From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 12:05:51 +0200
Subject: Adding upstream version 5.10.209.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/arm/mach-s3c/pm-s3c24xx.c | 121 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 arch/arm/mach-s3c/pm-s3c24xx.c

(limited to 'arch/arm/mach-s3c/pm-s3c24xx.c')

diff --git a/arch/arm/mach-s3c/pm-s3c24xx.c b/arch/arm/mach-s3c/pm-s3c24xx.c
new file mode 100644
index 000000000..3a8f5c388
--- /dev/null
+++ b/arch/arm/mach-s3c/pm-s3c24xx.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// 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.rst for more information
+//
+// 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/serial_s3c.h>
+#include <linux/io.h>
+
+#include "regs-clock.h"
+#include "regs-gpio.h"
+#include "regs-irq.h"
+#include "gpio-samsung.h"
+
+#include <asm/mach/time.h>
+
+#include "gpio-cfg.h"
+#include "pm.h"
+
+#include "regs-mem-s3c24xx.h"
+
+#define PFX "s3c24xx-pm: "
+
+#ifdef CONFIG_PM_SLEEP
+static struct sleep_save core_save[] = {
+	/* 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),
+};
+#endif
+
+/* 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 whether 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);
+	}
+}
+
+#ifdef CONFIG_PM_SLEEP
+void s3c_pm_restore_core(void)
+{
+	s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
+}
+
+void s3c_pm_save_core(void)
+{
+	s3c_pm_do_save(core_save, ARRAY_SIZE(core_save));
+}
+#endif
-- 
cgit v1.2.3