mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
090d1cf103
All these drivers are configured with Kconfig options that are declared as bool. Hence it is not possible for the code to be built as modular. However the code is currently using the module_platform_driver() macro for driver registration. While this currently works, we really don't want to be including the module.h header in non-modular code, which we'll be forced to do, pending some upcoming code relocation from init.h into module.h. So we fix it now by using the non-modular equivalent. Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Michal Simek <michal.simek@xilinx.com> Cc: linux-pm@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
76 lines
2 KiB
C
76 lines
2 KiB
C
/*
|
|
* Copyright (C) 2012-2013 Xilinx
|
|
*
|
|
* CPU idle support for Xilinx Zynq
|
|
*
|
|
* based on arch/arm/mach-at91/cpuidle.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* The cpu idle uses wait-for-interrupt and RAM self refresh in order
|
|
* to implement two idle states -
|
|
* #1 wait-for-interrupt
|
|
* #2 wait-for-interrupt and RAM self refresh
|
|
*
|
|
* Maintainer: Michal Simek <michal.simek@xilinx.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/cpuidle.h>
|
|
#include <linux/platform_device.h>
|
|
#include <asm/cpuidle.h>
|
|
|
|
#define ZYNQ_MAX_STATES 2
|
|
|
|
/* Actual code that puts the SoC in different idle states */
|
|
static int zynq_enter_idle(struct cpuidle_device *dev,
|
|
struct cpuidle_driver *drv, int index)
|
|
{
|
|
/* Add code for DDR self refresh start */
|
|
cpu_do_idle();
|
|
|
|
return index;
|
|
}
|
|
|
|
static struct cpuidle_driver zynq_idle_driver = {
|
|
.name = "zynq_idle",
|
|
.owner = THIS_MODULE,
|
|
.states = {
|
|
ARM_CPUIDLE_WFI_STATE,
|
|
{
|
|
.enter = zynq_enter_idle,
|
|
.exit_latency = 10,
|
|
.target_residency = 10000,
|
|
.name = "RAM_SR",
|
|
.desc = "WFI and RAM Self Refresh",
|
|
},
|
|
},
|
|
.safe_state_index = 0,
|
|
.state_count = ZYNQ_MAX_STATES,
|
|
};
|
|
|
|
/* Initialize CPU idle by registering the idle states */
|
|
static int zynq_cpuidle_probe(struct platform_device *pdev)
|
|
{
|
|
pr_info("Xilinx Zynq CpuIdle Driver started\n");
|
|
|
|
return cpuidle_register(&zynq_idle_driver, NULL);
|
|
}
|
|
|
|
static struct platform_driver zynq_cpuidle_driver = {
|
|
.driver = {
|
|
.name = "cpuidle-zynq",
|
|
},
|
|
.probe = zynq_cpuidle_probe,
|
|
};
|
|
builtin_platform_driver(zynq_cpuidle_driver);
|