73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
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/*
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* Copyright (C) 2014 Marvell
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* Author: Gregory CLEMENT <gregory.clement@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/mbus.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include "xhci-mvebu.h"
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#define USB3_MAX_WINDOWS 4
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#define USB3_WIN_CTRL(w) (0x0 + ((w) * 8))
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#define USB3_WIN_BASE(w) (0x4 + ((w) * 8))
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static void xhci_mvebu_mbus_config(void __iomem *base,
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const struct mbus_dram_target_info *dram)
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{
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int win;
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/* Clear all existing windows */
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for (win = 0; win < USB3_MAX_WINDOWS; win++) {
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writel(0, base + USB3_WIN_CTRL(win));
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writel(0, base + USB3_WIN_BASE(win));
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}
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/* Program each DRAM CS in a seperate window */
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for (win = 0; win < dram->num_cs; win++) {
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const struct mbus_dram_window *cs = dram->cs + win;
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writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
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(dram->mbus_dram_target_id << 4) | 1,
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base + USB3_WIN_CTRL(win));
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writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win));
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}
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}
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int xhci_mvebu_mbus_init_quirk(struct platform_device *pdev)
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{
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struct resource *res;
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void __iomem *base;
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const struct mbus_dram_target_info *dram;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!res)
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return -ENODEV;
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/*
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* We don't use devm_ioremap() because this mapping should
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* only exists for the duration of this probe function.
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*/
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base = ioremap(res->start, resource_size(res));
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if (!base)
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return -ENODEV;
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dram = mv_mbus_dram_info();
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xhci_mvebu_mbus_config(base, dram);
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/*
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* This memory area was only needed to configure the MBus
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* windows, and is therefore no longer useful.
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*/
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iounmap(base);
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return 0;
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}
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