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Subject[PATCH v2 2/5] soc: amlogic: Add support for Everything-Else power domains controller
Date
Add support for the General Purpose Amlogic Everything-Else Power controller,
with the first support for G12A and SM1 SoCs dedicated to the VPU, PCIe,
USB, NNA, GE2D and Ethernet Power Domains.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
drivers/soc/amlogic/Kconfig | 11 +
drivers/soc/amlogic/Makefile | 1 +
drivers/soc/amlogic/meson-ee-pwrc.c | 492 ++++++++++++++++++++++++++++
3 files changed, 504 insertions(+)
create mode 100644 drivers/soc/amlogic/meson-ee-pwrc.c

diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig
index 23bfb8ef4fdb..bc2c912949bd 100644
--- a/drivers/soc/amlogic/Kconfig
+++ b/drivers/soc/amlogic/Kconfig
@@ -37,6 +37,17 @@ config MESON_GX_PM_DOMAINS
Say yes to expose Amlogic Meson GX Power Domains as
Generic Power Domains.

+config MESON_EE_PM_DOMAINS
+ bool "Amlogic Meson Everything-Else Power Domains driver"
+ depends on ARCH_MESON || COMPILE_TEST
+ depends on PM && OF
+ default ARCH_MESON
+ select PM_GENERIC_DOMAINS
+ select PM_GENERIC_DOMAINS_OF
+ help
+ Say yes to expose Amlogic Meson Everything-Else Power Domains as
+ Generic Power Domains.
+
config MESON_MX_SOCINFO
bool "Amlogic Meson MX SoC Information driver"
depends on ARCH_MESON || COMPILE_TEST
diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile
index f2e4ed171297..de79d044b545 100644
--- a/drivers/soc/amlogic/Makefile
+++ b/drivers/soc/amlogic/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_MESON_CLK_MEASURE) += meson-clk-measure.o
obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
obj-$(CONFIG_MESON_GX_PM_DOMAINS) += meson-gx-pwrc-vpu.o
obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o
+obj-$(CONFIG_MESON_EE_PM_DOMAINS) += meson-ee-pwrc.o
diff --git a/drivers/soc/amlogic/meson-ee-pwrc.c b/drivers/soc/amlogic/meson-ee-pwrc.c
new file mode 100644
index 000000000000..5823f5b67d16
--- /dev/null
+++ b/drivers/soc/amlogic/meson-ee-pwrc.c
@@ -0,0 +1,492 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2019 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/bitfield.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_device.h>
+#include <linux/reset-controller.h>
+#include <linux/reset.h>
+#include <linux/clk.h>
+#include <dt-bindings/power/meson-g12a-power.h>
+#include <dt-bindings/power/meson-sm1-power.h>
+
+/* AO Offsets */
+
+#define AO_RTI_GEN_PWR_SLEEP0 (0x3a << 2)
+#define AO_RTI_GEN_PWR_ISO0 (0x3b << 2)
+
+/* HHI Offsets */
+
+#define HHI_MEM_PD_REG0 (0x40 << 2)
+#define HHI_VPU_MEM_PD_REG0 (0x41 << 2)
