mvebu SoC suspend changes for v3.19

- Armada 370/XP suspend/resume support
 
  - mvebu SoC driver suspend/resume support
     - irqchip
     - clocksource
     - mbus
     - clk
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Merge tag 'mvebu-soc-suspend-3.19' of git://git.infradead.org/linux-mvebu into next/soc

Pull "mvebu SoC suspend changes for v3.19" from Jason Cooper:

 - Armada 370/XP suspend/resume support

 - mvebu SoC driver suspend/resume support
    - irqchip
    - clocksource
    - mbus
    - clk

* tag 'mvebu-soc-suspend-3.19' of git://git.infradead.org/linux-mvebu:
  ARM: mvebu: add SDRAM controller description for Armada XP
  ARM: mvebu: adjust mbus controller description on Armada 370/XP
  ARM: mvebu: add suspend/resume DT information for Armada XP GP
  ARM: mvebu: synchronize secondary CPU clocks on resume
  ARM: mvebu: make sure MMU is disabled in armada_370_xp_cpu_resume
  ARM: mvebu: Armada XP GP specific suspend/resume code
  ARM: mvebu: reserve the first 10 KB of each memory bank for suspend/resume
  ARM: mvebu: implement suspend/resume support for Armada XP
  clk: mvebu: add suspend/resume for gatable clocks
  bus: mvebu-mbus: provide a mechanism to save SDRAM window configuration
  bus: mvebu-mbus: suspend/resume support
  clocksource: time-armada-370-xp: add suspend/resume support
  irqchip: armada-370-xp: Add suspend/resume support
  Documentation: dt-bindings: minimal documentation for MVEBU SDRAM controller

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

Documentation/devicetree/bindings/bus/mvebu-mbus.txt

@@ -48,9 +48,12 @@ Required properties:
 - compatible:	Should be set to "marvell,mbus-controller".
 
 - reg:          Device's register space.
-		Two entries are expected (see the examples below):
+		Two or three entries are expected (see the examples below):
-		the first one controls the devices decoding window and
+		the first one controls the devices decoding window,
-		the second one controls the SDRAM decoding window.
+		the second one controls the SDRAM decoding window and
+		the third controls the MBus bridge (only with the
+		marvell,armada370-mbus and marvell,armadaxp-mbus
+		compatible strings)
 
 Example:
 
@@ -67,7 +70,7 @@ Example:
 
 			mbusc: mbus-controller@20000 {
 				compatible = "marvell,mbus-controller";
-				reg = <0x20000 0x100>, <0x20180 0x20>;
+				reg = <0x20000 0x100>, <0x20180 0x20>, <0x20250 0x8>;
 			};
 
 			/* more children ...*/
@@ -126,7 +129,7 @@ are skipped.
 
 			mbusc: mbus-controller@20000 {
 				compatible = "marvell,mbus-controller";
-				reg = <0x20000 0x100>, <0x20180 0x20>;
+				reg = <0x20000 0x100>, <0x20180 0x20>, <0x20250 0x8>;
 			};
 
 			/* more children ...*/
@@ -170,7 +173,7 @@ Using this macro, the above example would be:
 
 			mbusc: mbus-controller@20000 {
 				compatible = "marvell,mbus-controller";
-				reg = <0x20000 0x100>, <0x20180 0x20>;
+				reg = <0x20000 0x100>, <0x20180 0x20>, <0x20250 0x8>;
 			};
 
 			/* other children */
@@ -266,7 +269,7 @@ See the example below, where a more complete device tree is shown:
 			ranges = <0 MBUS_ID(0xf0, 0x01) 0 0x100000>;
 
 			mbusc: mbus-controller@20000 {
-				reg = <0x20000 0x100>, <0x20180 0x20>;
+				reg = <0x20000 0x100>, <0x20180 0x20>, <0x20250 0x8>;
 			};
 
 			interrupt-controller@20000 {

Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt

@@ -0,0 +1,21 @@
+Device Tree bindings for MVEBU SDRAM controllers
+
+The Marvell EBU SoCs all have a SDRAM controller. The SDRAM controller
+differs from one SoC variant to another, but they also share a number
+of commonalities.
+
+For now, this Device Tree binding documentation only documents the
+Armada XP SDRAM controller.
+
+Required properties:
+
+ - compatible: for Armada XP, "marvell,armada-xp-sdram-controller"
+ - reg: a resource specifier for the register space, which should
+   include all SDRAM controller registers as per the datasheet.
+
+Example:
+
+sdramc@1400 {
+	compatible = "marvell,armada-xp-sdram-controller";
+	reg = <0x1400 0x500>;
+};

arch/arm/boot/dts/armada-370-xp.dtsi

@@ -180,7 +180,8 @@
 
 			mbusc: mbus-controller@20000 {
 				compatible = "marvell,mbus-controller";
-				reg = <0x20000 0x100>, <0x20180 0x20>;
+				reg = <0x20000 0x100>, <0x20180 0x20>,
+				      <0x20250 0x8>;
 			};
 
 			mpic: interrupt-controller@20000 {

arch/arm/boot/dts/armada-xp-gp.dts

@@ -23,6 +23,7 @@
  */
 
 /dts-v1/;
+#include <dt-bindings/gpio/gpio.h>
 #include "armada-xp-mv78460.dtsi"
 
 / {
@@ -48,6 +49,14 @@
 		      <0x00000001 0x00000000 0x00000001 0x00000000>;
 	};
 
