1 /*
2 Mantis PCI bridge driver
3
4 Copyright (C) Manu Abraham (abraham.manu@gmail.com)
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., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include <linux/kernel.h>
22 #include <asm/page.h>
23 #include <linux/vmalloc.h>
24 #include <linux/pci.h>
25
26 #include <asm/irq.h>
27 #include <linux/signal.h>
28 #include <linux/sched.h>
29 #include <linux/interrupt.h>
30
31 #include "dmxdev.h"
32 #include "dvbdev.h"
33 #include "dvb_demux.h"
34 #include "dvb_frontend.h"
35 #include "dvb_net.h"
36
37 #include "mantis_common.h"
38 #include "mantis_reg.h"
39 #include "mantis_dma.h"
40
41 #define RISC_WRITE (0x01 << 28)
42 #define RISC_JUMP (0x07 << 28)
43 #define RISC_IRQ (0x01 << 24)
44
45 #define RISC_STATUS(status) ((((~status) & 0x0f) << 20) | ((status & 0x0f) << 16))
46 #define RISC_FLUSH() (mantis->risc_pos = 0)
47 #define RISC_INSTR(opcode) (mantis->risc_cpu[mantis->risc_pos++] = cpu_to_le32(opcode))
48
49 #define MANTIS_BUF_SIZE (64 * 1024)
50 #define MANTIS_BLOCK_BYTES (MANTIS_BUF_SIZE >> 4)
51 #define MANTIS_BLOCK_COUNT (1 << 4)
52 #define MANTIS_RISC_SIZE PAGE_SIZE
53
mantis_dma_exit(struct mantis_pci * mantis)54 int mantis_dma_exit(struct mantis_pci *mantis)
55 {
56 if (mantis->buf_cpu) {
57 dprintk(MANTIS_ERROR, 1,
58 "DMA=0x%lx cpu=0x%p size=%d",
59 (unsigned long) mantis->buf_dma,
60 mantis->buf_cpu,
61 MANTIS_BUF_SIZE);
62
63 pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE,
64 mantis->buf_cpu, mantis->buf_dma);
65
66 mantis->buf_cpu = NULL;
67 }
68 if (mantis->risc_cpu) {
69 dprintk(MANTIS_ERROR, 1,
70 "RISC=0x%lx cpu=0x%p size=%lx",
71 (unsigned long) mantis->risc_dma,
72 mantis->risc_cpu,
73 MANTIS_RISC_SIZE);
74
75 pci_free_consistent(mantis->pdev, MANTIS_RISC_SIZE,
76 mantis->risc_cpu, mantis->risc_dma);
77
78 mantis->risc_cpu = NULL;
79 }
80
81 return 0;
82 }
83 EXPORT_SYMBOL_GPL(mantis_dma_exit);
84
mantis_alloc_buffers(struct mantis_pci * mantis)85 static inline int mantis_alloc_buffers(struct mantis_pci *mantis)
86 {
87 if (!mantis->buf_cpu) {
88 mantis->buf_cpu = pci_alloc_consistent(mantis->pdev,
89 MANTIS_BUF_SIZE,
90 &mantis->buf_dma);
91 if (!mantis->buf_cpu) {
92 dprintk(MANTIS_ERROR, 1,
93 "DMA buffer allocation failed");
94
95 goto err;
96 }
97 dprintk(MANTIS_ERROR, 1,
98 "DMA=0x%lx cpu=0x%p size=%d",
99 (unsigned long) mantis->buf_dma,
100 mantis->buf_cpu, MANTIS_BUF_SIZE);
101 }
102 if (!mantis->risc_cpu) {
103 mantis->risc_cpu = pci_alloc_consistent(mantis->pdev,
104 MANTIS_RISC_SIZE,
105 &mantis->risc_dma);
106
107 if (!mantis->risc_cpu) {
108 dprintk(MANTIS_ERROR, 1,
109 "RISC program allocation failed");
110
111 mantis_dma_exit(mantis);
112
113 goto err;
114 }
115 dprintk(MANTIS_ERROR, 1,
116 "RISC=0x%lx cpu=0x%p size=%lx",
117 (unsigned long) mantis->risc_dma,
118 mantis->risc_cpu, MANTIS_RISC_SIZE);
119 }
120
121 return 0;
122 err:
123 dprintk(MANTIS_ERROR, 1, "Out of memory (?) .....");
124 return -ENOMEM;
125 }
126
mantis_calc_lines(struct mantis_pci * mantis)127 static inline int mantis_calc_lines(struct mantis_pci *mantis)
128 {
129 mantis->line_bytes = MANTIS_BLOCK_BYTES;
130 mantis->line_count = MANTIS_BLOCK_COUNT;
131
132 while (mantis->line_bytes > 4095) {
133 mantis->line_bytes >>= 1;
134 mantis->line_count <<= 1;
135 }
136
137 dprintk(MANTIS_DEBUG, 1, "Mantis RISC block bytes=[%d], line bytes=[%d], line count=[%d]",
138 MANTIS_BLOCK_BYTES, mantis->line_bytes, mantis->line_count);
139
140 if (mantis->line_count > 255) {
