Odelu Kukatla | 7382075 | 2017-10-30 13:27:16 +0530 | [diff] [blame] | 1 | /* |
| 2 | *Copyright (c) 2014-2015, 2017, The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | *This program is free software; you can redistribute it and/or modify |
| 5 | *it under the terms of the GNU General Public License version 2 and |
| 6 | *only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | *This program is distributed in the hope that it will be useful, |
| 9 | *but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | *GNU General Public License for more details. |
| 12 | */ |
| 13 | #include <linux/clk.h> |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/devfreq.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/ipc_logging.h> |
| 18 | #include <linux/gfp.h> |
| 19 | #include <linux/list.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/mutex.h> |
| 22 | #include <linux/msm-bus.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | |
| 26 | #include "governor.h" |
| 27 | #include "devfreq_spdm.h" |
| 28 | |
| 29 | static void *spdm_ipc_log_ctxt; |
| 30 | #define DEVFREQ_SPDM_DEFAULT_WINDOW_MS 100 |
| 31 | #define SPDM_IPC_LOG_PAGES 5 |
| 32 | |
| 33 | #define SPDM_IPC_LOG(x...) do { \ |
| 34 | pr_debug(x); \ |
| 35 | if (spdm_ipc_log_ctxt) \ |
| 36 | ipc_log_string(spdm_ipc_log_ctxt, x); \ |
| 37 | } while (0) |
| 38 | |
| 39 | #define COPY_SIZE(x, y) ((x) <= (y) ? (x) : (y)) |
| 40 | |
| 41 | static int change_bw(struct device *dev, unsigned long *freq, u32 flags) |
| 42 | { |
| 43 | struct spdm_data *data = 0; |
| 44 | int i; |
| 45 | int next_idx; |
| 46 | int ret = 0; |
| 47 | struct spdm_args desc = { { 0 } }; |
| 48 | int ext_status = 0; |
| 49 | |
| 50 | if (!dev || !freq) |
| 51 | return -EINVAL; |
| 52 | |
| 53 | data = dev_get_drvdata(dev); |
| 54 | if (!data) |
| 55 | return -EINVAL; |
| 56 | |
| 57 | if (data->devfreq->previous_freq == *freq) |
| 58 | goto update_thresholds; |
| 59 | |
| 60 | next_idx = data->cur_idx + 1; |
| 61 | next_idx = next_idx % 2; |
| 62 | |
| 63 | for (i = 0; i < data->pdata->usecase[next_idx].num_paths; i++) |
| 64 | data->pdata->usecase[next_idx].vectors[i].ab = (*freq) << 6; |
| 65 | |
| 66 | data->cur_idx = next_idx; |
| 67 | ret = msm_bus_scale_client_update_request(data->bus_scale_client_id, |
| 68 | data->cur_idx); |
| 69 | |
| 70 | update_thresholds: |
| 71 | desc.arg[0] = SPDM_CMD_ENABLE; |
| 72 | desc.arg[1] = data->spdm_client; |
| 73 | desc.arg[2] = (clk_get_rate(data->cci_clk)) / 1000; |
| 74 | ext_status = spdm_ext_call(&desc, 3); |
| 75 | if (ext_status) |
| 76 | pr_err("External command %u failed with error %u", |
| 77 | (int)desc.arg[0], ext_status); |
| 78 | return ret; |
| 79 | } |
| 80 | |
| 81 | static int get_cur_bw(struct device *dev, unsigned long *freq) |
| 82 | { |
| 83 | struct spdm_data *data = 0; |
| 84 | |
