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191 lines
4.8 KiB
191 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Generic UHCI HCD (Host Controller Driver) for Platform Devices |
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* |
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* Copyright (c) 2011 Tony Prisk <[email protected]> |
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* |
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* This file is based on uhci-grlib.c |
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* (C) Copyright 2004-2007 Alan Stern, [email protected] |
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*/ |
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#include <linux/of.h> |
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#include <linux/device.h> |
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#include <linux/platform_device.h> |
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static int uhci_platform_init(struct usb_hcd *hcd) |
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{ |
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struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
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/* Probe number of ports if not already provided by DT */ |
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if (!uhci->rh_numports) |
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uhci->rh_numports = uhci_count_ports(hcd); |
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/* Set up pointers to to generic functions */ |
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uhci->reset_hc = uhci_generic_reset_hc; |
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uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc; |
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/* No special actions need to be taken for the functions below */ |
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uhci->configure_hc = NULL; |
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uhci->resume_detect_interrupts_are_broken = NULL; |
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uhci->global_suspend_mode_is_broken = NULL; |
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/* Reset if the controller isn't already safely quiescent. */ |
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check_and_reset_hc(uhci); |
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return 0; |
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} |
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static const struct hc_driver uhci_platform_hc_driver = { |
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.description = hcd_name, |
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.product_desc = "Generic UHCI Host Controller", |
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.hcd_priv_size = sizeof(struct uhci_hcd), |
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/* Generic hardware linkage */ |
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.irq = uhci_irq, |
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.flags = HCD_MEMORY | HCD_DMA | HCD_USB11, |
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/* Basic lifecycle operations */ |
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.reset = uhci_platform_init, |
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.start = uhci_start, |
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#ifdef CONFIG_PM |
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.pci_suspend = NULL, |
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.pci_resume = NULL, |
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.bus_suspend = uhci_rh_suspend, |
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.bus_resume = uhci_rh_resume, |
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#endif |
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.stop = uhci_stop, |
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.urb_enqueue = uhci_urb_enqueue, |
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.urb_dequeue = uhci_urb_dequeue, |
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.endpoint_disable = uhci_hcd_endpoint_disable, |
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.get_frame_number = uhci_hcd_get_frame_number, |
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.hub_status_data = uhci_hub_status_data, |
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.hub_control = uhci_hub_control, |
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}; |
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static int uhci_hcd_platform_probe(struct platform_device *pdev) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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struct usb_hcd *hcd; |
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struct uhci_hcd *uhci; |
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struct resource *res; |
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int ret; |
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if (usb_disabled()) |
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return -ENODEV; |
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/* |
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* Right now device-tree probed devices don't get dma_mask set. |
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* Since shared usb code relies on it, set it here for now. |
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* Once we have dma capability bindings this can go away. |
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*/ |
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ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
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if (ret) |
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return ret; |
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hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev, |
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pdev->name); |
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if (!hcd) |
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return -ENOMEM; |
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uhci = hcd_to_uhci(hcd); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(hcd->regs)) { |
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ret = PTR_ERR(hcd->regs); |
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goto err_rmr; |
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} |
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hcd->rsrc_start = res->start; |
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hcd->rsrc_len = resource_size(res); |
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uhci->regs = hcd->regs; |
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/* Grab some things from the device-tree */ |
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if (np) { |
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u32 num_ports; |
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if (of_property_read_u32(np, "#ports", &num_ports) == 0) { |
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uhci->rh_numports = num_ports; |
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dev_info(&pdev->dev, |
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"Detected %d ports from device-tree\n", |
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num_ports); |
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} |
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if (of_device_is_compatible(np, "aspeed,ast2400-uhci") || |
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of_device_is_compatible(np, "aspeed,ast2500-uhci")) { |
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uhci->is_aspeed = 1; |
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dev_info(&pdev->dev, |
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"Enabled Aspeed implementation workarounds\n"); |
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} |
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} |
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/* Get and enable clock if any specified */ |
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uhci->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(uhci->clk)) { |
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ret = PTR_ERR(uhci->clk); |
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goto err_rmr; |
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} |
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ret = clk_prepare_enable(uhci->clk); |
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if (ret) { |
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dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret); |
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goto err_rmr; |
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} |
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ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED); |
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if (ret) |
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goto err_clk; |
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device_wakeup_enable(hcd->self.controller); |
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return 0; |
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err_clk: |
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clk_disable_unprepare(uhci->clk); |
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err_rmr: |
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usb_put_hcd(hcd); |
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return ret; |
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} |
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static int uhci_hcd_platform_remove(struct platform_device *pdev) |
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{ |
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struct usb_hcd *hcd = platform_get_drvdata(pdev); |
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struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
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clk_disable_unprepare(uhci->clk); |
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usb_remove_hcd(hcd); |
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usb_put_hcd(hcd); |
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return 0; |
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} |
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/* Make sure the controller is quiescent and that we're not using it |
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* any more. This is mainly for the benefit of programs which, like kexec, |
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* expect the hardware to be idle: not doing DMA or generating IRQs. |
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* |
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* This routine may be called in a damaged or failing kernel. Hence we |
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* do not acquire the spinlock before shutting down the controller. |
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*/ |
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static void uhci_hcd_platform_shutdown(struct platform_device *op) |
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{ |
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struct usb_hcd *hcd = platform_get_drvdata(op); |
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uhci_hc_died(hcd_to_uhci(hcd)); |
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} |
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static const struct of_device_id platform_uhci_ids[] = { |
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{ .compatible = "generic-uhci", }, |
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{ .compatible = "platform-uhci", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, platform_uhci_ids); |
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static struct platform_driver uhci_platform_driver = { |
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.probe = uhci_hcd_platform_probe, |
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.remove = uhci_hcd_platform_remove, |
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.shutdown = uhci_hcd_platform_shutdown, |
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.driver = { |
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.name = "platform-uhci", |
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.of_match_table = platform_uhci_ids, |
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}, |
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};
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