a8b7e9e8b0
Add support for initializing arcs_cmdline on JZ4740 based machines and provides a prom_putchar implementation. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1404/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
|
|
* JZ4740 SoC prom code
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <linux/serial_reg.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/mach-jz4740/base.h>
|
|
|
|
void jz4740_init_cmdline(int argc, char *argv[])
|
|
{
|
|
unsigned int count = COMMAND_LINE_SIZE - 1;
|
|
int i;
|
|
char *dst = &(arcs_cmdline[0]);
|
|
char *src;
|
|
|
|
for (i = 1; i < argc && count; ++i) {
|
|
src = argv[i];
|
|
while (*src && count) {
|
|
*dst++ = *src++;
|
|
--count;
|
|
}
|
|
*dst++ = ' ';
|
|
}
|
|
if (i > 1)
|
|
--dst;
|
|
|
|
*dst = 0;
|
|
}
|
|
|
|
void __init prom_init(void)
|
|
{
|
|
jz4740_init_cmdline((int)fw_arg0, (char **)fw_arg1);
|
|
mips_machtype = MACH_INGENIC_JZ4740;
|
|
}
|
|
|
|
void __init prom_free_prom_memory(void)
|
|
{
|
|
}
|
|
|
|
#define UART_REG(_reg) ((void __iomem *)CKSEG1ADDR(JZ4740_UART0_BASE_ADDR + (_reg << 2)))
|
|
|
|
void prom_putchar(char c)
|
|
{
|
|
uint8_t lsr;
|
|
|
|
do {
|
|
lsr = readb(UART_REG(UART_LSR));
|
|
} while ((lsr & UART_LSR_TEMT) == 0);
|
|
|
|
writeb(c, UART_REG(UART_TX));
|
|
}
|