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authorGabor Juhos <juhosg@openwrt.org>2011-11-12 10:54:08 +0000
committerGabor Juhos <juhosg@openwrt.org>2011-11-12 10:54:08 +0000
commit43e993e5f535ad0c9edf327f64f1e808e02971e2 (patch)
treef0e67b4aeb925588b502b6b2ad87c37216bd8fe9 /target/linux
parent0939419e24fe8834b6237601573dee6a28b72b8a (diff)
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ar71xx: fix AR934X clock frequency calculation
SVN-Revision: 28973
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/ar71xx/files/arch/mips/ar71xx/setup.c52
-rw-r--r--target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h8
2 files changed, 48 insertions, 12 deletions
diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c b/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c
index e12fdbf54c..f7601059ec 100644
--- a/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c
+++ b/target/linux/ar71xx/files/arch/mips/ar71xx/setup.c
@@ -183,39 +183,67 @@ static void __init ar71xx_detect_sys_type(void)
static void __init ar934x_detect_sys_frequency(void)
{
u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
+ u32 cpu_pll, ddr_pll;
if (ar71xx_reset_rr(AR934X_RESET_REG_BOOTSTRAP) & AR934X_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)
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 97ac835dc0..87a352cc43 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
@@ -212,6 +212,7 @@ extern enum ar71xx_soc_type ar71xx_soc;
#define AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK 0x7
#define AR934X_PLL_REG_CPU_CONFIG 0x00
+#define AR934X_PLL_REG_DDR_CONFIG 0x04
#define AR934X_PLL_REG_DDR_CTRL_CLOCK 0x8
#define AR934X_CPU_PLL_CFG_OUTDIV_MSB 21
@@ -372,6 +373,13 @@ extern enum ar71xx_soc_type ar71xx_soc;
#define AR934X_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL_RESET 1
+#define AR934X_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS BIT(2)
+#define AR934X_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS BIT(3)
+#define AR934X_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS BIT(4)
+#define AR934X_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL BIT(20)
+#define AR934X_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL BIT(21)
+#define AR934X_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL BIT(24)
+
extern void __iomem *ar71xx_pll_base;
static inline void ar71xx_pll_wr(unsigned reg, u32 val)