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 "priv.h"
25 
26 void
27 nv50_gpio_reset(struct nvkm_gpio *gpio, u8 match)
28 {
29 	struct nvkm_device *device = gpio->subdev.device;
30 	struct nvkm_bios *bios = device->bios;
31 	u8 ver, len;
32 	u16 entry;
33 	int ent = -1;
34 
35 	while ((entry = dcb_gpio_entry(bios, 0, ++ent, &ver, &len))) {
36 		static const u32 regs[] = { 0xe100, 0xe28c };
37 		u32 data = nvbios_rd32(bios, entry);
38 		u8  line =   (data & 0x0000001f);
39 		u8  func =   (data & 0x0000ff00) >> 8;
40 		u8  defs = !!(data & 0x01000000);
41 		u8  unk0 = !!(data & 0x02000000);
42 		u8  unk1 = !!(data & 0x04000000);
43 		u32 val = (unk1 << 16) | unk0;
44 		u32 reg = regs[line >> 4];
45 		u32 lsh = line & 0x0f;
46 
47 		if ( func  == DCB_GPIO_UNUSED ||
48 		    (match != DCB_GPIO_UNUSED && match != func))
49 			continue;
50 
51 		nvkm_gpio_set(gpio, 0, func, line, defs);
52 
53 		nvkm_mask(device, reg, 0x00010001 << lsh, val << lsh);
54 	}
55 }
56 
57 static int
58 nv50_gpio_location(int line, u32 *reg, u32 *shift)
59 {
60 	const u32 nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
61 
62 	if (line >= 32)
63 		return -EINVAL;
64 
65 	*reg = nv50_gpio_reg[line >> 3];
66 	*shift = (line & 7) << 2;
67 	return 0;
68 }
69 
70 int
71 nv50_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out)
72 {
73 	struct nvkm_device *device = gpio->subdev.device;
74 	u32 reg, shift;
75 
76 	if (nv50_gpio_location(line, &reg, &shift))
77 		return -EINVAL;
78 
79 	nvkm_mask(device, reg, 3 << shift, (((dir ^ 1) << 1) | out) << shift);
80 	return 0;
81 }
82 
83 int
84 nv50_gpio_sense(struct nvkm_gpio *gpio, int line)
85 {
86 	struct nvkm_device *device = gpio->subdev.device;
87 	u32 reg, shift;
88 
89 	if (nv50_gpio_location(line, &reg, &shift))
90 		return -EINVAL;
91 
92 	return !!(nvkm_rd32(device, reg) & (4 << shift));
93 }
94 
95 static void
96 nv50_gpio_intr_stat(struct nvkm_gpio *gpio, u32 *hi, u32 *lo)
97 {
98 	struct nvkm_device *device = gpio->subdev.device;
99 	u32 intr = nvkm_rd32(device, 0x00e054);
100 	u32 stat = nvkm_rd32(device, 0x00e050) & intr;
101 	*lo = (stat & 0xffff0000) >> 16;
102 	*hi = (stat & 0x0000ffff);
103 	nvkm_wr32(device, 0x00e054, intr);
104 }
105 
106 static void
107 nv50_gpio_intr_mask(struct nvkm_gpio *gpio, u32 type, u32 mask, u32 data)
108 {
109 	struct nvkm_device *device = gpio->subdev.device;
110 	u32 inte = nvkm_rd32(device, 0x00e050);
111 	if (type & NVKM_GPIO_LO)
112 		inte = (inte & ~(mask << 16)) | (data << 16);
113 	if (type & NVKM_GPIO_HI)
114 		inte = (inte & ~mask) | data;
115 	nvkm_wr32(device, 0x00e050, inte);
116 }
117 
118 static const struct nvkm_gpio_func
119 nv50_gpio = {
120 	.lines = 16,
121 	.intr_stat = nv50_gpio_intr_stat,
122 	.intr_mask = nv50_gpio_intr_mask,
123 	.drive = nv50_gpio_drive,
124 	.sense = nv50_gpio_sense,
125 	.reset = nv50_gpio_reset,
126 };
127 
128 int
129 nv50_gpio_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
130 	      struct nvkm_gpio **pgpio)
131 {
132 	return nvkm_gpio_new_(&nv50_gpio, device, type, inst, pgpio);
133 }
134