MIPS: Loongson 1B: Add board support

Adds basic platform devices for Loongson 1B, including serial port,
ethernet, USB, RTC and interrupt handler.

The Loongson 1B UART is compatible with NS16550A, the Loongson 1B GMAC is
built around a Synopsys IP Core.

Use normal instead of enhanced descriptors.

Thanks to Giuseppe for updating the normal descriptor in stmmac driver.
Thanks to Zhao Zhang for implementing the RTC driver.

Signed-off-by: Kelvin Cheung <keguang.zhang@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: wuzhangjin@gmail.com
Cc: zhzhl555@gmail.com
Cc: Kelvin Cheung <keguang.zhang@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/4133/
Patchwork: https://patchwork.linux-mips.org/patch/4134/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 87 insertions, 0 deletions

diff --git a/arch/mips/loongson1/common/prom.c b/arch/mips/loongson1/common/prom.c
new file mode 100644
index 000000000000..1f8e49f9886d
--- /dev/null
+++ b/arch/mips/loongson1/common/prom.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
+ *
+ * Modified from arch/mips/pnx833x/common/prom.c.
+ *
+ * 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.
+ */
+
+#include <linux/serial_reg.h>
+#include <asm/bootinfo.h>
+
+#include <loongson1.h>
+#include <prom.h>
+
+int prom_argc;
+char **prom_argv, **prom_envp;
+unsigned long memsize, highmemsize;
+
+char *prom_getenv(char *envname)
+{
+	char **env = prom_envp;
+	int i;
+
+	i = strlen(envname);
+
+	while (*env) {
+		if (strncmp(envname, *env, i) == 0 && *(*env+i) == '=')
+			return *env + i + 1;
+		env++;
+	}
+
+	return 0;
+}
+
+static inline unsigned long env_or_default(char *env, unsigned long dfl)
+{
+	char *str = prom_getenv(env);
+	return str ? simple_strtol(str, 0, 0) : dfl;
+}
+
+void __init prom_init_cmdline(void)
+{
+	char *c = &(arcs_cmdline[0]);
+	int i;
+
+	for (i = 1; i < prom_argc; i++) {
+		strcpy(c, prom_argv[i]);
+		c += strlen(prom_argv[i]);
+		if (i < prom_argc-1)
+			*c++ = ' ';
+	}
+	*c = 0;
+}
+
+void __init prom_init(void)
+{
+	prom_argc = fw_arg0;
+	prom_argv = (char **)fw_arg1;
+	prom_envp = (char **)fw_arg2;
+
+	prom_init_cmdline();
+
+	memsize = env_or_default("memsize", DEFAULT_MEMSIZE);
+	highmemsize = env_or_default("highmemsize", 0x0);
+}
+
+void __init prom_free_prom_memory(void)
+{
+}
+
+#define PORT(offset)	(u8 *)(KSEG1ADDR(LS1X_UART0_BASE + offset))
+
+void __init prom_putchar(char c)
+{
+	int timeout;
+
+	timeout = 1024;
+
+	while (((readb(PORT(UART_LSR)) & UART_LSR_THRE) == 0)
+			&& (timeout-- > 0))
+		;
+
+	writeb(c, PORT(UART_TX));
+}