->nr_pclks) > + return 0; > + > + data->pclks = devm_kcalloc(dev, sizeof(struct clk *), data->nr_pclks, > + GFP_KERNEL); > + if (!data->pclks) { > + kfree(data->clk_save); > + return -ENOMEM; > + } > + > + for (i = 0; i < data->nr_pclks; i++) { > + struct clk *clk = of_clk_get(dev->of_node, i); > + > + if (IS_ERR(clk)) { > + kfree(data->clk_save); > + while (--i >= 0) > + clk_put(data->pclks[i]); > + return PTR_ERR(clk); > + } > + data->pclks[i] = clk; > + } > + > + return 0; > +} > + > /** > * exynos_arm64_register_cmu - Register specified Exynos CMU domain > * @dev: Device object; may be NULL if this function is not being > @@ -111,3 +173,108 @@ void __init exynos_arm64_register_cmu(struct device *dev, > exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs); > samsung_cmu_register_one(np, cmu); > } > + > +/** > + * exynos_arm64_register_cmu_pm - Register Exynos CMU domain with PM support > + * > + * @pdev: Platform device object > + * @set_manual: If true, set gate clocks to manual mode > + * > + * It's a version of exynos_arm64_register_cmu() with PM support. Should be > + * called from probe function of platform driver. > + * > + * Return: 0 on success, or negative error code on error. > + */ > +int __init exynos_arm64_register_cmu_pm(struct platform_device *pdev, > + bool set_manual) > +{ > + const struct samsung_cmu_info *cmu; > + struct device *dev = &pdev->dev; > + struct device_node *np = dev->of_node; > + struct exynos_arm64_cmu_data *data; > + void __iomem *reg_base; > + int ret; > + > + cmu = of_device_get_match_data(dev); > + > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + platform_set_drvdata(pdev, data); > + > + ret = exynos_arm64_cmu_prepare_pm(dev, cmu); > + if (ret) > + return ret; > + > + ret = exynos_arm64_enable_bus_clk(dev, NULL, cmu); > + if (ret) > + return ret; > + > + if (set_manual) > + exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs); > + > + reg_base = devm_platform_ioremap_resource(pdev, 0); > + if (IS_ERR(reg_base)) > + return PTR_ERR(reg_base); > + > + data->ctx = samsung_clk_init(dev, reg_base, cmu->nr_clk_ids); > + > + /* > + * Enable runtime PM here to allow the clock core using runtime PM > + * for the registered clocks. Additionally, we increase the runtime > + * PM usage count before registering the clocks, to prevent the > + * clock core from runtime suspending the device. > + */ > + pm_runtime_get_noresume(dev); > + pm_runtime_set_active(dev); > + pm_runtime_enable(dev); > + > + samsung_cmu_register_clocks(data->ctx, cmu); > + samsung_clk_of_add_provider(dev->of_node, data->ctx); > + pm_runtime_put_sync(dev); > + > + return 0; > +} > + > +int exynos_arm64_cmu_suspend(struct device *dev) > +{ > + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); > + int i; > + > + samsung_clk_save(data->ctx->reg_base, data->clk_save, > + data->nr_clk_save); > + > + for (i = 0; i < data->nr_pclks; i++) > + clk_prepare_enable(data->pclks[i]); > + > + /* For suspend some registers have to be set to certain values */ > + samsung_clk_restore(data->ctx->reg_base, data->clk_suspend, > + data->nr_clk_suspend); > + > + for (i = 0; i < data->nr_pclks; i++) > + clk_disable_unprepare(data->pclks[i]); > + > + clk_disable_unprepare(data->clk); > + > + return 0; > +} > + > +int exynos_arm64_cmu_resume(struct device *dev) > +{ > + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); > + int i; > + > + clk_prepare_enable(data->clk); > + > + for (i = 0; i < data->nr_pclks; i++) > + clk_prepare_enable(data->pclks[i]); > + > + samsung_clk_restore(data->ctx->reg_base, data->clk_save, > + data->nr_clk_save); > + > + for (i = 0; i < data->nr_pclks; i++) > + clk_disable_unprepare(data->pclks[i]); > + > + return 