drivers/staging/media/atomisp/pci/hive_isp_css_common/host/isp.c

Source file repositories/reference/linux-study-clean/drivers/staging/media/atomisp/pci/hive_isp_css_common/host/isp.c

File Facts

System
Linux kernel
Corpus path
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/isp.c
Extension
.c
Size
1373 bytes
Lines
62
Domain
Driver Families
Bucket
drivers/staging
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

// SPDX-License-Identifier: GPL-2.0
/*
 * Support for Intel Camera Imaging ISP subsystem.
 * Copyright (c) 2010-2015, Intel Corporation.
 */

#include <linux/delay.h>

#include <system_global.h>
#include "isp.h"

#ifndef __INLINE_ISP__
#include "isp_private.h"
#endif /* __INLINE_ISP__ */

#include "assert_support.h"

void cnd_isp_irq_enable(
    const isp_ID_t		ID,
    const bool		cnd)
{
	if (cnd) {
		isp_ctrl_setbit(ID, ISP_IRQ_READY_REG, ISP_IRQ_READY_BIT);
		/* Enabling the IRQ immediately triggers an interrupt, clear it */
		isp_ctrl_setbit(ID, ISP_IRQ_CLEAR_REG, ISP_IRQ_CLEAR_BIT);
	} else {
		isp_ctrl_clearbit(ID, ISP_IRQ_READY_REG,
				  ISP_IRQ_READY_BIT);
	}
	return;
}

/* ISP functions to control the ISP state from the host, even in crun. */

/* Inspect readiness of an ISP indexed by ID */
unsigned int isp_is_ready(isp_ID_t ID)
{
	assert(ID < N_ISP_ID);
	return isp_ctrl_getbit(ID, ISP_SC_REG, ISP_IDLE_BIT);
}

/* Inspect sleeping of an ISP indexed by ID */
unsigned int isp_is_sleeping(isp_ID_t ID)
{
	assert(ID < N_ISP_ID);
	return isp_ctrl_getbit(ID, ISP_SC_REG, ISP_SLEEPING_BIT);
}

/* To be called by the host immediately before starting ISP ID. */
void isp_start(isp_ID_t ID)
{
	assert(ID < N_ISP_ID);
}

/* Wake up ISP ID. */
void isp_wake(isp_ID_t ID)
{
	assert(ID < N_ISP_ID);
	isp_ctrl_setbit(ID, ISP_SC_REG, ISP_START_BIT);
	udelay(1);
}

Annotation

Implementation Notes