V4L/DVB (9475): cx18: Disable write retries for registers that always change - part 1.
[pandora-kernel.git] / drivers / media / video / cx18 / cx18-irq.c
1 /*
2  *  cx18 interrupt handling
3  *
4  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
5  *
6  *  This program is free software; you can redistribute it and/or modify
7  *  it under the terms of the GNU General Public License as published by
8  *  the Free Software Foundation; either version 2 of the License, or
9  *  (at your option) any later version.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19  *  02111-1307  USA
20  */
21
22 #include "cx18-driver.h"
23 #include "cx18-io.h"
24 #include "cx18-firmware.h"
25 #include "cx18-fileops.h"
26 #include "cx18-queue.h"
27 #include "cx18-irq.h"
28 #include "cx18-ioctl.h"
29 #include "cx18-mailbox.h"
30 #include "cx18-vbi.h"
31 #include "cx18-scb.h"
32
33 #define DMA_MAGIC_COOKIE 0x000001fe
34
35 static void epu_dma_done(struct cx18 *cx, struct cx18_mailbox *mb)
36 {
37         u32 handle = mb->args[0];
38         struct cx18_stream *s = NULL;
39         struct cx18_buffer *buf;
40         u32 off;
41         int i;
42         int id;
43
44         for (i = 0; i < CX18_MAX_STREAMS; i++) {
45                 s = &cx->streams[i];
46                 if ((handle == s->handle) && (s->dvb.enabled))
47                         break;
48                 if (s->v4l2dev && handle == s->handle)
49                         break;
50         }
51         if (i == CX18_MAX_STREAMS) {
52                 CX18_WARN("Got DMA done notification for unknown/inactive"
53                           " handle %d\n", handle);
54                 mb->error = CXERR_NOT_OPEN;
55                 mb->cmd = 0;
56                 cx18_mb_ack(cx, mb);
57                 return;
58         }
59
60         off = mb->args[1];
61         if (mb->args[2] != 1)
62                 CX18_WARN("Ack struct = %d for %s\n",
63                         mb->args[2], s->name);
64         id = cx18_read_enc(cx, off);
65         buf = cx18_queue_get_buf_irq(s, id, cx18_read_enc(cx, off + 4));
66         CX18_DEBUG_HI_DMA("DMA DONE for %s (buffer %d)\n", s->name, id);
67         if (buf) {
68                 cx18_buf_sync_for_cpu(s, buf);
69                 if (s->type == CX18_ENC_STREAM_TYPE_TS && s->dvb.enabled) {
70                         /* process the buffer here */
71                         CX18_DEBUG_HI_DMA("TS recv and sent bytesused=%d\n",
72                                         buf->bytesused);
73
74                         dvb_dmx_swfilter(&s->dvb.demux, buf->buf,
75                                         buf->bytesused);
76
77                         cx18_buf_sync_for_device(s, buf);
78                         cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, s->handle,
79                             (void __iomem *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
80                             1, buf->id, s->buf_size);
81                 } else
82                         set_bit(CX18_F_B_NEED_BUF_SWAP, &buf->b_flags);
83         } else {
84                 CX18_WARN("Could not find buf %d for stream %s\n",
85                                 cx18_read_enc(cx, off), s->name);
86         }
87         mb->error = 0;
88         mb->cmd = 0;
89         cx18_mb_ack(cx, mb);
90         wake_up(&cx->dma_waitq);
91         if (s->id != -1)
92                 wake_up(&s->waitq);
93 }
94
95 static void epu_debug(struct cx18 *cx, struct cx18_mailbox *mb)
