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2
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4
5#include <linux/export.h>
6#include <linux/types.h>
7#include <linux/init.h>
8#include <linux/io.h>
9#include <linux/errno.h>
10#include <linux/spinlock.h>
11#include <linux/delay.h>
12#include <linux/clk.h>
13#include <video/imx-ipu-v3.h>
14
15#include "ipu-prv.h"
16
17struct ipu_smfc {
18 struct ipu_smfc_priv *priv;
19 int chno;
20 bool inuse;
21};
22
23struct ipu_smfc_priv {
24 void __iomem *base;
25 spinlock_t lock;
26 struct ipu_soc *ipu;
27 struct ipu_smfc channel[4];
28 int use_count;
29};
30
31
32#define SMFC_MAP 0x0000
33#define SMFC_WMC 0x0004
34#define SMFC_BS 0x0008
35
36int ipu_smfc_set_burstsize(struct ipu_smfc *smfc, int burstsize)
37{
38 struct ipu_smfc_priv *priv = smfc->priv;
39 unsigned long flags;
40 u32 val, shift;
41
42 spin_lock_irqsave(&priv->lock, flags);
43
44 shift = smfc->chno * 4;
45 val = readl(priv->base + SMFC_BS);
46 val &= ~(0xf << shift);
47 val |= burstsize << shift;
48 writel(val, priv->base + SMFC_BS);
49
50 spin_unlock_irqrestore(&priv->lock, flags);
51
52 return 0;
53}
54EXPORT_SYMBOL_GPL(ipu_smfc_set_burstsize);
55
56int ipu_smfc_map_channel(struct ipu_smfc *smfc, int csi_id, int mipi_id)
57{
58 struct ipu_smfc_priv *priv = smfc->priv;
59 unsigned long flags;
60 u32 val, shift;
61
62 spin_lock_irqsave(&priv->lock, flags);
63
64 shift = smfc->chno * 3;
65 val = readl(priv->base + SMFC_MAP);
66 val &= ~(0x7 << shift);
67 val |= ((csi_id << 2) | mipi_id) << shift;
68 writel(val, priv->base + SMFC_MAP);
69
70 spin_unlock_irqrestore(&priv->lock, flags);
71
72 return 0;
73}
74EXPORT_SYMBOL_GPL(ipu_smfc_map_channel);
75
76int ipu_smfc_set_watermark(struct ipu_smfc *smfc, u32 set_level, u32 clr_level)
77{
78 struct ipu_smfc_priv *priv = smfc->priv;
79 unsigned long flags;
80 u32 val, shift;
81
82 spin_lock_irqsave(&priv->lock, flags);
83
84 shift = smfc->chno * 6 + (smfc->chno > 1 ? 4 : 0);
85 val = readl(priv->base + SMFC_WMC);
86 val &= ~(0x3f << shift);
87 val |= ((clr_level << 3) | set_level) << shift;
88 writel(val, priv->base + SMFC_WMC);
89
90 spin_unlock_irqrestore(&priv->lock, flags);
91
92 return 0;
93}
94EXPORT_SYMBOL_GPL(ipu_smfc_set_watermark);
95
96int ipu_smfc_enable(struct ipu_smfc *smfc)
97{
98 struct ipu_smfc_priv *priv = smfc->priv;
99 unsigned long flags;
100
101 spin_lock_irqsave(&priv->lock, flags);
102
103 if (!priv->use_count)
104 ipu_module_enable(priv->ipu, IPU_CONF_SMFC_EN);
105
106 priv->use_count++;
107
108 spin_unlock_irqrestore(&priv->lock, flags);
109
110 return 0;
111}
112EXPORT_SYMBOL_GPL(ipu_smfc_enable);
113
114int ipu_smfc_disable(struct ipu_smfc *smfc)
115{
116 struct ipu_smfc_priv *priv = smfc->priv;
117 unsigned long flags;
118
119 spin_lock_irqsave(&priv->lock, flags);
120
121 priv->use_count--;
122
123 if (!priv->use_count)
124 ipu_module_disable(priv->ipu, IPU_CONF_SMFC_EN);
125
126 if (priv->use_count < 0)
127 priv->use_count = 0;
128
129 spin_unlock_irqrestore(&priv->lock, flags);
130
131 return 0;
132}
133EXPORT_SYMBOL_GPL(ipu_smfc_disable);
134
135struct ipu_smfc *ipu_smfc_get(struct ipu_soc *ipu, unsigned int chno)
136{
137 struct ipu_smfc_priv *priv = ipu->smfc_priv;
138 struct ipu_smfc *smfc, *ret;
139 unsigned long flags;
140
141 if (chno >= 4)
142 return ERR_PTR(-EINVAL);
143
144 smfc = &priv->channel[chno];
145 ret = smfc;
146
147 spin_lock_irqsave(&priv->lock, flags);
148
149 if (smfc->inuse) {
150 ret = ERR_PTR(-EBUSY);
151 goto unlock;
152 }
153
154 smfc->inuse = true;
155unlock:
156 spin_unlock_irqrestore(&priv->lock, flags);
157 return ret;
158}
159EXPORT_SYMBOL_GPL(ipu_smfc_get);
160
161void ipu_smfc_put(struct ipu_smfc *smfc)
162{
163 struct ipu_smfc_priv *priv = smfc->priv;
164 unsigned long flags;
165
166 spin_lock_irqsave(&priv->lock, flags);
167 smfc->inuse = false;
168 spin_unlock_irqrestore(&priv->lock, flags);
169}
170EXPORT_SYMBOL_GPL(ipu_smfc_put);
171
172int ipu_smfc_init(struct ipu_soc *ipu, struct device *dev,
173 unsigned long base)
174{
175 struct ipu_smfc_priv *priv;
176 int i;
177
178 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
179 if (!priv)
180 return -ENOMEM;
181
182 ipu->smfc_priv = priv;
183 spin_lock_init(&priv->lock);
184 priv->ipu = ipu;
185
186 priv->base = devm_ioremap(dev, base, PAGE_SIZE);
187 if (!priv->base)
188 return -ENOMEM;
189
190 for (i = 0; i < 4; i++) {
191 priv->channel[i].priv = priv;
192 priv->channel[i].chno = i;
193 }
194
195 pr_debug("%s: ioremap 0x%08lx -> %p\n", __func__, base, priv->base);
196
197 return 0;
198}
199
200void ipu_smfc_exit(struct ipu_soc *ipu)
201{
202}
203
