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/*
* Copyright 2002 Momentum Computer Inc.
* Author: Matthew Dharm <mdharm@momenco.com>
*
* Louis Hamilton, Red Hat, Inc.
* hamilton@redhat.com [MIPS64 modifications]
*
* Based on Ocelot Linux port, which is
* Copyright 2001 MontaVista Software Inc.
* Author: jsun@mvista.com or jsun@junsun.net
*
* 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.
*/
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/bootmem.h>
#include <linux/mv643xx.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/pmon.h>
#include "ocelot_c_fpga.h"
struct callvectors* debug_vectors;
extern unsigned long marvell_base;
extern unsigned long cpu_clock;
#ifdef CONFIG_MV643XX_ETH
extern unsigned char prom_mac_addr_base[6];
#endif
const char *get_system_type(void)
{
#ifdef CONFIG_CPU_SR71000
return "Momentum Ocelot-CS";
#else
return "Momentum Ocelot-C";
#endif
}
#ifdef CONFIG_MV643XX_ETH
static void burn_clocks(void)
{
int i;
/* this loop should burn at least 1us -- this should be plenty */
for (i = 0; i < 0x10000; i++)
;
}
static u8 exchange_bit(u8 val, u8 cs)
{
/* place the data */
OCELOT_FPGA_WRITE((val << 2) | cs, EEPROM_MODE);
burn_clocks();
/* turn the clock on */
OCELOT_FPGA_WRITE((val << 2) | cs | 0x2, EEPROM_MODE);
burn_clocks();
/* turn the clock off and read-strobe */
OCELOT_FPGA_WRITE((val << 2) | cs | 0x10, EEPROM_MODE);
/* return the data */
return ((OCELOT_FPGA_READ(EEPROM_MODE) >> 3) & 0x1);
}
void get_mac(char dest[6])
{
u8 read_opcode[12] = {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
int i,j;
for (i = 0; i < 12; i++)
exchange_bit(read_opcode[i], 1);
for (j = 0; j < 6; j++) {
dest[j] = 0;
for (i = 0; i < 8; i++) {
dest[j] <<= 1;
dest[j] |= exchange_bit(0, 1);
}
}
/* turn off CS */
exchange_bit(0,0);
}
#endif
#ifdef CONFIG_64BIT
unsigned long signext(unsigned long addr)
{
addr &= 0xffffffff;
return (unsigned long)((int)addr);
}
void *get_arg(unsigned long args, int arc)
{
unsigned long ul;
unsigned char *puc, uc;
args += (arc * 4);
ul = (unsigned long)signext(args);
puc = (unsigned char *)ul;
if (puc == 0)
return (void *)0;
#ifdef CONFIG_CPU_LITTLE_ENDIAN
uc = *puc++;
ul = (unsigned long)uc;
uc = *puc++;
ul |= (((unsigned long)uc) << 8);
uc = *puc++;
ul |= (((unsigned long)uc) << 16);
uc = *puc++;
ul |= (((unsigned long)uc) << 24);
#else /* CONFIG_CPU_LITTLE_ENDIAN */
uc = *puc++;
ul = ((unsigned long)uc) << 24;
uc = *puc++;
ul |= (((unsigned long)uc) << 16);
uc = *puc++;
ul |= (((unsigned long)uc) << 8);
uc = *puc++;
ul |= ((unsigned long)uc);
#endif /* CONFIG_CPU_LITTLE_ENDIAN */
ul = signext(ul);
return (void *)ul;
}
char *arg64(unsigned long addrin, int arg_index)
{
unsigned long args;
char *p;
args = signext(addrin);
p = (char *)get_arg(args, arg_index);
return p;
}
#endif /* CONFIG_64BIT */
void __init prom_init(void)
{
int argc = fw_arg0;
char **arg = (char **) fw_arg1;
char **env = (char **) fw_arg2;
struct callvectors *cv = (struct callvectors *) fw_arg3;
int i;
#ifdef CONFIG_64BIT
char *ptr;
printk("prom_init - MIPS64\n");
/* save the PROM vectors for debugging use */
debug_vectors = (struct callvectors *)signext((unsigned long)cv);
/* arg[0] is "g", the rest is boot parameters */
arcs_cmdline[0] = '\0';
for (i = 1; i < argc; i++) {
ptr = (char *)arg64((unsigned long)arg, i);
if ((strlen(arcs_cmdline) + strlen(ptr) + 1) >=
sizeof(arcs_cmdline))
break;
strcat(arcs_cmdline, ptr);
strcat(arcs_cmdline, " ");
}
i = 0;
while (1) {
ptr = (char *)arg64((unsigned long)env, i);
if (! ptr)
break;
if (strncmp("gtbase", ptr, strlen("gtbase")) == 0) {
marvell_base = simple_strtol(ptr + strlen("gtbase="),
NULL, 16);
if ((marvell_base & 0xffffffff00000000) == 0)
marvell_base |= 0xffffffff00000000;
printk("marvell_base set to 0x%016lx\n", marvell_base);
}
if (strncmp("cpuclock", ptr, strlen("cpuclock")) == 0) {
cpu_clock = simple_strtol(ptr + strlen("cpuclock="),
NULL, 10);
printk("cpu_clock set to %d\n", cpu_clock);
}
i++;
}
printk("arcs_cmdline: %s\n", arcs_cmdline);
#else /* CONFIG_64BIT */
/* save the PROM vectors for debugging use */
debug_vectors = cv;
/* arg[0] is "g", the rest is boot parameters */
arcs_cmdline[0] = '\0';
for (i = 1; i < argc; i++) {
if (strlen(arcs_cmdline) + strlen(arg[i] + 1)
>= sizeof(arcs_cmdline))
break;
strcat(arcs_cmdline, arg[i]);
strcat(arcs_cmdline, " ");
}
while (*env) {
if (strncmp("gtbase", *env, strlen("gtbase")) == 0) {
marvell_base = simple_strtol(*env + strlen("gtbase="),
NULL, 16);
}
if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0) {
cpu_clock = simple_strtol(*env + strlen("cpuclock="),
NULL, 10);
}
env++;
}
#endif /* CONFIG_64BIT */
mips_machgroup = MACH_GROUP_MOMENCO;
mips_machtype = MACH_MOMENCO_OCELOT_C;
#ifdef CONFIG_MV643XX_ETH
/* get the base MAC address for on-board ethernet ports */
get_mac(prom_mac_addr_base);
#endif
#ifndef CONFIG_64BIT
debug_vectors->printf("Booting Linux kernel...\n");
#endif
}
unsigned long __init prom_free_prom_memory(void)
{
return 0;
}
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