* for more details.
*
* Copyright (C) 1992 Linus Torvalds
- * Copyright (C) 1994 - 2001, 2003 Ralf Baechle
+ * Copyright (C) 1994 - 2001, 2003, 07 Ralf Baechle
*/
+#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
+#include <asm/irq_cpu.h>
+#include <asm/i8253.h>
#include <asm/i8259.h>
#include <asm/io.h>
#include <asm/jazz.h>
+#include <asm/pgtable.h>
static DEFINE_SPINLOCK(r4030_lock);
static void enable_r4030_irq(unsigned int irq)
{
- unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ);
+ unsigned int mask = 1 << (irq - JAZZ_IRQ_START);
unsigned long flags;
spin_lock_irqsave(&r4030_lock, flags);
void disable_r4030_irq(unsigned int irq)
{
- unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ));
+ unsigned int mask = ~(1 << (irq - JAZZ_IRQ_START));
unsigned long flags;
spin_lock_irqsave(&r4030_lock, flags);
{
int i;
- for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++)
+ for (i = JAZZ_IRQ_START; i <= JAZZ_IRQ_END; i++)
set_irq_chip_and_handler(i, &r4030_irq_type, handle_level_irq);
r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
*/
void __init arch_init_irq(void)
{
+ /*
+ * this is a hack to get back the still needed wired mapping
+ * killed by init_mm()
+ */
+
+ /* Map 0xe0000000 -> 0x0:800005C0, 0xe0010000 -> 0x1:30000580 */
+ add_wired_entry(0x02000017, 0x03c00017, 0xe0000000, PM_64K);
+ /* Map 0xe2000000 -> 0x0:900005C0, 0xe3010000 -> 0x0:910005C0 */
+ add_wired_entry(0x02400017, 0x02440017, 0xe2000000, PM_16M);
+ /* Map 0xe4000000 -> 0x0:600005C0, 0xe4100000 -> 400005C0 */
+ add_wired_entry(0x01800017, 0x01000017, 0xe4000000, PM_4M);
+
init_i8259_irqs(); /* Integrated i8259 */
+ mips_cpu_irq_init();
init_r4030_ints();
- change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1);
-}
-
-static void loc_call(unsigned int irq, unsigned int mask)
-{
- r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
- r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) & mask);
- do_IRQ(irq);
- r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
- r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) | mask);
-}
-
-static void ll_local_dev(void)
-{
- switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE)) {
- case 0:
- panic("Unimplemented loc_no_irq handler");
- break;
- case 4:
- loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_PARALLEL);
- break;
- case 8:
- loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_FLOPPY);
- break;
- case 12:
- panic("Unimplemented loc_sound handler");
- break;
- case 16:
- panic("Unimplemented loc_video handler");
- break;
- case 20:
- loc_call(JAZZ_ETHERNET_IRQ, JAZZ_IE_ETHERNET);
- break;
- case 24:
- loc_call(JAZZ_SCSI_IRQ, JAZZ_IE_SCSI);
- break;
- case 28:
- loc_call(JAZZ_KEYBOARD_IRQ, JAZZ_IE_KEYBOARD);
- break;
- case 32:
- loc_call(JAZZ_MOUSE_IRQ, JAZZ_IE_MOUSE);
- break;
- case 36:
- loc_call(JAZZ_SERIAL1_IRQ, JAZZ_IE_SERIAL1);
- break;
- case 40:
- loc_call(JAZZ_SERIAL2_IRQ, JAZZ_IE_SERIAL2);
- break;
- }
+ change_c0_status(ST0_IM, IE_IRQ2 | IE_IRQ1);
}
asmlinkage void plat_irq_dispatch(void)
{
- unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+ unsigned int pending = read_c0_cause() & read_c0_status();
+ unsigned int irq;
- if (pending & IE_IRQ5)
- write_c0_compare(0);
- else if (pending & IE_IRQ4) {
+ if (pending & IE_IRQ4) {
r4030_read_reg32(JAZZ_TIMER_REGISTER);
do_IRQ(JAZZ_TIMER_IRQ);
- } else if (pending & IE_IRQ3)
- panic("Unimplemented ISA NMI handler");
- else if (pending & IE_IRQ2)
+ } else if (pending & IE_IRQ2)
do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK));
else if (pending & IE_IRQ1) {
- ll_local_dev();
- } else if (unlikely(pending & IE_IRQ0))
- panic("Unimplemented local_dma handler");
- else if (pending & IE_SW1) {
- clear_c0_cause(IE_SW1);
- panic("Unimplemented sw1 handler");
- } else if (pending & IE_SW0) {
- clear_c0_cause(IE_SW0);
- panic("Unimplemented sw0 handler");
+ irq = *(volatile u8 *)JAZZ_IO_IRQ_SOURCE >> 2;
+ if (likely(irq > 0))
+ do_IRQ(irq + JAZZ_IRQ_START - 1);
+ else
+ panic("Unimplemented loc_no_irq handler");
}
}
+
+static void r4030_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ /* Nothing to do ... */
+}
+
+struct clock_event_device r4030_clockevent = {
+ .name = "r4030",
+ .features = CLOCK_EVT_FEAT_PERIODIC,
+ .rating = 100,
+ .irq = JAZZ_TIMER_IRQ,
+ .cpumask = CPU_MASK_CPU0,
+ .set_mode = r4030_set_mode,
+};
+
+static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id)
+{
+ r4030_clockevent.event_handler(&r4030_clockevent);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction r4030_timer_irqaction = {
+ .handler = r4030_timer_interrupt,
+ .flags = IRQF_DISABLED,
+ .mask = CPU_MASK_CPU0,
+ .name = "timer",
+};
+
+void __init plat_time_init(void)
+{
+ struct irqaction *irq = &r4030_timer_irqaction;
+
+ BUG_ON(HZ != 100);
+
+ /*
+ * Set clock to 100Hz.
+ *
+ * The R4030 timer receives an input clock of 1kHz which is divieded by
+ * a programmable 4-bit divider. This makes it fairly inflexible.
+ */
+ r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9);
+ setup_irq(JAZZ_TIMER_IRQ, irq);
+
+ clockevents_register_device(&r4030_clockevent);
+ setup_pit_timer();
+}
git.openpandora.org / pandora-kernel.git / blobdiff