tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'tegra-for-4.10-reset' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/drivers
reset: Add Tegra BPMP reset driver
This contains a patch which implements a reset driver using the services
provided by the BPMP firmware (via the MRQ_RESET request).
* tag 'tegra-for-4.10-reset' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
reset: Add Tegra BPMP reset driver
Signed-off-by: Olof Johansson <olof@lixom.net>
+76
+1
drivers/reset/Kconfig
+1
drivers/reset/Kconfig
+1
drivers/reset/Makefile
+1
drivers/reset/Makefile
+1
drivers/reset/tegra/Makefile
+1
drivers/reset/tegra/Makefile
···
1
+
obj-$(CONFIG_RESET_TEGRA_BPMP) += reset-bpmp.o
+71
drivers/reset/tegra/reset-bpmp.c
+71
drivers/reset/tegra/reset-bpmp.c
···
1
+
/*
2
+
* Copyright (C) 2016 NVIDIA Corporation
3
+
*
4
+
* This program is free software; you can redistribute it and/or modify
5
+
* it under the terms of the GNU General Public License version 2 as
6
+
* published by the Free Software Foundation.
7
+
*/
8
+
9
+
#include <linux/reset-controller.h>
10
+
11
+
#include <soc/tegra/bpmp.h>
12
+
#include <soc/tegra/bpmp-abi.h>
13
+
14
+
static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
15
+
{
16
+
return container_of(rstc, struct tegra_bpmp, rstc);
17
+
}
18
+
19
+
static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
20
+
enum mrq_reset_commands command,
21
+
unsigned int id)
22
+
{
23
+
struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
24
+
struct mrq_reset_request request;
25
+
struct tegra_bpmp_message msg;
26
+
27
+
memset(&request, 0, sizeof(request));
28
+
request.cmd = command;
29
+
request.reset_id = id;
30
+
31
+
memset(&msg, 0, sizeof(msg));
32
+
msg.mrq = MRQ_RESET;
33
+
msg.tx.data = &request;
34
+
msg.tx.size = sizeof(request);
35
+
36
+
return tegra_bpmp_transfer(bpmp, &msg);
37
+
}
38
+
39
+
static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
40
+
unsigned long id)
41
+
{
42
+
return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
43
+
}
44
+
45
+
static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
46
+
unsigned long id)
47
+
{
48
+
return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
49
+
}
50
+
51
+
static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
52
+
unsigned long id)
53
+
{
54
+
return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
55
+
}
56
+
57
+
static const struct reset_control_ops tegra_bpmp_reset_ops = {
58
+
.reset = tegra_bpmp_reset_module,
59
+
.assert = tegra_bpmp_reset_assert,
60
+
.deassert = tegra_bpmp_reset_deassert,
61
+
};
62
+
63
+
int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
64
+
{
65
+
bpmp->rstc.ops = &tegra_bpmp_reset_ops;
66
+
bpmp->rstc.owner = THIS_MODULE;
67
+
bpmp->rstc.of_node = bpmp->dev->of_node;
68
+
bpmp->rstc.nr_resets = bpmp->soc->num_resets;
69
+
70
+
return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
71
+
}