[PATCH] ARM: shmobile: r8a7740: Add Suspend-To-RAM modes and CPUIdle
Bastian Hecht
hechtb at gmail.com
Wed Apr 10 11:51:47 EDT 2013
We add 2 sleep modes and register a CPUIdle driver that uses them.
- A3SM PLL0 on/off: Power domain A3SM that contains the ARM core
and the 2nd level cache with either PLL0 on
or off
As the suspend to memory mechanism we use A3SM PLL off.
The setup of the SYSC regarding the external IRQs is taken from
pm-sh7372.c from Magnus Damm.
Signed-off-by: Bastian Hecht <hechtb+renesas at gmail.com>
---
Ok I need to add some remarks here:
First this patch relies on a fix I've sent out today:
"ARM: hw_breakpoint: Do not use __cpuinitdata for dbg_cpu_pm_nb"
Without it we can't use suspend at all without a kernel panic.
Next you can test this in two ways:
Either add IRQF_NO_SUSPEND to the touchscreen driver st1232 at IRQ registration
(hack) or extend the irqpin driver to support wakeup devices properly, meaning
adding suspend and resume callbacks that handle it (proper way). Or you can add
no_console_suspend to the boot options in r8a7740-armadillo800eva.dts. This way
you can use the serial console as wakeup device.
arch/arm/mach-shmobile/Makefile | 2 +-
arch/arm/mach-shmobile/include/mach/r8a7740.h | 2 +
arch/arm/mach-shmobile/pm-r8a7740.c | 220 ++++++++++++++++++++++++-
arch/arm/mach-shmobile/sleep-r8a7740.S | 68 ++++++++
4 files changed, 289 insertions(+), 3 deletions(-)
create mode 100644 arch/arm/mach-shmobile/sleep-r8a7740.S
diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile
index 068f1da..0568894 100644
--- a/arch/arm/mach-shmobile/Makefile
+++ b/arch/arm/mach-shmobile/Makefile
@@ -30,7 +30,7 @@ obj-$(CONFIG_SUSPEND) += suspend.o
obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_ARCH_SHMOBILE) += pm-rmobile.o
obj-$(CONFIG_ARCH_SH7372) += pm-sh7372.o sleep-sh7372.o
-obj-$(CONFIG_ARCH_R8A7740) += pm-r8a7740.o
+obj-$(CONFIG_ARCH_R8A7740) += pm-r8a7740.o sleep-r8a7740.o
obj-$(CONFIG_ARCH_R8A7779) += pm-r8a7779.o
obj-$(CONFIG_ARCH_SH73A0) += pm-sh73a0.o
diff --git a/arch/arm/mach-shmobile/include/mach/r8a7740.h b/arch/arm/mach-shmobile/include/mach/r8a7740.h
index abdc4d4..ba4707b 100644
--- a/arch/arm/mach-shmobile/include/mach/r8a7740.h
+++ b/arch/arm/mach-shmobile/include/mach/r8a7740.h
@@ -540,6 +540,8 @@ extern void r8a7740_add_standard_devices(void);
extern void r8a7740_clock_init(u8 md_ck);
extern void r8a7740_pinmux_init(void);
extern void r8a7740_pm_init(void);
+extern void r8a7740_resume(void);
+extern void r8a7740_shutdown(void);
#ifdef CONFIG_PM
extern void __init r8a7740_init_pm_domains(void);
diff --git a/arch/arm/mach-shmobile/pm-r8a7740.c b/arch/arm/mach-shmobile/pm-r8a7740.c
index 40b87aa..d4613f0 100644
--- a/arch/arm/mach-shmobile/pm-r8a7740.c
