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/pdc_chassis.h> 35 #include <asm/io.h> 36 #include <asm/setup.h> 37 #include <asm/unwind.h> 38 #include <asm/smp.h> 39 40 static char __initdata command_line[COMMAND_LINE_SIZE]; 41 42 static void __init setup_cmdline(char **cmdline_p) 43 { 44 extern unsigned int boot_args[]; 45 char *p; 46 47 *cmdline_p = command_line; 48 49 /* boot_args[0] is free-mem start, boot_args[1] is ptr to command line */ 50 if (boot_args[0] < 64) 51 return; /* return if called from hpux boot loader */ 52 53 /* Collect stuff passed in from the boot loader */ 54 strscpy(boot_command_line, (char *)__va(boot_args[1]), 55 COMMAND_LINE_SIZE); 56 57 /* autodetect console type (if not done by palo yet) */ 58 p = boot_command_line; 59 if (!str_has_prefix(p, "console=") && !strstr(p, " console=")) { 60 strlcat(p, " console=", COMMAND_LINE_SIZE); 61 if (PAGE0->mem_cons.cl_class == CL_DUPLEX) 62 strlcat(p, "ttyS0", COMMAND_LINE_SIZE); 63 else 64 strlcat(p, "tty0", COMMAND_LINE_SIZE); 65 } 66 67 /* default to use early console */ 68 if (!strstr(p, "earlycon")) 69 strlcat(p, " earlycon=pdc", COMMAND_LINE_SIZE); 70 71 #ifdef CONFIG_BLK_DEV_INITRD 72 /* did palo pass us a ramdisk? */ 73 if (boot_args[2] != 0) { 74 initrd_start = (unsigned long)__va(boot_args[2]); 75 initrd_end = (unsigned long)__va(boot_args[3]); 76 } 77 #endif 78 79 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 80 } 81 82 #ifdef CONFIG_PA11 83 static void __init dma_ops_init(void) 84 { 85 switch (boot_cpu_data.cpu_type) { 86 case pcx: 87 /* 88 * We've got way too many dependencies on 1.1 semantics 89 * to support 1.0 boxes at this point. 90 */ 91 panic( "PA-RISC Linux currently only supports machines that conform to\n" 92 "the PA-RISC 1.1 or 2.0 architecture specification.\n"); 93 94 case pcxl2: 95 default: 96 break; 97 } 98 } 99 #endif 100 101 void __init setup_arch(char **cmdline_p) 102 { 103 #ifdef CONFIG_64BIT 104 extern int parisc_narrow_firmware; 105 #endif 106 unwind_init(); 107 108 init_per_cpu(smp_processor_id()); /* Set Modes & Enable FP */ 109 110 #ifdef CONFIG_64BIT 111 printk(KERN_INFO "The 64-bit Kernel has started...\n"); 112 #else 113 printk(KERN_INFO "The 32-bit Kernel has started...\n"); 114 #endif 115 116 printk(KERN_INFO "Kernel default page size is %d KB. Huge pages ", 117 (int)(PAGE_SIZE / 1024)); 118 #ifdef CONFIG_HUGETLB_PAGE 119 printk(KERN_CONT "enabled with %d MB physical and %d MB virtual size", 120 1 << (REAL_HPAGE_SHIFT - 20), 1 << (HPAGE_SHIFT - 20)); 121 #else 122 printk(KERN_CONT "disabled"); 123 #endif 124 printk(KERN_CONT ".\n"); 125 126 /* 127 * Check if initial kernel page mappings are sufficient. 128 * panic early if not, else we may access kernel functions 129 * and variables which can't be reached. 130 */ 131 if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE) 132 panic("KERNEL_INITIAL_ORDER too small!"); 133 134 #ifdef CONFIG_64BIT 135 if(parisc_narrow_firmware) { 136 printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n"); 137 } 138 #endif 139 setup_pdc(); 140 setup_cmdline(cmdline_p); 141 collect_boot_cpu_data(); 142 do_memory_inventory(); /* probe for physical memory */ 143 parisc_cache_init(); 144 paging_init(); 145 146 #ifdef CONFIG_CHASSIS_LCD_LED 147 /* initialize the LCD/LED after boot_cpu_data is available ! */ 148 led_init(); /* LCD/LED initialization */ 149 #endif 150 151 #ifdef CONFIG_PA11 152 dma_ops_init(); 153 #endif 154 155 clear_sched_clock_stable(); 156 } 157 158 /* 159 * Display CPU info for all CPUs. 160 */ 161 static void * 162 c_start (struct seq_file *m, loff_t *pos) 163 { 164 /* Looks like the caller will call repeatedly until we return 165 * 0, signaling EOF perhaps. This could be used to sequence 166 * through CPUs for example. Since we print all cpu info in our 167 * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above) 168 * we only allow for one "position". */ 169 return ((long)*pos < 1) ? (void *)1 : NULL; 170 } 171 172 static void * 173 c_next (struct seq_file *m, void *v, loff_t *pos) 174 { 175 ++*pos; 176 return c_start(m, pos); 177 } 178 179 static void 180 c_stop (struct seq_file *m, void *v) 181 { 182 } 183 184 const struct seq_operations cpuinfo_op = { 185 .start = c_start, 186 .next = c_next, 