Merge tag 'at91-ab-4.13-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux into next/soc

SoC for 4.13:

 - New suspend/resume mode for sama5d2
 - Initial support for armv7m based SoCs

* tag 'at91-ab-4.13-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
  ARM: at91: remove atmel_nand_data
  ARM: at91: fix at91_suspend_entering_slow_clock link error
  ARM: at91: debug: add samv7x support
  ARM: at91: add armv7m SoC detection
  ARM: at91: handle CONFIG_PM for armv7m configurations
  ARM: at91: Add armv7m support
  ARM: at91: Document armv7m compatibles
  ARM: at91: Documentation: add armv7m families
  ARM: at91: pm: fallback to slowclock when backup mode fails
  ARM: at91: pm: allow selecting standby and suspend modes
  ARM: at91: pm: Add sama5d2 backup mode

Signed-off-by: Olof Johansson <olof@lixom.net>

10 files changed, 305 insertions, 51 deletions

diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 841e924143f9..7497a28a79d1 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -1,12 +1,20 @@
 menuconfig ARCH_AT91
 	bool "Atmel SoCs"
-	depends on ARCH_MULTI_V4T || ARCH_MULTI_V5 || ARCH_MULTI_V7
+	depends on ARCH_MULTI_V4T || ARCH_MULTI_V5 || ARCH_MULTI_V7 || ARM_SINGLE_ARMV7M
 	select COMMON_CLK_AT91
 	select GPIOLIB
 	select PINCTRL
 	select SOC_BUS
 
 if ARCH_AT91
+config SOC_SAMV7
+	bool "SAM Cortex-M7 family" if ARM_SINGLE_ARMV7M
+	select COMMON_CLK_AT91
+	select PINCTRL_AT91
+	help
+	  Select this if you are using an SoC from Atmel's SAME7, SAMS7 or SAMV7
+	  families.
+
 config SOC_SAMA5D2
 	bool "SAMA5D2 family"
 	depends on ARCH_MULTI_V7
@@ -52,6 +60,7 @@ config SOC_AT91RM9200
 	bool "AT91RM9200"
 	depends on ARCH_MULTI_V4T
 	select ATMEL_AIC_IRQ
+	select ATMEL_PM if PM
 	select ATMEL_ST
 	select CPU_ARM920T
 	select HAVE_AT91_USB_CLK
@@ -65,6 +74,7 @@ config SOC_AT91SAM9
 	bool "AT91SAM9"
 	depends on ARCH_MULTI_V5
 	select ATMEL_AIC_IRQ
+	select ATMEL_PM if PM
 	select ATMEL_SDRAMC
 	select CPU_ARM926T
 	select HAVE_AT91_SMD
@@ -123,9 +133,13 @@ config SOC_SAM_V7
 config SOC_SAMA5
 	bool
 	select ATMEL_AIC5_IRQ
+	select ATMEL_PM if PM
 	select ATMEL_SDRAMC
 	select MEMORY
 	select SOC_SAM_V7
 	select SRAM if PM
 
+config ATMEL_PM
+	bool
+
 endif
diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
index cfd8f60a9268..ee34aa34cc51 100644
--- a/arch/arm/mach-at91/Makefile
+++ b/arch/arm/mach-at91/Makefile
@@ -6,10 +6,10 @@
 obj-$(CONFIG_SOC_AT91RM9200)	+= at91rm9200.o
 obj-$(CONFIG_SOC_AT91SAM9)	+= at91sam9.o
 obj-$(CONFIG_SOC_SAMA5)		+= sama5.o
+obj-$(CONFIG_SOC_SAMV7)		+= samv7.o
 
