1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2015, Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 * All rights reserved.
6 */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <dm/device_compat.h>
11 #include <init.h>
12 #include <log.h>
13 #include <pci.h>
14 #include <reset.h>
15 #include <usb.h>
16 #include <usb/xhci.h>
17
18 struct xhci_pci_plat {
19 struct reset_ctl reset;
20 };
21
xhci_pci_init(struct udevice * dev,struct xhci_hccr ** ret_hccr,struct xhci_hcor ** ret_hcor)22 static int xhci_pci_init(struct udevice *dev, struct xhci_hccr **ret_hccr,
23 struct xhci_hcor **ret_hcor)
24 {
25 struct xhci_hccr *hccr;
26 struct xhci_hcor *hcor;
27 u32 cmd;
28
29 hccr = (struct xhci_hccr *)dm_pci_map_bar(dev,
30 PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
31 if (!hccr) {
32 printf("xhci-pci init cannot map PCI mem bar\n");
33 return -EIO;
34 }
35
36 hcor = (struct xhci_hcor *)((uintptr_t) hccr +
37 HC_LENGTH(xhci_readl(&hccr->cr_capbase)));
38
39 debug("XHCI-PCI init hccr %p and hcor %p hc_length %d\n",
40 hccr, hcor, (u32)HC_LENGTH(xhci_readl(&hccr->cr_capbase)));
41
42 *ret_hccr = hccr;
43 *ret_hcor = hcor;
44
45 /* enable busmaster */
46 dm_pci_read_config32(dev, PCI_COMMAND, &cmd);
47 cmd |= PCI_COMMAND_MASTER;
48 dm_pci_write_config32(dev, PCI_COMMAND, cmd);
49 return 0;
50 }
51
xhci_pci_probe(struct udevice * dev)52 static int xhci_pci_probe(struct udevice *dev)
53 {
54 struct xhci_pci_plat *plat = dev_get_plat(dev);
55 struct xhci_hccr *hccr;
56 struct xhci_hcor *hcor;
57 int ret;
58
59 ret = reset_get_by_index(dev, 0, &plat->reset);
60 if (ret && ret != -ENOENT && ret != -ENOTSUPP) {
61 dev_err(dev, "failed to get reset\n");
62 return ret;
63 }
64
65 if (reset_valid(&plat->reset)) {
66 ret = reset_assert(&plat->reset);
67 if (ret)
68 goto err_reset;
69
70 ret = reset_deassert(&plat->reset);
71 if (ret)
72 goto err_reset;
73 }
74
75 ret = xhci_pci_init(dev, &hccr, &hcor);
76 if (ret)
77 goto err_reset;
78
79 ret = xhci_register(dev, hccr, hcor);
80 if (ret)
81 goto err_reset;
82
83 return 0;
84
85 err_reset:
86 if (reset_valid(&plat->reset))
87 reset_free(&plat->reset);
88
89 return ret;
90 }
91
xhci_pci_remove(struct udevice * dev)92 static int xhci_pci_remove(struct udevice *dev)
93 {
94 struct xhci_pci_plat *plat = dev_get_plat(dev);
95
96 xhci_deregister(dev);
97 if (reset_valid(&plat->reset))
98 reset_free(&plat->reset);
99
100 return 0;
101 }
102
103 static const struct udevice_id xhci_pci_ids[] = {
104 { .compatible = "xhci-pci" },
105 { }
106 };
107
108 U_BOOT_DRIVER(xhci_pci) = {
109 .name = "xhci_pci",
110 .id = UCLASS_USB,
111 .probe = xhci_pci_probe,
112 .remove = xhci_pci_remove,
113 .of_match = xhci_pci_ids,
114 .ops = &xhci_usb_ops,
115 .plat_auto = sizeof(struct xhci_pci_plat),
116 .priv_auto = sizeof(struct xhci_ctrl),
117 .flags = DM_FLAG_OS_PREPARE | DM_FLAG_ALLOC_PRIV_DMA,
118 };
119
120 static struct pci_device_id xhci_pci_supported[] = {
121 { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0) },
122 {},
123 };
124
125 U_BOOT_PCI_DEVICE(xhci_pci, xhci_pci_supported);
126