[people/ms/u-boot.git] / lib_blackfin / string.c

/*
 * U-boot - string.c Contains library routines.
 *
 * Copyright (c) 2005-2008 Analog Devices Inc.
 *
 * (C) Copyright 2000-2004
 * 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., 51 Franklin St, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */

#include <common.h>
#include <config.h>
#include <asm/blackfin.h>
#include <asm/io.h>
#include <asm/mach-common/bits/dma.h>

char *strcpy(char *dest, const char *src)
{
	char *xdest = dest;
	char temp = 0;

	__asm__ __volatile__ (
		"1:\t%2 = B [%1++] (Z);\n\t"
		"B [%0++] = %2;\n\t"
		"CC = %2;\n\t"
		"if cc jump 1b (bp);\n"
		: "=a"(dest), "=a"(src), "=d"(temp)
		: "0"(dest), "1"(src), "2"(temp)
		: "memory");

	return xdest;
}

char *strncpy(char *dest, const char *src, size_t n)
{
	char *xdest = dest;
	char temp = 0;

	if (n == 0)
		return xdest;

	__asm__ __volatile__ (
		"1:\t%3 = B [%1++] (Z);\n\t"
		"B [%0++] = %3;\n\t"
		"CC = %3;\n\t"
		"if ! cc jump 2f;\n\t"
		"%2 += -1;\n\t"
		"CC = %2 == 0;\n\t"
		"if ! cc jump 1b (bp);\n"
		"2:\n"
		: "=a"(dest), "=a"(src), "=da"(n), "=d"(temp)
		: "0"(dest), "1"(src), "2"(n), "3"(temp)
		: "memory");

	return xdest;
}

int strcmp(const char *cs, const char *ct)
{
	char __res1, __res2;

	__asm__ (
		"1:\t%2 = B[%0++] (Z);\n\t"	/* get *cs */
		"%3 = B[%1++] (Z);\n\t"	/* get *ct */
		"CC = %2 == %3;\n\t"	/* compare a byte */
		"if ! cc jump 2f;\n\t"	/* not equal, break out */
		"CC = %2;\n\t"	/* at end of cs? */
		"if cc jump 1b (bp);\n\t"	/* no, keep going */
		"jump.s 3f;\n"	/* strings are equal */
		"2:\t%2 = %2 - %3;\n"	/* *cs - *ct */
		"3:\n"
		: "=a"(cs), "=a"(ct), "=d"(__res1), "=d"(__res2)
		: "0"(cs), "1"(ct));

	return __res1;
}

int strncmp(const char *cs, const char *ct, size_t count)
{
	char __res1, __res2;

	if (!count)
		return 0;

	__asm__(
		"1:\t%3 = B[%0++] (Z);\n\t"	/* get *cs */
		"%4 = B[%1++] (Z);\n\t"	/* get *ct */
		"CC = %3 == %4;\n\t"	/* compare a byte */
		"if ! cc jump 3f;\n\t"	/* not equal, break out */
		"CC = %3;\n\t"	/* at end of cs? */
		"if ! cc jump 4f;\n\t"	/* yes, all done */
		"%2 += -1;\n\t"	/* no, adjust count */
		"CC = %2 == 0;\n\t" "if ! cc jump 1b;\n"	/* more to do, keep going */
		"2:\t%3 = 0;\n\t"	/* strings are equal */
		"jump.s    4f;\n" "3:\t%3 = %3 - %4;\n"	/* *cs - *ct */
		"4:"
		: "=a"(cs), "=a"(ct), "=da"(count), "=d"(__res1), "=d"(__res2)
		: "0"(cs), "1"(ct), "2"(count));

	return __res1;
}

#ifdef bfin_write_MDMA1_D0_IRQ_STATUS
# define bfin_write_MDMA_D0_IRQ_STATUS bfin_write_MDMA1_D0_IRQ_STATUS
# define bfin_write_MDMA_D0_START_ADDR bfin_write_MDMA1_D0_START_ADDR
# define bfin_write_MDMA_D0_X_COUNT    bfin_write_MDMA1_D0_X_COUNT
# define bfin_write_MDMA_D0_X_MODIFY   bfin_write_MDMA1_D0_X_MODIFY
# define bfin_write_MDMA_D0_CONFIG     bfin_write_MDMA1_D0_CONFIG
# define bfin_write_MDMA_S0_START_ADDR bfin_write_MDMA1_S0_START_ADDR
# define bfin_write_MDMA_S0_X_COUNT    bfin_write_MDMA1_S0_X_COUNT
# define bfin_write_MDMA_S0_X_MODIFY   bfin_write_MDMA1_S0_X_MODIFY
# define bfin_write_MDMA_S0_CONFIG     bfin_write_MDMA1_S0_CONFIG
# define bfin_write_MDMA_D0_IRQ_STATUS bfin_write_MDMA1_D0_IRQ_STATUS
# define bfin_read_MDMA_D0_IRQ_STATUS  bfin_read_MDMA1_D0_IRQ_STATUS
#endif
/* This version misbehaves for count values of 0 and 2^16+.
 * Perhaps we should detect that ?  Nowhere do we actually
 * use dma memcpy for those types of lengths though ...
 */
void dma_memcpy_nocache(void *dst, const void *src, size_t count)
{
	/* Disable DMA in case it's still running (older u-boot's did not
	 * always turn them off).  Do it before the if statement below so
	 * we can be cheap and not do a SSYNC() due to the forced abort.
	 */
	bfin_write_MDMA_D0_CONFIG(0);
	bfin_write_MDMA_S0_CONFIG(0);
	bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN | DMA_DONE | DMA_ERR);

