| Paulius Zaleckas | 59d3a19 | 2009-03-26 10:06:08 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2001-2006 Storlink, Corp. |
| 3 | * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | */ |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/irq.h> |
| 12 | #include <linux/io.h> |
| 13 | #include <mach/hardware.h> |
| 14 | #include <mach/global_reg.h> |
| 15 | #include <asm/mach/time.h> |
| 16 | |
| 17 | /* |
| 18 | * Register definitions for the timers |
| 19 | */ |
| 20 | #define TIMER_COUNT(BASE_ADDR) (BASE_ADDR + 0x00) |
| 21 | #define TIMER_LOAD(BASE_ADDR) (BASE_ADDR + 0x04) |
| 22 | #define TIMER_MATCH1(BASE_ADDR) (BASE_ADDR + 0x08) |
| 23 | #define TIMER_MATCH2(BASE_ADDR) (BASE_ADDR + 0x0C) |
| 24 | #define TIMER_CR(BASE_ADDR) (BASE_ADDR + 0x30) |
| 25 | |
| 26 | #define TIMER_1_CR_ENABLE (1 << 0) |
| 27 | #define TIMER_1_CR_CLOCK (1 << 1) |
| 28 | #define TIMER_1_CR_INT (1 << 2) |
| 29 | #define TIMER_2_CR_ENABLE (1 << 3) |
| 30 | #define TIMER_2_CR_CLOCK (1 << 4) |
| 31 | #define TIMER_2_CR_INT (1 << 5) |
| 32 | #define TIMER_3_CR_ENABLE (1 << 6) |
| 33 | #define TIMER_3_CR_CLOCK (1 << 7) |
| 34 | #define TIMER_3_CR_INT (1 << 8) |
| 35 | |
| 36 | /* |
| 37 | * IRQ handler for the timer |
| 38 | */ |
| 39 | static irqreturn_t gemini_timer_interrupt(int irq, void *dev_id) |
| 40 | { |
| 41 | timer_tick(); |
| 42 | |
| 43 | return IRQ_HANDLED; |
| 44 | } |
| 45 | |
| 46 | static struct irqaction gemini_timer_irq = { |
| 47 | .name = "Gemini Timer Tick", |
| 48 | .flags = IRQF_DISABLED | IRQF_TIMER, |
| 49 | .handler = gemini_timer_interrupt, |
| 50 | }; |
| 51 | |
| 52 | /* |
| 53 | * Set up timer interrupt, and return the current time in seconds. |
| 54 | */ |
| 55 | void __init gemini_timer_init(void) |
| 56 | { |
| 57 | unsigned int tick_rate, reg_v; |
| 58 | |
| 59 | reg_v = __raw_readl(IO_ADDRESS(GEMINI_GLOBAL_BASE + GLOBAL_STATUS)); |
| 60 | tick_rate = REG_TO_AHB_SPEED(reg_v) * 1000000; |
| 61 | |
| 62 | printk(KERN_INFO "Bus: %dMHz", tick_rate / 1000000); |
| 63 | |
| 64 | tick_rate /= 6; /* APB bus run AHB*(1/6) */ |
| 65 | |
| 66 | switch(reg_v & CPU_AHB_RATIO_MASK) { |
| 67 | case CPU_AHB_1_1: |
| 68 | printk(KERN_CONT "(1/1)\n"); |
| 69 | break; |
| 70 | case CPU_AHB_3_2: |
| 71 | printk(KERN_CONT "(3/2)\n"); |
| 72 | break; |
| 73 | case CPU_AHB_24_13: |
| 74 | printk(KERN_CONT "(24/13)\n"); |
| 75 | break; |
| 76 | case CPU_AHB_2_1: |
| 77 | printk(KERN_CONT "(2/1)\n"); |
| 78 | break; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * Make irqs happen for the system timer |
| 83 | */ |
| 84 | setup_irq(IRQ_TIMER2, &gemini_timer_irq); |
| 85 | /* Start the timer */ |
| 86 | __raw_writel(tick_rate / HZ, TIMER_COUNT(IO_ADDRESS(GEMINI_TIMER2_BASE))); |
| 87 | __raw_writel(tick_rate / HZ, TIMER_LOAD(IO_ADDRESS(GEMINI_TIMER2_BASE))); |
| 88 | __raw_writel(TIMER_2_CR_ENABLE | TIMER_2_CR_INT, TIMER_CR(IO_ADDRESS(GEMINI_TIMER_BASE))); |
| 89 | } |