1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Routines for GF1 DMA control
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <asm/dma.h>
8#include <linux/slab.h>
9#include <sound/core.h>
10#include <sound/gus.h>
11
12static void snd_gf1_dma_ack(struct snd_gus_card * gus)
13{
14 guard(spinlock_irqsave)(l: &gus->reg_lock);
15 snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, data: 0x00);
16 snd_gf1_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL);
17}
18
19static void snd_gf1_dma_program(struct snd_gus_card * gus,
20 unsigned int addr,
21 unsigned long buf_addr,
22 unsigned int count,
23 unsigned int cmd)
24{
25 unsigned int address;
26 unsigned char dma_cmd;
27 unsigned int address_high;
28
29 dev_dbg(gus->card->dev,
30 "dma_transfer: addr=0x%x, buf=0x%lx, count=0x%x\n",
31 addr, buf_addr, count);
32
33 if (gus->gf1.dma1 > 3) {
34 if (gus->gf1.enh_mode) {
35 address = addr >> 1;
36 } else {
37 if (addr & 0x1f) {
38 dev_dbg(gus->card->dev,
39 "%s: unaligned address (0x%x)?\n",
40 __func__, addr);
41 return;
42 }
43 address = (addr & 0x000c0000) | ((addr & 0x0003ffff) >> 1);
44 }
45 } else {
46 address = addr;
47 }
48
49 dma_cmd = SNDRV_GF1_DMA_ENABLE | (unsigned short) cmd;
50#if 0
51 dma_cmd |= 0x08;
52#endif
53 if (dma_cmd & SNDRV_GF1_DMA_16BIT) {
54 count++;
55 count &= ~1; /* align */
56 }
57 if (gus->gf1.dma1 > 3) {
58 dma_cmd |= SNDRV_GF1_DMA_WIDTH16;
59 count++;
60 count &= ~1; /* align */
61 }
62 snd_gf1_dma_ack(gus);
63 snd_dma_program(dma: gus->gf1.dma1, addr: buf_addr, size: count, mode: dma_cmd & SNDRV_GF1_DMA_READ ? DMA_MODE_READ : DMA_MODE_WRITE);
64#if 0
65 dev_dbg(gus->card->dev,
66 "address = 0x%x, count = 0x%x, dma_cmd = 0x%x\n",
67 address << 1, count, dma_cmd);
68#endif
69 guard(spinlock_irqsave)(l: &gus->reg_lock);
70 if (gus->gf1.enh_mode) {
71 address_high = ((address >> 16) & 0x000000f0) | (address & 0x0000000f);
72 snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, data: (unsigned short) (address >> 4));
73 snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_HIGH, data: (unsigned char) address_high);
74 } else
75 snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, data: (unsigned short) (address >> 4));
76 snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, data: dma_cmd);
77}
78
79static struct snd_gf1_dma_block *snd_gf1_dma_next_block(struct snd_gus_card * gus)
80{
81 struct snd_gf1_dma_block *block;
82
83 /* PCM block have bigger priority than synthesizer one */
84 if (gus->gf1.dma_data_pcm) {
85 block = gus->gf1.dma_data_pcm;
86 if (gus->gf1.dma_data_pcm_last == block) {
87 gus->gf1.dma_data_pcm =
88 gus->gf1.dma_data_pcm_last = NULL;
89 } else {
90 gus->gf1.dma_data_pcm = block->next;
91 }
92 } else if (gus->gf1.dma_data_synth) {
93 block = gus->gf1.dma_data_synth;
94 if (gus->gf1.dma_data_synth_last == block) {
95 gus->gf1.dma_data_synth =
96 gus->gf1.dma_data_synth_last = NULL;
97 } else {
98 gus->gf1.dma_data_synth = block->next;
99 }
100 } else {
101 block = NULL;
102 }
103 if (block) {
104 gus->gf1.dma_ack = block->ack;
105 gus->gf1.dma_private_data = block->private_data;
106 }
107 return block;
108}
109
110
111static void snd_gf1_dma_interrupt(struct snd_gus_card * gus)
112{
113 struct snd_gf1_dma_block *block;
114
115 snd_gf1_dma_ack(gus);
116 if (gus->gf1.dma_ack)
117 gus->gf1.dma_ack(gus, gus->gf1.dma_private_data);
118 scoped_guard(spinlock, &gus->dma_lock) {
