[MIPS] Add GT641xx IRQ routines.

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

8 files changed, 189 insertions, 109 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ebc7b4b45c8..90b409d0615 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -64,6 +64,7 @@ config MIPS_COBALT
 	select HW_HAS_PCI
 	select I8259
 	select IRQ_CPU
+	select IRQ_GT641XX
 	select PCI_GT64XXX_PCI0
 	select SYS_HAS_CPU_NEVADA
 	select SYS_HAS_EARLY_PRINTK
@@ -806,6 +807,9 @@ config IRQ_MSP_CIC
 config IRQ_TXX9
 	bool
 
+config IRQ_GT641XX
+	bool
+
 config MIPS_BOARDS_GEN
 	bool
 
diff --git a/arch/mips/cobalt/irq.c b/arch/mips/cobalt/irq.c
index 48763cd10ea..ac4fb912649 100644
--- a/arch/mips/cobalt/irq.c
+++ b/arch/mips/cobalt/irq.c
@@ -15,104 +15,48 @@
 
 #include <asm/i8259.h>
 #include <asm/irq_cpu.h>
+#include <asm/irq_gt641xx.h>
 #include <asm/gt64120.h>
 
-#include <cobalt.h>
-
-/*
- * We have two types of interrupts that we handle, ones that come in through
- * the CPU interrupt lines, and ones that come in on the via chip. The CPU
- * mappings are:
- *
- *    16   - Software interrupt 0 (unused)	IE_SW0
- *    17   - Software interrupt 1 (unused)	IE_SW1
- *    18   - Galileo chip (timer)		IE_IRQ0
- *    19   - Tulip 0 + NCR SCSI			IE_IRQ1
- *    20   - Tulip 1				IE_IRQ2
- *    21   - 16550 UART				IE_IRQ3
- *    22   - VIA southbridge PIC		IE_IRQ4
- *    23   - unused				IE_IRQ5
- *
- * The VIA chip is a master/slave 8259 setup and has the following interrupts:
- *
- *     8  - RTC
- *     9  - PCI
- *    14  - IDE0
- *    15  - IDE1
- */
-
-static inline void galileo_irq(void)
-{
-	unsigned int mask, pending, devfn;
-
-	mask = GT_READ(GT_INTRMASK_OFS);
-	pending = GT_READ(GT_INTRCAUSE_OFS) & mask;
-
-	if (pending & GT_INTR_T0EXP_MSK) {
-		GT_WRITE(GT_INTRCAUSE_OFS, ~GT_INTR_T0EXP_MSK);
-		do_IRQ(COBALT_GALILEO_IRQ);
-	} else if (pending & GT_INTR_RETRYCTR0_MSK) {
-		devfn = GT_READ(GT_PCI0_CFGADDR_OFS) >> 8;
-		GT_WRITE(GT_INTRCAUSE_OFS, ~GT_INTR_RETRYCTR0_MSK);
-		printk(KERN_WARNING
-		       "Galileo: PCI retry count exceeded (%02x.%u)\n",
-		       PCI_SLOT(devfn), PCI_FUNC(devfn));
-	} else {
-		GT_WRITE(GT_INTRMASK_OFS, mask & ~pending);
-		printk(KERN_WARNING
-		       "Galileo: masking unexpected interrupt %08x\n", pending);
-	}
-}
-
-static inline void via_pic_irq(void)
-{
-	int irq;
-
-	irq = i8259_irq();
-	if (irq >= 0)
-		do_IRQ(irq);
-}
+#include <irq.h>
 
 asmlinkage void plat_irq_dispatch(void)
 {
-	unsigned pending = read_c0_status() & read_c0_cause();
+	unsigned pending = read_c0_status() & read_c0_cause() & ST0_IM;
+	int irq;
 
