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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2
3/*
4 * IBM ASM Service Processor Device Driver
5 *
6 * Copyright (C) IBM Corporation, 2004
7 *
8 * Author: Max Asböck <amax@us.ibm.com>
9 */
10
11#include <linux/kernel.h>
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/list.h>
15#include <linux/wait.h>
16#include <linux/spinlock.h>
17#include <linux/slab.h>
18#include <linux/module.h>
19#include <linux/interrupt.h>
20#include <linux/kref.h>
21#include <linux/device.h>
22#include <linux/input.h>
23#include <linux/time64.h>
24
25/* Driver identification */
26#define DRIVER_NAME "ibmasm"
27#define DRIVER_VERSION "1.0"
28#define DRIVER_AUTHOR "Max Asbock <masbock@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
29#define DRIVER_DESC "IBM ASM Service Processor Driver"
30
31#define err(msg) printk(KERN_ERR "%s: " msg "\n", DRIVER_NAME)
32#define info(msg) printk(KERN_INFO "%s: " msg "\n", DRIVER_NAME)
33
34extern int ibmasm_debug;
35#define dbg(STR, ARGS...) \
36 do { \
37 if (ibmasm_debug) \
38 printk(KERN_DEBUG STR , ##ARGS); \
39 } while (0)
40
41static inline char *get_timestamp(char *buf)
42{
43 struct timespec64 now;
44
45 ktime_get_real_ts64(&now);
46 sprintf(buf, "%llu.%.08lu", (long long)now.tv_sec,
47 now.tv_nsec / NSEC_PER_USEC);
48 return buf;
49}
50
51#define IBMASM_CMD_PENDING 0
52#define IBMASM_CMD_COMPLETE 1
53#define IBMASM_CMD_FAILED 2
54
55#define IBMASM_CMD_TIMEOUT_NORMAL 45
56#define IBMASM_CMD_TIMEOUT_EXTRA 240
57
58#define IBMASM_CMD_MAX_BUFFER_SIZE 0x8000
59
60#define REVERSE_HEARTBEAT_TIMEOUT 120
61
62#define HEARTBEAT_BUFFER_SIZE 0x400
63
64#ifdef IA64
65#define IBMASM_DRIVER_VPD "Lin64 6.08 "
66#else
67#define IBMASM_DRIVER_VPD "Lin32 6.08 "
68#endif
69
70#define SYSTEM_STATE_OS_UP 5
71#define SYSTEM_STATE_OS_DOWN 4
72
73#define IBMASM_NAME_SIZE 16
74
75#define IBMASM_NUM_EVENTS 10
76#define IBMASM_EVENT_MAX_SIZE 2048u
77
78
79struct command {
80 struct list_head queue_node;
81 wait_queue_head_t wait;
82 unsigned char *buffer;
83 size_t buffer_size;
84 int status;
85 struct kref kref;
86 spinlock_t *lock;
87};
88#define to_command(c) container_of(c, struct command, kref)
89
90void ibmasm_free_command(struct kref *kref);
91static inline void command_put(struct command *cmd)
92{
93 unsigned long flags;
94 spinlock_t *lock = cmd->lock;
95
96 spin_lock_irqsave(lock, flags);
97 kref_put(&cmd->kref, ibmasm_free_command);
98 spin_unlock_irqrestore(lock, flags);
99}
100
101static inline void command_get(struct command *cmd)
102{
103 kref_get(&cmd->kref);
104}
105
106
107struct ibmasm_event {
108 unsigned int serial_number;
109 unsigned int data_size;
110 unsigned char data[IBMASM_EVENT_MAX_SIZE];
111};
112
113struct event_buffer {
114 struct ibmasm_event events[IBMASM_NUM_EVENTS];
115 unsigned int next_serial_number;
116 unsigned int next_index;
117 struct list_head readers;
118};
119
120struct event_reader {
121 int cancelled;
122 unsigned int next_serial_number;
123 wait_queue_head_t wait;
124 struct list_head node;
125 unsigned int data_size;
126 unsigned char data[IBMASM_EVENT_MAX_SIZE];
127};
128
129struct reverse_heartbeat {
130 wait_queue_head_t wait;
131 unsigned int stopped;
132};
133
134struct ibmasm_remote {
135 struct input_dev *keybd_dev;
136 struct input_dev *mouse_dev;
137};
138
139struct service_processor {
140 struct list_head node;
141 spinlock_t lock;
142 void __iomem *base_address;
143 unsigned int irq;
144 struct command *current_command;
145 struct command *heartbeat;
146 struct list_head command_queue;
147 struct event_buffer *event_buffer;
148 char dirname[IBMASM_NAME_SIZE];
149 char devname[IBMASM_NAME_SIZE];
150 unsigned int number;
151 struct ibmasm_remote remote;
152 int serial_line;
153 struct device *dev;
154};
155
156/* command processing */
157struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_size);
158void ibmasm_exec_command(struct service_processor *sp, struct command *cmd);
159void ibmasm_wait_for_response(struct command *cmd, int timeout);
160void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size);
161
162/* event processing */
163int ibmasm_event_buffer_init(struct service_processor *sp);
