+++ /dev/null
-/*
- * Copyright (c) 2017 BayLibre, SAS
- * Author: Neil Armstrong <narmstrong@baylibre.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-#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.h>
-#include <linux/reset.h>
-#include <linux/clk.h>
-#include <linux/module.h>
-
-/* AO Offsets */
-
-#define AO_RTI_GEN_PWR_SLEEP0 (0x3a << 2)
-
-#define GEN_PWR_VPU_HDMI BIT(8)
-#define GEN_PWR_VPU_HDMI_ISO BIT(9)
-
-/* 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_REG2 (0x4d << 2)
-
-struct meson_gx_pwrc_vpu {
- struct generic_pm_domain genpd;
- struct regmap *regmap_ao;
- struct regmap *regmap_hhi;
- struct reset_control *rstc;
- struct clk *vpu_clk;
- struct clk *vapb_clk;
-};
-
-static inline
-struct meson_gx_pwrc_vpu *genpd_to_pd(struct generic_pm_domain *d)
-{
- return container_of(d, struct meson_gx_pwrc_vpu, genpd);
-}
-
-static int meson_gx_pwrc_vpu_power_off(struct generic_pm_domain *genpd)
-{
- struct meson_gx_pwrc_vpu *pd = genpd_to_pd(genpd);
- int i;
-
- regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
- GEN_PWR_VPU_HDMI_ISO, GEN_PWR_VPU_HDMI_ISO);
- udelay(20);
-
- /* Power Down Memories */
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG0,
- 0x3 << i, 0x3 << i);
- udelay(5);
- }
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG1,
- 0x3 << i, 0x3 << i);
- udelay(5);
- }
- for (i = 8; i < 16; i++) {
- regmap_update_bits(pd->regmap_hhi, HHI_MEM_PD_REG0,
- BIT(i), BIT(i));
- udelay(5);
- }
- udelay(20);
-
- regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
- GEN_PWR_VPU_HDMI, GEN_PWR_VPU_HDMI);
-
- msleep(20);
-
- clk_disable_unprepare(pd->vpu_clk);
- clk_disable_unprepare(pd->vapb_clk);
-
- return 0;
-}
-
-static int meson_g12a_pwrc_vpu_power_off(struct generic_pm_domain *genpd)
-{
- struct meson_gx_pwrc_vpu *pd = genpd_to_pd(genpd);
- int i;
-
- regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
- GEN_PWR_VPU_HDMI_ISO, GEN_PWR_VPU_HDMI_ISO);
- udelay(20);
-
- /* Power Down Memories */
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG0,
- 0x3 << i, 0x3 << i);
- udelay(5);
- }
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG1,
- 0x3 << i, 0x3 << i);
- udelay(5);
- }
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG2,
- 0x3 << i, 0x3 << i);
- udelay(5);
- }
- for (i = 8; i < 16; i++) {
- regmap_update_bits(pd->regmap_hhi, HHI_MEM_PD_REG0,
- BIT(i), BIT(i));
- udelay(5);
- }
- udelay(20);
-
- regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
- GEN_PWR_VPU_HDMI, GEN_PWR_VPU_HDMI);
-
- msleep(20);
-
- clk_disable_unprepare(pd->vpu_clk);
- clk_disable_unprepare(pd->vapb_clk);
-
- return 0;
-}
-
-static int meson_gx_pwrc_vpu_setup_clk(struct meson_gx_pwrc_vpu *pd)
-{
- int ret;
-
- ret = clk_prepare_enable(pd->vpu_clk);
- if (ret)
- return ret;
-
- ret = clk_prepare_enable(pd->vapb_clk);
- if (ret)
- clk_disable_unprepare(pd->vpu_clk);
