sound/soc/renesas/rcar/ssi.c

Source file repositories/reference/linux-study-clean/sound/soc/renesas/rcar/ssi.c

File Facts

System
Linux kernel
Corpus path
sound/soc/renesas/rcar/ssi.c
Extension
.c
Size
28822 bytes
Lines
1280
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: implementation source
Status
source 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 rsnd_ssi {
	struct rsnd_mod mod;

	u32 flags;
	u32 cr_own;
	u32 cr_clk;
	u32 cr_mode;
	u32 cr_en;
	u32 wsr;
	int chan;
	int rate;
	int irq;
	unsigned int usrcnt;

	/* for PIO */
	int byte_pos;
	int byte_per_period;
	int next_period_byte;
};

/* flags */
#define RSND_SSI_CLK_PIN_SHARE		(1 << 0)
#define RSND_SSI_NO_BUSIF		(1 << 1) /* SSI+DMA without BUSIF */
#define RSND_SSI_PROBED			(1 << 2)

#define for_each_rsnd_ssi(pos, priv, i)					\
	for (i = 0;							\
	     (i < rsnd_ssi_nr(priv)) &&					\
		((pos) = ((struct rsnd_ssi *)(priv)->ssi + i));		\
	     i++)

#define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id)
#define rsnd_ssi_nr(priv) ((priv)->ssi_nr)
#define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod)
#define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io))
#define rsnd_ssi_is_multi_secondary(mod, io)				\
	(rsnd_ssi_multi_secondaries(io) & (1 << rsnd_mod_id(mod)))
#define rsnd_ssi_is_run_mods(mod, io) \
	(rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod)))
#define rsnd_ssi_can_output_clk(mod) (!__rsnd_ssi_is_pin_sharing(mod))

int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
{
	struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	int use_busif = 0;

	if (!rsnd_ssi_is_dma_mode(mod))
		return 0;

	if (!(rsnd_flags_has(ssi, RSND_SSI_NO_BUSIF)))
		use_busif = 1;
	if (rsnd_io_to_mod_src(io))
		use_busif = 1;

	return use_busif;
}

static void rsnd_ssi_status_clear(struct rsnd_mod *mod)
{
	rsnd_mod_write(mod, SSISR, 0);
}

static u32 rsnd_ssi_status_get(struct rsnd_mod *mod)
{
	return rsnd_mod_read(mod, SSISR);
}

static void rsnd_ssi_status_check(struct rsnd_mod *mod,
				  u32 bit)
{
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	struct device *dev = rsnd_priv_to_dev(priv);
	u32 status;
	int i;

	for (i = 0; i < 1024; i++) {
		status = rsnd_ssi_status_get(mod);
		if (status & bit)
			return;

		udelay(5);
	}

	dev_warn(dev, "%s status check failed\n", rsnd_mod_name(mod));
}

static u32 rsnd_ssi_multi_secondaries(struct rsnd_dai_stream *io)
{
	static const enum rsnd_mod_type types[] = {

Annotation

Implementation Notes