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 unwind_init(); 104 105 init_per_cpu(smp_processor_id()); /* Set Modes & Enable FP */ 106 107 #ifdef CONFIG_64BIT 108 printk(KERN_INFO "The 64-bit Kernel has started...\n"); 109 #else 110 printk(KERN_INFO "The 32-bit Kernel has started...\n"); 111 #endif 112 113 printk(KERN_INFO "Kernel default page size is %d KB. Huge pages ", 114 (int)(PAGE_SIZE / 1024)); 115 #ifdef CONFIG_HUGETLB_PAGE 116 printk(KERN_CONT "enabled with %d MB physical and %d MB virtual size", 117 1 << (REAL_HPAGE_SHIFT - 20), 1 << (HPAGE_SHIFT - 20)); 118 #else 119 printk(KERN_CONT "disabled"); 120 #endif 121 printk(KERN_CONT ".\n"); 122 123 #ifdef CONFIG_64BIT 124 if(parisc_narrow_firmware) { 125 printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n"); 126 } 127 #endif 128 setup_pdc(); 129 setup_cmdline(cmdline_p); 130 collect_boot_cpu_data(); 131 do_memory_inventory(); /* probe for physical memory */ 132 parisc_cache_init(); 133 paging_init(); 134 135 /* 136 * Parse early parameters before mm_core_init_early() runs. 137 * Several early_param() handlers only record data that is consumed 138 * from there - for example hugepages=, hugepagesz=, 139 * default_hugepagesz=, hugetlb_cma= and hugetlb_free_vmemmap= - so 140 * the generic parse_early_param() call in start_kernel() is too late 141 * for them. jump_label_init() must come first, since early param 142 * handlers may enable or disable static keys. 143 */ 144 jump_label_init(); 145 parse_early_param(); 146 147 #ifdef CONFIG_PA11 148 dma_ops_init(); 149 #endif 150 151 clear_sched_clock_stable(); 152 } 153 154 /* 155 * Display CPU info for all CPUs. 156 */ 157 static void * 158 c_start (struct seq_file *m, loff_t *pos) 159 { 160 /* Looks like the caller will call repeatedly until we return 161 * 0, signaling EOF perhaps. This could be used to sequence 162 * through CPUs for example. Since we print all cpu info in our 163 * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above) 164 * we only allow for one "position". */ 165 return ((long)*pos < 1) ? (void *)1 : NULL; 166 } 167 168 static void * 169 c_next (struct seq_file *m, void *v, loff_t *pos) 170 { 171 ++*pos; 172 return c_start(m, pos); 173 } 174 175 static void 176 c_stop (struct seq_file *m, void *v) 177 { 178 } 179 180 const struct seq_operations cpuinfo_op = { 181 .start = c_start, 182 .next = c_next, 183 .stop = c_stop, 184 .show = show_cpuinfo 185 }; 186 187 static struct resource central_bus = { 188 .name = "Central Bus", 189 .start = F_EXTEND(0xfff80000), 190 .end = F_EXTEND(0xfffaffff), 191 .flags = IORESOURCE_MEM, 192 }; 193 194 static struct resource local_broadcast = { 195 .name = "Local Broadcast", 196 .start = F_EXTEND(0xfffb0000), 197 .end = F_EXTEND(0xfffdffff), 198 .flags = IORESOURCE_MEM, 199 }; 200 201 static struct resource global_broadcast = { 202 .name = "Global Broadcast", 203 .start = F_EXTEND(0xfffe0000), 204 .end = F_EXTEND(0xffffffff), 205 .flags = IORESOURCE_MEM, 206 }; 207 208 static int __init parisc_init_resources(void) 209 { 210 int result; 211 212 result = request_resource(&iomem_resource, ¢ral_bus); 213 if (result < 0) { 214 printk(KERN_ERR 215 "%s: failed to claim %s address space!\n", 216 __FILE__, central_bus.name); 217 return result; 218 } 219 220 result = request_resource(&iomem_resource, &local_broadcast); 221 if (result < 0) { 222 printk(KERN_ERR 223 "%s: failed to claim %s address space!\n", 224 __FILE__, local_broadcast.name); 225 return result; 226 } 227 228 result = request_resource(&iomem_resource, &global_broadcast); 229 if (result < 0) { 230 printk(KERN_ERR 231 "%s: failed to claim %s address space!\n", 232 __FILE__, global_broadcast.name); 233 return result; 234 } 235 236 return 0; 237 } 238 239 static int __init parisc_init(void) 240 { 241 u32 osid = (OS_ID_LINUX << 16); 242 243 parisc_init_resources(); 244 do_device_inventory(); /* probe for hardware */ 245 246 parisc_pdc_chassis_init(); 247 248 /* set up a new led state on systems shipped LED State panel */ 249 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART); 250 251 /* tell PDC we're Linux. Nevermind failure. */ 252 pdc_stable_write(0x40, &osid, sizeof(osid)); 253 254 /* start with known state */ 255 flush_cache_all_local(); 256 flush_tlb_all_local(NULL); 257 258 processor_init(); 259 #ifdef CONFIG_SMP 260 pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n", 261 num_online_cpus(), num_present_cpus(), 262 #else 263 pr_info("CPU(s): 1 x %s at %d.%06d MHz\n", 264 #endif 265 boot_cpu_data.cpu_name, 266 boot_cpu_data.cpu_hz / 1000000, 267 boot_cpu_data.cpu_hz % 1000000 ); 268 269 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP) 270 /* Don't serialize TLB flushes if we run on one CPU only. */ 271 if (num_online_cpus() == 1) 272 pa_serialize_tlb_flushes = 0; 273 #endif 274 275 apply_alternatives_all(); 276 parisc_setup_cache_timing(); 277 return 0; 278 } 279 arch_initcall(parisc_init); 280 281 void __init start_parisc(void) 282 { 283 int ret, cpunum; 284 struct pdc_coproc_cfg coproc_cfg; 285 286 /* 287 * Check if initial kernel page mapping is sufficient. 288 * Print warning if not, because we may access kernel functions and 289 * variables which can't be reached yet through the initial mappings. 290 * Note that the panic() and printk() functions are not functional 291 * yet, so we need to use direct iodc() firmware calls instead. 292 */ 293 const char warn1[] = "CRITICAL: Kernel may crash because " 294 "KERNEL_INITIAL_ORDER is too small.\n"; 295 if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE) 296 pdc_iodc_print(warn1, sizeof(warn1) - 1); 297 298 /* check QEMU/SeaBIOS marker in PAGE0 */ 299 running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0); 300 301 cpunum = smp_processor_id(); 302 303 init_cpu_topology(); 304 305 set_firmware_width_unlocked(); 306 307 ret = pdc_coproc_cfg_unlocked(&coproc_cfg); 308 if (ret >= 0 && coproc_cfg.ccr_functional) { 309 mtctl(coproc_cfg.ccr_functional, 10); 310 311 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision; 312 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model; 313 314 asm volatile ("fstd %fr0,8(%sp)"); 315 } else { 316 panic("must have an fpu to boot linux"); 317 } 318 319 early_trap_init(); /* initialize checksum of fault_vector */ 320 321 start_kernel(); 322 // not reached 323 } 324