1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __PMAC_PFUNC_H__
3 #define __PMAC_PFUNC_H__
4
5 #include <linux/types.h>
6 #include <linux/list.h>
7
8 /* Flags in command lists */
9 #define PMF_FLAGS_ON_INIT 0x80000000u
10 #define PMF_FLGAS_ON_TERM 0x40000000u
11 #define PMF_FLAGS_ON_SLEEP 0x20000000u
12 #define PMF_FLAGS_ON_WAKE 0x10000000u
13 #define PMF_FLAGS_ON_DEMAND 0x08000000u
14 #define PMF_FLAGS_INT_GEN 0x04000000u
15 #define PMF_FLAGS_HIGH_SPEED 0x02000000u
16 #define PMF_FLAGS_LOW_SPEED 0x01000000u
17 #define PMF_FLAGS_SIDE_EFFECTS 0x00800000u
18
19 /*
20 * Arguments to a platform function call.
21 *
22 * NOTE: By convention, pointer arguments point to an u32
23 */
24 struct pmf_args {
25 union {
26 u32 v;
27 u32 *p;
28 } u[4];
29 unsigned int count;
30 };
31
32 /*
33 * A driver capable of interpreting commands provides a handlers
34 * structure filled with whatever handlers are implemented by this
35 * driver. Non implemented handlers are left NULL.
36 *
37 * PMF_STD_ARGS are the same arguments that are passed to the parser
38 * and that gets passed back to the various handlers.
39 *
40 * Interpreting a given function always start with a begin() call which
41 * returns an instance data to be passed around subsequent calls, and
42 * ends with an end() call. This allows the low level driver to implement
43 * locking policy or per-function instance data.
44 *
45 * For interrupt capable functions, irq_enable() is called when a client
46 * registers, and irq_disable() is called when the last client unregisters
47 * Note that irq_enable & irq_disable are called within a semaphore held
48 * by the core, thus you should not try to register yourself to some other
49 * pmf interrupt during those calls.
50 */
51
52 #define PMF_STD_ARGS struct pmf_function *func, void *instdata, \
53 struct pmf_args *args
54
55 struct pmf_function;
56
57 struct pmf_handlers {
58 void * (*begin)(struct pmf_function *func, struct pmf_args *args);
59 void (*end)(struct pmf_function *func, void *instdata);
60
61 int (*irq_enable)(struct pmf_function *func);
62 int (*irq_disable)(struct pmf_function *func);
63
64 int (*write_gpio)(PMF_STD_ARGS, u8 value, u8 mask);
65 int (*read_gpio)(PMF_STD_ARGS, u8 mask, int rshift, u8 xor);
66
67 int (*write_reg32)(PMF_STD_ARGS, u32 offset, u32 value, u32 mask);
68 int (*read_reg32)(PMF_STD_ARGS, u32 offset);
69 int (*write_reg16)(PMF_STD_ARGS, u32 offset, u16 value, u16 mask);
70 int (*read_reg16)(PMF_STD_ARGS, u32 offset);
71 int (*write_reg8)(PMF_STD_ARGS, u32 offset, u8 value, u8 mask);
72 int (*read_reg8)(PMF_STD_ARGS, u32 offset);
73
74 int (*delay)(PMF_STD_ARGS, u32 duration);
75
76 int (*wait_reg32)(PMF_STD_ARGS, u32 offset, u32 value, u32 mask);
77 int (*wait_reg16)(PMF_STD_ARGS, u32 offset, u16 value, u16 mask);
78 int (*wait_reg8)(PMF_STD_ARGS, u32 offset, u8 value, u8 mask);
79
80 int (*read_i2c)(PMF_STD_ARGS, u32 len);
81 int (*write_i2c)(PMF_STD_ARGS, u32 len, const u8 *data);
82 int (*rmw_i2c)(PMF_STD_ARGS, u32 masklen, u32 valuelen, u32 totallen,
83 const u8 *maskdata, const u8 *valuedata);
84
85 int (*read_cfg)(PMF_STD_ARGS, u32 offset, u32 len);
86 int (*write_cfg)(PMF_STD_ARGS, u32 offset, u32 len, const u8 *data);
87 int (*rmw_cfg)(PMF_STD_ARGS, u32 offset, u32 masklen, u32 valuelen,
88 u32 totallen, const u8 *maskdata, const u8 *valuedata);
89
90 int (*read_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 len);
91 int (*write_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 len, const u8 *data);
92 int (*set_i2c_mode)(PMF_STD_ARGS, int mode);
93 int (*rmw_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 masklen, u32 valuelen,
94 u32 totallen, const u8 *maskdata,
95 const u8 *valuedata);
96
97 int (*read_reg32_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
98 u32 xor);
99 int (*read_reg16_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
100 u32 xor);
101 int (*read_reg8_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
102 u32 xor);
103
104 int (*write_reg32_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
105 int (*write_reg16_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
106 int (*write_reg8_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
107
108 int (*mask_and_compare)(PMF_STD_ARGS, u32 len, const u8 *maskdata,
109 const u8 *valuedata);
110
111 struct module *owner;
112 };
113
114
115 /*
116 * Drivers who expose platform functions register at init time, this
