2 * PowerNV OPAL high level interfaces
4 * Copyright 2011 IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
14 #include <linux/types.h>
16 #include <linux/of_platform.h>
17 #include <linux/interrupt.h>
18 #include <linux/slab.h>
20 #include <asm/firmware.h>
29 static struct device_node *opal_node;
30 static DEFINE_SPINLOCK(opal_write_lock);
31 extern u64 opal_mc_secondary_handler[];
32 static unsigned int *opal_irqs;
33 static unsigned int opal_irq_count;
35 int __init early_init_dt_scan_opal(unsigned long node,
36 const char *uname, int depth, void *data)
38 const void *basep, *entryp;
39 unsigned long basesz, entrysz;
41 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
44 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
45 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
47 if (!basep || !entryp)
50 opal.base = of_read_number(basep, basesz/4);
51 opal.entry = of_read_number(entryp, entrysz/4);
53 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%ld)\n",
54 opal.base, basep, basesz);
55 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n",
56 opal.entry, entryp, entrysz);
58 powerpc_firmware_features |= FW_FEATURE_OPAL;
59 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
60 powerpc_firmware_features |= FW_FEATURE_OPALv2;
61 powerpc_firmware_features |= FW_FEATURE_OPALv3;
62 printk("OPAL V3 detected !\n");
63 } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
64 powerpc_firmware_features |= FW_FEATURE_OPALv2;
65 printk("OPAL V2 detected !\n");
67 printk("OPAL V1 detected !\n");
73 static int __init opal_register_exception_handlers(void)
77 if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
80 /* Hookup some exception handlers. We use the fwnmi area at 0x7000
81 * to provide the glue space to OPAL
84 opal_register_exception_handler(OPAL_MACHINE_CHECK_HANDLER,
85 __pa(opal_mc_secondary_handler[0]),
88 opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
91 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
96 early_initcall(opal_register_exception_handlers);
98 int opal_get_chars(uint32_t vtermno, char *buf, int count)
105 opal_poll_events(&evt);
106 if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0)
109 rc = opal_console_read(vtermno, &len, buf);
110 if (rc == OPAL_SUCCESS)
115 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
125 /* We want put_chars to be atomic to avoid mangling of hvsi
126 * packets. To do that, we first test for room and return
127 * -EAGAIN if there isn't enough.
129 * Unfortunately, opal_console_write_buffer_space() doesn't
130 * appear to work on opal v1, so we just assume there is
131 * enough room and be done with it
133 spin_lock_irqsave(&opal_write_lock, flags);
134 if (firmware_has_feature(FW_FEATURE_OPALv2)) {
135 rc = opal_console_write_buffer_space(vtermno, &len);
136 if (rc || len < total_len) {
137 spin_unlock_irqrestore(&opal_write_lock, flags);
138 /* Closed -> drop characters */
141 opal_poll_events(&evt);
146 /* We still try to handle partial completions, though they
147 * should no longer happen.
150 while(total_len > 0 && (rc == OPAL_BUSY ||
151 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
153 rc = opal_console_write(vtermno, &len, data);
155 /* Closed or other error drop */
156 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
157 rc != OPAL_BUSY_EVENT) {
161 if (rc == OPAL_SUCCESS) {
166 /* This is a bit nasty but we need that for the console to
167 * flush when there aren't any interrupts. We will clean
168 * things a bit later to limit that to synchronous path
169 * such as the kernel console and xmon/udbg
172 opal_poll_events(&evt);
173 while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT));
175 spin_unlock_irqrestore(&opal_write_lock, flags);
179 int opal_machine_check(struct pt_regs *regs)
181 struct opal_machine_check_event *opal_evt = get_paca()->opal_mc_evt;
182 struct opal_machine_check_event evt;
183 const char *level, *sevstr, *subtype;
184 static const char *opal_mc_ue_types[] = {
187 "Page table walk ifetch",
189 "Page table walk Load/Store",
191 static const char *opal_mc_slb_types[] = {
196 static const char *opal_mc_erat_types[] = {
201 static const char *opal_mc_tlb_types[] = {
207 /* Copy the event structure and release the original */
209 opal_evt->in_use = 0;
211 /* Print things out */
212 if (evt.version != OpalMCE_V1) {
213 pr_err("Machine Check Exception, Unknown event version %d !\n",
217 switch(evt.severity) {
218 case OpalMCE_SEV_NO_ERROR:
222 case OpalMCE_SEV_WARNING:
223 level = KERN_WARNING;
226 case OpalMCE_SEV_ERROR_SYNC:
230 case OpalMCE_SEV_FATAL:
237 printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
238 evt.disposition == OpalMCE_DISPOSITION_RECOVERED ?
