1/*
2 * Copyright 2011 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#include <core/option.h>
27
28static int
29nvkm_gpio_drive(struct nvkm_gpio *gpio, int idx, int line, int dir, int out)
30{
31	return gpio->func->drive(gpio, line, dir, out);
32}
33
34static int
35nvkm_gpio_sense(struct nvkm_gpio *gpio, int idx, int line)
36{
37	return gpio->func->sense(gpio, line);
38}
39
40void
41nvkm_gpio_reset(struct nvkm_gpio *gpio, u8 func)
42{
43	if (gpio->func->reset)
44		gpio->func->reset(gpio, func);
45}
46
47int
48nvkm_gpio_find(struct nvkm_gpio *gpio, int idx, u8 tag, u8 line,
49	       struct dcb_gpio_func *func)
50{
51	struct nvkm_device *device = gpio->subdev.device;
52	struct nvkm_bios *bios = device->bios;
53	u8  ver, len;
54	u16 data;
55
56	if (line == 0xff && tag == 0xff)
57		return -EINVAL;
58
59	data = dcb_gpio_match(bios, idx, tag, line, &ver, &len, func);
60	if (data)
61		return 0;
62
63	/* Apple iMac G4 NV18 */
64	if (device->quirk && device->quirk->tv_gpio) {
65		if (tag == DCB_GPIO_TVDAC0) {
66			*func = (struct dcb_gpio_func) {
67				.func = DCB_GPIO_TVDAC0,
68				.line = device->quirk->tv_gpio,
69				.log[0] = 0,
70				.log[1] = 1,
71			};
72			return 0;
73		}
74	}
75
76	return -ENOENT;
77}
78
79int
80nvkm_gpio_set(struct nvkm_gpio *gpio, int idx, u8 tag, u8 line, int state)
81{
82	struct dcb_gpio_func func;
83	int ret;
84
85	ret = nvkm_gpio_find(gpio, idx, tag, line, &func);
86	if (ret == 0) {
87		int dir = !!(func.log[state] & 0x02);
88		int out = !!(func.log[state] & 0x01);
89		ret = nvkm_gpio_drive(gpio, idx, func.line, dir, out);
90	}
91
92	return ret;
93}
94
95int
96nvkm_gpio_get(struct nvkm_gpio *gpio, int idx, u8 tag, u8 line)
97{
98	struct dcb_gpio_func func;
99	int ret;
100
101	ret = nvkm_gpio_find(gpio, idx, tag, line, &func);
102	if (ret == 0) {
103		ret = nvkm_gpio_sense(gpio, idx, func.line);
104		if (ret >= 0)
105			ret = (ret == (func.log[1] & 1));
106	}
107
108	return ret;
109}
110
111static void
112nvkm_gpio_intr_fini(struct nvkm_event *event, int type, int index)
113{
114	struct nvkm_gpio *gpio = container_of(event, typeof(*gpio), event);
115	gpio->func->intr_mask(gpio, type, 1 << index, 0);
116}
117
118static void
119nvkm_gpio_intr_init(struct nvkm_event *event, int type, int index)
120{
121	struct nvkm_gpio *gpio = container_of(event, typeof(*gpio), event);
122	gpio->func->intr_mask(gpio, type, 1 << index, 1 << index);
123}
124
125static const struct nvkm_event_func
126nvkm_gpio_intr_func = {
127	.init = nvkm_gpio_intr_init,
128	.fini = nvkm_gpio_intr_fini,
129};
130
131static void
132nvkm_gpio_intr(struct nvkm_subdev *subdev)
133{
134	struct nvkm_gpio *gpio = nvkm_gpio(subdev);
135	u32 hi, lo, i;
136
137	gpio->func->intr_stat(gpio, &hi, &lo);
138
139	for (i = 0; (hi | lo) && i < gpio->func->lines; i++) {
140		u32 mask = (NVKM_GPIO_HI * !!(hi & (1 << i))) |
141			   (NVKM_GPIO_LO * !!(lo & (1 << i)));
142		nvkm_event_ntfy(&gpio->event, i, mask);
143	}
144}
145
146static int
147nvkm_gpio_fini(struct nvkm_subdev *subdev, bool suspend)
148{
149	struct nvkm_gpio *gpio = nvkm_gpio(subdev);
150	u32 mask = (1ULL << gpio->func->lines) - 1;
151
152	gpio->func->intr_mask(gpio, NVKM_GPIO_TOGGLED, mask, 0);
153	gpio->func->intr_stat(gpio, &mask, &mask);
154	return 0;
155}
156
157static const struct dmi_system_id gpio_reset_ids[] = {
158	{
159		.ident = "Apple Macbook 10,1",
160		.matches = {
161			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
162			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro10,1"),
163		}
164	},
165	{ }
166};
167
168static enum dcb_gpio_func_name power_checks[] = {
169	DCB_GPIO_THERM_EXT_POWER_EVENT,
170	DCB_GPIO_POWER_ALERT,
171	DCB_GPIO_EXT_POWER_LOW,
172};
173
174static int
175nvkm_gpio_init(struct nvkm_subdev *subdev)
176{
177	struct nvkm_gpio *gpio = nvkm_gpio(subdev);
178	struct dcb_gpio_func func;
179	int ret;
180	int i;
181
182	if (dmi_check_system(gpio_reset_ids))
183		nvkm_gpio_reset(gpio, DCB_GPIO_UNUSED);
184
185	if (nvkm_boolopt(subdev->device->cfgopt, "NvPowerChecks", true)) {
186		for (i = 0; i < ARRAY_SIZE(power_checks); ++i) {
187			ret = nvkm_gpio_find(gpio, 0, power_checks[i],
188					     DCB_GPIO_UNUSED, &func);
189			if (ret)
190				continue;
191
192			ret = nvkm_gpio_get(gpio, 0, func.func, func.line);
193			if (!ret)
194				continue;
195
196			nvkm_error(&gpio->subdev,
197				   "GPU is missing power, check its power "
198				   "cables.  Boot with "
199				   "nouveau.config=NvPowerChecks=0 to "
200				   "disable.\n");
201			return -EINVAL;
202		}
203	}
204
205	return 0;
206}
207
208static void *
209nvkm_gpio_dtor(struct nvkm_subdev *subdev)
210{
211	struct nvkm_gpio *gpio = nvkm_gpio(subdev);
212	nvkm_event_fini(&gpio->event);
213	return gpio;
214}
215
216static const struct nvkm_subdev_func
217nvkm_gpio = {
218	.dtor = nvkm_gpio_dtor,
219	.init = nvkm_gpio_init,
220	.fini = nvkm_gpio_fini,
221	.intr = nvkm_gpio_intr,
222};
223
224int
225nvkm_gpio_new_(const struct nvkm_gpio_func *func, struct nvkm_device *device,
226	       enum nvkm_subdev_type type, int inst, struct nvkm_gpio **pgpio)
227{
228	struct nvkm_gpio *gpio;
229
230	if (!(gpio = *pgpio = kzalloc(sizeof(*gpio), GFP_KERNEL)))
231		return -ENOMEM;
232
233	nvkm_subdev_ctor(&nvkm_gpio, device, type, inst, &gpio->subdev);
234	gpio->func = func;
235
236	return nvkm_event_init(&nvkm_gpio_intr_func, &gpio->subdev, 2, func->lines, &gpio->event);
237}
238