 # Power Management
-obj-$(CONFIG_PM)		+= pm.o
-obj-$(CONFIG_PM)		+= pm_suspend.o
+obj-$(CONFIG_ATMEL_PM)		+= pm.o pm_suspend.o
 
 ifeq ($(CONFIG_CPU_V7),y)
 AFLAGS_pm_suspend.o := -march=armv7-a
diff --git a/arch/arm/mach-at91/Makefile.boot b/arch/arm/mach-at91/Makefile.boot
new file mode 100644
index 000000000000..eacfc3f5c33e
--- /dev/null
+++ b/arch/arm/mach-at91/Makefile.boot
@@ -0,0 +1,3 @@
+# Empty file waiting for deletion once Makefile.boot isn't needed any more.
+# Patch waits for application at
+# http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7889/1 .
diff --git a/arch/arm/mach-at91/generic.h b/arch/arm/mach-at91/generic.h
index f1ead0f13c19..e2bd17237964 100644
--- a/arch/arm/mach-at91/generic.h
+++ b/arch/arm/mach-at91/generic.h
@@ -15,10 +15,12 @@
 extern void __init at91rm9200_pm_init(void);
 extern void __init at91sam9_pm_init(void);
 extern void __init sama5_pm_init(void);
+extern void __init sama5d2_pm_init(void);
 #else
 static inline void __init at91rm9200_pm_init(void) { }
 static inline void __init at91sam9_pm_init(void) { }
 static inline void __init sama5_pm_init(void) { }
+static inline void __init sama5d2_pm_init(void) { }
 #endif
 
 #endif /* _AT91_GENERIC_H */
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 283e79ab587d..667fddac3856 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -15,6 +15,7 @@
 #include <linux/of_address.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/parser.h>
 #include <linux/suspend.h>
 
 #include <linux/clk/at91_pmc.h>
@@ -22,6 +23,7 @@
 #include <asm/cacheflush.h>
 #include <asm/fncpy.h>
 #include <asm/system_misc.h>
+#include <asm/suspend.h>
 
 #include "generic.h"
 #include "pm.h"
@@ -37,7 +39,17 @@ extern void at91_pinctrl_gpio_suspend(void);
 extern void at91_pinctrl_gpio_resume(void);
 #endif
 
-static struct at91_pm_data pm_data;
+static const match_table_t pm_modes __initconst = {
+	{ 0, "standby" },
+	{ AT91_PM_SLOW_CLOCK, "ulp0" },
+	{ AT91_PM_BACKUP, "backup" },
+	{ -1, NULL },
+};
+
+static struct at91_pm_data pm_data = {
+	.standby_mode = 0,
+	.suspend_mode = AT91_PM_SLOW_CLOCK,
+};
 
 #define at91_ramc_read(id, field) \
 	__raw_readl(pm_data.ramc[id] + field)
@@ -58,15 +70,33 @@ static int at91_pm_valid_state(suspend_state_t state)
 	}
 }
 
+static int canary = 0xA5A5A5A5;
 
-static suspend_state_t target_state;
+static struct at91_pm_bu {
+	int suspended;
+	unsigned long reserved;
+	phys_addr_t canary;
+	phys_addr_t resume;
+} *pm_bu;
 
 /*
  * Called after processes are frozen, but before we shutdown devices.
  */
 static int at91_pm_begin(suspend_state_t state)
 {
-	target_state = state;
+	switch (state) {
+	case PM_SUSPEND_MEM:
+		pm_data.mode = pm_data.suspend_mode;
+		break;
+
+	case PM_SUSPEND_STANDBY:
+		pm_data.mode = pm_data.standby_mode;
+		break;
+
+	default:
+		pm_data.mode = -1;
+	}
+
 	return 0;
 }
 
@@ -115,7 +145,7 @@ static int at91_pm_verify_clocks(void)
  */
 int at91_suspend_entering_slow_clock(void)
 {
-	return (target_state == PM_SUSPEND_MEM);
+	return (pm_data.mode >= AT91_PM_SLOW_CLOCK);
 }
 EXPORT_SYMBOL(at91_suspend_entering_slow_clock);
 
@@ -123,50 +153,65 @@ static void (*at91_suspend_sram_fn)(struct at91_pm_data *);
 extern void at91_pm_suspend_in_sram(struct at91_pm_data *pm_data);
 extern u32 at91_pm_suspend_in_sram_sz;
 
