drivers/net/wireless/silabs/wfx/bus_sdio.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/silabs/wfx/bus_sdio.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/silabs/wfx/bus_sdio.c
Extension
.c
Size
7985 bytes
Lines
327
Domain
Driver Families
Bucket
drivers/net
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 wfx_sdio_priv {
	struct sdio_func *func;
	struct wfx_dev *core;
	u8 buf_id_tx;
	u8 buf_id_rx;
	int of_irq;
};

static int wfx_sdio_copy_from_io(void *priv, unsigned int reg_id, void *dst, size_t count)
{
	struct wfx_sdio_priv *bus = priv;
	unsigned int sdio_addr = reg_id << 2;
	int ret;

	WARN(reg_id > 7, "chip only has 7 registers");
	WARN(!IS_ALIGNED((uintptr_t)dst, 4), "unaligned buffer address");
	WARN(!IS_ALIGNED(count, 4), "unaligned buffer size");

	/* Use queue mode buffers */
	if (reg_id == WFX_REG_IN_OUT_QUEUE)
		sdio_addr |= (bus->buf_id_rx + 1) << 7;
	ret = sdio_memcpy_fromio(bus->func, dst, sdio_addr, count);
	if (!ret && reg_id == WFX_REG_IN_OUT_QUEUE)
		bus->buf_id_rx = (bus->buf_id_rx + 1) % 4;

	return ret;
}

static int wfx_sdio_copy_to_io(void *priv, unsigned int reg_id, const void *src, size_t count)
{
	struct wfx_sdio_priv *bus = priv;
	unsigned int sdio_addr = reg_id << 2;
	int ret;

	WARN(reg_id > 7, "chip only has 7 registers");
	WARN(!IS_ALIGNED((uintptr_t)src, 4), "unaligned buffer address");
	WARN(!IS_ALIGNED(count, 4), "unaligned buffer size");

	/* Use queue mode buffers */
	if (reg_id == WFX_REG_IN_OUT_QUEUE)
		sdio_addr |= bus->buf_id_tx << 7;
	/* FIXME: discards 'const' qualifier for src */
	ret = sdio_memcpy_toio(bus->func, sdio_addr, (void *)src, count);
	if (!ret && reg_id == WFX_REG_IN_OUT_QUEUE)
		bus->buf_id_tx = (bus->buf_id_tx + 1) % 32;

	return ret;
}

static void wfx_sdio_lock(void *priv)
{
	struct wfx_sdio_priv *bus = priv;

	sdio_claim_host(bus->func);
}

static void wfx_sdio_unlock(void *priv)
{
	struct wfx_sdio_priv *bus = priv;

	sdio_release_host(bus->func);
}

static void wfx_sdio_irq_handler(struct sdio_func *func)
{
	struct wfx_sdio_priv *bus = sdio_get_drvdata(func);

	wfx_bh_request_rx(bus->core);
}

static irqreturn_t wfx_sdio_irq_handler_ext(int irq, void *priv)
{
	struct wfx_sdio_priv *bus = priv;

	sdio_claim_host(bus->func);
	wfx_bh_request_rx(bus->core);
	sdio_release_host(bus->func);
	return IRQ_HANDLED;
}

static int wfx_sdio_irq_subscribe(void *priv)
{
	struct wfx_sdio_priv *bus = priv;
	u32 flags;
	int ret;
	u8 cccr;

	if (!bus->of_irq) {
		sdio_claim_host(bus->func);
		ret = sdio_claim_irq(bus->func, wfx_sdio_irq_handler);

Annotation

Implementation Notes