173 lines
4.6 KiB
C
173 lines
4.6 KiB
C
/*
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* linux/arch/m68k/sun3/config.c
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*
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* Copyright (C) 1996,1997 Pekka Pietik{inen
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/seq_file.h>
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#include <linux/tty.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <asm/oplib.h>
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#include <asm/setup.h>
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#include <asm/contregs.h>
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#include <asm/movs.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/sun3-head.h>
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#include <asm/sun3mmu.h>
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#include <asm/rtc.h>
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#include <asm/machdep.h>
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#include <asm/intersil.h>
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#include <asm/irq.h>
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#include <asm/segment.h>
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#include <asm/sun3ints.h>
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extern char _text, _end;
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char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
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extern unsigned long sun3_gettimeoffset(void);
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static void sun3_sched_init(irq_handler_t handler);
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extern void sun3_get_model (char* model);
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extern void idprom_init (void);
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extern int sun3_hwclk(int set, struct rtc_time *t);
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volatile char* clock_va;
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extern volatile unsigned char* sun3_intreg;
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extern unsigned long availmem;
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unsigned long num_pages;
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static void sun3_get_hardware_list(struct seq_file *m)
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{
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seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid);
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}
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void __init sun3_init(void)
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{
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unsigned char enable_register;
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int i;
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m68k_machtype= MACH_SUN3;
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m68k_cputype = CPU_68020;
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m68k_fputype = FPU_68881; /* mc68881 actually */
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m68k_mmutype = MMU_SUN3;
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clock_va = (char *) 0xfe06000; /* dark */
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sun3_intreg = (unsigned char *) 0xfe0a000; /* magic */
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sun3_disable_interrupts();
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prom_init((void *)LINUX_OPPROM_BEGVM);
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GET_CONTROL_BYTE(AC_SENABLE,enable_register);
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enable_register |= 0x50; /* Enable FPU */
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SET_CONTROL_BYTE(AC_SENABLE,enable_register);
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GET_CONTROL_BYTE(AC_SENABLE,enable_register);
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/* This code looks suspicious, because it doesn't subtract
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memory belonging to the kernel from the available space */
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memset(sun3_reserved_pmeg, 0, sizeof(sun3_reserved_pmeg));
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/* Reserve important PMEGS */
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/* FIXME: These should be probed instead of hardcoded */
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for (i=0; i<8; i++) /* Kernel PMEGs */
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sun3_reserved_pmeg[i] = 1;
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sun3_reserved_pmeg[247] = 1; /* ROM mapping */
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sun3_reserved_pmeg[248] = 1; /* AMD Ethernet */
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sun3_reserved_pmeg[251] = 1; /* VB area */
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sun3_reserved_pmeg[254] = 1; /* main I/O */
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sun3_reserved_pmeg[249] = 1;
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sun3_reserved_pmeg[252] = 1;
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sun3_reserved_pmeg[253] = 1;
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set_fs(KERNEL_DS);
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}
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/* Without this, Bad Things happen when something calls arch_reset. */
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static void sun3_reboot (void)
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{
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prom_reboot ("vmlinux");
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}
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static void sun3_halt (void)
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{
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prom_halt ();
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}
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/* sun3 bootmem allocation */
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static void __init sun3_bootmem_alloc(unsigned long memory_start,
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unsigned long memory_end)
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{
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unsigned long start_page;
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/* align start/end to page boundaries */
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memory_start = ((memory_start + (PAGE_SIZE-1)) & PAGE_MASK);
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memory_end = memory_end & PAGE_MASK;
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start_page = __pa(memory_start) >> PAGE_SHIFT;
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num_pages = __pa(memory_end) >> PAGE_SHIFT;
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high_memory = (void *)memory_end;
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availmem = memory_start;
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m68k_setup_node(0);
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availmem += init_bootmem_node(NODE_DATA(0), start_page, 0, num_pages);
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availmem = (availmem + (PAGE_SIZE-1)) & PAGE_MASK;
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free_bootmem(__pa(availmem), memory_end - (availmem));
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}
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void __init config_sun3(void)
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{
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unsigned long memory_start, memory_end;
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printk("ARCH: SUN3\n");
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idprom_init();
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/* Subtract kernel memory from available memory */
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mach_sched_init = sun3_sched_init;
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mach_init_IRQ = sun3_init_IRQ;
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mach_reset = sun3_reboot;
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mach_gettimeoffset = sun3_gettimeoffset;
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mach_get_model = sun3_get_model;
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mach_hwclk = sun3_hwclk;
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mach_halt = sun3_halt;
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mach_get_hardware_list = sun3_get_hardware_list;
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memory_start = ((((int)&_end) + 0x2000) & ~0x1fff);
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// PROM seems to want the last couple of physical pages. --m
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memory_end = *(romvec->pv_sun3mem) + PAGE_OFFSET - 2*PAGE_SIZE;
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m68k_num_memory=1;
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m68k_memory[0].size=*(romvec->pv_sun3mem);
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sun3_bootmem_alloc(memory_start, memory_end);
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}
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static void __init sun3_sched_init(irq_handler_t timer_routine)
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{
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sun3_disable_interrupts();
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intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_DISABLE|INTERSIL_24H_MODE);
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intersil_clock->int_reg=INTERSIL_HZ_100_MASK;
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intersil_clear();
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sun3_enable_irq(5);
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intersil_clock->cmd_reg=(INTERSIL_RUN|INTERSIL_INT_ENABLE|INTERSIL_24H_MODE);
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sun3_enable_interrupts();
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intersil_clear();
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}
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