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Commit | Line | Data |
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4c076fb4 DD |
1 | /* |
2 | * Octeon Watchdog driver | |
3 | * | |
381cec02 | 4 | * Copyright (C) 2007-2017 Cavium, Inc. |
4c076fb4 | 5 | * |
3d588c93 AK |
6 | * Converted to use WATCHDOG_CORE by Aaro Koskinen <aaro.koskinen@iki.fi>. |
7 | * | |
4c076fb4 DD |
8 | * Some parts derived from wdt.c |
9 | * | |
10 | * (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>, | |
11 | * All Rights Reserved. | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public License | |
15 | * as published by the Free Software Foundation; either version | |
16 | * 2 of the License, or (at your option) any later version. | |
17 | * | |
18 | * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide | |
19 | * warranty for any of this software. This material is provided | |
20 | * "AS-IS" and at no charge. | |
21 | * | |
22 | * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> | |
23 | * | |
24 | * This file is subject to the terms and conditions of the GNU General Public | |
25 | * License. See the file "COPYING" in the main directory of this archive | |
26 | * for more details. | |
27 | * | |
28 | * | |
29 | * The OCTEON watchdog has a maximum timeout of 2^32 * io_clock. | |
30 | * For most systems this is less than 10 seconds, so to allow for | |
31 | * software to request longer watchdog heartbeats, we maintain software | |
32 | * counters to count multiples of the base rate. If the system locks | |
33 | * up in such a manner that we can not run the software counters, the | |
34 | * only result is a watchdog reset sooner than was requested. But | |
35 | * that is OK, because in this case userspace would likely not be able | |
36 | * to do anything anyhow. | |
37 | * | |
38 | * The hardware watchdog interval we call the period. The OCTEON | |
39 | * watchdog goes through several stages, after the first period an | |
40 | * irq is asserted, then if it is not reset, after the next period NMI | |
41 | * is asserted, then after an additional period a chip wide soft reset. | |
42 | * So for the software counters, we reset watchdog after each period | |
43 | * and decrement the counter. But for the last two periods we need to | |
44 | * let the watchdog progress to the NMI stage so we disable the irq | |
45 | * and let it proceed. Once in the NMI, we print the register state | |
46 | * to the serial port and then wait for the reset. | |
47 | * | |
48 | * A watchdog is maintained for each CPU in the system, that way if | |
49 | * one CPU suffers a lockup, we also get a register dump and reset. | |
50 | * The userspace ping resets the watchdog on all CPUs. | |
51 | * | |
52 | * Before userspace opens the watchdog device, we still run the | |
53 | * watchdogs to catch any lockups that may be kernel related. | |
54 | * | |
55 | */ | |
56 | ||
27c766aa JP |
57 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
58 | ||
4c076fb4 DD |
59 | #include <linux/interrupt.h> |
