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ARM: OMAP: Add support for forcing osc_ck on

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Some boards might use the oscillator clock for powering
external peripherals. Add support for making sure osc_ck
stays active even when trying to go to sleep.

Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Juha Yrjola 2006-09-25 12:41:43 +03:00 • committed by Tony Lindgren
parent 12583a70ac
commit ab0a2b9b9f
2 changed files with 19 additions and 1 deletions
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18
arch/arm/mach-omap2/clock.c
View file

@ -81,6 +81,14 @@ static void omap2_propagate_rate(struct clk * clk)
propagate_rate(clk);
}
static void omap2_set_osc_ck(int enable)
{
if (enable)
PRCM_CLKSRC_CTRL &= ~(0x3 << 3);
else
PRCM_CLKSRC_CTRL |= 0x3 << 3;
}
/* Enable an APLL if off */
static void omap2_clk_fixed_enable(struct clk *clk)
{
@ -121,6 +129,11 @@ static int _omap2_clk_enable(struct clk * clk)
if (clk->flags & ALWAYS_ENABLED)
return 0;
if (unlikely(clk == &osc_ck)) {
omap2_set_osc_ck(1);
return 0;
}
if (unlikely(clk->enable_reg == 0)) {
printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
clk->name);
@ -158,6 +171,11 @@ static void _omap2_clk_disable(struct clk *clk)
{
u32 regval32;
if (unlikely(clk == &osc_ck)) {
omap2_set_osc_ck(0);
return;
}
if (clk->enable_reg == 0)
return;

2
arch/arm/mach-omap2/clock.h
View file

@ -560,7 +560,7 @@ static struct clk osc_ck = { /* (*12, *13, 19.2, *26, 38.4)MHz */
.name = "osc_ck",
.rate = 26000000, /* fixed up in clock init */
.flags = CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X |
RATE_FIXED | ALWAYS_ENABLED | RATE_PROPAGATES,
RATE_FIXED | RATE_PROPAGATES,
};
/* With out modem likely 12MHz, with modem likely 13MHz */