1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright 2006-2008, IBM Corporation.
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/smp.h>
12 #include <linux/reboot.h>
13 #include <linux/kexec.h>
14 #include <linux/crash_dump.h>
17 #include <asm/kexec.h>
20 #include <asm/machdep.h>
22 #include <asm/cell-regs.h>
25 #include "pervasive.h"
27 static void dump_fir(int cpu)
29 struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu);
30 struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu);
35 /* Todo: do some nicer parsing of bits and based on them go down
36 * to other sub-units FIRs and not only IIC
38 printk(KERN_ERR "Global Checkstop FIR : 0x%016llx\n",
39 in_be64(&pregs->checkstop_fir));
40 printk(KERN_ERR "Global Recoverable FIR : 0x%016llx\n",
41 in_be64(&pregs->checkstop_fir));
42 printk(KERN_ERR "Global MachineCheck FIR : 0x%016llx\n",
43 in_be64(&pregs->spec_att_mchk_fir));
47 printk(KERN_ERR "IOC FIR : 0x%016llx\n",
48 in_be64(&iregs->ioc_fir));
52 DEFINE_INTERRUPT_HANDLER(cbe_system_error_exception)
54 int cpu = smp_processor_id();
56 printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu);
61 DEFINE_INTERRUPT_HANDLER(cbe_maintenance_exception)
63 int cpu = smp_processor_id();
66 * Nothing implemented for the maintenance interrupt at this point
69 printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu);
73 DEFINE_INTERRUPT_HANDLER(cbe_thermal_exception)
75 int cpu = smp_processor_id();
78 * Nothing implemented for the thermal interrupt at this point
81 printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu);
85 static int cbe_machine_check_handler(struct pt_regs *regs)
87 int cpu = smp_processor_id();
89 printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu);
92 /* No recovery from this code now, lets continue */
97 struct list_head list;
103 static LIST_HEAD(ptcal_list);
105 static int ptcal_start_tok, ptcal_stop_tok;
107 static int __init cbe_ptcal_enable_on_node(int nid, int order)
109 struct ptcal_area *area;
113 if (is_kdump_kernel())
114 rtas_call(ptcal_stop_tok, 1, 1, NULL, nid);
116 area = kmalloc(sizeof(*area), GFP_KERNEL);
122 area->pages = __alloc_pages_node(area->nid,
123 GFP_KERNEL|__GFP_THISNODE,
127 printk(KERN_WARNING "%s: no page on node %d\n",
128 __func__, area->nid);
133 * We move the ptcal area to the middle of the allocated
134 * page, in order to avoid prefetches in memcpy and similar
135 * functions stepping on it.
137 addr = __pa(page_address(area->pages)) + (PAGE_SIZE >> 1);
138 printk(KERN_DEBUG "%s: enabling PTCAL on node %d address=0x%016lx\n",
139 __func__, area->nid, addr);
142 if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid,
143 (unsigned int)(addr >> 32),
144 (unsigned int)(addr & 0xffffffff))) {
145 printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n",
150 list_add(&area->list, &ptcal_list);
155 __free_pages(area->pages, area->order);
162 static int __init cbe_ptcal_enable(void)
165 struct device_node *np;
166 int order, found_mic = 0;
168 np = of_find_node_by_path("/rtas");
172 size = of_get_property(np, "ibm,cbe-ptcal-size", NULL);
178 pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size);
179 order = get_order(*size);
182 /* support for malta device trees, with be@/mic@ nodes */
183 for_each_node_by_type(np, "mic-tm") {
184 cbe_ptcal_enable_on_node(of_node_to_nid(np), order);
191 /* support for older device tree - use cpu nodes */
192 for_each_node_by_type(np, "cpu") {
193 const u32 *nid = of_get_property(np, "node-id", NULL);
195 printk(KERN_ERR "%s: node %pOF is missing node-id?\n",
199 cbe_ptcal_enable_on_node(*nid, order);
203 return found_mic ? 0 : -ENODEV;
206 static int cbe_ptcal_disable(void)
208 struct ptcal_area *area, *tmp;
211 pr_debug("%s: disabling PTCAL\n", __func__);
213 list_for_each_entry_safe(area, tmp, &ptcal_list, list) {
214 /* disable ptcal on this node */
215 if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) {
216 printk(KERN_ERR "%s: error disabling PTCAL "
217 "on node %d!\n", __func__,
223 /* ensure we can access the PTCAL area */
224 memset(page_address(area->pages), 0,
225 1 << (area->order + PAGE_SHIFT));
228 list_del(&area->list);
229 __free_pages(area->pages, area->order);
236 static int cbe_ptcal_notify_reboot(struct notifier_block *nb,
237 unsigned long code, void *data)
239 return cbe_ptcal_disable();
242 static void cbe_ptcal_crash_shutdown(void)
247 static struct notifier_block cbe_ptcal_reboot_notifier = {
248 .notifier_call = cbe_ptcal_notify_reboot
251 #ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON
252 static int sysreset_hack;
254 static int __init cbe_sysreset_init(void)
256 struct cbe_pmd_regs __iomem *regs;
258 sysreset_hack = of_machine_is_compatible("IBM,CBPLUS-1.0");
262 regs = cbe_get_cpu_pmd_regs(0);
266 /* Enable JTAG system-reset hack */
267 out_be32(®s->fir_mode_reg,
268 in_be32(®s->fir_mode_reg) |
269 CBE_PMD_FIR_MODE_M8);
273 device_initcall(cbe_sysreset_init);
275 int cbe_sysreset_hack(void)
277 struct cbe_pmd_regs __iomem *regs;
280 * The BMC can inject user triggered system reset exceptions,
281 * but cannot set the system reset reason in srr1,
282 * so check an extra register here.
284 if (sysreset_hack && (smp_processor_id() == 0)) {
285 regs = cbe_get_cpu_pmd_regs(0);
288 if (in_be64(®s->ras_esc_0) & 0x0000ffff) {
289 out_be64(®s->ras_esc_0, 0);
295 #endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */
297 static int __init cbe_ptcal_init(void)
300 ptcal_start_tok = rtas_function_token(RTAS_FN_IBM_CBE_START_PTCAL);
301 ptcal_stop_tok = rtas_function_token(RTAS_FN_IBM_CBE_STOP_PTCAL);
303 if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE
304 || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE)
307 ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier);
311 ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown);
315 return cbe_ptcal_enable();
318 unregister_reboot_notifier(&cbe_ptcal_reboot_notifier);
320 printk(KERN_ERR "Can't disable PTCAL, so not enabling\n");
324 arch_initcall(cbe_ptcal_init);
326 void __init cbe_ras_init(void)
331 * Enable System Error & thermal interrupts and wakeup conditions
334 hid0 = mfspr(SPRN_HID0);
335 hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP |
336 HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP;
337 mtspr(SPRN_HID0, hid0);
341 * Install machine check handler. Leave setting of precise mode to
342 * what the firmware did for now
344 ppc_md.machine_check_exception = cbe_machine_check_handler;
348 * For now, we assume that IOC_FIR is already set to forward some
349 * error conditions to the System Error handler. If that is not true
350 * then it will have to be fixed up here.