60 | #include <linux/watchdog.h> | |
61 | #include <linux/cpumask.h> | |
4c076fb4 | 62 | #include <linux/module.h> |
4c076fb4 DD |
63 | #include <linux/delay.h> |
64 | #include <linux/cpu.h> | |
ca4d3e67 | 65 | #include <linux/irq.h> |
4c076fb4 DD |
66 | |
67 | #include <asm/mipsregs.h> | |
68 | #include <asm/uasm.h> | |
69 | ||
70 | #include <asm/octeon/octeon.h> | |
49d148b4 | 71 | #include <asm/octeon/cvmx-boot-vector.h> |
0cd4e7a9 | 72 | #include <asm/octeon/cvmx-ciu2-defs.h> |
1d1821b2 CM |
73 | #include <asm/octeon/cvmx-rst-defs.h> |
74 | ||
75 | /* Watchdog interrupt major block number (8 MSBs of intsn) */ | |
76 | #define WD_BLOCK_NUMBER 0x01 | |
0cd4e7a9 DD |
77 | |
78 | static int divisor; | |
4c076fb4 DD |
79 | |
80 | /* The count needed to achieve timeout_sec. */ | |
81 | static unsigned int timeout_cnt; | |
82 | ||
83 | /* The maximum period supported. */ | |
84 | static unsigned int max_timeout_sec; | |
85 | ||
86 | /* The current period. */ | |
87 | static unsigned int timeout_sec; | |
88 | ||
89 | /* Set to non-zero when userspace countdown mode active */ | |
381cec02 | 90 | static bool do_countdown; |
4c076fb4 DD |
91 | static unsigned int countdown_reset; |
92 | static unsigned int per_cpu_countdown[NR_CPUS]; | |
93 | ||
94 | static cpumask_t irq_enabled_cpus; | |
95 | ||
96 | #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ | |
97 | ||
1d1821b2 CM |
98 | #define CVMX_GSERX_SCRATCH(offset) (CVMX_ADD_IO_SEG(0x0001180090000020ull) + ((offset) & 15) * 0x1000000ull) |
99 | ||
4c076fb4 | 100 | static int heartbeat = WD_TIMO; |
381cec02 | 101 | module_param(heartbeat, int, 0444); |
4c076fb4 DD |
102 | MODULE_PARM_DESC(heartbeat, |
103 | "Watchdog heartbeat in seconds. (0 < heartbeat, default=" | |
104 | __MODULE_STRING(WD_TIMO) ")"); | |
105 | ||
86a1e189 | 106 | static bool nowayout = WATCHDOG_NOWAYOUT; |
381cec02 | 107 | module_param(nowayout, bool, 0444); |
4c076fb4 DD |
108 | MODULE_PARM_DESC(nowayout, |
109 | "Watchdog cannot be stopped once started (default=" | |
110 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
111 | ||
381cec02 SH |
112 | static int disable; |
113 | module_param(disable, int, 0444); | |
114 | MODULE_PARM_DESC(disable, | |
115 | "Disable the watchdog entirely (default=0)"); | |
116 | ||
49d148b4 | 117 | static struct cvmx_boot_vector_element *octeon_wdt_bootvector; |
4c076fb4 DD |
118 | |
119 | void octeon_wdt_nmi_stage2(void); | |
120 | ||
4c076fb4 DD |
121 | static int cpu2core(int cpu) |
122 | { | |
123 | #ifdef CONFIG_SMP | |
1d1821b2 | 124 | return cpu_logical_map(cpu) & 0x3f; |
4c076fb4 DD |
125 | #else |
126 | return cvmx_get_core_num(); | |
127 | #endif | |
128 | } | |
129 | ||
4c076fb4 DD |
130 | /** |
131 | * Poke the watchdog when an interrupt is received | |
132 | * | |
133 | * @cpl: | |
134 | * @dev_id: | |
135 | * | |
136 | * Returns | |
137 | */ | |
138 | static irqreturn_t octeon_wdt_poke_irq(int cpl, void *dev_id) | |
139 | { | |
1d1821b2 CM |
140 | int cpu = raw_smp_processor_id(); |
