arch/parisc/kernel/setup.c

   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         /*
 124          * Check if initial kernel page mappings are sufficient.
 125          * panic early if not, else we may access kernel functions
 126          * and variables which can't be reached.
 127          */
 128         if (__pa((unsigned long) &_end) >= KERNEL_INITIAL_SIZE)
 129                 panic("KERNEL_INITIAL_ORDER too small!");
 130
 131 #ifdef CONFIG_64BIT
 132         if(parisc_narrow_firmware) {
 133                 printk(KERN_INFO "Kernel is using PDC in 32-bit mode.\n");
 134         }
 135 #endif
 136         setup_pdc();
 137         setup_cmdline(cmdline_p);
 138         collect_boot_cpu_data();
 139         do_memory_inventory();  /* probe for physical memory */
 140         parisc_cache_init();
 141         paging_init();
 142
 143 #ifdef CONFIG_PA11
 144         dma_ops_init();
 145 #endif
 146
 147         clear_sched_clock_stable();
 148 }
 149
 150 /*
 151  * Display CPU info for all CPUs.
 152  */
 153 static void *
 154 c_start (struct seq_file *m, loff_t *pos)
 155 {
 156         /* Looks like the caller will call repeatedly until we return
 157          * 0, signaling EOF perhaps.  This could be used to sequence
 158          * through CPUs for example.  Since we print all cpu info in our
 159          * show_cpuinfo() disregarding 'pos' (which I assume is 'v' above)
 160          * we only allow for one "position".  */
 161         return ((long)*pos < 1) ? (void *)1 : NULL;
 162 }
 163
 164 static void *
 165 c_next (struct seq_file *m, void *v, loff_t *pos)
 166 {
 167         ++*pos;
 168         return c_start(m, pos);
 169 }
 170
 171 static void
 172 c_stop (struct seq_file *m, void *v)
 173 {
 174 }
 175
 176 const struct seq_operations cpuinfo_op = {
 177         .start  = c_start,
 178         .next   = c_next,
 179         .stop   = c_stop,
 180         .show   = show_cpuinfo
 181 };
 182
 183 static struct resource central_bus = {
 184         .name   = "Central Bus",
 185         .start  = F_EXTEND(0xfff80000),
 186         .end    = F_EXTEND(0xfffaffff),
 187         .flags  = IORESOURCE_MEM,
 188 };
 189
 190 static struct resource local_broadcast = {
 191         .name   = "Local Broadcast",
 192         .start  = F_EXTEND(0xfffb0000),
 193         .end    = F_EXTEND(0xfffdffff),
 194         .flags  = IORESOURCE_MEM,
 195 };
 196
 197 static struct resource global_broadcast = {
 198         .name   = "Global Broadcast",
 199         .start  = F_EXTEND(0xfffe0000),
 200         .end    = F_EXTEND(0xffffffff),
 201         .flags  = IORESOURCE_MEM,
 202 };
 203
 204 static int __init parisc_init_resources(void)
 205 {
 206         int result;
 207
 208         result = request_resource(&iomem_resource, &central_bus);
 209         if (result < 0) {
 210                 printk(KERN_ERR
 211                        "%s: failed to claim %s address space!\n",
 212                        __FILE__, central_bus.name);
 213                 return result;
 214         }
 215
 216         result = request_resource(&iomem_resource, &local_broadcast);
 217         if (result < 0) {
 218                 printk(KERN_ERR
 219                        "%s: failed to claim %s address space!\n",
 220                        __FILE__, local_broadcast.name);
 221                 return result;
 222         }
 223
 224         result = request_resource(&iomem_resource, &global_broadcast);
 225         if (result < 0) {
 226                 printk(KERN_ERR
 227                        "%s: failed to claim %s address space!\n",
 228                        __FILE__, global_broadcast.name);
 229                 return result;
 230         }
 231
 232         return 0;
 233 }
 234
 235 static int __init parisc_init(void)
 236 {
 237         u32 osid = (OS_ID_LINUX << 16);
 238
 239         parisc_init_resources();
 240         do_device_inventory();                  /* probe for hardware */
 241
 242         parisc_pdc_chassis_init();
 243
 244         /* set up a new led state on systems shipped LED State panel */
 245         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BSTART);
 246
 247         /* tell PDC we're Linux. Nevermind failure. */
 248         pdc_stable_write(0x40, &osid, sizeof(osid));
 249
 250         /* start with known state */
 251         flush_cache_all_local();
 252         flush_tlb_all_local(NULL);
 253
 254         processor_init();
 255 #ifdef CONFIG_SMP
 256         pr_info("CPU(s): %d out of %d %s at %d.%06d MHz online\n",
 257                 num_online_cpus(), num_present_cpus(),
 258 #else
 259         pr_info("CPU(s): 1 x %s at %d.%06d MHz\n",
 260 #endif
 261                         boot_cpu_data.cpu_name,
 262                         boot_cpu_data.cpu_hz / 1000000,
 263                         boot_cpu_data.cpu_hz % 1000000  );
 264
 265 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
 266         /* Don't serialize TLB flushes if we run on one CPU only. */
 267         if (num_online_cpus() == 1)
 268                 pa_serialize_tlb_flushes = 0;
 269 #endif
 270
 271         apply_alternatives_all();
 272         parisc_setup_cache_timing();
 273         return 0;
 274 }
 275 arch_initcall(parisc_init);
 276
 277 void __init start_parisc(void)
 278 {
 279         int ret, cpunum;
 280         struct pdc_coproc_cfg coproc_cfg;
 281
 282         /* check QEMU/SeaBIOS marker in PAGE0 */
 283         running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0);
 284
 285         cpunum = smp_processor_id();
 286
 287         init_cpu_topology();
 288
 289         set_firmware_width_unlocked();
 290
 291         ret = pdc_coproc_cfg_unlocked(&coproc_cfg);
 292         if (ret >= 0 && coproc_cfg.ccr_functional) {
 293                 mtctl(coproc_cfg.ccr_functional, 10);
 294
 295                 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
 296                 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
 297
 298                 asm volatile ("fstd     %fr0,8(%sp)");
 299         } else {
 300                 panic("must have an fpu to boot linux");
 301         }
 302
 303         early_trap_init(); /* initialize checksum of fault_vector */
 304
 305         start_kernel();
 306         // not reached
 307 }