drivers/ata/sata_fsl.c

Source file repositories/reference/linux-study-clean/drivers/ata/sata_fsl.c

File Facts

System
Linux kernel
Corpus path
drivers/ata/sata_fsl.c
Extension
.c
Size
43407 bytes
Lines
1606
Domain
Driver Families
Bucket
drivers/ata
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 cmdhdr_tbl_entry {
	__le32 cda;
	__le32 prde_fis_len;
	__le32 ttl;
	__le32 desc_info;
};

/*
 * Description information bitdefs
 */
enum {
	CMD_DESC_RES = (1 << 11),
	VENDOR_SPECIFIC_BIST = (1 << 10),
	CMD_DESC_SNOOP_ENABLE = (1 << 9),
	FPDMA_QUEUED_CMD = (1 << 8),
	SRST_CMD = (1 << 7),
	BIST = (1 << 6),
	ATAPI_CMD = (1 << 5),
};

/*
 * Command Descriptor
 */
struct command_desc {
	u8 cfis[8 * 4];
	u8 sfis[8 * 4];
	struct_group(cdb,
		u8 acmd[4 * 4];
		u8 fill[4 * 4];
	);
	u32 prdt[SATA_FSL_MAX_PRD_DIRECT * 4];
	u32 prdt_indirect[(SATA_FSL_MAX_PRD - SATA_FSL_MAX_PRD_DIRECT) * 4];
};

/*
 * Physical region table descriptor(PRD)
 */

struct prde {
	__le32 dba;
	u8 fill[2 * 4];
	__le32 ddc_and_ext;
};

/*
 * ata_port private data
 * This is our per-port instance data.
 */
struct sata_fsl_port_priv {
	struct cmdhdr_tbl_entry *cmdslot;
	dma_addr_t cmdslot_paddr;
	struct command_desc *cmdentry;
	dma_addr_t cmdentry_paddr;
};

/*
 * ata_port->host_set private data
 */
struct sata_fsl_host_priv {
	void __iomem *hcr_base;
	void __iomem *ssr_base;
	void __iomem *csr_base;
	int irq;
	int data_snoop;
	struct device_attribute intr_coalescing;
	struct device_attribute rx_watermark;
};

static void fsl_sata_set_irq_coalescing(struct ata_host *host,
		unsigned int count, unsigned int ticks)
{
	struct sata_fsl_host_priv *host_priv = host->private_data;
	void __iomem *hcr_base = host_priv->hcr_base;
	unsigned long flags;

	if (count > ICC_MAX_INT_COUNT_THRESHOLD)
		count = ICC_MAX_INT_COUNT_THRESHOLD;
	else if (count < ICC_MIN_INT_COUNT_THRESHOLD)
		count = ICC_MIN_INT_COUNT_THRESHOLD;

	if (ticks > ICC_MAX_INT_TICKS_THRESHOLD)
		ticks = ICC_MAX_INT_TICKS_THRESHOLD;
	else if ((ICC_MIN_INT_TICKS_THRESHOLD == ticks) &&
			(count > ICC_MIN_INT_COUNT_THRESHOLD))
		ticks = ICC_SAFE_INT_TICKS;

	spin_lock_irqsave(&host->lock, flags);
	iowrite32((count << 24 | ticks), hcr_base + ICC);

	intr_coalescing_count = count;

Annotation

Implementation Notes