141 | unsigned int core = cpu2core(cpu); | |
142 | int node = cpu_to_node(cpu); | |
4c076fb4 | 143 | |
381cec02 | 144 | if (do_countdown) { |
4c076fb4 DD |
145 | if (per_cpu_countdown[cpu] > 0) { |
146 | /* We're alive, poke the watchdog */ | |
1d1821b2 | 147 | cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(core), 1); |
4c076fb4 DD |
148 | per_cpu_countdown[cpu]--; |
149 | } else { | |
150 | /* Bad news, you are about to reboot. */ | |
151 | disable_irq_nosync(cpl); | |
152 | cpumask_clear_cpu(cpu, &irq_enabled_cpus); | |
153 | } | |
154 | } else { | |
155 | /* Not open, just ping away... */ | |
1d1821b2 | 156 | cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(core), 1); |
4c076fb4 DD |
157 | } |
158 | return IRQ_HANDLED; | |
159 | } | |
160 | ||
161 | /* From setup.c */ | |
162 | extern int prom_putchar(char c); | |
163 | ||
164 | /** | |
165 | * Write a string to the uart | |
166 | * | |
167 | * @str: String to write | |
168 | */ | |
169 | static void octeon_wdt_write_string(const char *str) | |
170 | { | |
171 | /* Just loop writing one byte at a time */ | |
172 | while (*str) | |
173 | prom_putchar(*str++); | |
174 | } | |
175 | ||
176 | /** | |
177 | * Write a hex number out of the uart | |
178 | * | |
179 | * @value: Number to display | |
180 | * @digits: Number of digits to print (1 to 16) | |
181 | */ | |
182 | static void octeon_wdt_write_hex(u64 value, int digits) | |
183 | { | |
184 | int d; | |
185 | int v; | |
8692cf0a | 186 | |
4c076fb4 DD |
187 | for (d = 0; d < digits; d++) { |
188 | v = (value >> ((digits - d - 1) * 4)) & 0xf; | |
189 | if (v >= 10) | |
190 | prom_putchar('a' + v - 10); | |
191 | else | |
192 | prom_putchar('0' + v); | |
193 | } | |
194 | } | |
195 | ||
3a30c07e | 196 | static const char reg_name[][3] = { |
4c076fb4 DD |
197 | "$0", "at", "v0", "v1", "a0", "a1", "a2", "a3", |
198 | "a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3", | |
199 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", | |
200 | "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra" | |
201 | }; | |
202 | ||
203 | /** | |
204 | * NMI stage 3 handler. NMIs are handled in the following manner: | |
205 | * 1) The first NMI handler enables CVMSEG and transfers from | |
206 | * the bootbus region into normal memory. It is careful to not | |
207 | * destroy any registers. | |
208 | * 2) The second stage handler uses CVMSEG to save the registers | |
209 | * and create a stack for C code. It then calls the third level | |
210 | * handler with one argument, a pointer to the register values. | |
211 | * 3) The third, and final, level handler is the following C | |
212 | * function that prints out some useful infomration. | |
213 | * | |
214 | * @reg: Pointer to register state before the NMI | |
215 | */ | |
216 | void octeon_wdt_nmi_stage3(u64 reg[32]) | |
217 | { | |
218 | u64 i; | |
219 | ||
220 | unsigned int coreid = cvmx_get_core_num(); | |
221 | /* | |
222 | * Save status and cause early to get them before any changes | |
