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 __noreturn 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 for (;;) ; 123 } 124 125 static void __noreturn maple_power_off(void) 126 { 127 unsigned int maple_nvram_base; 128 const unsigned int *maple_nvram_offset, *maple_nvram_command; 129 struct device_node *sp; 130 131 maple_nvram_base = maple_find_nvram_base(); 132 if (maple_nvram_base == 0) 133 goto fail; 134 135 /* find service processor device */ 136 sp = of_find_node_by_name(NULL, "service-processor"); 137 if (!sp) { 138 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 139 goto fail; 140 } 141 maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL); 142 maple_nvram_command = of_get_property(sp, "power-off-value", NULL); 143 of_node_put(sp); 144 145 /* send command */ 146 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 147 for (;;) ; 148 fail: 149 printk(KERN_EMERG "Maple: Manual Power-Down Required\n"); 150 for (;;) ; 151 } 152 153 static void __noreturn maple_halt(void) 154 { 155 maple_power_off(); 156 } 157 158 #ifdef CONFIG_SMP 159 static 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 pm_power_off = rtas_power_off; 175 ppc_md.halt = rtas_halt; 176 } 177 } 178 179 static 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 * This is almost identical to pSeries and CHRP. We need to make that 203 * code generic at one point, with appropriate bits in the device-tree to 204 * identify the presence of an HT APIC 205 */ 206 static void __init maple_init_IRQ(void) 207 { 208 struct device_node *root, *np, *mpic_node = NULL; 209 const unsigned int *opprop; 210 unsigned long openpic_addr = 0; 211 int naddr, n, i, opplen, has_isus = 0; 212 struct mpic *mpic; 213 unsigned int flags = 0; 214 215 /* Locate MPIC in the device-tree. Note that there is a bug 216 * in Maple device-tree where the type of the controller is 217 * open-pic and not interrupt-controller 218 */ 219 220 for_each_node_by_type(np, "interrupt-controller") 221 if (of_device_is_compatible(np, "open-pic")) { 222 mpic_node = np; 223 break; 224 } 225 if (mpic_node == NULL) 226 for_each_node_by_type(np, "open-pic") { 227 mpic_node = np; 228 break; 229 } 230 if (mpic_node == NULL) { 231 printk(KERN_ERR 232 "Failed to locate the MPIC interrupt controller\n"); 233 return; 234 } 235 236 /* Find address list in /platform-open-pic */ 237 root = of_find_node_by_path("/"); 238 naddr = of_n_addr_cells(root); 239 opprop = of_get_property(root, "platform-open-pic", &opplen); 240 if (opprop != 0) { 241 openpic_addr = of_read_number(opprop, naddr); 242 has_isus = (opplen > naddr); 243 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n", 244 openpic_addr, has_isus); 245 } 246 247 BUG_ON(openpic_addr == 0); 248 249 /* Check for a big endian MPIC */ 250 if (of_get_property(np, "big-endian", NULL) != NULL) 251 flags |= MPIC_BIG_ENDIAN; 252 253 /* XXX Maple specific bits */ 254 flags |= MPIC_U3_HT_IRQS; 255 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */ 256 flags |= MPIC_BIG_ENDIAN; 257 258 /* Setup the openpic driver. More device-tree junks, we hard code no 259 * ISUs for now. I'll have to revisit some stuffs with the folks doing 260 * the firmware for those 261 */ 262 mpic = mpic_alloc(mpic_node, openpic_addr, flags, 263 /*has_isus ? 16 :*/ 0, 0, " MPIC "); 264 BUG_ON(mpic == NULL); 265 266 /* Add ISUs */ 267 opplen /= sizeof(u32); 268 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 269 unsigned long isuaddr = of_read_number(opprop + i, naddr); 270 mpic_assign_isu(mpic, n, isuaddr); 271 } 272 273 /* All ISUs are setup, complete initialization */ 274 mpic_init(mpic); 275 ppc_md.get_irq = mpic_get_irq; 276 of_node_put(mpic_node); 277 of_node_put(root); 278 } 279 280 static void __init maple_progress(char *s, unsigned short hex) 281 { 282 printk("*** %04x : %s\n", hex, s ? s : ""); 283 } 284 285 286 /* 287 * Called very early, MMU is off, device-tree isn't unflattened 288 */ 289 static int __init maple_probe(void) 290 { 291 if (!of_machine_is_compatible("Momentum,Maple") && 292 !of_machine_is_compatible("Momentum,Apache")) 293 return 0; 294 295 pm_power_off = maple_power_off; 296 297 iommu_init_early_dart(&maple_pci_controller_ops); 298 299 return 1; 300 } 301 302 define_machine(maple) { 303 .name = "Maple", 304 .probe = maple_probe, 305 .setup_arch = maple_setup_arch, 306 .init_IRQ = maple_init_IRQ, 307 .pci_irq_fixup = maple_pci_irq_fixup, 308 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq, 309 .restart = maple_restart, 310 .halt = maple_halt, 311 .get_boot_time = maple_get_boot_time, 312 .set_rtc_time = maple_set_rtc_time, 313 .get_rtc_time = maple_get_rtc_time, 314 .calibrate_decr = generic_calibrate_decr, 315 .progress = maple_progress, 316 .power_save = power4_idle, 317 }; 318 319 #ifdef CONFIG_EDAC 320 /* 321 * Register a platform device for CPC925 memory controller on 322 * all boards with U3H (CPC925) bridge. 323 */ 324 static int __init maple_cpc925_edac_setup(void) 325 { 326 struct platform_device *pdev; 327 struct device_node *np = NULL; 328 struct resource r; 329 int ret; 330 volatile void __iomem *mem; 331 u32 rev; 332 333 np = of_find_node_by_type(NULL, "memory-controller"); 334 if (!np) { 335 printk(KERN_ERR "%s: Unable to find memory-controller node\n", 336 __func__); 337 return -ENODEV; 338 } 339 340 ret = of_address_to_resource(np, 0, &r); 341 of_node_put(np); 342 343 if (ret < 0) { 344 printk(KERN_ERR "%s: Unable to get memory-controller reg\n", 345 __func__); 346 return -ENODEV; 347 } 348 349 mem = ioremap(r.start, resource_size(&r)); 350 if (!mem) { 351 printk(KERN_ERR "%s: Unable to map memory-controller memory\n", 352 __func__); 353 return -ENOMEM; 354 } 355 356 rev = __raw_readl(mem); 357 iounmap(mem); 358 359 if (rev < 0x34 || rev > 0x3f) { /* U3H */ 360 printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n", 361 __func__, rev); 362 return 0; 363 } 364 365 pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1); 366 if (IS_ERR(pdev)) 367 return PTR_ERR(pdev); 368 369 printk(KERN_INFO "%s: CPC925 platform device created\n", __func__); 370 371 return 0; 372 } 373 machine_device_initcall(maple, maple_cpc925_edac_setup); 374 #endif 375