[PATCH v2 3/5] ARM: OMAP2+: pm33xx-core: Add platform code needed for PM

Dave Gerlach
2017-05-19T20:05:51Z

Most of the PM code needed for am335x and am437x can be moved into a
module under drivers but some core code must remain in mach-omap2 at the
moment. This includes some internal clockdomain APIs and low-level ARM
APIs which are also not exported for use by modules.

Implement a few functions that handle these low-level platform
operations can be passed to the pm33xx module through the use of
platform data.

In addition to this, to be able to share data structures between C and
the sleep33xx and sleep43xx assembly code, we can automatically generate
all of the C struct member offsets and sizes as macros by making use of
the ARM asm-offsets file. In the same header that we define our data
structures in we also define all the macros in an inline function and by
adding a call to this in the asm_offsets file all macros are properly
generated and available to the assembly code without cluttering up the
asm-offsets file.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
---
arch/arm/kernel/asm-offsets.c | 2 +
arch/arm/mach-omap2/Kconfig | 1 +
arch/arm/mach-omap2/Makefile | 4 +
arch/arm/mach-omap2/pm.h | 5 +
arch/arm/mach-omap2/pm33xx-core.c | 181 +++++++++++++++++++++++++++++++++++
include/linux/platform_data/pm33xx.h | 69 +++++++++++++
6 files changed, 262 insertions(+)
create mode 100644 arch/arm/mach-omap2/pm33xx-core.c
create mode 100644 include/linux/platform_data/pm33xx.h

diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index d728b5660e36..62253e7bfac4 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -28,6 +28,7 @@
#include <asm/vdso_datapage.h>
#include <asm/hardware/cache-l2x0.h>
#include <linux/kbuild.h>
+#include <linux/platform_data/pm33xx.h>
#include <linux/ti-emif-sram.h>

/*
@@ -187,6 +188,7 @@ int main(void)
#if defined(CONFIG_SOC_AM33XX) || defined(CONFIG_SOC_AM43XX)
BLANK();
ti_emif_offsets();
+ amx3_pm_asm_offsets();
#endif

return 0;
diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 0465338183c7..940173fa0992 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/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"
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index c89757abb0ae..8475ae3f9ff1 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/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

diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index b668719b9b25..2f9649b89053 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -81,6 +81,11 @@ extern unsigned int omap3_do_wfi_sz;
/* ... and its pointer from SRAM after copy */
extern void (*omap3_do_wfi_sram)(void);

+struct am33xx_pm_platform_data *am33xx_pm_get_pdata(void);
+
+extern struct am33xx_pm_sram_addr am33xx_pm_sram;
+extern struct am33xx_pm_sram_addr am43xx_pm_sram;
+
/* save_secure_ram_context function pointer and size, for copy to SRAM */
extern int save_secure_ram_context(u32 *addr);
extern unsigned int save_secure_ram_context_sz;
diff --git a/arch/arm/mach-omap2/pm33xx-core.c b/arch/arm/mach-omap2/pm33xx-core.c
new file mode 100644
index 000000000000..c84ffc4de2e9
--- /dev/null
+++ b/arch/arm/mach-omap2/pm33xx-core.c
@@ -0,0 +1,181 @@
+/*
+ * AM33XX Arch Power Management Routines
+ *
+ * Copyright (C) 2016-2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Dave Gerlach
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/smp_scu.h>
+#include <asm/suspend.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,
+};
+
+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;
+}
diff --git a/include/linux/platform_data/pm33xx.h b/include/linux/platform_data/pm33xx.h
new file mode 100644
index 000000000000..c191ab681093
--- /dev/null
+++ b/include/linux/platform_data/pm33xx.h
@@ -0,0 +1,69 @@
+/*
+ * TI pm33xx platform data
+ *
+ * Copyright (C) 2016-2017 Texas Instruments, Inc.
+ * Dave Gerlach <d-gerlach@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _LINUX_PLATFORM_DATA_PM33XX_H
+#define _LINUX_PLATFORM_DATA_PM33XX_H
+
+#include <linux/kbuild.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;
+};
+
+struct am33xx_pm_ro_sram_data {
+ u32 amx3_pm_sram_data_virt;
+ u32 amx3_pm_sram_data_phys;
+};
+
+extern inline void amx3_pm_asm_offsets(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));
+}
+
+#endif /* __ASSEMBLER__ */
+#endif /* _LINUX_PLATFORM_DATA_PM33XX_H */
--
2.13.0