	/* Scratchpad cannot be a DMA source or destination */
	if (((unsigned long)src >= L1_SRAM_SCRATCH &&
	     (unsigned long)src < L1_SRAM_SCRATCH_END) ||
	    ((unsigned long)dst >= L1_SRAM_SCRATCH &&
	     (unsigned long)dst < L1_SRAM_SCRATCH_END))
		hang();

	/* Copy sram functions from sdram to sram */
	/* Setup destination start address */
	bfin_write_MDMA_D0_START_ADDR(dst);
	/* Setup destination xcount */
	bfin_write_MDMA_D0_X_COUNT(count);
	/* Setup destination xmodify */
	bfin_write_MDMA_D0_X_MODIFY(1);

	/* Setup Source start address */
	bfin_write_MDMA_S0_START_ADDR(src);
	/* Setup Source xcount */
	bfin_write_MDMA_S0_X_COUNT(count);
	/* Setup Source xmodify */
	bfin_write_MDMA_S0_X_MODIFY(1);

	/* Enable source DMA */
	bfin_write_MDMA_S0_CONFIG(DMAEN);
	bfin_write_MDMA_D0_CONFIG(WNR | DMAEN | DI_EN);
	SSYNC();

	while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
		continue;

	bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN | DMA_DONE | DMA_ERR);
	bfin_write_MDMA_D0_CONFIG(0);
	bfin_write_MDMA_S0_CONFIG(0);
}
/* We should do a dcache invalidate on the destination after the dma, but since
 * we lack such hardware capability, we'll flush/invalidate the destination
 * before the dma and bank on the idea that u-boot is single threaded.
 */
void *dma_memcpy(void *dst, const void *src, size_t count)
{
	if (dcache_status()) {
		blackfin_dcache_flush_range(src, src + count);
		blackfin_dcache_flush_invalidate_range(dst, dst + count);
	}

	dma_memcpy_nocache(dst, src, count);

	if (icache_status())
		blackfin_icache_flush_range(dst, dst + count);

	return dst;
}

/*
 * memcpy - Copy one area of memory to another
 * @dest: Where to copy to
 * @src: Where to copy from
 * @count: The size of the area.
 *
 * We need to have this wrapper in memcpy() as common code may call memcpy()
 * to load up L1 regions.  Consider loading an ELF which has sections with
 * LMA's pointing to L1.  The common code ELF loader will simply use memcpy()
 * to move the ELF's sections into the right place.  We need to catch that
 * here and redirect to dma_memcpy().
 */
extern void *memcpy_ASM(void *dst, const void *src, size_t count);
void *memcpy(void *dst, const void *src, size_t count)
{
	if (!count)
		return dst;

	if (addr_bfin_on_chip_mem(dst)) {
		/* L1 is the destination */
		return dma_memcpy(dst, src, count);

	} else if (addr_bfin_on_chip_mem(src)) {
		/* L1 is the source */
		return dma_memcpy(dst, src, count);

