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>
37 #include <asm/kexec.h>
43 static void __init
pnv_setup_arch(void)
45 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT
);
53 /* Setup RTC and NVRAM callbacks */
54 if (firmware_has_feature(FW_FEATURE_OPAL
))
63 static void __init
pnv_init(void)
66 * Initialize the LPC bus now so that legacy serial
67 * ports can be found on it
71 #ifdef CONFIG_HVC_OPAL
72 if (firmware_has_feature(FW_FEATURE_OPAL
))
73 hvc_opal_init_early();
76 add_preferred_console("hvc", 0, NULL
);
79 static void __init
pnv_init_IRQ(void)
81 /* Try using a XIVE if available, otherwise use a XICS */
82 if (!xive_native_init())
85 WARN_ON(!ppc_md
.get_irq
);
88 static void pnv_show_cpuinfo(struct seq_file
*m
)
90 struct device_node
*root
;
91 const char *model
= "";
93 root
= of_find_node_by_path("/");
95 model
= of_get_property(root
, "model", NULL
);
96 seq_printf(m
, "machine\t\t: PowerNV %s\n", model
);
97 if (firmware_has_feature(FW_FEATURE_OPAL
))
98 seq_printf(m
, "firmware\t: OPAL\n");
100 seq_printf(m
, "firmware\t: BML\n");
103 seq_printf(m
, "MMU\t\t: Radix\n");
105 seq_printf(m
, "MMU\t\t: Hash\n");
108 static void pnv_prepare_going_down(void)
111 * Disable all notifiers from OPAL, we can't
112 * service interrupts anymore anyway
114 opal_event_shutdown();
116 /* Soft disable interrupts */
120 * Return secondary CPUs to firwmare if a flash update
121 * is pending otherwise we will get all sort of error
122 * messages about CPU being stuck etc.. This will also
123 * have the side effect of hard disabling interrupts so
124 * past this point, the kernel is effectively dead.
126 opal_flash_term_callback();
129 static void __noreturn
pnv_restart(char *cmd
)
133 pnv_prepare_going_down();
135 while (rc
== OPAL_BUSY
|| rc
== OPAL_BUSY_EVENT
) {
136 rc
= opal_cec_reboot();
137 if (rc
== OPAL_BUSY_EVENT
)
138 opal_poll_events(NULL
);
143 opal_poll_events(NULL
);
146 static void __noreturn
pnv_power_off(void)
150 pnv_prepare_going_down();
152 while (rc
== OPAL_BUSY
|| rc
== OPAL_BUSY_EVENT
) {
153 rc
= opal_cec_power_down(0);
154 if (rc
== OPAL_BUSY_EVENT
)
155 opal_poll_events(NULL
);
160 opal_poll_events(NULL
);
163 static void __noreturn
pnv_halt(void)
168 static void pnv_progress(char *s
, unsigned short hex
)
172 static void pnv_shutdown(void)
174 /* Let the PCI code clear up IODA tables */
178 * Stop OPAL activity: Unregister all OPAL interrupts so they
179 * don't fire up while we kexec and make sure all potentially
180 * DMA'ing ops are complete (such as dump retrieval).
185 #ifdef CONFIG_KEXEC_CORE
186 static void pnv_kexec_wait_secondaries_down(void)
188 int my_cpu
, i
, notified
= -1;
192 for_each_online_cpu(i
) {
194 int64_t rc
, timeout
= 1000;
200 rc
= opal_query_cpu_status(get_hard_smp_processor_id(i
),
202 if (rc
!= OPAL_SUCCESS
|| status
!= OPAL_THREAD_STARTED
)
206 printk(KERN_INFO
"kexec: waiting for cpu %d "
207 "(physical %d) to enter OPAL\n",
208 i
, paca
[i
].hw_cpu_id
);
213 * On crash secondaries might be unreachable or hung,
214 * so timeout if we've waited too long
217 if (timeout
-- == 0) {
218 printk(KERN_ERR
"kexec: timed out waiting for "
219 "cpu %d (physical %d) to enter OPAL\n",
220 i
, paca
[i
].hw_cpu_id
);
227 static void pnv_kexec_cpu_down(int crash_shutdown
, int secondary
)
232 xive_kexec_teardown_cpu(secondary
);
234 xics_kexec_teardown_cpu(secondary
);
236 /* On OPAL, we return all CPUs to firmware */
237 if (!firmware_has_feature(FW_FEATURE_OPAL
))
241 /* Return secondary CPUs to firmware on OPAL v3 */
243 get_paca()->kexec_state
= KEXEC_STATE_REAL_MODE
;
246 /* Return the CPU to OPAL */
249 /* Primary waits for the secondaries to have reached OPAL */
250 pnv_kexec_wait_secondaries_down();
252 /* Switch XIVE back to emulation mode */
257 * We might be running as little-endian - now that interrupts
258 * are disabled, reset the HILE bit to big-endian so we don't
259 * take interrupts in the wrong endian later
261 * We reinit to enable both radix and hash on P9 to ensure
262 * the mode used by the next kernel is always supported.
