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    Subject[RFC][PATCH 12/26] MIPS: JZ4740: Add prom support
    Date
    This patch adds support for initializing arcs_cmdline on JZ4740 based machines
    and provides a prom_putchar implementation.

    Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
    ---
    arch/mips/jz4740/prom.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 69 insertions(+), 0 deletions(-)
    create mode 100644 arch/mips/jz4740/prom.c

    diff --git a/arch/mips/jz4740/prom.c b/arch/mips/jz4740/prom.c
    new file mode 100644
    index 0000000..6518aee
    --- /dev/null
    +++ b/arch/mips/jz4740/prom.c
    @@ -0,0 +1,69 @@
    +/*
    + * 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 *)(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));
    +}
    --
    1.5.6.5


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