	} else
		/* No L1 is involved, so just call regular memcpy */
		return memcpy_ASM(dst, src, count);
}
Commit	Line	Data
9171fc81 MF	1	/*
	2	* U-boot - string.c Contains library routines.
	3	*
d31eb385	4	* Copyright (c) 2005-2008 Analog Devices Inc.
9171fc81 MF	5	*
	6	* (C) Copyright 2000-2004
	7	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	8	*
	9	* See file CREDITS for list of people who contributed to this
	10	* project.
	11	*
	12	* This program is free software; you can redistribute it and/or
	13	* modify it under the terms of the GNU General Public License as
	14	* published by the Free Software Foundation; either version 2 of
	15	* the License, or (at your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
	25	* MA 02110-1301 USA
	26	*/
	27
	28	#include <common.h>
	29	#include <config.h>
	30	#include <asm/blackfin.h>
	31	#include <asm/io.h>
	32	#include <asm/mach-common/bits/dma.h>
	33
	34	char strcpy(char dest, const char *src)
	35	{
	36	char *xdest = dest;
	37	char temp = 0;
	38
	39	__asm__ __volatile__ (
	40	"1:\t%2 = B [%1++] (Z);\n\t"
	41	"B [%0++] = %2;\n\t"
	42	"CC = %2;\n\t"
	43	"if cc jump 1b (bp);\n"
	44	: "=a"(dest), "=a"(src), "=d"(temp)
	45	: "0"(dest), "1"(src), "2"(temp)
	46	: "memory");
	47
	48	return xdest;
	49	}
	50
	51	char strncpy(char dest, const char *src, size_t n)
	52	{
	53	char *xdest = dest;
	54	char temp = 0;
	55
	56	if (n == 0)
	57	return xdest;
	58
	59	__asm__ __volatile__ (
	60	"1:\t%3 = B [%1++] (Z);\n\t"
	61	"B [%0++] = %3;\n\t"
	62	"CC = %3;\n\t"
	63	"if ! cc jump 2f;\n\t"
	64	"%2 += -1;\n\t"
	65	"CC = %2 == 0;\n\t"
	66	"if ! cc jump 1b (bp);\n"
	67	"2:\n"
	68	: "=a"(dest), "=a"(src), "=da"(n), "=d"(temp)
69	: "0"(dest), "1"(src), "2"(n), "3"(temp)
70	: "memory");
71
72	return xdest;
73	}
74
75	int strcmp(const char cs, const char ct)
76	{
77	char __res1, __res2;
78
79	__asm__ (
80	"1:\t%2 = B[%0++] (Z);\n\t" /* get cs /
81	"%3 = B[%1++] (Z);\n\t" /* get ct /
82	"CC = %2 == %3;\n\t" /* compare a byte */
83	"if ! cc jump 2f;\n\t" /* not equal, break out */
84	"CC = %2;\n\t" /* at end of cs? */
85	"if cc jump 1b (bp);\n\t" /* no, keep going */
86	"jump.s 3f;\n" /* strings are equal */
87	"2:\t%2 = %2 - %3;\n" /* cs - ct */
88	"3:\n"
89	: "=a"(cs), "=a"(ct), "=d"(__res1), "=d"(__res2)
90	: "0"(cs), "1"(ct));
91
92	return __res1;
93	}
94
95	int strncmp(const char cs, const char ct, size_t count)
96	{
97	char __res1, __res2;
98
99	if (!count)
100	return 0;
101
102	__asm__(
103	"1:\t%3 = B[%0++] (Z);\n\t" /* get cs /
104	"%4 = B[%1++] (Z);\n\t" /* get ct /
105	"CC = %3 == %4;\n\t" /* compare a byte */
106	"if ! cc jump 3f;\n\t" /* not equal, break out */
107	"CC = %3;\n\t" /* at end of cs? */
108	"if ! cc jump 4f;\n\t" /* yes, all done */
109	"%2 += -1;\n\t" /* no, adjust count */
110	"CC = %2 == 0;\n\t" "if ! cc jump 1b;\n" /* more to do, keep going */
111	"2:\t%3 = 0;\n\t" /* strings are equal */
112	"jump.s 4f;\n" "3:\t%3 = %3 - %4;\n" /* cs - ct */
113	"4:"
114	: "=a"(cs), "=a"(ct), "=da"(count), "=d"(__res1), "=d"(__res2)
115	: "0"(cs), "1"(ct), "2"(count));
116
117	return __res1;
118	}
119
120	#ifdef bfin_write_MDMA1_D0_IRQ_STATUS
121	# define bfin_write_MDMA_D0_IRQ_STATUS bfin_write_MDMA1_D0_IRQ_STATUS
122	# define bfin_write_MDMA_D0_START_ADDR bfin_write_MDMA1_D0_START_ADDR
123	# define bfin_write_MDMA_D0_X_COUNT bfin_write_MDMA1_D0_X_COUNT
124	# define bfin_write_MDMA_D0_X_MODIFY bfin_write_MDMA1_D0_X_MODIFY
125	# define bfin_write_MDMA_D0_CONFIG bfin_write_MDMA1_D0_CONFIG
126	# define bfin_write_MDMA_S0_START_ADDR bfin_write_MDMA1_S0_START_ADDR
127	# define bfin_write_MDMA_S0_X_COUNT bfin_write_MDMA1_S0_X_COUNT
128	# define bfin_write_MDMA_S0_X_MODIFY bfin_write_MDMA1_S0_X_MODIFY
129	# define bfin_write_MDMA_S0_CONFIG bfin_write_MDMA1_S0_CONFIG
130	# define bfin_write_MDMA_D0_IRQ_STATUS bfin_write_MDMA1_D0_IRQ_STATUS
