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/export.h> 21 #include <linux/mm.h> 22 #include <linux/stddef.h> 23 #include <linux/unistd.h> 24 #include <linux/ptrace.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/memblock.h> 46 47 #include <asm/processor.h> 48 #include <asm/sections.h> 49 #include <asm/prom.h> 50 #include <asm/pgtable.h> 51 #include <asm/io.h> 52 #include <asm/pci-bridge.h> 53 #include <asm/iommu.h> 54 #include <asm/machdep.h> 55 #include <asm/dma.h> 56 #include <asm/cputable.h> 57 #include <asm/time.h> 58 #include <asm/mpic.h> 59 #include <asm/rtas.h> 60 #include <asm/udbg.h> 61 #include <asm/nvram.h> 62 63 #include "maple.h" 64 65 #ifdef DEBUG 66 #define DBG(fmt...) udbg_printf(fmt) 67 #else 68 #define DBG(fmt...) 69 #endif 70 71 static unsigned long maple_find_nvram_base(void) 72 { 73 struct device_node *rtcs; 74 unsigned long result = 0; 75 76 /* find NVRAM device */ 77 rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111"); 78 if (rtcs) { 79 struct resource r; 80 if (of_address_to_resource(rtcs, 0, &r)) { 81 printk(KERN_EMERG "Maple: Unable to translate NVRAM" 82 " address\n"); 83 goto bail; 84 } 85 if (!(r.flags & IORESOURCE_IO)) { 86 printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n"); 87 goto bail; 88 } 89 result = r.start; 90 } else 91 printk(KERN_EMERG "Maple: Unable to find NVRAM\n"); 92 bail: 93 of_node_put(rtcs); 94 return result; 95 } 96 97 static void maple_restart(char *cmd) 98 { 99 unsigned int maple_nvram_base; 100 const unsigned int *maple_nvram_offset, *maple_nvram_command; 101 struct device_node *sp; 102 103 maple_nvram_base = maple_find_nvram_base(); 104 if (maple_nvram_base == 0) 105 goto fail; 106 107 /* find service processor device */ 108 sp = of_find_node_by_name(NULL, "service-processor"); 109 if (!sp) { 110 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 111 goto fail; 112 } 113 maple_nvram_offset = of_get_property(sp, "restart-addr", NULL); 114 maple_nvram_command = of_get_property(sp, "restart-value", NULL); 115 of_node_put(sp); 116 117 /* send command */ 118 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 119 for (;;) ; 120 fail: 121 printk(KERN_EMERG "Maple: Manual Restart Required\n"); 122 } 123 124 static void maple_power_off(void) 125 { 126 unsigned int maple_nvram_base; 127 const unsigned int *maple_nvram_offset, *maple_nvram_command; 128 struct device_node *sp; 129 130 maple_nvram_base = maple_find_nvram_base(); 131 if (maple_nvram_base == 0) 132 goto fail; 133 134 /* find service processor device */ 135 sp = of_find_node_by_name(NULL, "service-processor"); 136 if (!sp) { 137 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 138 goto fail; 139 } 140 maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL); 141 maple_nvram_command = of_get_property(sp, "power-off-value", NULL); 142 of_node_put(sp); 143 144 /* send command */ 145 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 146 for (;;) ; 147 fail: 148 printk(KERN_EMERG "Maple: Manual Power-Down Required\n"); 149 } 150 151 static void maple_halt(void) 152 { 153 maple_power_off(); 154 } 155 156 #ifdef CONFIG_SMP 157 struct smp_ops_t maple_smp_ops = { 158 .probe = smp_mpic_probe, 159 .message_pass = smp_mpic_message_pass, 160 .kick_cpu = smp_generic_kick_cpu, 161 .setup_cpu = smp_mpic_setup_cpu, 162 .give_timebase = smp_generic_give_timebase, 163 .take_timebase = smp_generic_take_timebase, 164 }; 165 #endif /* CONFIG_SMP */ 166 167 static void __init maple_use_rtas_reboot_and_halt_if_present(void) 168 { 169 if (rtas_service_present("system-reboot") && 170 rtas_service_present("power-off")) { 171 ppc_md.restart = rtas_restart; 172 ppc_md.power_off = rtas_power_off; 173 ppc_md.halt = rtas_halt; 174 } 175 } 176 177 void __init maple_setup_arch(void) 178 { 179 /* init to some ~sane value until calibrate_delay() runs */ 180 loops_per_jiffy = 50000000; 181 182 /* Setup SMP callback */ 183 #ifdef CONFIG_SMP 184 smp_ops = &maple_smp_ops; 185 #endif 186 /* Lookup PCI hosts */ 187 maple_pci_init(); 188 189 #ifdef CONFIG_DUMMY_CONSOLE 190 conswitchp = &dummy_con; 191 #endif 192 maple_use_rtas_reboot_and_halt_if_present(); 193 194 printk(KERN_DEBUG "Using native/NAP idle loop\n"); 195 196 mmio_nvram_init(); 197 } 198 199 /* 200 * Early initialization. 