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202 lines
4.5 KiB
202 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2015 Linaro Ltd. |
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* |
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* Author: Jun Nie <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_domain.h> |
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#include <linux/slab.h> |
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#define PCU_DM_CLKEN 0x18 |
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#define PCU_DM_RSTEN 0x1C |
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#define PCU_DM_ISOEN 0x20 |
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#define PCU_DM_PWRDN 0x24 |
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#define PCU_DM_ACK_SYNC 0x28 |
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enum { |
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PCU_DM_NEON0 = 0, |
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PCU_DM_NEON1, |
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PCU_DM_GPU, |
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PCU_DM_DECPPU, |
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PCU_DM_VOU, |
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PCU_DM_R2D, |
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PCU_DM_TOP, |
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}; |
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static void __iomem *pcubase; |
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struct zx_pm_domain { |
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struct generic_pm_domain dm; |
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unsigned int bit; |
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}; |
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static int normal_power_off(struct generic_pm_domain *domain) |
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{ |
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struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain; |
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unsigned long loop = 1000; |
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u32 tmp; |
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tmp = readl_relaxed(pcubase + PCU_DM_CLKEN); |
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tmp &= ~BIT(zpd->bit); |
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writel_relaxed(tmp, pcubase + PCU_DM_CLKEN); |
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udelay(5); |
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tmp = readl_relaxed(pcubase + PCU_DM_ISOEN); |
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tmp &= ~BIT(zpd->bit); |
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writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_ISOEN); |
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udelay(5); |
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tmp = readl_relaxed(pcubase + PCU_DM_RSTEN); |
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tmp &= ~BIT(zpd->bit); |
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writel_relaxed(tmp, pcubase + PCU_DM_RSTEN); |
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udelay(5); |
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tmp = readl_relaxed(pcubase + PCU_DM_PWRDN); |
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tmp &= ~BIT(zpd->bit); |
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writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_PWRDN); |
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do { |
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tmp = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit); |
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} while (--loop && !tmp); |
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if (!loop) { |
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pr_err("Error: %s %s fail\n", __func__, domain->name); |
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return -EIO; |
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} |
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return 0; |
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} |
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static int normal_power_on(struct generic_pm_domain *domain) |
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{ |
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struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain; |
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unsigned long loop = 10000; |
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u32 tmp; |
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tmp = readl_relaxed(pcubase + PCU_DM_PWRDN); |
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tmp &= ~BIT(zpd->bit); |
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writel_relaxed(tmp, pcubase + PCU_DM_PWRDN); |
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do { |
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tmp = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit); |
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} while (--loop && tmp); |
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if (!loop) { |
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pr_err("Error: %s %s fail\n", __func__, domain->name); |
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return -EIO; |
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} |
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tmp = readl_relaxed(pcubase + PCU_DM_RSTEN); |
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tmp &= ~BIT(zpd->bit); |
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writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_RSTEN); |
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udelay(5); |
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tmp = readl_relaxed(pcubase + PCU_DM_ISOEN); |
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tmp &= ~BIT(zpd->bit); |
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writel_relaxed(tmp, pcubase + PCU_DM_ISOEN); |
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udelay(5); |
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tmp = readl_relaxed(pcubase + PCU_DM_CLKEN); |
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tmp &= ~BIT(zpd->bit); |
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writel_relaxed(tmp | BIT(zpd->bit), pcubase + PCU_DM_CLKEN); |
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udelay(5); |
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return 0; |
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} |
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static struct zx_pm_domain gpu_domain = { |
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.dm = { |
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.name = "gpu_domain", |
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.power_off = normal_power_off, |
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.power_on = normal_power_on, |
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}, |
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.bit = PCU_DM_GPU, |
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}; |
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static struct zx_pm_domain decppu_domain = { |
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.dm = { |
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.name = "decppu_domain", |
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.power_off = normal_power_off, |
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.power_on = normal_power_on, |
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}, |
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.bit = PCU_DM_DECPPU, |
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}; |
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static struct zx_pm_domain vou_domain = { |
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.dm = { |
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.name = "vou_domain", |
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.power_off = normal_power_off, |
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.power_on = normal_power_on, |
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}, |
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.bit = PCU_DM_VOU, |
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}; |
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static struct zx_pm_domain r2d_domain = { |
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.dm = { |
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.name = "r2d_domain", |
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.power_off = normal_power_off, |
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.power_on = normal_power_on, |
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}, |
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.bit = PCU_DM_R2D, |
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}; |
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static struct generic_pm_domain *zx296702_pm_domains[] = { |
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&vou_domain.dm, |
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&gpu_domain.dm, |
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&decppu_domain.dm, |
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&r2d_domain.dm, |
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}; |
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static int zx296702_pd_probe(struct platform_device *pdev) |
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{ |
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struct genpd_onecell_data *genpd_data; |
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struct resource *res; |
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int i; |
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genpd_data = devm_kzalloc(&pdev->dev, sizeof(*genpd_data), GFP_KERNEL); |
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if (!genpd_data) |
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return -ENOMEM; |
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genpd_data->domains = zx296702_pm_domains; |
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genpd_data->num_domains = ARRAY_SIZE(zx296702_pm_domains); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) { |
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dev_err(&pdev->dev, "no memory resource defined\n"); |
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return -ENODEV; |
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} |
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pcubase = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(pcubase)) { |
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dev_err(&pdev->dev, "ioremap fail.\n"); |
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return -EIO; |
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} |
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for (i = 0; i < ARRAY_SIZE(zx296702_pm_domains); ++i) |
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pm_genpd_init(zx296702_pm_domains[i], NULL, false); |
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of_genpd_add_provider_onecell(pdev->dev.of_node, genpd_data); |
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return 0; |
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} |
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static const struct of_device_id zx296702_pm_domain_matches[] __initconst = { |
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{ .compatible = "zte,zx296702-pcu", }, |
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{ }, |
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}; |
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static struct platform_driver zx296702_pd_driver __initdata = { |
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.driver = { |
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.name = "zx-powerdomain", |
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.owner = THIS_MODULE, |
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.of_match_table = zx296702_pm_domain_matches, |
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}, |
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.probe = zx296702_pd_probe, |
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}; |
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static int __init zx296702_pd_init(void) |
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{ |
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return platform_driver_register(&zx296702_pd_driver); |
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} |
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subsys_initcall(zx296702_pd_init);
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