Loading...
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 ms to halt an HC */
23#define XHCI_MAX_HALT_USEC (16*1000)
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 */
98static 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 ext_offset = 0;
108 } else {
109 /* Find the next extended capability */
110 next = XHCI_EXT_CAPS_NEXT(next);
111 }
112
113 if (!next)
114 return 0;
115 /*
116 * Address calculation from offset of extended capabilities
117 * (or HCCPARAMS) register - see section 5.3.6 and section 7.
118 */
119 return ext_offset + (next << 2);
120}
121
122/**
123 * Find the offset of the extended capabilities with capability ID id.
124 *
125 * @base PCI MMIO registers base address.
126 * @ext_offset Offset from base of the first extended capability to look at,
127 * or the address of HCCPARAMS.
128 * @id Extended capability ID to search for.
129 *
130 * This uses an arbitrary limit of XHCI_MAX_EXT_CAPS extended capabilities
131 * to make sure that the list doesn't contain a loop.
132 */
133static inline int xhci_find_ext_cap_by_id(void __iomem *base, int ext_offset, int id)
134{
135 u32 val;
136 int limit = XHCI_MAX_EXT_CAPS;
137
138 while (ext_offset && limit > 0) {
139 val = readl(base + ext_offset);
140 if (XHCI_EXT_CAPS_ID(val) == id)
141 break;
142 ext_offset = xhci_find_next_cap_offset(base, ext_offset);
143 limit--;
144 }
145 if (limit > 0)
146 return ext_offset;
147 return 0;
148}
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 ms to halt an HC */
23#define XHCI_MAX_HALT_USEC (16*1000)
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 1:3, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */
66#define XHCI_LEGACY_DISABLE_SMI ((0x7 << 1) + (0xff << 5) + (0x7 << 17))
67#define XHCI_LEGACY_SMI_EVENTS (0x7 << 29)
68
69/* USB 2.0 xHCI 0.96 L1C capability - section 7.2.2.1.3.2 */
70#define XHCI_L1C (1 << 16)
71
72/* USB 2.0 xHCI 1.0 hardware LMP capability - section 7.2.2.1.3.2 */
73#define XHCI_HLC (1 << 19)
74#define XHCI_BLC (1 << 20)
75
76/* command register values to disable interrupts and halt the HC */
77/* start/stop HC execution - do not write unless HC is halted*/
78#define XHCI_CMD_RUN (1 << 0)
79/* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */
80#define XHCI_CMD_EIE (1 << 2)
81/* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */
82#define XHCI_CMD_HSEIE (1 << 3)
83/* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
84#define XHCI_CMD_EWE (1 << 10)
85
86#define XHCI_IRQS (XHCI_CMD_EIE | XHCI_CMD_HSEIE | XHCI_CMD_EWE)
87
88/* true: Controller Not Ready to accept doorbell or op reg writes after reset */
89#define XHCI_STS_CNR (1 << 11)
90
91#include <linux/io.h>
92
93/**
94 * Find the offset of the extended capabilities with capability ID id.
95 *
96 * @base PCI MMIO registers base address.
97 * @start address at which to start looking, (0 or HCC_PARAMS to start at
98 * beginning of list)
99 * @id Extended capability ID to search for.
100 *
101 * Returns the offset of the next matching extended capability structure.
102 * Some capabilities can occur several times, e.g., the XHCI_EXT_CAPS_PROTOCOL,
103 * and this provides a way to find them all.
104 */
105
106static inline int xhci_find_next_ext_cap(void __iomem *base, u32 start, int id)
107{
108 u32 val;
109 u32 next;
110 u32 offset;
111
112 offset = start;
113 if (!start || start == XHCI_HCC_PARAMS_OFFSET) {
114 val = readl(base + XHCI_HCC_PARAMS_OFFSET);
115 if (val == ~0)
116 return 0;
117 offset = XHCI_HCC_EXT_CAPS(val) << 2;
118 if (!offset)
119 return 0;
120 };
121 do {
122 val = readl(base + offset);
123 if (val == ~0)
124 return 0;
125 if (XHCI_EXT_CAPS_ID(val) == id && offset != start)
126 return offset;
127
128 next = XHCI_EXT_CAPS_NEXT(val);
129 offset += next << 2;
130 } while (next);
131
132 return 0;
133}