+	cpus {
+		pm_pic {
+			ctrl-gpios = <&gpio0 16 GPIO_ACTIVE_LOW>,
+				     <&gpio0 17 GPIO_ACTIVE_LOW>,
+				     <&gpio0 18 GPIO_ACTIVE_LOW>;
+		};
+	};
+
 	soc {
 		ranges = <MBUS_ID(0xf0, 0x01) 0 0 0xf1000000 0x100000
 			  MBUS_ID(0x01, 0x1d) 0 0 0xfff00000 0x100000
@@ -115,7 +124,15 @@
 			serial@12300 {
 				status = "okay";
 			};
-
+			pinctrl {
+				pinctrl-0 = <&pic_pins>;
+				pinctrl-names = "default";
+				pic_pins: pic-pins-0 {
+					marvell,pins = "mpp16", "mpp17",
+						       "mpp18";
+					marvell,function = "gpio";
+				};
+			};
 			sata@a0000 {
 				nr-ports = <2>;
 				status = "okay";

arch/arm/boot/dts/armada-xp.dtsi

@@ -35,6 +35,11 @@
 		};
 
 		internal-regs {
+			sdramc@1400 {
+				compatible = "marvell,armada-xp-sdram-controller";
+				reg = <0x1400 0x500>;
+			};
+
 			L2: l2-cache {
 				compatible = "marvell,aurora-system-cache";
 				reg = <0x08000 0x1000>;

arch/arm/mach-mvebu/Makefile

@@ -7,7 +7,7 @@ CFLAGS_pmsu.o			:= -march=armv7-a
 obj-$(CONFIG_MACH_MVEBU_ANY)	 += system-controller.o mvebu-soc-id.o
 
 ifeq ($(CONFIG_MACH_MVEBU_V7),y)
-obj-y				 += cpu-reset.o board-v7.o coherency.o coherency_ll.o pmsu.o pmsu_ll.o
+obj-y				 += cpu-reset.o board-v7.o coherency.o coherency_ll.o pmsu.o pmsu_ll.o pm.o pm-board.o
 obj-$(CONFIG_SMP)		 += platsmp.o headsmp.o platsmp-a9.o headsmp-a9.o
 endif
 

arch/arm/mach-mvebu/board-v7.c

@@ -16,10 +16,12 @@
 #include <linux/init.h>
 #include <linux/clk-provider.h>
 #include <linux/of_address.h>
+#include <linux/of_fdt.h>
 #include <linux/of_platform.h>
 #include <linux/io.h>
 #include <linux/clocksource.h>
 #include <linux/dma-mapping.h>
+#include <linux/memblock.h>
 #include <linux/mbus.h>
 #include <linux/signal.h>
 #include <linux/slab.h>
@@ -56,6 +58,54 @@ void __iomem *mvebu_get_scu_base(void)
 	return scu_base;
 }
 
+/*
+ * When returning from suspend, the platform goes through the
+ * bootloader, which executes its DDR3 training code. This code has
+ * the unfortunate idea of using the first 10 KB of each DRAM bank to
+ * exercise the RAM and calculate the optimal timings. Therefore, this
+ * area of RAM is overwritten, and shouldn't be used by the kernel if
+ * suspend/resume is supported.
+ */
+
+#ifdef CONFIG_SUSPEND
+#define MVEBU_DDR_TRAINING_AREA_SZ (10 * SZ_1K)
+static int __init mvebu_scan_mem(unsigned long node, const char *uname,
+				 int depth, void *data)
+{
+	const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
+	const __be32 *reg, *endp;
+	int l;
+
+	if (type == NULL || strcmp(type, "memory"))
+		return 0;
+
+	reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
+	if (reg == NULL)
+		reg = of_get_flat_dt_prop(node, "reg", &l);
+	if (reg == NULL)
+		return 0;
+
+	endp = reg + (l / sizeof(__be32));
+	while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
+		u64 base, size;
+
+		base = dt_mem_next_cell(dt_root_addr_cells, &reg);
+		size = dt_mem_next_cell(dt_root_size_cells, &reg);
+
+		memblock_reserve(base, MVEBU_DDR_TRAINING_AREA_SZ);
+	}
+
+	return 0;
+}
+
+static void __init mvebu_memblock_reserve(void)
+{
+	of_scan_flat_dt(mvebu_scan_mem, NULL);
+}
+#else
+static void __init mvebu_memblock_reserve(void) {}
+#endif
+
 /*
  * Early versions of Armada 375 SoC have a bug where the BootROM
  * leaves an external data abort pending. The kernel is hit by this
@@ -151,6 +201,7 @@ DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
 	.init_machine	= mvebu_dt_init,
 	.init_irq       = mvebu_init_irq,
 	.restart	= mvebu_restart,
+	.reserve        = mvebu_memblock_reserve,
 	.dt_compat	= armada_370_xp_dt_compat,
 MACHINE_END
 

arch/arm/mach-mvebu/common.h

@@ -25,4 +25,6 @@ int mvebu_system_controller_get_soc_id(u32 *dev, u32 *rev);
 
 void __iomem *mvebu_get_scu_base(void);
 
+int mvebu_pm_init(void (*board_pm_enter)(void __iomem *sdram_reg, u32 srcmd));
+
 #endif

arch/arm/mach-mvebu/platsmp.c

@@ -35,7 +35,7 @@
 #define AXP_BOOTROM_BASE 0xfff00000
 #define AXP_BOOTROM_SIZE 0x100000
 
-static struct clk *__init get_cpu_clk(int cpu)
+static struct clk *get_cpu_clk(int cpu)
 {
 	struct clk *cpu_clk;
 	struct device_node *np = of_get_cpu_node(cpu, NULL);
@@ -48,29 +48,28 @@ static struct clk *__init get_cpu_clk(int cpu)
 	return cpu_clk;
 }
 
-static void __init set_secondary_cpus_clock(void)
+static void set_secondary_cpu_clock(unsigned int cpu)
 {
-	int thiscpu, cpu;
+	int thiscpu;
 	unsigned long rate;
 	struct clk *cpu_clk;
 
-	thiscpu = smp_processor_id();
+	thiscpu = get_cpu();
+
 	cpu_clk = get_cpu_clk(thiscpu);
 	if (!cpu_clk)
-		return;
+		goto out;
 	clk_prepare_enable(cpu_clk);
 	rate = clk_get_rate(cpu_clk);
 