+#define HHI_VPU_MEM_PD_REG1 (0x42 << 2)
+#define HHI_VPU_MEM_PD_REG3 (0x43 << 2)
+#define HHI_VPU_MEM_PD_REG4 (0x44 << 2)
+#define HHI_AUDIO_MEM_PD_REG0 (0x45 << 2)
+#define HHI_NANOQ_MEM_PD_REG0 (0x46 << 2)
+#define HHI_NANOQ_MEM_PD_REG1 (0x47 << 2)
+#define HHI_VPU_MEM_PD_REG2 (0x4d << 2)
+
+struct meson_ee_pwrc;
+struct meson_ee_pwrc_domain;
+
+struct meson_ee_pwrc_mem_domain {
+ unsigned int reg;
+ unsigned int mask;
+};
+
+struct meson_ee_pwrc_top_domain {
+ unsigned int sleep_reg;
+ unsigned int sleep_mask;
+ unsigned int iso_reg;
+ unsigned int iso_mask;
+};
+
+struct meson_ee_pwrc_domain_desc {
+ char *name;
+ unsigned int reset_names_count;
+ unsigned int clk_names_count;
+ struct meson_ee_pwrc_top_domain *top_pd;
+ unsigned int mem_pd_count;
+ struct meson_ee_pwrc_mem_domain *mem_pd;
+ bool (*get_power)(struct meson_ee_pwrc_domain *pwrc_domain);
+};
+
+struct meson_ee_pwrc_domain_data {
+ unsigned int count;
+ struct meson_ee_pwrc_domain_desc *domains;
+};
+
+/* TOP Power Domains */
+
+static struct meson_ee_pwrc_top_domain g12a_pwrc_vpu = {
+ .sleep_reg = AO_RTI_GEN_PWR_SLEEP0,
+ .sleep_mask = BIT(8),
+ .iso_reg = AO_RTI_GEN_PWR_SLEEP0,
+ .iso_mask = BIT(9),
+};
+
+#define SM1_EE_PD(__bit) \
+ { \
+ .sleep_reg = AO_RTI_GEN_PWR_SLEEP0, \
+ .sleep_mask = BIT(__bit), \
+ .iso_reg = AO_RTI_GEN_PWR_ISO0, \
+ .iso_mask = BIT(__bit), \
+ }
+
+static struct meson_ee_pwrc_top_domain sm1_pwrc_vpu = SM1_EE_PD(8);
+static struct meson_ee_pwrc_top_domain sm1_pwrc_nna = SM1_EE_PD(16);
+static struct meson_ee_pwrc_top_domain sm1_pwrc_usb = SM1_EE_PD(17);
+static struct meson_ee_pwrc_top_domain sm1_pwrc_pci = SM1_EE_PD(18);
+static struct meson_ee_pwrc_top_domain sm1_pwrc_ge2d = SM1_EE_PD(19);
+
+/* Memory PD Domains */
+
+#define VPU_MEMPD(__reg) \
+ { __reg, GENMASK(1, 0) }, \
+ { __reg, GENMASK(3, 2) }, \
+ { __reg, GENMASK(5, 4) }, \
+ { __reg, GENMASK(7, 6) }, \
+ { __reg, GENMASK(9, 8) }, \
+ { __reg, GENMASK(11, 10) }, \
+ { __reg, GENMASK(13, 12) }, \
+ { __reg, GENMASK(15, 14) }, \
+ { __reg, GENMASK(17, 16) }, \
+ { __reg, GENMASK(19, 18) }, \
+ { __reg, GENMASK(21, 20) }, \
+ { __reg, GENMASK(23, 22) }, \
+ { __reg, GENMASK(25, 24) }, \
+ { __reg, GENMASK(27, 26) }, \
+ { __reg, GENMASK(29, 28) }, \
+ { __reg, GENMASK(31, 30) }
+
+#define VPU_HHI_MEMPD(__reg) \
+ { __reg, BIT(8) }, \
+ { __reg, BIT(9) }, \
+ { __reg, BIT(10) }, \
+ { __reg, BIT(11) }, \
+ { __reg, BIT(12) }, \
+ { __reg, BIT(13) }, \
+ { __reg, BIT(14) }, \
+ { __reg, BIT(15) }
+
+static struct meson_ee_pwrc_mem_domain g12a_pwrc_mem_vpu[] = {
+ VPU_MEMPD(HHI_VPU_MEM_PD_REG0),
