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>
31 #include <asm/machdep.h>
32 #include <asm/firmware.h>
36 #include <asm/kexec.h>
40 static void __init pnv_setup_arch(void)
48 /* Setup RTC and NVRAM callbacks */
49 if (firmware_has_feature(FW_FEATURE_OPAL))
58 static void __init pnv_init_early(void)
61 * Initialize the LPC bus now so that legacy serial
62 * ports can be found on it
66 #ifdef CONFIG_HVC_OPAL
67 if (firmware_has_feature(FW_FEATURE_OPAL))
68 hvc_opal_init_early();
71 add_preferred_console("hvc", 0, NULL);
74 static void __init pnv_init_IRQ(void)
78 WARN_ON(!ppc_md.get_irq);
81 static void pnv_show_cpuinfo(struct seq_file *m)
83 struct device_node *root;
84 const char *model = "";
86 root = of_find_node_by_path("/");
88 model = of_get_property(root, "model", NULL);
89 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
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))
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");
97 seq_printf(m, "firmware\t: BML\n");
101 static void __noreturn pnv_restart(char *cmd)
105 opal_notifier_disable();
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);
115 opal_poll_events(NULL);
118 static void __noreturn pnv_power_off(void)
122 opal_notifier_disable();
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);
132 opal_poll_events(NULL);
135 static void __noreturn pnv_halt(void)
140 static void pnv_progress(char *s, unsigned short hex)
144 static int pnv_dma_set_mask(struct device *dev, u64 dma_mask)
147 return pnv_pci_dma_set_mask(to_pci_dev(dev), dma_mask);
148 return __dma_set_mask(dev, dma_mask);
151 static void pnv_shutdown(void)
153 /* Let the PCI code clear up IODA tables */
157 * Stop OPAL activity: Unregister all OPAL interrupts so they
158 * don't fire up while we kexec and make sure all potentially
159 * DMA'ing ops are complete (such as dump retrieval).
165 static void pnv_kexec_wait_secondaries_down(void)
167 int my_cpu, i, notified = -1;
171 for_each_online_cpu(i) {
179 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
181 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
185 printk(KERN_INFO "kexec: waiting for cpu %d "
186 "(physical %d) to enter OPAL\n",
187 i, paca[i].hw_cpu_id);
194 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
196 xics_kexec_teardown_cpu(secondary);
198 /* On OPAL v3, we return all CPUs to firmware */
200 if (!firmware_has_feature(FW_FEATURE_OPALv3))
204 /* Return secondary CPUs to firmware on OPAL v3 */
206 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
209 /* Return the CPU to OPAL */
211 } else if (crash_shutdown) {
213 * On crash, we don't wait for secondaries to go
214 * down as they might be unreachable or hung, so
215 * instead we just wait a bit and move on.
219 /* Primary waits for the secondaries to have reached OPAL */
220 pnv_kexec_wait_secondaries_down();
223 #endif /* CONFIG_KEXEC */
225 static void __init pnv_setup_machdep_opal(void)
227 ppc_md.get_boot_time = opal_get_boot_time;
228 ppc_md.get_rtc_time = opal_get_rtc_time;
229 ppc_md.set_rtc_time = opal_set_rtc_time;
230 ppc_md.restart = pnv_restart;
231 ppc_md.power_off = pnv_power_off;
232 ppc_md.halt = pnv_halt;
233 ppc_md.machine_check_exception = opal_machine_check;
234 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
237 #ifdef CONFIG_PPC_POWERNV_RTAS
238 static void __init pnv_setup_machdep_rtas(void)
240 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
241 ppc_md.get_boot_time = rtas_get_boot_time;
242 ppc_md.get_rtc_time = rtas_get_rtc_time;
243 ppc_md.set_rtc_time = rtas_set_rtc_time;
245 ppc_md.restart = rtas_restart;
246 ppc_md.power_off = rtas_power_off;
247 ppc_md.halt = rtas_halt;
249 #endif /* CONFIG_PPC_POWERNV_RTAS */
251 static int __init pnv_probe(void)
253 unsigned long root = of_get_flat_dt_root();
255 if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
260 if (firmware_has_feature(FW_FEATURE_OPAL))
261 pnv_setup_machdep_opal();
262 #ifdef CONFIG_PPC_POWERNV_RTAS
264 pnv_setup_machdep_rtas();
265 #endif /* CONFIG_PPC_POWERNV_RTAS */
267 pr_debug("PowerNV detected !\n");
272 define_machine(powernv) {
275 .init_early = pnv_init_early,
276 .setup_arch = pnv_setup_arch,
277 .init_IRQ = pnv_init_IRQ,
278 .show_cpuinfo = pnv_show_cpuinfo,
279 .progress = pnv_progress,
280 .machine_shutdown = pnv_shutdown,
281 .power_save = power7_idle,
282 .calibrate_decr = generic_calibrate_decr,
283 .dma_set_mask = pnv_dma_set_mask,
285 .kexec_cpu_down = pnv_kexec_cpu_down,