1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Maple (970 eval board) setup code 4 * 5 * (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org), 6 * IBM Corp. 7 */ 8 9 #undef DEBUG 10 11 #include <linux/init.h> 12 #include <linux/errno.h> 13 #include <linux/sched.h> 14 #include <linux/kernel.h> 15 #include <linux/export.h> 16 #include <linux/mm.h> 17 #include <linux/stddef.h> 18 #include <linux/unistd.h> 19 #include <linux/ptrace.h> 20 #include <linux/user.h> 21 #include <linux/tty.h> 22 #include <linux/string.h> 23 #include <linux/delay.h> 24 #include <linux/ioport.h> 25 #include <linux/major.h> 26 #include <linux/initrd.h> 27 #include <linux/vt_kern.h> 28 #include <linux/console.h> 29 #include <linux/pci.h> 30 #include <linux/adb.h> 31 #include <linux/cuda.h> 32 #include <linux/pmu.h> 33 #include <linux/irq.h> 34 #include <linux/seq_file.h> 35 #include <linux/root_dev.h> 36 #include <linux/serial.h> 37 #include <linux/smp.h> 38 #include <linux/bitops.h> 39 #include <linux/of_device.h> 40 #include <linux/memblock.h> 41 42 #include <asm/processor.h> 43 #include <asm/sections.h> 44 #include <asm/prom.h> 45 #include <asm/pgtable.h> 46 #include <asm/io.h> 47 #include <asm/pci-bridge.h> 48 #include <asm/iommu.h> 49 #include <asm/machdep.h> 50 #include <asm/dma.h> 51 #include <asm/cputable.h> 52 #include <asm/time.h> 53 #include <asm/mpic.h> 54 #include <asm/rtas.h> 55 #include <asm/udbg.h> 56 #include <asm/nvram.h> 57 58 #include "maple.h" 59 60 #ifdef DEBUG 61 #define DBG(fmt...) udbg_printf(fmt) 62 #else 63 #define DBG(fmt...) 64 #endif 65 66 static unsigned long maple_find_nvram_base(void) 67 { 68 struct device_node *rtcs; 69 unsigned long result = 0; 70 71 /* find NVRAM device */ 72 rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111"); 73 if (rtcs) { 74 struct resource r; 75 if (of_address_to_resource(rtcs, 0, &r)) { 76 printk(KERN_EMERG "Maple: Unable to translate NVRAM" 77 " address\n"); 78 goto bail; 79 } 80 if (!(r.flags & IORESOURCE_IO)) { 81 printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n"); 82 goto bail; 83 } 84 result = r.start; 85 } else 86 printk(KERN_EMERG "Maple: Unable to find NVRAM\n"); 87 bail: 88 of_node_put(rtcs); 89 return result; 90 } 91 92 static void __noreturn maple_restart(char *cmd) 93 { 94 unsigned int maple_nvram_base; 95 const unsigned int *maple_nvram_offset, *maple_nvram_command; 96 struct device_node *sp; 97 98 maple_nvram_base = maple_find_nvram_base(); 99 if (maple_nvram_base == 0) 100 goto fail; 101 102 /* find service processor device */ 103 sp = of_find_node_by_name(NULL, "service-processor"); 104 if (!sp) { 105 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 106 goto fail; 107 } 108 maple_nvram_offset = of_get_property(sp, "restart-addr", NULL); 109 maple_nvram_command = of_get_property(sp, "restart-value", NULL); 110 of_node_put(sp); 111 112 /* send command */ 113 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 114 for (;;) ; 115 fail: 116 printk(KERN_EMERG "Maple: Manual Restart Required\n"); 117 for (;;) ; 118 } 119 120 static void __noreturn maple_power_off(void) 121 { 122 unsigned int maple_nvram_base; 123 const unsigned int *maple_nvram_offset, *maple_nvram_command; 124 struct device_node *sp; 125 126 maple_nvram_base = maple_find_nvram_base(); 127 if (maple_nvram_base == 0) 