[PATCH 2/4] ARM: tegra: pmc: add power on function for secondary CPUs

[josephl@nvidia.com (Joseph Lo)]

On Fri, 2013-02-22 at 21:00 +0800, Peter De Schrijver wrote:
> On Fri, Feb 22, 2013 at 07:44:49AM +0100, Joseph Lo wrote:
> > Adding the power on function for secondary CPUs in PMC driver, this can
> > help us to remove legacy powergate driver and add generic power domain
> > support later.
> > 
> > Signed-off-by: Joseph Lo <josephl@nvidia.com>
> > ---
> >  arch/arm/mach-tegra/pmc.c | 105 +++++++++++++++++++++++++++++++++++++++++++++-
> >  arch/arm/mach-tegra/pmc.h |   4 ++
> >  2 files changed, 107 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
> > index 2315e25..a2446c2 100644
> > --- a/arch/arm/mach-tegra/pmc.c
> > +++ b/arch/arm/mach-tegra/pmc.c
> > @@ -21,8 +21,26 @@
> >  #include <linux/of.h>
> >  #include <linux/of_address.h>
> >  
> > -#define PMC_CTRL		0x0
> > -#define PMC_CTRL_INTR_LOW	(1 << 17)
> > +#define PMC_CTRL			0x0
> > +#define PMC_CTRL_INTR_LOW		(1 << 17)
> > +#define PMC_PWRGATE_TOGGLE		0x30
> > +#define PMC_PWRGATE_TOGGLE_START	(1 << 8)
> > +#define PMC_REMOVE_CLAMPING		0x34
> > +#define PMC_PWRGATE_STATUS		0x38
> > +
> > +#define TEGRA_POWERGATE_PCIE	3
> > +#define TEGRA_POWERGATE_VDEC	4
> > +#define TEGRA_POWERGATE_CPU1	9
> > +#define TEGRA_POWERGATE_CPU2	10
> > +#define TEGRA_POWERGATE_CPU3	11
> > +
> > +static u8 tegra_cpu_domains[] = {
> > +	0xFF,			/* not available for CPU0 */
> 
> On Tegra114 we can also powergate CPU0, so this needs to be defined then.
> 
No, DON'T DO THAT!!
We don't allow any code to power gate CPU0 manually here or elsewhere.

The function here only for SMP and hotplug bring up for secondary CPU.

Thanks,
Joseph