add AR7240 specific frequency detection

SVN-Revision: 16645

target/linux/ar71xx/files/arch/mips/ar71xx/setup.c

@@ -33,6 +33,7 @@
 #define AR71XX_SYS_TYPE_LEN	64
 #define AR71XX_BASE_FREQ	40000000
 #define AR91XX_BASE_FREQ	5000000
+#define AR724X_BASE_FREQ	5000000
 
 enum ar71xx_mach_type ar71xx_mach;
 
@@ -206,6 +207,29 @@ static void __init ar71xx_detect_sys_frequency(void)
 	ar71xx_ahb_freq = ar71xx_cpu_freq / div;
 }
 
+static void __init ar724x_detect_sys_frequency(void)
+{
+	u32 pll;
+	u32 freq;
+	u32 div;
+
+	pll = ar71xx_pll_rr(AR724X_PLL_REG_CPU_CONFIG);
+
+	div = ((pll >> AR724X_PLL_DIV_SHIFT) & AR724X_PLL_DIV_MASK);
+	freq = div * AR724X_BASE_FREQ;
+
+	div = ((pll >> AR724X_PLL_REF_DIV_SHIFT) & AR724X_PLL_REF_DIV_MASK);
+	freq *= div;
+
+	ar71xx_cpu_freq = freq;
+
+	div = ((pll >> AR724X_DDR_DIV_SHIFT) & AR724X_DDR_DIV_MASK) + 1;
+	ar71xx_ddr_freq = freq / div;
+
+	div = (((pll >> AR724X_AHB_DIV_SHIFT) & AR724X_AHB_DIV_MASK) + 1) * 2;
+	ar71xx_ahb_freq = ar71xx_cpu_freq / div;
+}
+
 static void __init detect_sys_frequency(void)
 {
 	switch (ar71xx_soc) {
@@ -215,6 +239,10 @@ static void __init detect_sys_frequency(void)
 		ar71xx_detect_sys_frequency();
 		break;
 
+	case AR71XX_SOC_AR7240:
+		ar724x_detect_sys_frequency();
+		break;
+
 	case AR71XX_SOC_AR9130:
 	case AR71XX_SOC_AR9132:
 		ar91xx_detect_sys_frequency();

target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h

@@ -157,6 +157,17 @@ extern enum ar71xx_mach_type ar71xx_mach;
 #define AR71XX_ETH0_PLL_SHIFT		17
 #define AR71XX_ETH1_PLL_SHIFT		19
 
+#define AR724X_PLL_REG_CPU_CONFIG	0x00
+
+#define AR724X_PLL_DIV_SHIFT		0
+#define AR724X_PLL_DIV_MASK		0x3ff
+#define AR724X_PLL_REF_DIV_SHIFT	10
+#define AR724X_PLL_REF_DIV_MASK		0xf
+#define AR724X_AHB_DIV_SHIFT		19
+#define AR724X_AHB_DIV_MASK		0x1
+#define AR724X_DDR_DIV_SHIFT		22
+#define AR724X_DDR_DIV_MASK		0x3
+
 #define AR91XX_PLL_REG_CPU_CONFIG	0x00
 #define AR91XX_PLL_REG_ETH_CONFIG	0x04
 #define AR91XX_PLL_REG_ETH0_INT_CLOCK	0x14