From e11b9c8371ce855d10846e764267d9ae68694f27 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Tue, 31 May 2011 22:53:29 +0000
Subject: [PATCH] ar71xx: add AR933x specific frequency initialization code

SVN-Revision: 27056
---
 .../ar71xx/files/arch/mips/ar71xx/setup.c     | 55 +++++++++++++++++++
 .../mips/include/asm/mach-ar71xx/ar71xx.h     | 21 +++++++
 2 files changed, 76 insertions(+)

diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c b/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c
index d70347041a..ba3ef3ea09 100644
--- a/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c
+++ b/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c
@@ -283,6 +283,56 @@ static void __init ar724x_detect_sys_frequency(void)
 	ar71xx_ahb_freq = ar71xx_cpu_freq / div;
 }
 
+static void __init ar933x_detect_sys_frequency(void)
+{
+	u32 clock_ctrl;
+	u32 cpu_config;
+	u32 freq;
+	u32 t;
+
+	t = ar71xx_reset_rr(AR933X_RESET_REG_BOOTSTRAP);
+	if (t & AR933X_BOOTSTRAP_REF_CLK_40)
+		ar71xx_ref_freq = (40 * 1000 * 1000);
+	else
+		ar71xx_ref_freq = (25 * 1000 * 1000);
+
+	clock_ctrl = ar71xx_pll_rr(AR933X_PLL_CLOCK_CTRL_REG);
+	if (clock_ctrl & AR933X_PLL_CLOCK_CTRL_BYPASS) {
+		ar71xx_cpu_freq = ar71xx_ref_freq;
+		ar71xx_ahb_freq = ar71xx_ref_freq;
+		ar71xx_ddr_freq = ar71xx_ref_freq;
+	} else {
+		cpu_config = ar71xx_pll_rr(AR933X_PLL_CPU_CONFIG_REG);
+
+		t = (cpu_config >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
+		    AR933X_PLL_CPU_CONFIG_REFDIV_MASK;
+		freq = ar71xx_ref_freq / t;
+
+		t = (cpu_config >> AR933X_PLL_CPU_CONFIG_NINT_SHIFT) &
+		    AR933X_PLL_CPU_CONFIG_NINT_MASK;
+		freq *= t;
+
+		t = (cpu_config >> AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
+		    AR933X_PLL_CPU_CONFIG_OUTDIV_MASK;
+		if (t == 0)
+			t = 1;
+
+		freq >>= t;
+
+		t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_CPU_DIV_SHIFT) &
+		     AR933X_PLL_CLOCK_CTRL_CPU_DIV_MASK) + 1;
+		ar71xx_cpu_freq = freq / t;
+
+		t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_DDR_DIV_SHIFT) &
+		      AR933X_PLL_CLOCK_CTRL_DDR_DIV_MASK) + 1;
+		ar71xx_ddr_freq = freq / t;
+
+		t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT) &
+		     AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK) + 1;
+		ar71xx_ahb_freq = freq / t;
+	}
+}
+
 static void __init detect_sys_frequency(void)
 {
 	switch (ar71xx_soc) {
@@ -303,6 +353,11 @@ static void __init detect_sys_frequency(void)
 		ar91xx_detect_sys_frequency();
 		break;
 
+	case AR71XX_SOC_AR9330:
+	case AR71XX_SOC_AR9331:
+		ar933x_detect_sys_frequency();
+		break;
+
 	case AR71XX_SOC_AR9341:
 	case AR71XX_SOC_AR9342:
 	case AR71XX_SOC_AR9344:
diff --git a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h
index 47ad8a4bae..759c8e6ab3 100644
--- a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h
+++ b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h
@@ -188,6 +188,24 @@ extern enum ar71xx_soc_type ar71xx_soc;
 #define AR91XX_ETH0_PLL_SHIFT		20
 #define AR91XX_ETH1_PLL_SHIFT		22
 
+#define AR933X_PLL_CPU_CONFIG_REG	0x00
+#define AR933X_PLL_CLOCK_CTRL_REG	0x08
+
+#define AR933X_PLL_CPU_CONFIG_NINT_SHIFT	10
+#define AR933X_PLL_CPU_CONFIG_NINT_MASK		0x3f
+#define AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT	16
+#define AR933X_PLL_CPU_CONFIG_REFDIV_MASK	0x1f
+#define AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT	23
+#define AR933X_PLL_CPU_CONFIG_OUTDIV_MASK	0x7
+
+#define AR933X_PLL_CLOCK_CTRL_BYPASS		BIT(2)
+#define AR933X_PLL_CLOCK_CTRL_CPU_DIV_SHIFT	5
+#define AR933X_PLL_CLOCK_CTRL_CPU_DIV_MASK	0x3
+#define AR933X_PLL_CLOCK_CTRL_DDR_DIV_SHIFT	10
+#define AR933X_PLL_CLOCK_CTRL_DDR_DIV_MASK	0x3
+#define AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT	15
+#define AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK	0x7
+
 #define AR934X_PLL_REG_CPU_CONFIG	0x00
 #define AR934X_PLL_REG_DDR_CTRL_CLOCK	0x8
 
@@ -579,6 +597,9 @@ void ar71xx_ddr_flush(u32 reg);
 
 #define AR724X_RESET_REG_RESET_MODULE		0x1c
 
+#define AR933X_RESET_REG_BOOTSTRAP		0xac
+#define AR933X_BOOTSTRAP_REF_CLK_40		BIT(0)
+
 #define AR934X_RESET_REG_RESET_MODULE		0x1c
 #define AR934X_RESET_REG_BOOTSTRAP		0xb0
 /* 0 - 25MHz   1 - 40 MHz */