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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  * Return the next extended capability pointer register.
95  *
96  * @base	PCI register base address.
97  *
98  * @ext_offset	Offset of the 32-bit register that contains the extended
99  * capabilites pointer.  If searching for the first extended capability, pass
100  * in XHCI_HCC_PARAMS_OFFSET.  If searching for the next extended capability,
101  * pass in the offset of the current extended capability register.
102  *
103  * Returns 0 if there is no next extended capability register or returns the register offset
104  * from the PCI registers base address.
105  */
xhci_find_next_cap_offset(void __iomem * base,int ext_offset)106 static inline int xhci_find_next_cap_offset(void __iomem *base, int ext_offset)
107 {
108 	u32 next;
109 
110 	next = readl(base + ext_offset);
111 
112 	if (ext_offset == XHCI_HCC_PARAMS_OFFSET) {
113 		/* Find the first extended capability */
114 		next = XHCI_HCC_EXT_CAPS(next);
115 		ext_offset = 0;
116 	} else {
117 		/* Find the next extended capability */
118 		next = XHCI_EXT_CAPS_NEXT(next);
119 	}
120 
121 	if (!next)
122 		return 0;
123 	/*
124 	 * Address calculation from offset of extended capabilities
125 	 * (or HCCPARAMS) register - see section 5.3.6 and section 7.
126 	 */
127 	return ext_offset + (next << 2);
128 }
129 
130 /**
131  * Find the offset of the extended capabilities with capability ID id.
132  *
133  * @base PCI MMIO registers base address.
134  * @ext_offset Offset from base of the first extended capability to look at,
135  * 		or the address of HCCPARAMS.
136  * @id Extended capability ID to search for.
137  *
138  * This uses an arbitrary limit of XHCI_MAX_EXT_CAPS extended capabilities
139  * to make sure that the list doesn't contain a loop.
140  */
xhci_find_ext_cap_by_id(void __iomem * base,int ext_offset,int id)141 static inline int xhci_find_ext_cap_by_id(void __iomem *base, int ext_offset, int id)
142 {
143 	u32 val;
144 	int limit = XHCI_MAX_EXT_CAPS;
145 
146 	while (ext_offset && limit > 0) {
147 		val = readl(base + ext_offset);
148 		if (XHCI_EXT_CAPS_ID(val) == id)
149 			break;
150 		ext_offset = xhci_find_next_cap_offset(base, ext_offset);
151 		limit--;
152 	}
153 	if (limit > 0)
154 		return ext_offset;
155 	return 0;
156 }
157