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141 lines
3.4 KiB
141 lines
3.4 KiB
// 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 <[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 "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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