threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
|
|
* CPU idle Marvell Kirkwood SoCs
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*
|
|
* The cpu idle uses wait-for-interrupt and DDR self refresh in order
|
|
* to implement two idle states -
|
|
* #1 wait-for-interrupt
|
|
* #2 wait-for-interrupt and DDR self refresh
|
|
*
|
|
* Maintainer: Jason Cooper <jason@lakedaemon.net>
|
|
* Maintainer: Andrew Lunn <andrew@lunn.ch>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/cpuidle.h>
|
|
#include <linux/io.h>
|
|
#include <linux/export.h>
|
|
#include <asm/cpuidle.h>
|
|
|
|
#define KIRKWOOD_MAX_STATES 2
|
|
|
|
static void __iomem *ddr_operation_base;
|
|
|
|
/* Actual code that puts the SoC in different idle states */
|
|
static int kirkwood_enter_idle(struct cpuidle_device *dev,
|
|
struct cpuidle_driver *drv,
|
|
int index)
|
|
{
|
|
writel(0x7, ddr_operation_base);
|
|
cpu_do_idle();
|
|
|
|
return index;
|
|
}
|
|
|
|
static struct cpuidle_driver kirkwood_idle_driver = {
|
|
.name = "kirkwood_idle",
|
|
.owner = THIS_MODULE,
|
|
.states[0] = ARM_CPUIDLE_WFI_STATE,
|
|
.states[1] = {
|
|
.enter = kirkwood_enter_idle,
|
|
.exit_latency = 10,
|
|
.target_residency = 100000,
|
|
.name = "DDR SR",
|
|
.desc = "WFI and DDR Self Refresh",
|
|
},
|
|
.state_count = KIRKWOOD_MAX_STATES,
|
|
};
|
|
|
|
/* Initialize CPU idle by registering the idle states */
|
|
static int kirkwood_cpuidle_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
ddr_operation_base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(ddr_operation_base))
|
|
return PTR_ERR(ddr_operation_base);
|
|
|
|
return cpuidle_register(&kirkwood_idle_driver, NULL);
|
|
}
|
|
|
|
static int kirkwood_cpuidle_remove(struct platform_device *pdev)
|
|
{
|
|
cpuidle_unregister(&kirkwood_idle_driver);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver kirkwood_cpuidle_driver = {
|
|
.probe = kirkwood_cpuidle_probe,
|
|
.remove = kirkwood_cpuidle_remove,
|
|
.driver = {
|
|
.name = "kirkwood_cpuidle",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(kirkwood_cpuidle_driver);
|
|
|
|
MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
|
|
MODULE_DESCRIPTION("Kirkwood cpu idle driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:kirkwood-cpuidle");
|