usb/host/ohci-sm501.c

// SPDX-License-Identifier: GPL-1.0+
/*
 * OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2005 David Brownell
 * (C) Copyright 2002 Hewlett-Packard Company
 * (C) Copyright 2008 Magnus Damm
 *
 * SM501 Bus Glue - based on ohci-omap.c
 *
 * This file is licenced under the GPL.
 */

#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/sm501.h>
#include <linux/sm501-regs.h>

static int ohci_sm501_init(struct usb_hcd *hcd)
{
	return ohci_init(hcd_to_ohci(hcd));
}

static int ohci_sm501_start(struct usb_hcd *hcd)
{
	struct device *dev = hcd->self.controller;
	int ret;

	ret = ohci_run(hcd_to_ohci(hcd));
	if (ret < 0) {
		dev_err(dev, "can't start %s", hcd->self.bus_name);
		ohci_stop(hcd);
	}

	return ret;
}

/*-------------------------------------------------------------------------*/

static const struct hc_driver ohci_sm501_hc_driver = {
	.description =		hcd_name,
	.product_desc =		"SM501 OHCI",
	.hcd_priv_size =	sizeof(struct ohci_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq =			ohci_irq,
	.flags =		HCD_USB11 | HCD_MEMORY,

	/*
	 * basic lifecycle operations
	 */
	.reset =		ohci_sm501_init,
	.start =		ohci_sm501_start,
	.stop =			ohci_stop,
	.shutdown =		ohci_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue =		ohci_urb_enqueue,
	.urb_dequeue =		ohci_urb_dequeue,
	.endpoint_disable =	ohci_endpoint_disable,

	/*
	 * scheduling support
	 */
	.get_frame_number =	ohci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data =	ohci_hub_status_data,
	.hub_control =		ohci_hub_control,
#ifdef	CONFIG_PM
	.bus_suspend =		ohci_bus_suspend,
	.bus_resume =		ohci_bus_resume,
#endif
	.start_port_reset =	ohci_start_port_reset,
};

/*-------------------------------------------------------------------------*/

static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
{
	const struct hc_driver *driver = &ohci_sm501_hc_driver;
	struct device *dev = &pdev->dev;
	struct resource	*res, *mem;
	int retval, irq;
	struct usb_hcd *hcd = NULL;

	irq = retval = platform_get_irq(pdev, 0);
	if (retval < 0)
		goto err0;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (mem == NULL) {
		dev_err(dev, "no resource definition for memory\n");
		retval = -ENOENT;
		goto err0;
	}

	if (!request_mem_region(mem->start, resource_size(mem), pdev->name)) {
		dev_err(dev, "request_mem_region failed\n");
		retval = -EBUSY;
		goto err0;
	}

	/* allocate, reserve and remap resources for registers */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(dev, "no resource definition for registers\n");
		retval = -ENOENT;
		goto err1;
	}

	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		retval = -ENOMEM;
		goto err1;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,	pdev->name)) {
		dev_err(dev, "request_mem_region failed\n");
		retval = -EBUSY;
		goto err3;
	}

	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (hcd->regs == NULL) {
		dev_err(dev, "cannot remap registers\n");
		retval = -ENXIO;
		goto err4;
	}

	ohci_hcd_init(hcd_to_ohci(hcd));

	/* The sm501 chip is equipped with local memory that may be used
	 * by on-chip devices such as the video controller and the usb host.
	 * This driver uses genalloc so that usb allocations with
	 * gen_pool_dma_alloc() allocate from this local memory. The dma_handle
	 * returned by gen_pool_dma_alloc() will be an offset starting from 0
	 * for the first local memory byte.
	 *
	 * So as long as data is allocated using gen_pool_dma_alloc() all is
	 * fine. This is however not always the case - buffers may be allocated
	 * using kmalloc() - so the usb core needs to be told that it must copy
	 * data into our local memory if the buffers happen to be placed in
	 * regular memory. A non-null hcd->localmem_pool initialized by
	 * the call to usb_hcd_setup_local_mem() below does just that.
	 */

	retval = usb_hcd_setup_local_mem(hcd, mem->start,
					 mem->start - mem->parent->start,
					 resource_size(mem));
	if (retval < 0)
		goto err5;
	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (retval)
		goto err5;
	device_wakeup_enable(hcd->self.controller);

	/* enable power and unmask interrupts */

	sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
	sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);

	return 0;
err5:
	iounmap(hcd->regs);
err4:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err3:
	usb_put_hcd(hcd);
err1:
	release_mem_region(mem->start, resource_size(mem));
err0:
	return retval;
}

static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct resource	*mem;

	usb_remove_hcd(hcd);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (mem)
		release_mem_region(mem->start, resource_size(mem));

	/* mask interrupts and disable power */

	sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
	sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);

	return 0;
}

/*-------------------------------------------------------------------------*/

#ifdef CONFIG_PM
static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
{
	struct device *dev = &pdev->dev;
	struct usb_hcd  *hcd = platform_get_drvdata(pdev);
	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
	bool do_wakeup = device_may_wakeup(dev);
	int ret;

	if (time_before(jiffies, ohci->next_statechange))
		msleep(5);
	ohci->next_statechange = jiffies;

	ret = ohci_suspend(hcd, do_wakeup);
	if (ret)
		return ret;

	sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
	return ret;
}

static int ohci_sm501_resume(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);

	if (time_before(jiffies, ohci->next_statechange))
		msleep(5);
	ohci->next_statechange = jiffies;

	sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
	ohci_resume(hcd, false);
	return 0;
}
#else
#define ohci_sm501_suspend NULL
#define ohci_sm501_resume NULL
#endif

/*-------------------------------------------------------------------------*/

/*
 * Driver definition to register with the SM501 bus
 */
static struct platform_driver ohci_hcd_sm501_driver = {
	.probe		= ohci_hcd_sm501_drv_probe,
	.remove		= ohci_hcd_sm501_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.suspend	= ohci_sm501_suspend,
	.resume		= ohci_sm501_resume,
	.driver		= {
		.name	= "sm501-usb",
	},
};
MODULE_ALIAS("platform:sm501-usb");