aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/gt64120/common/time.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/gt64120/common/time.c')
-rw-r--r--arch/mips/gt64120/common/time.c101
1 files changed, 0 insertions, 101 deletions
diff --git a/arch/mips/gt64120/common/time.c b/arch/mips/gt64120/common/time.c
deleted file mode 100644
index c47eeb768192..000000000000
--- a/arch/mips/gt64120/common/time.c
+++ /dev/null
@@ -1,101 +0,0 @@
1/*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2 of the License, or (at your
5 * option) any later version.
6 *
7 * Galileo Technology chip interrupt handler
8 */
9#include <linux/interrupt.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/kernel_stat.h>
13#include <asm/irq_regs.h>
14#include <asm/gt64120.h>
15
16/*
17 * These are interrupt handlers for the GT on-chip interrupts. They all come
18 * in to the MIPS on a single interrupt line, and have to be handled and ack'ed
19 * differently than other MIPS interrupts.
20 */
21
22static irqreturn_t gt64120_irq(int irq, void *dev_id)
23{
24 unsigned int irq_src, int_high_src, irq_src_mask, int_high_src_mask;
25 int handled = 0;
26
27 irq_src = GT_READ(GT_INTRCAUSE_OFS);
28 irq_src_mask = GT_READ(GT_INTRMASK_OFS);
29 int_high_src = GT_READ(GT_HINTRCAUSE_OFS);
30 int_high_src_mask = GT_READ(GT_HINTRMASK_OFS);
31 irq_src = irq_src & irq_src_mask;
32 int_high_src = int_high_src & int_high_src_mask;
33
34 if (irq_src & 0x00000800) { /* Check for timer interrupt */
35 handled = 1;
36 irq_src &= ~0x00000800;
37 do_timer(1);
38#ifndef CONFIG_SMP
39 update_process_times(user_mode(get_irq_regs()));
40#endif
41 }
42
43 GT_WRITE(GT_INTRCAUSE_OFS, 0);
44 GT_WRITE(GT_HINTRCAUSE_OFS, 0);
45
46 return IRQ_HANDLED;
47}
48
49/*
50 * Initializes timer using galileo's built in timer.
51 */
52#ifdef CONFIG_SYSCLK_100
53#define Sys_clock (100 * 1000000) // 100 MHz
54#endif
55#ifdef CONFIG_SYSCLK_83
56#define Sys_clock (83.333 * 1000000) // 83.333 MHz
57#endif
58#ifdef CONFIG_SYSCLK_75
59#define Sys_clock (75 * 1000000) // 75 MHz
60#endif
61
62/*
63 * This will ignore the standard MIPS timer interrupt handler that is passed in
64 * as *irq (=irq0 in ../kernel/time.c). We will do our own timer interrupt
65 * handling.
66 */
67void __init plat_timer_setup(struct irqaction *irq)
68{
69 static struct irqaction timer;
70
71 /* Disable timer first */
72 GT_WRITE(GT_TC_CONTROL_OFS, 0);
73 /* Load timer value for 100 Hz */
74 GT_WRITE(GT_TC3_OFS, Sys_clock / HZ);
75
76 /*
77 * Create the IRQ structure entry for the timer. Since we're too early
78 * in the boot process to use the "request_irq()" call, we'll hard-code
79 * the values to the correct interrupt line.
80 */
81 timer.handler = gt64120_irq;
82 timer.flags = IRQF_SHARED | IRQF_DISABLED;
83 timer.name = "timer";
84 timer.dev_id = NULL;
85 timer.next = NULL;
86 timer.mask = CPU_MASK_NONE;
87 irq_desc[GT_TIMER].action = &timer;
88
89 enable_irq(GT_TIMER);
90
91 /* Enable timer ints */
92 GT_WRITE(GT_TC_CONTROL_OFS, 0xc0);
93 /* clear Cause register first */
94 GT_WRITE(GT_INTRCAUSE_OFS, 0x0);
95 /* Unmask timer int */
96 GT_WRITE(GT_INTRMASK_OFS, 0x800);
97 /* Clear High int register */
98 GT_WRITE(GT_HINTRCAUSE_OFS, 0x0);
99 /* Mask All interrupts at High cause interrupt */
100 GT_WRITE(GT_HINTRMASK_OFS, 0x0);
101}