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@xxxxxxx> Cc: Chen Peter-B29397 <B29397@xxxxxxxxxxxxx> Cc: Detlev Zundel <dzu@xxxxxxx> Cc: Fabio Estevam <festevam@xxxxxxxxx> Cc: Li Frank-B20596 <B20596@xxxxxxxxxxxxx> Cc: Lin Tony-B19295 <B19295@xxxxxxxxxxxxx> Cc: Linux USB <linux-usb@xxxxxxxxxxxxxxx> Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> Cc: Shawn Guo <shawn.guo@xxxxxxxxxxxxx> Cc: Shawn Guo <shawn.guo@xxxxxxxxxx> Cc: Stefano Babic <sbabic@xxxxxxx> Cc: Subodh Nijsure <snijsure@xxxxxxxxxxxx> Cc: Tony Lin <tony.lin@xxxxxxxxxxxxx> Cc: Wolfgang Denk <wd@xxxxxxx> --- 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@xxxxxxx> + * 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@xxxxxxx>"); +MODULE_DESCRIPTION("Freescale i.MX28 USB PHY driver"); +MODULE_LICENSE("GPL"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html