141 dprintk(MANTIS_ERROR, 1, "Buffer size error");
142 return -EINVAL;
143 }
144
145 return 0;
146 }
147
mantis_dma_init(struct mantis_pci * mantis)148 int mantis_dma_init(struct mantis_pci *mantis)
149 {
150 int err = 0;
151
152 dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
153 if (mantis_alloc_buffers(mantis) < 0) {
154 dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
155
156 /* Stop RISC Engine */
157 mmwrite(0, MANTIS_DMA_CTL);
158
159 goto err;
160 }
161 err = mantis_calc_lines(mantis);
162 if (err < 0) {
163 dprintk(MANTIS_ERROR, 1, "Mantis calc lines failed");
164
165 goto err;
166 }
167
168 return 0;
169 err:
170 return err;
171 }
172 EXPORT_SYMBOL_GPL(mantis_dma_init);
173
mantis_risc_program(struct mantis_pci * mantis)174 static inline void mantis_risc_program(struct mantis_pci *mantis)
175 {
176 u32 buf_pos = 0;
177 u32 line;
178
179 dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
180 RISC_FLUSH();
181
182 dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u",
183 mantis->line_count, mantis->line_bytes);
184
185 for (line = 0; line < mantis->line_count; line++) {
186 dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d]", line);
187 if (!(buf_pos % MANTIS_BLOCK_BYTES)) {
188 RISC_INSTR(RISC_WRITE |
189 RISC_IRQ |
190 RISC_STATUS(((buf_pos / MANTIS_BLOCK_BYTES) +
191 (MANTIS_BLOCK_COUNT - 1)) %
192 MANTIS_BLOCK_COUNT) |
193 mantis->line_bytes);
194 } else {
195 RISC_INSTR(RISC_WRITE | mantis->line_bytes);
196 }
197 RISC_INSTR(mantis->buf_dma + buf_pos);
198 buf_pos += mantis->line_bytes;
199 }
200 RISC_INSTR(RISC_JUMP);
201 RISC_INSTR(mantis->risc_dma);
202 }
203
mantis_dma_start(struct mantis_pci * mantis)204 void mantis_dma_start(struct mantis_pci *mantis)
205 {
206 dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine");
207
208 mantis_risc_program(mantis);
209 mmwrite(mantis->risc_dma, MANTIS_RISC_START);
210 mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);
211
212 mmwrite(0, MANTIS_DMA_CTL);
213 mantis->last_block = mantis->finished_block = 0;
214
215 mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_RISCI, MANTIS_INT_MASK);
216
217 mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN
218 | MANTIS_RISC_EN, MANTIS_DMA_CTL);
219
220 }
221
mantis_dma_stop(struct mantis_pci * mantis)222 void mantis_dma_stop(struct mantis_pci *mantis)
223 {
224 u32 stat = 0, mask = 0;
225
226 stat = mmread(MANTIS_INT_STAT);
227 mask = mmread(MANTIS_INT_MASK);
228 dprintk(MANTIS_DEBUG, 1, "Mantis Stop DMA engine");
229
230 mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR);
231
232 mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN |
233 MANTIS_DCAP_EN |
234 MANTIS_RISC_EN)), MANTIS_DMA_CTL);
235
236 mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT);
237
238 mmwrite(mmread(MANTIS_INT_MASK) & ~(MANTIS_INT_RISCI |
239 MANTIS_INT_RISCEN), MANTIS_INT_MASK);
240 }
241
242
mantis_dma_xfer(unsigned long data)243 void mantis_dma_xfer(unsigned long data)
244 {
245 struct mantis_pci *mantis = (struct mantis_pci *) data;
246 struct mantis_hwconfig *config = mantis->hwconfig;
247
248 while (mantis->last_block != mantis->finished_block) {
249 dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
250 mantis->last_block, mantis->finished_block);
251
252 (config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter)
253 (&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES);
254 mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT;
255 }
256 }
257