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-rw-r--r--arch/mips/pnx8550/common/int.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/arch/mips/pnx8550/common/int.c b/arch/mips/pnx8550/common/int.c
new file mode 100644
index 00000000000..cfed5051dc6
--- /dev/null
+++ b/arch/mips/pnx8550/common/int.c
@@ -0,0 +1,236 @@
+/*
+ *
+ * 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/compiler.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/random.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <int.h>
+#include <uart.h>
+
+/* 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
+};
+
+static void hw0_irqdispatch(int irq)
+{
+ /* 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);
+}
+
+
+static void timer_irqdispatch(int irq)
+{
+ irq = (0x01c0 & read_c0_config7()) >> 6;
+
+ if (unlikely(irq == 0)) {
+ printk("timer_irqdispatch: irq 0, spurious interrupt?\n");
+ return;
+ }
+
+ if (irq & 0x1)
+ do_IRQ(PNX8550_INT_TIMER1);
+ if (irq & 0x2)
+ do_IRQ(PNX8550_INT_TIMER2);
+ if (irq & 0x4)
+ do_IRQ(PNX8550_INT_TIMER3);
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+ unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
+
+ if (pending & STATUSF_IP2)
+ hw0_irqdispatch(2);
+ else if (pending & STATUSF_IP7) {
+ if (read_c0_config7() & 0x01c0)
+ timer_irqdispatch(7);
+ } else
+ spurious_interrupt();
+}
+
+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);
+ }
+}
+
+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 struct irq_chip level_irq_type = {
+ .name = "PNX Level IRQ",
+ .ack = mask_irq,
+ .mask = mask_irq,
+ .mask_ack = mask_irq,
+ .unmask = unmask_irq,
+};
+
+static struct irqaction gic_action = {
+ .handler = no_action,
+ .flags = IRQF_DISABLED,
+ .name = "GIC",
+};
+
+static struct irqaction timer_action = {
+ .handler = no_action,
+ .flags = IRQF_DISABLED | IRQF_TIMER,
+ .name = "Timer",
+};
+
+void __init arch_init_irq(void)
+{
+ int i;
+ int configPR;
+
+ for (i = 0; i < PNX8550_INT_CP0_TOTINT; i++) {
+ set_irq_chip_and_handler(i, &level_irq_type, handle_level_irq);
+ mask_irq(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.
+ */
+ 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 */
+
+ set_irq_chip_and_handler(i, &level_irq_type, handle_level_irq);
+ }
+
+ /* 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;
+
+ set_irq_chip_and_handler(MIPS_CPU_GIC_IRQ, &level_irq_type,
+ handle_level_irq);
+ setup_irq(MIPS_CPU_GIC_IRQ, &gic_action);
+
+ /* init of Timer interrupts */
+ for (i = PNX8550_INT_TIMER_MIN; i <= PNX8550_INT_TIMER_MAX; i++)
+ set_irq_chip_and_handler(i, &level_irq_type, handle_level_irq);
+
+ /* Stop Timer 1-3 */
+ configPR = read_c0_config7();
+ configPR |= 0x00000038;
+ write_c0_config7(configPR);
+
+ set_irq_chip_and_handler(MIPS_CPU_TIMER_IRQ, &level_irq_type,
+ handle_level_irq);
+ setup_irq(MIPS_CPU_TIMER_IRQ, &timer_action);
+}
+
+EXPORT_SYMBOL(pnx8550_set_gic_priority);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-30 23:50:57 +0000