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authorAlban Bedel <albeu@free.fr>2016-03-17 04:34:10 +0100
committerRalf Baechle <ralf@linux-mips.org>2016-04-03 12:32:10 +0200
commitf4c87b7a944adcc34f67a925d50889088fd87992 (patch)
tree657a4ea42ae790d3a2ec9b624ceb7dc1ce902bcf /arch
parentMIPS: ath79: Fix the ar724x clock calculation (diff)
downloadlinux-f4c87b7a944adcc34f67a925d50889088fd87992.tar.xz
linux-f4c87b7a944adcc34f67a925d50889088fd87992.zip
MIPS: ath79: Fix the ar913x reference clock rate
The reference clock on ar913x is at 40MHz and not 5MHz. The current implementation use the wrong reference rate because it doesn't take the PLL divider in account. But if we fix the code to use the divider it becomes identical with the implementation for ar724x, so just drop the broken ar913x implementation. Signed-off-by: Alban Bedel <albeu@free.fr> Tested-by: Antony Pavlov <antonynpavlov@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/12871/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/ath79/clock.c38
1 files changed, 1 insertions, 37 deletions
diff --git a/arch/mips/ath79/clock.c b/arch/mips/ath79/clock.c
index ed2846578405..618dfd735eed 100644
--- a/arch/mips/ath79/clock.c
+++ b/arch/mips/ath79/clock.c
@@ -27,7 +27,6 @@
#define AR71XX_BASE_FREQ 40000000
#define AR724X_BASE_FREQ 40000000
-#define AR913X_BASE_FREQ 5000000
static struct clk *clks[3];
static struct clk_onecell_data clk_data = {
@@ -123,39 +122,6 @@ static void __init ar724x_clocks_init(void)
clk_add_alias("uart", NULL, "ahb", NULL);
}
-static void __init ar913x_clocks_init(void)
-{
- unsigned long ref_rate;
- unsigned long cpu_rate;
- unsigned long ddr_rate;
- unsigned long ahb_rate;
- u32 pll;
- u32 freq;
- u32 div;
-
- ref_rate = AR913X_BASE_FREQ;
- pll = ath79_pll_rr(AR913X_PLL_REG_CPU_CONFIG);
-
- div = ((pll >> AR913X_PLL_FB_SHIFT) & AR913X_PLL_FB_MASK);
- freq = div * ref_rate;
-
- cpu_rate = freq;
-
- div = ((pll >> AR913X_DDR_DIV_SHIFT) & AR913X_DDR_DIV_MASK) + 1;
- ddr_rate = freq / div;
-
- div = (((pll >> AR913X_AHB_DIV_SHIFT) & AR913X_AHB_DIV_MASK) + 1) * 2;
- ahb_rate = cpu_rate / div;
-
- ath79_add_sys_clkdev("ref", ref_rate);
- clks[0] = ath79_add_sys_clkdev("cpu", cpu_rate);
- clks[1] = ath79_add_sys_clkdev("ddr", ddr_rate);
- clks[2] = ath79_add_sys_clkdev("ahb", ahb_rate);
-
- clk_add_alias("wdt", NULL, "ahb", NULL);
- clk_add_alias("uart", NULL, "ahb", NULL);
-}
-
static void __init ar933x_clocks_init(void)
{
unsigned long ref_rate;
@@ -443,10 +409,8 @@ void __init ath79_clocks_init(void)
{
if (soc_is_ar71xx())
ar71xx_clocks_init();
- else if (soc_is_ar724x())
+ else if (soc_is_ar724x() || soc_is_ar913x())
ar724x_clocks_init();
- else if (soc_is_ar913x())
- ar913x_clocks_init();
else if (soc_is_ar933x())
ar933x_clocks_init();
else if (soc_is_ar934x())