Eric Miao | 49cbe78 | 2009-01-20 14:15:18 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-mmp/clock.c |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/list.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | #include <linux/clk.h> |
| 14 | #include <linux/io.h> |
| 15 | |
| 16 | #include <mach/regs-apbc.h> |
| 17 | #include "clock.h" |
| 18 | |
| 19 | static void apbc_clk_enable(struct clk *clk) |
| 20 | { |
| 21 | uint32_t clk_rst; |
| 22 | |
| 23 | clk_rst = APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(clk->fnclksel); |
| 24 | __raw_writel(clk_rst, clk->clk_rst); |
| 25 | } |
| 26 | |
| 27 | static void apbc_clk_disable(struct clk *clk) |
| 28 | { |
| 29 | __raw_writel(0, clk->clk_rst); |
| 30 | } |
| 31 | |
| 32 | struct clkops apbc_clk_ops = { |
| 33 | .enable = apbc_clk_enable, |
| 34 | .disable = apbc_clk_disable, |
| 35 | }; |
| 36 | |
Haojian Zhuang | 4092855 | 2009-09-10 14:01:22 +0800 | [diff] [blame] | 37 | static void apmu_clk_enable(struct clk *clk) |
| 38 | { |
| 39 | __raw_writel(clk->enable_val, clk->clk_rst); |
| 40 | } |
| 41 | |
| 42 | static void apmu_clk_disable(struct clk *clk) |
| 43 | { |
| 44 | __raw_writel(0, clk->clk_rst); |
| 45 | } |
| 46 | |
| 47 | struct clkops apmu_clk_ops = { |
| 48 | .enable = apmu_clk_enable, |
| 49 | .disable = apmu_clk_disable, |
| 50 | }; |
| 51 | |
Eric Miao | 49cbe78 | 2009-01-20 14:15:18 +0800 | [diff] [blame] | 52 | static DEFINE_SPINLOCK(clocks_lock); |
| 53 | |
| 54 | int clk_enable(struct clk *clk) |
| 55 | { |
| 56 | unsigned long flags; |
| 57 | |
| 58 | spin_lock_irqsave(&clocks_lock, flags); |
| 59 | if (clk->enabled++ == 0) |
| 60 | clk->ops->enable(clk); |
| 61 | spin_unlock_irqrestore(&clocks_lock, flags); |
| 62 | return 0; |
| 63 | } |
| 64 | EXPORT_SYMBOL(clk_enable); |
| 65 | |
| 66 | void clk_disable(struct clk *clk) |
| 67 | { |
| 68 | unsigned long flags; |
| 69 | |
| 70 | WARN_ON(clk->enabled == 0); |
| 71 | |
| 72 | spin_lock_irqsave(&clocks_lock, flags); |
| 73 | if (--clk->enabled == 0) |
| 74 | clk->ops->disable(clk); |
| 75 | spin_unlock_irqrestore(&clocks_lock, flags); |
| 76 | } |
| 77 | EXPORT_SYMBOL(clk_disable); |
| 78 | |
| 79 | unsigned long clk_get_rate(struct clk *clk) |
| 80 | { |
| 81 | unsigned long rate; |
| 82 | |
| 83 | if (clk->ops->getrate) |
| 84 | rate = clk->ops->getrate(clk); |
| 85 | else |
| 86 | rate = clk->rate; |
| 87 | |
| 88 | return rate; |
| 89 | } |
| 90 | EXPORT_SYMBOL(clk_get_rate); |
Haojian Zhuang | 52585cc | 2011-04-08 20:15:38 +0800 | [diff] [blame^] | 91 | |
| 92 | int clk_set_rate(struct clk *clk, unsigned long rate) |
| 93 | { |
| 94 | unsigned long flags; |
| 95 | int ret = -EINVAL; |
| 96 | |
| 97 | if (clk->ops->setrate) { |
| 98 | spin_lock_irqsave(&clocks_lock, flags); |
| 99 | ret = clk->ops->setrate(clk, rate); |
| 100 | spin_unlock_irqrestore(&clocks_lock, flags); |
| 101 | } |
| 102 | |
| 103 | return ret; |
| 104 | } |
| 105 | EXPORT_SYMBOL(clk_set_rate); |