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 #include <asm/xics.h> 35 36 #include "powernv.h" 37 38 static void __init pnv_setup_arch(void) 39 { 40 /* Initialize SMP */ 41 pnv_smp_init(); 42 43 /* Setup PCI */ 44 pnv_pci_init(); 45 46 /* Setup RTC and NVRAM callbacks */ 47 if (firmware_has_feature(FW_FEATURE_OPAL)) 48 opal_nvram_init(); 49 50 /* Enable NAP mode */ 51 powersave_nap = 1; 52 53 /* XXX PMCS */ 54 } 55 56 static void __init pnv_init_early(void) 57 { 58 #ifdef CONFIG_HVC_OPAL 59 if (firmware_has_feature(FW_FEATURE_OPAL)) 60 hvc_opal_init_early(); 61 else 62 #endif 63 add_preferred_console("hvc", 0, NULL); 64 } 65 66 static void __init pnv_init_IRQ(void) 67 { 68 xics_init(); 69 70 WARN_ON(!ppc_md.get_irq); 71 } 72 73 static void pnv_show_cpuinfo(struct seq_file *m) 74 { 75 struct device_node *root; 76 const char *model = ""; 77 78 root = of_find_node_by_path("/"); 79 if (root) 80 model = of_get_property(root, "model", NULL); 81 seq_printf(m, "machine\t\t: PowerNV %s\n", model); 82 if (firmware_has_feature(FW_FEATURE_OPALv2)) 83 seq_printf(m, "firmware\t: OPAL v2\n"); 84 else if (firmware_has_feature(FW_FEATURE_OPAL)) 85 seq_printf(m, "firmware\t: OPAL v1\n"); 86 else 87 seq_printf(m, "firmware\t: BML\n"); 88 of_node_put(root); 89 } 90 91 static void __noreturn pnv_restart(char *cmd) 92 { 93 long rc = OPAL_BUSY; 94 95 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 96 rc = opal_cec_reboot(); 97 if (rc == OPAL_BUSY_EVENT) 98 opal_poll_events(NULL); 99 else 100 mdelay(10); 101 } 102 for (;;) 103 opal_poll_events(NULL); 104 } 105 106 static void __noreturn pnv_power_off(void) 107 { 108 long rc = OPAL_BUSY; 109 110 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 111 rc = opal_cec_power_down(0); 112 if (rc == OPAL_BUSY_EVENT) 113 opal_poll_events(NULL); 114 else 115 mdelay(10); 116 } 117 for (;;) 118 opal_poll_events(NULL); 119 } 120 121 static void __noreturn pnv_halt(void) 122 { 123 pnv_power_off(); 124 } 125 126 static void pnv_progress(char *s, unsigned short hex) 127 { 128 } 129 130 #ifdef CONFIG_KEXEC 131 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 132 { 133 xics_kexec_teardown_cpu(secondary); 134 } 135 #endif /* CONFIG_KEXEC */ 136 137 static void __init pnv_setup_machdep_opal(void) 138 { 139 ppc_md.get_boot_time = opal_get_boot_time; 140 ppc_md.get_rtc_time = opal_get_rtc_time; 141 ppc_md.set_rtc_time = opal_set_rtc_time; 142 ppc_md.restart = pnv_restart; 143 ppc_md.power_off = pnv_power_off; 144 ppc_md.halt = pnv_halt; 145 ppc_md.machine_check_exception = opal_machine_check; 146 } 147 148 #ifdef CONFIG_PPC_POWERNV_RTAS 149 static void __init pnv_setup_machdep_rtas(void) 150 { 151 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { 152 ppc_md.get_boot_time = rtas_get_boot_time; 153 ppc_md.get_rtc_time = rtas_get_rtc_time; 154 ppc_md.set_rtc_time = rtas_set_rtc_time; 155 } 156 ppc_md.restart = rtas_restart; 157 ppc_md.power_off = rtas_power_off; 158 ppc_md.halt = rtas_halt; 159 } 160 #endif /* CONFIG_PPC_POWERNV_RTAS */ 161 162 static int __init pnv_probe(void) 163 { 164 unsigned long root = of_get_flat_dt_root(); 165 166 if (!of_flat_dt_is_compatible(root, "ibm,powernv")) 167 return 0; 168 169 hpte_init_native(); 170 171 if (firmware_has_feature(FW_FEATURE_OPAL)) 172 pnv_setup_machdep_opal(); 173 #ifdef CONFIG_PPC_POWERNV_RTAS 174 else if (rtas.base) 175 pnv_setup_machdep_rtas(); 176 #endif /* CONFIG_PPC_POWERNV_RTAS */ 177 178 pr_debug("PowerNV detected !\n"); 179 180 return 1; 181 } 182 183 define_machine(powernv) { 184 .name = "PowerNV", 185 .probe = pnv_probe, 186 .init_early = pnv_init_early, 187 .setup_arch = pnv_setup_arch, 188 .init_IRQ = pnv_init_IRQ, 189 .show_cpuinfo = pnv_show_cpuinfo, 190 .progress = pnv_progress, 191 .power_save = power7_idle, 192 .calibrate_decr = generic_calibrate_decr, 193 #ifdef CONFIG_KEXEC 194 .kexec_cpu_down = pnv_kexec_cpu_down, 195 #endif 196 }; 197