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 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 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE); 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_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 52 cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_DISABLE); 53 54 rc = init_cc_regs(drvdata, false); 55 if (rc) { 56 dev_err(dev, "init_cc_regs (%x)\n", rc); 57 return rc; 58 } 59 60 rc = cc_resume_req_queue(drvdata); 61 if (rc) { 62 dev_err(dev, "cc_resume_req_queue (%x)\n", rc); 63 return rc; 64 } 65 66 /* must be after the queue resuming as it uses the HW queue*/ 67 cc_init_hash_sram(drvdata); 68 69 cc_init_iv_sram(drvdata); 70 return 0; 71 } 72 73 int cc_pm_get(struct device *dev) 74 { 75 int rc = 0; 76 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 77 78 if (cc_req_queue_suspended(drvdata)) 79 rc = pm_runtime_get_sync(dev); 80 else 81 pm_runtime_get_noresume(dev); 82 83 return rc; 84 } 85 86 int cc_pm_put_suspend(struct device *dev) 87 { 88 int rc = 0; 89 struct cc_drvdata *drvdata = dev_get_drvdata(dev); 90 91 if (!cc_req_queue_suspended(drvdata)) { 92 pm_runtime_mark_last_busy(dev); 93 rc = pm_runtime_put_autosuspend(dev); 94 } else { 95 /* Something wrong happens*/ 96 dev_err(dev, "request to suspend already suspended queue"); 97 rc = -EBUSY; 98 } 99 return rc; 100 } 101 102 int cc_pm_init(struct cc_drvdata *drvdata) 103 { 104 struct device *dev = drvdata_to_dev(drvdata); 105 106 /* must be before the enabling to avoid resdundent suspending */ 107 pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT); 108 pm_runtime_use_autosuspend(dev); 109 /* activate the PM module */ 110 return pm_runtime_set_active(dev); 111 } 112 113 /* enable the PM module*/ 114 void cc_pm_go(struct cc_drvdata *drvdata) 115 { 116 pm_runtime_enable(drvdata_to_dev(drvdata)); 117 } 118 119 void cc_pm_fini(struct cc_drvdata *drvdata) 120 { 121 pm_runtime_disable(drvdata_to_dev(drvdata)); 122 } 123