| 85 | if (!dev || !freq) |
| 86 | return -EINVAL; |
| 87 | |
| 88 | data = dev_get_drvdata(dev); |
| 89 | if (!data) |
| 90 | return -EINVAL; |
| 91 | |
| 92 | *freq = data->pdata->usecase[data->cur_idx].vectors[0].ab >> 6; |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static int get_dev_status(struct device *dev, struct devfreq_dev_status *status) |
| 98 | { |
| 99 | struct spdm_data *data = 0; |
| 100 | int ret; |
| 101 | |
| 102 | if (!dev || !status) |
| 103 | return -EINVAL; |
| 104 | |
| 105 | data = dev_get_drvdata(dev); |
| 106 | if (!data) |
| 107 | return -EINVAL; |
| 108 | |
| 109 | /* |
| 110 | * determine if we want to go up or down based on the notification. |
| 111 | */ |
| 112 | if (data->action == SPDM_UP) |
| 113 | status->busy_time = 255; |
| 114 | else |
| 115 | status->busy_time = 0; |
| 116 | status->total_time = 255; |
| 117 | ret = get_cur_bw(dev, &status->current_frequency); |
| 118 | if (ret) |
| 119 | return ret; |
| 120 | |
| 121 | return 0; |
| 122 | |
| 123 | } |
| 124 | |
| 125 | static int populate_config_data(struct spdm_data *data, |
| 126 | struct platform_device *pdev) |
| 127 | { |
| 128 | int ret = -EINVAL; |
| 129 | struct device_node *node = pdev->dev.of_node; |
| 130 | struct property *prop = 0; |
| 131 | |
| 132 | ret = of_property_read_u32(node, "qcom,max-vote", |
| 133 | &data->config_data.max_vote); |
| 134 | if (ret) |
| 135 | return ret; |
| 136 | |
| 137 | ret = of_property_read_u32(node, "qcom,bw-upstep", |
| 138 | &data->config_data.upstep); |
| 139 | if (ret) |
| 140 | return ret; |
| 141 | |
| 142 | ret = of_property_read_u32(node, "qcom,bw-dwnstep", |
| 143 | &data->config_data.downstep); |
| 144 | if (ret) |
| 145 | return ret; |
| 146 | |
| 147 | ret = of_property_read_u32(node, "qcom,alpha-up", |
| 148 | &data->config_data.aup); |
| 149 | if (ret) |
| 150 | return ret; |
| 151 | |
| 152 | ret = of_property_read_u32(node, "qcom,alpha-down", |
| 153 | &data->config_data.adown); |
| 154 | if (ret) |
| 155 | return ret; |
| 156 | |
| 157 | ret = of_property_read_u32(node, "qcom,bucket-size", |
| 158 | &data->config_data.bucket_size); |
| 159 | if (ret) |
| 160 | return ret; |
| 161 | |
| 162 | ret = of_property_read_u32_array(node, "qcom,pl-freqs", |
| 163 | data->config_data.pl_freqs, |
| 164 | SPDM_PL_COUNT - 1); |
| 165 | if (ret) |
| 166 | return ret; |
| 167 | |
| 168 | ret = of_property_read_u32_array(node, "qcom,reject-rate", |
| 169 | data->config_data.reject_rate, |
| 170 | SPDM_PL_COUNT * 2); |
| 171 | if (ret) |
| 172 | return ret; |
| 173 | |
| 174 | ret = of_property_read_u32_array(node, "qcom,response-time-us", |
| 175 | data->config_data.response_time_us, |
| 176 | SPDM_PL_COUNT * 2); |
| 177 | if (ret) |
| 178 | return ret; |
| 179 | |
| 180 | ret = of_property_read_u32_array(node, "qcom,cci-response-time-us", |