-	/* set all the other CPU clk to the same rate than the boot CPU */
+	cpu_clk = get_cpu_clk(cpu);
-	for_each_possible_cpu(cpu) {
+	if (!cpu_clk)
-		if (cpu == thiscpu)
+		goto out;
-			continue;
+	clk_set_rate(cpu_clk, rate);
-		cpu_clk = get_cpu_clk(cpu);
+	clk_prepare_enable(cpu_clk);
-		if (!cpu_clk)
+
-			return;
+out:
-		clk_set_rate(cpu_clk, rate);
+	put_cpu();
-		clk_prepare_enable(cpu_clk);
-	}
 }
 
 static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle)
@@ -80,6 +79,7 @@ static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle)
 	pr_info("Booting CPU %d\n", cpu);
 
 	hw_cpu = cpu_logical_map(cpu);
+	set_secondary_cpu_clock(hw_cpu);
 	mvebu_pmsu_set_cpu_boot_addr(hw_cpu, armada_xp_secondary_startup);
 
 	/*
@@ -128,7 +128,6 @@ static void __init armada_xp_smp_prepare_cpus(unsigned int max_cpus)
 	struct resource res;
 	int err;
 
-	set_secondary_cpus_clock();
 	flush_cache_all();
 	set_cpu_coherent();
 

arch/arm/mach-mvebu/pm-board.c

@@ -0,0 +1,141 @@
+/*
+ * Board-level suspend/resume support.
+ *
+ * Copyright (C) 2014 Marvell
+ *
+ * Thomas Petazzoni <thomas.petazzoni@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.
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+#include <linux/slab.h>
+#include "common.h"
+
+#define ARMADA_XP_GP_PIC_NR_GPIOS 3
+
+static void __iomem *gpio_ctrl;
+static int pic_gpios[ARMADA_XP_GP_PIC_NR_GPIOS];
+static int pic_raw_gpios[ARMADA_XP_GP_PIC_NR_GPIOS];
+
+static void mvebu_armada_xp_gp_pm_enter(void __iomem *sdram_reg, u32 srcmd)
+{
+	u32 reg, ackcmd;
+	int i;
+
+	/* Put 001 as value on the GPIOs */
+	reg = readl(gpio_ctrl);
+	for (i = 0; i < ARMADA_XP_GP_PIC_NR_GPIOS; i++)
+		reg &= ~BIT(pic_raw_gpios[i]);
+	reg |= BIT(pic_raw_gpios[0]);
+	writel(reg, gpio_ctrl);
+
+	/* Prepare writing 111 to the GPIOs */
+	ackcmd = readl(gpio_ctrl);
+	for (i = 0; i < ARMADA_XP_GP_PIC_NR_GPIOS; i++)
+		ackcmd |= BIT(pic_raw_gpios[i]);
+
+	/*
+	 * Wait a while, the PIC needs quite a bit of time between the
+	 * two GPIO commands.
+	 */
+	mdelay(3000);
+
+	asm volatile (
+		/* Align to a cache line */
+		".balign 32\n\t"
+
+		/* Enter self refresh */
+		"str %[srcmd], [%[sdram_reg]]\n\t"
+
+		/*
+		 * Wait 100 cycles for DDR to enter self refresh, by
+		 * doing 50 times two instructions.
+		 */
+		"mov r1, #50\n\t"
+		"1: subs r1, r1, #1\n\t"
+		"bne 1b\n\t"
+
+		/* Issue the command ACK */
+		"str %[ackcmd], [%[gpio_ctrl]]\n\t"
+
+		/* Trap the processor */
+		"b .\n\t"
+		: : [srcmd] "r" (srcmd), [sdram_reg] "r" (sdram_reg),
+		  [ackcmd] "r" (ackcmd), [gpio_ctrl] "r" (gpio_ctrl) : "r1");
+}
+
+static int mvebu_armada_xp_gp_pm_init(void)
+{
+	struct device_node *np;
+	struct device_node *gpio_ctrl_np;
+	int ret = 0, i;
+
+	if (!of_machine_is_compatible("marvell,axp-gp"))
+		return -ENODEV;
+
+	np = of_find_node_by_name(NULL, "pm_pic");
+	if (!np)
+		return -ENODEV;
+
+	for (i = 0; i < ARMADA_XP_GP_PIC_NR_GPIOS; i++) {
+		char *name;
+		struct of_phandle_args args;
+
+		pic_gpios[i] = of_get_named_gpio(np, "ctrl-gpios", i);
+		if (pic_gpios[i] < 0) {
+			ret = -ENODEV;
+			goto out;
+		}
+
+		name = kasprintf(GFP_KERNEL, "pic-pin%d", i);
+		if (!name) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		ret = gpio_request(pic_gpios[i], name);
+		if (ret < 0) {
+			kfree(name);
+			goto out;
+		}
+
+		ret = gpio_direction_output(pic_gpios[i], 0);
+		if (ret < 0) {
+			gpio_free(pic_gpios[i]);
+			kfree(name);
+			goto out;
+		}
+
+		ret = of_parse_phandle_with_fixed_args(np, "ctrl-gpios", 2,
+						       i, &args);
+		if (ret < 0) {
+			gpio_free(pic_gpios[i]);
+			kfree(name);
+			goto out;
+		}
+
+		gpio_ctrl_np = args.np;
+		pic_raw_gpios[i] = args.args[0];
+	}
+
+	gpio_ctrl = of_iomap(gpio_ctrl_np, 0);
+	if (!gpio_ctrl)
+		return -ENOMEM;
+
+	mvebu_pm_init(mvebu_armada_xp_gp_pm_enter);
+
+out:
+	of_node_put(np);
+	return ret;
+}
+
+late_initcall(mvebu_armada_xp_gp_pm_init);