+ VPU_MEMPD(HHI_VPU_MEM_PD_REG1),
+ VPU_MEMPD(HHI_VPU_MEM_PD_REG2),
+ VPU_HHI_MEMPD(HHI_MEM_PD_REG0),
+};
+
+static struct meson_ee_pwrc_mem_domain g12a_pwrc_mem_eth[] = {
+ { HHI_MEM_PD_REG0, GENMASK(3, 2) },
+};
+
+static struct meson_ee_pwrc_mem_domain sm1_pwrc_mem_vpu[] = {
+ VPU_MEMPD(HHI_VPU_MEM_PD_REG0),
+ VPU_MEMPD(HHI_VPU_MEM_PD_REG1),
+ VPU_MEMPD(HHI_VPU_MEM_PD_REG2),
+ VPU_MEMPD(HHI_VPU_MEM_PD_REG3),
+ { HHI_VPU_MEM_PD_REG4, GENMASK(1, 0) },
+ { HHI_VPU_MEM_PD_REG4, GENMASK(3, 2) },
+ { HHI_VPU_MEM_PD_REG4, GENMASK(5, 4) },
+ { HHI_VPU_MEM_PD_REG4, GENMASK(7, 6) },
+ VPU_HHI_MEMPD(HHI_MEM_PD_REG0),
+};
+
+static struct meson_ee_pwrc_mem_domain sm1_pwrc_mem_nna[] = {
+ { HHI_NANOQ_MEM_PD_REG0, 0xff },
+ { HHI_NANOQ_MEM_PD_REG1, 0xff },
+};
+
+static struct meson_ee_pwrc_mem_domain sm1_pwrc_mem_usb[] = {
+ { HHI_MEM_PD_REG0, GENMASK(31, 30) },
+};
+
+static struct meson_ee_pwrc_mem_domain sm1_pwrc_mem_pcie[] = {
+ { HHI_MEM_PD_REG0, GENMASK(29, 26) },
+};
+
+static struct meson_ee_pwrc_mem_domain sm1_pwrc_mem_ge2d[] = {
+ { HHI_MEM_PD_REG0, GENMASK(25, 18) },
+};
+
+static struct meson_ee_pwrc_mem_domain sm1_pwrc_mem_audio[] = {
+ { HHI_MEM_PD_REG0, GENMASK(5, 4) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(1, 0) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(3, 2) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(5, 4) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(7, 6) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(13, 12) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(15, 14) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(17, 16) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(19, 18) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(21, 20) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(23, 22) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(25, 24) },
+ { HHI_AUDIO_MEM_PD_REG0, GENMASK(27, 26) },
+};
+
+#define VPU_PD(__name, __top_pd, __mem, __get_power, __resets, __clks) \
+ { \
+ .name = __name, \
+ .reset_names_count = __resets, \
+ .clk_names_count = __clks, \
+ .top_pd = __top_pd, \
+ .mem_pd_count = ARRAY_SIZE(__mem), \
+ .mem_pd = __mem, \
+ .get_power = __get_power, \
+ }
+
+#define TOP_PD(__name, __top_pd, __mem, __get_power) \
+ { \
+ .name = __name, \
+ .top_pd = __top_pd, \
+ .mem_pd_count = ARRAY_SIZE(__mem), \
+ .mem_pd = __mem, \
+ .get_power = __get_power, \
+ }
+
+#define MEM_PD(__name, __mem) \
+ TOP_PD(__name, NULL, __mem, NULL)
+
+static bool pwrc_ee_get_power(struct meson_ee_pwrc_domain *pwrc_domain);
+
+static struct meson_ee_pwrc_domain_desc g12a_pwrc_domains[] = {
