#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/clockchips.h>
+#include <linux/clk/tegra.h>
#include <asm/cpuidle.h>
#include <asm/proc-fns.h>
#include "pm.h"
#include "sleep.h"
+#include "iomap.h"
+#include "irq.h"
+#include "flowctrl.h"
#ifdef CONFIG_PM_SLEEP
-static int tegra20_idle_lp2(struct cpuidle_device *dev,
- struct cpuidle_driver *drv,
- int index);
+static bool abort_flag;
+static atomic_t abort_barrier;
+static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index);
#endif
static struct cpuidle_state tegra_idle_states[] = {
[0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
#ifdef CONFIG_PM_SLEEP
[1] = {
- .enter = tegra20_idle_lp2,
+ .enter = tegra20_idle_lp2_coupled,
.exit_latency = 5000,
.target_residency = 10000,
.power_usage = 0,
- .flags = CPUIDLE_FLAG_TIME_VALID,
+ .flags = CPUIDLE_FLAG_TIME_VALID |
+ CPUIDLE_FLAG_COUPLED,
.name = "powered-down",
.desc = "CPU power gated",
},
static DEFINE_PER_CPU(struct cpuidle_device, tegra_idle_device);
#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_SMP
+static void __iomem *pmc = IO_ADDRESS(TEGRA_PMC_BASE);
+
+static int tegra20_reset_sleeping_cpu_1(void)
+{
+ int ret = 0;
+
+ tegra_pen_lock();
+
+ if (readl(pmc + PMC_SCRATCH41) == CPU_RESETTABLE)
+ tegra20_cpu_shutdown(1);
+ else
+ ret = -EINVAL;
+
+ tegra_pen_unlock();
+
+ return ret;
+}
+
+static void tegra20_wake_cpu1_from_reset(void)
+{
+ tegra_pen_lock();
+
+ tegra20_cpu_clear_resettable();
+
+ /* enable cpu clock on cpu */
+ tegra_enable_cpu_clock(1);
+
+ /* take the CPU out of reset */
+ tegra_cpu_out_of_reset(1);
+
+ /* unhalt the cpu */
+ flowctrl_write_cpu_halt(1, 0);
+
+ tegra_pen_unlock();
+}
+
+static int tegra20_reset_cpu_1(void)
+{
+ if (!cpu_online(1) || !tegra20_reset_sleeping_cpu_1())
+ return 0;
+
+ tegra20_wake_cpu1_from_reset();
+ return -EBUSY;
+}
+#else
+static inline void tegra20_wake_cpu1_from_reset(void)
+{
+}
+
+static inline int tegra20_reset_cpu_1(void)
+{
+ return 0;
+}
+#endif
+
+static bool tegra20_cpu_cluster_power_down(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
+{
+ struct cpuidle_state *state = &drv->states[index];
+ u32 cpu_on_time = state->exit_latency;
+ u32 cpu_off_time = state->target_residency - state->exit_latency;
+
+ while (tegra20_cpu_is_resettable_soon())
+ cpu_relax();
+
+ if (tegra20_reset_cpu_1() || !tegra_cpu_rail_off_ready())
+ return false;
+
+ clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu);
+
+ tegra_idle_lp2_last(cpu_on_time, cpu_off_time);
+
+ clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);
+
+ if (cpu_online(1))
+ tegra20_wake_cpu1_from_reset();
+
+ return true;
+}
+
#ifdef CONFIG_SMP
static bool tegra20_idle_enter_lp2_cpu_1(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
}
#endif
-static int tegra20_idle_lp2(struct cpuidle_device *dev,
- struct cpuidle_driver *drv,
- int index)
+static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
{
u32 cpu = is_smp() ? cpu_logical_map(dev->cpu) : dev->cpu;
bool entered_lp2 = false;
+ if (tegra_pending_sgi())
+ ACCESS_ONCE(abort_flag) = true;
+
+ cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
+
+ if (abort_flag) {
+ cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
+ abort_flag = false; /* clean flag for next coming */
