Root/arch/mips/jz4740/prom.c

1/*
2 *
3 * BRIEF MODULE DESCRIPTION
4 * PROM library initialisation code, supports YAMON and U-Boot.
5 *
6 * Copyright 2000, 2001, 2006 MontaVista Software Inc.
7 * Author: MontaVista Software, Inc.
8 * ppopov@mvista.com or source@mvista.com
9 *
10 * This file was derived from Carsten Langgaard's
11 * arch/mips/mips-boards/xx files.
12 *
13 * Carsten Langgaard, carstenl@mips.com
14 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
15 *
16 * This program is free software; you can redistribute it and/or modify it
17 * under the terms of the GNU General Public License as published by the
18 * Free Software Foundation; either version 2 of the License, or (at your
19 * option) any later version.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
24 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
27 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
28 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 *
32 * You should have received a copy of the GNU General Public License along
33 * with this program; if not, write to the Free Software Foundation, Inc.,
34 * 675 Mass Ave, Cambridge, MA 02139, USA.
35 */
36
37#include <linux/module.h>
38#include <linux/kernel.h>
39#include <linux/init.h>
40#include <linux/string.h>
41
42#include <asm/bootinfo.h>
43#include <asm/mach-jz4740/regs.h>
44
45/* #define DEBUG_CMDLINE */
46
47int prom_argc;
48char **prom_argv, **prom_envp;
49
50char *prom_getcmdline(void)
51{
52    return &(arcs_cmdline[0]);
53}
54
55void prom_init_cmdline(void)
56{
57    char *cp, *c;
58    size_t i = 1;
59
60    cp = &(arcs_cmdline[0]);
61    while(i < prom_argc) {
62        c = prom_argv[i];
63        while (*c) {
64            *cp++ = *c++;
65        }
66        *cp++ = ' ';
67        i++;
68    }
69    if (i > 1) {
70        *(cp - 1) = '\0';
71    }
72
73}
74
75void __init prom_init(void)
76{
77    unsigned long memsize;
78
79    prom_argc = (int) fw_arg0;
80    prom_argv = (char **) fw_arg1;
81    prom_envp = (char **) fw_arg2;
82
83    mips_machtype = MACH_INGENIC_JZ4740;
84
85    prom_init_cmdline();
86    memsize = 0x04000000;
87    add_memory_region(0, memsize, BOOT_MEM_RAM);
88}
89
90void __init prom_free_prom_memory(void)
91{
92}
93
94/* used by early printk */
95void prom_putchar(char c)
96{
97    volatile u8 *uart_lsr = (volatile u8 *)(UART0_BASE + OFF_LSR);
98    volatile u8 *uart_tdr = (volatile u8 *)(UART0_BASE + OFF_TDR);
99
100    /* Wait for fifo to shift out some bytes */
101    while ( !((*uart_lsr & (UARTLSR_TDRQ | UARTLSR_TEMT)) == 0x60) );
102
103    *uart_tdr = (u8)c;
104}
105
106const char *get_system_type(void)
107{
108    return "JZ4740";
109}
110
111EXPORT_SYMBOL(prom_getcmdline);
112

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