drivers/net/wireless/st/cw1200/hwio.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/st/cw1200/hwio.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/st/cw1200/hwio.c
Extension
.c
Size
7236 bytes
Lines
310
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

if (!ret) {
			buf_id_rx = (buf_id_rx + 1) & 3;
			priv->buf_id_rx = buf_id_rx;
			break;
		} else {
			retry++;
			mdelay(1);
			pr_err("error :[%d]\n", ret);
		}
	}

	priv->hwbus_ops->unlock(priv->hwbus_priv);
	return ret;
}

int cw1200_data_write(struct cw1200_common *priv, const void *buf,
			size_t buf_len)
{
	int ret, retry = 1;
	int buf_id_tx = priv->buf_id_tx;

	priv->hwbus_ops->lock(priv->hwbus_priv);

	while (retry <= MAX_RETRY) {
		ret = __cw1200_reg_write(priv,
					 ST90TDS_IN_OUT_QUEUE_REG_ID, buf,
					 buf_len, buf_id_tx);
		if (!ret) {
			buf_id_tx = (buf_id_tx + 1) & 31;
			priv->buf_id_tx = buf_id_tx;
			break;
		} else {
			retry++;
			mdelay(1);
			pr_err("error :[%d]\n", ret);
		}
	}

	priv->hwbus_ops->unlock(priv->hwbus_priv);
	return ret;
}

int cw1200_indirect_read(struct cw1200_common *priv, u32 addr, void *buf,
			 size_t buf_len, u32 prefetch, u16 port_addr)
{
	u32 val32 = 0;
	int i, ret;

	if ((buf_len / 2) >= 0x1000) {
		pr_err("Can't read more than 0xfff words.\n");
		return -EINVAL;
	}

	priv->hwbus_ops->lock(priv->hwbus_priv);
	/* Write address */
	ret = __cw1200_reg_write_32(priv, ST90TDS_SRAM_BASE_ADDR_REG_ID, addr);
	if (ret < 0) {
		pr_err("Can't write address register.\n");
		goto out;
	}

	/* Read CONFIG Register Value - We will read 32 bits */
	ret = __cw1200_reg_read_32(priv, ST90TDS_CONFIG_REG_ID, &val32);
	if (ret < 0) {
		pr_err("Can't read config register.\n");
		goto out;
	}

	/* Set PREFETCH bit */
	ret = __cw1200_reg_write_32(priv, ST90TDS_CONFIG_REG_ID,
					val32 | prefetch);
	if (ret < 0) {
		pr_err("Can't write prefetch bit.\n");
		goto out;
	}

	/* Check for PRE-FETCH bit to be cleared */
	for (i = 0; i < 20; i++) {
		ret = __cw1200_reg_read_32(priv, ST90TDS_CONFIG_REG_ID, &val32);
		if (ret < 0) {
			pr_err("Can't check prefetch bit.\n");
			goto out;
		}
		if (!(val32 & prefetch))
			break;

		mdelay(i);
	}

	if (val32 & prefetch) {

Annotation

Implementation Notes