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Subject[PATCH 1/2] soc: zte: pm_domains: Prepare for supporting ARMv8 2967 family
Date
The ARMv8 2967 family (296718, 296716 etc) uses different value
for controlling the power domain on/off registers, Choose the
value depending on the compatible.

Multiple domains are prepared for the family, it's privated by
the drivers of boards.

This patch prepares the common functions.

Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
---
MAINTAINERS | 1 +
drivers/soc/Kconfig | 1 +
drivers/soc/Makefile | 1 +
drivers/soc/zte/Kconfig | 13 ++++
drivers/soc/zte/Makefile | 4 ++
drivers/soc/zte/pm_domains.c | 138 +++++++++++++++++++++++++++++++++++++++++++
drivers/soc/zte/pm_domains.h | 29 +++++++++
7 files changed, 187 insertions(+)
create mode 100644 drivers/soc/zte/Kconfig
create mode 100644 drivers/soc/zte/Makefile
create mode 100644 drivers/soc/zte/pm_domains.c
create mode 100644 drivers/soc/zte/pm_domains.h

diff --git a/MAINTAINERS b/MAINTAINERS
index ad199da..8198389 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1979,6 +1979,7 @@ L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
F: arch/arm/mach-zx/
F: drivers/clk/zte/
+F: drivers/soc/zte/
F: Documentation/devicetree/bindings/arm/zte.txt
F: Documentation/devicetree/bindings/clock/zx296702-clk.txt

diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index f31bceb..f09023f 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -11,5 +11,6 @@ source "drivers/soc/tegra/Kconfig"
source "drivers/soc/ti/Kconfig"
source "drivers/soc/ux500/Kconfig"
source "drivers/soc/versatile/Kconfig"
+source "drivers/soc/zte/Kconfig"