264 reinit_flags
= OPAL_REINIT_CPUS_HILE_BE
;
265 if (cpu_has_feature(CPU_FTR_ARCH_300
))
266 reinit_flags
|= OPAL_REINIT_CPUS_MMU_RADIX
|
267 OPAL_REINIT_CPUS_MMU_HASH
;
268 opal_reinit_cpus(reinit_flags
);
271 #endif /* CONFIG_KEXEC_CORE */
273 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
274 static unsigned long pnv_memory_block_size(void)
276 return 256UL * 1024 * 1024;
280 static void __init
pnv_setup_machdep_opal(void)
282 ppc_md
.get_boot_time
= opal_get_boot_time
;
283 ppc_md
.restart
= pnv_restart
;
284 pm_power_off
= pnv_power_off
;
285 ppc_md
.halt
= pnv_halt
;
286 /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
287 ppc_md
.machine_check_exception
= opal_machine_check
;
288 ppc_md
.mce_check_early_recovery
= opal_mce_check_early_recovery
;
289 ppc_md
.hmi_exception_early
= opal_hmi_exception_early
;
290 ppc_md
.handle_hmi_exception
= opal_handle_hmi_exception
;
293 static int __init
pnv_probe(void)
295 if (!of_machine_is_compatible("ibm,powernv"))
298 if (firmware_has_feature(FW_FEATURE_OPAL
))
299 pnv_setup_machdep_opal();
301 pr_debug("PowerNV detected !\n");
308 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
309 void __init
pnv_tm_init(void)
311 if (!firmware_has_feature(FW_FEATURE_OPAL
) ||
312 !pvr_version_is(PVR_POWER9
) ||
313 early_cpu_has_feature(CPU_FTR_TM
))
316 if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED
) != OPAL_SUCCESS
)
319 pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
320 cur_cpu_spec
->cpu_features
|= CPU_FTR_TM
;
321 /* Make sure "normal" HTM is off (it should be) */
322 cur_cpu_spec
->cpu_user_features2
&= ~PPC_FEATURE2_HTM
;
323 /* Turn on no suspend mode, and HTM no SC */
324 cur_cpu_spec
->cpu_user_features2
|= PPC_FEATURE2_HTM_NO_SUSPEND
| \
325 PPC_FEATURE2_HTM_NOSC
;
326 tm_suspend_disabled
= true;
328 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
331 * Returns the cpu frequency for 'cpu' in Hz. This is used by
334 static unsigned long pnv_get_proc_freq(unsigned int cpu
)
336 unsigned long ret_freq
;
338 ret_freq
= cpufreq_quick_get(cpu
) * 1000ul;
341 * If the backend cpufreq driver does not exist,
342 * then fallback to old way of reporting the clockrate.
345 ret_freq
= ppc_proc_freq
;
349 define_machine(powernv
) {
352 .setup_arch
= pnv_setup_arch
,
353 .init_IRQ
= pnv_init_IRQ
,
354 .show_cpuinfo
= pnv_show_cpuinfo
,
355 .get_proc_freq
= pnv_get_proc_freq
,
356 .progress
= pnv_progress
,
357 .machine_shutdown
= pnv_shutdown
,
359 .calibrate_decr
= generic_calibrate_decr
,
360 #ifdef CONFIG_KEXEC_CORE
361 .kexec_cpu_down
= pnv_kexec_cpu_down
,
363 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
364 .memory_block_size
= pnv_memory_block_size
,