-
- return ret;
-}
-
-static int meson_gx_pwrc_vpu_power_on(struct generic_pm_domain *genpd)
-{
- struct meson_gx_pwrc_vpu *pd = genpd_to_pd(genpd);
- int ret;
- int i;
-
- regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
- GEN_PWR_VPU_HDMI, 0);
- udelay(20);
-
- /* Power Up Memories */
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG0,
- 0x3 << i, 0);
- udelay(5);
- }
-
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG1,
- 0x3 << i, 0);
- udelay(5);
- }
-
- for (i = 8; i < 16; i++) {
- regmap_update_bits(pd->regmap_hhi, HHI_MEM_PD_REG0,
- BIT(i), 0);
- udelay(5);
- }
- udelay(20);
-
- ret = reset_control_assert(pd->rstc);
- if (ret)
- return ret;
-
- regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
- GEN_PWR_VPU_HDMI_ISO, 0);
-
- ret = reset_control_deassert(pd->rstc);
- if (ret)
- return ret;
-
- ret = meson_gx_pwrc_vpu_setup_clk(pd);
- if (ret)
- return ret;
-
- return 0;
-}
-
-static int meson_g12a_pwrc_vpu_power_on(struct generic_pm_domain *genpd)
-{
- struct meson_gx_pwrc_vpu *pd = genpd_to_pd(genpd);
- int ret;
- int i;
-
- regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
- GEN_PWR_VPU_HDMI, 0);
- udelay(20);
-
- /* Power Up Memories */
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG0,
- 0x3 << i, 0);
- udelay(5);
- }
-
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG1,
- 0x3 << i, 0);
- udelay(5);
- }
-
- for (i = 0; i < 32; i += 2) {
- regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG2,
- 0x3 << i, 0);
- udelay(5);
- }
-
- for (i = 8; i < 16; i++) {
- regmap_update_bits(pd->regmap_hhi, HHI_MEM_PD_REG0,
- BIT(i), 0);
- udelay(5);
- }
- udelay(20);
-
- ret = reset_control_assert(pd->rstc);
- if (ret)
- return ret;
-
- regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
- GEN_PWR_VPU_HDMI_ISO, 0);
-
- ret = reset_control_deassert(pd->rstc);
- if (ret)
- return ret;
-
- ret = meson_gx_pwrc_vpu_setup_clk(pd);
- if (ret)
- return ret;
-
- return 0;
-}
-
-static bool meson_gx_pwrc_vpu_get_power(struct meson_gx_pwrc_vpu *pd)
-{
- u32 reg;
-
- regmap_read(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0, ®);
-
- return (reg & GEN_PWR_VPU_HDMI);
-}
-
-static struct meson_gx_pwrc_vpu vpu_hdmi_pd = {
- .genpd = {
- .name = "vpu_hdmi",
- .power_off = meson_gx_pwrc_vpu_power_off,
- .power_on = meson_gx_pwrc_vpu_power_on,
- },
-};
-
-static struct meson_gx_pwrc_vpu vpu_hdmi_pd_g12a = {
- .genpd = {
- .name = "vpu_hdmi",
- .power_off = meson_g12a_pwrc_vpu_power_off,
- .power_on = meson_g12a_pwrc_vpu_power_on,
- },
-};
-
-static int meson_gx_pwrc_vpu_probe(struct platform_device *pdev)
-{
- const struct meson_gx_pwrc_vpu *vpu_pd_match;
- struct regmap *regmap_ao, *regmap_hhi;
- struct meson_gx_pwrc_vpu *vpu_pd;
- struct device_node *parent_np;
- struct reset_control *rstc;
- struct clk *vpu_clk;
- struct clk *vapb_clk;
- bool powered_off;
