blob: 5f961c464cc404dcdcb76f84b41f2e5cd6c7fe05 [file] [log] [blame]
Michael Ellermanbdb226b2008-02-14 13:34:17 +11001/*
2 * Copyright 2006-2008, IBM Corporation.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#undef DEBUG
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020011
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020012#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/smp.h>
Jeremy Kerr150f7e32007-04-23 21:35:47 +020015#include <linux/reboot.h>
Milton Miller62a8bd62008-10-22 15:39:04 -050016#include <linux/kexec.h>
17#include <linux/crash_dump.h>
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020018
Alexey Dobriyan9c8b4af2008-11-02 10:21:57 +000019#include <asm/kexec.h>
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020020#include <asm/reg.h>
21#include <asm/io.h>
22#include <asm/prom.h>
23#include <asm/machdep.h>
Jeremy Kerr150f7e32007-04-23 21:35:47 +020024#include <asm/rtas.h>
Benjamin Herrenschmidteef686a02007-10-04 15:40:42 +100025#include <asm/cell-regs.h>
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020026
27#include "ras.h"
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020028
29
30static void dump_fir(int cpu)
31{
32 struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu);
33 struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu);
34
35 if (pregs == NULL)
36 return;
37
38 /* Todo: do some nicer parsing of bits and based on them go down
39 * to other sub-units FIRs and not only IIC
40 */
Ingo Molnarfe333322009-01-06 14:26:03 +000041 printk(KERN_ERR "Global Checkstop FIR : 0x%016llx\n",
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020042 in_be64(&pregs->checkstop_fir));
Ingo Molnarfe333322009-01-06 14:26:03 +000043 printk(KERN_ERR "Global Recoverable FIR : 0x%016llx\n",
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020044 in_be64(&pregs->checkstop_fir));
Ingo Molnarfe333322009-01-06 14:26:03 +000045 printk(KERN_ERR "Global MachineCheck FIR : 0x%016llx\n",
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020046 in_be64(&pregs->spec_att_mchk_fir));
47
48 if (iregs == NULL)
49 return;
Ingo Molnarfe333322009-01-06 14:26:03 +000050 printk(KERN_ERR "IOC FIR : 0x%016llx\n",
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020051 in_be64(&iregs->ioc_fir));
52
53}
54
55void cbe_system_error_exception(struct pt_regs *regs)
56{
57 int cpu = smp_processor_id();
58
59 printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu);
60 dump_fir(cpu);
61 dump_stack();
62}
63
64void cbe_maintenance_exception(struct pt_regs *regs)
65{
66 int cpu = smp_processor_id();
67
68 /*
69 * Nothing implemented for the maintenance interrupt at this point
70 */
71
72 printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu);
73 dump_stack();
74}
75
76void cbe_thermal_exception(struct pt_regs *regs)
77{
78 int cpu = smp_processor_id();
79
80 /*
81 * Nothing implemented for the thermal interrupt at this point
82 */
83
84 printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu);
85 dump_stack();
86}
87
88static int cbe_machine_check_handler(struct pt_regs *regs)
89{
90 int cpu = smp_processor_id();
91
92 printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu);
93 dump_fir(cpu);
94
95 /* No recovery from this code now, lets continue */
96 return 0;
97}
98
Jeremy Kerr150f7e32007-04-23 21:35:47 +020099struct ptcal_area {
100 struct list_head list;
101 int nid;
102 int order;
103 struct page *pages;
104};
105
106static LIST_HEAD(ptcal_list);
107
108static int ptcal_start_tok, ptcal_stop_tok;
109
110static int __init cbe_ptcal_enable_on_node(int nid, int order)
111{
112 struct ptcal_area *area;
113 int ret = -ENOMEM;
114 unsigned long addr;
115
Milton Miller62a8bd62008-10-22 15:39:04 -0500116 if (is_kdump_kernel())
Mohan Kumar M54622f12008-10-21 17:38:10 +0000117 rtas_call(ptcal_stop_tok, 1, 1, NULL, nid);
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200118
119 area = kmalloc(sizeof(*area), GFP_KERNEL);
120 if (!area)
121 goto out_err;
122
123 area->nid = nid;
124 area->order = order;
125 area->pages = alloc_pages_node(area->nid, GFP_KERNEL, area->order);
126
127 if (!area->pages)
128 goto out_free_area;
129
130 addr = __pa(page_address(area->pages));
131
132 ret = -EIO;
133 if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid,
134 (unsigned int)(addr >> 32),
135 (unsigned int)(addr & 0xffffffff))) {
136 printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100137 __func__, nid);
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200138 goto out_free_pages;
139 }
140
141 list_add(&area->list, &ptcal_list);
142
143 return 0;
144
145out_free_pages:
146 __free_pages(area->pages, area->order);
147out_free_area:
148 kfree(area);
149out_err:
150 return ret;
151}
152
153static int __init cbe_ptcal_enable(void)
154{
155 const u32 *size;
156 struct device_node *np;
157 int order, found_mic = 0;
158
159 np = of_find_node_by_path("/rtas");
160 if (!np)
161 return -ENODEV;
162
Stephen Rothwell12d371a2007-04-29 16:29:08 +1000163 size = of_get_property(np, "ibm,cbe-ptcal-size", NULL);
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200164 if (!size)
165 return -ENODEV;
166
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100167 pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size);
