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55190f88 BH |
1 | /* |
2 | * PowerNV setup code. | |
3 | * | |
4 | * Copyright 2011 IBM Corp. | |
5 | * | |
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. | |
10 | */ | |
11 | ||
12 | #undef DEBUG | |
13 | ||
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> | |
25 | #include <linux/of.h> | |
26a2056e | 26 | #include <linux/of_fdt.h> |
55190f88 BH |
27 | #include <linux/interrupt.h> |
28 | #include <linux/bug.h> | |
cd15b048 | 29 | #include <linux/pci.h> |
fb5153d0 | 30 | #include <linux/cpufreq.h> |
55190f88 BH |
31 | |
32 | #include <asm/machdep.h> | |
33 | #include <asm/firmware.h> | |
34 | #include <asm/xics.h> | |
daea1175 | 35 | #include <asm/opal.h> |
13906db6 | 36 | #include <asm/kexec.h> |
b2a80878 | 37 | #include <asm/smp.h> |
55190f88 BH |
38 | |
39 | #include "powernv.h" | |
40 | ||
41 | static void __init pnv_setup_arch(void) | |
42 | { | |
4817fc32 AB |
43 | set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); |
44 | ||
55190f88 BH |
45 | /* Initialize SMP */ |
46 | pnv_smp_init(); | |
47 | ||
61305a96 BH |
48 | /* Setup PCI */ |
49 | pnv_pci_init(); | |
55190f88 | 50 | |
628daa8d BH |
51 | /* Setup RTC and NVRAM callbacks */ |
52 | if (firmware_has_feature(FW_FEATURE_OPAL)) | |
53 | opal_nvram_init(); | |
55190f88 BH |
54 | |
55 | /* Enable NAP mode */ | |
56 | powersave_nap = 1; | |
57 | ||
58 | /* XXX PMCS */ | |
59 | } | |
60 | ||
f2d57694 | 61 | static void __init pnv_init(void) |
55190f88 | 62 | { |
3fafe9c2 BH |
63 | /* |
64 | * Initialize the LPC bus now so that legacy serial | |
65 | * ports can be found on it | |
66 | */ | |
67 | opal_lpc_init(); | |
68 | ||
daea1175 BH |
69 | #ifdef CONFIG_HVC_OPAL |
70 | if (firmware_has_feature(FW_FEATURE_OPAL)) | |
71 | hvc_opal_init_early(); | |
72 | else | |
73 | #endif | |
74 | add_preferred_console("hvc", 0, NULL); | |
55190f88 BH |
75 | } |
76 | ||
77 | static void __init pnv_init_IRQ(void) | |
78 | { | |
79 | xics_init(); | |
80 | ||
81 | WARN_ON(!ppc_md.get_irq); | |
82 | } | |
83 | ||
84 | static void pnv_show_cpuinfo(struct seq_file *m) | |
85 | { | |
86 | struct device_node *root; | |
87 | const char *model = ""; | |
88 | ||
89 | root = of_find_node_by_path("/"); | |
90 | if (root) | |
91 | model = of_get_property(root, "model", NULL); | |
92 | seq_printf(m, "machine\t\t: PowerNV %s\n", model); | |
e4d54f71 SS |
93 | if (firmware_has_feature(FW_FEATURE_OPAL)) |
94 | seq_printf(m, "firmware\t: OPAL\n"); | |
14a43e69 BH |
95 | else |
96 | seq_printf(m, "firmware\t: BML\n"); | |
55190f88 BH |
97 | of_node_put(root); |
98 | } | |
99 | ||
2196c6f1 VH |
100 | static void pnv_prepare_going_down(void) |
101 | { | |
102 | /* | |
103 | * Disable all notifiers from OPAL, we can't | |
104 | * service interrupts anymore anyway | |
105 | */ | |
81f2f7ce | 106 | opal_event_shutdown(); |
2196c6f1 VH |
107 | |
108 | /* Soft disable interrupts */ | |
109 | local_irq_disable(); | |
110 | ||
111 | /* | |
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. | |
117 | */ | |
118 | opal_flash_term_callback(); | |
119 | } | |
120 | ||