223 | * might happen. | |
224 | */ | |
225 | u64 cp0_cause = read_c0_cause(); | |
226 | u64 cp0_status = read_c0_status(); | |
227 | u64 cp0_error_epc = read_c0_errorepc(); | |
228 | u64 cp0_epc = read_c0_epc(); | |
229 | ||
230 | /* Delay so output from all cores output is not jumbled together. */ | |
0cd4e7a9 | 231 | udelay(85000 * coreid); |
4c076fb4 DD |
232 | |
233 | octeon_wdt_write_string("\r\n*** NMI Watchdog interrupt on Core 0x"); | |
0cd4e7a9 | 234 | octeon_wdt_write_hex(coreid, 2); |
4c076fb4 DD |
235 | octeon_wdt_write_string(" ***\r\n"); |
236 | for (i = 0; i < 32; i++) { | |
237 | octeon_wdt_write_string("\t"); | |
238 | octeon_wdt_write_string(reg_name[i]); | |
239 | octeon_wdt_write_string("\t0x"); | |
240 | octeon_wdt_write_hex(reg[i], 16); | |
241 | if (i & 1) | |
242 | octeon_wdt_write_string("\r\n"); | |
243 | } | |
244 | octeon_wdt_write_string("\terr_epc\t0x"); | |
245 | octeon_wdt_write_hex(cp0_error_epc, 16); | |
246 | ||
247 | octeon_wdt_write_string("\tepc\t0x"); | |
248 | octeon_wdt_write_hex(cp0_epc, 16); | |
249 | octeon_wdt_write_string("\r\n"); | |
250 | ||
251 | octeon_wdt_write_string("\tstatus\t0x"); | |
252 | octeon_wdt_write_hex(cp0_status, 16); | |
253 | octeon_wdt_write_string("\tcause\t0x"); | |
254 | octeon_wdt_write_hex(cp0_cause, 16); | |
255 | octeon_wdt_write_string("\r\n"); | |
256 | ||
0cd4e7a9 DD |
257 | /* The CIU register is different for each Octeon model. */ |
258 | if (OCTEON_IS_MODEL(OCTEON_CN68XX)) { | |
259 | octeon_wdt_write_string("\tsrc_wd\t0x"); | |
260 | octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_SRC_PPX_IP2_WDOG(coreid)), 16); | |
261 | octeon_wdt_write_string("\ten_wd\t0x"); | |
262 | octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_EN_PPX_IP2_WDOG(coreid)), 16); | |
263 | octeon_wdt_write_string("\r\n"); | |
264 | octeon_wdt_write_string("\tsrc_rml\t0x"); | |
265 | octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_SRC_PPX_IP2_RML(coreid)), 16); | |
266 | octeon_wdt_write_string("\ten_rml\t0x"); | |
267 | octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_EN_PPX_IP2_RML(coreid)), 16); | |
268 | octeon_wdt_write_string("\r\n"); | |
269 | octeon_wdt_write_string("\tsum\t0x"); | |
270 | octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU2_SUM_PPX_IP2(coreid)), 16); | |
271 | octeon_wdt_write_string("\r\n"); | |
272 | } else if (!octeon_has_feature(OCTEON_FEATURE_CIU3)) { | |
273 | octeon_wdt_write_string("\tsum0\t0x"); | |
274 | octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU_INTX_SUM0(coreid * 2)), 16); | |
275 | octeon_wdt_write_string("\ten0\t0x"); | |
276 | octeon_wdt_write_hex(cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)), 16); | |
277 | octeon_wdt_write_string("\r\n"); | |
278 | } | |
4c076fb4 DD |
279 | |
280 | octeon_wdt_write_string("*** Chip soft reset soon ***\r\n"); | |
1d1821b2 CM |
281 | |
282 | /* | |
283 | * G-30204: We must trigger a soft reset before watchdog | |
284 | * does an incomplete job of doing it. | |
285 | */ | |
