mirror of
https://github.com/torvalds/linux
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03963caeb0
This sacrificial copyright header update is offered to the legal department as atonement for any changes made in this driver files in the course of the current year which have not been duly recorded as such. Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/pm_runtime.h>
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#include "cc_driver.h"
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#include "cc_buffer_mgr.h"
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#include "cc_request_mgr.h"
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#include "cc_sram_mgr.h"
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#include "cc_ivgen.h"
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#include "cc_hash.h"
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#include "cc_pm.h"
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#define POWER_DOWN_ENABLE 0x01
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#define POWER_DOWN_DISABLE 0x00
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const struct dev_pm_ops ccree_pm = {
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SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL)
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};
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int cc_pm_suspend(struct device *dev)
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{
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struct cc_drvdata *drvdata = dev_get_drvdata(dev);
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int rc;
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dev_dbg(dev, "set HOST_POWER_DOWN_EN\n");
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cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE);
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rc = cc_suspend_req_queue(drvdata);
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if (rc) {
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dev_err(dev, "cc_suspend_req_queue (%x)\n", rc);
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return rc;
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}
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fini_cc_regs(drvdata);
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cc_clk_off(drvdata);
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return 0;
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}
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int cc_pm_resume(struct device *dev)
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{
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int rc;
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struct cc_drvdata *drvdata = dev_get_drvdata(dev);
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dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n");
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cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE);
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rc = cc_clk_on(drvdata);
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if (rc) {
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dev_err(dev, "failed getting clock back on. We're toast.\n");
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return rc;
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}
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rc = init_cc_regs(drvdata, false);
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if (rc) {
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dev_err(dev, "init_cc_regs (%x)\n", rc);
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return rc;
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}
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rc = cc_resume_req_queue(drvdata);
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if (rc) {
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dev_err(dev, "cc_resume_req_queue (%x)\n", rc);
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return rc;
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}
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/* must be after the queue resuming as it uses the HW queue*/
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cc_init_hash_sram(drvdata);
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cc_init_iv_sram(drvdata);
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return 0;
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}
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int cc_pm_get(struct device *dev)
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{
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int rc = 0;
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struct cc_drvdata *drvdata = dev_get_drvdata(dev);
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if (cc_req_queue_suspended(drvdata))
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rc = pm_runtime_get_sync(dev);
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else
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pm_runtime_get_noresume(dev);
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return rc;
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}
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int cc_pm_put_suspend(struct device *dev)
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{
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int rc = 0;
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struct cc_drvdata *drvdata = dev_get_drvdata(dev);
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if (!cc_req_queue_suspended(drvdata)) {
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pm_runtime_mark_last_busy(dev);
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rc = pm_runtime_put_autosuspend(dev);
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} else {
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/* Something wrong happens*/
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dev_err(dev, "request to suspend already suspended queue");
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rc = -EBUSY;
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}
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return rc;
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}
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int cc_pm_init(struct cc_drvdata *drvdata)
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{
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struct device *dev = drvdata_to_dev(drvdata);
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/* must be before the enabling to avoid resdundent suspending */
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pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT);
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pm_runtime_use_autosuspend(dev);
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/* activate the PM module */
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return pm_runtime_set_active(dev);
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}
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/* enable the PM module*/
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void cc_pm_go(struct cc_drvdata *drvdata)
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{
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pm_runtime_enable(drvdata_to_dev(drvdata));
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}
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void cc_pm_fini(struct cc_drvdata *drvdata)
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{
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pm_runtime_disable(drvdata_to_dev(drvdata));
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}
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