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/cpuidle.h>
30 #include <linux/pci.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 __noreturn pnv_restart(char *cmd)
106 opal_notifier_disable();
108 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
109 rc = opal_cec_reboot();
110 if (rc == OPAL_BUSY_EVENT)
111 opal_poll_events(NULL);
116 opal_poll_events(NULL);
119 static void __noreturn pnv_power_off(void)
123 opal_notifier_disable();
125 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
126 rc = opal_cec_power_down(0);
127 if (rc == OPAL_BUSY_EVENT)
128 opal_poll_events(NULL);
133 opal_poll_events(NULL);
136 static void __noreturn pnv_halt(void)
141 static void pnv_progress(char *s, unsigned short hex)
145 static int pnv_dma_set_mask(struct device *dev, u64 dma_mask)
148 return pnv_pci_dma_set_mask(to_pci_dev(dev), dma_mask);
149 return __dma_set_mask(dev, dma_mask);
152 static void pnv_shutdown(void)
154 /* Let the PCI code clear up IODA tables */
158 * Stop OPAL activity: Unregister all OPAL interrupts so they
159 * don't fire up while we kexec and make sure all potentially
160 * DMA'ing ops are complete (such as dump retrieval).
166 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
168 xics_kexec_teardown_cpu(secondary);
170 /* Return secondary CPUs to firmware on OPAL v3 */
171 if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) {
173 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
176 /* Return the CPU to OPAL */
180 #endif /* CONFIG_KEXEC */
182 static void __init pnv_setup_machdep_opal(void)
184 ppc_md.get_boot_time = opal_get_boot_time;
185 ppc_md.get_rtc_time = opal_get_rtc_time;
186 ppc_md.set_rtc_time = opal_set_rtc_time;
187 ppc_md.restart = pnv_restart;
188 ppc_md.power_off = pnv_power_off;
189 ppc_md.halt = pnv_halt;
190 ppc_md.machine_check_exception = opal_machine_check;
193 #ifdef CONFIG_PPC_POWERNV_RTAS
194 static void __init pnv_setup_machdep_rtas(void)
196 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
197 ppc_md.get_boot_time = rtas_get_boot_time;
198 ppc_md.get_rtc_time = rtas_get_rtc_time;
199 ppc_md.set_rtc_time = rtas_set_rtc_time;
201 ppc_md.restart = rtas_restart;
202 ppc_md.power_off = rtas_power_off;
203 ppc_md.halt = rtas_halt;
205 #endif /* CONFIG_PPC_POWERNV_RTAS */
207 static int __init pnv_probe(void)
209 unsigned long root = of_get_flat_dt_root();
211 if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
216 if (firmware_has_feature(FW_FEATURE_OPAL))
217 pnv_setup_machdep_opal();
218 #ifdef CONFIG_PPC_POWERNV_RTAS
220 pnv_setup_machdep_rtas();
221 #endif /* CONFIG_PPC_POWERNV_RTAS */
223 pr_debug("PowerNV detected !\n");
228 void powernv_idle(void)
230 /* Hook to cpuidle framework if available, else
231 * call on default platform idle code
233 if (cpuidle_idle_call()) {
238 define_machine(powernv) {
241 .init_early = pnv_init_early,
242 .setup_arch = pnv_setup_arch,
243 .init_IRQ = pnv_init_IRQ,
244 .show_cpuinfo = pnv_show_cpuinfo,
245 .progress = pnv_progress,
246 .machine_shutdown = pnv_shutdown,
247 .power_save = powernv_idle,
248 .calibrate_decr = generic_calibrate_decr,
249 .dma_set_mask = pnv_dma_set_mask,
251 .kexec_cpu_down = pnv_kexec_cpu_down,