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MIPS: ath79: Fix the ar913x reference clock rate

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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>
This commit is contained in:
Alban Bedel 2016-03-17 06:34:10 +03:00 committed by Ralf Baechle
parent c338d59d12
commit f4c87b7a94
1 changed files with 1 additions and 37 deletions
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38
arch/mips/ath79/clock.c
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@ -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())