mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 18:15:04 +07:00
137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/*
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* Copyright 2001 MontaVista Software Inc.
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* Author: jsun@mvista.com or jsun@junsun.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/bootmem.h>
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#include <asm/addrspace.h>
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#include <asm/bootinfo.h>
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#include <asm/ddb5xxx/ddb5xxx.h>
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#include <asm/debug.h>
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const char *get_system_type(void)
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{
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switch (mips_machtype) {
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case MACH_NEC_DDB5074: return "NEC DDB Vrc-5074";
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case MACH_NEC_DDB5476: return "NEC DDB Vrc-5476";
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case MACH_NEC_DDB5477: return "NEC DDB Vrc-5477";
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case MACH_NEC_ROCKHOPPER: return "NEC Rockhopper";
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case MACH_NEC_ROCKHOPPERII: return "NEC RockhopperII";
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default: return "Unknown NEC board";
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}
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}
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#if defined(CONFIG_DDB5477)
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void ddb5477_runtime_detection(void);
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#endif
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/* [jsun@junsun.net] PMON passes arguments in C main() style */
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void __init prom_init(void)
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{
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int argc = fw_arg0;
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char **arg = (char**) fw_arg1;
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int i;
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/* if user passes kernel args, ignore the default one */
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if (argc > 1)
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arcs_cmdline[0] = '\0';
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/* arg[0] is "g", the rest is boot parameters */
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for (i = 1; i < argc; i++) {
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if (strlen(arcs_cmdline) + strlen(arg[i] + 1)
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>= sizeof(arcs_cmdline))
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break;
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strcat(arcs_cmdline, arg[i]);
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strcat(arcs_cmdline, " ");
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}
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mips_machgroup = MACH_GROUP_NEC_DDB;
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#if defined(CONFIG_DDB5477)
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ddb5477_runtime_detection();
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add_memory_region(0, board_ram_size, BOOT_MEM_RAM);
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#endif
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}
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unsigned long __init prom_free_prom_memory(void)
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{
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return 0;
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}
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#if defined(CONFIG_DDB5477)
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#define DEFAULT_LCS1_BASE 0x19000000
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#define TESTVAL1 'K'
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#define TESTVAL2 'S'
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int board_ram_size;
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void ddb5477_runtime_detection(void)
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{
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volatile char *test_offset;
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char saved_test_byte;
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/* Determine if this is a DDB5477 board, or a BSB-VR0300
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base board. We can tell by checking for the location of
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the NVRAM. It lives at the beginning of LCS1 on the DDB5477,
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and the beginning of LCS1 on the BSB-VR0300 is flash memory.
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The first 2K of the NVRAM are reserved, so don't we'll poke
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around just after that.
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*/
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/* We can only use the PCI bus to distinquish between
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the Rockhopper and RockhopperII backplanes and this must
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wait until ddb5477_board_init() in setup.c after the 5477
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is initialized. So, until then handle
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both Rockhopper and RockhopperII backplanes as Rockhopper 1
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*/
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test_offset = (char *)KSEG1ADDR(DEFAULT_LCS1_BASE + 0x800);
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saved_test_byte = *test_offset;
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*test_offset = TESTVAL1;
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if (*test_offset != TESTVAL1) {
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/* We couldn't set our test value, so it must not be NVRAM,
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so it's a BSB_VR0300 */
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mips_machtype = MACH_NEC_ROCKHOPPER;
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} else {
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/* We may have gotten lucky, and the TESTVAL1 was already
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stored at the test location, so we must check a second
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test value */
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*test_offset = TESTVAL2;
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if (*test_offset != TESTVAL2) {
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/* OK, we couldn't set this value either, so it must
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definately be a BSB_VR0300 */
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mips_machtype = MACH_NEC_ROCKHOPPER;
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} else {
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/* We could change the value twice, so it must be
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NVRAM, so it's a DDB_VRC5477 */
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mips_machtype = MACH_NEC_DDB5477;
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}
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}
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/* Restore the original byte */
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*test_offset = saved_test_byte;
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/* before we know a better way, we will trust PMON for getting
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* RAM size
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*/
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board_ram_size = 1 << (36 - (ddb_in32(DDB_SDRAM0) & 0xf));
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db_run(printk("DDB run-time detection : %s, %d MB RAM\n",
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mips_machtype == MACH_NEC_DDB5477 ?
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"DDB5477" : "Rockhopper",
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board_ram_size >> 20));
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/* we can't handle ram size > 128 MB */
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db_assert(board_ram_size <= (128 << 20));
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}
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#endif
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