ARM: ux500: cpuidle: Move ux500 cpuidle driver to drivers/cpuidle

There is no more dependency with arch/arm headers, so we can safely move the
driver to the drivers/cpuidle directory.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 131 insertions, 0 deletions

diff --git a/drivers/cpuidle/cpuidle-ux500.c b/drivers/cpuidle/cpuidle-ux500.c
new file mode 100644
index 000000000000..e0564652af35
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-ux500.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2012 Linaro : Daniel Lezcano <daniel.lezcano@linaro.org> (IBM)
+ *
+ * Based on the work of Rickard Andersson <rickard.andersson@stericsson.com>
+ * and Jonas Aaberg <jonas.aberg@stericsson.com>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/cpuidle.h>
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+#include <linux/smp.h>
+#include <linux/mfd/dbx500-prcmu.h>
+#include <linux/platform_data/arm-ux500-pm.h>
+#include <linux/platform_device.h>
+
+#include <asm/cpuidle.h>
+#include <asm/proc-fns.h>
+
+static atomic_t master = ATOMIC_INIT(0);
+static DEFINE_SPINLOCK(master_lock);
+
+static inline int ux500_enter_idle(struct cpuidle_device *dev,
+                                   struct cpuidle_driver *drv, int index)
+{
+        int this_cpu = smp_processor_id();
+        bool recouple = false;
+
+        if (atomic_inc_return(&master) == num_online_cpus()) {
+
+                /* With this lock, we prevent the other cpu to exit and enter
+                 * this function again and become the master */
+                if (!spin_trylock(&master_lock))
+                        goto wfi;
+
+                /* decouple the gic from the A9 cores */
+                if (prcmu_gic_decouple()) {
+                        spin_unlock(&master_lock);
+                        goto out;
+                }
+
+                /* If an error occur, we will have to recouple the gic
+                 * manually */
+                recouple = true;
+
+                /* At this state, as the gic is decoupled, if the other
+                 * cpu is in WFI, we have the guarantee it won't be wake
+                 * up, so we can safely go to retention */
+                if (!prcmu_is_cpu_in_wfi(this_cpu ? 0 : 1))
+                        goto out;
+
+                /* The prcmu will be in charge of watching the interrupts
+                 * and wake up the cpus */
+                if (prcmu_copy_gic_settings())
+                        goto out;
+
+                /* Check in the meantime an interrupt did
+                 * not occur on the gic ... */
+                if (prcmu_gic_pending_irq())
+                        goto out;
+
+                /* ... and the prcmu */
+                if (prcmu_pending_irq())
+                        goto out;
+
+                /* Go to the retention state, the prcmu will wait for the
+                 * cpu to go WFI and this is what happens after exiting this
+                 * 'master' critical section */
+                if (prcmu_set_power_state(PRCMU_AP_IDLE, true, true))
+                        goto out;
+
+                /* When we switch to retention, the prcmu is in charge
+                 * of recoupling the gic automatically */
+                recouple = false;
+
+                spin_unlock(&master_lock);
+        }
+wfi:
+        cpu_do_idle();
+out:
+        atomic_dec(&master);
+
+        if (recouple) {
+                prcmu_gic_recouple();
+                spin_unlock(&master_lock);
+        }
+
+        return index;
+}
+
+static struct cpuidle_driver ux500_idle_driver = {
+        .name = "ux500_idle",
+        .owner = THIS_MODULE,
+        .states = {
+                ARM_CPUIDLE_WFI_STATE,
+                {
+                        .enter            = ux500_enter_idle,
+                        .exit_latency     = 70,
+                        .target_residency = 260,
+                        .flags            = CPUIDLE_FLAG_TIME_VALID |
+                                            CPUIDLE_FLAG_TIMER_STOP,
+                        .name             = "ApIdle",
+                        .desc             = "ARM Retention",
+                },
+        },
+        .safe_state_index = 0,
+        .state_count = 2,
+};
+
+static int __init dbx500_cpuidle_probe(struct platform_device *pdev)
+{
+        /* Configure wake up reasons */
+        prcmu_enable_wakeups(PRCMU_WAKEUP(ARM) | PRCMU_WAKEUP(RTC) |
+                             PRCMU_WAKEUP(ABB));
+
+        return cpuidle_register(&ux500_idle_driver, NULL);
+}
+
+static struct platform_driver dbx500_cpuidle_plat_driver = {
+        .driver = {
+                .name = "cpuidle-dbx500",
+                .owner = THIS_MODULE,
+        },
+        .probe = dbx500_cpuidle_probe,
+};
+
+module_platform_driver(dbx500_cpuidle_plat_driver);