96 {
97         char str[256] = { 0 };
98         char *p;
99
100         if (mb->args[1]) {
101                 cx18_setup_page(cx, mb->args[1]);
102                 cx18_memcpy_fromio(cx, str, cx->enc_mem + mb->args[1], 252);
103                 str[252] = 0;
104         }
105         cx18_mb_ack(cx, mb);
106         CX18_DEBUG_INFO("%x %s\n", mb->args[0], str);
107         p = strchr(str, '.');
108         if (!test_bit(CX18_F_I_LOADED_FW, &cx->i_flags) && p && p > str)
109                 CX18_INFO("FW version: %s\n", p - 1);
110 }
111
112 static void hpu_cmd(struct cx18 *cx, u32 sw1)
113 {
114         struct cx18_mailbox mb;
115
116         if (sw1 & IRQ_CPU_TO_EPU) {
117                 cx18_memcpy_fromio(cx, &mb, &cx->scb->cpu2epu_mb, sizeof(mb));
118                 mb.error = 0;
119
120                 switch (mb.cmd) {
121                 case CX18_EPU_DMA_DONE:
122                         epu_dma_done(cx, &mb);
123                         break;
124                 case CX18_EPU_DEBUG:
125                         epu_debug(cx, &mb);
126                         break;
127                 default:
128                         CX18_WARN("Unexpected mailbox command %08x\n", mb.cmd);
129                         break;
130                 }
131         }
132         if (sw1 & (IRQ_APU_TO_EPU | IRQ_HPU_TO_EPU))
133                 CX18_WARN("Unexpected interrupt %08x\n", sw1);
134 }
135
136 irqreturn_t cx18_irq_handler(int irq, void *dev_id)
137 {
138         struct cx18 *cx = (struct cx18 *)dev_id;
139         u32 sw1, sw1_mask;
140         u32 sw2, sw2_mask;
141         u32 hw2, hw2_mask;
142
143         spin_lock(&cx->dma_reg_lock);
144
145         hw2_mask = cx18_read_reg(cx, HW2_INT_MASK5_PCI);
146         hw2 = cx18_read_reg(cx, HW2_INT_CLR_STATUS) & hw2_mask;
147         sw2_mask = cx18_read_reg(cx, SW2_INT_ENABLE_PCI) | IRQ_EPU_TO_HPU_ACK;
148         sw2 = cx18_read_reg(cx, SW2_INT_STATUS) & sw2_mask;
149         sw1_mask = cx18_read_reg(cx, SW1_INT_ENABLE_PCI) | IRQ_EPU_TO_HPU;
150         sw1 = cx18_read_reg(cx, SW1_INT_STATUS) & sw1_mask;
151
152         cx18_write_reg_noretry(cx, sw2&sw2_mask, SW2_INT_STATUS);
153         cx18_write_reg_noretry(cx, sw1&sw1_mask, SW1_INT_STATUS);
154         cx18_write_reg_noretry(cx, hw2&hw2_mask, HW2_INT_CLR_STATUS);
155
156         if (sw1 || sw2 || hw2)
157                 CX18_DEBUG_HI_IRQ("SW1: %x  SW2: %x  HW2: %x\n", sw1, sw2, hw2);
158
159         /* To do: interrupt-based I2C handling
160         if (hw2 & 0x00c00000) {
161         }
162         */
163
164         if (sw2) {
165                 if (sw2 & (cx18_readl(cx, &cx->scb->cpu2hpu_irq_ack) |
166                            cx18_readl(cx, &cx->scb->cpu2epu_irq_ack)))
167                         wake_up(&cx->mb_cpu_waitq);
168                 if (sw2 & (cx18_readl(cx, &cx->scb->apu2hpu_irq_ack) |
169                            cx18_readl(cx, &cx->scb->apu2epu_irq_ack)))
170                         wake_up(&cx->mb_apu_waitq);
171                 if (sw2 & cx18_readl(cx, &cx->scb->epu2hpu_irq_ack))
172                         wake_up(&cx->mb_epu_waitq);
173                 if (sw2 & cx18_readl(cx, &cx->scb->hpu2epu_irq_ack))
174                         wake_up(&cx->mb_hpu_waitq);
175         }
176
177         if (sw1)
178                 hpu_cmd(cx, sw1);
179         spin_unlock(&cx->dma_reg_lock);
180
181         return (hw2 | sw1 | sw2) ? IRQ_HANDLED : IRQ_NONE;
182 }