142 lines
3.4 KiB
C
Executable File
142 lines
3.4 KiB
C
Executable File
/*
|
|
* Copyright (C) 2017 ZTE Ltd.
|
|
*
|
|
* Author: Baoyou Xie <baoyou.xie@linaro.org>
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
|
|
#include "zx2967_pm_domains.h"
|
|
|
|
#define PCU_DM_CLKEN(zpd) ((zpd)->reg_offset[REG_CLKEN])
|
|
#define PCU_DM_ISOEN(zpd) ((zpd)->reg_offset[REG_ISOEN])
|
|
#define PCU_DM_RSTEN(zpd) ((zpd)->reg_offset[REG_RSTEN])
|
|
#define PCU_DM_PWREN(zpd) ((zpd)->reg_offset[REG_PWREN])
|
|
#define PCU_DM_ACK_SYNC(zpd) ((zpd)->reg_offset[REG_ACK_SYNC])
|
|
|
|
static void __iomem *pcubase;
|
|
|
|
static int zx2967_power_on(struct generic_pm_domain *domain)
|
|
{
|
|
struct zx2967_pm_domain *zpd = (struct zx2967_pm_domain *)domain;
|
|
unsigned long loop = 1000;
|
|
u32 val;
|
|
|
|
val = readl_relaxed(pcubase + PCU_DM_PWREN(zpd));
|
|
if (zpd->polarity == PWREN)
|
|
val |= BIT(zpd->bit);
|
|
else
|
|
val &= ~BIT(zpd->bit);
|
|
writel_relaxed(val, pcubase + PCU_DM_PWREN(zpd));
|
|
|
|
do {
|
|
udelay(1);
|
|
val = readl_relaxed(pcubase + PCU_DM_ACK_SYNC(zpd))
|
|
& BIT(zpd->bit);
|
|
} while (--loop && !val);
|
|
|
|
if (!loop) {
|
|
pr_err("Error: %s %s fail\n", __func__, domain->name);
|
|
return -EIO;
|
|
}
|
|
|
|
val = readl_relaxed(pcubase + PCU_DM_RSTEN(zpd));
|
|
val |= BIT(zpd->bit);
|
|
writel_relaxed(val, pcubase + PCU_DM_RSTEN(zpd));
|
|
udelay(5);
|
|
|
|
val = readl_relaxed(pcubase + PCU_DM_ISOEN(zpd));
|
|
val &= ~BIT(zpd->bit);
|
|
writel_relaxed(val, pcubase + PCU_DM_ISOEN(zpd));
|
|
udelay(5);
|
|
|
|
val = readl_relaxed(pcubase + PCU_DM_CLKEN(zpd));
|
|
val |= BIT(zpd->bit);
|
|
writel_relaxed(val, pcubase + PCU_DM_CLKEN(zpd));
|
|
udelay(5);
|
|
|
|
pr_debug("poweron %s\n", domain->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int zx2967_power_off(struct generic_pm_domain *domain)
|
|
{
|
|
struct zx2967_pm_domain *zpd = (struct zx2967_pm_domain *)domain;
|
|
unsigned long loop = 1000;
|
|
u32 val;
|
|
|
|
val = readl_relaxed(pcubase + PCU_DM_CLKEN(zpd));
|
|
val &= ~BIT(zpd->bit);
|
|
writel_relaxed(val, pcubase + PCU_DM_CLKEN(zpd));
|
|
udelay(5);
|
|
|
|
val = readl_relaxed(pcubase + PCU_DM_ISOEN(zpd));
|
|
val |= BIT(zpd->bit);
|
|
writel_relaxed(val, pcubase + PCU_DM_ISOEN(zpd));
|
|
udelay(5);
|
|
|
|
val = readl_relaxed(pcubase + PCU_DM_RSTEN(zpd));
|
|
val &= ~BIT(zpd->bit);
|
|
writel_relaxed(val, pcubase + PCU_DM_RSTEN(zpd));
|
|
udelay(5);
|
|
|
|
val = readl_relaxed(pcubase + PCU_DM_PWREN(zpd));
|
|
if (zpd->polarity == PWREN)
|
|
val &= ~BIT(zpd->bit);
|
|
else
|
|
val |= BIT(zpd->bit);
|
|
writel_relaxed(val, pcubase + PCU_DM_PWREN(zpd));
|
|
|
|
do {
|
|
udelay(1);
|
|
val = readl_relaxed(pcubase + PCU_DM_ACK_SYNC(zpd))
|
|
& BIT(zpd->bit);
|
|
} while (--loop && val);
|
|
|
|
if (!loop) {
|
|
pr_err("Error: %s %s fail\n", __func__, domain->name);
|
|
return -EIO;
|
|
}
|
|
|
|
pr_debug("poweroff %s\n", domain->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int zx2967_pd_probe(struct platform_device *pdev,
|
|
struct generic_pm_domain **zx_pm_domains,
|
|
int domain_num)
|
|
{
|
|
struct genpd_onecell_data *genpd_data;
|
|
struct resource *res;
|
|
int i;
|
|
|
|
genpd_data = devm_kzalloc(&pdev->dev, sizeof(*genpd_data), GFP_KERNEL);
|
|
if (!genpd_data)
|
|
return -ENOMEM;
|
|
|
|
genpd_data->domains = zx_pm_domains;
|
|
genpd_data->num_domains = domain_num;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
pcubase = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(pcubase))
|
|
return PTR_ERR(pcubase);
|
|
|
|
for (i = 0; i < domain_num; ++i) {
|
|
zx_pm_domains[i]->power_on = zx2967_power_on;
|
|
zx_pm_domains[i]->power_off = zx2967_power_off;
|
|
|
|
pm_genpd_init(zx_pm_domains[i], NULL, false);
|
|
}
|
|
|
|
of_genpd_add_provider_onecell(pdev->dev.of_node, genpd_data);
|
|
dev_info(&pdev->dev, "powerdomain init ok\n");
|
|
return 0;
|
|
}
|