In Tegra186, on-SoC reset signals are manipulated using IPC requests to the BPMP (Boot and Power Management Processor). This change implements a driver that does that. It is unconditionally selected by CONFIG_TEGRA186 since virtually any Tegra186 build of U-Boot will need the feature. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>master
parent
d9fd7008f4
commit
4dd99d140c
@ -0,0 +1,81 @@ |
||||
/*
|
||||
* Copyright (c) 2016, NVIDIA CORPORATION. |
||||
* |
||||
* SPDX-License-Identifier: GPL-2.0 |
||||
*/ |
||||
|
||||
#include <common.h> |
||||
#include <dm.h> |
||||
#include <misc.h> |
||||
#include <reset-uclass.h> |
||||
#include <asm/arch-tegra/bpmp_abi.h> |
||||
|
||||
static int tegra186_reset_request(struct reset_ctl *reset_ctl) |
||||
{ |
||||
debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, |
||||
reset_ctl->dev, reset_ctl->id); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int tegra186_reset_free(struct reset_ctl *reset_ctl) |
||||
{ |
||||
debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, |
||||
reset_ctl->dev, reset_ctl->id); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int tegra186_reset_common(struct reset_ctl *reset_ctl, |
||||
enum mrq_reset_commands cmd) |
||||
{ |
||||
struct mrq_reset_request req; |
||||
int ret; |
||||
|
||||
req.cmd = cmd; |
||||
req.reset_id = reset_ctl->id; |
||||
|
||||
ret = misc_call(reset_ctl->dev->parent, MRQ_RESET, &req, sizeof(req), |
||||
NULL, 0); |
||||
if (ret < 0) |
||||
return ret; |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int tegra186_reset_assert(struct reset_ctl *reset_ctl) |
||||
{ |
||||
debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, |
||||
reset_ctl->dev, reset_ctl->id); |
||||
|
||||
return tegra186_reset_common(reset_ctl, CMD_RESET_ASSERT); |
||||
} |
||||
|
||||
static int tegra186_reset_deassert(struct reset_ctl *reset_ctl) |
||||
{ |
||||
debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, |
||||
reset_ctl->dev, reset_ctl->id); |
||||
|
||||
return tegra186_reset_common(reset_ctl, CMD_RESET_DEASSERT); |
||||
} |
||||
|
||||
struct reset_ops tegra186_reset_ops = { |
||||
.request = tegra186_reset_request, |
||||
.free = tegra186_reset_free, |
||||
.rst_assert = tegra186_reset_assert, |
||||
.rst_deassert = tegra186_reset_deassert, |
||||
}; |
||||
|
||||
static int tegra186_reset_probe(struct udevice *dev) |
||||
{ |
||||
debug("%s(dev=%p)\n", __func__, dev); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
U_BOOT_DRIVER(tegra186_reset) = { |
||||
.name = "tegra186_reset", |
||||
.id = UCLASS_RESET, |
||||
.probe = tegra186_reset_probe, |
||||
.ops = &tegra186_reset_ops, |
||||
}; |
Loading…
Reference in new issue