Tegra114: Initialize System Counter (TSC) with osc frequency

T114 needs the SYSCTR0 counter initialized so the TSC can be
read by the kernel. Do it in the bootloader since it's a write-once
deal (secure/non-secure mode dependent).

Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>

4 files changed, 33 insertions, 0 deletions

diff --git a/arch/arm/cpu/tegra-common/clock.c b/arch/arm/cpu/tegra-common/clock.c
index 49a06334cb..9156d009b2 100644
--- a/arch/arm/cpu/tegra-common/clock.c
+++ b/arch/arm/cpu/tegra-common/clock.c
@@ -557,4 +557,7 @@ void clock_init(void)
 	debug("PLLP = %d\n", pll_rate[CLOCK_ID_PERIPH]);
 	debug("PLLC = %d\n", pll_rate[CLOCK_ID_CGENERAL]);
 	debug("PLLX = %d\n", pll_rate[CLOCK_ID_XCPU]);
+
+	/* Do any special system timer/TSC setup */
+	arch_timer_init();
 }
diff --git a/arch/arm/cpu/tegra114-common/clock.c b/arch/arm/cpu/tegra114-common/clock.c
index 9b29ce1dd2..5c4305a418 100644
--- a/arch/arm/cpu/tegra114-common/clock.c
+++ b/arch/arm/cpu/tegra114-common/clock.c
@@ -19,6 +19,7 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
+#include <asm/arch/sysctr.h>
 #include <asm/arch/tegra.h>
 #include <asm/arch-tegra/clk_rst.h>
 #include <asm/arch-tegra/timer.h>
@@ -653,3 +654,24 @@ void clock_early_init(void)
 	writel(0x40000C10, &clkrst->crc_pll[CLOCK_ID_DISPLAY].pll_misc);
 	udelay(2);
 }
+
+void arch_timer_init(void)
+{
+	struct sysctr_ctlr *sysctr = (struct sysctr_ctlr *)NV_PA_TSC_BASE;
+	u32 freq, val;
+
+	freq = clock_get_rate(CLOCK_ID_OSC);
+	debug("%s: osc freq is %dHz [0x%08X]\n", __func__, freq, freq);
+
+	/* ARM CNTFRQ */
+	asm("mcr p15, 0, %0, c14, c0, 0\n" : : "r" (freq));
+
+	/* Only T114 has the System Counter regs */
+	debug("%s: setting CNTFID0 to 0x%08X\n", __func__, freq);
+	writel(freq, &sysctr->cntfid0);
+
+	val = readl(&sysctr->cntcr);
+	val |= TSC_CNTCR_ENABLE | TSC_CNTCR_HDBG;
+	writel(val, &sysctr->cntcr);
+	debug("%s: TSC CNTCR = 0x%08X\n", __func__, val);
+}
diff --git a/arch/arm/cpu/tegra20-common/clock.c b/arch/arm/cpu/tegra20-common/clock.c
index ec93894f48..4afb205c31 100644
--- a/arch/arm/cpu/tegra20-common/clock.c
+++ b/arch/arm/cpu/tegra20-common/clock.c
@@ -559,3 +559,7 @@ void clock_early_init(void)
 		break;
 	}
 }
+
+void arch_timer_init(void)
+{
+}
diff --git a/arch/arm/cpu/tegra30-common/clock.c b/arch/arm/cpu/tegra30-common/clock.c
index a93f2c9434..74bd22be1a 100644
--- a/arch/arm/cpu/tegra30-common/clock.c
+++ b/arch/arm/cpu/tegra30-common/clock.c
@@ -616,3 +616,7 @@ void clock_early_init(void)
 		break;
 	}
 }
+
+void arch_timer_init(void)
+{
+}