286 | if (OCTEON_IS_OCTEON3() && !OCTEON_IS_MODEL(OCTEON_CN70XX)) { | |
287 | u64 scr; | |
288 | unsigned int node = cvmx_get_node_num(); | |
289 | unsigned int lcore = cvmx_get_local_core_num(); | |
290 | union cvmx_ciu_wdogx ciu_wdog; | |
291 | ||
292 | /* | |
293 | * Wait for other cores to print out information, but | |
294 | * not too long. Do the soft reset before watchdog | |
295 | * can trigger it. | |
296 | */ | |
297 | do { | |
298 | ciu_wdog.u64 = cvmx_read_csr_node(node, CVMX_CIU_WDOGX(lcore)); | |
299 | } while (ciu_wdog.s.cnt > 0x10000); | |
300 | ||
301 | scr = cvmx_read_csr_node(0, CVMX_GSERX_SCRATCH(0)); | |
302 | scr |= 1 << 11; /* Indicate watchdog in bit 11 */ | |
303 | cvmx_write_csr_node(0, CVMX_GSERX_SCRATCH(0), scr); | |
304 | cvmx_write_csr_node(0, CVMX_RST_SOFT_RST, 1); | |
305 | } | |
306 | } | |
307 | ||
308 | static int octeon_wdt_cpu_to_irq(int cpu) | |
309 | { | |
310 | unsigned int coreid; | |
311 | int node; | |
312 | int irq; | |
313 | ||
314 | coreid = cpu2core(cpu); | |
315 | node = cpu_to_node(cpu); | |
316 | ||
317 | if (octeon_has_feature(OCTEON_FEATURE_CIU3)) { | |
318 | struct irq_domain *domain; | |
319 | int hwirq; | |
320 | ||
321 | domain = octeon_irq_get_block_domain(node, | |
322 | WD_BLOCK_NUMBER); | |
323 | hwirq = WD_BLOCK_NUMBER << 12 | 0x200 | coreid; | |
324 | irq = irq_find_mapping(domain, hwirq); | |
325 | } else { | |
326 | irq = OCTEON_IRQ_WDOG0 + coreid; | |
327 | } | |
328 | return irq; | |
4c076fb4 DD |
329 | } |
330 | ||
948b9c60 | 331 | static int octeon_wdt_cpu_pre_down(unsigned int cpu) |
4c076fb4 DD |
332 | { |
333 | unsigned int core; | |
1d1821b2 | 334 | int node; |
4c076fb4 DD |
335 | union cvmx_ciu_wdogx ciu_wdog; |
336 | ||
337 | core = cpu2core(cpu); | |
338 | ||
1d1821b2 | 339 | node = cpu_to_node(cpu); |
4c076fb4 DD |
340 | |
341 | /* Poke the watchdog to clear out its state */ | |
1d1821b2 | 342 | cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(core), 1); |
4c076fb4 DD |
343 | |
344 | /* Disable the hardware. */ | |
345 | ciu_wdog.u64 = 0; | |
1d1821b2 | 346 | cvmx_write_csr_node(node, CVMX_CIU_WDOGX(core), ciu_wdog.u64); |
4c076fb4 | 347 | |
1d1821b2 | 348 | free_irq(octeon_wdt_cpu_to_irq(cpu), octeon_wdt_poke_irq); |
948b9c60 | 349 | return 0; |
4c076fb4 DD |
350 | } |
351 | ||
948b9c60 | 352 | static int octeon_wdt_cpu_online(unsigned int cpu) |
4c076fb4 DD |
353 | { |
354 | unsigned int core; | |
355 | unsigned int irq; | |
356 | union cvmx_ciu_wdogx ciu_wdog; | |
1d1821b2 CM |
357 | int node; |
358 | struct irq_domain *domain; | |
359 | int hwirq; | |
4c076fb4 DD |
360 | |
361 | core = cpu2core(cpu); | |
1d1821b2 | 362 | node = cpu_to_node(cpu); |
4c076fb4 | 363 | |
49d148b4 SH |
364 | octeon_wdt_bootvector[core].target_ptr = (u64)octeon_wdt_nmi_stage2; |
365 | ||
4c076fb4 DD |
366 | /* Disable it before doing anything with the interrupts. */ |
367 | ciu_wdog.u64 = 0; | |
1d1821b2 | 368 | cvmx_write_csr_node(node, CVMX_CIU_WDOGX(core), ciu_wdog.u64); |
4c076fb4 DD |
369 | |
