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 #include <linux/bitops.h> 45 #include <linux/of_device.h> 46 #include <linux/lmb.h> 47 48 #include <asm/processor.h> 49 #include <asm/sections.h> 50 #include <asm/prom.h> 51 #include <asm/system.h> 52 #include <asm/pgtable.h> 53 #include <asm/io.h> 54 #include <asm/kexec.h> 55 #include <asm/pci-bridge.h> 56 #include <asm/iommu.h> 57 #include <asm/machdep.h> 58 #include <asm/dma.h> 59 #include <asm/cputable.h> 60 #include <asm/time.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 74 static 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 } 99 100 static 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 } 126 127 static 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 } 153 154 static void maple_halt(void) 155 { 156 maple_power_off(); 157 } 158 159 #ifdef CONFIG_SMP 160 struct 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 */ 169 170 static 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 } 179 180 void __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 */ 205 static 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 */ 219 static 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 /* XXX Maple specific bits */ 267 flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET; 268 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */ 269 flags |= MPIC_BIG_ENDIAN; 270 271 /* Setup the openpic driver. More device-tree junks, we hard code no 272 * ISUs for now. I'll have to revisit some stuffs with the folks doing 273 * the firmware for those 274 */ 275 mpic = mpic_alloc(mpic_node, openpic_addr, flags, 276 /*has_isus ? 16 :*/ 0, 0, " MPIC "); 277 BUG_ON(mpic == NULL); 278 279 /* Add ISUs */ 280 opplen /= sizeof(u32); 281 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 282 unsigned long isuaddr = of_read_number(opprop + i, naddr); 283 mpic_assign_isu(mpic, n, isuaddr); 284 } 285 286 /* All ISUs are setup, complete initialization */ 287 mpic_init(mpic); 288 ppc_md.get_irq = mpic_get_irq; 289 of_node_put(mpic_node); 290 of_node_put(root); 291 } 292 293 static void __init maple_progress(char *s, unsigned short hex) 294 { 295 printk("*** %04x : %s\n", hex, s ? s : ""); 296 } 297 298 299 /* 300 * Called very early, MMU is off, device-tree isn't unflattened 301 */ 302 static int __init maple_probe(void) 303 { 304 unsigned long root = of_get_flat_dt_root(); 305 306 if (!of_flat_dt_is_compatible(root, "Momentum,Maple") && 307 !of_flat_dt_is_compatible(root, "Momentum,Apache")) 308 return 0; 309 /* 310 * On U3, the DART (iommu) must be allocated now since it 311 * has an impact on htab_initialize (due to the large page it 312 * occupies having to be broken up so the DART itself is not 313 * part of the cacheable linar mapping 314 */ 315 alloc_dart_table(); 316 317 hpte_init_native(); 318 319 return 1; 320 } 321 322 define_machine(maple) { 323 .name = "Maple", 324 .probe = maple_probe, 325 .setup_arch = maple_setup_arch, 326 .init_early = maple_init_early, 327 .init_IRQ = maple_init_IRQ, 328 .pci_irq_fixup = maple_pci_irq_fixup, 329 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq, 330 .restart = maple_restart, 331 .power_off = maple_power_off, 332 .halt = maple_halt, 333 .get_boot_time = maple_get_boot_time, 334 .set_rtc_time = maple_set_rtc_time, 335 .get_rtc_time = maple_get_rtc_time, 336 .calibrate_decr = generic_calibrate_decr, 337 .progress = maple_progress, 338 .power_save = power4_idle, 339 #ifdef CONFIG_KEXEC 340 .machine_kexec = default_machine_kexec, 341 .machine_kexec_prepare = default_machine_kexec_prepare, 342 .machine_crash_shutdown = default_machine_crash_shutdown, 343 #endif 344 }; 345