0; > +} > diff --git a/drivers/clk/samsung/clk-exynos-arm64.h b/drivers/clk/samsung/clk-exynos-arm64.h > index 0dd174693935..969979e714bc 100644 > --- a/drivers/clk/samsung/clk-exynos-arm64.h > +++ b/drivers/clk/samsung/clk-exynos-arm64.h > @@ -16,5 +16,8 @@ > > void exynos_arm64_register_cmu(struct device *dev, > struct device_node *np, const struct samsung_cmu_info *cmu); > +int exynos_arm64_register_cmu_pm(struct platform_device *pdev, bool set_manual); > +int exynos_arm64_cmu_suspend(struct device *dev); > +int exynos_arm64_cmu_resume(struct device *dev); > > #endif /* __CLK_EXYNOS_ARM64_H */ > diff --git a/drivers/clk/samsung/clk-exynos5433.c b/drivers/clk/samsung/clk-exynos5433.c > index eb72bf2aaee8..ed43233649ae 100644 > --- a/drivers/clk/samsung/clk-exynos5433.c > +++ b/drivers/clk/samsung/clk-exynos5433.c > @@ -10,7 +10,6 @@ > #include <linux/clk-provider.h> > #include <linux/of.h> > #include <linux/of_address.h> > -#include <linux/of_device.h> > #include <linux/platform_device.h> > #include <linux/pm_runtime.h> > #include <linux/slab.h> > @@ -19,6 +18,7 @@ > > #include "clk.h" > #include "clk-cpu.h" > +#include "clk-exynos-arm64.h" > #include "clk-pll.h" > > /* > @@ -5478,160 +5478,9 @@ static const struct samsung_cmu_info imem_cmu_info __initconst = { > .clk_name = "aclk_imem_200", > }; > > -struct exynos5433_cmu_data { > - struct samsung_clk_reg_dump *clk_save; > - unsigned int nr_clk_save; > - const struct samsung_clk_reg_dump *clk_suspend; > - unsigned int nr_clk_suspend; > - > - struct clk *clk; > - struct clk **pclks; > - int nr_pclks; > - > - /* must be the last entry */ > - struct samsung_clk_provider ctx; > -}; > - > -static int __maybe_unused exynos5433_cmu_suspend(struct device *dev) > -{ > - struct exynos5433_cmu_data *data = dev_get_drvdata(dev); > - int i; > - > - samsung_clk_save(data->ctx.reg_base, data->clk_save, > - data->nr_clk_save); > - > - for (i = 0; i < data->nr_pclks; i++) > - clk_prepare_enable(data->pclks[i]); > - > - /* for suspend some registers have to be set to certain values */ > - samsung_clk_restore(data->ctx.reg_base, data->clk_suspend, > - data->nr_clk_suspend); > - > - for (i = 0; i < data->nr_pclks; i++) > - clk_disable_unprepare(data->pclks[i]); > - > - clk_disable_unprepare(data->clk); > - > - return 0; > -} > - > -static int __maybe_unused exynos5433_cmu_resume(struct device *dev) > -{ > - struct exynos5433_cmu_data *data = dev_get_drvdata(dev); > - int i; > - > - clk_prepare_enable(data->clk); > - > - for (i = 0; i < data->nr_pclks; i++) > - clk_prepare_enable(data->pclks[i]); > - > - samsung_clk_restore(data->ctx.reg_base, data->clk_save, > - data->nr_clk_save); > - > - for (i = 0; i < data->nr_pclks; i++) > - clk_disable_unprepare(data->pclks[i]); > - > - return 0; > -} > - > static int __init exynos5433_cmu_probe(struct platform_device *pdev) > { > - const struct samsung_cmu_info *info; > - struct exynos5433_cmu_data *data; > - struct samsung_clk_provider *ctx; > - struct device *dev = &pdev->dev; > - void __iomem *reg_base; > - int i; > - > - info = of_device_get_match_data(dev); > - > - data = devm_kzalloc(dev, > - struct_size(data, ctx.clk_data.hws, info->nr_clk_ids), > - GFP_KERNEL); > - if (!data) > - return -ENOMEM; > - ctx = &data->ctx; > - > - reg_base = devm_platform_ioremap_resource(pdev, 0); > - if (IS_ERR(reg_base)) > - return PTR_ERR(reg_base); > - > - for (i = 0; i < info->nr_clk_ids; ++i) > - ctx->clk_data.hws[i] = ERR_PTR(-ENOENT); > - > - ctx->clk_data.num = info->nr_clk_ids; > - ctx->reg_base = reg_base; > - ctx->dev = dev; > - spin_lock_init(&ctx->lock); > - > - data->clk_save = samsung_clk_alloc_reg_dump(info->clk_regs, > - info->nr_clk_regs); > - if (!data->clk_save) > - return -ENOMEM; > - data->nr_clk_save = info->nr_clk_regs; > - data->clk_suspend = info->suspend_regs; > - data->nr_clk_suspend = info->nr_suspend_regs; > - data->nr_pclks = of_clk_get_parent_count(dev->of_node); > - > - if (data->nr_pclks > 0) { > - data->pclks = devm_kcalloc(dev, sizeof(struct clk *), > - data->nr_pclks, GFP_KERNEL); > - if (!data->pclks) { > - kfree(data->clk_save); > - return -ENOMEM; > - } > - for (i = 0; i < data->nr_pclks; i++) { > - struct clk *clk = of_clk_get(dev->of_node, i); > - > - if (IS_ERR(clk)) { > - kfree(data->clk_save); > - while (--i >= 0) > - clk_put(data->pclks[i]); > - return PTR_ERR(clk); > - } > - data->pclks[i] = clk; > - } > - } > - > - if (info->clk_name) > - data->clk = clk_get(dev, info->clk_name); > - clk_prepare_enable(data->clk); > - > - platform_set_drvdata(pdev, data); > - > - /* > - * Enable runtime PM here to allow the clock core using runtime PM > - * for the registered clocks. Additionally, we increase the runtime > - * PM usage count before registering the clocks, to prevent the > - * clock core from runtime suspending the device. > - */ > - pm_runtime_get_noresume(dev); > - pm_runtime_set_active(dev); > - pm_runtime_enable(dev); > - > - if (info->pll_clks) > - samsung_clk_register_pll(ctx, info->pll_clks, > - info->nr_pll_clks); > - if (info->mux_clks) > - samsung_clk_register_mux(ctx, info->mux_clks, > - info->nr_mux_clks); > - if (info->div_clks) > - samsung_clk_register_div(ctx, info->div_clks, > - info->nr_div_clks); > - if (info->gate_clks) > - samsung_clk_register_gate(ctx, info->gate_clks, > - info->nr_gate_clks); > - if (info->fixed_clks) > - samsung_clk_register_fixed_rate(ctx, info->fixed_clks, > - info->nr_fixed_clks); > - if (info->fixed_factor_clks) > - samsung_clk_register_fixed_factor(ctx, info->fixed_factor_clks, > - info->nr_fixed_factor_clks); > - > - samsung_clk_of_add_provider(dev->of_node, ctx); > - pm_runtime_put_sync(dev); > - > - return 0; > + return exynos_arm64_register_cmu_pm(pdev, false); > } > > static const struct of_device_id exynos5433_cmu_of_match[] = { > @@ -5679,7 +5528,7 @@ static const struct of_device_id exynos5433_cmu_of_match[] = { > }; > > static const struct dev_pm_ops exynos5433_cmu_pm_ops = { > - SET_RUNTIME_PM_OPS(exynos5433_cmu_suspend, exynos5433_cmu_resume, > + SET_RUNTIME_PM_OPS(exynos_arm64_cmu_suspend, exynos_arm64_cmu_resume, > NULL) > SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, > pm_runtime_force_resume) > -- > 2.39.1 >
On 19.02.2023 18:36, Sam Protsenko wrote: > On Wed, 8 Feb 2023 at 17:43, Sam Protsenko <semen.protsenko@linaro.org> wrote: >> Exynos5433 clock driver implements PM support internally, which might be >> also useful for other Exynos clock drivers. Extract all PM related code >> from clk-exynos5433 to common ARM64 functions. >> >> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> >> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> >> --- >> Changes in v2: >> - Rebased on top of latest soc/for-next tree >> - Included linux/slab.h for kfree (found by kernel test robot) >> >> drivers/clk/samsung/clk-exynos-arm64.c | 171 ++++++++++++++++++++++++- >> drivers/clk/samsung/clk-exynos-arm64.h | 3 + >> drivers/clk/samsung/clk-exynos5433.c | 157 +---------------------- >> 3 files changed, 175 insertions(+), 156 deletions(-) >> >> diff --git a/drivers/clk/samsung/clk-exynos-arm64.c b/drivers/clk/samsung/clk-exynos-arm64.c >> index 2aa3f0a5644e..7ad7fd353dda 100644 >> --- a/drivers/clk/samsung/clk-exynos-arm64.c >> +++ b/drivers/clk/samsung/clk-exynos-arm64.c >> @@ -10,6 +10,9 @@ >> */ > Hi Marek, > > It just occurred to me that as I'm pulling your code from > clk-exynos5433.c here, I should've probably added you to this file's > author list in the header comment. Does that sound right to you? If > so, I can re-send v3 with fixes. Fine for me. > Also, could you please review this series, if possible? I'm working > right now on PM_DOMAINS support for Exynos850, so along with this > series that would bring the initial PM support for ARM64 Exynos chips. Well, feel free to add: Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> to v3 (the whole patchset). The only remark I have is not strictly related to this patchset, but the code that is already in drivers/clk/samsung/clk-exynos-arm64.c. Playing with GATE_ENABLE_HWACG/GATE_MANUAL is not strictly specific to all Exynos ARM64 SoCs. GATE_OFF_START/GATE_OFF_END and the enable register bits are something specific to recent Exynos SoCs (like 7885/850/auto9) and don't fit well into the generic arm64 clk PM code, but I don't have a good idea how to move it to the respective clk drivers and keep it simple. Best regards
On Tue, 21 Feb 2023 at 01:22, Marek Szyprowski <m.szyprowski@samsung.com> wrote: > > On 19.02.2023 18:36, Sam Protsenko wrote: > > On Wed, 8 Feb 2023 at 17:43, Sam Protsenko <semen.protsenko@linaro.org> wrote: > >> Exynos5433 clock driver implements PM support internally, which might be > >> also useful for other Exynos clock drivers. Extract all PM related code > >> from clk-exynos5433 to common ARM64 functions. > >> > >> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> > >> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> > >> --- > >> Changes in v2: > >> - Rebased on top of latest soc/for-next tree > >> - Included linux/slab.h for kfree (found by kernel test robot) > >> > >> drivers/clk/samsung/clk-exynos-arm64.c | 171 ++++++++++++++++++++++++- > >> drivers/clk/samsung/clk-exynos-arm64.h | 3 + > >> drivers/clk/samsung/clk-exynos5433.c | 157 +---------------------- > >> 3 files changed, 175 insertions(+), 156 deletions(-) > >> > >> diff --git a/drivers/clk/samsung/clk-exynos-arm64.c b/drivers/clk/samsung/clk-exynos-arm64.c > >> index 2aa3f0a5644e..7ad7fd353dda 100644 > >> --- a/drivers/clk/samsung/clk-exynos-arm64.c > >> +++ b/drivers/clk/samsung/clk-exynos-arm64.c > >> @@ -10,6 +10,9 @@ > >> */ > > Hi Marek, > > > > It just occurred to me that as I'm pulling your code from > > clk-exynos5433.c here, I should've probably added you to this file's > > author list in the header comment. Does that sound right to you? If > > so, I can re-send v3 with fixes. > > Fine for me. > > > Also, could you please review this series, if possible? I'm working > > right now on PM_DOMAINS support for Exynos850, so along with this > > series that would bring the initial PM support for ARM64 Exynos chips. > > Well, feel free to add: > > Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> > > to v3 (the whole patchset). > Thanks, Marek! > The only remark I have is not strictly related to this patchset, but the > code that is already in drivers/clk/samsung/clk-exynos-arm64.c. Playing > with GATE_ENABLE_HWACG/GATE_MANUAL is not strictly specific to all > Exynos ARM64 SoCs. GATE_OFF_START/GATE_OFF_END and the enable register > bits are something specific to recent Exynos SoCs (like 7885/850/auto9) > and don't fit well into the generic arm64 clk PM code, but I don't have > a good idea how to move it to the respective clk drivers and keep it simple. > Yeah, maybe having some sort of HW variants would be a better choice. That can be implemented later. I suggest we wait a bit first (after applying this series) and see if there going be any new users for that PM code. Once we gather more knowledge about current platforms (or no), the desired design decisions should become more obvious. > > Best regards > -- > Marek Szyprowski, PhD > Samsung R&D Institute Poland >
