[U-Boot] [PATCH v2] arm/kirkwood: print speeds with cpu info.

[Jason Cooper]

If CONFIG_DISPLAY_CPUINFO is enabled on kirkwood SoCs, this will print the
speeds of the various components.

Signed-off-by: Jason Cooper <u-boot at lakedaemon.net>
---
Changes since v1:
	- optimized macros to remove one-timers
	- reduced switch/case to if/else since it operates on one bit.
	- remove RFC

 arch/arm/cpu/arm926ejs/kirkwood/cpu.c    |   41 ++++++++++++++++++++++++++++++
 arch/arm/include/asm/arch-kirkwood/cpu.h |    1 +
 2 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/kirkwood/cpu.c b/arch/arm/cpu/arm926ejs/kirkwood/cpu.c
index b4a4c04..818c82f 100644
--- a/arch/arm/cpu/arm926ejs/kirkwood/cpu.c
+++ b/arch/arm/cpu/arm926ejs/kirkwood/cpu.c
@@ -270,11 +270,28 @@ static void kw_sysrst_check(void)
 }
 
 #if defined(CONFIG_DISPLAY_CPUINFO)
+#define MSAR_CPUCLCK_EXTRACT(X)	(((X & 0x2) >> 1) | ((X & 0x400000) >> 21) | \
+				((X & 0x18) >> 1))
+#define MSAR_L2CLCK_EXTRACT(X)  (((X & 0x600) >> 9) | ((X & 0x80000) >> 17))
+#define MSAR_DDRCLCK_RTIO_MASK  (0xf << 5)
+
+/*
+ * TCCLK bit:
+ *   1 = 166 MHz
+ *   0 = 200 MHz
+ */
+#define MSAR_TCLCK_MASK		0x00200000
+#define MV_BOARD_TCLK_166MHZ	166666667
+#define MV_BOARD_TCLK_200MHZ	200000000
+
 int print_cpuinfo(void)
 {
 	char *rev;
 	u16 devid = (readl(KW_REG_PCIE_DEVID) >> 16) & 0xffff;
 	u8 revid = readl(KW_REG_PCIE_REVID) & 0xff;
+	u32 cpu_clk, t_clk, tmp;
+	u32 sys_clk, l2_clk;
+	u32 l2_ratio, ddr_ratio;
 
 	if ((readl(KW_REG_DEVICE_ID) & 0x03) > 2) {
 		printf("Error.. %s:Unsupported Kirkwood SoC 88F%04x\n", __FUNCTION__, devid);
@@ -297,6 +314,30 @@ int print_cpuinfo(void)
 	}
 
 	printf("SoC:   Kirkwood 88F%04x_%s\n", devid, rev);
+
+	tmp = readl(MPP_SAMPLE_AT_RESET);
+	cpu_clk = MSAR_CPUCLCK_EXTRACT(tmp);
+	if (cpu_clk == 0x9)
+		cpu_clk = 1200;
+
+	l2_ratio = MSAR_L2CLCK_EXTRACT(tmp);
+	l2_clk = cpu_clk / l2_ratio;
+
+	ddr_ratio = tmp & MSAR_DDRCLCK_RTIO_MASK;
+	ddr_ratio = ddr_ratio >> 5;
+	if (ddr_ratio == 4)
+		sys_clk = 400;
+
+	if (tmp & MSAR_TCLCK_MASK)
+		t_clk = MV_BOARD_TCLK_166MHZ;
+	else
+		t_clk = MV_BOARD_TCLK_200MHZ;
+
+	printf("CPU running @ %dMHz L2 running @ %dMHz\n",
+		cpu_clk, l2_clk);
+	printf("SysClock = %dMHz, TClock = %dMHz\n",
+		sys_clk, t_clk / 1000000);
+
 	return 0;
 }
 #endif /* CONFIG_DISPLAY_CPUINFO */
diff --git a/arch/arm/include/asm/arch-kirkwood/cpu.h b/arch/arm/include/asm/arch-kirkwood/cpu.h
index d28c51a..28ddd25 100644
--- a/arch/arm/include/asm/arch-kirkwood/cpu.h
+++ b/arch/arm/include/asm/arch-kirkwood/cpu.h
@@ -41,6 +41,7 @@
 #define KW_REG_SYSRST_CNT		(KW_MPP_BASE + 0x50)
 #define SYSRST_CNT_1SEC_VAL		(25*1000000)
 #define KW_REG_MPP_OUT_DRV_REG		(KW_MPP_BASE + 0xE0)
+#define MPP_SAMPLE_AT_RESET		(KW_MPP_BASE + 0x30)
 
 enum memory_bank {
 	BANK0,
-- 
1.7.0.4