-	if (pending & CAUSEF_IP2)		/* COBALT_GALILEO_IRQ (18) */
-		galileo_irq();
-	else if (pending & CAUSEF_IP6)		/* COBALT_VIA_IRQ (22) */
-		via_pic_irq();
-	else if (pending & CAUSEF_IP3)		/* COBALT_ETH0_IRQ (19) */
-		do_IRQ(COBALT_CPU_IRQ + 3);
-	else if (pending & CAUSEF_IP4)		/* COBALT_ETH1_IRQ (20) */
-		do_IRQ(COBALT_CPU_IRQ + 4);
-	else if (pending & CAUSEF_IP5)		/* COBALT_SERIAL_IRQ (21) */
-		do_IRQ(COBALT_CPU_IRQ + 5);
-	else if (pending & CAUSEF_IP7)		/* IRQ 23 */
-		do_IRQ(COBALT_CPU_IRQ + 7);
+	if (pending & CAUSEF_IP2)
+		gt641xx_irq_dispatch();
+	else if (pending & CAUSEF_IP6) {
+		irq = i8259_irq();
+		if (irq < 0)
+			spurious_interrupt();
+		else
+			do_IRQ(irq);
+	} else if (pending & CAUSEF_IP3)
+		do_IRQ(MIPS_CPU_IRQ_BASE + 3);
+	else if (pending & CAUSEF_IP4)
+		do_IRQ(MIPS_CPU_IRQ_BASE + 4);
+	else if (pending & CAUSEF_IP5)
+		do_IRQ(MIPS_CPU_IRQ_BASE + 5);
+	else if (pending & CAUSEF_IP7)
+		do_IRQ(MIPS_CPU_IRQ_BASE + 7);
+	else
+		spurious_interrupt();
 }
 
-static struct irqaction irq_via = {
-	.handler = no_action,
-	.mask = CPU_MASK_NONE,
-	.name = "cascade"
+static struct irqaction cascade = {
+	.handler	= no_action,
+	.mask		= CPU_MASK_NONE,
+	.name		= "cascade",
 };
 
 void __init arch_init_irq(void)
 {
-	/*
-	 * Mask all Galileo interrupts. The Galileo
-	 * handler is set in cobalt_timer_setup()
-	 */
-	GT_WRITE(GT_INTRMASK_OFS, 0);
-
-	init_i8259_irqs();				/*  0 ... 15 */
-	mips_cpu_irq_init();		/* 16 ... 23 */
-
-	/*
-	 * Mask all cpu interrupts
-	 *  (except IE4, we already masked those at VIA level)
-	 */
-	change_c0_status(ST0_IM, IE_IRQ4);
+	mips_cpu_irq_init();
+	gt641xx_irq_init();
+	init_i8259_irqs();
 
-	setup_irq(COBALT_VIA_IRQ, &irq_via);
+	setup_irq(GT641XX_CASCADE_IRQ, &cascade);
+	setup_irq(I8259_CASCADE_IRQ, &cascade);
 }
diff --git a/arch/mips/cobalt/rtc.c b/arch/mips/cobalt/rtc.c
index 284daefc5c5..e70794b8bcb 100644
--- a/arch/mips/cobalt/rtc.c
+++ b/arch/mips/cobalt/rtc.c
@@ -20,6 +20,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
+#include <linux/mc146818rtc.h>
 #include <linux/platform_device.h>
 
 static struct resource cobalt_rtc_resource[] __initdata = {
@@ -29,8 +30,8 @@ static struct resource cobalt_rtc_resource[] __initdata = {
 		.flags	= IORESOURCE_IO,
 	},
 	{
-		.start	= 8,
-		.end	= 8,
+		.start	= RTC_IRQ,
+		.end	= RTC_IRQ,
 		.flags	= IORESOURCE_IRQ,
 	},
 };
diff --git a/arch/mips/cobalt/serial.c b/arch/mips/cobalt/serial.c
index 08e739704cc..53b8d0d6da9 100644
--- a/arch/mips/cobalt/serial.c
+++ b/arch/mips/cobalt/serial.c
@@ -24,6 +24,7 @@
 #include <linux/serial_8250.h>
 
 #include <cobalt.h>
+#include <irq.h>
 
 static struct resource cobalt_uart_resource[] __initdata = {
 	{
@@ -32,15 +33,15 @@ static struct resource cobalt_uart_resource[] __initdata = {
 		.flags	= IORESOURCE_MEM,
 	},
 	{
-		.start	= COBALT_SERIAL_IRQ,
-		.end	= COBALT_SERIAL_IRQ,
+		.start	= SERIAL_IRQ,
+		.end	= SERIAL_IRQ,
 		.flags	= IORESOURCE_IRQ,
 	},
 };
 
 static struct plat_serial8250_port cobalt_serial8250_port[] = {
 	{
-		.irq		= COBALT_SERIAL_IRQ,
+		.irq		= SERIAL_IRQ,
 		.uartclk	= 18432000,
 		.iotype		= UPIO_MEM,
 		.flags		= UPF_IOREMAP | UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
diff --git a/arch/mips/cobalt/setup.c b/arch/mips/cobalt/setup.c
index 7abe45e7842..fc9cbb251ed 100644
--- a/arch/mips/cobalt/setup.c
+++ b/arch/mips/cobalt/setup.c
@@ -20,6 +20,7 @@
 #include <asm/gt64120.h>
 
