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IMX: introduce clock API

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This patch introduces the clock API for i.MX and converts all
in-Kernel drivers to use it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer
2008-07-05 10:02:46 +02:00
committed by Robert Schwebel
parent dbff4e9ea2
commit 38a41fdf94
9 changed files with 308 additions and 110 deletions
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20
arch/arm/mach-imx/cpufreq.c
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@@ -32,6 +32,8 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <asm/system.h>
#include <asm/hardware.h>
@@ -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;