Merge tag 'omap-for-v4.17/am-pm-signed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/soc

Pull "Add am335x and am437x PM code for v4.17" from Tony Lindgren:

This series of changes from Dave Gerlach adds the PM related
code to allow low-power suspend states. The code consists of
the SoC specific assembly code and a related PM driver.

* tag 'omap-for-v4.17/am-pm-signed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  soc: ti: Add pm33xx driver for basic suspend support
  ARM: OMAP2+: pm33xx-core: Add platform code needed for PM
  ARM: OMAP2+: Introduce low-level suspend code for AM43XX
  ARM: OMAP2+: Introduce low-level suspend code for AM33XX

Documentation/devicetree/bindings/arm/omap/mpu.txt

@@ -13,6 +13,13 @@ Required properties:
 Optional properties:
 - sram:	Phandle to the ocmcram node
 
+am335x and am437x only:
+- pm-sram: Phandles to ocmcram nodes to be used for power management.
+	   First should be type 'protect-exec' for the driver to use to copy
+	   and run PM functions, second should be regular pool to be used for
+	   data region for code. See Documentation/devicetree/bindings/sram/sram.txt
+	   for more details.
+
 Examples:
 
 - For an OMAP5 SMP system:
@@ -36,3 +43,12 @@ mpu {
     compatible = "ti,omap3-mpu";
     ti,hwmods = "mpu";
 };
+
+- For an AM335x system:
+
+mpu {
+	compatible = "ti,omap3-mpu";
+	ti,hwmods = "mpu";
+	pm-sram = <&pm_sram_code
+		   &pm_sram_data>;
+};

arch/arm/mach-omap2/Kconfig

@@ -72,6 +72,7 @@ config SOC_AM43XX
 	select ARM_ERRATA_754322
 	select ARM_ERRATA_775420
 	select OMAP_INTERCONNECT
+	select ARM_CPU_SUSPEND if PM
 
 config SOC_DRA7XX
 	bool "TI DRA7XX"

arch/arm/mach-omap2/Makefile

@@ -88,6 +88,8 @@ omap-4-5-pm-common			+= pm44xx.o
 obj-$(CONFIG_ARCH_OMAP4)		+= $(omap-4-5-pm-common)
 obj-$(CONFIG_SOC_OMAP5)			+= $(omap-4-5-pm-common)
 obj-$(CONFIG_SOC_DRA7XX)		+= $(omap-4-5-pm-common)
+obj-$(CONFIG_SOC_AM33XX)		+= pm33xx-core.o sleep33xx.o
+obj-$(CONFIG_SOC_AM43XX)		+= pm33xx-core.o sleep43xx.o
 obj-$(CONFIG_PM_DEBUG)			+= pm-debug.o
 
 obj-$(CONFIG_POWER_AVS_OMAP)		+= sr_device.o
@@ -95,6 +97,8 @@ obj-$(CONFIG_POWER_AVS_OMAP_CLASS3)    += smartreflex-class3.o
 
 AFLAGS_sleep24xx.o			:=-Wa,-march=armv6
 AFLAGS_sleep34xx.o			:=-Wa,-march=armv7-a$(plus_sec)
+AFLAGS_sleep33xx.o			:=-Wa,-march=armv7-a$(plus_sec)
+AFLAGS_sleep43xx.o			:=-Wa,-march=armv7-a$(plus_sec)
 
 endif
 
@@ -232,3 +236,15 @@ obj-y					+= $(omap-hsmmc-m) $(omap-hsmmc-y)
 obj-y					+= omap_phy_internal.o
 
 obj-$(CONFIG_MACH_OMAP2_TUSB6010)	+= usb-tusb6010.o
+
+arch/arm/mach-omap2/pm-asm-offsets.s: arch/arm/mach-omap2/pm-asm-offsets.c
+	$(call if_changed_dep,cc_s_c)
+
+include/generated/ti-pm-asm-offsets.h: arch/arm/mach-omap2/pm-asm-offsets.s FORCE
+	$(call filechk,offsets,__TI_PM_ASM_OFFSETS_H__)
+
+# For rule to generate ti-emif-asm-offsets.h dependency
+include drivers/memory/Makefile.asm-offsets
+
+arch/arm/mach-omap2/sleep33xx.o: include/generated/ti-pm-asm-offsets.h include/generated/ti-emif-asm-offsets.h
+arch/arm/mach-omap2/sleep43xx.o: include/generated/ti-pm-asm-offsets.h include/generated/ti-emif-asm-offsets.h

arch/arm/mach-omap2/common.h

@@ -77,6 +77,13 @@ static inline int omap4_pm_init_early(void)
 }
 #endif
 
+#if defined(CONFIG_PM) && (defined(CONFIG_SOC_AM33XX) || \
+	defined(CONFIG_SOC_AM43XX))
+void amx3_common_pm_init(void);
+#else
+static inline void amx3_common_pm_init(void) { }
+#endif
+
 extern void omap2_init_common_infrastructure(void);
 
 extern void omap_init_time(void);

arch/arm/mach-omap2/io.c

@@ -622,6 +622,7 @@ void __init am33xx_init_early(void)
 void __init am33xx_init_late(void)
 {
 	omap_common_late_init();
+	amx3_common_pm_init();
 }
 #endif
 
