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		return -EBUSY;
45	}
46
47	cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
48	rc = init_cc_regs(drvdata, false);
49	if (rc) {
50		dev_err(dev, "init_cc_regs (%x)\n", rc);
51		return rc;
52	}
53	/* check if tee fips error occurred during power down */
54	cc_tee_handle_fips_error(drvdata);
55
56	cc_init_hash_sram(drvdata);
57
58	return 0;
59}
60
61const struct dev_pm_ops ccree_pm = {
62	SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
63};
64
65int cc_pm_get(struct device *dev)
66{
67	int rc = pm_runtime_get_sync(dev);
68
69	return (rc == 1 ? 0 : rc);
70}
71
72void cc_pm_put_suspend(struct device *dev)
73{
74	pm_runtime_mark_last_busy(dev);
75	pm_runtime_put_autosuspend(dev);
76}