+ return -EINTR;
+ }
+
local_fiq_disable();
tegra_set_cpu_in_lp2(cpu);
cpu_pm_enter();
if (cpu == 0)
- cpu_do_idle();
+ entered_lp2 = tegra20_cpu_cluster_power_down(dev, drv, index);
else
entered_lp2 = tegra20_idle_enter_lp2_cpu_1(dev, drv, index);
struct cpuidle_device *dev;
struct cpuidle_driver *drv = &tegra_idle_driver;
+#ifdef CONFIG_PM_SLEEP
+ tegra_tear_down_cpu = tegra20_tear_down_cpu;
+#endif
+
drv->state_count = ARRAY_SIZE(tegra_idle_states);
memcpy(drv->states, tegra_idle_states,
drv->state_count * sizeof(drv->states[0]));
for_each_possible_cpu(cpu) {
dev = &per_cpu(tegra_idle_device, cpu);
dev->cpu = cpu;
+#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
+ dev->coupled_cpus = *cpu_possible_mask;
+#endif
dev->state_count = drv->state_count;
ret = cpuidle_register_device(dev);
ENTRY(tegra20_cpu_shutdown)
cmp r0, #0
moveq pc, lr @ must not be called for CPU 0
+ mov32 r1, TEGRA_PMC_VIRT + PMC_SCRATCH41
+ mov r12, #CPU_RESETTABLE
+ str r12, [r1]
cpu_to_halt_reg r1, r0
ldr r3, =TEGRA_FLOW_CTRL_VIRT
mov pc, lr
ENDPROC(tegra20_cpu_set_resettable_soon)
+/*
+ * tegra20_cpu_is_resettable_soon(void)
+ *
+ * Returns true if the "resettable soon" flag in PMC_SCRATCH41 has been
+ * set because it is expected that the secondary CPU will be idle soon.
+ */
+ENTRY(tegra20_cpu_is_resettable_soon)
+ mov32 r1, TEGRA_PMC_VIRT + PMC_SCRATCH41
+ ldr r12, [r1]
+ cmp r12, #CPU_RESETTABLE_SOON
+ moveq r0, #1
+ movne r0, #0
+ mov pc, lr
+ENDPROC(tegra20_cpu_is_resettable_soon)
+
/*
* tegra20_sleep_cpu_secondary_finish(unsigned long v2p)
*
ldmfd sp!, {r4 - r11, pc}
ENDPROC(tegra20_sleep_cpu_secondary_finish)
+
+/*
+ * tegra20_tear_down_cpu
+ *
+ * Switches the CPU cluster to PLL-P and enters sleep.
+ */
+ENTRY(tegra20_tear_down_cpu)
+ bl tegra_switch_cpu_to_pllp
+ b tegra20_enter_sleep
+ENDPROC(tegra20_tear_down_cpu)
+
+/*
+ * tegra20_enter_sleep
+ *
+ * uses flow controller to enter sleep state
+ * executes from IRAM with SDRAM in selfrefresh when target state is LP0 or LP1
+ * executes from SDRAM with target state is LP2
+ */
+tegra20_enter_sleep:
+ mov32 r6, TEGRA_FLOW_CTRL_BASE
+
+ mov r0, #FLOW_CTRL_WAIT_FOR_INTERRUPT
+ orr r0, r0, #FLOW_CTRL_HALT_CPU_IRQ | FLOW_CTRL_HALT_CPU_FIQ
+ cpu_id r1
+ cpu_to_halt_reg r1, r1
+ str r0, [r6, r1]
+ dsb
+ ldr r0, [r6, r1] /* memory barrier */
+
+halted:
+ dsb
+ wfe /* CPU should be power gated here */
+ isb
+ b halted
+
#endif
#include "flowctrl.h"
#include "sleep.h"
+#define CLK_RESET_CCLK_BURST 0x20
+#define CLK_RESET_CCLK_DIVIDER 0x24
+
#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
/*
* tegra_disable_clean_inv_dcache
mov pc, r0
ENDPROC(tegra_shut_off_mmu)
.popsection
+
+/*
+ * tegra_switch_cpu_to_pllp
+ *
+ * In LP2 the normal cpu clock pllx will be turned off. Switch the CPU to pllp
+ */
+ENTRY(tegra_switch_cpu_to_pllp)
+ /* in LP2 idle (SDRAM active), set the CPU burst policy to PLLP */
+ mov32 r5, TEGRA_CLK_RESET_BASE
+ mov r0, #(2 << 28) @ burst policy = run mode
+ orr r0, r0, #(4 << 4) @ use PLLP in run mode burst
+ str r0, [r5, #CLK_RESET_CCLK_BURST]
+ mov r0, #0
+ str r0, [r5, #CLK_RESET_CCLK_DIVIDER]
+ mov pc, lr
+ENDPROC(tegra_switch_cpu_to_pllp)
#endif
projects / deliverable / linux.git / commitdiff
