142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017 ZTE Ltd.
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*
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* Author: Baoyou Xie <baoyou.xie@linaro.org>
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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 "zx2967_pm_domains.h"
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#define PCU_DM_CLKEN(zpd) ((zpd)->reg_offset[REG_CLKEN])
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#define PCU_DM_ISOEN(zpd) ((zpd)->reg_offset[REG_ISOEN])
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#define PCU_DM_RSTEN(zpd) ((zpd)->reg_offset[REG_RSTEN])
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#define PCU_DM_PWREN(zpd) ((zpd)->reg_offset[REG_PWREN])
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#define PCU_DM_ACK_SYNC(zpd) ((zpd)->reg_offset[REG_ACK_SYNC])
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static void __iomem *pcubase;
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static int zx2967_power_on(struct generic_pm_domain *domain)
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{
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struct zx2967_pm_domain *zpd = (struct zx2967_pm_domain *)domain;
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unsigned long loop = 1000;
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u32 val;
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val = readl_relaxed(pcubase + PCU_DM_PWREN(zpd));
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if (zpd->polarity == PWREN)
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val |= BIT(zpd->bit);
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else
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val &= ~BIT(zpd->bit);
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writel_relaxed(val, pcubase + PCU_DM_PWREN(zpd));
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do {
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udelay(1);
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val = readl_relaxed(pcubase + PCU_DM_ACK_SYNC(zpd))
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& BIT(zpd->bit);
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} while (--loop && !val);
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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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val = readl_relaxed(pcubase + PCU_DM_RSTEN(zpd));
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val |= BIT(zpd->bit);
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writel_relaxed(val, pcubase + PCU_DM_RSTEN(zpd));
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udelay(5);
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val = readl_relaxed(pcubase + PCU_DM_ISOEN(zpd));
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val &= ~BIT(zpd->bit);
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writel_relaxed(val, pcubase + PCU_DM_ISOEN(zpd));
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udelay(5);
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val = readl_relaxed(pcubase + PCU_DM_CLKEN(zpd));
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val |= BIT(zpd->bit);
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writel_relaxed(val, pcubase + PCU_DM_CLKEN(zpd));
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udelay(5);
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pr_debug("poweron %s\n", domain->name);
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return 0;
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}
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static int zx2967_power_off(struct generic_pm_domain *domain)
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{
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struct zx2967_pm_domain *zpd = (struct zx2967_pm_domain *)domain;
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unsigned long loop = 1000;
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u32 val;
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val = readl_relaxed(pcubase + PCU_DM_CLKEN(zpd));
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val &= ~BIT(zpd->bit);
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writel_relaxed(val, pcubase + PCU_DM_CLKEN(zpd));
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udelay(5);
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val = readl_relaxed(pcubase + PCU_DM_ISOEN(zpd));
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val |= BIT(zpd->bit);
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writel_relaxed(val, pcubase + PCU_DM_ISOEN(zpd));
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udelay(5);
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val = readl_relaxed(pcubase + PCU_DM_RSTEN(zpd));
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val &= ~BIT(zpd->bit);
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writel_relaxed(val, pcubase + PCU_DM_RSTEN(zpd));
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udelay(5);
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val = readl_relaxed(pcubase + PCU_DM_PWREN(zpd));
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if (zpd->polarity == PWREN)
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val &= ~BIT(zpd->bit);
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else
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val |= BIT(zpd->bit);
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writel_relaxed(val, pcubase + PCU_DM_PWREN(zpd));
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do {
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udelay(1);
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val = readl_relaxed(pcubase + PCU_DM_ACK_SYNC(zpd))
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& BIT(zpd->bit);
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} while (--loop && val);
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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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pr_debug("poweroff %s\n", domain->name);
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return 0;
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}
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int zx2967_pd_probe(struct platform_device *pdev,
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struct generic_pm_domain **zx_pm_domains,
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int domain_num)
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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 = zx_pm_domains;
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genpd_data->num_domains = domain_num;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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pcubase = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(pcubase))
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return PTR_ERR(pcubase);
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for (i = 0; i < domain_num; ++i) {
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zx_pm_domains[i]->power_on = zx2967_power_on;
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zx_pm_domains[i]->power_off = zx2967_power_off;
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pm_genpd_init(zx_pm_domains[i], NULL, false);
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}
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of_genpd_add_provider_onecell(pdev->dev.of_node, genpd_data);
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dev_info(&pdev->dev, "powerdomain init ok\n");
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return 0;
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}
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