Add AVR32 architecture support

Patch by Haavard Skinnemoen, 6 Sep 2006 16:23:02 +0200

This patch adds common infrastructure code for the Atmel AVR32
architecture. See doc/README.AVR32 for details.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

6 files changed, 711 insertions, 0 deletions

diff --git a/lib_avr32/Makefile b/lib_avr32/Makefile
new file mode 100644
index 0000000..5b6300b
--- /dev/null
+++ b/lib_avr32/Makefile
@@ -0,0 +1,47 @@
+#
+# (C) Copyright 2002-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2004-2006 Atmel Corporation
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# 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., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(ARCH).a
+
+SOBJS	= memset.o
+
+COBJS	= board.o interrupts.o avr32_linux.o div64.o
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+
+$(LIB):	$(obj).depend $(OBJS)
+	$(AR) crv $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/lib_avr32/avr32_linux.c b/lib_avr32/avr32_linux.c
new file mode 100644
index 0000000..d128dfb
--- /dev/null
+++ b/lib_avr32/avr32_linux.c
@@ -0,0 +1,315 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <command.h>
+#include <image.h>
+#include <zlib.h>
+#include <asm/byteorder.h>
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/arch/platform.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+extern int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
+
+/* CPU-specific hook to allow flushing of caches, etc. */
+extern void prepare_to_boot(void);
+
+#ifdef CONFIG_SHOW_BOOT_PROGRESS
+# include <status_led.h>
+# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
+#else
+# define SHOW_BOOT_PROGRESS(arg)
+#endif
+
+extern image_header_t header;		/* from cmd_bootm.c */
+
+static struct tag *setup_start_tag(struct tag *params)
+{
+	params->hdr.tag = ATAG_CORE;
+	params->hdr.size = tag_size(tag_core);
+
+	params->u.core.flags = 0;
+	params->u.core.pagesize = 4096;
+	params->u.core.rootdev = 0;
+
+	return tag_next(params);
+}
+
+static struct tag *setup_memory_tags(struct tag *params)
+{
+	bd_t *bd = gd->bd;
+	int i;
+
+	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+		params->hdr.tag = ATAG_MEM;
+		params->hdr.size = tag_size(tag_mem_range);
+
+		params->u.mem_range.addr = bd->bi_dram[i].start;
+		params->u.mem_range.size = bd->bi_dram[i].size;
+
+		params = tag_next(params);
+	}
+
+	return params;
+}
+
+static struct tag *setup_commandline_tag(struct tag *params, char *cmdline)
+{
+	if (!cmdline)
+		return params;
+
+	/* eat leading white space */
+	while (*cmdline == ' ') cmdline++;
+
+	/*
+	 * Don't include tags for empty command lines; let the kernel
+	 * use its default command line.
+	 */
+	if (*cmdline == '\0')
+		return params;
+
+	params->hdr.tag = ATAG_CMDLINE;
+	params->hdr.size =
+		(sizeof (struct tag_header) + strlen(cmdline) + 1 + 3) >> 2;
+	strcpy(params->u.cmdline.cmdline, cmdline);
+
+	return tag_next(params);
+}
+
+static struct tag *setup_ramdisk_tag(struct tag *params,
+				     unsigned long rd_start,
+				     unsigned long rd_end)
+{
+	if (rd_start == rd_end)
+		return params;
+
+	params->hdr.tag = ATAG_RDIMG;
+	params->hdr.size = tag_size(tag_mem_range);
+
+	params->u.mem_range.addr = rd_start;
+	params->u.mem_range.size = rd_end - rd_start;
+
+	return tag_next(params);
+}
+
+static struct tag *setup_clock_tags(struct tag *params)
+{
+	params->hdr.tag = ATAG_CLOCK;
+	params->hdr.size = tag_size(tag_clock);
+	params->u.clock.clock_id = ACLOCK_BOOTCPU;
+	params->u.clock.clock_flags = 0;
+	params->u.clock.clock_hz = gd->cpu_hz;
+
+#ifdef CONFIG_AT32AP7000
+	/*
+	 * New kernels don't need this, but we should be backwards
+	 * compatible for a while...
