1 #include <linux/clk.h>
2 #include <linux/compiler.h>
3 #include <linux/io.h>
4 #include <linux/spinlock.h>
5 #include <asm/suspend.h>
6 #include <asm/hwblk.h>
7 #include <asm/clock.h>
8
9 static DEFINE_SPINLOCK(hwblk_lock);
10
hwblk_area_mod_cnt(struct hwblk_info * info,int area,int counter,int value,int goal)11 static void hwblk_area_mod_cnt(struct hwblk_info *info,
12 int area, int counter, int value, int goal)
13 {
14 struct hwblk_area *hap = info->areas + area;
15
16 hap->cnt[counter] += value;
17
18 if (hap->cnt[counter] != goal)
19 return;
20
21 if (hap->flags & HWBLK_AREA_FLAG_PARENT)
22 hwblk_area_mod_cnt(info, hap->parent, counter, value, goal);
23 }
24
25
__hwblk_mod_cnt(struct hwblk_info * info,int hwblk,int counter,int value,int goal)26 static int __hwblk_mod_cnt(struct hwblk_info *info, int hwblk,
27 int counter, int value, int goal)
28 {
29 struct hwblk *hp = info->hwblks + hwblk;
30
31 hp->cnt[counter] += value;
32 if (hp->cnt[counter] == goal)
33 hwblk_area_mod_cnt(info, hp->area, counter, value, goal);
34
35 return hp->cnt[counter];
36 }
37
hwblk_mod_cnt(struct hwblk_info * info,int hwblk,int counter,int value,int goal)38 static void hwblk_mod_cnt(struct hwblk_info *info, int hwblk,
39 int counter, int value, int goal)
40 {
41 unsigned long flags;
42
43 spin_lock_irqsave(&hwblk_lock, flags);
44 __hwblk_mod_cnt(info, hwblk, counter, value, goal);
45 spin_unlock_irqrestore(&hwblk_lock, flags);
46 }
47
hwblk_cnt_inc(struct hwblk_info * info,int hwblk,int counter)48 void hwblk_cnt_inc(struct hwblk_info *info, int hwblk, int counter)
49 {
50 hwblk_mod_cnt(info, hwblk, counter, 1, 1);
51 }
52
hwblk_cnt_dec(struct hwblk_info * info,int hwblk,int counter)53 void hwblk_cnt_dec(struct hwblk_info *info, int hwblk, int counter)
54 {
55 hwblk_mod_cnt(info, hwblk, counter, -1, 0);
56 }
57
hwblk_enable(struct hwblk_info * info,int hwblk)58 void hwblk_enable(struct hwblk_info *info, int hwblk)
59 {
60 struct hwblk *hp = info->hwblks + hwblk;
61 unsigned long tmp;
62 unsigned long flags;
63 int ret;
64
65 spin_lock_irqsave(&hwblk_lock, flags);
66
67 ret = __hwblk_mod_cnt(info, hwblk, HWBLK_CNT_USAGE, 1, 1);
68 if (ret == 1) {
69 tmp = __raw_readl(hp->mstp);
70 tmp &= ~(1 << hp->bit);
71 __raw_writel(tmp, hp->mstp);
72 }
73
74 spin_unlock_irqrestore(&hwblk_lock, flags);
75 }
76
hwblk_disable(struct hwblk_info * info,int hwblk)77 void hwblk_disable(struct hwblk_info *info, int hwblk)
78 {
79 struct hwblk *hp = info->hwblks + hwblk;
80 unsigned long tmp;
81 unsigned long flags;
82 int ret;
83
84 spin_lock_irqsave(&hwblk_lock, flags);
85
86 ret = __hwblk_mod_cnt(info, hwblk, HWBLK_CNT_USAGE, -1, 0);
87 if (ret == 0) {
88 tmp = __raw_readl(hp->mstp);
89 tmp |= 1 << hp->bit;
90 __raw_writel(tmp, hp->mstp);
91 }
92
93 spin_unlock_irqrestore(&hwblk_lock, flags);
94 }
95
96 struct hwblk_info *hwblk_info;
97
hwblk_register(struct hwblk_info * info)98 int __init hwblk_register(struct hwblk_info *info)
99 {
100 hwblk_info = info;
101 return 0;
102 }
103
arch_hwblk_init(void)104 int __init __weak arch_hwblk_init(void)
105 {
106 return 0;
107 }
108
arch_hwblk_sleep_mode(void)109 int __weak arch_hwblk_sleep_mode(void)
110 {
111 return SUSP_SH_SLEEP;
112 }
113
hwblk_init(void)114 int __init hwblk_init(void)
115 {
116 return arch_hwblk_init();
117 }
118
119 /* allow clocks to enable and disable hardware blocks */
sh_hwblk_clk_enable(struct clk * clk)120 static int sh_hwblk_clk_enable(struct clk *clk)
121 {
122 if (!hwblk_info)
123 return -ENOENT;
124
125 hwblk_enable(hwblk_info, clk->arch_flags);
126 return 0;
127 }
128
sh_hwblk_clk_disable(struct clk * clk)129 static void sh_hwblk_clk_disable(struct clk *clk)
130 {
131 if (hwblk_info)
132 hwblk_disable(hwblk_info, clk->arch_flags);
133 }
134
135 static struct clk_ops sh_hwblk_clk_ops = {
136 .enable = sh_hwblk_clk_enable,
137 .disable = sh_hwblk_clk_disable,
138 .recalc = followparent_recalc,
139 };
140
sh_hwblk_clk_register(struct clk * clks,int nr)141 int __init sh_hwblk_clk_register(struct clk *clks, int nr)
142 {
143 struct clk *clkp;
144 int ret = 0;
145 int k;
146
147 for (k = 0; !ret && (k < nr); k++) {
148 clkp = clks + k;
149
150 /* skip over clocks using hwblk 0 (HWBLK_UNKNOWN) */
151 if (!clkp->arch_flags)
152 continue;
153
154 clkp->ops = &sh_hwblk_clk_ops;
155 ret |= clk_register(clkp);
156 }
157
158 return ret;
159 }
160