+ [PWRC_G12A_VPU_ID] = VPU_PD("VPU", &g12a_pwrc_vpu, g12a_pwrc_mem_vpu,
+ pwrc_ee_get_power, 11, 2),
+ [PWRC_G12A_ETH_ID] = MEM_PD("ETH", g12a_pwrc_mem_eth),
+};
+
+static struct meson_ee_pwrc_domain_desc sm1_pwrc_domains[] = {
+ [PWRC_SM1_VPU_ID] = VPU_PD("VPU", &sm1_pwrc_vpu, sm1_pwrc_mem_vpu,
+ pwrc_ee_get_power, 11, 2),
+ [PWRC_SM1_NNA_ID] = TOP_PD("NNA", &sm1_pwrc_nna, sm1_pwrc_mem_nna,
+ pwrc_ee_get_power),
+ [PWRC_SM1_USB_ID] = TOP_PD("USB", &sm1_pwrc_usb, sm1_pwrc_mem_usb,
+ pwrc_ee_get_power),
+ [PWRC_SM1_PCIE_ID] = TOP_PD("PCI", &sm1_pwrc_pci, sm1_pwrc_mem_pcie,
+ pwrc_ee_get_power),
+ [PWRC_SM1_GE2D_ID] = TOP_PD("GE2D", &sm1_pwrc_ge2d, sm1_pwrc_mem_ge2d,
+ pwrc_ee_get_power),
+ [PWRC_SM1_AUDIO_ID] = MEM_PD("AUDIO", sm1_pwrc_mem_audio),
+ [PWRC_SM1_ETH_ID] = MEM_PD("ETH", g12a_pwrc_mem_eth),
+};
+
+struct meson_ee_pwrc_domain {
+ struct generic_pm_domain base;
+ bool enabled;
+ struct meson_ee_pwrc *pwrc;
+ struct meson_ee_pwrc_domain_desc desc;
+ struct clk_bulk_data *clks;
+ int num_clks;
+ struct reset_control *rstc;
+ int num_rstc;
+};
+
+struct meson_ee_pwrc {
+ struct regmap *regmap_ao;
+ struct regmap *regmap_hhi;
+ struct meson_ee_pwrc_domain *domains;
+ struct genpd_onecell_data xlate;
+};
+
+static bool pwrc_ee_get_power(struct meson_ee_pwrc_domain *pwrc_domain)
+{
+ u32 reg;
+
+ regmap_read(pwrc_domain->pwrc->regmap_ao,
+ pwrc_domain->desc.top_pd->sleep_reg, &reg);
+
+ return (reg & pwrc_domain->desc.top_pd->sleep_mask);
+}
+
+static int meson_ee_pwrc_off(struct generic_pm_domain *domain)
+{
+ struct meson_ee_pwrc_domain *pwrc_domain =
+ container_of(domain, struct meson_ee_pwrc_domain, base);
+ int i;
+
+ if (pwrc_domain->desc.top_pd)
+ regmap_update_bits(pwrc_domain->pwrc->regmap_ao,
+ pwrc_domain->desc.top_pd->sleep_reg,
+ pwrc_domain->desc.top_pd->sleep_mask,
+ pwrc_domain->desc.top_pd->sleep_mask);
+ udelay(20);
+
+ for (i = 0 ; i < pwrc_domain->desc.mem_pd_count ; ++i)
+ regmap_update_bits(pwrc_domain->pwrc->regmap_hhi,
+ pwrc_domain->desc.mem_pd[i].reg,
+ pwrc_domain->desc.mem_pd[i].mask,
+ pwrc_domain->desc.mem_pd[i].mask);
+
+ udelay(20);
+
+ if (pwrc_domain->desc.top_pd)
+ regmap_update_bits(pwrc_domain->pwrc->regmap_ao,
+ pwrc_domain->desc.top_pd->iso_reg,
+ pwrc_domain->desc.top_pd->iso_mask,
+ pwrc_domain->desc.top_pd->iso_mask);
+
+ if (pwrc_domain->num_clks) {
+ msleep(20);
+ clk_bulk_disable_unprepare(pwrc_domain->num_clks,
+ pwrc_domain->clks);
+ }
+
+ return 0;
+}
+
+static int meson_ee_pwrc_on(struct generic_pm_domain *domain)
+{
+ struct meson_ee_pwrc_domain *pwrc_domain =
+ container_of(domain, struct meson_ee_pwrc_domain, base);