-static void at91_pm_suspend(suspend_state_t state)
+static int at91_suspend_finish(unsigned long val)
 {
-	pm_data.mode = (state == PM_SUSPEND_MEM) ? AT91_PM_SLOW_CLOCK : 0;
-
 	flush_cache_all();
 	outer_disable();
 
 	at91_suspend_sram_fn(&pm_data);
 
+	return 0;
+}
+
+static void at91_pm_suspend(suspend_state_t state)
+{
+	if (pm_data.mode == AT91_PM_BACKUP) {
+		pm_bu->suspended = 1;
+
+		cpu_suspend(0, at91_suspend_finish);
+
+		/* The SRAM is lost between suspend cycles */
+		at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn,
+					     &at91_pm_suspend_in_sram,
+					     at91_pm_suspend_in_sram_sz);
+	} else {
+		at91_suspend_finish(0);
+	}
+
 	outer_resume();
 }
 
+/*
+ * STANDBY mode has *all* drivers suspended; ignores irqs not marked as 'wakeup'
+ * event sources; and reduces DRAM power.  But otherwise it's identical to
+ * PM_SUSPEND_ON: cpu idle, and nothing fancy done with main or cpu clocks.
+ *
+ * AT91_PM_SLOW_CLOCK is like STANDBY plus slow clock mode, so drivers must
+ * suspend more deeply, the master clock switches to the clk32k and turns off
+ * the main oscillator
+ *
+ * AT91_PM_BACKUP turns off the whole SoC after placing the DDR in self refresh
+ */
 static int at91_pm_enter(suspend_state_t state)
 {
 #ifdef CONFIG_PINCTRL_AT91
 	at91_pinctrl_gpio_suspend();
 #endif
+
 	switch (state) {
-	/*
-	 * Suspend-to-RAM is like STANDBY plus slow clock mode, so
-	 * drivers must suspend more deeply, the master clock switches
-	 * to the clk32k and turns off the main oscillator
-	 */
 	case PM_SUSPEND_MEM:
+	case PM_SUSPEND_STANDBY:
 		/*
 		 * Ensure that clocks are in a valid state.
 		 */
-		if (!at91_pm_verify_clocks())
+		if ((pm_data.mode >= AT91_PM_SLOW_CLOCK) &&
+		    !at91_pm_verify_clocks())
 			goto error;
 
 		at91_pm_suspend(state);
 
 		break;
 
-	/*
-	 * STANDBY mode has *all* drivers suspended; ignores irqs not
-	 * marked as 'wakeup' event sources; and reduces DRAM power.
-	 * But otherwise it's identical to PM_SUSPEND_ON: cpu idle, and
-	 * nothing fancy done with main or cpu clocks.
-	 */
-	case PM_SUSPEND_STANDBY:
-		at91_pm_suspend(state);
-		break;
-
 	case PM_SUSPEND_ON:
 		cpu_do_idle();
 		break;
@@ -177,8 +222,6 @@ static int at91_pm_enter(suspend_state_t state)
 	}
 
 error:
-	target_state = PM_SUSPEND_ON;
-
 #ifdef CONFIG_PINCTRL_AT91
 	at91_pinctrl_gpio_resume();
 #endif
@@ -190,7 +233,6 @@ error:
  */
 static void at91_pm_end(void)
 {
-	target_state = PM_SUSPEND_ON;
 }
 
 
@@ -436,6 +478,79 @@ static void __init at91_pm_sram_init(void)
 			&at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
 }
 
