diff options
| -rw-r--r-- | drivers/pmdomain/sunxi/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/pmdomain/sunxi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pmdomain/sunxi/sun50i-h6-prcm-ppu.c | 208 |
3 files changed, 219 insertions, 0 deletions
diff --git a/drivers/pmdomain/sunxi/Kconfig b/drivers/pmdomain/sunxi/Kconfig index 17781bf8d86d..43eecb3ea981 100644 --- a/drivers/pmdomain/sunxi/Kconfig +++ b/drivers/pmdomain/sunxi/Kconfig @@ -8,3 +8,13 @@ config SUN20I_PPU help Say y to enable the PPU power domain driver. This saves power when certain peripherals, such as the video engine, are idle. + +config SUN50I_H6_PRCM_PPU + tristate "Allwinner H6 PRCM power domain driver" + depends on ARCH_SUNXI || COMPILE_TEST + depends on PM + select PM_GENERIC_DOMAINS + help + Say y to enable the Allwinner H6/H616 PRCM power domain driver. + This is required to enable the Mali GPU in the H616 SoC, it is + optional for the H6. diff --git a/drivers/pmdomain/sunxi/Makefile b/drivers/pmdomain/sunxi/Makefile index ec1d7a2fb21d..c1343e123759 100644 --- a/drivers/pmdomain/sunxi/Makefile +++ b/drivers/pmdomain/sunxi/Makefile @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_SUN20I_PPU) += sun20i-ppu.o +obj-$(CONFIG_SUN50I_H6_PRCM_PPU) += sun50i-h6-prcm-ppu.o diff --git a/drivers/pmdomain/sunxi/sun50i-h6-prcm-ppu.c b/drivers/pmdomain/sunxi/sun50i-h6-prcm-ppu.c new file mode 100644 index 000000000000..d59644499dfe --- /dev/null +++ b/drivers/pmdomain/sunxi/sun50i-h6-prcm-ppu.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) Arm Ltd. 2024 + * + * Allwinner H6/H616 PRCM power domain driver. + * This covers a few registers inside the PRCM (Power Reset Clock Management) + * block that control some power rails, most prominently for the Mali GPU. + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_domain.h> +#include <linux/reset.h> + +/* + * The PRCM block covers multiple devices, starting with some clocks, + * then followed by the power rails. + * The clocks are covered by a different driver, so this driver's MMIO range + * starts later in the PRCM MMIO frame, not at the beginning of it. + * To keep the register offsets consistent with other PRCM documentation, + * express the registers relative to the beginning of the whole PRCM, and + * subtract the PPU offset this driver is bound to. + */ +#define PD_H6_PPU_OFFSET 0x250 +#define PD_H6_VDD_SYS_REG 0x250 +#define PD_H616_ANA_VDD_GATE BIT(4) +#define PD_H6_CPUS_VDD_GATE BIT(3) +#define PD_H6_AVCC_VDD_GATE BIT(2) +#define PD_H6_GPU_REG 0x254 +#define PD_H6_GPU_GATE BIT(0) + +struct sun50i_h6_ppu_pd { + struct generic_pm_domain genpd; + void __iomem *reg; + u32 gate_mask; + bool negated; +}; + +#define FLAG_PPU_ALWAYS_ON BIT(0) +#define FLAG_PPU_NEGATED BIT(1) + +struct sun50i_h6_ppu_desc { + const char *name; + u32 offset; + u32 mask; + unsigned int flags; +}; + +static const struct sun50i_h6_ppu_desc sun50i_h6_ppus[] = { + { "AVCC", PD_H6_VDD_SYS_REG, PD_H6_AVCC_VDD_GATE }, + { "CPUS", PD_H6_VDD_SYS_REG, PD_H6_CPUS_VDD_GATE }, + { "GPU", PD_H6_GPU_REG, PD_H6_GPU_GATE }, +}; +static const struct sun50i_h6_ppu_desc sun50i_h616_ppus[] = { + { "PLL", PD_H6_VDD_SYS_REG, PD_H6_AVCC_VDD_GATE, + FLAG_PPU_ALWAYS_ON | FLAG_PPU_NEGATED }, + { "ANA", PD_H6_VDD_SYS_REG, PD_H616_ANA_VDD_GATE, FLAG_PPU_ALWAYS_ON }, + { "GPU", PD_H6_GPU_REG, PD_H6_GPU_GATE, FLAG_PPU_NEGATED }, +}; + +struct sun50i_h6_ppu_data { + const struct sun50i_h6_ppu_desc *descs; + int nr_domains; +}; + +static const struct sun50i_h6_ppu_data sun50i_h6_ppu_data = { + .descs = sun50i_h6_ppus, + .nr_domains = ARRAY_SIZE(sun50i_h6_ppus), +}; + +static const struct sun50i_h6_ppu_data sun50i_h616_ppu_data = { + .descs = sun50i_h616_ppus, + .nr_domains = ARRAY_SIZE(sun50i_h616_ppus), +}; + +#define to_sun50i_h6_ppu_pd(_genpd) \ + container_of(_genpd, struct sun50i_h6_ppu_pd, genpd) + +static bool sun50i_h6_ppu_power_status(const struct sun50i_h6_ppu_pd *pd) +{ + bool bit = readl(pd->reg) & pd->gate_mask; + + return bit ^ pd->negated; +} + +static int sun50i_h6_ppu_pd_set_power(const struct sun50i_h6_ppu_pd *pd, + bool set_bit) +{ + u32 reg = readl(pd->reg); + + if (set_bit) + writel(reg | pd->gate_mask, pd->reg); + else + writel(reg & ~pd->gate_mask, pd->reg); + + return 0; +} + +static int sun50i_h6_ppu_pd_power_on(struct generic_pm_domain *genpd) +{ + const struct sun50i_h6_ppu_pd *pd = to_sun50i_h6_ppu_pd(genpd); + + return sun50i_h6_ppu_pd_set_power(pd, !pd->negated); +} + +static int sun50i_h6_ppu_pd_power_off(struct generic_pm_domain *genpd) +{ + const struct sun50i_h6_ppu_pd *pd = to_sun50i_h6_ppu_pd(genpd); + + return sun50i_h6_ppu_pd_set_power(pd, pd->negated); +} + +static int sun50i_h6_ppu_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct genpd_onecell_data *ppu; + struct sun50i_h6_ppu_pd *pds; + const struct sun50i_h6_ppu_data *data; + void __iomem *base; + int ret, i; + + data = of_device_get_match_data(dev); + if (!data) + return -EINVAL; + + pds = devm_kcalloc(dev, data->nr_domains, sizeof(*pds), GFP_KERNEL); + if (!pds) + return -ENOMEM; + + ppu = devm_kzalloc(dev, sizeof(*ppu), GFP_KERNEL); + if (!ppu) + return -ENOMEM; + + ppu->num_domains = data->nr_domains; + ppu->domains = devm_kcalloc(dev, data->nr_domains, + sizeof(*ppu->domains), GFP_KERNEL); + if (!ppu->domains) + return -ENOMEM; + + platform_set_drvdata(pdev, ppu); + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + for (i = 0; i < data->nr_domains; i++) { + struct sun50i_h6_ppu_pd *pd = &pds[i]; + const struct sun50i_h6_ppu_desc *desc = &data->descs[i]; + + pd->genpd.name = desc->name; + pd->genpd.power_off = sun50i_h6_ppu_pd_power_off; + pd->genpd.power_on = sun50i_h6_ppu_pd_power_on; + if (desc->flags & FLAG_PPU_ALWAYS_ON) + pd->genpd.flags = GENPD_FLAG_ALWAYS_ON; + pd->negated = !!(desc->flags & FLAG_PPU_NEGATED); + pd->reg = base + desc->offset - PD_H6_PPU_OFFSET; + pd->gate_mask = desc->mask; + + ret = pm_genpd_init(&pd->genpd, NULL, + !sun50i_h6_ppu_power_status(pd)); + if (ret) { + dev_warn(dev, "Failed to add %s power domain: %d\n", + desc->name, ret); + goto out_remove_pds; + } + ppu->domains[i] = &pd->genpd; + } + + ret = of_genpd_add_provider_onecell(dev->of_node, ppu); + if (!ret) + return 0; + + dev_warn(dev, "Failed to add provider: %d\n", ret); +out_remove_pds: + for (i--; i >= 0; i--) + pm_genpd_remove(&pds[i].genpd); + + return ret; +} + +static const struct of_device_id sun50i_h6_ppu_of_match[] = { + { .compatible = "allwinner,sun50i-h6-prcm-ppu", + .data = &sun50i_h6_ppu_data }, + { .compatible = "allwinner,sun50i-h616-prcm-ppu", + .data = &sun50i_h616_ppu_data }, + { } +}; +MODULE_DEVICE_TABLE(of, sun50i_h6_ppu_of_match); + +static struct platform_driver sun50i_h6_ppu_driver = { + .probe = sun50i_h6_ppu_probe, + .driver = { + .name = "sun50i-h6-prcm-ppu", + .of_match_table = sun50i_h6_ppu_of_match, + /* Power domains cannot be removed while they are in use. */ + .suppress_bind_attrs = true, + }, +}; +module_platform_driver(sun50i_h6_ppu_driver); + +MODULE_AUTHOR("Andre Przywara <andre.przywara@arm.com>"); +MODULE_DESCRIPTION("Allwinner H6 PRCM power domain driver"); +MODULE_LICENSE("GPL"); |