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9#include <linux/platform_device.h>
10#include <linux/err.h>
11#include <linux/clk.h>
12#include <linux/list.h>
13
14#include "clockdomain.h"
15#include "powerdomain.h"
16
17struct pwrdm_link {
18 struct device *dev;
19 struct powerdomain *pwrdm;
20 struct list_head node;
21};
22
23static DEFINE_SPINLOCK(iommu_lock);
24static struct clockdomain *emu_clkdm;
25static atomic_t emu_count;
26
27static void omap_iommu_dra7_emu_swsup_config(struct platform_device *pdev,
28 bool enable)
29{
30 struct device_node *np = pdev->dev.of_node;
31 unsigned long flags;
32
33 if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu"))
34 return;
35
36 if (!emu_clkdm) {
37 emu_clkdm = clkdm_lookup("emu_clkdm");
38 if (WARN_ON_ONCE(!emu_clkdm))
39 return;
40 }
41
42 spin_lock_irqsave(&iommu_lock, flags);
43
44 if (enable && (atomic_inc_return(&emu_count) == 1))
45 clkdm_deny_idle(emu_clkdm);
46 else if (!enable && (atomic_dec_return(&emu_count) == 0))
47 clkdm_allow_idle(emu_clkdm);
48
49 spin_unlock_irqrestore(&iommu_lock, flags);
50}
51
52static struct powerdomain *_get_pwrdm(struct device *dev)
53{
54 struct clk *clk;
55 struct clk_hw_omap *hwclk;
56 struct clockdomain *clkdm;
57 struct powerdomain *pwrdm = NULL;
58 struct pwrdm_link *entry;
59 unsigned long flags;
60 static LIST_HEAD(cache);
61
62 spin_lock_irqsave(&iommu_lock, flags);
63
64 list_for_each_entry(entry, &cache, node) {
65 if (entry->dev == dev) {
66 pwrdm = entry->pwrdm;
67 break;
68 }
69 }
70
71 spin_unlock_irqrestore(&iommu_lock, flags);
72
73 if (pwrdm)
74 return pwrdm;
75
76 clk = of_clk_get(dev->of_node->parent, 0);
77 if (IS_ERR(clk)) {
78 dev_err(dev, "no fck found\n");
79 return NULL;
80 }
81
82 hwclk = to_clk_hw_omap(__clk_get_hw(clk));
83 clk_put(clk);
84 if (!hwclk || !hwclk->clkdm_name) {
85 dev_err(dev, "no hwclk data\n");
86 return NULL;
87 }
88
89 clkdm = clkdm_lookup(hwclk->clkdm_name);
90 if (!clkdm) {
91 dev_err(dev, "clkdm not found: %s\n", hwclk->clkdm_name);
92 return NULL;
93 }
94
95 pwrdm = clkdm_get_pwrdm(clkdm);
96 if (!pwrdm) {
97 dev_err(dev, "pwrdm not found: %s\n", clkdm->name);
98 return NULL;
99 }
100
101 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
102 if (entry) {
103 entry->dev = dev;
104 entry->pwrdm = pwrdm;
105 spin_lock_irqsave(&iommu_lock, flags);
106 list_add(&entry->node, &cache);
107 spin_unlock_irqrestore(&iommu_lock, flags);
108 }
109
110 return pwrdm;
111}
112
113int omap_iommu_set_pwrdm_constraint(struct platform_device *pdev, bool request,
114 u8 *pwrst)
115{
116 struct powerdomain *pwrdm;
117 u8 next_pwrst;
118 int ret = 0;
119
120 pwrdm = _get_pwrdm(&pdev->dev);
121 if (!pwrdm)
122 return -ENODEV;
123
124 if (request) {
125 *pwrst = pwrdm_read_next_pwrst(pwrdm);
126 omap_iommu_dra7_emu_swsup_config(pdev, true);
127 }
128
129 if (*pwrst > PWRDM_POWER_RET)
130 goto out;
131
132 next_pwrst = request ? PWRDM_POWER_ON : *pwrst;
133
134 ret = pwrdm_set_next_pwrst(pwrdm, next_pwrst);
135
136out:
137 if (!request)
138 omap_iommu_dra7_emu_swsup_config(pdev, false);
139
140 return ret;
141}
142
