From 60bfe7fa3dc13fe90d273371b65ae3ec89583c52 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Tue, 4 Mar 2008 11:14:23 +0100 Subject: [ARM] 4832/2: Support AC97CLK on PXA3xx via the clock API The AC97 clock rate on PXA3xx is generated with a configurable divider from sys_pll. Signed-off-by: Mark Brown Acked-by: eric miao Signed-off-by: Russell King --- arch/arm/mach-pxa/pxa3xx.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) (limited to 'arch') diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c index 54c9e8371a2..93f3236b410 100644 --- a/arch/arm/mach-pxa/pxa3xx.c +++ b/arch/arm/mach-pxa/pxa3xx.c @@ -109,6 +109,25 @@ unsigned int pxa3xx_get_memclk_frequency_10khz(void) return (clk / 10000); } +/* + * Return the current AC97 clock frequency. + */ +static unsigned long clk_pxa3xx_ac97_getrate(struct clk *clk) +{ + unsigned long rate = 312000000; + unsigned long ac97_div; + + ac97_div = AC97_DIV; + + /* This may loose precision for some rates but won't for the + * standard 24.576MHz. + */ + rate /= (ac97_div >> 12) & 0x7fff; + rate *= (ac97_div & 0xfff); + + return rate; +} + /* * Return the current HSIO bus clock frequency */ @@ -156,6 +175,12 @@ static const struct clkops clk_pxa3xx_hsio_ops = { .getrate = clk_pxa3xx_hsio_getrate, }; +static const struct clkops clk_pxa3xx_ac97_ops = { + .enable = clk_pxa3xx_cken_enable, + .disable = clk_pxa3xx_cken_disable, + .getrate = clk_pxa3xx_ac97_getrate, +}; + static void clk_pout_enable(struct clk *clk) { OSCC |= OSCC_PEN; @@ -197,8 +222,9 @@ static struct clk pxa3xx_clks[] = { .delay = 70, }, - PXA3xx_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev), - PXA3xx_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL), + PXA3xx_CK("LCDCLK", LCD, &clk_pxa3xx_hsio_ops, &pxa_device_fb.dev), + PXA3xx_CK("CAMCLK", CAMERA, &clk_pxa3xx_hsio_ops, NULL), + PXA3xx_CK("AC97CLK", AC97, &clk_pxa3xx_ac97_ops, NULL), PXA3xx_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev), PXA3xx_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev), -- cgit v1.2.3-70-g09d2