fsl_dma.c
3.94 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2004,2007,2008 Freescale Semiconductor, Inc.
* (C) Copyright 2002, 2003 Motorola Inc.
* Xianghua Xiao (X.Xiao@motorola.com)
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include <config.h>
#include <common.h>
#include <asm/io.h>
#include <asm/fsl_dma.h>
/* Controller can only transfer 2^26 - 1 bytes at a time */
#define FSL_DMA_MAX_SIZE (0x3ffffff)
#if defined(CONFIG_MPC83xx)
#define FSL_DMA_MR_DEFAULT (FSL_DMA_MR_CTM_DIRECT | FSL_DMA_MR_DMSEN)
#else
#define FSL_DMA_MR_DEFAULT (FSL_DMA_MR_BWC_DIS | FSL_DMA_MR_CTM_DIRECT)
#endif
#if defined(CONFIG_MPC83xx)
dma83xx_t *dma_base = (void *)(CONFIG_SYS_MPC83xx_DMA_ADDR);
#elif defined(CONFIG_MPC85xx)
ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR);
#elif defined(CONFIG_MPC86xx)
ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC86xx_DMA_ADDR);
#else
#error "Freescale DMA engine not supported on your processor"
#endif
static void dma_sync(void)
{
#if defined(CONFIG_MPC85xx)
asm("sync; isync; msync");
#elif defined(CONFIG_MPC86xx)
asm("sync; isync");
#endif
}
static void out_dma32(volatile unsigned *addr, int val)
{
#if defined(CONFIG_MPC83xx)
out_le32(addr, val);
#else
out_be32(addr, val);
#endif
}
static uint in_dma32(volatile unsigned *addr)
{
#if defined(CONFIG_MPC83xx)
return in_le32(addr);
#else
return in_be32(addr);
#endif
}
static uint dma_check(void) {
volatile fsl_dma_t *dma = &dma_base->dma[0];
uint status;
/* While the channel is busy, spin */
do {
status = in_dma32(&dma->sr);
} while (status & FSL_DMA_SR_CB);
/* clear MR[CS] channel start bit */
out_dma32(&dma->mr, in_dma32(&dma->mr) & ~FSL_DMA_MR_CS);
dma_sync();
if (status != 0)
printf ("DMA Error: status = %x\n", status);
return status;
}
#if !defined(CONFIG_MPC83xx)
void dma_init(void) {
volatile fsl_dma_t *dma = &dma_base->dma[0];
out_dma32(&dma->satr, FSL_DMA_SATR_SREAD_SNOOP);
out_dma32(&dma->datr, FSL_DMA_DATR_DWRITE_SNOOP);
out_dma32(&dma->sr, 0xffffffff); /* clear any errors */
dma_sync();
}
#endif
int dmacpy(phys_addr_t dest, phys_addr_t src, phys_size_t count) {
volatile fsl_dma_t *dma = &dma_base->dma[0];
uint xfer_size;
while (count) {
xfer_size = min(FSL_DMA_MAX_SIZE, count);
out_dma32(&dma->dar, (u32) (dest & 0xFFFFFFFF));
out_dma32(&dma->sar, (u32) (src & 0xFFFFFFFF));
#if !defined(CONFIG_MPC83xx)
out_dma32(&dma->satr,
in_dma32(&dma->satr) | (u32)((u64)src >> 32));
out_dma32(&dma->datr,
in_dma32(&dma->datr) | (u32)((u64)dest >> 32));
#endif
out_dma32(&dma->bcr, xfer_size);
dma_sync();
/* Prepare mode register */
out_dma32(&dma->mr, FSL_DMA_MR_DEFAULT);
dma_sync();
/* Start the transfer */
out_dma32(&dma->mr, FSL_DMA_MR_DEFAULT | FSL_DMA_MR_CS);
count -= xfer_size;
src += xfer_size;
dest += xfer_size;
dma_sync();
if (dma_check())
return -1;
}
return 0;
}
/*
* 85xx/86xx use dma to initialize SDRAM when !CONFIG_ECC_INIT_VIA_DDRCONTROLLER
* while 83xx uses dma to initialize SDRAM when CONFIG_DDR_ECC_INIT_VIA_DMA
*/
#if ((!defined CONFIG_MPC83xx && defined(CONFIG_DDR_ECC) && \
!defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)) || \
(defined(CONFIG_MPC83xx) && defined(CONFIG_DDR_ECC_INIT_VIA_DMA)))
void dma_meminit(uint val, uint size)
{
uint *p = 0;
uint i = 0;
for (*p = 0; p < (uint *)(8 * 1024); p++) {
if (((uint)p & 0x1f) == 0)
ppcDcbz((ulong)p);
*p = (uint)CONFIG_MEM_INIT_VALUE;
if (((uint)p & 0x1c) == 0x1c)
ppcDcbf((ulong)p);
}
dmacpy(0x002000, 0, 0x002000); /* 8K */
dmacpy(0x004000, 0, 0x004000); /* 16K */
dmacpy(0x008000, 0, 0x008000); /* 32K */
dmacpy(0x010000, 0, 0x010000); /* 64K */
dmacpy(0x020000, 0, 0x020000); /* 128K */
dmacpy(0x040000, 0, 0x040000); /* 256K */
dmacpy(0x080000, 0, 0x080000); /* 512K */
dmacpy(0x100000, 0, 0x100000); /* 1M */
dmacpy(0x200000, 0, 0x200000); /* 2M */
dmacpy(0x400000, 0, 0x400000); /* 4M */
for (i = 1; i < size / 0x800000; i++)
dmacpy((0x800000 * i), 0, 0x800000);
}
#endif