@@ -646,6 +647,7 @@ void __init am43xx_init_late(void)
 {
 	omap_common_late_init();
 	omap2_clk_enable_autoidle_all();
+	amx3_common_pm_init();
 }
 #endif
 

arch/arm/mach-omap2/pm-asm-offsets.c

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TI AM33XX and AM43XX PM Assembly Offsets
+ *
+ * Copyright (C) 2017-2018 Texas Instruments Inc.
+ */
+
+#include <linux/kbuild.h>
+#include <linux/platform_data/pm33xx.h>
+
+int main(void)
+{
+	DEFINE(AMX3_PM_WFI_FLAGS_OFFSET,
+	       offsetof(struct am33xx_pm_sram_data, wfi_flags));
+	DEFINE(AMX3_PM_L2_AUX_CTRL_VAL_OFFSET,
+	       offsetof(struct am33xx_pm_sram_data, l2_aux_ctrl_val));
+	DEFINE(AMX3_PM_L2_PREFETCH_CTRL_VAL_OFFSET,
+	       offsetof(struct am33xx_pm_sram_data, l2_prefetch_ctrl_val));
+	DEFINE(AMX3_PM_SRAM_DATA_SIZE, sizeof(struct am33xx_pm_sram_data));
+
+	BLANK();
+
+	DEFINE(AMX3_PM_RO_SRAM_DATA_VIRT_OFFSET,
+	       offsetof(struct am33xx_pm_ro_sram_data, amx3_pm_sram_data_virt));
+	DEFINE(AMX3_PM_RO_SRAM_DATA_PHYS_OFFSET,
+	       offsetof(struct am33xx_pm_ro_sram_data, amx3_pm_sram_data_phys));
+	DEFINE(AMX3_PM_RO_SRAM_DATA_SIZE,
+	       sizeof(struct am33xx_pm_ro_sram_data));
+
+	return 0;
+}

arch/arm/mach-omap2/pm.h

@@ -81,6 +81,9 @@ extern unsigned int omap3_do_wfi_sz;
 /* ... and its pointer from SRAM after copy */
 extern void (*omap3_do_wfi_sram)(void);
 
+extern struct am33xx_pm_sram_addr am33xx_pm_sram;
+extern struct am33xx_pm_sram_addr am43xx_pm_sram;
+
 extern void omap3_save_scratchpad_contents(void);
 
 #define PM_RTA_ERRATUM_i608		(1 << 0)

arch/arm/mach-omap2/pm33xx-core.c

@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AM33XX Arch Power Management Routines
+ *
+ * Copyright (C) 2016-2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Dave Gerlach
+ */
+
+#include <asm/smp_scu.h>
+#include <asm/suspend.h>
+#include <linux/errno.h>
+#include <linux/platform_data/pm33xx.h>
+
+#include "cm33xx.h"
+#include "common.h"
+#include "control.h"
+#include "clockdomain.h"
+#include "iomap.h"
+#include "omap_hwmod.h"
+#include "pm.h"
+#include "powerdomain.h"
+#include "prm33xx.h"
+#include "soc.h"
+#include "sram.h"
+
+static struct powerdomain *cefuse_pwrdm, *gfx_pwrdm, *per_pwrdm, *mpu_pwrdm;
+static struct clockdomain *gfx_l4ls_clkdm;
+static void __iomem *scu_base;
+
+static int __init am43xx_map_scu(void)
+{
+	scu_base = ioremap(scu_a9_get_base(), SZ_256);
+
+	if (!scu_base)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int amx3_common_init(void)
+{
+	gfx_pwrdm = pwrdm_lookup("gfx_pwrdm");
+	per_pwrdm = pwrdm_lookup("per_pwrdm");
+	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
+
+	if ((!gfx_pwrdm) || (!per_pwrdm) || (!mpu_pwrdm))
+		return -ENODEV;
+
+	(void)clkdm_for_each(omap_pm_clkdms_setup, NULL);
+
+	/* CEFUSE domain can be turned off post bootup */
+	cefuse_pwrdm = pwrdm_lookup("cefuse_pwrdm");
+	if (cefuse_pwrdm)
+		omap_set_pwrdm_state(cefuse_pwrdm, PWRDM_POWER_OFF);
+	else
+		pr_err("PM: Failed to get cefuse_pwrdm\n");
+
+	return 0;
+}
+
+static int am33xx_suspend_init(void)
+{
+	int ret;
+
+	gfx_l4ls_clkdm = clkdm_lookup("gfx_l4ls_gfx_clkdm");
+
+	if (!gfx_l4ls_clkdm) {
+		pr_err("PM: Cannot lookup gfx_l4ls_clkdm clockdomains\n");
+		return -ENODEV;
+	}
+
+	ret = amx3_common_init();
+
+	return ret;
+}
+
+static int am43xx_suspend_init(void)
+{
+	int ret = 0;
+
+	ret = am43xx_map_scu();
+	if (ret) {
+		pr_err("PM: Could not ioremap SCU\n");
+		return ret;
+	}
+
+	ret = amx3_common_init();
+
+	return ret;
+}
+
+static void amx3_pre_suspend_common(void)
+{
+	omap_set_pwrdm_state(gfx_pwrdm, PWRDM_POWER_OFF);
+}
+
+static void amx3_post_suspend_common(void)
+{
+	int status;
+	/*
+	 * Because gfx_pwrdm is the only one under MPU control,
+	 * comment on transition status
+	 */
+	status = pwrdm_read_pwrst(gfx_pwrdm);
+	if (status != PWRDM_POWER_OFF)
+		pr_err("PM: GFX domain did not transition: %x\n", status);
+}
+
+static int am33xx_suspend(unsigned int state, int (*fn)(unsigned long))
+{
+	int ret = 0;
+
+	amx3_pre_suspend_common();
+	ret = cpu_suspend(0, fn);
+	amx3_post_suspend_common();
+
+	/*
+	 * BUG: GFX_L4LS clock domain needs to be woken up to
+	 * ensure thet L4LS clock domain does not get stuck in
+	 * transition. If that happens L3 module does not get
+	 * disabled, thereby leading to PER power domain
+	 * transition failing
+	 */
+
+	clkdm_wakeup(gfx_l4ls_clkdm);
+	clkdm_sleep(gfx_l4ls_clkdm);
+
+	return ret;
+}
+
+static int am43xx_suspend(unsigned int state, int (*fn)(unsigned long))
+{
+	int ret = 0;
+
+	amx3_pre_suspend_common();
+	scu_power_mode(scu_base, SCU_PM_POWEROFF);
+	ret = cpu_suspend(0, fn);
+	scu_power_mode(scu_base, SCU_PM_NORMAL);
+	amx3_post_suspend_common();
+
+	return ret;
+}
+
+static struct am33xx_pm_sram_addr *amx3_get_sram_addrs(void)
+{
+	if (soc_is_am33xx())
+		return &am33xx_pm_sram;
+	else if (soc_is_am437x())
+		return &am43xx_pm_sram;
+	else
+		return NULL;
+}
+
+static struct am33xx_pm_platform_data am33xx_ops = {
+	.init = am33xx_suspend_init,
+	.soc_suspend = am33xx_suspend,
+	.get_sram_addrs = amx3_get_sram_addrs,
+};
+
+static struct am33xx_pm_platform_data am43xx_ops = {
+	.init = am43xx_suspend_init,
+	.soc_suspend = am43xx_suspend,
+	.get_sram_addrs = amx3_get_sram_addrs,
+};
+
+static struct am33xx_pm_platform_data *am33xx_pm_get_pdata(void)
+{
+	if (soc_is_am33xx())
+		return &am33xx_ops;
+	else if (soc_is_am437x())
+		return &am43xx_ops;
+	else
+		return NULL;
+}
+
+void __init amx3_common_pm_init(void)
+{
+	struct am33xx_pm_platform_data *pdata;
+	struct platform_device_info devinfo;
+
+	pdata = am33xx_pm_get_pdata();
+
+	memset(&devinfo, 0, sizeof(devinfo));
+	devinfo.name = "pm33xx";
+	devinfo.data = pdata;
+	devinfo.size_data = sizeof(*pdata);
+	devinfo.id = -1;
+	platform_device_register_full(&devinfo);
+}

