1/* 2 * Maple (970 eval board) setup code 3 * 4 * (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org), 5 * IBM Corp. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 * 12 */ 13 14#undef DEBUG 15 16#include <linux/init.h> 17#include <linux/errno.h> 18#include <linux/sched.h> 19#include <linux/kernel.h> 20#include <linux/mm.h> 21#include <linux/stddef.h> 22#include <linux/unistd.h> 23#include <linux/ptrace.h> 24#include <linux/slab.h> 25#include <linux/user.h> 26#include <linux/a.out.h> 27#include <linux/tty.h> 28#include <linux/string.h> 29#include <linux/delay.h> 30#include <linux/ioport.h> 31#include <linux/major.h> 32#include <linux/initrd.h> 33#include <linux/vt_kern.h> 34#include <linux/console.h> 35#include <linux/pci.h> 36#include <linux/adb.h> 37#include <linux/cuda.h> 38#include <linux/pmu.h> 39#include <linux/irq.h> 40#include <linux/seq_file.h> 41#include <linux/root_dev.h> 42#include <linux/serial.h> 43#include <linux/smp.h> 44 45#include <asm/processor.h> 46#include <asm/sections.h> 47#include <asm/prom.h> 48#include <asm/system.h> 49#include <asm/pgtable.h> 50#include <asm/bitops.h> 51#include <asm/io.h> 52#include <asm/kexec.h> 53#include <asm/pci-bridge.h> 54#include <asm/iommu.h> 55#include <asm/machdep.h> 56#include <asm/dma.h> 57#include <asm/cputable.h> 58#include <asm/time.h> 59#include <asm/of_device.h> 60#include <asm/lmb.h> 61#include <asm/mpic.h> 62#include <asm/rtas.h> 63#include <asm/udbg.h> 64#include <asm/nvram.h> 65 66#include "maple.h" 67 68#ifdef DEBUG 69#define DBG(fmt...) udbg_printf(fmt) 70#else 71#define DBG(fmt...) 72#endif 73 74static unsigned long maple_find_nvram_base(void) 75{ 76 struct device_node *rtcs; 77 unsigned long result = 0; 78 79 /* find NVRAM device */ 80 rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111"); 81 if (rtcs) { 82 struct resource r; 83 if (of_address_to_resource(rtcs, 0, &r)) { 84 printk(KERN_EMERG "Maple: Unable to translate NVRAM" 85 " address\n"); 86 goto bail; 87 } 88 if (!(r.flags & IORESOURCE_IO)) { 89 printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n"); 90 goto bail; 91 } 92 result = r.start; 93 } else 94 printk(KERN_EMERG "Maple: Unable to find NVRAM\n"); 95 bail: 96 of_node_put(rtcs); 97 return result; 98} 99 100static void maple_restart(char *cmd) 101{ 102 unsigned int maple_nvram_base; 103 const unsigned int *maple_nvram_offset, *maple_nvram_command; 104 struct device_node *sp; 105 106 maple_nvram_base = maple_find_nvram_base(); 107 if (maple_nvram_base == 0) 108 goto fail; 109 110 /* find service processor device */ 111 sp = of_find_node_by_name(NULL, "service-processor"); 112 if (!sp) { 113 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 114 goto fail; 115 } 116 maple_nvram_offset = of_get_property(sp, "restart-addr", NULL); 117 maple_nvram_command = of_get_property(sp, "restart-value", NULL); 118 of_node_put(sp); 119 120 /* send command */ 121 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 122 for (;;) ; 123 fail: 124 printk(KERN_EMERG "Maple: Manual Restart Required\n"); 125} 126 127static void maple_power_off(void) 128{ 129 unsigned int maple_nvram_base; 130 const unsigned int *maple_nvram_offset, *maple_nvram_command; 131 struct device_node *sp; 132 133 maple_nvram_base = maple_find_nvram_base(); 134 if (maple_nvram_base == 0) 135 goto fail; 136 137 /* find service processor device */ 138 sp = of_find_node_by_name(NULL, "service-processor"); 139 if (!sp) { 140 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 141 goto fail; 142 } 143 maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL); 144 maple_nvram_command = of_get_property(sp, "power-off-value", NULL); 145 of_node_put(sp); 146 147 /* send command */ 148 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 149 for (;;) ; 150 fail: 151 printk(KERN_EMERG "Maple: Manual Power-Down Required\n"); 152} 153 154static void maple_halt(void) 155{ 156 maple_power_off(); 157} 158 159#ifdef CONFIG_SMP 160struct smp_ops_t maple_smp_ops = { 161 .probe = smp_mpic_probe, 162 .message_pass = smp_mpic_message_pass, 163 .kick_cpu = smp_generic_kick_cpu, 164 .setup_cpu = smp_mpic_setup_cpu, 165 .give_timebase = smp_generic_give_timebase, 166 .take_timebase = smp_generic_take_timebase, 167}; 168#endif /* CONFIG_SMP */ 169 170static void __init maple_use_rtas_reboot_and_halt_if_present(void) 171{ 172 if (rtas_service_present("system-reboot") && 173 rtas_service_present("power-off")) { 174 ppc_md.restart = rtas_restart; 175 ppc_md.power_off = rtas_power_off; 176 ppc_md.halt = rtas_halt; 177 } 178} 179 180void __init maple_setup_arch(void) 181{ 182 /* init to some ~sane value until calibrate_delay() runs */ 183 loops_per_jiffy = 50000000; 184 185 /* Setup SMP callback */ 186#ifdef CONFIG_SMP 187 smp_ops = &maple_smp_ops; 188#endif 189 /* Lookup PCI hosts */ 190 maple_pci_init(); 191 192#ifdef CONFIG_DUMMY_CONSOLE 193 conswitchp = &dummy_con; 194#endif 195 maple_use_rtas_reboot_and_halt_if_present(); 196 197 printk(KERN_DEBUG "Using native/NAP idle loop\n"); 198 199 mmio_nvram_init(); 200} 201 202/* 203 * Early initialization. 