370 | per_cpu_countdown[cpu] = countdown_reset; | |
371 | ||
1d1821b2 CM |
372 | if (octeon_has_feature(OCTEON_FEATURE_CIU3)) { |
373 | /* Must get the domain for the watchdog block */ | |
374 | domain = octeon_irq_get_block_domain(node, WD_BLOCK_NUMBER); | |
375 | ||
376 | /* Get a irq for the wd intsn (hardware interrupt) */ | |
377 | hwirq = WD_BLOCK_NUMBER << 12 | 0x200 | core; | |
378 | irq = irq_create_mapping(domain, hwirq); | |
379 | irqd_set_trigger_type(irq_get_irq_data(irq), | |
380 | IRQ_TYPE_EDGE_RISING); | |
381 | } else | |
382 | irq = OCTEON_IRQ_WDOG0 + core; | |
4c076fb4 DD |
383 | |
384 | if (request_irq(irq, octeon_wdt_poke_irq, | |
47bfd058 | 385 | IRQF_NO_THREAD, "octeon_wdt", octeon_wdt_poke_irq)) |
4c076fb4 DD |
386 | panic("octeon_wdt: Couldn't obtain irq %d", irq); |
387 | ||
1d1821b2 CM |
388 | /* Must set the irq affinity here */ |
389 | if (octeon_has_feature(OCTEON_FEATURE_CIU3)) { | |
390 | cpumask_t mask; | |
391 | ||
392 | cpumask_clear(&mask); | |
393 | cpumask_set_cpu(cpu, &mask); | |
394 | irq_set_affinity(irq, &mask); | |
395 | } | |
396 | ||
4c076fb4 DD |
397 | cpumask_set_cpu(cpu, &irq_enabled_cpus); |
398 | ||
399 | /* Poke the watchdog to clear out its state */ | |
1d1821b2 | 400 | cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(core), 1); |
4c076fb4 DD |
401 | |
402 | /* Finally enable the watchdog now that all handlers are installed */ | |
403 | ciu_wdog.u64 = 0; | |
404 | ciu_wdog.s.len = timeout_cnt; | |
405 | ciu_wdog.s.mode = 3; /* 3 = Interrupt + NMI + Soft-Reset */ | |
1d1821b2 | 406 | cvmx_write_csr_node(node, CVMX_CIU_WDOGX(core), ciu_wdog.u64); |
4c076fb4 | 407 | |
948b9c60 | 408 | return 0; |
4c076fb4 DD |
409 | } |
410 | ||
3d588c93 | 411 | static int octeon_wdt_ping(struct watchdog_device __always_unused *wdog) |
4c076fb4 DD |
412 | { |
413 | int cpu; | |
414 | int coreid; | |
1d1821b2 | 415 | int node; |
4c076fb4 | 416 | |
381cec02 SH |
417 | if (disable) |
418 | return 0; | |
419 | ||
4c076fb4 DD |
420 | for_each_online_cpu(cpu) { |
421 | coreid = cpu2core(cpu); | |
1d1821b2 CM |
422 | node = cpu_to_node(cpu); |
423 | cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(coreid), 1); | |
4c076fb4 | 424 | per_cpu_countdown[cpu] = countdown_reset; |
381cec02 | 425 | if ((countdown_reset || !do_countdown) && |
4c076fb4 DD |
426 | !cpumask_test_cpu(cpu, &irq_enabled_cpus)) { |
427 | /* We have to enable the irq */ | |
1d1821b2 | 428 | enable_irq(octeon_wdt_cpu_to_irq(cpu)); |
4c076fb4 DD |
429 | cpumask_set_cpu(cpu, &irq_enabled_cpus); |
430 | } | |
431 | } | |
3d588c93 | 432 | return 0; |
4c076fb4 DD |
433 | } |
434 | ||
435 | static void octeon_wdt_calc_parameters(int t) | |
436 | { | |
437 | unsigned int periods; | |
438 | ||
439 | timeout_sec = max_timeout_sec; | |
440 | ||
441 | ||
442 | /* | |
443 | * Find the largest interrupt period, that can evenly divide | |
444 | * the requested heartbeat time. | |
445 | */ | |
446 | while ((t % timeout_sec) != 0) | |
447 | timeout_sec--; | |
448 | ||