| 181 | data->config_data.cci_response_time_us, |
| 182 | SPDM_PL_COUNT * 2); |
| 183 | if (ret) |
| 184 | return ret; |
| 185 | |
| 186 | ret = of_property_read_u32(node, "qcom,max-cci-freq", |
| 187 | &data->config_data.max_cci_freq); |
| 188 | if (ret) |
| 189 | return ret; |
| 190 | ret = of_property_read_u32(node, "qcom,up-step-multp", |
| 191 | &data->config_data.up_step_multp); |
| 192 | if (ret) |
| 193 | return ret; |
| 194 | |
| 195 | prop = of_find_property(node, "qcom,ports", 0); |
| 196 | if (!prop) |
| 197 | return -EINVAL; |
| 198 | data->config_data.num_ports = prop->length / sizeof(u32); |
| 199 | data->config_data.ports = |
| 200 | devm_kzalloc(&pdev->dev, prop->length, GFP_KERNEL); |
| 201 | if (!data->config_data.ports) |
| 202 | return -ENOMEM; |
| 203 | ret = of_property_read_u32_array(node, "qcom,ports", |
| 204 | data->config_data.ports, |
| 205 | data->config_data.num_ports); |
| 206 | if (ret) { |
| 207 | devm_kfree(&pdev->dev, data->config_data.ports); |
| 208 | data->config_data.ports = NULL; |
| 209 | return ret; |
| 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static int populate_spdm_data(struct spdm_data *data, |
| 216 | struct platform_device *pdev) |
| 217 | { |
| 218 | int ret = -EINVAL; |
| 219 | struct device_node *node = pdev->dev.of_node; |
| 220 | |
| 221 | ret = populate_config_data(data, pdev); |
| 222 | if (ret) |
| 223 | return ret; |
| 224 | |
| 225 | ret = |
| 226 | of_property_read_u32(node, "qcom,spdm-client", &data->spdm_client); |
| 227 | if (ret) |
| 228 | goto no_client; |
| 229 | |
| 230 | ret = of_property_read_u32(node, "qcom,spdm-interval", &data->window); |
| 231 | if (ret) |
| 232 | data->window = DEVFREQ_SPDM_DEFAULT_WINDOW_MS; |
| 233 | |
| 234 | data->pdata = msm_bus_cl_get_pdata(pdev); |
| 235 | if (!data->pdata) { |
| 236 | ret = -EINVAL; |
| 237 | goto no_pdata; |
| 238 | } |
| 239 | |
| 240 | return 0; |
| 241 | |
| 242 | no_client: |
| 243 | no_pdata: |
| 244 | devm_kfree(&pdev->dev, data->config_data.ports); |
| 245 | data->config_data.ports = NULL; |
| 246 | return ret; |
| 247 | } |
| 248 | |
| 249 | #ifdef CONFIG_MSM_HVC |
| 250 | int __spdm_hyp_call(struct spdm_args *args, int num_args) |
| 251 | { |
| 252 | struct hvc_desc desc = { { 0 } }; |
| 253 | int status; |
| 254 | |
| 255 | memcpy(desc.arg, args->arg, |
| 256 | COPY_SIZE(sizeof(desc.arg), sizeof(args->arg))); |
| 257 | SPDM_IPC_LOG("hvc call fn:0x%x, cmd:%llu, num_args:%d\n", |
| 258 | HVC_FN_SIP(SPDM_HYP_FNID), desc.arg[0], num_args); |
| 259 | |
| 260 | status = hvc(HVC_FN_SIP(SPDM_HYP_FNID), &desc); |
| 261 | |
| 262 | memcpy(args->ret, desc.ret, |
| 263 | COPY_SIZE(sizeof(args->ret), sizeof(desc.ret))); |
| 264 | SPDM_IPC_LOG("hvc return fn:0x%x cmd:%llu Ret[0]:%llu Ret[1]:%llu\n", |
| 265 | HVC_FN_SIP(SPDM_HYP_FNID), desc.arg[0], |
| 266 | desc.ret[0], desc.ret[1]); |
