arch/m68k/sun3/config.c

   1 /*
   2  *  linux/arch/m68k/sun3/config.c
   3  *
   4  *  Copyright (C) 1996,1997 Pekka Pietik{inen
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/mm.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/tty.h>
  16 #include <linux/console.h>
  17 #include <linux/init.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/platform_device.h>
  20
  21 #include <asm/oplib.h>
  22 #include <asm/setup.h>
  23 #include <asm/contregs.h>
  24 #include <asm/movs.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/pgalloc.h>
  27 #include <asm/sun3-head.h>
  28 #include <asm/sun3mmu.h>
  29 #include <asm/machdep.h>
  30 #include <asm/machines.h>
  31 #include <asm/idprom.h>
  32 #include <asm/intersil.h>
  33 #include <asm/irq.h>
  34 #include <asm/sections.h>
  35 #include <asm/segment.h>
  36 #include <asm/sun3ints.h>
  37
  38 char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
  39
  40 extern u32 sun3_gettimeoffset(void);
  41 static void sun3_sched_init(irq_handler_t handler);
  42 extern void sun3_get_model (char* model);
  43 extern int sun3_hwclk(int set, struct rtc_time *t);
  44
  45 volatile char* clock_va;
  46 extern unsigned long availmem;
  47 unsigned long num_pages;
  48
  49 static void sun3_get_hardware_list(struct seq_file *m)
  50 {
  51         seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid);
  52 }
  53
  54 void __init sun3_init(void)
  55 {
  56         unsigned char enable_register;
  57         int i;
  58
  59         m68k_machtype= MACH_SUN3;
  60         m68k_cputype = CPU_68020;
  61         m68k_fputype = FPU_68881; /* mc68881 actually */
  62         m68k_mmutype = MMU_SUN3;
  63         clock_va    =          (char *) 0xfe06000;      /* dark  */
  64         sun3_intreg = (unsigned char *) 0xfe0a000;      /* magic */
  65         sun3_disable_interrupts();
  66
  67         prom_init((void *)LINUX_OPPROM_BEGVM);
  68
  69         GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  70         enable_register |= 0x50; /* Enable FPU */
  71         SET_CONTROL_BYTE(AC_SENABLE,enable_register);
  72         GET_CONTROL_BYTE(AC_SENABLE,enable_register);
  73
  74         /* This code looks suspicious, because it doesn't subtract
  75            memory belonging to the kernel from the available space */
  76
  77
  78         memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
  79
  80         /* Reserve important PMEGS */
  81         /* FIXME: These should be probed instead of hardcoded */
  82
  83         for (i=0; i<8; i++)             /* Kernel PMEGs */
  84                 sun3_reserved_pmeg[i] = 1;
  85
  86         sun3_reserved_pmeg[247] = 1;    /* ROM mapping  */
  87         sun3_reserved_pmeg[248] = 1;    /* AMD Ethernet */
  88         sun3_reserved_pmeg[251] = 1;    /* VB area      */
  89         sun3_reserved_pmeg[254] = 1;    /* main I/O     */
  90
  91         sun3_reserved_pmeg[249] = 1;
  92         sun3_reserved_pmeg[252] = 1;
  93         sun3_reserved_pmeg[253] = 1;
  94         set_fs(KERNEL_DS);
  95 }
  96
  97 /* Without this, Bad Things happen when something calls arch_reset. */
  98 static void sun3_reboot (void)
  99 {
 100         prom_reboot ("vmlinux");
 101 }
 102
 103 static void sun3_halt (void)
 104 {
 105         prom_halt ();
 106 }
 107
 108 /* sun3 bootmem allocation */
 109
 110 static void __init sun3_bootmem_alloc(unsigned long memory_start,
 111                                       unsigned long memory_end)
 112 {
 113         unsigned long start_page;
 114
 115         /* align start/end to page boundaries */
 116         memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
 117         memory_end = memory_end & PAGE_MASK;
 118
 119         start_page = __pa(memory_start) >> PAGE_SHIFT;
 120         max_pfn = num_pages = __pa(memory_end) >> PAGE_SHIFT;