449 | periods = t / timeout_sec; | |
450 | ||
451 | /* | |
452 | * The last two periods are after the irq is disabled, and | |
453 | * then to the nmi, so we subtract them off. | |
454 | */ | |
455 | ||
456 | countdown_reset = periods > 2 ? periods - 2 : 0; | |
457 | heartbeat = t; | |
0cd4e7a9 | 458 | timeout_cnt = ((octeon_get_io_clock_rate() / divisor) * timeout_sec) >> 8; |
4c076fb4 DD |
459 | } |
460 | ||
3d588c93 AK |
461 | static int octeon_wdt_set_timeout(struct watchdog_device *wdog, |
462 | unsigned int t) | |
4c076fb4 DD |
463 | { |
464 | int cpu; | |
465 | int coreid; | |
466 | union cvmx_ciu_wdogx ciu_wdog; | |
1d1821b2 | 467 | int node; |
4c076fb4 DD |
468 | |
469 | if (t <= 0) | |
470 | return -1; | |
471 | ||
472 | octeon_wdt_calc_parameters(t); | |
473 | ||
381cec02 SH |
474 | if (disable) |
475 | return 0; | |
476 | ||
4c076fb4 DD |
477 | for_each_online_cpu(cpu) { |
478 | coreid = cpu2core(cpu); | |
1d1821b2 CM |
479 | node = cpu_to_node(cpu); |
480 | cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(coreid), 1); | |
4c076fb4 DD |
481 | ciu_wdog.u64 = 0; |
482 | ciu_wdog.s.len = timeout_cnt; | |
483 | ciu_wdog.s.mode = 3; /* 3 = Interrupt + NMI + Soft-Reset */ | |
1d1821b2 CM |
484 | cvmx_write_csr_node(node, CVMX_CIU_WDOGX(coreid), ciu_wdog.u64); |
485 | cvmx_write_csr_node(node, CVMX_CIU_PP_POKEX(coreid), 1); | |
4c076fb4 | 486 | } |
3d588c93 | 487 | octeon_wdt_ping(wdog); /* Get the irqs back on. */ |
4c076fb4 DD |
488 | return 0; |
489 | } | |
490 | ||
3d588c93 | 491 | static int octeon_wdt_start(struct watchdog_device *wdog) |
4c076fb4 | 492 | { |
3d588c93 | 493 | octeon_wdt_ping(wdog); |
381cec02 | 494 | do_countdown = 1; |
3d588c93 | 495 | return 0; |
4c076fb4 DD |
496 | } |
497 | ||
3d588c93 | 498 | static int octeon_wdt_stop(struct watchdog_device *wdog) |
4c076fb4 | 499 | { |
381cec02 | 500 | do_countdown = 0; |
3d588c93 | 501 | octeon_wdt_ping(wdog); |
4c076fb4 DD |
502 | return 0; |
503 | } | |
504 | ||
3d588c93 AK |
505 | static const struct watchdog_info octeon_wdt_info = { |
506 | .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, | |
507 | .identity = "OCTEON", | |
4c076fb4 DD |
508 | }; |
509 | ||
3d588c93 AK |
510 | static const struct watchdog_ops octeon_wdt_ops = { |
511 | .owner = THIS_MODULE, | |
512 | .start = octeon_wdt_start, | |
513 | .stop = octeon_wdt_stop, | |
514 | .ping = octeon_wdt_ping, | |
515 | .set_timeout = octeon_wdt_set_timeout, | |
4c076fb4 DD |
516 | }; |
517 | ||
3d588c93 AK |
518 | static struct watchdog_device octeon_wdt = { |
519 | .info = &octeon_wdt_info, | |
520 | .ops = &octeon_wdt_ops, | |
521 | }; | |
4c076fb4 | 522 | |
948b9c60 | 523 | static enum cpuhp_state octeon_wdt_online; |
4c076fb4 DD |
524 | /** |
525 | * Module/ driver initialization. | |
526 | * | |
527 | * Returns Zero on success | |
528 | */ | |
529 | static int __init octeon_wdt_init(void) | |
530 | { | |
4c076fb4 | 531 | int ret; |
4c076fb4 | 532 | |
49d148b4 SH |
533 | octeon_wdt_bootvector = cvmx_boot_vector_get(); |