187 .stop = c_stop, 188 .show = show_cpuinfo 189 }; 190 191 static struct resource central_bus = { 192 .name = "Central Bus", 193 .start = F_EXTEND(0xfff80000), 194 .end = F_EXTEND(0xfffaffff), 195 .flags = IORESOURCE_MEM, 196 }; 197 198 static struct resource local_broadcast = { 199 .name = "Local Broadcast", 200 .start = F_EXTEND(0xfffb0000), 201 .end = F_EXTEND(0xfffdffff), 202 .flags = IORESOURCE_MEM, 203 }; 204 205 static struct resource global_broadcast = { 206 .name = "Global Broadcast", 207 .start = F_EXTEND(0xfffe0000), 208 .end = F_EXTEND(0xffffffff), 209 .flags = IORESOURCE_MEM, 210 }; 211 212 static int __init parisc_init_resources(void) 213 { 214 int result; 215 216 result = request_resource(&iomem_resource, ¢ral_bus); 217 if (result < 0) { 218 printk(KERN_ERR 219 "%s: failed to claim %s address space!\n", 220 __FILE__, central_bus.name); 221 return result; 222 } 223 224 result = request_resource(&iomem_resource, &local_broadcast); 225 if (result < 0) { 226 printk(KERN_ERR 227 "%s: failed to claim %s address space!\n", 228 __FILE__, local_broadcast.name); 229 return result; 230 } 231 232 result = request_resource(&iomem_resource, &global_broadcast); 233 if (result < 0) { 234 printk(KERN_ERR 235 "%s: failed to claim %s address space!\n", 236 __FILE__, global_broadcast.name); 237 return result; 238 } 239 240 return 0; 241 } 242 243 static int __init parisc_init(void) 244 { 245 u32 osid = (OS_ID_LINUX << 16); 246 247 parisc_init_resources(); 248 do_device_inventory(); /* probe for hardware */ 249 250 parisc_pdc_chassis_init(); 251 252 /* set up a new led state on systems shipped LED State panel */ 253 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART); 254 255 /* tell PDC we're Linux. Nevermind failure. */ 256 pdc_stable_write(0x40, &osid, sizeof(osid)); 257 258 /* start with known state */ 259 flush_cache_all_local(); 260 flush_tlb_all_local(NULL); 261 262 processor_init(); 263 #ifdef CONFIG_SMP 264 pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n", 265 num_online_cpus(), num_present_cpus(), 266 #else 267 pr_info("CPU(s): 1 x %s at %d.%06d MHz\n", 268 #endif 269 boot_cpu_data.cpu_name, 270 boot_cpu_data.cpu_hz / 1000000, 271 boot_cpu_data.cpu_hz % 1000000 ); 272 273 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP) 274 /* Don't serialize TLB flushes if we run on one CPU only. */ 275 if (num_online_cpus() == 1) 276 pa_serialize_tlb_flushes = 0; 277 #endif 278 279 apply_alternatives_all(); 280 parisc_setup_cache_timing(); 281 282 /* These are in a non-obvious order, will fix when we have an iotree */ 283 #if defined(CONFIG_IOSAPIC) 284 iosapic_init(); 285 #endif 286 #if defined(CONFIG_IOMMU_SBA) 287 sba_init(); 288 #endif 289 #if defined(CONFIG_PCI_LBA) 290 lba_init(); 291 #endif 292 293 /* CCIO before any potential subdevices */ 294 #if defined(CONFIG_IOMMU_CCIO) 295 ccio_init(); 296 #endif 297 298 /* 299 * Need to register Asp & Wax before the EISA adapters for the IRQ 300 * regions. EISA must come before PCI to be sure it gets IRQ region 301 * 0. 302 */ 303 #if defined(CONFIG_GSC_LASI) || defined(CONFIG_GSC_WAX) 304 gsc_init(); 305 #endif 306 #ifdef CONFIG_EISA 307 parisc_eisa_init(); 308 #endif 309 310 #if defined(CONFIG_HPPB) 311 hppb_init(); 312 #endif 313 314 #ifdef CONFIG_CHASSIS_LCD_LED 315 register_led_regions(); /* register LED port info in procfs */ 316 #endif 317 318 return 0; 319 } 320 arch_initcall(parisc_init); 321 322 void __init start_parisc(void) 323 { 324 int ret, cpunum; 325 struct pdc_coproc_cfg coproc_cfg; 326 327 /* check QEMU/SeaBIOS marker in PAGE0 */ 328 running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0); 329 330 cpunum = smp_processor_id(); 331 332 init_cpu_topology(); 333 334 set_firmware_width_unlocked(); 335 336 ret = pdc_coproc_cfg_unlocked(&coproc_cfg); 337 if (ret >= 0 && coproc_cfg.ccr_functional) { 338 mtctl(coproc_cfg.ccr_functional, 10); 339 340 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision; 341 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model; 342 343 asm volatile ("fstd %fr0,8(%sp)"); 344 } else { 345 panic("must have an fpu to boot linux"); 346 } 347 348 early_trap_init(); /* initialize checksum of fault_vector */ 349 350 start_kernel(); 351 // not reached 352 } 353