setup.c

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/*
 * File:         arch/blackfin/kernel/setup.c
 * Based on:
 * Author:
 *
 * Created:
 * Description:
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/delay.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/tty.h>

#include <linux/ext2_fs.h>
#include <linux/cramfs_fs.h>
#include <linux/romfs_fs.h>

#include <asm/cplb.h>
#include <asm/cacheflush.h>
#include <asm/blackfin.h>
#include <asm/cplbinit.h>
#include <asm/div64.h>
#include <asm/fixed_code.h>
#include <asm/early_printk.h>

u16 _bfin_swrst;

unsigned long memory_start, memory_end, physical_mem_end;
unsigned long reserved_mem_dcache_on;
unsigned long reserved_mem_icache_on;
EXPORT_SYMBOL(memory_start);
EXPORT_SYMBOL(memory_end);
EXPORT_SYMBOL(physical_mem_end);
EXPORT_SYMBOL(_ramend);

#ifdef CONFIG_MTD_UCLINUX
unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
unsigned long _ebss;
EXPORT_SYMBOL(memory_mtd_end);
EXPORT_SYMBOL(memory_mtd_start);
EXPORT_SYMBOL(mtd_size);
#endif

char __initdata command_line[COMMAND_LINE_SIZE];

void __init bf53x_cache_init(void)
{
#if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
	generate_cpl_tables();
#endif

#ifdef CONFIG_BFIN_ICACHE
	bfin_icache_init();
	printk(KERN_INFO "Instruction Cache Enabled\n");
#endif

#ifdef CONFIG_BFIN_DCACHE
	bfin_dcache_init();
	printk(KERN_INFO "Data Cache Enabled"
# if defined CONFIG_BFIN_WB
		" (write-back)"
# elif defined CONFIG_BFIN_WT
		" (write-through)"
# endif
		"\n");
#endif
}

void __init bf53x_relocate_l1_mem(void)
{
	unsigned long l1_code_length;
	unsigned long l1_data_a_length;
	unsigned long l1_data_b_length;

	l1_code_length = _etext_l1 - _stext_l1;
	if (l1_code_length > L1_CODE_LENGTH)
		l1_code_length = L1_CODE_LENGTH;
	/* cannot complain as printk is not available as yet.
	 * But we can continue booting and complain later!
	 */

	/* Copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
	dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);

	l1_data_a_length = _ebss_l1 - _sdata_l1;
	if (l1_data_a_length > L1_DATA_A_LENGTH)
		l1_data_a_length = L1_DATA_A_LENGTH;

	/* Copy _sdata_l1 to _ebss_l1 to L1 data bank A SRAM */
	dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);

	l1_data_b_length = _ebss_b_l1 - _sdata_b_l1;
	if (l1_data_b_length > L1_DATA_B_LENGTH)
		l1_data_b_length = L1_DATA_B_LENGTH;

	/* Copy _sdata_b_l1 to _ebss_b_l1 to L1 data bank B SRAM */
	dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
			l1_data_a_length, l1_data_b_length);

}

/*
 * Initial parsing of the command line.  Currently, we support:
 *  - Controlling the linux memory size: mem=xxx[KMG]
 *  - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
 *       $ -> reserved memory is dcacheable
 *       # -> reserved memory is icacheable
 */
static __init void parse_cmdline_early(char *cmdline_p)
{
	char c = ' ', *to = cmdline_p;
	unsigned int memsize;
	for (;;) {
		if (c == ' ') {

			if (!memcmp(to, "mem=", 4)) {
				to += 4;
				memsize = memparse(to, &to);
				if (memsize)
					_ramend = memsize;

			} else if (!memcmp(to, "max_mem=", 8)) {
				to += 8;
				memsize = memparse(to, &to);
				if (memsize) {
					physical_mem_end = memsize;
					if (*to != ' ') {
						if (*to == '$'
						    || *(to + 1) == '$')
							reserved_mem_dcache_on =
							    1;
						if (*to == '#'
						    || *(to + 1) == '#')
							reserved_mem_icache_on =
							    1;
					}
				}
			} else if (!memcmp(to, "earlyprintk=", 12)) {
				to += 12;
				setup_early_printk(to);
			}
		}
		c = *(to++);
		if (!c)
			break;
	}
}

void __init setup_arch(char **cmdline_p)
{
	int bootmap_size;
	unsigned long l1_length, sclk, cclk;
#ifdef CONFIG_MTD_UCLINUX
	unsigned long mtd_phys = 0;
#endif

#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif

#if defined(CONFIG_CMDLINE_BOOL)
	strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
	command_line[sizeof(command_line) - 1] = 0;
#endif

	/* Keep a copy of command line */
	*cmdline_p = &command_line[0];
	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
	boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';

	/* setup memory defaults from the user config */
	physical_mem_end = 0;
	_ramend = CONFIG_MEM_SIZE * 1024 * 1024;

	parse_cmdline_early(&command_line[0]);

	cclk = get_cclk();
	sclk = get_sclk();

