[PATCH 07/10] MXS: Add USB PHY driver
Marek Vasut
marex at denx.de
Wed Apr 18 13:46:31 EDT 2012
Add driver that controls the built-in USB PHY in the i.MX233/i.MX28. This
enables the PHY upon powerup and shuts it down on shutdown.
Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Chen Peter-B29397 <B29397 at freescale.com>
Cc: Detlev Zundel <dzu at denx.de>
Cc: Fabio Estevam <festevam at gmail.com>
Cc: Li Frank-B20596 <B20596 at freescale.com>
Cc: Lin Tony-B19295 <B19295 at freescale.com>
Cc: Linux USB <linux-usb at vger.kernel.org>
Cc: Sascha Hauer <s.hauer at pengutronix.de>
Cc: Shawn Guo <shawn.guo at freescale.com>
Cc: Shawn Guo <shawn.guo at linaro.org>
Cc: Stefano Babic <sbabic at denx.de>
Cc: Subodh Nijsure <snijsure at grid-net.com>
Cc: Tony Lin <tony.lin at freescale.com>
Cc: Wolfgang Denk <wd at denx.de>
---
drivers/usb/otg/Kconfig | 10 ++
drivers/usb/otg/Makefile | 1 +
drivers/usb/otg/mxs-phy.c | 305 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 316 insertions(+)
create mode 100644 drivers/usb/otg/mxs-phy.c
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index e7c6325..1de1495 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -122,6 +122,16 @@ config USB_IMX_COMPOSITE
Composite driver that handles clock and memory mapping for
i.MX USB host and USB PHY.
+config USB_MXS_PHY
+ tristate "Freescale i.MX28 USB PHY support"
+ select USB_OTG_UTILS
+ select USB_IMX_COMPOSITE
+ help
+ Say Y here if you want to build Freescale i.MX28 USB PHY
+ driver in kernel.
+
+ To compile this driver as a module, choose M here.
+
config USB_MV_OTG
tristate "Marvell USB OTG support"
depends on USB_EHCI_MV && USB_MV_UDC && USB_SUSPEND
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index e3feaca..56700b3 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -21,4 +21,5 @@ obj-$(CONFIG_AB8500_USB) += ab8500-usb.o
fsl_usb2_otg-objs := fsl_otg.o otg_fsm.o
obj-$(CONFIG_FSL_USB2_OTG) += fsl_usb2_otg.o
obj-$(CONFIG_USB_IMX_COMPOSITE) += imx-usb.o
+obj-$(CONFIG_USB_MXS_PHY) += mxs-phy.o
obj-$(CONFIG_USB_MV_OTG) += mv_otg.o
diff --git a/drivers/usb/otg/mxs-phy.c b/drivers/usb/otg/mxs-phy.c
new file mode 100644
index 0000000..2ee1240
--- /dev/null
+++ b/drivers/usb/otg/mxs-phy.c
@@ -0,0 +1,305 @@
+/*
+ * drivers/usb/otg/mxs-phy.c
+ *
+ * Freescale i.MX28 USB PHY driver.
