phy: da8xx-usb: new driver for DA8xx SoC USB PHY

This is a new phy driver for the SoC USB controllers on the TI DA8xx
family of microcontrollers. The USB 1.1 PHY is just a simple on/off.
The USB 2.0 PHY also allows overriding the VBUS and ID pins.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index b869b98835f4f5c4e4f3df5dfc998427af13a452..02afc624dd187df5f8ccf7fb29a56bfb02ac3c8b 100644 (file)
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -44,6 +44,16 @@ config ARMADA375_USBCLUSTER_PHY
        depends on OF && HAS_IOMEM
        select GENERIC_PHY
 
+config PHY_DA8XX_USB
+       tristate "TI DA8xx USB PHY Driver"
+       depends on ARCH_DAVINCI_DA8XX
+       select GENERIC_PHY
+       select MFD_SYSCON
+       help
+         Enable this to support the USB PHY on DA8xx SoCs.
+
+         This driver controls both the USB 1.1 PHY and the USB 2.0 PHY.
+
 config PHY_DM816X_USB
        tristate "TI dm816x USB PHY driver"
        depends on ARCH_OMAP2PLUS

diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 9c3e73ccabc4193c92f02e3b077959b987d76a70..fa8480e89724d50ab94ae747f574fe78c924c4b1 100644 (file)
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_GENERIC_PHY)               += phy-core.o
 obj-$(CONFIG_PHY_BCM_NS_USB2)          += phy-bcm-ns-usb2.o
 obj-$(CONFIG_PHY_BERLIN_USB)           += phy-berlin-usb.o
 obj-$(CONFIG_PHY_BERLIN_SATA)          += phy-berlin-sata.o
+obj-$(CONFIG_PHY_DA8XX_USB)            += phy-da8xx-usb.o
 obj-$(CONFIG_PHY_DM816X_USB)           += phy-dm816x-usb.o
 obj-$(CONFIG_ARMADA375_USBCLUSTER_PHY) += phy-armada375-usb2.o
 obj-$(CONFIG_BCM_KONA_USB2_PHY)                += phy-bcm-kona-usb2.o