128 goto fail; 129 130 /* find service processor device */ 131 sp = of_find_node_by_name(NULL, "service-processor"); 132 if (!sp) { 133 printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); 134 goto fail; 135 } 136 maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL); 137 maple_nvram_command = of_get_property(sp, "power-off-value", NULL); 138 of_node_put(sp); 139 140 /* send command */ 141 outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); 142 for (;;) ; 143 fail: 144 printk(KERN_EMERG "Maple: Manual Power-Down Required\n"); 145 for (;;) ; 146 } 147 148 static void __noreturn maple_halt(void) 149 { 150 maple_power_off(); 151 } 152 153 #ifdef CONFIG_SMP 154 static struct smp_ops_t maple_smp_ops = { 155 .probe = smp_mpic_probe, 156 .message_pass = smp_mpic_message_pass, 157 .kick_cpu = smp_generic_kick_cpu, 158 .setup_cpu = smp_mpic_setup_cpu, 159 .give_timebase = smp_generic_give_timebase, 160 .take_timebase = smp_generic_take_timebase, 161 }; 162 #endif /* CONFIG_SMP */ 163 164 static void __init maple_use_rtas_reboot_and_halt_if_present(void) 165 { 166 if (rtas_service_present("system-reboot") && 167 rtas_service_present("power-off")) { 168 ppc_md.restart = rtas_restart; 169 pm_power_off = rtas_power_off; 170 ppc_md.halt = rtas_halt; 171 } 172 } 173 174 static void __init maple_setup_arch(void) 175 { 176 /* init to some ~sane value until calibrate_delay() runs */ 177 loops_per_jiffy = 50000000; 178 179 /* Setup SMP callback */ 180 #ifdef CONFIG_SMP 181 smp_ops = &maple_smp_ops; 182 #endif 183 /* Lookup PCI hosts */ 184 maple_pci_init(); 185 186 maple_use_rtas_reboot_and_halt_if_present(); 187 188 printk(KERN_DEBUG "Using native/NAP idle loop\n"); 189 190 mmio_nvram_init(); 191 } 192 193 /* 194 * This is almost identical to pSeries and CHRP. We need to make that 195 * code generic at one point, with appropriate bits in the device-tree to 196 * identify the presence of an HT APIC 197 */ 198 static void __init maple_init_IRQ(void) 199 { 200 struct device_node *root, *np, *mpic_node = NULL; 201 const unsigned int *opprop; 202 unsigned long openpic_addr = 0; 203 int naddr, n, i, opplen, has_isus = 0; 204 struct mpic *mpic; 205 unsigned int flags = 0; 206 207 /* Locate MPIC in the device-tree. Note that there is a bug 208 * in Maple device-tree where the type of the controller is 209 * open-pic and not interrupt-controller 210 */ 211 212 for_each_node_by_type(np, "interrupt-controller") 213 if (of_device_is_compatible(np, "open-pic")) { 214 mpic_node = np; 215 break; 216 } 217 if (mpic_node == NULL) 218 for_each_node_by_type(np, "open-pic") { 219 mpic_node = np; 220 break; 221 } 222 if (mpic_node == NULL) { 223 printk(KERN_ERR 224 "Failed to locate the MPIC interrupt controller\n"); 225 return; 226 } 227 228 /* Find address list in /platform-open-pic */ 229 root = of_find_node_by_path("/"); 230 naddr = of_n_addr_cells(root); 231 opprop = of_get_property(root, "platform-open-pic", &opplen); 232 if (opprop) { 233 openpic_addr = of_read_number(opprop, naddr); 234 has_isus = (opplen > naddr); 235 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n", 236 openpic_addr, has_isus); 237 } 238 239 BUG_ON(openpic_addr == 0); 240 241 /* Check for a big endian MPIC */ 242 if (of_get_property(np, "big-endian", NULL) != NULL) 243 flags |= MPIC_BIG_ENDIAN; 244 245 /* XXX Maple specific bits */ 246 flags |= MPIC_U3_HT_IRQS; 247 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */ 248 flags |= MPIC_BIG_ENDIAN; 249 250 /* Setup the openpic driver. More device-tree junks, we hard code no 251 * ISUs for now. I'll have to revisit some stuffs with the folks doing 252 * the firmware for those 253 */ 254 mpic = mpic_alloc(mpic_node, openpic_addr, flags, 255 /*has_isus ? 