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// SPDX-License-Identifier: GPL-2.0
/*
* dwmac-imx.c - DWMAC Specific Glue layer for NXP imx8
*
* Copyright 2020 NXP
*
*/
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/stmmac.h>
#include "stmmac_platform.h"
#define GPR_ENET_QOS_INTF_MODE_MASK GENMASK(21, 16)
#define GPR_ENET_QOS_INTF_SEL_MII (0x0 << 16)
#define GPR_ENET_QOS_INTF_SEL_RMII (0x4 << 16)
#define GPR_ENET_QOS_INTF_SEL_RGMII (0x1 << 16)
#define GPR_ENET_QOS_CLK_GEN_EN (0x1 << 19)
#define GPR_ENET_QOS_CLK_TX_CLK_SEL (0x1 << 20)
#define GPR_ENET_QOS_RGMII_EN (0x1 << 21)
struct imx_dwmac_ops {
u32 addr_width;
bool mac_rgmii_txclk_auto_adj;
int (*set_intf_mode)(struct plat_stmmacenet_data *plat_dat);
};
struct imx_priv_data {
struct device *dev;
struct clk *clk_tx;
struct clk *clk_mem;
struct regmap *intf_regmap;
u32 intf_reg_off;
bool rmii_refclk_ext;
const struct imx_dwmac_ops *ops;
struct plat_stmmacenet_data *plat_dat;
};
static int imx8mp_set_intf_mode(struct plat_stmmacenet_data *plat_dat)
{
struct imx_priv_data *dwmac = plat_dat->bsp_priv;
int val;
switch (plat_dat->interface) {
case PHY_INTERFACE_MODE_MII:
val = GPR_ENET_QOS_INTF_SEL_MII;
break;
case PHY_INTERFACE_MODE_RMII:
val = GPR_ENET_QOS_INTF_SEL_RMII;
val |= (dwmac->rmii_refclk_ext ? 0 : GPR_ENET_QOS_CLK_TX_CLK_SEL);
break;
case PHY_INTERFACE_MODE_RGMII:
case PHY_INTERFACE_MODE_RGMII_ID:
case PHY_INTERFACE_MODE_RGMII_RXID:
case PHY_INTERFACE_MODE_RGMII_TXID:
val = GPR_ENET_QOS_INTF_SEL_RGMII |
GPR_ENET_QOS_RGMII_EN;
break;
default:
pr_debug("imx dwmac doesn't support %d interface\n",
plat_dat->interface);
return -EINVAL;
}
val |= GPR_ENET_QOS_CLK_GEN_EN;
return regmap_update_bits(dwmac->intf_regmap, dwmac->intf_reg_off,
GPR_ENET_QOS_INTF_MODE_MASK, val);
};
static int
imx8dxl_set_intf_mode(struct plat_stmmacenet_data *plat_dat)
{
int ret = 0;
/* TBD: depends on imx8dxl scu interfaces to be upstreamed */
return ret;
}
static int imx_dwmac_init(struct platform_device *pdev, void *priv)
{
struct plat_stmmacenet_data *plat_dat;
struct imx_priv_data *dwmac = priv;
int ret;
plat_dat = dwmac->plat_dat;
ret = clk_prepare_enable(dwmac->clk_mem);
if (ret) {
dev_err(&pdev->dev, "mem clock enable failed\n");
return ret;
}
ret = clk_prepare_enable(dwmac->clk_tx);
if (ret) {
dev_err(&pdev->dev, "tx clock enable failed\n");
goto clk_tx_en_failed;
}
if (dwmac->ops->set_intf_mode) {
ret = dwmac->ops->set_intf_mode(plat_dat);
if (ret)
goto intf_mode_failed;
}
return 0;
intf_mode_failed:
clk_disable_unprepare(dwmac->clk_tx);
clk_tx_en_failed:
clk_disable_unprepare(dwmac->clk_mem);
return ret;
}
static void imx_dwmac_exit(struct platform_device *pdev, void *priv)
{
struct imx_priv_data *dwmac = priv;
if (dwmac->clk_tx)
clk_disable_unprepare(dwmac->clk_tx);
clk_disable_unprepare(dwmac->clk_mem);
}
static void imx_dwmac_fix_speed(void *priv, unsigned int speed)
{
struct plat_stmmacenet_data *plat_dat;
struct imx_priv_data *dwmac = priv;
unsigned long rate;
int err;
plat_dat = dwmac->plat_dat;
if (dwmac->ops->mac_rgmii_txclk_auto_adj ||
(plat_dat->interface == PHY_INTERFACE_MODE_RMII) ||
(plat_dat->interface == PHY_INTERFACE_MODE_MII))
return;
switch (speed) {
case SPEED_1000:
rate = 125000000;
break;
case SPEED_100:
rate = 25000000;
break;
case SPEED_10:
rate = 2500000;
break;
default:
dev_err(dwmac->dev, "invalid speed %u\n", speed);
return;
}
err = clk_set_rate(dwmac->clk_tx, rate);
if (err < 0)
dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
}
static int
imx_dwmac_parse_dt(struct imx_priv_data *dwmac, struct device *dev)
{
struct device_node *np = dev->of_node;
int err = 0;
if (of_get_property(np, "snps,rmii_refclk_ext", NULL))
dwmac->rmii_refclk_ext = true;
dwmac->clk_tx = devm_clk_get(dev, "tx");
if (IS_ERR(dwmac->clk_tx)) {
dev_err(dev, "failed to get tx clock\n");
return PTR_ERR(dwmac->clk_tx);
}
dwmac->clk_mem = NULL;
if (of_machine_is_compatible("fsl,imx8dxl")) {
dwmac->clk_mem = devm_clk_get(dev, "mem");
if (IS_ERR(dwmac->clk_mem)) {
dev_err(dev, "failed to get mem clock\n");
return PTR_ERR(dwmac->clk_mem);
}
}
if (of_machine_is_compatible("fsl,imx8mp")) {
/* Binding doc describes the propety:
is required by i.MX8MP.
