Merge tag 'mvebu-soc-3.17-4' of git://git.infradead.org/linux-mvebu into next/soc

Merge "mvebu SoC changes for v3.17 (round 4)" from Jason Cooper:

 - Armada XP
    - Fix return value check in pmsu code
    - Document URLs for new public datasheets (Thanks, Marvell & free-electrons!)

 - Armada 370/38x
    - Add cpuidle support

 - mvebu
    - Fix build when no platforms are selected
    - Update EBU SoC status in docs

* tag 'mvebu-soc-3.17-4' of git://git.infradead.org/linux-mvebu: (21 commits)
  Documentation: arm: misc updates to Marvell EBU SoC status
  Documentation: arm: add URLs to public datasheets for the Marvell Armada XP SoC
  ARM: mvebu: fix build without platforms selected
  ARM: mvebu: add cpuidle support for Armada 38x
  ARM: mvebu: add cpuidle support for Armada 370
  cpuidle: mvebu: add Armada 38x support
  cpuidle: mvebu: add Armada 370 support
  cpuidle: mvebu: rename the driver from armada-370-xp to mvebu-v7
  ARM: mvebu: export the SCU address
  ARM: mvebu: make the snoop disabling optional in mvebu_v7_pmsu_idle_prepare()
  ARM: mvebu: use a local variable to store the resume address
  ARM: mvebu: make the cpuidle initialization more generic
  ARM: mvebu: rename the armada_370_xp symbols to mvebu_v7 in pmsu.c
  ARM: mvebu: use the common function for Armada 375 SMP workaround
  ARM: mvebu: add a common function for the boot address work around
  ARM: mvebu: sort the #include of pmsu.c in alphabetic order
  ARM: mvebu: split again armada_370_xp_pmsu_idle_enter() in PMSU code
  ARM: mvebu: fix return value check in armada_xp_pmsu_cpufreq_init()
  clk: mvebu: extend clk-cpu for dynamic frequency scaling
  ARM: mvebu: extend PMSU code to support dynamic frequency scaling
  ...

Conflicts:
	arch/arm/mach-mvebu/Kconfig
	drivers/cpuidle/cpuidle-armada-370-xp.c

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

5 files changed, 232 insertions, 105 deletions

diff --git a/drivers/clk/mvebu/clk-cpu.c b/drivers/clk/mvebu/clk-cpu.c
index 8ebf757d29e2..3821a88077ea 100644
--- a/drivers/clk/mvebu/clk-cpu.c
+++ b/drivers/clk/mvebu/clk-cpu.c
@@ -16,10 +16,19 @@
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/delay.h>
+#include <linux/mvebu-pmsu.h>
+#include <asm/smp_plat.h>
 
-#define SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET    0x0
-#define SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET   0xC
-#define SYS_CTRL_CLK_DIVIDER_MASK	    0x3F
+#define SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET               0x0
+#define   SYS_CTRL_CLK_DIVIDER_CTRL_RESET_ALL          0xff
+#define   SYS_CTRL_CLK_DIVIDER_CTRL_RESET_SHIFT        8
+#define SYS_CTRL_CLK_DIVIDER_CTRL2_OFFSET              0x8
+#define   SYS_CTRL_CLK_DIVIDER_CTRL2_NBCLK_RATIO_SHIFT 16
+#define SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET              0xC
+#define SYS_CTRL_CLK_DIVIDER_MASK                      0x3F
+
+#define PMU_DFS_RATIO_SHIFT 16
+#define PMU_DFS_RATIO_MASK  0x3F
 
 #define MAX_CPU	    4
 struct cpu_clk {
@@ -28,6 +37,7 @@ struct cpu_clk {
 	const char *clk_name;
 	const char *parent_name;
 	void __iomem *reg_base;
+	void __iomem *pmu_dfs;
 };
 
 static struct clk **clks;
@@ -62,8 +72,9 @@ static long clk_cpu_round_rate(struct clk_hw *hwclk, unsigned long rate,
 	return *parent_rate / div;
 }
 
-static int clk_cpu_set_rate(struct clk_hw *hwclk, unsigned long rate,
-			    unsigned long parent_rate)
+static int clk_cpu_off_set_rate(struct clk_hw *hwclk, unsigned long rate,
+				unsigned long parent_rate)
+
 {
 	struct cpu_clk *cpuclk = to_cpu_clk(hwclk);
 	u32 reg, div;
@@ -95,6 +106,58 @@ static int clk_cpu_set_rate(struct clk_hw *hwclk, unsigned long rate,
 	return 0;
 }
 
