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
 35struct tw686x_format {
 36	char *name;
 37	unsigned int fourcc;
 38	unsigned int depth;
 39	unsigned int mode;
 40};
 41
 42struct tw686x_dma_desc {
 43	dma_addr_t phys;
 44	void *virt;
 45	unsigned int size;
 46};
 47
 48struct tw686x_sg_desc {
 49	/* 3 MSBits for flags, 13 LSBits for length */
 50	__le32 flags_length;
 51	__le32 phys;
 52};
 53
 54struct tw686x_audio_buf {
 55	dma_addr_t dma;
 56	void *virt;
 57	struct list_head list;
 58};
 59
 60struct tw686x_v4l2_buf {
 61	struct vb2_v4l2_buffer vb;
 62	struct list_head list;
 63};
 64
 65struct 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
 78struct 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
104struct 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 */
115struct 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
145static inline uint32_t reg_read(struct tw686x_dev *dev, unsigned int reg)
146{
147	return readl(dev->mmio + reg);
148}
149
150static inline void reg_write(struct tw686x_dev *dev, unsigned int reg,
151			     uint32_t value)
152{
153	writel(value, dev->mmio + reg);
154}
155
156static inline unsigned int max_channels(struct tw686x_dev *dev)
157{
158	return dev->type & TYPE_MAX_CHANNELS; /* 4 or 8 channels */
159}
160
161static 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
167void tw686x_enable_channel(struct tw686x_dev *dev, unsigned int channel);
168void tw686x_disable_channel(struct tw686x_dev *dev, unsigned int channel);
169
170int tw686x_video_init(struct tw686x_dev *dev);
171void tw686x_video_free(struct tw686x_dev *dev);
172void 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
176int tw686x_audio_init(struct tw686x_dev *dev);
177void tw686x_audio_free(struct tw686x_dev *dev);
178void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests,
179		      unsigned int pb_status);