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
26 struct 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
36 static void
hwsq_cmd(struct nvkm_hwsq * hwsq,int size,u8 data[])37 hwsq_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
43 int
nvkm_hwsq_init(struct nvkm_bus * pbus,struct nvkm_hwsq ** phwsq)44 nvkm_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
60 int
nvkm_hwsq_fini(struct nvkm_hwsq ** phwsq,bool exec)61 nvkm_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
88 void
nvkm_hwsq_wr32(struct nvkm_hwsq * hwsq,u32 addr,u32 data)89 nvkm_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
113 void
nvkm_hwsq_setf(struct nvkm_hwsq * hwsq,u8 flag,int data)114 nvkm_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
125 void
nvkm_hwsq_wait(struct nvkm_hwsq * hwsq,u8 flag,u8 data)126 nvkm_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
132 void
nvkm_hwsq_nsec(struct nvkm_hwsq * hwsq,u32 nsec)133 nvkm_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