summaryrefslogtreecommitdiffstats
path: root/include/asm-powerpc/pmac_pfunc.h
blob: d9728c80f86de3d4f4a1a3ca61ce6d0598fc089a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
#ifndef __PMAC_PFUNC_H__
#define __PMAC_PFUNC_H__

#include <linux/types.h>
#include <linux/list.h>

/* Flags in command lists */
#define PMF_FLAGS_ON_INIT		0x80000000u
#define PMF_FLGAS_ON_TERM		0x40000000u
#define PMF_FLAGS_ON_SLEEP		0x20000000u
#define PMF_FLAGS_ON_WAKE		0x10000000u
#define PMF_FLAGS_ON_DEMAND		0x08000000u
#define PMF_FLAGS_INT_GEN		0x04000000u
#define PMF_FLAGS_HIGH_SPEED		0x02000000u
#define PMF_FLAGS_LOW_SPEED		0x01000000u
#define PMF_FLAGS_SIDE_EFFECTS		0x00800000u

/*
 * Arguments to a platform function call.
 *
 * NOTE: By convention, pointer arguments point to an u32
 */
struct pmf_args {
	union {
		u32 v;
		u32 *p;
	} u[4];
	unsigned int count;
};

/*
 * A driver capable of interpreting commands provides a handlers
 * structure filled with whatever handlers are implemented by this
 * driver. Non implemented handlers are left NULL.
 *
 * PMF_STD_ARGS are the same arguments that are passed to the parser
 * and that gets passed back to the various handlers.
 *
 * Interpreting a given function always start with a begin() call which
 * returns an instance data to be passed around subsequent calls, and
 * ends with an end() call. This allows the low level driver to implement
 * locking policy or per-function instance data.
 *
 * For interrupt capable functions, irq_enable() is called when a client
 * registers, and irq_disable() is called when the last client unregisters
 * Note that irq_enable & irq_disable are called within a semaphore held
 * by the core, thus you should not try to register yourself to some other
 * pmf interrupt during those calls.
 */

#define PMF_STD_ARGS	struct pmf_function *func, void *instdata, \
		        struct pmf_args *args

struct pmf_function;

struct pmf_handlers {
	void * (*begin)(struct pmf_function *func, struct pmf_args *args);
	void (*end)(struct pmf_function *func, void *instdata);

	int (*irq_enable)(struct pmf_function *func);
	int (*irq_disable)(struct pmf_function *func);

	int (*write_gpio)(PMF_STD_ARGS, u8 value, u8 mask);
	int (*read_gpio)(PMF_STD_ARGS, u8 mask, int rshift, u8 xor);

	int (*write_reg32)(PMF_STD_ARGS, u32 offset, u32 value, u32 mask);
	int (*read_reg32)(PMF_STD_ARGS, u32 offset);
	int (*write_reg16)(PMF_STD_ARGS, u32 offset, u16 value, u16 mask);
	int (*read_reg16)(PMF_STD_ARGS, u32 offset);
	int (*write_reg8)(PMF_STD_ARGS, u32 offset, u8 value, u8 mask);
	int (*read_reg8)(PMF_STD_ARGS, u32 offset);

	int (*delay)(PMF_STD_ARGS, u32 duration);

	int (*wait_reg32)(PMF_STD_ARGS, u32 offset, u32 value, u32 mask);
	int (*wait_reg16)(PMF_STD_ARGS, u32 offset, u16 value, u16 mask);
	int (*wait_reg8)(PMF_STD_ARGS, u32 offset, u8 value, u8 mask);

	int (*read_i2c)(PMF_STD_ARGS, u32 len);
	int (*write_i2c)(PMF_STD_ARGS, u32 len, const u8 *data);
	int (*rmw_i2c)(PMF_STD_ARGS, u32 masklen, u32 valuelen, u32 totallen,
		       const u8 *maskdata, const u8 *valuedata);

	int (*read_cfg)(PMF_STD_ARGS, u32 offset, u32 len);
	int (*write_cfg)(PMF_STD_ARGS, u32 offset, u32 len, const u8 *data);
	int (*rmw_cfg)(PMF_STD_ARGS, u32 offset, u32 masklen, u32 valuelen,
		       u32 totallen, const u8 *maskdata, const u8 *valuedata);

	int (*read_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 len);
	int (*write_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 len, const u8 *data);
	int (*set_i2c_mode)(PMF_STD_ARGS, int mode);
	int (*rmw_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 masklen, u32 valuelen,
			   u32 totallen, const u8 *maskdata,
			   const u8 *valuedata);

	int (*read_reg32_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
			       u32 xor);
	int (*read_reg16_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
			       u32 xor);
	int (*read_reg8_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
			      u32 xor);

	int (*write_reg32_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
	int (*write_reg16_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
	int (*write_reg8_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);

	int (*mask_and_compare)(PMF_STD_ARGS, u32 len, const u8 *maskdata,
				const u8 *valuedata);

	struct module *owner;
};


