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
|
/*
* Driver for ATMEL DataFlash support
* Author : Hamid Ikdoumi (Atmel)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <asm/arch/hardware.h>
#include <asm/arch/clk.h>
#include <asm/arch/gpio.h>
#include <asm/arch/io.h>
#include <asm/arch/at91_pio.h>
#include <asm/arch/at91_spi.h>
#include <dataflash.h>
#define AT91_SPI_PCS0_DATAFLASH_CARD 0xE /* Chip Select 0: NPCS0%1110 */
#define AT91_SPI_PCS1_DATAFLASH_CARD 0xD /* Chip Select 0: NPCS0%1101 */
#define AT91_SPI_PCS3_DATAFLASH_CARD 0x7 /* Chip Select 3: NPCS3%0111 */
void AT91F_SpiInit(void)
{
/* Reset the SPI */
writel(AT91_SPI_SWRST, AT91_BASE_SPI + AT91_SPI_CR);
/* Configure SPI in Master Mode with No CS selected !!! */
writel(AT91_SPI_MSTR | AT91_SPI_MODFDIS | AT91_SPI_PCS,
AT91_BASE_SPI + AT91_SPI_MR);
/* Configure CS0 */
writel(AT91_SPI_NCPHA |
(AT91_SPI_DLYBS & DATAFLASH_TCSS) |
(AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
((get_mck_clk_rate() / AT91_SPI_CLK) << 8),
AT91_BASE_SPI + AT91_SPI_CSR(0));
#ifdef CONFIG_SYS_DATAFLASH_LOGIC_ADDR_CS1
/* Configure CS1 */
writel(AT91_SPI_NCPHA |
(AT91_SPI_DLYBS & DATAFLASH_TCSS) |
(AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
((get_mck_clk_rate() / AT91_SPI_CLK) << 8),
AT91_BASE_SPI + AT91_SPI_CSR(1));
#endif
#ifdef CONFIG_SYS_DATAFLASH_LOGIC_ADDR_CS3
/* Configure CS3 */
writel(AT91_SPI_NCPHA |
(AT91_SPI_DLYBS & DATAFLASH_TCSS) |
(AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
((get_mck_clk_rate() / AT91_SPI_CLK) << 8),
AT91_BASE_SPI + AT91_SPI_CSR(3));
#endif
/* SPI_Enable */
writel(AT91_SPI_SPIEN, AT91_BASE_SPI + AT91_SPI_CR);
while (!(readl(AT91_BASE_SPI + AT91_SPI_SR) & AT91_SPI_SPIENS));
/*
* Add tempo to get SPI in a safe state.
* Should not be needed for new silicon (Rev B)
*/
udelay(500000);
readl(AT91_BASE_SPI + AT91_SPI_SR);
readl(AT91_BASE_SPI + AT91_SPI_RDR);
}
void AT91F_SpiEnable(int cs)
{
unsigned long mode;
switch (cs) {
case 0: /* Configure SPI CS0 for Serial DataFlash AT45DBxx */
mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
mode &= 0xFFF0FFFF;
writel(mode | ((AT91_SPI_PCS0_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
AT91_BASE_SPI + AT91_SPI_MR);
break;
case 1: /* Configure SPI CS1 for Serial DataFlash AT45DBxx */
mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
mode &= 0xFFF0FFFF;
writel(mode | ((AT91_SPI_PCS1_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
AT91_BASE_SPI + AT91_SPI_MR);
break;
case 3:
mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
mode &= 0xFFF0FFFF;
writel(mode | ((AT91_SPI_PCS3_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
AT91_BASE_SPI + AT91_SPI_MR);
break;
}
/* SPI_Enable */
writel(AT91_SPI_SPIEN, AT91_BASE_SPI + AT91_SPI_CR);
}
unsigned int AT91F_SpiWrite1(AT91PS_DataflashDesc pDesc);
unsigned int AT91F_SpiWrite(AT91PS_DataflashDesc pDesc)
{
unsigned int timeout;
pDesc->state = BUSY;
writel(AT91_SPI_TXTDIS + AT91_SPI_RXTDIS, AT91_BASE_SPI + AT91_SPI_PTCR);
/* Initialize the Transmit and Receive Pointer */
writel((unsigned int)pDesc->rx_cmd_pt, AT91_BASE_SPI + AT91_SPI_RPR);
writel((unsigned int)pDesc->tx_cmd_pt, AT91_BASE_SPI + AT91_SPI_TPR);
/* Intialize the Transmit and Receive Counters */
writel(pDesc->rx_cmd_size, AT91_BASE_SPI + AT91_SPI_RCR);
writel(pDesc->tx_cmd_size, AT91_BASE_SPI + AT91_SPI_TCR);
if (pDesc->tx_data_size != 0) {
/* Initialize the Next Transmit and Next Receive Pointer */
writel((unsigned int)pDesc->rx_data_pt, AT91_BASE_SPI + AT91_SPI_RNPR);
writel((unsigned int)pDesc->tx_data_pt, AT91_BASE_SPI + AT91_SPI_TNPR);
/* Intialize the Next Transmit and Next Receive Counters */
writel(pDesc->rx_data_size, AT91_BASE_SPI + AT91_SPI_RNCR);
writel(pDesc->tx_data_size, AT91_BASE_SPI + AT91_SPI_TNCR);
}
/* arm simple, non interrupt dependent timer */
reset_timer_masked();
timeout = 0;
writel(AT91_SPI_TXTEN + AT91_SPI_RXTEN, AT91_BASE_SPI + AT91_SPI_PTCR);
while (!(readl(AT91_BASE_SPI + AT91_SPI_SR) & AT91_SPI_RXBUFF) &&
((timeout = get_timer_masked()) < CONFIG_SYS_SPI_WRITE_TOUT));
writel(AT91_SPI_TXTDIS + AT91_SPI_RXTDIS, AT91_BASE_SPI + AT91_SPI_PTCR);
pDesc->state = IDLE;
if (timeout >= CONFIG_SYS_SPI_WRITE_TOUT) {
printf("Error Timeout\n\r");
return DATAFLASH_ERROR;
}
return DATAFLASH_OK;
}
|