204 */ 205static void __init maple_init_early(void) 206{ 207 DBG(" -> maple_init_early\n"); 208 209 iommu_init_early_dart(); 210 211 DBG(" <- maple_init_early\n"); 212} 213 214/* 215 * This is almost identical to pSeries and CHRP. We need to make that 216 * code generic at one point, with appropriate bits in the device-tree to 217 * identify the presence of an HT APIC 218 */ 219static void __init maple_init_IRQ(void) 220{ 221 struct device_node *root, *np, *mpic_node = NULL; 222 const unsigned int *opprop; 223 unsigned long openpic_addr = 0; 224 int naddr, n, i, opplen, has_isus = 0; 225 struct mpic *mpic; 226 unsigned int flags = MPIC_PRIMARY; 227 228 /* Locate MPIC in the device-tree. Note that there is a bug 229 * in Maple device-tree where the type of the controller is 230 * open-pic and not interrupt-controller 231 */ 232 233 for_each_node_by_type(np, "interrupt-controller") 234 if (of_device_is_compatible(np, "open-pic")) { 235 mpic_node = np; 236 break; 237 } 238 if (mpic_node == NULL) 239 for_each_node_by_type(np, "open-pic") { 240 mpic_node = np; 241 break; 242 } 243 if (mpic_node == NULL) { 244 printk(KERN_ERR 245 "Failed to locate the MPIC interrupt controller\n"); 246 return; 247 } 248 249 /* Find address list in /platform-open-pic */ 250 root = of_find_node_by_path("/"); 251 naddr = of_n_addr_cells(root); 252 opprop = of_get_property(root, "platform-open-pic", &opplen); 253 if (opprop != 0) { 254 openpic_addr = of_read_number(opprop, naddr); 255 has_isus = (opplen > naddr); 256 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n", 257 openpic_addr, has_isus); 258 } 259 260 BUG_ON(openpic_addr == 0); 261 262 /* Check for a big endian MPIC */ 263 if (of_get_property(np, "big-endian", NULL) != NULL) 264 flags |= MPIC_BIG_ENDIAN; 265 266 flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET; 267 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */ 268 flags |= MPIC_BIG_ENDIAN; 269 270 /* Setup the openpic driver. More device-tree junks, we hard code no 271 * ISUs for now. I'll have to revisit some stuffs with the folks doing 272 * the firmware for those 273 */ 274 mpic = mpic_alloc(mpic_node, openpic_addr, flags, 275 /*has_isus ? 16 :*/ 0, 0, " MPIC "); 276 BUG_ON(mpic == NULL); 277 278 /* Add ISUs */ 279 opplen /= sizeof(u32); 280 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 281 unsigned long isuaddr = of_read_number(opprop + i, naddr); 282 mpic_assign_isu(mpic, n, isuaddr); 283 } 284 285 /* All ISUs are setup, complete initialization */ 286 mpic_init(mpic); 287 ppc_md.get_irq = mpic_get_irq; 288 of_node_put(mpic_node); 289 of_node_put(root); 290} 291 292static void __init maple_progress(char *s, unsigned short hex) 293{ 294 printk("*** %04x : %s\n", hex, s ? s : ""); 295} 296 297 298/* 299 * Called very early, MMU is off, device-tree isn't unflattened 300 */ 301static int __init maple_probe(void) 302{ 303 unsigned long root = of_get_flat_dt_root(); 304 305 if (!of_flat_dt_is_compatible(root, "Momentum,Maple") && 306 !of_flat_dt_is_compatible(root, "Momentum,Apache")) 307 return 0; 308 /* 309 * On U3, the DART (iommu) must be allocated now since it 310 * has an impact on htab_initialize (due to the large page it 311 * occupies having to be broken up so the DART itself is not 312 * part of the cacheable linar mapping 313 */ 314 alloc_dart_table(); 315 316 hpte_init_native(); 317 318 return 1; 319} 320 321define_machine(maple_md) { 322 .name = "Maple", 323 .probe = maple_probe, 324 .setup_arch = maple_setup_arch, 325 .init_early = maple_init_early, 326 .init_IRQ = maple_init_IRQ, 327 .pci_irq_fixup = maple_pci_irq_fixup, 328 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq, 329 .restart = maple_restart, 330 .power_off = maple_power_off, 331 .halt = maple_halt, 332 .get_boot_time = maple_get_boot_time, 333 .set_rtc_time = maple_set_rtc_time, 334 .get_rtc_time = maple_get_rtc_time, 335 .calibrate_decr = generic_calibrate_decr, 336 .progress = maple_progress, 337 .power_save = power4_idle, 338#ifdef CONFIG_KEXEC 339 .machine_kexec = default_machine_kexec, 340 .machine_kexec_prepare = default_machine_kexec_prepare, 341 .machine_crash_shutdown = default_machine_crash_shutdown, 342#endif 343}; 344