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74c68741 SS |
1 | /* |
2 | * xHCI host controller driver | |
3 | * | |
4 | * Copyright (C) 2008 Intel Corp. | |
5 | * | |
6 | * Author: Sarah Sharp | |
7 | * Some code borrowed from the Linux EHCI driver. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
15 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | * for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software Foundation, | |
20 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | /* Up to 16 microframes to halt an HC - one microframe is 125 microsectonds */ | |
23 | #define XHCI_MAX_HALT_USEC (16*125) | |
24 | /* HC not running - set to 1 when run/stop bit is cleared. */ | |
25 | #define XHCI_STS_HALT (1<<0) | |
26 | ||
27 | /* HCCPARAMS offset from PCI base address */ | |
28 | #define XHCI_HCC_PARAMS_OFFSET 0x10 | |
29 | /* HCCPARAMS contains the first extended capability pointer */ | |
30 | #define XHCI_HCC_EXT_CAPS(p) (((p)>>16)&0xffff) | |
31 | ||
32 | /* Command and Status registers offset from the Operational Registers address */ | |
33 | #define XHCI_CMD_OFFSET 0x00 | |
34 | #define XHCI_STS_OFFSET 0x04 | |
35 | ||
36 | #define XHCI_MAX_EXT_CAPS 50 | |
37 | ||
38 | /* Capability Register */ | |
39 | /* bits 7:0 - how long is the Capabilities register */ | |
40 | #define XHCI_HC_LENGTH(p) (((p)>>00)&0x00ff) | |
41 | ||
42 | /* Extended capability register fields */ | |
43 | #define XHCI_EXT_CAPS_ID(p) (((p)>>0)&0xff) | |
44 | #define XHCI_EXT_CAPS_NEXT(p) (((p)>>8)&0xff) | |
45 | #define XHCI_EXT_CAPS_VAL(p) ((p)>>16) | |
46 | /* Extended capability IDs - ID 0 reserved */ | |
47 | #define XHCI_EXT_CAPS_LEGACY 1 | |
48 | #define XHCI_EXT_CAPS_PROTOCOL 2 | |
49 | #define XHCI_EXT_CAPS_PM 3 | |
50 | #define XHCI_EXT_CAPS_VIRT 4 | |
51 | #define XHCI_EXT_CAPS_ROUTE 5 | |
52 | /* IDs 6-9 reserved */ | |
53 | #define XHCI_EXT_CAPS_DEBUG 10 | |
54 | /* USB Legacy Support Capability - section 7.1.1 */ | |
55 | #define XHCI_HC_BIOS_OWNED (1 << 16) | |
56 | #define XHCI_HC_OS_OWNED (1 << 24) | |
57 | ||
58 | /* USB Legacy Support Capability - section 7.1.1 */ | |
59 | /* Add this offset, plus the value of xECP in HCCPARAMS to the base address */ | |
60 | #define XHCI_LEGACY_SUPPORT_OFFSET (0x00) | |
61 | ||
62 | /* USB Legacy Support Control and Status Register - section 7.1.2 */ | |
63 | /* Add this offset, plus the value of xECP in HCCPARAMS to the base address */ | |
64 | #define XHCI_LEGACY_CONTROL_OFFSET (0x04) | |
65 | /* bits 1:2, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */ | |
66 | #define XHCI_LEGACY_DISABLE_SMI ((0x3 << 1) + (0xff << 5) + (0x7 << 17)) | |
67 | ||
68 | /* command register values to disable interrupts and halt the HC */ | |
69 | /* start/stop HC execution - do not write unless HC is halted*/ | |
70 | #define XHCI_CMD_RUN (1 << 0) | |
71 | /* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */ | |
72 | #define XHCI_CMD_EIE (1 << 2) | |
73 | /* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */ | |
74 | #define XHCI_CMD_HSEIE (1 << 3) | |
75 | /* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */ | |
76 | #define XHCI_CMD_EWE (1 << 10) | |
77 | ||
78 | #define XHCI_IRQS (XHCI_CMD_EIE | XHCI_CMD_HSEIE | XHCI_CMD_EWE) | |
79 | ||
80 | /* true: Controller Not Ready to accept doorbell or op reg writes after reset */ | |
81 | #define XHCI_STS_CNR (1 << 11) | |
82 | ||
83 | #include <linux/io.h> | |
84 | ||
85 | /** | |
86 | * Return the next extended capability pointer register. | |
87 | * | |
88 | * @base PCI register base address. | |
89 | * | |
90 | * @ext_offset Offset of the 32-bit register that contains the extended | |
91 | * capabilites pointer. If searching for the first extended capability, pass | |
92 | * in XHCI_HCC_PARAMS_OFFSET. If searching for the next extended capability, | |
93 | * pass in the offset of the current extended capability register. | |
94 | * | |
95 | * Returns 0 if there is no next extended capability register or returns the register offset | |
96 | * from the PCI registers base address. | |
97 | */ | |
98 | static inline int xhci_find_next_cap_offset(void __iomem *base, int ext_offset) | |
99 | { | |
100 | u32 next; | |
101 | ||
102 | next = readl(base + ext_offset); | |
103 | ||
104 | if (ext_offset == XHCI_HCC_PARAMS_OFFSET) | |
105 | /* Find the first extended capability */ | |
106 | next = XHCI_HCC_EXT_CAPS(next); | |
107 | else | |
108 | /* Find the next extended capability */ | |
109 | next = XHCI_EXT_CAPS_NEXT(next); | |
110 | if (!next) | |
111 | return 0; | |
112 | /* | |
113 | * Address calculation from offset of extended capabilities | |
114 | * (or HCCPARAMS) register - see section 5.3.6 and section 7. | |
115 | */ | |
116 | return ext_offset + (next << 2); | |
117 | } | |
118 | ||
119 | /** | |
120 | * Find the offset of the extended capabilities with capability ID id. | |
121 | * | |
122 | * @base PCI MMIO registers base address. | |
123 | * @ext_offset Offset from base of the first extended capability to look at, | |
124 | * or the address of HCCPARAMS. | |
125 | * @id Extended capability ID to search for. | |
126 | * | |
127 | * This uses an arbitrary limit of XHCI_MAX_EXT_CAPS extended capabilities | |
128 | * to make sure that the list doesn't contain a loop. | |
129 | */ | |
130 | static inline int xhci_find_ext_cap_by_id(void __iomem *base, int ext_offset, int id) | |
131 | { | |
132 | u32 val; | |
133 | int limit = XHCI_MAX_EXT_CAPS; | |
134 | ||
135 | while (ext_offset && limit > 0) { | |
136 | val = readl(base + ext_offset); | |
137 | if (XHCI_EXT_CAPS_ID(val) == id) | |
138 | break; | |
139 | ext_offset = xhci_find_next_cap_offset(base, ext_offset); | |
140 | limit--; | |
141 | } | |
142 | if (limit > 0) | |
143 | return ext_offset; | |
144 | return 0; | |
145 | } |