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
|
/*
* This file is part of the coreboot project.
*
* 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 <assert.h>
#include <console/console.h>
#include <device/device.h>
#include <device/smbus.h>
#include "chip.h"
#define SMBUS_BLOCK_SIZE 32
static void ck505_init(struct device *dev)
{
struct drivers_i2c_ck505_config *config;
int dev_nregs, nregs;
u8 block[SMBUS_BLOCK_SIZE];
int i;
if (!dev->enabled || dev->path.type != DEVICE_PATH_I2C)
return;
config = dev->chip_info;
dev_nregs = smbus_block_read(dev, 0, sizeof(block), block);
if (dev_nregs < 0) {
printk(BIOS_ERR, "Failed reading ck505 configuration!\n");
return;
}
/* This means that the devicetree doesn't have to specify nregs */
nregs = MIN(MIN(dev_nregs, config->nregs == 0 ? SMBUS_BLOCK_SIZE
: config->nregs), ARRAY_SIZE(config->mask));
printk(BIOS_DEBUG, "Changing %d of the %d ck505 config bytes.\n",
nregs, dev_nregs);
assert(ARRAY_SIZE(config->mask) == ARRAY_SIZE(config->regs));
for (i = 0; i < nregs && i < SMBUS_BLOCK_SIZE; i++)
block[i] = (block[i] & ~config->mask[i]) | config->regs[i];
if (smbus_block_write(dev, 0, dev_nregs, block) < 0)
printk(BIOS_ERR, "Failed writing ck505 configuration!\n");
}
static struct device_operations ck505_operations = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.init = ck505_init,
};
static void enable_dev(struct device *dev)
{
dev->ops = &ck505_operations;
}
struct chip_operations drivers_i2c_ck505_ops = {
CHIP_NAME("CK505 Clock generator")
.enable_dev = enable_dev,
};
|
