[MIPS] Move arch/mips/philips to arch/mips/nxp

Signed-off-by: daniel.j.laird <daniel.j.laird@nxp.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 238 insertions, 0 deletions

diff --git a/arch/mips/nxp/pnx8550/common/int.c b/arch/mips/nxp/pnx8550/common/int.c
new file mode 100644
index 0000000..aad0342
--- /dev/null
+++ b/arch/mips/nxp/pnx8550/common/int.c
@@ -0,0 +1,238 @@
+/*
+ *
+ * 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/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>
+
+/* 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,
+	.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);