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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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76
arch/arm/mach-imx/generic.c
View File

@@ -214,82 +214,6 @@ int imx_irq_to_gpio(unsigned irq)
EXPORT_SYMBOL(imx_irq_to_gpio);
/*
* get the system pll clock in Hz
*
* mfi + mfn / (mfd +1)
* f = 2 * f_ref * --------------------
* pd + 1
*/
static unsigned int imx_decode_pll(unsigned int pll, u32 f_ref)
{
unsigned long long ll;
unsigned long quot;
u32 mfi = (pll >> 10) & 0xf;
u32 mfn = pll & 0x3ff;
u32 mfd = (pll >> 16) & 0x3ff;
u32 pd = (pll >> 26) & 0xf;
mfi = mfi <= 5 ? 5 : mfi;
ll = 2 * (unsigned long long)f_ref * ( (mfi<<16) + (mfn<<16) / (mfd+1) );
quot = (pd+1) * (1<<16);
ll += quot / 2;
do_div(ll, quot);
return (unsigned int) ll;
}
unsigned int imx_get_system_clk(void)
{
u32 f_ref = (CSCR & CSCR_SYSTEM_SEL) ? 16000000 : (CLK32 * 512);
return imx_decode_pll(SPCTL0, f_ref);
}
EXPORT_SYMBOL(imx_get_system_clk);
unsigned int imx_get_mcu_clk(void)
{
return imx_decode_pll(MPCTL0, CLK32 * 512);
}
EXPORT_SYMBOL(imx_get_mcu_clk);
/*
* get peripheral clock 1 ( UART[12], Timer[12], PWM )
*/
unsigned int imx_get_perclk1(void)
{
return imx_get_system_clk() / (((PCDR) & 0xf)+1);
}
EXPORT_SYMBOL(imx_get_perclk1);
/*
* get peripheral clock 2 ( LCD, SD, SPI[12] )
*/
unsigned int imx_get_perclk2(void)
{
return imx_get_system_clk() / (((PCDR>>4) & 0xf)+1);
}
EXPORT_SYMBOL(imx_get_perclk2);
/*
* get peripheral clock 3 ( SSI )
*/
unsigned int imx_get_perclk3(void)
{
return imx_get_system_clk() / (((PCDR>>16) & 0x7f)+1);
}
EXPORT_SYMBOL(imx_get_perclk3);
/*
* get hclk ( SDRAM, CSI, Memory Stick, I2C, DMA )
*/
unsigned int imx_get_hclk(void)
{
return imx_get_system_clk() / (((CSCR>>10) & 0xf)+1);
}
EXPORT_SYMBOL(imx_get_hclk);
static struct resource imx_mmc_resources[] = {
[0] = {
.start = 0x00214000,