+	 */
+	params = tag_next(params);
+
+	params->hdr.tag = ATAG_CLOCK;
+	params->hdr.size = tag_size(tag_clock);
+	params->u.clock.clock_id = ACLOCK_HSB;
+	params->u.clock.clock_flags = 0;
+	params->u.clock.clock_hz = pm_get_clock_freq(CLOCK_HSB);
+#endif
+
+	return tag_next(params);
+}
+
+static struct tag *setup_ethernet_tag(struct tag *params,
+				      char *addr, int index)
+{
+	char *s, *e;
+	int i;
+
+	params->hdr.tag = ATAG_ETHERNET;
+	params->hdr.size = tag_size(tag_ethernet);
+
+	params->u.ethernet.mac_index = index;
+	params->u.ethernet.mii_phy_addr = gd->bd->bi_phy_id[index];
+
+	s = addr;
+	for (i = 0; i < 6; i++) {
+		params->u.ethernet.hw_address[i] = simple_strtoul(s, &e, 16);
+		s = e + 1;
+	}
+
+	return tag_next(params);
+}
+
+static struct tag *setup_ethernet_tags(struct tag *params)
+{
+	char name[16] = "ethaddr";
+	char *addr;
+	int i = 0;
+
+	do {
+		addr = getenv(name);
+		if (addr)
+			params = setup_ethernet_tag(params, addr, i);
+		sprintf(name, "eth%daddr", ++i);
+	} while (i < 4);
+
+	return params;
+}
+
+static void setup_end_tag(struct tag *params)
+{
+	params->hdr.tag = ATAG_NONE;
+	params->hdr.size = 0;
+}
+
+void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
+		    unsigned long addr, unsigned long *len_ptr, int verify)
+{
+	unsigned long data, len = 0;
+	unsigned long initrd_start, initrd_end;
+	unsigned long image_start, image_end;
+	unsigned long checksum;
+	void (*theKernel)(int magic, void *tagtable);
+	image_header_t *hdr;
+	struct tag *params, *params_start;
+	char *commandline = getenv("bootargs");
+
+	hdr = (image_header_t *)addr;
+	image_start = addr;
+	image_end = addr + hdr->ih_size;
+
+	theKernel = (void *)ntohl(hdr->ih_ep);
+
+	/*
+	 * Check if there is an initrd image
+	 */
+	if (argc >= 3) {
+		SHOW_BOOT_PROGRESS(9);
+
+		addr = simple_strtoul(argv[2], NULL, 16);
+
+		printf("## Loading RAMDISK image at %08lx ...\n", addr);
+
+		memcpy(&header, (char *)addr, sizeof(header));
+		hdr = &header;
+
+		if (ntohl(hdr->ih_magic) != IH_MAGIC) {
+			puts("Bad Magic Number\n");
+			SHOW_BOOT_PROGRESS(-10);
+			do_reset(cmdtp, flag, argc, argv);
+		}
+
+		data = (unsigned long)hdr;
+		len = sizeof(*hdr);
+		checksum = ntohl(hdr->ih_hcrc);
+		hdr->ih_hcrc = 0;
+
+		if (crc32(0, (unsigned char *)data, len) != checksum) {
+			puts("Bad Header Checksum\n");
+			SHOW_BOOT_PROGRESS(-11);
+			do_reset(cmdtp, flag, argc, argv);
+		}
+
+		SHOW_BOOT_PROGRESS(10);
+
+		print_image_hdr(hdr);
+
+		data = addr + sizeof(header);
+		len = ntohl(hdr->ih_size);
+
+		if (verify) {
+			unsigned long csum = 0;
+
+			puts("   Verifying Checksum ... ");
+			csum = crc32(0, (unsigned char *)data, len);
+			if (csum != ntohl(hdr->ih_dcrc)) {
+				puts("Bad Data CRC\n");
+				SHOW_BOOT_PROGRESS(-12);
+				do_reset(cmdtp, flag, argc, argv);
+			}
+			puts("OK\n");
+		}
+
+		SHOW_BOOT_PROGRESS(11);
+
+		if ((hdr->ih_os != IH_OS_LINUX) ||
+		    (hdr->ih_arch != IH_CPU_AVR32) ||
+		    (hdr->ih_type != IH_TYPE_RAMDISK)) {
+			puts("Not a Linux/AVR32 RAMDISK image\n");
+			SHOW_BOOT_PROGRESS(-13);
+			do_reset(cmdtp, flag, argc, argv);
+		}
+	} else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
+		ulong tail = ntohl (len_ptr[0]) % 4;
+		int i;
+
+		SHOW_BOOT_PROGRESS (13);
+
+		/* skip kernel length and terminator */
+		data = (ulong) (&len_ptr[2]);
+		/* skip any additional image length fields */
+		for (i = 1; len_ptr[i]; ++i)
+			data += 4;
+		/* add kernel length, and align */
+		data += ntohl (len_ptr[0]);
+		if (tail) {
+			data += 4 - tail;
+		}
+
+		len = ntohl (len_ptr[1]);
+	} else {
+		/* no initrd image */
+		SHOW_BOOT_PROGRESS(14);
+		len = data = 0;
+	}
+
+	if (data) {
+		initrd_start = data;
+		initrd_end = initrd_start + len;
+	} else {
+		initrd_start = 0;
+		initrd_end = 0;
+	}
+
+	SHOW_BOOT_PROGRESS(15);
+
+	params = params_start = (struct tag *)gd->bd->bi_boot_params;
+	params = setup_start_tag(params);
+	params = setup_memory_tags(params);
+	if (initrd_start) {
+		params = setup_ramdisk_tag(params,
+					   PHYSADDR(initrd_start),
+					   PHYSADDR(initrd_end));
+	}
+	params = setup_commandline_tag(params, commandline);
