stm32-reset.c
2.33 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
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <reset-uclass.h>
#include <stm32_rcc.h>
#include <asm/io.h>
/* reset clear offset for STM32MP RCC */
#define RCC_CL 0x4
struct stm32_reset_priv {
fdt_addr_t base;
};
static int stm32_reset_request(struct reset_ctl *reset_ctl)
{
return 0;
}
static int stm32_reset_free(struct reset_ctl *reset_ctl)
{
return 0;
}
static int stm32_reset_assert(struct reset_ctl *reset_ctl)
{
struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
int offset = reset_ctl->id % BITS_PER_LONG;
debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
reset_ctl->id, bank, offset);
if (dev_get_driver_data(reset_ctl->dev) == STM32MP1)
/* reset assert is done in rcc set register */
writel(BIT(offset), priv->base + bank);
else
setbits_le32(priv->base + bank, BIT(offset));
return 0;
}
static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
{
struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
int offset = reset_ctl->id % BITS_PER_LONG;
debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
reset_ctl->id, bank, offset);
if (dev_get_driver_data(reset_ctl->dev) == STM32MP1)
/* reset deassert is done in rcc clr register */
writel(BIT(offset), priv->base + bank + RCC_CL);
else
clrbits_le32(priv->base + bank, BIT(offset));
return 0;
}
static const struct reset_ops stm32_reset_ops = {
.request = stm32_reset_request,
.free = stm32_reset_free,
.rst_assert = stm32_reset_assert,
.rst_deassert = stm32_reset_deassert,
};
static int stm32_reset_probe(struct udevice *dev)
{
struct stm32_reset_priv *priv = dev_get_priv(dev);
priv->base = dev_read_addr(dev);
if (priv->base == FDT_ADDR_T_NONE) {
/* for MFD, get address of parent */
priv->base = dev_read_addr(dev->parent);
if (priv->base == FDT_ADDR_T_NONE)
return -EINVAL;
}
return 0;
}
U_BOOT_DRIVER(stm32_rcc_reset) = {
.name = "stm32_rcc_reset",
.id = UCLASS_RESET,
.probe = stm32_reset_probe,
.priv_auto_alloc_size = sizeof(struct stm32_reset_priv),
.ops = &stm32_reset_ops,
};