mirror of
https://github.com/torvalds/linux
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4d1da8c296
[Ralf: Fixed up reject and Wu's complaints about comment style.] Signed-off-by: Alexander Clouter <alex@digriz.org.uk> To: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/921/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
268 lines
6.2 KiB
C
268 lines
6.2 KiB
C
/*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Putting things on the screen/serial line using YAMONs facilities.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/serial_reg.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/io.h>
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#include <asm/bootinfo.h>
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#include <asm/mach-ar7/ar7.h>
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#include <asm/mach-ar7/prom.h>
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#define MAX_ENTRY 80
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struct env_var {
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char *name;
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char *value;
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};
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static struct env_var adam2_env[MAX_ENTRY];
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char *prom_getenv(const char *name)
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{
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int i;
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for (i = 0; (i < MAX_ENTRY) && adam2_env[i].name; i++)
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if (!strcmp(name, adam2_env[i].name))
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return adam2_env[i].value;
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return NULL;
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}
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EXPORT_SYMBOL(prom_getenv);
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static void __init ar7_init_cmdline(int argc, char *argv[])
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{
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int i;
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for (i = 1; i < argc; i++) {
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strlcat(arcs_cmdline, argv[i], COMMAND_LINE_SIZE);
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if (i < (argc - 1))
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strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
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}
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}
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struct psbl_rec {
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u32 psbl_size;
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u32 env_base;
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u32 env_size;
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u32 ffs_base;
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u32 ffs_size;
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};
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static __initdata char psp_env_version[] = "TIENV0.8";
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struct psp_env_chunk {
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u8 num;
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u8 ctrl;
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u16 csum;
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u8 len;
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char data[11];
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} __attribute__ ((packed));
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struct psp_var_map_entry {
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u8 num;
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char *value;
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};
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static struct psp_var_map_entry psp_var_map[] = {
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{ 1, "cpufrequency" },
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{ 2, "memsize" },
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{ 3, "flashsize" },
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{ 4, "modetty0" },
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{ 5, "modetty1" },
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{ 8, "maca" },
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{ 9, "macb" },
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{ 28, "sysfrequency" },
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{ 38, "mipsfrequency" },
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};
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/*
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Well-known variable (num is looked up in table above for matching variable name)
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Example: cpufrequency=211968000
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+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
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| 01 |CTRL|CHECKSUM | 01 | _2 | _1 | _1 | _9 | _6 | _8 | _0 | _0 | _0 | \0 | FF
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+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
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Name=Value pair in a single chunk
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Example: NAME=VALUE
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+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
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| 00 |CTRL|CHECKSUM | 01 | _N | _A | _M | _E | _0 | _V | _A | _L | _U | _E | \0
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+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
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Name=Value pair in 2 chunks (len is the number of chunks)
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Example: bootloaderVersion=1.3.7.15
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+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
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| 00 |CTRL|CHECKSUM | 02 | _b | _o | _o | _t | _l | _o | _a | _d | _e | _r | _V
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+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
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| _e | _r | _s | _i | _o | _n | \0 | _1 | _. | _3 | _. | _7 | _. | _1 | _5 | \0
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+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+---
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Data is padded with 0xFF
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*/
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#define PSP_ENV_SIZE 4096
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static char psp_env_data[PSP_ENV_SIZE] = { 0, };
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static char * __init lookup_psp_var_map(u8 num)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(psp_var_map); i++)
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if (psp_var_map[i].num == num)
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return psp_var_map[i].value;
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return NULL;
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}
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static void __init add_adam2_var(char *name, char *value)
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{
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int i;
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for (i = 0; i < MAX_ENTRY; i++) {
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if (!adam2_env[i].name) {
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adam2_env[i].name = name;
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adam2_env[i].value = value;
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return;
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} else if (!strcmp(adam2_env[i].name, name)) {
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adam2_env[i].value = value;
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return;
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}
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}
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}
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static int __init parse_psp_env(void *psp_env_base)
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{
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int i, n;
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char *name, *value;
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struct psp_env_chunk *chunks = (struct psp_env_chunk *)psp_env_data;
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memcpy_fromio(chunks, psp_env_base, PSP_ENV_SIZE);
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i = 1;
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n = PSP_ENV_SIZE / sizeof(struct psp_env_chunk);
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while (i < n) {
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if ((chunks[i].num == 0xff) || ((i + chunks[i].len) > n))
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break;
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value = chunks[i].data;
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if (chunks[i].num) {
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name = lookup_psp_var_map(chunks[i].num);
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} else {
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name = value;
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value += strlen(name) + 1;
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}
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if (name)
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add_adam2_var(name, value);
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i += chunks[i].len;
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}
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return 0;
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}
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static void __init ar7_init_env(struct env_var *env)
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{
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int i;
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struct psbl_rec *psbl = (struct psbl_rec *)(KSEG1ADDR(0x14000300));
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void *psp_env = (void *)KSEG1ADDR(psbl->env_base);
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if (strcmp(psp_env, psp_env_version) == 0) {
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parse_psp_env(psp_env);
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} else {
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for (i = 0; i < MAX_ENTRY; i++, env++)
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if (env->name)
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add_adam2_var(env->name, env->value);
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}
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}
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static void __init console_config(void)
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{
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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char console_string[40];
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int baud = 0;
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char parity = '\0', bits = '\0', flow = '\0';
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char *s, *p;
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if (strstr(arcs_cmdline, "console="))
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return;
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s = prom_getenv("modetty0");
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if (s) {
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baud = simple_strtoul(s, &p, 10);
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s = p;
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if (*s == ',')
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s++;
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if (*s)
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parity = *s++;
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if (*s == ',')
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s++;
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if (*s)
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bits = *s++;
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if (*s == ',')
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s++;
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if (*s == 'h')
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flow = 'r';
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}
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if (baud == 0)
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baud = 38400;
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if (parity != 'n' && parity != 'o' && parity != 'e')
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parity = 'n';
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if (bits != '7' && bits != '8')
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bits = '8';
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if (flow == 'r')
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sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
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parity, bits, flow);
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else
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sprintf(console_string, " console=ttyS0,%d%c%c", baud, parity,
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bits);
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strlcat(arcs_cmdline, console_string, COMMAND_LINE_SIZE);
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#endif
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}
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void __init prom_init(void)
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{
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ar7_init_cmdline(fw_arg0, (char **)fw_arg1);
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ar7_init_env((struct env_var *)fw_arg2);
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console_config();
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}
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#define PORT(offset) (KSEG1ADDR(AR7_REGS_UART0 + (offset * 4)))
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static inline unsigned int serial_in(int offset)
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{
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return readl((void *)PORT(offset));
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}
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static inline void serial_out(int offset, int value)
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{
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writel(value, (void *)PORT(offset));
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}
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int prom_putchar(char c)
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{
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while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
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;
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serial_out(UART_TX, c);
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return 1;
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}
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