+static int clk_cpu_on_set_rate(struct clk_hw *hwclk, unsigned long rate,
+			       unsigned long parent_rate)
+{
+	u32 reg;
+	unsigned long fabric_div, target_div, cur_rate;
+	struct cpu_clk *cpuclk = to_cpu_clk(hwclk);
+
+	/*
+	 * PMU DFS registers are not mapped, Device Tree does not
+	 * describes them. We cannot change the frequency dynamically.
+	 */
+	if (!cpuclk->pmu_dfs)
+		return -ENODEV;
+
+	cur_rate = __clk_get_rate(hwclk->clk);
+
+	reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL2_OFFSET);
+	fabric_div = (reg >> SYS_CTRL_CLK_DIVIDER_CTRL2_NBCLK_RATIO_SHIFT) &
+		SYS_CTRL_CLK_DIVIDER_MASK;
+
+	/* Frequency is going up */
+	if (rate == 2 * cur_rate)
+		target_div = fabric_div / 2;
+	/* Frequency is going down */
+	else
+		target_div = fabric_div;
+
+	if (target_div == 0)
+		target_div = 1;
+
+	reg = readl(cpuclk->pmu_dfs);
+	reg &= ~(PMU_DFS_RATIO_MASK << PMU_DFS_RATIO_SHIFT);
+	reg |= (target_div << PMU_DFS_RATIO_SHIFT);
+	writel(reg, cpuclk->pmu_dfs);
+
+	reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
+	reg |= (SYS_CTRL_CLK_DIVIDER_CTRL_RESET_ALL <<
+		SYS_CTRL_CLK_DIVIDER_CTRL_RESET_SHIFT);
+	writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
+
+	return mvebu_pmsu_dfs_request(cpuclk->cpu);
+}
+
+static int clk_cpu_set_rate(struct clk_hw *hwclk, unsigned long rate,
+			    unsigned long parent_rate)
+{
+	if (__clk_is_enabled(hwclk->clk))
+		return clk_cpu_on_set_rate(hwclk, rate, parent_rate);
+	else
+		return clk_cpu_off_set_rate(hwclk, rate, parent_rate);
+}
+
 static const struct clk_ops cpu_ops = {
 	.recalc_rate = clk_cpu_recalc_rate,
 	.round_rate = clk_cpu_round_rate,
@@ -105,6 +168,7 @@ static void __init of_cpu_clk_setup(struct device_node *node)
 {
 	struct cpu_clk *cpuclk;
 	void __iomem *clock_complex_base = of_iomap(node, 0);
+	void __iomem *pmu_dfs_base = of_iomap(node, 1);
 	int ncpus = 0;
 	struct device_node *dn;
 
@@ -114,6 +178,10 @@ static void __init of_cpu_clk_setup(struct device_node *node)
 		return;
 	}
 
+	if (pmu_dfs_base == NULL)
+		pr_warn("%s: pmu-dfs base register not set, dynamic frequency scaling not available\n",
+			__func__);
+
 	for_each_node_by_type(dn, "cpu")
 		ncpus++;
 
@@ -146,6 +214,8 @@ static void __init of_cpu_clk_setup(struct device_node *node)
 		cpuclk[cpu].clk_name = clk_name;
 		cpuclk[cpu].cpu = cpu;
 		cpuclk[cpu].reg_base = clock_complex_base;
+		if (pmu_dfs_base)
+			cpuclk[cpu].pmu_dfs = pmu_dfs_base + 4 * cpu;
 		cpuclk[cpu].hw.init = &init;
 
 		init.name = cpuclk[cpu].clk_name;
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 2f6b33ea6e08..33fc0ff0af1c 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -1,12 +1,6 @@
 #
 # ARM CPU Idle drivers
 #
-config ARM_ARMADA_370_XP_CPUIDLE
-	bool "CPU Idle Driver for Armada 370/XP family processors"
-	depends on ARCH_MVEBU
-	help
-	  Select this to enable cpuidle on Armada 370/XP processors.
-
 config ARM_BIG_LITTLE_CPUIDLE
 	bool "Support for ARM big.LITTLE processors"
 	depends on ARCH_VEXPRESS_TC2_PM || ARCH_EXYNOS
@@ -61,3 +55,9 @@ config ARM_EXYNOS_CPUIDLE
 	depends on ARCH_EXYNOS
 	help
 	  Select this to enable cpuidle for Exynos processors
+
+config ARM_MVEBU_V7_CPUIDLE
+	bool "CPU Idle Driver for mvebu v7 family processors"
+	depends on ARCH_MVEBU
+	help
+	  Select this to enable cpuidle on Armada 370, 38x and XP processors.
diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index d8bb1ff72561..11edb31c55e9 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -7,7 +7,7 @@ obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o
 