diff --git a/drivers/phy/phy-da8xx-usb.c b/drivers/phy/phy-da8xx-usb.c
new file mode 100644 (file)
index 0000000..b2e59b6
--- /dev/null
+++ b/drivers/phy/phy-da8xx-usb.c
@@ -0,0 +1,245 @@
+/*
+ * phy-da8xx-usb - TI DaVinci DA8xx USB PHY driver
+ *
+ * Copyright (C) 2016 David Lechner <david@lechnology.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/mfd/da8xx-cfgchip.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+struct da8xx_usb_phy {
+       struct phy_provider     *phy_provider;
+       struct phy              *usb11_phy;
+       struct phy              *usb20_phy;
+       struct clk              *usb11_clk;
+       struct clk              *usb20_clk;
+       struct regmap           *regmap;
+};
+
+static int da8xx_usb11_phy_power_on(struct phy *phy)
+{
+       struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
+       int ret;
+
+       ret = clk_prepare_enable(d_phy->usb11_clk);
+       if (ret)
+               return ret;
+
+       regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM,
+                         CFGCHIP2_USB1SUSPENDM);
+
+       return 0;
+}
+
+static int da8xx_usb11_phy_power_off(struct phy *phy)
+{
+       struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
+
+       regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0);
+
+       clk_disable_unprepare(d_phy->usb11_clk);
+
+       return 0;
+}
+
+static const struct phy_ops da8xx_usb11_phy_ops = {
+       .power_on       = da8xx_usb11_phy_power_on,
+       .power_off      = da8xx_usb11_phy_power_off,
+       .owner          = THIS_MODULE,
+};
+
+static int da8xx_usb20_phy_power_on(struct phy *phy)
+{
+       struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
+       int ret;
+
+       ret = clk_prepare_enable(d_phy->usb20_clk);
+       if (ret)
+               return ret;
+
+       regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 0);
+
+       return 0;
+}
+
+static int da8xx_usb20_phy_power_off(struct phy *phy)
+{
+       struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
+
+       regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN,
+                         CFGCHIP2_OTGPWRDN);
+
+       clk_disable_unprepare(d_phy->usb20_clk);
+
+       return 0;
+}
+
+static int da8xx_usb20_phy_set_mode(struct phy *phy, enum phy_mode mode)
+{
+       struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
+       u32 val;
+
+       switch (mode) {
+       case PHY_MODE_USB_HOST:         /* Force VBUS valid, ID = 0 */
+               val = CFGCHIP2_OTGMODE_FORCE_HOST;
+               break;
+       case PHY_MODE_USB_DEVICE:       /* Force VBUS valid, ID = 1 */
+               val = CFGCHIP2_OTGMODE_FORCE_DEVICE;
+               break;
+       case PHY_MODE_USB_OTG:  /* Don't override the VBUS/ID comparators */
+               val = CFGCHIP2_OTGMODE_NO_OVERRIDE;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK,
+                         val);
+
+       return 0;
+}
+
+static const struct phy_ops da8xx_usb20_phy_ops = {
+       .power_on       = da8xx_usb20_phy_power_on,
+       .power_off      = da8xx_usb20_phy_power_off,
+       .set_mode       = da8xx_usb20_phy_set_mode,
+       .owner          = THIS_MODULE,
+};
+
+static struct phy *da8xx_usb_phy_of_xlate(struct device *dev,
+                                        struct of_phandle_args *args)
+{
+       struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev);
+
+       if (!d_phy)
+               return ERR_PTR(-ENODEV);
+
+       switch (args->args[0]) {
+       case 0:
+               return d_phy->usb20_phy;
+       case 1:
+               return d_phy->usb11_phy;
+       default:
+               return ERR_PTR(-EINVAL);
+       }
+}
+
+static int da8xx_usb_phy_probe(struct platform_device *pdev)
+{
+       struct device           *dev = &pdev->dev;
+       struct device_node      *node = dev->of_node;
+       struct da8xx_usb_phy    *d_phy;
+
+       d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL);
+       if (!d_phy)
+               return -ENOMEM;
+
+       if (node)
+               d_phy->regmap = syscon_regmap_lookup_by_compatible(
+                                                       "ti,da830-cfgchip");
+       else
+               d_phy->regmap = syscon_regmap_lookup_by_pdevname("syscon.0");
+       if (IS_ERR(d_phy->regmap)) {
+               dev_err(dev, "Failed to get syscon\n");
+               return PTR_ERR(d_phy->regmap);
+       }
+
+       d_phy->usb11_clk = devm_clk_get(dev, "usb11_phy");
+       if (IS_ERR(d_phy->usb11_clk)) {
+               dev_err(dev, "Failed to get usb11_phy clock\n");
+               return PTR_ERR(d_phy->usb11_clk);
+       }
+
+       d_phy->usb20_clk = devm_clk_get(dev, "usb20_phy");
+       if (IS_ERR(d_phy->usb20_clk)) {
+               dev_err(dev, "Failed to get usb20_phy clock\n");
+               return PTR_ERR(d_phy->usb20_clk);
+       }
+
+       d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops);
+       if (IS_ERR(d_phy->usb11_phy)) {
+               dev_err(dev, "Failed to create usb11 phy\n");
+               return PTR_ERR(d_phy->usb11_phy);
+       }
+
+       d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops);
+       if (IS_ERR(d_phy->usb20_phy)) {
+               dev_err(dev, "Failed to create usb20 phy\n");
+               return PTR_ERR(d_phy->usb20_phy);
+       }
+
+       platform_set_drvdata(pdev, d_phy);
+       phy_set_drvdata(d_phy->usb11_phy, d_phy);
+       phy_set_drvdata(d_phy->usb20_phy, d_phy);
+
+       if (node) {
+               d_phy->phy_provider = devm_of_phy_provider_register(dev,
+                                                       da8xx_usb_phy_of_xlate);
+               if (IS_ERR(d_phy->phy_provider)) {
+                       dev_err(dev, "Failed to create phy provider\n");
+                       return PTR_ERR(d_phy->phy_provider);
+               }
+       } else {
+               int ret;
+
+               ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy", "ohci.0");
+               if (ret)
+                       dev_warn(dev, "Failed to create usb11 phy lookup\n");
+               ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy",
+                                       "musb-da8xx");
+               if (ret)
+                       dev_warn(dev, "Failed to create usb20 phy lookup\n");
+       }
+
+       return 0;
+}
+
+static int da8xx_usb_phy_remove(struct platform_device *pdev)
+{
+       struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev);
+
+       if (!pdev->dev.of_node) {
+               phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx");
+               phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci.0");
+       }
+
+       return 0;
+}
+
+static const struct of_device_id da8xx_usb_phy_ids[] = {
+       { .compatible = "ti,da830-usb-phy" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids);
+
+static struct platform_driver da8xx_usb_phy_driver = {
+       .probe  = da8xx_usb_phy_probe,
+       .remove = da8xx_usb_phy_remove,
+       .driver = {
+               .name   = "da8xx-usb-phy",
+               .of_match_table = da8xx_usb_phy_ids,
+       },
+};
+
+module_platform_driver(da8xx_usb_phy_driver);
+
+MODULE_ALIAS("platform:da8xx-usb-phy");
+MODULE_AUTHOR("David Lechner <david@lechnology.com>");
+MODULE_DESCRIPTION("TI DA8xx USB PHY driver");
+MODULE_LICENSE("GPL v2");