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>

arch/blackfin/include/asm/gpio.h

@@ -119,6 +119,10 @@ struct gpio_port_t {
 #ifdef BFIN_SPECIAL_GPIO_BANKS
 void bfin_special_gpio_free(unsigned gpio);
 int bfin_special_gpio_request(unsigned gpio, const char *label);
+# ifdef CONFIG_PM
+void bfin_special_gpio_pm_hibernate_restore(void);
+void bfin_special_gpio_pm_hibernate_suspend(void);
+# endif
 #endif
 
 #ifdef CONFIG_PM

arch/blackfin/kernel/bfin_gpio.c

@@ -118,6 +118,9 @@ static struct str_ident {
 
 #if defined(CONFIG_PM)
 static struct gpio_port_s gpio_bank_saved[GPIO_BANK_NUM];
+# ifdef BF538_FAMILY
+static unsigned short port_fer_saved[3];
+# endif
 #endif
 
 static void gpio_error(unsigned gpio)
@@ -604,6 +607,11 @@ void bfin_gpio_pm_hibernate_suspend(void)
 {
 	int i, bank;
 
+#ifdef BF538_FAMILY
+	for (i = 0; i < ARRAY_SIZE(port_fer_saved); ++i)
+		port_fer_saved[i] = *port_fer[i];
+#endif
+
 	for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 		bank = gpio_bank(i);
 
@@ -625,6 +633,10 @@ void bfin_gpio_pm_hibernate_suspend(void)
 		gpio_bank_saved[bank].maska = gpio_array[bank]->maska;
 	}
 
+#ifdef BFIN_SPECIAL_GPIO_BANKS
+	bfin_special_gpio_pm_hibernate_suspend();
+#endif
+
 	AWA_DUMMY_READ(maska);
 }
 
@@ -632,6 +644,11 @@ void bfin_gpio_pm_hibernate_restore(void)
 {
 	int i, bank;
 
+#ifdef BF538_FAMILY
+	for (i = 0; i < ARRAY_SIZE(port_fer_saved); ++i)
+		*port_fer[i] = port_fer_saved[i];
+#endif
+
 	for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 		bank = gpio_bank(i);
 
@@ -653,6 +670,11 @@ void bfin_gpio_pm_hibernate_restore(void)
 		gpio_array[bank]->both  = gpio_bank_saved[bank].both;
 		gpio_array[bank]->maska = gpio_bank_saved[bank].maska;
 	}
+
+#ifdef BFIN_SPECIAL_GPIO_BANKS
+	bfin_special_gpio_pm_hibernate_restore();
+#endif
+
 	AWA_DUMMY_READ(maska);
 }
 

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

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

arch/blackfin/mach-common/dpmc_modes.S

@@ -459,24 +459,6 @@ ENTRY(_do_hibernate)
 	PM_PUSH_SYNC(9)
 #endif
 
-#ifdef PORTCIO_FER
-	/* 16bit loads can only be done with dregs */
-	PM_SYS_PUSH16(0, PORTCIO_DIR)
-	PM_SYS_PUSH16(1, PORTCIO_INEN)
-	PM_SYS_PUSH16(2, PORTCIO)
-	PM_SYS_PUSH16(3, PORTCIO_FER)
-	PM_SYS_PUSH16(4, PORTDIO_DIR)
-	PM_SYS_PUSH16(5, PORTDIO_INEN)
-	PM_SYS_PUSH16(6, PORTDIO)
-	PM_SYS_PUSH16(7, PORTDIO_FER)
-	PM_PUSH_SYNC(7)
-	PM_SYS_PUSH16(0, PORTEIO_DIR)
-	PM_SYS_PUSH16(1, PORTEIO_INEN)
-	PM_SYS_PUSH16(2, PORTEIO)
-	PM_SYS_PUSH16(3, PORTEIO_FER)
-	PM_PUSH_SYNC(3)
-#endif
-
 	/* Save Core MMRs */
 	I0.H = hi(COREMMR_BASE);
 	I0.L = lo(COREMMR_BASE);
@@ -777,23 +759,6 @@ ENTRY(_do_hibernate)
 	FP.H = hi(SYSMMR_BASE);
 	FP.L = lo(SYSMMR_BASE);
 
-#ifdef PORTCIO_FER
-	PM_POP_SYNC(3)
-	PM_SYS_POP16(3, PORTEIO_FER)
-	PM_SYS_POP16(2, PORTEIO)
-	PM_SYS_POP16(1, PORTEIO_INEN)
-	PM_SYS_POP16(0, PORTEIO_DIR)
-	PM_POP_SYNC(7)
-	PM_SYS_POP16(7, PORTDIO_FER)
-	PM_SYS_POP16(6, PORTDIO)
-	PM_SYS_POP16(5, PORTDIO_INEN)
-	PM_SYS_POP16(4, PORTDIO_DIR)
-	PM_SYS_POP16(3, PORTCIO_FER)
-	PM_SYS_POP16(2, PORTCIO)
-	PM_SYS_POP16(1, PORTCIO_INEN)
-	PM_SYS_POP16(0, PORTCIO_DIR)
-#endif
-
 #ifdef EBIU_FCTL
 	PM_POP_SYNC(12)
 	PM_SYS_POP(12, EBIU_FCTL)