[Blackfin] arch: Allow concurrent use of GPIO and GPIO IRQ

The irq setup code no longer calls gpio request and free.
This patch also changes the default gpio_free behavior on Blackfin.
A freed GPIO keeps it's last state, and is not defaulted back to
an input. This is also what all other architectures do.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/bfin_gpio.c

@@ -395,32 +395,6 @@ inline void portmux_setup(unsigned short portno, unsigned short function)
 # define portmux_setup(...)  do { } while (0)
 #endif
 
-#ifndef BF548_FAMILY
-static void default_gpio(unsigned gpio)
-{
-	unsigned short bank, bitmask;
-	unsigned long flags;
-
-	bank = gpio_bank(gpio);
-	bitmask = gpio_bit(gpio);
-
-	local_irq_save(flags);
-
-	gpio_bankb[bank]->maska_clear = bitmask;
-	gpio_bankb[bank]->maskb_clear = bitmask;
-	SSYNC();
-	gpio_bankb[bank]->inen &= ~bitmask;
-	gpio_bankb[bank]->dir &= ~bitmask;
-	gpio_bankb[bank]->polar &= ~bitmask;
-	gpio_bankb[bank]->both &= ~bitmask;
-	gpio_bankb[bank]->edge &= ~bitmask;
-	AWA_DUMMY_READ(edge);
-	local_irq_restore(flags);
-}
-#else
-# define default_gpio(...)  do { } while (0)
-#endif
-
 static int __init bfin_gpio_init(void)
 {
 	printk(KERN_INFO "Blackfin GPIO Controller\n");
@@ -1080,8 +1054,6 @@ void gpio_free(unsigned gpio)
 		return;
 	}
 
-	default_gpio(gpio);
-
 	reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
 
 	set_label(gpio, "free");
@@ -1144,6 +1116,18 @@ int gpio_get_value(unsigned gpio)
 }
 EXPORT_SYMBOL(gpio_get_value);
 
+void bfin_gpio_irq_prepare(unsigned gpio)
+{
+	unsigned long flags;
+
+	port_setup(gpio, GPIO_USAGE);
+
+	local_irq_save(flags);
+	gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
+	gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
+	local_irq_restore(flags);
+}
+
 #else
 
 int gpio_direction_input(unsigned gpio)
@@ -1210,6 +1194,11 @@ void bfin_gpio_reset_spi0_ssel1(void)
 	udelay(1);
 }
 
+void bfin_gpio_irq_prepare(unsigned gpio)
+{
+	port_setup(gpio, GPIO_USAGE);
+}
+
 #endif /*BF548_FAMILY */
 
 #if defined(CONFIG_PROC_FS)

arch/blackfin/mach-common/ints-priority.c

@@ -326,6 +326,7 @@ static void bfin_demux_error_irq(unsigned int int_err_irq,
 static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
 static unsigned short gpio_edge_triggered[gpio_bank(MAX_BLACKFIN_GPIOS)];
 
+extern void bfin_gpio_irq_prepare(unsigned gpio);
 
 static void bfin_gpio_ack_irq(unsigned int irq)
 {
@@ -364,35 +365,25 @@ static void bfin_gpio_unmask_irq(unsigned int irq)
 
 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 {
-	unsigned int ret;
 	u16 gpionr = irq - IRQ_PF0;
-	char buf[8];
 
-	if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
-		snprintf(buf, sizeof buf, "IRQ %d", irq);
-		ret = gpio_request(gpionr, buf);
-		if (ret)
-			return ret;
-	}
+	if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr)))
+		bfin_gpio_irq_prepare(gpionr);
 
 	gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 	bfin_gpio_unmask_irq(irq);
 
-	return ret;
+	return 0;
 }
 
 static void bfin_gpio_irq_shutdown(unsigned int irq)
 {
 	bfin_gpio_mask_irq(irq);
-	gpio_free(irq - IRQ_PF0);
 	gpio_enabled[gpio_bank(irq - IRQ_PF0)] &= ~gpio_bit(irq - IRQ_PF0);
 }
 
 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 {
-
-	unsigned int ret;
-	char buf[8];
 	u16 gpionr = irq - IRQ_PF0;
 
 	if (type == IRQ_TYPE_PROBE) {
@@ -404,12 +395,8 @@ static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 
 	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 		    IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
-		if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
-			snprintf(buf, sizeof buf, "IRQ %d", irq);
-			ret = gpio_request(gpionr, buf);
-			if (ret)
-				return ret;
-		}
+		if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr)))
+			bfin_gpio_irq_prepare(gpionr);
 
 		gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 	} else {
@@ -595,6 +582,8 @@ static struct pin_int_t *pint[NR_PINT_SYS_IRQS] = {
 	(struct pin_int_t *)PINT3_MASK_SET,
 };
 
+extern void bfin_gpio_irq_prepare(unsigned gpio);
+
 inline unsigned short get_irq_base(u8 bank, u8 bmap)
 {
 
@@ -697,8 +686,6 @@ static void bfin_gpio_unmask_irq(unsigned int irq)
 
 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 {
-	unsigned int ret;
-	char buf[8];
 	u16 gpionr = irq_to_gpio(irq);
 	u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 
@@ -709,17 +696,13 @@ static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 		return -ENODEV;
 	}
 
-	if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
-		snprintf(buf, sizeof buf, "IRQ %d", irq);
-		ret = gpio_request(gpionr, buf);
-		if (ret)
-			return ret;
-	}
+	if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr)))
+		bfin_gpio_irq_prepare(gpionr);
 
 	gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 	bfin_gpio_unmask_irq(irq);
 
-	return ret;
+	return 0;
 }
 
 static void bfin_gpio_irq_shutdown(unsigned int irq)
@@ -727,15 +710,12 @@ static void bfin_gpio_irq_shutdown(unsigned int irq)
 	u16 gpionr = irq_to_gpio(irq);
 
 	bfin_gpio_mask_irq(irq);
-	gpio_free(gpionr);
 	gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
 }
 
 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 {
 
-	unsigned int ret;
-	char buf[8];
 	u16 gpionr = irq_to_gpio(irq);
 	u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 	u32 pintbit = PINT_BIT(pint_val);
@@ -753,12 +733,8 @@ static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 
 	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 		    IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
-		if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
-			snprintf(buf, sizeof buf, "IRQ %d", irq);
-			ret = gpio_request(gpionr, buf);
-			if (ret)
-				return ret;
-		}
+		if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr)))
+			bfin_gpio_irq_prepare(gpionr);
 
 		gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 	} else {
@@ -766,8 +742,6 @@ static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 		return 0;
 	}
 
-	gpio_direction_input(gpionr);
-
 	if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 		pint[bank]->invert_set = pintbit;	/* low or falling edge denoted by one */
 	else