xref: /openbmc/linux/drivers/pci/hotplug/pciehp.h (revision d2999e1b)
1 /*
2  * PCI Express Hot Plug Controller Driver
3  *
4  * Copyright (C) 1995,2001 Compaq Computer Corporation
5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6  * Copyright (C) 2001 IBM Corp.
7  * Copyright (C) 2003-2004 Intel Corporation
8  *
9  * All rights reserved.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or (at
14  * your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful, but
17  * WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19  * NON INFRINGEMENT.  See the GNU General Public License for more
20  * details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25  *
26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27  *
28  */
29 #ifndef _PCIEHP_H
30 #define _PCIEHP_H
31 
32 #include <linux/types.h>
33 #include <linux/pci.h>
34 #include <linux/pci_hotplug.h>
35 #include <linux/delay.h>
36 #include <linux/sched.h>		/* signal_pending() */
37 #include <linux/pcieport_if.h>
38 #include <linux/mutex.h>
39 #include <linux/workqueue.h>
40 
41 #define MY_NAME	"pciehp"
42 
43 extern bool pciehp_poll_mode;
44 extern int pciehp_poll_time;
45 extern bool pciehp_debug;
46 
47 #define dbg(format, arg...)						\
48 do {									\
49 	if (pciehp_debug)						\
50 		printk(KERN_DEBUG "%s: " format, MY_NAME , ## arg);	\
51 } while (0)
52 #define err(format, arg...)						\
53 	printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
54 #define info(format, arg...)						\
55 	printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
56 #define warn(format, arg...)						\
57 	printk(KERN_WARNING "%s: " format, MY_NAME , ## arg)
58 
59 #define ctrl_dbg(ctrl, format, arg...)					\
60 	do {								\
61 		if (pciehp_debug)					\
62 			dev_printk(KERN_DEBUG, &ctrl->pcie->device,	\
63 					format, ## arg);		\
64 	} while (0)
65 #define ctrl_err(ctrl, format, arg...)					\
66 	dev_err(&ctrl->pcie->device, format, ## arg)
67 #define ctrl_info(ctrl, format, arg...)					\
68 	dev_info(&ctrl->pcie->device, format, ## arg)
69 #define ctrl_warn(ctrl, format, arg...)					\
70 	dev_warn(&ctrl->pcie->device, format, ## arg)
71 
72 #define SLOT_NAME_SIZE 10
73 struct slot {
74 	u8 state;
75 	struct controller *ctrl;
76 	struct hotplug_slot *hotplug_slot;
77 	struct delayed_work work;	/* work for button event */
78 	struct mutex lock;
79 	struct mutex hotplug_lock;
80 	struct workqueue_struct *wq;
81 };
82 
83 struct event_info {
84 	u32 event_type;
85 	struct slot *p_slot;
86 	struct work_struct work;
87 };
88 
89 struct controller {
90 	struct mutex ctrl_lock;		/* controller lock */
91 	struct pcie_device *pcie;	/* PCI Express port service */
92 	struct slot *slot;
93 	wait_queue_head_t queue;	/* sleep & wake process */
94 	u32 slot_cap;
95 	struct timer_list poll_timer;
96 	unsigned int cmd_busy:1;
97 	unsigned int no_cmd_complete:1;
98 	unsigned int link_active_reporting:1;
99 	unsigned int notification_enabled:1;
100 	unsigned int power_fault_detected;
101 };
102 
103 #define INT_BUTTON_IGNORE		0
104 #define INT_PRESENCE_ON			1
105 #define INT_PRESENCE_OFF		2
106 #define INT_SWITCH_CLOSE		3
107 #define INT_SWITCH_OPEN			4
108 #define INT_POWER_FAULT			5
109 #define INT_POWER_FAULT_CLEAR		6
110 #define INT_BUTTON_PRESS		7
111 #define INT_BUTTON_RELEASE		8
