DDB5476 support from Jun Sun.

1 files changed, 252 insertions, 0 deletions

diff --git a/arch/mips/ddb5476/irq.c b/arch/mips/ddb5476/irq.c
new file mode 100644
index 000000000..bfb2118c7
--- /dev/null
+++ b/arch/mips/ddb5476/irq.c
@@ -0,0 +1,252 @@
+/*
+ *  arch/mips/ddb5476/irq.c -- NEC DDB Vrc-5476 interrupt routines
+ *
+ *  Copyright (C) 2000 Geert Uytterhoeven <geert@sonycom.com>
+ *                     Sony Software Development Center Europe (SDCE), Brussels
+ *
+ *  $Id: irq.c,v 1.1 2000/01/26 00:07:44 ralf Exp $
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/ptrace.h>
+#include <asm/nile4.h>
+
+extern void __init i8259_init(void);
+extern void i8259_disable_irq(unsigned int irq_nr);
+extern void i8259_enable_irq(unsigned int irq_nr);
+
+extern asmlinkage void ddbIRQ(void);
+extern asmlinkage void i8259_do_irq(int irq, struct pt_regs *regs);
+extern asmlinkage void do_IRQ(int irq, struct pt_regs * regs);
+
+
+void no_action(int cpl, void *dev_id, struct pt_regs *regs)
+{
+}
+
+
+#define M1543_PNP_CONFIG	0x03f0	/* PnP Config Port */
+#define M1543_PNP_INDEX		0x03f0	/* PnP Index Port */
+#define M1543_PNP_DATA		0x03f1	/* PnP Data Port */
+
+#define M1543_PNP_ALT_CONFIG	0x0370	/* Alternative PnP Config Port */
+#define M1543_PNP_ALT_INDEX	0x0370	/* Alternative PnP Index Port */
+#define M1543_PNP_ALT_DATA	0x0371	/* Alternative PnP Data Port */
+
+#define M1543_INT1_MASTER_CTRL	0x0020	/* INT_1 (master) Control Register */
+#define M1543_INT1_MASTER_MASK	0x0021	/* INT_1 (master) Mask Register */
+
+#define M1543_INT1_SLAVE_CTRL	0x00a0	/* INT_1 (slave) Control Register */
+#define M1543_INT1_SLAVE_MASK	0x00a1	/* INT_1 (slave) Mask Register */
+
+#define M1543_INT1_MASTER_ELCR	0x04d0	/* INT_1 (master) Edge/Level Control */
+#define M1543_INT1_SLAVE_ELCR	0x04d1	/* INT_1 (slave) Edge/Level Control */
+
+static struct {
+    struct resource m1543_config;
+    struct resource pic_elcr;
+} m1543_ioport = {
+    {"M1543 config",	M1543_PNP_CONFIG, M1543_PNP_CONFIG+1, IORESOURCE_BUSY},
+    {"pic ELCR",	M1543_INT1_MASTER_ELCR, M1543_INT1_MASTER_ELCR+1, 
+     IORESOURCE_BUSY}
+};
+
+static void m1543_irq_setup(void)
+{
+    /*
+     *  The ALI M1543 has 13 interrupt inputs, IRQ1..IRQ13.  Not all
+     *  the possible IO sources in the M1543 are in use by us.  We will
+     *  use the following mapping:
+     *
+     *	    IRQ1  - keyboard (default set by M1543)
+     *	    IRQ3  - reserved for UART B (default set by M1543) (note that
+     *		    the schematics for the DDB Vrc-5476 board seem to 
+     *		    indicate that IRQ3 is connected to the DS1386 
+     *		    watchdog timer interrupt output so we might have 
+     *		    a conflict)
+     *	    IRQ4  - reserved for UART A (default set by M1543)
+     *	    IRQ5  - parallel (default set by M1543)
+     *	    IRQ8  - DS1386 time of day (RTC) interrupt
+     *      IRQ9  - USB (hardwired in ddb_setup)
+     *      IRQ10 - PMU (hardwired in ddb_setup)
+     *	    IRQ12 - mouse
+     *      IRQ14,15 - IDE controller (need to be confirmed, jsun)
+     */
+ 
+    /*
+     *  Assing mouse interrupt to IRQ12 
+     */
+
+    /* Enter configuration mode */
+    outb(0x51, M1543_PNP_CONFIG);
+    outb(0x23, M1543_PNP_CONFIG);
+
+    /* Select logical device 7 (Keyboard) */
+    outb(0x07, M1543_PNP_INDEX);
+    outb(0x07, M1543_PNP_DATA);
+
+    /* Select IRQ12 */
+    outb(0x72, M1543_PNP_INDEX);
+    outb(0x0c, M1543_PNP_DATA);
+
+    /* Leave configration mode */
+    outb(0xbb, M1543_PNP_CONFIG);
+
+
+    /* Initialize the 8259 PIC in the M1543 */
+    i8259_init();
+
