drivers/ata/ahci_seattle.c

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

File Facts

System
Linux kernel
Corpus path
drivers/ata/ahci_seattle.c
Extension
.c
Size
5018 bytes
Lines
201
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 seattle_plat_data {
	void __iomem *sgpio_ctrl;
};

static struct ata_port_operations ahci_port_ops = {
	.inherits		= &ahci_ops,
};

static const struct ata_port_info ahci_port_info = {
	.flags		= AHCI_FLAG_COMMON,
	.pio_mask	= ATA_PIO4,
	.udma_mask	= ATA_UDMA6,
	.port_ops	= &ahci_port_ops,
};

static struct ata_port_operations ahci_seattle_ops = {
	.inherits		= &ahci_ops,
	.transmit_led_message   = seattle_transmit_led_message,
};

static const struct ata_port_info ahci_port_seattle_info = {
	.flags		= AHCI_FLAG_COMMON | ATA_FLAG_EM | ATA_FLAG_SW_ACTIVITY,
	.link_flags	= ATA_LFLAG_SW_ACTIVITY,
	.pio_mask	= ATA_PIO4,
	.udma_mask	= ATA_UDMA6,
	.port_ops	= &ahci_seattle_ops,
};

static const struct scsi_host_template ahci_platform_sht = {
	AHCI_SHT(DRV_NAME),
};

static ssize_t seattle_transmit_led_message(struct ata_port *ap, u32 state,
					    ssize_t size)
{
	struct ahci_host_priv *hpriv = ap->host->private_data;
	struct ahci_port_priv *pp = ap->private_data;
	struct seattle_plat_data *plat_data = hpriv->plat_data;
	unsigned long flags;
	int pmp;
	struct ahci_em_priv *emp;
	u32 val;

	/* get the slot number from the message */
	pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
	if (pmp >= EM_MAX_SLOTS)
		return -EINVAL;
	emp = &pp->em_priv[pmp];

	val = ioread32(plat_data->sgpio_ctrl);
	if (state & ACTIVITY_MASK)
		val |= 1 << ACTIVITY_BIT_POS((ap->port_no));
	else
		val &= ~(1 << ACTIVITY_BIT_POS((ap->port_no)));

	if (state & LOCATE_MASK)
		val |= 1 << LOCATE_BIT_POS((ap->port_no));
	else
		val &= ~(1 << LOCATE_BIT_POS((ap->port_no)));

	if (state & FAULT_MASK)
		val |= 1 << FAULT_BIT_POS((ap->port_no));
	else
		val &= ~(1 << FAULT_BIT_POS((ap->port_no)));

	iowrite32(val, plat_data->sgpio_ctrl);

	spin_lock_irqsave(ap->lock, flags);

	/* save off new led state for port/slot */
	emp->led_state = state;

	spin_unlock_irqrestore(ap->lock, flags);

	return size;
}

static const struct ata_port_info *ahci_seattle_get_port_info(
		struct platform_device *pdev, struct ahci_host_priv *hpriv)
{
	struct device *dev = &pdev->dev;
	struct seattle_plat_data *plat_data;
	u32 val;

	plat_data = devm_kzalloc(dev, sizeof(*plat_data), GFP_KERNEL);
	if (!plat_data)
		return &ahci_port_info;

	plat_data->sgpio_ctrl = devm_platform_ioremap_resource(pdev, 1);
	if (IS_ERR(plat_data->sgpio_ctrl))

Annotation

Implementation Notes