blob: ab71285bb638a796da2638697d9147f0ba4a9477 [file] [log] [blame]
Mike Frysinger9171fc82008-03-30 15:46:13 -04001/*
2 * U-boot - string.c Contains library routines.
3 *
Mike Frysingerd31eb382008-08-07 15:30:49 -04004 * Copyright (c) 2005-2008 Analog Devices Inc.
Mike Frysinger9171fc82008-03-30 15:46:13 -04005 *
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
34char *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
51char *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
75int 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
95int 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
Mike Frysingerd31eb382008-08-07 15:30:49 -0400133/* 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 */
Mike Frysinger9171fc82008-03-30 15:46:13 -0400137static void *dma_memcpy(void *dst, const void *src, size_t count)
138{
Mike Frysingerd31eb382008-08-07 15:30:49 -0400139 /* Scratchpad cannot be a DMA source or destination */
140 if (((unsigned long)src >= L1_SRAM_SCRATCH &&
141 (unsigned long)src < L1_SRAM_SCRATCH_END) ||
142 ((unsigned long)dst >= L1_SRAM_SCRATCH &&
143 (unsigned long)dst < L1_SRAM_SCRATCH_END))
144 hang();
145
Mike Frysinger9171fc82008-03-30 15:46:13 -0400146 if (dcache_status())
147 blackfin_dcache_flush_range(src, src + count);
148
149 bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
150
151 /* Copy sram functions from sdram to sram */
152 /* Setup destination start address */
153 bfin_write_MDMA_D0_START_ADDR(dst);
154 /* Setup destination xcount */
155 bfin_write_MDMA_D0_X_COUNT(count);
156 /* Setup destination xmodify */
157 bfin_write_MDMA_D0_X_MODIFY(1);
158
159 /* Setup Source start address */
160 bfin_write_MDMA_S0_START_ADDR(src);
161 /* Setup Source xcount */
162 bfin_write_MDMA_S0_X_COUNT(count);
163 /* Setup Source xmodify */
164 bfin_write_MDMA_S0_X_MODIFY(1);
165
166 /* Enable source DMA */
167 bfin_write_MDMA_S0_CONFIG(DMAEN);
168 SSYNC();
169
170 bfin_write_MDMA_D0_CONFIG(WNR | DMAEN);
171
172 while (bfin_read_MDMA_D0_IRQ_STATUS() & DMA_RUN)
173 bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() | DMA_DONE | DMA_ERR);
174 bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() | DMA_DONE | DMA_ERR);
175
176 if (icache_status())
177 blackfin_icache_flush_range(dst, dst + count);
178
179 if (dcache_status())
180 blackfin_dcache_invalidate_range(dst, dst + count);
181
182 return dst;
183}
184
185/*
186 * memcpy - Copy one area of memory to another
187 * @dest: Where to copy to
188 * @src: Where to copy from
189 * @count: The size of the area.
190 *
191 * We need to have this wrapper in memcpy() as common code may call memcpy()
192 * to load up L1 regions. Consider loading an ELF which has sections with
193 * LMA's pointing to L1. The common code ELF loader will simply use memcpy()
194 * to move the ELF's sections into the right place. We need to catch that
195 * here and redirect to dma_memcpy().
196 */
197extern void *memcpy_ASM(void *dst, const void *src, size_t count);
198void *memcpy(void *dst, const void *src, size_t count)
199{
200 if (!count)
201 return dst;
202
203 if (addr_bfin_on_chip_mem(dst)) {
204 /* L1 is the destination */
205 return dma_memcpy(dst, src, count);
206
207 } else if (addr_bfin_on_chip_mem(src)) {
208 /* L1 is the source */
209 return dma_memcpy(dst, src, count);
210
211 } else
212 /* No L1 is involved, so just call regular memcpy */
213 return memcpy_ASM(dst, src, count);
214}