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200168 order = get_order(*size);
169 of_node_put(np);
170
171 /* support for malta device trees, with be@/mic@ nodes */
172 for_each_node_by_type(np, "mic-tm") {
173 cbe_ptcal_enable_on_node(of_node_to_nid(np), order);
174 found_mic = 1;
175 }
176
177 if (found_mic)
178 return 0;
179
180 /* support for older device tree - use cpu nodes */
181 for_each_node_by_type(np, "cpu") {
Stephen Rothwell12d371a2007-04-29 16:29:08 +1000182 const u32 *nid = of_get_property(np, "node-id", NULL);
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200183 if (!nid) {
184 printk(KERN_ERR "%s: node %s is missing node-id?\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100185 __func__, np->full_name);
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200186 continue;
187 }
188 cbe_ptcal_enable_on_node(*nid, order);
189 found_mic = 1;
190 }
191
192 return found_mic ? 0 : -ENODEV;
193}
194
195static int cbe_ptcal_disable(void)
196{
197 struct ptcal_area *area, *tmp;
198 int ret = 0;
199
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100200 pr_debug("%s: disabling PTCAL\n", __func__);
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200201
202 list_for_each_entry_safe(area, tmp, &ptcal_list, list) {
203 /* disable ptcal on this node */
204 if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) {
205 printk(KERN_ERR "%s: error disabling PTCAL "
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100206 "on node %d!\n", __func__,
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200207 area->nid);
208 ret = -EIO;
209 continue;
210 }
211
212 /* ensure we can access the PTCAL area */
213 memset(page_address(area->pages), 0,
214 1 << (area->order + PAGE_SHIFT));
215
216 /* clean up */
217 list_del(&area->list);
218 __free_pages(area->pages, area->order);
219 kfree(area);
220 }
221
222 return ret;
223}
224
225static int cbe_ptcal_notify_reboot(struct notifier_block *nb,
226 unsigned long code, void *data)
227{
228 return cbe_ptcal_disable();
229}
230
Arnd Bergmann5acb0802008-06-12 19:14:36 +1000231static void cbe_ptcal_crash_shutdown(void)
232{
233 cbe_ptcal_disable();
234}
235
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200236static struct notifier_block cbe_ptcal_reboot_notifier = {
237 .notifier_call = cbe_ptcal_notify_reboot
238};
239
Christian Krafft70694a82008-07-16 05:51:44 +1000240#ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON
241static int sysreset_hack;
242
243static int __init cbe_sysreset_init(void)
244{
245 struct cbe_pmd_regs __iomem *regs;
246
247 sysreset_hack = machine_is_compatible("IBM,CBPLUS-1.0");
248 if (!sysreset_hack)
249 return 0;
250
251 regs = cbe_get_cpu_pmd_regs(0);
252 if (!regs)
253 return 0;
254
255 /* Enable JTAG system-reset hack */
256 out_be32(&regs->fir_mode_reg,
257 in_be32(&regs->fir_mode_reg) |
258 CBE_PMD_FIR_MODE_M8);
259
260 return 0;
261}
262device_initcall(cbe_sysreset_init);
263
264int cbe_sysreset_hack(void)
265{
266 struct cbe_pmd_regs __iomem *regs;
267
268 /*
269 * The BMC can inject user triggered system reset exceptions,
270 * but cannot set the system reset reason in srr1,
271 * so check an extra register here.
272 */
273 if (sysreset_hack && (smp_processor_id() == 0)) {
274 regs = cbe_get_cpu_pmd_regs(0);
275 if (!regs)
276 return 0;
277 if (in_be64(&regs->ras_esc_0) & 0x0000ffff) {
278 out_be64(&regs->ras_esc_0, 0);
279 return 0;
280 }
281 }
282 return 1;
283}
284#endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */
285
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200286int __init cbe_ptcal_init(void)
287{
288 int ret;
289 ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal");
290 ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal");
291
292 if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE
293 || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE)
294 return -ENODEV;
295
296 ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier);
Arnd Bergmann5acb0802008-06-12 19:14:36 +1000297 if (ret)
298 goto out1;
299
300 ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown);
301 if (ret)
302 goto out2;
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200303
304 return cbe_ptcal_enable();
Arnd Bergmann5acb0802008-06-12 19:14:36 +1000305
306out2:
307 unregister_reboot_notifier(&cbe_ptcal_reboot_notifier);
308out1:
309 printk(KERN_ERR "Can't disable PTCAL, so not enabling\n");
310 return ret;
Jeremy Kerr150f7e32007-04-23 21:35:47 +0200311}
312
313arch_initcall(cbe_ptcal_init);
314
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +0200315void __init cbe_ras_init(void)
316{
317 unsigned long hid0;
318
319 /*
320 * Enable System Error & thermal interrupts and wakeup conditions
321 */
322
323 hid0 = mfspr(SPRN_HID0);
324 hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP |
325 HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP;
326 mtspr(SPRN_HID0, hid0);
327 mb();
328
329 /*
330 * Install machine check handler. Leave setting of precise mode to
331 * what the firmware did for now
332 */
333 ppc_md.machine_check_exception = cbe_machine_check_handler;
334 mb();
335
336 /*
337 * For now, we assume that IOC_FIR is already set to forward some
338 * error conditions to the System Error handler. If that is not true
339 * then it will have to be fixed up here.
340 */
341}