This source file includes following definitions.
- map_to_hbdev
- hyperbus_read16
- hyperbus_write16
- hyperbus_copy_from
- hyperbus_copy_to
- hyperbus_register_device
- hyperbus_unregister_device
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6 #include <linux/err.h>
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/mtd/hyperbus.h>
10 #include <linux/mtd/map.h>
11 #include <linux/mtd/mtd.h>
12 #include <linux/of.h>
13 #include <linux/of_address.h>
14 #include <linux/types.h>
15
16 static struct hyperbus_device *map_to_hbdev(struct map_info *map)
17 {
18 return container_of(map, struct hyperbus_device, map);
19 }
20
21 static map_word hyperbus_read16(struct map_info *map, unsigned long addr)
22 {
23 struct hyperbus_device *hbdev = map_to_hbdev(map);
24 struct hyperbus_ctlr *ctlr = hbdev->ctlr;
25 map_word read_data;
26
27 read_data.x[0] = ctlr->ops->read16(hbdev, addr);
28
29 return read_data;
30 }
31
32 static void hyperbus_write16(struct map_info *map, map_word d,
33 unsigned long addr)
34 {
35 struct hyperbus_device *hbdev = map_to_hbdev(map);
36 struct hyperbus_ctlr *ctlr = hbdev->ctlr;
37
38 ctlr->ops->write16(hbdev, addr, d.x[0]);
39 }
40
41 static void hyperbus_copy_from(struct map_info *map, void *to,
42 unsigned long from, ssize_t len)
43 {
44 struct hyperbus_device *hbdev = map_to_hbdev(map);
45 struct hyperbus_ctlr *ctlr = hbdev->ctlr;
46
47 ctlr->ops->copy_from(hbdev, to, from, len);
48 }
49
50 static void hyperbus_copy_to(struct map_info *map, unsigned long to,
51 const void *from, ssize_t len)
52 {
53 struct hyperbus_device *hbdev = map_to_hbdev(map);
54 struct hyperbus_ctlr *ctlr = hbdev->ctlr;
55
56 ctlr->ops->copy_to(hbdev, to, from, len);
57 }
58
59 int hyperbus_register_device(struct hyperbus_device *hbdev)
60 {
61 const struct hyperbus_ops *ops;
62 struct hyperbus_ctlr *ctlr;
63 struct device_node *np;
64 struct map_info *map;
65 struct resource res;
66 struct device *dev;
67 int ret;
68
69 if (!hbdev || !hbdev->np || !hbdev->ctlr || !hbdev->ctlr->dev) {
70 pr_err("hyperbus: please fill all the necessary fields!\n");
71 return -EINVAL;
72 }
73
74 np = hbdev->np;
75 ctlr = hbdev->ctlr;
76 if (!of_device_is_compatible(np, "cypress,hyperflash"))
77 return -ENODEV;
78
79 hbdev->memtype = HYPERFLASH;
80
81 ret = of_address_to_resource(np, 0, &res);
82 if (ret)
83 return ret;
84
85 dev = ctlr->dev;
86 map = &hbdev->map;
87 map->size = resource_size(&res);
88 map->virt = devm_ioremap_resource(dev, &res);
89 if (IS_ERR(map->virt))
90 return PTR_ERR(map->virt);
91
92 map->name = dev_name(dev);
93 map->bankwidth = 2;
94 map->device_node = np;
95
96 simple_map_init(map);
97 ops = ctlr->ops;
98 if (ops) {
99 if (ops->read16)
100 map->read = hyperbus_read16;
101 if (ops->write16)
102 map->write = hyperbus_write16;
103 if (ops->copy_to)
104 map->copy_to = hyperbus_copy_to;
105 if (ops->copy_from)
106 map->copy_from = hyperbus_copy_from;
107
108 if (ops->calibrate && !ctlr->calibrated) {
109 ret = ops->calibrate(hbdev);
110 if (!ret) {
111 dev_err(dev, "Calibration failed\n");
112 return -ENODEV;
113 }
114 ctlr->calibrated = true;
115 }
116 }
117
118 hbdev->mtd = do_map_probe("cfi_probe", map);
119 if (!hbdev->mtd) {
120 dev_err(dev, "probing of hyperbus device failed\n");
121 return -ENODEV;
122 }
123
124 hbdev->mtd->dev.parent = dev;
125 mtd_set_of_node(hbdev->mtd, np);
126
127 ret = mtd_device_register(hbdev->mtd, NULL, 0);
128 if (ret) {
129 dev_err(dev, "failed to register mtd device\n");
130 map_destroy(hbdev->mtd);
131 return ret;
132 }
133
134 return 0;
135 }
136 EXPORT_SYMBOL_GPL(hyperbus_register_device);
137
138 int hyperbus_unregister_device(struct hyperbus_device *hbdev)
139 {
140 int ret = 0;
141
142 if (hbdev && hbdev->mtd) {
143 ret = mtd_device_unregister(hbdev->mtd);
144 map_destroy(hbdev->mtd);
145 }
146
147 return ret;
148 }
149 EXPORT_SYMBOL_GPL(hyperbus_unregister_device);
150
151 MODULE_DESCRIPTION("HyperBus Framework");
152 MODULE_LICENSE("GPL v2");
153 MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");