 ##################################################################################
 # ARM SoC drivers
-obj-$(CONFIG_ARM_ARMADA_370_XP_CPUIDLE) += cpuidle-armada-370-xp.o
+obj-$(CONFIG_ARM_MVEBU_V7_CPUIDLE) += cpuidle-mvebu-v7.o
 obj-$(CONFIG_ARM_BIG_LITTLE_CPUIDLE)	+= cpuidle-big_little.o
 obj-$(CONFIG_ARM_CLPS711X_CPUIDLE)	+= cpuidle-clps711x.o
 obj-$(CONFIG_ARM_HIGHBANK_CPUIDLE)	+= cpuidle-calxeda.o
diff --git a/drivers/cpuidle/cpuidle-armada-370-xp.c b/drivers/cpuidle/cpuidle-armada-370-xp.c
deleted file mode 100644
index a5fba0287bfb..000000000000
--- a/drivers/cpuidle/cpuidle-armada-370-xp.c
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * Marvell Armada 370 and Armada XP SoC cpuidle driver
- *
- * Copyright (C) 2014 Marvell
- *
- * Nadav Haklai <nadavh@marvell.com>
- * Gregory CLEMENT <gregory.clement@free-electrons.com>
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2.  This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- *
- * Maintainer: Gregory CLEMENT <gregory.clement@free-electrons.com>
- */
-
-#include <linux/cpu_pm.h>
-#include <linux/cpuidle.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/suspend.h>
-#include <linux/platform_device.h>
-#include <asm/cpuidle.h>
-
-#define ARMADA_370_XP_MAX_STATES	3
-#define ARMADA_370_XP_FLAG_DEEP_IDLE	0x10000
-
-static int (*armada_370_xp_cpu_suspend)(int);
-
-static int armada_370_xp_enter_idle(struct cpuidle_device *dev,
-				struct cpuidle_driver *drv,
-				int index)
-{
-	int ret;
-	bool deepidle = false;
-	cpu_pm_enter();
-
-	if (drv->states[index].flags & ARMADA_370_XP_FLAG_DEEP_IDLE)
-		deepidle = true;
-
-	ret = armada_370_xp_cpu_suspend(deepidle);
-	if (ret)
-		return ret;
-
-	cpu_pm_exit();
-
-	return index;
-}
-
-static struct cpuidle_driver armada_370_xp_idle_driver = {
-	.name			= "armada_370_xp_idle",
-	.states[0]		= ARM_CPUIDLE_WFI_STATE,
-	.states[1]		= {
-		.enter			= armada_370_xp_enter_idle,
-		.exit_latency		= 10,
-		.power_usage		= 50,
-		.target_residency	= 100,
-		.flags			= CPUIDLE_FLAG_TIME_VALID,
-		.name			= "Idle",
-		.desc			= "CPU power down",
-	},
-	.states[2]		= {
-		.enter			= armada_370_xp_enter_idle,
-		.exit_latency		= 100,
-		.power_usage		= 5,
-		.target_residency	= 1000,
-		.flags			= CPUIDLE_FLAG_TIME_VALID |
-						ARMADA_370_XP_FLAG_DEEP_IDLE,
-		.name			= "Deep idle",
-		.desc			= "CPU and L2 Fabric power down",
-	},
-	.state_count = ARMADA_370_XP_MAX_STATES,
-};
-
-static int armada_370_xp_cpuidle_probe(struct platform_device *pdev)
-{
-
-	armada_370_xp_cpu_suspend = (void *)(pdev->dev.platform_data);
-	return cpuidle_register(&armada_370_xp_idle_driver, NULL);
-}
-
-static struct platform_driver armada_370_xp_cpuidle_plat_driver = {
-	.driver = {
-		.name = "cpuidle-armada-370-xp",
-		.owner = THIS_MODULE,
-	},
-	.probe = armada_370_xp_cpuidle_probe,
-};
-
-module_platform_driver(armada_370_xp_cpuidle_plat_driver);
-
-MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
-MODULE_DESCRIPTION("Armada 370/XP cpu idle driver");
-MODULE_LICENSE("GPL");
diff --git a/drivers/cpuidle/cpuidle-mvebu-v7.c b/drivers/cpuidle/cpuidle-mvebu-v7.c
new file mode 100644
index 000000000000..45371bb16214
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-mvebu-v7.c
@@ -0,0 +1,150 @@
+/*
+ * Marvell Armada 370, 38x and XP SoC cpuidle driver
+ *
+ * Copyright (C) 2014 Marvell
+ *
+ * Nadav Haklai <nadavh@marvell.com>
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ *
+ * Maintainer: Gregory CLEMENT <gregory.clement@free-electrons.com>
