aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/pci/mantis/mantis_dma.c
blob: 87990ece5848957baf4af40dd5100f356466b901 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
/*
	Mantis PCI bridge driver

	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/kernel.h>
#include <asm/page.h>
#include <linux/vmalloc.h>
#include <linux/pci.h>

#include <asm/irq.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>

#include "dmxdev.h"
#include "dvbdev.h"
#include "dvb_demux.h"
#include "dvb_frontend.h"
#include "dvb_net.h"

#include "mantis_common.h"
#include "mantis_reg.h"
#include "mantis_dma.h"

#define RISC_WRITE		(0x01 << 28)
#define RISC_JUMP		(0x07 << 28)
#define RISC_IRQ		(0x01 << 24)

#define RISC_STATUS(status)	((((~status) & 0x0f) << 20) | ((status & 0x0f) << 16))
#define RISC_FLUSH(risc_pos)		(risc_pos = 0)
#define RISC_INSTR(risc_pos, opcode)	(mantis->risc_cpu[risc_pos++] = cpu_to_le32(opcode))

#define MANTIS_BUF_SIZE		(64 * 1024)
#define MANTIS_BLOCK_BYTES      (MANTIS_BUF_SIZE / 4)
#define MANTIS_DMA_TR_BYTES     (2 * 1024) /* upper limit: 4095 bytes. */
#define MANTIS_BLOCK_COUNT	(MANTIS_BUF_SIZE / MANTIS_BLOCK_BYTES)

#define MANTIS_DMA_TR_UNITS     (MANTIS_BLOCK_BYTES / MANTIS_DMA_TR_BYTES)
/* MANTIS_BUF_SIZE / MANTIS_DMA_TR_UNITS must not exceed MANTIS_RISC_SIZE (4k RISC cmd buffer) */
#define MANTIS_RISC_SIZE	PAGE_SIZE /* RISC program must fit here. */

int mantis_dma_exit(struct mantis_pci *mantis)
{
	if (mantis->buf_cpu) {
		dprintk(MANTIS_ERROR, 1,
			"DMA=0x%lx cpu=0x%p size=%d",
			(unsigned long) mantis->buf_dma,
			 mantis->buf_cpu,
			 MANTIS_BUF_SIZE);

		pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE,
				    mantis->buf_cpu, mantis->buf_dma);

		mantis->buf_cpu = NULL;
	}
	if (mantis->risc_cpu) {
		dprintk(MANTIS_ERROR, 1,
			"RISC=0x%lx cpu=0x%p size=%lx",
			(unsigned long) mantis->risc_dma,
			mantis->risc_cpu,
			MANTIS_RISC_SIZE);

		pci_free_consistent(mantis->pdev, MANTIS_RISC_SIZE,
				    mantis->risc_cpu, mantis->risc_dma);

		mantis->risc_cpu = NULL;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(mantis_dma_exit);

static inline int mantis_alloc_buffers(struct mantis_pci *mantis)
{
	if (!mantis->buf_cpu) {
		mantis->buf_cpu = pci_alloc_consistent(mantis->pdev,
						       MANTIS_BUF_SIZE,
						       &mantis->buf_dma);
		if (!mantis->buf_cpu) {
			dprintk(MANTIS_ERROR, 1,
				"DMA buffer allocation failed");

			goto err;
		}
		dprintk(MANTIS_ERROR, 1,
			"DMA=0x%lx cpu=0x%p size=%d",
			(unsigned long) mantis->buf_dma,
			mantis->buf_cpu, MANTIS_BUF_SIZE);
	}
	if (!mantis->risc_cpu) {
		mantis->risc_cpu = pci_alloc_consistent(mantis->pdev,
							MANTIS_RISC_SIZE,
							&mantis->risc_dma);

		if (!mantis->risc_cpu) {
			dprintk(MANTIS_ERROR, 1,
				"RISC program allocation failed");

			mantis_dma_exit(mantis);

			goto err;
		}
		dprintk(MANTIS_ERROR, 1,
			"RISC=0x%lx cpu=0x%p size=%lx",
			(unsigned long) mantis->risc_dma,
			mantis->risc_cpu, MANTIS_RISC_SIZE);
	}

	return 0;
err:
	dprintk(MANTIS_ERROR, 1, "Out of memory (?) .....");
	return -ENOMEM;
}

int mantis_dma_init(struct mantis_pci *mantis)
{
	int err;

	dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
	err = mantis_alloc_buffers(mantis);
	if (err < 0) {
		dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");

		/* Stop RISC Engine */
		mmwrite(0, MANTIS_DMA_CTL);

		goto err;
	}

	return 0;
err:
	return err;
}
EXPORT_SYMBOL_GPL(mantis_dma_init);

static inline void mantis_risc_program(struct mantis_pci *mantis)
{
	u32 buf_pos = 0;
	u32 line, step;
	u32 risc_pos;

	dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
	RISC_FLUSH(risc_pos);

	dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u, bytes per DMA tr %u",
		MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES);

	for (line = 0; line < MANTIS_BLOCK_COUNT; line++) {
		for (step = 0; step < MANTIS_DMA_TR_UNITS; step++) {
			dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d], step=[%d]", line, step);
			if (step == 0) {
				RISC_INSTR(risc_pos, RISC_WRITE	|
					   RISC_IRQ	|
					   RISC_STATUS(line) |
					   MANTIS_DMA_TR_BYTES);
			} else {
				RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES);
			}
			RISC_INSTR(risc_pos, mantis->buf_dma + buf_pos);
			buf_pos += MANTIS_DMA_TR_BYTES;
		  }
	}
	RISC_INSTR(risc_pos, RISC_JUMP);
	RISC_INSTR(risc_pos, mantis->risc_dma);
}

void mantis_dma_start(struct mantis_pci *mantis)
{
	dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine");

	mantis_risc_program(mantis);
	mmwrite(mantis->risc_dma, MANTIS_RISC_START);
	mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);

	mmwrite(0, MANTIS_DMA_CTL);
	mantis->last_block = mantis->busy_block = 0;

	mantis_unmask_ints(mantis, MANTIS_INT_RISCI);

	mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN
			       | MANTIS_RISC_EN, MANTIS_DMA_CTL);

}

void mantis_dma_stop(struct mantis_pci *mantis)
{
	dprintk(MANTIS_DEBUG, 1, "Mantis Stop DMA engine");

	mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR);

	mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN |
					    MANTIS_DCAP_EN |
					    MANTIS_RISC_EN)), MANTIS_DMA_CTL);

	mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT);

	mantis_mask_ints(mantis, MANTIS_INT_RISCI | MANTIS_INT_RISCEN);
}


void mantis_dma_xfer(unsigned long data)
{
	struct mantis_pci *mantis = (struct mantis_pci *) data;
	struct mantis_hwconfig *config = mantis->hwconfig;

	while (mantis->last_block != mantis->busy_block) {
		dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
			mantis->last_block, mantis->busy_block);

		(config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter)
		(&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES);
		mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT;
	}
}

Privacy Policy