arch/arm/mach-mvebu/pm.c

@@ -0,0 +1,218 @@
+/*
+ * Suspend/resume support. Currently supporting Armada XP only.
+ *
+ * Copyright (C) 2014 Marvell
+ *
+ * Thomas Petazzoni <thomas.petazzoni@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.
+ */
+
+#include <linux/cpu_pm.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mbus.h>
+#include <linux/of_address.h>
+#include <linux/suspend.h>
+#include <asm/cacheflush.h>
+#include <asm/outercache.h>
+#include <asm/suspend.h>
+
+#include "coherency.h"
+#include "pmsu.h"
+
+#define SDRAM_CONFIG_OFFS                  0x0
+#define  SDRAM_CONFIG_SR_MODE_BIT          BIT(24)
+#define SDRAM_OPERATION_OFFS               0x18
+#define  SDRAM_OPERATION_SELF_REFRESH      0x7
+#define SDRAM_DLB_EVICTION_OFFS            0x30c
+#define  SDRAM_DLB_EVICTION_THRESHOLD_MASK 0xff
+
+static void (*mvebu_board_pm_enter)(void __iomem *sdram_reg, u32 srcmd);
+static void __iomem *sdram_ctrl;
+
+static int mvebu_pm_powerdown(unsigned long data)
+{
+	u32 reg, srcmd;
+
+	flush_cache_all();
+	outer_flush_all();
+
+	/*
+	 * Issue a Data Synchronization Barrier instruction to ensure
+	 * that all state saving has been completed.
+	 */
+	dsb();
+
+	/* Flush the DLB and wait ~7 usec */
+	reg = readl(sdram_ctrl + SDRAM_DLB_EVICTION_OFFS);
+	reg &= ~SDRAM_DLB_EVICTION_THRESHOLD_MASK;
+	writel(reg, sdram_ctrl + SDRAM_DLB_EVICTION_OFFS);
+
+	udelay(7);
+
+	/* Set DRAM in battery backup mode */
+	reg = readl(sdram_ctrl + SDRAM_CONFIG_OFFS);
+	reg &= ~SDRAM_CONFIG_SR_MODE_BIT;
+	writel(reg, sdram_ctrl + SDRAM_CONFIG_OFFS);
+
+	/* Prepare to go to self-refresh */
+
+	srcmd = readl(sdram_ctrl + SDRAM_OPERATION_OFFS);
+	srcmd &= ~0x1F;
+	srcmd |= SDRAM_OPERATION_SELF_REFRESH;
+
+	mvebu_board_pm_enter(sdram_ctrl + SDRAM_OPERATION_OFFS, srcmd);
+
+	return 0;
+}
+
+#define BOOT_INFO_ADDR      0x3000
+#define BOOT_MAGIC_WORD	    0xdeadb002
+#define BOOT_MAGIC_LIST_END 0xffffffff
+
+/*
+ * Those registers are accessed before switching the internal register
+ * base, which is why we hardcode the 0xd0000000 base address, the one
+ * used by the SoC out of reset.
+ */
+#define MBUS_WINDOW_12_CTRL       0xd00200b0
+#define MBUS_INTERNAL_REG_ADDRESS 0xd0020080
+
+#define SDRAM_WIN_BASE_REG(x)	(0x20180 + (0x8*x))
+#define SDRAM_WIN_CTRL_REG(x)	(0x20184 + (0x8*x))
+
+static phys_addr_t mvebu_internal_reg_base(void)
+{
+	struct device_node *np;
+	__be32 in_addr[2];
+
+	np = of_find_node_by_name(NULL, "internal-regs");
+	BUG_ON(!np);
+
+	/*
+	 * Ask the DT what is the internal register address on this
+	 * platform. In the mvebu-mbus DT binding, 0xf0010000
+	 * corresponds to the internal register window.
+	 */
+	in_addr[0] = cpu_to_be32(0xf0010000);
+	in_addr[1] = 0x0;
+
+	return of_translate_address(np, in_addr);
+}
+
+static void mvebu_pm_store_bootinfo(void)
+{
+	u32 *store_addr;
+	phys_addr_t resume_pc;
+
+	store_addr = phys_to_virt(BOOT_INFO_ADDR);
+	resume_pc = virt_to_phys(armada_370_xp_cpu_resume);
+
+	/*
+	 * The bootloader expects the first two words to be a magic
+	 * value (BOOT_MAGIC_WORD), followed by the address of the
+	 * resume code to jump to. Then, it expects a sequence of
+	 * (address, value) pairs, which can be used to restore the
+	 * value of certain registers. This sequence must end with the
+	 * BOOT_MAGIC_LIST_END magic value.
+	 */
+
+	writel(BOOT_MAGIC_WORD, store_addr++);
+	writel(resume_pc, store_addr++);
+
+	/*
+	 * Some platforms remap their internal register base address
+	 * to 0xf1000000. However, out of reset, window 12 starts at
+	 * 0xf0000000 and ends at 0xf7ffffff, which would overlap with
+	 * the internal registers. Therefore, disable window 12.
+	 */
+	writel(MBUS_WINDOW_12_CTRL, store_addr++);
+	writel(0x0, store_addr++);
+
+	/*
+	 * Set the internal register base address to the value
+	 * expected by Linux, as read from the Device Tree.
+	 */
+	writel(MBUS_INTERNAL_REG_ADDRESS, store_addr++);
+	writel(mvebu_internal_reg_base(), store_addr++);
+
+	/*
+	 * Ask the mvebu-mbus driver to store the SDRAM window
+	 * configuration, which has to be restored by the bootloader
+	 * before re-entering the kernel on resume.
+	 */
+	store_addr += mvebu_mbus_save_cpu_target(store_addr);
+
+	writel(BOOT_MAGIC_LIST_END, store_addr);
+}
+
+static int mvebu_pm_enter(suspend_state_t state)
+{
+	if (state != PM_SUSPEND_MEM)
+		return -EINVAL;
+
+	cpu_pm_enter();
+
+	mvebu_pm_store_bootinfo();
+	cpu_suspend(0, mvebu_pm_powerdown);
+
+	outer_resume();
+
+	mvebu_v7_pmsu_idle_exit();
+
+	set_cpu_coherent();
+
+	cpu_pm_exit();
+
+	return 0;
+}
+
+static const struct platform_suspend_ops mvebu_pm_ops = {
+	.enter = mvebu_pm_enter,
+	.valid = suspend_valid_only_mem,
+};
+
+int mvebu_pm_init(void (*board_pm_enter)(void __iomem *sdram_reg, u32 srcmd))
+{
+	struct device_node *np;
+	struct resource res;
+
+	if (!of_machine_is_compatible("marvell,armadaxp"))
+		return -ENODEV;
+
+	np = of_find_compatible_node(NULL, NULL,
+				     "marvell,armada-xp-sdram-controller");
+	if (!np)
+		return -ENODEV;
+
+	if (of_address_to_resource(np, 0, &res)) {
+		of_node_put(np);
+		return -ENODEV;
+	}
+
+	if (!request_mem_region(res.start, resource_size(&res),
+				np->full_name)) {
+		of_node_put(np);
+		return -EBUSY;
+	}
+
+	sdram_ctrl = ioremap(res.start, resource_size(&res));
+	if (!sdram_ctrl) {
+		release_mem_region(res.start, resource_size(&res));
+		of_node_put(np);
+		return -ENOMEM;
+	}
+
+	of_node_put(np);
+
+	mvebu_board_pm_enter = board_pm_enter;
+
+	suspend_set_ops(&mvebu_pm_ops);
+
+	return 0;
+}