endmenu
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 50c23d0..05eae52 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_SOC_TI) += ti/
obj-$(CONFIG_ARCH_U8500) += ux500/
obj-$(CONFIG_PLAT_VERSATILE) += versatile/
+obj-$(CONFIG_ARCH_ZX) += zte/
diff --git a/drivers/soc/zte/Kconfig b/drivers/soc/zte/Kconfig
new file mode 100644
index 0000000..4953c3fa
--- /dev/null
+++ b/drivers/soc/zte/Kconfig
@@ -0,0 +1,13 @@
+#
+# zx SoC drivers
+#
+menuconfig SOC_ZX
+ bool "zx SoC driver support"
+
+if SOC_ZX
+
+config ZX_PM_DOMAINS
+ bool "zx PM domains"
+ depends on PM_GENERIC_DOMAINS
+
+endif
diff --git a/drivers/soc/zte/Makefile b/drivers/soc/zte/Makefile
new file mode 100644
index 0000000..97ac8ea
--- /dev/null
+++ b/drivers/soc/zte/Makefile
@@ -0,0 +1,4 @@
+#
+# zx SOC drivers
+#
+obj-$(CONFIG_ZX_PM_DOMAINS) += pm_domains.o
diff --git a/drivers/soc/zte/pm_domains.c b/drivers/soc/zte/pm_domains.c
new file mode 100644
index 0000000..5792f21
--- /dev/null
+++ b/drivers/soc/zte/pm_domains.c
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2015 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 "pm_domains.h"
+
+#define PCU_DM_CLKEN 0x18
+#define PCU_DM_RSTEN 0x20
+#define PCU_DM_ISOEN 0x1c
+#define PCU_DM_PWREN 0x24
+#define PCU_DM_ACK_SYNC 0x28
+
+static void __iomem *pcubase;
+
+int zx_normal_power_on(struct generic_pm_domain *domain)
+{
+ struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain;
+ unsigned long loop = 20000;
+ u32 val;
+
+ loop = 1000;
+ do {
+ val = readl_relaxed(pcubase + PCU_DM_PWREN);
+ val |= BIT(zpd->bit);
+ writel_relaxed(val, pcubase + PCU_DM_PWREN);
+
+ udelay(1);
+ val = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & 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);
+ val &= ~BIT(zpd->bit);
+ writel_relaxed(val | BIT(zpd->bit), pcubase + PCU_DM_RSTEN);
+ udelay(5);
+
+ val = readl_relaxed(pcubase + PCU_DM_ISOEN);
+ val &= ~BIT(zpd->bit);
+ writel_relaxed(val, pcubase + PCU_DM_ISOEN);
+ udelay(5);
+
+ val = readl_relaxed(pcubase + PCU_DM_CLKEN);
+ val &= ~BIT(zpd->bit);
+ writel_relaxed(val | BIT(zpd->bit), pcubase + PCU_DM_CLKEN);
+ udelay(5);
+
+ pr_info("normal poweron %s\n", domain->name);
+
+ return 0;
+}
+
+int zx_normal_power_off(struct generic_pm_domain *domain)
+{
+ struct zx_pm_domain *zpd = (struct zx_pm_domain *)domain;
+ unsigned long loop = 1000;
+ u32 val;
+
+ val = readl_relaxed(pcubase + PCU_DM_CLKEN);
+ val &= ~BIT(zpd->bit);
+ writel_relaxed(val, pcubase + PCU_DM_CLKEN);
+ udelay(5);
+
+ val = readl_relaxed(pcubase + PCU_DM_ISOEN);
+ val &= ~BIT(zpd->bit);
+ writel_relaxed(val | BIT(zpd->bit), pcubase + PCU_DM_ISOEN);
+ udelay(5);
+
+ val = readl_relaxed(pcubase + PCU_DM_RSTEN);
+ val &= ~BIT(zpd->bit);
+ writel_relaxed(val, pcubase + PCU_DM_RSTEN);
+ udelay(5);
+
+ loop = 1000;
+ do {
+ val = readl_relaxed(pcubase + PCU_DM_PWREN);
+ val &= ~BIT(zpd->bit);
+ writel_relaxed(val, pcubase + PCU_DM_PWREN);
+
+ udelay(1);
+
+ val = readl_relaxed(pcubase + PCU_DM_ACK_SYNC) & BIT(zpd->bit);
+ } while (--loop && val);
+
+ if (!loop) {
+ pr_err("Error: %s %s fail\n", __func__, domain->name);
+ return -EIO;
+ }
+
+ pr_info("normal poweroff %s\n", domain->name);
+
+ return 0;
+}
+
+int
+zx_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);
+ if (!res) {
+ dev_err(&pdev->dev, "no memory resource defined\n");
+ return -ENODEV;
+ }
+
+ pcubase = devm_ioremap_resource(&pdev->dev, res);
+ if (!pcubase) {
+ dev_err(&pdev->dev, "ioremap fail.\n");
+ return -EIO;
+ }
+
+ for (i = 0; i < domain_num; ++i)
+ 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;
+}
diff --git a/drivers/soc/zte/pm_domains.h b/drivers/soc/zte/pm_domains.h
new file mode 100644
index 0000000..613e0be
--- /dev/null
+++ b/drivers/soc/zte/pm_domains.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2015 ZTE Co., Ltd.
+ * http://www.zte.com.cn
+ *
+ * Header for ZTE's Power Domain Driver support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ZTE_PM_DOMAIN_H
+#define __ZTE_PM_DOMAIN_H
+
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+
+struct zx_pm_domain {
+ struct generic_pm_domain dm;
+ unsigned int bit;
+};
+
+extern int zx_normal_power_on(struct generic_pm_domain *domain);
+extern int zx_normal_power_off(struct generic_pm_domain *domain);
+extern int
+zx_pd_probe(struct platform_device *pdev,
+ struct generic_pm_domain **zx_pm_domains,
+ int domain_num);
+#endif /* __ZTE_PM_DOMAIN_H */
--
2.7.4
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