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clock-imx35: Calculate the base clock rate for the IPU unit 

The mx3fb driver needs the clock the IPU runs in order to calculate
the divider for the LCD clock. This patch adds the clock rate calculation
routine for the i.MX35 CPU.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Juergen Beisert 2010-08-16 15:54:07 +02:00 committed by Sascha Hauer
parent c56702de10
commit c735c40587
1 changed files with 28 additions and 1 deletions
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29
arch/arm/mach-mx3/clock-imx35.c
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@ -296,6 +296,33 @@ static unsigned long get_rate_ipg_per(struct clk *clk)
}
}
static unsigned long get_rate_hsp(struct clk *clk)
{
unsigned long hsp_podf = (__raw_readl(CCM_BASE + CCM_PDR0) >> 20) & 0x03;
unsigned long fref = get_rate_mpll();
if (fref > 400 * 1000 * 1000) {
switch (hsp_podf) {
case 0:
return fref >> 2;
case 1:
return fref >> 3;
case 2:
return fref / 3;
}
} else {
switch (hsp_podf) {
case 0:
case 2:
return fref / 3;
case 1:
return fref / 6;
}
}
return 0;
}
static int clk_cgr_enable(struct clk *clk)
{
u32 reg;
@ -353,7 +380,7 @@ DEFINE_CLOCK(i2c1_clk, 0, CCM_CGR1, 10, get_rate_ipg_per, NULL);
DEFINE_CLOCK(i2c2_clk, 1, CCM_CGR1, 12, get_rate_ipg_per, NULL);
DEFINE_CLOCK(i2c3_clk, 2, CCM_CGR1, 14, get_rate_ipg_per, NULL);
DEFINE_CLOCK(iomuxc_clk, 0, CCM_CGR1, 16, NULL, NULL);
DEFINE_CLOCK(ipu_clk, 0, CCM_CGR1, 18, get_rate_ahb, NULL);
DEFINE_CLOCK(ipu_clk, 0, CCM_CGR1, 18, get_rate_hsp, NULL);
DEFINE_CLOCK(kpp_clk, 0, CCM_CGR1, 20, get_rate_ipg, NULL);
DEFINE_CLOCK(mlb_clk, 0, CCM_CGR1, 22, get_rate_ahb, NULL);
DEFINE_CLOCK(mshc_clk, 0, CCM_CGR1, 24, get_rate_mshc, NULL);