117 * causes the platform functions for that device node to be parsed in
118 * advance and associated with the device. The data structures are
119 * partially public so a driver can walk the list of platform functions
120 * and eventually inspect the flags
121 */
122 struct pmf_device;
123
124 struct pmf_function {
125 /* All functions for a given driver are linked */
126 struct list_head link;
127
128 /* Function node & driver data */
129 struct device_node *node;
130 void *driver_data;
131
132 /* For internal use by core */
133 struct pmf_device *dev;
134
135 /* The name is the "xxx" in "platform-do-xxx", this is how
136 * platform functions are identified by this code. Some functions
137 * only operate for a given target, in which case the phandle is
138 * here (or 0 if the filter doesn't apply)
139 */
140 const char *name;
141 u32 phandle;
142
143 /* The flags for that function. You can have several functions
144 * with the same name and different flag
145 */
146 u32 flags;
147
148 /* The actual tokenized function blob */
149 const void *data;
150 unsigned int length;
151
152 /* Interrupt clients */
153 struct list_head irq_clients;
154
155 /* Refcounting */
156 struct kref ref;
157 };
158
159 /*
160 * For platform functions that are interrupts, one can register
161 * irq_client structures. You canNOT use the same structure twice
162 * as it contains a link member. Also, the callback is called with
163 * a spinlock held, you must not call back into any of the pmf_* functions
164 * from within that callback
165 */
166 struct pmf_irq_client {
167 void (*handler)(void *data);
168 void *data;
169 struct module *owner;
170 struct list_head link;
171 struct pmf_function *func;
172 };
173
174
175 /*
176 * Register/Unregister a function-capable driver and its handlers
177 */
178 extern int pmf_register_driver(struct device_node *np,
179 struct pmf_handlers *handlers,
180 void *driverdata);
181
182 extern void pmf_unregister_driver(struct device_node *np);
183
184
185 /*
186 * Register/Unregister interrupt clients
187 */
188 extern int pmf_register_irq_client(struct device_node *np,
189 const char *name,
190 struct pmf_irq_client *client);
191
192 extern void pmf_unregister_irq_client(struct pmf_irq_client *client);
193
194 /*
195 * Called by the handlers when an irq happens
196 */
197 extern void pmf_do_irq(struct pmf_function *func);
198
199
200 /*
201 * Low level call to platform functions.
202 *
203 * The phandle can filter on the target object for functions that have
204 * multiple targets, the flags allow you to restrict the call to a given
205 * combination of flags.
206 *
207 * The args array contains as many arguments as is required by the function,
208 * this is dependent on the function you are calling, unfortunately Apple
209 * mechanism provides no way to encode that so you have to get it right at
210 * the call site. Some functions require no args, in which case, you can
211 * pass NULL.
212 *
213 * You can also pass NULL to the name. This will match any function that has
214 * the appropriate combination of flags & phandle or you can pass 0 to the
215 * phandle to match any
216 */
217 extern int pmf_do_functions(struct device_node *np, const char *name,
218 u32 phandle, u32 flags, struct pmf_args *args);
219
220
221
222 /*
223 * High level call to a platform function.
224 *
225 * This one looks for the platform-xxx first so you should call it to the
226 * actual target if any. It will fallback to platform-do-xxx if it can't
227 * find one. It will also exclusively target functions that have
228 * the "OnDemand" flag.
229 */
230
231 extern int pmf_call_function(struct device_node *target, const char *name,
232 struct pmf_args *args);
233
234
235 /*
236 * For low latency interrupt usage, you can lookup for on-demand functions
237 * using the functions below
238 */
239
240 extern struct pmf_function *pmf_find_function(struct device_node *target,
241 const char *name);
242
243 extern struct pmf_function * pmf_get_function(struct pmf_function *func);
244 extern void pmf_put_function(struct pmf_function *func);
245
246 extern int pmf_call_one(struct pmf_function *func, struct pmf_args *args);
247
248 int pmac_pfunc_base_install(void);
249
250 /* Suspend/resume code called by via-pmu directly for now */
251 extern void pmac_pfunc_base_suspend(void);
252 extern void pmac_pfunc_base_resume(void);
253
254 #endif /* __PMAC_PFUNC_H__ */