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>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 SoC prom code
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/serial_reg.h>
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#include <asm/bootinfo.h>
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#include <asm/mach-jz4740/base.h>
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void jz4740_init_cmdline(int argc, char *argv[])
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{
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unsigned int count = COMMAND_LINE_SIZE - 1;
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int i;
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char *dst = &(arcs_cmdline[0]);
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char *src;
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for (i = 1; i < argc && count; ++i) {
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src = argv[i];
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while (*src && count) {
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*dst++ = *src++;
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--count;
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}
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*dst++ = ' ';
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}
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if (i > 1)
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--dst;
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*dst = 0;
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}
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void __init prom_init(void)
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{
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jz4740_init_cmdline((int)fw_arg0, (char **)fw_arg1);
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mips_machtype = MACH_INGENIC_JZ4740;
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}
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void __init prom_free_prom_memory(void)
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{
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}
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#define UART_REG(_reg) ((void __iomem *)CKSEG1ADDR(JZ4740_UART0_BASE_ADDR + (_reg << 2)))
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void prom_putchar(char c)
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{
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uint8_t lsr;
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do {
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lsr = readb(UART_REG(UART_LSR));
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} while ((lsr & UART_LSR_TEMT) == 0);
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writeb(c, UART_REG(UART_TX));
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}
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