arch/arm/mach-omap2/sleep33xx.S

@@ -0,0 +1,214 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Low level suspend code for AM33XX SoCs
+ *
+ * Copyright (C) 2012-2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Dave Gerlach, Vaibhav Bedia
+ */
+
+#include <generated/ti-emif-asm-offsets.h>
+#include <generated/ti-pm-asm-offsets.h>
+#include <linux/linkage.h>
+#include <linux/ti-emif-sram.h>
+#include <asm/assembler.h>
+#include <asm/memory.h>
+
+#include "iomap.h"
+#include "cm33xx.h"
+
+#define AM33XX_CM_CLKCTRL_MODULESTATE_DISABLED			0x00030000
+#define AM33XX_CM_CLKCTRL_MODULEMODE_DISABLE			0x0003
+#define AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE			0x0002
+
+	.arm
+	.align 3
+
+ENTRY(am33xx_do_wfi)
+	stmfd	sp!, {r4 - r11, lr}	@ save registers on stack
+
+	/*
+	 * Flush all data from the L1 and L2 data cache before disabling
+	 * SCTLR.C bit.
+	 */
+	ldr	r1, kernel_flush
+	blx	r1
+
+	/*
+	 * Clear the SCTLR.C bit to prevent further data cache
+	 * allocation. Clearing SCTLR.C would make all the data accesses
+	 * strongly ordered and would not hit the cache.
+	 */
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 2)	@ Disable the C bit
+	mcr	p15, 0, r0, c1, c0, 0
+	isb
+
+	/*
+	 * Invalidate L1 and L2 data cache.
+	 */
+	ldr	r1, kernel_flush
+	blx	r1
+
+	adr	r9, am33xx_emif_sram_table
+
+	ldr	r3, [r9, #EMIF_PM_ENTER_SR_OFFSET]
+	blx	r3
+
+	ldr	r3, [r9, #EMIF_PM_SAVE_CONTEXT_OFFSET]
+	blx	r3
+
+	/* Disable EMIF */
+	ldr     r1, virt_emif_clkctrl
+	ldr     r2, [r1]
+	bic     r2, r2, #AM33XX_CM_CLKCTRL_MODULEMODE_DISABLE
+	str     r2, [r1]
+
+	ldr	r1, virt_emif_clkctrl
+wait_emif_disable:
+	ldr	r2, [r1]
+	mov	r3, #AM33XX_CM_CLKCTRL_MODULESTATE_DISABLED
+	cmp	r2, r3
+	bne	wait_emif_disable
+
+	/*
+	 * For the MPU WFI to be registered as an interrupt
+	 * to WKUP_M3, MPU_CLKCTRL.MODULEMODE needs to be set
+	 * to DISABLED
+	 */
+	ldr	r1, virt_mpu_clkctrl
+	ldr	r2, [r1]
+	bic	r2, r2, #AM33XX_CM_CLKCTRL_MODULEMODE_DISABLE
+	str	r2, [r1]
+
+	/*
+	 * Execute an ISB instruction to ensure that all of the
+	 * CP15 register changes have been committed.
+	 */
+	isb
+
+	/*
+	 * Execute a barrier instruction to ensure that all cache,
+	 * TLB and branch predictor maintenance operations issued
+	 * have completed.
+	 */
+	dsb
+	dmb
+
+	/*
+	 * Execute a WFI instruction and wait until the
+	 * STANDBYWFI output is asserted to indicate that the
+	 * CPU is in idle and low power state. CPU can specualatively
+	 * prefetch the instructions so add NOPs after WFI. Thirteen
+	 * NOPs as per Cortex-A8 pipeline.
+	 */
+	wfi
+
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+
+	/* We come here in case of an abort due to a late interrupt */
+
+	/* Set MPU_CLKCTRL.MODULEMODE back to ENABLE */
+	ldr	r1, virt_mpu_clkctrl
+	mov	r2, #AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE
+	str	r2, [r1]
+
+	/* Re-enable EMIF */
+	ldr	r1, virt_emif_clkctrl
+	mov	r2, #AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE
+	str	r2, [r1]
+wait_emif_enable:
+	ldr	r3, [r1]
+	cmp	r2, r3
+	bne	wait_emif_enable
+
+
+	ldr	r1, [r9, #EMIF_PM_ABORT_SR_OFFSET]
+	blx	r1
+
+	/*
+	 * Set SCTLR.C bit to allow data cache allocation
+	 */
+	mrc	p15, 0, r0, c1, c0, 0
+	orr	r0, r0, #(1 << 2)	@ Enable the C bit
+	mcr	p15, 0, r0, c1, c0, 0
+	isb
+
+	/* Let the suspend code know about the abort */
+	mov	r0, #1
+	ldmfd	sp!, {r4 - r11, pc}	@ restore regs and return
+ENDPROC(am33xx_do_wfi)
+
+	.align
+ENTRY(am33xx_resume_offset)
+	.word . - am33xx_do_wfi
+
+ENTRY(am33xx_resume_from_deep_sleep)
+	/* Re-enable EMIF */
+	ldr	r0, phys_emif_clkctrl
+	mov	r1, #AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE
+	str	r1, [r0]
+wait_emif_enable1:
+	ldr	r2, [r0]
+	cmp	r1, r2
+	bne	wait_emif_enable1
+
+	adr	r9, am33xx_emif_sram_table
+
+	ldr	r1, [r9, #EMIF_PM_RESTORE_CONTEXT_OFFSET]
+	blx	r1
+
+	ldr	r1, [r9, #EMIF_PM_EXIT_SR_OFFSET]
+	blx	r1
+
+resume_to_ddr:
+	/* We are back. Branch to the common CPU resume routine */
+	mov	r0, #0
+	ldr	pc, resume_addr
+ENDPROC(am33xx_resume_from_deep_sleep)
+
+/*
+ * Local variables
+ */
+	.align
+resume_addr:
+	.word	cpu_resume - PAGE_OFFSET + 0x80000000
+kernel_flush:
+	.word   v7_flush_dcache_all
+virt_mpu_clkctrl:
+	.word	AM33XX_CM_MPU_MPU_CLKCTRL
+virt_emif_clkctrl:
+	.word	AM33XX_CM_PER_EMIF_CLKCTRL
+phys_emif_clkctrl:
+	.word	(AM33XX_CM_BASE + AM33XX_CM_PER_MOD + \
+		AM33XX_CM_PER_EMIF_CLKCTRL_OFFSET)
+
+.align 3
+/* DDR related defines */
+am33xx_emif_sram_table:
+	.space EMIF_PM_FUNCTIONS_SIZE
+
+ENTRY(am33xx_pm_sram)
+	.word am33xx_do_wfi
+	.word am33xx_do_wfi_sz
+	.word am33xx_resume_offset
+	.word am33xx_emif_sram_table
+	.word am33xx_pm_ro_sram_data
+
+.align 3
+ENTRY(am33xx_pm_ro_sram_data)
+	.space AMX3_PM_RO_SRAM_DATA_SIZE
+
+ENTRY(am33xx_do_wfi_sz)
+	.word	. - am33xx_do_wfi

