1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * xHCI host controller driver
4 *
5 * Copyright (C) 2008 Intel Corp.
6 *
7 * Author: Sarah Sharp
8 * Some code borrowed from the Linux EHCI driver.
9 */
10
11/* HC should halt within 16 ms, but use 32 ms as some hosts take longer */
12#define XHCI_MAX_HALT_USEC (32 * 1000)
13/* HC not running - set to 1 when run/stop bit is cleared. */
14#define XHCI_STS_HALT (1<<0)
15
16/* HCCPARAMS offset from PCI base address */
17#define XHCI_HCC_PARAMS_OFFSET 0x10
18/* HCCPARAMS contains the first extended capability pointer */
19#define XHCI_HCC_EXT_CAPS(p) (((p)>>16)&0xffff)
20
21/* Command and Status registers offset from the Operational Registers address */
22#define XHCI_CMD_OFFSET 0x00
23#define XHCI_STS_OFFSET 0x04
24
25#define XHCI_MAX_EXT_CAPS 50
26
27/* Capability Register */
28/* bits 7:0 - how long is the Capabilities register */
29#define XHCI_HC_LENGTH(p) (((p)>>00)&0x00ff)
30
31/* Extended capability register fields */
32#define XHCI_EXT_CAPS_ID(p) (((p)>>0)&0xff)
33#define XHCI_EXT_CAPS_NEXT(p) (((p)>>8)&0xff)
34#define XHCI_EXT_CAPS_VAL(p) ((p)>>16)
35/* Extended capability IDs - ID 0 reserved */
36#define XHCI_EXT_CAPS_LEGACY 1
37#define XHCI_EXT_CAPS_PROTOCOL 2
38#define XHCI_EXT_CAPS_PM 3
39#define XHCI_EXT_CAPS_VIRT 4
40#define XHCI_EXT_CAPS_ROUTE 5
41/* IDs 6-9 reserved */
42#define XHCI_EXT_CAPS_DEBUG 10
43/* Vendor caps */
44#define XHCI_EXT_CAPS_VENDOR_INTEL 192
45#define XHCI_EXT_CAPS_INTEL_SPR_SHADOW 206
46/* USB Legacy Support Capability - section 7.1.1 */
47#define XHCI_HC_BIOS_OWNED (1 << 16)
48#define XHCI_HC_OS_OWNED (1 << 24)
49
50/* USB Legacy Support Capability - section 7.1.1 */
51/* Add this offset, plus the value of xECP in HCCPARAMS to the base address */
52#define XHCI_LEGACY_SUPPORT_OFFSET (0x00)
53
54/* USB Legacy Support Control and Status Register - section 7.1.2 */
55/* Add this offset, plus the value of xECP in HCCPARAMS to the base address */
56#define XHCI_LEGACY_CONTROL_OFFSET (0x04)
57/* bits 1:3, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */
58#define XHCI_LEGACY_DISABLE_SMI ((0x7 << 1) + (0xff << 5) + (0x7 << 17))
59#define XHCI_LEGACY_SMI_EVENTS (0x7 << 29)
60
61/* USB 2.0 xHCI 0.96 L1C capability - section 7.2.2.1.3.2 */
62#define XHCI_L1C (1 << 16)
63
64/* USB 2.0 xHCI 1.0 hardware LMP capability - section 7.2.2.1.3.2 */
65#define XHCI_HLC (1 << 19)
66#define XHCI_BLC (1 << 20)
67
68/* Intel SPR shadow capability */
69#define XHCI_INTEL_SPR_ESS_PORT_OFFSET 0x8ac4 /* SuperSpeed port control */
70#define XHCI_INTEL_SPR_TUNEN BIT(4) /* Tunnel mode enabled */
71
72/* command register values to disable interrupts and halt the HC */
73/* start/stop HC execution - do not write unless HC is halted*/
74#define XHCI_CMD_RUN (1 << 0)
75/* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */
76#define XHCI_CMD_EIE (1 << 2)
77/* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */
78#define XHCI_CMD_HSEIE (1 << 3)
79/* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
80#define XHCI_CMD_EWE (1 << 10)
81
82#define XHCI_IRQS (XHCI_CMD_EIE | XHCI_CMD_HSEIE | XHCI_CMD_EWE)
83
84/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
85#define XHCI_STS_CNR (1 << 11)
86
87/**
88 * struct xhci_protocol_caps
89 * @revision: major revision, minor revision, capability ID,
90 * and next capability pointer.
91 * @name_string: Four ASCII characters to say which spec this xHC
92 * follows, typically "USB ".
93 * @port_info: Port offset, count, and protocol-defined information.
94 */
95struct xhci_protocol_caps {
96 u32 revision;
97 u32 name_string;
98 u32 port_info;
99};
100
101#define XHCI_EXT_PORT_MAJOR(x) (((x) >> 24) & 0xff)
102#define XHCI_EXT_PORT_MINOR(x) (((x) >> 16) & 0xff)
103#define XHCI_EXT_PORT_PSIC(x) (((x) >> 28) & 0x0f)
104#define XHCI_EXT_PORT_OFF(x) ((x) & 0xff)
105#define XHCI_EXT_PORT_COUNT(x) (((x) >> 8) & 0xff)
106
107#define XHCI_EXT_PORT_PSIV(x) (((x) >> 0) & 0x0f)
108#define XHCI_EXT_PORT_PSIE(x) (((x) >> 4) & 0x03)
109#define XHCI_EXT_PORT_PLT(x) (((x) >> 6) & 0x03)
110#define XHCI_EXT_PORT_PFD(x) (((x) >> 8) & 0x01)
111#define XHCI_EXT_PORT_LP(x) (((x) >> 14) & 0x03)
112#define XHCI_EXT_PORT_PSIM(x) (((x) >> 16) & 0xffff)
113
114#include <linux/io.h>
115
116/**
117 * Find the offset of the extended capabilities with capability ID id.
118 *
119 * @base PCI MMIO registers base address.
120 * @start address at which to start looking, (0 or HCC_PARAMS to start at
121 * beginning of list)
122 * @id Extended capability ID to search for, or 0 for the next
123 * capability
124 *
125 * Returns the offset of the next matching extended capability structure.
126 * Some capabilities can occur several times, e.g., the XHCI_EXT_CAPS_PROTOCOL,
127 * and this provides a way to find them all.
128 */
129
130static inline int xhci_find_next_ext_cap(void __iomem *base, u32 start, int id)
131{
132 u32 val;
133 u32 next;
134 u32 offset;
135
136 offset = start;
137 if (!start || start == XHCI_HCC_PARAMS_OFFSET) {
138 val = readl(addr: base + XHCI_HCC_PARAMS_OFFSET);
139 if (val == ~0)
140 return 0;
141 offset = XHCI_HCC_EXT_CAPS(val) << 2;
142 if (!offset)
143 return 0;
144 }
145 do {
146 val = readl(addr: base + offset);
147 if (val == ~0)
148 return 0;
149 if (offset != start && (id == 0 || XHCI_EXT_CAPS_ID(val) == id))
150 return offset;
151
152 next = XHCI_EXT_CAPS_NEXT(val);
153 offset += next << 2;
154 } while (next);
155
156 return 0;
157}
158

source code of linux/drivers/usb/host/xhci-ext-caps.h