1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Initial setup-routines for HP 9000 based hardware. 4 * 5 * Copyright (C) 1991, 1992, 1995 Linus Torvalds 6 * Modifications for PA-RISC (C) 1999 Helge Deller <deller@gmx.de> 7 * Modifications copyright 1999 SuSE GmbH (Philipp Rumpf) 8 * Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net> 9 * Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org> 10 * Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net> 11 * 12 * Initial PA-RISC Version: 04-23-1999 by Helge Deller 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/initrd.h> 17 #include <linux/init.h> 18 #include <linux/console.h> 19 #include <linux/seq_file.h> 20 #define PCI_DEBUG 21 #include <linux/pci.h> 22 #undef PCI_DEBUG 23 #include <linux/proc_fs.h> 24 #include <linux/export.h> 25 #include <linux/sched.h> 26 #include <linux/sched/clock.h> 27 #include <linux/start_kernel.h> 28 29 #include <asm/cacheflush.h> 30 #include <asm/processor.h> 31 #include <asm/sections.h> 32 #include <asm/pdc.h> 33 #include <asm/led.h> 34 #include <asm/machdep.h> /* for pa7300lc_init() proto */ 35 #include <asm/pdc_chassis.h> 36 #include <asm/io.h> 37 #include <asm/setup.h> 38 #include <asm/unwind.h> 39 #include <asm/smp.h> 40 41 static char __initdata command_line[COMMAND_LINE_SIZE]; 42 43 /* Intended for ccio/sba/cpu statistics under /proc/bus/{runway|gsc} */ 44 struct proc_dir_entry * proc_runway_root __read_mostly = NULL; 45 struct proc_dir_entry * proc_gsc_root __read_mostly = NULL; 46 struct proc_dir_entry * proc_mckinley_root __read_mostly = NULL; 47 48 static void __init setup_cmdline(char **cmdline_p) 49 { 50 extern unsigned int boot_args[]; 51 char *p; 52 53 *cmdline_p = command_line; 54 55 /* boot_args[0] is free-mem start, boot_args[1] is ptr to command line */ 56 if (boot_args[0] < 64) 57 return; /* return if called from hpux boot loader */ 58 59 /* Collect stuff passed in from the boot loader */ 60 strscpy(boot_command_line, (char *)__va(boot_args[1]), 61 COMMAND_LINE_SIZE); 62 63 /* autodetect console type (if not done by palo yet) */ 64 p = boot_command_line; 65 if (!str_has_prefix(p, "console=") && !strstr(p, " console=")) { 66 strlcat(p, " console=", COMMAND_LINE_SIZE); 67 if (PAGE0->mem_cons.cl_class == CL_DUPLEX) 68 strlcat(p, "ttyS0", COMMAND_LINE_SIZE); 69 else 70 strlcat(p, "tty0", COMMAND_LINE_SIZE); 71 } 72 73 /* default to use early console */ 74 if (!strstr(p, "earlycon")) 75 strlcat(p, " earlycon=pdc", COMMAND_LINE_SIZE); 76 77 #ifdef CONFIG_BLK_DEV_INITRD 78 /* did palo pass us a ramdisk? */ 79 if (boot_args[2] != 0) { 80 initrd_start = (unsigned long)__va(boot_args[2]); 81 initrd_end = (unsigned long)__va(boot_args[3]); 82 } 83 #endif 84 85 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 86 } 87 88 #ifdef CONFIG_PA11 89 static void __init dma_ops_init(void) 90 { 91 switch (boot_cpu_data.cpu_type) { 92 case pcx: 93 /* 94 * We've got way too many dependencies on 1.1 semantics 95 * to support 1.0 boxes at this point. 96 */ 97 panic( "PA-RISC Linux currently only supports machines that conform to\n" 98 "the PA-RISC 1.1 or 2.0 architecture specification.\n"); 99 100 case pcxl2: 101 pa7300lc_init(); 102 break; 103 default: 104 break; 105 } 106 } 107 #endif 108 109 void __init setup_arch(char **cmdline_p) 110 { 111 #ifdef CONFIG_64BIT 112 extern int parisc_narrow_firmware; 113 #endif 114 unwind_init(); 115 116 init_per_cpu(smp_processor_id()); /* Set Modes & Enable FP */ 117 118 #ifdef CONFIG_64BIT 119 printk(KERN_INFO "The 64-bit Kernel has started...\n"); 120 #else 121 printk(KERN_INFO "The 32-bit Kernel has started...