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