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/kexec.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 /* 59 * Initialize the LPC bus now so that legacy serial 60 * ports can be found on it 61 */ 62 opal_lpc_init(); 63 64 #ifdef CONFIG_HVC_OPAL 65 if (firmware_has_feature(FW_FEATURE_OPAL)) 66 hvc_opal_init_early(); 67 else 68 #endif 69 add_preferred_console("hvc", 0, NULL); 70 } 71 72 static void __init pnv_init_IRQ(void) 73 { 74 xics_init(); 75 76 WARN_ON(!ppc_md.get_irq); 77 } 78 79 static void pnv_show_cpuinfo(struct seq_file *m) 80 { 81 struct device_node *root; 82 const char *model = ""; 83 84 root = of_find_node_by_path("/"); 85 if (root) 86 model = of_get_property(root, "model", NULL); 87 seq_printf(m, "machine\t\t: PowerNV %s\n", model); 88 if (firmware_has_feature(FW_FEATURE_OPALv3)) 89 seq_printf(m, "firmware\t: OPAL v3\n"); 90 else if (firmware_has_feature(FW_FEATURE_OPALv2)) 91 seq_printf(m, "firmware\t: OPAL v2\n"); 92 else if (firmware_has_feature(FW_FEATURE_OPAL)) 93 seq_printf(m, "firmware\t: OPAL v1\n"); 94 else 95 seq_printf(m, "firmware\t: BML\n"); 96 of_node_put(root); 97 } 98 99 static void __noreturn pnv_restart(char *cmd) 100 { 101 long rc = OPAL_BUSY; 102 103 opal_notifier_disable(); 104 105 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 106 rc = opal_cec_reboot(); 107 if (rc == OPAL_BUSY_EVENT) 108 opal_poll_events(NULL); 109 else 110 mdelay(10); 111 } 112 for (;;) 113 opal_poll_events(NULL); 114 } 115 116 static void __noreturn pnv_power_off(void) 117 { 118 long rc = OPAL_BUSY; 119 120 opal_notifier_disable(); 121 122 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 123 rc = opal_cec_power_down(0); 124 if (rc == OPAL_BUSY_EVENT) 125 opal_poll_events(NULL); 126 else 127 mdelay(10); 128 } 129 for (;;) 130 opal_poll_events(NULL); 131 } 132 133 static void __noreturn pnv_halt(void) 134 { 135 pnv_power_off(); 136 } 137 138 static void pnv_progress(char *s, unsigned short hex) 139 { 140 } 141 142 static void pnv_shutdown(void) 143 { 144 /* Let the PCI code clear up IODA tables */ 145 pnv_pci_shutdown(); 146 147 /* And unregister all OPAL interrupts so they don't fire 148 * up while we kexec 149 */ 150 opal_shutdown(); 151 } 152 153 #ifdef CONFIG_KEXEC 154 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 155 { 156 xics_kexec_teardown_cpu(secondary); 157 158 /* Return secondary CPUs to firmware on OPAL v3 */ 159 if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) { 160 mb(); 161 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; 162 mb(); 163 164 /* Return the CPU to OPAL */ 165 opal_return_cpu(); 166 } 167 } 168 #endif /* CONFIG_KEXEC */ 169 170 static void __init pnv_setup_machdep_opal(void) 171 { 172 ppc_md.get_boot_time = opal_get_boot_time; 173 ppc_md.get_rtc_time = opal_get_rtc_time; 174 ppc_md.set_rtc_time = opal_set_rtc_time; 175 ppc_md.restart = pnv_restart; 176 ppc_md.power_off = pnv_power_off; 177 ppc_md.halt = pnv_halt; 178 ppc_md.machine_check_exception = opal_machine_check; 179 } 180 181 #ifdef CONFIG_PPC_POWERNV_RTAS 182 static void __init pnv_setup_machdep_rtas(void) 183 { 184 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { 185 ppc_md.get_boot_time = rtas_get_boot_time; 186 ppc_md.get_rtc_time = rtas_get_rtc_time; 187 ppc_md.set_rtc_time = rtas_set_rtc_time; 188 } 189 ppc_md.restart = rtas_restart; 190 ppc_md.power_off = rtas_power_off; 191 ppc_md.halt = rtas_halt; 192 } 193 #endif /* CONFIG_PPC_POWERNV_RTAS */ 194 195 static int __init pnv_probe(void) 196 { 197 unsigned long root = of_get_flat_dt_root(); 198 199 if (!of_flat_dt_is_compatible(root, "ibm,powernv")) 200 return 0; 201 202 hpte_init_native(); 203 204 if (firmware_has_feature(FW_FEATURE_OPAL)) 205 pnv_setup_machdep_opal(); 206 #ifdef CONFIG_PPC_POWERNV_RTAS 207 else if (rtas.base) 208 pnv_setup_machdep_rtas(); 209 #endif /* CONFIG_PPC_POWERNV_RTAS */ 210 211 pr_debug("PowerNV detected !\n"); 212 213 return 1; 214 } 215 216 define_machine(powernv) { 217 .name = "PowerNV", 218 .probe = pnv_probe, 219 .init_early = pnv_init_early, 220 .setup_arch = pnv_setup_arch, 221 .init_IRQ = pnv_init_IRQ, 222 .show_cpuinfo = pnv_show_cpuinfo, 223 .progress = pnv_progress, 224 .machine_shutdown = pnv_shutdown, 225 .power_save = power7_idle, 226 .calibrate_decr = generic_calibrate_decr, 227 #ifdef CONFIG_KEXEC 228 .kexec_cpu_down = pnv_kexec_cpu_down, 229 #endif 230 }; 231