usb/host/xhci-mvebu.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (C) 2014 Marvell
0004  * Author: Gregory CLEMENT <gregory.clement@free-electrons.com>
0005  */
0006
0007 #include <linux/io.h>
0008 #include <linux/mbus.h>
0009 #include <linux/of.h>
0010 #include <linux/platform_device.h>
0011
0012 #include <linux/usb.h>
0013 #include <linux/usb/hcd.h>
0014
0015 #include "xhci-mvebu.h"
0016 #include "xhci.h"
0017
0018 #define USB3_MAX_WINDOWS    4
0019 #define USB3_WIN_CTRL(w)    (0x0 + ((w) * 8))
0020 #define USB3_WIN_BASE(w)    (0x4 + ((w) * 8))
0021
0022 static void xhci_mvebu_mbus_config(void __iomem *base,
0023             const struct mbus_dram_target_info *dram)
0024 {
0025     int win;
0026
0027     /* Clear all existing windows */
0028     for (win = 0; win < USB3_MAX_WINDOWS; win++) {
0029         writel(0, base + USB3_WIN_CTRL(win));
0030         writel(0, base + USB3_WIN_BASE(win));
0031     }
0032
0033     /* Program each DRAM CS in a seperate window */
0034     for (win = 0; win < dram->num_cs; win++) {
0035         const struct mbus_dram_window *cs = dram->cs + win;
0036
0037         writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
0038                (dram->mbus_dram_target_id << 4) | 1,
0039                base + USB3_WIN_CTRL(win));
0040
0041         writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win));
0042     }
0043 }
0044
0045 int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
0046 {
0047     struct device *dev = hcd->self.controller;
0048     struct platform_device *pdev = to_platform_device(dev);
0049     struct resource *res;
0050     void __iomem *base;
0051     const struct mbus_dram_target_info *dram;
0052
0053     res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
0054     if (!res)
0055         return -ENODEV;
0056
0057     /*
0058      * We don't use devm_ioremap() because this mapping should
0059      * only exists for the duration of this probe function.
0060      */
0061     base = ioremap(res->start, resource_size(res));
0062     if (!base)
0063         return -ENODEV;
0064
0065     dram = mv_mbus_dram_info();
0066     xhci_mvebu_mbus_config(base, dram);
0067
0068     /*
0069      * This memory area was only needed to configure the MBus
0070      * windows, and is therefore no longer useful.
0071      */
0072     iounmap(base);
0073
0074     return 0;
0075 }
0076
0077 int xhci_mvebu_a3700_init_quirk(struct usb_hcd *hcd)
0078 {
0079     struct xhci_hcd *xhci = hcd_to_xhci(hcd);
0080
0081     /* Without reset on resume, the HC won't work at all */
0082     xhci->quirks |= XHCI_RESET_ON_RESUME;
0083
0084     return 0;
0085 }