+static void __init at91_pm_backup_init(void)
+{
+	struct gen_pool *sram_pool;
+	struct device_node *np;
+	struct platform_device *pdev = NULL;
+
+	if ((pm_data.standby_mode != AT91_PM_BACKUP) &&
+	    (pm_data.suspend_mode != AT91_PM_BACKUP))
+		return;
+
+	pm_bu = NULL;
+
+	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-shdwc");
+	if (!np) {
+		pr_warn("%s: failed to find shdwc!\n", __func__);
+		return;
+	}
+
+	pm_data.shdwc = of_iomap(np, 0);
+	of_node_put(np);
+
+	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");
+	if (!np) {
+		pr_warn("%s: failed to find sfrbu!\n", __func__);
+		goto sfrbu_fail;
+	}
+
+	pm_data.sfrbu = of_iomap(np, 0);
+	of_node_put(np);
+	pm_bu = NULL;
+
+	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
+	if (!np)
+		goto securam_fail;
+
+	pdev = of_find_device_by_node(np);
+	of_node_put(np);
+	if (!pdev) {
+		pr_warn("%s: failed to find securam device!\n", __func__);
+		goto securam_fail;
+	}
+
+	sram_pool = gen_pool_get(&pdev->dev, NULL);
+	if (!sram_pool) {
+		pr_warn("%s: securam pool unavailable!\n", __func__);
+		goto securam_fail;
+	}
+
+	pm_bu = (void *)gen_pool_alloc(sram_pool, sizeof(struct at91_pm_bu));
+	if (!pm_bu) {
+		pr_warn("%s: unable to alloc securam!\n", __func__);
+		goto securam_fail;
+	}
+
+	pm_bu->suspended = 0;
+	pm_bu->canary = virt_to_phys(&canary);
+	pm_bu->resume = virt_to_phys(cpu_resume);
+
+	return;
+
+sfrbu_fail:
+	iounmap(pm_data.shdwc);
+	pm_data.shdwc = NULL;
+securam_fail:
+	iounmap(pm_data.sfrbu);
+	pm_data.sfrbu = NULL;
+
+	if (pm_data.standby_mode == AT91_PM_BACKUP)
+		pm_data.standby_mode = AT91_PM_SLOW_CLOCK;
+	if (pm_data.suspend_mode == AT91_PM_BACKUP)
+		pm_data.suspend_mode = AT91_PM_SLOW_CLOCK;
+}
+
 struct pmc_info {
 	unsigned long uhp_udp_mask;
 };
@@ -481,10 +596,14 @@ static void __init at91_pm_init(void (*pm_idle)(void))
 
 	at91_pm_sram_init();
 
-	if (at91_suspend_sram_fn)
+	if (at91_suspend_sram_fn) {
 		suspend_set_ops(&at91_pm_ops);
-	else
+		pr_info("AT91: PM: standby: %s, suspend: %s\n",
+			pm_modes[pm_data.standby_mode].pattern,
+			pm_modes[pm_data.suspend_mode].pattern);
+	} else {
 		pr_info("AT91: PM not supported, due to no SRAM allocated\n");
+	}
 }
 
 void __init at91rm9200_pm_init(void)
@@ -510,3 +629,34 @@ void __init sama5_pm_init(void)
 	at91_dt_ramc();
 	at91_pm_init(NULL);
 }
+
+void __init sama5d2_pm_init(void)
+{
+	at91_pm_backup_init();
+	sama5_pm_init();
+}
+
+static int __init at91_pm_modes_select(char *str)
+{
+	char *s;
+	substring_t args[MAX_OPT_ARGS];
+	int standby, suspend;
+
+	if (!str)
+		return 0;
+
+	s = strsep(&str, ",");
+	standby = match_token(s, pm_modes, args);
+	if (standby < 0)
+		return 0;
+
+	suspend = match_token(str, pm_modes, args);
+	if (suspend < 0)
+		return 0;
+
+	pm_data.standby_mode = standby;
+	pm_data.suspend_mode = suspend;
+
+	return 0;
+}
+early_param("atmel.pm_modes", at91_pm_modes_select);
diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h
index fc0f7d048187..f95d31496f08 100644
--- a/arch/arm/mach-at91/pm.h
+++ b/arch/arm/mach-at91/pm.h
@@ -22,6 +22,7 @@
 #define AT91_MEMCTRL_DDRSDR	2
 