+	params = setup_clock_tags(params);
+	params = setup_ethernet_tags(params);
+	setup_end_tag(params);
+
+	printf("\nStarting kernel at %p (params at %p)...\n\n",
+	       theKernel, params_start);
+
+	prepare_to_boot();
+
+	theKernel(ATAG_MAGIC, params_start);
+}
diff --git a/lib_avr32/board.c b/lib_avr32/board.c
new file mode 100644
index 0000000..02c106b
--- /dev/null
+++ b/lib_avr32/board.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <command.h>
+#include <malloc.h>
+#include <devices.h>
+#include <version.h>
+#include <net.h>
+
+#include <asm/initcalls.h>
+#include <asm/sections.h>
+
+#ifndef CONFIG_IDENT_STRING
+#define CONFIG_IDENT_STRING ""
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+const char version_string[] =
+	U_BOOT_VERSION " (" __DATE__ " - " __TIME__ ") " CONFIG_IDENT_STRING;
+
+unsigned long monitor_flash_len;
+
+/*
+ * Begin and end of memory area for malloc(), and current "brk"
+ */
+static unsigned long mem_malloc_start = 0;
+static unsigned long mem_malloc_end = 0;
+static unsigned long mem_malloc_brk = 0;
+
+/* The malloc area is wherever the board wants it to be */
+static void mem_malloc_init(void)
+{
+	mem_malloc_start = CFG_MALLOC_START;
+	mem_malloc_end = CFG_MALLOC_END;
+	mem_malloc_brk = mem_malloc_start;
+
+	printf("malloc: Using memory from 0x%08lx to 0x%08lx\n",
+	       mem_malloc_start, mem_malloc_end);
+
+	memset ((void *)mem_malloc_start, 0,
+		mem_malloc_end - mem_malloc_start);
+}
+
+void *sbrk(ptrdiff_t increment)
+{
+	unsigned long old = mem_malloc_brk;
+	unsigned long new = old + increment;
+
+	if ((new < mem_malloc_start) || (new > mem_malloc_end))
+		return NULL;
+
+	mem_malloc_brk = new;
+	return ((void *)old);
+}
+
+static int init_baudrate(void)
+{
+	char tmp[64];
+	int i;
+
+	i = getenv_r("baudrate", tmp, sizeof(tmp));
+	if (i > 0) {
+		gd->baudrate = simple_strtoul(tmp, NULL, 10);
+	} else {
+		gd->baudrate = CONFIG_BAUDRATE;
+	}
+	return 0;
+}
+
+
+static int display_banner (void)
+{
+	printf ("\n\n%s\n\n", version_string);
+	printf ("U-Boot code: %p -> %p  data: %p -> %p\n",
+		_text, _etext, _data, _end);
+	return 0;
+}
+
+void hang(void)
+{
+	for (;;) ;
+}
+
+static int display_dram_config (void)
+{
+	int i;
+
+	puts ("DRAM Configuration:\n");
+
+	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+		printf ("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
+		print_size (gd->bd->bi_dram[i].size, "\n");
+	}
+
+	return 0;
+}
+
+static void display_flash_config (void)
+{
+	puts ("Flash: ");
+	print_size(gd->bd->bi_flashsize, " ");
+	printf("at address 0x%08lx\n", gd->bd->bi_flashstart);
+}
+
+void start_u_boot (void)
+{
+	gd_t gd_data;
+
+	/* Initialize the global data pointer */
+	memset(&gd_data, 0, sizeof(gd_data));
+	gd = &gd_data;
+
+	monitor_flash_len = _edata - _text;
+
+	/* Perform initialization sequence */
+	cpu_init();
+	timer_init();
+	env_init();
+	init_baudrate();
+	serial_init();
+	console_init_f();
+	display_banner();
+
+	board_init_memories();
+	mem_malloc_init();
+
+	gd->bd = malloc(sizeof(bd_t));
+	memset(gd->bd, 0, sizeof(bd_t));
+	gd->bd->bi_baudrate = gd->baudrate;
+	gd->bd->bi_dram[0].start = CFG_SDRAM_BASE;
+	gd->bd->bi_dram[0].size = gd->sdram_size;
+
+	board_init_info();
+	flash_init();
+
+	if (gd->bd->bi_flashsize)
+		display_flash_config();
+	if (gd->bd->bi_dram[0].size)
+		display_dram_config();
+
+	gd->bd->bi_boot_params = malloc(CFG_BOOTPARAMS_LEN);
+	if (!gd->bd->bi_boot_params)
+		puts("WARNING: Cannot allocate space for boot parameters\n");
+
+	/* initialize environment */
+	env_relocate();
+
+	devices_init();
+	jumptable_init();
+	console_init_r();
+
+	for (;;) {
+		main_loop();
+	}
+}
diff --git a/lib_avr32/div64.c b/lib_avr32/div64.c
new file mode 100644
index 0000000..99726e3
--- /dev/null
+++ b/lib_avr32/div64.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com>
+ *
+ * Based on former do_div() implementation from asm-parisc/div64.h:
+ *	Copyright (C) 1999 Hewlett-Packard Co
+ *	Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ *
+ * Generic C version of 64bit/32bit division and modulo, with
+ * 64bit result and 32bit remainder.
