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