tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
3
4#include <linux/kernel.h>
5#include <linux/interrupt.h>
6#include <linux/pm_runtime.h>
7#include "cc_driver.h"
8#include "cc_buffer_mgr.h"
9#include "cc_request_mgr.h"
10#include "cc_sram_mgr.h"
11#include "cc_ivgen.h"
12#include "cc_hash.h"
13#include "cc_pm.h"
14#include "cc_fips.h"
15
16#define POWER_DOWN_ENABLE 0x01
17#define POWER_DOWN_DISABLE 0x00
18
19const struct dev_pm_ops ccree_pm = {
20 SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
21};
22
23int cc_pm_suspend(struct device *dev)
24{
25 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
26 int rc;
27
28 dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
29 rc = cc_suspend_req_queue(drvdata);
30 if (rc) {
31 dev_err(dev, "cc_suspend_req_queue (%x)\n", rc);
32 return rc;
33 }
34 fini_cc_regs(drvdata);
35 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
36 cc_clk_off(drvdata);
37 return 0;
38}
39
40int cc_pm_resume(struct device *dev)
41{
42 int rc;
43 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
44
45 dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
46 /* Enables the device source clk */
47 rc = cc_clk_on(drvdata);
48 if (rc) {
49 dev_err(dev, "failed getting clock back on. We're toast.\n");
50 return rc;
51 }
52
53 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
54 rc = init_cc_regs(drvdata, false);
55 if (rc) {
56 dev_err(dev, "init_cc_regs (%x)\n", rc);
57 return rc;
58 }
59 /* check if tee fips error occurred during power down */
60 cc_tee_handle_fips_error(drvdata);
61
62 rc = cc_resume_req_queue(drvdata);
63 if (rc) {
64 dev_err(dev, "cc_resume_req_queue (%x)\n", rc);
65 return rc;
66 }
67
68 /* must be after the queue resuming as it uses the HW queue*/
69 cc_init_hash_sram(drvdata);
70
71 cc_init_iv_sram(drvdata);
72 return 0;
73}
74
75int cc_pm_get(struct device *dev)
76{
77 int rc = 0;
78 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
79
80 if (cc_req_queue_suspended(drvdata))
81 rc = pm_runtime_get_sync(dev);
82 else
83 pm_runtime_get_noresume(dev);
84
85 return rc;
86}
87
88int cc_pm_put_suspend(struct device *dev)
89{
90 int rc = 0;
91 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
92
93 if (!cc_req_queue_suspended(drvdata)) {
94 pm_runtime_mark_last_busy(dev);
95 rc = pm_runtime_put_autosuspend(dev);
96 } else {
97 /* Something wrong happens*/
98 dev_err(dev, "request to suspend already suspended queue");
99 rc = -EBUSY;
100 }
101 return rc;
102}
103
104int cc_pm_init(struct cc_drvdata *drvdata)
105{
106 struct device *dev = drvdata_to_dev(drvdata);
107
108 /* must be before the enabling to avoid resdundent suspending */
109 pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT);
110 pm_runtime_use_autosuspend(dev);
111 /* activate the PM module */
112 return pm_runtime_set_active(dev);
113}
114
115/* enable the PM module*/
116void cc_pm_go(struct cc_drvdata *drvdata)
117{
118 pm_runtime_enable(drvdata_to_dev(drvdata));
119}
120
121void cc_pm_fini(struct cc_drvdata *drvdata)
122{
123 pm_runtime_disable(drvdata_to_dev(drvdata));
124}