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