Commit | Line | Data |
---|---|---|
d0173278 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
e033351d WVS |
2 | /* |
3 | * intel TCO vendor specific watchdog driver support | |
4 | * | |
12d60e28 | 5 | * (c) Copyright 2006-2009 Wim Van Sebroeck <wim@iguana.be>. |
e033351d | 6 | * |
e033351d WVS |
7 | * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor |
8 | * provide warranty for any of this software. This material is | |
9 | * provided "AS-IS" and at no charge. | |
10 | */ | |
11 | ||
12 | /* | |
13 | * Includes, defines, variables, module parameters, ... | |
14 | */ | |
15 | ||
27c766aa JP |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
e033351d | 18 | /* Module and version information */ |
7944d3a5 | 19 | #define DRV_NAME "iTCO_vendor_support" |
55e8ddec | 20 | #define DRV_VERSION "1.04" |
e033351d WVS |
21 | |
22 | /* Includes */ | |
23 | #include <linux/module.h> /* For module specific items */ | |
24 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
25 | #include <linux/types.h> /* For standard types (like size_t) */ | |
26 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
27 | #include <linux/kernel.h> /* For printk/panic/... */ | |
28 | #include <linux/init.h> /* For __init/__exit/... */ | |
29 | #include <linux/ioport.h> /* For io-port access */ | |
0e6fa3fb AC |
30 | #include <linux/io.h> /* For inb/outb/... */ |
31 | ||
32 | #include "iTCO_vendor.h" | |
e033351d | 33 | |
e033351d | 34 | /* List of vendor support modes */ |
0e6fa3fb AC |
35 | /* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */ |
36 | #define SUPERMICRO_OLD_BOARD 1 | |
2c05318a | 37 | /* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems - no longer supported */ |
0e6fa3fb | 38 | #define SUPERMICRO_NEW_BOARD 2 |
55e8ddec WVS |
39 | /* Broken BIOS */ |
40 | #define BROKEN_BIOS 911 | |
e033351d | 41 | |
7ca6ee38 MW |
42 | int iTCO_vendorsupport; |
43 | EXPORT_SYMBOL(iTCO_vendorsupport); | |
44 | ||
45 | module_param_named(vendorsupport, iTCO_vendorsupport, int, 0); | |
143a2e54 | 46 | MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=" |
2c05318a | 47 | "0 (none), 1=SuperMicro Pent3, 911=Broken SMI BIOS"); |
e033351d WVS |
48 | |
49 | /* | |
50 | * Vendor Specific Support | |
51 | */ | |
52 | ||
53 | /* | |
54 | * Vendor Support: 1 | |
55 | * Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE | |
56 | * iTCO chipset: ICH2 | |
57 | * | |
58 | * Code contributed by: R. Seretny <lkpatches@paypc.com> | |
59 | * Documentation obtained by R. Seretny from SuperMicro Technical Support | |
60 | * | |
61 | * To enable Watchdog function: | |
62 | * BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes | |
63 | * This setting enables SMI to clear the watchdog expired flag. | |
64 | * If BIOS or CPU fail which may cause SMI hang, then system will | |
65 | * reboot. When application starts to use watchdog function, | |
66 | * application has to take over the control from SMI. | |
67 | * | |
68 | * For P3TSSE, J36 jumper needs to be removed to enable the Watchdog | |
69 | * function. | |
70 | * | |
71 | * Note: The system will reboot when Expire Flag is set TWICE. | |
72 | * So, if the watchdog timer is 20 seconds, then the maximum hang | |
73 | * time is about 40 seconds, and the minimum hang time is about | |
74 | * 20.6 seconds. | |
75 | */ | |
76 | ||
887c8ec7 | 77 | static void supermicro_old_pre_start(struct resource *smires) |
12d60e28 WVS |
78 | { |
79 | unsigned long val32; | |
80 | ||
81 | /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */ | |
887c8ec7 | 82 | val32 = inl(smires->start); |
12d60e28 | 83 | val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */ |
887c8ec7 | 84 | outl(val32, smires->start); /* Needed to activate watchdog */ |
12d60e28 WVS |
85 | } |
86 | ||
887c8ec7 | 87 | static void supermicro_old_pre_stop(struct resource *smires) |
12d60e28 WVS |
88 | { |
89 | unsigned long val32; | |
90 | ||
91 | /* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */ | |
887c8ec7 | 92 | val32 = inl(smires->start); |
12d60e28 | 93 | val32 |= 0x00002000; /* Turn on SMI clearing watchdog */ |
887c8ec7 | 94 | outl(val32, smires->start); /* Needed to deactivate watchdog */ |
12d60e28 WVS |
95 | } |
96 | ||
55e8ddec WVS |
97 | /* |
98 | * Vendor Support: 911 | |
99 | * Board: Some Intel ICHx based motherboards | |
100 | * iTCO chipset: ICH7+ | |
101 | * | |
102 | * Some Intel motherboards have a broken BIOS implementation: i.e. | |
103 | * the SMI handler clear's the TIMEOUT bit in the TC01_STS register | |
