drivers/scsi/aic7xxx/aic79xx_pci.c

Source file repositories/reference/linux-study-clean/drivers/scsi/aic7xxx/aic79xx_pci.c

File Facts

System
Linux kernel
Corpus path
drivers/scsi/aic7xxx/aic79xx_pci.c
Extension
.c
Size
27447 bytes
Lines
1005
Domain
Driver Families
Bucket
drivers/scsi
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 (entry->full_id == (full_id & entry->id_mask)) {
			/* Honor exclusion entries. */
			if (entry->name == NULL)
				return (NULL);
			return (entry);
		}
	}
	return (NULL);
}

int
ahd_pci_config(struct ahd_softc *ahd, const struct ahd_pci_identity *entry)
{
	u_int		 command;
	uint32_t	 devconfig;
	uint16_t	 subvendor; 
	int		 error;

	ahd->description = entry->name;
	/*
	 * Record if this is an HP board.
	 */
	subvendor = ahd_pci_read_config(ahd->dev_softc,
					PCI_SUBSYSTEM_VENDOR_ID, /*bytes*/2);
	if (subvendor == SUBID_HP)
		ahd->flags |= AHD_HP_BOARD;

	error = entry->setup(ahd);
	if (error != 0)
		return (error);
	
	devconfig = ahd_pci_read_config(ahd->dev_softc, DEVCONFIG, /*bytes*/4);
	if ((devconfig & PCIXINITPAT) == PCIXINIT_PCI33_66) {
		ahd->chip |= AHD_PCI;
		/* Disable PCIX workarounds when running in PCI mode. */
		ahd->bugs &= ~AHD_PCIX_BUG_MASK;
	} else {
		ahd->chip |= AHD_PCIX;
	}
	ahd->bus_description = pci_bus_modes[PCI_BUS_MODES_INDEX(devconfig)];

	ahd_power_state_change(ahd, AHD_POWER_STATE_D0);

	error = ahd_pci_map_registers(ahd);
	if (error != 0)
		return (error);

	/*
	 * If we need to support high memory, enable dual
	 * address cycles.  This bit must be set to enable
	 * high address bit generation even if we are on a
	 * 64bit bus (PCI64BIT set in devconfig).
	 */
	if ((ahd->flags & (AHD_39BIT_ADDRESSING|AHD_64BIT_ADDRESSING)) != 0) {
		if (bootverbose)
			printk("%s: Enabling 39Bit Addressing\n",
			       ahd_name(ahd));
		devconfig = ahd_pci_read_config(ahd->dev_softc,
						DEVCONFIG, /*bytes*/4);
		devconfig |= DACEN;
		ahd_pci_write_config(ahd->dev_softc, DEVCONFIG,
				     devconfig, /*bytes*/4);
	}
	
	/* Ensure busmastering is enabled */
	command = ahd_pci_read_config(ahd->dev_softc, PCIR_COMMAND, /*bytes*/2);
	command |= PCIM_CMD_BUSMASTEREN;
	ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND, command, /*bytes*/2);

	error = ahd_softc_init(ahd);
	if (error != 0)
		return (error);

	ahd->bus_intr = ahd_pci_intr;

	error = ahd_reset(ahd, /*reinit*/FALSE);
	if (error != 0)
		return (ENXIO);

	ahd->pci_cachesize =
	    ahd_pci_read_config(ahd->dev_softc, CSIZE_LATTIME,
				/*bytes*/1) & CACHESIZE;
	ahd->pci_cachesize *= 4;

	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
	/* See if we have a SEEPROM and perform auto-term */
	error = ahd_check_extport(ahd);
	if (error != 0)
		return (error);

Annotation

Implementation Notes