Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0+
/*
 * Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller
 *
 * GRUSBHC is typically found on LEON/GRLIB SoCs
 *
 * (c) Jan Andersson <jan@gaisler.com>
 *
 * Based on ehci-ppc-of.c which is:
 * (c) Valentine Barshak <vbarshak@ru.mvista.com>
 * and in turn based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
 * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
 */
 
#include <linux/err.h>
#include <linux/signal.h>
 
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
 
#define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */
 
static const struct hc_driver ehci_grlib_hc_driver = {
<------>.description		= hcd_name,
<------>.product_desc		= "GRLIB GRUSBHC EHCI",
<------>.hcd_priv_size		= sizeof(struct ehci_hcd),
 
<------>/*
<------> * generic hardware linkage
<------> */
<------>.irq			= ehci_irq,
<------>.flags			= HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH,
 
<------>/*
<------> * basic lifecycle operations
<------> */
<------>.reset			= ehci_setup,
<------>.start			= ehci_run,
<------>.stop			= ehci_stop,
<------>.shutdown		= ehci_shutdown,
 
<------>/*
<------> * managing i/o requests and associated device resources
<------> */
<------>.urb_enqueue		= ehci_urb_enqueue,
<------>.urb_dequeue		= ehci_urb_dequeue,
<------>.endpoint_disable	= ehci_endpoint_disable,
<------>.endpoint_reset		= ehci_endpoint_reset,
 
<------>/*
<------> * scheduling support
<------> */
<------>.get_frame_number	= ehci_get_frame,
 
<------>/*
<------> * root hub support
<------> */
<------>.hub_status_data	= ehci_hub_status_data,
<------>.hub_control		= ehci_hub_control,
#ifdef	CONFIG_PM
<------>.bus_suspend		= ehci_bus_suspend,
<------>.bus_resume		= ehci_bus_resume,
#endif
<------>.relinquish_port	= ehci_relinquish_port,
<------>.port_handed_over	= ehci_port_handed_over,
 
<------>.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
};
 
 
static int ehci_hcd_grlib_probe(struct platform_device *op)
{
<------>struct device_node *dn = op->dev.of_node;
<------>struct usb_hcd *hcd;
<------>struct ehci_hcd	*ehci = NULL;
<------>struct resource res;
<------>u32 hc_capbase;
<------>int irq;
<------>int rv;
 
<------>if (usb_disabled())
<------><------>return -ENODEV;
 
<------>dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n");
 
<------>rv = of_address_to_resource(dn, 0, &res);
<------>if (rv)
<------><------>return rv;
 
<------>/* usb_create_hcd requires dma_mask != NULL */
<------>op->dev.dma_mask = &op->dev.coherent_dma_mask;
<------>hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev,
<------><------><------>"GRUSBHC EHCI USB");
<------>if (!hcd)
<------><------>return -ENOMEM;
 
<------>hcd->rsrc_start = res.start;
<------>hcd->rsrc_len = resource_size(&res);
 
<------>irq = irq_of_parse_and_map(dn, 0);
<------>if (irq == NO_IRQ) {
<------><------>dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
<------><------><------>__FILE__);
<------><------>rv = -EBUSY;
<------><------>goto err_irq;
<------>}
 
<------>hcd->regs = devm_ioremap_resource(&op->dev, &res);
<------>if (IS_ERR(hcd->regs)) {
<------><------>rv = PTR_ERR(hcd->regs);
<------><------>goto err_ioremap;
<------>}
 
<------>ehci = hcd_to_ehci(hcd);
 
<------>ehci->caps = hcd->regs;
 
<------>/* determine endianness of this implementation */
<------>hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase);
<------>if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) {
<------><------>ehci->big_endian_mmio = 1;
<------><------>ehci->big_endian_desc = 1;
<------><------>ehci->big_endian_capbase = 1;
<------>}
 
<------>rv = usb_add_hcd(hcd, irq, 0);
<------>if (rv)
<------><------>goto err_ioremap;
 
<------>device_wakeup_enable(hcd->self.controller);
<------>return 0;
 
err_ioremap:
<------>irq_dispose_mapping(irq);
err_irq:
<------>usb_put_hcd(hcd);
 
<------>return rv;
}
 
 
static int ehci_hcd_grlib_remove(struct platform_device *op)
{
<------>struct usb_hcd *hcd = platform_get_drvdata(op);
 
<------>dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n");
 
<------>usb_remove_hcd(hcd);
 
<------>irq_dispose_mapping(hcd->irq);
 
<------>usb_put_hcd(hcd);
 
<------>return 0;
}
 
 
static const struct of_device_id ehci_hcd_grlib_of_match[] = {
<------>{
<------><------>.name = "GAISLER_EHCI",
<------> },
<------>{
<------><------>.name = "01_026",
<------> },
<------>{},
};
MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match);
 
 
static struct platform_driver ehci_grlib_driver = {
<------>.probe		= ehci_hcd_grlib_probe,
<------>.remove		= ehci_hcd_grlib_remove,
<------>.shutdown	= usb_hcd_platform_shutdown,
<------>.driver = {
<------><------>.name = "grlib-ehci",
<------><------>.of_match_table = ehci_hcd_grlib_of_match,
<------>},
};