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 #include <linux/pci.h> 31 32 #include <asm/machdep.h> 33 #include <asm/firmware.h> 34 #include <asm/xics.h> 35 #include <asm/rtas.h> 36 #include <asm/opal.h> 37 #include <asm/kexec.h> 38 39 #include "powernv.h" 40 41 static void __init pnv_setup_arch(void) 42 { 43 /* Initialize SMP */ 44 pnv_smp_init(); 45 46 /* Setup PCI */ 47 pnv_pci_init(); 48 49 /* Setup RTC and NVRAM callbacks */ 50 if (firmware_has_feature(FW_FEATURE_OPAL)) 51 opal_nvram_init(); 52 53 /* Enable NAP mode */ 54 powersave_nap = 1; 55 56 /* XXX PMCS */ 57 } 58 59 static void __init pnv_init_early(void) 60 { 61 /* 62 * Initialize the LPC bus now so that legacy serial 63 * ports can be found on it 64 */ 65 opal_lpc_init(); 66 67 #ifdef CONFIG_HVC_OPAL 68 if (firmware_has_feature(FW_FEATURE_OPAL)) 69 hvc_opal_init_early(); 70 else 71 #endif 72 add_preferred_console("hvc", 0, NULL); 73 } 74 75 static void __init pnv_init_IRQ(void) 76 { 77 xics_init(); 78 79 WARN_ON(!ppc_md.get_irq); 80 } 81 82 static void pnv_show_cpuinfo(struct seq_file *m) 83 { 84 struct device_node *root; 85 const char *model = ""; 86 87 root = of_find_node_by_path("/"); 88 if (root) 89 model = of_get_property(root, "model", NULL); 90 seq_printf(m, "machine\t\t: PowerNV %s\n", model); 91 if (firmware_has_feature(FW_FEATURE_OPALv3)) 92 seq_printf(m, "firmware\t: OPAL v3\n"); 93 else if (firmware_has_feature(FW_FEATURE_OPALv2)) 94 seq_printf(m, "firmware\t: OPAL v2\n"); 95 else if (firmware_has_feature(FW_FEATURE_OPAL)) 96 seq_printf(m, "firmware\t: OPAL v1\n"); 97 else 98 seq_printf(m, "firmware\t: BML\n"); 99 of_node_put(root); 100 } 101 102 static void __noreturn pnv_restart(char *cmd) 103 { 104 long rc = OPAL_BUSY; 105 106 opal_notifier_disable(); 107 108 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 109 rc = opal_cec_reboot(); 110 if (rc == OPAL_BUSY_EVENT) 111 opal_poll_events(NULL); 112 else 113 mdelay(10); 114 } 115 for (;;) 116 opal_poll_events(NULL); 117 } 118 119 static void __noreturn pnv_power_off(void) 120 { 121 long rc = OPAL_BUSY; 122 123 opal_notifier_disable(); 124 125 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 126 rc = opal_cec_power_down(0); 127 if (rc == OPAL_BUSY_EVENT) 128 opal_poll_events(NULL); 129 else 130 mdelay(10); 131 } 132 for (;;) 133 opal_poll_events(NULL); 134 } 135 136 static void __noreturn pnv_halt(void) 137 { 138 pnv_power_off(); 139 } 140 141 static void pnv_progress(char *s, unsigned short hex) 142 { 143 } 144 145 static int pnv_dma_set_mask(struct device *dev, u64 dma_mask) 146 { 147 if (dev_is_pci(dev)) 148 return pnv_pci_dma_set_mask(to_pci_dev(dev), dma_mask); 149 return __dma_set_mask(dev, dma_mask); 150 } 151 152 static void pnv_shutdown(void) 153 { 154 /* Let the PCI code clear up IODA tables */ 155 pnv_pci_shutdown(); 156 157 /* 158 * Stop OPAL activity: Unregister all OPAL interrupts so they 159 * don't fire up while we kexec and make sure all potentially 160 * DMA'ing ops are complete (such as dump retrieval). 161 */ 162 opal_shutdown(); 163 } 164 165 #ifdef CONFIG_KEXEC 166 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 167 { 168 xics_kexec_teardown_cpu(secondary); 169 170 /* Return secondary CPUs to firmware on OPAL v3 */ 171 if (firmware_has_feature(FW_FEATURE_OPALv3) && secondary) { 172 mb(); 173 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; 174 mb(); 175 176 /* Return the CPU to OPAL */ 177 opal_return_cpu(); 178 } 179 } 180 #endif /* CONFIG_KEXEC */ 181 182 static void __init pnv_setup_machdep_opal(void) 183 { 184 ppc_md.get_boot_time = opal_get_boot_time; 185 ppc_md.get_rtc_time = opal_get_rtc_time; 186 ppc_md.set_rtc_time = opal_set_rtc_time; 187 ppc_md.restart = pnv_restart; 188 ppc_md.power_off = pnv_power_off; 189 ppc_md.halt = pnv_halt; 190 ppc_md.machine_check_exception = opal_machine_check; 191 } 192 193 #ifdef CONFIG_PPC_POWERNV_RTAS 194 static void __init pnv_setup_machdep_rtas(void) 195 { 196 if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) { 197 ppc_md.get_boot_time = rtas_get_boot_time; 198 ppc_md.get_rtc_time = rtas_get_rtc_time; 199 ppc_md.set_rtc_time = rtas_set_rtc_time; 200 } 201 ppc_md.restart = rtas_restart; 202 ppc_md.power_off = rtas_power_off; 203 ppc_md.halt = rtas_halt; 204 } 205 #endif /* CONFIG_PPC_POWERNV_RTAS */ 206 207 static int __init pnv_probe(void) 208 { 209 unsigned long root = of_get_flat_dt_root(); 210 211 if (!of_flat_dt_is_compatible(root, "ibm,powernv")) 212 return 0; 213 214 hpte_init_native(); 215 216 if (firmware_has_feature(FW_FEATURE_OPAL)) 217 pnv_setup_machdep_opal(); 218 #ifdef CONFIG_PPC_POWERNV_RTAS 219 else if (rtas.base) 220 pnv_setup_machdep_rtas(); 221 #endif /* CONFIG_PPC_POWERNV_RTAS */ 222 223 pr_debug("PowerNV detected !\n"); 224 225 return 1; 226 } 227 228 void powernv_idle(void) 229 { 230 /* Hook to cpuidle framework if available, else 231 * call on default platform idle code 232 */ 233 if (cpuidle_idle_call()) { 234 power7_idle(); 235 } 236 } 237 238 define_machine(powernv) { 239 .name = "PowerNV", 240 .probe = pnv_probe, 241 .init_early = pnv_init_early, 242 .setup_arch = pnv_setup_arch, 243 .init_IRQ = pnv_init_IRQ, 244 .show_cpuinfo = pnv_show_cpuinfo, 245 .progress = pnv_progress, 246 .machine_shutdown = pnv_shutdown, 247 .power_save = powernv_idle, 248 .calibrate_decr = generic_calibrate_decr, 249 .dma_set_mask = pnv_dma_set_mask, 250 #ifdef CONFIG_KEXEC 251 .kexec_cpu_down = pnv_kexec_cpu_down, 252 #endif 253 }; 254