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>
41 static void __init
pnv_setup_arch(void)
49 /* Setup RTC and NVRAM callbacks */
50 if (firmware_has_feature(FW_FEATURE_OPAL
))
59 static void __init
pnv_init_early(void)
62 * Initialize the LPC bus now so that legacy serial
63 * ports can be found on it
67 #ifdef CONFIG_HVC_OPAL
68 if (firmware_has_feature(FW_FEATURE_OPAL
))
69 hvc_opal_init_early();
72 add_preferred_console("hvc", 0, NULL
);
75 static void __init
pnv_init_IRQ(void)
79 WARN_ON(!ppc_md
.get_irq
);
82 static void pnv_show_cpuinfo(struct seq_file
*m
)
84 struct device_node
*root
;
85 const char *model
= "";
87 root
= of_find_node_by_path("/");
89 model
= of_get_property(root
, "model", NULL
);
90 seq_printf(m
, "machine\t\t: PowerNV %s\n", model
);
91 if (firmware_has_feature(FW_FEATURE_OPALv3
))
92 seq_printf(m
, "firmware\t: OPAL v3\n");
93 else if (firmware_has_feature(FW_FEATURE_OPALv2
))
94 seq_printf(m
, "firmware\t: OPAL v2\n");
95 else if (firmware_has_feature(FW_FEATURE_OPAL
))
96 seq_printf(m
, "firmware\t: OPAL v1\n");
98 seq_printf(m
, "firmware\t: BML\n");
102 static void pnv_prepare_going_down(void)
105 * Disable all notifiers from OPAL, we can't
106 * service interrupts anymore anyway
108 opal_notifier_disable();
110 /* Soft disable interrupts */
114 * Return secondary CPUs to firwmare if a flash update
115 * is pending otherwise we will get all sort of error
116 * messages about CPU being stuck etc.. This will also
117 * have the side effect of hard disabling interrupts so
118 * past this point, the kernel is effectively dead.
120 opal_flash_term_callback();
123 static void __noreturn
pnv_restart(char *cmd
)
127 pnv_prepare_going_down();
129 while (rc
== OPAL_BUSY
|| rc
== OPAL_BUSY_EVENT
) {
130 rc
= opal_cec_reboot();
131 if (rc
== OPAL_BUSY_EVENT
)
132 opal_poll_events(NULL
);
137 opal_poll_events(NULL
);
140 static void __noreturn
pnv_power_off(void)
144 pnv_prepare_going_down();
146 while (rc
== OPAL_BUSY
|| rc
== OPAL_BUSY_EVENT
) {
147 rc
= opal_cec_power_down(0);
148 if (rc
== OPAL_BUSY_EVENT
)
149 opal_poll_events(NULL
);
154 opal_poll_events(NULL
);
157 static void __noreturn
pnv_halt(void)
162 static void pnv_progress(char *s
, unsigned short hex
)
166 static int pnv_dma_set_mask(struct device
*dev
, u64 dma_mask
)
169 return pnv_pci_dma_set_mask(to_pci_dev(dev
), dma_mask
);
170 return __dma_set_mask(dev
, dma_mask
);
173 static void pnv_shutdown(void)
175 /* Let the PCI code clear up IODA tables */
179 * Stop OPAL activity: Unregister all OPAL interrupts so they
180 * don't fire up while we kexec and make sure all potentially
181 * DMA'ing ops are complete (such as dump retrieval).
