mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

ARM: tegra114: add power up sequence for warm boot CPU 

For Tegra114, once the CPUs were powered up by PMC in cold boot flow. The
flow controller will maintain the power state and control power sequence
for each CPU by setting event trigger (e.g. CPU hotplug ,idle and
suspend power down/up).

Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Joseph Lo 2013-05-20 18:39:27 +08:00 committed by Stephen Warren
parent ecc4d9da21
commit 18901e9f4f
2 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/mach-tegra/flowctrl.h
View File

@ -25,6 +25,7 @@
#define FLOW_CTRL_WAITEVENT (2 << 29)
#define FLOW_CTRL_WAIT_FOR_INTERRUPT (4 << 29)
#define FLOW_CTRL_JTAG_RESUME (1 << 28)
#define FLOW_CTRL_SCLK_RESUME (1 << 27)
#define FLOW_CTRL_HALT_CPU_IRQ (1 << 10)
#define FLOW_CTRL_HALT_CPU_FIQ (1 << 8)
#define FLOW_CTRL_CPU0_CSR 0x8

25
arch/arm/mach-tegra/platsmp.c
View File

@ -140,8 +140,31 @@ remove_clamps:
static int tegra114_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
int ret = 0;
cpu = cpu_logical_map(cpu);
return tegra_pmc_cpu_power_on(cpu);
if (cpumask_test_cpu(cpu, &tegra_cpu_init_mask)) {
/*
* Warm boot flow
* The flow controller in charge of the power state and
* control for each CPU.
*/
/* set SCLK as event trigger for flow controller */
flowctrl_write_cpu_csr(cpu, 1);
flowctrl_write_cpu_halt(cpu,
FLOW_CTRL_WAITEVENT | FLOW_CTRL_SCLK_RESUME);
} else {
/*
* Cold boot flow
* The CPU is powered up by toggling PMC directly. It will
* also initial power state in flow controller. After that,
* the CPU's power state is maintained by flow controller.
*/
ret = tegra_pmc_cpu_power_on(cpu);
}
return ret;
}
static int __cpuinit tegra_boot_secondary(unsigned int cpu,