From a1f1c7efb0c1c78b5e84455bb5a6c8b2bee3059c Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Tue, 6 Sep 2011 15:08:40 +0800 Subject: [PATCH] arm/imx6q: add suspend/resume support It adds suspend/resume support for imx6q. Signed-off-by: Anson Huang Signed-off-by: Shawn Guo --- arch/arm/mach-imx/Makefile | 2 +- arch/arm/mach-imx/head-v7.S | 28 +++++++++++++ arch/arm/mach-imx/pm-imx6q.c | 70 +++++++++++++++++++++++++++++++++ arch/arm/plat-mxc/include/mach/common.h | 9 +++++ 4 files changed, 108 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-imx/pm-imx6q.c diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile index 994ae82ca281..aba73214c2a8 100644 --- a/arch/arm/mach-imx/Makefile +++ b/arch/arm/mach-imx/Makefile @@ -70,4 +70,4 @@ AFLAGS_head-v7.o :=-Wa,-march=armv7-a obj-$(CONFIG_SMP) += platsmp.o obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o -obj-$(CONFIG_SOC_IMX6Q) += clock-imx6q.o mach-imx6q.o +obj-$(CONFIG_SOC_IMX6Q) += clock-imx6q.o mach-imx6q.o pm-imx6q.o diff --git a/arch/arm/mach-imx/head-v7.S b/arch/arm/mach-imx/head-v7.S index ede908bca7d5..6229efbc70cb 100644 --- a/arch/arm/mach-imx/head-v7.S +++ b/arch/arm/mach-imx/head-v7.S @@ -12,6 +12,7 @@ #include #include +#include #include .section ".text.head", "ax" @@ -69,3 +70,30 @@ ENTRY(v7_secondary_startup) b secondary_startup ENDPROC(v7_secondary_startup) #endif + +/* + * The following code is located into the .data section. This is to + * allow phys_l2x0_saved_regs to be accessed with a relative load + * as we are running on physical address here. + */ + .data + .align + + .macro pl310_resume + ldr r2, phys_l2x0_saved_regs + ldr r0, [r2, #L2X0_R_PHY_BASE] @ get physical base of l2x0 + ldr r1, [r2, #L2X0_R_AUX_CTRL] @ get aux_ctrl value + str r1, [r0, #L2X0_AUX_CTRL] @ restore aux_ctrl + mov r1, #0x1 + str r1, [r0, #L2X0_CTRL] @ re-enable L2 + .endm + +ENTRY(v7_cpu_resume) + bl v7_invalidate_l1 + pl310_resume + b cpu_resume +ENDPROC(v7_cpu_resume) + + .globl phys_l2x0_saved_regs +phys_l2x0_saved_regs: + .long 0 diff --git a/arch/arm/mach-imx/pm-imx6q.c b/arch/arm/mach-imx/pm-imx6q.c new file mode 100644 index 000000000000..f20f191d7cca --- /dev/null +++ b/arch/arm/mach-imx/pm-imx6q.c @@ -0,0 +1,70 @@ +/* + * Copyright 2011 Freescale Semiconductor, Inc. + * Copyright 2011 Linaro Ltd. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +extern unsigned long phys_l2x0_saved_regs; + +static int imx6q_suspend_finish(unsigned long val) +{ + cpu_do_idle(); + return 0; +} + +static int imx6q_pm_enter(suspend_state_t state) +{ + switch (state) { + case PM_SUSPEND_MEM: + imx6q_set_lpm(STOP_POWER_OFF); + imx_gpc_pre_suspend(); + imx_set_cpu_jump(0, v7_cpu_resume); + /* Zzz ... */ + cpu_suspend(0, imx6q_suspend_finish); + imx_smp_prepare(); + imx_gpc_post_resume(); + break; + default: + return -EINVAL; + } + + return 0; +} + +static const struct platform_suspend_ops imx6q_pm_ops = { + .enter = imx6q_pm_enter, + .valid = suspend_valid_only_mem, +}; + +void __init imx6q_pm_init(void) +{ + /* + * The l2x0 core code provides an infrastucture to save and restore + * l2x0 registers across suspend/resume cycle. But because imx6q + * retains L2 content during suspend and needs to resume L2 before + * MMU is enabled, it can only utilize register saving support and + * have to take care of restoring on its own. So we save physical + * address of the data structure used by l2x0 core to save registers, + * and later restore the necessary ones in imx6q resume entry. + */ + phys_l2x0_saved_regs = __pa(&l2x0_saved_regs); + + suspend_set_ops(&imx6q_pm_ops); +} diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h index 607b4623af0c..6a7d993a17a6 100644 --- a/arch/arm/plat-mxc/include/mach/common.h +++ b/arch/arm/plat-mxc/include/mach/common.h @@ -13,6 +13,7 @@ struct platform_device; struct clk; +enum mxc_cpu_pwr_mode; extern void mx1_map_io(void); extern void mx21_map_io(void); @@ -107,14 +108,22 @@ extern void imx_lluart_map_io(void); #else static inline void imx_lluart_map_io(void) {} #endif +extern void v7_cpu_resume(void); +extern u32 *pl310_get_save_ptr(void); #ifdef CONFIG_SMP extern void v7_secondary_startup(void); extern void imx_scu_map_io(void); +extern void imx_smp_prepare(void); #else static inline void imx_scu_map_io(void) {} +static inline void imx_smp_prepare(void) {} #endif extern void imx_enable_cpu(int cpu, bool enable); extern void imx_set_cpu_jump(int cpu, void *jump_addr); extern void imx_src_init(void); extern void imx_gpc_init(void); +extern void imx_gpc_pre_suspend(void); +extern void imx_gpc_post_resume(void); +extern int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode); +extern void imx6q_pm_init(void); #endif -- 2.11.0