drivers/usb/host/xhci-mvebu.c

   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 #include "xhci.h"
  17
  18 #define USB3_MAX_WINDOWS        4
  19 #define USB3_WIN_CTRL(w)        (0x0 + ((w) * 8))
  20 #define USB3_WIN_BASE(w)        (0x4 + ((w) * 8))
  21
  22 static void xhci_mvebu_mbus_config(void __iomem *base,
  23                         const struct mbus_dram_target_info *dram)
  24 {
  25         int win;
  26
  27         /* Clear all existing windows */
  28         for (win = 0; win < USB3_MAX_WINDOWS; win++) {
  29                 writel(0, base + USB3_WIN_CTRL(win));
  30                 writel(0, base + USB3_WIN_BASE(win));
  31         }
  32
  33         /* Program each DRAM CS in a seperate window */
  34         for (win = 0; win < dram->num_cs; win++) {
  35                 const struct mbus_dram_window *cs = dram->cs + win;
  36
  37                 writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
  38                        (dram->mbus_dram_target_id << 4) | 1,
  39                        base + USB3_WIN_CTRL(win));
  40
  41                 writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win));
  42         }
  43 }
  44
  45 int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
  46 {
  47         struct device *dev = hcd->self.controller;
  48         struct platform_device *pdev = to_platform_device(dev);
  49         struct resource *res;
  50         void __iomem *base;
  51         const struct mbus_dram_target_info *dram;
  52
  53         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  54         if (!res)
  55                 return -ENODEV;
  56
  57         /*
  58          * We don't use devm_ioremap() because this mapping should
  59          * only exists for the duration of this probe function.
  60          */
  61         base = ioremap(res->start, resource_size(res));
  62         if (!base)
  63                 return -ENODEV;
  64
  65         dram = mv_mbus_dram_info();
  66         xhci_mvebu_mbus_config(base, dram);
  67
  68         /*
  69          * This memory area was only needed to configure the MBus
  70          * windows, and is therefore no longer useful.
  71          */
  72         iounmap(base);
  73
  74         return 0;
  75 }
  76
  77 int xhci_mvebu_a3700_init_quirk(struct usb_hcd *hcd)
  78 {
  79         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
  80
  81         /* Without reset on resume, the HC won't work at all */
  82         xhci->quirks |= XHCI_RESET_ON_RESUME;
  83
  84         return 0;
  85 }