1 /* 2 * Copyright 2004,2007,2008 Freescale Semiconductor, Inc. 3 * (C) Copyright 2002, 2003 Motorola Inc. 4 * Xianghua Xiao (X.Xiao@motorola.com) 5 * 6 * (C) Copyright 2000 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., 59 Temple Place, Suite 330, Boston, 25 * MA 02111-1307 USA 26 */ 27 28 #include <config.h> 29 #include <common.h> 30 #include <asm/io.h> 31 #include <asm/fsl_dma.h> 32 33 /* Controller can only transfer 2^26 - 1 bytes at a time */ 34 #define FSL_DMA_MAX_SIZE (0x3ffffff) 35 36 #if defined(CONFIG_MPC85xx) 37 ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR); 38 #elif defined(CONFIG_MPC86xx) 39 ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC86xx_DMA_ADDR); 40 #else 41 #error "Freescale DMA engine not supported on your processor" 42 #endif 43 44 static void dma_sync(void) 45 { 46 #if defined(CONFIG_MPC85xx) 47 asm("sync; isync; msync"); 48 #elif defined(CONFIG_MPC86xx) 49 asm("sync; isync"); 50 #endif 51 } 52 53 static uint dma_check(void) { 54 volatile fsl_dma_t *dma = &dma_base->dma[0]; 55 uint status; 56 57 /* While the channel is busy, spin */ 58 do { 59 status = in_be32(&dma->sr); 60 } while (status & FSL_DMA_SR_CB); 61 62 /* clear MR[CS] channel start bit */ 63 out_be32(&dma->mr, in_be32(&dma->mr) & ~FSL_DMA_MR_CS); 64 dma_sync(); 65 66 if (status != 0) 67 printf ("DMA Error: status = %x\n", status); 68 69 return status; 70 } 71 72 void dma_init(void) { 73 volatile fsl_dma_t *dma = &dma_base->dma[0]; 74 75 out_be32(&dma->satr, FSL_DMA_SATR_SREAD_NO_SNOOP); 76 out_be32(&dma->datr, FSL_DMA_DATR_DWRITE_NO_SNOOP); 77 out_be32(&dma->sr, 0xffffffff); /* clear any errors */ 78 dma_sync(); 79 } 80 81 int dma_xfer(void *dest, uint count, void *src) { 82 volatile fsl_dma_t *dma = &dma_base->dma[0]; 83 uint xfer_size; 84 85 while (count) { 86 xfer_size = MIN(FSL_DMA_MAX_SIZE, count); 87 88 out_be32(&dma->dar, (uint) dest); 89 out_be32(&dma->sar, (uint) src); 90 out_be32(&dma->bcr, xfer_size); 91 92 /* Disable bandwidth control, use direct transfer mode */ 93 out_be32(&dma->mr, FSL_DMA_MR_BWC_DIS | FSL_DMA_MR_CTM_DIRECT); 94 dma_sync(); 95 96 /* Start the transfer */ 97 out_be32(&dma->mr, FSL_DMA_MR_BWC_DIS | 98 FSL_DMA_MR_CTM_DIRECT | 99 FSL_DMA_MR_CS); 100 101 count -= xfer_size; 102 src += xfer_size; 103 dest += xfer_size; 104 105 dma_sync(); 106 107 if (dma_check()) 108 return -1; 109 } 110 111 return 0; 112 } 113