187 static void pnv_kexec_wait_secondaries_down(void)
189 int my_cpu
, i
, notified
= -1;
193 for_each_online_cpu(i
) {
201 rc
= opal_query_cpu_status(get_hard_smp_processor_id(i
),
203 if (rc
!= OPAL_SUCCESS
|| status
!= OPAL_THREAD_STARTED
)
207 printk(KERN_INFO
"kexec: waiting for cpu %d "
208 "(physical %d) to enter OPAL\n",
209 i
, paca
[i
].hw_cpu_id
);
216 static void pnv_kexec_cpu_down(int crash_shutdown
, int secondary
)
218 xics_kexec_teardown_cpu(secondary
);
220 /* On OPAL v3, we return all CPUs to firmware */
222 if (!firmware_has_feature(FW_FEATURE_OPALv3
))
226 /* Return secondary CPUs to firmware on OPAL v3 */
228 get_paca()->kexec_state
= KEXEC_STATE_REAL_MODE
;
231 /* Return the CPU to OPAL */
233 } else if (crash_shutdown
) {
235 * On crash, we don't wait for secondaries to go
236 * down as they might be unreachable or hung, so
237 * instead we just wait a bit and move on.
241 /* Primary waits for the secondaries to have reached OPAL */
242 pnv_kexec_wait_secondaries_down();
245 #endif /* CONFIG_KEXEC */
247 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
248 static unsigned long pnv_memory_block_size(void)
250 return 256UL * 1024 * 1024;
254 static void __init
pnv_setup_machdep_opal(void)
256 ppc_md
.get_boot_time
= opal_get_boot_time
;
257 ppc_md
.get_rtc_time
= opal_get_rtc_time
;
258 ppc_md
.set_rtc_time
= opal_set_rtc_time
;
259 ppc_md
.restart
= pnv_restart
;
260 ppc_md
.power_off
= pnv_power_off
;
261 ppc_md
.halt
= pnv_halt
;
262 ppc_md
.machine_check_exception
= opal_machine_check
;
263 ppc_md
.mce_check_early_recovery
= opal_mce_check_early_recovery
;
266 #ifdef CONFIG_PPC_POWERNV_RTAS
267 static void __init
pnv_setup_machdep_rtas(void)
269 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE
) {
270 ppc_md
.get_boot_time
= rtas_get_boot_time
;
271 ppc_md
.get_rtc_time
= rtas_get_rtc_time
;
272 ppc_md
.set_rtc_time
= rtas_set_rtc_time
;
274 ppc_md
.restart
= rtas_restart
;
275 ppc_md
.power_off
= rtas_power_off
;
276 ppc_md
.halt
= rtas_halt
;
278 #endif /* CONFIG_PPC_POWERNV_RTAS */
280 static int __init
pnv_probe(void)
282 unsigned long root
= of_get_flat_dt_root();
284 if (!of_flat_dt_is_compatible(root
, "ibm,powernv"))
289 if (firmware_has_feature(FW_FEATURE_OPAL
))
290 pnv_setup_machdep_opal();
291 #ifdef CONFIG_PPC_POWERNV_RTAS
293 pnv_setup_machdep_rtas();
294 #endif /* CONFIG_PPC_POWERNV_RTAS */
296 pr_debug("PowerNV detected !\n");
302 * Returns the cpu frequency for 'cpu' in Hz. This is used by
305 unsigned long pnv_get_proc_freq(unsigned int cpu
)
307 unsigned long ret_freq
;
309 ret_freq
= cpufreq_quick_get(cpu
) * 1000ul;
312 * If the backend cpufreq driver does not exist,
313 * then fallback to old way of reporting the clockrate.
316 ret_freq
= ppc_proc_freq
;
320 define_machine(powernv
) {
323 .init_early
= pnv_init_early
,
324 .setup_arch
= pnv_setup_arch
,
325 .init_IRQ
= pnv_init_IRQ
,
326 .show_cpuinfo
= pnv_show_cpuinfo
,
327 .get_proc_freq
= pnv_get_proc_freq
,
328 .progress
= pnv_progress
,
329 .machine_shutdown
= pnv_shutdown
,
330 .power_save
= power7_idle
,
331 .calibrate_decr
= generic_calibrate_decr
,
332 .dma_set_mask
= pnv_dma_set_mask
,
334 .kexec_cpu_down
= pnv_kexec_cpu_down
,
336 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
337 .memory_block_size
= pnv_memory_block_size
,