1 files changed, 484 insertions, 0 deletions
diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
new file mode 100644
index 000000000000..783367805c99
--- /dev/null
+++ b/drivers/usb/mtu3/mtu3_plat.c
@@ -0,0 +1,484 @@
+/*
+ * Copyright (C) 2016 MediaTek Inc.
+ *
+ * Author: Chunfeng Yun <[email protected]>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/dma-mapping.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+
+#include "mtu3.h"
+#include "mtu3_dr.h"
+
+/* u2-port0 should be powered on and enabled; */
+int ssusb_check_clocks(struct ssusb_mtk *ssusb, u32 ex_clks)
+{
+	void __iomem *ibase = ssusb->ippc_base;
+	u32 value, check_val;
+	int ret;
+
+	check_val = ex_clks | SSUSB_SYS125_RST_B_STS | SSUSB_SYSPLL_STABLE |
+			SSUSB_REF_RST_B_STS;
+
+	ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value,
+			(check_val == (value & check_val)), 100, 20000);
+	if (ret) {
+		dev_err(ssusb->dev, "clks of sts1 are not stable!\n");
+		return ret;
+	}
+
+	ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS2, value,
+			(value & SSUSB_U2_MAC_SYS_RST_B_STS), 100, 10000);
+	if (ret) {
+		dev_err(ssusb->dev, "mac2 clock is not stable\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ssusb_phy_init(struct ssusb_mtk *ssusb)
+{
+	int i;
+	int ret;
+
+	for (i = 0; i < ssusb->num_phys; i++) {
+		ret = phy_init(ssusb->phys[i]);
+		if (ret)
+			goto exit_phy;
+	}
+	return 0;
+
+exit_phy:
+	for (; i > 0; i--)
+		phy_exit(ssusb->phys[i - 1]);
+
+	return ret;
+}
+
+static int ssusb_phy_exit(struct ssusb_mtk *ssusb)
+{
+	int i;
+
+	for (i = 0; i < ssusb->num_phys; i++)
+		phy_exit(ssusb->phys[i]);
+
+	return 0;
+}
+
+static int ssusb_phy_power_on(struct ssusb_mtk *ssusb)
+{
+	int i;
+	int ret;
+
+	for (i = 0; i < ssusb->num_phys; i++) {
+		ret = phy_power_on(ssusb->phys[i]);
+		if (ret)
+			goto power_off_phy;
+	}
+	return 0;
+
+power_off_phy:
+	for (; i > 0; i--)
+		phy_power_off(ssusb->phys[i - 1]);
+
+	return ret;
+}
+
+static void ssusb_phy_power_off(struct ssusb_mtk *ssusb)
+{
+	unsigned int i;
+
+	for (i = 0; i < ssusb->num_phys; i++)
+		phy_power_off(ssusb->phys[i]);
+}
+
+static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
+{
+	int ret = 0;
+
+	ret = regulator_enable(ssusb->vusb33);
+	if (ret) {
+		dev_err(ssusb->dev, "failed to enable vusb33\n");
+		goto vusb33_err;
+	}
+
+	ret = clk_prepare_enable(ssusb->sys_clk);
+	if (ret) {
+		dev_err(ssusb->dev, "failed to enable sys_clk\n");
+		goto clk_err;
+	}
+
+	ret = ssusb_phy_init(ssusb);
+	if (ret) {
+		dev_err(ssusb->dev, "failed to init phy\n");
+		goto phy_init_err;
+	}
+
+	ret = ssusb_phy_power_on(ssusb);
+	if (ret) {
+		dev_err(ssusb->dev, "failed to power on phy\n");
+		goto phy_err;
+	}
+
+	return 0;
+
+phy_err:
+	ssusb_phy_exit(ssusb);
+phy_init_err:
+	clk_disable_unprepare(ssusb->sys_clk);
+clk_err:
+	regulator_disable(ssusb->vusb33);
+vusb33_err:
+
+	return ret;
+}
+
+static void ssusb_rscs_exit(struct ssusb_mtk *ssusb)
+{
+	clk_disable_unprepare(ssusb->sys_clk);
+	regulator_disable(ssusb->vusb33);
+	ssusb_phy_power_off(ssusb);
+	ssusb_phy_exit(ssusb);
+}
+
+static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
+{
+	/* reset whole ip (xhci & u3d) */
+	mtu3_setbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
+	udelay(1);
+	mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
+}
+
+static int get_iddig_pinctrl(struct ssusb_mtk *ssusb)
+{
+	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
+
+	otg_sx->id_pinctrl = devm_pinctrl_get(ssusb->dev);
+	if (IS_ERR(otg_sx->id_pinctrl)) {
