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/cpu.h>
15 #include <linux/errno.h>
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
18 #include <linux/tty.h>
19 #include <linux/reboot.h>
20 #include <linux/init.h>
21 #include <linux/console.h>
22 #include <linux/delay.h>
23 #include <linux/irq.h>
24 #include <linux/seq_file.h>
26 #include <linux/of_fdt.h>
27 #include <linux/interrupt.h>
28 #include <linux/bug.h>
29 #include <linux/pci.h>
30 #include <linux/cpufreq.h>
32 #include <asm/machdep.h>
33 #include <asm/firmware.h>
36 #include <asm/kexec.h>
41 static void __init pnv_setup_arch(void)
43 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
51 /* Setup RTC and NVRAM callbacks */
52 if (firmware_has_feature(FW_FEATURE_OPAL))
61 static void __init pnv_init_early(void)
64 * Initialize the LPC bus now so that legacy serial
65 * ports can be found on it
69 #ifdef CONFIG_HVC_OPAL
70 if (firmware_has_feature(FW_FEATURE_OPAL))
71 hvc_opal_init_early();
74 add_preferred_console("hvc", 0, NULL);
77 static void __init pnv_init_IRQ(void)
81 WARN_ON(!ppc_md.get_irq);
84 static void pnv_show_cpuinfo(struct seq_file *m)
86 struct device_node *root;
87 const char *model = "";
89 root = of_find_node_by_path("/");
91 model = of_get_property(root, "model", NULL);
92 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
93 if (firmware_has_feature(FW_FEATURE_OPALv3))
94 seq_printf(m, "firmware\t: OPAL v3\n");
95 else if (firmware_has_feature(FW_FEATURE_OPALv2))
96 seq_printf(m, "firmware\t: OPAL v2\n");
97 else if (firmware_has_feature(FW_FEATURE_OPAL))
98 seq_printf(m, "firmware\t: OPAL v1\n");
100 seq_printf(m, "firmware\t: BML\n");
104 static void pnv_prepare_going_down(void)
107 * Disable all notifiers from OPAL, we can't
108 * service interrupts anymore anyway
110 opal_event_shutdown();
112 /* Soft disable interrupts */
116 * Return secondary CPUs to firwmare if a flash update
117 * is pending otherwise we will get all sort of error
118 * messages about CPU being stuck etc.. This will also
119 * have the side effect of hard disabling interrupts so
120 * past this point, the kernel is effectively dead.
122 opal_flash_term_callback();
125 static void __noreturn pnv_restart(char *cmd)
129 pnv_prepare_going_down();
131 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
132 rc = opal_cec_reboot();
133 if (rc == OPAL_BUSY_EVENT)
134 opal_poll_events(NULL);
139 opal_poll_events(NULL);
142 static void __noreturn pnv_power_off(void)
146 pnv_prepare_going_down();
148 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
149 rc = opal_cec_power_down(0);
150 if (rc == OPAL_BUSY_EVENT)
151 opal_poll_events(NULL);
156 opal_poll_events(NULL);
159 static void __noreturn pnv_halt(void)
164 static void pnv_progress(char *s, unsigned short hex)
168 static void pnv_shutdown(void)
170 /* Let the PCI code clear up IODA tables */
174 * Stop OPAL activity: Unregister all OPAL interrupts so they
175 * don't fire up while we kexec and make sure all potentially
176 * DMA'ing ops are complete (such as dump retrieval).
182 static void pnv_kexec_wait_secondaries_down(void)
184 int my_cpu, i, notified = -1;
188 for_each_online_cpu(i) {
190 int64_t rc, timeout = 1000;
196 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
198 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
202 printk(KERN_INFO "kexec: waiting for cpu %d "
203 "(physical %d) to enter OPAL\n",
204 i, paca[i].hw_cpu_id);
209 * On crash secondaries might be unreachable or hung,
210 * so timeout if we've waited too long
213 if (timeout-- == 0) {
214 printk(KERN_ERR "kexec: timed out waiting for "
215 "cpu %d (physical %d) to enter OPAL\n",
216 i, paca[i].hw_cpu_id);
223 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
225 xics_kexec_teardown_cpu(secondary);
227 /* On OPAL v3, we return all CPUs to firmware */
229 if (!firmware_has_feature(FW_FEATURE_OPALv3))
233 /* Return secondary CPUs to firmware on OPAL v3 */
235 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
238 /* Return the CPU to OPAL */
241 /* Primary waits for the secondaries to have reached OPAL */
242 pnv_kexec_wait_secondaries_down();
245 * We might be running as little-endian - now that interrupts
246 * are disabled, reset the HILE bit to big-endian so we don't
247 * take interrupts in the wrong endian later
249 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
252 #endif /* CONFIG_KEXEC */
254 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
255 static unsigned long pnv_memory_block_size(void)
257 return 256UL * 1024 * 1024;
261 static void __init pnv_setup_machdep_opal(void)
263 ppc_md.get_boot_time = opal_get_boot_time;
264 ppc_md.restart = pnv_restart;
265 pm_power_off = pnv_power_off;
266 ppc_md.halt = pnv_halt;
267 ppc_md.machine_check_exception = opal_machine_check;
268 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
269 ppc_md.hmi_exception_early = opal_hmi_exception_early;
270 ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
273 static int __init pnv_probe(void)
275 unsigned long root = of_get_flat_dt_root();
277 if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
282 if (firmware_has_feature(FW_FEATURE_OPAL))
283 pnv_setup_machdep_opal();
285 pr_debug("PowerNV detected !\n");
291 * Returns the cpu frequency for 'cpu' in Hz. This is used by
294 static unsigned long pnv_get_proc_freq(unsigned int cpu)
296 unsigned long ret_freq;
298 ret_freq = cpufreq_quick_get(cpu) * 1000ul;
301 * If the backend cpufreq driver does not exist,
302 * then fallback to old way of reporting the clockrate.
305 ret_freq = ppc_proc_freq;
309 define_machine(powernv) {
312 .init_early = pnv_init_early,
313 .setup_arch = pnv_setup_arch,
314 .init_IRQ = pnv_init_IRQ,
315 .show_cpuinfo = pnv_show_cpuinfo,
316 .get_proc_freq = pnv_get_proc_freq,
317 .progress = pnv_progress,
318 .machine_shutdown = pnv_shutdown,
319 .power_save = power7_idle,
320 .calibrate_decr = generic_calibrate_decr,
322 .kexec_cpu_down = pnv_kexec_cpu_down,
324 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
325 .memory_block_size = pnv_memory_block_size,