150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Adaptrum Anarion DWMAC glue layer
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*
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* Copyright (C) 2017, Adaptrum, Inc.
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* (Written by Alexandru Gagniuc <alex.g at adaptrum.com> for Adaptrum, Inc.)
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_net.h>
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#include <linux/stmmac.h>
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#include "stmmac.h"
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#include "stmmac_platform.h"
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#define GMAC_RESET_CONTROL_REG 0
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#define GMAC_SW_CONFIG_REG 4
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#define GMAC_CONFIG_INTF_SEL_MASK (0x7 << 0)
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#define GMAC_CONFIG_INTF_RGMII (0x1 << 0)
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struct anarion_gmac {
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void __iomem *ctl_block;
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uint32_t phy_intf_sel;
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};
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static uint32_t gmac_read_reg(struct anarion_gmac *gmac, uint8_t reg)
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{
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return readl(gmac->ctl_block + reg);
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};
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static void gmac_write_reg(struct anarion_gmac *gmac, uint8_t reg, uint32_t val)
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{
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writel(val, gmac->ctl_block + reg);
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}
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static int anarion_gmac_init(struct platform_device *pdev, void *priv)
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{
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uint32_t sw_config;
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struct anarion_gmac *gmac = priv;
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/* Reset logic, configure interface mode, then release reset. SIMPLE! */
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gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
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sw_config = gmac_read_reg(gmac, GMAC_SW_CONFIG_REG);
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sw_config &= ~GMAC_CONFIG_INTF_SEL_MASK;
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sw_config |= (gmac->phy_intf_sel & GMAC_CONFIG_INTF_SEL_MASK);
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gmac_write_reg(gmac, GMAC_SW_CONFIG_REG, sw_config);
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gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 0);
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return 0;
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}
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static void anarion_gmac_exit(struct platform_device *pdev, void *priv)
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{
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struct anarion_gmac *gmac = priv;
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gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
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}
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static struct anarion_gmac *anarion_config_dt(struct platform_device *pdev)
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{
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struct anarion_gmac *gmac;
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phy_interface_t phy_mode;
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void __iomem *ctl_block;
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int err;
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ctl_block = devm_platform_ioremap_resource(pdev, 1);
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if (IS_ERR(ctl_block)) {
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err = PTR_ERR(ctl_block);
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dev_err(&pdev->dev, "Cannot get reset region (%d)!\n", err);
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return ERR_PTR(err);
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}
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gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL);
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if (!gmac)
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return ERR_PTR(-ENOMEM);
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gmac->ctl_block = ctl_block;
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err = of_get_phy_mode(pdev->dev.of_node, &phy_mode);
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if (err)
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return ERR_PTR(err);
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switch (phy_mode) {
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case PHY_INTERFACE_MODE_RGMII:
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fallthrough;
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case PHY_INTERFACE_MODE_RGMII_ID:
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case PHY_INTERFACE_MODE_RGMII_RXID:
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case PHY_INTERFACE_MODE_RGMII_TXID:
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gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII;
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break;
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default:
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dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n",
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phy_mode);
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return ERR_PTR(-ENOTSUPP);
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}
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return gmac;
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}
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static int anarion_dwmac_probe(struct platform_device *pdev)
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{
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int ret;
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struct anarion_gmac *gmac;
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struct plat_stmmacenet_data *plat_dat;
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struct stmmac_resources stmmac_res;
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ret = stmmac_get_platform_resources(pdev, &stmmac_res);
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if (ret)
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return ret;
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gmac = anarion_config_dt(pdev);
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if (IS_ERR(gmac))
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return PTR_ERR(gmac);
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plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
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if (IS_ERR(plat_dat))
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return PTR_ERR(plat_dat);
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plat_dat->init = anarion_gmac_init;
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plat_dat->exit = anarion_gmac_exit;
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anarion_gmac_init(pdev, gmac);
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plat_dat->bsp_priv = gmac;
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return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
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}
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static const struct of_device_id anarion_dwmac_match[] = {
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{ .compatible = "adaptrum,anarion-gmac" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, anarion_dwmac_match);
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static struct platform_driver anarion_dwmac_driver = {
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.probe = anarion_dwmac_probe,
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.remove_new = stmmac_pltfr_remove,
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.driver = {
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.name = "anarion-dwmac",
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.pm = &stmmac_pltfr_pm_ops,
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.of_match_table = anarion_dwmac_match,
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},
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};
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module_platform_driver(anarion_dwmac_driver);
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MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer");
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MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>");
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MODULE_LICENSE("GPL v2");
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