 #include <cobalt.h>
+#include <irq.h>
 
 extern void cobalt_machine_restart(char *command);
 extern void cobalt_machine_halt(void);
@@ -45,14 +46,10 @@ void __init plat_timer_setup(struct irqaction *irq)
 	/* Load timer value for HZ (TCLK is 50MHz) */
 	GT_WRITE(GT_TC0_OFS, 50*1000*1000 / HZ);
 
-	/* Enable timer */
+	/* Enable timer0 */
 	GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
 
-	/* Register interrupt */
-	setup_irq(COBALT_GALILEO_IRQ, irq);
-
-	/* Enable interrupt */
-	GT_WRITE(GT_INTRMASK_OFS, GT_INTR_T0EXP_MSK | GT_READ(GT_INTRMASK_OFS));
+	setup_irq(GT641XX_TIMER0_IRQ, irq);
 }
 
 /*
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 2fd96d95a39..7851b4b447d 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_IRQ_CPU_RM7K)	+= irq-rm7000.o
 obj-$(CONFIG_IRQ_CPU_RM9K)	+= irq-rm9000.o
 obj-$(CONFIG_MIPS_BOARDS_GEN)	+= irq-msc01.o
 obj-$(CONFIG_IRQ_TXX9)		+= irq_txx9.o
+obj-$(CONFIG_IRQ_GT641XX)	+= irq-gt641xx.o
 
 obj-$(CONFIG_32BIT)		+= scall32-o32.o
 obj-$(CONFIG_64BIT)		+= scall64-64.o
diff --git a/arch/mips/kernel/irq-gt641xx.c b/arch/mips/kernel/irq-gt641xx.c
new file mode 100644
index 00000000000..1b81b131f43
--- /dev/null
+++ b/arch/mips/kernel/irq-gt641xx.c
@@ -0,0 +1,131 @@
+/*
+ *  GT641xx IRQ routines.
+ *
+ *  Copyright (C) 2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <linux/hardirq.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#include <asm/gt64120.h>
+
+#define GT641XX_IRQ_TO_BIT(irq)	(1U << (irq - GT641XX_IRQ_BASE))
+
+static DEFINE_SPINLOCK(gt641xx_irq_lock);
+
+static void ack_gt641xx_irq(unsigned int irq)
+{
+	unsigned long flags;
+	u32 cause;
+
+	spin_lock_irqsave(&gt641xx_irq_lock, flags);
+	cause = GT_READ(GT_INTRCAUSE_OFS);
+	cause &= ~GT641XX_IRQ_TO_BIT(irq);
+	GT_WRITE(GT_INTRCAUSE_OFS, cause);
+	spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
+}
+
+static void mask_gt641xx_irq(unsigned int irq)
+{
+	unsigned long flags;
+	u32 mask;
+
+	spin_lock_irqsave(&gt641xx_irq_lock, flags);
+	mask = GT_READ(GT_INTRMASK_OFS);
+	mask &= ~GT641XX_IRQ_TO_BIT(irq);
+	GT_WRITE(GT_INTRMASK_OFS, mask);
+	spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
+}
+
+static void mask_ack_gt641xx_irq(unsigned int irq)
+{
+	unsigned long flags;
+	u32 cause, mask;
+
+	spin_lock_irqsave(&gt641xx_irq_lock, flags);
+	mask = GT_READ(GT_INTRMASK_OFS);
+	mask &= ~GT641XX_IRQ_TO_BIT(irq);
+	GT_WRITE(GT_INTRMASK_OFS, mask);
+
+	cause = GT_READ(GT_INTRCAUSE_OFS);
+	cause &= ~GT641XX_IRQ_TO_BIT(irq);
+	GT_WRITE(GT_INTRCAUSE_OFS, cause);
+	spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
+}
+
+static void unmask_gt641xx_irq(unsigned int irq)
+{
+	unsigned long flags;
+	u32 mask;
+
+	spin_lock_irqsave(&gt641xx_irq_lock, flags);
+	mask = GT_READ(GT_INTRMASK_OFS);
+	mask |= GT641XX_IRQ_TO_BIT(irq);
+	GT_WRITE(GT_INTRMASK_OFS, mask);
+	spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
+}
+
+static struct irq_chip gt641xx_irq_chip = {
+	.name		= "GT641xx",
+	.ack		= ack_gt641xx_irq,
+	.mask		= mask_gt641xx_irq,
+	.mask_ack	= mask_ack_gt641xx_irq,
+	.unmask		= unmask_gt641xx_irq,
+};
+
+void gt641xx_irq_dispatch(void)
+{
+	u32 cause, mask;
+	int i;
+
+	cause = GT_READ(GT_INTRCAUSE_OFS);
+	mask = GT_READ(GT_INTRMASK_OFS);
+	cause &= mask;
+
+	/*
+	 * bit0 : logical or of all the interrupt bits.
+	 * bit30: logical or of bits[29:26,20:1].
+	 * bit31: logical or of bits[25:1].
+	 */
+	for (i = 1; i < 30; i++) {
+		if (cause & (1U << i)) {
+			do_IRQ(GT641XX_IRQ_BASE + i);
+			return;
+		}
+	}
+
+	atomic_inc(&irq_err_count);
+}
+
+void __init gt641xx_irq_init(void)
+{
+	int i;
+
+	GT_WRITE(GT_INTRMASK_OFS, 0);
+	GT_WRITE(GT_INTRCAUSE_OFS, 0);
+
+	/*
+	 * bit0 : logical or of all the interrupt bits.
+	 * bit30: logical or of bits[29:26,20:1].
+	 * bit31: logical or of bits[25:1].
+	 */
+	for (i = 1; i < 30; i++)
+		set_irq_chip_and_handler(GT641XX_IRQ_BASE + i,
+		                         &gt641xx_irq_chip, handle_level_irq);
+}
diff --git a/arch/mips/pci/fixup-cobalt.c b/arch/mips/pci/fixup-cobalt.c
index 76b4f0ffb1e..4eb5410f842 100644
--- a/arch/mips/pci/fixup-cobalt.c
+++ b/arch/mips/pci/fixup-cobalt.c
@@ -18,6 +18,7 @@
 #include <asm/gt64120.h>
 
