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 0000000..3649cd3
--- /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);