1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2015 VanguardiaSur - www.vanguardiasur.com.ar
4 *
5 * Copyright (C) 2015 Industrial Research Institute for Automation
6 * and Measurements PIAP
7 * Written by Krzysztof Ha?asa
8 */
9
10 #include <linux/mutex.h>
11 #include <linux/pci.h>
12 #include <linux/timer.h>
13 #include <linux/videodev2.h>
14 #include <media/v4l2-common.h>
15 #include <media/v4l2-ctrls.h>
16 #include <media/v4l2-device.h>
17 #include <media/v4l2-ioctl.h>
18 #include <media/videobuf2-v4l2.h>
19 #include <sound/pcm.h>
20
21 #include "tw686x-regs.h"
22
23 #define TYPE_MAX_CHANNELS 0x0f
24 #define TYPE_SECOND_GEN 0x10
25 #define TW686X_DEF_PHASE_REF 0x1518
26
27 #define TW686X_AUDIO_PAGE_MAX 16
28 #define TW686X_AUDIO_PERIODS_MIN 2
29 #define TW686X_AUDIO_PERIODS_MAX TW686X_AUDIO_PAGE_MAX
30
31 #define TW686X_DMA_MODE_MEMCPY 0
32 #define TW686X_DMA_MODE_CONTIG 1
33 #define TW686X_DMA_MODE_SG 2
34
35 struct tw686x_format {
36 char *name;
37 unsigned int fourcc;
38 unsigned int depth;
39 unsigned int mode;
40 };
41
42 struct tw686x_dma_desc {
43 dma_addr_t phys;
44 void *virt;
45 unsigned int size;
46 };
47
48 struct tw686x_sg_desc {
49 /* 3 MSBits for flags, 13 LSBits for length */
50 __le32 flags_length;
51 __le32 phys;
52 };
53
54 struct tw686x_audio_buf {
55 dma_addr_t dma;
56 void *virt;
57 struct list_head list;
58 };
59
60 struct tw686x_v4l2_buf {
61 struct vb2_v4l2_buffer vb;
62 struct list_head list;
63 };
64
65 struct tw686x_audio_channel {
66 struct tw686x_dev *dev;
67 struct snd_pcm_substream *ss;
68 unsigned int ch;
69 struct tw686x_audio_buf *curr_bufs[2];
70 struct tw686x_dma_desc dma_descs[2];
71 dma_addr_t ptr;
72
73 struct tw686x_audio_buf buf[TW686X_AUDIO_PAGE_MAX];
74 struct list_head buf_list;
75 spinlock_t lock;
76 };
77
78 struct tw686x_video_channel {
79 struct tw686x_dev *dev;
80
81 struct vb2_queue vidq;
82 struct list_head vidq_queued;
83 struct video_device *device;
84 struct tw686x_v4l2_buf *curr_bufs[2];
85 struct tw686x_dma_desc dma_descs[2];
86 struct tw686x_sg_desc *sg_descs[2];
87
88 struct v4l2_ctrl_handler ctrl_handler;
89 const struct tw686x_format *format;
90 struct mutex vb_mutex;
91 spinlock_t qlock;
92 v4l2_std_id video_standard;
93 unsigned int width, height;
94 unsigned int h_halve, v_halve;
95 unsigned int ch;
96 unsigned int num;
97 unsigned int fps;
98 unsigned int input;
99 unsigned int sequence;
100 unsigned int pb;
101 bool no_signal;
102 };
103
104 struct tw686x_dma_ops {
105 int (*setup)(struct tw686x_dev *dev);
106 int (*alloc)(struct tw686x_video_channel *vc, unsigned int pb);
107 void (*free)(struct tw686x_video_channel *vc, unsigned int pb);
108 void (*buf_refill)(struct tw686x_video_channel *vc, unsigned int pb);
109 const struct vb2_mem_ops *mem_ops;
110 enum v4l2_field field;
111 u32 hw_dma_mode;
112 };
113
114 /* struct tw686x_dev - global device status */
115 struct tw686x_dev {
116 /*
117 * spinlock controlling access to the shared device registers
118 * (DMA enable/disable)
119 */
120 spinlock_t lock;
121
122 struct v4l2_device v4l2_dev;
123 struct snd_card *snd_card;
124
125 char name[32];
126 unsigned int type;
127 unsigned int dma_mode;
128 struct pci_dev *pci_dev;
129 __u32 __iomem *mmio;
130
131 const struct tw686x_dma_ops *dma_ops;
132 struct tw686x_video_channel *video_channels;
133 struct tw686x_audio_channel *audio_channels;
134
135 /* Per-device audio parameters */
136 int audio_rate;
137 int period_size;
138 int audio_enabled;
139
140 struct timer_list dma_delay_timer;
141 u32 pending_dma_en; /* must be protected by lock */
142 u32 pending_dma_cmd; /* must be protected by lock */
143 };
144
reg_read(struct tw686x_dev * dev,unsigned int reg)145 static inline uint32_t reg_read(struct tw686x_dev *dev, unsigned int reg)
146 {
147 return readl(dev->mmio + reg);
148 }
149
reg_write(struct tw686x_dev * dev,unsigned int reg,uint32_t value)150 static inline void reg_write(struct tw686x_dev *dev, unsigned int reg,
151 uint32_t value)
152 {
153 writel(value, dev->mmio + reg);
154 }
155
max_channels(struct tw686x_dev * dev)156 static inline unsigned int max_channels(struct tw686x_dev *dev)
157 {
158 return dev->type & TYPE_MAX_CHANNELS; /* 4 or 8 channels */
159 }
160
is_second_gen(struct tw686x_dev * dev)161 static inline unsigned is_second_gen(struct tw686x_dev *dev)
162 {
163 /* each channel has its own DMA SG table */
164 return dev->type & TYPE_SECOND_GEN;
165 }
166
167 void tw686x_enable_channel(struct tw686x_dev *dev, unsigned int channel);
168 void tw686x_disable_channel(struct tw686x_dev *dev, unsigned int channel);
169
170 int tw686x_video_init(struct tw686x_dev *dev);
171 void tw686x_video_free(struct tw686x_dev *dev);
172 void tw686x_video_irq(struct tw686x_dev *dev, unsigned long requests,
173 unsigned int pb_status, unsigned int fifo_status,
174 unsigned int *reset_ch);
175
176 int tw686x_audio_init(struct tw686x_dev *dev);
177 void tw686x_audio_free(struct tw686x_dev *dev);
178 void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,
179 unsigned int pb_status);
180