arch/arm/mach-omap2/sleep43xx.S

@@ -0,0 +1,387 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Low level suspend code for AM43XX SoCs
+ *
+ * Copyright (C) 2013-2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Dave Gerlach, Vaibhav Bedia
+ */
+
+#include <generated/ti-emif-asm-offsets.h>
+#include <generated/ti-pm-asm-offsets.h>
+#include <linux/linkage.h>
+#include <linux/ti-emif-sram.h>
+
+#include <asm/assembler.h>
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/memory.h>
+
+#include "cm33xx.h"
+#include "common.h"
+#include "iomap.h"
+#include "omap-secure.h"
+#include "omap44xx.h"
+#include "prm33xx.h"
+#include "prcm43xx.h"
+
+#define AM33XX_CM_CLKCTRL_MODULESTATE_DISABLED		0x00030000
+#define AM33XX_CM_CLKCTRL_MODULEMODE_DISABLE		0x0003
+#define AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE		0x0002
+
+#define AM43XX_EMIF_POWEROFF_ENABLE			0x1
+#define AM43XX_EMIF_POWEROFF_DISABLE			0x0
+
+#define AM43XX_CM_CLKSTCTRL_CLKTRCTRL_SW_SLEEP		0x1
+#define AM43XX_CM_CLKSTCTRL_CLKTRCTRL_HW_AUTO		0x3
+
+#define AM43XX_CM_BASE					0x44DF0000
+
+#define AM43XX_CM_REGADDR(inst, reg)                           \
+       AM33XX_L4_WK_IO_ADDRESS(AM43XX_CM_BASE + (inst) + (reg))
+
+#define AM43XX_CM_MPU_CLKSTCTRL AM43XX_CM_REGADDR(AM43XX_CM_MPU_INST, \
+					AM43XX_CM_MPU_MPU_CDOFFS)
+#define AM43XX_CM_MPU_MPU_CLKCTRL AM43XX_CM_REGADDR(AM43XX_CM_MPU_INST, \
+					AM43XX_CM_MPU_MPU_CLKCTRL_OFFSET)
+#define AM43XX_CM_PER_EMIF_CLKCTRL  AM43XX_CM_REGADDR(AM43XX_CM_PER_INST, \
+					AM43XX_CM_PER_EMIF_CLKCTRL_OFFSET)
+#define AM43XX_PRM_EMIF_CTRL_OFFSET			0x0030
+
+	.arm
+	.align 3
+
+ENTRY(am43xx_do_wfi)
+	stmfd	sp!, {r4 - r11, lr}	@ save registers on stack
+
+	/* Retrieve l2 cache virt address BEFORE we shut off EMIF */
+	ldr	r1, get_l2cache_base
+	blx	r1
+	mov	r8, r0
+
+	/*
+	 * Flush all data from the L1 and L2 data cache before disabling
+	 * SCTLR.C bit.
+	 */
+	ldr	r1, kernel_flush
+	blx	r1
+
+	/*
+	 * Clear the SCTLR.C bit to prevent further data cache
+	 * allocation. Clearing SCTLR.C would make all the data accesses
+	 * strongly ordered and would not hit the cache.
+	 */
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 2)	@ Disable the C bit
+	mcr	p15, 0, r0, c1, c0, 0
+	isb
+	dsb
+
+	/*
+	 * Invalidate L1 and L2 data cache.
+	 */
+	ldr	r1, kernel_flush
+	blx	r1
+
+#ifdef CONFIG_CACHE_L2X0
+	/*
+	 * Clean and invalidate the L2 cache.
+	 */
+#ifdef CONFIG_PL310_ERRATA_727915
+	mov	r0, #0x03
+	mov	r12, #OMAP4_MON_L2X0_DBG_CTRL_INDEX
+	dsb
+	smc	#0
+	dsb
+#endif
+	mov	r0, r8
+	adr	r4, am43xx_pm_ro_sram_data
+	ldr	r3, [r4, #AMX3_PM_RO_SRAM_DATA_VIRT_OFFSET]
+
+	mov	r2, r0
+	ldr	r0, [r2, #L2X0_AUX_CTRL]
+	str	r0, [r3, #AMX3_PM_L2_AUX_CTRL_VAL_OFFSET]
+	ldr	r0, [r2, #L310_PREFETCH_CTRL]
+	str	r0, [r3, #AMX3_PM_L2_PREFETCH_CTRL_VAL_OFFSET]
+
+	ldr	r0, l2_val
+	str	r0, [r2, #L2X0_CLEAN_INV_WAY]
+wait:
+	ldr	r0, [r2, #L2X0_CLEAN_INV_WAY]
+	ldr	r1, l2_val
+	ands	r0, r0, r1
+	bne	wait
+#ifdef CONFIG_PL310_ERRATA_727915
+	mov	r0, #0x00
+	mov	r12, #OMAP4_MON_L2X0_DBG_CTRL_INDEX
+	dsb
+	smc	#0
+	dsb
+#endif
+l2x_sync:
+	mov	r0, r8
+	mov	r2, r0
+	mov	r0, #0x0
+	str	r0, [r2, #L2X0_CACHE_SYNC]
+sync:
+	ldr	r0, [r2, #L2X0_CACHE_SYNC]
+	ands	r0, r0, #0x1
+	bne	sync
+#endif
+
+	adr     r9, am43xx_emif_sram_table
+
+	ldr     r3, [r9, #EMIF_PM_ENTER_SR_OFFSET]
+	blx     r3
+
+	ldr     r3, [r9, #EMIF_PM_SAVE_CONTEXT_OFFSET]
+	blx     r3
+
+	/* Disable EMIF */
+	ldr	r1, am43xx_virt_emif_clkctrl
+	ldr	r2, [r1]
+	bic	r2, r2, #AM33XX_CM_CLKCTRL_MODULEMODE_DISABLE
+	str	r2, [r1]
+
+wait_emif_disable:
+	ldr	r2, [r1]
+	mov	r3, #AM33XX_CM_CLKCTRL_MODULESTATE_DISABLED
+	cmp	r2, r3
+	bne	wait_emif_disable
+
+	/*
+	 * For the MPU WFI to be registered as an interrupt
+	 * to WKUP_M3, MPU_CLKCTRL.MODULEMODE needs to be set
+	 * to DISABLED
+	 */
+	ldr	r1, am43xx_virt_mpu_clkctrl
+	ldr	r2, [r1]
+	bic	r2, r2, #AM33XX_CM_CLKCTRL_MODULEMODE_DISABLE
+	str	r2, [r1]
+
+	/*
+	 * Put MPU CLKDM to SW_SLEEP
+	 */
+	ldr	r1, am43xx_virt_mpu_clkstctrl
+	mov	r2, #AM43XX_CM_CLKSTCTRL_CLKTRCTRL_SW_SLEEP
+	str	r2, [r1]
+
+	/*
+	 * Execute a barrier instruction to ensure that all cache,
+	 * TLB and branch predictor maintenance operations issued
+	 * have completed.
+	 */
+	dsb
+	dmb
+
+	/*
+	 * Execute a WFI instruction and wait until the
+	 * STANDBYWFI output is asserted to indicate that the
+	 * CPU is in idle and low power state. CPU can specualatively
