mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/*
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* Copyright (C) 2004, 2005 by Thomas Koeller (thomas.koeller@baslerweb.com)
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* Based on the PMC-Sierra Yosemite board support by Ralf Baechle and
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* Manish Lachwani.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/smp.h>
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#include <linux/module.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/reboot.h>
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#include <asm/system.h>
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#include <asm/bootinfo.h>
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#include <asm/string.h>
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#include <excite.h>
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/* This struct is used by Redboot to pass arguments to the kernel */
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typedef struct
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{
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char *name;
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char *val;
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} t_env_var;
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struct parmblock {
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t_env_var memsize;
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t_env_var modetty0;
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t_env_var ethaddr;
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t_env_var env_end;
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char *argv[2];
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char text[0];
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};
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static unsigned int prom_argc;
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static const char ** prom_argv;
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static const t_env_var * prom_env;
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static void prom_halt(void) __attribute__((noreturn));
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static void prom_exit(void) __attribute__((noreturn));
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const char *get_system_type(void)
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{
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return "Basler eXcite";
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}
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/*
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* Halt the system
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*/
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static void prom_halt(void)
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{
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printk(KERN_NOTICE "\n** System halted.\n");
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while (1)
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asm volatile (
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"\t.set\tmips3\n"
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"\twait\n"
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"\t.set\tmips0\n"
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);
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}
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/*
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* Reset the CPU and re-enter Redboot
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*/
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static void prom_exit(void)
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{
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unsigned int i;
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volatile unsigned char * const flg =
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(volatile unsigned char *) (EXCITE_ADDR_FPGA + EXCITE_FPGA_DPR);
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/* Clear the watchdog reset flag, set the reboot flag */
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*flg &= ~0x01;
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*flg |= 0x80;
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for (i = 0; i < 10; i++) {
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*(volatile unsigned char *) (EXCITE_ADDR_FPGA + EXCITE_FPGA_SYSCTL) = 0x02;
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iob();
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mdelay(1000);
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}
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printk(KERN_NOTICE "Reset failed\n");
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prom_halt();
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}
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static const char __init *prom_getenv(char *name)
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{
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const t_env_var * p;
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for (p = prom_env; p->name != NULL; p++)
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if(strcmp(name, p->name) == 0)
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break;
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return p->val;
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}
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/*
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* Init routine which accepts the variables from Redboot
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*/
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void __init prom_init(void)
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{
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const struct parmblock * const pb = (struct parmblock *) fw_arg2;
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prom_argc = fw_arg0;
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prom_argv = (const char **) fw_arg1;
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prom_env = &pb->memsize;
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/* Callbacks for halt, restart */
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_machine_restart = (void (*)(char *)) prom_exit;
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_machine_halt = prom_halt;
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#ifdef CONFIG_32BIT
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/* copy command line */
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strcpy(arcs_cmdline, prom_argv[1]);
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memsize = simple_strtol(prom_getenv("memsize"), NULL, 16);
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strcpy(modetty, prom_getenv("modetty0"));
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#endif /* CONFIG_32BIT */
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#ifdef CONFIG_64BIT
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# error 64 bit support not implemented
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#endif /* CONFIG_64BIT */
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mips_machgroup = MACH_GROUP_TITAN;
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mips_machtype = MACH_TITAN_EXCITE;
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}
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/* This is called from free_initmem(), so we need to provide it */
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void __init prom_free_prom_memory(void)
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{
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/* Nothing to do */
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}
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