is optinoal for i.MX8DXL.
*/
dwmac->intf_regmap = syscon_regmap_lookup_by_phandle(np, "intf_mode");
if (IS_ERR(dwmac->intf_regmap))
return PTR_ERR(dwmac->intf_regmap);
err = of_property_read_u32_index(np, "intf_mode", 1, &dwmac->intf_reg_off);
if (err) {
dev_err(dev, "Can't get intf mode reg offset (%d)\n", err);
return err;
}
}
return err;
}
static int imx_dwmac_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
struct imx_priv_data *dwmac;
const struct imx_dwmac_ops *data;
int ret;
ret = stmmac_get_platform_resources(pdev, &stmmac_res);
if (ret)
return ret;
dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
if (!dwmac)
return -ENOMEM;
plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
if (IS_ERR(plat_dat))
return PTR_ERR(plat_dat);
data = of_device_get_match_data(&pdev->dev);
if (!data) {
dev_err(&pdev->dev, "failed to get match data\n");
ret = -EINVAL;
goto err_match_data;
}
dwmac->ops = data;
dwmac->dev = &pdev->dev;
ret = imx_dwmac_parse_dt(dwmac, &pdev->dev);
if (ret) {
dev_err(&pdev->dev, "failed to parse OF data\n");
goto err_parse_dt;
}
ret = dma_set_mask_and_coherent(&pdev->dev,
DMA_BIT_MASK(dwmac->ops->addr_width));
if (ret) {
dev_err(&pdev->dev, "DMA mask set failed\n");
goto err_dma_mask;
}
plat_dat->init = imx_dwmac_init;
plat_dat->exit = imx_dwmac_exit;
plat_dat->fix_mac_speed = imx_dwmac_fix_speed;
plat_dat->bsp_priv = dwmac;
dwmac->plat_dat = plat_dat;
ret = imx_dwmac_init(pdev, dwmac);
if (ret)
goto err_dwmac_init;
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret)
goto err_drv_probe;
return 0;
err_dwmac_init:
err_drv_probe:
imx_dwmac_exit(pdev, plat_dat->bsp_priv);
err_dma_mask:
err_parse_dt:
err_match_data:
stmmac_remove_config_dt(pdev, plat_dat);
return ret;
}
static struct imx_dwmac_ops imx8mp_dwmac_data = {
.addr_width = 34,
.mac_rgmii_txclk_auto_adj = false,
.set_intf_mode = imx8mp_set_intf_mode,
};
static struct imx_dwmac_ops imx8dxl_dwmac_data = {
.addr_width = 32,
.mac_rgmii_txclk_auto_adj = true,
.set_intf_mode = imx8dxl_set_intf_mode,
};
static const struct of_device_id imx_dwmac_match[] = {
{ .compatible = "nxp,imx8mp-dwmac-eqos", .data = &imx8mp_dwmac_data },
{ .compatible = "nxp,imx8dxl-dwmac-eqos", .data = &imx8dxl_dwmac_data },
{ }
};
MODULE_DEVICE_TABLE(of, imx_dwmac_match);
static struct platform_driver imx_dwmac_driver = {
.probe = imx_dwmac_probe,
.remove = stmmac_pltfr_remove,
.driver = {
.name = "imx-dwmac",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = imx_dwmac_match,
},
};
module_platform_driver(imx_dwmac_driver);
MODULE_AUTHOR("NXP");
MODULE_DESCRIPTION("NXP imx8 DWMAC Specific Glue layer");
MODULE_LICENSE("GPL v2");