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 
249 /* Suspend/resume code called by via-pmu directly for now */
250 extern void pmac_pfunc_base_suspend(void);
251 extern void pmac_pfunc_base_resume(void);
252 
253 #endif /* __PMAC_PFUNC_H__ */
254