[PATCH 1/2] soc: zte: pm_domains: Prepare for supporting ARMv8 2967 family

[Baoyou Xie <baoyou.xie@linaro.org>]

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