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/of_fdt.h> 27 #include <linux/interrupt.h> 28 #include <linux/bug.h> 29 30 #include <asm/machdep.h> 31 #include <asm/firmware.h> 32 #include <asm/xics.h> 33 #include <asm/rtas.h> 34 #include <asm/opal.h> 35 #include <asm/kexec.h> 36 37 #include "powernv.h" 38 39 static void __init pnv_setup_arch(void) 40 { 41 /* Initialize SMP */ 42 pnv_smp_init(); 43 44 /* Setup PCI */ 45 pnv_pci_init(); 46 47 /* Setup RTC and NVRAM callbacks */ 48 if (firmware_has_feature(FW_FEATURE_OPAL)) 49 opal_nvram_init(); 50 51 /* Enable NAP mode */ 52 powersave_nap = 1; 53 54 /* XXX PMCS */ 55 } 56 57 static void __init pnv_init_early(void) 58 { 59 /* 60 * Initialize the LPC bus now so that legacy serial 61 * ports can be found on it 62 */ 63 opal_lpc_init(); 64 65 #ifdef CONFIG_HVC_OPAL 66 if (firmware_has_feature(FW_FEATURE_OPAL)) 67 hvc_opal_init_early(); 68 else 69 #endif 70 add_preferred_console("hvc", 0, NULL); 71 } 72 73 static void __init pnv_init_IRQ(void) 74 { 75 xics_init(); 76 77 WARN_ON(!ppc_md.get_irq); 78 } 79 80 static void pnv_show_cpuinfo(struct seq_file *m) 81 { 82 struct device_node *root; 83 const char *model = ""; 84 85 root = of_find_node_by_path("/"); 86 if (root) 87 model = of_get_property(root, "model", NULL); 88 seq_printf(m, "machine\t\t: PowerNV %s\n", model); 89 if (firmware_has_feature(FW_FEATURE_OPALv3)) 90 seq_printf(m, "firmware\t: OPAL v3\n"); 91 else if (firmware_has_feature(FW_FEATURE_OPALv2)) 92 seq_printf(m, "firmware\t: OPAL v2\n"); 93 else if (firmware_has_feature(FW_FEATURE_OPAL)) 94 seq_printf(m, "firmware\t: OPAL v1\n"); 95 else 96 seq_printf(m, "firmware\t: BML\n"); 97 of_node_put(root); 98 } 99 100 static void __noreturn pnv_restart(char *cmd) 101 { 102 long rc = OPAL_BUSY; 103 104 opal_notifier_disable(); 105 106 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 107 rc = opal_cec_reboot(); 108 if (rc == OPAL_BUSY_EVENT) 109 opal_poll_events(NULL); 110 else 111 mdelay(10); 112 } 113 for (;;) 114 opal_poll_events(NULL); 115 } 116 117 static void __noreturn pnv_power_off(void) 118 { 119 long rc = OPAL_BUSY; 120 121 opal_notifier_disable(); 122 123 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 124 rc = opal_cec_power_down(0); 125 if (rc == OPAL_BUSY_EVENT) 126 opal_poll_events(NULL); 127 else 128 mdelay(10); 129 } 130 for (;;) 131 opal_poll_events(NULL); 132 } 133 134 static void __noreturn pnv_halt(void) 135 { 136 pnv_power_off(); 137 } 138 139 static void pnv_progress(char *s, unsigned short hex) 140 { 141 } 142 143 static void pnv_shutdown(void) 144 { 145 /* Let the PCI code clear up IODA tables */ 146 pnv_pci_shutdown(); 147 148 /* And unregister all OPAL interrupts so they don't fire 149 * up while we kexec 150 */ 151 opal_shutdown(); 152 } 153 154 #ifdef CONFIG_KEXEC 155 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 156 { 157 xics_kexec_teardown_cpu(secondary); 158 159 /* Return secondary CPUs to firmware on OPAL v3 */ 160 if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) { 161 mb(); 162 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; 163 mb(); 164 165 /* Return the CPU to OPAL */ 166 opal_return_cpu(); 167 } 168 } 169 #endif /* CONFIG_KEXEC */ 170 171 static void __init pnv_setup_machdep_opal(void) 172 { 173 ppc_md.get_boot_time = opal_get_boot_time; 174 ppc_md.get_rtc_time = opal_get_rtc_time; 175 ppc_md.set_rtc_time = opal_set_rtc_time; 176 ppc_md.restart = pnv_restart; 177 ppc_md.power_off = pnv_power_off; 178 ppc_md.halt = pnv_halt; 179 ppc_md.machine_check_exception = opal_machine_check; 180 } 181 182 #ifdef CONFIG_PPC_POWERNV_RTAS 183 static void __init pnv_setup_machdep_rtas(void) 184 { 185 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { 186 ppc_md.get_boot_time = rtas_get_boot_time; 187 ppc_md.get_rtc_time = rtas_get_rtc_time; 188 ppc_md.set_rtc_time = rtas_set_rtc_time; 189 } 190 ppc_md.restart = rtas_restart; 191 ppc_md.power_off = rtas_power_off; 192 ppc_md.halt = rtas_halt; 193 } 194 #endif /* CONFIG_PPC_POWERNV_RTAS */ 195 196 static int __init pnv_probe(void) 197 { 198 unsigned long root = of_get_flat_dt_root(); 199 200 if (!of_flat_dt_is_compatible(root, "ibm,powernv")) 201 return 0; 202 203 hpte_init_native(); 204 205 if (firmware_has_feature(FW_FEATURE_OPAL)) 206 pnv_setup_machdep_opal(); 207 #ifdef CONFIG_PPC_POWERNV_RTAS 208 else if (rtas.base) 209 pnv_setup_machdep_rtas(); 210 #endif /* CONFIG_PPC_POWERNV_RTAS */ 211 212 pr_debug("PowerNV detected !\n"); 213 214 return 1; 215 } 216 217 define_machine(powernv) { 218 .name = "PowerNV", 219 .probe = pnv_probe, 220 .init_early = pnv_init_early, 221 .setup_arch = pnv_setup_arch, 222 .init_IRQ = pnv_init_IRQ, 223 .show_cpuinfo = pnv_show_cpuinfo, 224 .progress = pnv_progress, 225 .machine_shutdown = pnv_shutdown, 226 .power_save = power7_idle, 227 .calibrate_decr = generic_calibrate_decr, 228 #ifdef CONFIG_KEXEC 229 .kexec_cpu_down = pnv_kexec_cpu_down, 230 #endif 231 }; 232