ec27329f | 121 | static void __noreturn pnv_restart(char *cmd) |
55190f88 | 122 | { |
ec27329f BH |
123 | long rc = OPAL_BUSY; |
124 | ||
2196c6f1 | 125 | pnv_prepare_going_down(); |
e8e71fa4 | 126 | |
ec27329f BH |
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); | |
131 | else | |
132 | mdelay(10); | |
133 | } | |
134 | for (;;) | |
135 | opal_poll_events(NULL); | |
55190f88 BH |
136 | } |
137 | ||
ec27329f | 138 | static void __noreturn pnv_power_off(void) |
55190f88 | 139 | { |
ec27329f BH |
140 | long rc = OPAL_BUSY; |
141 | ||
2196c6f1 | 142 | pnv_prepare_going_down(); |
e8e71fa4 | 143 | |
ec27329f BH |
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); | |
148 | else | |
149 | mdelay(10); | |
150 | } | |
151 | for (;;) | |
152 | opal_poll_events(NULL); | |
55190f88 BH |
153 | } |
154 | ||
ec27329f | 155 | static void __noreturn pnv_halt(void) |
55190f88 | 156 | { |
ec27329f | 157 | pnv_power_off(); |
55190f88 BH |
158 | } |
159 | ||
628daa8d | 160 | static void pnv_progress(char *s, unsigned short hex) |
55190f88 BH |
161 | { |
162 | } | |
163 | ||
73ed148a BH |
164 | static void pnv_shutdown(void) |
165 | { | |
166 | /* Let the PCI code clear up IODA tables */ | |
167 | pnv_pci_shutdown(); | |
168 | ||
f7d98d18 VH |
169 | /* |
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). | |
73ed148a BH |
173 | */ |
174 | opal_shutdown(); | |
175 | } | |
176 | ||
628daa8d | 177 | #ifdef CONFIG_KEXEC |
298b34d7 BH |
178 | static void pnv_kexec_wait_secondaries_down(void) |
179 | { | |
180 | int my_cpu, i, notified = -1; | |
181 | ||
182 | my_cpu = get_cpu(); | |
183 | ||
184 | for_each_online_cpu(i) { | |
185 | uint8_t status; | |
1b70386c | 186 | int64_t rc, timeout = 1000; |
298b34d7 BH |
187 | |
188 | if (i == my_cpu) | |
189 | continue; | |
190 | ||
191 | for (;;) { | |
192 | rc = opal_query_cpu_status(get_hard_smp_processor_id(i), | |
193 | &status); | |
194 | if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED) | |
195 | break; | |
196 | barrier(); | |
197 | if (i != notified) { | |
198 | printk(KERN_INFO "kexec: waiting for cpu %d " | |
199 | "(physical %d) to enter OPAL\n", | |
200 | i, paca[i].hw_cpu_id); | |
201 | notified = i; | |
202 | } | |
1b70386c SMJ |
203 | |
204 | /* | |
205 | * On crash secondaries might be unreachable or hung, | |
206 | * so timeout if we've waited too long | |
207 | * */ | |
208 | mdelay(1); | |
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); | |
213 | break; | |
214 | } | |
298b34d7 BH |
215 | } |
216 | } | |
217 | } | |
218 | ||
628daa8d | 219 | static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) |
55190f88 | 220 | { |
628daa8d | 221 | xics_kexec_teardown_cpu(secondary); |
13906db6 | 222 | |
e4d54f71 | 223 | /* On OPAL, we return all CPUs to firmware */ |
298b34d7 | 224 | |
e4d54f71 | 225 | if (!firmware_has_feature(FW_FEATURE_OPAL)) |
298b34d7 BH |
226 | return; |
227 | ||
228 | if (secondary) { | |
229 | /* Return secondary CPUs to firmware on OPAL v3 */ | |
13906db6 BH |
230 | mb(); |
231 | get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; | |
232 | mb(); | |
233 | ||
234 | /* Return the CPU to OPAL */ | |