+++ b/arch/arm/mach-shmobile/pm-r8a7740.c
@@ -8,10 +8,54 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
+#include <linux/bitrev.h>
#include <linux/console.h>
+#include <linux/cpuidle.h>
+#include <linux/module.h>
#include <linux/suspend.h>
+#include <linux/io.h>
+#include <asm/suspend.h>
+#include <asm/cacheflush.h>
+#include <asm/cpuidle.h>
+#include <asm/hardware/cache-l2x0.h>
#include <mach/pm-rmobile.h>
#include <mach/common.h>
+#include <mach/r8a7740.h>
+
+/* CPGA */
+#define PLLC01STPCR IOMEM(0xe61500c8)
+#define SYSTBCR IOMEM(0xe6150024)
+
+/* SYSC */
+#define STBCHR IOMEM(0xe6180000)
+#define STBCHRB IOMEM(0xe6180040)
+#define SPDCR IOMEM(0xe6180008)
+#define SBAR IOMEM(0xe6180020)
+#define SRSTFR IOMEM(0xe61800B4)
+#define WUPSMSK IOMEM(0xe618002c)
+#define WUPSMSK2 IOMEM(0xe6180048)
+#define WUPSFAC IOMEM(0xe6180098)
+#define IRQCR IOMEM(0xe618022c)
+#define IRQCR2 IOMEM(0xe6180238)
+#define IRQCR3 IOMEM(0xe6180244)
+#define IRQCR4 IOMEM(0xe6180248)
+
+/* SRSTFR flags */
+#define RAMST (1 << 19)
+#define RCLNKA (1 << 7)
+#define RCPRES (1 << 5)
+#define RCWD1 (1 << 4)
+#define RPF (1 << 0)
+
+/* INTC */
+#define ICR1A IOMEM(0xe6900000)
+#define ICR2A IOMEM(0xe6900004)
+#define ICR3A IOMEM(0xe6900008)
+#define ICR4A IOMEM(0xe690000c)
+#define INTMSK00A IOMEM(0xe6900040)
+#define INTMSK10A IOMEM(0xe6900044)
+#define INTMSK20A IOMEM(0xe6900048)
+#define INTMSK30A IOMEM(0xe690004c)
#ifdef CONFIG_PM
static int r8a7740_pd_a4s_suspend(void)
@@ -58,12 +102,183 @@ void __init r8a7740_init_pm_domains(void)
rmobile_init_domains(r8a7740_pm_domains, ARRAY_SIZE(r8a7740_pm_domains));
pm_genpd_add_subdomain_names("A4S", "A3SP");
}
-
#endif /* CONFIG_PM */
+#if defined(CONFIG_SUSPEND) || defined(CONFIG_CPU_IDLE)
+static void r8a7740_set_reset_vector(unsigned long address)
+{
+ __raw_writel(address, SBAR);
+}
+
+static void r8a7740_icr_to_irqcr(unsigned long icr, u16 *irqcr1p, u16 *irqcr2p)
+{
+ u16 tmp, irqcr1, irqcr2;
+ int k;
+
+ irqcr1 = 0;
+ irqcr2 = 0;
+
+ /* convert INTCA ICR register layout to SYSC IRQCR+IRQCR2 */
+ for (k = 0; k <= 7; k++) {
+ tmp = (icr >> ((7 - k) * 4)) & 0xf;
+ irqcr1 |= (tmp & 0x03) << (k * 2);
+ irqcr2 |= (tmp >> 2) << (k * 2);
+ }
+
+ *irqcr1p = irqcr1;
+ *irqcr2p = irqcr2;
+}
+
+static void r8a7740_setup_sysc(unsigned long msk, unsigned long msk2)
+{
+ u16 irqcrx_low, irqcrx_high, irqcry_low, irqcry_high;
+ unsigned long tmp;
+
+ /* read IRQ0A -> IRQ15A mask */
+ tmp = bitrev8(__raw_readb(INTMSK00A));
+ tmp |= bitrev8(__raw_readb(INTMSK10A)) << 8;
+
+ /* setup WUPSMSK from clocks and external IRQ mask */
+ msk = (~msk & 0xc030000f) | (tmp << 4);
+ __raw_writel(msk, WUPSMSK);
+
+ /* propage level/edge trigger for external IRQ 0->15 */
