1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * CPU idle Marvell Kirkwood SoCs
 4 *
 
 
 
 
 5 * The cpu idle uses wait-for-interrupt and DDR self refresh in order
 6 * to implement two idle states -
 7 * #1 wait-for-interrupt
 8 * #2 wait-for-interrupt and DDR self refresh
 9 *
10 * Maintainer: Jason Cooper <jason@lakedaemon.net>
11 * Maintainer: Andrew Lunn <andrew@lunn.ch>
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/platform_device.h>
18#include <linux/cpuidle.h>
19#include <linux/io.h>
20#include <linux/export.h>
 
21#include <asm/cpuidle.h>
22
23#define KIRKWOOD_MAX_STATES	2
24
25static void __iomem *ddr_operation_base;
26
27/* Actual code that puts the SoC in different idle states */
28static int kirkwood_enter_idle(struct cpuidle_device *dev,
29			       struct cpuidle_driver *drv,
30			       int index)
31{
32	writel(0x7, ddr_operation_base);
33	cpu_do_idle();
34
35	return index;
36}
37
38static struct cpuidle_driver kirkwood_idle_driver = {
39	.name			= "kirkwood_idle",
40	.owner			= THIS_MODULE,
41	.states[0]		= ARM_CPUIDLE_WFI_STATE,
42	.states[1]		= {
43		.enter			= kirkwood_enter_idle,
44		.exit_latency		= 10,
45		.target_residency	= 100000,
 
46		.name			= "DDR SR",
47		.desc			= "WFI and DDR Self Refresh",
48	},
49	.state_count = KIRKWOOD_MAX_STATES,
50};
51
52/* Initialize CPU idle by registering the idle states */
53static int kirkwood_cpuidle_probe(struct platform_device *pdev)
54{
55	ddr_operation_base = devm_platform_ioremap_resource(pdev, 0);
 
 
 
56	if (IS_ERR(ddr_operation_base))
57		return PTR_ERR(ddr_operation_base);
58
59	return cpuidle_register(&kirkwood_idle_driver, NULL);
60}
61
62static int kirkwood_cpuidle_remove(struct platform_device *pdev)
63{
64	cpuidle_unregister(&kirkwood_idle_driver);
65	return 0;
66}
67
68static struct platform_driver kirkwood_cpuidle_driver = {
69	.probe = kirkwood_cpuidle_probe,
70	.remove = kirkwood_cpuidle_remove,
71	.driver = {
72		   .name = "kirkwood_cpuidle",
 
73		   },
74};
75
76module_platform_driver(kirkwood_cpuidle_driver);
77
78MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
79MODULE_DESCRIPTION("Kirkwood cpu idle driver");
80MODULE_LICENSE("GPL v2");
81MODULE_ALIAS("platform:kirkwood-cpuidle");

 
 1/*
 2 * CPU idle Marvell Kirkwood SoCs
 3 *
 4 * This file is licensed under the terms of the GNU General Public
 5 * License version 2.  This program is licensed "as is" without any
 6 * warranty of any kind, whether express or implied.
 7 *
 8 * The cpu idle uses wait-for-interrupt and DDR self refresh in order
 9 * to implement two idle states -
10 * #1 wait-for-interrupt
11 * #2 wait-for-interrupt and DDR self refresh
12 *
13 * Maintainer: Jason Cooper <jason@lakedaemon.net>
14 * Maintainer: Andrew Lunn <andrew@lunn.ch>
15 */
16
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/platform_device.h>
21#include <linux/cpuidle.h>
22#include <linux/io.h>
23#include <linux/export.h>
24#include <asm/proc-fns.h>
25#include <asm/cpuidle.h>
26
27#define KIRKWOOD_MAX_STATES	2
28
29static void __iomem *ddr_operation_base;
30
31/* Actual code that puts the SoC in different idle states */
32static int kirkwood_enter_idle(struct cpuidle_device *dev,
33			       struct cpuidle_driver *drv,
34			       int index)
35{
36	writel(0x7, ddr_operation_base);
37	cpu_do_idle();
38
39	return index;
40}
41
42static struct cpuidle_driver kirkwood_idle_driver = {
43	.name			= "kirkwood_idle",
44	.owner			= THIS_MODULE,
45	.states[0]		= ARM_CPUIDLE_WFI_STATE,
46	.states[1]		= {
47		.enter			= kirkwood_enter_idle,
48		.exit_latency		= 10,
49		.target_residency	= 100000,
50		.flags			= CPUIDLE_FLAG_TIME_VALID,
51		.name			= "DDR SR",
52		.desc			= "WFI and DDR Self Refresh",
53	},
54	.state_count = KIRKWOOD_MAX_STATES,
55};
56
57/* Initialize CPU idle by registering the idle states */
58static int kirkwood_cpuidle_probe(struct platform_device *pdev)
59{
60	struct resource *res;
61
62	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
63	ddr_operation_base = devm_ioremap_resource(&pdev->dev, res);
64	if (IS_ERR(ddr_operation_base))
65		return PTR_ERR(ddr_operation_base);
66
67	return cpuidle_register(&kirkwood_idle_driver, NULL);
68}
69
70static int kirkwood_cpuidle_remove(struct platform_device *pdev)
71{
72	cpuidle_unregister(&kirkwood_idle_driver);
73	return 0;
74}
75
76static struct platform_driver kirkwood_cpuidle_driver = {
77	.probe = kirkwood_cpuidle_probe,
78	.remove = kirkwood_cpuidle_remove,
79	.driver = {
80		   .name = "kirkwood_cpuidle",
81		   .owner = THIS_MODULE,
82		   },
83};
84
85module_platform_driver(kirkwood_cpuidle_driver);
86
87MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
88MODULE_DESCRIPTION("Kirkwood cpu idle driver");
89MODULE_LICENSE("GPL v2");
90MODULE_ALIAS("platform:kirkwood-cpuidle");