+	 * prefetch the instructions so add NOPs after WFI. Sixteen
+	 * NOPs as per Cortex-A9 pipeline.
+	 */
+	wfi
+
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+
+	/* We come here in case of an abort due to a late interrupt */
+	ldr	r1, am43xx_virt_mpu_clkstctrl
+	mov	r2, #AM43XX_CM_CLKSTCTRL_CLKTRCTRL_HW_AUTO
+	str	r2, [r1]
+
+	/* Set MPU_CLKCTRL.MODULEMODE back to ENABLE */
+	ldr	r1, am43xx_virt_mpu_clkctrl
+	mov	r2, #AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE
+	str	r2, [r1]
+
+	/* Re-enable EMIF */
+	ldr	r1, am43xx_virt_emif_clkctrl
+	mov	r2, #AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE
+	str	r2, [r1]
+wait_emif_enable:
+	ldr	r3, [r1]
+	cmp	r2, r3
+	bne	wait_emif_enable
+
+	/*
+	 * Set SCTLR.C bit to allow data cache allocation
+	 */
+	mrc	p15, 0, r0, c1, c0, 0
+	orr	r0, r0, #(1 << 2)	@ Enable the C bit
+	mcr	p15, 0, r0, c1, c0, 0
+	isb
+
+	ldr     r1, [r9, #EMIF_PM_ABORT_SR_OFFSET]
+	blx     r1
+
+	/* Let the suspend code know about the abort */
+	mov	r0, #1
+	ldmfd	sp!, {r4 - r11, pc}	@ restore regs and return
+ENDPROC(am43xx_do_wfi)
+
+	.align
+ENTRY(am43xx_resume_offset)
+	.word . - am43xx_do_wfi
+
+ENTRY(am43xx_resume_from_deep_sleep)
+	/* Set MPU CLKSTCTRL to HW AUTO so that CPUidle works properly */
+	ldr	r1, am43xx_virt_mpu_clkstctrl
+	mov	r2, #AM43XX_CM_CLKSTCTRL_CLKTRCTRL_HW_AUTO
+	str	r2, [r1]
+
+	/* For AM43xx, use EMIF power down until context is restored */
+	ldr	r2, am43xx_phys_emif_poweroff
+	mov	r1, #AM43XX_EMIF_POWEROFF_ENABLE
+	str	r1, [r2, #0x0]
+
+	/* Re-enable EMIF */
+	ldr	r1, am43xx_phys_emif_clkctrl
+	mov	r2, #AM33XX_CM_CLKCTRL_MODULEMODE_ENABLE
+	str	r2, [r1]
+wait_emif_enable1:
+	ldr	r3, [r1]
+	cmp	r2, r3
+	bne	wait_emif_enable1
+
+	adr     r9, am43xx_emif_sram_table
+
+	ldr     r1, [r9, #EMIF_PM_RESTORE_CONTEXT_OFFSET]
+	blx     r1
+
+	ldr     r1, [r9, #EMIF_PM_EXIT_SR_OFFSET]
+	blx     r1
+
+	ldr     r2, am43xx_phys_emif_poweroff
+	mov     r1, #AM43XX_EMIF_POWEROFF_DISABLE
+	str     r1, [r2, #0x0]
+
+#ifdef CONFIG_CACHE_L2X0
+	ldr	r2, l2_cache_base
+	ldr	r0, [r2, #L2X0_CTRL]
+	and	r0, #0x0f
+	cmp	r0, #1
+	beq	skip_l2en			@ Skip if already enabled
+
+	adr	r4, am43xx_pm_ro_sram_data
+	ldr	r3, [r4, #AMX3_PM_RO_SRAM_DATA_PHYS_OFFSET]
+	ldr     r0, [r3, #AMX3_PM_L2_PREFETCH_CTRL_VAL_OFFSET]
+
+	ldr	r12, l2_smc1
+	dsb
+	smc	#0
+	dsb
+set_aux_ctrl:
+	ldr     r0, [r3, #AMX3_PM_L2_AUX_CTRL_VAL_OFFSET]
+	ldr	r12, l2_smc2
+	dsb
+	smc	#0
+	dsb
+
+	/* L2 invalidate on resume */
+	ldr	r0, l2_val
+	ldr	r2, l2_cache_base
+	str	r0, [r2, #L2X0_INV_WAY]
+wait2:
+	ldr	r0, [r2, #L2X0_INV_WAY]
+	ldr	r1, l2_val
+	ands	r0, r0, r1
+	bne	wait2
+#ifdef CONFIG_PL310_ERRATA_727915
+	mov	r0, #0x00
+	mov	r12, #OMAP4_MON_L2X0_DBG_CTRL_INDEX
+	dsb
+	smc	#0
+	dsb
+#endif
+l2x_sync2:
+	ldr	r2, l2_cache_base
+	mov	r0, #0x0
+	str	r0, [r2, #L2X0_CACHE_SYNC]
+sync2:
+	ldr	r0, [r2, #L2X0_CACHE_SYNC]
+	ands	r0, r0, #0x1
+	bne	sync2
+
+	mov	r0, #0x1
+	ldr	r12, l2_smc3
+	dsb
+	smc	#0
+	dsb
+#endif
+skip_l2en:
+	/* We are back. Branch to the common CPU resume routine */
+	mov	r0, #0
+	ldr	pc, resume_addr
+ENDPROC(am43xx_resume_from_deep_sleep)
+
+/*
+ * Local variables
+ */
+	.align
+resume_addr:
+	.word	cpu_resume - PAGE_OFFSET + 0x80000000
+get_l2cache_base:
+	.word	omap4_get_l2cache_base
+kernel_flush:
+	.word   v7_flush_dcache_all
+ddr_start:
+	.word	PAGE_OFFSET
+
+am43xx_phys_emif_poweroff:
+	.word   (AM43XX_CM_BASE + AM43XX_PRM_DEVICE_INST + \
+		 AM43XX_PRM_EMIF_CTRL_OFFSET)
+am43xx_virt_mpu_clkstctrl:
+	.word	(AM43XX_CM_MPU_CLKSTCTRL)
+am43xx_virt_mpu_clkctrl:
+	.word	(AM43XX_CM_MPU_MPU_CLKCTRL)
+am43xx_virt_emif_clkctrl:
+	.word	(AM43XX_CM_PER_EMIF_CLKCTRL)
+am43xx_phys_emif_clkctrl:
+	.word	(AM43XX_CM_BASE + AM43XX_CM_PER_INST + \
+		 AM43XX_CM_PER_EMIF_CLKCTRL_OFFSET)
+
+/* L2 cache related defines for AM437x */
+l2_cache_base:
+	.word	OMAP44XX_L2CACHE_BASE
+l2_smc1:
+	.word	OMAP4_MON_L2X0_PREFETCH_INDEX
+l2_smc2:
+	.word	OMAP4_MON_L2X0_AUXCTRL_INDEX
+l2_smc3:
+	.word	OMAP4_MON_L2X0_CTRL_INDEX
+l2_val:
+	.word	0xffff
+
+.align 3
+/* DDR related defines */
+ENTRY(am43xx_emif_sram_table)
+	.space EMIF_PM_FUNCTIONS_SIZE
+
+ENTRY(am43xx_pm_sram)
+	.word am43xx_do_wfi
+	.word am43xx_do_wfi_sz
+	.word am43xx_resume_offset
+	.word am43xx_emif_sram_table
+	.word am43xx_pm_ro_sram_data
+
+.align 3
+
+ENTRY(am43xx_pm_ro_sram_data)
+	.space AMX3_PM_RO_SRAM_DATA_SIZE
+
+ENTRY(am43xx_do_wfi_sz)
+	.word	. - am43xx_do_wfi

