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-rw-r--r--arch/mips/philips/pnx8550/common/int.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/arch/mips/philips/pnx8550/common/int.c b/arch/mips/philips/pnx8550/common/int.c
new file mode 100644
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+++ b/arch/mips/philips/pnx8550/common/int.c
@@ -0,0 +1,293 @@
+/*
+ *
+ * Copyright (C) 2005 Embedded Alley Solutions, Inc
+ * Ported to 2.6.
+ *
+ * Per Hallsmark, per.hallsmark@mvista.com
+ * Copyright (C) 2000, 2001 MIPS Technologies, Inc.
+ * Copyright (C) 2001 Ralf Baechle
+ *
+ * Cleaned up and bug fixing: Pete Popov, ppopov@embeddedalley.com
+ *
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/random.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/gdb-stub.h>
+#include <int.h>
+#include <uart.h>
+
+extern asmlinkage void cp0_irqdispatch(void);
+
+static DEFINE_SPINLOCK(irq_lock);
+
+/* default prio for interrupts */
+/* first one is a no-no so therefore always prio 0 (disabled) */
+static char gic_prio[PNX8550_INT_GIC_TOTINT] = {
+ 0, 1, 1, 1, 1, 15, 1, 1, 1, 1, // 0 - 9
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 10 - 19
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 20 - 29
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 30 - 39
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 40 - 49
+ 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, // 50 - 59
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 60 - 69
+ 1 // 70
+};
+
+void hw0_irqdispatch(int irq, struct pt_regs *regs)
+{
+ /* find out which interrupt */
+ irq = PNX8550_GIC_VECTOR_0 >> 3;
+
+ if (irq == 0) {
+ printk("hw0_irqdispatch: irq 0, spurious interrupt?\n");
+ return;
+ }
+ do_IRQ(PNX8550_INT_GIC_MIN + irq, regs);
+}
+
+
+void timer_irqdispatch(int irq, struct pt_regs *regs)
+{
+ irq = (0x01c0 & read_c0_config7()) >> 6;
+
+ if (irq == 0) {
+ printk("timer_irqdispatch: irq 0, spurious interrupt?\n");
+ return;
+ }
+
+ if (irq & 0x1) {
+ do_IRQ(PNX8550_INT_TIMER1, regs);
+ }
+ if (irq & 0x2) {
+ do_IRQ(PNX8550_INT_TIMER2, regs);
+ }
+ if (irq & 0x4) {
+ do_IRQ(PNX8550_INT_TIMER3, regs);
+ }
+}
+
+static inline void modify_cp0_intmask(unsigned clr_mask, unsigned set_mask)
+{
+ unsigned long status = read_c0_status();
+
+ status &= ~((clr_mask & 0xFF) << 8);
+ status |= (set_mask & 0xFF) << 8;
+
+ write_c0_status(status);
+}
+
+static inline void mask_gic_int(unsigned int irq_nr)
+{
+ /* interrupt disabled, bit 26(WE_ENABLE)=1 and bit 16(enable)=0 */
+ PNX8550_GIC_REQ(irq_nr) = 1<<28; /* set priority to 0 */
+}
+
+static inline void unmask_gic_int(unsigned int irq_nr)
+{
+ /* set prio mask to lower four bits and enable interrupt */
+ PNX8550_GIC_REQ(irq_nr) = (1<<26 | 1<<16) | (1<<28) | gic_prio[irq_nr];
+}
+
+static inline void mask_irq(unsigned int irq_nr)
+{
+ if ((PNX8550_INT_CP0_MIN <= irq_nr) && (irq_nr <= PNX8550_INT_CP0_MAX)) {
+ modify_cp0_intmask(1 << irq_nr, 0);
+ } else if ((PNX8550_INT_GIC_MIN <= irq_nr) &&
+ (irq_nr <= PNX8550_INT_GIC_MAX)) {
+ mask_gic_int(irq_nr - PNX8550_INT_GIC_MIN);
+ } else if ((PNX8550_INT_TIMER_MIN <= irq_nr) &&
+ (irq_nr <= PNX8550_INT_TIMER_MAX)) {
+ modify_cp0_intmask(1 << 7, 0);
+ } else {
+ printk("mask_irq: irq %d doesn't exist!\n", irq_nr);
+ }
+}
+
+static inline void unmask_irq(unsigned int irq_nr)
+{
+ if ((PNX8550_INT_CP0_MIN <= irq_nr) && (irq_nr <= PNX8550_INT_CP0_MAX)) {
+ modify_cp0_intmask(0, 1 << irq_nr);
+ } else if ((PNX8550_INT_GIC_MIN <= irq_nr) &&
+ (irq_nr <= PNX8550_INT_GIC_MAX)) {
+ unmask_gic_int(irq_nr - PNX8550_INT_GIC_MIN);
+ } else if ((PNX8550_INT_TIMER_MIN <= irq_nr) &&
+ (irq_nr <= PNX8550_INT_TIMER_MAX)) {
+ modify_cp0_intmask(0, 1 << 7);
+ } else {
+ printk("mask_irq: irq %d doesn't exist!\n", irq_nr);
+ }
+}
