From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/mach-pnx4008/pm.c | 155 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 arch/arm/mach-pnx4008/pm.c

(limited to 'arch/arm/mach-pnx4008/pm.c')

diff --git a/arch/arm/mach-pnx4008/pm.c b/arch/arm/mach-pnx4008/pm.c
new file mode 100644
index 00000000..f3e60a04
--- /dev/null
+++ b/arch/arm/mach-pnx4008/pm.c
@@ -0,0 +1,155 @@
+/*
+ * 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/suspend.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include <asm/cacheflush.h>
+
+#include <mach/hardware.h>
+#include <mach/pm.h>
+#include <mach/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;
+	}
+	return 0;
+}
+
+static int pnx4008_pm_valid(suspend_state_t state)
+{
+	return (state == PM_SUSPEND_STANDBY) ||
+	       (state == PM_SUSPEND_MEM);
+}
+
+static const struct platform_suspend_ops pnx4008_pm_ops = {
+	.enter = pnx4008_pm_enter,
+	.valid = pnx4008_pm_valid,
+};
+
+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;
+	}
+
+	suspend_set_ops(&pnx4008_pm_ops);
+	return 0;
+}
+
+late_initcall(pnx4008_pm_init);
-- 
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