drivers/soc/ti/Kconfig

@@ -28,6 +28,15 @@ config KEYSTONE_NAVIGATOR_DMA
 
 	  If unsure, say N.
 
+config AMX3_PM
+	tristate "AMx3 Power Management"
+	depends on SOC_AM33XX || SOC_AM43XX
+	depends on WKUP_M3_IPC && TI_EMIF_SRAM && SRAM
+	help
+	  Enable power management on AM335x and AM437x. Required for suspend to mem
+	  and standby states on both AM335x and AM437x platforms and for deeper cpuidle
+	  c-states on AM335x.
+
 config WKUP_M3_IPC
 	tristate "TI AMx3 Wkup-M3 IPC Driver"
 	depends on WKUP_M3_RPROC

drivers/soc/ti/Makefile

@@ -5,5 +5,6 @@
 obj-$(CONFIG_KEYSTONE_NAVIGATOR_QMSS)	+= knav_qmss.o
 knav_qmss-y := knav_qmss_queue.o knav_qmss_acc.o
 obj-$(CONFIG_KEYSTONE_NAVIGATOR_DMA)	+= knav_dma.o
+obj-$(CONFIG_AMX3_PM)			+= pm33xx.o
 obj-$(CONFIG_WKUP_M3_IPC)		+= wkup_m3_ipc.o
 obj-$(CONFIG_TI_SCI_PM_DOMAINS)		+= ti_sci_pm_domains.o

