1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
4 #include <linux/kernel.h>
5 #include <linux/interrupt.h>
6 #include <linux/pm_runtime.h>
8 #include "cc_buffer_mgr.h"
9 #include "cc_request_mgr.h"
10 #include "cc_sram_mgr.h"
15 #define POWER_DOWN_ENABLE 0x01
16 #define POWER_DOWN_DISABLE 0x00
18 const struct dev_pm_ops ccree_pm = {
19 SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
22 int cc_pm_suspend(struct device *dev)
24 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
27 dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
28 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
29 rc = cc_suspend_req_queue(drvdata);
31 dev_err(dev, "cc_suspend_req_queue (%x)\n", rc);
34 fini_cc_regs(drvdata);
39 int cc_pm_resume(struct device *dev)
42 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
44 dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
45 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
47 rc = cc_clk_on(drvdata);
49 dev_err(dev, "failed getting clock back on. We're toast.\n");
53 rc = init_cc_regs(drvdata, false);
55 dev_err(dev, "init_cc_regs (%x)\n", rc);
59 rc = cc_resume_req_queue(drvdata);
61 dev_err(dev, "cc_resume_req_queue (%x)\n", rc);
65 /* must be after the queue resuming as it uses the HW queue*/
66 cc_init_hash_sram(drvdata);
68 cc_init_iv_sram(drvdata);
72 int cc_pm_get(struct device *dev)
75 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
77 if (cc_req_queue_suspended(drvdata))
78 rc = pm_runtime_get_sync(dev);
80 pm_runtime_get_noresume(dev);
85 int cc_pm_put_suspend(struct device *dev)
88 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
90 if (!cc_req_queue_suspended(drvdata)) {
91 pm_runtime_mark_last_busy(dev);
92 rc = pm_runtime_put_autosuspend(dev);
94 /* Something wrong happens*/
95 dev_err(dev, "request to suspend already suspended queue");
101 int cc_pm_init(struct cc_drvdata *drvdata)
104 struct device *dev = drvdata_to_dev(drvdata);
106 /* must be before the enabling to avoid resdundent suspending */
107 pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT);
108 pm_runtime_use_autosuspend(dev);
109 /* activate the PM module */
110 rc = pm_runtime_set_active(dev);
113 /* enable the PM module*/
114 pm_runtime_enable(dev);
119 void cc_pm_fini(struct cc_drvdata *drvdata)
121 pm_runtime_disable(drvdata_to_dev(drvdata));