mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
3.6 KiB
127 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* Copyright (C) 2020 Maxime Ripard <[email protected]> */ |
|
|
|
#include <linux/device.h> |
|
#include <linux/dma-map-ops.h> |
|
#include <linux/init.h> |
|
#include <linux/notifier.h> |
|
#include <linux/of.h> |
|
#include <linux/platform_device.h> |
|
|
|
static const char * const sunxi_mbus_devices[] = { |
|
/* |
|
* The display engine virtual devices are not strictly speaking |
|
* connected to the MBUS, but since DRM will perform all the |
|
* memory allocations and DMA operations through that device, we |
|
* need to have the quirk on those devices too. |
|
*/ |
|
"allwinner,sun4i-a10-display-engine", |
|
"allwinner,sun5i-a10s-display-engine", |
|
"allwinner,sun5i-a13-display-engine", |
|
"allwinner,sun6i-a31-display-engine", |
|
"allwinner,sun6i-a31s-display-engine", |
|
"allwinner,sun7i-a20-display-engine", |
|
"allwinner,sun8i-a23-display-engine", |
|
"allwinner,sun8i-a33-display-engine", |
|
"allwinner,sun9i-a80-display-engine", |
|
|
|
/* |
|
* And now we have the regular devices connected to the MBUS |
|
* (that we know of). |
|
*/ |
|
"allwinner,sun4i-a10-csi1", |
|
"allwinner,sun4i-a10-display-backend", |
|
"allwinner,sun4i-a10-display-frontend", |
|
"allwinner,sun4i-a10-video-engine", |
|
"allwinner,sun5i-a13-display-backend", |
|
"allwinner,sun5i-a13-video-engine", |
|
"allwinner,sun6i-a31-csi", |
|
"allwinner,sun6i-a31-display-backend", |
|
"allwinner,sun7i-a20-csi0", |
|
"allwinner,sun7i-a20-display-backend", |
|
"allwinner,sun7i-a20-display-frontend", |
|
"allwinner,sun7i-a20-video-engine", |
|
"allwinner,sun8i-a23-display-backend", |
|
"allwinner,sun8i-a23-display-frontend", |
|
"allwinner,sun8i-a33-display-backend", |
|
"allwinner,sun8i-a33-display-frontend", |
|
"allwinner,sun8i-a33-video-engine", |
|
"allwinner,sun8i-a83t-csi", |
|
"allwinner,sun8i-h3-csi", |
|
"allwinner,sun8i-h3-video-engine", |
|
"allwinner,sun8i-v3s-csi", |
|
"allwinner,sun9i-a80-display-backend", |
|
"allwinner,sun50i-a64-csi", |
|
"allwinner,sun50i-a64-video-engine", |
|
"allwinner,sun50i-h5-video-engine", |
|
NULL, |
|
}; |
|
|
|
static int sunxi_mbus_notifier(struct notifier_block *nb, |
|
unsigned long event, void *__dev) |
|
{ |
|
struct device *dev = __dev; |
|
int ret; |
|
|
|
if (event != BUS_NOTIFY_ADD_DEVICE) |
|
return NOTIFY_DONE; |
|
|
|
/* |
|
* Only the devices that need a large memory bandwidth do DMA |
|
* directly over the memory bus (called MBUS), instead of going |
|
* through the regular system bus. |
|
*/ |
|
if (!of_device_compatible_match(dev->of_node, sunxi_mbus_devices)) |
|
return NOTIFY_DONE; |
|
|
|
/* |
|
* Devices with an interconnects property have the MBUS |
|
* relationship described in their DT and dealt with by |
|
* of_dma_configure, so we can just skip them. |
|
* |
|
* Older DTs or SoCs who are not clearly understood need to set |
|
* that DMA offset though. |
|
*/ |
|
if (of_find_property(dev->of_node, "interconnects", NULL)) |
|
return NOTIFY_DONE; |
|
|
|
ret = dma_direct_set_offset(dev, PHYS_OFFSET, 0, SZ_4G); |
|
if (ret) |
|
dev_err(dev, "Couldn't setup our DMA offset: %d\n", ret); |
|
|
|
return NOTIFY_DONE; |
|
} |
|
|
|
static struct notifier_block sunxi_mbus_nb = { |
|
.notifier_call = sunxi_mbus_notifier, |
|
}; |
|
|
|
static const char * const sunxi_mbus_platforms[] __initconst = { |
|
"allwinner,sun4i-a10", |
|
"allwinner,sun5i-a10s", |
|
"allwinner,sun5i-a13", |
|
"allwinner,sun6i-a31", |
|
"allwinner,sun7i-a20", |
|
"allwinner,sun8i-a23", |
|
"allwinner,sun8i-a33", |
|
"allwinner,sun8i-a83t", |
|
"allwinner,sun8i-h3", |
|
"allwinner,sun8i-r40", |
|
"allwinner,sun8i-v3", |
|
"allwinner,sun8i-v3s", |
|
"allwinner,sun9i-a80", |
|
"allwinner,sun50i-a64", |
|
"allwinner,sun50i-h5", |
|
"nextthing,gr8", |
|
NULL, |
|
}; |
|
|
|
static int __init sunxi_mbus_init(void) |
|
{ |
|
if (!of_device_compatible_match(of_root, sunxi_mbus_platforms)) |
|
return 0; |
|
|
|
bus_register_notifier(&platform_bus_type, &sunxi_mbus_nb); |
|
return 0; |
|
} |
|
arch_initcall(sunxi_mbus_init);
|
|
|