152 строки
3.4 KiB
C
152 строки
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// rcpm.c - Freescale QorIQ RCPM driver
|
|
//
|
|
// Copyright 2019 NXP
|
|
//
|
|
// Author: Ran Wang <ran.wang_1@nxp.com>
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#define RCPM_WAKEUP_CELL_MAX_SIZE 7
|
|
|
|
struct rcpm {
|
|
unsigned int wakeup_cells;
|
|
void __iomem *ippdexpcr_base;
|
|
bool little_endian;
|
|
};
|
|
|
|
/**
|
|
* rcpm_pm_prepare - performs device-level tasks associated with power
|
|
* management, such as programming related to the wakeup source control.
|
|
* @dev: Device to handle.
|
|
*
|
|
*/
|
|
static int rcpm_pm_prepare(struct device *dev)
|
|
{
|
|
int i, ret, idx;
|
|
void __iomem *base;
|
|
struct wakeup_source *ws;
|
|
struct rcpm *rcpm;
|
|
struct device_node *np = dev->of_node;
|
|
u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1];
|
|
u32 setting[RCPM_WAKEUP_CELL_MAX_SIZE] = {0};
|
|
|
|
rcpm = dev_get_drvdata(dev);
|
|
if (!rcpm)
|
|
return -EINVAL;
|
|
|
|
base = rcpm->ippdexpcr_base;
|
|
idx = wakeup_sources_read_lock();
|
|
|
|
/* Begin with first registered wakeup source */
|
|
for_each_wakeup_source(ws) {
|
|
|
|
/* skip object which is not attached to device */
|
|
if (!ws->dev || !ws->dev->parent)
|
|
continue;
|
|
|
|
ret = device_property_read_u32_array(ws->dev->parent,
|
|
"fsl,rcpm-wakeup", value,
|
|
rcpm->wakeup_cells + 1);
|
|
|
|
/* Wakeup source should refer to current rcpm device */
|
|
if (ret || (np->phandle != value[0]))
|
|
continue;
|
|
|
|
/* Property "#fsl,rcpm-wakeup-cells" of rcpm node defines the
|
|
* number of IPPDEXPCR register cells, and "fsl,rcpm-wakeup"
|
|
* of wakeup source IP contains an integer array: <phandle to
|
|
* RCPM node, IPPDEXPCR0 setting, IPPDEXPCR1 setting,
|
|
* IPPDEXPCR2 setting, etc>.
|
|
*
|
|
* So we will go thought them to collect setting data.
|
|
*/
|
|
for (i = 0; i < rcpm->wakeup_cells; i++)
|
|
setting[i] |= value[i + 1];
|
|
}
|
|
|
|
wakeup_sources_read_unlock(idx);
|
|
|
|
/* Program all IPPDEXPCRn once */
|
|
for (i = 0; i < rcpm->wakeup_cells; i++) {
|
|
u32 tmp = setting[i];
|
|
void __iomem *address = base + i * 4;
|
|
|
|
if (!tmp)
|
|
continue;
|
|
|
|
/* We can only OR related bits */
|
|
if (rcpm->little_endian) {
|
|
tmp |= ioread32(address);
|
|
iowrite32(tmp, address);
|
|
} else {
|
|
tmp |= ioread32be(address);
|
|
iowrite32be(tmp, address);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops rcpm_pm_ops = {
|
|
.prepare = rcpm_pm_prepare,
|
|
};
|
|
|
|
static int rcpm_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct resource *r;
|
|
struct rcpm *rcpm;
|
|
int ret;
|
|
|
|
rcpm = devm_kzalloc(dev, sizeof(*rcpm), GFP_KERNEL);
|
|
if (!rcpm)
|
|
return -ENOMEM;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!r)
|
|
return -ENODEV;
|
|
|
|
rcpm->ippdexpcr_base = devm_ioremap_resource(&pdev->dev, r);
|
|
if (IS_ERR(rcpm->ippdexpcr_base)) {
|
|
ret = PTR_ERR(rcpm->ippdexpcr_base);
|
|
return ret;
|
|
}
|
|
|
|
rcpm->little_endian = device_property_read_bool(
|
|
&pdev->dev, "little-endian");
|
|
|
|
ret = device_property_read_u32(&pdev->dev,
|
|
"#fsl,rcpm-wakeup-cells", &rcpm->wakeup_cells);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_set_drvdata(&pdev->dev, rcpm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id rcpm_of_match[] = {
|
|
{ .compatible = "fsl,qoriq-rcpm-2.1+", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, rcpm_of_match);
|
|
|
|
static struct platform_driver rcpm_driver = {
|
|
.driver = {
|
|
.name = "rcpm",
|
|
.of_match_table = rcpm_of_match,
|
|
.pm = &rcpm_pm_ops,
|
|
},
|
|
.probe = rcpm_probe,
|
|
};
|
|
|
|
module_platform_driver(rcpm_driver);
|