\n"); 122 #endif 123 124 printk(KERN_INFO "Kernel default page size is %d KB. Huge pages ", 125 (int)(PAGE_SIZE / 1024)); 126 #ifdef CONFIG_HUGETLB_PAGE 127 printk(KERN_CONT "enabled with %d MB physical and %d MB virtual size", 128 1 << (REAL_HPAGE_SHIFT - 20), 1 << (HPAGE_SHIFT - 20)); 129 #else 130 printk(KERN_CONT "disabled"); 131 #endif 132 printk(KERN_CONT ".\n"); 133 134 /* 135 * Check if initial kernel page mappings are sufficient. 136 * panic early if not, else we may access kernel functions 137 * and variables which can't be reached. 138 */ 139 if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE) 140 panic("KERNEL_INITIAL_ORDER too small!"); 141 142 #ifdef CONFIG_64BIT 143 if(parisc_narrow_firmware) { 144 printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n"); 145 } 146 #endif 147 setup_pdc(); 148 setup_cmdline(cmdline_p); 149 collect_boot_cpu_data(); 150 do_memory_inventory(); /* probe for physical memory */ 151 parisc_cache_init(); 152 paging_init(); 153 154 #ifdef CONFIG_CHASSIS_LCD_LED 155 /* initialize the LCD/LED after boot_cpu_data is available ! */ 156 led_init(); /* LCD/LED initialization */ 157 #endif 158 159 #ifdef CONFIG_PA11 160 dma_ops_init(); 161 #endif 162 163 clear_sched_clock_stable(); 164 } 165 166 /* 167 * Display CPU info for all CPUs. 168 */ 169 static void * 170 c_start (struct seq_file *m, loff_t *pos) 171 { 172 /* Looks like the caller will call repeatedly until we return 173 * 0, signaling EOF perhaps. This could be used to sequence 174 * through CPUs for example. Since we print all cpu info in our 175 * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above) 176 * we only allow for one "position". */ 177 return ((long)*pos < 1) ? (void *)1 : NULL; 178 } 179 180 static void * 181 c_next (struct seq_file *m, void *v, loff_t *pos) 182 { 183 ++*pos; 184 return c_start(m, pos); 185 } 186 187 static void 188 c_stop (struct seq_file *m, void *v) 189 { 190 } 191 192 const struct seq_operations cpuinfo_op = { 193 .start = c_start, 194 .next = c_next, 195 .stop = c_stop, 196 .show = show_cpuinfo 197 }; 198 199 static void __init parisc_proc_mkdir(void) 200 { 201 /* 202 ** Can't call proc_mkdir() until after proc_root_init() has been 203 ** called by start_kernel(). In other words, this code can't 204 ** live in arch/.../setup.c because start_parisc() calls 205 ** start_kernel(). 206 */ 207 switch (boot_cpu_data.cpu_type) { 208 case pcxl: 209 case pcxl2: 210 if (NULL == proc_gsc_root) 211 { 212 proc_gsc_root = proc_mkdir("bus/gsc", NULL); 213 } 214 break; 215 case pcxt_: 216 case pcxu: 217 case pcxu_: 218 case pcxw: 219 case pcxw_: 220 case pcxw2: 221 if (NULL == proc_runway_root) 222 { 223 proc_runway_root = proc_mkdir("bus/runway", NULL); 224 } 225 break; 226 case mako: 227 case mako2: 228 if (NULL == proc_mckinley_root) 229 { 230 proc_mckinley_root = proc_mkdir("bus/mckinley", NULL); 231 } 232 break; 233 default: 234 /* FIXME: this was added to prevent the compiler 235 * complaining about missing pcx, pcxs and pcxt 236 * I'm assuming they have neither gsc nor runway */ 237 break; 238 } 239 } 240 241 static struct resource central_bus = { 242 .name = "Central Bus", 243 .start = F_EXTEND(0xfff80000), 244 .end = F_EXTEND(0xfffaffff), 245 .flags = IORESOURCE_MEM, 246 }; 247 248 static struct resource local_broadcast = { 249 .name = "Local Broadcast", 250 .start = F_EXTEND(0xfffb0000), 251 .end = F_EXTEND(0xfffdffff), 252 .flags = IORESOURCE_MEM, 253 }; 254 255 static struct resource global_broadcast = { 256 .name = "Global Broadcast", 257 .start = F_EXTEND(0xfffe0000), 258 .end = F_EXTEND(0xffffffff), 259 .flags = IORESOURCE_MEM, 260 }; 261 262 static int __init parisc_init_resources(void) 263 { 264 int result; 265 266 result = request_resource(&iomem_resource, ¢ral_bus); 267 if (result < 0) { 268 printk(KERN_ERR 269 "%s: failed to claim %s address space!