diff options
Diffstat (limited to 'arch/mips/ath79/clock.c')
| -rw-r--r-- | arch/mips/ath79/clock.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/mips/ath79/clock.c b/arch/mips/ath79/clock.c index 680bde99a26c..54d0eb4db987 100644 --- a/arch/mips/ath79/clock.c +++ b/arch/mips/ath79/clock.c @@ -110,6 +110,59 @@ static void __init ar913x_clocks_init(void) ath79_uart_clk.rate = ath79_ahb_clk.rate; } +static void __init ar933x_clocks_init(void) +{ + u32 clock_ctrl; + u32 cpu_config; + u32 freq; + u32 t; + + t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP); + if (t & AR933X_BOOTSTRAP_REF_CLK_40) + ath79_ref_clk.rate = (40 * 1000 * 1000); + else + ath79_ref_clk.rate = (25 * 1000 * 1000); + + clock_ctrl = ath79_pll_rr(AR933X_PLL_CLOCK_CTRL_REG); + if (clock_ctrl & AR933X_PLL_CLOCK_CTRL_BYPASS) { + ath79_cpu_clk.rate = ath79_ref_clk.rate; + ath79_ahb_clk.rate = ath79_ref_clk.rate; + ath79_ddr_clk.rate = ath79_ref_clk.rate; + } else { + cpu_config = ath79_pll_rr(AR933X_PLL_CPU_CONFIG_REG); + + t = (cpu_config >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT) & + AR933X_PLL_CPU_CONFIG_REFDIV_MASK; + freq = ath79_ref_clk.rate / 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; + ath79_cpu_clk.rate = freq / t; + + t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_DDR_DIV_SHIFT) & + AR933X_PLL_CLOCK_CTRL_DDR_DIV_MASK) + 1; + ath79_ddr_clk.rate = freq / t; + + t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT) & + AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK) + 1; + ath79_ahb_clk.rate = freq / t; + } + + ath79_wdt_clk.rate = ath79_ref_clk.rate; + ath79_uart_clk.rate = ath79_ref_clk.rate; +} + void __init ath79_clocks_init(void) { if (soc_is_ar71xx()) @@ -118,6 +171,8 @@ void __init ath79_clocks_init(void) ar724x_clocks_init(); else if (soc_is_ar913x()) ar913x_clocks_init(); + else if (soc_is_ar933x()) + ar933x_clocks_init(); else BUG(); |