| 267 | return status; |
| 268 | } |
| 269 | #endif |
| 270 | |
| 271 | int __spdm_scm_call(struct spdm_args *args, int num_args) |
| 272 | { |
| 273 | int status = 0; |
| 274 | |
| 275 | SPDM_IPC_LOG("%s:svc_id:%d,cmd_id:%d,cmd:%llu,num_args:%d\n", |
| 276 | __func__, SPDM_SCM_SVC_ID, SPDM_SCM_CMD_ID, |
| 277 | args->arg[0], num_args); |
| 278 | |
| 279 | if (!is_scm_armv8()) { |
| 280 | status = scm_call(SPDM_SCM_SVC_ID, SPDM_SCM_CMD_ID, args->arg, |
| 281 | sizeof(args->arg), args->ret, |
| 282 | sizeof(args->ret)); |
| 283 | } else { |
| 284 | struct scm_desc desc = {0}; |
| 285 | /* |
| 286 | * Need to hard code this, this is a requirement from TZ syscall |
| 287 | * interface. |
| 288 | */ |
| 289 | desc.arginfo = SCM_ARGS(6); |
| 290 | memcpy(desc.args, args->arg, |
| 291 | COPY_SIZE(sizeof(desc.args), sizeof(args->arg))); |
| 292 | |
| 293 | status = scm_call2(SCM_SIP_FNID(SPDM_SCM_SVC_ID, |
| 294 | SPDM_SCM_CMD_ID), &desc); |
| 295 | |
| 296 | memcpy(args->ret, desc.ret, |
| 297 | COPY_SIZE(sizeof(args->ret), sizeof(desc.ret))); |
| 298 | } |
| 299 | SPDM_IPC_LOG("%s:svc_id:%d,cmd_id:%d,cmd:%llu,Ret[0]:%llu,Ret[1]:%llu\n" |
| 300 | , __func__, SPDM_SCM_SVC_ID, SPDM_SCM_CMD_ID, args->arg[0], |
| 301 | args->ret[0], args->ret[1]); |
| 302 | return status; |
| 303 | } |
| 304 | |
| 305 | static int probe(struct platform_device *pdev) |
| 306 | { |
| 307 | struct spdm_data *data = 0; |
| 308 | int ret = -EINVAL; |
| 309 | struct spdm_args desc = { { 0 } }; |
| 310 | int ext_status = 0; |
| 311 | |
| 312 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
| 313 | if (!data) |
| 314 | return -ENOMEM; |
| 315 | |
| 316 | data->action = SPDM_DOWN; |
| 317 | |
| 318 | platform_set_drvdata(pdev, data); |
| 319 | |
| 320 | ret = populate_spdm_data(data, pdev); |
| 321 | if (ret) |
| 322 | goto bad_of; |
| 323 | |
| 324 | desc.arg[0] = SPDM_CMD_GET_VERSION; |
| 325 | ext_status = spdm_ext_call(&desc, 1); |
| 326 | if (ext_status) { |
| 327 | pr_err("%s:External command %u failed with error %u\n", |
| 328 | __func__, (int)desc.arg[0], ext_status); |
| 329 | goto bad_of; |
| 330 | } |
| 331 | |
| 332 | if (desc.ret[0] < SPDM_TZ_VERSION) { |
| 333 | pr_err("%s: Version mismatch expected 0x%x got 0x%x", __func__, |
| 334 | SPDM_TZ_VERSION, (int)desc.arg[0]); |
| 335 | goto bad_of; |
| 336 | } |
| 337 | |
| 338 | data->bus_scale_client_id = msm_bus_scale_register_client(data->pdata); |
| 339 | if (!data->bus_scale_client_id) { |
| 340 | ret = -EINVAL; |
| 341 | goto no_bus_scaling; |
| 342 | } |
| 343 | |
| 344 | data->cci_clk = clk_get(&pdev->dev, "cci_clk"); |
| 345 | if (IS_ERR(data->cci_clk)) { |
| 346 | ret = PTR_ERR(data->cci_clk); |
| 347 | goto no_clock; |
| 348 | } |
| 349 | |
| 350 | data->profile = |
| 351 | devm_kzalloc(&pdev->dev, sizeof(*(data->profile)), GFP_KERNEL); |
| 352 | if (!data->profile) { |
