// 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" #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; }