112 #define INT_BUTTON_CANCEL		9
113 #define INT_LINK_UP			10
114 #define INT_LINK_DOWN			11
115 
116 #define STATIC_STATE			0
117 #define BLINKINGON_STATE		1
118 #define BLINKINGOFF_STATE		2
119 #define POWERON_STATE			3
120 #define POWEROFF_STATE			4
121 
122 #define ATTN_BUTTN(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_ABP)
123 #define POWER_CTRL(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_PCP)
124 #define MRL_SENS(ctrl)		((ctrl)->slot_cap & PCI_EXP_SLTCAP_MRLSP)
125 #define ATTN_LED(ctrl)		((ctrl)->slot_cap & PCI_EXP_SLTCAP_AIP)
126 #define PWR_LED(ctrl)		((ctrl)->slot_cap & PCI_EXP_SLTCAP_PIP)
127 #define HP_SUPR_RM(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_HPS)
128 #define EMI(ctrl)		((ctrl)->slot_cap & PCI_EXP_SLTCAP_EIP)
129 #define NO_CMD_CMPL(ctrl)	((ctrl)->slot_cap & PCI_EXP_SLTCAP_NCCS)
130 #define PSN(ctrl)		(((ctrl)->slot_cap & PCI_EXP_SLTCAP_PSN) >> 19)
131 
132 int pciehp_sysfs_enable_slot(struct slot *slot);
133 int pciehp_sysfs_disable_slot(struct slot *slot);
134 u8 pciehp_handle_attention_button(struct slot *p_slot);
135 u8 pciehp_handle_switch_change(struct slot *p_slot);
136 u8 pciehp_handle_presence_change(struct slot *p_slot);
137 u8 pciehp_handle_power_fault(struct slot *p_slot);
138 void pciehp_handle_linkstate_change(struct slot *p_slot);
139 int pciehp_configure_device(struct slot *p_slot);
140 int pciehp_unconfigure_device(struct slot *p_slot);
141 void pciehp_queue_pushbutton_work(struct work_struct *work);
142 struct controller *pcie_init(struct pcie_device *dev);
143 int pcie_init_notification(struct controller *ctrl);
144 int pciehp_enable_slot(struct slot *p_slot);
145 int pciehp_disable_slot(struct slot *p_slot);
146 void pcie_enable_notification(struct controller *ctrl);
147 int pciehp_power_on_slot(struct slot *slot);
148 void pciehp_power_off_slot(struct slot *slot);
149 void pciehp_get_power_status(struct slot *slot, u8 *status);
150 void pciehp_get_attention_status(struct slot *slot, u8 *status);
151 
152 void pciehp_set_attention_status(struct slot *slot, u8 status);
153 void pciehp_get_latch_status(struct slot *slot, u8 *status);
154 void pciehp_get_adapter_status(struct slot *slot, u8 *status);
155 int pciehp_query_power_fault(struct slot *slot);
156 void pciehp_green_led_on(struct slot *slot);
157 void pciehp_green_led_off(struct slot *slot);
158 void pciehp_green_led_blink(struct slot *slot);
159 int pciehp_check_link_status(struct controller *ctrl);
160 bool pciehp_check_link_active(struct controller *ctrl);
161 void pciehp_release_ctrl(struct controller *ctrl);
162 int pciehp_reset_slot(struct slot *slot, int probe);
163 
164 static inline const char *slot_name(struct slot *slot)
165 {
166 	return hotplug_slot_name(slot->hotplug_slot);
167 }
168 
169 #ifdef CONFIG_ACPI
170 #include <linux/pci-acpi.h>
171 
172 void __init pciehp_acpi_slot_detection_init(void);
173 int pciehp_acpi_slot_detection_check(struct pci_dev *dev);
174 
175 static inline void pciehp_firmware_init(void)
176 {
177 	pciehp_acpi_slot_detection_init();
178 }
179 #else
180 #define pciehp_firmware_init()				do {} while (0)
181 static inline int pciehp_acpi_slot_detection_check(struct pci_dev *dev)
182 {
183 	return 0;
184 }
185 #endif				/* CONFIG_ACPI */
186 #endif				/* _PCIEHP_H */
187