1 /*
2  * Copyright 2019 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: AMD
23  *
24  */
25 
26 #include "dmub_reg.h"
27 #include "../dmub_srv.h"
28 
29 struct dmub_reg_value_masks {
30 	uint32_t value;
31 	uint32_t mask;
32 };
33 
34 static inline void
set_reg_field_value_masks(struct dmub_reg_value_masks * field_value_mask,uint32_t value,uint32_t mask,uint8_t shift)35 set_reg_field_value_masks(struct dmub_reg_value_masks *field_value_mask,
36 			  uint32_t value, uint32_t mask, uint8_t shift)
37 {
38 	field_value_mask->value =
39 		(field_value_mask->value & ~mask) | (mask & (value << shift));
40 	field_value_mask->mask = field_value_mask->mask | mask;
41 }
42 
set_reg_field_values(struct dmub_reg_value_masks * field_value_mask,uint32_t addr,int n,uint8_t shift1,uint32_t mask1,uint32_t field_value1,va_list ap)43 static void set_reg_field_values(struct dmub_reg_value_masks *field_value_mask,
44 				 uint32_t addr, int n, uint8_t shift1,
45 				 uint32_t mask1, uint32_t field_value1,
46 				 va_list ap)
47 {
48 	uint32_t shift, mask, field_value;
49 	int i = 1;
50 
51 	/* gather all bits value/mask getting updated in this register */
52 	set_reg_field_value_masks(field_value_mask, field_value1, mask1,
53 				  shift1);
54 
55 	while (i < n) {
56 		shift = va_arg(ap, uint32_t);
57 		mask = va_arg(ap, uint32_t);
58 		field_value = va_arg(ap, uint32_t);
59 
60 		set_reg_field_value_masks(field_value_mask, field_value, mask,
61 					  shift);
62 		i++;
63 	}
64 }
65 
get_reg_field_value_ex(uint32_t reg_value,uint32_t mask,uint8_t shift)66 static inline uint32_t get_reg_field_value_ex(uint32_t reg_value, uint32_t mask,
67 					      uint8_t shift)
68 {
69 	return (mask & reg_value) >> shift;
70 }
71 
dmub_reg_update(struct dmub_srv * srv,uint32_t addr,int n,uint8_t shift1,uint32_t mask1,uint32_t field_value1,...)72 void dmub_reg_update(struct dmub_srv *srv, uint32_t addr, int n, uint8_t shift1,
73 		     uint32_t mask1, uint32_t field_value1, ...)
74 {
75 	struct dmub_reg_value_masks field_value_mask = { 0 };
76 	uint32_t reg_val;
77 	va_list ap;
78 
79 	va_start(ap, field_value1);
80 	set_reg_field_values(&field_value_mask, addr, n, shift1, mask1,
81 			     field_value1, ap);
82 	va_end(ap);
83 
84 	reg_val = srv->funcs.reg_read(srv->user_ctx, addr);
85 	reg_val = (reg_val & ~field_value_mask.mask) | field_value_mask.value;
86 	srv->funcs.reg_write(srv->user_ctx, addr, reg_val);
87 }
88 
dmub_reg_set(struct dmub_srv * srv,uint32_t addr,uint32_t reg_val,int n,uint8_t shift1,uint32_t mask1,uint32_t field_value1,...)89 void dmub_reg_set(struct dmub_srv *srv, uint32_t addr, uint32_t reg_val, int n,
90 		  uint8_t shift1, uint32_t mask1, uint32_t field_value1, ...)
91 {
92 	struct dmub_reg_value_masks field_value_mask = { 0 };
93 	va_list ap;
94 
95 	va_start(ap, field_value1);
96 	set_reg_field_values(&field_value_mask, addr, n, shift1, mask1,
97 			     field_value1, ap);
98 	va_end(ap);
99 
100 	reg_val = (reg_val & ~field_value_mask.mask) | field_value_mask.value;
101 	srv->funcs.reg_write(srv->user_ctx, addr, reg_val);
102 }
103 
dmub_reg_get(struct dmub_srv * srv,uint32_t addr,uint8_t shift,uint32_t mask,uint32_t * field_value)104 void dmub_reg_get(struct dmub_srv *srv, uint32_t addr, uint8_t shift,
105 		  uint32_t mask, uint32_t *field_value)
106 {
107 	uint32_t reg_val = srv->funcs.reg_read(srv->user_ctx, addr);
108 	*field_value = get_reg_field_value_ex(reg_val, mask, shift);
109 }
110