blackfin: bf60x: pm: Add a debug option to calculate kernel wakeup time.

Display the total time when kernel resumes normal from standby or suspend to mem
mode.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>

arch/blackfin/Kconfig.debug

@@ -253,4 +253,11 @@ config BFIN_PSEUDODBG_INSNS
 
 	  Most people should say N here.
 
+config BFIN_PM_WAKEUP_TIME_BENCH
+	bool "Display the total time for kernel to resume from power saving mode"
+	default n
+	help
+	  Display the total time when kernel resumes normal from standby or
+	  suspend to mem mode.
+
 endmenu

arch/blackfin/include/asm/dpmc.h

@@ -53,6 +53,16 @@
 #define PM_SYS_PUSH16(n, x)     _PM_PUSH(n, x, w, SYSMMR_BASE)
 #define PM_SYS_POP16(n, x)      _PM_POP(n, x, w, SYSMMR_BASE)
 
+	.macro bfin_init_pm_bench_cycles
+#ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
+	R4 = 0;
+	CYCLES = R4;
+	CYCLES2 = R4;
+	R4 = SYSCFG;
+	BITSET(R4, 1);
+	SYSCFG = R4;
+#endif
+	.endm
 
 	.macro bfin_cpu_reg_save
 	/*
@@ -98,8 +108,10 @@
 	r7 = RETI;
 	[--sp] = RETS;
 	[--sp] = ASTAT;
+#ifndef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
 	[--sp] = CYCLES;
 	[--sp] = CYCLES2;
+#endif
 	[--sp] = SYSCFG;
 	[--sp] = RETX;
 	[--sp] = SEQSTAT;
@@ -115,8 +127,10 @@
 	SEQSTAT = [sp++];
 	RETX = [sp++];
 	SYSCFG = [sp++];
+#ifndef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
 	CYCLES2 = [sp++];
 	CYCLES = [sp++];
+#endif
 	ASTAT = [sp++];
 	RETS = [sp++];
 

arch/blackfin/mach-bf609/hibernate.S

@@ -24,6 +24,9 @@ ENTRY(_enter_hibernate)
 	P0.L = LO(DPM0_CTL);
 	R3.H = HI(0x00000010);
 	R3.L = LO(0x00000010);
+
+	bfin_init_pm_bench_cycles;
+
 	[P0] = R3;
 
 	SSYNC;

arch/blackfin/mach-bf609/pm.c

@@ -147,6 +147,18 @@ void bfin_deepsleep(unsigned long mask)
 			"idle;" \
 			: : \
 			);
+#ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
+	__asm__ __volatile__(
+		"%0 = 0;"
+		"CYCLES = %0;"
+		"CYCLES2 = %0;"
+		"%0 = SYSCFG;"
+		"BITSET(%0, 1);"
+		"SYSCFG = %0;"
+		: "=d,a" (dpm0_ctl) :
+	);
+#endif
+
 }
 
 __attribute__((l1_text))

arch/blackfin/mach-common/dpmc_modes.S

@@ -42,6 +42,9 @@ ENTRY(_sleep_mode)
 	BITCLR (R7, 5);
 	w[p0] = R7.L;
 	IDLE;
+
+	bfin_init_pm_bench_cycles;
+
 	call _test_pll_locked;
 
 	RETS = [SP++];
@@ -74,6 +77,9 @@ ENTRY(_hibernate_mode)
 
 	/* Finally, we climb into our cave to hibernate */
 	W[P3] = R4.L;
+
+	bfin_init_pm_bench_cycles;
+
 	CLI R2;
 	IDLE;
 .Lforever:
@@ -158,6 +164,8 @@ ENTRY(_sleep_deeper)
 	SSYNC;
 	IDLE;
 
+	bfin_init_pm_bench_cycles;
+
 	call _test_pll_locked;
 
 	P0.H = hi(PLL_DIV);

arch/blackfin/mach-common/pm.c

@@ -247,9 +247,39 @@ static int bfin_pm_enter(suspend_state_t state)
 	return 0;
 }
 
+#ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
+void bfin_pm_end(void)
+{
+	u32 cycle, cycle2;
+	u64 usec64;
+	u32 usec;
+
+	__asm__ __volatile__ (
+		"1: %0 = CYCLES2\n"
+		"%1 = CYCLES\n"
+		"%2 = CYCLES2\n"
+		"CC = %2 == %0\n"
+		"if ! CC jump 1b\n"
+		: "=d,a" (cycle2), "=d,a" (cycle), "=d,a" (usec) : : "CC"
+	);
+
+	usec64 = ((u64)cycle2 << 32) + cycle;
+	do_div(usec64, get_cclk() / USEC_PER_SEC);
+	usec = usec64;
+	if (usec == 0)
+		usec = 1;
+
+	pr_info("PM: resume of kernel completes after  %ld msec %03ld usec\n",
+		usec / USEC_PER_MSEC, usec % USEC_PER_MSEC);
+}
+#endif
+
 static const struct platform_suspend_ops bfin_pm_ops = {
 	.enter = bfin_pm_enter,
 	.valid	= bfin_pm_valid,
+#ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
+	.end = bfin_pm_end,
+#endif
 };
 
 static int __init bfin_pm_init(void)