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 const struct dev_pm_ops ccree_pm = { 19 SET_RUNTIME_PM_OPS(cc_pm_suspend, cc_pm_resume, NULL) 20 }; 21 22 int cc_pm_suspend(struct device *dev) 23 { 24 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 25 int rc; 26 27 dev_dbg(dev, "set HOST_POWER_DOWN_EN\n"); 28 rc = cc_suspend_req_queue(drvdata); 29 if (rc) { 30 dev_err(dev, "cc_suspend_req_queue (%x)\n", rc); 31 return rc; 32 } 33 fini_cc_regs(drvdata); 34 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE); 35 cc_clk_off(drvdata); 36 return 0; 37 } 38 39 int cc_pm_resume(struct device *dev) 40 { 41 int rc; 42 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 43 44 dev_dbg(dev, "unset HOST_POWER_DOWN_EN\n"); 45 /* Enables the device source clk */ 46 rc = cc_clk_on(drvdata); 47 if (rc) { 48 dev_err(dev, "failed getting clock back on. We're toast.\n"); 49 return rc; 50 } 51 /* wait for Crytpcell reset completion */ 52 if (!cc_wait_for_reset_completion(drvdata)) { 53 dev_err(dev, "Cryptocell reset not completed"); 54 return -EBUSY; 55 } 56 57 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE); 58 rc = init_cc_regs(drvdata, false); 59 if (rc) { 60 dev_err(dev, "init_cc_regs (%x)\n", rc); 61 return rc; 62 } 63 /* check if tee fips error occurred during power down */ 64 cc_tee_handle_fips_error(drvdata); 65 66 rc = cc_resume_req_queue(drvdata); 67 if (rc) { 68 dev_err(dev, "cc_resume_req_queue (%x)\n", rc); 69 return rc; 70 } 71 72 /* must be after the queue resuming as it uses the HW queue*/ 73 cc_init_hash_sram(drvdata); 74 75 return 0; 76 } 77 78 int cc_pm_get(struct device *dev) 79 { 80 int rc = 0; 81 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 82 83 if (cc_req_queue_suspended(drvdata)) 84 rc = pm_runtime_get_sync(dev); 85 else 86 pm_runtime_get_noresume(dev); 87 88 return rc; 89 } 90 91 int cc_pm_put_suspend(struct device *dev) 92 { 93 int rc = 0; 94 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 95 96 if (!cc_req_queue_suspended(drvdata)) { 97 pm_runtime_mark_last_busy(dev); 98 rc = pm_runtime_put_autosuspend(dev); 99 } else { 100 /* Something wrong happens*/ 101 dev_err(dev, "request to suspend already suspended queue"); 102 rc = -EBUSY; 103 } 104 return rc; 105 } 106 107 bool cc_pm_is_dev_suspended(struct device *dev) 108 { 109 /* check device state using runtime api */ 110 return pm_runtime_suspended(dev); 111 } 112 113 int cc_pm_init(struct cc_drvdata *drvdata) 114 { 115 struct device *dev = drvdata_to_dev(drvdata); 116 117 /* must be before the enabling to avoid resdundent suspending */ 118 pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT); 119 pm_runtime_use_autosuspend(dev); 120 /* activate the PM module */ 121 return pm_runtime_set_active(dev); 122 } 123 124 /* enable the PM module*/ 125 void cc_pm_go(struct cc_drvdata *drvdata) 126 { 127 pm_runtime_enable(drvdata_to_dev(drvdata)); 128 } 129 130 void cc_pm_fini(struct cc_drvdata *drvdata) 131 { 132 pm_runtime_disable(drvdata_to_dev(drvdata)); 133 } 134