Initial import

1 files changed, 152 insertions, 0 deletions

diff --git a/arch/mips/mti-sead3/sead3-init.c b/arch/mips/mti-sead3/sead3-init.c
new file mode 100644
index 000000000..3572ea301
--- /dev/null
+++ b/arch/mips/mti-sead3/sead3-init.c
@@ -0,0 +1,152 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
+ */
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cacheflush.h>
+#include <asm/traps.h>
+#include <asm/mips-boards/generic.h>
+#include <asm/fw/fw.h>
+
+extern char except_vec_nmi;
+extern char except_vec_ejtag_debug;
+
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+static void __init console_config(void)
+{
+	char console_string[40];
+	int baud = 0;
+	char parity = '\0', bits = '\0', flow = '\0';
+	char *s;
+
+	if ((strstr(fw_getcmdline(), "console=")) == NULL) {
+		s = fw_getenv("modetty0");
+		if (s) {
+			while (*s >= '0' && *s <= '9')
+				baud = baud*10 + *s++ - '0';
+			if (*s == ',')
+				s++;
+			if (*s)
+				parity = *s++;
+			if (*s == ',')
+				s++;
+			if (*s)
+				bits = *s++;
+			if (*s == ',')
+				s++;
+			if (*s == 'h')
+				flow = 'r';
+		}
+		if (baud == 0)
+			baud = 38400;
+		if (parity != 'n' && parity != 'o' && parity != 'e')
+			parity = 'n';
+		if (bits != '7' && bits != '8')
+			bits = '8';
+		if (flow == '\0')
+			flow = 'r';
+		sprintf(console_string, " console=ttyS0,%d%c%c%c", baud,
+			parity, bits, flow);
+		strcat(fw_getcmdline(), console_string);
+	}
+}
+#endif
+
+static void __init mips_nmi_setup(void)
+{
+	void *base;
+
+	base = cpu_has_veic ?
+		(void *)(CAC_BASE + 0xa80) :
+		(void *)(CAC_BASE + 0x380);
+#ifdef CONFIG_CPU_MICROMIPS
+	/*
+	 * Decrement the exception vector address by one for microMIPS.
+	 */
+	memcpy(base, (&except_vec_nmi - 1), 0x80);
+
+	/*
+	 * This is a hack. We do not know if the boot loader was built with
+	 * microMIPS instructions or not. If it was not, the NMI exception
+	 * code at 0x80000a80 will be taken in MIPS32 mode. The hand coded
+	 * assembly below forces us into microMIPS mode if we are a pure
+	 * microMIPS kernel. The assembly instructions are:
+	 *
+	 *  3C1A8000   lui       k0,0x8000
+	 *  375A0381   ori       k0,k0,0x381
+	 *  03400008   jr        k0
+	 *  00000000   nop
+	 *
+	 * The mode switch occurs by jumping to the unaligned exception
+	 * vector address at 0x80000381 which would have been 0x80000380
+	 * in MIPS32 mode. The jump to the unaligned address transitions
+	 * us into microMIPS mode.
+	 */
+	if (!cpu_has_veic) {
+		void *base2 = (void *)(CAC_BASE + 0xa80);
+		*((unsigned int *)base2) = 0x3c1a8000;
+		*((unsigned int *)base2 + 1) = 0x375a0381;
+		*((unsigned int *)base2 + 2) = 0x03400008;
+		*((unsigned int *)base2 + 3) = 0x00000000;
+		flush_icache_range((unsigned long)base2,
+			(unsigned long)base2 + 0x10);
+	}
+#else
+	memcpy(base, &except_vec_nmi, 0x80);
+#endif
+	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
+}
+
+static void __init mips_ejtag_setup(void)
+{
+	void *base;
+
+	base = cpu_has_veic ?
+		(void *)(CAC_BASE + 0xa00) :
+		(void *)(CAC_BASE + 0x300);
+#ifdef CONFIG_CPU_MICROMIPS
+	/* Deja vu... */
+	memcpy(base, (&except_vec_ejtag_debug - 1), 0x80);
+	if (!cpu_has_veic) {
+		void *base2 = (void *)(CAC_BASE + 0xa00);
+		*((unsigned int *)base2) = 0x3c1a8000;
+		*((unsigned int *)base2 + 1) = 0x375a0301;
+		*((unsigned int *)base2 + 2) = 0x03400008;
+		*((unsigned int *)base2 + 3) = 0x00000000;
+		flush_icache_range((unsigned long)base2,
+			(unsigned long)base2 + 0x10);
+	}
+#else
+	memcpy(base, &except_vec_ejtag_debug, 0x80);
+#endif
+	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
+}
+
+void __init prom_init(void)
+{
+	board_nmi_handler_setup = mips_nmi_setup;
+	board_ejtag_handler_setup = mips_ejtag_setup;
+
+	fw_init_cmdline();
+#ifdef CONFIG_EARLY_PRINTK
+	if ((strstr(fw_getcmdline(), "console=ttyS0")) != NULL)
+		fw_init_early_console(0);
+	else if ((strstr(fw_getcmdline(), "console=ttyS1")) != NULL)
+		fw_init_early_console(1);
+#endif
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+	if ((strstr(fw_getcmdline(), "console=")) == NULL)
+		strcat(fw_getcmdline(), " console=ttyS0,38400n8r");
+	console_config();
+#endif
+}
+
+void __init prom_free_prom_memory(void)
+{
+}