include/asm-blackfin/blackfin_local.h

/*
 * U-boot - blackfin_local.h
 *
 * Copyright (c) 2005-2007 Analog Devices Inc.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */

#ifndef __BLACKFIN_LOCAL_H__
#define __BLACKFIN_LOCAL_H__

#define LO(con32) ((con32) & 0xFFFF)
#define lo(con32) ((con32) & 0xFFFF)
#define HI(con32) (((con32) >> 16) & 0xFFFF)
#define hi(con32) (((con32) >> 16) & 0xFFFF)

#define OFFSET_(x) (x & 0x0000FFFF)
#define MK_BMSK_(x) (1 << x)

/* Ideally this should be USEC not MSEC, but the USEC multiplication
 * likes to overflow 32bit quantities which is all our assembler
 * currently supports ;(
 */
#define USEC_PER_MSEC 1000
#define MSEC_PER_SEC 1000
#define BFIN_SCLK (100000000)
#define SCLK_TO_MSEC(sclk) ((MSEC_PER_SEC * ((sclk) / USEC_PER_MSEC)) / (BFIN_SCLK / USEC_PER_MSEC))
#define MSEC_TO_SCLK(msec) ((((BFIN_SCLK / USEC_PER_MSEC) * (msec)) / MSEC_PER_SEC) * USEC_PER_MSEC)

#include <asm/linkage.h>

#ifndef __ASSEMBLY__
# ifdef SHARED_RESOURCES
#  include <asm/shared_resources.h>
# endif

# include <linux/types.h>

extern u_long get_sclk(void);

# define bfin_revid() (*pCHIPID >> 28)

extern void blackfin_icache_flush_range(const void *, const void *);
extern void blackfin_dcache_flush_range(const void *, const void *);
extern void blackfin_dcache_invalidate_range(const void *, const void *);

/* Use DMA to move data from on chip to external memory.  While this is
 * required for only L1 instruction (it is not directly readable by the
 * core via data loads), it isn't a huge performance issue for other
 * regions (it's probably even faster than core load/stores).  However,
 * the DMA engine does not have access to the L1 scratchpad, and we
 * cannot use DMA inside of the MMR space.
 */
# define addr_bfin_on_chip_mem(addr) \
	(((unsigned long)(addr) >= 0xef000000 && (unsigned long)addr < SYSMMR_BASE) && \
	 !((unsigned long)(addr) >= L1_SRAM_SCRATCH && \
	   (unsigned long)(addr) < L1_SRAM_SCRATCH_END))

# include <asm/system.h>

#if ANOMALY_05000198
# define NOP_PAD_ANOMALY_05000198 "nop;"
#else
# define NOP_PAD_ANOMALY_05000198
#endif

#define bfin_read8(addr) ({ \
	uint8_t __v; \
	__asm__ __volatile__( \
		NOP_PAD_ANOMALY_05000198 \
		"%0 = b[%1] (z);" \
		: "=d" (__v) \
		: "a" (addr) \
	); \
	__v; })

#define bfin_read16(addr) ({ \
	uint16_t __v; \
	__asm__ __volatile__( \
		NOP_PAD_ANOMALY_05000198 \
		"%0 = w[%1] (z);" \
		: "=d" (__v) \
		: "a" (addr) \
	); \
	__v; })

#define bfin_read32(addr) ({ \
	uint32_t __v; \
	__asm__ __volatile__( \
		NOP_PAD_ANOMALY_05000198 \
		"%0 = [%1];" \
		: "=d" (__v) \
		: "a" (addr) \
	); \
	__v; })

#define bfin_readPTR(addr) bfin_read32(addr)

#define bfin_write8(addr, val) \
	__asm__ __volatile__( \
		NOP_PAD_ANOMALY_05000198 \
		"b[%0] = %1;" \
		: \
		: "a" (addr), "d" (val) \
		: "memory" \
	)

#define bfin_write16(addr, val) \
	__asm__ __volatile__( \
		NOP_PAD_ANOMALY_05000198 \
		"w[%0] = %1;" \
		: \
		: "a" (addr), "d" (val) \
		: "memory" \
	)

#define bfin_write32(addr, val) \
	__asm__ __volatile__( \
		NOP_PAD_ANOMALY_05000198 \
		"[%0] = %1;" \
		: \
		: "a" (addr), "d" (val) \
		: "memory" \
	)

#define bfin_writePTR(addr, val) bfin_write32(addr, val)

/* SSYNC implementation for C file */
static inline void SSYNC(void)
{
	int _tmp;
	if (ANOMALY_05000312)
		__asm__ __volatile__(
			"cli %0;"
			"nop;"
			"nop;"
			"ssync;"
			"sti %0;"
			: "=d" (_tmp)
		);
	else if (ANOMALY_05000244)
		__asm__ __volatile__(
			"nop;"
			"nop;"
			"nop;"
			"ssync;"
		);
	else
		__asm__ __volatile__("ssync;");
}

/* CSYNC implementation for C file */
static inline void CSYNC(void)
{
	int _tmp;
	if (ANOMALY_05000312)
		__asm__ __volatile__(
			"cli %0;"
			"nop;"
			"nop;"
			"csync;"
			"sti %0;"
			: "=d" (_tmp)
		);
	else if (ANOMALY_05000244)
		__asm__ __volatile__(
			"nop;"
			"nop;"
			"nop;"
			"csync;"
		);
	else
		__asm__ __volatile__("csync;");
}

#else  /* __ASSEMBLY__ */

/* SSYNC & CSYNC implementations for assembly files */

#define ssync(x) SSYNC(x)
#define csync(x) CSYNC(x)

#if ANOMALY_05000312
#define SSYNC(scratch) cli scratch; nop; nop; SSYNC; sti scratch;
#define CSYNC(scratch) cli scratch; nop; nop; CSYNC; sti scratch;

#elif ANOMALY_05000244
#define SSYNC(scratch) nop; nop; nop; SSYNC;
#define CSYNC(scratch) nop; nop; nop; CSYNC;

#else
#define SSYNC(scratch) SSYNC;
#define CSYNC(scratch) CSYNC;

#endif /* ANOMALY_05000312 & ANOMALY_05000244 handling */

#endif /* __ASSEMBLY__ */

#endif