252 lines
6.2 KiB
C
252 lines
6.2 KiB
C
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/*
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* phy-da8xx-usb - TI DaVinci DA8xx USB PHY driver
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*
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* Copyright (C) 2016 David Lechner <david@lechnology.com>
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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; version 2 of the License.
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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/clk.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/mfd/da8xx-cfgchip.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define PHY_INIT_BITS (CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN)
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struct da8xx_usb_phy {
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struct phy_provider *phy_provider;
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struct phy *usb11_phy;
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struct phy *usb20_phy;
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struct clk *usb11_clk;
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struct clk *usb20_clk;
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struct regmap *regmap;
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};
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static int da8xx_usb11_phy_power_on(struct phy *phy)
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{
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struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
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int ret;
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ret = clk_prepare_enable(d_phy->usb11_clk);
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if (ret)
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return ret;
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regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM,
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CFGCHIP2_USB1SUSPENDM);
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return 0;
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}
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static int da8xx_usb11_phy_power_off(struct phy *phy)
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{
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struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
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regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0);
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clk_disable_unprepare(d_phy->usb11_clk);
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return 0;
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}
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static const struct phy_ops da8xx_usb11_phy_ops = {
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.power_on = da8xx_usb11_phy_power_on,
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.power_off = da8xx_usb11_phy_power_off,
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.owner = THIS_MODULE,
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};
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static int da8xx_usb20_phy_power_on(struct phy *phy)
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{
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struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
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int ret;
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ret = clk_prepare_enable(d_phy->usb20_clk);
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if (ret)
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return ret;
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regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 0);
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return 0;
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}
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static int da8xx_usb20_phy_power_off(struct phy *phy)
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{
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struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
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regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN,
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CFGCHIP2_OTGPWRDN);
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clk_disable_unprepare(d_phy->usb20_clk);
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return 0;
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}
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static int da8xx_usb20_phy_set_mode(struct phy *phy, enum phy_mode mode)
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{
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struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
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u32 val;
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switch (mode) {
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case PHY_MODE_USB_HOST: /* Force VBUS valid, ID = 0 */
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val = CFGCHIP2_OTGMODE_FORCE_HOST;
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break;
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case PHY_MODE_USB_DEVICE: /* Force VBUS valid, ID = 1 */
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val = CFGCHIP2_OTGMODE_FORCE_DEVICE;
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break;
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case PHY_MODE_USB_OTG: /* Don't override the VBUS/ID comparators */
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val = CFGCHIP2_OTGMODE_NO_OVERRIDE;
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break;
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default:
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return -EINVAL;
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}
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regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK,
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val);
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return 0;
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}
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static const struct phy_ops da8xx_usb20_phy_ops = {
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.power_on = da8xx_usb20_phy_power_on,
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.power_off = da8xx_usb20_phy_power_off,
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.set_mode = da8xx_usb20_phy_set_mode,
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.owner = THIS_MODULE,
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};
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static struct phy *da8xx_usb_phy_of_xlate(struct device *dev,
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struct of_phandle_args *args)
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{
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struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev);
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if (!d_phy)
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return ERR_PTR(-ENODEV);
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switch (args->args[0]) {
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case 0:
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return d_phy->usb20_phy;
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case 1:
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return d_phy->usb11_phy;
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default:
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return ERR_PTR(-EINVAL);
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}
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}
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static int da8xx_usb_phy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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struct da8xx_usb_phy *d_phy;
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d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL);
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if (!d_phy)
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return -ENOMEM;
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if (node)
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d_phy->regmap = syscon_regmap_lookup_by_compatible(
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"ti,da830-cfgchip");
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else
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d_phy->regmap = syscon_regmap_lookup_by_pdevname("syscon");
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if (IS_ERR(d_phy->regmap)) {
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dev_err(dev, "Failed to get syscon\n");
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return PTR_ERR(d_phy->regmap);
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}
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d_phy->usb11_clk = devm_clk_get(dev, "usb11_phy");
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if (IS_ERR(d_phy->usb11_clk)) {
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dev_err(dev, "Failed to get usb11_phy clock\n");
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return PTR_ERR(d_phy->usb11_clk);
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}
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d_phy->usb20_clk = devm_clk_get(dev, "usb20_phy");
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if (IS_ERR(d_phy->usb20_clk)) {
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dev_err(dev, "Failed to get usb20_phy clock\n");
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return PTR_ERR(d_phy->usb20_clk);
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}
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d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops);
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if (IS_ERR(d_phy->usb11_phy)) {
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dev_err(dev, "Failed to create usb11 phy\n");
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return PTR_ERR(d_phy->usb11_phy);
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}
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d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops);
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if (IS_ERR(d_phy->usb20_phy)) {
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dev_err(dev, "Failed to create usb20 phy\n");
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return PTR_ERR(d_phy->usb20_phy);
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}
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platform_set_drvdata(pdev, d_phy);
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phy_set_drvdata(d_phy->usb11_phy, d_phy);
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phy_set_drvdata(d_phy->usb20_phy, d_phy);
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if (node) {
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d_phy->phy_provider = devm_of_phy_provider_register(dev,
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da8xx_usb_phy_of_xlate);
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if (IS_ERR(d_phy->phy_provider)) {
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dev_err(dev, "Failed to create phy provider\n");
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return PTR_ERR(d_phy->phy_provider);
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}
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} else {
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int ret;
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ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy",
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"ohci-da8xx");
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if (ret)
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dev_warn(dev, "Failed to create usb11 phy lookup\n");
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ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy",
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"musb-da8xx");
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if (ret)
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dev_warn(dev, "Failed to create usb20 phy lookup\n");
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}
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regmap_write_bits(d_phy->regmap, CFGCHIP(2),
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PHY_INIT_BITS, PHY_INIT_BITS);
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return 0;
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}
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static int da8xx_usb_phy_remove(struct platform_device *pdev)
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{
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struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev);
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if (!pdev->dev.of_node) {
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phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx");
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phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci-da8xx");
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}
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return 0;
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}
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static const struct of_device_id da8xx_usb_phy_ids[] = {
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{ .compatible = "ti,da830-usb-phy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids);
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static struct platform_driver da8xx_usb_phy_driver = {
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.probe = da8xx_usb_phy_probe,
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.remove = da8xx_usb_phy_remove,
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.driver = {
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.name = "da8xx-usb-phy",
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.of_match_table = da8xx_usb_phy_ids,
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},
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};
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module_platform_driver(da8xx_usb_phy_driver);
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MODULE_ALIAS("platform:da8xx-usb-phy");
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MODULE_AUTHOR("David Lechner <david@lechnology.com>");
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MODULE_DESCRIPTION("TI DA8xx USB PHY driver");
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MODULE_LICENSE("GPL v2");
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