| 353 | ret = -ENOMEM; |
| 354 | goto no_profile; |
| 355 | } |
| 356 | data->profile->target = change_bw; |
| 357 | data->profile->get_dev_status = get_dev_status; |
| 358 | data->profile->get_cur_freq = get_cur_bw; |
| 359 | data->profile->polling_ms = data->window; |
| 360 | |
| 361 | data->devfreq = |
| 362 | devfreq_add_device(&pdev->dev, data->profile, "spdm_bw_hyp", data); |
| 363 | if (IS_ERR(data->devfreq)) { |
| 364 | ret = PTR_ERR(data->devfreq); |
| 365 | goto no_spdm_device; |
| 366 | } |
| 367 | |
| 368 | spdm_init_debugfs(&pdev->dev); |
| 369 | spdm_ipc_log_ctxt = ipc_log_context_create(SPDM_IPC_LOG_PAGES, |
| 370 | "devfreq_spdm", 0); |
| 371 | |
| 372 | if (IS_ERR_OR_NULL(spdm_ipc_log_ctxt)) { |
| 373 | pr_err("%s: Failed to create IPC log context\n", __func__); |
| 374 | spdm_ipc_log_ctxt = NULL; |
| 375 | } |
| 376 | |
| 377 | |
| 378 | return 0; |
| 379 | |
| 380 | no_spdm_device: |
| 381 | devm_kfree(&pdev->dev, data->profile); |
| 382 | no_profile: |
| 383 | no_clock: |
| 384 | msm_bus_scale_unregister_client(data->bus_scale_client_id); |
| 385 | no_bus_scaling: |
| 386 | devm_kfree(&pdev->dev, data->config_data.ports); |
| 387 | bad_of: |
| 388 | devm_kfree(&pdev->dev, data); |
| 389 | platform_set_drvdata(pdev, NULL); |
| 390 | return ret; |
| 391 | } |
| 392 | |
| 393 | static int remove(struct platform_device *pdev) |
| 394 | { |
| 395 | struct spdm_data *data = 0; |
| 396 | |
| 397 | data = platform_get_drvdata(pdev); |
| 398 | |
| 399 | spdm_remove_debugfs(data); |
| 400 | |
| 401 | if (data->devfreq) |
| 402 | devfreq_remove_device(data->devfreq); |
| 403 | |
| 404 | if (data->profile) |
| 405 | devm_kfree(&pdev->dev, data->profile); |
| 406 | |
| 407 | if (data->bus_scale_client_id) |
| 408 | msm_bus_scale_unregister_client(data->bus_scale_client_id); |
| 409 | |
| 410 | if (data->config_data.ports) |
| 411 | devm_kfree(&pdev->dev, data->config_data.ports); |
| 412 | |
| 413 | devm_kfree(&pdev->dev, data); |
| 414 | platform_set_drvdata(pdev, NULL); |
| 415 | |
| 416 | if (spdm_ipc_log_ctxt) |
| 417 | ipc_log_context_destroy(spdm_ipc_log_ctxt); |
| 418 | |
| 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | static const struct of_device_id devfreq_spdm_match[] = { |
| 423 | {.compatible = "qcom,devfreq_spdm"}, |
| 424 | {} |
| 425 | }; |
| 426 | |
| 427 | static struct platform_driver devfreq_spdm_drvr = { |
| 428 | .driver = { |
| 429 | .name = "devfreq_spdm", |
| 430 | .owner = THIS_MODULE, |
| 431 | .of_match_table = devfreq_spdm_match, |
| 432 | }, |
| 433 | .probe = probe, |
| 434 | .remove = remove, |
| 435 | }; |
| 436 | |
| 437 | static int __init devfreq_spdm_init(void) |
| 438 | { |
| 439 | return platform_driver_register(&devfreq_spdm_drvr); |
| 440 | } |
| 441 | |
| 442 | module_init(devfreq_spdm_init); |
| 443 | |
| 444 | MODULE_LICENSE("GPL v2"); |