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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> | |
2c2e6ecf | 29 | #include <linux/cpuidle.h> |
55190f88 BH |
30 | |
31 | #include <asm/machdep.h> | |
32 | #include <asm/firmware.h> | |
33 | #include <asm/xics.h> | |
628daa8d | 34 | #include <asm/rtas.h> |
daea1175 | 35 | #include <asm/opal.h> |
13906db6 | 36 | #include <asm/kexec.h> |
55190f88 BH |
37 | |
38 | #include "powernv.h" | |
39 | ||
40 | static void __init pnv_setup_arch(void) | |
41 | { | |
55190f88 BH |
42 | /* Initialize SMP */ |
43 | pnv_smp_init(); | |
44 | ||
61305a96 BH |
45 | /* Setup PCI */ |
46 | pnv_pci_init(); | |
55190f88 | 47 | |
628daa8d BH |
48 | /* Setup RTC and NVRAM callbacks */ |
49 | if (firmware_has_feature(FW_FEATURE_OPAL)) | |
50 | opal_nvram_init(); | |
55190f88 BH |
51 | |
52 | /* Enable NAP mode */ | |
53 | powersave_nap = 1; | |
54 | ||
55 | /* XXX PMCS */ | |
56 | } | |
57 | ||
58 | static void __init pnv_init_early(void) | |
59 | { | |
3fafe9c2 BH |
60 | /* |
61 | * Initialize the LPC bus now so that legacy serial | |
62 | * ports can be found on it | |
63 | */ | |
64 | opal_lpc_init(); | |
65 | ||
daea1175 BH |
66 | #ifdef CONFIG_HVC_OPAL |
67 | if (firmware_has_feature(FW_FEATURE_OPAL)) | |
68 | hvc_opal_init_early(); | |
69 | else | |
70 | #endif | |
71 | add_preferred_console("hvc", 0, NULL); | |
55190f88 BH |
72 | } |
73 | ||
74 | static void __init pnv_init_IRQ(void) | |
75 | { | |
76 | xics_init(); | |
77 | ||
78 | WARN_ON(!ppc_md.get_irq); | |
79 | } | |
80 | ||
81 | static void pnv_show_cpuinfo(struct seq_file *m) | |
82 | { | |
83 | struct device_node *root; | |
84 | const char *model = ""; | |
85 | ||
86 | root = of_find_node_by_path("/"); | |
87 | if (root) | |
88 | model = of_get_property(root, "model", NULL); | |
89 | seq_printf(m, "machine\t\t: PowerNV %s\n", model); | |
75b93da4 BH |
90 | if (firmware_has_feature(FW_FEATURE_OPALv3)) |
91 | seq_printf(m, "firmware\t: OPAL v3\n"); | |
92 | else if (firmware_has_feature(FW_FEATURE_OPALv2)) | |
14a43e69 BH |
93 | seq_printf(m, "firmware\t: OPAL v2\n"); |
94 | else if (firmware_has_feature(FW_FEATURE_OPAL)) | |
95 | seq_printf(m, "firmware\t: OPAL v1\n"); | |
96 | else | |
97 | seq_printf(m, "firmware\t: BML\n"); | |
55190f88 BH |
98 | of_node_put(root); |
99 | } | |
100 | ||
ec27329f | 101 | static void __noreturn pnv_restart(char *cmd) |
55190f88 | 102 | { |
ec27329f BH |
103 | long rc = OPAL_BUSY; |
104 | ||
e8e71fa4 GS |
105 | opal_notifier_disable(); |
106 | ||
ec27329f BH |
107 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { |
108 | rc = opal_cec_reboot(); | |
109 | if (rc == OPAL_BUSY_EVENT) | |
110 | opal_poll_events(NULL); | |
111 | else | |
112 | mdelay(10); | |
113 | } | |
114 | for (;;) | |
115 | opal_poll_events(NULL); | |
55190f88 BH |
116 | } |
117 | ||
ec27329f | 118 | static void __noreturn pnv_power_off(void) |
55190f88 | 119 | { |
ec27329f BH |
120 | long rc = OPAL_BUSY; |
121 | ||
e8e71fa4 GS |
122 | opal_notifier_disable(); |
123 | ||
ec27329f BH |
124 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { |
125 | rc = opal_cec_power_down(0); | |
126 | if (rc == OPAL_BUSY_EVENT) | |
127 | opal_poll_events(NULL); | |
128 | else | |
129 | mdelay(10); | |
130 | } | |
131 | for (;;) | |
132 | opal_poll_events(NULL); | |
55190f88 BH |
133 | } |
134 | ||
ec27329f | 135 | static void __noreturn pnv_halt(void) |
55190f88 | 136 | { |
ec27329f | 137 | pnv_power_off(); |
55190f88 BH |
138 | } |
139 | ||
628daa8d | 140 | static void pnv_progress(char *s, unsigned short hex) |
55190f88 BH |
141 | { |
142 | } | |
143 | ||
73ed148a BH |