201 */ 202 static void __init maple_init_early(void) 203 { 204 DBG(" -> maple_init_early\n"); 205 206 iommu_init_early_dart(); 207 208 DBG(" <- maple_init_early\n"); 209 } 210 211 /* 212 * This is almost identical to pSeries and CHRP. We need to make that 213 * code generic at one point, with appropriate bits in the device-tree to 214 * identify the presence of an HT APIC 215 */ 216 static void __init maple_init_IRQ(void) 217 { 218 struct device_node *root, *np, *mpic_node = NULL; 219 const unsigned int *opprop; 220 unsigned long openpic_addr = 0; 221 int naddr, n, i, opplen, has_isus = 0; 222 struct mpic *mpic; 223 unsigned int flags = 0; 224 225 /* Locate MPIC in the device-tree. Note that there is a bug 226 * in Maple device-tree where the type of the controller is 227 * open-pic and not interrupt-controller 228 */ 229 230 for_each_node_by_type(np, "interrupt-controller") 231 if (of_device_is_compatible(np, "open-pic")) { 232 mpic_node = np; 233 break; 234 } 235 if (mpic_node == NULL) 236 for_each_node_by_type(np, "open-pic") { 237 mpic_node = np; 238 break; 239 } 240 if (mpic_node == NULL) { 241 printk(KERN_ERR 242 "Failed to locate the MPIC interrupt controller\n"); 243 return; 244 } 245 246 /* Find address list in /platform-open-pic */ 247 root = of_find_node_by_path("/"); 248 naddr = of_n_addr_cells(root); 249 opprop = of_get_property(root, "platform-open-pic", &opplen); 250 if (opprop != 0) { 251 openpic_addr = of_read_number(opprop, naddr); 252 has_isus = (opplen > naddr); 253 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n", 254 openpic_addr, has_isus); 255 } 256 257 BUG_ON(openpic_addr == 0); 258 259 /* Check for a big endian MPIC */ 260 if (of_get_property(np, "big-endian", NULL) != NULL) 261 flags |= MPIC_BIG_ENDIAN; 262 263 /* XXX Maple specific bits */ 264 flags |= MPIC_U3_HT_IRQS; 265 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */ 266 flags |= MPIC_BIG_ENDIAN; 267 268 /* Setup the openpic driver. More device-tree junks, we hard code no 269 * ISUs for now. I'll have to revisit some stuffs with the folks doing 270 * the firmware for those 271 */ 272 mpic = mpic_alloc(mpic_node, openpic_addr, flags, 273 /*has_isus ? 16 :*/ 0, 0, " MPIC "); 274 BUG_ON(mpic == NULL); 275 276 /* Add ISUs */ 277 opplen /= sizeof(u32); 278 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 279 unsigned long isuaddr = of_read_number(opprop + i, naddr); 280 mpic_assign_isu(mpic, n, isuaddr); 281 } 282 283 /* All ISUs are setup, complete initialization */ 284 mpic_init(mpic); 285 ppc_md.get_irq = mpic_get_irq; 286 of_node_put(mpic_node); 287 of_node_put(root); 288 } 289 290 static void __init maple_progress(char *s, unsigned short hex) 291 { 292 printk("*** %04x : %s\n", hex, s ? s : ""); 293 } 294 295 296 /* 297 * Called very early, MMU is off, device-tree isn't unflattened 298 */ 299 static int __init maple_probe(void) 300 { 301 unsigned long root = of_get_flat_dt_root(); 302 303 if (!of_flat_dt_is_compatible(root, "Momentum,Maple") && 304 !of_flat_dt_is_compatible(root, "Momentum,Apache")) 305 return 0; 306 /* 307 * On U3, the DART (iommu) must be allocated now since it 308 * has an impact on htab_initialize (due to the large page it 309 * occupies having to be broken up so the DART itself is not 310 * part of the cacheable linar mapping 311 */ 312 alloc_dart_table(); 313 314 hpte_init_native(); 315 316 return 1; 317 } 318 319 define_machine(maple) { 320 .name = "Maple", 321 .probe = maple_probe, 322 .setup_arch = maple_setup_arch, 323 .init_early = maple_init_early, 324 .init_IRQ = maple_init_IRQ, 325 .pci_irq_fixup = maple_pci_irq_fixup, 326 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq, 327 .restart = maple_restart, 328 .power_off = maple_power_off, 329 .halt = maple_halt, 330 .get_boot_time = maple_get_boot_time, 331 .set_rtc_time = maple_set_rtc_time, 332 .get_rtc_time = maple_get_rtc_time, 333 .calibrate_decr = generic_calibrate_decr, 334 .progress = maple_progress, 335 .power_save = power4_idle, 336 }; 337 338 #ifdef CONFIG_EDAC 339 /* 340 * Register a platform device for CPC925 memory controller on 341 * all boards with U3H (CPC925) bridge. 342 */ 343 static int __init maple_cpc925_edac_setup(void) 344 { 345 struct platform_device *pdev; 346 struct device_node *np = NULL; 347 struct resource r; 348 int ret; 349 volatile void __iomem *mem; 350 u32 rev; 351 352 np = of_find_node_by_type(NULL, "memory-controller"); 353 if (!np) { 354 printk(KERN_ERR "%s: Unable to find memory-controller node\n", 355 __func__); 356 return -ENODEV; 357 } 358 359 ret = of_address_to_resource(np, 0, &r); 360 of_node_put(np); 361 362 if (ret < 0) { 363 printk(KERN_ERR "%s: Unable to get memory-controller reg\n", 364 __func__); 365 return -ENODEV; 366 } 367 368 mem = ioremap(r.start, resource_size(&r)); 369 if (!mem) { 370 printk(KERN_ERR "%s: Unable to map memory-controller memory\n", 371 __func__); 372 return -ENOMEM; 373 } 374 375 rev = __raw_readl(mem); 376 iounmap(mem); 377 378 if (rev < 0x34 || rev > 0x3f) { /* U3H */ 379 printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n", 380 __func__, rev); 381 return 0; 382 } 383 384 pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1); 385 if (IS_ERR(pdev)) 386 return PTR_ERR(pdev); 387 388 printk(KERN_INFO "%s: CPC925 platform device created\n", __func__); 389 390 return 0; 391 } 392 machine_device_initcall(maple, maple_cpc925_edac_setup); 393 #endif 394