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/*
* Oxford Semiconductor OXNAS DWMAC glue layer
*
* Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
* Copyright (C) 2014 Daniel Golle <daniel@makrotopia.org>
* Copyright (C) 2013 Ma Haijun <mahaijuns@gmail.com>
* Copyright (C) 2012 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/stmmac.h>
#include "stmmac_platform.h"
/* System Control regmap offsets */
#define OXNAS_DWMAC_CTRL_REGOFFSET 0x78
#define OXNAS_DWMAC_DELAY_REGOFFSET 0x100
/* Control Register */
#define DWMAC_CKEN_RX_IN 14
#define DWMAC_CKEN_RXN_OUT 13
#define DWMAC_CKEN_RX_OUT 12
#define DWMAC_CKEN_TX_IN 10
#define DWMAC_CKEN_TXN_OUT 9
#define DWMAC_CKEN_TX_OUT 8
#define DWMAC_RX_SOURCE 7
#define DWMAC_TX_SOURCE 6
#define DWMAC_LOW_TX_SOURCE 4
#define DWMAC_AUTO_TX_SOURCE 3
#define DWMAC_RGMII 2
#define DWMAC_SIMPLE_MUX 1
#define DWMAC_CKEN_GTX 0
/* Delay register */
#define DWMAC_TX_VARDELAY_SHIFT 0
#define DWMAC_TXN_VARDELAY_SHIFT 8
#define DWMAC_RX_VARDELAY_SHIFT 16
#define DWMAC_RXN_VARDELAY_SHIFT 24
#define DWMAC_TX_VARDELAY(d) ((d) << DWMAC_TX_VARDELAY_SHIFT)
#define DWMAC_TXN_VARDELAY(d) ((d) << DWMAC_TXN_VARDELAY_SHIFT)
#define DWMAC_RX_VARDELAY(d) ((d) << DWMAC_RX_VARDELAY_SHIFT)
#define DWMAC_RXN_VARDELAY(d) ((d) << DWMAC_RXN_VARDELAY_SHIFT)
struct oxnas_dwmac {
struct device *dev;
struct clk *clk;
struct regmap *regmap;
};
static int oxnas_dwmac_init(struct platform_device *pdev, void *priv)
{
struct oxnas_dwmac *dwmac = priv;
unsigned int value;
int ret;
/* Reset HW here before changing the glue configuration */
ret = device_reset(dwmac->dev);
if (ret)
return ret;
ret = clk_prepare_enable(dwmac->clk);
if (ret)
return ret;
ret = regmap_read(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, &value);
if (ret < 0) {
clk_disable_unprepare(dwmac->clk);
return ret;
}
/* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
value |= BIT(DWMAC_CKEN_GTX) |
/* Use simple mux for 25/125 Mhz clock switching */
BIT(DWMAC_SIMPLE_MUX) |
/* set auto switch tx clock source */
BIT(DWMAC_AUTO_TX_SOURCE) |
/* enable tx & rx vardelay */
BIT(DWMAC_CKEN_TX_OUT) |
BIT(DWMAC_CKEN_TXN_OUT) |
BIT(DWMAC_CKEN_TX_IN) |
BIT(DWMAC_CKEN_RX_OUT) |
BIT(DWMAC_CKEN_RXN_OUT) |
BIT(DWMAC_CKEN_RX_IN);
regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
/* set tx & rx vardelay */
value = DWMAC_TX_VARDELAY(4) |
DWMAC_TXN_VARDELAY(2) |
DWMAC_RX_VARDELAY(10) |
DWMAC_RXN_VARDELAY(8);
regmap_write(dwmac->regmap, OXNAS_DWMAC_DELAY_REGOFFSET, value);
return 0;
}
static void oxnas_dwmac_exit(struct platform_device *pdev, void *priv)
{
struct oxnas_dwmac *dwmac = priv;
clk_disable_unprepare(dwmac->clk);
}
static int oxnas_dwmac_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
struct oxnas_dwmac *dwmac;
int ret;
ret = stmmac_get_platform_resources(pdev, &stmmac_res);
if (ret)
return ret;
plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
if (IS_ERR(plat_dat))
return PTR_ERR(plat_dat);
dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
if (!dwmac) {
ret = -ENOMEM;
goto err_remove_config_dt;
}
dwmac->dev = &pdev->dev;
plat_dat->bsp_priv = dwmac;
plat_dat->init = oxnas_dwmac_init;
plat_dat->exit = oxnas_dwmac_exit;
dwmac->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
"oxsemi,sys-ctrl");
if (IS_ERR(dwmac->regmap)) {
dev_err(&pdev->dev, "failed to have sysctrl regmap\n");
ret = PTR_ERR(dwmac->regmap);
goto err_remove_config_dt;
}
dwmac->clk = devm_clk_get(&pdev->dev, "gmac");
if (IS_ERR(dwmac->clk)) {
ret = PTR_ERR(dwmac->clk);
goto err_remove_config_dt;
}
ret = oxnas_dwmac_init(pdev, plat_dat->bsp_priv);
if (ret)
goto err_remove_config_dt;
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret)
goto err_dwmac_exit;
return 0;
err_dwmac_exit:
oxnas_dwmac_exit(pdev, plat_dat->bsp_priv);
err_remove_config_dt:
stmmac_remove_config_dt(pdev, plat_dat);
return ret;
}
static const struct of_device_id oxnas_dwmac_match[] = {
{ .compatible = "oxsemi,ox820-dwmac" },
{ }
};
MODULE_DEVICE_TABLE(of, oxnas_dwmac_match);
static struct platform_driver oxnas_dwmac_driver = {
.probe = oxnas_dwmac_probe,
.remove = stmmac_pltfr_remove,
.driver = {
.name = "oxnas-dwmac",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = oxnas_dwmac_match,
},
};
module_platform_driver(oxnas_dwmac_driver);
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
MODULE_DESCRIPTION("Oxford Semiconductor OXNAS DWMAC glue layer");
MODULE_LICENSE("GPL v2");
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