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msm: krait-regulator: Initialize headswitches for secondary CPUs

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Create a function to be called very early (before the krait-regulator
driver probes) to switch a cpu in BHS mode. Since we have not yet
probed yet, use the base address passed in to do the necessary writes.

Change-Id: I1cb1659f1e31e52b9d209427887230ee922aef80
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
This commit is contained in:
Abhijeet Dharmapurikar 2012-08-14 20:44:58 -07:00 committed by Stephen Boyd
parent 911d294bef
commit a897151df8
2 changed files with 18 additions and 1 deletions
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18
arch/arm/mach-msm/krait-regulator.c
View file

@ -70,7 +70,7 @@
#define CORE_VOLTAGE_MIN 900000
#define KRAIT_LDO_VOLTAGE_MIN 465000
#define KRAIT_LDO_VOLTAGE_OFFSET 460000
#define KRAIT_LDO_VOLTAGE_OFFSET 465000
#define KRAIT_LDO_STEP 5000
#define BHS_SETTLING_DELAY_US 1
@ -734,6 +734,22 @@ static void __exit krait_power_exit(void)
module_exit(krait_power_exit);
void secondary_cpu_hs_init(void *base_ptr)
{
/* 605mV retention and 705mV operational voltage */
writel_relaxed(0x1C30, base_ptr + APC_LDO_VREF_SET);
writel_relaxed(0x430000, base_ptr + 0x20);
writel_relaxed(0x21, base_ptr + 0x1C);
/* Turn on the BHS, turn off LDO Bypass and power down LDO */
writel_relaxed(0x403F007F, base_ptr + APC_PWR_GATE_CTL);
mb();
udelay(1);
/* Finally turn on the bypass so that BHS supplies power */
writel_relaxed(0x403F3F7F, base_ptr + APC_PWR_GATE_CTL);
}
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("KRAIT POWER regulator driver");
MODULE_VERSION("1.0");

1
include/linux/regulator/krait-regulator.h
View file

@ -23,5 +23,6 @@
* success and error on failure.
*/
int __init krait_power_init(void);
void secondary_cpu_hs_init(void *base_ptr);
#endif