drivers/soc/fsl/qe/usb.c

Source file repositories/reference/linux-study-clean/drivers/soc/fsl/qe/usb.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/fsl/qe/usb.c
Extension
.c
Size
1517 bytes
Lines
53
Domain
Driver Families
Bucket
drivers/soc
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * QE USB routines
 *
 * Copyright 2006 Freescale Semiconductor, Inc.
 *               Shlomi Gridish <gridish@freescale.com>
 *               Jerry Huang <Chang-Ming.Huang@freescale.com>
 * Copyright (c) MontaVista Software, Inc. 2008.
 *               Anton Vorontsov <avorontsov@ru.mvista.com>
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/io.h>
#include <soc/fsl/qe/immap_qe.h>
#include <soc/fsl/qe/qe.h>

int qe_usb_clock_set(enum qe_clock clk, int rate)
{
	struct qe_mux __iomem *mux = &qe_immr->qmx;
	unsigned long flags;
	u32 val;

	switch (clk) {
	case QE_CLK3:  val = QE_CMXGCR_USBCS_CLK3;  break;
	case QE_CLK5:  val = QE_CMXGCR_USBCS_CLK5;  break;
	case QE_CLK7:  val = QE_CMXGCR_USBCS_CLK7;  break;
	case QE_CLK9:  val = QE_CMXGCR_USBCS_CLK9;  break;
	case QE_CLK13: val = QE_CMXGCR_USBCS_CLK13; break;
	case QE_CLK17: val = QE_CMXGCR_USBCS_CLK17; break;
	case QE_CLK19: val = QE_CMXGCR_USBCS_CLK19; break;
	case QE_CLK21: val = QE_CMXGCR_USBCS_CLK21; break;
	case QE_BRG9:  val = QE_CMXGCR_USBCS_BRG9;  break;
	case QE_BRG10: val = QE_CMXGCR_USBCS_BRG10; break;
	default:
		pr_err("%s: requested unknown clock %d\n", __func__, clk);
		return -EINVAL;
	}

	if (qe_clock_is_brg(clk))
		qe_setbrg(clk, rate, 1);

	spin_lock_irqsave(&cmxgcr_lock, flags);

	qe_clrsetbits_be32(&mux->cmxgcr, QE_CMXGCR_USBCS, val);

	spin_unlock_irqrestore(&cmxgcr_lock, flags);

	return 0;
}
EXPORT_SYMBOL(qe_usb_clock_set);

Annotation

Implementation Notes