ar71xx: add AR933x specific frequency initialization code

[openwrt/svn-archive/archive.git] / target / linux / ar71xx / files / arch / mips / ar71xx / setup.c

diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c b/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c
index d70347041ac5853c2b5814c5f8aae11ba215e1a2..ba3ef3ea09404015292caefb9e85fc7b01dcf85d 100644 (file)
--- 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: