drm/amdgpu: add uvd enc vm functions (v2)
[muen/linux.git] / drivers / memory / samsung / exynos-srom.c
1 /*
2  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
3  *            http://www.samsung.com/
4  *
5  * EXYNOS - SROM Controller support
6  * Author: Pankaj Dubey <pankaj.dubey@samsung.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include <linux/io.h>
14 #include <linux/init.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17 #include <linux/of_platform.h>
18 #include <linux/platform_device.h>
19 #include <linux/slab.h>
20
21 #include "exynos-srom.h"
22
23 static const unsigned long exynos_srom_offsets[] = {
24         /* SROM side */
25         EXYNOS_SROM_BW,
26         EXYNOS_SROM_BC0,
27         EXYNOS_SROM_BC1,
28         EXYNOS_SROM_BC2,
29         EXYNOS_SROM_BC3,
30 };
31
32 /**
33  * struct exynos_srom_reg_dump: register dump of SROM Controller registers.
34  * @offset: srom register offset from the controller base address.
35  * @value: the value of register under the offset.
36  */
37 struct exynos_srom_reg_dump {
38         u32     offset;
39         u32     value;
40 };
41
42 /**
43  * struct exynos_srom: platform data for exynos srom controller driver.
44  * @dev: platform device pointer
45  * @reg_base: srom base address
46  * @reg_offset: exynos_srom_reg_dump pointer to hold offset and its value.
47  */
48 struct exynos_srom {
49         struct device *dev;
50         void __iomem *reg_base;
51         struct exynos_srom_reg_dump *reg_offset;
52 };
53
54 static struct exynos_srom_reg_dump *exynos_srom_alloc_reg_dump(
55                 const unsigned long *rdump,
56                 unsigned long nr_rdump)
57 {
58         struct exynos_srom_reg_dump *rd;
59         unsigned int i;
60
61         rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL);
62         if (!rd)
63                 return NULL;
64
65         for (i = 0; i < nr_rdump; ++i)
66                 rd[i].offset = rdump[i];
67
68         return rd;
69 }
70
71 static int exynos_srom_configure_bank(struct exynos_srom *srom,
72                                       struct device_node *np)
73 {
74         u32 bank, width, pmc = 0;
75         u32 timing[6];
76         u32 cs, bw;
77
78         if (of_property_read_u32(np, "reg", &bank))
79                 return -EINVAL;
80         if (of_property_read_u32(np, "reg-io-width", &width))
81                 width = 1;
82         if (of_property_read_bool(np, "samsung,srom-page-mode"))
83                 pmc = 1 << EXYNOS_SROM_BCX__PMC__SHIFT;
84         if (of_property_read_u32_array(np, "samsung,srom-timing", timing,
85                                        ARRAY_SIZE(timing)))
86                 return -EINVAL;
87
88         bank *= 4; /* Convert bank into shift/offset */
89
90         cs = 1 << EXYNOS_SROM_BW__BYTEENABLE__SHIFT;
91         if (width == 2)
92                 cs |= 1 << EXYNOS_SROM_BW__DATAWIDTH__SHIFT;
93
94         bw = readl_relaxed(srom->reg_base + EXYNOS_SROM_BW);
95         bw = (bw & ~(EXYNOS_SROM_BW__CS_MASK << bank)) | (cs << bank);
96         writel_relaxed(bw, srom->reg_base + EXYNOS_SROM_BW);
97
98         writel_relaxed(pmc | (timing[0] << EXYNOS_SROM_BCX__TACP__SHIFT) |
99                        (timing[1] << EXYNOS_SROM_BCX__TCAH__SHIFT) |
100                        (timing[2] << EXYNOS_SROM_BCX__TCOH__SHIFT) |
101                        (timing[3] << EXYNOS_SROM_BCX__TACC__SHIFT) |
102                        (timing[4] << EXYNOS_SROM_BCX__TCOS__SHIFT) |
103                        (timing[5] << EXYNOS_SROM_BCX__TACS__SHIFT),
104                        srom->reg_base + EXYNOS_SROM_BC0 + bank);
105
106         return 0;
107 }
108
109 static int exynos_srom_probe(struct platform_device *pdev)
