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 <media/dmxdev.h>
32 #include <media/dvbdev.h>
33 #include <media/dvb_demux.h>
34 #include <media/dvb_frontend.h>
35 #include <media/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(risc_pos)		(risc_pos = 0)
47 #define RISC_INSTR(risc_pos, opcode)	(mantis->risc_cpu[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_DMA_TR_BYTES     (2 * 1024) /* upper limit: 4095 bytes. */
52 #define MANTIS_BLOCK_COUNT	(MANTIS_BUF_SIZE / MANTIS_BLOCK_BYTES)
53 
54 #define MANTIS_DMA_TR_UNITS     (MANTIS_BLOCK_BYTES / MANTIS_DMA_TR_BYTES)
55 /* MANTIS_BUF_SIZE / MANTIS_DMA_TR_UNITS must not exceed MANTIS_RISC_SIZE (4k RISC cmd buffer) */
56 #define MANTIS_RISC_SIZE	PAGE_SIZE /* RISC program must fit here. */
57 
58 int mantis_dma_exit(struct mantis_pci *mantis)
59 {
60 	if (mantis->buf_cpu) {
61 		dprintk(MANTIS_ERROR, 1,
62 			"DMA=0x%lx cpu=0x%p size=%d",
63 			(unsigned long) mantis->buf_dma,
64 			 mantis->buf_cpu,
65 			 MANTIS_BUF_SIZE);
66 
67 		pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE,
68 				    mantis->buf_cpu, mantis->buf_dma);
69 
70 		mantis->buf_cpu = NULL;
71 	}
72 	if (mantis->risc_cpu) {
73 		dprintk(MANTIS_ERROR, 1,
74 			"RISC=0x%lx cpu=0x%p size=%lx",
75 			(unsigned long) mantis->risc_dma,
76 			mantis->risc_cpu,
77 			MANTIS_RISC_SIZE);
78 
79 		pci_free_consistent(mantis->pdev, MANTIS_RISC_SIZE,
80 				    mantis->risc_cpu, mantis->risc_dma);
81 
82 		mantis->risc_cpu = NULL;
83 	}
84 
85 	return 0;
86 }
87 EXPORT_SYMBOL_GPL(mantis_dma_exit);
88 
89 static inline int mantis_alloc_buffers(struct mantis_pci *mantis)
90 {
91 	if (!mantis->buf_cpu) {
92 		mantis->buf_cpu = pci_alloc_consistent(mantis->pdev,
93 						       MANTIS_BUF_SIZE,
94 						       &mantis->buf_dma);
95 		if (!mantis->buf_cpu) {
96 			dprintk(MANTIS_ERROR, 1,
97 				"DMA buffer allocation failed");
98 
99 			goto err;
100 		}
101 		dprintk(MANTIS_ERROR, 1,
102 			"DMA=0x%lx cpu=0x%p size=%d",
103 			(unsigned long) mantis->buf_dma,
104 			mantis->buf_cpu, MANTIS_BUF_SIZE);
105 	}
106 	if (!mantis->risc_cpu) {
107 		mantis->risc_cpu = pci_alloc_consistent(mantis->pdev,
108 							MANTIS_RISC_SIZE,
109 							&mantis->risc_dma);
110 
111 		if (!mantis->risc_cpu) {
112 			dprintk(MANTIS_ERROR, 1,
113 				"RISC program allocation failed");
114 
115 			mantis_dma_exit(mantis);
116 
117 			goto err;
118 		}
119 		dprintk(MANTIS_ERROR, 1,
120 			"RISC=0x%lx cpu=0x%p size=%lx",
121 			(unsigned long) mantis->risc_dma,
122 			mantis->risc_cpu, MANTIS_RISC_SIZE);
123 	}
124 
125 	return 0;
126 err:
127 	dprintk(MANTIS_ERROR, 1, "Out of memory (?) .....");
128 	return -ENOMEM;
129 }
130 
131 int mantis_dma_init(struct mantis_pci *mantis)
132 {
133 	int err;
134 
135 	dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
136 	err = mantis_alloc_buffers(mantis);
137 	if (err < 0) {
138 		dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
139 
140 		/* Stop RISC Engine */
141 		mmwrite(0, MANTIS_DMA_CTL);
142 
143 		return err;
144 	}
145 
146 	return 0;
147 }
148 EXPORT_SYMBOL_GPL(mantis_dma_init);
149 
150 static inline void mantis_risc_program(struct mantis_pci *mantis)
151 {
152 	u32 buf_pos = 0;
153 	u32 line, step;
154 	u32 risc_pos;
155 
156 	dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
157 	RISC_FLUSH(risc_pos);
158 
159 	dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u, bytes per DMA tr %u",
160 		MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES);
161 
162 	for (line = 0; line < MANTIS_BLOCK_COUNT; line++) {
163 		for (step = 0; step < MANTIS_DMA_TR_UNITS; step++) {
164 			dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d], step=[%d]", line, step);
165 			if (step == 0) {
166 				RISC_INSTR(risc_pos, RISC_WRITE	|
167 					   RISC_IRQ	|
168 					   RISC_STATUS(line) |
169 					   MANTIS_DMA_TR_BYTES);
170 			} else {
171 				RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES);
172 			}
173 			RISC_INSTR(risc_pos, mantis->buf_dma + buf_pos);
174 			buf_pos += MANTIS_DMA_TR_BYTES;
175 		  }
176 	}
177 	RISC_INSTR(risc_pos, RISC_JUMP);
178 	RISC_INSTR(risc_pos, mantis->risc_dma);
179 }
180 
181 void mantis_dma_start(struct mantis_pci *mantis)
182 {
183 	dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine");
184 
185 	mantis_risc_program(mantis);
186 	mmwrite(mantis->risc_dma, MANTIS_RISC_START);
187 	mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);
188 
189 	mmwrite(0, MANTIS_DMA_CTL);
190 	mantis->last_block = mantis->busy_block = 0;
191 
192 	mantis_unmask_ints(mantis, MANTIS_INT_RISCI);
193 
194 	mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN
195 			       | MANTIS_RISC_EN, MANTIS_DMA_CTL);
196 
197 }
198 
199 void mantis_dma_stop(struct mantis_pci *mantis)
200 {
201 	dprintk(MANTIS_DEBUG, 1, "Mantis Stop DMA engine");
202 
203 	mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR);
204 
205 	mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN |
206 					    MANTIS_DCAP_EN |
207 					    MANTIS_RISC_EN)), MANTIS_DMA_CTL);
208 
209 	mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT);
210 
211 	mantis_mask_ints(mantis, MANTIS_INT_RISCI | MANTIS_INT_RISCEN);
212 }
213 
214 
215 void mantis_dma_xfer(unsigned long data)
216 {
217 	struct mantis_pci *mantis = (struct mantis_pci *) data;
218 	struct mantis_hwconfig *config = mantis->hwconfig;
219 
220 	while (mantis->last_block != mantis->busy_block) {
221 		dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
222 			mantis->last_block, mantis->busy_block);
223 
224 		(config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter)
225 		(&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES);
226 		mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT;
227 	}
228 }
229