drivers/soc/ti/knav_dma.c

Source file repositories/reference/linux-study-clean/drivers/soc/ti/knav_dma.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/ti/knav_dma.c
Extension
.c
Size
20026 bytes
Lines
785
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct reg_global {
	u32	revision;
	u32	perf_control;
	u32	emulation_control;
	u32	priority_control;
	u32	qm_base_address[DMA_MAX_QMS];
};

struct reg_chan {
	u32	control;
	u32	mode;
	u32	__rsvd[6];
};

struct reg_tx_sched {
	u32	prio;
};

struct reg_rx_flow {
	u32	control;
	u32	tags;
	u32	tag_sel;
	u32	fdq_sel[2];
	u32	thresh[3];
};

struct knav_dma_pool_device {
	struct device			*dev;
	struct list_head		list;
};

struct knav_dma_device {
	bool				loopback, enable_all;
	unsigned			tx_priority, rx_priority, rx_timeout;
	unsigned			logical_queue_managers;
	unsigned			qm_base_address[DMA_MAX_QMS];
	struct reg_global __iomem	*reg_global;
	struct reg_chan __iomem		*reg_tx_chan;
	struct reg_rx_flow __iomem	*reg_rx_flow;
	struct reg_chan __iomem		*reg_rx_chan;
	struct reg_tx_sched __iomem	*reg_tx_sched;
	unsigned			max_rx_chan, max_tx_chan;
	unsigned			max_rx_flow;
	char				name[32];
	atomic_t			ref_count;
	struct list_head		list;
	struct list_head		chan_list;
	spinlock_t			lock;
};

struct knav_dma_chan {
	enum dma_transfer_direction	direction;
	struct knav_dma_device		*dma;
	atomic_t			ref_count;

	/* registers */
	struct reg_chan __iomem		*reg_chan;
	struct reg_tx_sched __iomem	*reg_tx_sched;
	struct reg_rx_flow __iomem	*reg_rx_flow;

	/* configuration stuff */
	unsigned			channel, flow;
	struct knav_dma_cfg		cfg;
	struct list_head		list;
	spinlock_t			lock;
};

#define chan_number(ch)	((ch->direction == DMA_MEM_TO_DEV) ? \
			ch->channel : ch->flow)

static struct knav_dma_pool_device *kdev;

static bool device_ready;
bool knav_dma_device_ready(void)
{
	return device_ready;
}
EXPORT_SYMBOL_GPL(knav_dma_device_ready);

static bool check_config(struct knav_dma_chan *chan, struct knav_dma_cfg *cfg)
{
	if (!memcmp(&chan->cfg, cfg, sizeof(*cfg)))
		return true;
	else
		return false;
}

static int chan_start(struct knav_dma_chan *chan,
			struct knav_dma_cfg *cfg)
{

Annotation

Implementation Notes