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 #include <linux/cpuidle.h> 30 31 #include <asm/machdep.h> 32 #include <asm/firmware.h> 33 #include <asm/xics.h> 34 #include <asm/rtas.h> 35 #include <asm/opal.h> 36 #include <asm/kexec.h> 37 38 #include "powernv.h" 39 40 static void __init pnv_setup_arch(void) 41 { 42 /* Initialize SMP */ 43 pnv_smp_init(); 44 45 /* Setup PCI */ 46 pnv_pci_init(); 47 48 /* Setup RTC and NVRAM callbacks */ 49 if (firmware_has_feature(FW_FEATURE_OPAL)) 50 opal_nvram_init(); 51 52 /* Enable NAP mode */ 53 powersave_nap = 1; 54 55 /* XXX PMCS */ 56 } 57 58 static void __init pnv_init_early(void) 59 { 60 /* 61 * Initialize the LPC bus now so that legacy serial 62 * ports can be found on it 63 */ 64 opal_lpc_init(); 65 66 #ifdef CONFIG_HVC_OPAL 67 if (firmware_has_feature(FW_FEATURE_OPAL)) 68 hvc_opal_init_early(); 69 else 70 #endif 71 add_preferred_console("hvc", 0, NULL); 72 } 73 74 static void __init pnv_init_IRQ(void) 75 { 76 xics_init(); 77 78 WARN_ON(!ppc_md.get_irq); 79 } 80 81 static void pnv_show_cpuinfo(struct seq_file *m) 82 { 83 struct device_node *root; 84 const char *model = ""; 85 86 root = of_find_node_by_path("/"); 87 if (root) 88 model = of_get_property(root, "model", NULL); 89 seq_printf(m, "machine\t\t: PowerNV %s\n", model); 90 if (firmware_has_feature(FW_FEATURE_OPALv3)) 91 seq_printf(m, "firmware\t: OPAL v3\n"); 92 else if (firmware_has_feature(FW_FEATURE_OPALv2)) 93 seq_printf(m, "firmware\t: OPAL v2\n"); 94 else if (firmware_has_feature(FW_FEATURE_OPAL)) 95 seq_printf(m, "firmware\t: OPAL v1\n"); 96 else 97 seq_printf(m, "firmware\t: BML\n"); 98 of_node_put(root); 99 } 100 101 static void __noreturn pnv_restart(char *cmd) 102 { 103 long rc = OPAL_BUSY; 104 105 opal_notifier_disable(); 106 107 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 108 rc = opal_cec_reboot(); 109 if (rc == OPAL_BUSY_EVENT) 110 opal_poll_events(NULL); 111 else 112 mdelay(10); 113 } 114 for (;;) 115 opal_poll_events(NULL); 116 } 117 118 static void __noreturn pnv_power_off(void) 119 { 120 long rc = OPAL_BUSY; 121 122 opal_notifier_disable(); 123 124 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 125 rc = opal_cec_power_down(0); 126 if (rc == OPAL_BUSY_EVENT) 127 opal_poll_events(NULL); 128 else 129 mdelay(10); 130 } 131 for (;;) 132 opal_poll_events(NULL); 133 } 134 135 static void __noreturn pnv_halt(void) 136 { 137 pnv_power_off(); 138 } 139 140 static void pnv_progress(char *s, unsigned short hex) 141 { 142 } 143 144 static void pnv_shutdown(void) 145 { 146 /* Let the PCI code clear up IODA tables */ 147 pnv_pci_shutdown(); 148 149 /* 150 * Stop OPAL activity: Unregister all OPAL interrupts so they 151 * don't fire up while we kexec and make sure all potentially 152 * DMA'ing ops are complete (such as dump retrieval). 153 */ 154 opal_shutdown(); 155 } 156 157 #ifdef CONFIG_KEXEC 158 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 159 { 160 xics_kexec_teardown_cpu(secondary); 161 162 /* Return secondary CPUs to firmware on OPAL v3 */ 163 if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) { 164 mb(); 165 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; 166 mb(); 167 168 /* Return the CPU to OPAL */ 169 opal_return_cpu(); 170 } 171 } 172 #endif /* CONFIG_KEXEC */ 173 174 static void __init pnv_setup_machdep_opal(void) 175 { 176 ppc_md.get_boot_time = opal_get_boot_time; 177 ppc_md.get_rtc_time = opal_get_rtc_time; 178 ppc_md.set_rtc_time = opal_set_rtc_time; 179 ppc_md.restart = pnv_restart; 180 ppc_md.power_off = pnv_power_off; 181 ppc_md.halt = pnv_halt; 182 ppc_md.machine_check_exception = opal_machine_check; 183 } 184 185 #ifdef CONFIG_PPC_POWERNV_RTAS 186 static void __init pnv_setup_machdep_rtas(void) 187 { 188 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { 189 ppc_md.get_boot_time = rtas_get_boot_time; 190 ppc_md.get_rtc_time = rtas_get_rtc_time; 191 ppc_md.set_rtc_time = rtas_set_rtc_time; 192 } 193 ppc_md.restart = rtas_restart; 194 ppc_md.power_off = rtas_power_off; 195 ppc_md.halt = rtas_halt; 196 } 197 #endif /* CONFIG_PPC_POWERNV_RTAS */ 198 199 static int __init pnv_probe(void) 200 { 201 unsigned long root = of_get_flat_dt_root(); 202 203 if (!of_flat_dt_is_compatible(root, "ibm,powernv")) 204 return 0; 205 206 hpte_init_native(); 207 208 if (firmware_has_feature(FW_FEATURE_OPAL)) 209 pnv_setup_machdep_opal(); 210 #ifdef CONFIG_PPC_POWERNV_RTAS 211 else if (rtas.base) 212 pnv_setup_machdep_rtas(); 213 #endif /* CONFIG_PPC_POWERNV_RTAS */ 214 215 pr_debug("PowerNV detected !\n"); 216 217 return 1; 218 } 219 220 void powernv_idle(void) 221 { 222 /* Hook to cpuidle framework if available, else 223 * call on default platform idle code 224 */ 225 if (cpuidle_idle_call()) { 226 power7_idle(); 227 } 228 } 229 230 define_machine(powernv) { 231 .name = "PowerNV", 232 .probe = pnv_probe, 233 .init_early = pnv_init_early, 234 .setup_arch = pnv_setup_arch, 235 .init_IRQ = pnv_init_IRQ, 236 .show_cpuinfo = pnv_show_cpuinfo, 237 .progress = pnv_progress, 238 .machine_shutdown = pnv_shutdown, 239 .power_save = powernv_idle, 240 .calibrate_decr = generic_calibrate_decr, 241 #ifdef CONFIG_KEXEC 242 .kexec_cpu_down = pnv_kexec_cpu_down, 243 #endif 244 }; 245