110 {
111         struct device_node *np, *child;
112         struct exynos_srom *srom;
113         struct device *dev = &pdev->dev;
114         bool bad_bank_config = false;
115
116         np = dev->of_node;
117         if (!np) {
118                 dev_err(&pdev->dev, "could not find device info\n");
119                 return -EINVAL;
120         }
121
122         srom = devm_kzalloc(&pdev->dev,
123                         sizeof(struct exynos_srom), GFP_KERNEL);
124         if (!srom)
125                 return -ENOMEM;
126
127         srom->dev = dev;
128         srom->reg_base = of_iomap(np, 0);
129         if (!srom->reg_base) {
130                 dev_err(&pdev->dev, "iomap of exynos srom controller failed\n");
131                 return -ENOMEM;
132         }
133
134         platform_set_drvdata(pdev, srom);
135
136         srom->reg_offset = exynos_srom_alloc_reg_dump(exynos_srom_offsets,
137                         ARRAY_SIZE(exynos_srom_offsets));
138         if (!srom->reg_offset) {
139                 iounmap(srom->reg_base);
140                 return -ENOMEM;
141         }
142
143         for_each_child_of_node(np, child) {
144                 if (exynos_srom_configure_bank(srom, child)) {
145                         dev_err(dev,
146                                 "Could not decode bank configuration for %s\n",
147                                 child->name);
148                         bad_bank_config = true;
149                 }
150         }
151
152         /*
153          * If any bank failed to configure, we still provide suspend/resume,
154          * but do not probe child devices
155          */
156         if (bad_bank_config)
157                 return 0;
158
159         return of_platform_populate(np, NULL, NULL, dev);
160 }
161
162 #ifdef CONFIG_PM_SLEEP
163 static void exynos_srom_save(void __iomem *base,
164                                     struct exynos_srom_reg_dump *rd,
165                                     unsigned int num_regs)
166 {
167         for (; num_regs > 0; --num_regs, ++rd)
168                 rd->value = readl(base + rd->offset);
169 }
170
171 static void exynos_srom_restore(void __iomem *base,
172                                       const struct exynos_srom_reg_dump *rd,
173                                       unsigned int num_regs)
174 {
175         for (; num_regs > 0; --num_regs, ++rd)
176                 writel(rd->value, base + rd->offset);
177 }
178
179 static int exynos_srom_suspend(struct device *dev)
180 {
181         struct exynos_srom *srom = dev_get_drvdata(dev);
182
183         exynos_srom_save(srom->reg_base, srom->reg_offset,
184                                 ARRAY_SIZE(exynos_srom_offsets));
185         return 0;
186 }
187
188 static int exynos_srom_resume(struct device *dev)
189 {
190         struct exynos_srom *srom = dev_get_drvdata(dev);
191
192         exynos_srom_restore(srom->reg_base, srom->reg_offset,
193                                 ARRAY_SIZE(exynos_srom_offsets));
194         return 0;
195 }
196 #endif
197
198 static const struct of_device_id of_exynos_srom_ids[] = {
199         {
200                 .compatible     = "samsung,exynos4210-srom",
201         },
202         {},
203 };
204
205 static SIMPLE_DEV_PM_OPS(exynos_srom_pm_ops, exynos_srom_suspend, exynos_srom_resume);
206
207 static struct platform_driver exynos_srom_driver = {
208         .probe = exynos_srom_probe,
209         .driver = {
210                 .name = "exynos-srom",
211                 .of_match_table = of_exynos_srom_ids,
212                 .pm = &exynos_srom_pm_ops,
213                 .suppress_bind_attrs = true,
214         },
215 };
216 builtin_platform_driver(exynos_srom_driver);