From de7bfff1b251395be9a229ee14191105d8d1385d Mon Sep 17 00:00:00 2001
From: Heiko Stuebner <heiko@sntech.de>
Date: Sat, 12 May 2012 16:22:18 +0900
Subject: ARM: S3C24XX: move common power-management code to mach-s3c24xx

This is the basic power-management code used by all s3c24xx machines.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/mach-s3c24xx/pm.c | 149 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 arch/arm/mach-s3c24xx/pm.c

(limited to 'arch/arm/mach-s3c24xx/pm.c')

diff --git a/arch/arm/mach-s3c24xx/pm.c b/arch/arm/mach-s3c24xx/pm.c
new file mode 100644
index 000000000000..60627e63a254
--- /dev/null
+++ b/arch/arm/mach-s3c24xx/pm.c
@@ -0,0 +1,149 @@
+/* linux/arch/arm/plat-s3c24xx/pm.c
+ *
+ * Copyright (c) 2004-2006 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C24XX Power Manager (Suspend-To-RAM) support
+ *
+ * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Parts based on arch/arm/mach-pxa/pm.c
+ *
+ * Thanks to Dimitry Andric for debugging
+*/
+
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/serial_core.h>
+#include <linux/io.h>
+
+#include <plat/regs-serial.h>
+#include <mach/regs-clock.h>
+#include <mach/regs-gpio.h>
+#include <mach/regs-mem.h>
+#include <mach/regs-irq.h>
+
+#include <asm/mach/time.h>
+
+#include <plat/gpio-cfg.h>
+#include <plat/pm.h>
+
+#define PFX "s3c24xx-pm: "
+
+static struct sleep_save core_save[] = {
+	SAVE_ITEM(S3C2410_LOCKTIME),
+	SAVE_ITEM(S3C2410_CLKCON),
+
+	/* we restore the timings here, with the proviso that the board
+	 * brings the system up in an slower, or equal frequency setting
+	 * to the original system.
+	 *
+	 * if we cannot guarantee this, then things are going to go very
+	 * wrong here, as we modify the refresh and both pll settings.
+	 */
+
+	SAVE_ITEM(S3C2410_BWSCON),
+	SAVE_ITEM(S3C2410_BANKCON0),
+	SAVE_ITEM(S3C2410_BANKCON1),
+	SAVE_ITEM(S3C2410_BANKCON2),
+	SAVE_ITEM(S3C2410_BANKCON3),
+	SAVE_ITEM(S3C2410_BANKCON4),
+	SAVE_ITEM(S3C2410_BANKCON5),
+
+#ifndef CONFIG_CPU_FREQ
+	SAVE_ITEM(S3C2410_CLKDIVN),
+	SAVE_ITEM(S3C2410_MPLLCON),
+	SAVE_ITEM(S3C2410_REFRESH),
+#endif
+	SAVE_ITEM(S3C2410_UPLLCON),
+	SAVE_ITEM(S3C2410_CLKSLOW),
+};
+
+static struct sleep_save misc_save[] = {
+	SAVE_ITEM(S3C2410_DCLKCON),
+};
+
+/* s3c_pm_check_resume_pin
+ *
+ * check to see if the pin is configured correctly for sleep mode, and
+ * make any necessary adjustments if it is not
+*/
+
+static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
+{
+	unsigned long irqstate;
+	unsigned long pinstate;
+	int irq = gpio_to_irq(pin);
+
+	if (irqoffs < 4)
+		irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
+	else
+		irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
+
+	pinstate = s3c_gpio_getcfg(pin);
+
+	if (!irqstate) {
+		if (pinstate == S3C2410_GPIO_IRQ)
+			S3C_PMDBG("Leaving IRQ %d (pin %d) as is\n", irq, pin);
+	} else {
+		if (pinstate == S3C2410_GPIO_IRQ) {
+			S3C_PMDBG("Disabling IRQ %d (pin %d)\n", irq, pin);
+			s3c_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
+		}
+	}
+}
+
+/* s3c_pm_configure_extint
+ *
+ * configure all external interrupt pins
+*/
+
+void s3c_pm_configure_extint(void)
+{
+	int pin;
+
+	/* for each of the external interrupts (EINT0..EINT15) we
+	 * need to check wether it is an external interrupt source,
+	 * and then configure it as an input if it is not
+	*/
+
+	for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
+		s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
+	}
+
+	for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
+		s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
+	}
+}
+
+
+void s3c_pm_restore_core(void)
+{
+	s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
+	s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save));
+}
+
+void s3c_pm_save_core(void)
+{
+	s3c_pm_do_save(misc_save, ARRAY_SIZE(misc_save));
+	s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
+}
+
-- 
cgit