1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2014 Marvell 4 * Author: Gregory CLEMENT <gregory.clement@free-electrons.com> 5 */ 6 7 #include <linux/io.h> 8 #include <linux/mbus.h> 9 #include <linux/of.h> 10 #include <linux/platform_device.h> 11 12 #include <linux/usb.h> 13 #include <linux/usb/hcd.h> 14 15 #include "xhci-mvebu.h" 16 17 #define USB3_MAX_WINDOWS 4 18 #define USB3_WIN_CTRL(w) (0x0 + ((w) * 8)) 19 #define USB3_WIN_BASE(w) (0x4 + ((w) * 8)) 20 21 static void xhci_mvebu_mbus_config(void __iomem *base, 22 const struct mbus_dram_target_info *dram) 23 { 24 int win; 25 26 /* Clear all existing windows */ 27 for (win = 0; win < USB3_MAX_WINDOWS; win++) { 28 writel(0, base + USB3_WIN_CTRL(win)); 29 writel(0, base + USB3_WIN_BASE(win)); 30 } 31 32 /* Program each DRAM CS in a seperate window */ 33 for (win = 0; win < dram->num_cs; win++) { 34 const struct mbus_dram_window *cs = dram->cs + win; 35 36 writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) | 37 (dram->mbus_dram_target_id << 4) | 1, 38 base + USB3_WIN_CTRL(win)); 39 40 writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win)); 41 } 42 } 43 44 int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd) 45 { 46 struct device *dev = hcd->self.controller; 47 struct platform_device *pdev = to_platform_device(dev); 48 struct resource *res; 49 void __iomem *base; 50 const struct mbus_dram_target_info *dram; 51 52 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 53 if (!res) 54 return -ENODEV; 55 56 /* 57 * We don't use devm_ioremap() because this mapping should 58 * only exists for the duration of this probe function. 59 */ 60 base = ioremap(res->start, resource_size(res)); 61 if (!base) 62 return -ENODEV; 63 64 dram = mv_mbus_dram_info(); 65 xhci_mvebu_mbus_config(base, dram); 66 67 /* 68 * This memory area was only needed to configure the MBus 69 * windows, and is therefore no longer useful. 70 */ 71 iounmap(base); 72 73 return 0; 74 } 75