/*
 * Drivers who expose platform functions register at init time, this
 * causes the platform functions for that device node to be parsed in
 * advance and associated with the device. The data structures are
 * partially public so a driver can walk the list of platform functions
 * and eventually inspect the flags
 */
struct pmf_device;

struct pmf_function {
	/* All functions for a given driver are linked */
	struct list_head	link;

	/* Function node & driver data */
	struct device_node	*node;
	void			*driver_data;

	/* For internal use by core */
	struct pmf_device	*dev;

	/* The name is the "xxx" in "platform-do-xxx", this is how
	 * platform functions are identified by this code. Some functions
	 * only operate for a given target, in which case the phandle is
	 * here (or 0 if the filter doesn't apply)
	 */
	const char		*name;
	u32			phandle;

	/* The flags for that function. You can have several functions
	 * with the same name and different flag
	 */
	u32			flags;

	/* The actual tokenized function blob */
	const void		*data;
	unsigned int		length;

	/* Interrupt clients */
	struct list_head	irq_clients;

	/* Refcounting */
	struct kref		ref;
};

/*
 * For platform functions that are interrupts, one can register
 * irq_client structures. You canNOT use the same structure twice
 * as it contains a link member. Also, the callback is called with
 * a spinlock held, you must not call back into any of the pmf_* functions
 * from within that callback
 */
struct pmf_irq_client {
	void			(*handler)(void *data);
	void			*data;
	struct module		*owner;
	struct list_head	link;
};


/*
 * Register/Unregister a function-capable driver and its handlers
 */
extern int pmf_register_driver(struct device_node *np,
			      struct pmf_handlers *handlers,
			      void *driverdata);

extern void pmf_unregister_driver(struct device_node *np);


/*
 * Register/Unregister interrupt clients
 */
extern int pmf_register_irq_client(struct device_node *np,
				   const char *name,
				   struct pmf_irq_client *client);

extern void pmf_unregister_irq_client(struct device_node *np,
				      const char *name,
				      struct pmf_irq_client *client);

/*
 * Called by the handlers when an irq happens
 */
extern void pmf_do_irq(struct pmf_function *func);


/*
 * Low level call to platform functions.
 *
 * The phandle can filter on the target object for functions that have
 * multiple targets, the flags allow you to restrict the call to a given
 * combination of flags.
 *
 * The args array contains as many arguments as is required by the function,
 * this is dependent on the function you are calling, unfortunately Apple
 * mecanism provides no way to encode that so you have to get it right at
 * the call site. Some functions require no args, in which case, you can
 * pass NULL.
 *
 * You can also pass NULL to the name. This will match any function that has
 * the appropriate combination of flags & phandle or you can pass 0 to the
 * phandle to match any
 */
extern int pmf_do_functions(struct device_node *np, const char *name,
			    u32 phandle, u32 flags, struct pmf_args *args);



/*
 * High level call to a platform function.
 *
 * This one looks for the platform-xxx first so you should call it to the
 * actual target if any. It will fallback to platform-do-xxx if it can't
 * find one. It will also exclusively target functions that have
 * the "OnDemand" flag.
 */

extern int pmf_call_function(struct device_node *target, const char *name,
			     struct pmf_args *args);


/*
 * For low latency interrupt usage, you can lookup for on-demand functions
 * using the functions below
 */

extern struct pmf_function *pmf_find_function(struct device_node *target,
					      const char *name);

extern struct pmf_function * pmf_get_function(struct pmf_function *func);
extern void pmf_put_function(struct pmf_function *func);

extern int pmf_call_one(struct pmf_function *func, struct pmf_args *args);


/* Suspend/resume code called by via-pmu directly for now */
extern void pmac_pfunc_base_suspend(void);
extern void pmac_pfunc_base_resume(void);

#endif /* __PMAC_PFUNC_H__ */
OpenPOWER on IntegriCloud