diff --git a/drivers/clk/samsung/clk-exynos-arm64.c b/drivers/clk/samsung/clk-exynos-arm64.c index 2aa3f0a5644e..7ad7fd353dda 100644 --- a/drivers/clk/samsung/clk-exynos-arm64.c +++ b/drivers/clk/samsung/clk-exynos-arm64.c @@ -10,6 +10,9 @@ */ #include <linux/clk.h> #include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> #include "clk-exynos-arm64.h" @@ -21,6 +24,19 @@ #define GATE_OFF_START 0x2000 #define GATE_OFF_END 0x2fff +struct exynos_arm64_cmu_data { + struct samsung_clk_reg_dump *clk_save; + unsigned int nr_clk_save; + const struct samsung_clk_reg_dump *clk_suspend; + unsigned int nr_clk_suspend; + + struct clk *clk; + struct clk **pclks; + int nr_pclks; + + struct samsung_clk_provider *ctx; +}; + /** * exynos_arm64_init_clocks - Set clocks initial configuration * @np: CMU device tree node with "reg" property (CMU addr) @@ -76,10 +92,16 @@ static int __init exynos_arm64_enable_bus_clk(struct device *dev, if (!cmu->clk_name) return 0; - if (dev) + if (dev) { + struct exynos_arm64_cmu_data *data; + parent_clk = clk_get(dev, cmu->clk_name); - else + data = dev_get_drvdata(dev); + if (data) + data->clk = parent_clk; + } else { parent_clk = of_clk_get_by_name(np, cmu->clk_name); + } if (IS_ERR(parent_clk)) return PTR_ERR(parent_clk); @@ -87,6 +109,46 @@ static int __init exynos_arm64_enable_bus_clk(struct device *dev, return clk_prepare_enable(parent_clk); } +static int __init exynos_arm64_cmu_prepare_pm(struct device *dev, + const struct samsung_cmu_info *cmu) +{ + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); + int i; + + data->clk_save = samsung_clk_alloc_reg_dump(cmu->clk_regs, + cmu->nr_clk_regs); + if (!data->clk_save) + return -ENOMEM; + + data->nr_clk_save = cmu->nr_clk_regs; + data->clk_suspend = cmu->suspend_regs; + data->nr_clk_suspend = cmu->nr_suspend_regs; + data->nr_pclks = of_clk_get_parent_count(dev->of_node); + if (!data->nr_pclks) + return 0; + + data->pclks = devm_kcalloc(dev, sizeof(struct clk *), data->nr_pclks, + GFP_KERNEL); + if (!data->pclks) { + kfree(data->clk_save); + return -ENOMEM; + } + + for (i = 0; i < data->nr_pclks; i++) { + struct clk *clk = of_clk_get(dev->of_node, i); + + if (IS_ERR(clk)) { + kfree(data->clk_save); + while (--i >= 0) + clk_put(data->pclks[i]); + return PTR_ERR(clk); + } + data->pclks[i] = clk; + } + + return 0; +} + /** * exynos_arm64_register_cmu - Register specified Exynos CMU domain * @dev: Device object; may be NULL if this function is not being @@ -111,3 +173,108 @@ void __init exynos_arm64_register_cmu(struct device *dev, exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs); samsung_cmu_register_one(np, cmu); } + +/** + * exynos_arm64_register_cmu_pm - Register Exynos CMU domain with PM support + * + * @pdev: Platform device object + * @set_manual: If true, set gate clocks to manual mode + * + * It's a version of exynos_arm64_register_cmu() with PM support. Should be + * called from probe function of platform driver. + * + * Return: 0 on success, or negative error code on error. + */ +int __init exynos_arm64_register_cmu_pm(struct platform_device *pdev, + bool set_manual) +{ + const struct samsung_cmu_info *cmu; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct exynos_arm64_cmu_data *data; + void __iomem *reg_base; + int ret; + + cmu = of_device_get_match_data(dev); + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + platform_set_drvdata(pdev, data); + + ret = exynos_arm64_cmu_prepare_pm(dev, cmu); + if (ret) + return ret; + + ret = exynos_arm64_enable_bus_clk(dev, NULL, cmu); + if (ret) + return ret; + + if (set_manual) + exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs); + + reg_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(reg_base)) + return PTR_ERR(reg_base); + + data->ctx = samsung_clk_init(dev, reg_base, cmu->nr_clk_ids); + + /* + * Enable runtime PM here to allow the clock core using runtime PM + * for the registered clocks. Additionally, we increase the runtime + * PM usage count before registering the clocks, to prevent the + * clock core from runtime suspending the device. + */ + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + samsung_cmu_register_clocks(data->ctx, cmu); + samsung_clk_of_add_provider(dev->of_node, data->ctx); + pm_runtime_put_sync(dev); + + return 0; +} + +int exynos_arm64_cmu_suspend(struct device *dev) +{ + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); + int i; + + samsung_clk_save(data->ctx->reg_base, data->clk_save, + data->nr_clk_save); + + for (i = 0; i < data->nr_pclks; i++) + clk_prepare_enable(data->pclks[i]); + + /* For suspend some registers have to be set to certain values */ + samsung_clk_restore(data->ctx->reg_base, data->clk_suspend, + data->nr_clk_suspend); + + for (i = 0; i < data->nr_pclks; i++) + clk_disable_unprepare(data->pclks[i]); + + clk_disable_unprepare(data->clk); + + return 0; +} + +int exynos_arm64_cmu_resume(struct device *dev) +{ + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); + int i; + + clk_prepare_enable(data->clk); + + for (i = 0; i < data->nr_pclks; i++) + clk_prepare_enable(data->pclks[i]); + + samsung_clk_restore(data->ctx->reg_base, data->clk_save, + data->nr_clk_save); + + for (i = 0; i < data->nr_pclks; i++) + clk_disable_unprepare(data->pclks[i]); + + return 0; +} diff --git a/drivers/clk/samsung/clk-exynos-arm64.h b/drivers/clk/samsung/clk-exynos-arm64.h index 0dd174693935..969979e714bc 100644 --- a/drivers/clk/samsung/clk-exynos-arm64.h +++ b/drivers/clk/samsung/clk-exynos-arm64.h @@ -16,5 +16,8 @@ void exynos_arm64_register_cmu(struct device *dev, struct device_node *np, const struct samsung_cmu_info *cmu); +int exynos_arm64_register_cmu_pm(struct platform_device *pdev, bool set_manual); +int exynos_arm64_cmu_suspend(struct device *dev); +int exynos_arm64_cmu_resume(struct device *dev); #endif /* __CLK_EXYNOS_ARM64_H */ diff --git a/drivers/clk/samsung/clk-exynos5433.c b/drivers/clk/samsung/clk-exynos5433.c index eb72bf2aaee8..ed43233649ae 100644 --- a/drivers/clk/samsung/clk-exynos5433.c +++ b/drivers/clk/samsung/clk-exynos5433.c @@ -10,7 +10,6 @@ #include <linux/clk-provider.h> #include <linux/of.h> #include <linux/of_address.h> -#include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/slab.h> @@ -19,6 +18,7 @@ #include "clk.h" #include "clk-cpu.h" +#include "clk-exynos-arm64.h" #include "clk-pll.h" /* @@ -5478,160 +5478,9 @@ static const struct samsung_cmu_info imem_cmu_info __initconst = { .clk_name = "aclk_imem_200", }; -struct exynos5433_cmu_data { - struct samsung_clk_reg_dump *clk_save; - unsigned int nr_clk_save; - const struct samsung_clk_reg_dump *clk_suspend; - unsigned int nr_clk_suspend; - - struct clk *clk; - struct clk **pclks; - int nr_pclks; - - /* must be the last entry */ - struct samsung_clk_provider ctx; -}; - -static int __maybe_unused exynos5433_cmu_suspend(struct device *dev) -{ - struct exynos5433_cmu_data *data = dev_get_drvdata(dev); - int i; - - samsung_clk_save(data->ctx.reg_base, data->clk_save, - data->nr_clk_save); - - for (i = 0; i < data->nr_pclks; i++) - clk_prepare_enable(data->pclks[i]); - - /* for suspend some registers have to be set to certain values */ - samsung_clk_restore(data->ctx.reg_base, data->clk_suspend, - data->nr_clk_suspend); - - for (i = 0; i < data->nr_pclks; i++) - clk_disable_unprepare(data->pclks[i]); - - clk_disable_unprepare(data->clk); - - return 0; -} - -static int __maybe_unused exynos5433_cmu_resume(struct device *dev) -{ - struct exynos5433_cmu_data *data = dev_get_drvdata(dev); - int i; - - clk_prepare_enable(data->clk); - - for (i = 0; i < data->nr_pclks; i++) - clk_prepare_enable(data->pclks[i]); - - samsung_clk_restore(data->ctx.reg_base, data->clk_save, - data->nr_clk_save); - - for (i = 0; i < data->nr_pclks; i++) - clk_disable_unprepare(data->pclks[i]); - - return 0; -} - static int __init exynos5433_cmu_probe(struct platform_device *pdev) { - const struct samsung_cmu_info *info; - struct exynos5433_cmu_data *data; - struct samsung_clk_provider *ctx; - struct device *dev = &pdev->dev; - void __iomem *reg_base; - int i; - - info = of_device_get_match_data(dev); - - data = devm_kzalloc(dev, - struct_size(data, ctx.clk_data.hws, info->nr_clk_ids), - GFP_KERNEL); - if (!data) - return -ENOMEM; - ctx = &data->ctx; - - reg_base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(reg_base)) - return PTR_ERR(reg_base); - - for (i = 0; i < info->nr_clk_ids; ++i) - ctx->clk_data.hws[i] = ERR_PTR(-ENOENT); - - ctx->clk_data.num = info->nr_clk_ids; - ctx->reg_base = reg_base; - ctx->dev = dev; - spin_lock_init(&ctx->lock); - - data->clk_save = samsung_clk_alloc_reg_dump(info->clk_regs, - info->nr_clk_regs); - if (!data->clk_save) - return -ENOMEM; - data->nr_clk_save = info->nr_clk_regs; - data->clk_suspend = info->suspend_regs; - data->nr_clk_suspend = info->nr_suspend_regs; - data->nr_pclks = of_clk_get_parent_count(dev->of_node); - - if (data->nr_pclks > 0) { - data->pclks = devm_kcalloc(dev, sizeof(struct clk *), - data->nr_pclks, GFP_KERNEL); - if (!data->pclks) { - kfree(data->clk_save); - return -ENOMEM; - } - for (i = 0; i < data->nr_pclks; i++) { - struct clk *clk = of_clk_get(dev->of_node, i); - - if (IS_ERR(clk)) { - kfree(data->clk_save); - while (--i >= 0) - clk_put(data->pclks[i]); - return PTR_ERR(clk); - } - data->pclks[i] = clk; - } - } - - if (info->clk_name) - data->clk = clk_get(dev, info->clk_name); - clk_prepare_enable(data->clk); - - platform_set_drvdata(pdev, data); - - /* - * Enable runtime PM here to allow the clock core using runtime PM - * for the registered clocks. Additionally, we increase the runtime - * PM usage count before registering the clocks, to prevent the - * clock core from runtime suspending the device. - */ - pm_runtime_get_noresume(dev); - pm_runtime_set_active(dev); - pm_runtime_enable(dev); - - if (info->pll_clks) - samsung_clk_register_pll(ctx, info->pll_clks, - info->nr_pll_clks); - if (info->mux_clks) - samsung_clk_register_mux(ctx, info->mux_clks, - info->nr_mux_clks); - if (info->div_clks) - samsung_clk_register_div(ctx, info->div_clks, - info->nr_div_clks); - if (info->gate_clks) - samsung_clk_register_gate(ctx, info->gate_clks, - info->nr_gate_clks); - if (info->fixed_clks) - samsung_clk_register_fixed_rate(ctx, info->fixed_clks, - info->nr_fixed_clks); - if (info->fixed_factor_clks) - samsung_clk_register_fixed_factor(ctx, info->fixed_factor_clks, - info->nr_fixed_factor_clks); - - samsung_clk_of_add_provider(dev->of_node, ctx); - pm_runtime_put_sync(dev); - - return 0; + return exynos_arm64_register_cmu_pm(pdev, false); } static const struct of_device_id exynos5433_cmu_of_match[] = { @@ -5679,7 +5528,7 @@ static const struct of_device_id exynos5433_cmu_of_match[] = { }; static const struct dev_pm_ops exynos5433_cmu_pm_ops = { - SET_RUNTIME_PM_OPS(exynos5433_cmu_suspend, exynos5433_cmu_resume, + SET_RUNTIME_PM_OPS(exynos_arm64_cmu_suspend, exynos_arm64_cmu_resume, NULL) SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)