+ */
+
+#include <linux/cpu_pm.h>
+#include <linux/cpuidle.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/suspend.h>
+#include <linux/platform_device.h>
+#include <asm/cpuidle.h>
+
+#define MVEBU_V7_FLAG_DEEP_IDLE	0x10000
+
+static int (*mvebu_v7_cpu_suspend)(int);
+
+static int mvebu_v7_enter_idle(struct cpuidle_device *dev,
+				struct cpuidle_driver *drv,
+				int index)
+{
+	int ret;
+	bool deepidle = false;
+	cpu_pm_enter();
+
+	if (drv->states[index].flags & MVEBU_V7_FLAG_DEEP_IDLE)
+		deepidle = true;
+
+	ret = mvebu_v7_cpu_suspend(deepidle);
+	if (ret)
+		return ret;
+
+	cpu_pm_exit();
+
+	return index;
+}
+
+static struct cpuidle_driver armadaxp_idle_driver = {
+	.name			= "armada_xp_idle",
+	.states[0]		= ARM_CPUIDLE_WFI_STATE,
+	.states[1]		= {
+		.enter			= mvebu_v7_enter_idle,
+		.exit_latency		= 10,
+		.power_usage		= 50,
+		.target_residency	= 100,
+		.flags			= CPUIDLE_FLAG_TIME_VALID,
+		.name			= "MV CPU IDLE",
+		.desc			= "CPU power down",
+	},
+	.states[2]		= {
+		.enter			= mvebu_v7_enter_idle,
+		.exit_latency		= 100,
+		.power_usage		= 5,
+		.target_residency	= 1000,
+		.flags			= CPUIDLE_FLAG_TIME_VALID |
+						MVEBU_V7_FLAG_DEEP_IDLE,
+		.name			= "MV CPU DEEP IDLE",
+		.desc			= "CPU and L2 Fabric power down",
+	},
+	.state_count = 3,
+};
+
+static struct cpuidle_driver armada370_idle_driver = {
+	.name			= "armada_370_idle",
+	.states[0]		= ARM_CPUIDLE_WFI_STATE,
+	.states[1]		= {
+		.enter			= mvebu_v7_enter_idle,
+		.exit_latency		= 100,
+		.power_usage		= 5,
+		.target_residency	= 1000,
+		.flags			= (CPUIDLE_FLAG_TIME_VALID |
+					   MVEBU_V7_FLAG_DEEP_IDLE),
+		.name			= "Deep Idle",
+		.desc			= "CPU and L2 Fabric power down",
+	},
+	.state_count = 2,
+};
+
+static struct cpuidle_driver armada38x_idle_driver = {
+	.name			= "armada_38x_idle",
+	.states[0]		= ARM_CPUIDLE_WFI_STATE,
+	.states[1]		= {
+		.enter			= mvebu_v7_enter_idle,
+		.exit_latency		= 10,
+		.power_usage		= 5,
+		.target_residency	= 100,
+		.flags			= CPUIDLE_FLAG_TIME_VALID,
+		.name			= "Idle",
+		.desc			= "CPU and SCU power down",
+	},
+	.state_count = 2,
+};
+
+static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)
+{
+	mvebu_v7_cpu_suspend = pdev->dev.platform_data;
+
+	if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-xp"))
+		return cpuidle_register(&armadaxp_idle_driver, NULL);
+	else if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-370"))
+		return cpuidle_register(&armada370_idle_driver, NULL);
+	else if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-38x"))
+		return cpuidle_register(&armada38x_idle_driver, NULL);
+	else
+		return -EINVAL;
+}
+
+static struct platform_driver armadaxp_cpuidle_plat_driver = {
+	.driver = {
+		.name = "cpuidle-armada-xp",
+		.owner = THIS_MODULE,
+	},
+	.probe = mvebu_v7_cpuidle_probe,
+};
+
+module_platform_driver(armadaxp_cpuidle_plat_driver);
+
+static struct platform_driver armada370_cpuidle_plat_driver = {
+	.driver = {
+		.name = "cpuidle-armada-370",
+		.owner = THIS_MODULE,
+	},
+	.probe = mvebu_v7_cpuidle_probe,
+};
+
+module_platform_driver(armada370_cpuidle_plat_driver);
+
+static struct platform_driver armada38x_cpuidle_plat_driver = {
+	.driver = {
+		.name = "cpuidle-armada-38x",
+		.owner = THIS_MODULE,
+	},
+	.probe = mvebu_v7_cpuidle_probe,
+};
+
+module_platform_driver(armada38x_cpuidle_plat_driver);
+
+MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
+MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
+MODULE_LICENSE("GPL");