arch/arm/mach-mvebu/pmsu.h

@@ -17,6 +17,7 @@ int mvebu_setup_boot_addr_wa(unsigned int crypto_eng_target,
                              phys_addr_t resume_addr_reg);
 
 void mvebu_v7_pmsu_idle_exit(void);
+void armada_370_xp_cpu_resume(void);
 
 int armada_370_xp_pmsu_idle_enter(unsigned long deepidle);
 int armada_38x_do_cpu_suspend(unsigned long deepidle);

arch/arm/mach-mvebu/pmsu_ll.S

@@ -30,6 +30,14 @@ ENDPROC(armada_38x_scu_power_up)
  */
 ENTRY(armada_370_xp_cpu_resume)
 ARM_BE8(setend	be )			@ go BE8 if entered LE
+	/*
+	 * Disable the MMU that might have been enabled in BootROM if
+	 * this code is used in the resume path of a suspend/resume
+	 * cycle.
+	 */
+	mrc	p15, 0, r1, c1, c0, 0
+	bic	r1, #1
+	mcr	p15, 0, r1, c1, c0, 0
 	bl	ll_add_cpu_to_smp_group
 	bl	ll_enable_coherency
 	b	cpu_resume

drivers/bus/mvebu-mbus.c

@@ -57,6 +57,7 @@
 #include <linux/of_address.h>
 #include <linux/debugfs.h>
 #include <linux/log2.h>
+#include <linux/syscore_ops.h>
 
 /*
  * DDR target is the same on all platforms.
@@ -94,20 +95,42 @@
 
 #define DOVE_DDR_BASE_CS_OFF(n) ((n) << 4)
 
+/* Relative to mbusbridge_base */
+#define MBUS_BRIDGE_CTRL_OFF	0x0
+#define MBUS_BRIDGE_BASE_OFF	0x4
+
+/* Maximum number of windows, for all known platforms */
+#define MBUS_WINS_MAX           20
+
 struct mvebu_mbus_state;
 
 struct mvebu_mbus_soc_data {
 	unsigned int num_wins;
 	unsigned int num_remappable_wins;
+	bool has_mbus_bridge;
 	unsigned int (*win_cfg_offset)(const int win);
 	void (*setup_cpu_target)(struct mvebu_mbus_state *s);
+	int (*save_cpu_target)(struct mvebu_mbus_state *s,
+			       u32 *store_addr);
 	int (*show_cpu_target)(struct mvebu_mbus_state *s,
 			       struct seq_file *seq, void *v);
 };
 
+/*
+ * Used to store the state of one MBus window accross suspend/resume.
+ */
+struct mvebu_mbus_win_data {
+	u32 ctrl;
+	u32 base;
+	u32 remap_lo;
+	u32 remap_hi;
+};
+
 struct mvebu_mbus_state {
 	void __iomem *mbuswins_base;
 	void __iomem *sdramwins_base;
+	void __iomem *mbusbridge_base;
+	phys_addr_t sdramwins_phys_base;
 	struct dentry *debugfs_root;
 	struct dentry *debugfs_sdram;
 	struct dentry *debugfs_devs;
@@ -115,6 +138,11 @@ struct mvebu_mbus_state {
 	struct resource pcie_io_aperture;
 	const struct mvebu_mbus_soc_data *soc;
 	int hw_io_coherency;
+
+	/* Used during suspend/resume */
+	u32 mbus_bridge_ctrl;
+	u32 mbus_bridge_base;
+	struct mvebu_mbus_win_data wins[MBUS_WINS_MAX];
 };
 
 static struct mvebu_mbus_state mbus_state;
@@ -516,6 +544,28 @@ mvebu_mbus_default_setup_cpu_target(struct mvebu_mbus_state *mbus)
 	mvebu_mbus_dram_info.num_cs = cs;
 }
 
+static int
+mvebu_mbus_default_save_cpu_target(struct mvebu_mbus_state *mbus,
+				   u32 *store_addr)
+{
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		u32 base = readl(mbus->sdramwins_base + DDR_BASE_CS_OFF(i));
+		u32 size = readl(mbus->sdramwins_base + DDR_SIZE_CS_OFF(i));
+
+		writel(mbus->sdramwins_phys_base + DDR_BASE_CS_OFF(i),
+		       store_addr++);
+		writel(base, store_addr++);
+		writel(mbus->sdramwins_phys_base + DDR_SIZE_CS_OFF(i),
+		       store_addr++);
+		writel(size, store_addr++);
+	}
+
+	/* We've written 16 words to the store address */
+	return 16;
+}
+
 static void __init
 mvebu_mbus_dove_setup_cpu_target(struct mvebu_mbus_state *mbus)
 {
@@ -546,10 +596,35 @@ mvebu_mbus_dove_setup_cpu_target(struct mvebu_mbus_state *mbus)
 	mvebu_mbus_dram_info.num_cs = cs;
 }
 
