Blackfin arch: Allow a gpio pin be requested both as gpio and irq.

[Mike Frysinger <vapier.adi@gmail.com>:
 - use KERN_NOTICE when using gpios as both irq and non
   rather than KERN_ERR
 - embedded newlines in printk() does not fly]
Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/include/asm/gpio.h

@@ -548,6 +548,8 @@ struct gpio_port_s {
 
 int bfin_gpio_request(unsigned gpio, const char *label);
 void bfin_gpio_free(unsigned gpio);
+int bfin_gpio_irq_request(unsigned gpio, const char *label);
+void bfin_gpio_irq_free(unsigned gpio);
 int bfin_gpio_direction_input(unsigned gpio);
 int bfin_gpio_direction_output(unsigned gpio, int value);
 int bfin_gpio_get_value(unsigned gpio);

arch/blackfin/kernel/bfin_gpio.c

@@ -179,6 +179,7 @@ static struct gpio_port_t *gpio_array[] = {
 
 static unsigned short reserved_gpio_map[GPIO_BANK_NUM];
 static unsigned short reserved_peri_map[gpio_bank(MAX_RESOURCES)];
+static unsigned short reserved_gpio_irq_map[GPIO_BANK_NUM];
 
 #define RESOURCE_LABEL_SIZE 	16
 
@@ -1043,7 +1044,7 @@ int bfin_gpio_request(unsigned gpio, const char *label)
 	if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
 		dump_stack();
 		printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
-			 gpio, get_label(gpio));
+		       gpio, get_label(gpio));
 		local_irq_restore(flags);
 		return -EBUSY;
 	}
@@ -1055,13 +1056,16 @@ int bfin_gpio_request(unsigned gpio, const char *label)
 		local_irq_restore(flags);
 		return -EBUSY;
 	}
+	if (unlikely(reserved_gpio_irq_map[gpio_bank(gpio)] & gpio_bit(gpio)))
+		printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved as gpio-irq!"
+		       " (Documentation/blackfin/bfin-gpio-notes.txt)\n", gpio);
 
 	reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
+	set_label(gpio, label);
 
 	local_irq_restore(flags);
 
 	port_setup(gpio, GPIO_USAGE);
-	set_label(gpio, label);
 
 	return 0;
 }
@@ -1091,6 +1095,69 @@ void bfin_gpio_free(unsigned gpio)
 }
 EXPORT_SYMBOL(bfin_gpio_free);
 
+int bfin_gpio_irq_request(unsigned gpio, const char *label)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return -EINVAL;
+
+	local_irq_save(flags);
+
+	if (unlikely(reserved_gpio_irq_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+		dump_stack();
+		printk(KERN_ERR
+		       "bfin-gpio: GPIO %d is already reserved as gpio-irq !\n",
+		       gpio);
+		local_irq_restore(flags);
+		return -EBUSY;
+	}
+	if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+		dump_stack();
+		printk(KERN_ERR
+		       "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
+		       gpio, get_label(gpio));
+		local_irq_restore(flags);
+		return -EBUSY;
+	}
+	if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))
+		printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved by %s! "
+		       "(Documentation/blackfin/bfin-gpio-notes.txt)\n",
+		       gpio, get_label(gpio));
+
+	reserved_gpio_irq_map[gpio_bank(gpio)] |= gpio_bit(gpio);
+	set_label(gpio, label);
+
+	local_irq_restore(flags);
+
+	port_setup(gpio, GPIO_USAGE);
+
+	return 0;
+}
+
+void bfin_gpio_irq_free(unsigned gpio)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return;
+
+	local_irq_save(flags);
+
+	if (unlikely(!(reserved_gpio_irq_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
+		dump_stack();
+		gpio_error(gpio);
+		local_irq_restore(flags);
+		return;
+	}
+
+	reserved_gpio_irq_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+
+	set_label(gpio, "free");
+
+	local_irq_restore(flags);
+}
+
 
