| /* |
| * Driver for EHCI UHP on Atmel chips |
| * |
| * Copyright (C) 2009 Atmel Corporation, |
| * Nicolas Ferre <nicolas.ferre@atmel.com> |
| * |
| * Based on various ehci-*.c drivers |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file COPYING in the main directory of this archive for |
| * more details. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_platform.h> |
| #include <linux/platform_device.h> |
| #include <linux/usb.h> |
| #include <linux/usb/hcd.h> |
| |
| #include "ehci.h" |
| |
| #define DRIVER_DESC "EHCI Atmel driver" |
| |
| static const char hcd_name[] = "ehci-atmel"; |
| static struct hc_driver __read_mostly ehci_atmel_hc_driver; |
| |
| /* interface and function clocks */ |
| static struct clk *iclk, *fclk; |
| static int clocked; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void atmel_start_clock(void) |
| { |
| clk_prepare_enable(iclk); |
| clk_prepare_enable(fclk); |
| clocked = 1; |
| } |
| |
| static void atmel_stop_clock(void) |
| { |
| clk_disable_unprepare(fclk); |
| clk_disable_unprepare(iclk); |
| clocked = 0; |
| } |
| |
| static void atmel_start_ehci(struct platform_device *pdev) |
| { |
| dev_dbg(&pdev->dev, "start\n"); |
| atmel_start_clock(); |
| } |
| |
| static void atmel_stop_ehci(struct platform_device *pdev) |
| { |
| dev_dbg(&pdev->dev, "stop\n"); |
| atmel_stop_clock(); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static int ehci_atmel_drv_probe(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd; |
| const struct hc_driver *driver = &ehci_atmel_hc_driver; |
| struct resource *res; |
| struct ehci_hcd *ehci; |
| int irq; |
| int retval; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| pr_debug("Initializing Atmel-SoC USB Host Controller\n"); |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq <= 0) { |
| dev_err(&pdev->dev, |
| "Found HC with no IRQ. Check %s setup!\n", |
| dev_name(&pdev->dev)); |
| retval = -ENODEV; |
| goto fail_create_hcd; |
| } |
| |
| /* Right now device-tree probed devices don't get dma_mask set. |
| * Since shared usb code relies on it, set it here for now. |
| * Once we have dma capability bindings this can go away. |
| */ |
| retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
| if (retval) |
| goto fail_create_hcd; |
| |
| hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
| if (!hcd) { |
| retval = -ENOMEM; |
| goto fail_create_hcd; |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) { |
| dev_err(&pdev->dev, |
| "Found HC with no register addr. Check %s setup!\n", |
| dev_name(&pdev->dev)); |
| retval = -ENODEV; |
| goto fail_request_resource; |
| } |
| hcd->rsrc_start = res->start; |
| hcd->rsrc_len = resource_size(res); |
| |
| hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(hcd->regs)) { |
| retval = PTR_ERR(hcd->regs); |
| goto fail_request_resource; |
| } |
| |
| iclk = devm_clk_get(&pdev->dev, "ehci_clk"); |
| if (IS_ERR(iclk)) { |
| dev_err(&pdev->dev, "Error getting interface clock\n"); |
| retval = -ENOENT; |
| goto fail_request_resource; |
| } |
| fclk = devm_clk_get(&pdev->dev, "uhpck"); |
| if (IS_ERR(fclk)) { |
| dev_err(&pdev->dev, "Error getting function clock\n"); |
| retval = -ENOENT; |
| goto fail_request_resource; |
| } |
| |
| ehci = hcd_to_ehci(hcd); |
| /* registers start at offset 0x0 */ |
| ehci->caps = hcd->regs; |
| |
| atmel_start_ehci(pdev); |
| |
| retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
| if (retval) |
| goto fail_add_hcd; |
| |
| return retval; |
| |
| fail_add_hcd: |
| atmel_stop_ehci(pdev); |
| fail_request_resource: |
| usb_put_hcd(hcd); |
| fail_create_hcd: |
| dev_err(&pdev->dev, "init %s fail, %d\n", |
| dev_name(&pdev->dev), retval); |
| |
| return retval; |
| } |
| |
| static int ehci_atmel_drv_remove(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| |
| usb_remove_hcd(hcd); |
| usb_put_hcd(hcd); |
| |
| atmel_stop_ehci(pdev); |
| fclk = iclk = NULL; |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id atmel_ehci_dt_ids[] = { |
| { .compatible = "atmel,at91sam9g45-ehci" }, |
| { /* sentinel */ } |
| }; |
| |
| MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); |
| #endif |
| |
| static struct platform_driver ehci_atmel_driver = { |
| .probe = ehci_atmel_drv_probe, |
| .remove = ehci_atmel_drv_remove, |
| .shutdown = usb_hcd_platform_shutdown, |
| .driver = { |
| .name = "atmel-ehci", |
| .of_match_table = of_match_ptr(atmel_ehci_dt_ids), |
| }, |
| }; |
| |
| static int __init ehci_atmel_init(void) |
| { |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
| ehci_init_driver(&ehci_atmel_hc_driver, NULL); |
| return platform_driver_register(&ehci_atmel_driver); |
| } |
| module_init(ehci_atmel_init); |
| |
| static void __exit ehci_atmel_cleanup(void) |
| { |
| platform_driver_unregister(&ehci_atmel_driver); |
| } |
| module_exit(ehci_atmel_cleanup); |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_ALIAS("platform:atmel-ehci"); |
| MODULE_AUTHOR("Nicolas Ferre"); |
| MODULE_LICENSE("GPL"); |