mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 09:16:42 +07:00
376349232a
ARC AXS10x boards support custom IP-block which allows to control reset signals of selected peripherals. For example DW GMAC, etc... This block is controlled via memory-mapped register (AKA CREG) which represents up-to 32 reset lines. This regiter is self-clearing so we don't need to deassert line after reset. As of today only the following lines are used: - DW GMAC - line 5 Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/*
|
|
* Copyright (C) 2017 Synopsys.
|
|
*
|
|
* Synopsys AXS10x reset driver.
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reset-controller.h>
|
|
|
|
#define to_axs10x_rst(p) container_of((p), struct axs10x_rst, rcdev)
|
|
|
|
#define AXS10X_MAX_RESETS 32
|
|
|
|
struct axs10x_rst {
|
|
void __iomem *regs_rst;
|
|
spinlock_t lock;
|
|
struct reset_controller_dev rcdev;
|
|
};
|
|
|
|
static int axs10x_reset_reset(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct axs10x_rst *rst = to_axs10x_rst(rcdev);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&rst->lock, flags);
|
|
writel(BIT(id), rst->regs_rst);
|
|
spin_unlock_irqrestore(&rst->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct reset_control_ops axs10x_reset_ops = {
|
|
.reset = axs10x_reset_reset,
|
|
};
|
|
|
|
static int axs10x_reset_probe(struct platform_device *pdev)
|
|
{
|
|
struct axs10x_rst *rst;
|
|
struct resource *mem;
|
|
|
|
rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL);
|
|
if (!rst)
|
|
return -ENOMEM;
|
|
|
|
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem);
|
|
if (IS_ERR(rst->regs_rst))
|
|
return PTR_ERR(rst->regs_rst);
|
|
|
|
spin_lock_init(&rst->lock);
|
|
|
|
rst->rcdev.owner = THIS_MODULE;
|
|
rst->rcdev.ops = &axs10x_reset_ops;
|
|
rst->rcdev.of_node = pdev->dev.of_node;
|
|
rst->rcdev.nr_resets = AXS10X_MAX_RESETS;
|
|
|
|
return devm_reset_controller_register(&pdev->dev, &rst->rcdev);
|
|
}
|
|
|
|
static const struct of_device_id axs10x_reset_dt_match[] = {
|
|
{ .compatible = "snps,axs10x-reset" },
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver axs10x_reset_driver = {
|
|
.probe = axs10x_reset_probe,
|
|
.driver = {
|
|
.name = "axs10x-reset",
|
|
.of_match_table = axs10x_reset_dt_match,
|
|
},
|
|
};
|
|
builtin_platform_driver(axs10x_reset_driver);
|
|
|
|
MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
|
|
MODULE_DESCRIPTION("Synopsys AXS10x reset driver");
|
|
MODULE_LICENSE("GPL v2");
|