static void __init ar934x_detect_sys_frequency(void)
{
u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
+ u32 cpu_pll, ddr_pll;
+ u32 bootstrap;
- if (ar71xx_reset_rr(AR934X_RESET_REG_BOOTSTRAP) & AR934X_REF_CLK_40)
+ bootstrap = ar71xx_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
+ if (bootstrap & AR934X_BOOTSTRAP_REF_CLK_40)
ar71xx_ref_freq = 40 * 1000 * 1000;
else
ar71xx_ref_freq = 25 * 1000 * 1000;
- clk_ctrl = ar71xx_pll_rr(AR934X_PLL_REG_DDR_CTRL_CLOCK);
-
pll = ar71xx_pll_rr(AR934X_PLL_REG_CPU_CONFIG);
out_div = AR934X_CPU_PLL_CFG_OUTDIV_GET(pll);
ref_div = AR934X_CPU_PLL_CFG_REFDIV_GET(pll);
nint = AR934X_CPU_PLL_CFG_NINT_GET(pll);
frac = AR934X_CPU_PLL_CFG_NFRAC_GET(pll);
- postdiv = AR934X_CPU_DDR_CLK_CTRL_CPU_POST_DIV_GET(clk_ctrl);
- ar71xx_cpu_freq = ((nint * ar71xx_ref_freq / ref_div) >> out_div) /
- (postdiv + 1);
+ cpu_pll = nint * ar71xx_ref_freq / ref_div;
+ cpu_pll += frac * ar71xx_ref_freq / (ref_div * (2 << 6));
+ cpu_pll /= (1 << out_div);
+
+ pll = ar71xx_pll_rr(AR934X_PLL_REG_DDR_CONFIG);
out_div = AR934X_DDR_PLL_CFG_OUTDIV_GET(pll);
ref_div = AR934X_DDR_PLL_CFG_REFDIV_GET(pll);
nint = AR934X_DDR_PLL_CFG_NINT_GET(pll);
frac = AR934X_DDR_PLL_CFG_NFRAC_GET(pll);
- postdiv = AR934X_CPU_DDR_CLK_CTRL_DDR_POST_DIV_GET(clk_ctrl);
- ar71xx_ddr_freq = ((nint * ar71xx_ref_freq / ref_div) >> out_div) /
- (postdiv + 1);
- postdiv = AR934X_CPU_DDR_CLK_CTRL_AHB_POST_DIV_GET(clk_ctrl);
+ ddr_pll = nint * ar71xx_ref_freq / ref_div;
+ ddr_pll += frac * ar71xx_ref_freq / (ref_div * (2 << 10));
+ ddr_pll /= (1 << out_div);
+
+ clk_ctrl = ar71xx_pll_rr(AR934X_PLL_REG_DDR_CTRL_CLOCK);
+
+ if (clk_ctrl & AR934X_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS) {
+ ar71xx_cpu_freq = ar71xx_ref_freq;
+ } else {
+ postdiv = AR934X_CPU_DDR_CLK_CTRL_CPU_POST_DIV_GET(clk_ctrl);
+
+ if (clk_ctrl & AR934X_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL)
+ ar71xx_cpu_freq = cpu_pll / (postdiv + 1);
+ else
+ ar71xx_cpu_freq = ddr_pll / (postdiv + 1);
+ }
- if (AR934X_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL_GET(clk_ctrl)) {
- ar71xx_ahb_freq = ar71xx_ddr_freq / (postdiv + 1);
+ if (clk_ctrl & AR934X_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS) {
+ ar71xx_ddr_freq = ar71xx_ref_freq;
} else {
- ar71xx_ahb_freq = ar71xx_cpu_freq / (postdiv + 1);
+ postdiv = AR934X_CPU_DDR_CLK_CTRL_DDR_POST_DIV_GET(clk_ctrl);
+
+ if (clk_ctrl & AR934X_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL)
+ ar71xx_ddr_freq = ddr_pll / (postdiv + 1);
+ else
+ ar71xx_ddr_freq = cpu_pll / (postdiv + 1);
}
+ if (clk_ctrl & AR934X_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS) {
+ ar71xx_ahb_freq = ar71xx_ref_freq;
+ } else {
+ postdiv = AR934X_CPU_DDR_CLK_CTRL_AHB_POST_DIV_GET(clk_ctrl);
+
+ if (clk_ctrl & AR934X_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL)
+ ar71xx_ahb_freq = ddr_pll / (postdiv + 1);
+ else
+ ar71xx_ahb_freq = cpu_pll / (postdiv + 1);
+ }
}
static void __init ar91xx_detect_sys_frequency(void)