| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */ |
| |
| #include <linux/kernel.h> |
| #include <linux/interrupt.h> |
| #include <linux/pm_runtime.h> |
| #include "cc_driver.h" |
| #include "cc_buffer_mgr.h" |
| #include "cc_request_mgr.h" |
| #include "cc_sram_mgr.h" |
| #include "cc_hash.h" |
| #include "cc_pm.h" |
| #include "cc_fips.h" |
| |
| #define POWER_DOWN_ENABLE 0x01 |
| #define POWER_DOWN_DISABLE 0x00 |
| |
| const struct dev_pm_ops ccree_pm = { |
| SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL) |
| }; |
| |
| int cc_pm_suspend(struct device *dev) |
| { |
| struct cc_drvdata *drvdata = dev_get_drvdata(dev); |
| |
| dev_dbg(dev, "set HOST_POWER_DOWN_EN\n"); |
| fini_cc_regs(drvdata); |
| cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE); |
| cc_clk_off(drvdata); |
| return 0; |
| } |
| |
| int cc_pm_resume(struct device *dev) |
| { |
| int rc; |
| struct cc_drvdata *drvdata = dev_get_drvdata(dev); |
| |
| dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n"); |
| /* Enables the device source clk */ |
| rc = cc_clk_on(drvdata); |
| if (rc) { |
| dev_err(dev, "failed getting clock back on. We're toast.\n"); |
| return rc; |
| } |
| /* wait for Crytpcell reset completion */ |
| if (!cc_wait_for_reset_completion(drvdata)) { |
| dev_err(dev, "Cryptocell reset not completed"); |
| return -EBUSY; |
| } |
| |
| cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE); |
| rc = init_cc_regs(drvdata, false); |
| if (rc) { |
| dev_err(dev, "init_cc_regs (%x)\n", rc); |
| return rc; |
| } |
| /* check if tee fips error occurred during power down */ |
| cc_tee_handle_fips_error(drvdata); |
| |
| cc_init_hash_sram(drvdata); |
| |
| return 0; |
| } |
| |
| int cc_pm_get(struct device *dev) |
| { |
| int rc = 0; |
| struct cc_drvdata *drvdata = dev_get_drvdata(dev); |
| |
| if (drvdata->pm_on) |
| rc = pm_runtime_get_sync(dev); |
| |
| return (rc == 1 ? 0 : rc); |
| } |
| |
| int cc_pm_put_suspend(struct device *dev) |
| { |
| int rc = 0; |
| struct cc_drvdata *drvdata = dev_get_drvdata(dev); |
| |
| if (drvdata->pm_on) { |
| pm_runtime_mark_last_busy(dev); |
| rc = pm_runtime_put_autosuspend(dev); |
| } |
| |
| return rc; |
| } |
| |
| bool cc_pm_is_dev_suspended(struct device *dev) |
| { |
| /* check device state using runtime api */ |
| return pm_runtime_suspended(dev); |
| } |
| |
| int cc_pm_init(struct cc_drvdata *drvdata) |
| { |
| struct device *dev = drvdata_to_dev(drvdata); |
| |
| /* must be before the enabling to avoid resdundent suspending */ |
| pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT); |
| pm_runtime_use_autosuspend(dev); |
| /* set us as active - note we won't do PM ops until cc_pm_go()! */ |
| return pm_runtime_set_active(dev); |
| } |
| |
| /* enable the PM module*/ |
| void cc_pm_go(struct cc_drvdata *drvdata) |
| { |
| pm_runtime_enable(drvdata_to_dev(drvdata)); |
| drvdata->pm_on = true; |
| } |
| |
| void cc_pm_fini(struct cc_drvdata *drvdata) |
| { |
| pm_runtime_disable(drvdata_to_dev(drvdata)); |
| drvdata->pm_on = false; |
| } |