+ r8a7740_icr_to_irqcr(__raw_readl(ICR1A), &irqcrx_low, &irqcry_low);
+ r8a7740_icr_to_irqcr(__raw_readl(ICR2A), &irqcrx_high, &irqcry_high);
+ __raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR);
+ __raw_writel((irqcry_high << 16) | irqcry_low, IRQCR2);
+
+ /* read IRQ16A -> IRQ31A mask */
+ tmp = bitrev8(__raw_readb(INTMSK20A));
+ tmp |= bitrev8(__raw_readb(INTMSK30A)) << 8;
+
+ /* setup WUPSMSK2 from clocks and external IRQ mask */
+ msk2 = (~msk2 & 0x00030000) | tmp;
+ __raw_writel(msk2, WUPSMSK2);
+
+ /* propage level/edge trigger for external IRQ 16->31 */
+ r8a7740_icr_to_irqcr(__raw_readl(ICR3A), &irqcrx_low, &irqcry_low);
+ r8a7740_icr_to_irqcr(__raw_readl(ICR4A), &irqcrx_high, &irqcry_high);
+ __raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR3);
+ __raw_writel((irqcry_high << 16) | irqcry_low, IRQCR4);
+}
+
+static void r8a7740_prepare_wakeup(void)
+{
+ /* clear all flags that lead to a cold boot */
+ __raw_writel(~(RAMST | RCLNKA | RCPRES | RCWD1 | RPF), SRSTFR);
+ /* indicate warm boot */
+ __raw_writel(0x80000000, STBCHRB);
+ /* clear other flags checked by internal ROM boot loader */
+ __raw_writel(0x00000000, STBCHR);
+}
+
+static int r8a7740_do_suspend(unsigned long unused)
+{
+ /*
+ * cpu_suspend() guarantees that all data made it to the L2.
+ * Flush it out now and disable the cache controller.
+ */
+ outer_flush_all();
+ outer_disable();
+
+ r8a7740_shutdown();
+
+ /* in case WFI fails to enter the low power state, restore things */
+ outer_resume();
+
+ return 0;
+}
+
+static void r8a7740_enter_a3sm_common(int pllc0_on)
+{
+ u32 reg32;
+
+ if (pllc0_on)
+ __raw_writel(0, PLLC01STPCR);
+ else
+ __raw_writel(1 << 28, PLLC01STPCR);
+
+ r8a7740_set_reset_vector(__pa(r8a7740_resume));
+ r8a7740_prepare_wakeup();
+ r8a7740_setup_sysc(1 << 0, 0);
+
+ /* Activate delayed shutdown of A3SM */
+ reg32 = __raw_readl(SPDCR);
+ reg32 |= (1 << 31) | (1 << 12);
+ __raw_writel(reg32, SPDCR);
+
+ /* We activate CPU Core Standby as well here */
+ reg32 = __raw_readl(SYSTBCR);
+ reg32 |= (1 << 4);
+ __raw_writel(reg32, SYSTBCR);
+
+ /* Clear Wakeup Factors and do suspend */
+ reg32 = __raw_readl(WUPSFAC);
+ cpu_suspend(0, r8a7740_do_suspend);
+ outer_resume();
+ reg32 = __raw_readl(WUPSFAC);
+
+ /* Clear CPU Core Standby flag for other WFI instructions */
+ reg32 &= ~(1 << 4);
+ __raw_writel(reg32, SYSTBCR);
+
+}
+#endif /* CONFIG_SUSPEND || CONFIG_CPU_IDLE */
+
+#ifdef CONFIG_CPU_IDLE
+static int r8a7740_enter_a3sm_pll_on(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ r8a7740_enter_a3sm_common(1);
+ return 1;
+}
+
+static int r8a7740_enter_a3sm_pll_off(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ r8a7740_enter_a3sm_common(0);
+ return 2;
+}
+
+static struct cpuidle_driver r8a7740_cpuidle_driver = {