164void ibmasm_event_buffer_exit(struct service_processor *sp);
165void ibmasm_receive_event(struct service_processor *sp, void *data, unsigned int data_size);
166void ibmasm_event_reader_register(struct service_processor *sp, struct event_reader *reader);
167void ibmasm_event_reader_unregister(struct service_processor *sp, struct event_reader *reader);
168int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *reader);
169void ibmasm_cancel_next_event(struct event_reader *reader);
170
171/* heartbeat - from SP to OS */
172void ibmasm_register_panic_notifier(void);
173void ibmasm_unregister_panic_notifier(void);
174int ibmasm_heartbeat_init(struct service_processor *sp);
175void ibmasm_heartbeat_exit(struct service_processor *sp);
176void ibmasm_receive_heartbeat(struct service_processor *sp, void *message, size_t size);
177
178/* reverse heartbeat - from OS to SP */
179void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
180int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
181void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb);
182
183/* dot commands */
184void ibmasm_receive_message(struct service_processor *sp, void *data, int data_size);
185int ibmasm_send_driver_vpd(struct service_processor *sp);
186int ibmasm_send_os_state(struct service_processor *sp, int os_state);
187
188/* low level message processing */
189int ibmasm_send_i2o_message(struct service_processor *sp);
190irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id);
191
192/* remote console */
193void ibmasm_handle_mouse_interrupt(struct service_processor *sp);
194int ibmasm_init_remote_input_dev(struct service_processor *sp);
195void ibmasm_free_remote_input_dev(struct service_processor *sp);
196
197/* file system */
198int ibmasmfs_register(void);
199void ibmasmfs_unregister(void);
200void ibmasmfs_add_sp(struct service_processor *sp);
201
202/* uart */
203#if IS_ENABLED(CONFIG_SERIAL_8250)
204void ibmasm_register_uart(struct service_processor *sp);
205void ibmasm_unregister_uart(struct service_processor *sp);
206#else
207#define ibmasm_register_uart(sp) do { } while(0)
208#define ibmasm_unregister_uart(sp) do { } while(0)
209#endif
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2
3/*
4 * IBM ASM Service Processor Device Driver
5 *
6 * Copyright (C) IBM Corporation, 2004
7 *
8 * Author: Max Asböck <amax@us.ibm.com>
9 */
10
11#include <linux/kernel.h>
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/list.h>
15#include <linux/wait.h>
16#include <linux/spinlock.h>
17#include <linux/slab.h>
18#include <linux/module.h>
19#include <linux/interrupt.h>
20#include <linux/kref.h>
21#include <linux/device.h>
22#include <linux/input.h>
23#include <linux/time64.h>
24
25/* Driver identification */
26#define DRIVER_NAME "ibmasm"
27#define DRIVER_VERSION "1.0"
28#define DRIVER_AUTHOR "Max Asbock <masbock@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
29#define DRIVER_DESC "IBM ASM Service Processor Driver"
30
31#define err(msg) printk(KERN_ERR "%s: " msg "\n", DRIVER_NAME)
32#define info(msg) printk(KERN_INFO "%s: " msg "\n", DRIVER_NAME)
33
34extern int ibmasm_debug;
35#define dbg(STR, ARGS...) \
36 do { \
37 if (ibmasm_debug) \
38 printk(KERN_DEBUG STR , ##ARGS); \
39 } while (0)
40
41static inline char *get_timestamp(char *buf)
42{
43 struct timespec64 now;
44
45 ktime_get_real_ts64(&now);
46 sprintf(buf, "%llu.%.08lu", (long long)now.tv_sec,
47 now.tv_nsec / NSEC_PER_USEC);
48 return buf;
49}
50
51#define IBMASM_CMD_PENDING 0
52#define IBMASM_CMD_COMPLETE 1
53#define IBMASM_CMD_FAILED 2
54
55#define IBMASM_CMD_TIMEOUT_NORMAL 45
56#define IBMASM_CMD_TIMEOUT_EXTRA 240
57
58#define IBMASM_CMD_MAX_BUFFER_SIZE 0x8000
59
60#define REVERSE_HEARTBEAT_TIMEOUT 120
61
62#define HEARTBEAT_BUFFER_SIZE 0x400
63
64#ifdef IA64
65#define IBMASM_DRIVER_VPD "Lin64 6.08 "
66#else
67#define IBMASM_DRIVER_VPD "Lin32 6.08 "
68#endif
69
70#define SYSTEM_STATE_OS_UP 5
71#define SYSTEM_STATE_OS_DOWN 4
72
73#define IBMASM_NAME_SIZE 16
74
75#define IBMASM_NUM_EVENTS 10
76#define IBMASM_EVENT_MAX_SIZE 2048u
77
78
79struct command {
80 struct list_head queue_node;
81 wait_queue_head_t wait;
82 unsigned char *buffer;
83 size_t buffer_size;
84 int status;
85 struct kref kref;
86 spinlock_t *lock;
87};
