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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// SPDX-License-Identifier: GPL-2.0
/*
* Siemens SIMATIC IPC driver for Watchdogs
*
* Copyright (c) Siemens AG, 2020-2021
*
* Authors:
* Gerd Haeussler <gerd.haeussler.ext@siemens.com>
*/
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_data/x86/simatic-ipc-base.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
#include <linux/util_macros.h>
#include <linux/watchdog.h>
#define WD_ENABLE_IOADR 0x62
#define WD_TRIGGER_IOADR 0x66
#define GPIO_COMMUNITY0_PORT_ID 0xaf
#define PAD_CFG_DW0_GPP_A_23 0x4b8
#define SAFE_EN_N_427E 0x01
#define SAFE_EN_N_227E 0x04
#define WD_ENABLED 0x01
#define WD_TRIGGERED 0x80
#define WD_MACROMODE 0x02
#define TIMEOUT_MIN 2
#define TIMEOUT_DEF 64
#define TIMEOUT_MAX 64
#define GP_STATUS_REG_227E 0x404D /* IO PORT for SAFE_EN_N on 227E */
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0000);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static struct resource gp_status_reg_227e_res =
DEFINE_RES_IO_NAMED(GP_STATUS_REG_227E, SZ_1, KBUILD_MODNAME);
static struct resource io_resource_enable =
DEFINE_RES_IO_NAMED(WD_ENABLE_IOADR, SZ_1,
KBUILD_MODNAME " WD_ENABLE_IOADR");
static struct resource io_resource_trigger =
DEFINE_RES_IO_NAMED(WD_TRIGGER_IOADR, SZ_1,
KBUILD_MODNAME " WD_TRIGGER_IOADR");
/* the actual start will be discovered with pci, 0 is a placeholder */
static struct resource mem_resource =
DEFINE_RES_MEM_NAMED(0, SZ_4, "WD_RESET_BASE_ADR");
static u32 wd_timeout_table[] = {2, 4, 6, 8, 16, 32, 48, 64 };
static void __iomem *wd_reset_base_addr;
static int wd_start(struct watchdog_device *wdd)
{
outb(inb(WD_ENABLE_IOADR) | WD_ENABLED, WD_ENABLE_IOADR);
return 0;
}
static int wd_stop(struct watchdog_device *wdd)
{
outb(inb(WD_ENABLE_IOADR) & ~WD_ENABLED, WD_ENABLE_IOADR);
return 0;
}
static int wd_ping(struct watchdog_device *wdd)
{
inb(WD_TRIGGER_IOADR);
return 0;
}
static int wd_set_timeout(struct watchdog_device *wdd, unsigned int t)
{
int timeout_idx = find_closest(t, wd_timeout_table,
ARRAY_SIZE(wd_timeout_table));
outb((inb(WD_ENABLE_IOADR) & 0xc7) | timeout_idx << 3, WD_ENABLE_IOADR);
wdd->timeout = wd_timeout_table[timeout_idx];
return 0;
}
static const struct watchdog_info wdt_ident = {
.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
WDIOF_SETTIMEOUT,
.identity = KBUILD_MODNAME,
};
static const struct watchdog_ops wdt_ops = {
.owner = THIS_MODULE,
.start = wd_start,
.stop = wd_stop,
.ping = wd_ping,
.set_timeout = wd_set_timeout,
};
static void wd_secondary_enable(u32 wdtmode)
{
u16 resetbit;
/* set safe_en_n so we are not just WDIOF_ALARMONLY */
if (wdtmode == SIMATIC_IPC_DEVICE_227E) {
/* enable SAFE_EN_N on GP_STATUS_REG_227E */
resetbit = inb(GP_STATUS_REG_227E);
outb(resetbit & ~SAFE_EN_N_227E, GP_STATUS_REG_227E);
} else {
/* enable SAFE_EN_N on PCH D1600 */
resetbit = ioread16(wd_reset_base_addr);
iowrite16(resetbit & ~SAFE_EN_N_427E, wd_reset_base_addr);
}
}
static int wd_setup(u32 wdtmode)
{
unsigned int bootstatus = 0;
int timeout_idx;
timeout_idx = find_closest(TIMEOUT_DEF, wd_timeout_table,
ARRAY_SIZE(wd_timeout_table));
if (inb(WD_ENABLE_IOADR) & WD_TRIGGERED)
bootstatus |= WDIOF_CARDRESET;
/* reset alarm bit, set macro mode, and set timeout */
outb(WD_TRIGGERED | WD_MACROMODE | timeout_idx << 3, WD_ENABLE_IOADR);
wd_secondary_enable(wdtmode);
return bootstatus;
}
static struct watchdog_device wdd_data = {
.info = &wdt_ident,
.ops = &wdt_ops,
.min_timeout = TIMEOUT_MIN,
.max_timeout = TIMEOUT_MAX
};
static int simatic_ipc_wdt_probe(struct platform_device *pdev)
{
struct simatic_ipc_platform *plat = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct resource *res;
switch (plat->devmode) {
case SIMATIC_IPC_DEVICE_227E:
if (!devm_request_region(dev, gp_status_reg_227e_res.start,
resource_size(&gp_status_reg_227e_res),
KBUILD_MODNAME)) {
dev_err(dev,
"Unable to register IO resource at %pR\n",
&gp_status_reg_227e_res);
return -EBUSY;
}
fallthrough;
case SIMATIC_IPC_DEVICE_427E:
wdd_data.parent = dev;
break;
default:
return -EINVAL;
}
if (!devm_request_region(dev, io_resource_enable.start,
resource_size(&io_resource_enable),
io_resource_enable.name)) {
dev_err(dev,
"Unable to register IO resource at %#x\n",
WD_ENABLE_IOADR);
return -EBUSY;
}
if (!devm_request_region(dev, io_resource_trigger.start,
resource_size(&io_resource_trigger),
io_resource_trigger.name)) {
dev_err(dev,
"Unable to register IO resource at %#x\n",
WD_TRIGGER_IOADR);
return -EBUSY;
}
if (plat->devmode == SIMATIC_IPC_DEVICE_427E) {
res = &mem_resource;
/* get GPIO base from PCI */
res->start = simatic_ipc_get_membase0(PCI_DEVFN(0x1f, 1));
if (res->start == 0)
return -ENODEV;
/* do the final address calculation */
res->start = res->start + (GPIO_COMMUNITY0_PORT_ID << 16) +
PAD_CFG_DW0_GPP_A_23;
res->end += res->start;
wd_reset_base_addr = devm_ioremap_resource(dev, res);
if (IS_ERR(wd_reset_base_addr))
return PTR_ERR(wd_reset_base_addr);
}
wdd_data.bootstatus = wd_setup(plat->devmode);
if (wdd_data.bootstatus)
dev_warn(dev, "last reboot caused by watchdog reset\n");
watchdog_set_nowayout(&wdd_data, nowayout);
watchdog_stop_on_reboot(&wdd_data);
return devm_watchdog_register_device(dev, &wdd_data);
}
static struct platform_driver simatic_ipc_wdt_driver = {
.probe = simatic_ipc_wdt_probe,
.driver = {
.name = KBUILD_MODNAME,
},
};
module_platform_driver(simatic_ipc_wdt_driver);
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" KBUILD_MODNAME);
MODULE_AUTHOR("Gerd Haeussler <gerd.haeussler.ext@siemens.com>");
|
