cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mdio-mux-gpio.c (2166B)


      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2011, 2012 Cavium, Inc.
      4 */
      5
      6#include <linux/device.h>
      7#include <linux/gpio/consumer.h>
      8#include <linux/mdio-mux.h>
      9#include <linux/module.h>
     10#include <linux/of_mdio.h>
     11#include <linux/phy.h>
     12#include <linux/platform_device.h>
     13
     14#define DRV_VERSION "1.1"
     15#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
     16
     17struct mdio_mux_gpio_state {
     18	struct gpio_descs *gpios;
     19	void *mux_handle;
     20};
     21
     22static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
     23				   void *data)
     24{
     25	struct mdio_mux_gpio_state *s = data;
     26	DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child));
     27
     28	if (current_child == desired_child)
     29		return 0;
     30
     31	values[0] = desired_child;
     32
     33	gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
     34				       s->gpios->info, values);
     35
     36	return 0;
     37}
     38
     39static int mdio_mux_gpio_probe(struct platform_device *pdev)
     40{
     41	struct mdio_mux_gpio_state *s;
     42	struct gpio_descs *gpios;
     43	int r;
     44
     45	gpios = devm_gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
     46	if (IS_ERR(gpios))
     47		return PTR_ERR(gpios);
     48
     49	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
     50	if (!s)
     51		return -ENOMEM;
     52
     53	s->gpios = gpios;
     54
     55	r = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
     56			  mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
     57
     58	if (r != 0)
     59		return r;
     60
     61	pdev->dev.platform_data = s;
     62	return 0;
     63}
     64
     65static int mdio_mux_gpio_remove(struct platform_device *pdev)
     66{
     67	struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
     68	mdio_mux_uninit(s->mux_handle);
     69	return 0;
     70}
     71
     72static const struct of_device_id mdio_mux_gpio_match[] = {
     73	{
     74		.compatible = "mdio-mux-gpio",
     75	},
     76	{
     77		/* Legacy compatible property. */
     78		.compatible = "cavium,mdio-mux-sn74cbtlv3253",
     79	},
     80	{},
     81};
     82MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
     83
     84static struct platform_driver mdio_mux_gpio_driver = {
     85	.driver = {
     86		.name		= "mdio-mux-gpio",
     87		.of_match_table = mdio_mux_gpio_match,
     88	},
     89	.probe		= mdio_mux_gpio_probe,
     90	.remove		= mdio_mux_gpio_remove,
     91};
     92
     93module_platform_driver(mdio_mux_gpio_driver);
     94
     95MODULE_DESCRIPTION(DRV_DESCRIPTION);
     96MODULE_VERSION(DRV_VERSION);
     97MODULE_AUTHOR("David Daney");
     98MODULE_LICENSE("GPL v2");