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authorMike Frysinger <vapier@gentoo.org>2011-06-27 20:46:14 +0200
committerMike Frysinger <vapier@gentoo.org>2011-07-23 07:18:30 +0200
commit9466a0510a5445d81eaf33affc20e2f7e2e718fb (patch)
treeecbecd217aedca3575d27444efeadf1fee1c8f38 /arch/blackfin/mach-bf538
parentBlackfin: dpmc: optimize hibernate/resume path (diff)
downloadlinux-9466a0510a5445d81eaf33affc20e2f7e2e718fb.tar.xz
linux-9466a0510a5445d81eaf33affc20e2f7e2e718fb.zip
Blackfin: bf538: pull gpio/port logic out of core hibernate paths
Re-architect how we save/restore the gpio/port logic that only pertains to bf538/bf539 parts by pulling it out of the core code paths and pushing it out to bf538-specific locations. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/mach-bf538')
-rw-r--r--arch/blackfin/mach-bf538/ext-gpio.c37
-rw-r--r--arch/blackfin/mach-bf538/include/mach/gpio.h3
2 files changed, 39 insertions, 1 deletions
diff --git a/arch/blackfin/mach-bf538/ext-gpio.c b/arch/blackfin/mach-bf538/ext-gpio.c
index 180b1252679f..471a9b184d5b 100644
--- a/arch/blackfin/mach-bf538/ext-gpio.c
+++ b/arch/blackfin/mach-bf538/ext-gpio.c
@@ -1,7 +1,7 @@
/*
* GPIOLIB interface for BF538/9 PORT C, D, and E GPIOs
*
- * Copyright 2009 Analog Devices Inc.
+ * Copyright 2009-2011 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
@@ -121,3 +121,38 @@ static int __init bf538_extgpio_setup(void)
gpiochip_add(&bf538_porte_chip);
}
arch_initcall(bf538_extgpio_setup);
+
+#ifdef CONFIG_PM
+static struct {
+ u16 data, dir, inen;
+} gpio_bank_saved[3];
+
+static void __iomem * const port_bases[3] = {
+ (void *)PORTCIO,
+ (void *)PORTDIO,
+ (void *)PORTEIO,
+};
+
+void bfin_special_gpio_pm_hibernate_suspend(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(port_bases); ++i) {
+ gpio_bank_saved[i].data = read_PORTIO(port_bases[i]);
+ gpio_bank_saved[i].inen = read_PORTIO_INEN(port_bases[i]);
+ gpio_bank_saved[i].dir = read_PORTIO_DIR(port_bases[i]);
+ }
+}
+
+void bfin_special_gpio_pm_hibernate_restore(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(port_bases); ++i) {
+ write_PORTIO_INEN(port_bases[i], gpio_bank_saved[i].inen);
+ write_PORTIO_SET(port_bases[i],
+ gpio_bank_saved[i].data & gpio_bank_saved[i].dir);
+ write_PORTIO_DIR(port_bases[i], gpio_bank_saved[i].dir);
+ }
+}
+#endif
diff --git a/arch/blackfin/mach-bf538/include/mach/gpio.h b/arch/blackfin/mach-bf538/include/mach/gpio.h
index 8a5beeece996..3561c7d8935b 100644
--- a/arch/blackfin/mach-bf538/include/mach/gpio.h
+++ b/arch/blackfin/mach-bf538/include/mach/gpio.h
@@ -8,7 +8,10 @@
#define _MACH_GPIO_H_
#define MAX_BLACKFIN_GPIOS 16
+#ifdef CONFIG_GPIOLIB
+/* We only use the special logic with GPIOLIB devices */
#define BFIN_SPECIAL_GPIO_BANKS 3
+#endif
#define GPIO_PF0 0 /* PF */
#define GPIO_PF1 1