// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2014 Marvell
 * Author: Gregory CLEMENT <gregory.clement@free-electrons.com>
 */

#include <linux/io.h>
#include <linux/mbus.h>
#include <linux/of.h>
#include <linux/platform_device.h>

#include <linux/usb.h>
#include <linux/usb/hcd.h>

#include "xhci-mvebu.h"
#include "xhci.h"

#define USB3_MAX_WINDOWS        4
#define USB3_WIN_CTRL(w)        (0x0 + ((w) * 8))
#define USB3_WIN_BASE(w)        (0x4 + ((w) * 8))

static void xhci_mvebu_mbus_config(void __iomem *base,
                        const struct mbus_dram_target_info *dram)
{
        int win;

        /* Clear all existing windows */
        for (win = 0; win < USB3_MAX_WINDOWS; win++) {
                writel(0, base + USB3_WIN_CTRL(win));
                writel(0, base + USB3_WIN_BASE(win));
        }

        /* Program each DRAM CS in a seperate window */
        for (win = 0; win < dram->num_cs; win++) {
                const struct mbus_dram_window *cs = &dram->cs[win];

                writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
                       (dram->mbus_dram_target_id << 4) | 1,
                       base + USB3_WIN_CTRL(win));

                writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win));
        }
}

int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
{
        struct device *dev = hcd->self.controller;
        struct platform_device *pdev = to_platform_device(dev);
        struct resource *res;
        void __iomem *base;
        const struct mbus_dram_target_info *dram;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
        if (!res)
                return -ENODEV;

        /*
         * We don't use devm_ioremap() because this mapping should
         * only exists for the duration of this probe function.
         */
        base = ioremap(res->start, resource_size(res));
        if (!base)
                return -ENODEV;

        dram = mv_mbus_dram_info();
        xhci_mvebu_mbus_config(base, dram);

        /*
         * This memory area was only needed to configure the MBus
         * windows, and is therefore no longer useful.
         */
        iounmap(base);

        return 0;
}