+static int
+mvebu_mbus_dove_save_cpu_target(struct mvebu_mbus_state *mbus,
+				u32 *store_addr)
+{
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		u32 map = readl(mbus->sdramwins_base + DOVE_DDR_BASE_CS_OFF(i));
+
+		writel(mbus->sdramwins_phys_base + DOVE_DDR_BASE_CS_OFF(i),
+		       store_addr++);
+		writel(map, store_addr++);
+	}
+
+	/* We've written 4 words to the store address */
+	return 4;
+}
+
+int mvebu_mbus_save_cpu_target(u32 *store_addr)
+{
+	return mbus_state.soc->save_cpu_target(&mbus_state, store_addr);
+}
+
 static const struct mvebu_mbus_soc_data armada_370_xp_mbus_data = {
 	.num_wins            = 20,
 	.num_remappable_wins = 8,
+	.has_mbus_bridge     = true,
 	.win_cfg_offset      = armada_370_xp_mbus_win_offset,
+	.save_cpu_target     = mvebu_mbus_default_save_cpu_target,
 	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
 	.show_cpu_target     = mvebu_sdram_debug_show_orion,
 };
@@ -558,6 +633,7 @@ static const struct mvebu_mbus_soc_data kirkwood_mbus_data = {
 	.num_wins            = 8,
 	.num_remappable_wins = 4,
 	.win_cfg_offset      = orion_mbus_win_offset,
+	.save_cpu_target     = mvebu_mbus_default_save_cpu_target,
 	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
 	.show_cpu_target     = mvebu_sdram_debug_show_orion,
 };
@@ -566,6 +642,7 @@ static const struct mvebu_mbus_soc_data dove_mbus_data = {
 	.num_wins            = 8,
 	.num_remappable_wins = 4,
 	.win_cfg_offset      = orion_mbus_win_offset,
+	.save_cpu_target     = mvebu_mbus_dove_save_cpu_target,
 	.setup_cpu_target    = mvebu_mbus_dove_setup_cpu_target,
 	.show_cpu_target     = mvebu_sdram_debug_show_dove,
 };
@@ -578,6 +655,7 @@ static const struct mvebu_mbus_soc_data orion5x_4win_mbus_data = {
 	.num_wins            = 8,
 	.num_remappable_wins = 4,
 	.win_cfg_offset      = orion_mbus_win_offset,
+	.save_cpu_target     = mvebu_mbus_default_save_cpu_target,
 	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
 	.show_cpu_target     = mvebu_sdram_debug_show_orion,
 };
@@ -586,6 +664,7 @@ static const struct mvebu_mbus_soc_data orion5x_2win_mbus_data = {
 	.num_wins            = 8,
 	.num_remappable_wins = 2,
 	.win_cfg_offset      = orion_mbus_win_offset,
+	.save_cpu_target     = mvebu_mbus_default_save_cpu_target,
 	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
 	.show_cpu_target     = mvebu_sdram_debug_show_orion,
 };
@@ -594,6 +673,7 @@ static const struct mvebu_mbus_soc_data mv78xx0_mbus_data = {
 	.num_wins            = 14,
 	.num_remappable_wins = 8,
 	.win_cfg_offset      = mv78xx0_mbus_win_offset,
+	.save_cpu_target     = mvebu_mbus_default_save_cpu_target,
 	.setup_cpu_target    = mvebu_mbus_default_setup_cpu_target,
 	.show_cpu_target     = mvebu_sdram_debug_show_orion,
 };
@@ -698,11 +778,73 @@ static __init int mvebu_mbus_debugfs_init(void)
 }
 fs_initcall(mvebu_mbus_debugfs_init);
 
+static int mvebu_mbus_suspend(void)
+{
+	struct mvebu_mbus_state *s = &mbus_state;
+	int win;
+
+	if (!s->mbusbridge_base)
+		return -ENODEV;
+
+	for (win = 0; win < s->soc->num_wins; win++) {
+		void __iomem *addr = s->mbuswins_base +
+			s->soc->win_cfg_offset(win);
+
+		s->wins[win].base = readl(addr + WIN_BASE_OFF);
+		s->wins[win].ctrl = readl(addr + WIN_CTRL_OFF);
+
+		if (win >= s->soc->num_remappable_wins)
+			continue;
+
+		s->wins[win].remap_lo = readl(addr + WIN_REMAP_LO_OFF);
+		s->wins[win].remap_hi = readl(addr + WIN_REMAP_HI_OFF);
+	}
+
+	s->mbus_bridge_ctrl = readl(s->mbusbridge_base +
+				    MBUS_BRIDGE_CTRL_OFF);
+	s->mbus_bridge_base = readl(s->mbusbridge_base +
+				    MBUS_BRIDGE_BASE_OFF);
+
+	return 0;
+}
+
+static void mvebu_mbus_resume(void)
+{
+	struct mvebu_mbus_state *s = &mbus_state;
+	int win;
+
+	writel(s->mbus_bridge_ctrl,
+	       s->mbusbridge_base + MBUS_BRIDGE_CTRL_OFF);
+	writel(s->mbus_bridge_base,
+	       s->mbusbridge_base + MBUS_BRIDGE_BASE_OFF);
+
+	for (win = 0; win < s->soc->num_wins; win++) {
+		void __iomem *addr = s->mbuswins_base +
+			s->soc->win_cfg_offset(win);
+
+		writel(s->wins[win].base, addr + WIN_BASE_OFF);
+		writel(s->wins[win].ctrl, addr + WIN_CTRL_OFF);
+
+		if (win >= s->soc->num_remappable_wins)
+			continue;
+
+		writel(s->wins[win].remap_lo, addr + WIN_REMAP_LO_OFF);
+		writel(s->wins[win].remap_hi, addr + WIN_REMAP_HI_OFF);
+	}
+}
+
+struct syscore_ops mvebu_mbus_syscore_ops = {
+	.suspend	= mvebu_mbus_suspend,
+	.resume		= mvebu_mbus_resume,
+};
+
 static int __init mvebu_mbus_common_init(struct mvebu_mbus_state *mbus,
 					 phys_addr_t mbuswins_phys_base,
 					 size_t mbuswins_size,
 					 phys_addr_t sdramwins_phys_base,
-					 size_t sdramwins_size)
+					 size_t sdramwins_size,
+					 phys_addr_t mbusbridge_phys_base,
+					 size_t mbusbridge_size)
 {
 	int win;
 