+
+#define pnx8550_disable pnx8550_ack
+static void pnx8550_ack(unsigned int irq)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_lock, flags);
+ mask_irq(irq);
+ spin_unlock_irqrestore(&irq_lock, flags);
+}
+
+#define pnx8550_enable pnx8550_unmask
+static void pnx8550_unmask(unsigned int irq)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_lock, flags);
+ unmask_irq(irq);
+ spin_unlock_irqrestore(&irq_lock, flags);
+}
+
+static unsigned int startup_irq(unsigned int irq_nr)
+{
+ pnx8550_unmask(irq_nr);
+ return 0;
+}
+
+static void shutdown_irq(unsigned int irq_nr)
+{
+ pnx8550_ack(irq_nr);
+ return;
+}
+
+int pnx8550_set_gic_priority(int irq, int priority)
+{
+ int gic_irq = irq-PNX8550_INT_GIC_MIN;
+ int prev_priority = PNX8550_GIC_REQ(gic_irq) & 0xf;
+
+ gic_prio[gic_irq] = priority;
+ PNX8550_GIC_REQ(gic_irq) |= (0x10000000 | gic_prio[gic_irq]);
+
+ return prev_priority;
+}
+
+static inline void mask_and_ack_level_irq(unsigned int irq)
+{
+ pnx8550_disable(irq);
+ return;
+}
+
+static void end_irq(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) {
+ pnx8550_enable(irq);
+ }
+}
+
+static struct hw_interrupt_type level_irq_type = {
+ .typename = "PNX Level IRQ",
+ .startup = startup_irq,
+ .shutdown = shutdown_irq,
+ .enable = pnx8550_enable,
+ .disable = pnx8550_disable,
+ .ack = mask_and_ack_level_irq,
+ .end = end_irq,
+};
+
+static struct irqaction gic_action = {
+ .handler = no_action,
+ .flags = SA_INTERRUPT,
+ .name = "GIC",
+};
+
+static struct irqaction timer_action = {
+ .handler = no_action,
+ .flags = SA_INTERRUPT,
+ .name = "Timer",
+};
+
+void __init arch_init_irq(void)
+{
+ int i;
+ int configPR;
+
+ /* init of cp0 interrupts */
+ set_except_vector(0, cp0_irqdispatch);
+
+ for (i = 0; i < PNX8550_INT_CP0_TOTINT; i++) {
+ irq_desc[i].handler = &level_irq_type;
+ pnx8550_ack(i); /* mask the irq just in case */
+ }
+
+ /* init of GIC/IPC interrupts */
+ /* should be done before cp0 since cp0 init enables the GIC int */
+ for (i = PNX8550_INT_GIC_MIN; i <= PNX8550_INT_GIC_MAX; i++) {
+ int gic_int_line = i - PNX8550_INT_GIC_MIN;
+ if (gic_int_line == 0 )
+ continue; // don't fiddle with int 0
+ /*
+ * enable change of TARGET, ENABLE and ACTIVE_LOW bits
+ * set TARGET 0 to route through hw0 interrupt
+ * set ACTIVE_LOW 0 active high (correct?)
+ *
+ * We really should setup an interrupt description table
+ * to do this nicely.
+ * Note, PCI INTA is active low on the bus, but inverted
+ * in the GIC, so to us it's active high.
+ */
+#ifdef CONFIG_PNX8550_V2PCI
+ if (gic_int_line == (PNX8550_INT_GPIO0 - PNX8550_INT_GIC_MIN)) {
+ /* PCI INT through gpio 8, which is setup in
+ * pnx8550_setup.c and routed to GPIO
+ * Interrupt Level 0 (GPIO Connection 58).
+ * Set it active low. */
+
+ PNX8550_GIC_REQ(gic_int_line) = 0x1E020000;
+ } else
+#endif
+ {
+ PNX8550_GIC_REQ(i - PNX8550_INT_GIC_MIN) = 0x1E000000;
+ }
+
+ /* mask/priority is still 0 so we will not get any
+ * interrupts until it is unmasked */
+
+ irq_desc[i].handler = &level_irq_type;
+ }
+
+ /* Priority level 0 */
+ PNX8550_GIC_PRIMASK_0 = PNX8550_GIC_PRIMASK_1 = 0;
+
+ /* Set int vector table address */
+ PNX8550_GIC_VECTOR_0 = PNX8550_GIC_VECTOR_1 = 0;
+
+ irq_desc[MIPS_CPU_GIC_IRQ].handler = &level_irq_type;
+ setup_irq(MIPS_CPU_GIC_IRQ, &gic_action);
+
+ /* init of Timer interrupts */
+ for (i = PNX8550_INT_TIMER_MIN; i <= PNX8550_INT_TIMER_MAX; i++) {
+ irq_desc[i].handler = &level_irq_type;
+ }
+
+ /* Stop Timer 1-3 */
+ configPR = read_c0_config7();
+ configPR |= 0x00000038;
+ write_c0_config7(configPR);
+
+ irq_desc[MIPS_CPU_TIMER_IRQ].handler = &level_irq_type;
+ setup_irq(MIPS_CPU_TIMER_IRQ, &timer_action);
+}
+
+EXPORT_SYMBOL(pnx8550_set_gic_priority);
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