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 18 static 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 29 static 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 61 const struct dev_pm_ops ccree_pm = { 62 SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL) 63 }; 64 65 int cc_pm_get(struct device *dev) 66 { 67 int rc = pm_runtime_get_sync(dev); 68 69 return (rc == 1 ? 0 : rc); 70 } 71 72 void cc_pm_put_suspend(struct device *dev) 73 { 74 pm_runtime_mark_last_busy(dev); 75 pm_runtime_put_autosuspend(dev); 76 } 77