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