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 #include <linux/phy/phy.h> 12 13 #include <linux/usb.h> 14 #include <linux/usb/hcd.h> 15 16 #include "xhci-mvebu.h" 17 #include "xhci.h" 18 19 #define USB3_MAX_WINDOWS 4 20 #define USB3_WIN_CTRL(w) (0x0 + ((w) * 8)) 21 #define USB3_WIN_BASE(w) (0x4 + ((w) * 8)) 22 23 static void xhci_mvebu_mbus_config(void __iomem *base, 24 const struct mbus_dram_target_info *dram) 25 { 26 int win; 27 28 /* Clear all existing windows */ 29 for (win = 0; win < USB3_MAX_WINDOWS; win++) { 30 writel(0, base + USB3_WIN_CTRL(win)); 31 writel(0, base + USB3_WIN_BASE(win)); 32 } 33 34 /* Program each DRAM CS in a seperate window */ 35 for (win = 0; win < dram->num_cs; win++) { 36 const struct mbus_dram_window *cs = dram->cs + win; 37 38 writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) | 39 (dram->mbus_dram_target_id << 4) | 1, 40 base + USB3_WIN_CTRL(win)); 41 42 writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win)); 43 } 44 } 45 46 int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd) 47 { 48 struct device *dev = hcd->self.controller; 49 struct platform_device *pdev = to_platform_device(dev); 50 struct resource *res; 51 void __iomem *base; 52 const struct mbus_dram_target_info *dram; 53 54 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 55 if (!res) 56 return -ENODEV; 57 58 /* 59 * We don't use devm_ioremap() because this mapping should 60 * only exists for the duration of this probe function. 61 */ 62 base = ioremap(res->start, resource_size(res)); 63 if (!base) 64 return -ENODEV; 65 66 dram = mv_mbus_dram_info(); 67 xhci_mvebu_mbus_config(base, dram); 68 69 /* 70 * This memory area was only needed to configure the MBus 71 * windows, and is therefore no longer useful. 72 */ 73 iounmap(base); 74 75 return 0; 76 } 77 78 int xhci_mvebu_a3700_plat_setup(struct usb_hcd *hcd) 79 { 80 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 81 struct device *dev = hcd->self.controller; 82 struct phy *phy; 83 int ret; 84 85 /* Old bindings miss the PHY handle */ 86 phy = of_phy_get(dev->of_node, "usb3-phy"); 87 if (IS_ERR(phy) && PTR_ERR(phy) == -EPROBE_DEFER) 88 return -EPROBE_DEFER; 89 else if (IS_ERR(phy)) 90 goto phy_out; 91 92 ret = phy_init(phy); 93 if (ret) 94 goto phy_put; 95 96 ret = phy_set_mode(phy, PHY_MODE_USB_HOST_SS); 97 if (ret) 98 goto phy_exit; 99 100 ret = phy_power_on(phy); 101 if (ret == -EOPNOTSUPP) { 102 /* Skip initializatin of XHCI PHY when it is unsupported by firmware */ 103 dev_warn(dev, "PHY unsupported by firmware\n"); 104 xhci->quirks |= XHCI_SKIP_PHY_INIT; 105 } 106 if (ret) 107 goto phy_exit; 108 109 phy_power_off(phy); 110 phy_exit: 111 phy_exit(phy); 112 phy_put: 113 of_phy_put(phy); 114 phy_out: 115 116 return 0; 117 } 118 119 int xhci_mvebu_a3700_init_quirk(struct usb_hcd *hcd) 120 { 121 struct xhci_hcd *xhci = hcd_to_xhci(hcd); 122 123 /* Without reset on resume, the HC won't work at all */ 124 xhci->quirks |= XHCI_RESET_ON_RESUME; 125 126 return 0; 127 } 128