239 "Recovered" : "[Not recovered");
240 printk("%s Initiator: %s\n", level,
241 evt.initiator == OpalMCE_INITIATOR_CPU ? "CPU" : "Unknown");
242 switch(evt.error_type) {
243 case OpalMCE_ERROR_TYPE_UE:
244 subtype = evt.u.ue_error.ue_error_type <
245 ARRAY_SIZE(opal_mc_ue_types) ?
246 opal_mc_ue_types[evt.u.ue_error.ue_error_type]
248 printk("%s Error type: UE [%s]\n", level, subtype);
249 if (evt.u.ue_error.effective_address_provided)
250 printk("%s Effective address: %016llx\n",
251 level, evt.u.ue_error.effective_address);
252 if (evt.u.ue_error.physical_address_provided)
253 printk("%s Physial address: %016llx\n",
254 level, evt.u.ue_error.physical_address);
256 case OpalMCE_ERROR_TYPE_SLB:
257 subtype = evt.u.slb_error.slb_error_type <
258 ARRAY_SIZE(opal_mc_slb_types) ?
259 opal_mc_slb_types[evt.u.slb_error.slb_error_type]
261 printk("%s Error type: SLB [%s]\n", level, subtype);
262 if (evt.u.slb_error.effective_address_provided)
263 printk("%s Effective address: %016llx\n",
264 level, evt.u.slb_error.effective_address);
266 case OpalMCE_ERROR_TYPE_ERAT:
267 subtype = evt.u.erat_error.erat_error_type <
268 ARRAY_SIZE(opal_mc_erat_types) ?
269 opal_mc_erat_types[evt.u.erat_error.erat_error_type]
271 printk("%s Error type: ERAT [%s]\n", level, subtype);
272 if (evt.u.erat_error.effective_address_provided)
273 printk("%s Effective address: %016llx\n",
274 level, evt.u.erat_error.effective_address);
276 case OpalMCE_ERROR_TYPE_TLB:
277 subtype = evt.u.tlb_error.tlb_error_type <
278 ARRAY_SIZE(opal_mc_tlb_types) ?
279 opal_mc_tlb_types[evt.u.tlb_error.tlb_error_type]
281 printk("%s Error type: TLB [%s]\n", level, subtype);
282 if (evt.u.tlb_error.effective_address_provided)
283 printk("%s Effective address: %016llx\n",
284 level, evt.u.tlb_error.effective_address);
287 case OpalMCE_ERROR_TYPE_UNKNOWN:
288 printk("%s Error type: Unknown\n", level);
291 return evt.severity == OpalMCE_SEV_FATAL ? 0 : 1;
294 static irqreturn_t opal_interrupt(int irq, void *data)
298 opal_handle_interrupt(virq_to_hw(irq), &events);
300 /* XXX TODO: Do something with the events */
305 static int __init opal_init(void)
307 struct device_node *np, *consoles;
311 opal_node = of_find_node_by_path("/ibm,opal");
313 pr_warn("opal: Node not found\n");
316 if (firmware_has_feature(FW_FEATURE_OPALv2))
317 consoles = of_find_node_by_path("/ibm,opal/consoles");
319 consoles = of_node_get(opal_node);
321 /* Register serial ports */
322 for_each_child_of_node(consoles, np) {
323 if (strcmp(np->name, "serial"))
325 of_platform_device_create(np, NULL, NULL);
327 of_node_put(consoles);
329 /* Find all OPAL interrupts and request them */
330 irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
331 pr_debug("opal: Found %d interrupts reserved for OPAL\n",
332 irqs ? (irqlen / 4) : 0);
333 opal_irq_count = irqlen / 4;
334 opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL);
335 for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
336 unsigned int hwirq = be32_to_cpup(irqs);
337 unsigned int irq = irq_create_mapping(NULL, hwirq);
339 pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
342 rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
344 pr_warning("opal: Error %d requesting irq %d"
345 " (0x%x)\n", rc, irq, hwirq);
350 subsys_initcall(opal_init);
352 void opal_shutdown(void)
356 for (i = 0; i < opal_irq_count; i++) {
358 free_irq(opal_irqs[i], 0);