1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Routine for IRQ handling from GF1/InterWave chip
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7 #include <sound/core.h>
8 #include <sound/info.h>
9 #include <sound/gus.h>
10
11 #ifdef CONFIG_SND_DEBUG
12 #define STAT_ADD(x) ((x)++)
13 #else
14 #define STAT_ADD(x) while (0) { ; }
15 #endif
16
snd_gus_interrupt(int irq,void * dev_id)17 irqreturn_t snd_gus_interrupt(int irq, void *dev_id)
18 {
19 struct snd_gus_card * gus = dev_id;
20 unsigned char status;
21 int loop = 100;
22 int handled = 0;
23
24 __again:
25 status = inb(gus->gf1.reg_irqstat);
26 if (status == 0)
27 return IRQ_RETVAL(handled);
28 handled = 1;
29 /* snd_printk(KERN_DEBUG "IRQ: status = 0x%x\n", status); */
30 if (status & 0x02) {
31 STAT_ADD(gus->gf1.interrupt_stat_midi_in);
32 if (gus->gf1.interrupt_handler_midi_in)
33 gus->gf1.interrupt_handler_midi_in(gus);
34 }
35 if (status & 0x01) {
36 STAT_ADD(gus->gf1.interrupt_stat_midi_out);
37 if (gus->gf1.interrupt_handler_midi_out)
38 gus->gf1.interrupt_handler_midi_out(gus);
39 }
40 if (status & (0x20 | 0x40)) {
41 unsigned int already, _current_;
42 unsigned char voice_status, voice;
43 struct snd_gus_voice *pvoice;
44
45 already = 0;
46 while (((voice_status = snd_gf1_i_read8(gus, SNDRV_GF1_GB_VOICES_IRQ)) & 0xc0) != 0xc0) {
47 voice = voice_status & 0x1f;
48 _current_ = 1 << voice;
49 if (already & _current_)
50 continue; /* multi request */
51 already |= _current_; /* mark request */
52 #if 0
53 printk(KERN_DEBUG "voice = %i, voice_status = 0x%x, "
54 "voice_verify = %i\n",
55 voice, voice_status, inb(GUSP(gus, GF1PAGE)));
56 #endif
57 pvoice = &gus->gf1.voices[voice];
58 if (pvoice->use) {
59 if (!(voice_status & 0x80)) { /* voice position IRQ */
60 STAT_ADD(pvoice->interrupt_stat_wave);
61 pvoice->handler_wave(gus, pvoice);
62 }
63 if (!(voice_status & 0x40)) { /* volume ramp IRQ */
64 STAT_ADD(pvoice->interrupt_stat_volume);
65 pvoice->handler_volume(gus, pvoice);
66 }
67 } else {
68 STAT_ADD(gus->gf1.interrupt_stat_voice_lost);
69 snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_ADDRESS_CONTROL);
70 snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
71 }
72 }
73 }
74 if (status & 0x04) {
75 STAT_ADD(gus->gf1.interrupt_stat_timer1);
76 if (gus->gf1.interrupt_handler_timer1)
77 gus->gf1.interrupt_handler_timer1(gus);
78 }
79 if (status & 0x08) {
80 STAT_ADD(gus->gf1.interrupt_stat_timer2);
81 if (gus->gf1.interrupt_handler_timer2)
82 gus->gf1.interrupt_handler_timer2(gus);
83 }
84 if (status & 0x80) {
85 if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL) & 0x40) {
86 STAT_ADD(gus->gf1.interrupt_stat_dma_write);
87 if (gus->gf1.interrupt_handler_dma_write)
88 gus->gf1.interrupt_handler_dma_write(gus);
89 }
90 if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL) & 0x40) {
91 STAT_ADD(gus->gf1.interrupt_stat_dma_read);
92 if (gus->gf1.interrupt_handler_dma_read)
93 gus->gf1.interrupt_handler_dma_read(gus);
94 }
95 }
96 if (--loop > 0)
97 goto __again;
98 return IRQ_NONE;
99 }
100
101 #ifdef CONFIG_SND_DEBUG
snd_gus_irq_info_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)102 static void snd_gus_irq_info_read(struct snd_info_entry *entry,
103 struct snd_info_buffer *buffer)
104 {
105 struct snd_gus_card *gus;
106 struct snd_gus_voice *pvoice;
107 int idx;
108
109 gus = entry->private_data;
110 snd_iprintf(buffer, "midi out = %u\n", gus->gf1.interrupt_stat_midi_out);
111 snd_iprintf(buffer, "midi in = %u\n", gus->gf1.interrupt_stat_midi_in);
112 snd_iprintf(buffer, "timer1 = %u\n", gus->gf1.interrupt_stat_timer1);
113 snd_iprintf(buffer, "timer2 = %u\n", gus->gf1.interrupt_stat_timer2);
114 snd_iprintf(buffer, "dma write = %u\n", gus->gf1.interrupt_stat_dma_write);
115 snd_iprintf(buffer, "dma read = %u\n", gus->gf1.interrupt_stat_dma_read);
116 snd_iprintf(buffer, "voice lost = %u\n", gus->gf1.interrupt_stat_voice_lost);
117 for (idx = 0; idx < 32; idx++) {
118 pvoice = &gus->gf1.voices[idx];
119 snd_iprintf(buffer, "voice %i: wave = %u, volume = %u\n",
120 idx,
121 pvoice->interrupt_stat_wave,
122 pvoice->interrupt_stat_volume);
123 }
124 }
125
snd_gus_irq_profile_init(struct snd_gus_card * gus)126 void snd_gus_irq_profile_init(struct snd_gus_card *gus)
127 {
128 snd_card_ro_proc_new(gus->card, "gusirq", gus, snd_gus_irq_info_read);
129 }
130
131 #endif
132