1/*
2 * Copyright 2013 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 <bskeggs@redhat.com>
23 */
24#include "priv.h"
25
26struct nvkm_hwsq {
27	struct nvkm_subdev *subdev;
28	u32 addr;
29	u32 data;
30	struct {
31		u8 data[512];
32		u16 size;
33	} c;
34};
35
36static void
37hwsq_cmd(struct nvkm_hwsq *hwsq, int size, u8 data[])
38{
39	memcpy(&hwsq->c.data[hwsq->c.size], data, size * sizeof(data[0]));
40	hwsq->c.size += size;
41}
42
43int
44nvkm_hwsq_init(struct nvkm_subdev *subdev, struct nvkm_hwsq **phwsq)
45{
46	struct nvkm_hwsq *hwsq;
47
48	hwsq = *phwsq = kmalloc(sizeof(*hwsq), GFP_KERNEL);
49	if (hwsq) {
50		hwsq->subdev = subdev;
51		hwsq->addr = ~0;
52		hwsq->data = ~0;
53		memset(hwsq->c.data, 0x7f, sizeof(hwsq->c.data));
54		hwsq->c.size = 0;
55	}
56
57	return hwsq ? 0 : -ENOMEM;
58}
59
60int
61nvkm_hwsq_fini(struct nvkm_hwsq **phwsq, bool exec)
62{
63	struct nvkm_hwsq *hwsq = *phwsq;
64	int ret = 0, i;
65	if (hwsq) {
66		struct nvkm_subdev *subdev = hwsq->subdev;
67		struct nvkm_bus *bus = subdev->device->bus;
68		hwsq->c.size = (hwsq->c.size + 4) / 4;
69		if (hwsq->c.size <= bus->func->hwsq_size) {
70			if (exec)
71				ret = bus->func->hwsq_exec(bus,
72							   (u32 *)hwsq->c.data,
73								  hwsq->c.size);
74			if (ret)
75				nvkm_error(subdev, "hwsq exec failed: %d\n", ret);
76		} else {
77			nvkm_error(subdev, "hwsq ucode too large\n");
78			ret = -ENOSPC;
79		}
80
81		for (i = 0; ret && i < hwsq->c.size; i++)
82			nvkm_error(subdev, "\t%08x\n", ((u32 *)hwsq->c.data)[i]);
83
84		*phwsq = NULL;
85		kfree(hwsq);
86	}
87	return ret;
88}
89
90void
91nvkm_hwsq_wr32(struct nvkm_hwsq *hwsq, u32 addr, u32 data)
92{
93	nvkm_debug(hwsq->subdev, "R[%06x] = %08x\n", addr, data);
94
95	if (hwsq->data != data) {
96		if ((data & 0xffff0000) != (hwsq->data & 0xffff0000)) {
97			hwsq_cmd(hwsq, 5, (u8[]){ 0xe2, data, data >> 8,
98						  data >> 16, data >> 24 });
99		} else {
100			hwsq_cmd(hwsq, 3, (u8[]){ 0x42, data, data >> 8 });
101		}
102	}
103
104	if ((addr & 0xffff0000) != (hwsq->addr & 0xffff0000)) {
105		hwsq_cmd(hwsq, 5, (u8[]){ 0xe0, addr, addr >> 8,
106					  addr >> 16, addr >> 24 });
107	} else {
108		hwsq_cmd(hwsq, 3, (u8[]){ 0x40, addr, addr >> 8 });
109	}
110
111	hwsq->addr = addr;
112	hwsq->data = data;
113}
114
115void
116nvkm_hwsq_setf(struct nvkm_hwsq *hwsq, u8 flag, int data)
117{
118	nvkm_debug(hwsq->subdev, " FLAG[%02x] = %d\n", flag, data);
119	flag += 0x80;
120	if (data >= 0)
121		flag += 0x20;
122	if (data >= 1)
123		flag += 0x20;
124	hwsq_cmd(hwsq, 1, (u8[]){ flag });
125}
126
127void
128nvkm_hwsq_wait(struct nvkm_hwsq *hwsq, u8 flag, u8 data)
129{
130	nvkm_debug(hwsq->subdev, " WAIT[%02x] = %d\n", flag, data);
131	hwsq_cmd(hwsq, 3, (u8[]){ 0x5f, flag, data });
132}
133
134void
135nvkm_hwsq_wait_vblank(struct nvkm_hwsq *hwsq)
136{
137	struct nvkm_subdev *subdev = hwsq->subdev;
138	struct nvkm_device *device = subdev->device;
139	u32 heads, x, y, px = 0;
140	int i, head_sync;
141
142	heads = nvkm_rd32(device, 0x610050);
143	for (i = 0; i < 2; i++) {
144		/* Heuristic: sync to head with biggest resolution */
145		if (heads & (2 << (i << 3))) {
146			x = nvkm_rd32(device, 0x610b40 + (0x540 * i));
147			y = (x & 0xffff0000) >> 16;
148			x &= 0x0000ffff;
149			if ((x * y) > px) {
150				px = (x * y);
151				head_sync = i;
152			}
153		}
154	}
155
156	if (px == 0) {
157		nvkm_debug(subdev, "WAIT VBLANK !NO ACTIVE HEAD\n");
158		return;
159	}
160
161	nvkm_debug(subdev, "WAIT VBLANK HEAD%d\n", head_sync);
162	nvkm_hwsq_wait(hwsq, head_sync ? 0x3 : 0x1, 0x0);
163	nvkm_hwsq_wait(hwsq, head_sync ? 0x3 : 0x1, 0x1);
164}
165
166void
167nvkm_hwsq_nsec(struct nvkm_hwsq *hwsq, u32 nsec)
168{
169	u8 shift = 0, usec = nsec / 1000;
170	while (usec & ~3) {
171		usec >>= 2;
172		shift++;
173	}
174
175	nvkm_debug(hwsq->subdev, "    DELAY = %d ns\n", nsec);
176	hwsq_cmd(hwsq, 1, (u8[]){ 0x00 | (shift << 2) | usec });
177}
178