// SPDX-License-Identifier: GPL-2.0
/*
 *  PS3 EHCI Host Controller driver
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 */

#include <asm/firmware.h>
#include <asm/ps3.h>

static void ps3_ehci_setup_insnreg(struct ehci_hcd *ehci)
{
        /* PS3 HC internal setup register offsets. */

        enum ps3_ehci_hc_insnreg {
                ps3_ehci_hc_insnreg01 = 0x084,
                ps3_ehci_hc_insnreg02 = 0x088,
                ps3_ehci_hc_insnreg03 = 0x08c,
        };

        /* PS3 EHCI HC errata fix 316 - The PS3 EHCI HC will reset its
         * internal INSNREGXX setup regs back to the chip default values
         * on Host Controller Reset (CMD_RESET) or Light Host Controller
         * Reset (CMD_LRESET).  The work-around for this is for the HC
         * driver to re-initialise these regs when ever the HC is reset.
         */

        /* Set burst transfer counts to 256 out, 32 in. */

        writel_be(0x01000020, (void __iomem *)ehci->regs +
                ps3_ehci_hc_insnreg01);

        /* Enable burst transfer counts. */

        writel_be(0x00000001, (void __iomem *)ehci->regs +
                ps3_ehci_hc_insnreg03);
}

static int ps3_ehci_hc_reset(struct usb_hcd *hcd)
{
        int result;
        struct ehci_hcd *ehci = hcd_to_ehci(hcd);

        ehci->big_endian_mmio = 1;
        ehci->caps = hcd->regs;

        result = ehci_setup(hcd);
        if (result)
                return result;

        ps3_ehci_setup_insnreg(ehci);

        return result;
}

static const struct hc_driver ps3_ehci_hc_driver = {
        .description            = hcd_name,
        .product_desc           = "PS3 EHCI Host Controller",
        .hcd_priv_size          = sizeof(struct ehci_hcd),
        .irq                    = ehci_irq,
        .flags                  = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH,
        .reset                  = ps3_ehci_hc_reset,
        .start                  = ehci_run,
        .stop                   = ehci_stop,
        .shutdown               = ehci_shutdown,
        .urb_enqueue            = ehci_urb_enqueue,
        .urb_dequeue            = ehci_urb_dequeue,
        .endpoint_disable       = ehci_endpoint_disable,
        .endpoint_reset         = ehci_endpoint_reset,
        .get_frame_number       = ehci_get_frame,
        .hub_status_data        = ehci_hub_status_data,
        .hub_control            = ehci_hub_control,
#if defined(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 ps3_ehci_probe(struct ps3_system_bus_device *dev)
{
        int result;
        struct usb_hcd *hcd;
        unsigned int virq;
        static u64 dummy_mask;

        if (usb_disabled()) {
                result = -ENODEV;
                goto fail_start;
        }

        result = ps3_open_hv_device(dev);

        if (result) {
                dev_dbg(&dev->core, "%s:%d: ps3_open_hv_device failed\n",
                        __func__, __LINE__);
                goto fail_open;
        }

        result = ps3_dma_region_create(dev->d_region);

        if (result) {
                dev_dbg(&dev->core, "%s:%d: ps3_dma_region_create failed: "
                        "(%d)\n", __func__, __LINE__, result);
                BUG_ON("check region type");
                goto fail_dma_region;
        }

        result = ps3_mmio_region_create(dev->m_region);

        if (result) {
                dev_dbg(&dev->core, "%s:%d: ps3_map_mmio_region failed\n",
                        __func__, __LINE__);
                result = -EPERM;
                goto fail_mmio_region;
        }

        dev_dbg(&dev->core, "%s:%d: mmio mapped_addr %lxh\n", __func__,
                __LINE__, dev->m_region->lpar_addr);

        result = ps3_io_irq_setup(PS3_BINDING_CPU_ANY, dev->interrupt_id, &virq);

        if (result) {
                dev_dbg(&dev->core, "%s:%d: ps3_construct_io_irq(%d) failed.\n",
                        __func__, __LINE__, virq);
                result = -EPERM;
                goto fail_irq;
        }

        dummy_mask = DMA_BIT_MASK(32);
        dev->core.dma_mask = &dummy_mask;
        dma_set_coherent_mask(&dev->core, dummy_mask);

        hcd = usb_create_hcd(&ps3_ehci_hc_driver, &dev->core, dev_name(&dev->core));

        if (!hcd) {
                dev_dbg(&dev->core, "%s:%d: usb_create_hcd failed\n", __func__,
                        __LINE__);
                result = -ENOMEM;
                goto fail_create_hcd;
        }

        hcd->rsrc_start = dev->m_region->lpar_addr;
        hcd->rsrc_len = dev->m_region->len;

