jilai wang | 9626b69 | 2015-04-10 16:15:59 -0400 | [diff] [blame] | 1 | /* Copyright (c) 2010,2015, The Linux Foundation. All rights reserved. |
Lina Iyer | 2ce76a6 | 2015-03-02 16:30:29 -0700 | [diff] [blame] | 2 | * Copyright (C) 2015 Linaro Ltd. |
Stephen Boyd | 2a1eb58 | 2010-08-27 10:01:23 -0700 | [diff] [blame] | 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 | * |
Stephen Boyd | 2a1eb58 | 2010-08-27 10:01:23 -0700 | [diff] [blame] | 13 | */ |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/module.h> |
Kumar Gala | b6a1dfb | 2015-03-11 16:28:10 -0500 | [diff] [blame] | 16 | #include <linux/cpumask.h> |
| 17 | #include <linux/export.h> |
Bjorn Andersson | f01e90f | 2015-09-23 12:56:12 -0700 | [diff] [blame^] | 18 | #include <linux/dma-mapping.h> |
Kumar Gala | b6a1dfb | 2015-03-11 16:28:10 -0500 | [diff] [blame] | 19 | #include <linux/types.h> |
Kumar Gala | 916f743 | 2015-02-26 15:49:09 -0600 | [diff] [blame] | 20 | #include <linux/qcom_scm.h> |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 21 | #include <linux/of.h> |
| 22 | #include <linux/of_platform.h> |
| 23 | #include <linux/clk.h> |
Stephen Boyd | 2a1eb58 | 2010-08-27 10:01:23 -0700 | [diff] [blame] | 24 | |
Kumar Gala | b6a1dfb | 2015-03-11 16:28:10 -0500 | [diff] [blame] | 25 | #include "qcom_scm.h" |
Lina Iyer | a353e4a | 2015-03-02 16:30:28 -0700 | [diff] [blame] | 26 | |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 27 | struct qcom_scm { |
| 28 | struct device *dev; |
| 29 | struct clk *core_clk; |
| 30 | struct clk *iface_clk; |
| 31 | struct clk *bus_clk; |
| 32 | }; |
| 33 | |
| 34 | static struct qcom_scm *__scm; |
| 35 | |
| 36 | static int qcom_scm_clk_enable(void) |
| 37 | { |
| 38 | int ret; |
| 39 | |
| 40 | ret = clk_prepare_enable(__scm->core_clk); |
| 41 | if (ret) |
| 42 | goto bail; |
| 43 | |
| 44 | ret = clk_prepare_enable(__scm->iface_clk); |
| 45 | if (ret) |
| 46 | goto disable_core; |
| 47 | |
| 48 | ret = clk_prepare_enable(__scm->bus_clk); |
| 49 | if (ret) |
| 50 | goto disable_iface; |
| 51 | |
| 52 | return 0; |
| 53 | |
| 54 | disable_iface: |
| 55 | clk_disable_unprepare(__scm->iface_clk); |
| 56 | disable_core: |
| 57 | clk_disable_unprepare(__scm->core_clk); |
| 58 | bail: |
| 59 | return ret; |
| 60 | } |
| 61 | |
| 62 | static void qcom_scm_clk_disable(void) |
| 63 | { |
| 64 | clk_disable_unprepare(__scm->core_clk); |
| 65 | clk_disable_unprepare(__scm->iface_clk); |
| 66 | clk_disable_unprepare(__scm->bus_clk); |
| 67 | } |
| 68 | |
Lina Iyer | a353e4a | 2015-03-02 16:30:28 -0700 | [diff] [blame] | 69 | /** |
| 70 | * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus |
| 71 | * @entry: Entry point function for the cpus |
| 72 | * @cpus: The cpumask of cpus that will use the entry point |
| 73 | * |
| 74 | * Set the cold boot address of the cpus. Any cpu outside the supported |
| 75 | * range would be removed from the cpu present mask. |
| 76 | */ |
| 77 | int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus) |
| 78 | { |
Kumar Gala | b6a1dfb | 2015-03-11 16:28:10 -0500 | [diff] [blame] | 79 | return __qcom_scm_set_cold_boot_addr(entry, cpus); |
Lina Iyer | a353e4a | 2015-03-02 16:30:28 -0700 | [diff] [blame] | 80 | } |
| 81 | EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr); |
Lina Iyer | 2ce76a6 | 2015-03-02 16:30:29 -0700 | [diff] [blame] | 82 | |
| 83 | /** |
| 84 | * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus |
| 85 | * @entry: Entry point function for the cpus |
| 86 | * @cpus: The cpumask of cpus that will use the entry point |
| 87 | * |
| 88 | * Set the Linux entry point for the SCM to transfer control to when coming |
| 89 | * out of a power down. CPU power down may be executed on cpuidle or hotplug. |
| 90 | */ |