+ int i, ret;
+
+ if (pwrc_domain->desc.top_pd)
+ regmap_update_bits(pwrc_domain->pwrc->regmap_ao,
+ pwrc_domain->desc.top_pd->sleep_reg,
+ pwrc_domain->desc.top_pd->sleep_mask, 0);
+ udelay(20);
+
+ for (i = 0 ; i < pwrc_domain->desc.mem_pd_count ; ++i)
+ regmap_update_bits(pwrc_domain->pwrc->regmap_hhi,
+ pwrc_domain->desc.mem_pd[i].reg,
+ pwrc_domain->desc.mem_pd[i].mask, 0);
+
+ udelay(20);
+
+ ret = reset_control_assert(pwrc_domain->rstc);
+ if (ret)
+ return ret;
+
+ if (pwrc_domain->desc.top_pd)
+ regmap_update_bits(pwrc_domain->pwrc->regmap_ao,
+ pwrc_domain->desc.top_pd->iso_reg,
+ pwrc_domain->desc.top_pd->iso_mask, 0);
+
+ ret = reset_control_deassert(pwrc_domain->rstc);
+ if (ret)
+ return ret;
+
+ return clk_bulk_prepare_enable(pwrc_domain->num_clks,
+ pwrc_domain->clks);
+}
+
+static int meson_ee_pwrc_init_domain(struct platform_device *pdev,
+ struct meson_ee_pwrc *pwrc,
+ struct meson_ee_pwrc_domain *dom)
+{
+ dom->pwrc = pwrc;
+ dom->num_rstc = dom->desc.reset_names_count;
+ dom->num_clks = dom->desc.clk_names_count;
+
+ if (dom->num_rstc) {
+ int count = reset_control_get_count(&pdev->dev);
+
+ if (count != dom->num_rstc)
+ dev_warn(&pdev->dev, "Invalid resets count %d for domain %s\n",
+ count, dom->desc.name);
+
+ dom->rstc = devm_reset_control_array_get(&pdev->dev, false,
+ false);
+ if (IS_ERR(dom->rstc))
+ return PTR_ERR(dom->rstc);
+ }
+
+ if (dom->num_clks) {
+ int ret = devm_clk_bulk_get_all(&pdev->dev, &dom->clks);
+ if (ret < 0)
+ return ret;
+
+ if (dom->num_clks != ret) {
+ dev_warn(&pdev->dev, "Invalid clocks count %d for domain %s\n",
+ ret, dom->desc.name);
+ dom->num_clks = ret;
+ }
+ }
+
+ dom->base.name = dom->desc.name;
+ dom->base.power_on = meson_ee_pwrc_on;
+ dom->base.power_off = meson_ee_pwrc_off;
+
+ /*
+ * TOFIX: This is a special case for the VPU power domain, which can
+ * be enabled previously by the bootloader. In this case the VPU
+ * pipeline may be functional but no driver maybe never attach
+ * to this power domain, and if the domain is disabled it could
+ * cause system errors. This is why the pm_domain_always_on_gov
+ * is used here.
+ * For the same reason, the clocks should be enabled in case
+ * we need to power the domain off, otherwise the internal clocks
+ * prepare/enable counters won't be in sync.
+ */
+ if (dom->num_clks && dom->desc.get_power && !dom->desc.get_power(dom)) {
+ int ret = clk_bulk_prepare_enable(dom->num_clks, dom->clks);
+ if (ret)
+ return ret;
+
+ pm_genpd_init(&dom->base, &pm_domain_always_on_gov, false);
+ } else
+ pm_genpd_init(&dom->base, NULL,
+ (dom->desc.get_power ?