\n", 270 __FILE__, central_bus.name); 271 return result; 272 } 273 274 result = request_resource(&iomem_resource, &local_broadcast); 275 if (result < 0) { 276 printk(KERN_ERR 277 "%s: failed to claim %s address space!\n", 278 __FILE__, local_broadcast.name); 279 return result; 280 } 281 282 result = request_resource(&iomem_resource, &global_broadcast); 283 if (result < 0) { 284 printk(KERN_ERR 285 "%s: failed to claim %s address space!\n", 286 __FILE__, global_broadcast.name); 287 return result; 288 } 289 290 return 0; 291 } 292 293 static int __init parisc_init(void) 294 { 295 u32 osid = (OS_ID_LINUX << 16); 296 297 parisc_proc_mkdir(); 298 parisc_init_resources(); 299 do_device_inventory(); /* probe for hardware */ 300 301 parisc_pdc_chassis_init(); 302 303 /* set up a new led state on systems shipped LED State panel */ 304 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART); 305 306 /* tell PDC we're Linux. Nevermind failure. */ 307 pdc_stable_write(0x40, &osid, sizeof(osid)); 308 309 /* start with known state */ 310 flush_cache_all_local(); 311 flush_tlb_all_local(NULL); 312 313 processor_init(); 314 #ifdef CONFIG_SMP 315 pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n", 316 num_online_cpus(), num_present_cpus(), 317 #else 318 pr_info("CPU(s): 1 x %s at %d.%06d MHz\n", 319 #endif 320 boot_cpu_data.cpu_name, 321 boot_cpu_data.cpu_hz / 1000000, 322 boot_cpu_data.cpu_hz % 1000000 ); 323 324 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP) 325 /* Don't serialize TLB flushes if we run on one CPU only. */ 326 if (num_online_cpus() == 1) 327 pa_serialize_tlb_flushes = 0; 328 #endif 329 330 apply_alternatives_all(); 331 parisc_setup_cache_timing(); 332 333 /* These are in a non-obvious order, will fix when we have an iotree */ 334 #if defined(CONFIG_IOSAPIC) 335 iosapic_init(); 336 #endif 337 #if defined(CONFIG_IOMMU_SBA) 338 sba_init(); 339 #endif 340 #if defined(CONFIG_PCI_LBA) 341 lba_init(); 342 #endif 343 344 /* CCIO before any potential subdevices */ 345 #if defined(CONFIG_IOMMU_CCIO) 346 ccio_init(); 347 #endif 348 349 /* 350 * Need to register Asp & Wax before the EISA adapters for the IRQ 351 * regions. EISA must come before PCI to be sure it gets IRQ region 352 * 0. 353 */ 354 #if defined(CONFIG_GSC_LASI) || defined(CONFIG_GSC_WAX) 355 gsc_init(); 356 #endif 357 #ifdef CONFIG_EISA 358 parisc_eisa_init(); 359 #endif 360 361 #if defined(CONFIG_HPPB) 362 hppb_init(); 363 #endif 364 365 #if defined(CONFIG_GSC_DINO) 366 dino_init(); 367 #endif 368 369 #ifdef CONFIG_CHASSIS_LCD_LED 370 register_led_regions(); /* register LED port info in procfs */ 371 #endif 372 373 return 0; 374 } 375 arch_initcall(parisc_init); 376 377 void __init start_parisc(void) 378 { 379 int ret, cpunum; 380 struct pdc_coproc_cfg coproc_cfg; 381 382 /* check QEMU/SeaBIOS marker in PAGE0 */ 383 running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0); 384 385 cpunum = smp_processor_id(); 386 387 init_cpu_topology(); 388 389 set_firmware_width_unlocked(); 390 391 ret = pdc_coproc_cfg_unlocked(&coproc_cfg); 392 if (ret >= 0 && coproc_cfg.ccr_functional) { 393 mtctl(coproc_cfg.ccr_functional, 10); 394 395 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision; 396 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model; 397 398 asm volatile ("fstd %fr0,8(%sp)"); 399 } else { 400 panic("must have an fpu to boot linux"); 401 } 402 403 early_trap_init(); /* initialize checksum of fault_vector */ 404 405 start_kernel(); 406 // not reached 407 } 408