75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
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/*
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* DWMAC glue for NXP LPC18xx/LPC43xx Ethernet
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*
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* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/of.h>
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#include <linux/of_net.h>
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#include <linux/phy.h>
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#include <linux/regmap.h>
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#include <linux/stmmac.h>
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/* Register defines for CREG syscon */
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#define LPC18XX_CREG_CREG6 0x12c
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# define LPC18XX_CREG_CREG6_ETHMODE_MASK 0x7
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# define LPC18XX_CREG_CREG6_ETHMODE_MII 0x0
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# define LPC18XX_CREG_CREG6_ETHMODE_RMII 0x4
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struct lpc18xx_dwmac_priv_data {
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struct regmap *reg;
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int interface;
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};
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static void *lpc18xx_dwmac_setup(struct platform_device *pdev)
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{
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struct lpc18xx_dwmac_priv_data *dwmac;
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dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
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if (!dwmac)
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return ERR_PTR(-ENOMEM);
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dwmac->interface = of_get_phy_mode(pdev->dev.of_node);
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if (dwmac->interface < 0)
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return ERR_PTR(dwmac->interface);
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dwmac->reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
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if (IS_ERR(dwmac->reg)) {
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dev_err(&pdev->dev, "Syscon lookup failed\n");
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return dwmac->reg;
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}
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return dwmac;
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}
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static int lpc18xx_dwmac_init(struct platform_device *pdev, void *priv)
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{
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struct lpc18xx_dwmac_priv_data *dwmac = priv;
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u8 ethmode;
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if (dwmac->interface == PHY_INTERFACE_MODE_MII) {
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ethmode = LPC18XX_CREG_CREG6_ETHMODE_MII;
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} else if (dwmac->interface == PHY_INTERFACE_MODE_RMII) {
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ethmode = LPC18XX_CREG_CREG6_ETHMODE_RMII;
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} else {
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dev_err(&pdev->dev, "Only MII and RMII mode supported\n");
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return -EINVAL;
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}
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regmap_update_bits(dwmac->reg, LPC18XX_CREG_CREG6,
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LPC18XX_CREG_CREG6_ETHMODE_MASK, ethmode);
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return 0;
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}
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const struct stmmac_of_data lpc18xx_dwmac_data = {
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.has_gmac = 1,
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.setup = lpc18xx_dwmac_setup,
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.init = lpc18xx_dwmac_init,
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};
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