16 :*/ 0, 0, " MPIC "); 256 BUG_ON(mpic == NULL); 257 258 /* Add ISUs */ 259 opplen /= sizeof(u32); 260 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 261 unsigned long isuaddr = of_read_number(opprop + i, naddr); 262 mpic_assign_isu(mpic, n, isuaddr); 263 } 264 265 /* All ISUs are setup, complete initialization */ 266 mpic_init(mpic); 267 ppc_md.get_irq = mpic_get_irq; 268 of_node_put(mpic_node); 269 of_node_put(root); 270 } 271 272 static void __init maple_progress(char *s, unsigned short hex) 273 { 274 printk("*** %04x : %s\n", hex, s ? s : ""); 275 } 276 277 278 /* 279 * Called very early, MMU is off, device-tree isn't unflattened 280 */ 281 static int __init maple_probe(void) 282 { 283 if (!of_machine_is_compatible("Momentum,Maple") && 284 !of_machine_is_compatible("Momentum,Apache")) 285 return 0; 286 287 pm_power_off = maple_power_off; 288 289 iommu_init_early_dart(&maple_pci_controller_ops); 290 291 return 1; 292 } 293 294 define_machine(maple) { 295 .name = "Maple", 296 .probe = maple_probe, 297 .setup_arch = maple_setup_arch, 298 .init_IRQ = maple_init_IRQ, 299 .pci_irq_fixup = maple_pci_irq_fixup, 300 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq, 301 .restart = maple_restart, 302 .halt = maple_halt, 303 .get_boot_time = maple_get_boot_time, 304 .set_rtc_time = maple_set_rtc_time, 305 .get_rtc_time = maple_get_rtc_time, 306 .calibrate_decr = generic_calibrate_decr, 307 .progress = maple_progress, 308 .power_save = power4_idle, 309 }; 310 311 #ifdef CONFIG_EDAC 312 /* 313 * Register a platform device for CPC925 memory controller on 314 * all boards with U3H (CPC925) bridge. 315 */ 316 static int __init maple_cpc925_edac_setup(void) 317 { 318 struct platform_device *pdev; 319 struct device_node *np = NULL; 320 struct resource r; 321 int ret; 322 volatile void __iomem *mem; 323 u32 rev; 324 325 np = of_find_node_by_type(NULL, "memory-controller"); 326 if (!np) { 327 printk(KERN_ERR "%s: Unable to find memory-controller node\n", 328 __func__); 329 return -ENODEV; 330 } 331 332 ret = of_address_to_resource(np, 0, &r); 333 of_node_put(np); 334 335 if (ret < 0) { 336 printk(KERN_ERR "%s: Unable to get memory-controller reg\n", 337 __func__); 338 return -ENODEV; 339 } 340 341 mem = ioremap(r.start, resource_size(&r)); 342 if (!mem) { 343 printk(KERN_ERR "%s: Unable to map memory-controller memory\n", 344 __func__); 345 return -ENOMEM; 346 } 347 348 rev = __raw_readl(mem); 349 iounmap(mem); 350 351 if (rev < 0x34 || rev > 0x3f) { /* U3H */ 352 printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n", 353 __func__, rev); 354 return 0; 355 } 356 357 pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1); 358 if (IS_ERR(pdev)) 359 return PTR_ERR(pdev); 360 361 printk(KERN_INFO "%s: CPC925 platform device created\n", __func__); 362 363 return 0; 364 } 365 machine_device_initcall(maple, maple_cpc925_edac_setup); 366 #endif 367