2 * U-boot - string.c Contains library routines.
4 * Copyright (c) 2005-2008 Analog Devices Inc.
6 * (C) Copyright 2000-2004
7 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
9 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm/blackfin.h>
18 char *strcpy(char *dest, const char *src)
23 __asm__ __volatile__ (
24 "1:\t%2 = B [%1++] (Z);\n\t"
27 "if cc jump 1b (bp);\n"
28 : "=a"(dest), "=a"(src), "=d"(temp)
29 : "0"(dest), "1"(src), "2"(temp)
35 char *strncpy(char *dest, const char *src, size_t n)
43 __asm__ __volatile__ (
44 "1:\t%3 = B [%1++] (Z);\n\t"
47 "if ! cc jump 2f;\n\t"
50 "if ! cc jump 1b (bp);\n"
52 : "=a"(dest), "=a"(src), "=da"(n), "=d"(temp)
53 : "0"(dest), "1"(src), "2"(n), "3"(temp)
59 int strcmp(const char *cs, const char *ct)
64 "1:\t%2 = B[%0++] (Z);\n\t" /* get *cs */
65 "%3 = B[%1++] (Z);\n\t" /* get *ct */
66 "CC = %2 == %3;\n\t" /* compare a byte */
67 "if ! cc jump 2f;\n\t" /* not equal, break out */
68 "CC = %2;\n\t" /* at end of cs? */
69 "if cc jump 1b (bp);\n\t" /* no, keep going */
70 "jump.s 3f;\n" /* strings are equal */
71 "2:\t%2 = %2 - %3;\n" /* *cs - *ct */
73 : "=a"(cs), "=a"(ct), "=d"(__res1), "=d"(__res2)
79 int strncmp(const char *cs, const char *ct, size_t count)
87 "1:\t%3 = B[%0++] (Z);\n\t" /* get *cs */
88 "%4 = B[%1++] (Z);\n\t" /* get *ct */
89 "CC = %3 == %4;\n\t" /* compare a byte */
90 "if ! cc jump 3f;\n\t" /* not equal, break out */
91 "CC = %3;\n\t" /* at end of cs? */
92 "if ! cc jump 4f;\n\t" /* yes, all done */
93 "%2 += -1;\n\t" /* no, adjust count */
94 "CC = %2 == 0;\n\t" "if ! cc jump 1b;\n" /* more to do, keep going */
95 "2:\t%3 = 0;\n\t" /* strings are equal */
96 "jump.s 4f;\n" "3:\t%3 = %3 - %4;\n" /* *cs - *ct */
98 : "=a"(cs), "=a"(ct), "=da"(count), "=d"(__res1), "=d"(__res2)
99 : "0"(cs), "1"(ct), "2"(count));
104 #ifdef MDMA1_D0_NEXT_DESC_PTR
105 # define MDMA_D0_NEXT_DESC_PTR MDMA1_D0_NEXT_DESC_PTR
106 # define MDMA_S0_NEXT_DESC_PTR MDMA1_S0_NEXT_DESC_PTR
109 static void dma_calc_size(unsigned long ldst, unsigned long lsrc, size_t count,
110 unsigned long *dshift, unsigned long *bpos)
115 /* The max memory DMA memory transfer size is 32 bytes. */
119 /* The max memory DMA memory transfer size is 4 bytes. */
124 *bpos = min(limit, (unsigned long)ffs(ldst | lsrc | count)) - 1;
127 /* This version misbehaves for count values of 0 and 2^16+.
128 * Perhaps we should detect that ? Nowhere do we actually
129 * use dma memcpy for those types of lengths though ...
131 void dma_memcpy_nocache(void *dst, const void *src, size_t count)
133 struct dma_register *mdma_d0 = (void *)MDMA_D0_NEXT_DESC_PTR;
134 struct dma_register *mdma_s0 = (void *)MDMA_S0_NEXT_DESC_PTR;
135 unsigned long ldst = (unsigned long)dst;
136 unsigned long lsrc = (unsigned long)src;
137 unsigned long dshift, bpos;
140 /* Disable DMA in case it's still running (older u-boot's did not
141 * always turn them off). Do it before the if statement below so
142 * we can be cheap and not do a SSYNC() due to the forced abort.
