ARM: mach-shmobile: sh7372 A3SM support
This patch adds sh7372 A3SM power domain support.
The sh7372 A3SM hardware power domain contains the
ARM Cortex-A8 CPU Core including L2 cache. This
sleep mode can be seen as a one step deeper sleep
mode from the already existing Core Standby mode.
To wake up from A3SM sleep only a few wakeup sources
are supported - so the regular INTC controller will
not be able to help us unfortunately.
The code in this patch will enter A3SM sleep via the
regular Suspend-to-RAM interface in the case of only
wakeups supported by A3SM are enabled. If unsupported
wakeups are enabled then Core Standby will be used
instead.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h
index 7b6f6f9..c0cdbf9 100644
--- a/arch/arm/mach-shmobile/include/mach/common.h
+++ b/arch/arm/mach-shmobile/include/mach/common.h
@@ -35,7 +35,8 @@
extern void sh7372_clock_init(void);
extern void sh7372_pinmux_init(void);
extern void sh7372_pm_init(void);
-extern void sh7372_resume_core_standby(void);
+extern void sh7372_resume_core_standby_a3sm(void);
+extern int sh7372_do_idle_a3sm(unsigned long unused);
extern struct clk sh7372_extal1_clk;
extern struct clk sh7372_extal2_clk;
diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
index aa7d352..444f42f 100644
--- a/arch/arm/mach-shmobile/pm-sh7372.c
+++ b/arch/arm/mach-shmobile/pm-sh7372.c
@@ -18,6 +18,8 @@
#include <linux/pm_clock.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/bitrev.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/tlbflush.h>
@@ -25,14 +27,48 @@
#include <mach/common.h>
#include <mach/sh7372.h>
-#define SMFRAM 0xe6a70000
-#define SYSTBCR 0xe6150024
-#define SBAR 0xe6180020
-#define APARMBAREA 0xe6f10020
+/* DBG */
+#define DBGREG1 0xe6100020
+#define DBGREG9 0xe6100040
+/* CPGA */
+#define SYSTBCR 0xe6150024
+#define MSTPSR0 0xe6150030
+#define MSTPSR1 0xe6150038
+#define MSTPSR2 0xe6150040
+#define MSTPSR3 0xe6150048
+#define MSTPSR4 0xe615004c
+#define PLLC01STPCR 0xe61500c8
+
+/* SYSC */
#define SPDCR 0xe6180008
#define SWUCR 0xe6180014
+#define SBAR 0xe6180020
+#define WUPSMSK 0xe618002c
+#define WUPSMSK2 0xe6180048
#define PSTR 0xe6180080
+#define WUPSFAC 0xe6180098
+#define IRQCR 0xe618022c
+#define IRQCR2 0xe6180238
+#define IRQCR3 0xe6180244
+#define IRQCR4 0xe6180248
+#define PDNSEL 0xe6180254
+
+/* INTC */
+#define ICR1A 0xe6900000
+#define ICR2A 0xe6900004
+#define ICR3A 0xe6900008
+#define ICR4A 0xe690000c
+#define INTMSK00A 0xe6900040
+#define INTMSK10A 0xe6900044
+#define INTMSK20A 0xe6900048
+#define INTMSK30A 0xe690004c
+
+/* MFIS */
+#define SMFRAM 0xe6a70000
+
+/* AP-System Core */
+#define APARMBAREA 0xe6f10020
#define PSTR_RETRIES 100
#define PSTR_DELAY_US 10
@@ -162,7 +198,7 @@
static void sh7372_enter_core_standby(void)
{
/* set reset vector, translate 4k */
- __raw_writel(__pa(sh7372_resume_core_standby), SBAR);
+ __raw_writel(__pa(sh7372_resume_core_standby_a3sm), SBAR);
__raw_writel(0, APARMBAREA);
/* enter sleep mode with SYSTBCR to 0x10 */
@@ -174,7 +210,151 @@
__raw_writel(0, SBAR);
}
+static void sh7372_enter_a3sm_common(int pllc0_on)
+{
+ /* set reset vector, translate 4k */
+ __raw_writel(__pa(sh7372_resume_core_standby_a3sm), SBAR);
+ __raw_writel(0, APARMBAREA);
+
+ if (pllc0_on)
+ __raw_writel(0, PLLC01STPCR);
+ else
+ __raw_writel(1 << 28, PLLC01STPCR);
+
+ __raw_writel(0, PDNSEL); /* power-down A3SM only, not A4S */
+ __raw_readl(WUPSFAC); /* read wakeup int. factor before sleep */
+ cpu_suspend(0, sh7372_do_idle_a3sm);
+ __raw_readl(WUPSFAC); /* read wakeup int. factor after wakeup */
+
+ /* disable reset vector translation */
+ __raw_writel(0, SBAR);
+}
+
+static int sh7372_a3sm_valid(unsigned long *mskp, unsigned long *msk2p)
+{
+ unsigned long mstpsr0, mstpsr1, mstpsr2, mstpsr3, mstpsr4;
+ unsigned long msk, msk2;
+
+ /* check active clocks to determine potential wakeup sources */
+
+ mstpsr0 = __raw_readl(MSTPSR0);
+ if ((mstpsr0 & 0x00000003) != 0x00000003) {
+ pr_debug("sh7372 mstpsr0 0x%08lx\n", mstpsr0);
