1 files changed, 184 insertions, 0 deletions

diff --git a/arch/arm/mach-pnx4008/pm.c b/arch/arm/mach-pnx4008/pm.c
new file mode 100644
index 000000000000..3649cd3dfc9a
--- /dev/null
+++ b/arch/arm/mach-pnx4008/pm.c
@@ -0,0 +1,184 @@
+/*
+ * arch/arm/mach-pnx4008/pm.c
+ *
+ * Power Management driver for PNX4008
+ *
+ * Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
+ *
+ * 2005 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/pm.h>
+#include <linux/rtc.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/pm.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+
+#include <asm/io.h>
+#include <asm/mach-types.h>
+#include <asm/cacheflush.h>
+#include <asm/arch/pm.h>
+#include <asm/arch/clock.h>
+
+#define SRAM_VA IO_ADDRESS(PNX4008_IRAM_BASE)
+
+static void *saved_sram;
+
+static struct clk *pll4_clk;
+
+static inline void pnx4008_standby(void)
+{
+        void (*pnx4008_cpu_standby_ptr) (void);
+
+        local_irq_disable();
+        local_fiq_disable();
+
+        clk_disable(pll4_clk);
+
+        /*saving portion of SRAM to be used by suspend function. */
+        memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_standby_sz);
+
+        /*make sure SRAM copy gets physically written into SDRAM.
+           SDRAM will be placed into self-refresh during power down */
+        flush_cache_all();
+
+        /*copy suspend function into SRAM */
+        memcpy((void *)SRAM_VA, pnx4008_cpu_standby, pnx4008_cpu_standby_sz);
+
+        /*do suspend */
+        pnx4008_cpu_standby_ptr = (void *)SRAM_VA;
+        pnx4008_cpu_standby_ptr();
+
+        /*restoring portion of SRAM that was used by suspend function */
+        memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_standby_sz);
+
+        clk_enable(pll4_clk);
+
+        local_fiq_enable();
+        local_irq_enable();
+}
+
+static inline void pnx4008_suspend(void)
+{
+        void (*pnx4008_cpu_suspend_ptr) (void);
+
+        local_irq_disable();
+        local_fiq_disable();
+
+        clk_disable(pll4_clk);
+
+        __raw_writel(0xffffffff, START_INT_RSR_REG(SE_PIN_BASE_INT));
+        __raw_writel(0xffffffff, START_INT_RSR_REG(SE_INT_BASE_INT));
+
+        /*saving portion of SRAM to be used by suspend function. */
+        memcpy(saved_sram, (void *)SRAM_VA, pnx4008_cpu_suspend_sz);
+
+        /*make sure SRAM copy gets physically written into SDRAM.
+           SDRAM will be placed into self-refresh during power down */
+        flush_cache_all();
+
+        /*copy suspend function into SRAM */
+        memcpy((void *)SRAM_VA, pnx4008_cpu_suspend, pnx4008_cpu_suspend_sz);
+
+        /*do suspend */
+        pnx4008_cpu_suspend_ptr = (void *)SRAM_VA;
+        pnx4008_cpu_suspend_ptr();
+
+        /*restoring portion of SRAM that was used by suspend function */
+        memcpy((void *)SRAM_VA, saved_sram, pnx4008_cpu_suspend_sz);
+
+        clk_enable(pll4_clk);
+
+        local_fiq_enable();
+        local_irq_enable();
+}
+
+static int pnx4008_pm_enter(suspend_state_t state)
+{
+        switch (state) {
+        case PM_SUSPEND_STANDBY:
+                pnx4008_standby();
+                break;
+        case PM_SUSPEND_MEM:
+                pnx4008_suspend();
+                break;
+        case PM_SUSPEND_DISK:
+                return -ENOTSUPP;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+/*
+ * Called after processes are frozen, but before we shut down devices.
+ */
+static int pnx4008_pm_prepare(suspend_state_t state)
+{
+        switch (state) {
+        case PM_SUSPEND_STANDBY:
+        case PM_SUSPEND_MEM:
+                break;
+
+        case PM_SUSPEND_DISK:
+                return -ENOTSUPP;
+                break;
+
+        default:
+                return -EINVAL;
+                break;
+        }
+        return 0;
+}
+
+/*
+ * Called after devices are re-setup, but before processes are thawed.
+ */
+static int pnx4008_pm_finish(suspend_state_t state)
+{
+        return 0;
+}
+
+/*
+ * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
+ */
+static struct pm_ops pnx4008_pm_ops = {
+        .prepare = pnx4008_pm_prepare,
+        .enter = pnx4008_pm_enter,
+        .finish = pnx4008_pm_finish,
+};
+
+static int __init pnx4008_pm_init(void)
+{
+        u32 sram_size_to_allocate;
+
+        pll4_clk = clk_get(0, "ck_pll4");
+        if (IS_ERR(pll4_clk)) {
+                printk(KERN_ERR
+                       "PM Suspend cannot acquire ARM(PLL4) clock control\n");
+                return PTR_ERR(pll4_clk);
+        }
+
+        if (pnx4008_cpu_standby_sz > pnx4008_cpu_suspend_sz)
+                sram_size_to_allocate = pnx4008_cpu_standby_sz;
+        else
+                sram_size_to_allocate = pnx4008_cpu_suspend_sz;
+
+        saved_sram = kmalloc(sram_size_to_allocate, GFP_ATOMIC);
+        if (!saved_sram) {
+                printk(KERN_ERR
+                       "PM Suspend: cannot allocate memory to save portion of SRAM\n");
+                clk_put(pll4_clk);
+                return -ENOMEM;
+        }
+
+        pm_set_ops(&pnx4008_pm_ops);
+        return 0;
+}
+
+late_initcall(pnx4008_pm_init);