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1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
4// Author: Vignesh Raghavendra <[email protected]>
5
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/types.h>
14
15static struct hyperbus_device *map_to_hbdev(struct map_info *map)
16{
17 return container_of(map, struct hyperbus_device, map);
18}
19
20static map_word hyperbus_read16(struct map_info *map, unsigned long addr)
21{
22 struct hyperbus_device *hbdev = map_to_hbdev(map);
23 struct hyperbus_ctlr *ctlr = hbdev->ctlr;
24 map_word read_data;
25
26 read_data.x[0] = ctlr->ops->read16(hbdev, addr);
27
28 return read_data;
29}
30
31static void hyperbus_write16(struct map_info *map, map_word d,
32 unsigned long addr)
33{
34 struct hyperbus_device *hbdev = map_to_hbdev(map);
35 struct hyperbus_ctlr *ctlr = hbdev->ctlr;
36
37 ctlr->ops->write16(hbdev, addr, d.x[0]);
38}
39
40static void hyperbus_copy_from(struct map_info *map, void *to,
41 unsigned long from, ssize_t len)
42{
43 struct hyperbus_device *hbdev = map_to_hbdev(map);
44 struct hyperbus_ctlr *ctlr = hbdev->ctlr;
45
46 ctlr->ops->copy_from(hbdev, to, from, len);
47}
48
49static void hyperbus_copy_to(struct map_info *map, unsigned long to,
50 const void *from, ssize_t len)
51{
52 struct hyperbus_device *hbdev = map_to_hbdev(map);
53 struct hyperbus_ctlr *ctlr = hbdev->ctlr;
54
55 ctlr->ops->copy_to(hbdev, to, from, len);
56}
57
58int hyperbus_register_device(struct hyperbus_device *hbdev)
59{
60 const struct hyperbus_ops *ops;
61 struct hyperbus_ctlr *ctlr;
62 struct device_node *np;
63 struct map_info *map;
64 struct device *dev;
65 int ret;
66
67 if (!hbdev || !hbdev->np || !hbdev->ctlr || !hbdev->ctlr->dev) {
68 pr_err("hyperbus: please fill all the necessary fields!\n");
69 return -EINVAL;
70 }
71
72 np = hbdev->np;
73 ctlr = hbdev->ctlr;
74 if (!of_device_is_compatible(np, "cypress,hyperflash")) {
75 dev_err(ctlr->dev, "\"cypress,hyperflash\" compatible missing\n");
76 return -ENODEV;
77 }
78
79 hbdev->memtype = HYPERFLASH;
80
81 dev = ctlr->dev;
82 map = &hbdev->map;
83 map->name = dev_name(dev);
84 map->bankwidth = 2;
85 map->device_node = np;
86
87 simple_map_init(map);
88 ops = ctlr->ops;
89 if (ops) {
90 if (ops->read16)
91 map->read = hyperbus_read16;
92 if (ops->write16)
93 map->write = hyperbus_write16;
94 if (ops->copy_to)
95 map->copy_to = hyperbus_copy_to;
96 if (ops->copy_from)
97 map->copy_from = hyperbus_copy_from;
98
99 if (ops->calibrate && !ctlr->calibrated) {
100 ret = ops->calibrate(hbdev);
101 if (!ret) {
102 dev_err(dev, "Calibration failed\n");
103 return -ENODEV;
104 }
105 ctlr->calibrated = true;
106 }
107 }
108
109 hbdev->mtd = do_map_probe("cfi_probe", map);
110 if (!hbdev->mtd) {
111 dev_err(dev, "probing of hyperbus device failed\n");
112 return -ENODEV;
113 }
114
115 hbdev->mtd->dev.parent = dev;
116 mtd_set_of_node(hbdev->mtd, np);
117
118 ret = mtd_device_register(hbdev->mtd, NULL, 0);
119 if (ret) {
120 dev_err(dev, "failed to register mtd device\n");
121 map_destroy(hbdev->mtd);
122 return ret;
123 }
124
125 return 0;
126}
127EXPORT_SYMBOL_GPL(hyperbus_register_device);
128
129void hyperbus_unregister_device(struct hyperbus_device *hbdev)
130{
131 if (hbdev && hbdev->mtd) {
132 WARN_ON(mtd_device_unregister(hbdev->mtd));
133 map_destroy(hbdev->mtd);
134 }
135}
136EXPORT_SYMBOL_GPL(hyperbus_unregister_device);
137
138MODULE_DESCRIPTION("HyperBus Framework");
139MODULE_LICENSE("GPL v2");
140MODULE_AUTHOR("Vignesh Raghavendra <[email protected]>");