+ return 0;
+ }
+
+ mstpsr1 = __raw_readl(MSTPSR1);
+ if ((mstpsr1 & 0xff079b7f) != 0xff079b7f) {
+ pr_debug("sh7372 mstpsr1 0x%08lx\n", mstpsr1);
+ return 0;
+ }
+
+ mstpsr2 = __raw_readl(MSTPSR2);
+ if ((mstpsr2 & 0x000741ff) != 0x000741ff) {
+ pr_debug("sh7372 mstpsr2 0x%08lx\n", mstpsr2);
+ return 0;
+ }
+
+ mstpsr3 = __raw_readl(MSTPSR3);
+ if ((mstpsr3 & 0x1a60f010) != 0x1a60f010) {
+ pr_debug("sh7372 mstpsr3 0x%08lx\n", mstpsr3);
+ return 0;
+ }
+
+ mstpsr4 = __raw_readl(MSTPSR4);
+ if ((mstpsr4 & 0x00008cf0) != 0x00008cf0) {
+ pr_debug("sh7372 mstpsr4 0x%08lx\n", mstpsr4);
+ return 0;
+ }
+
+ msk = 0;
+ msk2 = 0;
+
+ /* make bitmaps of limited number of wakeup sources */
+
+ if ((mstpsr2 & (1 << 23)) == 0) /* SPU2 */
+ msk |= 1 << 31;
+
+ if ((mstpsr2 & (1 << 12)) == 0) /* MFI_MFIM */
+ msk |= 1 << 21;
+
+ if ((mstpsr4 & (1 << 3)) == 0) /* KEYSC */
+ msk |= 1 << 2;
+
+ if ((mstpsr1 & (1 << 24)) == 0) /* CMT0 */
+ msk |= 1 << 1;
+
+ if ((mstpsr3 & (1 << 29)) == 0) /* CMT1 */
+ msk |= 1 << 1;
+
+ if ((mstpsr4 & (1 << 0)) == 0) /* CMT2 */
+ msk |= 1 << 1;
+
+ if ((mstpsr2 & (1 << 13)) == 0) /* MFI_MFIS */
+ msk2 |= 1 << 17;
+
+ *mskp = msk;
+ *msk2p = msk2;
+
+ return 1;
+}
+
+static void sh7372_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 sh7372_setup_a3sm(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 */
+ sh7372_icr_to_irqcr(__raw_readl(ICR1A), &irqcrx_low, &irqcry_low);
+ sh7372_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 */
+ sh7372_icr_to_irqcr(__raw_readl(ICR3A), &irqcrx_low, &irqcry_low);
+ sh7372_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);
+}
+
+
#ifdef CONFIG_CPU_IDLE
+
static void sh7372_cpuidle_setup(struct cpuidle_device *dev)
{
struct cpuidle_state *state;
@@ -202,9 +382,25 @@
#endif
#ifdef CONFIG_SUSPEND
+
static int sh7372_enter_suspend(suspend_state_t suspend_state)
{
- sh7372_enter_core_standby();
+ unsigned long msk, msk2;
+
+ /* check active clocks to determine potential wakeup sources */
+ if (sh7372_a3sm_valid(&msk, &msk2)) {
+
+ /* convert INTC mask and sense to SYSC mask and sense */
+ sh7372_setup_a3sm(msk, msk2);
+
+ /* enter A3SM sleep with PLLC0 off */
+ pr_debug("entering A3SM\n");
+ sh7372_enter_a3sm_common(0);
+ } else {
+ /* default to Core Standby that supports all wakeup sources */
+ pr_debug("entering Core Standby\n");
+ sh7372_enter_core_standby();
+ }
return 0;
}
@@ -216,9 +412,6 @@
static void sh7372_suspend_init(void) {}
#endif
-#define DBGREG1 0xe6100020
-#define DBGREG9 0xe6100040
-
void __init sh7372_pm_init(void)
{
/* enable DBG hardware block to kick SYSC */
diff --git a/arch/arm/mach-shmobile/sleep-sh7372.S b/arch/arm/mach-shmobile/sleep-sh7372.S
index dedf612..d365842 100644
--- a/arch/arm/mach-shmobile/sleep-sh7372.S
+++ b/arch/arm/mach-shmobile/sleep-sh7372.S
@@ -36,7 +36,58 @@
.align 12
.text
- .global sh7372_resume_core_standby
-sh7372_resume_core_standby:
+ .global sh7372_resume_core_standby_a3sm
+sh7372_resume_core_standby_a3sm:
ldr pc, 1f
1: .long cpu_resume - PAGE_OFFSET + PLAT_PHYS_OFFSET
+
+ .global sh7372_do_idle_a3sm
+sh7372_do_idle_a3sm:
+ /*
+ * 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
+
+ /* disable L2 cache in the aux control register */
+ mrc p15, 0, r10, c1, c0, 1
+ bic r10, r10, #2
+ mcr p15, 0, r10, c1, c0, 1
+
+ /*
+ * Invalidate data cache again.
+ */
+ ldr r1, kernel_flush
+ blx r1
+ /*
+ * The kernel doesn't interwork: v7_flush_dcache_all in particluar will
+ * always return in Thumb state when CONFIG_THUMB2_KERNEL is enabled.
+ * This sequence switches back to ARM. Note that .align may insert a
+ * nop: bx pc needs to be word-aligned in order to work.
+ */
+ THUMB( .thumb )
+ THUMB( .align )
+ THUMB( bx pc )
+ THUMB( nop )
+ .arm
+
+ /* Data memory barrier and Data sync barrier */
+ dsb
+ dmb
+
+#define SPDCR 0xe6180008
+#define A3SM (1 << 12)
+
+ /* A3SM power down */
+ ldr r0, =SPDCR
+ ldr r1, =A3SM
+ str r1, [r0]
+1:
+ b 1b
+
+kernel_flush:
+ .word v7_flush_dcache_all