128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
/*
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* dma.c
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*
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*
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* This file is part of BaS_gcc.
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*
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* BaS_gcc is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* BaS_gcc is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with BaS_gcc. If not, see <http://www.gnu.org/licenses/>.
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*
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* Created on: 26.02.2013
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* Author: Markus Fröschle
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*/
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#include "dma.h"
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#include <MCD_dma.h>
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#include "mcd_initiators.h"
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#include "bas_printf.h"
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#include "bas_string.h"
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#include "cache.h"
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#if MACHINE_FIREBEE
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#include "firebee.h"
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#elif MACHINE_M5484LITE
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#include "m5484l.h"
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#endif /* MACHINE_FIREBEE */
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extern char _SYS_SRAM[];
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#define SYS_SRAM &_SYS_SRAM[0]
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void print_sp(void)
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{
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register char *sp asm("sp");
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xprintf("sp=%x\r\n", sp);
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}
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void *dma_memcpy(void *dst, void *src, size_t n)
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{
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int ret;
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volatile int32_t time;
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volatile int32_t start;
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volatile int32_t end;
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start = MCF_SLT0_SCNT;
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ret = MCD_startDma(1, src, 4, dst, 4, n, 4, DMA_ALWAYS, 0, MCD_SINGLE_DMA, 0);
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if (ret == MCD_OK)
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{
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xprintf("DMA on channel 1 successfully started\r\n");
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}
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do
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{
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ret = MCD_dmaStatus(1);
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#ifdef _NOT_USED_ /* suppress annoying printout for now */
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switch (ret)
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{
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case MCD_NO_DMA:
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xprintf("MCD_NO_DMA: no DMA active on this channel\r\n");
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return NULL;
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break;
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case MCD_IDLE:
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xprintf("MCD_IDLE: DMA defined but not active (initiator not ready)\r\n");
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break;
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case MCD_RUNNING:
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xprintf("MCD_RUNNING: DMA active and working on this channel\r\n");
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break;
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case MCD_PAUSED:
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xprintf("MCD_PAUSED: DMA defined and enabled, but currently paused\r\n");
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break;
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case MCD_HALTED:
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xprintf("MCD_HALTED: DMA killed\r\n");
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return NULL;
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break;
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case MCD_DONE:
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xprintf("MCD_DONE: DMA finished\r\n");
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break;
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case MCD_CHANNEL_INVALID:
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xprintf("MCD_CHANNEL_INVALID: invalid DMA channel\r\n");
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return NULL;
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break;
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default:
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xprintf("unknown DMA status %d\r\n", ret);
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break;
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}
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#endif
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} while (ret != MCD_DONE);
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end = MCF_SLT0_SCNT;
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time = (start - end) / (SYSCLK / 1000) / 1000;
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xprintf("took %d ms (%f Mbytes/second)\r\n", time, n / (float) time / 1000.0);
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return dst;
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}
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int dma_init(void)
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{
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int res;
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int version;
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char *long_version;
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xprintf("MCD DMA API initialization: ");
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res = MCD_initDma((dmaRegs *) &_MBAR[0x8000], SYS_SRAM, MCD_RELOC_TASKS | MCD_COMM_PREFETCH_EN);
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if (res != MCD_OK)
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{
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xprintf("DMA API initialization failed (0x%x)\r\n", res);
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return 0;
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}
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version = MCD_getVersion(&long_version);
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xprintf("DMA API version %d.%d initialized. Tasks are at %p\r\n", version / 0xff, version % 0xff, SYS_SRAM);
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// test
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dma_memcpy((void *) 0x10000, (void *) 0xe0000000, 0x00100000); /* copy one megabyte of flash to RAM */
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xprintf("DMA finished\r\n");
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return 0;
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}
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