forked from Minki/linux
4c3f97276e
Introduce basic low level Arm TrustZone CryptoCell HW support. This first patch doesn't actually register any Crypto API transformations, these will follow up in the next patch. This first revision supports the CC 712 REE component. Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2012-2018 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_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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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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int rc = 0;
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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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rc = pm_runtime_set_active(dev);
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if (rc)
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return rc;
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/* enable the PM module*/
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pm_runtime_enable(dev);
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return rc;
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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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