1 /* 2 * Copyright (C) 2014 Marvell 3 * Author: Gregory CLEMENT <gregory.clement@free-electrons.com> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License 7 * version 2 as published by the Free Software Foundation. 8 */ 9 10 #include <linux/io.h> 11 #include <linux/mbus.h> 12 #include <linux/of.h> 13 #include <linux/platform_device.h> 14 15 #include <linux/usb.h> 16 #include <linux/usb/hcd.h> 17 18 #include "xhci-mvebu.h" 19 20 #define USB3_MAX_WINDOWS 4 21 #define USB3_WIN_CTRL(w) (0x0 + ((w) * 8)) 22 #define USB3_WIN_BASE(w) (0x4 + ((w) * 8)) 23 24 static void xhci_mvebu_mbus_config(void __iomem *base, 25 const struct mbus_dram_target_info *dram) 26 { 27 int win; 28 29 /* Clear all existing windows */ 30 for (win = 0; win < USB3_MAX_WINDOWS; win++) { 31 writel(0, base + USB3_WIN_CTRL(win)); 32 writel(0, base + USB3_WIN_BASE(win)); 33 } 34 35 /* Program each DRAM CS in a seperate window */ 36 for (win = 0; win < dram->num_cs; win++) { 37 const struct mbus_dram_window *cs = dram->cs + win; 38 39 writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) | 40 (dram->mbus_dram_target_id << 4) | 1, 41 base + USB3_WIN_CTRL(win)); 42 43 writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win)); 44 } 45 } 46 47 int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd) 48 { 49 struct device *dev = hcd->self.controller; 50 struct platform_device *pdev = to_platform_device(dev); 51 struct resource *res; 52 void __iomem *base; 53 const struct mbus_dram_target_info *dram; 54 55 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 56 if (!res) 57 return -ENODEV; 58 59 /* 60 * We don't use devm_ioremap() because this mapping should 61 * only exists for the duration of this probe function. 62 */ 63 base = ioremap(res->start, resource_size(res)); 64 if (!base) 65 return -ENODEV; 66 67 dram = mv_mbus_dram_info(); 68 xhci_mvebu_mbus_config(base, dram); 69 70 /* 71 * This memory area was only needed to configure the MBus 72 * windows, and is therefore no longer useful. 73 */ 74 iounmap(base); 75 76 return 0; 77 } 78