@@ -716,11 +858,26 @@ static int __init mvebu_mbus_common_init(struct mvebu_mbus_state *mbus,
 		return -ENOMEM;
 	}
 
+	mbus->sdramwins_phys_base = sdramwins_phys_base;
+
+	if (mbusbridge_phys_base) {
+		mbus->mbusbridge_base = ioremap(mbusbridge_phys_base,
+						mbusbridge_size);
+		if (!mbus->mbusbridge_base) {
+			iounmap(mbus->sdramwins_base);
+			iounmap(mbus->mbuswins_base);
+			return -ENOMEM;
+		}
+	} else
+		mbus->mbusbridge_base = NULL;
+
 	for (win = 0; win < mbus->soc->num_wins; win++)
 		mvebu_mbus_disable_window(mbus, win);
 
 	mbus->soc->setup_cpu_target(mbus);
 
+	register_syscore_ops(&mvebu_mbus_syscore_ops);
+
 	return 0;
 }
 
@@ -746,7 +903,7 @@ int __init mvebu_mbus_init(const char *soc, phys_addr_t mbuswins_phys_base,
 			mbuswins_phys_base,
 			mbuswins_size,
 			sdramwins_phys_base,
-			sdramwins_size);
+			sdramwins_size, 0, 0);
 }
 
 #ifdef CONFIG_OF
@@ -887,7 +1044,7 @@ static void __init mvebu_mbus_get_pcie_resources(struct device_node *np,
 
 int __init mvebu_mbus_dt_init(bool is_coherent)
 {
-	struct resource mbuswins_res, sdramwins_res;
+	struct resource mbuswins_res, sdramwins_res, mbusbridge_res;
 	struct device_node *np, *controller;
 	const struct of_device_id *of_id;
 	const __be32 *prop;
@@ -923,6 +1080,19 @@ int __init mvebu_mbus_dt_init(bool is_coherent)
 		return -EINVAL;
 	}
 
+	/*
+	 * Set the resource to 0 so that it can be left unmapped by
+	 * mvebu_mbus_common_init() if the DT doesn't carry the
+	 * necessary information. This is needed to preserve backward
+	 * compatibility.
+	 */
+	memset(&mbusbridge_res, 0, sizeof(mbusbridge_res));
+
+	if (mbus_state.soc->has_mbus_bridge) {
+		if (of_address_to_resource(controller, 2, &mbusbridge_res))
+			pr_warn(FW_WARN "deprecated mbus-mvebu Device Tree, suspend/resume will not work\n");
+	}
+
 	mbus_state.hw_io_coherency = is_coherent;
 
 	/* Get optional pcie-{mem,io}-aperture properties */
@@ -933,7 +1103,9 @@ int __init mvebu_mbus_dt_init(bool is_coherent)
 				     mbuswins_res.start,
 				     resource_size(&mbuswins_res),
 				     sdramwins_res.start,
-				     resource_size(&sdramwins_res));
+				     resource_size(&sdramwins_res),
+				     mbusbridge_res.start,
+				     resource_size(&mbusbridge_res));
 	if (ret)
 		return ret;
 

drivers/clk/mvebu/common.c

@@ -19,6 +19,7 @@
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/syscore_ops.h>
 
 #include "common.h"
 
@@ -177,14 +178,17 @@ struct clk_gating_ctrl {
 	spinlock_t *lock;
 	struct clk **gates;
 	int num_gates;
+	void __iomem *base;
+	u32 saved_reg;
 };
 
 #define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
 
+static struct clk_gating_ctrl *ctrl;
+
 static struct clk *clk_gating_get_src(
 	struct of_phandle_args *clkspec, void *data)
 {
-	struct clk_gating_ctrl *ctrl = (struct clk_gating_ctrl *)data;
 	int n;
 
 	if (clkspec->args_count < 1)
@@ -199,15 +203,35 @@ static struct clk *clk_gating_get_src(
 	return ERR_PTR(-ENODEV);
 }
 
+static int mvebu_clk_gating_suspend(void)
+{
+	ctrl->saved_reg = readl(ctrl->base);
+	return 0;
+}
+
+static void mvebu_clk_gating_resume(void)
+{
+	writel(ctrl->saved_reg, ctrl->base);
+}
+
+static struct syscore_ops clk_gate_syscore_ops = {
+	.suspend = mvebu_clk_gating_suspend,
+	.resume = mvebu_clk_gating_resume,
+};
+
 void __init mvebu_clk_gating_setup(struct device_node *np,
 				   const struct clk_gating_soc_desc *desc)
 {
-	struct clk_gating_ctrl *ctrl;
 	struct clk *clk;
 	void __iomem *base;
 	const char *default_parent = NULL;
 	int n;
 
