Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-realview/clock.c |
| 3 | * |
| 4 | * Copyright (C) 2004 ARM Limited. |
| 5 | * Written by Deep Blue Solutions Limited. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/list.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/err.h> |
Russell King | f8ce254 | 2006-01-07 16:15:52 +0000 | [diff] [blame] | 16 | #include <linux/clk.h> |
Arjan van de Ven | 0043170 | 2006-01-12 18:42:23 +0000 | [diff] [blame] | 17 | #include <linux/mutex.h> |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 18 | |
| 19 | #include <asm/semaphore.h> |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 20 | #include <asm/hardware/icst307.h> |
| 21 | |
| 22 | #include "clock.h" |
| 23 | |
| 24 | static LIST_HEAD(clocks); |
Arjan van de Ven | 0043170 | 2006-01-12 18:42:23 +0000 | [diff] [blame] | 25 | static DEFINE_MUTEX(clocks_mutex); |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 26 | |
| 27 | struct clk *clk_get(struct device *dev, const char *id) |
| 28 | { |
| 29 | struct clk *p, *clk = ERR_PTR(-ENOENT); |
| 30 | |
Arjan van de Ven | 0043170 | 2006-01-12 18:42:23 +0000 | [diff] [blame] | 31 | mutex_lock(&clocks_mutex); |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 32 | list_for_each_entry(p, &clocks, node) { |
| 33 | if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { |
| 34 | clk = p; |
| 35 | break; |
| 36 | } |
| 37 | } |
Arjan van de Ven | 0043170 | 2006-01-12 18:42:23 +0000 | [diff] [blame] | 38 | mutex_unlock(&clocks_mutex); |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 39 | |
| 40 | return clk; |
| 41 | } |
| 42 | EXPORT_SYMBOL(clk_get); |
| 43 | |
| 44 | void clk_put(struct clk *clk) |
| 45 | { |
| 46 | module_put(clk->owner); |
| 47 | } |
| 48 | EXPORT_SYMBOL(clk_put); |
| 49 | |
| 50 | int clk_enable(struct clk *clk) |
| 51 | { |
| 52 | return 0; |
| 53 | } |
| 54 | EXPORT_SYMBOL(clk_enable); |
| 55 | |
| 56 | void clk_disable(struct clk *clk) |
| 57 | { |
| 58 | } |
| 59 | EXPORT_SYMBOL(clk_disable); |
| 60 | |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 61 | unsigned long clk_get_rate(struct clk *clk) |
| 62 | { |
| 63 | return clk->rate; |
| 64 | } |
| 65 | EXPORT_SYMBOL(clk_get_rate); |
| 66 | |
| 67 | long clk_round_rate(struct clk *clk, unsigned long rate) |
| 68 | { |
| 69 | return rate; |
| 70 | } |
| 71 | EXPORT_SYMBOL(clk_round_rate); |
| 72 | |
| 73 | int clk_set_rate(struct clk *clk, unsigned long rate) |
| 74 | { |
| 75 | int ret = -EIO; |
| 76 | |
| 77 | if (clk->setvco) { |
| 78 | struct icst307_vco vco; |
| 79 | |
| 80 | vco = icst307_khz_to_vco(clk->params, rate / 1000); |
| 81 | clk->rate = icst307_khz(clk->params, vco) * 1000; |
| 82 | |
| 83 | printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n", |
| 84 | clk->name, vco.s, vco.r, vco.v); |
| 85 | |
| 86 | clk->setvco(clk, vco); |
| 87 | ret = 0; |
| 88 | } |
| 89 | return ret; |
| 90 | } |
| 91 | EXPORT_SYMBOL(clk_set_rate); |
| 92 | |
| 93 | /* |
| 94 | * These are fixed clocks. |
| 95 | */ |
| 96 | static struct clk kmi_clk = { |
| 97 | .name = "KMIREFCLK", |
| 98 | .rate = 24000000, |
| 99 | }; |
| 100 | |
| 101 | static struct clk uart_clk = { |
| 102 | .name = "UARTCLK", |
| 103 | .rate = 24000000, |
| 104 | }; |
| 105 | |
| 106 | static struct clk mmci_clk = { |
| 107 | .name = "MCLK", |
| 108 | .rate = 33000000, |
| 109 | }; |
| 110 | |
| 111 | int clk_register(struct clk *clk) |
| 112 | { |
Arjan van de Ven | 0043170 | 2006-01-12 18:42:23 +0000 | [diff] [blame] | 113 | mutex_lock(&clocks_mutex); |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 114 | list_add(&clk->node, &clocks); |
Arjan van de Ven | 0043170 | 2006-01-12 18:42:23 +0000 | [diff] [blame] | 115 | mutex_unlock(&clocks_mutex); |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 116 | return 0; |
| 117 | } |
| 118 | EXPORT_SYMBOL(clk_register); |
| 119 | |
| 120 | void clk_unregister(struct clk *clk) |
| 121 | { |
Arjan van de Ven | 0043170 | 2006-01-12 18:42:23 +0000 | [diff] [blame] | 122 | mutex_lock(&clocks_mutex); |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 123 | list_del(&clk->node); |
Arjan van de Ven | 0043170 | 2006-01-12 18:42:23 +0000 | [diff] [blame] | 124 | mutex_unlock(&clocks_mutex); |
Catalin Marinas | 8ad68bb | 2005-10-31 14:25:02 +0000 | [diff] [blame] | 125 | } |
| 126 | EXPORT_SYMBOL(clk_unregister); |
| 127 | |
| 128 | static int __init clk_init(void) |
| 129 | { |
| 130 | clk_register(&kmi_clk); |
| 131 | clk_register(&uart_clk); |
| 132 | clk_register(&mmci_clk); |
| 133 | return 0; |
| 134 | } |
| 135 | arch_initcall(clk_init); |