 121
 122         high_memory = (void *)memory_end;
 123         availmem = memory_start;
 124
 125         m68k_setup_node(0);
 126         availmem += init_bootmem(start_page, num_pages);
 127         availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
 128
 129         free_bootmem(__pa(availmem), memory_end - (availmem));
 130 }
 131
 132
 133 void __init config_sun3(void)
 134 {
 135         unsigned long memory_start, memory_end;
 136
 137         pr_info("ARCH: SUN3\n");
 138         idprom_init();
 139
 140         /* Subtract kernel memory from available memory */
 141
 142         mach_sched_init      =  sun3_sched_init;
 143         mach_init_IRQ        =  sun3_init_IRQ;
 144         mach_reset           =  sun3_reboot;
 145         arch_gettimeoffset   =  sun3_gettimeoffset;
 146         mach_get_model       =  sun3_get_model;
 147         mach_hwclk           =  sun3_hwclk;
 148         mach_halt            =  sun3_halt;
 149         mach_get_hardware_list = sun3_get_hardware_list;
 150
 151         memory_start = ((((unsigned long)_end) + 0x2000) & ~0x1fff);
 152 // PROM seems to want the last couple of physical pages. --m
 153         memory_end   = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
 154
 155         m68k_num_memory=1;
 156         m68k_memory[0].size=*(romvec->pv_sun3mem);
 157
 158         sun3_bootmem_alloc(memory_start, memory_end);
 159 }
 160
 161 static void __init sun3_sched_init(irq_handler_t timer_routine)
 162 {
 163         sun3_disable_interrupts();
 164         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
 165         intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
 166         intersil_clear();
 167         sun3_enable_irq(5);
 168         intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
 169         sun3_enable_interrupts();
 170         intersil_clear();
 171 }
 172
 173 #if IS_ENABLED(CONFIG_SUN3_SCSI)
 174
 175 static const struct resource sun3_scsi_vme_rsrc[] __initconst = {
 176         {
 177                 .flags = IORESOURCE_IRQ,
 178                 .start = SUN3_VEC_VMESCSI0,
 179                 .end   = SUN3_VEC_VMESCSI0,
 180         }, {
 181                 .flags = IORESOURCE_MEM,
 182                 .start = 0xff200000,
 183                 .end   = 0xff200021,
 184         }, {
 185                 .flags = IORESOURCE_IRQ,
 186                 .start = SUN3_VEC_VMESCSI1,
 187                 .end   = SUN3_VEC_VMESCSI1,
 188         }, {
 189                 .flags = IORESOURCE_MEM,
 190                 .start = 0xff204000,
 191                 .end   = 0xff204021,
 192         },
 193 };
 194
 195 /*
 196  * Int: level 2 autovector
 197  * IO: type 1, base 0x00140000, 5 bits phys space: A<4..0>
 198  */
 199 static const struct resource sun3_scsi_rsrc[] __initconst = {
 200         {
 201                 .flags = IORESOURCE_IRQ,
 202                 .start = 2,
 203                 .end   = 2,
 204         }, {
 205                 .flags = IORESOURCE_MEM,
 206                 .start = 0x00140000,
 207                 .end   = 0x0014001f,
 208         },
 209 };
 210
 211 int __init sun3_platform_init(void)
 212 {
 213         switch (idprom->id_machtype) {
 214         case SM_SUN3 | SM_3_160:
 215         case SM_SUN3 | SM_3_260:
 216                 platform_device_register_simple("sun3_scsi_vme", -1,
 217                         sun3_scsi_vme_rsrc, ARRAY_SIZE(sun3_scsi_vme_rsrc));
 218                 break;
 219         case SM_SUN3 | SM_3_50:
 220         case SM_SUN3 | SM_3_60:
 221                 platform_device_register_simple("sun3_scsi", -1,
 222                         sun3_scsi_rsrc, ARRAY_SIZE(sun3_scsi_rsrc));
 223                 break;
 224         }
 225         return 0;
 226 }
 227
 228 arch_initcall(sun3_platform_init);
 229
 230 #endif