[PATCH V6 2/5] arm: mvebu: Add initial support for power managmement service unit
Gregory CLEMENT
gregory.clement at free-electrons.com
Wed Nov 21 09:59:27 EST 2012
The Armada 370 and Armada XP SOCs have a power management service unit
which is responsible for powering down and waking up CPUs and other
SOC units. This patch adds support for this unit.
Signed-off-by: Yehuda Yitschak <yehuday at marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement at free-electrons.com>
---
.../devicetree/bindings/arm/armada-370-xp-pmsu.txt | 20 ++++++
arch/arm/boot/dts/armada-xp.dtsi | 6 ++
arch/arm/mach-mvebu/Makefile | 2 +-
arch/arm/mach-mvebu/common.h | 1 +
arch/arm/mach-mvebu/pmsu.c | 75 ++++++++++++++++++++
arch/arm/mach-mvebu/pmsu.h | 16 +++++
6 files changed, 119 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/arm/armada-370-xp-pmsu.txt
create mode 100644 arch/arm/mach-mvebu/pmsu.c
create mode 100644 arch/arm/mach-mvebu/pmsu.h
diff --git a/Documentation/devicetree/bindings/arm/armada-370-xp-pmsu.txt b/Documentation/devicetree/bindings/arm/armada-370-xp-pmsu.txt
new file mode 100644
index 0000000..926b4d6
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/armada-370-xp-pmsu.txt
@@ -0,0 +1,20 @@
+Power Management Service Unit(PMSU)
+-----------------------------------
+Available on Marvell SOCs: Armada 370 and Armada XP
+
+Required properties:
+
+- compatible: "marvell,armada-370-xp-pmsu"
+
+- reg: Should contain PMSU registers location and length. First pair
+ for the per-CPU SW Reset Control registers, second pair for the
+ Power Management Service Unit.
+
+Example:
+
+armada-370-xp-pmsu at d0022000 {
+ compatible = "marvell,armada-370-xp-pmsu";
+ reg = <0xd0022100 0x430>,
+ <0xd0020800 0x20>;
+};
+
diff --git a/arch/arm/boot/dts/armada-xp.dtsi b/arch/arm/boot/dts/armada-xp.dtsi
index f51554e..1f95e22 100644
--- a/arch/arm/boot/dts/armada-xp.dtsi
+++ b/arch/arm/boot/dts/armada-xp.dtsi
@@ -27,6 +27,12 @@
<0xd0021870 0x58>;
};
+ armada-370-xp-pmsu at d0022000 {
+ compatible = "marvell,armada-370-xp-pmsu";
+ reg = <0xd0022100 0x430>,
+ <0xd0020800 0x20>;
+ };
+
soc {
serial at d0012200 {
compatible = "ns16550";
diff --git a/arch/arm/mach-mvebu/Makefile b/arch/arm/mach-mvebu/Makefile
index 5ce4b42..2e3ec11 100644
--- a/arch/arm/mach-mvebu/Makefile
+++ b/arch/arm/mach-mvebu/Makefile
@@ -2,4 +2,4 @@ ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/$(src)/include \
-I$(srctree)/arch/arm/plat-orion/include
obj-y += system-controller.o
-obj-$(CONFIG_MACH_ARMADA_370_XP) += armada-370-xp.o irq-armada-370-xp.o addr-map.o coherency.o coherency_ll.o
+obj-$(CONFIG_MACH_ARMADA_370_XP) += armada-370-xp.o irq-armada-370-xp.o addr-map.o coherency.o coherency_ll.o pmsu.o
diff --git a/arch/arm/mach-mvebu/common.h b/arch/arm/mach-mvebu/common.h
index ba6b62a..9285d04 100644
--- a/arch/arm/mach-mvebu/common.h
+++ b/arch/arm/mach-mvebu/common.h
@@ -21,4 +21,5 @@ void armada_370_xp_init_irq(void);
void armada_370_xp_handle_irq(struct pt_regs *regs);
int armada_370_xp_coherency_init(void);
+int armada_370_xp_pmsu_init(void);
#endif
diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
new file mode 100644
index 0000000..3cc4bef
--- /dev/null
+++ b/arch/arm/mach-mvebu/pmsu.c
@@ -0,0 +1,75 @@
+/*
+ * Power Management Service Unit(PMSU) support for Armada 370/XP platforms.
+ *
+ * Copyright (C) 2012 Marvell
+ *
+ * Yehuda Yitschak <yehuday at marvell.com>
+ * Gregory Clement <gregory.clement at free-electrons.com>
+ * Thomas Petazzoni <thomas.petazzoni at 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.
+ *
+ * The Armada 370 and Armada XP SOCs have a power management service
+ * unit which is responsible for powering down and waking up CPUs and
+ * other SOC units
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+#include <linux/smp.h>
+#include <asm/smp_plat.h>
+
+static void __iomem *pmsu_mp_base;
+static void __iomem *pmsu_reset_base;
+
+#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x24)
+#define PMSU_RESET_CTL_OFFSET(cpu) (cpu * 0x8)
+
+static struct of_device_id of_pmsu_table[] = {
+ {.compatible = "marvell,armada-370-xp-pmsu"},
+ { /* end of list */ },
+};
+
+#ifdef CONFIG_SMP
+int armada_xp_boot_cpu(unsigned int cpu_id, void *boot_addr)
+{
+ int reg, hw_cpu;
+
+ if (!pmsu_mp_base || !pmsu_reset_base) {
+ pr_warn("Can't boot CPU. PMSU is uninitialized\n");
+ return 1;
+ }
+
+ hw_cpu = cpu_logical_map(cpu_id);
+
+ writel(virt_to_phys(boot_addr), pmsu_mp_base +
+ PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu));
+
+ /* Release CPU from reset by clearing reset bit*/
+ reg = readl(pmsu_reset_base + PMSU_RESET_CTL_OFFSET(hw_cpu));
+ reg &= (~0x1);
+ writel(reg, pmsu_reset_base + PMSU_RESET_CTL_OFFSET(hw_cpu));
+
+ return 0;
+}
+#endif
+
+int __init armada_370_xp_pmsu_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_matching_node(NULL, of_pmsu_table);
+ if (np) {
+ pr_info("Initializing Power Management Service Unit\n");
+ pmsu_mp_base = of_iomap(np, 0);
+ pmsu_reset_base = of_iomap(np, 1);
+ }
+
+ return 0;
+}
+
+early_initcall(armada_370_xp_pmsu_init);
diff --git a/arch/arm/mach-mvebu/pmsu.h b/arch/arm/mach-mvebu/pmsu.h
new file mode 100644
index 0000000..07a737c
--- /dev/null
+++ b/arch/arm/mach-mvebu/pmsu.h
@@ -0,0 +1,16 @@
+/*
+ * Power Management Service Unit (PMSU) support for Armada 370/XP platforms.
+ *
+ * Copyright (C) 2012 Marvell
+ *
+ * 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.
+ */
+
+#ifndef __MACH_MVEBU_PMSU_H
+#define __MACH_MVEBU_PMSU_H
+
+int armada_xp_boot_cpu(unsigned int cpu_id, void *phys_addr);
+
+#endif /* __MACH_370_XP_PMSU_H */
--
1.7.9.5
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