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
|
/*
* GRUB -- GRand Unified Bootloader
*
* Copyright (C) 2012 Google Inc.
* Copyright (C) 2016 Free Software Foundation, Inc.
*
* This is based on depthcharge code.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/mm.h>
#include <grub/time.h>
#include <grub/misc.h>
#include <grub/fdtbus.h>
#include <grub/machine/kernel.h>
static grub_err_t
spi_send (const struct grub_fdtbus_dev *dev, const void *data, grub_size_t sz)
{
const grub_uint8_t *ptr = data, *end = ptr + sz;
volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
spi[2] = 0;
spi[1] = sz - 1;
spi[0] = ((1 << 18) | spi[0]) & ~(1 << 19);
spi[2] = 1;
while (ptr < end)
{
while (spi[9] & 2);
spi[256] = *ptr++;
}
while (spi[9] & 1);
return GRUB_ERR_NONE;
}
static grub_err_t
spi_receive (const struct grub_fdtbus_dev *dev, void *data, grub_size_t sz)
{
grub_uint8_t *ptr = data, *end = ptr + sz;
volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
spi[2] = 0;
spi[1] = sz - 1;
spi[0] = ((1 << 19) | spi[0]) & ~(1 << 18);
spi[2] = 1;
while (ptr < end)
{
while (spi[9] & 8);
*ptr++ = spi[512];
}
while (spi[9] & 1);
return GRUB_ERR_NONE;
}
static grub_err_t
spi_start (const struct grub_fdtbus_dev *dev)
{
volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
spi[3] = 1;
return GRUB_ERR_NONE;
}
static void
spi_stop (const struct grub_fdtbus_dev *dev)
{
volatile grub_uint32_t *spi = grub_fdtbus_map_reg (dev, 0, 0);
spi[3] = 0;
}
static grub_err_t
spi_attach(const struct grub_fdtbus_dev *dev)
{
if (!grub_fdtbus_is_mapping_valid (grub_fdtbus_map_reg (dev, 0, 0)))
return GRUB_ERR_IO;
return GRUB_ERR_NONE;
}
static struct grub_fdtbus_driver spi =
{
.compatible = "rockchip,rk3288-spi",
.attach = spi_attach,
.send = spi_send,
.receive = spi_receive,
.start = spi_start,
.stop = spi_stop,
};
void
grub_rk3288_spi_init (void)
{
grub_fdtbus_register (&spi);
}
|