+		dev_err(ssusb->dev, "Cannot find id pinctrl!\n");
+		return PTR_ERR(otg_sx->id_pinctrl);
+	}
+
+	otg_sx->id_float =
+		pinctrl_lookup_state(otg_sx->id_pinctrl, "id_float");
+	if (IS_ERR(otg_sx->id_float)) {
+		dev_err(ssusb->dev, "Cannot find pinctrl id_float!\n");
+		return PTR_ERR(otg_sx->id_float);
+	}
+
+	otg_sx->id_ground =
+		pinctrl_lookup_state(otg_sx->id_pinctrl, "id_ground");
+	if (IS_ERR(otg_sx->id_ground)) {
+		dev_err(ssusb->dev, "Cannot find pinctrl id_ground!\n");
+		return PTR_ERR(otg_sx->id_ground);
+	}
+
+	return 0;
+}
+
+static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
+	struct device *dev = &pdev->dev;
+	struct regulator *vbus;
+	struct resource *res;
+	int i;
+	int ret;
+
+	ssusb->num_phys = of_count_phandle_with_args(node,
+			"phys", "#phy-cells");
+	if (ssusb->num_phys > 0) {
+		ssusb->phys = devm_kcalloc(dev, ssusb->num_phys,
+					sizeof(*ssusb->phys), GFP_KERNEL);
+		if (!ssusb->phys)
+			return -ENOMEM;
+	} else {
+		ssusb->num_phys = 0;
+	}
+
+	for (i = 0; i < ssusb->num_phys; i++) {
+		ssusb->phys[i] = devm_of_phy_get_by_index(dev, node, i);
+		if (IS_ERR(ssusb->phys[i])) {
+			dev_err(dev, "failed to get phy-%d\n", i);
+			return PTR_ERR(ssusb->phys[i]);
+		}
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ippc");
+	ssusb->ippc_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(ssusb->ippc_base)) {
+		dev_err(dev, "failed to map memory for ippc\n");
+		return PTR_ERR(ssusb->ippc_base);
+	}
+
+	ssusb->vusb33 = devm_regulator_get(&pdev->dev, "vusb33");
+	if (IS_ERR(ssusb->vusb33)) {
+		dev_err(dev, "failed to get vusb33\n");
+		return PTR_ERR(ssusb->vusb33);
+	}
+
+	ssusb->sys_clk = devm_clk_get(dev, "sys_ck");
+	if (IS_ERR(ssusb->sys_clk)) {
+		dev_err(dev, "failed to get sys clock\n");
+		return PTR_ERR(ssusb->sys_clk);
+	}
+
+	ssusb->dr_mode = usb_get_dr_mode(dev);
+	if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN) {
+		dev_err(dev, "dr_mode is error\n");
+		return -EINVAL;
+	}
+
+	if (ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
+		return 0;
+
+	/* if host role is supported */
+	ret = ssusb_wakeup_of_property_parse(ssusb, node);
+	if (ret)
+		return ret;
+
+	if (ssusb->dr_mode != USB_DR_MODE_OTG)
+		return 0;
+
+	/* if dual-role mode is supported */
+	vbus = devm_regulator_get(&pdev->dev, "vbus");
+	if (IS_ERR(vbus)) {
+		dev_err(dev, "failed to get vbus\n");
+		return PTR_ERR(vbus);
+	}
+	otg_sx->vbus = vbus;
+
+	otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
+	otg_sx->manual_drd_enabled =
+		of_property_read_bool(node, "enable-manual-drd");
+
+	if (of_property_read_bool(node, "extcon")) {
+		otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
+		if (IS_ERR(otg_sx->edev)) {
+			dev_err(ssusb->dev, "couldn't get extcon device\n");
+			return -EPROBE_DEFER;
+		}
+		if (otg_sx->manual_drd_enabled) {
+			ret = get_iddig_pinctrl(ssusb);
+			if (ret)
+				return ret;
+		}
+	}
+
+	dev_info(dev, "dr_mode: %d, is_u3_dr: %d\n",
+		ssusb->dr_mode, otg_sx->is_u3_drd);
+
+	return 0;
+}
+
+static int mtu3_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	struct ssusb_mtk *ssusb;
+	int ret = -ENOMEM;
+
+	/* all elements are set to ZERO as default value */
+	ssusb = devm_kzalloc(dev, sizeof(*ssusb), GFP_KERNEL);
+	if (!ssusb)
+		return -ENOMEM;
+
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(dev, "No suitable DMA config available\n");
+		return -ENOTSUPP;
+	}
+
+	platform_set_drvdata(pdev, ssusb);
+	ssusb->dev = dev;
+
+	ret = get_ssusb_rscs(pdev, ssusb);
+	if (ret)
+		return ret;
+
+	/* enable power domain */
