linux/arch/m68k/sun3/config.c
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   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
  37char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
  38
  39static void sun3_sched_init(void);
  40extern void sun3_get_model (char* model);
  41extern int sun3_hwclk(int set, struct rtc_time *t);
  42
  43volatile char* clock_va;
  44extern unsigned long availmem;
  45unsigned long num_pages;
  46
  47static void sun3_get_hardware_list(struct seq_file *m)
  48{
  49        seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid);
  50}
  51
  52void __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. */
  96static void sun3_reboot (void)
  97{
  98        prom_reboot ("vmlinux");
  99}
 100
 101static void sun3_halt (void)
 102{
 103        prom_halt ();
 104}
 105
 106/* sun3 bootmem allocation */
 107
 108static 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
 127void __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
 154static 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
 168static 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 */
 192static 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
 204int __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
 221arch_initcall(sun3_platform_init);
 222
 223#endif
 224