drivers/gpu/drm/lima/lima_bcast.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/lima/lima_bcast.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/lima/lima_bcast.c
Extension
.c
Size
1531 bytes
Lines
75
Domain
Driver Families
Bucket
drivers/gpu
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 MIT
/* Copyright 2018-2019 Qiang Yu <yuq825@gmail.com> */

#include <linux/io.h>
#include <linux/device.h>

#include "lima_device.h"
#include "lima_bcast.h"
#include "lima_regs.h"

#define bcast_write(reg, data) writel(data, ip->iomem + reg)
#define bcast_read(reg) readl(ip->iomem + reg)

void lima_bcast_enable(struct lima_device *dev, int num_pp)
{
	struct lima_sched_pipe *pipe = dev->pipe + lima_pipe_pp;
	struct lima_ip *ip = dev->ip + lima_ip_bcast;
	int i, mask = bcast_read(LIMA_BCAST_BROADCAST_MASK) & 0xffff0000;

	for (i = 0; i < num_pp; i++) {
		struct lima_ip *pp = pipe->processor[i];

		mask |= 1 << (pp->id - lima_ip_pp0);
	}

	bcast_write(LIMA_BCAST_BROADCAST_MASK, mask);
}

static int lima_bcast_hw_init(struct lima_ip *ip)
{
	bcast_write(LIMA_BCAST_BROADCAST_MASK, ip->data.mask << 16);
	bcast_write(LIMA_BCAST_INTERRUPT_MASK, ip->data.mask);
	return 0;
}

int lima_bcast_resume(struct lima_ip *ip)
{
	return lima_bcast_hw_init(ip);
}

void lima_bcast_suspend(struct lima_ip *ip)
{

}

int lima_bcast_mask_irq(struct lima_ip *ip)
{
	bcast_write(LIMA_BCAST_BROADCAST_MASK, 0);
	bcast_write(LIMA_BCAST_INTERRUPT_MASK, 0);
	return 0;
}

int lima_bcast_reset(struct lima_ip *ip)
{
	return lima_bcast_hw_init(ip);
}

int lima_bcast_init(struct lima_ip *ip)
{
	int i;

	for (i = lima_ip_pp0; i <= lima_ip_pp7; i++) {
		if (ip->dev->ip[i].present)
			ip->data.mask |= 1 << (i - lima_ip_pp0);
	}

	return lima_bcast_hw_init(ip);
}

void lima_bcast_fini(struct lima_ip *ip)
{

}

Annotation

Implementation Notes