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
jz4740_init_cmdline(int argc,char * argv[])26 static __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
prom_init(void)47 void __init prom_init(void)
48 {
49 jz4740_init_cmdline((int)fw_arg0, (char **)fw_arg1);
50 mips_machtype = MACH_INGENIC_JZ4740;
51 }
52
prom_free_prom_memory(void)53 void __init prom_free_prom_memory(void)
54 {
55 }
56
57 #define UART_REG(_reg) ((void __iomem *)CKSEG1ADDR(JZ4740_UART0_BASE_ADDR + (_reg << 2)))
58
prom_putchar(char c)59 void 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