#if !defined(CONFIG_BFIN_KERNEL_CLOCK)
	if (ANOMALY_05000273 && cclk == sclk)
		panic("ANOMALY 05000273, SCLK can not be same as CCLK");
#endif

#ifdef BF561_FAMILY
	if (ANOMALY_05000266) {
		bfin_read_IMDMA_D0_IRQ_STATUS();
		bfin_read_IMDMA_D1_IRQ_STATUS();
	}
#endif

	printk(KERN_INFO "Hardware Trace ");
	if (bfin_read_TBUFCTL() & 0x1 )
		printk("Active ");
	else
		printk("Off ");
	if (bfin_read_TBUFCTL() & 0x2)
		printk("and Enabled\n");
	else
	printk("and Disabled\n");


#if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
	/* we need to initialize the Flashrom device here since we might
	 * do things with flash early on in the boot
	 */
	flash_probe();
#endif

	if (physical_mem_end == 0)
		physical_mem_end = _ramend;

	/* by now the stack is part of the init task */
	memory_end = _ramend - DMA_UNCACHED_REGION;

	_ramstart = (unsigned long)__bss_stop;
	memory_start = PAGE_ALIGN(_ramstart);

#if defined(CONFIG_MTD_UCLINUX)
	/* generic memory mapped MTD driver */
	memory_mtd_end = memory_end;

	mtd_phys = _ramstart;
	mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));

# if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
	if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
		mtd_size =
		    PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
# endif

# if defined(CONFIG_CRAMFS)
	if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
		mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
# endif

# if defined(CONFIG_ROMFS_FS)
	if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
	    && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
		mtd_size =
		    PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
#  if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
	/* Due to a Hardware Anomaly we need to limit the size of usable
	 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
	 * 05000263 - Hardware loop corrupted when taking an ICPLB exception
	 */
#   if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
	if (memory_end >= 56 * 1024 * 1024)
		memory_end = 56 * 1024 * 1024;
#   else
	if (memory_end >= 60 * 1024 * 1024)
		memory_end = 60 * 1024 * 1024;
#   endif				/* CONFIG_DEBUG_HUNT_FOR_ZERO */
#  endif				/* ANOMALY_05000263 */
# endif				/* CONFIG_ROMFS_FS */

	memory_end -= mtd_size;

	if (mtd_size == 0) {
		console_init();
		panic("Don't boot kernel without rootfs attached.\n");
	}

	/* Relocate MTD image to the top of memory after the uncached memory area */
	dma_memcpy((char *)memory_end, __bss_stop, mtd_size);

	memory_mtd_start = memory_end;
	_ebss = memory_mtd_start;	/* define _ebss for compatible */
#endif				/* CONFIG_MTD_UCLINUX */

#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
	/* Due to a Hardware Anomaly we need to limit the size of usable
	 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
	 * 05000263 - Hardware loop corrupted when taking an ICPLB exception
	 */
#if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
	if (memory_end >= 56 * 1024 * 1024)
		memory_end = 56 * 1024 * 1024;
#else
	if (memory_end >= 60 * 1024 * 1024)
		memory_end = 60 * 1024 * 1024;
#endif				/* CONFIG_DEBUG_HUNT_FOR_ZERO */
	printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
#endif				/* ANOMALY_05000263 */

#if !defined(CONFIG_MTD_UCLINUX)
	memory_end -= SIZE_4K; /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
#endif
	init_mm.start_code = (unsigned long)_stext;
	init_mm.end_code = (unsigned long)_etext;
	init_mm.end_data = (unsigned long)_edata;
	init_mm.brk = (unsigned long)0;

	init_leds();

	_bfin_swrst = bfin_read_SWRST();

	if (_bfin_swrst & RESET_DOUBLE)
		printk(KERN_INFO "Recovering from Double Fault event\n");
	else if (_bfin_swrst & RESET_WDOG)
		printk(KERN_INFO "Recovering from Watchdog event\n");
	else if (_bfin_swrst & RESET_SOFTWARE)
		printk(KERN_NOTICE "Reset caused by Software reset\n");

	printk(KERN_INFO "Blackfin support (C) 2004-2007 Analog Devices, Inc.\n");
	if (bfin_compiled_revid() == 0xffff)
		printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
	else if (bfin_compiled_revid() == -1)
		printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
	else
		printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
	if (bfin_revid() != bfin_compiled_revid()) {
		if (bfin_compiled_revid() == -1)
			printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
			       bfin_revid());
		else if (bfin_compiled_revid() != 0xffff)
			printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
			       bfin_compiled_revid(), bfin_revid());
	}
	if (bfin_revid() < SUPPORTED_REVID)
		printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
		       CPU, bfin_revid());
	printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");

	printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
	       cclk / 1000000,  sclk / 1000000);

	if (ANOMALY_05000273 && (cclk >> 1) <= sclk)
		printk("\n\n\nANOMALY_05000273: CCLK must be >= 2*SCLK !!!\n\n\n");