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_address.h> 40 #include <linux/of_device.h> 41 #include <linux/memblock.h> 42 43 #include <asm/processor.h> 44 #include <asm/sections.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_function_implemented(RTAS_FN_SYSTEM_REBOOT) && 166 rtas_function_implemented(RTAS_FN_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 maple_use_rtas_reboot_and_halt_if_present(); 183 184 printk(KERN_DEBUG "Using native/NAP idle loop\n"); 185 186 mmio_nvram_init(); 187 } 188 189 /* 190 * This is almost identical to pSeries and CHRP. We need to make that 191 * code generic at one point, with appropriate bits in the device-tree to 192 * identify the presence of an HT APIC 193 */ 194 static void __init maple_init_IRQ(void) 195 { 196 struct device_node *root, *np, *mpic_node = NULL; 197 const unsigned int *opprop; 198 unsigned long openpic_addr = 0; 199 int naddr, n, i, opplen, has_isus = 0; 200 struct mpic *mpic; 201 unsigned int flags = 0; 202 203 /* Locate MPIC in the device-tree. Note that there is a bug 204 * in Maple device-tree where the type of the controller is 205 * open-pic and not interrupt-controller 206 */ 207 208 for_each_node_by_type(np, "interrupt-controller") 209 if (of_device_is_compatible(np, "open-pic")) { 210 mpic_node = np; 211 break; 212 } 213 if (mpic_node == NULL) 214 for_each_node_by_type(np, "open-pic") { 215 mpic_node = np; 216 break; 217 } 218 if (mpic_node == NULL) { 219 printk(KERN_ERR 220 "Failed to locate the MPIC interrupt controller\n"); 221 return; 222 } 223 224 /* Find address list in /platform-open-pic */ 225 root = of_find_node_by_path("/"); 226 naddr = of_n_addr_cells(root); 227 opprop = of_get_property(root, "platform-open-pic", &opplen); 228 if (opprop) { 229 openpic_addr = of_read_number(opprop, naddr); 230 has_isus = (opplen > naddr); 231 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n", 232 openpic_addr, has_isus); 233 } 234 235 BUG_ON(openpic_addr == 0); 236 237 /* Check for a big endian MPIC */ 238 if (of_get_property(np, "big-endian", NULL) != NULL) 239 flags |= MPIC_BIG_ENDIAN; 240 241 /* XXX Maple specific bits */ 242 flags |= MPIC_U3_HT_IRQS; 243 /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */ 244 flags |= MPIC_BIG_ENDIAN; 245 246 /* Setup the openpic driver. More device-tree junks, we hard code no 247 * ISUs for now. I'll have to revisit some stuffs with the folks doing 248 * the firmware for those 249 */ 250 mpic = mpic_alloc(mpic_node, openpic_addr, flags, 251 /*has_isus ? 16 :*/ 0, 0, " MPIC "); 252 BUG_ON(mpic == NULL); 253 254 /* Add ISUs */ 255 opplen /= sizeof(u32); 256 for (n = 0, i = naddr; i < opplen; i += naddr, n++) { 257 unsigned long isuaddr = of_read_number(opprop + i, naddr); 258 mpic_assign_isu(mpic, n, isuaddr); 259 } 260 261 /* All ISUs are setup, complete initialization */ 262 mpic_init(mpic); 263 ppc_md.get_irq = mpic_get_irq; 264 of_node_put(mpic_node); 265 of_node_put(root); 266 } 267 268 static void __init maple_progress(char *s, unsigned short hex) 269 { 270 printk("*** %04x : %s\n", hex, s ? s : ""); 271 } 272 273 274 /* 275 * Called very early, MMU is off, device-tree isn't unflattened 276 */ 277 static int __init maple_probe(void) 278 { 279 if (!of_machine_is_compatible("Momentum,Maple") && 280 !of_machine_is_compatible("Momentum,Apache")) 281 return 0; 282 283 pm_power_off = maple_power_off; 284 285 iommu_init_early_dart(&maple_pci_controller_ops); 286 287 return 1; 288 } 289 290 #ifdef CONFIG_EDAC 291 /* 292 * Register a platform device for CPC925 memory controller on 293 * all boards with U3H (CPC925) bridge. 294 */ 295 static int __init maple_cpc925_edac_setup(void) 296 { 297 struct platform_device *pdev; 298 struct device_node *np = NULL; 299 struct resource r; 300 int ret; 301 volatile void __iomem *mem; 302 u32 rev; 303 304 np = of_find_node_by_type(NULL, "memory-controller"); 305 if (!np) { 306 printk(KERN_ERR "%s: Unable to find memory-controller node\n", 307 __func__); 308 return -ENODEV; 309 } 310 311 ret = of_address_to_resource(np, 0, &r); 312 of_node_put(np); 313 314 if (ret < 0) { 315 printk(KERN_ERR "%s: Unable to get memory-controller reg\n", 316 __func__); 317 return -ENODEV; 318 } 319 320 mem = ioremap(r.start, resource_size(&r)); 321 if (!mem) { 322 printk(KERN_ERR "%s: Unable to map memory-controller memory\n", 323 __func__); 324 return -ENOMEM; 325 } 326 327 rev = __raw_readl(mem); 328 iounmap(mem); 329 330 if (rev < 0x34 || rev > 0x3f) { /* U3H */ 331 printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n", 332 __func__, rev); 333 return 0; 334 } 335 336 pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1); 337 if (IS_ERR(pdev)) 338 return PTR_ERR(pdev); 339 340 printk(KERN_INFO "%s: CPC925 platform device created\n", __func__); 341 342 return 0; 343 } 344 machine_device_initcall(maple, maple_cpc925_edac_setup); 345 #endif 346 347 define_machine(maple) { 348 .name = "Maple", 349 .probe = maple_probe, 350 .setup_arch = maple_setup_arch, 351 .discover_phbs = maple_pci_init, 352 .init_IRQ = maple_init_IRQ, 353 .pci_irq_fixup = maple_pci_irq_fixup, 354 .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq, 355 .restart = maple_restart, 356 .halt = maple_halt, 357 .get_boot_time = maple_get_boot_time, 358 .set_rtc_time = maple_set_rtc_time, 359 .get_rtc_time = maple_get_rtc_time, 360 .calibrate_decr = generic_calibrate_decr, 361 .progress = maple_progress, 362 .power_save = power4_idle, 363 }; 364