88#define to_command(c) container_of(c, struct command, kref)
89
90void ibmasm_free_command(struct kref *kref);
91static inline void command_put(struct command *cmd)
92{
93 unsigned long flags;
94 spinlock_t *lock = cmd->lock;
95
96 spin_lock_irqsave(lock, flags);
97 kref_put(&cmd->kref, ibmasm_free_command);
98 spin_unlock_irqrestore(lock, flags);
99}
100
101static inline void command_get(struct command *cmd)
102{
103 kref_get(&cmd->kref);
104}
105
106
107struct ibmasm_event {
108 unsigned int serial_number;
109 unsigned int data_size;
110 unsigned char data[IBMASM_EVENT_MAX_SIZE];
111};
112
113struct event_buffer {
114 struct ibmasm_event events[IBMASM_NUM_EVENTS];
115 unsigned int next_serial_number;
116 unsigned int next_index;
117 struct list_head readers;
118};
119
120struct event_reader {
121 int cancelled;
122 unsigned int next_serial_number;
123 wait_queue_head_t wait;
124 struct list_head node;
125 unsigned int data_size;
126 unsigned char data[IBMASM_EVENT_MAX_SIZE];
127};
128
129struct reverse_heartbeat {
130 wait_queue_head_t wait;
131 unsigned int stopped;
132};
133
134struct ibmasm_remote {
135 struct input_dev *keybd_dev;
136 struct input_dev *mouse_dev;
137};
138
139struct service_processor {
140 struct list_head node;
141 spinlock_t lock;
142 void __iomem *base_address;
143 unsigned int irq;
144 struct command *current_command;
145 struct command *heartbeat;
146 struct list_head command_queue;
147 struct event_buffer *event_buffer;
148 char dirname[IBMASM_NAME_SIZE];
149 char devname[IBMASM_NAME_SIZE];
150 unsigned int number;
151 struct ibmasm_remote remote;
152 int serial_line;
153 struct device *dev;
154};
155
156/* command processing */
157struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_size);
158void ibmasm_exec_command(struct service_processor *sp, struct command *cmd);
159void ibmasm_wait_for_response(struct command *cmd, int timeout);
160void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size);
161
162/* event processing */
163int ibmasm_event_buffer_init(struct service_processor *sp);
164void ibmasm_event_buffer_exit(struct service_processor *sp);
165void ibmasm_receive_event(struct service_processor *sp, void *data, unsigned int data_size);
166void ibmasm_event_reader_register(struct service_processor *sp, struct event_reader *reader);
167void ibmasm_event_reader_unregister(struct service_processor *sp, struct event_reader *reader);
168int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *reader);
169void ibmasm_cancel_next_event(struct event_reader *reader);
170
171/* heartbeat - from SP to OS */
172void ibmasm_register_panic_notifier(void);
173void ibmasm_unregister_panic_notifier(void);
174int ibmasm_heartbeat_init(struct service_processor *sp);
175void ibmasm_heartbeat_exit(struct service_processor *sp);
176void ibmasm_receive_heartbeat(struct service_processor *sp, void *message, size_t size);
177
178/* reverse heartbeat - from OS to SP */
179void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
180int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
181void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb);
182
183/* dot commands */
184void ibmasm_receive_message(struct service_processor *sp, void *data, int data_size);
185int ibmasm_send_driver_vpd(struct service_processor *sp);
186int ibmasm_send_os_state(struct service_processor *sp, int os_state);
187
188/* low level message processing */
189int ibmasm_send_i2o_message(struct service_processor *sp);
190irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id);
191
192/* remote console */
193void ibmasm_handle_mouse_interrupt(struct service_processor *sp);
194int ibmasm_init_remote_input_dev(struct service_processor *sp);
195void ibmasm_free_remote_input_dev(struct service_processor *sp);
196
197/* file system */
198int ibmasmfs_register(void);
199void ibmasmfs_unregister(void);
200void ibmasmfs_add_sp(struct service_processor *sp);
201
202/* uart */
203#if IS_ENABLED(CONFIG_SERIAL_8250)
204void ibmasm_register_uart(struct service_processor *sp);
205void ibmasm_unregister_uart(struct service_processor *sp);
206#else
207#define ibmasm_register_uart(sp) do { } while(0)
208#define ibmasm_unregister_uart(sp) do { } while(0)
209#endif