131	# define bfin_read_MDMA_D0_IRQ_STATUS bfin_read_MDMA1_D0_IRQ_STATUS
132	#endif
d31eb385 MF	133	/* This version misbehaves for count values of 0 and 2^16+.
	134	* Perhaps we should detect that ? Nowhere do we actually
	135	* use dma memcpy for those types of lengths though ...
	136	*/
21d63136	137	void dma_memcpy_nocache(void dst, const void src, size_t count)
9171fc81	138	{
e347c092 MF	139	/* Disable DMA in case it's still running (older u-boot's did not
	140	* always turn them off). Do it before the if statement below so
	141	* we can be cheap and not do a SSYNC() due to the forced abort.
	142	*/
	143	bfin_write_MDMA_D0_CONFIG(0);
	144	bfin_write_MDMA_S0_CONFIG(0);
	145	bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN \| DMA_DONE \| DMA_ERR);
	146
d31eb385 MF	147	/* Scratchpad cannot be a DMA source or destination */
	148	if (((unsigned long)src >= L1_SRAM_SCRATCH &&
	149	(unsigned long)src < L1_SRAM_SCRATCH_END) \|\|
	150	((unsigned long)dst >= L1_SRAM_SCRATCH &&
	151	(unsigned long)dst < L1_SRAM_SCRATCH_END))
	152	hang();
	153
9171fc81 MF	154	/* Copy sram functions from sdram to sram */
	155	/* Setup destination start address */
	156	bfin_write_MDMA_D0_START_ADDR(dst);
	157	/* Setup destination xcount */
	158	bfin_write_MDMA_D0_X_COUNT(count);
	159	/* Setup destination xmodify */
	160	bfin_write_MDMA_D0_X_MODIFY(1);
	161
	162	/* Setup Source start address */
	163	bfin_write_MDMA_S0_START_ADDR(src);
	164	/* Setup Source xcount */
	165	bfin_write_MDMA_S0_X_COUNT(count);
	166	/* Setup Source xmodify */
	167	bfin_write_MDMA_S0_X_MODIFY(1);
	168
	169	/* Enable source DMA */
	170	bfin_write_MDMA_S0_CONFIG(DMAEN);
e347c092	171	bfin_write_MDMA_D0_CONFIG(WNR \| DMAEN \| DI_EN);
21d63136	172	SSYNC();
9171fc81	173
e347c092	174	while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
21d63136 MF	175	continue;
21d63136 MF	176
e347c092	177	bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN \| DMA_DONE \| DMA_ERR);
21d63136 MF	178	bfin_write_MDMA_D0_CONFIG(0);
	179	bfin_write_MDMA_S0_CONFIG(0);
	180	}
05b75e48 MF	181	/* We should do a dcache invalidate on the destination after the dma, but since
	182	* we lack such hardware capability, we'll flush/invalidate the destination
	183	* before the dma and bank on the idea that u-boot is single threaded.
	184	*/
21d63136 MF	185	void dma_memcpy(void dst, const void *src, size_t count)
21d63136 MF	186	{
05b75e48	187	if (dcache_status()) {
21d63136	188	blackfin_dcache_flush_range(src, src + count);
05b75e48 MF	189	blackfin_dcache_flush_invalidate_range(dst, dst + count);
05b75e48 MF	190	}
21d63136 MF	191
21d63136 MF	192	dma_memcpy_nocache(dst, src, count);
9171fc81 MF	193
	194	if (icache_status())
	195	blackfin_icache_flush_range(dst, dst + count);
	196
9171fc81 MF	197	return dst;
	198	}
	199
	200	/*
	201	* memcpy - Copy one area of memory to another
	202	* @dest: Where to copy to
	203	* @src: Where to copy from
	204	* @count: The size of the area.
	205	*
	206	* We need to have this wrapper in memcpy() as common code may call memcpy()
	207	* to load up L1 regions. Consider loading an ELF which has sections with
	208	* LMA's pointing to L1. The common code ELF loader will simply use memcpy()
	209	* to move the ELF's sections into the right place. We need to catch that
	210	* here and redirect to dma_memcpy().
	211	*/
	212	extern void memcpy_ASM(void dst, const void *src, size_t count);
	213	void memcpy(void dst, const void *src, size_t count)
	214	{
	215	if (!count)
	216	return dst;
	217
	218	if (addr_bfin_on_chip_mem(dst)) {
	219	/* L1 is the destination */
	220	return dma_memcpy(dst, src, count);
	221
	222	} else if (addr_bfin_on_chip_mem(src)) {
	223	/* L1 is the source */
	224	return dma_memcpy(dst, src, count);
	225
	226	} else
	227	/* No L1 is involved, so just call regular memcpy */
	228	return memcpy_ASM(dst, src, count);
	229	}