From 3387cbae6318b9e030323a76da64a2951328e93b Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 22 Mar 2009 18:33:08 +0000
Subject: [PATCH] atheros: fix gpio interrupt handling on 2315

SVN-Revision: 14973
---
 .../atheros/patches-2.6.28/100-board.patch    | 56 +++++++++++--------
 .../patches-2.6.28/105-ar2315_pci.patch       |  6 +-
 2 files changed, 36 insertions(+), 26 deletions(-)

diff --git a/target/linux/atheros/patches-2.6.28/100-board.patch b/target/linux/atheros/patches-2.6.28/100-board.patch
index 2f7bb5b196eb..7c4fad18545a 100644
--- a/target/linux/atheros/patches-2.6.28/100-board.patch
+++ b/target/linux/atheros/patches-2.6.28/100-board.patch
@@ -2096,7 +2096,7 @@
 +
 --- /dev/null
 +++ b/arch/mips/ar231x/ar2315.c
-@@ -0,0 +1,663 @@
+@@ -0,0 +1,673 @@
 +/*
 + * This file is subject to the terms and conditions of the GNU General Public
 + * License.  See the file "COPYING" in the main directory of this archive
@@ -2142,22 +2142,24 @@
 +static inline void ar2315_gpio_irq(void)
 +{
 +	u32 pend;
-+	int bit;
++	int bit = -1;
 +
 +	/* only do one gpio interrupt at a time */
 +	pend = (ar231x_read_reg(AR2315_GPIO_DI) ^ gpiointval) & gpiointmask;
-+	if (!pend)
-+		return;
 +
-+	bit = fls(pend);
-+	pend ^= (1 << bit);
-+	gpiointval ^= (1 << bit);
++	if (pend) {
++		bit = fls(pend) - 1;
++		printk("GPIO IRQ: pend=0x%08x, val=%08x, bit=%d\n", pend, gpiointval, bit);
++		pend &= ~(1 << bit);
++		gpiointval ^= (1 << bit);
++		printk("AFTER IRQ: pend=0x%08x, val=%08x, bit=%d\n", pend, gpiointval, bit);
++	}
 +
-+	/* ACK the interrupt only if we handled all bits */
 +	if (!pend)
-+		ar231x_write_reg(AR2315_ISR, ar231x_read_reg(AR2315_IMR) | ~AR2315_ISR_GPIO);
++		ar231x_write_reg(AR2315_ISR, AR2315_ISR_GPIO);
 +
-+	do_IRQ(AR531X_GPIO_IRQ_BASE + fls(pend) - 1);
++	if (bit >= 0)
++		do_IRQ(AR531X_GPIO_IRQ_BASE + bit);
 +}
 +
 +
@@ -2203,7 +2205,6 @@
 +{
 +	u32 reg;
 +
-+
 +	reg = ar231x_read_reg(AR2315_GPIO_INT);
 +	reg &= ~(AR2315_GPIO_INT_M | AR2315_GPIO_INT_LVL_M);
 +	reg |= gpio | AR2315_GPIO_INT_LVL(level);
@@ -2213,17 +2214,12 @@
 +static void ar2315_gpio_intr_enable(unsigned int irq)
 +{
 +	unsigned int gpio = irq - AR531X_GPIO_IRQ_BASE;
-+	u32 reg;
-+
-+	gpiointmask &= ~(1 << gpio);
 +
 +	/* reconfigure GPIO line as input */
-+	reg = ar231x_read_reg(AR2315_GPIO_CR);
-+	reg &= ~(AR2315_GPIO_CR_M(gpio));
-+	reg |= AR2315_GPIO_CR_I(gpio);
-+	ar231x_write_reg(AR2315_GPIO_CR, reg);
++	ar231x_mask_reg(AR2315_GPIO_CR, AR2315_GPIO_CR_M(gpio), AR2315_GPIO_CR_I(gpio));
 +
 +	/* Enable interrupt with edge detection */
++	gpiointmask |= (1 << gpio);
 +	ar2315_set_gpiointmask(gpio, 3);
 +}
 +
@@ -2231,19 +2227,33 @@
 +{
 +	unsigned int gpio = irq - AR531X_GPIO_IRQ_BASE;
 +
-+	gpiointmask |= (1 << gpio);
-+
 +	/* Disable interrupt */
++	gpiointmask &= ~(1 << gpio);
 +	ar2315_set_gpiointmask(gpio, 0);
 +}
 +
++static unsigned int
++ar2315_gpio_intr_startup(unsigned int irq)
++{
++	ar2315_gpio_intr_enable(irq);
++	return 0;
++}
++
++static void
++ar2315_gpio_intr_end(unsigned int irq)
++{
++	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
++		ar2315_gpio_intr_enable(irq);
++}
++
 +static struct irq_chip ar2315_gpio_intr_controller = {
 +	.typename	= "AR2315-GPIO",
++	.startup  = ar2315_gpio_intr_startup,
++	.shutdown = ar2315_gpio_intr_disable,
++	.enable   = ar2315_gpio_intr_enable,
 +	.disable  = ar2315_gpio_intr_disable,
 +	.ack      = ar2315_gpio_intr_disable,
-+	.mask_ack = ar2315_gpio_intr_disable,
-+	.unmask   = ar2315_gpio_intr_enable,
-+	.eoi   = ar2315_gpio_intr_enable,
++	.end      = ar2315_gpio_intr_end,
 +};
 +
 +static void
diff --git a/target/linux/atheros/patches-2.6.28/105-ar2315_pci.patch b/target/linux/atheros/patches-2.6.28/105-ar2315_pci.patch
index 389a0ec21489..69c334923068 100644
--- a/target/linux/atheros/patches-2.6.28/105-ar2315_pci.patch
+++ b/target/linux/atheros/patches-2.6.28/105-ar2315_pci.patch
@@ -257,8 +257,8 @@
 +	default y
 --- a/arch/mips/ar231x/ar2315.c
 +++ b/arch/mips/ar231x/ar2315.c
-@@ -61,6 +61,27 @@ static inline void ar2315_gpio_irq(void)
- 	do_IRQ(AR531X_GPIO_IRQ_BASE + fls(pend) - 1);
+@@ -63,6 +63,27 @@ static inline void ar2315_gpio_irq(void)
+ 		do_IRQ(AR531X_GPIO_IRQ_BASE + bit);
  }
  
 +#ifdef CONFIG_ATHEROS_AR2315_PCI
@@ -285,7 +285,7 @@
  
  /*
   * Called when an interrupt is received, this function
-@@ -79,6 +100,10 @@ ar2315_irq_dispatch(void)
+@@ -81,6 +102,10 @@ ar2315_irq_dispatch(void)
  		do_IRQ(AR2315_IRQ_WLAN0_INTRS);
  	else if (pending & CAUSEF_IP4)
  		do_IRQ(AR2315_IRQ_ENET0_INTRS);
-- 
2.30.2