144 | static void pnv_shutdown(void) |
145 | { | |
146 | /* Let the PCI code clear up IODA tables */ | |
147 | pnv_pci_shutdown(); | |
148 | ||
f7d98d18 VH |
149 | /* |
150 | * Stop OPAL activity: Unregister all OPAL interrupts so they | |
151 | * don't fire up while we kexec and make sure all potentially | |
152 | * DMA'ing ops are complete (such as dump retrieval). | |
73ed148a BH |
153 | */ |
154 | opal_shutdown(); | |
155 | } | |
156 | ||
628daa8d BH |
157 | #ifdef CONFIG_KEXEC |
158 | static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) | |
55190f88 | 159 | { |
628daa8d | 160 | xics_kexec_teardown_cpu(secondary); |
13906db6 BH |
161 | |
162 | /* Return secondary CPUs to firmware on OPAL v3 */ | |
163 | if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) { | |
164 | mb(); | |
165 | get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; | |
166 | mb(); | |
167 | ||
168 | /* Return the CPU to OPAL */ | |
169 | opal_return_cpu(); | |
170 | } | |
55190f88 | 171 | } |
628daa8d | 172 | #endif /* CONFIG_KEXEC */ |
55190f88 | 173 | |
628daa8d | 174 | static void __init pnv_setup_machdep_opal(void) |
55190f88 | 175 | { |
628daa8d BH |
176 | ppc_md.get_boot_time = opal_get_boot_time; |
177 | ppc_md.get_rtc_time = opal_get_rtc_time; | |
178 | ppc_md.set_rtc_time = opal_set_rtc_time; | |
179 | ppc_md.restart = pnv_restart; | |
180 | ppc_md.power_off = pnv_power_off; | |
181 | ppc_md.halt = pnv_halt; | |
ed79ba9e | 182 | ppc_md.machine_check_exception = opal_machine_check; |
55190f88 BH |
183 | } |
184 | ||
628daa8d BH |
185 | #ifdef CONFIG_PPC_POWERNV_RTAS |
186 | static void __init pnv_setup_machdep_rtas(void) | |
55190f88 | 187 | { |
628daa8d BH |
188 | if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { |
189 | ppc_md.get_boot_time = rtas_get_boot_time; | |
190 | ppc_md.get_rtc_time = rtas_get_rtc_time; | |
191 | ppc_md.set_rtc_time = rtas_set_rtc_time; | |
192 | } | |
193 | ppc_md.restart = rtas_restart; | |
194 | ppc_md.power_off = rtas_power_off; | |
195 | ppc_md.halt = rtas_halt; | |
55190f88 | 196 | } |
628daa8d | 197 | #endif /* CONFIG_PPC_POWERNV_RTAS */ |
55190f88 BH |
198 | |
199 | static int __init pnv_probe(void) | |
200 | { | |
201 | unsigned long root = of_get_flat_dt_root(); | |
202 | ||
203 | if (!of_flat_dt_is_compatible(root, "ibm,powernv")) | |
204 | return 0; | |
205 | ||
206 | hpte_init_native(); | |
207 | ||
628daa8d BH |
208 | if (firmware_has_feature(FW_FEATURE_OPAL)) |
209 | pnv_setup_machdep_opal(); | |
210 | #ifdef CONFIG_PPC_POWERNV_RTAS | |
211 | else if (rtas.base) | |
212 | pnv_setup_machdep_rtas(); | |
213 | #endif /* CONFIG_PPC_POWERNV_RTAS */ | |
214 | ||
55190f88 BH |
215 | pr_debug("PowerNV detected !\n"); |
216 | ||
217 | return 1; | |
218 | } | |
219 | ||
2c2e6ecf DD |
220 | void powernv_idle(void) |
221 | { | |
222 | /* Hook to cpuidle framework if available, else | |
223 | * call on default platform idle code | |
224 | */ | |
225 | if (cpuidle_idle_call()) { | |
226 | power7_idle(); | |
227 | } | |
228 | } | |
229 | ||
55190f88 BH |
230 | define_machine(powernv) { |
231 | .name = "PowerNV", | |
232 | .probe = pnv_probe, | |
55190f88 | 233 | .init_early = pnv_init_early, |
628daa8d | 234 | .setup_arch = pnv_setup_arch, |
55190f88 BH |
235 | .init_IRQ = pnv_init_IRQ, |
236 | .show_cpuinfo = pnv_show_cpuinfo, | |
55190f88 | 237 | .progress = pnv_progress, |
73ed148a | 238 | .machine_shutdown = pnv_shutdown, |
2c2e6ecf | 239 | .power_save = powernv_idle, |
55190f88 BH |
240 | .calibrate_decr = generic_calibrate_decr, |
241 | #ifdef CONFIG_KEXEC | |
242 | .kexec_cpu_down = pnv_kexec_cpu_down, | |
243 | #endif | |
244 | }; |