1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/phy/ti/phy-dm816x-usb.c b/drivers/phy/ti/phy-dm816x-usb.c
new file mode 100644
index 000000000..fb619908f
--- /dev/null
+++ b/drivers/phy/ti/phy-dm816x-usb.c
@@ -0,0 +1,286 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/io.h>
+#include <linux/usb/phy_companion.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/delay.h>
+#include <linux/phy/phy.h>
+#include <linux/of_platform.h>
+
+#include <linux/mfd/syscon.h>
+
+/*
+ * TRM has two sets of USB_CTRL registers.. The correct register bits
+ * are in TRM section 24.9.8.2 USB_CTRL Register. The TRM documents the
+ * phy as being SR70LX Synopsys USB 2.0 OTG nanoPHY. It also seems at
+ * least dm816x rev c ignores writes to USB_CTRL register, but the TI
+ * kernel is writing to those so it's possible that later revisions
+ * have worknig USB_CTRL register.
+ *
+ * Also note that At least USB_CTRL register seems to be dm816x specific
+ * according to the TRM. It's possible that USBPHY_CTRL is more generic,
+ * but that would have to be checked against the SR70LX documentation
+ * which does not seem to be publicly available.
+ *
+ * Finally, the phy on dm814x and am335x is different from dm816x.
+ */
+#define DM816X_USB_CTRL_PHYCLKSRC	BIT(8)	/* 1 = PLL ref clock */
+#define DM816X_USB_CTRL_PHYSLEEP1	BIT(1)	/* Enable the first phy */
+#define DM816X_USB_CTRL_PHYSLEEP0	BIT(0)	/* Enable the second phy */
+
+#define DM816X_USBPHY_CTRL_TXRISETUNE	1
+#define DM816X_USBPHY_CTRL_TXVREFTUNE	0xc
+#define DM816X_USBPHY_CTRL_TXPREEMTUNE	0x2
+
+struct dm816x_usb_phy {
+	struct regmap *syscon;
+	struct device *dev;
+	unsigned int instance;
+	struct clk *refclk;
+	struct usb_phy phy;
+	unsigned int usb_ctrl;		/* Shared between phy0 and phy1 */
+	unsigned int usbphy_ctrl;
+};
+
+static int dm816x_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host)
+{
+	otg->host = host;
+	if (!host)
+		otg->state = OTG_STATE_UNDEFINED;
+
+	return 0;
+}
+
+static int dm816x_usb_phy_set_peripheral(struct usb_otg *otg,
+					 struct usb_gadget *gadget)
+{
+	otg->gadget = gadget;
+	if (!gadget)
+		otg->state = OTG_STATE_UNDEFINED;
+
+	return 0;
+}
+
+static int dm816x_usb_phy_init(struct phy *x)
+{
+	struct dm816x_usb_phy *phy = phy_get_drvdata(x);
+	unsigned int val;
+
+	if (clk_get_rate(phy->refclk) != 24000000)
+		dev_warn(phy->dev, "nonstandard phy refclk\n");
+
+	/* Set PLL ref clock and put phys to sleep */
+	regmap_update_bits(phy->syscon, phy->usb_ctrl,
+			   DM816X_USB_CTRL_PHYCLKSRC |
+			   DM816X_USB_CTRL_PHYSLEEP1 |
+			   DM816X_USB_CTRL_PHYSLEEP0,
+			   0);
+	regmap_read(phy->syscon, phy->usb_ctrl, &val);
+	if ((val & 3) != 0)
+		dev_info(phy->dev,
+			 "Working dm816x USB_CTRL! (0x%08x)\n",
+			 val);
+
+	/*
+	 * TI kernel sets these values for "symmetrical eye diagram and
+	 * better signal quality" so let's assume somebody checked the
+	 * values with a scope and set them here too.
+	 */
+	regmap_read(phy->syscon, phy->usbphy_ctrl, &val);
+	val |= DM816X_USBPHY_CTRL_TXRISETUNE |
+		DM816X_USBPHY_CTRL_TXVREFTUNE |
+		DM816X_USBPHY_CTRL_TXPREEMTUNE;
+	regmap_write(phy->syscon, phy->usbphy_ctrl, val);
+
+	return 0;
+}
+
+static const struct phy_ops ops = {
+	.init		= dm816x_usb_phy_init,
+	.owner		= THIS_MODULE,
+};
+
+static int __maybe_unused dm816x_usb_phy_runtime_suspend(struct device *dev)
+{
+	struct dm816x_usb_phy *phy = dev_get_drvdata(dev);
+	unsigned int mask, val;
+	int error = 0;
+
+	mask = BIT(phy->instance);
+	val = ~BIT(phy->instance);
+	error = regmap_update_bits(phy->syscon, phy->usb_ctrl,
+				   mask, val);
+	if (error)
+		dev_err(phy->dev, "phy%i failed to power off\n",
+			phy->instance);
+	clk_disable(phy->refclk);
+
+	return 0;
+}
+
+static int __maybe_unused dm816x_usb_phy_runtime_resume(struct device *dev)
+{
+	struct dm816x_usb_phy *phy = dev_get_drvdata(dev);
+	unsigned int mask, val;
+	int error;
+
+	error = clk_enable(phy->refclk);
+	if (error)
+		return error;
+
+	/*
+	 * Note that at least dm816x rev c does not seem to do
+	 * anything with the USB_CTRL register. But let's follow
+	 * what the TI tree is doing in case later revisions use
+	 * USB_CTRL.
