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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_hash.h"
12#include "cc_pm.h"
13#include "cc_fips.h"
14
15#define POWER_DOWN_ENABLE 0x01
16#define POWER_DOWN_DISABLE 0x00
17
18static int cc_pm_suspend(struct device *dev)
19{
20 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
21
22 dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
23 fini_cc_regs(drvdata);
24 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
25 clk_disable_unprepare(drvdata->clk);
26 return 0;
27}
28
29static int cc_pm_resume(struct device *dev)
30{
31 int rc;
32 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
33
34 dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
35 /* Enables the device source clk */
36 rc = clk_prepare_enable(drvdata->clk);
37 if (rc) {
38 dev_err(dev, "failed getting clock back on. We're toast.\n");
39 return rc;
40 }
41 /* wait for Cryptocell reset completion */
42 if (!cc_wait_for_reset_completion(drvdata)) {
43 dev_err(dev, "Cryptocell reset not completed");
44 clk_disable_unprepare(drvdata->clk);
45 return -EBUSY;
46 }
47
48 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
49 rc = init_cc_regs(drvdata);
50 if (rc) {
51 dev_err(dev, "init_cc_regs (%x)\n", rc);
52 clk_disable_unprepare(drvdata->clk);
53 return rc;
54 }
55 /* check if tee fips error occurred during power down */
56 cc_tee_handle_fips_error(drvdata);
57
58 cc_init_hash_sram(drvdata);
59
60 return 0;
61}
62
63const struct dev_pm_ops ccree_pm = {
64 SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
65};
66
67int cc_pm_get(struct device *dev)
68{
69 int rc = pm_runtime_get_sync(dev);
70 if (rc < 0) {
71 pm_runtime_put_noidle(dev);
72 return rc;
73 }
74
75 return 0;
76}
77
78void cc_pm_put_suspend(struct device *dev)
79{
80 pm_runtime_mark_last_busy(dev);
81 pm_runtime_put_autosuspend(dev);
82}
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2012-2018 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
15#define POWER_DOWN_ENABLE 0x01
16#define POWER_DOWN_DISABLE 0x00
17
18const struct dev_pm_ops ccree_pm = {
19 SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
20};
21
22int cc_pm_suspend(struct device *dev)
23{
24 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
25 int rc;
26
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);
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_clk_off(drvdata);
36 return 0;
37}
38
39int cc_pm_resume(struct device *dev)
40{
41 int rc;
42 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
43
44 dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
45 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
46
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 rc = init_cc_regs(drvdata, false);
54 if (rc) {
55 dev_err(dev, "init_cc_regs (%x)\n", rc);
56 return rc;
57 }
58
59 rc = cc_resume_req_queue(drvdata);
60 if (rc) {
61 dev_err(dev, "cc_resume_req_queue (%x)\n", rc);
62 return rc;
63 }
64
65 /* must be after the queue resuming as it uses the HW queue*/
66 cc_init_hash_sram(drvdata);
67
68 cc_init_iv_sram(drvdata);
69 return 0;
70}
71
72int cc_pm_get(struct device *dev)
73{
74 int rc = 0;
75 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
76
77 if (cc_req_queue_suspended(drvdata))
78 rc = pm_runtime_get_sync(dev);
79 else
80 pm_runtime_get_noresume(dev);
81
82 return rc;
83}
84
85int cc_pm_put_suspend(struct device *dev)
86{
87 int rc = 0;
88 struct cc_drvdata *drvdata = dev_get_drvdata(dev);
89
90 if (!cc_req_queue_suspended(drvdata)) {
91 pm_runtime_mark_last_busy(dev);
92 rc = pm_runtime_put_autosuspend(dev);
93 } else {
94 /* Something wrong happens*/
95 dev_err(dev, "request to suspend already suspended queue");
96 rc = -EBUSY;
97 }
98 return rc;
99}
100
101int cc_pm_init(struct cc_drvdata *drvdata)
102{
103 int rc = 0;
104 struct device *dev = drvdata_to_dev(drvdata);
105
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);
111 if (rc)
112 return rc;
113 /* enable the PM module*/
114 pm_runtime_enable(dev);
115
116 return rc;
117}
118
119void cc_pm_fini(struct cc_drvdata *drvdata)
120{
121 pm_runtime_disable(drvdata_to_dev(drvdata));
122}