| Magnus Damm | 79714ac | 2009-07-03 10:08:05 +0000 | [diff] [blame^] | 1 | #include <linux/clk.h> |
| 2 | #include <linux/compiler.h> |
| 3 | #include <linux/slab.h> |
| 4 | #include <linux/io.h> |
| 5 | #include <linux/spinlock.h> |
| 6 | #include <asm/suspend.h> |
| 7 | #include <asm/hwblk.h> |
| 8 | #include <asm/clock.h> |
| 9 | |
| 10 | static DEFINE_SPINLOCK(hwblk_lock); |
| 11 | |
| 12 | static void hwblk_area_inc(struct hwblk_info *info, int area) |
| 13 | { |
| 14 | struct hwblk_area *hap = info->areas + area; |
| 15 | |
| 16 | hap->cnt++; |
| 17 | if (hap->cnt == 1) |
| 18 | if (hap->flags & HWBLK_AREA_FLAG_PARENT) |
| 19 | hwblk_area_inc(info, hap->parent); |
| 20 | } |
| 21 | |
| 22 | static void hwblk_area_dec(struct hwblk_info *info, int area) |
| 23 | { |
| 24 | struct hwblk_area *hap = info->areas + area; |
| 25 | |
| 26 | if (hap->cnt == 1) |
| 27 | if (hap->flags & HWBLK_AREA_FLAG_PARENT) |
| 28 | hwblk_area_dec(info, hap->parent); |
| 29 | hap->cnt--; |
| 30 | } |
| 31 | |
| 32 | static void hwblk_enable(struct hwblk_info *info, int hwblk) |
| 33 | { |
| 34 | struct hwblk *hp = info->hwblks + hwblk; |
| 35 | unsigned long tmp; |
| 36 | unsigned long flags; |
| 37 | |
| 38 | spin_lock_irqsave(&hwblk_lock, flags); |
| 39 | |
| 40 | hp->cnt++; |
| 41 | if (hp->cnt == 1) { |
| 42 | hwblk_area_inc(info, hp->area); |
| 43 | |
| 44 | tmp = __raw_readl(hp->mstp); |
| 45 | tmp &= ~(1 << hp->bit); |
| 46 | __raw_writel(tmp, hp->mstp); |
| 47 | } |
| 48 | |
| 49 | spin_unlock_irqrestore(&hwblk_lock, flags); |
| 50 | } |
| 51 | |
| 52 | static void hwblk_disable(struct hwblk_info *info, int hwblk) |
| 53 | { |
| 54 | struct hwblk *hp = info->hwblks + hwblk; |
| 55 | unsigned long tmp; |
| 56 | unsigned long flags; |
| 57 | |
| 58 | spin_lock_irqsave(&hwblk_lock, flags); |
| 59 | |
| 60 | if (hp->cnt == 1) { |
| 61 | hwblk_area_dec(info, hp->area); |
| 62 | |
| 63 | tmp = __raw_readl(hp->mstp); |
| 64 | tmp |= 1 << hp->bit; |
| 65 | __raw_writel(tmp, hp->mstp); |
| 66 | } |
| 67 | hp->cnt--; |
| 68 | |
| 69 | spin_unlock_irqrestore(&hwblk_lock, flags); |
| 70 | } |
| 71 | |
| 72 | static struct hwblk_info *hwblk_info; |
| 73 | |
| 74 | int __init hwblk_register(struct hwblk_info *info) |
| 75 | { |
| 76 | hwblk_info = info; |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | int __init __weak arch_hwblk_init(void) |
| 81 | { |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | int __weak arch_hwblk_sleep_mode(void) |
| 86 | { |
| 87 | return SUSP_SH_SLEEP; |
| 88 | } |
| 89 | |
| 90 | int __init hwblk_init(void) |
| 91 | { |
| 92 | return arch_hwblk_init(); |
| 93 | } |
| 94 | |
| 95 | /* allow clocks to enable and disable hardware blocks */ |
| 96 | static int sh_hwblk_clk_enable(struct clk *clk) |
| 97 | { |
| 98 | if (!hwblk_info) |
| 99 | return -ENOENT; |
| 100 | |
| 101 | hwblk_enable(hwblk_info, clk->arch_flags); |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static void sh_hwblk_clk_disable(struct clk *clk) |
| 106 | { |
| 107 | if (hwblk_info) |
| 108 | hwblk_disable(hwblk_info, clk->arch_flags); |
| 109 | } |
| 110 | |
| 111 | static struct clk_ops sh_hwblk_clk_ops = { |
| 112 | .enable = sh_hwblk_clk_enable, |
| 113 | .disable = sh_hwblk_clk_disable, |
| 114 | .recalc = followparent_recalc, |
| 115 | }; |
| 116 | |
| 117 | int __init sh_hwblk_clk_register(struct clk *clks, int nr) |
| 118 | { |
| 119 | struct clk *clkp; |
| 120 | int ret = 0; |
| 121 | int k; |
| 122 | |
| 123 | for (k = 0; !ret && (k < nr); k++) { |
| 124 | clkp = clks + k; |
| 125 | clkp->ops = &sh_hwblk_clk_ops; |
| 126 | ret |= clk_register(clkp); |
| 127 | } |
| 128 | |
| 129 | return ret; |
| 130 | } |