 #include <cobalt.h>
+#include <irq.h>
 
 static void qube_raq_galileo_early_fixup(struct pci_dev *dev)
 {
@@ -132,29 +133,29 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0,
 
 static char irq_tab_qube1[] __initdata = {
   [COBALT_PCICONF_CPU]     = 0,
-  [COBALT_PCICONF_ETH0]    = COBALT_QUBE1_ETH0_IRQ,
-  [COBALT_PCICONF_RAQSCSI] = COBALT_SCSI_IRQ,
+  [COBALT_PCICONF_ETH0]    = QUBE1_ETH0_IRQ,
+  [COBALT_PCICONF_RAQSCSI] = SCSI_IRQ,
   [COBALT_PCICONF_VIA]     = 0,
-  [COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
+  [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
   [COBALT_PCICONF_ETH1]    = 0
 };
 
 static char irq_tab_cobalt[] __initdata = {
   [COBALT_PCICONF_CPU]     = 0,
-  [COBALT_PCICONF_ETH0]    = COBALT_ETH0_IRQ,
-  [COBALT_PCICONF_RAQSCSI] = COBALT_SCSI_IRQ,
+  [COBALT_PCICONF_ETH0]    = ETH0_IRQ,
+  [COBALT_PCICONF_RAQSCSI] = SCSI_IRQ,
   [COBALT_PCICONF_VIA]     = 0,
-  [COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
-  [COBALT_PCICONF_ETH1]    = COBALT_ETH1_IRQ
+  [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
+  [COBALT_PCICONF_ETH1]    = ETH1_IRQ
 };
 
 static char irq_tab_raq2[] __initdata = {
   [COBALT_PCICONF_CPU]     = 0,
-  [COBALT_PCICONF_ETH0]    = COBALT_ETH0_IRQ,
-  [COBALT_PCICONF_RAQSCSI] = COBALT_RAQ_SCSI_IRQ,
+  [COBALT_PCICONF_ETH0]    = ETH0_IRQ,
+  [COBALT_PCICONF_RAQSCSI] = RAQ2_SCSI_IRQ,
   [COBALT_PCICONF_VIA]     = 0,
-  [COBALT_PCICONF_PCISLOT] = COBALT_QUBE_SLOT_IRQ,
-  [COBALT_PCICONF_ETH1]    = COBALT_ETH1_IRQ
+  [COBALT_PCICONF_PCISLOT] = PCISLOT_IRQ,
+  [COBALT_PCICONF_ETH1]    = ETH1_IRQ
 };
 
 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)