From mboxrd@z Thu Jan 1 00:00:00 1970 From: marex@denx.de (Marek Vasut) Date: Wed, 18 Apr 2012 19:46:30 +0200 Subject: [PATCH 06/10] MXS: Add imx-usb driver In-Reply-To: <1334771194-18688-1-git-send-email-marex@denx.de> References: <1334714869-19282-1-git-send-email-marex@denx.de> <1334771194-18688-1-git-send-email-marex@denx.de> Message-ID: <1334771194-18688-7-git-send-email-marex@denx.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This driver handles claiming of clocks and memory areas. These are later properly delegated to it's child device, the USB Host. Signed-off-by: Marek Vasut Cc: Chen Peter-B29397 Cc: Detlev Zundel Cc: Fabio Estevam Cc: Li Frank-B20596 Cc: Lin Tony-B19295 Cc: Linux USB Cc: Sascha Hauer Cc: Shawn Guo Cc: Shawn Guo Cc: Stefano Babic Cc: Subodh Nijsure Cc: Tony Lin Cc: Wolfgang Denk --- drivers/usb/otg/Kconfig | 6 ++ drivers/usb/otg/Makefile | 1 + drivers/usb/otg/imx-usb.c | 226 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 233 insertions(+) create mode 100644 drivers/usb/otg/imx-usb.c diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig index 5c87db0..e7c6325 100644 --- a/drivers/usb/otg/Kconfig +++ b/drivers/usb/otg/Kconfig @@ -116,6 +116,12 @@ config FSL_USB2_OTG help Enable this to support Freescale USB OTG transceiver. +config USB_IMX_COMPOSITE + bool + help + Composite driver that handles clock and memory mapping for + i.MX USB host and USB PHY. + 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 41aa509..e3feaca 100644 --- a/drivers/usb/otg/Makefile +++ b/drivers/usb/otg/Makefile @@ -20,4 +20,5 @@ obj-$(CONFIG_USB_MSM_OTG) += msm_otg.o obj-$(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_MV_OTG) += mv_otg.o diff --git a/drivers/usb/otg/imx-usb.c b/drivers/usb/otg/imx-usb.c new file mode 100644 index 0000000..8e8af95 --- /dev/null +++ b/drivers/usb/otg/imx-usb.c @@ -0,0 +1,226 @@ +/* + * drivers/usb/otg/imx-usb.c + * + * Freescale i.MX USB composite driver. + * + * Copyright (C) 2012 Marek Vasut + * 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 +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +/* + * Allocate platform device with the DMA mask, this is borrowed from + * arch/arm/mach-mxs/devices.c + */ +static struct platform_device *__devinit add_platform_device( + const char *name, int id, + const void *data, size_t size_data, u64 dmamask) +{ + int ret = -ENOMEM; + struct platform_device *pdev; + + pdev = platform_device_alloc(name, id); + if (!pdev) + goto err; + + if (dmamask) { + /* + * This memory isn't freed when the device is put, + * I don't have a nice idea for that though. Conceptually + * dma_mask in struct device should not be a pointer. + * See http://thread.gmane.org/gmane.linux.kernel.pci/9081 + */ + pdev->dev.dma_mask = + kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); + if (!pdev->dev.dma_mask) + /* ret is still -ENOMEM; */ + goto err; + + *pdev->dev.dma_mask = dmamask; + pdev->dev.coherent_dma_mask = dmamask; + } + + if (data) { + ret = platform_device_add_data(pdev, data, size_data); + if (ret) + goto err; + } + + ret = platform_device_add(pdev); + if (ret) { +err: + if (dmamask) + kfree(pdev->dev.dma_mask); + platform_device_put(pdev); + return ERR_PTR(ret); + } + + return pdev; +} + +static int __devinit imx_usb_probe(struct platform_device *pdev) +{ + struct imx_usb *data; + int ret; + void *retp = NULL; + + /* + * Until further notice, this claims all necessary resources. + */ + + /* Allocate driver's private date. */ + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) { + ret = -ENOMEM; + goto err_alloc_data; + } + + /* Claim the Host clock. */ + data->clk = clk_get(&pdev->dev, "usb"); + if (IS_ERR(data->clk)) { + dev_err(&pdev->dev, "Failed to claim clock for USB Host\n"); + ret = PTR_ERR(data->clk); + goto err_claim_host_clock; + } + + /* Prepare Host clock. */ + ret = clk_prepare(data->clk); + if (ret) { + dev_err(&pdev->dev, "Failed to prepare clock for USB Host.\n"); + goto err_prepare_host_clock; + } + + /* Get memory area for EHCI host from resources. */ + data->mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!data->mem_res) { + dev_err(&pdev->dev, "Specify memory area for this USB Host!\n"); + ret = -ENODEV; + goto err_get_host_resource; + } + + /* Request the memory region for this USB Host. */ + retp = devm_request_mem_region(&pdev->dev, data->mem_res->start, + resource_size(data->mem_res), pdev->name); + if (!retp) { + dev_err(&pdev->dev, "USB Host memory area already in use!\n"); + ret = -EBUSY; + goto err_get_host_mem; + } + + /* Map the memory region for USB Host. */ + data->mem = devm_ioremap(&pdev->dev, data->mem_res->start, + resource_size(data->mem_res)); + if (!data->mem) { + dev_err(&pdev->dev, "Memory mapping of USB Host failed!\n"); + ret = -EFAULT; + goto err_map_host_mem; + } + + /* Get IRQ for EHCI host from resources. */ + data->irq = platform_get_irq(pdev, 0); + if (data->irq < 0) { + dev_err(&pdev->dev, "Specify IRQ for this USB Host!\n"); + ret = -ENODEV; + goto err_get_host_irq; + } + + /* + * Now finally probe the Host driver! + */ + data->pdev = add_platform_device("mxs-ehci", -1, data, sizeof(*data), + DMA_BIT_MASK(32)); + if (!data->pdev) { + dev_err(&pdev->dev, "Failed registering Host!\n"); + ret = -ENODEV; + goto err_register_host; + } + + return 0; + +err_register_host: +err_get_host_irq: + iounmap(data->mem); +err_map_host_mem: + release_mem_region(data->mem_res->start, + resource_size(data->mem_res)); +err_get_host_mem: + data->mem_res = NULL; +err_get_host_resource: + clk_unprepare(data->clk); +err_prepare_host_clock: + clk_put(data->clk); +err_claim_host_clock: + kfree(data); +err_alloc_data: + return ret; +} + +static int __devexit imx_usb_remove(struct platform_device *pdev) +{ + struct imx_usb *data = platform_get_drvdata(pdev); + + platform_device_unregister(data->pdev); + + iounmap(data->mem); + release_mem_region(data->mem_res->start, + resource_size(data->mem_res)); + data->mem_res = NULL; + clk_unprepare(data->clk); + clk_put(data->clk); + kfree(data); + + return 0; +} + +static struct platform_driver imx_usb_driver = { + .probe = imx_usb_probe, + .remove = __devexit_p(imx_usb_remove), + .driver = { + .name = "imx-usb", + .owner = THIS_MODULE, + }, +}; + +static int __init imx_usb_init(void) +{ + return platform_driver_register(&imx_usb_driver); +} + +static void __exit imx_usb_exit(void) +{ + platform_driver_unregister(&imx_usb_driver); +} + +module_init(imx_usb_init); +module_exit(imx_usb_exit); + +MODULE_ALIAS("platform:imx-usb"); +MODULE_AUTHOR("Marek Vasut "); +MODULE_DESCRIPTION("Freescale i.MX USB composite driver"); +MODULE_LICENSE("GPL"); -- 1.7.9.5