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_ivgen.h" 12 #include "cc_hash.h" 13 #include "cc_pm.h" 14 #include "cc_fips.h" 15 16 #define POWER_DOWN_ENABLE 0x01 17 #define POWER_DOWN_DISABLE 0x00 18 19 const struct dev_pm_ops ccree_pm = { 20 SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL) 21 }; 22 23 int cc_pm_suspend(struct device *dev) 24 { 25 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 26 int rc; 27 28 dev_dbg(dev, "set HOST_POWER_DOWN_EN\n"); 29 rc = cc_suspend_req_queue(drvdata); 30 if (rc) { 31 dev_err(dev, "cc_suspend_req_queue (%x)\n", rc); 32 return rc; 33 } 34 fini_cc_regs(drvdata); 35 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE); 36 cc_clk_off(drvdata); 37 return 0; 38 } 39 40 int cc_pm_resume(struct device *dev) 41 { 42 int rc; 43 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 44 45 dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n"); 46 /* Enables the device source clk */ 47 rc = cc_clk_on(drvdata); 48 if (rc) { 49 dev_err(dev, "failed getting clock back on. We're toast.\n"); 50 return rc; 51 } 52 /* wait for Crytpcell reset completion */ 53 if (!cc_wait_for_reset_completion(drvdata)) { 54 dev_err(dev, "Cryptocell reset not completed"); 55 return -EBUSY; 56 } 57 58 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE); 59 rc = init_cc_regs(drvdata, false); 60 if (rc) { 61 dev_err(dev, "init_cc_regs (%x)\n", rc); 62 return rc; 63 } 64 /* check if tee fips error occurred during power down */ 65 cc_tee_handle_fips_error(drvdata); 66 67 rc = cc_resume_req_queue(drvdata); 68 if (rc) { 69 dev_err(dev, "cc_resume_req_queue (%x)\n", rc); 70 return rc; 71 } 72 73 /* must be after the queue resuming as it uses the HW queue*/ 74 cc_init_hash_sram(drvdata); 75 76 cc_init_iv_sram(drvdata); 77 return 0; 78 } 79 80 int cc_pm_get(struct device *dev) 81 { 82 int rc = 0; 83 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 84 85 if (cc_req_queue_suspended(drvdata)) 86 rc = pm_runtime_get_sync(dev); 87 else 88 pm_runtime_get_noresume(dev); 89 90 return rc; 91 } 92 93 int cc_pm_put_suspend(struct device *dev) 94 { 95 int rc = 0; 96 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 97 98 if (!cc_req_queue_suspended(drvdata)) { 99 pm_runtime_mark_last_busy(dev); 100 rc = pm_runtime_put_autosuspend(dev); 101 } else { 102 /* Something wrong happens*/ 103 dev_err(dev, "request to suspend already suspended queue"); 104 rc = -EBUSY; 105 } 106 return rc; 107 } 108 109 int cc_pm_init(struct cc_drvdata *drvdata) 110 { 111 struct device *dev = drvdata_to_dev(drvdata); 112 113 /* must be before the enabling to avoid resdundent suspending */ 114 pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT); 115 pm_runtime_use_autosuspend(dev); 116 /* activate the PM module */ 117 return pm_runtime_set_active(dev); 118 } 119 120 /* enable the PM module*/ 121 void cc_pm_go(struct cc_drvdata *drvdata) 122 { 123 pm_runtime_enable(drvdata_to_dev(drvdata)); 124 } 125 126 void cc_pm_fini(struct cc_drvdata *drvdata) 127 { 128 pm_runtime_disable(drvdata_to_dev(drvdata)); 129 } 130