90 lines
2.3 KiB
Diff
90 lines
2.3 KiB
Diff
From c615e4c64389ef138c6a13afa744e09134db2c82 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Sat, 19 Jun 2010 04:08:17 +0000
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Subject: [PATCH] MIPS: JZ4740: Add prom support
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Add support for initializing arcs_cmdline on JZ4740 based machines and
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provides a prom_putchar implementation.
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Cc: linux-mips@linux-mips.org
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Cc: linux-kernel@vger.kernel.org
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Patchwork: https://patchwork.linux-mips.org/patch/1404/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/jz4740/prom.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++
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1 files changed, 68 insertions(+), 0 deletions(-)
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create mode 100644 arch/mips/jz4740/prom.c
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--- /dev/null
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+++ b/arch/mips/jz4740/prom.c
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@@ -0,0 +1,68 @@
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+/*
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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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+
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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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+
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+#include <linux/serial_reg.h>
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+
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+#include <asm/bootinfo.h>
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+#include <asm/mach-jz4740/base.h>
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+
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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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+
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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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+
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+ *dst = 0;
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+}
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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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+
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+void __init prom_free_prom_memory(void)
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+{
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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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+
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+void prom_putchar(char c)
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+{
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+ uint8_t lsr;
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+
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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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+
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+ writeb(c, UART_REG(UART_TX));
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+}
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