drivers/ata/pata_parport/bpck6.c

Source file repositories/reference/linux-study-clean/drivers/ata/pata_parport/bpck6.c

File Facts

System
Linux kernel
Corpus path
drivers/ata/pata_parport/bpck6.c
Extension
.c
Size
12856 bytes
Lines
465
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

while (len--) {
			parport_write_data(pi->pardev->port, *buf++);
			parport_frob_control(pi->pardev->port, 0,
							PARPORT_CONTROL_INIT);
		}
		break;
	case PPCMODE_UNI_FW:
	case PPCMODE_BI_FW:
		bpck6_send_cmd(pi, CMD_PREFIX_SET | PREFIX_FASTWR);

		parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE,
							PARPORT_CONTROL_STROBE);

		last = *buf;

		parport_write_data(pi->pardev->port, last);

		while (len) {
			this = *buf++;
			len--;

			if (this == last) {
				parport_frob_control(pi->pardev->port, 0,
							PARPORT_CONTROL_INIT);
			} else {
				parport_write_data(pi->pardev->port, this);
				last = this;
			}
		}

		parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE,
							0);
		bpck6_send_cmd(pi, CMD_PREFIX_RESET | PREFIX_FASTWR);
		break;
	case PPCMODE_EPP_BYTE:
		pi->pardev->port->ops->epp_write_data(pi->pardev->port, buf,
						len, PARPORT_EPP_FAST_8);
		bpck6_wait_for_fifo(pi);
		break;
	case PPCMODE_EPP_WORD:
		pi->pardev->port->ops->epp_write_data(pi->pardev->port, buf,
						len, PARPORT_EPP_FAST_16);
		bpck6_wait_for_fifo(pi);
		break;
	case PPCMODE_EPP_DWORD:
		pi->pardev->port->ops->epp_write_data(pi->pardev->port, buf,
						len, PARPORT_EPP_FAST_32);
		bpck6_wait_for_fifo(pi);
		break;
	}

	bpck6_send_cmd(pi, CMD_PREFIX_RESET | PREFIX_IO16 | PREFIX_BLK);
}

static void bpck6_read_block(struct pi_adapter *pi, char *buf, int len)
{
	bpck6_send_cmd(pi, REG_BLKSIZE | ACCESS_REG | ACCESS_WRITE);
	bpck6_wr_data_byte(pi, (u8)len);
	bpck6_wr_data_byte(pi, (u8)(len >> 8));
	bpck6_wr_data_byte(pi, 0);

	bpck6_send_cmd(pi, CMD_PREFIX_SET | PREFIX_IO16 | PREFIX_BLK);
	bpck6_send_cmd(pi, ATA_REG_DATA | ACCESS_PORT | ACCESS_READ);

	switch (mode_map[pi->mode]) {
	case PPCMODE_UNI_SW:
	case PPCMODE_UNI_FW:
		while (len) {
			u8 d;

			parport_frob_control(pi->pardev->port,
					PARPORT_CONTROL_STROBE,
					PARPORT_CONTROL_INIT); /* DATA STROBE */
			d = parport_read_status(pi->pardev->port);
			d = ((d & 0x80) >> 1) | ((d & 0x38) >> 3);
			parport_frob_control(pi->pardev->port,
					PARPORT_CONTROL_STROBE,
					PARPORT_CONTROL_STROBE);
			d |= parport_read_status(pi->pardev->port) & 0xB8;
			*buf++ = d;
			len--;
		}
		break;
	case PPCMODE_BI_SW:
	case PPCMODE_BI_FW:
		parport_data_reverse(pi->pardev->port);
		while (len) {
			parport_frob_control(pi->pardev->port,
				PARPORT_CONTROL_STROBE,
				PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT);

Annotation

Implementation Notes