drivers/media/pci/cx18/cx18-io.c

Source file repositories/reference/linux-study-clean/drivers/media/pci/cx18/cx18-io.c

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/cx18/cx18-io.c
Extension
.c
Size
2130 bytes
Lines
84
Domain
Driver Families
Bucket
drivers/media
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-or-later
/*
 *  cx18 driver PCI memory mapped IO access routines
 *
 *  Copyright (C) 2007  Hans Verkuil <hverkuil@kernel.org>
 *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
 */

#include "cx18-driver.h"
#include "cx18-io.h"
#include "cx18-irq.h"

void cx18_memset_io(struct cx18 *cx, void __iomem *addr, int val, size_t count)
{
	u8 __iomem *dst = addr;
	u16 val2 = val | (val << 8);
	u32 val4 = val2 | (val2 << 16);

	/* Align writes on the CX23418's addresses */
	if ((count > 0) && ((unsigned long)dst & 1)) {
		cx18_writeb(cx, (u8) val, dst);
		count--;
		dst++;
	}
	if ((count > 1) && ((unsigned long)dst & 2)) {
		cx18_writew(cx, val2, dst);
		count -= 2;
		dst += 2;
	}
	while (count > 3) {
		cx18_writel(cx, val4, dst);
		count -= 4;
		dst += 4;
	}
	if (count > 1) {
		cx18_writew(cx, val2, dst);
		count -= 2;
		dst += 2;
	}
	if (count > 0)
		cx18_writeb(cx, (u8) val, dst);
}

void cx18_sw1_irq_enable(struct cx18 *cx, u32 val)
{
	cx18_write_reg_expect(cx, val, SW1_INT_STATUS, ~val, val);
	cx->sw1_irq_mask = cx18_read_reg(cx, SW1_INT_ENABLE_PCI) | val;
	cx18_write_reg(cx, cx->sw1_irq_mask, SW1_INT_ENABLE_PCI);
}

void cx18_sw1_irq_disable(struct cx18 *cx, u32 val)
{
	cx->sw1_irq_mask = cx18_read_reg(cx, SW1_INT_ENABLE_PCI) & ~val;
	cx18_write_reg(cx, cx->sw1_irq_mask, SW1_INT_ENABLE_PCI);
}

void cx18_sw2_irq_enable(struct cx18 *cx, u32 val)
{
	cx18_write_reg_expect(cx, val, SW2_INT_STATUS, ~val, val);
	cx->sw2_irq_mask = cx18_read_reg(cx, SW2_INT_ENABLE_PCI) | val;
	cx18_write_reg(cx, cx->sw2_irq_mask, SW2_INT_ENABLE_PCI);
}

void cx18_sw2_irq_disable(struct cx18 *cx, u32 val)
{
	cx->sw2_irq_mask = cx18_read_reg(cx, SW2_INT_ENABLE_PCI) & ~val;
	cx18_write_reg(cx, cx->sw2_irq_mask, SW2_INT_ENABLE_PCI);
}

void cx18_sw2_irq_disable_cpu(struct cx18 *cx, u32 val)
{
	u32 r;
	r = cx18_read_reg(cx, SW2_INT_ENABLE_CPU);
	cx18_write_reg(cx, r & ~val, SW2_INT_ENABLE_CPU);
}

void cx18_setup_page(struct cx18 *cx, u32 addr)
{
	u32 val;
	val = cx18_read_reg(cx, 0xD000F8);
	val = (val & ~0x1f00) | ((addr >> 17) & 0x1f00);
	cx18_write_reg(cx, val, 0xD000F8);
}

Annotation

Implementation Notes