1/*
2 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
3 *  JZ4740 SoC prom code
4 *
5 *  This program is free software; you can redistribute it and/or modify it
6 *  under  the terms of the GNU General	 Public License as published by the
7 *  Free Software Foundation;  either version 2 of the License, or (at your
8 *  option) any later version.
9 *
10 *  You should have received a copy of the GNU General Public License along
11 *  with this program; if not, write to the Free Software Foundation, Inc.,
12 *  675 Mass Ave, Cambridge, MA 02139, USA.
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/init.h>
19#include <linux/string.h>
20
21#include <linux/serial_reg.h>
22
23#include <asm/bootinfo.h>
24#include <asm/mach-jz4740/base.h>
25
26static __init void jz4740_init_cmdline(int argc, char *argv[])
27{
28	unsigned int count = COMMAND_LINE_SIZE - 1;
29	int i;
30	char *dst = &(arcs_cmdline[0]);
31	char *src;
32
33	for (i = 1; i < argc && count; ++i) {
34		src = argv[i];
35		while (*src && count) {
36			*dst++ = *src++;
37			--count;
38		}
39		*dst++ = ' ';
40	}
41	if (i > 1)
42		--dst;
43
44	*dst = 0;
45}
46
47void __init prom_init(void)
48{
49	jz4740_init_cmdline((int)fw_arg0, (char **)fw_arg1);
50	mips_machtype = MACH_INGENIC_JZ4740;
51}
52
53void __init prom_free_prom_memory(void)
54{
55}
56
57#define UART_REG(_reg) ((void __iomem *)CKSEG1ADDR(JZ4740_UART0_BASE_ADDR + (_reg << 2)))
58
59void prom_putchar(char c)
60{
61	uint8_t lsr;
62
63	do {
64		lsr = readb(UART_REG(UART_LSR));
65	} while ((lsr & UART_LSR_TEMT) == 0);
66
67	writeb(c, UART_REG(UART_TX));
68}
69