From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 4/5] USB: Add usb phy driver for i.MX
Date: Sun, 20 Jan 2013 11:19:53 +0100 [thread overview]
Message-ID: <1358677194-23423-5-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1358677194-23423-1-git-send-email-s.hauer@pengutronix.de>
This phy is found on i.MX6 and i.MX23/28. Currently tested only on i.MX6.
For now we take the easy way out. The phy is enabled upon registration.
More elaborated handling can be added later.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
drivers/usb/imx/Kconfig | 5 ++
drivers/usb/imx/Makefile | 1 +
drivers/usb/imx/imx-usb-phy.c | 105 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 111 insertions(+)
create mode 100644 drivers/usb/imx/imx-usb-phy.c
diff --git a/drivers/usb/imx/Kconfig b/drivers/usb/imx/Kconfig
index 2c52e72..b1ce682 100644
--- a/drivers/usb/imx/Kconfig
+++ b/drivers/usb/imx/Kconfig
@@ -13,3 +13,8 @@ config USB_IMX_CHIPIDEA
This driver is recommended for new designs, but it needs board
support to work.
It's safe to say yes here. Also select EHCI support for USB host.
+
+config USB_IMX_PHY
+ bool
+ depends on ARCH_IMX
+ default y if ARCH_IMX6
diff --git a/drivers/usb/imx/Makefile b/drivers/usb/imx/Makefile
index e37361c..e15bc71 100644
--- a/drivers/usb/imx/Makefile
+++ b/drivers/usb/imx/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_USB_IMX_CHIPIDEA) += imx-usb-misc.o chipidea-imx.o
+obj-$(CONFIG_USB_IMX_PHY) += imx-usb-phy.o
diff --git a/drivers/usb/imx/imx-usb-phy.c b/drivers/usb/imx/imx-usb-phy.c
new file mode 100644
index 0000000..ce9c93f
--- /dev/null
+++ b/drivers/usb/imx/imx-usb-phy.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2013 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * 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; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * 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 <common.h>
+#include <init.h>
+#include <io.h>
+#include <driver.h>
+#include <malloc.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#define SET 0x4
+#define CLR 0x8
+
+#define USBPHY_CTRL 0x30
+
+#define USBPHY_CTRL_SFTRST (1 << 31)
+#define USBPHY_CTRL_CLKGATE (1 << 30)
+#define USBPHY_CTRL_ENUTMILEVEL3 (1 << 15)
+#define USBPHY_CTRL_ENUTMILEVEL2 (1 << 14)
+
+struct imx_usbphy {
+ void __iomem *base;
+ struct clk *clk;
+};
+
+static int imx_usbphy_enable(struct imx_usbphy *imxphy)
+{
+ u32 val;
+
+ clk_enable(imxphy->clk);
+
+ /* reset usbphy */
+ writel(USBPHY_CTRL_SFTRST, imxphy->base + USBPHY_CTRL + SET);
+
+ udelay(10);
+
+ /* clr reset and clkgate */
+ writel(USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE,
+ imxphy->base + USBPHY_CTRL + CLR);
+
+ /* clr all pwd bits => power up phy */
+ writel(0xffffffff, imxphy->base + CLR);
+
+ /* set utmilvl2/3 */
+ val = readl(imxphy->base + USBPHY_CTRL);
+ val |= USBPHY_CTRL_ENUTMILEVEL3 | USBPHY_CTRL_ENUTMILEVEL2;
+ writel(val, imxphy->base + USBPHY_CTRL + SET);
+
+ return 0;
+}
+
+static int imx_usbphy_probe(struct device_d *dev)
+{
+ int ret;
+ struct imx_usbphy *imxphy;
+
+ imxphy = xzalloc(sizeof(*imxphy));
+
+ imxphy->base = dev_request_mem_region(dev, 0);
+ if (!imxphy->base) {
+ ret = -ENODEV;
+ goto err_free;
+ }
+
+ imxphy->clk = clk_get(dev, NULL);
+ if (IS_ERR(imxphy->clk)) {
+ dev_err(dev, "could not get clk: %s\n", strerror(-PTR_ERR(imxphy->clk)));
+ goto err_clk;
+ }
+
+ imx_usbphy_enable(imxphy);
+
+ dev_dbg(dev, "phy enabled\n");
+
+ return 0;
+
+err_clk:
+err_free:
+ free(imxphy);
+
+ return ret;
+};
+
+static struct driver_d imx_usbphy_driver = {
+ .name = "imx-usb-phy",
+ .probe = imx_usbphy_probe,
+};
+
+static int imx_usbphy_init(void)
+{
+ return platform_driver_register(&imx_usbphy_driver);
+}
+coredevice_initcall(imx_usbphy_init);
--
1.7.10.4
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next prev parent reply other threads:[~2013-01-20 10:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-20 10:19 [PATCH] i.MX6 USB phy support Sascha Hauer
2013-01-20 10:19 ` [PATCH 1/5] ARM i.MX6 USB phy: Fix phy function names Sascha Hauer
2013-01-20 10:19 ` [PATCH 2/5] ARM i.MX6: Fix usb phy base addresses Sascha Hauer
2013-01-20 10:19 ` [PATCH 3/5] ARM i.MX6: Add usbphy clocks Sascha Hauer
2013-01-20 10:19 ` Sascha Hauer [this message]
2013-01-20 10:19 ` [PATCH 5/5] ARM i.MX6: Add Chipidea support Sascha Hauer
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