mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Cai Huoqing](/assets/img/avatar_default.png)
Use the devm_platform_ioremap_resource() helper instead of calling platform_get_resource() and devm_ioremap_resource() separately Signed-off-by: Cai Huoqing <caihuoqing@baidu.com> Signed-off-by: Li Yang <leoyang.li@nxp.com>
199 lines
4.5 KiB
C
199 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// rcpm.c - Freescale QorIQ RCPM driver
|
|
//
|
|
// Copyright 2019-2020 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>
|
|
#include <linux/acpi.h>
|
|
|
|
#define RCPM_WAKEUP_CELL_MAX_SIZE 7
|
|
|
|
struct rcpm {
|
|
unsigned int wakeup_cells;
|
|
void __iomem *ippdexpcr_base;
|
|
bool little_endian;
|
|
};
|
|
|
|
#define SCFG_SPARECR8 0x051c
|
|
|
|
static void copy_ippdexpcr1_setting(u32 val)
|
|
{
|
|
struct device_node *np;
|
|
void __iomem *regs;
|
|
u32 reg_val;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "fsl,ls1021a-scfg");
|
|
if (!np)
|
|
return;
|
|
|
|
regs = of_iomap(np, 0);
|
|
if (!regs)
|
|
return;
|
|
|
|
reg_val = ioread32be(regs + SCFG_SPARECR8);
|
|
iowrite32be(val | reg_val, regs + SCFG_SPARECR8);
|
|
|
|
iounmap(regs);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
if (ret)
|
|
continue;
|
|
|
|
/*
|
|
* For DT mode, would handle devices with "fsl,rcpm-wakeup"
|
|
* pointing to the current RCPM node.
|
|
*
|
|
* For ACPI mode, currently we assume there is only one
|
|
* RCPM controller existing.
|
|
*/
|
|
if (is_of_node(dev->fwnode))
|
|
if (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);
|
|
}
|
|
/*
|
|
* Workaround of errata A-008646 on SoC LS1021A:
|
|
* There is a bug of register ippdexpcr1.
|
|
* Reading configuration register RCPM_IPPDEXPCR1
|
|
* always return zero. So save ippdexpcr1's value
|
|
* to register SCFG_SPARECR8.And the value of
|
|
* ippdexpcr1 will be read from SCFG_SPARECR8.
|
|
*/
|
|
if (dev_of_node(dev) && (i == 1))
|
|
if (of_device_is_compatible(np, "fsl,ls1021a-rcpm"))
|
|
copy_ippdexpcr1_setting(tmp);
|
|
}
|
|
|
|
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 rcpm *rcpm;
|
|
int ret;
|
|
|
|
rcpm = devm_kzalloc(dev, sizeof(*rcpm), GFP_KERNEL);
|
|
if (!rcpm)
|
|
return -ENOMEM;
|
|
|
|
rcpm->ippdexpcr_base = devm_platform_ioremap_resource(pdev, 0);
|
|
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);
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static const struct acpi_device_id rcpm_acpi_ids[] = {
|
|
{"NXP0015",},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, rcpm_acpi_ids);
|
|
#endif
|
|
|
|
static struct platform_driver rcpm_driver = {
|
|
.driver = {
|
|
.name = "rcpm",
|
|
.of_match_table = rcpm_of_match,
|
|
.acpi_match_table = ACPI_PTR(rcpm_acpi_ids),
|
|
.pm = &rcpm_pm_ops,
|
|
},
|
|
.probe = rcpm_probe,
|
|
};
|
|
|
|
module_platform_driver(rcpm_driver);
|