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
nv50_gpio_reset(struct nvkm_gpio * gpio,u8 match)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
nv50_gpio_location(int line,u32 * reg,u32 * shift)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
nv50_gpio_drive(struct nvkm_gpio * gpio,int line,int dir,int out)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, ®, &shift))
77 return -EINVAL;
78
79 nvkm_mask(device, reg, 3 << shift, (((dir ^ 1) << 1) | out) << shift);
80 return 0;
81 }
82
83 int
nv50_gpio_sense(struct nvkm_gpio * gpio,int line)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, ®, &shift))
90 return -EINVAL;
91
92 return !!(nvkm_rd32(device, reg) & (4 << shift));
93 }
94
95 static void
nv50_gpio_intr_stat(struct nvkm_gpio * gpio,u32 * hi,u32 * lo)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
nv50_gpio_intr_mask(struct nvkm_gpio * gpio,u32 type,u32 mask,u32 data)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
nv50_gpio_new(struct nvkm_device * device,enum nvkm_subdev_type type,int inst,struct nvkm_gpio ** pgpio)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