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_MPC83xx) 37 #define FSL_DMA_MR_DEFAULT (FSL_DMA_MR_CTM_DIRECT | FSL_DMA_MR_DMSEN) 38 #else 39 #define FSL_DMA_MR_DEFAULT (FSL_DMA_MR_BWC_DIS | FSL_DMA_MR_CTM_DIRECT) 40 #endif 41 42 43 #if defined(CONFIG_MPC83xx) 44 dma83xx_t *dma_base = (void *)(CONFIG_SYS_MPC83xx_DMA_ADDR); 45 #elif defined(CONFIG_MPC85xx) 46 ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR); 47 #elif defined(CONFIG_MPC86xx) 48 ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC86xx_DMA_ADDR); 49 #else 50 #error "Freescale DMA engine not supported on your processor" 51 #endif 52 53 static void dma_sync(void) 54 { 55 #if defined(CONFIG_MPC85xx) 56 asm("sync; isync; msync"); 57 #elif defined(CONFIG_MPC86xx) 58 asm("sync; isync"); 59 #endif 60 } 61 62 static void out_dma32(volatile unsigned *addr, int val) 63 { 64 #if defined(CONFIG_MPC83xx) 65 out_le32(addr, val); 66 #else 67 out_be32(addr, val); 68 #endif 69 } 70 71 static uint in_dma32(volatile unsigned *addr) 72 { 73 #if defined(CONFIG_MPC83xx) 74 return in_le32(addr); 75 #else 76 return in_be32(addr); 77 #endif 78 } 79 80 static uint dma_check(void) { 81 volatile fsl_dma_t *dma = &dma_base->dma[0]; 82 uint status; 83 84 /* While the channel is busy, spin */ 85 do { 86 status = in_dma32(&dma->sr); 87 } while (status & FSL_DMA_SR_CB); 88 89 /* clear MR[CS] channel start bit */ 90 out_dma32(&dma->mr, in_dma32(&dma->mr) & ~FSL_DMA_MR_CS); 91 dma_sync(); 92 93 if (status != 0) 94 printf ("DMA Error: status = %x\n", status); 95 96 return status; 97 } 98 99 #if !defined(CONFIG_MPC83xx) 100 void dma_init(void) { 101 volatile fsl_dma_t *dma = &dma_base->dma[0]; 102 103 out_dma32(&dma->satr, FSL_DMA_SATR_SREAD_SNOOP); 104 out_dma32(&dma->datr, FSL_DMA_DATR_DWRITE_SNOOP); 105 out_dma32(&dma->sr, 0xffffffff); /* clear any errors */ 106 dma_sync(); 107 } 108 #endif 109 110 int dmacpy(phys_addr_t dest, phys_addr_t src, phys_size_t count) { 111 volatile fsl_dma_t *dma = &dma_base->dma[0]; 112 uint xfer_size; 113 114 while (count) { 115 xfer_size = MIN(FSL_DMA_MAX_SIZE, count); 116 117 out_dma32(&dma->dar, (uint) dest); 118 out_dma32(&dma->sar, (uint) src); 119 out_dma32(&dma->bcr, xfer_size); 120 dma_sync(); 121 122 /* Prepare mode register */ 123 out_dma32(&dma->mr, FSL_DMA_MR_DEFAULT); 124 dma_sync(); 125 126 /* Start the transfer */ 127 out_dma32(&dma->mr, FSL_DMA_MR_DEFAULT | FSL_DMA_MR_CS); 128 129 count -= xfer_size; 130 src += xfer_size; 131 dest += xfer_size; 132 133 dma_sync(); 134 135 if (dma_check()) 136 return -1; 137 } 138 139 return 0; 140 } 141 142 /* 143 * 85xx/86xx use dma to initialize SDRAM when !CONFIG_ECC_INIT_VIA_DDRCONTROLLER 144 * while 83xx uses dma to initialize SDRAM when CONFIG_DDR_ECC_INIT_VIA_DMA 145 */ 146 #if ((!defined CONFIG_MPC83xx && defined(CONFIG_DDR_ECC) && \ 147 !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)) || \ 148 (defined(CONFIG_MPC83xx) && defined(CONFIG_DDR_ECC_INIT_VIA_DMA))) 149 void dma_meminit(uint val, uint size) 150 { 151 uint *p = 0; 152 uint i = 0; 153 154 for (*p = 0; p < (uint *)(8 * 1024); p++) { 155 if (((uint)p & 0x1f) == 0) 156 ppcDcbz((ulong)p); 157 158 *p = (uint)CONFIG_MEM_INIT_VALUE; 159 160 if (((uint)p & 0x1c) == 0x1c) 161 ppcDcbf((ulong)p); 162 } 163 164 dmacpy(0x002000, 0, 0x002000); /* 8K */ 165 dmacpy(0x004000, 0, 0x004000); /* 16K */ 166 dmacpy(0x008000, 0, 0x008000); /* 32K */ 167 dmacpy(0x010000, 0, 0x010000); /* 64K */ 168 dmacpy(0x020000, 0, 0x020000); /* 128K */ 169 dmacpy(0x040000, 0, 0x040000); /* 256K */ 170 dmacpy(0x080000, 0, 0x080000); /* 512K */ 171 dmacpy(0x100000, 0, 0x100000); /* 1M */ 172 dmacpy(0x200000, 0, 0x200000); /* 2M */ 173 dmacpy(0x400000, 0, 0x400000); /* 4M */ 174 175 for (i = 1; i < size / 0x800000; i++) 176 dmacpy((0x800000 * i), 0, 0x800000); 177 } 178 #endif 179