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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
* Copyright (C) 2012 Advanced Micro Devices, Inc.
*
* 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; version 2 of the License.
*
* 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.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <arch/io.h>
#include <console/console.h>
#include <spi-generic.h>
#include <spi_flash.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#define AMD_SB_SPI_TX_LEN 8
static uint32_t get_spi_bar(void)
{
device_t dev;
dev = dev_find_slot(0, PCI_DEVFN(0x14, 3));
return pci_read_config32(dev, 0xa0) & ~0x1f;
}
static void reset_internal_fifo_pointer(void)
{
uint32_t spibar = get_spi_bar();
do {
write8((void *)(spibar + 2),
read8((void *)(spibar + 2)) | 0x10);
} while (read8((void *)(spibar + 0xd)) & 0x7);
}
static void execute_command(void)
{
uint32_t spibar = get_spi_bar();
write8((void *)(spibar + 2), read8((void *)(spibar + 2)) | 1);
while ((read8((void *)(spibar + 2)) & 1) &&
(read8((void *)(spibar+3)) & 0x80));
}
static int spi_ctrlr_xfer(const struct spi_slave *slave, const void *dout,
size_t bytesout, void *din, size_t bytesin)
{
/* First byte is cmd which cannot be sent through the FIFO. */
u8 cmd = *(u8 *)dout++;
u8 readoffby1;
u8 readwrite;
size_t count;
uint32_t spibar = get_spi_bar();
bytesout--;
/*
* Check if this is a write command attempting to transfer more bytes
* than the controller can handle. Iterations for writes are not
* supported here because each SPI write command needs to be preceded
* and followed by other SPI commands, and this sequence is controlled
* by the SPI chip driver.
*/
if (bytesout > AMD_SB_SPI_TX_LEN) {
printk(BIOS_DEBUG, "FCH SPI: Too much to write. Does your SPI chip driver use"
" spi_crop_chunk()?\n");
return -1;
}
readoffby1 = bytesout ? 0 : 1;
readwrite = (bytesin + readoffby1) << 4 | bytesout;
write8((void *)(spibar + 1), readwrite);
write8((void *)(spibar + 0), cmd);
reset_internal_fifo_pointer();
for (count = 0; count < bytesout; count++, dout++) {
write8((void *)(spibar + 0x0C), *(u8 *)dout);
}
reset_internal_fifo_pointer();
execute_command();
reset_internal_fifo_pointer();
/* Skip the bytes we sent. */
for (count = 0; count < bytesout; count++) {
cmd = read8((void *)(spibar + 0x0C));
}
/* read response bytes */
for (count = 0; count < bytesin; count++, din++) {
*(u8 *)din = read8((void *)(spibar + 0x0C));
}
return 0;
}
static const struct spi_ctrlr spi_ctrlr = {
.xfer = spi_ctrlr_xfer,
.xfer_vector = spi_xfer_two_vectors,
.max_xfer_size = AMD_SB_SPI_TX_LEN,
.deduct_cmd_len = true,
};
const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = {
{
.ctrlr = &spi_ctrlr,
.bus_start = 0,
.bus_end = 0,
},
};
const size_t spi_ctrlr_bus_map_count = ARRAY_SIZE(spi_ctrlr_bus_map);
|