- int ret;
-
- vpu_pd_match = of_device_get_match_data(&pdev->dev);
- if (!vpu_pd_match) {
- dev_err(&pdev->dev, "failed to get match data\n");
- return -ENODEV;
- }
-
- vpu_pd = devm_kzalloc(&pdev->dev, sizeof(*vpu_pd), GFP_KERNEL);
- if (!vpu_pd)
- return -ENOMEM;
-
- memcpy(vpu_pd, vpu_pd_match, sizeof(*vpu_pd));
-
- parent_np = of_get_parent(pdev->dev.of_node);
- regmap_ao = syscon_node_to_regmap(parent_np);
- of_node_put(parent_np);
- if (IS_ERR(regmap_ao)) {
- dev_err(&pdev->dev, "failed to get regmap\n");
- return PTR_ERR(regmap_ao);
- }
-
- regmap_hhi = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
- "amlogic,hhi-sysctrl");
- if (IS_ERR(regmap_hhi)) {
- dev_err(&pdev->dev, "failed to get HHI regmap\n");
- return PTR_ERR(regmap_hhi);
- }
-
- rstc = devm_reset_control_array_get_exclusive(&pdev->dev);
- if (IS_ERR(rstc))
- return dev_err_probe(&pdev->dev, PTR_ERR(rstc),
- "failed to get reset lines\n");
-
- vpu_clk = devm_clk_get(&pdev->dev, "vpu");
- if (IS_ERR(vpu_clk)) {
- dev_err(&pdev->dev, "vpu clock request failed\n");
- return PTR_ERR(vpu_clk);
- }
-
- vapb_clk = devm_clk_get(&pdev->dev, "vapb");
- if (IS_ERR(vapb_clk)) {
- dev_err(&pdev->dev, "vapb clock request failed\n");
- return PTR_ERR(vapb_clk);
- }
-
- vpu_pd->regmap_ao = regmap_ao;
- vpu_pd->regmap_hhi = regmap_hhi;
- vpu_pd->rstc = rstc;
- vpu_pd->vpu_clk = vpu_clk;
- vpu_pd->vapb_clk = vapb_clk;
-
- platform_set_drvdata(pdev, vpu_pd);
-
- powered_off = meson_gx_pwrc_vpu_get_power(vpu_pd);
-
- /* If already powered, sync the clock states */
- if (!powered_off) {
- ret = meson_gx_pwrc_vpu_setup_clk(vpu_pd);
- if (ret)
- return ret;
- }
-
- vpu_pd->genpd.flags = GENPD_FLAG_ALWAYS_ON;
- pm_genpd_init(&vpu_pd->genpd, NULL, powered_off);
-
- return of_genpd_add_provider_simple(pdev->dev.of_node,
- &vpu_pd->genpd);
-}
-
-static void meson_gx_pwrc_vpu_shutdown(struct platform_device *pdev)
-{
- struct meson_gx_pwrc_vpu *vpu_pd = platform_get_drvdata(pdev);
- bool powered_off;
-
- powered_off = meson_gx_pwrc_vpu_get_power(vpu_pd);
- if (!powered_off)
- vpu_pd->genpd.power_off(&vpu_pd->genpd);
-}
-
-static const struct of_device_id meson_gx_pwrc_vpu_match_table[] = {
- { .compatible = "amlogic,meson-gx-pwrc-vpu", .data = &vpu_hdmi_pd },
- {
- .compatible = "amlogic,meson-g12a-pwrc-vpu",
- .data = &vpu_hdmi_pd_g12a
- },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, meson_gx_pwrc_vpu_match_table);
-
-static struct platform_driver meson_gx_pwrc_vpu_driver = {
- .probe = meson_gx_pwrc_vpu_probe,
- .shutdown = meson_gx_pwrc_vpu_shutdown,
- .driver = {
- .name = "meson_gx_pwrc_vpu",
- .of_match_table = meson_gx_pwrc_vpu_match_table,
- },
-};
-module_platform_driver(meson_gx_pwrc_vpu_driver);
-MODULE_DESCRIPTION("Amlogic Meson GX Power Domains driver");
-MODULE_LICENSE("GPL v2");
projects / thirdparty / kernel / linux.git / commitdiff