+	 */
+	mask = BIT(phy->instance);
+	val = BIT(phy->instance);
+	error = regmap_update_bits(phy->syscon, phy->usb_ctrl,
+				   mask, val);
+	if (error) {
+		dev_err(phy->dev, "phy%i failed to power on\n",
+			phy->instance);
+		clk_disable(phy->refclk);
+		return error;
+	}
+
+	return 0;
+}
+
+static UNIVERSAL_DEV_PM_OPS(dm816x_usb_phy_pm_ops,
+			    dm816x_usb_phy_runtime_suspend,
+			    dm816x_usb_phy_runtime_resume,
+			    NULL);
+
+#ifdef CONFIG_OF
+static const struct of_device_id dm816x_usb_phy_id_table[] = {
+	{
+		.compatible = "ti,dm8168-usb-phy",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, dm816x_usb_phy_id_table);
+#endif
+
+static int dm816x_usb_phy_probe(struct platform_device *pdev)
+{
+	struct dm816x_usb_phy *phy;
+	struct resource *res;
+	struct phy *generic_phy;
+	struct phy_provider *phy_provider;
+	struct usb_otg *otg;
+	const struct of_device_id *of_id;
+	int error;
+
+	of_id = of_match_device(of_match_ptr(dm816x_usb_phy_id_table),
+				&pdev->dev);
+	if (!of_id)
+		return -EINVAL;
+
+	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOENT;
+
+	phy->syscon = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+						      "syscon");
+	if (IS_ERR(phy->syscon))
+		return PTR_ERR(phy->syscon);
+
+	/*
+	 * According to sprs614e.pdf, the first usb_ctrl is shared and
+	 * the second instance for usb_ctrl is reserved.. Also the
+	 * register bits are different from earlier TRMs.
+	 */
+	phy->usb_ctrl = 0x20;
+	phy->usbphy_ctrl = (res->start & 0xff) + 4;
+	if (phy->usbphy_ctrl == 0x2c)
+		phy->instance = 1;
+
+	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
+	if (!otg)
+		return -ENOMEM;
+
+	phy->dev = &pdev->dev;
+	phy->phy.dev = phy->dev;
+	phy->phy.label = "dm8168_usb_phy";
+	phy->phy.otg = otg;
+	phy->phy.type = USB_PHY_TYPE_USB2;
+	otg->set_host = dm816x_usb_phy_set_host;
+	otg->set_peripheral = dm816x_usb_phy_set_peripheral;
+	otg->usb_phy = &phy->phy;
+
+	platform_set_drvdata(pdev, phy);
+
+	phy->refclk = devm_clk_get(phy->dev, "refclk");
+	if (IS_ERR(phy->refclk))
+		return PTR_ERR(phy->refclk);
+	error = clk_prepare(phy->refclk);
+	if (error)
+		return error;
+
+	pm_runtime_enable(phy->dev);
+	generic_phy = devm_phy_create(phy->dev, NULL, &ops);
+	if (IS_ERR(generic_phy)) {
+		error = PTR_ERR(generic_phy);
+		goto clk_unprepare;
+	}
+
+	phy_set_drvdata(generic_phy, phy);
+
+	phy_provider = devm_of_phy_provider_register(phy->dev,
+						     of_phy_simple_xlate);
+	if (IS_ERR(phy_provider)) {
+		error = PTR_ERR(phy_provider);
+		goto clk_unprepare;
+	}
+
+	usb_add_phy_dev(&phy->phy);
+
+	return 0;
+
+clk_unprepare:
+	pm_runtime_disable(phy->dev);
+	clk_unprepare(phy->refclk);
+	return error;
+}
+
+static int dm816x_usb_phy_remove(struct platform_device *pdev)
+{
+	struct dm816x_usb_phy *phy = platform_get_drvdata(pdev);
+
+	usb_remove_phy(&phy->phy);
+	pm_runtime_disable(phy->dev);
+	clk_unprepare(phy->refclk);
+
+	return 0;
+}
+
+static struct platform_driver dm816x_usb_phy_driver = {
+	.probe		= dm816x_usb_phy_probe,
+	.remove		= dm816x_usb_phy_remove,
+	.driver		= {
+		.name	= "dm816x-usb-phy",
+		.pm	= &dm816x_usb_phy_pm_ops,
+		.of_match_table = of_match_ptr(dm816x_usb_phy_id_table),
+	},
+};
+
+module_platform_driver(dm816x_usb_phy_driver);
+
+MODULE_ALIAS("platform:dm816x_usb");
+MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
+MODULE_DESCRIPTION("dm816x usb phy driver");
+MODULE_LICENSE("GPL v2");