 #define	AT91_PM_SLOW_CLOCK	0x01
+#define	AT91_PM_BACKUP		0x02
 
 #ifndef __ASSEMBLY__
 struct at91_pm_data {
@@ -30,6 +31,10 @@ struct at91_pm_data {
 	unsigned long uhp_udp_mask;
 	unsigned int memctrl;
 	unsigned int mode;
+	void __iomem *shdwc;
+	void __iomem *sfrbu;
+	unsigned int standby_mode;
+	unsigned int suspend_mode;
 };
 #endif
 
diff --git a/arch/arm/mach-at91/pm_data-offsets.c b/arch/arm/mach-at91/pm_data-offsets.c
index 30302cb16df0..c0a73e62b725 100644
--- a/arch/arm/mach-at91/pm_data-offsets.c
+++ b/arch/arm/mach-at91/pm_data-offsets.c
@@ -9,5 +9,8 @@ int main(void)
 	DEFINE(PM_DATA_RAMC1,		offsetof(struct at91_pm_data, ramc[1]));
 	DEFINE(PM_DATA_MEMCTRL,	offsetof(struct at91_pm_data, memctrl));
 	DEFINE(PM_DATA_MODE,		offsetof(struct at91_pm_data, mode));
+	DEFINE(PM_DATA_SHDWC,		offsetof(struct at91_pm_data, shdwc));
+	DEFINE(PM_DATA_SFRBU,		offsetof(struct at91_pm_data, sfrbu));
+
 	return 0;
 }
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index 96781daa671a..daca91feea6a 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -97,15 +97,61 @@ ENTRY(at91_pm_suspend_in_sram)
 	str	tmp1, .memtype
 	ldr	tmp1, [r0, #PM_DATA_MODE]
 	str	tmp1, .pm_mode
+	/* Both ldrne below are here to preload their address in the TLB */
+	ldr	tmp1, [r0, #PM_DATA_SHDWC]
+	str	tmp1, .shdwc
+	cmp	tmp1, #0
+	ldrne	tmp2, [tmp1, #0]
+	ldr	tmp1, [r0, #PM_DATA_SFRBU]
+	str	tmp1, .sfr
+	cmp	tmp1, #0
+	ldrne	tmp2, [tmp1, #0x10]
 
 	/* Active the self-refresh mode */
 	mov	r0, #SRAMC_SELF_FRESH_ACTIVE
 	bl	at91_sramc_self_refresh
 
 	ldr	r0, .pm_mode
-	tst	r0, #AT91_PM_SLOW_CLOCK
-	beq	skip_disable_main_clock
+	cmp	r0, #AT91_PM_SLOW_CLOCK
+	beq	slow_clock
+	cmp	r0, #AT91_PM_BACKUP
+	beq	backup_mode
 
+	/* Wait for interrupt */
+	ldr	pmc, .pmc_base
+	at91_cpu_idle
+	b	exit_suspend
+
+slow_clock:
+	bl	at91_slowck_mode
+	b	exit_suspend
+backup_mode:
+	bl	at91_backup_mode
+	b	exit_suspend
+
+exit_suspend:
+	/* Exit the self-refresh mode */
+	mov	r0, #SRAMC_SELF_FRESH_EXIT
+	bl	at91_sramc_self_refresh
+
+	/* Restore registers, and return */
+	ldmfd	sp!, {r4 - r12, pc}
+ENDPROC(at91_pm_suspend_in_sram)
+
+ENTRY(at91_backup_mode)
+	/*BUMEN*/
+	ldr	r0, .sfr
+	mov	tmp1, #0x1
+	str	tmp1, [r0, #0x10]
+
+	/* Shutdown */
+	ldr	r0, .shdwc
+	mov	tmp1, #0xA5000000
+	add	tmp1, tmp1, #0x1
+	str	tmp1, [r0, #0]
+ENDPROC(at91_backup_mode)
+
+ENTRY(at91_slowck_mode)
 	ldr	pmc, .pmc_base
 