+ .name = "r8a7740_cpuidle",
+ .owner = THIS_MODULE,
+ .en_core_tk_irqen = 1,
+ .state_count = 3,
+ .safe_state_index = 0, /* C1 */
+ .states[0] = ARM_CPUIDLE_WFI_STATE,
+ .states[0].enter = shmobile_enter_wfi,
+ .states[1] = {
+ .name = "C2",
+ .desc = "A3SM PLL ON",
+ .exit_latency = 40,
+ .target_residency = 30 + 40,
+ .flags = CPUIDLE_FLAG_TIME_VALID,
+ .enter = r8a7740_enter_a3sm_pll_on,
+ },
+ .states[2] = {
+ .name = "C3",
+ .desc = "A3SM PLL OFF",
+ .exit_latency = 120,
+ .target_residency = 30 + 120,
+ .flags = CPUIDLE_FLAG_TIME_VALID,
+ .enter = r8a7740_enter_a3sm_pll_off,
+ },
+};
+
+static void r8a7740_cpuidle_init(void)
+{
+ shmobile_cpuidle_set_driver(&r8a7740_cpuidle_driver);
+}
+#else
+static void r8a7740_cpuidle_init(void) {}
+#endif /* CONFIG_CPU_IDLE */
+
#ifdef CONFIG_SUSPEND
static int r8a7740_enter_suspend(suspend_state_t suspend_state)
{
+ r8a7740_enter_a3sm_common(0);
cpu_do_idle();
return 0;
}
@@ -74,9 +289,10 @@ static void r8a7740_suspend_init(void)
}
#else
static void r8a7740_suspend_init(void) {}
-#endif
+#endif /* CONFIG_SUSPEND */
void __init r8a7740_pm_init(void)
{
r8a7740_suspend_init();
+ r8a7740_cpuidle_init();
}
diff --git a/arch/arm/mach-shmobile/sleep-r8a7740.S b/arch/arm/mach-shmobile/sleep-r8a7740.S
new file mode 100644
index 0000000..0ae310d
--- /dev/null
+++ b/arch/arm/mach-shmobile/sleep-r8a7740.S
@@ -0,0 +1,68 @@
+/*
+ * Low level sleep code for the SoC r8a7740
+ *
+ * Copyright (C) 2013 Bastian Hecht
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/memory.h>
+
+#if defined(CONFIG_SUSPEND) || defined(CONFIG_CPU_IDLE)
+
+/* r8a7740_shutdown expects L1 and L2 to be flushed */
+ .text
+ENTRY(r8a7740_shutdown)
+ stmfd sp!, {r4-r12, lr}
+
+ /* make sure the stack stays intact */
+ bl v7_flush_dcache_all
+
+ /*
+ * 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
+
+ bl v7_flush_dcache_all
+ bl cpu_v7_do_idle
+
+ /* in rare cases when WFI fails we end up here and restore things */
+ mrc p15, 0, r0, c1, c0, 0
+ orr r0, r0, #(1 << 2) @ Enable the C bit
+ mcr p15, 0, r0, c1, c0, 0
+ isb
+
+ ldmfd sp!, {r4-r12, pc}
+ENDPROC(r8a7740)
+
+ .text
+ENTRY(v7_cpu_resume)
+ bl v7_invalidate_l1
+ b cpu_resume
+ENDPROC(v7_cpu_resume)
+
+/*
+ * The entry point of a warm reboot, used by wakeup scenarios
+ *
+ * The CPU jumps in this case to (0xfffff000 & SBAR), so we need
+ * to align this function properly.
+ * We use a long jump into the text segment and use the physical
+ * address as the MMU is still turned off.
+ */
+ .align 12
+ .text
+ENTRY(r8a7740_resume)
+ ldr pc, 1f
+1: .long v7_cpu_resume - PAGE_OFFSET + PLAT_PHYS_OFFSET
+ENDPROC(r8a7740_resume_core_standby)
+#endif
--
1.7.9.5
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