drivers/soc/ti/pm33xx.c

@@ -0,0 +1,349 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AM33XX Power Management Routines
+ *
+ * Copyright (C) 2012-2018 Texas Instruments Incorporated - http://www.ti.com/
+ *	Vaibhav Bedia, Dave Gerlach
+ */
+
+#include <linux/cpu.h>
+#include <linux/err.h>
+#include <linux/genalloc.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_data/pm33xx.h>
+#include <linux/platform_device.h>
+#include <linux/sizes.h>
+#include <linux/sram.h>
+#include <linux/suspend.h>
+#include <linux/ti-emif-sram.h>
+#include <linux/wkup_m3_ipc.h>
+
+#include <asm/proc-fns.h>
+#include <asm/suspend.h>
+#include <asm/system_misc.h>
+
+#define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
+					 (unsigned long)pm_sram->do_wfi)
+
+static int (*am33xx_do_wfi_sram)(unsigned long unused);
+static phys_addr_t am33xx_do_wfi_sram_phys;
+
+static struct gen_pool *sram_pool, *sram_pool_data;
+static unsigned long ocmcram_location, ocmcram_location_data;
+
+static struct am33xx_pm_platform_data *pm_ops;
+static struct am33xx_pm_sram_addr *pm_sram;
+
+static struct device *pm33xx_dev;
+static struct wkup_m3_ipc *m3_ipc;
+
+static u32 sram_suspend_address(unsigned long addr)
+{
+	return ((unsigned long)am33xx_do_wfi_sram +
+		AMX3_PM_SRAM_SYMBOL_OFFSET(addr));
+}
+
+#ifdef CONFIG_SUSPEND
+static int am33xx_pm_suspend(suspend_state_t suspend_state)
+{
+	int i, ret = 0;
+
+	ret = pm_ops->soc_suspend((unsigned long)suspend_state,
+				  am33xx_do_wfi_sram);
+
+	if (ret) {
+		dev_err(pm33xx_dev, "PM: Kernel suspend failure\n");
+	} else {
+		i = m3_ipc->ops->request_pm_status(m3_ipc);
+
+		switch (i) {
+		case 0:
+			dev_info(pm33xx_dev,
+				 "PM: Successfully put all powerdomains to target state\n");
+			break;
+		case 1:
+			dev_err(pm33xx_dev,
+				"PM: Could not transition all powerdomains to target state\n");
+			ret = -1;
+			break;
+		default:
+			dev_err(pm33xx_dev,
+				"PM: CM3 returned unknown result = %d\n", i);
+			ret = -1;
+		}
+	}
+
+	return ret;
+}
+
+static int am33xx_pm_enter(suspend_state_t suspend_state)
+{
+	int ret = 0;
+
+	switch (suspend_state) {
+	case PM_SUSPEND_MEM:
+	case PM_SUSPEND_STANDBY:
+		ret = am33xx_pm_suspend(suspend_state);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int am33xx_pm_begin(suspend_state_t state)
+{
+	int ret = -EINVAL;
+
+	switch (state) {
+	case PM_SUSPEND_MEM:
+		ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_DEEPSLEEP);
+		break;
+	case PM_SUSPEND_STANDBY:
+		ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_STANDBY);
+		break;
+	}
+
+	return ret;
+}
+
+static void am33xx_pm_end(void)
+{
+	m3_ipc->ops->finish_low_power(m3_ipc);
+}
+
+static int am33xx_pm_valid(suspend_state_t state)
+{
+	switch (state) {
+	case PM_SUSPEND_STANDBY:
+	case PM_SUSPEND_MEM:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+static const struct platform_suspend_ops am33xx_pm_ops = {
+	.begin		= am33xx_pm_begin,
+	.end		= am33xx_pm_end,
+	.enter		= am33xx_pm_enter,
+	.valid		= am33xx_pm_valid,
+};
+#endif /* CONFIG_SUSPEND */
+
+static void am33xx_pm_set_ipc_ops(void)
+{
+	u32 resume_address;
+	int temp;
+
+	temp = ti_emif_get_mem_type();
+	if (temp < 0) {
+		dev_err(pm33xx_dev, "PM: Cannot determine memory type, no PM available\n");
+		return;
+	}
+	m3_ipc->ops->set_mem_type(m3_ipc, temp);
+
+	/* Physical resume address to be used by ROM code */
+	resume_address = am33xx_do_wfi_sram_phys +
+			 *pm_sram->resume_offset + 0x4;
+
+	m3_ipc->ops->set_resume_address(m3_ipc, (void *)resume_address);
+}
+
+static void am33xx_pm_free_sram(void)
+{
+	gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz);
+	gen_pool_free(sram_pool_data, ocmcram_location_data,
+		      sizeof(struct am33xx_pm_ro_sram_data));
+}
+
+/*
+ * Push the minimal suspend-resume code to SRAM
+ */
+static int am33xx_pm_alloc_sram(void)
+{
+	struct device_node *np;
+	int ret = 0;
+
+	np = of_find_compatible_node(NULL, NULL, "ti,omap3-mpu");
+	if (!np) {
+		np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
+		if (!np) {
+			dev_err(pm33xx_dev, "PM: %s: Unable to find device node for mpu\n",
+				__func__);
+			return -ENODEV;
+		}
+	}
+
+	sram_pool = of_gen_pool_get(np, "pm-sram", 0);
+	if (!sram_pool) {
+		dev_err(pm33xx_dev, "PM: %s: Unable to get sram pool for ocmcram\n",
+			__func__);
+		ret = -ENODEV;
+		goto mpu_put_node;
+	}
+
+	sram_pool_data = of_gen_pool_get(np, "pm-sram", 1);
+	if (!sram_pool_data) {
+		dev_err(pm33xx_dev, "PM: %s: Unable to get sram data pool for ocmcram\n",
+			__func__);
+		ret = -ENODEV;
+		goto mpu_put_node;
+	}
+
+	ocmcram_location = gen_pool_alloc(sram_pool, *pm_sram->do_wfi_sz);
+	if (!ocmcram_location) {
+		dev_err(pm33xx_dev, "PM: %s: Unable to allocate memory from ocmcram\n",
+			__func__);
+		ret = -ENOMEM;
+		goto mpu_put_node;
+	}
+
+	ocmcram_location_data = gen_pool_alloc(sram_pool_data,
+					       sizeof(struct emif_regs_amx3));
+	if (!ocmcram_location_data) {
+		dev_err(pm33xx_dev, "PM: Unable to allocate memory from ocmcram\n");
+		gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz);
+		ret = -ENOMEM;
+	}
+
+mpu_put_node:
+	of_node_put(np);
+	return ret;
+}
+
+static int am33xx_push_sram_idle(void)
+{
+	struct am33xx_pm_ro_sram_data ro_sram_data;
+	int ret;
+	u32 table_addr, ro_data_addr;
+	void *copy_addr;
+
+	ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data;
+	ro_sram_data.amx3_pm_sram_data_phys =
+		gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data);
+
+	/* Save physical address to calculate resume offset during pm init */
+	am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool,
+							ocmcram_location);
+
+	am33xx_do_wfi_sram = sram_exec_copy(sram_pool, (void *)ocmcram_location,
+					    pm_sram->do_wfi,
+					    *pm_sram->do_wfi_sz);
+	if (!am33xx_do_wfi_sram) {
+		dev_err(pm33xx_dev,
+			"PM: %s: am33xx_do_wfi copy to sram failed\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	table_addr =
+		sram_suspend_address((unsigned long)pm_sram->emif_sram_table);
+	ret = ti_emif_copy_pm_function_table(sram_pool, (void *)table_addr);
+	if (ret) {
+		dev_dbg(pm33xx_dev,
+			"PM: %s: EMIF function copy failed\n", __func__);
+		return -EPROBE_DEFER;
+	}
+
+	ro_data_addr =
+		sram_suspend_address((unsigned long)pm_sram->ro_sram_data);
+	copy_addr = sram_exec_copy(sram_pool, (void *)ro_data_addr,
+				   &ro_sram_data,
+				   sizeof(ro_sram_data));
+	if (!copy_addr) {
+		dev_err(pm33xx_dev,
+			"PM: %s: ro_sram_data copy to sram failed\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int am33xx_pm_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	if (!of_machine_is_compatible("ti,am33xx") &&
+	    !of_machine_is_compatible("ti,am43"))
+		return -ENODEV;
+
+	pm_ops = dev->platform_data;
+	if (!pm_ops) {
+		dev_err(dev, "PM: Cannot get core PM ops!\n");
+		return -ENODEV;
+	}
+
+	pm_sram = pm_ops->get_sram_addrs();
+	if (!pm_sram) {
+		dev_err(dev, "PM: Cannot get PM asm function addresses!!\n");
+		return -ENODEV;
+	}
+
+	pm33xx_dev = dev;
+
+	ret = am33xx_pm_alloc_sram();
+	if (ret)
+		return ret;
+
+	ret = am33xx_push_sram_idle();
+	if (ret)
+		goto err_free_sram;
+
+	m3_ipc = wkup_m3_ipc_get();
+	if (!m3_ipc) {
+		dev_dbg(dev, "PM: Cannot get wkup_m3_ipc handle\n");
+		ret = -EPROBE_DEFER;
+		goto err_free_sram;
+	}
+
+	am33xx_pm_set_ipc_ops();
+
+#ifdef CONFIG_SUSPEND
+	suspend_set_ops(&am33xx_pm_ops);
+#endif /* CONFIG_SUSPEND */
+
+	ret = pm_ops->init();
+	if (ret) {
+		dev_err(dev, "Unable to call core pm init!\n");
+		ret = -ENODEV;
+		goto err_put_wkup_m3_ipc;
+	}
+
+	return 0;
+
+err_put_wkup_m3_ipc:
+	wkup_m3_ipc_put(m3_ipc);
+err_free_sram:
+	am33xx_pm_free_sram();
+	pm33xx_dev = NULL;
+	return ret;
+}
+
+static int am33xx_pm_remove(struct platform_device *pdev)
+{
+	suspend_set_ops(NULL);
+	wkup_m3_ipc_put(m3_ipc);
+	am33xx_pm_free_sram();
+	return 0;
+}
+
+static struct platform_driver am33xx_pm_driver = {
+	.driver = {
+		.name   = "pm33xx",
+	},
+	.probe = am33xx_pm_probe,
+	.remove = am33xx_pm_remove,
+};
+module_platform_driver(am33xx_pm_driver);
+
+MODULE_ALIAS("platform:pm33xx");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("am33xx power management driver");

