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ata: add ata logical device to defer probe 

ata device usually take a long time to spin up, so it makes sense
to only spend this time when the device is actually used.

This adds a logical ata device and attaches a 'probe' parameter
to it, similar to what MMC does.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2013-03-08 10:14:05 +01:00
parent d80505569d
commit a2063d1015
2 changed files with 51 additions and 8 deletions
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57
drivers/ata/disk_ata_drive.c
View File

@ -255,17 +255,11 @@ static struct block_device_ops ata_ops = {
#endif
};
/**
* Register an ATA drive behind an IDE like interface
* @param dev The interface device
* @param io ATA register file description
* @return 0 on success
*/
int ata_port_register(struct ata_port *port)
static int ata_port_init(struct ata_port *port)
{
int rc;
struct ata_port_operations *ops = port->ops;
struct device_d *dev = port->dev;
struct device_d *dev = &port->class_dev;
port->id = dma_alloc(SECTOR_SIZE);
@ -325,6 +319,53 @@ on_error:
return rc;
}
static int ata_set_probe(struct device_d *class_dev, struct param_d *param,
const char *val)
{
struct ata_port *port = container_of(class_dev, struct ata_port, class_dev);
int ret, probe;
if (port->initialized) {
dev_info(class_dev, "already initialized\n");
return 0;
}
probe = !!simple_strtoul(val, NULL, 0);
if (!probe)
return 0;
ret = ata_port_init(port);
if (ret)
return ret;
port->initialized = 1;
return dev_param_set_generic(class_dev, param, "1");
}
/**
* Register an ATA drive behind an IDE like interface
* @param dev The interface device
* @param io ATA register file description
* @return 0 on success
*/
int ata_port_register(struct ata_port *port)
{
int ret;
port->class_dev.id = DEVICE_ID_DYNAMIC;
strcpy(port->class_dev.name, "ata");
port->class_dev.parent = port->dev;
ret = register_device(&port->class_dev);
if (ret)
return ret;
dev_add_param(&port->class_dev, "probe", ata_set_probe, NULL, 0);
return ret;
}
/**
* @file
* @brief Generic ATA disk drive support

2
include/ata_drive.h
View File

@ -89,9 +89,11 @@ struct ata_port_operations {
struct ata_port {
struct ata_port_operations *ops;
struct device_d *dev;
struct device_d class_dev;
void *drvdata;
struct block_device blk;
uint16_t *id;
int initialized;
};
int ide_port_register(struct device_d *, struct ata_ioports *);