mirror of
https://github.com/raspberrypi/linux.git
synced 2025-12-07 10:29:52 +00:00
3275ce9201
Without the actual power management part any more, there's a lot less to set up for V3D. We just need to clear the RSTN field for the power domain, and expose the reset controller for toggling it again. This is definitely incomplete -- the old ISP and H264 is in the old bridge, but since we have no consumers of it I've just done the minimum to get V3D working. Signed-off-by: Eric Anholt <eric@anholt.net>
104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* PM MFD driver for Broadcom BCM2835
|
|
*
|
|
* This driver binds to the PM block and creates the MFD device for
|
|
* the WDT and power drivers.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mfd/bcm2835-pm.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/types.h>
|
|
#include <linux/watchdog.h>
|
|
|
|
static const struct mfd_cell bcm2835_pm_devs[] = {
|
|
{ .name = "bcm2835-wdt" },
|
|
};
|
|
|
|
static const struct mfd_cell bcm2835_power_devs[] = {
|
|
{ .name = "bcm2835-power" },
|
|
};
|
|
|
|
static int bcm2835_pm_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
struct device *dev = &pdev->dev;
|
|
struct bcm2835_pm *pm;
|
|
int ret;
|
|
|
|
pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
|
|
if (!pm)
|
|
return -ENOMEM;
|
|
platform_set_drvdata(pdev, pm);
|
|
|
|
pm->dev = dev;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
pm->base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(pm->base))
|
|
return PTR_ERR(pm->base);
|
|
|
|
ret = devm_mfd_add_devices(dev, -1,
|
|
bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
|
|
NULL, 0, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Map the ARGON ASB regs if present. */
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
|
|
if (res) {
|
|
pm->arg_asb = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(pm->arg_asb)) {
|
|
dev_err(dev, "Failed to map ARGON ASB: %ld\n",
|
|
PTR_ERR(pm->arg_asb));
|
|
return PTR_ERR(pm->arg_asb);
|
|
}
|
|
}
|
|
|
|
/* We'll use the presence of the AXI ASB regs in the
|
|
* bcm2835-pm binding as the key for whether we can reference
|
|
* the full PM register range and support power domains.
|
|
*/
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
if (res) {
|
|
pm->asb = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(pm->asb))
|
|
return PTR_ERR(pm->asb);
|
|
|
|
ret = devm_mfd_add_devices(dev, -1,
|
|
bcm2835_power_devs,
|
|
ARRAY_SIZE(bcm2835_power_devs),
|
|
NULL, 0, NULL);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id bcm2835_pm_of_match[] = {
|
|
{ .compatible = "brcm,bcm2835-pm-wdt", },
|
|
{ .compatible = "brcm,bcm2835-pm", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
|
|
|
|
static struct platform_driver bcm2835_pm_driver = {
|
|
.probe = bcm2835_pm_probe,
|
|
.driver = {
|
|
.name = "bcm2835-pm",
|
|
.of_match_table = bcm2835_pm_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(bcm2835_pm_driver);
|
|
|
|
MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
|
|
MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
|
|
MODULE_LICENSE("GPL");
|