119 if (gus->gf1.dma_data_pcm == NULL &&
120 gus->gf1.dma_data_synth == NULL) {
121 gus->gf1.dma_ack = NULL;
122 gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER;
123 return;
124 }
125 block = snd_gf1_dma_next_block(gus);
126 }
127 if (!block)
128 return;
129 snd_gf1_dma_program(gus, addr: block->addr, buf_addr: block->buf_addr, count: block->count, cmd: (unsigned short) block->cmd);
130 kfree(objp: block);
131#if 0
132 dev_dbg(gus->card->dev,
133 "program dma (IRQ) - addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n",
134 block->addr, block->buf_addr, block->count, block->cmd);
135#endif
136}
137
138int snd_gf1_dma_init(struct snd_gus_card * gus)
139{
140 guard(mutex)(T: &gus->dma_mutex);
141 gus->gf1.dma_shared++;
142 if (gus->gf1.dma_shared > 1)
143 return 0;
144 gus->gf1.interrupt_handler_dma_write = snd_gf1_dma_interrupt;
145 gus->gf1.dma_data_pcm =
146 gus->gf1.dma_data_pcm_last =
147 gus->gf1.dma_data_synth =
148 gus->gf1.dma_data_synth_last = NULL;
149 return 0;
150}
151
152int snd_gf1_dma_done(struct snd_gus_card * gus)
153{
154 struct snd_gf1_dma_block *block;
155
156 guard(mutex)(T: &gus->dma_mutex);
157 gus->gf1.dma_shared--;
158 if (!gus->gf1.dma_shared) {
159 snd_dma_disable(dma: gus->gf1.dma1);
160 snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_WRITE);
161 snd_gf1_dma_ack(gus);
162 while ((block = gus->gf1.dma_data_pcm)) {
163 gus->gf1.dma_data_pcm = block->next;
164 kfree(objp: block);
165 }
166 while ((block = gus->gf1.dma_data_synth)) {
167 gus->gf1.dma_data_synth = block->next;
168 kfree(objp: block);
169 }
170 gus->gf1.dma_data_pcm_last =
171 gus->gf1.dma_data_synth_last = NULL;
172 }
173 return 0;
174}
175
176int snd_gf1_dma_transfer_block(struct snd_gus_card * gus,
177 struct snd_gf1_dma_block * __block,
178 int atomic,
179 int synth)
180{
181 struct snd_gf1_dma_block *block;
182 struct snd_gf1_dma_block *free_block = NULL;
183
184 block = kmalloc(sizeof(*block), atomic ? GFP_ATOMIC : GFP_KERNEL);
185 if (!block)
186 return -ENOMEM;
187
188 *block = *__block;
189 block->next = NULL;
190
191 dev_dbg(gus->card->dev,
192 "addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n",
193 block->addr, (long) block->buffer, block->count,
194 block->cmd);
195
196 dev_dbg(gus->card->dev,
197 "gus->gf1.dma_data_pcm_last = 0x%lx\n",
198 (long)gus->gf1.dma_data_pcm_last);
199 dev_dbg(gus->card->dev,
200 "gus->gf1.dma_data_pcm = 0x%lx\n",
201 (long)gus->gf1.dma_data_pcm);
202
203 scoped_guard(spinlock_irqsave, &gus->dma_lock) {
204 if (synth) {
205 if (gus->gf1.dma_data_synth_last) {
206 gus->gf1.dma_data_synth_last->next = block;
207 gus->gf1.dma_data_synth_last = block;
208 } else {
209 gus->gf1.dma_data_synth =
210 gus->gf1.dma_data_synth_last = block;
211 }
212 } else {
213 if (gus->gf1.dma_data_pcm_last) {
214 gus->gf1.dma_data_pcm_last->next = block;
215 gus->gf1.dma_data_pcm_last = block;
216 } else {
217 gus->gf1.dma_data_pcm =
218 gus->gf1.dma_data_pcm_last = block;
219 }
220 }
221 if (!(gus->gf1.dma_flags & SNDRV_GF1_DMA_TRIGGER)) {
222 gus->gf1.dma_flags |= SNDRV_GF1_DMA_TRIGGER;
223 free_block = snd_gf1_dma_next_block(gus);
224 }
225 }
226
227 if (free_block) {
228 snd_gf1_dma_program(gus, addr: free_block->addr, buf_addr: free_block->buf_addr,
229 count: free_block->count,
230 cmd: (unsigned short)free_block->cmd);
231 kfree(objp: free_block);
232 }
233
234 return 0;
235}
236

source code of linux/sound/isa/gus/gus_dma.c