drivers/scsi/qlogicpti.c

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

File Facts

System
Linux kernel
Corpus path
drivers/scsi/qlogicpti.c
Extension
.c
Size
40976 bytes
Lines
1476
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 (qpti->ultra) {
			qpti->dev_param[i].synchronous_period = 12;
			qpti->dev_param[i].synchronous_offset = 8;
		} else {
			qpti->dev_param[i].synchronous_period = 25;
			qpti->dev_param[i].synchronous_offset = 12;
		}
		qpti->dev_param[i].device_enable = 1;
	}
}

static int qlogicpti_reset_hardware(struct Scsi_Host *host)
{
	struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
	u_short param[6];
	unsigned short risc_code_addr;
	int loop_count, i;
	unsigned long flags;

	risc_code_addr = 0x1000;	/* all load addresses are at 0x1000 */

	spin_lock_irqsave(host->host_lock, flags);

	sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);

	/* Only reset the scsi bus if it is not free. */
	if (sbus_readw(qpti->qregs + CPU_PCTRL) & CPU_PCTRL_BSY) {
		sbus_writew(CPU_ORIDE_RMOD, qpti->qregs + CPU_ORIDE);
		sbus_writew(CPU_CMD_BRESET, qpti->qregs + CPU_CMD);
		udelay(400);
	}

	sbus_writew(SBUS_CTRL_RESET, qpti->qregs + SBUS_CTRL);
	sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + CMD_DMA_CTRL);
	sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + DATA_DMA_CTRL);

	loop_count = DEFAULT_LOOP_COUNT;
	while (--loop_count && ((sbus_readw(qpti->qregs + MBOX0) & 0xff) == 0x04))
		udelay(20);
	if (!loop_count)
		printk(KERN_EMERG "qlogicpti%d: reset_hardware loop timeout\n",
		       qpti->qpti_id);

	sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
	set_sbus_cfg1(qpti);
	qlogicpti_enable_irqs(qpti);

	if (sbus_readw(qpti->qregs + RISC_PSR) & RISC_PSR_ULTRA) {
		qpti->ultra = 1;
		sbus_writew((RISC_MTREG_P0ULTRA | RISC_MTREG_P1ULTRA),
			    qpti->qregs + RISC_MTREG);
	} else {
		qpti->ultra = 0;
		sbus_writew((RISC_MTREG_P0DFLT | RISC_MTREG_P1DFLT),
			    qpti->qregs + RISC_MTREG);
	}

	/* reset adapter and per-device default values. */
	/* do it after finding out whether we're ultra mode capable */
	qlogicpti_set_hostdev_defaults(qpti);

	/* Release the RISC processor. */
	sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

	/* Get RISC to start executing the firmware code. */
	param[0] = MBOX_EXEC_FIRMWARE;
	param[1] = risc_code_addr;
	if (qlogicpti_mbox_command(qpti, param, 1)) {
		printk(KERN_EMERG "qlogicpti%d: Cannot execute ISP firmware.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	/* Set initiator scsi ID. */
	param[0] = MBOX_SET_INIT_SCSI_ID;
	param[1] = qpti->host_param.initiator_scsi_id;
	if (qlogicpti_mbox_command(qpti, param, 1) ||
	   (param[0] != MBOX_COMMAND_COMPLETE)) {
		printk(KERN_EMERG "qlogicpti%d: Cannot set initiator SCSI ID.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	/* Initialize state of the queues, both hw and sw. */
	qpti->req_in_ptr = qpti->res_out_ptr = 0;

	param[0] = MBOX_INIT_RES_QUEUE;
	param[1] = RES_QUEUE_LEN + 1;

Annotation

Implementation Notes