+    /* Enable the interrupt cascade from M1543*/
+    nile4_enable_irq(NILE4_INT_INTC);
+
+    /* request io ports */
+    if (request_resource(&ioport_resource, &m1543_ioport.m1543_config) ||
+	request_resource(&ioport_resource, &m1543_ioport.pic_elcr) ) {
+	printk("m1543_irq_setup : requesting io ports failed.\n");
+	for(;;);
+    }
+}
+
+static void nile4_irq_setup(void)
+{
+    int i;
+
+    /* Map all interrupts to CPU int #0 */
+    nile4_map_irq_all(0);
+
+    /* PCI INTA#-E# must be level triggered */
+    nile4_set_pci_irq_level_or_edge(0, 1);
+    nile4_set_pci_irq_level_or_edge(1, 1);
+    nile4_set_pci_irq_level_or_edge(2, 1);
+    nile4_set_pci_irq_level_or_edge(3, 1);
+
+    /* PCI INTA#, B#, D# must be active low, INTC# must be active high */
+    nile4_set_pci_irq_polarity(0, 0);
+    nile4_set_pci_irq_polarity(1, 0);
+    nile4_set_pci_irq_polarity(2, 1);
+    nile4_set_pci_irq_polarity(3, 0);
+
+    for (i = 0; i < 16; i++)
+	nile4_clear_irq(i);
+
+    /* Enable CPU int #0 */
+    nile4_enable_irq_output(0);
+
+    /* memory resource acquire in ddb_setup */
+}
+
+
+/*
+ * IRQ2 is cascade interrupt to second interrupt controller
+ */
+
+static struct irqaction irq2  = { no_action, 0, 0, "cascade", NULL, NULL };
+
+
+void disable_irq(unsigned int irq_nr)
+{
+    if (is_i8259_irq(irq_nr))
+	i8259_disable_irq(irq_nr);
+    else
+	nile4_disable_irq(irq_to_nile4(irq_nr));
+}
+
+void enable_irq(unsigned int irq_nr)
+{
+    if (is_i8259_irq(irq_nr))
+	i8259_enable_irq(irq_nr);
+    else
+	nile4_enable_irq(irq_to_nile4(irq_nr));
+}
+
+int table[16] = { 0, };
+
+void ddb_local0_irqdispatch(struct pt_regs *regs)
+{
+    u32 mask;
+    int nile4_irq;
+#if 0
+    volatile static int nesting = 0;
+    if (nesting++ == 0)
+	ddb5476_led_d3(1);
+    ddb5476_led_hex(nesting < 16 ? nesting : 15);
+#endif
+
+    mask = nile4_get_irq_stat(0);
+    nile4_clear_irq_mask(mask);
+
+    /* Handle the timer interrupt first */
+    if (mask & (1<<NILE4_INT_GPT)) {
+	nile4_disable_irq(NILE4_INT_GPT);
+	do_IRQ(nile4_to_irq(NILE4_INT_GPT), regs);
+	nile4_enable_irq(NILE4_INT_GPT);
+	mask &= ~(1<<NILE4_INT_GPT);
+    }
+    for (nile4_irq = 0; mask; nile4_irq++, mask >>= 1)
+	if (mask & 1) {
+	    nile4_disable_irq(nile4_irq);
+	    if (nile4_irq == NILE4_INT_INTC) {
+		int i8259_irq = nile4_i8259_iack();
+		i8259_do_irq(i8259_irq, regs);
+	    } else {
+		do_IRQ(nile4_to_irq(nile4_irq), regs);
+	    }
+	    nile4_enable_irq(nile4_irq);
+	}
+
+#if 0
+    if (--nesting == 0)
+	ddb5476_led_d3(0);
+    ddb5476_led_hex(nesting < 16 ? nesting : 15);
+#endif
+}
+
+void ddb_local1_irqdispatch(void)
+{
+    printk("ddb_local1_irqdispatch called\n");
+}
+
+void ddb_buserror_irq(void)
+{
+    printk("ddb_buserror_irq called\n");
+}
+
+void ddb_8254timer_irq(void)
+{
+    printk("ddb_8254timer_irq called\n");
+}
+
+void ddb_phantom_irq(unsigned long cause)
+{
+    printk("phantom interrupts detected : \n");
+    printk("\tcause \t\t0x%08x\n", cause);
+    printk("\tcause reg\t0x%08x\n", read_32bit_cp0_register(CP0_CAUSE));
+    printk("\tstatus reg\t0x%08x\n", read_32bit_cp0_register(CP0_STATUS));
+}
+
+void __init ddb_irq_setup(void)
+{
+#ifdef CONFIG_REMOTE_DEBUG
+    printk("Wait for gdb client connection ...\n");
+    set_debug_traps();
+    breakpoint(); /* you may move this line to whereever you want :-) */
+#endif
+    i8259_setup_irq(2, &irq2);
+
+    nile4_irq_setup();
+    m1543_irq_setup();
+
+    /* we pin #0 - #4 (no internal timer) */
+    set_cp0_status(ST0_IM, IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4);
+
+    set_except_vector(0, ddbIRQ);
+}
+