141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/**
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* dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
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*
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* Copyright (C) 2013 Chen-Yu Tsai
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*
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* Chen-Yu Tsai <wens@csie.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/stmmac.h>
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#include <linux/clk.h>
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#include <linux/phy.h>
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#include <linux/of_net.h>
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#include <linux/regulator/consumer.h>
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struct sunxi_priv_data {
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int interface;
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int clk_enabled;
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struct clk *tx_clk;
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struct regulator *regulator;
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};
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static void *sun7i_gmac_setup(struct platform_device *pdev)
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{
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struct sunxi_priv_data *gmac;
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struct device *dev = &pdev->dev;
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gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
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if (!gmac)
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return ERR_PTR(-ENOMEM);
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gmac->interface = of_get_phy_mode(dev->of_node);
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gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
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if (IS_ERR(gmac->tx_clk)) {
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dev_err(dev, "could not get tx clock\n");
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return gmac->tx_clk;
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}
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/* Optional regulator for PHY */
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gmac->regulator = devm_regulator_get_optional(dev, "phy");
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if (IS_ERR(gmac->regulator)) {
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if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER)
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return ERR_PTR(-EPROBE_DEFER);
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dev_info(dev, "no regulator found\n");
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gmac->regulator = NULL;
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}
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return gmac;
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}
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#define SUN7I_GMAC_GMII_RGMII_RATE 125000000
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#define SUN7I_GMAC_MII_RATE 25000000
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static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
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{
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struct sunxi_priv_data *gmac = priv;
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int ret;
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if (gmac->regulator) {
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ret = regulator_enable(gmac->regulator);
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if (ret)
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return ret;
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}
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/* Set GMAC interface port mode
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*
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* The GMAC TX clock lines are configured by setting the clock
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* rate, which then uses the auto-reparenting feature of the
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* clock driver, and enabling/disabling the clock.
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*/
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if (gmac->interface == PHY_INTERFACE_MODE_RGMII) {
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clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
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clk_prepare_enable(gmac->tx_clk);
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gmac->clk_enabled = 1;
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} else {
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clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
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clk_prepare(gmac->tx_clk);
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}
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return 0;
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}
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static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
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{
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struct sunxi_priv_data *gmac = priv;
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if (gmac->clk_enabled) {
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clk_disable(gmac->tx_clk);
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gmac->clk_enabled = 0;
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}
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clk_unprepare(gmac->tx_clk);
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if (gmac->regulator)
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regulator_disable(gmac->regulator);
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}
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static void sun7i_fix_speed(void *priv, unsigned int speed)
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{
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struct sunxi_priv_data *gmac = priv;
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/* only GMII mode requires us to reconfigure the clock lines */
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if (gmac->interface != PHY_INTERFACE_MODE_GMII)
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return;
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if (gmac->clk_enabled) {
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clk_disable(gmac->tx_clk);
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gmac->clk_enabled = 0;
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}
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clk_unprepare(gmac->tx_clk);
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if (speed == 1000) {
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clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
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clk_prepare_enable(gmac->tx_clk);
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gmac->clk_enabled = 1;
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} else {
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clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
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clk_prepare(gmac->tx_clk);
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}
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}
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/* of_data specifying hardware features and callbacks.
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* hardware features were copied from Allwinner drivers. */
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const struct stmmac_of_data sun7i_gmac_data = {
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.has_gmac = 1,
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.tx_coe = 1,
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.fix_mac_speed = sun7i_fix_speed,
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.setup = sun7i_gmac_setup,
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.init = sun7i_gmac_init,
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.exit = sun7i_gmac_exit,
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};
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