cpu.c

/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
 *
 * 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 <asm-mips/mipsregs.h>
#include <asm-mips/cacheops.h>
#include <common.h>
#include <command.h>
#include <asm/mipsregs.h>
#include <rt_mmap.h>

#define cache_op(op,addr)						\
	 __asm__ __volatile__(						\
	"       .set    push                                    \n"	\
	"       .set    noreorder                               \n"	\
	"       .set    mips3\n\t                               \n"	\
	"       cache   %0, %1                                  \n"	\
	"       .set    pop                                     \n"	\
	:								\
	: "i" (op), "R" (*(unsigned char *)(addr)))


#if defined(RT6855A_FPGA_BOARD) || defined(RT6855A_ASIC_BOARD)
int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	ra_outl(RALINK_TIMER_BASE + 0x2c, 0x1);		//timer3 load value
	ra_or(RALINK_TIMER_BASE, (1 << 5) | (1 << 25));	//timer3 enabled as watchdog
	return 1;
}
#else

#define SOFTRES_REG (RALINK_SYSCTL_BASE + 0x0034)
#define GORESET		(0x01)

int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	*(volatile unsigned int*)(SOFTRES_REG) = GORESET;
	return 1;
}
#endif

#ifdef CONFIG_SYS_CACHELINE_SIZE

static inline unsigned long icache_line_size(void)
{
	return CONFIG_SYS_CACHELINE_SIZE;
}

static inline unsigned long dcache_line_size(void)
{
	return CONFIG_SYS_CACHELINE_SIZE;
}

#else /* !CONFIG_SYS_CACHELINE_SIZE */

static inline unsigned long icache_line_size(void)
{
	unsigned long conf1, il;
	conf1 = read_c0_config1();
	il = (conf1 & MIPS_CONF1_IL) >> MIPS_CONF1_IL_SHIFT;
	if (!il)
		return 0;
	return 2 << il;
}

static inline unsigned long dcache_line_size(void)
{
	unsigned long conf1, dl;
	conf1 = read_c0_config1();
	dl = (conf1 & MIPS_CONF1_DL) >> MIPS_CONF1_DL_SHIFT;
	if (!dl)
		return 0;
	return 2 << dl;
}

#endif /* !CONFIG_SYS_CACHELINE_SIZE */

void flush_cache (ulong start_addr, ulong size)
{
	unsigned long ilsize = icache_line_size();
	unsigned long dlsize = dcache_line_size();
	unsigned long addr, aend;

	/* aend will be miscalculated when size is zero, so we return here */
	if (size == 0)
		return;

	addr = start_addr & ~(dlsize - 1);
	aend = (start_addr + size - 1) & ~(dlsize - 1);

	if (ilsize == dlsize) {
		/* flush I-cache & D-cache simultaneously */
		while (1) {
			cache_op(HIT_WRITEBACK_INV_D, addr);
			cache_op(HIT_INVALIDATE_I, addr);
			if (addr == aend)
				break;
			addr += dlsize;
		}
		return;
	}

	/* flush D-cache */
	while (1) {
		cache_op(HIT_WRITEBACK_INV_D, addr);
		if (addr == aend)
			break;
		addr += dlsize;
	}

	/* flush I-cache */
	addr = start_addr & ~(ilsize - 1);
	aend = (start_addr + size - 1) & ~(ilsize - 1);
	while (1) {
		cache_op(HIT_INVALIDATE_I, addr);
		if (addr == aend)
			break;
		addr += ilsize;
	}
}
#ifdef RT2880_U_BOOT_CMD_OPEN

void write_one_tlb( int index, u32 pagemask, u32 hi, u32 low0, u32 low1 ){
	write_32bit_cp0_register(CP0_ENTRYLO0, low0);
	write_32bit_cp0_register(CP0_PAGEMASK, pagemask);
	write_32bit_cp0_register(CP0_ENTRYLO1, low1);
	write_32bit_cp0_register(CP0_ENTRYHI, hi);
	write_32bit_cp0_register(CP0_INDEX, index);
	tlb_write_indexed();
}
#endif

void flush_dcache_range(ulong start_addr, ulong stop)
{
	unsigned long lsize = dcache_line_size();
	unsigned long addr = start_addr & ~(lsize - 1);
	unsigned long aend = (stop - 1) & ~(lsize - 1);

	while (1) {
		cache_op(HIT_WRITEBACK_INV_D, addr);
		if (addr == aend)
			break;
		addr += lsize;
	}
}

void invalidate_dcache_range(ulong start_addr, ulong stop)
{
	unsigned long lsize = dcache_line_size();
	unsigned long addr = start_addr & ~(lsize - 1);
	unsigned long aend = (stop - 1) & ~(lsize - 1);

	while (1) {
		cache_op(HIT_INVALIDATE_D, addr);
		if (addr == aend)
			break;
		addr += lsize;
	}
}