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
160
161
162
163
164
|
// SPDX-License-Identifier: GPL-2.0
/*
* Intel MAX 10 Board Management Controller chip
*
* Copyright (C) 2018-2020 Intel Corporation. All rights reserved.
*/
#include <linux/bitfield.h>
#include <linux/init.h>
#include <linux/mfd/core.h>
#include <linux/mfd/intel-m10-bmc.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
enum m10bmc_type {
M10_N3000,
};
static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
{ .name = "n3000bmc-hwmon" },
{ .name = "n3000bmc-retimer" },
{ .name = "n3000bmc-secure" },
};
static struct regmap_config intel_m10bmc_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = M10BMC_MEM_END,
};
static ssize_t bmc_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct intel_m10bmc *ddata = dev_get_drvdata(dev);
unsigned int val;
int ret;
ret = m10bmc_sys_read(ddata, M10BMC_BUILD_VER, &val);
if (ret)
return ret;
return sprintf(buf, "0x%x\n", val);
}
static DEVICE_ATTR_RO(bmc_version);
static ssize_t bmcfw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct intel_m10bmc *ddata = dev_get_drvdata(dev);
unsigned int val;
int ret;
ret = m10bmc_sys_read(ddata, NIOS2_FW_VERSION, &val);
if (ret)
return ret;
return sprintf(buf, "0x%x\n", val);
}
static DEVICE_ATTR_RO(bmcfw_version);
static struct attribute *m10bmc_attrs[] = {
&dev_attr_bmc_version.attr,
&dev_attr_bmcfw_version.attr,
NULL,
};
ATTRIBUTE_GROUPS(m10bmc);
static int check_m10bmc_version(struct intel_m10bmc *ddata)
{
unsigned int v;
int ret;
/*
* This check is to filter out the very old legacy BMC versions,
* M10BMC_LEGACY_SYS_BASE is the offset to this old block of mmio
* registers. In the old BMC chips, the BMC version info is stored
* in this old version register (M10BMC_LEGACY_SYS_BASE +
* M10BMC_BUILD_VER), so its read out value would have not been
* LEGACY_INVALID (0xffffffff). But in new BMC chips that the
* driver supports, the value of this register should be
* LEGACY_INVALID.
*/
ret = m10bmc_raw_read(ddata,
M10BMC_LEGACY_SYS_BASE + M10BMC_BUILD_VER, &v);
if (ret)
return -ENODEV;
if (v != M10BMC_VER_LEGACY_INVALID) {
dev_err(ddata->dev, "bad version M10BMC detected\n");
return -ENODEV;
}
return 0;
}
static int intel_m10_bmc_spi_probe(struct spi_device *spi)
{
const struct spi_device_id *id = spi_get_device_id(spi);
struct device *dev = &spi->dev;
struct mfd_cell *cells;
struct intel_m10bmc *ddata;
int ret, n_cell;
ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
ddata->dev = dev;
ddata->regmap =
devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config);
if (IS_ERR(ddata->regmap)) {
ret = PTR_ERR(ddata->regmap);
dev_err(dev, "Failed to allocate regmap: %d\n", ret);
return ret;
}
spi_set_drvdata(spi, ddata);
ret = check_m10bmc_version(ddata);
if (ret) {
dev_err(dev, "Failed to identify m10bmc hardware\n");
return ret;
}
switch (id->driver_data) {
case M10_N3000:
cells = m10bmc_pacn3000_subdevs;
n_cell = ARRAY_SIZE(m10bmc_pacn3000_subdevs);
break;
default:
return -ENODEV;
}
ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, n_cell,
NULL, 0, NULL);
if (ret)
dev_err(dev, "Failed to register sub-devices: %d\n", ret);
return ret;
}
static const struct spi_device_id m10bmc_spi_id[] = {
{ "m10-n3000", M10_N3000 },
{ }
};
MODULE_DEVICE_TABLE(spi, m10bmc_spi_id);
static struct spi_driver intel_m10bmc_spi_driver = {
.driver = {
.name = "intel-m10-bmc",
.dev_groups = m10bmc_groups,
},
.probe = intel_m10_bmc_spi_probe,
.id_table = m10bmc_spi_id,
};
module_spi_driver(intel_m10bmc_spi_driver);
MODULE_DESCRIPTION("Intel MAX 10 BMC Device Driver");
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:intel-m10-bmc");
|
