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/tty.h> 27 #include <linux/string.h> 28 #include <linux/delay.h> 29 #include <linux/ioport.h> 30 #include <linux/major.h> 31 #include <linux/initrd.h> 32 #include <linux/vt_kern.h> 33 #include <linux/console.h> 34 #include <linux/pci.h> 35 #include <linux/adb.h> 36 #include <linux/cuda.h> 37 #include <linux/pmu.h> 38 #include <linux/irq.h> 39 #include <linux/seq_file.h> 40 #include <linux/root_dev.h> 41 #include <linux/serial.h> 42 #include <linux/smp.h> 43 #include <linux/bitops.h> 44 #include <linux/of_device.h> 45 #include <linux/lmb.h> 46 47 #include <asm/processor.h> 48 #include <asm/sections.h> 49 #include <asm/prom.h> 50 #include <asm/system.h> 51 #include <asm/pgtable.h> 52 #include <asm/io.h> 53 #include <asm/kexec.h> 54 #include <asm/pci-bridge.h> 55 #include <asm/iommu.h> 56 #include <asm/machdep.h> 57 #include <asm/dma.h> 58 #include <asm/cputable.h> 59 #include <asm/time.h> 60 #include <asm/mpic.h> 61 #include <asm/rtas.h> 62 #include <asm/udbg.h> 63 #include <asm/nvram.h> 64 65 #include "maple.h" 66 67 #ifdef DEBUG 68 #define DBG(fmt...) udbg_printf(fmt) 69 #else 70 #define DBG(fmt...) 71 #endif 72 73 static unsigned long maple_find_nvram_base(void) 74 { 75 struct device_node *rtcs; 76 unsigned long result = 0; 77 78 /* find NVRAM device */ 79 rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111"); 80 if (rtcs) { 81 struct resource r; 82 if (of_address_to_resource(rtcs, 0, &r)) { 83 printk(KERN_EMERG "Maple: Unable to translate NVRAM" 84 " address\n"); 85 goto bail; 86 } 87 if (!(r.flags & IORESOURCE_IO)) { 88 printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n"); 89 goto bail; 90 } 91 result = r.start; 92 } else 93 printk(KERN_EMERG "Maple: Unable to find NVRAM\n"); 94 bail: 95 of_node_put(rtcs); 96 return result; 97 } 98 99 static void maple_restart(char *cmd) 100 { 101 unsigned int maple_nvram_base; 102 const unsigned int *maple_nvram_offset, *maple_nvram_command; 103 struct device_node *sp; 104 105 maple_nvram_base = maple_find_nvram_base(); 106 if (maple_nvram_base == 0) 107 goto fail; 108 109 /* find service processor device */ 110 sp = of_find_node_by_name(NULL, "service-processor"); 111 if (!sp) { 112 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 113 goto fail; 114 } 115 maple_nvram_offset = of_get_property(sp, "restart-addr", NULL); 116 maple_nvram_command = of_get_property(sp, "restart-value", NULL); 117 of_node_put(sp); 118 119 /* send command */ 120 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 121 for (;;) ; 122 fail: 123 printk(KERN_EMERG "Maple: Manual Restart Required\n"); 124 } 125 126 static void maple_power_off(void) 127 { 128 unsigned int maple_nvram_base; 129 const unsigned int *maple_nvram_offset, *maple_nvram_command; 130 struct device_node *sp; 131 132 maple_nvram_base = maple_find_nvram_base(); 133 if (maple_nvram_base == 0) 134 goto fail; 135 136 /* find service processor device */ 137 sp = of_find_node_by_name(NULL, "service-processor"); 138 if (!sp) { 139 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 140 goto fail; 141 } 142 maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL); 143 maple_nvram_command = of_get_property(sp, "power-off-value", NULL); 144 of_node_put(sp); 145 146 /* send command */ 147 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 148 for (;;) ; 149 fail: 150 printk(KERN_EMERG "Maple: Manual Power-Down Required\n"); 151 } 152 153 static void maple_halt(void) 154 { 155 maple_power_off(); 156 } 157 158 #ifdef CONFIG_SMP 159 struct smp_ops_t maple_smp_ops = { 160 .probe = smp_mpic_probe, 161 .message_pass = smp_mpic_message_pass, 162 .kick_cpu = smp_generic_kick_cpu, 163 .setup_cpu = smp_mpic_setup_cpu, 164 .give_timebase = smp_generic_give_timebase, 165 .take_timebase = smp_generic_take_timebase, 166 }; 167 #endif /* CONFIG_SMP */ 168 169 static void __init maple_use_rtas_reboot_and_halt_if_present(void) 170 { 171 if (rtas_service_present("system-reboot") && 172 rtas_service_present("power-off")) { 173 ppc_md.restart = rtas_restart; 174 ppc_md.power_off = rtas_power_off; 175 ppc_md.halt = rtas_halt; 176 } 177 } 178 179 void __init maple_setup_arch(void) 180 { 181 /* init to some ~sane value until calibrate_delay() runs */ 182 loops_per_jiffy = 50000000; 183 184 /* Setup SMP callback */ 185 #ifdef CONFIG_SMP 186 smp_ops = &maple_smp_ops; 187 #endif 188 /* Lookup PCI hosts */ 189 maple_pci_init(); 190 191 #ifdef CONFIG_DUMMY_CONSOLE 192 conswitchp = &dummy_con; 193 #endif 194 maple_use_rtas_reboot_and_halt_if_present(); 195 196 printk(KERN_DEBUG "Using native/NAP idle loop\n"); 197 198 mmio_nvram_init(); 199 } 200 201 /* 202 * Early initialization. 203 */ 204 static void __init maple_init_early(void) 205 { 206 DBG(" -> maple_init_early\n"); 207 208 iommu_init_early_dart(); 209 210 DBG(" <- maple_init_early\n"); 211 } 212 213 /* 214 * This is almost identical to pSeries and CHRP. We need to make that 215 * code generic at one point, with appropriate bits in the device-tree to 216 * identify the presence of an HT APIC 217 */ 218 static void __init maple_init_IRQ(void) 219 { 220 struct device_node *root, *np, *mpic_node = NULL; 221 const unsigned int *opprop; 222 unsigned long openpic_addr = 0; 223 int naddr, n, i, opplen, has_isus = 0; 224 struct mpic *mpic; 225 unsigned int flags = MPIC_PRIMARY; 226 227 /* Locate MPIC in the device-tree. Note that there is a bug 228 * in Maple device-tree where the type of the controller is 229 * open-pic and not interrupt-controller 230 */ 231 232 for_each_node_by_type(np, "interrupt-controller") 233 if (of_device_is_compatible(np, "open-pic")) { 234 mpic_node = np; 235 break; 236 } 237 if (mpic_node == NULL) 238 for_each_node_by_type(np, "open-pic") { 239 mpic_node = np; 240 break; 241 } 242 if (mpic_node == NULL) { 243 printk(KERN_ERR 244 "Failed to locate the MPIC interrupt controller\n"); 245 return; 246 } 247 248 /* Find address list in /platform-open-pic */ 249 root = of_find_node_by_path("/"); 250 naddr = of_n_addr_cells(root); 251 opprop = of_get_property(root, "platform-open-pic", &opplen); 252 if (opprop != 0) { 253 openpic_addr = of_read_number(opprop, naddr); 254 has_isus = (opplen > naddr); 255 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n", 256 openpic_addr, has_isus); 257 } 258 259 BUG_ON(openpic_addr == 0); 260 261 /* Check for a big endian MPIC */ 262 if (of_get_property(np, "big-endian", NULL) != NULL) 263 flags |= MPIC_BIG_ENDIAN; 264 265 /* XXX Maple specific bits */ 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 } 291 292 static 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 */ 301 static 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 } 320 321 define_machine(maple) { 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