144 bfin_write(&mdma_d0->config, 0);
145 bfin_write(&mdma_s0->config, 0);
146 bfin_write(&mdma_d0->status, DMA_RUN | DMA_DONE | DMA_ERR);
148 /* Scratchpad cannot be a DMA source or destination */
149 if ((lsrc >= L1_SRAM_SCRATCH && lsrc < L1_SRAM_SCRATCH_END) ||
150 (ldst >= L1_SRAM_SCRATCH && ldst < L1_SRAM_SCRATCH_END))
153 dma_calc_size(ldst, lsrc, count, &dshift, &bpos);
154 dsize = bpos << dshift;
159 /* The max memory DMA peripheral transfer size is 4 bytes. */
160 dsize |= min(2UL, bpos) << PSIZE_P;
163 /* Copy sram functions from sdram to sram */
164 /* Setup destination start address */
165 bfin_write(&mdma_d0->start_addr, ldst);
166 /* Setup destination xcount */
167 bfin_write(&mdma_d0->x_count, count);
168 /* Setup destination xmodify */
169 bfin_write(&mdma_d0->x_modify, mod);
171 /* Setup Source start address */
172 bfin_write(&mdma_s0->start_addr, lsrc);
173 /* Setup Source xcount */
174 bfin_write(&mdma_s0->x_count, count);
175 /* Setup Source xmodify */
176 bfin_write(&mdma_s0->x_modify, mod);
178 /* Enable source DMA */
179 bfin_write(&mdma_s0->config, dsize | DMAEN);
180 bfin_write(&mdma_d0->config, dsize | DMAEN | WNR | DI_EN);
183 while (!(bfin_read(&mdma_d0->status) & DMA_DONE))
186 bfin_write(&mdma_d0->status, DMA_RUN | DMA_DONE | DMA_ERR);
187 bfin_write(&mdma_d0->config, 0);
188 bfin_write(&mdma_s0->config, 0);
190 /* We should do a dcache invalidate on the destination after the dma, but since
191 * we lack such hardware capability, we'll flush/invalidate the destination
192 * before the dma and bank on the idea that u-boot is single threaded.
194 void *dma_memcpy(void *dst, const void *src, size_t count)
196 if (dcache_status()) {
197 blackfin_dcache_flush_range(src, src + count);
198 blackfin_dcache_flush_invalidate_range(dst, dst + count);
201 dma_memcpy_nocache(dst, src, count);
204 blackfin_icache_flush_range(dst, dst + count);
210 * memcpy - Copy one area of memory to another
211 * @dest: Where to copy to
212 * @src: Where to copy from
213 * @count: The size of the area.
215 * We need to have this wrapper in memcpy() as common code may call memcpy()
216 * to load up L1 regions. Consider loading an ELF which has sections with
217 * LMA's pointing to L1. The common code ELF loader will simply use memcpy()
218 * to move the ELF's sections into the right place. We need to catch that
219 * here and redirect to dma_memcpy().
221 extern void *memcpy_ASM(void *dst, const void *src, size_t count);
222 void *memcpy(void *dst, const void *src, size_t count)
227 #ifdef CONFIG_CMD_KGDB
228 if (src >= (void *)SYSMMR_BASE) {
229 if (count == 2 && (unsigned long)src % 2 == 0) {
230 u16 mmr = bfin_read16(src);
231 memcpy(dst, &mmr, sizeof(mmr));
234 if (count == 4 && (unsigned long)src % 4 == 0) {
235 u32 mmr = bfin_read32(src);
236 memcpy(dst, &mmr, sizeof(mmr));
239 /* Failed for some reason */
240 memset(dst, 0xad, count);
243 if (dst >= (void *)SYSMMR_BASE) {
244 if (count == 2 && (unsigned long)dst % 2 == 0) {
246 memcpy(&mmr, src, sizeof(mmr));
247 bfin_write16(dst, mmr);
250 if (count == 4 && (unsigned long)dst % 4 == 0) {
252 memcpy(&mmr, src, sizeof(mmr));
253 bfin_write32(dst, mmr);
256 /* Failed for some reason */
257 memset(dst, 0xad, count);
262 /* if L1 is the source or dst, use DMA */
263 if (addr_bfin_on_chip_mem(dst) || addr_bfin_on_chip_mem(src))
264 return dma_memcpy(dst, src, count);
266 /* No L1 is involved, so just call regular memcpy */
267 return memcpy_ASM(dst, src, count);