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/*
* GPIO based MDIO bitbang driver.
* Supports OpenFirmware.
*
* (C) Copyright 2015
* CogentEmbedded, Andrey Gusakov <andrey.gusakov@cogentembedded.com>
*
* based on mvmdio driver from Linux
* Copyright (c) 2008 CSE Semaphore Belgium.
* by Laurent Pinchart <laurentp@cse-semaphore.com>
*
* Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
*
* Based on earlier work by
*
* Copyright (c) 2003 Intracom S.A.
* by Pantelis Antoniou <panto@intracom.gr>
*
* 2005 (c) MontaVista Software, Inc.
* Vitaly Bordug <vbordug@ru.mvista.com>
*
* 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.
*/
#define DEBUG
#include <common.h>
#include <driver.h>
#include <init.h>
#include <io.h>
#include <of.h>
#include <of_gpio.h>
#include <linux/phy.h>
#include <gpio.h>
#include <malloc.h>
#include <xfuncs.h>
#include <linux/mdio-bitbang.h>
struct mdio_gpio_info {
struct mdiobb_ctrl ctrl;
int mdc, mdio, mdo;
int mdc_active_low, mdio_active_low, mdo_active_low;
};
struct mdio_gpio_info *mdio_gpio_of_get_info(struct device_d *dev)
{
int ret;
enum of_gpio_flags flags;
struct mdio_gpio_info *info;
info = xzalloc(sizeof(*info));
ret = of_get_gpio_flags(dev->device_node, 0, &flags);
if (ret < 0) {
dev_dbg(dev, "failed to get MDC inforamtion from DT\n");
goto free_info;
}
info->mdc = ret;
info->mdc_active_low = flags & OF_GPIO_ACTIVE_LOW;
ret = of_get_gpio_flags(dev->device_node, 1, &flags);
if (ret < 0) {
dev_dbg(dev, "failed to get MDIO inforamtion from DT\n");
goto free_info;
}
info->mdio = ret;
info->mdio_active_low = flags & OF_GPIO_ACTIVE_LOW;
ret = of_get_gpio_flags(dev->device_node, 2, &flags);
if (ret > 0) {
dev_dbg(dev, "found MDO information in DT\n");
info->mdo = ret;
info->mdo_active_low = flags & OF_GPIO_ACTIVE_LOW;
}
return info;
free_info:
free(info);
return ERR_PTR(ret);
}
static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
{
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
if (bitbang->mdo) {
/* Separate output pin. Always set its value to high
* when changing direction. If direction is input,
* assume the pin serves as pull-up. If direction is
* output, the default value is high.
*/
gpio_set_value(bitbang->mdo,
1 ^ bitbang->mdo_active_low);
return;
}
if (dir)
gpio_direction_output(bitbang->mdio,
1 ^ bitbang->mdio_active_low);
else
gpio_direction_input(bitbang->mdio);
}
static int mdio_get(struct mdiobb_ctrl *ctrl)
{
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
return gpio_get_value(bitbang->mdio) ^
bitbang->mdio_active_low;
}
static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
{
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
if (bitbang->mdo)
gpio_set_value(bitbang->mdo,
what ^ bitbang->mdo_active_low);
else
gpio_set_value(bitbang->mdio,
what ^ bitbang->mdio_active_low);
}
static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
{
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
gpio_set_value(bitbang->mdc, what ^ bitbang->mdc_active_low);
}
static struct mdiobb_ops mdio_gpio_ops = {
.set_mdc = mdc_set,
.set_mdio_dir = mdio_dir,
.set_mdio_data = mdio_set,
.get_mdio_data = mdio_get,
};
static int mdio_gpio_probe(struct device_d *dev)
{
int ret;
struct device_node *np = dev->device_node;
struct mdio_gpio_info *info;
struct mii_bus *bus;
info = mdio_gpio_of_get_info(dev);
if (IS_ERR(info))
return PTR_ERR(info);
info->ctrl.ops = &mdio_gpio_ops;
ret = gpio_request(info->mdc, "mdc");
if (ret < 0) {
dev_dbg(dev, "failed to request MDC\n");
goto free_info;
}
ret = gpio_request(info->mdio, "mdio");
if (ret < 0) {
dev_dbg(dev, "failed to request MDIO\n");
goto free_mdc;
}
if (info->mdo) {
ret = gpio_request(info->mdo, "mdo");
if (ret < 0) {
dev_dbg(dev, "failed to request MDO\n");
goto free_mdio;
}
ret = gpio_direction_output(info->mdo, 1);
if (ret < 0) {
dev_dbg(dev, "failed to set MDO as output\n");
goto free_mdo;
}
ret = gpio_direction_input(info->mdio);
if (ret < 0) {
dev_dbg(dev, "failed to set MDIO as input\n");
goto free_mdo;
}
}
ret = gpio_direction_output(info->mdc, 0);
if (ret < 0) {
dev_dbg(dev, "failed to set MDC as output\n");
goto free_mdo;
}
bus = alloc_mdio_bitbang(&info->ctrl);
bus->parent = dev;
bus->dev.device_node = np;
dev->priv = bus;
ret = mdiobus_register(bus);
if (!ret)
return 0;
free(bus);
free_mdo:
gpio_free(info->mdo);
free_mdc:
gpio_free(info->mdc);
free_mdio:
gpio_free(info->mdio);
free_info:
free(info);
return ret;
}
static const struct of_device_id gpio_mdio_dt_ids[] = {
{ .compatible = "virtual,mdio-gpio", },
{ /* sentinel */ }
};
static struct driver_d mdio_gpio_driver = {
.name = "mdio-gpio",
.probe = mdio_gpio_probe,
.of_compatible = DRV_OF_COMPAT(gpio_mdio_dt_ids),
};
device_platform_driver(mdio_gpio_driver);
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