+	if (ctrl) {
+		pr_err("mvebu-clk-gating: cannot instantiate more than one gatable clock device\n");
+		return;
+	}
+
 	base = of_iomap(np, 0);
 	if (WARN_ON(!base))
 		return;
@@ -225,6 +249,8 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
 	/* lock must already be initialized */
 	ctrl->lock = &ctrl_gating_lock;
 
+	ctrl->base = base;
+
 	/* Count, allocate, and register clock gates */
 	for (n = 0; desc[n].name;)
 		n++;
@@ -246,6 +272,8 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
 
 	of_clk_add_provider(np, clk_gating_get_src, ctrl);
 
+	register_syscore_ops(&clk_gate_syscore_ops);
+
 	return;
 gates_out:
 	kfree(ctrl);

drivers/clocksource/time-armada-370-xp.c

@@ -43,6 +43,7 @@
 #include <linux/module.h>
 #include <linux/sched_clock.h>
 #include <linux/percpu.h>
+#include <linux/syscore_ops.h>
 
 /*
  * Timer block registers.
@@ -223,6 +224,28 @@ static struct notifier_block armada_370_xp_timer_cpu_nb = {
 	.notifier_call = armada_370_xp_timer_cpu_notify,
 };
 
+static u32 timer0_ctrl_reg, timer0_local_ctrl_reg;
+
+static int armada_370_xp_timer_suspend(void)
+{
+	timer0_ctrl_reg = readl(timer_base + TIMER_CTRL_OFF);
+	timer0_local_ctrl_reg = readl(local_base + TIMER_CTRL_OFF);
+	return 0;
+}
+
+static void armada_370_xp_timer_resume(void)
+{
+	writel(0xffffffff, timer_base + TIMER0_VAL_OFF);
+	writel(0xffffffff, timer_base + TIMER0_RELOAD_OFF);
+	writel(timer0_ctrl_reg, timer_base + TIMER_CTRL_OFF);
+	writel(timer0_local_ctrl_reg, local_base + TIMER_CTRL_OFF);
+}
+
+struct syscore_ops armada_370_xp_timer_syscore_ops = {
+	.suspend	= armada_370_xp_timer_suspend,
+	.resume		= armada_370_xp_timer_resume,
+};
+
 static void __init armada_370_xp_timer_common_init(struct device_node *np)
 {
 	u32 clr = 0, set = 0;
@@ -285,6 +308,8 @@ static void __init armada_370_xp_timer_common_init(struct device_node *np)
 	/* Immediately configure the timer on the boot CPU */
 	if (!res)
 		armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
+
+	register_syscore_ops(&armada_370_xp_timer_syscore_ops);
 }
 
 static void __init armada_xp_timer_init(struct device_node *np)

drivers/irqchip/irq-armada-370-xp.c

@@ -26,6 +26,7 @@
 #include <linux/of_pci.h>
 #include <linux/irqdomain.h>
 #include <linux/slab.h>
+#include <linux/syscore_ops.h>
 #include <linux/msi.h>
 #include <asm/mach/arch.h>
 #include <asm/exception.h>
@@ -66,6 +67,7 @@
 static void __iomem *per_cpu_int_base;
 static void __iomem *main_int_base;
 static struct irq_domain *armada_370_xp_mpic_domain;
+static u32 doorbell_mask_reg;
 #ifdef CONFIG_PCI_MSI
 static struct irq_domain *armada_370_xp_msi_domain;
 static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR);
@@ -474,6 +476,54 @@ armada_370_xp_handle_irq(struct pt_regs *regs)
 	} while (1);
 }
 
+static int armada_370_xp_mpic_suspend(void)
+{
+	doorbell_mask_reg = readl(per_cpu_int_base +
+				  ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
+	return 0;
+}
+
+static void armada_370_xp_mpic_resume(void)
+{
+	int nirqs;
+	irq_hw_number_t irq;
+
+	/* Re-enable interrupts */
+	nirqs = (readl(main_int_base + ARMADA_370_XP_INT_CONTROL) >> 2) & 0x3ff;
+	for (irq = 0; irq < nirqs; irq++) {
+		struct irq_data *data;
+		int virq;
+
+		virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
+		if (virq == 0)
+			continue;
+
+		if (irq != ARMADA_370_XP_TIMER0_PER_CPU_IRQ)
+			writel(irq, per_cpu_int_base +
+			       ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
+		else
+			writel(irq, main_int_base +
+			       ARMADA_370_XP_INT_SET_ENABLE_OFFS);
+
+		data = irq_get_irq_data(virq);
+		if (!irqd_irq_disabled(data))
+			armada_370_xp_irq_unmask(data);
+	}
+
+	/* Reconfigure doorbells for IPIs and MSIs */
+	writel(doorbell_mask_reg,
+	       per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
+	if (doorbell_mask_reg & IPI_DOORBELL_MASK)
+		writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
+	if (doorbell_mask_reg & PCI_MSI_DOORBELL_MASK)
+		writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
+}
+
+struct syscore_ops armada_370_xp_mpic_syscore_ops = {
+	.suspend	= armada_370_xp_mpic_suspend,
+	.resume		= armada_370_xp_mpic_resume,
+};
+
 static int __init armada_370_xp_mpic_of_init(struct device_node *node,
 					     struct device_node *parent)
 {
@@ -530,6 +580,8 @@ static int __init armada_370_xp_mpic_of_init(struct device_node *node,
 					armada_370_xp_mpic_handle_cascade_irq);
 	}
 
+	register_syscore_ops(&armada_370_xp_mpic_syscore_ops);
+
 	return 0;
 }
 

include/linux/mbus.h

@@ -61,6 +61,7 @@ static inline const struct mbus_dram_target_info *mv_mbus_dram_info(void)
 }
 #endif
 
+int mvebu_mbus_save_cpu_target(u32 *store_addr);
 void mvebu_mbus_get_pcie_mem_aperture(struct resource *res);
 void mvebu_mbus_get_pcie_io_aperture(struct resource *res);
 int mvebu_mbus_add_window_remap_by_id(unsigned int target,