104 | * and does not reload the time. Thus the TCO watchdog does not reboot | |
105 | * the system. | |
106 | * | |
107 | * These are the conclusions of Andriy Gapon <avg@icyb.net.ua> after | |
108 | * debugging: the SMI handler is quite simple - it tests value in | |
109 | * TCO1_CNT against 0x800, i.e. checks TCO_TMR_HLT. If the bit is set | |
110 | * the handler goes into an infinite loop, apparently to allow the | |
111 | * second timeout and reboot. Otherwise it simply clears TIMEOUT bit | |
112 | * in TCO1_STS and that's it. | |
113 | * So the logic seems to be reversed, because it is hard to see how | |
114 | * TIMEOUT can get set to 1 and SMI generated when TCO_TMR_HLT is set | |
115 | * (other than a transitional effect). | |
116 | * | |
117 | * The only fix found to get the motherboard(s) to reboot is to put | |
118 | * the glb_smi_en bit to 0. This is a dirty hack that bypasses the | |
119 | * broken code by disabling Global SMI. | |
120 | * | |
121 | * WARNING: globally disabling SMI could possibly lead to dramatic | |
122 | * problems, especially on laptops! I.e. various ACPI things where | |
123 | * SMI is used for communication between OS and firmware. | |
124 | * | |
125 | * Don't use this fix if you don't need to!!! | |
126 | */ | |
127 | ||
887c8ec7 | 128 | static void broken_bios_start(struct resource *smires) |
55e8ddec WVS |
129 | { |
130 | unsigned long val32; | |
131 | ||
887c8ec7 | 132 | val32 = inl(smires->start); |
55e8ddec WVS |
133 | /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# |
134 | Bit 0: GBL_SMI_EN -> 0 = No SMI# will be generated by ICH. */ | |
135 | val32 &= 0xffffdffe; | |
887c8ec7 | 136 | outl(val32, smires->start); |
55e8ddec WVS |
137 | } |
138 | ||
887c8ec7 | 139 | static void broken_bios_stop(struct resource *smires) |
55e8ddec WVS |
140 | { |
141 | unsigned long val32; | |
142 | ||
887c8ec7 | 143 | val32 = inl(smires->start); |
55e8ddec WVS |
144 | /* Bit 13: TCO_EN -> 1 = Enables TCO logic generating an SMI# |
145 | Bit 0: GBL_SMI_EN -> 1 = Turn global SMI on again. */ | |
146 | val32 |= 0x00002001; | |
887c8ec7 | 147 | outl(val32, smires->start); |
55e8ddec WVS |
148 | } |
149 | ||
e033351d WVS |
150 | /* |
151 | * Generic Support Functions | |
152 | */ | |
153 | ||
887c8ec7 | 154 | void iTCO_vendor_pre_start(struct resource *smires, |
e033351d WVS |
155 | unsigned int heartbeat) |
156 | { | |
7ca6ee38 | 157 | switch (iTCO_vendorsupport) { |
55e8ddec | 158 | case SUPERMICRO_OLD_BOARD: |
887c8ec7 | 159 | supermicro_old_pre_start(smires); |
55e8ddec | 160 | break; |
55e8ddec | 161 | case BROKEN_BIOS: |
887c8ec7 | 162 | broken_bios_start(smires); |
55e8ddec WVS |
163 | break; |
164 | } | |
e033351d WVS |
165 | } |
166 | EXPORT_SYMBOL(iTCO_vendor_pre_start); | |
167 | ||
887c8ec7 | 168 | void iTCO_vendor_pre_stop(struct resource *smires) |
e033351d | 169 | { |
7ca6ee38 | 170 | switch (iTCO_vendorsupport) { |
55e8ddec | 171 | case SUPERMICRO_OLD_BOARD: |
887c8ec7 | 172 | supermicro_old_pre_stop(smires); |
55e8ddec | 173 | break; |
55e8ddec | 174 | case BROKEN_BIOS: |
887c8ec7 | 175 | broken_bios_stop(smires); |
55e8ddec WVS |
176 | break; |
177 | } | |
e033351d WVS |
178 | } |
179 | EXPORT_SYMBOL(iTCO_vendor_pre_stop); | |
180 | ||
e033351d WVS |
181 | int iTCO_vendor_check_noreboot_on(void) |
182 | { | |
7ca6ee38 | 183 | switch (iTCO_vendorsupport) { |
e033351d WVS |
184 | case SUPERMICRO_OLD_BOARD: |
185 | return 0; | |
186 | default: | |
187 | return 1; | |
188 | } | |
189 | } | |
190 | EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on); | |
191 | ||
192 | static int __init iTCO_vendor_init_module(void) | |
193 | { | |
7ca6ee38 | 194 | if (iTCO_vendorsupport == SUPERMICRO_NEW_BOARD) { |
2c05318a JD |
195 | pr_warn("Option vendorsupport=%d is no longer supported, " |
196 | "please use the w83627hf_wdt driver instead\n", | |
197 | SUPERMICRO_NEW_BOARD); | |
198 | return -EINVAL; | |
199 | } | |
7ca6ee38 | 200 | pr_info("vendor-support=%d\n", iTCO_vendorsupport); |
e033351d WVS |
201 | return 0; |
202 | } | |
203 | ||
204 | static void __exit iTCO_vendor_exit_module(void) | |
205 | { | |
27c766aa | 206 | pr_info("Module Unloaded\n"); |
e033351d WVS |
207 | } |
208 | ||
209 | module_init(iTCO_vendor_init_module); | |
210 | module_exit(iTCO_vendor_exit_module); | |
211 | ||
143a2e54 WVS |
212 | MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, " |
213 | "R. Seretny <lkpatches@paypc.com>"); | |
e033351d WVS |
214 | MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support"); |
215 | MODULE_VERSION(DRV_VERSION); | |
216 | MODULE_LICENSE("GPL"); |