include/linux/platform_data/pm33xx.h

@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * TI pm33xx platform data
+ *
+ * Copyright (C) 2016-2018 Texas Instruments, Inc.
+ *	Dave Gerlach <d-gerlach@ti.com>
+ */
+
+#ifndef _LINUX_PLATFORM_DATA_PM33XX_H
+#define _LINUX_PLATFORM_DATA_PM33XX_H
+
+#include <linux/kbuild.h>
+#include <linux/types.h>
+
+#ifndef __ASSEMBLER__
+struct am33xx_pm_sram_addr {
+	void (*do_wfi)(void);
+	unsigned long *do_wfi_sz;
+	unsigned long *resume_offset;
+	unsigned long *emif_sram_table;
+	unsigned long *ro_sram_data;
+};
+
+struct am33xx_pm_platform_data {
+	int	(*init)(void);
+	int	(*soc_suspend)(unsigned int state, int (*fn)(unsigned long));
+	struct  am33xx_pm_sram_addr *(*get_sram_addrs)(void);
+};
+
+struct am33xx_pm_sram_data {
+	u32 wfi_flags;
+	u32 l2_aux_ctrl_val;
+	u32 l2_prefetch_ctrl_val;
+} __packed __aligned(8);
+
+struct am33xx_pm_ro_sram_data {
+	u32 amx3_pm_sram_data_virt;
+	u32 amx3_pm_sram_data_phys;
+} __packed __aligned(8);
+
+#endif /* __ASSEMBLER__ */
+#endif /* _LINUX_PLATFORM_DATA_PM33XX_H */