![Jun Nie](/assets/img/avatar_default.png)
Add power domains for ZX296702 to power off inactive power domains in runtime. Signed-off-by: Jun Nie <jun.nie@linaro.org> [olof: Marked zx296702_pd_driver as __initdata to avoid section mismatch] Signed-off-by: Olof Johansson <olof@lixom.net>
203 lines
4.5 KiB
C
203 lines
4.5 KiB
C
/*
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* Copyright (C) 2015 Linaro Ltd.
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*
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* Author: Jun Nie <jun.nie@linaro.org>
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* License terms: GNU General Public License (GPL) version 2
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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 (!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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