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(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_OPAL))
94 seq_printf(m, "firmware\t: OPAL\n");
96 seq_printf(m, "firmware\t: BML\n");
100 static void pnv_prepare_going_down(void)
103 * Disable all notifiers from OPAL, we can't
104 * service interrupts anymore anyway
106 opal_event_shutdown();
108 /* Soft disable interrupts */
112 * Return secondary CPUs to firwmare if a flash update
113 * is pending otherwise we will get all sort of error
114 * messages about CPU being stuck etc.. This will also
115 * have the side effect of hard disabling interrupts so
116 * past this point, the kernel is effectively dead.
118 opal_flash_term_callback();
121 static void __noreturn pnv_restart(char *cmd)
125 pnv_prepare_going_down();
127 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
128 rc = opal_cec_reboot();
129 if (rc == OPAL_BUSY_EVENT)
130 opal_poll_events(NULL);
135 opal_poll_events(NULL);
138 static void __noreturn pnv_power_off(void)
142 pnv_prepare_going_down();
144 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
145 rc = opal_cec_power_down(0);
146 if (rc == OPAL_BUSY_EVENT)
147 opal_poll_events(NULL);
152 opal_poll_events(NULL);
155 static void __noreturn pnv_halt(void)
160 static void pnv_progress(char *s, unsigned short hex)
164 static void pnv_shutdown(void)
166 /* Let the PCI code clear up IODA tables */
170 * Stop OPAL activity: Unregister all OPAL interrupts so they
171 * don't fire up while we kexec and make sure all potentially
172 * DMA'ing ops are complete (such as dump retrieval).
177 #ifdef CONFIG_KEXEC_CORE
178 static void pnv_kexec_wait_secondaries_down(void)
180 int my_cpu, i, notified = -1;
184 for_each_online_cpu(i) {
186 int64_t rc, timeout = 1000;
192 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
194 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
198 printk(KERN_INFO "kexec: waiting for cpu %d "
199 "(physical %d) to enter OPAL\n",
200 i, paca[i].hw_cpu_id);
205 * On crash secondaries might be unreachable or hung,
206 * so timeout if we've waited too long
209 if (timeout-- == 0) {
210 printk(KERN_ERR "kexec: timed out waiting for "
211 "cpu %d (physical %d) to enter OPAL\n",
212 i, paca[i].hw_cpu_id);
219 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
221 xics_kexec_teardown_cpu(secondary);
223 /* On OPAL, we return all CPUs to firmware */
225 if (!firmware_has_feature(FW_FEATURE_OPAL))
229 /* Return secondary CPUs to firmware on OPAL v3 */
231 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
234 /* Return the CPU to OPAL */
237 /* Primary waits for the secondaries to have reached OPAL */
238 pnv_kexec_wait_secondaries_down();
241 * We might be running as little-endian - now that interrupts
242 * are disabled, reset the HILE bit to big-endian so we don't
243 * take interrupts in the wrong endian later
245 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
248 #endif /* CONFIG_KEXEC_CORE */
250 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
251 static unsigned long pnv_memory_block_size(void)
253 return 256UL * 1024 * 1024;
257 static void __init pnv_setup_machdep_opal(void)
259 ppc_md.get_boot_time = opal_get_boot_time;
260 ppc_md.restart = pnv_restart;
261 pm_power_off = pnv_power_off;
262 ppc_md.halt = pnv_halt;
263 ppc_md.machine_check_exception = opal_machine_check;
264 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
265 ppc_md.hmi_exception_early = opal_hmi_exception_early;
266 ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
269 static int __init pnv_probe(void)
271 if (!of_machine_is_compatible("ibm,powernv"))
274 if (firmware_has_feature(FW_FEATURE_OPAL))
275 pnv_setup_machdep_opal();
277 pr_debug("PowerNV detected !\n");
285 * Returns the cpu frequency for 'cpu' in Hz. This is used by
288 static unsigned long pnv_get_proc_freq(unsigned int cpu)
290 unsigned long ret_freq;
292 ret_freq = cpufreq_quick_get(cpu) * 1000ul;
295 * If the backend cpufreq driver does not exist,
296 * then fallback to old way of reporting the clockrate.
299 ret_freq = ppc_proc_freq;
303 define_machine(powernv) {
306 .setup_arch = pnv_setup_arch,
307 .init_IRQ = pnv_init_IRQ,
308 .show_cpuinfo = pnv_show_cpuinfo,
309 .get_proc_freq = pnv_get_proc_freq,
310 .progress = pnv_progress,
311 .machine_shutdown = pnv_shutdown,
313 .calibrate_decr = generic_calibrate_decr,
314 #ifdef CONFIG_KEXEC_CORE
315 .kexec_cpu_down = pnv_kexec_cpu_down,
317 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
318 .memory_block_size = pnv_memory_block_size,