From 38a41fdf94c449c165213e4665c3f8a0d30f8aba Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Sat, 5 Jul 2008 10:02:46 +0200 Subject: IMX: introduce clock API This patch introduces the clock API for i.MX and converts all in-Kernel drivers to use it. Signed-off-by: Sascha Hauer --- arch/arm/mach-imx/cpufreq.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) (limited to 'arch/arm/mach-imx/cpufreq.c') diff --git a/arch/arm/mach-imx/cpufreq.c b/arch/arm/mach-imx/cpufreq.c index e548ba7..be0809b 100644 --- a/arch/arm/mach-imx/cpufreq.c +++ b/arch/arm/mach-imx/cpufreq.c @@ -32,6 +32,8 @@ #include #include #include +#include +#include #include #include @@ -52,6 +54,8 @@ static u32 mpctl0_at_boot; static u32 bclk_div_at_boot; +static struct clk *system_clk, *mcu_clk; + static void imx_set_async_mode(void) { adjust_cr(CR_920T_CLOCK_MODE, CR_920T_ASYNC_MODE); @@ -160,10 +164,10 @@ static unsigned int imx_get_speed(unsigned int cpu) cr = get_cr(); if((cr & CR_920T_CLOCK_MODE) == CR_920T_FASTBUS_MODE) { - freq = imx_get_system_clk(); + freq = clk_get_rate(system_clk); freq = (freq + bclk_div/2) / bclk_div; } else { - freq = imx_get_mcu_clk(); + freq = clk_get_rate(mcu_clk); if (cscr & CSCR_MPU_PRESC) freq /= 2; } @@ -201,7 +205,7 @@ static int imx_set_target(struct cpufreq_policy *policy, pr_debug(KERN_DEBUG "imx: requested frequency %ld Hz, mpctl0 at boot 0x%08x\n", freq, mpctl0_at_boot); - sysclk = imx_get_system_clk(); + sysclk = clk_get_rate(system_clk); if (freq > sysclk / bclk_div_at_boot + 1000000) { freq = imx_compute_mpctl(&mpctl0, mpctl0_at_boot, CLK32 * 512, freq, relation); @@ -290,6 +294,16 @@ static int __init imx_cpufreq_init(void) bclk_div_at_boot = __mfld2val(CSCR_BCLK_DIV, CSCR) + 1; mpctl0_at_boot = 0; + system_clk = clk_get(NULL, "system_clk"); + if (IS_ERR(system_clk)) + return PTR_ERR(system_clk); + + mcu_clk = clk_get(NULL, "mcu_clk"); + if (IS_ERR(mcu_clk)) { + clk_put(system_clk); + return PTR_ERR(mcu_clk); + } + if((CSCR & CSCR_MPEN) && ((get_cr() & CR_920T_CLOCK_MODE) != CR_920T_FASTBUS_MODE)) mpctl0_at_boot = MPCTL0; -- cgit v1.1