[v1,3/7] usb: chipidea: add imx on-soc utmi phy driver

Message ID 1337090303-16046-4-git-send-email-richard.zhao@freescale.com
State New
Headers show

Commit Message

Richard Zhao May 15, 2012, 1:58 p.m.
Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
---
 drivers/usb/chipidea/Makefile       |    4 +
 drivers/usb/chipidea/phy-imx-utmi.c |  140 +++++++++++++++++++++++++++++++++++
 2 files changed, 144 insertions(+), 0 deletions(-)
 create mode 100644 drivers/usb/chipidea/phy-imx-utmi.c

Patch

diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index cc34937..0f34c0c 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -12,3 +12,7 @@  endif
 ifneq ($(CONFIG_ARCH_MSM),)
 	obj-$(CONFIG_USB_CHIPIDEA)	+= ci13xxx_msm.o
 endif
+
+ifneq ($(CONFIG_ARCH_MXC),)
+	obj-$(CONFIG_USB_CHIPIDEA)	+= phy-imx-utmi.o
+endif
diff --git a/drivers/usb/chipidea/phy-imx-utmi.c b/drivers/usb/chipidea/phy-imx-utmi.c
new file mode 100644
index 0000000..f7a0fe7
--- /dev/null
+++ b/drivers/usb/chipidea/phy-imx-utmi.c
@@ -0,0 +1,140 @@ 
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * 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/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#define DRIVER_NAME "imx_utmi"
+
+#define HW_USBPHY_PWD	(0x00000000)
+#define HW_USBPHY_CTRL	0x00000030
+
+#define BM_USBPHY_CTRL_SFTRST 0x80000000
+#define BM_USBPHY_CTRL_CLKGATE 0x40000000
+#define BM_USBPHY_CTRL_ENUTMILEVEL3 0x00008000
+#define BM_USBPHY_CTRL_ENUTMILEVEL2 0x00004000
+
+struct imx_utmi_phy {
+	struct usb_phy phy;
+	struct clk *clk;
+};
+
+#define to_imx_phy(p) container_of((p), struct imx_utmi_phy, phy)
+
+static int imx_utmi_phy_init(struct usb_phy *phy)
+{
+	struct imx_utmi_phy *imx_phy;
+	u32 reg;
+
+	imx_phy = to_imx_phy(phy);
+
+	clk_prepare_enable(imx_phy->clk);
+
+	reg = readl_relaxed(phy->io_priv + HW_USBPHY_CTRL);
+	reg &= ~BM_USBPHY_CTRL_CLKGATE;
+	writel_relaxed(reg, phy->io_priv + HW_USBPHY_CTRL);
+
+	/* Reset USBPHY module */
+	reg = readl_relaxed(phy->io_priv + HW_USBPHY_CTRL);
+	reg |= BM_USBPHY_CTRL_SFTRST;
+	writel_relaxed(reg, phy->io_priv + HW_USBPHY_CTRL);
+	udelay(10);
+
+	/* Remove CLKGATE and SFTRST */
+	reg = readl_relaxed(phy->io_priv + HW_USBPHY_CTRL);
+	reg &= ~(BM_USBPHY_CTRL_CLKGATE | BM_USBPHY_CTRL_SFTRST);
+	writel_relaxed(reg, phy->io_priv + HW_USBPHY_CTRL);
+	udelay(10);
+
+	/* Power up the PHY */
+	writel_relaxed(0, phy->io_priv + HW_USBPHY_PWD);
+	/* enable FS/LS device */
+	reg = readl_relaxed(phy->io_priv + HW_USBPHY_CTRL);
+	reg |= BM_USBPHY_CTRL_ENUTMILEVEL2 | BM_USBPHY_CTRL_ENUTMILEVEL3;
+	writel_relaxed(reg, phy->io_priv + HW_USBPHY_CTRL);
+
+	return 0;
+}
+
+static void imx_utmi_phy_shutdown(struct usb_phy *phy)
+{
+	struct imx_utmi_phy *imx_phy;
+
+	imx_phy = to_imx_phy(phy);
+	clk_disable_unprepare(imx_phy->clk);
+}
+
+static int imx_utmi_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	void __iomem *base;
+	struct clk *clk;
+	struct imx_utmi_phy *imx_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))
+		return PTR_ERR(clk);
+
+	imx_phy = devm_kzalloc(&pdev->dev, sizeof(*imx_phy), GFP_KERNEL);
+	if (!imx_phy)
+		return -ENOMEM;
+
+	imx_phy->phy.io_priv = base;
+	imx_phy->phy.dev = &pdev->dev;
+	imx_phy->phy.label = DRIVER_NAME;
+	imx_phy->phy.init = imx_utmi_phy_init;
+	imx_phy->phy.shutdown = imx_utmi_phy_shutdown;
+	imx_phy->clk = clk;
+	platform_set_drvdata(pdev, &imx_phy->phy);
+
+	return 0;
+}
+
+static const struct of_device_id imx_utmi_dt_ids[] = {
+	{ .compatible = "fsl,imx6q-usbphy", },
+	{ /* sentinel */ }
+};
+
+static struct platform_driver imx_utmi_driver = {
+	.probe = imx_utmi_probe,
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table = imx_utmi_dt_ids,
+	 },
+};
+
+static int __init imx_utmi_init(void)
+{
+	return platform_driver_register(&imx_utmi_driver);
+}
+postcore_initcall(imx_utmi_init);
+
+static void __exit imx_utmi_exit(void)
+{
+	platform_driver_unregister(&imx_utmi_driver);
+}
+module_exit(imx_utmi_exit);