xtensa: add support for the xtensa processor architecture [2/2]

The Xtensa processor architecture is a configurable, extensible,
and synthesizable 32-bit RISC processor core provided by Tensilica, inc.

This is the second part of the basic architecture port, adding the
'arch/xtensa' directory and a readme file.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

1 files changed, 197 insertions, 0 deletions

diff --git a/arch/xtensa/lib/bootm.c b/arch/xtensa/lib/bootm.c
new file mode 100644
index 0000000000..1604bb9536
--- /dev/null
+++ b/arch/xtensa/lib/bootm.c
@@ -0,0 +1,197 @@
+/*
+ * (C) Copyright 2008 - 2013 Tensilica Inc.
+ * (C) Copyright 2014 Cadence Design Systems Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <u-boot/zlib.h>
+#include <asm/byteorder.h>
+#include <asm/addrspace.h>
+#include <asm/bootparam.h>
+#include <asm/cache.h>
+#include <image.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Setup boot-parameters.
+ */
+
+static struct bp_tag *setup_first_tag(struct bp_tag *params)
+{
+	params->id = BP_TAG_FIRST;
+	params->size = sizeof(long);
+	*(unsigned long *)&params->data = BP_VERSION;
+
+	return bp_tag_next(params);
+}
+
+static struct bp_tag *setup_last_tag(struct bp_tag *params)
+{
+	params->id = BP_TAG_LAST;
+	params->size = 0;
+
+	return bp_tag_next(params);
+}
+
+static struct bp_tag *setup_memory_tag(struct bp_tag *params)
+{
+	struct bd_info *bd = gd->bd;
+	struct meminfo *mem;
+
+	params->id = BP_TAG_MEMORY;
+	params->size = sizeof(struct meminfo);
+	mem = (struct meminfo *)params->data;
+	mem->type = MEMORY_TYPE_CONVENTIONAL;
+	mem->start = bd->bi_memstart;
+	mem->end = bd->bi_memstart + bd->bi_memsize;
+
+	printf("   MEMORY:          tag:0x%04x, type:0X%lx, start:0X%lx, end:0X%lx\n",
+	       BP_TAG_MEMORY, mem->type, mem->start, mem->end);
+
+	return bp_tag_next(params);
+}
+
+static struct bp_tag *setup_commandline_tag(struct bp_tag *params,
+					    char *cmdline)
+{
+	int len;
+
+	if (!cmdline)
+		return params;
+
+	len = strlen(cmdline);
+
+	params->id = BP_TAG_COMMAND_LINE;
+	params->size = (len + 3) & -4;
+	strcpy((char *)params->data, cmdline);
+
+	printf("   COMMAND_LINE:    tag:0x%04x, size:%u, data:'%s'\n",
+	       BP_TAG_COMMAND_LINE, params->size, cmdline);
+
+	return bp_tag_next(params);
+}
+
+static struct bp_tag *setup_ramdisk_tag(struct bp_tag *params,
+					unsigned long rd_start,
+					unsigned long rd_end)
+{
+	struct meminfo *mem;
+
+	if (rd_start == rd_end)
+		return params;
+
+	/* Add a single banked memory */
+
+	params->id = BP_TAG_INITRD;
+	params->size = sizeof(struct meminfo);
+
+	mem = (struct meminfo *)params->data;
+	mem->type =  MEMORY_TYPE_CONVENTIONAL;
+	mem->start = PHYSADDR(rd_start);
+	mem->end = PHYSADDR(rd_end);
+
+	printf("   INITRD:          tag:0x%x, type:0X%04lx, start:0X%lx, end:0X%lx\n",
+	       BP_TAG_INITRD, mem->type, mem->start, mem->end);
+
+	return bp_tag_next(params);
+}
+
+static struct bp_tag *setup_serial_tag(struct bp_tag *params)
+{
+	params->id = BP_TAG_SERIAL_BAUDRATE;
+	params->size = sizeof(unsigned long);
+	params->data[0] = gd->baudrate;
+
+	printf("   SERIAL_BAUDRATE: tag:0x%04x, size:%u, baudrate:%lu\n",
+	       BP_TAG_SERIAL_BAUDRATE, params->size, params->data[0]);
+
+	return bp_tag_next(params);
+}
+
+#ifdef CONFIG_OF_LIBFDT
+
+static struct bp_tag *setup_fdt_tag(struct bp_tag *params, void *fdt_start)
+{
+	params->id = BP_TAG_FDT;
+	params->size = sizeof(unsigned long);
+	params->data[0] = (unsigned long)fdt_start;
+
+	printf("   FDT:             tag:0x%04x, size:%u, start:0x%lx\n",
+	       BP_TAG_FDT, params->size, params->data[0]);
+
+	return bp_tag_next(params);
+}
+
+#endif
+
+/*
+ * Boot Linux.
+ */
+
+int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
+{
+	struct bp_tag *params, *params_start;
+	ulong initrd_start, initrd_end;
+	char *commandline = getenv("bootargs");
+
+	if (!(flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)))
+		return 0;
+
+	show_boot_progress(15);
+
+	if (images->rd_start) {
+		initrd_start = images->rd_start;
+		initrd_end = images->rd_end;
+	} else {
+		initrd_start = 0;
+		initrd_end = 0;
+	}
+
+	params_start = (struct bp_tag *)gd->bd->bi_boot_params;
+	params = params_start;
+	params = setup_first_tag(params);
+	params = setup_memory_tag(params);
+	params = setup_commandline_tag(params, commandline);
+	params = setup_serial_tag(params);
+
+	if (initrd_start)
+		params = setup_ramdisk_tag(params, initrd_start, initrd_end);
+
+#ifdef CONFIG_OF_LIBFDT
+	if (images->ft_addr)
+		params = setup_fdt_tag(params, images->ft_addr);
+#endif
+
+	printf("\n");
+
+	params = setup_last_tag(params);
+
+	show_boot_progress(15);
+
+	printf("Transferring Control to Linux @0x%08lx ...\n\n",
+	       (ulong)images->ep);
+
+	flush_dcache_range((unsigned long)params_start, (unsigned long)params);
+
+	if (flag & BOOTM_STATE_OS_FAKE_GO)
+		return 0;
+
+	/*
+	 * _start() in vmlinux expects boot params in register a2.
+	 * NOTE:
+	 *    Disable/delete your u-boot breakpoints before stepping into linux.
+	 */
+	asm volatile ("mov	a2, %0\n\t"
+		      "jx	%1\n\t"
+		      : : "a" (params_start), "a" (images->ep)
+		      : "a2");
+
+	/* Does not return */
+
+	return 1;
+}
+