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+	device_enable_async_suspend(dev);
+
+	ret = ssusb_rscs_init(ssusb);
+	if (ret)
+		goto comm_init_err;
+
+	ssusb_ip_sw_reset(ssusb);
+
+	if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
+		ssusb->dr_mode = USB_DR_MODE_HOST;
+	else if (IS_ENABLED(CONFIG_USB_MTU3_GADGET))
+		ssusb->dr_mode = USB_DR_MODE_PERIPHERAL;
+
+	/* default as host */
+	ssusb->is_host = !(ssusb->dr_mode == USB_DR_MODE_PERIPHERAL);
+
+	switch (ssusb->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+		ret = ssusb_gadget_init(ssusb);
+		if (ret) {
+			dev_err(dev, "failed to initialize gadget\n");
+			goto comm_exit;
+		}
+		break;
+	case USB_DR_MODE_HOST:
+		ret = ssusb_host_init(ssusb, node);
+		if (ret) {
+			dev_err(dev, "failed to initialize host\n");
+			goto comm_exit;
+		}
+		break;
+	case USB_DR_MODE_OTG:
+		ret = ssusb_gadget_init(ssusb);
+		if (ret) {
+			dev_err(dev, "failed to initialize gadget\n");
+			goto comm_exit;
+		}
+
+		ret = ssusb_host_init(ssusb, node);
+		if (ret) {
+			dev_err(dev, "failed to initialize host\n");
+			goto gadget_exit;
+		}
+
+		ssusb_otg_switch_init(ssusb);
+		break;
+	default:
+		dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
+		ret = -EINVAL;
+		goto comm_exit;
+	}
+
+	return 0;
+
+gadget_exit:
+	ssusb_gadget_exit(ssusb);
+comm_exit:
+	ssusb_rscs_exit(ssusb);
+comm_init_err:
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
+
+	return ret;
+}
+
+static int mtu3_remove(struct platform_device *pdev)
+{
+	struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
+
+	switch (ssusb->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+		ssusb_gadget_exit(ssusb);
+		break;
+	case USB_DR_MODE_HOST:
+		ssusb_host_exit(ssusb);
+		break;
+	case USB_DR_MODE_OTG:
+		ssusb_otg_switch_exit(ssusb);
+		ssusb_gadget_exit(ssusb);
+		ssusb_host_exit(ssusb);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ssusb_rscs_exit(ssusb);
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+/*
+ * when support dual-role mode, we reject suspend when
+ * it works as device mode;
+ */
+static int __maybe_unused mtu3_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
+
+	dev_dbg(dev, "%s\n", __func__);
+
+	/* REVISIT: disconnect it for only device mode? */
+	if (!ssusb->is_host)
+		return 0;
+
+	ssusb_host_disable(ssusb, true);
+	ssusb_phy_power_off(ssusb);
+	clk_disable_unprepare(ssusb->sys_clk);
+	ssusb_wakeup_enable(ssusb);
+
+	return 0;
+}
+
+static int __maybe_unused mtu3_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
+
+	dev_dbg(dev, "%s\n", __func__);
+
+	if (!ssusb->is_host)
+		return 0;
+
+	ssusb_wakeup_disable(ssusb);
+	clk_prepare_enable(ssusb->sys_clk);
+	ssusb_phy_power_on(ssusb);
+	ssusb_host_enable(ssusb);
+
+	return 0;
+}
+
+static const struct dev_pm_ops mtu3_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mtu3_suspend, mtu3_resume)
+};
+
+#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &mtu3_pm_ops : NULL)
+
+#ifdef CONFIG_OF
+
+static const struct of_device_id mtu3_of_match[] = {
+	{.compatible = "mediatek,mt8173-mtu3",},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, mtu3_of_match);
+
+#endif
+
+static struct platform_driver mtu3_driver = {
+	.probe = mtu3_probe,
+	.remove = mtu3_remove,
+	.driver = {
+		.name = MTU3_DRIVER_NAME,
+		.pm = DEV_PM_OPS,
+		.of_match_table = of_match_ptr(mtu3_of_match),
+	},
+};
+module_platform_driver(mtu3_driver);
+
+MODULE_AUTHOR("Chunfeng Yun <[email protected]>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek USB3 DRD Controller Driver");