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 <subdev/bus.h>
25
26struct nvkm_hwsq {
27	struct nvkm_bus *pbus;
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_bus *pbus, struct nvkm_hwsq **phwsq)
45{
46	struct nvkm_hwsq *hwsq;
47
48	hwsq = *phwsq = kmalloc(sizeof(*hwsq), GFP_KERNEL);
49	if (hwsq) {
50		hwsq->pbus = pbus;
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_bus *pbus = hwsq->pbus;
67		hwsq->c.size = (hwsq->c.size + 4) / 4;
68		if (hwsq->c.size <= pbus->hwsq_size) {
69			if (exec)
70				ret = pbus->hwsq_exec(pbus, (u32 *)hwsq->c.data,
71						      hwsq->c.size);
72			if (ret)
73				nv_error(pbus, "hwsq exec failed: %d\n", ret);
74		} else {
75			nv_error(pbus, "hwsq ucode too large\n");
76			ret = -ENOSPC;
77		}
78
79		for (i = 0; ret && i < hwsq->c.size; i++)
80			nv_error(pbus, "\t0x%08x\n", ((u32 *)hwsq->c.data)[i]);
81
82		*phwsq = NULL;
83		kfree(hwsq);
84	}
85	return ret;
86}
87
88void
89nvkm_hwsq_wr32(struct nvkm_hwsq *hwsq, u32 addr, u32 data)
90{
91	nv_debug(hwsq->pbus, "R[%06x] = 0x%08x\n", addr, data);
92
93	if (hwsq->data != data) {
94		if ((data & 0xffff0000) != (hwsq->data & 0xffff0000)) {
95			hwsq_cmd(hwsq, 5, (u8[]){ 0xe2, data, data >> 8,
96						  data >> 16, data >> 24 });
97		} else {
98			hwsq_cmd(hwsq, 3, (u8[]){ 0x42, data, data >> 8 });
99		}
100	}
101
102	if ((addr & 0xffff0000) != (hwsq->addr & 0xffff0000)) {
103		hwsq_cmd(hwsq, 5, (u8[]){ 0xe0, addr, addr >> 8,
104					  addr >> 16, addr >> 24 });
105	} else {
106		hwsq_cmd(hwsq, 3, (u8[]){ 0x40, addr, addr >> 8 });
107	}
108
109	hwsq->addr = addr;
110	hwsq->data = data;
111}
112
113void
114nvkm_hwsq_setf(struct nvkm_hwsq *hwsq, u8 flag, int data)
115{
116	nv_debug(hwsq->pbus, " FLAG[%02x] = %d\n", flag, data);
117	flag += 0x80;
118	if (data >= 0)
119		flag += 0x20;
120	if (data >= 1)
121		flag += 0x20;
122	hwsq_cmd(hwsq, 1, (u8[]){ flag });
123}
124
125void
126nvkm_hwsq_wait(struct nvkm_hwsq *hwsq, u8 flag, u8 data)
127{
128	nv_debug(hwsq->pbus, " WAIT[%02x] = %d\n", flag, data);
129	hwsq_cmd(hwsq, 3, (u8[]){ 0x5f, flag, data });
130}
131
132void
133nvkm_hwsq_nsec(struct nvkm_hwsq *hwsq, u32 nsec)
134{
135	u8 shift = 0, usec = nsec / 1000;
136	while (usec & ~3) {
137		usec >>= 2;
138		shift++;
139	}
140
141	nv_debug(hwsq->pbus, "    DELAY = %d ns\n", nsec);
142	hwsq_cmd(hwsq, 1, (u8[]){ 0x00 | (shift << 2) | usec });
143}
144