 	/* Save Master clock setting */
@@ -134,18 +180,9 @@ ENTRY(at91_pm_suspend_in_sram)
 	orr	tmp1, tmp1, #AT91_PMC_KEY
 	str	tmp1, [pmc, #AT91_CKGR_MOR]
 
-skip_disable_main_clock:
-	ldr	pmc, .pmc_base
-
 	/* Wait for interrupt */
 	at91_cpu_idle
 
-	ldr	r0, .pm_mode
-	tst	r0, #AT91_PM_SLOW_CLOCK
-	beq	skip_enable_main_clock
-
-	ldr	pmc, .pmc_base
-
 	/* Turn on the main oscillator */
 	ldr	tmp1, [pmc, #AT91_CKGR_MOR]
 	orr	tmp1, tmp1, #AT91_PMC_MOSCEN
@@ -174,14 +211,8 @@ skip_disable_main_clock:
 
 	wait_mckrdy
 
-skip_enable_main_clock:
-	/* Exit the self-refresh mode */
-	mov	r0, #SRAMC_SELF_FRESH_EXIT
-	bl	at91_sramc_self_refresh
-
-	/* Restore registers, and return */
-	ldmfd	sp!, {r4 - r12, pc}
-ENDPROC(at91_pm_suspend_in_sram)
+	mov	pc, lr
+ENDPROC(at91_slowck_mode)
 
 /*
  * void at91_sramc_self_refresh(unsigned int is_active)
@@ -314,6 +345,10 @@ ENDPROC(at91_sramc_self_refresh)
 	.word 0
 .sramc1_base:
 	.word 0
+.shdwc:
+	.word 0
+.sfr:
+	.word 0
 .memtype:
 	.word 0
 .pm_mode:
diff --git a/arch/arm/mach-at91/sama5.c b/arch/arm/mach-at91/sama5.c
index 6d157d0ead8e..3d0bf95a56ae 100644
--- a/arch/arm/mach-at91/sama5.c
+++ b/arch/arm/mach-at91/sama5.c
@@ -34,7 +34,6 @@ DT_MACHINE_START(sama5_dt, "Atmel SAMA5")
 MACHINE_END
 
 static const char *const sama5_alt_dt_board_compat[] __initconst = {
-	"atmel,sama5d2",
 	"atmel,sama5d4",
 	NULL
 };
@@ -45,3 +44,21 @@ DT_MACHINE_START(sama5_alt_dt, "Atmel SAMA5")
 	.dt_compat	= sama5_alt_dt_board_compat,
 	.l2c_aux_mask	= ~0UL,
 MACHINE_END
+
+static void __init sama5d2_init(void)
+{
+	of_platform_default_populate(NULL, NULL, NULL);
+	sama5d2_pm_init();
+}
+
+static const char *const sama5d2_compat[] __initconst = {
+	"atmel,sama5d2",
+	NULL
+};
+
+DT_MACHINE_START(sama5d2, "Atmel SAMA5")
+	/* Maintainer: Atmel */
+	.init_machine	= sama5d2_init,
+	.dt_compat	= sama5d2_compat,
+	.l2c_aux_mask	= ~0UL,
+MACHINE_END
diff --git a/arch/arm/mach-at91/samv7.c b/arch/arm/mach-at91/samv7.c
new file mode 100644
index 000000000000..11386f190c83
--- /dev/null
+++ b/arch/arm/mach-at91/samv7.c
@@ -0,0 +1,25 @@
+/*
+ *  Setup code for SAMv7x
+ *
+ *  Copyright (C) 2013 Atmel,
+ *                2016 Andras Szemzo <szemzo.andras@gmail.com>
+ *
+ * Licensed under GPLv2 or later.
+ */
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/system_misc.h>
+#include "generic.h"
+
+static const char *const samv7_dt_board_compat[] __initconst = {
+	"atmel,samv7",
+	NULL
+};
+
+DT_MACHINE_START(samv7_dt, "Atmel SAMV7")
+	.dt_compat	= samv7_dt_board_compat,
+MACHINE_END