1 /*
2  * Copyright 2012 Red Hat 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: Ben Skeggs
23  */
24 #include <subdev/bios.h>
25 #include <subdev/bios/dcb.h>
26 #include <subdev/bios/gpio.h>
27 #include <subdev/bios/xpio.h>
28 
29 u16
30 dcb_gpio_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
31 {
32 	u16 data = 0x0000;
33 	u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
34 	if (dcb) {
35 		if (*ver >= 0x30 && *hdr >= 0x0c)
36 			data = nvbios_rd16(bios, dcb + 0x0a);
37 		else
38 		if (*ver >= 0x22 && nvbios_rd08(bios, dcb - 1) >= 0x13)
39 			data = nvbios_rd16(bios, dcb - 0x0f);
40 
41 		if (data) {
42 			*ver = nvbios_rd08(bios, data + 0x00);
43 			if (*ver < 0x30) {
44 				*hdr = 3;
45 				*cnt = nvbios_rd08(bios, data + 0x02);
46 				*len = nvbios_rd08(bios, data + 0x01);
47 			} else
48 			if (*ver <= 0x41) {
49 				*hdr = nvbios_rd08(bios, data + 0x01);
50 				*cnt = nvbios_rd08(bios, data + 0x02);
51 				*len = nvbios_rd08(bios, data + 0x03);
52 			} else {
53 				data = 0x0000;
54 			}
55 		}
56 	}
57 	return data;
58 }
59 
60 u16
61 dcb_gpio_entry(struct nvkm_bios *bios, int idx, int ent, u8 *ver, u8 *len)
62 {
63 	u8  hdr, cnt, xver; /* use gpio version for xpio entry parsing */
64 	u16 gpio;
65 
66 	if (!idx--)
67 		gpio = dcb_gpio_table(bios, ver, &hdr, &cnt, len);
68 	else
69 		gpio = dcb_xpio_table(bios, idx, &xver, &hdr, &cnt, len);
70 
71 	if (gpio && ent < cnt)
72 		return gpio + hdr + (ent * *len);
73 
74 	return 0x0000;
75 }
76 
77 u16
78 dcb_gpio_parse(struct nvkm_bios *bios, int idx, int ent, u8 *ver, u8 *len,
79 	       struct dcb_gpio_func *gpio)
80 {
81 	u16 data = dcb_gpio_entry(bios, idx, ent, ver, len);
82 	if (data) {
83 		if (*ver < 0x40) {
84 			u16 info = nvbios_rd16(bios, data);
85 			*gpio = (struct dcb_gpio_func) {
86 				.line = (info & 0x001f) >> 0,
87 				.func = (info & 0x07e0) >> 5,
88 				.log[0] = (info & 0x1800) >> 11,
89 				.log[1] = (info & 0x6000) >> 13,
90 				.param = !!(info & 0x8000),
91 			};
92 		} else
93 		if (*ver < 0x41) {
94 			u32 info = nvbios_rd32(bios, data);
95 			*gpio = (struct dcb_gpio_func) {
96 				.line = (info & 0x0000001f) >> 0,
97 				.func = (info & 0x0000ff00) >> 8,
98 				.log[0] = (info & 0x18000000) >> 27,
99 				.log[1] = (info & 0x60000000) >> 29,
100 				.param = !!(info & 0x80000000),
101 			};
102 		} else {
103 			u32 info = nvbios_rd32(bios, data + 0);
104 			u8 info1 = nvbios_rd32(bios, data + 4);
105 			*gpio = (struct dcb_gpio_func) {
106 				.line = (info & 0x0000003f) >> 0,
107 				.func = (info & 0x0000ff00) >> 8,
108 				.log[0] = (info1 & 0x30) >> 4,
109 				.log[1] = (info1 & 0xc0) >> 6,
110 				.param = !!(info & 0x80000000),
111 			};
112 		}
113 	}
114 
115 	return data;
116 }
117 
118 u16
119 dcb_gpio_match(struct nvkm_bios *bios, int idx, u8 func, u8 line,
120 	       u8 *ver, u8 *len, struct dcb_gpio_func *gpio)
121 {
122 	u8  hdr, cnt, i = 0;
123 	u16 data;
124 
125 	while ((data = dcb_gpio_parse(bios, idx, i++, ver, len, gpio))) {
126 		if ((line == 0xff || line == gpio->line) &&
127 		    (func == 0xff || func == gpio->func))
128 			return data;
129 	}
130 
131 	/* DCB 2.2, fixed TVDAC GPIO data */
132 	if ((data = dcb_table(bios, ver, &hdr, &cnt, len))) {
133 		if (*ver >= 0x22 && *ver < 0x30 && func == DCB_GPIO_TVDAC0) {
134 			u8 conf = nvbios_rd08(bios, data - 5);
135 			u8 addr = nvbios_rd08(bios, data - 4);
136 			if (conf & 0x01) {
137 				*gpio = (struct dcb_gpio_func) {
138 					.func = DCB_GPIO_TVDAC0,
139 					.line = addr >> 4,
140 					.log[0] = !!(conf & 0x02),
141 					.log[1] =  !(conf & 0x02),
142 				};
143 				*ver = 0x00;
144 				return data;
145 			}
146 		}
147 	}
148 
149 	return 0x0000;
150 }
151