        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name))
                dev_dbg(&dev->core, "%s:%d: request_mem_region failed\n",
                        __func__, __LINE__);

        hcd->regs = ioremap(dev->m_region->lpar_addr, dev->m_region->len);

        if (!hcd->regs) {
                dev_dbg(&dev->core, "%s:%d: ioremap failed\n", __func__,
                        __LINE__);
                result = -EPERM;
                goto fail_ioremap;
        }

        dev_dbg(&dev->core, "%s:%d: hcd->rsrc_start %lxh\n", __func__, __LINE__,
                (unsigned long)hcd->rsrc_start);
        dev_dbg(&dev->core, "%s:%d: hcd->rsrc_len   %lxh\n", __func__, __LINE__,
                (unsigned long)hcd->rsrc_len);
        dev_dbg(&dev->core, "%s:%d: hcd->regs       %lxh\n", __func__, __LINE__,
                (unsigned long)hcd->regs);
        dev_dbg(&dev->core, "%s:%d: virq            %lu\n", __func__, __LINE__,
                (unsigned long)virq);

        ps3_system_bus_set_drvdata(dev, hcd);

        result = usb_add_hcd(hcd, virq, 0);

        if (result) {
                dev_dbg(&dev->core, "%s:%d: usb_add_hcd failed (%d)\n",
                        __func__, __LINE__, result);
                goto fail_add_hcd;
        }

        device_wakeup_enable(hcd->self.controller);
        return result;

fail_add_hcd:
        iounmap(hcd->regs);
fail_ioremap:
        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
        usb_put_hcd(hcd);
fail_create_hcd:
        ps3_io_irq_destroy(virq);
fail_irq:
        ps3_free_mmio_region(dev->m_region);
fail_mmio_region:
        ps3_dma_region_free(dev->d_region);
fail_dma_region:
        ps3_close_hv_device(dev);
fail_open:
fail_start:
        return result;
}

static int ps3_ehci_remove(struct ps3_system_bus_device *dev)
{
        unsigned int tmp;
        struct usb_hcd *hcd = ps3_system_bus_get_drvdata(dev);

        BUG_ON(!hcd);

        dev_dbg(&dev->core, "%s:%d: regs %p\n", __func__, __LINE__, hcd->regs);
        dev_dbg(&dev->core, "%s:%d: irq %u\n", __func__, __LINE__, hcd->irq);

        tmp = hcd->irq;

        usb_remove_hcd(hcd);

        ps3_system_bus_set_drvdata(dev, NULL);

        BUG_ON(!hcd->regs);
        iounmap(hcd->regs);

        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
        usb_put_hcd(hcd);

        ps3_io_irq_destroy(tmp);
        ps3_free_mmio_region(dev->m_region);

        ps3_dma_region_free(dev->d_region);
        ps3_close_hv_device(dev);

        return 0;
}

static int __init ps3_ehci_driver_register(struct ps3_system_bus_driver *drv)
{
        return firmware_has_feature(FW_FEATURE_PS3_LV1)
                ? ps3_system_bus_driver_register(drv)
                : 0;
}

static void ps3_ehci_driver_unregister(struct ps3_system_bus_driver *drv)
{
        if (firmware_has_feature(FW_FEATURE_PS3_LV1))
                ps3_system_bus_driver_unregister(drv);
}

MODULE_ALIAS(PS3_MODULE_ALIAS_EHCI);

static struct ps3_system_bus_driver ps3_ehci_driver = {
        .core.name = "ps3-ehci-driver",
        .core.owner = THIS_MODULE,
        .match_id = PS3_MATCH_ID_EHCI,
        .probe = ps3_ehci_probe,
        .remove = ps3_ehci_remove,
        .shutdown = ps3_ehci_remove,
};