diff options
Diffstat (limited to 'arch/mips/basler/excite/excite_prom.c')
| -rw-r--r-- | arch/mips/basler/excite/excite_prom.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/arch/mips/basler/excite/excite_prom.c b/arch/mips/basler/excite/excite_prom.c new file mode 100644 index 000000000000..84724b270753 --- /dev/null +++ b/arch/mips/basler/excite/excite_prom.c @@ -0,0 +1,148 @@ +/* + * Copyright (C) 2004, 2005 by Thomas Koeller (thomas.koeller@baslerweb.com) + * Based on the PMC-Sierra Yosemite board support by Ralf Baechle and + * Manish Lachwani. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/delay.h> +#include <linux/smp.h> +#include <linux/module.h> +#include <asm/io.h> +#include <asm/pgtable.h> +#include <asm/processor.h> +#include <asm/reboot.h> +#include <asm/system.h> +#include <asm/bootinfo.h> +#include <asm/string.h> + +#include <excite.h> + +/* This struct is used by Redboot to pass arguments to the kernel */ +typedef struct +{ + char *name; + char *val; +} t_env_var; + +struct parmblock { + t_env_var memsize; + t_env_var modetty0; + t_env_var ethaddr; + t_env_var env_end; + char *argv[2]; + char text[0]; +}; + +static unsigned int prom_argc; +static const char ** prom_argv; +static const t_env_var * prom_env; + +static void prom_halt(void) __attribute__((noreturn)); +static void prom_exit(void) __attribute__((noreturn)); + + + +const char *get_system_type(void) +{ + return "Basler eXcite"; +} + +/* + * Halt the system + */ +static void prom_halt(void) +{ + printk(KERN_NOTICE "\n** System halted.\n"); + while (1) + asm volatile ( + "\t.set\tmips3\n" + "\twait\n" + "\t.set\tmips0\n" + ); +} + +/* + * Reset the CPU and re-enter Redboot + */ +static void prom_exit(void) +{ + unsigned int i; + volatile unsigned char * const flg = + (volatile unsigned char *) (EXCITE_ADDR_FPGA + EXCITE_FPGA_DPR); + + /* Clear the watchdog reset flag, set the reboot flag */ + *flg &= ~0x01; + *flg |= 0x80; + + for (i = 0; i < 10; i++) { + *(volatile unsigned char *) (EXCITE_ADDR_FPGA + EXCITE_FPGA_SYSCTL) = 0x02; + iob(); + mdelay(1000); + } + + printk(KERN_NOTICE "Reset failed\n"); + prom_halt(); +} + +static const char __init *prom_getenv(char *name) +{ + const t_env_var * p; + for (p = prom_env; p->name != NULL; p++) + if(strcmp(name, p->name) == 0) + break; + return p->val; +} + +/* + * Init routine which accepts the variables from Redboot + */ +void __init prom_init(void) +{ + const struct parmblock * const pb = (struct parmblock *) fw_arg2; + + prom_argc = fw_arg0; + prom_argv = (const char **) fw_arg1; + prom_env = &pb->memsize; + + /* Callbacks for halt, restart */ + _machine_restart = (void (*)(char *)) prom_exit; + _machine_halt = prom_halt; + +#ifdef CONFIG_32BIT + /* copy command line */ + strcpy(arcs_cmdline, prom_argv[1]); + memsize = simple_strtol(prom_getenv("memsize"), NULL, 16); + strcpy(modetty, prom_getenv("modetty0")); +#endif /* CONFIG_32BIT */ + +#ifdef CONFIG_64BIT +# error 64 bit support not implemented +#endif /* CONFIG_64BIT */ + + mips_machgroup = MACH_GROUP_TITAN; + mips_machtype = MACH_TITAN_EXCITE; +} + +/* This is called from free_initmem(), so we need to provide it */ +void __init prom_free_prom_memory(void) +{ + /* Nothing to do */ +} |