[Blackfin] arch: Enable both edge triggered GPIO IRQs on BF54x and use irq_to_gpio()

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

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

@@ -483,6 +483,10 @@ static void bfin_demux_gpio_irq(unsigned int intb_irq,
 static unsigned char irq2pint_lut[NR_PINTS];
 static unsigned char pint2irq_lut[NR_PINT_SYS_IRQS * NR_PINT_BITS];
 
+static unsigned int gpio_both_edge_triggered[NR_PINT_SYS_IRQS];
+static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
+
+
 struct pin_int_t {
 	unsigned int mask_set;
 	unsigned int mask_clear;
@@ -549,13 +553,20 @@ void init_pint_lut(void)
 
 }
 
-static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
-
 static void bfin_gpio_ack_irq(unsigned int irq)
 {
 	u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
+	u32 pintbit = PINT_BIT(pint_val);
+	u8 bank = PINT_2_BANK(pint_val);
+
+	if (unlikely(gpio_both_edge_triggered[bank] & pintbit)) {
+		if (pint[bank]->invert_set & pintbit)
+			pint[bank]->invert_clear = pintbit;
+		else
+			pint[bank]->invert_set = pintbit;
+	}
+	pint[bank]->request = pintbit;
 
-	pint[PINT_2_BANK(pint_val)]->request = PINT_BIT(pint_val);
 	SSYNC();
 }
 
@@ -565,6 +576,13 @@ static void bfin_gpio_mask_ack_irq(unsigned int irq)
 	u32 pintbit = PINT_BIT(pint_val);
 	u8 bank = PINT_2_BANK(pint_val);
 
+	if (unlikely(gpio_both_edge_triggered[bank] & pintbit)) {
+		if (pint[bank]->invert_set & pintbit)
+			pint[bank]->invert_clear = pintbit;
+		else
+			pint[bank]->invert_set = pintbit;
+	}
+
 	pint[bank]->request = pintbit;
 	pint[bank]->mask_clear = pintbit;
 	SSYNC();
@@ -593,7 +611,7 @@ static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 {
 	unsigned int ret;
 	char buf[8];
-	u16 gpionr = irq - IRQ_PA0;
+	u16 gpionr = irq_to_gpio(irq);
 	u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 
 	if (pint_val == IRQ_NOT_AVAIL) {
@@ -618,9 +636,11 @@ static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 
 static void bfin_gpio_irq_shutdown(unsigned int irq)
 {
+	u16 gpionr = irq_to_gpio(irq);
+
 	bfin_gpio_mask_irq(irq);
-	gpio_free(irq - IRQ_PA0);
-	gpio_enabled[gpio_bank(irq - IRQ_PA0)] &= ~gpio_bit(irq - IRQ_PA0);
+	gpio_free(gpionr);
+	gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
 }
 
 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
@@ -628,7 +648,7 @@ static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 
 	unsigned int ret;
 	char buf[8];
-	u16 gpionr = irq - IRQ_PA0;
+	u16 gpionr = irq_to_gpio(irq);
 	u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 	u32 pintbit = PINT_BIT(pint_val);
 	u8 bank = PINT_2_BANK(pint_val);
@@ -660,28 +680,33 @@ static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 
 	gpio_direction_input(gpionr);
 
-	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
-		pint[bank]->edge_set = pintbit;
-	} else {
-		pint[bank]->edge_clear = pintbit;
-	}
-
 	if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 		pint[bank]->invert_set = pintbit;	/* low or falling edge denoted by one */
 	else
-		pint[bank]->invert_set = pintbit;	/* high or rising edge denoted by zero */
+		pint[bank]->invert_clear = pintbit;	/* high or rising edge denoted by zero */
 
-	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
-		pint[bank]->invert_set = pintbit;
-	else
-		pint[bank]->invert_set = pintbit;
+	if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+	    == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 
-	SSYNC();
+		gpio_both_edge_triggered[bank] |= pintbit;
 
-	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
+		if (gpio_get_value(gpionr))
+			pint[bank]->invert_set = pintbit;
+		else
+			pint[bank]->invert_clear = pintbit;
+	} else {
+		gpio_both_edge_triggered[bank] &= ~pintbit;
+	}
+
+	if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
+		pint[bank]->edge_set = pintbit;
 		set_irq_handler(irq, handle_edge_irq);
-	else
+	} else {
+		pint[bank]->edge_clear = pintbit;
 		set_irq_handler(irq, handle_level_irq);
+	}
+
+	SSYNC();
 
 	return 0;
 }