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ARM: tegra: support for Tegra30 CPU powerdomains

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Secondary CPU powerdomains can be powergated on Tegra30. Add the necessary
functions to do this. This will be used to boot the secondary CPUs later on.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Peter De Schrijver 2012-02-10 01:47:49 +02:00 committed by Olof Johansson
parent 6cafa97d3c
commit 65fe31da5c
3 changed files with 24 additions and 1 deletions
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3
arch/arm/mach-tegra/common.c
View file

@ -28,6 +28,7 @@
#include <mach/iomap.h>
#include <mach/system.h>
#include <mach/powergate.h>
#include "board.h"
#include "clock.h"
@ -119,6 +120,7 @@ void __init tegra20_init_early(void)
tegra_clk_init_from_table(tegra20_clk_init_table);
tegra_init_cache(0x331, 0x441);
tegra_pmc_init();
tegra_powergate_init();
}
#endif
#ifdef CONFIG_ARCH_TEGRA_3x_SOC
@ -128,5 +130,6 @@ void __init tegra30_init_early(void)
tegra30_init_clocks();
tegra_init_cache(0x441, 0x551);
tegra_pmc_init();
tegra_powergate_init();
}
#endif

3
arch/arm/mach-tegra/include/mach/powergate.h
View file

@ -38,6 +38,9 @@
#define TEGRA_POWERGATE_CPU0 TEGRA_POWERGATE_CPU
#define TEGRA_POWERGATE_3D0 TEGRA_POWERGATE_3D
int __init tegra_powergate_init(void);
int tegra_cpu_powergate_id(int cpuid);
int tegra_powergate_is_powered(int id);
int tegra_powergate_power_on(int id);
int tegra_powergate_power_off(int id);

19
arch/arm/mach-tegra/powergate.c
View file

@ -41,6 +41,14 @@
#define PWRGATE_STATUS 0x38
static int tegra_num_powerdomains;
static int tegra_num_cpu_domains;
static u8 *tegra_cpu_domains;
static u8 tegra30_cpu_domains[] = {
TEGRA_POWERGATE_CPU0,
TEGRA_POWERGATE_CPU1,
TEGRA_POWERGATE_CPU2,
TEGRA_POWERGATE_CPU3,
};
static DEFINE_SPINLOCK(tegra_powergate_lock);
@ -161,6 +169,14 @@ err_power:
return ret;
}
int tegra_cpu_powergate_id(int cpuid)
{
if (cpuid > 0 && cpuid < tegra_num_cpu_domains)
return tegra_cpu_domains[cpuid];
return -EINVAL;
}
int __init tegra_powergate_init(void)
{
switch (tegra_chip_id) {
@ -169,6 +185,8 @@ int __init tegra_powergate_init(void)
break;
case TEGRA30:
tegra_num_powerdomains = 14;
tegra_num_cpu_domains = 4;
tegra_cpu_domains = tegra30_cpu_domains;
break;
default:
/* Unknown Tegra variant. Disable powergating */
@ -178,7 +196,6 @@ int __init tegra_powergate_init(void)
return 0;
}
arch_initcall(tegra_powergate_init);
#ifdef CONFIG_DEBUG_FS