2 * Copyright 2006-2008, IBM Corporation.
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.
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/smp.h>
16 #include <linux/reboot.h>
17 #include <linux/kexec.h>
18 #include <linux/crash_dump.h>
20 #include <asm/kexec.h>
24 #include <asm/machdep.h>
26 #include <asm/cell-regs.h>
31 static void dump_fir(int cpu)
33 struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu);
34 struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu);
39 /* Todo: do some nicer parsing of bits and based on them go down
40 * to other sub-units FIRs and not only IIC
42 printk(KERN_ERR "Global Checkstop FIR : 0x%016llx\n",
43 in_be64(&pregs->checkstop_fir));
44 printk(KERN_ERR "Global Recoverable FIR : 0x%016llx\n",
45 in_be64(&pregs->checkstop_fir));
46 printk(KERN_ERR "Global MachineCheck FIR : 0x%016llx\n",
47 in_be64(&pregs->spec_att_mchk_fir));
51 printk(KERN_ERR "IOC FIR : 0x%016llx\n",
52 in_be64(&iregs->ioc_fir));
56 void cbe_system_error_exception(struct pt_regs *regs)
58 int cpu = smp_processor_id();
60 printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu);
65 void cbe_maintenance_exception(struct pt_regs *regs)
67 int cpu = smp_processor_id();
70 * Nothing implemented for the maintenance interrupt at this point
73 printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu);
77 void cbe_thermal_exception(struct pt_regs *regs)
79 int cpu = smp_processor_id();
82 * Nothing implemented for the thermal interrupt at this point
85 printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu);
89 static int cbe_machine_check_handler(struct pt_regs *regs)
91 int cpu = smp_processor_id();
93 printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu);
96 /* No recovery from this code now, lets continue */
101 struct list_head list;
107 static LIST_HEAD(ptcal_list);
109 static int ptcal_start_tok, ptcal_stop_tok;
111 static int __init cbe_ptcal_enable_on_node(int nid, int order)
113 struct ptcal_area *area;
117 if (is_kdump_kernel())
118 rtas_call(ptcal_stop_tok, 1, 1, NULL, nid);
120 area = kmalloc(sizeof(*area), GFP_KERNEL);
126 area->pages = alloc_pages_exact_node(area->nid,
127 GFP_KERNEL|__GFP_THISNODE,
131 printk(KERN_WARNING "%s: no page on node %d\n",
132 __func__, area->nid);
137 * We move the ptcal area to the middle of the allocated
138 * page, in order to avoid prefetches in memcpy and similar
139 * functions stepping on it.
141 addr = __pa(page_address(area->pages)) + (PAGE_SIZE >> 1);
142 printk(KERN_DEBUG "%s: enabling PTCAL on node %d address=0x%016lx\n",
143 __func__, area->nid, addr);
146 if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid,
147 (unsigned int)(addr >> 32),
148 (unsigned int)(addr & 0xffffffff))) {
149 printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n",
154 list_add(&area->list, &ptcal_list);
159 __free_pages(area->pages, area->order);
166 static int __init cbe_ptcal_enable(void)
169 struct device_node *np;
170 int order, found_mic = 0;
172 np = of_find_node_by_path("/rtas");
176 size = of_get_property(np, "ibm,cbe-ptcal-size", NULL);
182 pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size);
183 order = get_order(*size);
186 /* support for malta device trees, with be@/mic@ nodes */
187 for_each_node_by_type(np, "mic-tm") {
188 cbe_ptcal_enable_on_node(of_node_to_nid(np), order);
195 /* support for older device tree - use cpu nodes */
196 for_each_node_by_type(np, "cpu") {
197 const u32 *nid = of_get_property(np, "node-id", NULL);
199 printk(KERN_ERR "%s: node %s is missing node-id?\n",
200 __func__, np->full_name);
203 cbe_ptcal_enable_on_node(*nid, order);
207 return found_mic ? 0 : -ENODEV;
210 static int cbe_ptcal_disable(void)
212 struct ptcal_area *area, *tmp;
215 pr_debug("%s: disabling PTCAL\n", __func__);
217 list_for_each_entry_safe(area, tmp, &ptcal_list, list) {
218 /* disable ptcal on this node */
219 if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) {
220 printk(KERN_ERR "%s: error disabling PTCAL "
221 "on node %d!\n", __func__,
227 /* ensure we can access the PTCAL area */
228 memset(page_address(area->pages), 0,
229 1 << (area->order + PAGE_SHIFT));
232 list_del(&area->list);
233 __free_pages(area->pages, area->order);
240 static int cbe_ptcal_notify_reboot(struct notifier_block *nb,
241 unsigned long code, void *data)
243 return cbe_ptcal_disable();
246 static void cbe_ptcal_crash_shutdown(void)
251 static struct notifier_block cbe_ptcal_reboot_notifier = {
252 .notifier_call = cbe_ptcal_notify_reboot
255 #ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON
256 static int sysreset_hack;
258 static int __init cbe_sysreset_init(void)
260 struct cbe_pmd_regs __iomem *regs;
262 sysreset_hack = of_machine_is_compatible("IBM,CBPLUS-1.0");
266 regs = cbe_get_cpu_pmd_regs(0);
270 /* Enable JTAG system-reset hack */
271 out_be32(®s->fir_mode_reg,
272 in_be32(®s->fir_mode_reg) |
273 CBE_PMD_FIR_MODE_M8);
277 device_initcall(cbe_sysreset_init);
279 int cbe_sysreset_hack(void)
281 struct cbe_pmd_regs __iomem *regs;
284 * The BMC can inject user triggered system reset exceptions,
285 * but cannot set the system reset reason in srr1,
286 * so check an extra register here.
288 if (sysreset_hack && (smp_processor_id() == 0)) {
289 regs = cbe_get_cpu_pmd_regs(0);
292 if (in_be64(®s->ras_esc_0) & 0x0000ffff) {
293 out_be64(®s->ras_esc_0, 0);
299 #endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */
301 int __init cbe_ptcal_init(void)
304 ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal");
305 ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal");
307 if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE
308 || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE)
311 ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier);
315 ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown);
319 return cbe_ptcal_enable();
322 unregister_reboot_notifier(&cbe_ptcal_reboot_notifier);
324 printk(KERN_ERR "Can't disable PTCAL, so not enabling\n");
328 arch_initcall(cbe_ptcal_init);
330 void __init cbe_ras_init(void)
335 * Enable System Error & thermal interrupts and wakeup conditions
338 hid0 = mfspr(SPRN_HID0);
339 hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP |
340 HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP;
341 mtspr(SPRN_HID0, hid0);
345 * Install machine check handler. Leave setting of precise mode to
346 * what the firmware did for now
348 ppc_md.machine_check_exception = cbe_machine_check_handler;
352 * For now, we assume that IOC_FIR is already set to forward some
353 * error conditions to the System Error handler. If that is not true
354 * then it will have to be fixed up here.