 #ifdef BF548_FAMILY
 int bfin_gpio_direction_input(unsigned gpio)
@@ -1253,12 +1320,15 @@ void bfin_gpio_irq_prepare(unsigned gpio)
 static int gpio_proc_read(char *buf, char **start, off_t offset,
 			  int len, int *unused_i, void *unused_v)
 {
-	int c, outlen = 0;
+	int c, irq, gpio, outlen = 0;
 
 	for (c = 0; c < MAX_RESOURCES; c++) {
-		if (!check_gpio(c) && (reserved_gpio_map[gpio_bank(c)] & gpio_bit(c)))
-			len = sprintf(buf, "GPIO_%d: \t%s \t\tGPIO %s\n", c,
-				 get_label(c), get_gpio_dir(c) ? "OUTPUT" : "INPUT");
+		irq = reserved_gpio_irq_map[gpio_bank(c)] & gpio_bit(c);
+		gpio = reserved_gpio_map[gpio_bank(c)] & gpio_bit(c);
+		if (!check_gpio(c) && (gpio || irq))
+			len = sprintf(buf, "GPIO_%d: \t%s%s \t\tGPIO %s\n", c,
+				 get_label(c), (gpio && irq) ? " *" : "",
+				 get_gpio_dir(c) ? "OUTPUT" : "INPUT");
 		else if (reserved_peri_map[gpio_bank(c)] & gpio_bit(c))
 			len = sprintf(buf, "GPIO_%d: \t%s \t\tPeripheral\n", c, get_label(c));
 		else

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

@@ -432,7 +432,7 @@ static void bfin_gpio_irq_shutdown(unsigned int irq)
 
 	bfin_gpio_mask_irq(irq);
 	__clear_bit(gpionr, gpio_enabled);
-	bfin_gpio_free(gpionr);
+	bfin_gpio_irq_free(gpionr);
 }
 
 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
@@ -441,11 +441,6 @@ static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 	char buf[16];
 	u32 gpionr = irq_to_gpio(irq);
 
-	snprintf(buf, 16, "gpio-irq%d", irq);
-	ret = bfin_gpio_request(gpionr, buf);
-	if (ret)
-		return ret;
-
 	if (type == IRQ_TYPE_PROBE) {
 		/* only probe unenabled GPIO interrupt lines */
 		if (__test_bit(gpionr, gpio_enabled))
@@ -456,6 +451,11 @@ 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)) {
 
+		snprintf(buf, 16, "gpio-irq%d", irq);
+		ret = bfin_gpio_irq_request(gpionr, buf);
+		if (ret)
+			return ret;
+
 		if (__test_and_set_bit(gpionr, gpio_enabled))
 			bfin_gpio_irq_prepare(gpionr);
 
@@ -740,7 +740,7 @@ static void bfin_gpio_irq_shutdown(unsigned int irq)
 
 	bfin_gpio_mask_irq(irq);
 	__clear_bit(gpionr, gpio_enabled);
-	bfin_gpio_free(gpionr);
+	bfin_gpio_irq_free(gpionr);
 }
 
 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
@@ -755,11 +755,6 @@ static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 	if (pint_val == IRQ_NOT_AVAIL)
 		return -ENODEV;
 
-	snprintf(buf, 16, "gpio-irq%d", irq);
-	ret = bfin_gpio_request(gpionr, buf);
-	if (ret)
-		return ret;
-
 	if (type == IRQ_TYPE_PROBE) {
 		/* only probe unenabled GPIO interrupt lines */
 		if (__test_bit(gpionr, gpio_enabled))
@@ -769,6 +764,12 @@ 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)) {
+
+		snprintf(buf, 16, "gpio-irq%d", irq);
+		ret = bfin_gpio_irq_request(gpionr, buf);
+		if (ret)
+			return ret;
+
 		if (__test_and_set_bit(gpionr, gpio_enabled))
 			bfin_gpio_irq_prepare(gpionr);