+ *
+ * Copyright (C) 2012 Marek Vasut <marex at denx.de>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fsl_devices.h>
+
+#include <linux/usb.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/hcd.h>
+
+#include <mach/common.h>
+#include <mach/hardware.h>
+#include <mach/devices-common.h>
+#include <mach/mx28.h>
+
+#define HW_USBPHY_PWD 0x00
+
+#define HW_USBPHY_CTRL 0x30
+#define HW_USBPHY_CTRL_SET 0x34
+#define HW_USBPHY_CTRL_CLR 0x38
+#define HW_USBPHY_CTRL_TOG 0x3c
+
+#define BM_USBPHY_CTRL_SFTRST (1 << 31)
+#define BM_USBPHY_CTRL_CLKGATE (1 << 30)
+#define BM_USBPHY_CTRL_ENUTMILEVEL3 (1 << 15)
+#define BM_USBPHY_CTRL_ENUTMILEVEL2 (1 << 14)
+#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT (1 << 1)
+
+struct mxs_usb_phy {
+ struct usb_phy phy;
+
+ struct work_struct work;
+
+ struct clk *clk;
+ struct resource *mem_res;
+ void __iomem *mem;
+ int irq;
+};
+
+static int mxs_usb_set_vbus(struct usb_otg *otg, bool enabled)
+{
+ struct usb_phy *x = otg->phy;
+ struct mxs_usb_phy *phy = container_of(x, struct mxs_usb_phy, phy);
+
+ if (enabled)
+ writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
+ phy->mem + HW_USBPHY_CTRL_CLR);
+ else
+ writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
+ phy->mem + HW_USBPHY_CTRL_SET);
+
+ return 0;
+}
+
+static int mxs_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
+{
+ struct usb_phy *x = otg->phy;
+ struct mxs_usb_phy *phy = container_of(x, struct mxs_usb_phy, phy);
+
+ /* So far, we support only host mode, so be quick here. */
+ otg->host = host;
+ schedule_work(&phy->work);
+
+ return 0;
+}
+
+static void mxs_usb_work(struct work_struct *w)
+{
+ struct mxs_usb_phy *phy = container_of(w, struct mxs_usb_phy, work);
+ struct usb_otg *otg = phy->phy.otg;
+ struct usb_hcd *hcd;
+
+ switch (otg->phy->state) {
+ case OTG_STATE_A_HOST:
+ if (otg->host) {
+ hcd = bus_to_hcd(otg->host);
+ usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+static int mxs_usb_phy_init(struct usb_phy *x)
+{
+ struct mxs_usb_phy *phy = container_of(x, struct mxs_usb_phy, phy);
+ uint32_t val;
+
+ /* Enable clock to the PHY. */
+ clk_enable(phy->clk);
+
+ /* Reset the PHY block. */
+ mxs_reset_block(phy->mem + HW_USBPHY_CTRL);
+
+ /* Power up the PHY. */
+ writel(0, phy->mem + HW_USBPHY_PWD);
+
+ /* Enable FS/LS compatibility and HS disconnection detector. */
+ val = BM_USBPHY_CTRL_ENUTMILEVEL2 | BM_USBPHY_CTRL_ENUTMILEVEL3 |
+ BM_USBPHY_CTRL_ENHOSTDISCONDETECT;
+ writel(val, phy->mem + HW_USBPHY_CTRL_SET);
+
+ return 0;
+}
+
+static void mxs_usb_phy_shutdown(struct usb_phy *x)
+{
+ struct mxs_usb_phy *phy = container_of(x, struct mxs_usb_phy, phy);
+
+ /* Gate off the PHY. */
+ writel(BM_USBPHY_CTRL_CLKGATE, phy->mem + HW_USBPHY_CTRL_SET);
+
+ /* Disable clock to the PHY. */
+ clk_disable(phy->clk);
+}
+
+static int __devinit mxs_phy_probe(struct platform_device *pdev)
+{
+ struct mxs_usb_phy *phy;
+ void *retp;
+ int ret;
+
+ /* Allocate PHY driver's private date. */
+ phy = kzalloc(sizeof(*phy), GFP_KERNEL);
+ if (!phy) {
+ dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
+ ret = -ENOMEM;
+ goto err_alloc_phy;
+ }
+
+ /* Allocate OTG structure. */
+ phy->phy.otg = kzalloc(sizeof(*phy->phy.otg), GFP_KERNEL);
+ if (!phy->phy.otg) {
+ dev_err(&pdev->dev, "Failed to allocate USB OTG structure!\n");
+ ret = -ENOMEM;
+ goto err_alloc_otg;
+ }
+
+ /* Claim the PHY clock. */
+ phy->clk = clk_get(&pdev->dev, "phy");
+ if (!phy->clk) {
