1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright(c) 2019-2022, Intel Corporation. All rights reserved. 4 * 5 * Intel Management Engine Interface (Intel MEI) Linux driver 6 */ 7 8 #include <linux/module.h> 9 #include <linux/mei_aux.h> 10 #include <linux/device.h> 11 #include <linux/irqreturn.h> 12 #include <linux/jiffies.h> 13 #include <linux/ktime.h> 14 #include <linux/delay.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/kthread.h> 17 18 #include "mei_dev.h" 19 #include "hw-me.h" 20 #include "hw-me-regs.h" 21 22 #include "mei-trace.h" 23 24 #define MEI_GSC_RPM_TIMEOUT 500 25 26 static int mei_gsc_read_hfs(const struct mei_device *dev, int where, u32 *val) 27 { 28 struct mei_me_hw *hw = to_me_hw(dev); 29 30 *val = ioread32(hw->mem_addr + where + 0xC00); 31 32 return 0; 33 } 34 35 static void mei_gsc_set_ext_op_mem(const struct mei_me_hw *hw, struct resource *mem) 36 { 37 u32 low = lower_32_bits(mem->start); 38 u32 hi = upper_32_bits(mem->start); 39 u32 limit = (resource_size(mem) / SZ_4K) | GSC_EXT_OP_MEM_VALID; 40 41 iowrite32(low, hw->mem_addr + H_GSC_EXT_OP_MEM_BASE_ADDR_LO_REG); 42 iowrite32(hi, hw->mem_addr + H_GSC_EXT_OP_MEM_BASE_ADDR_HI_REG); 43 iowrite32(limit, hw->mem_addr + H_GSC_EXT_OP_MEM_LIMIT_REG); 44 } 45 46 static int mei_gsc_probe(struct auxiliary_device *aux_dev, 47 const struct auxiliary_device_id *aux_dev_id) 48 { 49 struct mei_aux_device *adev = auxiliary_dev_to_mei_aux_dev(aux_dev); 50 struct mei_device *dev; 51 struct mei_me_hw *hw; 52 struct device *device; 53 const struct mei_cfg *cfg; 54 int ret; 55 56 cfg = mei_me_get_cfg(aux_dev_id->driver_data); 57 if (!cfg) 58 return -ENODEV; 59 60 device = &aux_dev->dev; 61 62 dev = mei_me_dev_init(device, cfg, adev->slow_firmware); 63 if (!dev) { 64 ret = -ENOMEM; 65 goto err; 66 } 67 68 hw = to_me_hw(dev); 69 hw->mem_addr = devm_ioremap_resource(device, &adev->bar); 70 if (IS_ERR(hw->mem_addr)) { 71 ret = PTR_ERR(hw->mem_addr); 72 goto err; 73 } 74 75 hw->irq = adev->irq; 76 hw->read_fws = mei_gsc_read_hfs; 77 78 dev_set_drvdata(device, dev); 79 80 if (adev->ext_op_mem.start) { 81 mei_gsc_set_ext_op_mem(hw, &adev->ext_op_mem); 82 dev->pxp_mode = MEI_DEV_PXP_INIT; 83 } 84 85 /* use polling */ 86 if (mei_me_hw_use_polling(hw)) { 87 mei_disable_interrupts(dev); 88 mei_clear_interrupts(dev); 89 init_waitqueue_head(&hw->wait_active); 90 hw->is_active = true; /* start in active mode for initialization */ 91 hw->polling_thread = kthread_run(mei_me_polling_thread, dev, 92 "kmegscirqd/%s", dev_name(device)); 93 if (IS_ERR(hw->polling_thread)) { 94 ret = PTR_ERR(hw->polling_thread); 95 dev_err(device, "unable to create kernel thread: %d\n", ret); 96 goto err; 97 } 98 } else { 99 ret = devm_request_threaded_irq(device, hw->irq, 100 mei_me_irq_quick_handler, 101 mei_me_irq_thread_handler, 102 IRQF_ONESHOT, KBUILD_MODNAME, dev); 103 if (ret) { 104 dev_err(device, "irq register failed %d\n", ret); 105 goto err; 106 } 107 } 108 109 pm_runtime_get_noresume(device); 110 pm_runtime_set_active(device); 111 pm_runtime_enable(device); 112 113 /* Continue to char device setup in spite of firmware handshake failure. 114 * In order to provide access to the firmware status registers to the user 115 * space via sysfs. 116 */ 117 if (mei_start(dev)) 118 dev_warn(device, "init hw failure.\n"); 119 120 pm_runtime_set_autosuspend_delay(device, MEI_GSC_RPM_TIMEOUT); 121 pm_runtime_use_autosuspend(device); 122 123 ret = mei_register(dev, device); 124 if (ret) 125 goto register_err; 126 127 pm_runtime_put_noidle(device); 128 return 0; 129 130 register_err: 131 mei_stop(dev); 132 if (!mei_me_hw_use_polling(hw)) 133 devm_free_irq(device, hw->irq, dev); 134 135 err: 136 dev_err(device, "probe failed: %d\n", ret); 137 dev_set_drvdata(device, NULL); 138 return ret; 139 } 140 141 static void mei_gsc_remove(struct auxiliary_device *aux_dev) 142 { 143 struct mei_device *dev; 144 struct mei_me_hw *hw; 145 146 dev = dev_get_drvdata(&aux_dev->dev); 147 if (!dev) 148 return; 149 150 hw = to_me_hw(dev); 151 152 mei_stop(dev); 153 154 hw = to_me_hw(dev); 155 if (mei_me_hw_use_polling(hw)) 156 kthread_stop(hw->polling_thread); 157 158 mei_deregister(dev); 159 160 pm_runtime_disable(&aux_dev->dev); 161 162 mei_disable_interrupts(dev); 163 if (!mei_me_hw_use_polling(hw)) 164 devm_free_irq(&aux_dev->dev, hw->irq, dev); 165 } 166 167 static int __maybe_unused mei_gsc_pm_suspend(struct device *device) 168 { 169 struct mei_device *dev = dev_get_drvdata(device); 170 171 if (!dev) 172 return -ENODEV; 173 174 mei_stop(dev); 175 176 mei_disable_interrupts(dev); 177 178 return 0; 179 } 180 181 static int __maybe_unused mei_gsc_pm_resume(struct device *device) 182 { 183 struct mei_device *dev = dev_get_drvdata(device); 184 struct auxiliary_device *aux_dev; 185 struct mei_aux_device *adev; 186 int err; 187 struct mei_me_hw *hw; 188 189 if (!dev) 190 return -ENODEV; 191 192 hw = to_me_hw(dev); 193 aux_dev = to_auxiliary_dev(device); 194 adev = auxiliary_dev_to_mei_aux_dev(aux_dev); 195 if (adev->ext_op_mem.start) { 196 mei_gsc_set_ext_op_mem(hw, &adev->ext_op_mem); 197 dev->pxp_mode = MEI_DEV_PXP_INIT; 198 } 199 200 err = mei_restart(dev); 201 if (err) 202 return err; 203 204 /* Start timer if stopped in suspend */ 205 schedule_delayed_work(&dev->timer_work, HZ); 206 207 return 0; 208 } 209 210 static int __maybe_unused mei_gsc_pm_runtime_idle(struct device *device) 211 { 212 struct mei_device *dev = dev_get_drvdata(device); 213 214 if (!dev) 215 return -ENODEV; 216 if (mei_write_is_idle(dev)) 217 pm_runtime_autosuspend(device); 218 219 return -EBUSY; 220 } 221 222 static int __maybe_unused mei_gsc_pm_runtime_suspend(struct device *device) 223 { 224 struct mei_device *dev = dev_get_drvdata(device); 225 struct mei_me_hw *hw; 226 int ret; 227 228 if (!dev) 229 return -ENODEV; 230 231 mutex_lock(&dev->device_lock); 232 233 if (mei_write_is_idle(dev)) { 234 hw = to_me_hw(dev); 235 hw->pg_state = MEI_PG_ON; 236 237 if (mei_me_hw_use_polling(hw)) 238 hw->is_active = false; 239 ret = 0; 240 } else { 241 ret = -EAGAIN; 242 } 243 244 mutex_unlock(&dev->device_lock); 245 246 return ret; 247 } 248 249 static int __maybe_unused mei_gsc_pm_runtime_resume(struct device *device) 250 { 251 struct mei_device *dev = dev_get_drvdata(device); 252 struct mei_me_hw *hw; 253 irqreturn_t irq_ret; 254 255 if (!dev) 256 return -ENODEV; 257 258 mutex_lock(&dev->device_lock); 259 260 hw = to_me_hw(dev); 261 hw->pg_state = MEI_PG_OFF; 262 263 if (mei_me_hw_use_polling(hw)) { 264 hw->is_active = true; 265 wake_up(&hw->wait_active); 266 } 267 268 mutex_unlock(&dev->device_lock); 269 270 irq_ret = mei_me_irq_thread_handler(1, dev); 271 if (irq_ret != IRQ_HANDLED) 272 dev_err(dev->dev, "thread handler fail %d\n", irq_ret); 273 274 return 0; 275 } 276 277 static const struct dev_pm_ops mei_gsc_pm_ops = { 278 SET_SYSTEM_SLEEP_PM_OPS(mei_gsc_pm_suspend, 279 mei_gsc_pm_resume) 280 SET_RUNTIME_PM_OPS(mei_gsc_pm_runtime_suspend, 281 mei_gsc_pm_runtime_resume, 282 mei_gsc_pm_runtime_idle) 283 }; 284 285 static const struct auxiliary_device_id mei_gsc_id_table[] = { 286 { 287 .name = "i915.mei-gsc", 288 .driver_data = MEI_ME_GSC_CFG, 289 290 }, 291 { 292 .name = "i915.mei-gscfi", 293 .driver_data = MEI_ME_GSCFI_CFG, 294 }, 295 { 296 /* sentinel */ 297 } 298 }; 299 MODULE_DEVICE_TABLE(auxiliary, mei_gsc_id_table); 300 301 static struct auxiliary_driver mei_gsc_driver = { 302 .probe = mei_gsc_probe, 303 .remove = mei_gsc_remove, 304 .driver = { 305 /* auxiliary_driver_register() sets .name to be the modname */ 306 .pm = &mei_gsc_pm_ops, 307 }, 308 .id_table = mei_gsc_id_table 309 }; 310 module_auxiliary_driver(mei_gsc_driver); 311 312 MODULE_AUTHOR("Intel Corporation"); 313 MODULE_ALIAS("auxiliary:i915.mei-gsc"); 314 MODULE_ALIAS("auxiliary:i915.mei-gscfi"); 315 MODULE_DESCRIPTION("Intel(R) Graphics System Controller"); 316 MODULE_LICENSE("GPL"); 317