// 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 void 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);
        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);
}

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

#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");