+ *
+ * The fast case for (n>>32 == 0) is handled inline by do_div().
+ *
+ * Code generated for this function might be very inefficient
+ * for some CPUs. __div64_32() can be overridden by linking arch-specific
+ * assembly versions such as arch/ppc/lib/div64.S and arch/sh/lib/div64.S.
+ */
+
+#include <linux/types.h>
+
+#include <asm/div64.h>
+
+uint32_t __div64_32(uint64_t *n, uint32_t base)
+{
+	uint64_t rem = *n;
+	uint64_t b = base;
+	uint64_t res, d = 1;
+	uint32_t high = rem >> 32;
+
+	/* Reduce the thing a bit first */
+	res = 0;
+	if (high >= base) {
+		high /= base;
+		res = (uint64_t) high << 32;
+		rem -= (uint64_t) (high*base) << 32;
+	}
+
+	while ((int64_t)b > 0 && b < rem) {
+		b = b+b;
+		d = d+d;
+	}
+
+	do {
+		if (rem >= b) {
+			rem -= b;
+			res += d;
+		}
+		b >>= 1;
+		d >>= 1;
+	} while (d);
+
+	*n = res;
+	return rem;
+}
diff --git a/lib_avr32/interrupts.c b/lib_avr32/interrupts.c
new file mode 100644
index 0000000..ce538f3
--- /dev/null
+++ b/lib_avr32/interrupts.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2006 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+
+#include <asm/sysreg.h>
+
+void enable_interrupts(void)
+{
+	asm volatile("csrf	%0" : : "n"(SYSREG_GM_OFFSET));
+}
+
+int disable_interrupts(void)
+{
+	unsigned long sr;
+
+	sr = sysreg_read(SR);
+	asm volatile("ssrf	%0" : : "n"(SYSREG_GM_OFFSET));
+
+	return SYSREG_BFEXT(GM, sr);
+}
diff --git a/lib_avr32/memset.S b/lib_avr32/memset.S
new file mode 100644
index 0000000..dc3b09b
--- /dev/null
+++ b/lib_avr32/memset.S
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+	/*
+	 * r12:	void *b
+	 * r11:	int c
+	 * r10:	size_t len
+	 *
+	 * Returns b in r12
+	 */
+	.text
+
+	.global	memset
+	.type	memset, @function
+	.align	2
+memset:
+	mov	r9, r12
+	mov	r8, r12
+	or	r11, r11, r11 << 8
+	andl	r9, 3, COH
+	brne	1f
+
+2:	or	r11, r11, r11 << 16
+	sub	r10, 4
+	brlt	5f
+
+	/* Let's do some real work */
+4:	st.w	r8++, r11
+	sub	r10, 4
+	brge	4b
+
+	/*
+	 * When we get here, we've got less than 4 bytes to set. r10
+	 * might be negative.
+	 */
+5:	sub	r10, -4
+	reteq	r12
+
+	/* Fastpath ends here, exactly 32 bytes from memset */
+
+	/* Handle unaligned count or pointer */
+	bld	r10, 1
+	brcc	6f
+	st.b	r8++, r11
+	st.b	r8++, r11
+	bld	r10, 0
+	retcc	r12
+6:	st.b	r8++, r11
+	mov	pc, lr
+
+	/* Handle unaligned pointer */
+1:	sub	r10, 4
+	brlt	5b
+	add	r10, r9
+	lsl	r9, 1
+	add	pc, r9
+	st.b	r8++, r11
+	st.b	r8++, r11
+	st.b	r8++, r11
+	rjmp	2b
+
+	.size	memset, . - memset