1 // SPDX-License-Identifier: GPL-2.0
3 * Xilinx Zynq MPSoC Power Management
5 * Copyright (C) 2014-2018 Xilinx, Inc.
7 * Davorin Mista <davorin.mista@aggios.com>
8 * Jolly Shah <jollys@xilinx.com>
9 * Rajan Vaja <rajan.vaja@xilinx.com>
12 #include <linux/mailbox_client.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/reboot.h>
16 #include <linux/suspend.h>
18 #include <linux/firmware/xlnx-zynqmp.h>
20 enum pm_suspend_mode {
21 PM_SUSPEND_MODE_FIRST = 0,
22 PM_SUSPEND_MODE_STD = PM_SUSPEND_MODE_FIRST,
23 PM_SUSPEND_MODE_POWER_OFF,
26 #define PM_SUSPEND_MODE_FIRST PM_SUSPEND_MODE_STD
28 static const char *const suspend_modes[] = {
29 [PM_SUSPEND_MODE_STD] = "standard",
30 [PM_SUSPEND_MODE_POWER_OFF] = "power-off",
33 static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD;
34 static const struct zynqmp_eemi_ops *eemi_ops;
37 PM_INIT_SUSPEND_CB = 30,
42 static void zynqmp_pm_get_callback_data(u32 *buf)
44 zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, 0, 0, 0, 0, buf);
47 static irqreturn_t zynqmp_pm_isr(int irq, void *data)
49 u32 payload[CB_PAYLOAD_SIZE];
51 zynqmp_pm_get_callback_data(payload);
53 /* First element is callback API ID, others are callback arguments */
54 if (payload[0] == PM_INIT_SUSPEND_CB) {
56 case SUSPEND_SYSTEM_SHUTDOWN:
57 orderly_poweroff(true);
59 case SUSPEND_POWER_REQUEST:
60 pm_suspend(PM_SUSPEND_MEM);
63 pr_err("%s Unsupported InitSuspendCb reason "
64 "code %d\n", __func__, payload[1]);
71 static ssize_t suspend_mode_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
77 for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
78 if (suspend_modes[md]) {
79 if (md == suspend_mode)
80 s += sprintf(s, "[%s] ", suspend_modes[md]);
82 s += sprintf(s, "%s ", suspend_modes[md]);
85 /* Convert last space to newline */
91 static ssize_t suspend_mode_store(struct device *dev,
92 struct device_attribute *attr,
93 const char *buf, size_t count)
95 int md, ret = -EINVAL;
97 if (!eemi_ops->set_suspend_mode)
100 for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
101 if (suspend_modes[md] &&
102 sysfs_streq(suspend_modes[md], buf)) {
107 if (!ret && md != suspend_mode) {
108 ret = eemi_ops->set_suspend_mode(md);
113 return ret ? ret : count;
116 static DEVICE_ATTR_RW(suspend_mode);
118 static int zynqmp_pm_probe(struct platform_device *pdev)
123 eemi_ops = zynqmp_pm_get_eemi_ops();
124 if (IS_ERR(eemi_ops))
125 return PTR_ERR(eemi_ops);
127 if (!eemi_ops->get_api_version || !eemi_ops->init_finalize)
130 eemi_ops->init_finalize();
131 eemi_ops->get_api_version(&pm_api_version);
133 /* Check PM API version number */
134 if (pm_api_version < ZYNQMP_PM_VERSION)
137 irq = platform_get_irq(pdev, 0);
141 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, zynqmp_pm_isr,
142 IRQF_NO_SUSPEND | IRQF_ONESHOT,
143 dev_name(&pdev->dev), &pdev->dev);
145 dev_err(&pdev->dev, "devm_request_threaded_irq '%d' failed "
146 "with %d\n", irq, ret);
150 ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
152 dev_err(&pdev->dev, "unable to create sysfs interface\n");
159 static int zynqmp_pm_remove(struct platform_device *pdev)
161 sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
166 static const struct of_device_id pm_of_match[] = {
167 { .compatible = "xlnx,zynqmp-power", },
168 { /* end of table */ },
170 MODULE_DEVICE_TABLE(of, pm_of_match);
172 static struct platform_driver zynqmp_pm_platform_driver = {
173 .probe = zynqmp_pm_probe,
174 .remove = zynqmp_pm_remove,
176 .name = "zynqmp_power",
177 .of_match_table = pm_of_match,
180 module_platform_driver(zynqmp_pm_platform_driver);