drivers/ata/pata_platform.c
Source file repositories/reference/linux-study-clean/drivers/ata/pata_platform.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/ata/pata_platform.c- Extension
.c- Size
- 6663 bytes
- Lines
- 239
- Domain
- Driver Families
- Bucket
- drivers/ata
- Inferred role
- Driver Families: exported/initcall integration point
- Status
- integration 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.
- 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.
- Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/kernel.hlinux/module.hlinux/blkdev.hscsi/scsi_host.hlinux/ata.hlinux/libata.hlinux/platform_device.hlinux/ata_platform.h
Detected Declarations
function set_modefunction ata_for_each_devfunction pata_platform_setup_portfunction __pata_platform_probefunction pata_platform_probeexport __pata_platform_probe
Annotated Snippet
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#include <linux/ata_platform.h>
#define DRV_NAME "pata_platform"
#define DRV_VERSION "1.2"
static int pio_mask = 1;
module_param(pio_mask, int, 0);
MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default");
/*
* Provide our own set_mode() as we don't want to change anything that has
* already been configured..
*/
static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
{
struct ata_device *dev;
ata_for_each_dev(dev, link, ENABLED) {
/* We don't really care */
dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
dev->xfer_shift = ATA_SHIFT_PIO;
dev->flags |= ATA_DFLAG_PIO;
ata_dev_info(dev, "configured for PIO\n");
}
return 0;
}
static const struct scsi_host_template pata_platform_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static void pata_platform_setup_port(struct ata_ioports *ioaddr,
unsigned int shift)
{
/* Fixup the port shift for platforms that need it */
ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
}
/**
* __pata_platform_probe - attach a platform interface
* @dev: device
* @io_res: Resource representing I/O base
* @ctl_res: Resource representing CTL base
* @irq_res: Resource representing IRQ and its flags
* @ioport_shift: I/O port shift
* @__pio_mask: PIO mask
* @sht: scsi_host_template to use when registering
* @use16bit: Flag to indicate 16-bit IO instead of 32-bit
*
* Register a platform bus IDE interface. Such interfaces are PIO and we
* assume do not support IRQ sharing.
*
* Platform devices are expected to contain at least 2 resources per port:
*
* - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
* - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
*
* and optionally:
*
* - IRQ (IORESOURCE_IRQ)
*
* If the base resources are both mem types, the ioremap() is handled
* here. For IORESOURCE_IO, it's assumed that there's no remapping
* necessary.
*
* If no IRQ resource is present, PIO polling mode is used instead.
*/
int __pata_platform_probe(struct device *dev, struct resource *io_res,
struct resource *ctl_res, struct resource *irq_res,
unsigned int ioport_shift, int __pio_mask,
const struct scsi_host_template *sht, bool use16bit)
{
struct ata_host *host;
struct ata_port *ap;
Annotation
- Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/blkdev.h`, `scsi/scsi_host.h`, `linux/ata.h`, `linux/libata.h`, `linux/platform_device.h`, `linux/ata_platform.h`.
- Detected declarations: `function set_mode`, `function ata_for_each_dev`, `function pata_platform_setup_port`, `function __pata_platform_probe`, `function pata_platform_probe`, `export __pata_platform_probe`.
- Atlas domain: Driver Families / drivers/ata.
- Implementation status: integration implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.