usb: otg: add basic mxs phy driver support
mxs phy is used in Freescale i.MX SoCs, for example
imx23, imx28, imx6Q. This patch adds the basic host
support.
Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Peter Chen <peter.chen@freescale.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Tested-by: Subodh Nijsure <snijsure@grid-net.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/otg/mxs-phy.c b/drivers/usb/otg/mxs-phy.c
new file mode 100644
index 0000000..c1a67cb
--- /dev/null
+++ b/drivers/usb/otg/mxs-phy.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright (C) 2012 Marek Vasut <marex@denx.de>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/usb/otg.h>
+#include <linux/stmp_device.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#define DRIVER_NAME "mxs_phy"
+
+#define HW_USBPHY_PWD 0x00
+#define HW_USBPHY_CTRL 0x30
+#define HW_USBPHY_CTRL_SET 0x34
+#define HW_USBPHY_CTRL_CLR 0x38
+
+#define BM_USBPHY_CTRL_SFTRST BIT(31)
+#define BM_USBPHY_CTRL_CLKGATE BIT(30)
+#define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15)
+#define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14)
+#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1)
+
+struct mxs_phy {
+ struct usb_phy phy;
+ struct clk *clk;
+};
+
+#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
+
+static void mxs_phy_hw_init(struct mxs_phy *mxs_phy)
+{
+ void __iomem *base = mxs_phy->phy.io_priv;
+
+ stmp_reset_block(base + HW_USBPHY_CTRL);
+
+ /* Power up the PHY */
+ writel_relaxed(0, base + HW_USBPHY_PWD);
+
+ /* enable FS/LS device */
+ writel_relaxed(BM_USBPHY_CTRL_ENUTMILEVEL2 |
+ BM_USBPHY_CTRL_ENUTMILEVEL3,
+ base + HW_USBPHY_CTRL_SET);
+}
+
+static int mxs_phy_init(struct usb_phy *phy)
+{
+ struct mxs_phy *mxs_phy = to_mxs_phy(phy);
+
+ clk_prepare_enable(mxs_phy->clk);
+ mxs_phy_hw_init(mxs_phy);
+
+ return 0;
+}
+
+static void mxs_phy_shutdown(struct usb_phy *phy)
+{
+ struct mxs_phy *mxs_phy = to_mxs_phy(phy);
+
+ writel_relaxed(BM_USBPHY_CTRL_CLKGATE,
+ phy->io_priv + HW_USBPHY_CTRL_SET);
+
+ clk_disable_unprepare(mxs_phy->clk);
+}
+
+static int mxs_phy_on_connect(struct usb_phy *phy, int port)
+{
+ dev_dbg(phy->dev, "Connect on port %d\n", port);
+
+ mxs_phy_hw_init(to_mxs_phy(phy));
+ writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
+ phy->io_priv + HW_USBPHY_CTRL_SET);
+
+ return 0;
+}
+
+static int mxs_phy_on_disconnect(struct usb_phy *phy, int port)
+{
+ dev_dbg(phy->dev, "Disconnect on port %d\n", port);
+
+ writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
+ phy->io_priv + HW_USBPHY_CTRL_CLR);
+
+ return 0;
+}
+
+static int mxs_phy_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ void __iomem *base;
+ struct clk *clk;
+ struct mxs_phy *mxs_phy;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "can't get device resources\n");
+ return -ENOENT;
+ }
+
+ base = devm_request_and_ioremap(&pdev->dev, res);
+ if (!base)
+ return -EBUSY;
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev,
+ "can't get the clock, err=%ld", PTR_ERR(clk));
+ return PTR_ERR(clk);
+ }
+
+ mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
+ if (!mxs_phy) {
+ dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
+ return -ENOMEM;
+ }
+
+ mxs_phy->phy.io_priv = base;
+ mxs_phy->phy.dev = &pdev->dev;
+ mxs_phy->phy.label = DRIVER_NAME;
+ mxs_phy->phy.init = mxs_phy_init;
+ mxs_phy->phy.shutdown = mxs_phy_shutdown;
+ mxs_phy->phy.notify_connect = mxs_phy_on_connect;
+ mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
+
+ ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
+
+ mxs_phy->clk = clk;
+
+ platform_set_drvdata(pdev, &mxs_phy->phy);
+
+ return 0;
+}
+
+static int __devexit mxs_phy_remove(struct platform_device *pdev)
+{
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id mxs_phy_dt_ids[] = {
+ { .compatible = "fsl,imx23-usbphy", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
+
+static struct platform_driver mxs_phy_driver = {
+ .probe = mxs_phy_probe,
+ .remove = __devexit_p(mxs_phy_remove),
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = mxs_phy_dt_ids,
+ },
+};
+
+static int __init mxs_phy_module_init(void)
+{
+ return platform_driver_register(&mxs_phy_driver);
+}
+postcore_initcall(mxs_phy_module_init);
+
+static void __exit mxs_phy_module_exit(void)
+{
+ platform_driver_unregister(&mxs_phy_driver);
+}
+module_exit(mxs_phy_module_exit);
+
+MODULE_ALIAS("platform:mxs-usb-phy");
+MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
+MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
+MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
+MODULE_LICENSE("GPL");