23e9b38d8e
If we configure the da8xx OTG phy in OTG mode, neither device or host mode will work. That is because the PHY is not able to detect and notify the driver that value of ID pin changed. To work despite this hardware limitation, the da8xx glue implement a workaround. But to work, the workaround require the VBUS sense and the session end comparator to enabled. Enable them if the phy is configured in OTG mode. Signed-off-by: Alexandre Bailon <abailon@baylibre.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
252 lines
6.2 KiB
C
252 lines
6.2 KiB
C
/*
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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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