+ dev_err(&pdev->dev, "Failed to claim clock for USB PHY\n");
+ ret = PTR_ERR(phy->clk);
+ goto err_claim_phy_clock;
+ }
+
+ /* Prepare PHY clock. */
+ ret = clk_prepare(phy->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to prepare clock for USB PHY.\n");
+ goto err_prepare_phy_clock;
+ }
+
+ /* Get memory area for PHY from resources. */
+ phy->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!phy->mem_res) {
+ dev_err(&pdev->dev, "Specify memory area for this USB PHY!\n");
+ ret = -ENODEV;
+ goto err_get_phy_resource;
+ }
+
+ /* Request the memory region for this USB PHY. */
+ retp = devm_request_mem_region(&pdev->dev, phy->mem_res->start,
+ resource_size(phy->mem_res), pdev->name);
+ if (!retp) {
+ dev_err(&pdev->dev, "USB PHY memory area already in use!\n");
+ ret = -EBUSY;
+ goto err_get_phy_mem;
+ }
+
+ /* Map the memory region for USB PHY. */
+ phy->mem = devm_ioremap(&pdev->dev, phy->mem_res->start,
+ resource_size(phy->mem_res));
+ if (!phy->mem) {
+ dev_err(&pdev->dev, "Memory mapping of USB PHY failed!\n");
+ ret = -EFAULT;
+ goto err_map_phy_mem;
+ }
+
+ /* Setup the PHY structures. */
+ phy->phy.dev = &pdev->dev;
+ phy->phy.label = "mxs-usb-phy";
+ phy->phy.init = mxs_usb_phy_init;
+ phy->phy.shutdown = mxs_usb_phy_shutdown;
+ phy->phy.state = OTG_STATE_A_HOST;
+
+ phy->phy.otg->phy = &phy->phy;
+ phy->phy.otg->set_vbus = mxs_usb_set_vbus;
+ phy->phy.otg->set_host = mxs_usb_set_host;
+
+ platform_set_drvdata(pdev, phy);
+
+ ATOMIC_INIT_NOTIFIER_HEAD(&phy->phy.notifier);
+
+ INIT_WORK(&phy->work, mxs_usb_work);
+
+ /* Register the transceiver with kernel. */
+ ret = usb_set_transceiver(&phy->phy);
+ if (ret) {
+ dev_err(&pdev->dev, "Can't register transceiver, (%d)\n", ret);
+ goto err_set_transceiver;
+ }
+
+ return 0;
+
+err_set_transceiver:
+ iounmap(phy->mem);
+err_map_phy_mem:
+ release_mem_region(phy->mem_res->start, resource_size(phy->mem_res));
+err_get_phy_mem:
+ phy->mem_res = NULL;
+err_get_phy_resource:
+ clk_unprepare(phy->clk);
+err_prepare_phy_clock:
+ clk_put(phy->clk);
+err_claim_phy_clock:
+ kfree(phy->phy.otg);
+err_alloc_otg:
+ kfree(phy);
+err_alloc_phy:
+ return ret;
+}
+
+static int __devexit mxs_phy_remove(struct platform_device *pdev)
+{
+ struct mxs_usb_phy *phy = platform_get_drvdata(pdev);
+
+ /* Stop the PHY work. */
+ cancel_work_sync(&phy->work);
+
+ /* Power down the PHY. */
+ mxs_usb_phy_shutdown(&phy->phy);
+
+ /* Remove the transceiver. */
+ usb_set_transceiver(NULL);
+
+ /* Unmap the PHY's memory region. */
+ iounmap(phy->mem);
+ release_mem_region(phy->mem_res->start, resource_size(phy->mem_res));
+
+ /* Stop the PHY clock. */
+ clk_disable_unprepare(phy->clk);
+ clk_put(phy->clk);
+
+ /* Free the rest. */
+ platform_set_drvdata(pdev, NULL);
+ kfree(phy->phy.otg);
+ kfree(phy);
+
+ return 0;
+}
+
+static struct platform_driver mxs_phy_driver = {
+ .probe = mxs_phy_probe,
+ .remove = __devexit_p(mxs_phy_remove),
+ .driver = {
+ .name = "mxs-usb-phy",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init mxs_phy_init(void)
+{
+ return platform_driver_register(&mxs_phy_driver);
+}
+
+static void __exit mxs_phy_exit(void)
+{
+ platform_driver_unregister(&mxs_phy_driver);
+}
+
+subsys_initcall(mxs_phy_init);
+module_exit(mxs_phy_exit);
+
+MODULE_ALIAS("platform:mxs-usb-phy");
+MODULE_AUTHOR("Marek Vasut <marex at denx.de>");
+MODULE_DESCRIPTION("Freescale i.MX28 USB PHY driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5
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