235 | opal_return_cpu(); | |
298b34d7 BH |
236 | } else { |
237 | /* Primary waits for the secondaries to have reached OPAL */ | |
238 | pnv_kexec_wait_secondaries_down(); | |
e72bb8a5 SMJ |
239 | |
240 | /* | |
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 | |
244 | */ | |
245 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); | |
13906db6 | 246 | } |
55190f88 | 247 | } |
628daa8d | 248 | #endif /* CONFIG_KEXEC */ |
55190f88 | 249 | |
6d97d7a2 AB |
250 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
251 | static unsigned long pnv_memory_block_size(void) | |
252 | { | |
253 | return 256UL * 1024 * 1024; | |
254 | } | |
255 | #endif | |
256 | ||
628daa8d | 257 | static void __init pnv_setup_machdep_opal(void) |
55190f88 | 258 | { |
628daa8d | 259 | ppc_md.get_boot_time = opal_get_boot_time; |
628daa8d | 260 | ppc_md.restart = pnv_restart; |
9178ba29 | 261 | pm_power_off = pnv_power_off; |
628daa8d | 262 | ppc_md.halt = pnv_halt; |
ed79ba9e | 263 | ppc_md.machine_check_exception = opal_machine_check; |
55672ecf | 264 | ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery; |
0869b6fd MS |
265 | ppc_md.hmi_exception_early = opal_hmi_exception_early; |
266 | ppc_md.handle_hmi_exception = opal_handle_hmi_exception; | |
55190f88 BH |
267 | } |
268 | ||
55190f88 BH |
269 | static int __init pnv_probe(void) |
270 | { | |
406b0b6a | 271 | if (!of_machine_is_compatible("ibm,powernv")) |
55190f88 BH |
272 | return 0; |
273 | ||
628daa8d BH |
274 | if (firmware_has_feature(FW_FEATURE_OPAL)) |
275 | pnv_setup_machdep_opal(); | |
628daa8d | 276 | |
55190f88 BH |
277 | pr_debug("PowerNV detected !\n"); |
278 | ||
f2d57694 BH |
279 | pnv_init(); |
280 | ||
55190f88 BH |
281 | return 1; |
282 | } | |
283 | ||
fb5153d0 GS |
284 | /* |
285 | * Returns the cpu frequency for 'cpu' in Hz. This is used by | |
286 | * /proc/cpuinfo | |
287 | */ | |
e51df2c1 | 288 | static unsigned long pnv_get_proc_freq(unsigned int cpu) |
fb5153d0 GS |
289 | { |
290 | unsigned long ret_freq; | |
291 | ||
292 | ret_freq = cpufreq_quick_get(cpu) * 1000ul; | |
293 | ||
294 | /* | |
295 | * If the backend cpufreq driver does not exist, | |
296 | * then fallback to old way of reporting the clockrate. | |
297 | */ | |
298 | if (!ret_freq) | |
299 | ret_freq = ppc_proc_freq; | |
300 | return ret_freq; | |
301 | } | |
302 | ||
55190f88 BH |
303 | define_machine(powernv) { |
304 | .name = "PowerNV", | |
305 | .probe = pnv_probe, | |
628daa8d | 306 | .setup_arch = pnv_setup_arch, |
55190f88 BH |
307 | .init_IRQ = pnv_init_IRQ, |
308 | .show_cpuinfo = pnv_show_cpuinfo, | |
fb5153d0 | 309 | .get_proc_freq = pnv_get_proc_freq, |
55190f88 | 310 | .progress = pnv_progress, |
73ed148a | 311 | .machine_shutdown = pnv_shutdown, |
5593e303 | 312 | .power_save = NULL, |
55190f88 BH |
313 | .calibrate_decr = generic_calibrate_decr, |
314 | #ifdef CONFIG_KEXEC | |
315 | .kexec_cpu_down = pnv_kexec_cpu_down, | |
316 | #endif | |
6d97d7a2 AB |
317 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
318 | .memory_block_size = pnv_memory_block_size, | |
319 | #endif | |
55190f88 | 320 | }; |