+ dom->desc.get_power(dom) : true));
+
+ return 0;
+}
+
+static int meson_ee_pwrc_probe(struct platform_device *pdev)
+{
+ const struct meson_ee_pwrc_domain_data *match;
+ struct regmap *regmap_ao, *regmap_hhi;
+ struct meson_ee_pwrc *pwrc;
+ int i, ret;
+
+ match = of_device_get_match_data(&pdev->dev);
+ if (!match) {
+ dev_err(&pdev->dev, "failed to get match data\n");
+ return -ENODEV;
+ }
+
+ pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
+ if (!pwrc)
+ return -ENOMEM;
+
+ pwrc->xlate.domains = devm_kcalloc(&pdev->dev, match->count,
+ sizeof(*pwrc->xlate.domains),
+ GFP_KERNEL);
+ if (!pwrc->xlate.domains)
+ return -ENOMEM;
+
+ pwrc->domains = devm_kcalloc(&pdev->dev, match->count,
+ sizeof(*pwrc->domains), GFP_KERNEL);
+ if (!pwrc->domains)
+ return -ENOMEM;
+
+ pwrc->xlate.num_domains = match->count;
+
+ regmap_hhi = syscon_node_to_regmap(of_get_parent(pdev->dev.of_node));
+ if (IS_ERR(regmap_hhi)) {
+ dev_err(&pdev->dev, "failed to get HHI regmap\n");
+ return PTR_ERR(regmap_hhi);
+ }
+
+ regmap_ao = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+ "amlogic,ao-sysctrl");
+ if (IS_ERR(regmap_ao)) {
+ dev_err(&pdev->dev, "failed to get AO regmap\n");
+ return PTR_ERR(regmap_ao);
+ }
+
+ pwrc->regmap_ao = regmap_ao;
+ pwrc->regmap_hhi = regmap_hhi;
+
+ platform_set_drvdata(pdev, pwrc);
+
+ for (i = 0 ; i < match->count ; ++i) {
+ struct meson_ee_pwrc_domain *dom = &pwrc->domains[i];
+
+ memcpy(&dom->desc, &match->domains[i], sizeof(dom->desc));
+
+ ret = meson_ee_pwrc_init_domain(pdev, pwrc, dom);
+ if (ret)
+ return ret;
+
+ pwrc->xlate.domains[i] = &dom->base;
+ }
+
+ of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
+
+ return 0;
+}
+
+static void meson_ee_pwrc_shutdown(struct platform_device *pdev)
+{
+ struct meson_ee_pwrc *pwrc = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0 ; i < pwrc->xlate.num_domains ; ++i) {
+ struct meson_ee_pwrc_domain *dom = &pwrc->domains[i];
+
+ if (dom->desc.get_power && !dom->desc.get_power(dom))
+ meson_ee_pwrc_off(&dom->base);
+ }
+}
+
+static struct meson_ee_pwrc_domain_data meson_ee_g12a_pwrc_data = {
+ .count = ARRAY_SIZE(g12a_pwrc_domains),
+ .domains = g12a_pwrc_domains,
+};
+
+static struct meson_ee_pwrc_domain_data meson_ee_sm1_pwrc_data = {
+ .count = ARRAY_SIZE(sm1_pwrc_domains),
+ .domains = sm1_pwrc_domains,
+};
+
+static const struct of_device_id meson_ee_pwrc_match_table[] = {
+ {
+ .compatible = "amlogic,meson-g12a-pwrc",
+ .data = &meson_ee_g12a_pwrc_data,
+ },
+ {
+ .compatible = "amlogic,meson-sm1-pwrc",
+ .data = &meson_ee_sm1_pwrc_data,
+ },
+ { /* sentinel */ }
+};
+
+static struct platform_driver meson_ee_pwrc_driver = {
+ .probe = meson_ee_pwrc_probe,
+ .shutdown = meson_ee_pwrc_shutdown,
+ .driver = {
+ .name = "meson_ee_pwrc",
+ .of_match_table = meson_ee_pwrc_match_table,
+ },
+};
+builtin_platform_driver(meson_ee_pwrc_driver);
--
2.22.0
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