534 | if (!octeon_wdt_bootvector) { | |
535 | pr_err("Error: Cannot allocate boot vector.\n"); | |
536 | return -ENOMEM; | |
537 | } | |
538 | ||
0cd4e7a9 DD |
539 | if (OCTEON_IS_MODEL(OCTEON_CN68XX)) |
540 | divisor = 0x200; | |
1d1821b2 CM |
541 | else if (OCTEON_IS_MODEL(OCTEON_CN78XX)) |
542 | divisor = 0x400; | |
0cd4e7a9 DD |
543 | else |
544 | divisor = 0x100; | |
545 | ||
4c076fb4 DD |
546 | /* |
547 | * Watchdog time expiration length = The 16 bits of LEN | |
548 | * represent the most significant bits of a 24 bit decrementer | |
0cd4e7a9 | 549 | * that decrements every divisor cycle. |
4c076fb4 DD |
550 | * |
551 | * Try for a timeout of 5 sec, if that fails a smaller number | |
552 | * of even seconds, | |
553 | */ | |
554 | max_timeout_sec = 6; | |
555 | do { | |
556 | max_timeout_sec--; | |
0cd4e7a9 | 557 | timeout_cnt = ((octeon_get_io_clock_rate() / divisor) * max_timeout_sec) >> 8; |
4c076fb4 DD |
558 | } while (timeout_cnt > 65535); |
559 | ||
560 | BUG_ON(timeout_cnt == 0); | |
561 | ||
562 | octeon_wdt_calc_parameters(heartbeat); | |
563 | ||
27c766aa | 564 | pr_info("Initial granularity %d Sec\n", timeout_sec); |
4c076fb4 | 565 | |
3d588c93 AK |
566 | octeon_wdt.timeout = timeout_sec; |
567 | octeon_wdt.max_timeout = UINT_MAX; | |
568 | ||
569 | watchdog_set_nowayout(&octeon_wdt, nowayout); | |
570 | ||
571 | ret = watchdog_register_device(&octeon_wdt); | |
4c076fb4 | 572 | if (ret) { |
3d588c93 AK |
573 | pr_err("watchdog_register_device() failed: %d\n", ret); |
574 | return ret; | |
4c076fb4 DD |
575 | } |
576 | ||
381cec02 SH |
577 | if (disable) { |
578 | pr_notice("disabled\n"); | |
579 | return 0; | |
580 | } | |
581 | ||
4c076fb4 DD |
582 | cpumask_clear(&irq_enabled_cpus); |
583 | ||
948b9c60 SAS |
584 | ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "watchdog/octeon:online", |
585 | octeon_wdt_cpu_online, octeon_wdt_cpu_pre_down); | |
586 | if (ret < 0) | |
587 | goto err; | |
588 | octeon_wdt_online = ret; | |
3d588c93 | 589 | return 0; |
948b9c60 SAS |
590 | err: |
591 | cvmx_write_csr(CVMX_MIO_BOOT_LOC_CFGX(0), 0); | |
592 | watchdog_unregister_device(&octeon_wdt); | |
593 | return ret; | |
4c076fb4 DD |
594 | } |
595 | ||
596 | /** | |
597 | * Module / driver shutdown | |
598 | */ | |
599 | static void __exit octeon_wdt_cleanup(void) | |
600 | { | |
3d588c93 | 601 | watchdog_unregister_device(&octeon_wdt); |
381cec02 SH |
602 | |
603 | if (disable) | |
604 | return; | |
605 | ||
948b9c60 | 606 | cpuhp_remove_state(octeon_wdt_online); |
99c3bf36 | 607 | |
4c076fb4 DD |
608 | /* |
609 | * Disable the boot-bus memory, the code it points to is soon | |
610 | * to go missing. | |
611 | */ | |
612 | cvmx_write_csr(CVMX_MIO_BOOT_LOC_CFGX(0), 0); | |
613 | } | |
614 | ||
615 | MODULE_LICENSE("GPL"); | |
381cec02 SH |
616 | MODULE_AUTHOR("Cavium Inc. <support@cavium.com>"); |
617 | MODULE_DESCRIPTION("Cavium Inc. OCTEON Watchdog driver."); | |
4c076fb4 DD |
618 | module_init(octeon_wdt_init); |
619 | module_exit(octeon_wdt_cleanup); |