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> 26 #include <linux/interrupt.h> 27 #include <linux/bug.h> 28 29 #include <asm/machdep.h> 30 #include <asm/firmware.h> 31 #include <asm/xics.h> 32 #include <asm/rtas.h> 33 #include <asm/opal.h> 34 35 #include "powernv.h" 36 37 static void __init pnv_setup_arch(void) 38 { 39 /* Initialize SMP */ 40 pnv_smp_init(); 41 42 /* Setup PCI */ 43 pnv_pci_init(); 44 45 /* Setup RTC and NVRAM callbacks */ 46 if (firmware_has_feature(FW_FEATURE_OPAL)) 47 opal_nvram_init(); 48 49 /* Enable NAP mode */ 50 powersave_nap = 1; 51 52 /* XXX PMCS */ 53 } 54 55 static void __init pnv_init_early(void) 56 { 57 #ifdef CONFIG_HVC_OPAL 58 if (firmware_has_feature(FW_FEATURE_OPAL)) 59 hvc_opal_init_early(); 60 else 61 #endif 62 add_preferred_console("hvc", 0, NULL); 63 } 64 65 static void __init pnv_init_IRQ(void) 66 { 67 xics_init(); 68 69 WARN_ON(!ppc_md.get_irq); 70 } 71 72 static void pnv_show_cpuinfo(struct seq_file *m) 73 { 74 struct device_node *root; 75 const char *model = ""; 76 77 root = of_find_node_by_path("/"); 78 if (root) 79 model = of_get_property(root, "model", NULL); 80 seq_printf(m, "machine\t\t: PowerNV %s\n", model); 81 if (firmware_has_feature(FW_FEATURE_OPALv3)) 82 seq_printf(m, "firmware\t: OPAL v3\n"); 83 else if (firmware_has_feature(FW_FEATURE_OPALv2)) 84 seq_printf(m, "firmware\t: OPAL v2\n"); 85 else if (firmware_has_feature(FW_FEATURE_OPAL)) 86 seq_printf(m, "firmware\t: OPAL v1\n"); 87 else 88 seq_printf(m, "firmware\t: BML\n"); 89 of_node_put(root); 90 } 91 92 static void __noreturn pnv_restart(char *cmd) 93 { 94 long rc = OPAL_BUSY; 95 96 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 97 rc = opal_cec_reboot(); 98 if (rc == OPAL_BUSY_EVENT) 99 opal_poll_events(NULL); 100 else 101 mdelay(10); 102 } 103 for (;;) 104 opal_poll_events(NULL); 105 } 106 107 static void __noreturn pnv_power_off(void) 108 { 109 long rc = OPAL_BUSY; 110 111 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 112 rc = opal_cec_power_down(0); 113 if (rc == OPAL_BUSY_EVENT) 114 opal_poll_events(NULL); 115 else 116 mdelay(10); 117 } 118 for (;;) 119 opal_poll_events(NULL); 120 } 121 122 static void __noreturn pnv_halt(void) 123 { 124 pnv_power_off(); 125 } 126 127 static void pnv_progress(char *s, unsigned short hex) 128 { 129 } 130 131 static void pnv_shutdown(void) 132 { 133 /* Let the PCI code clear up IODA tables */ 134 pnv_pci_shutdown(); 135 136 /* And unregister all OPAL interrupts so they don't fire 137 * up while we kexec 138 */ 139 opal_shutdown(); 140 } 141 142 #ifdef CONFIG_KEXEC 143 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 144 { 145 xics_kexec_teardown_cpu(secondary); 146 } 147 #endif /* CONFIG_KEXEC */ 148 149 static void __init pnv_setup_machdep_opal(void) 150 { 151 ppc_md.get_boot_time = opal_get_boot_time; 152 ppc_md.get_rtc_time = opal_get_rtc_time; 153 ppc_md.set_rtc_time = opal_set_rtc_time; 154 ppc_md.restart = pnv_restart; 155 ppc_md.power_off = pnv_power_off; 156 ppc_md.halt = pnv_halt; 157 ppc_md.machine_check_exception = opal_machine_check; 158 } 159 160 #ifdef CONFIG_PPC_POWERNV_RTAS 161 static void __init pnv_setup_machdep_rtas(void) 162 { 163 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { 164 ppc_md.get_boot_time = rtas_get_boot_time; 165 ppc_md.get_rtc_time = rtas_get_rtc_time; 166 ppc_md.set_rtc_time = rtas_set_rtc_time; 167 } 168 ppc_md.restart = rtas_restart; 169 ppc_md.power_off = rtas_power_off; 170 ppc_md.halt = rtas_halt; 171 } 172 #endif /* CONFIG_PPC_POWERNV_RTAS */ 173 174 static int __init pnv_probe(void) 175 { 176 unsigned long root = of_get_flat_dt_root(); 177 178 if (!of_flat_dt_is_compatible(root, "ibm,powernv")) 179 return 0; 180 181 hpte_init_native(); 182 183 if (firmware_has_feature(FW_FEATURE_OPAL)) 184 pnv_setup_machdep_opal(); 185 #ifdef CONFIG_PPC_POWERNV_RTAS 186 else if (rtas.base) 187 pnv_setup_machdep_rtas(); 188 #endif /* CONFIG_PPC_POWERNV_RTAS */ 189 190 pr_debug("PowerNV detected !\n"); 191 192 return 1; 193 } 194 195 define_machine(powernv) { 196 .name = "PowerNV", 197 .probe = pnv_probe, 198 .init_early = pnv_init_early, 199 .setup_arch = pnv_setup_arch, 200 .init_IRQ = pnv_init_IRQ, 201 .show_cpuinfo = pnv_show_cpuinfo, 202 .progress = pnv_progress, 203 .machine_shutdown = pnv_shutdown, 204 .power_save = power7_idle, 205 .calibrate_decr = generic_calibrate_decr, 206 #ifdef CONFIG_KEXEC 207 .kexec_cpu_down = pnv_kexec_cpu_down, 208 #endif 209 }; 210