1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
// Author: Vignesh Raghavendra <vigneshr@ti.com>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/hyperbus.h>
#include <linux/mtd/mtd.h>
#include <linux/mux/consumer.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#define AM654_HBMC_CALIB_COUNT 25
struct am654_hbmc_priv {
struct hyperbus_ctlr ctlr;
struct hyperbus_device hbdev;
struct mux_control *mux_ctrl;
};
static int am654_hbmc_calibrate(struct hyperbus_device *hbdev)
{
struct map_info *map = &hbdev->map;
struct cfi_private cfi;
int count = AM654_HBMC_CALIB_COUNT;
int pass_count = 0;
int ret;
cfi.interleave = 1;
cfi.device_type = CFI_DEVICETYPE_X16;
cfi_send_gen_cmd(0xF0, 0, 0, map, &cfi, cfi.device_type, NULL);
cfi_send_gen_cmd(0x98, 0x55, 0, map, &cfi, cfi.device_type, NULL);
while (count--) {
ret = cfi_qry_present(map, 0, &cfi);
if (ret)
pass_count++;
else
pass_count = 0;
if (pass_count == 5)
break;
}
cfi_qry_mode_off(0, map, &cfi);
return ret;
}
static const struct hyperbus_ops am654_hbmc_ops = {
.calibrate = am654_hbmc_calibrate,
};
static int am654_hbmc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct am654_hbmc_priv *priv;
struct resource res;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
ret = of_address_to_resource(np, 0, &res);
if (ret)
return ret;
if (of_property_read_bool(dev->of_node, "mux-controls")) {
struct mux_control *control = devm_mux_control_get(dev, NULL);
if (IS_ERR(control))
return PTR_ERR(control);
ret = mux_control_select(control, 1);
if (ret) {
dev_err(dev, "Failed to select HBMC mux\n");
return ret;
}
priv->mux_ctrl = control;
}
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
pm_runtime_put_noidle(dev);
goto disable_pm;
}
priv->hbdev.map.size = resource_size(&res);
priv->hbdev.map.virt = devm_ioremap_resource(dev, &res);
if (IS_ERR(priv->hbdev.map.virt))
return PTR_ERR(priv->hbdev.map.virt);
priv->ctlr.dev = dev;
priv->ctlr.ops = &am654_hbmc_ops;
priv->hbdev.ctlr = &priv->ctlr;
priv->hbdev.np = of_get_next_child(dev->of_node, NULL);
ret = hyperbus_register_device(&priv->hbdev);
if (ret) {
dev_err(dev, "failed to register controller\n");
pm_runtime_put_sync(&pdev->dev);
goto disable_pm;
}
return 0;
disable_pm:
pm_runtime_disable(dev);
if (priv->mux_ctrl)
mux_control_deselect(priv->mux_ctrl);
return ret;
}
static int am654_hbmc_remove(struct platform_device *pdev)
{
struct am654_hbmc_priv *priv = platform_get_drvdata(pdev);
int ret;
ret = hyperbus_unregister_device(&priv->hbdev);
if (priv->mux_ctrl)
mux_control_deselect(priv->mux_ctrl);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return ret;
}
static const struct of_device_id am654_hbmc_dt_ids[] = {
{
.compatible = "ti,am654-hbmc",
},
{ /* end of table */ }
};
MODULE_DEVICE_TABLE(of, am654_hbmc_dt_ids);
static struct platform_driver am654_hbmc_platform_driver = {
.probe = am654_hbmc_probe,
.remove = am654_hbmc_remove,
.driver = {
.name = "hbmc-am654",
.of_match_table = am654_hbmc_dt_ids,
},
};
module_platform_driver(am654_hbmc_platform_driver);
MODULE_DESCRIPTION("HBMC driver for AM654 SoC");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:hbmc-am654");
MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
|