| 91 | int qcom_scm_set_warm_boot_addr(void *entry, const cpumask_t *cpus) |
| 92 | { |
Andy Gross | 16e5946 | 2016-06-03 18:25:25 -0500 | [diff] [blame] | 93 | return __qcom_scm_set_warm_boot_addr(__scm->dev, entry, cpus); |
Lina Iyer | 2ce76a6 | 2015-03-02 16:30:29 -0700 | [diff] [blame] | 94 | } |
| 95 | EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr); |
Lina Iyer | 767b023 | 2015-03-02 16:30:30 -0700 | [diff] [blame] | 96 | |
Lina Iyer | 767b023 | 2015-03-02 16:30:30 -0700 | [diff] [blame] | 97 | /** |
| 98 | * qcom_scm_cpu_power_down() - Power down the cpu |
| 99 | * @flags - Flags to flush cache |
| 100 | * |
| 101 | * This is an end point to power down cpu. If there was a pending interrupt, |
| 102 | * the control would return from this function, otherwise, the cpu jumps to the |
| 103 | * warm boot entry point set for this cpu upon reset. |
| 104 | */ |
| 105 | void qcom_scm_cpu_power_down(u32 flags) |
| 106 | { |
Kumar Gala | b6a1dfb | 2015-03-11 16:28:10 -0500 | [diff] [blame] | 107 | __qcom_scm_cpu_power_down(flags); |
Lina Iyer | 767b023 | 2015-03-02 16:30:30 -0700 | [diff] [blame] | 108 | } |
| 109 | EXPORT_SYMBOL(qcom_scm_cpu_power_down); |
jilai wang | 9626b69 | 2015-04-10 16:15:59 -0400 | [diff] [blame] | 110 | |
| 111 | /** |
| 112 | * qcom_scm_hdcp_available() - Check if secure environment supports HDCP. |
| 113 | * |
| 114 | * Return true if HDCP is supported, false if not. |
| 115 | */ |
| 116 | bool qcom_scm_hdcp_available(void) |
| 117 | { |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 118 | int ret = qcom_scm_clk_enable(); |
| 119 | |
| 120 | if (ret) |
| 121 | return ret; |
jilai wang | 9626b69 | 2015-04-10 16:15:59 -0400 | [diff] [blame] | 122 | |
Andy Gross | 16e5946 | 2016-06-03 18:25:25 -0500 | [diff] [blame] | 123 | ret = __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_HDCP, |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 124 | QCOM_SCM_CMD_HDCP); |
jilai wang | 9626b69 | 2015-04-10 16:15:59 -0400 | [diff] [blame] | 125 | |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 126 | qcom_scm_clk_disable(); |
| 127 | |
| 128 | return ret > 0 ? true : false; |
jilai wang | 9626b69 | 2015-04-10 16:15:59 -0400 | [diff] [blame] | 129 | } |
| 130 | EXPORT_SYMBOL(qcom_scm_hdcp_available); |
| 131 | |
| 132 | /** |
| 133 | * qcom_scm_hdcp_req() - Send HDCP request. |
| 134 | * @req: HDCP request array |
| 135 | * @req_cnt: HDCP request array count |
| 136 | * @resp: response buffer passed to SCM |
| 137 | * |
| 138 | * Write HDCP register(s) through SCM. |
| 139 | */ |
| 140 | int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp) |
| 141 | { |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 142 | int ret = qcom_scm_clk_enable(); |
| 143 | |
| 144 | if (ret) |
| 145 | return ret; |
| 146 | |
Andy Gross | 16e5946 | 2016-06-03 18:25:25 -0500 | [diff] [blame] | 147 | ret = __qcom_scm_hdcp_req(__scm->dev, req, req_cnt, resp); |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 148 | qcom_scm_clk_disable(); |
| 149 | return ret; |
jilai wang | 9626b69 | 2015-04-10 16:15:59 -0400 | [diff] [blame] | 150 | } |
| 151 | EXPORT_SYMBOL(qcom_scm_hdcp_req); |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 152 | |
Bjorn Andersson | f01e90f | 2015-09-23 12:56:12 -0700 | [diff] [blame^] | 153 | /** |
| 154 | * qcom_scm_pas_supported() - Check if the peripheral authentication service is |
| 155 | * available for the given peripherial |
| 156 | * @peripheral: peripheral id |
| 157 | * |
| 158 | * Returns true if PAS is supported for this peripheral, otherwise false. |
| 159 | */ |
| 160 | bool qcom_scm_pas_supported(u32 peripheral) |
| 161 | { |
| 162 | int ret; |
| 163 | |
| 164 | ret = __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_PIL, |
| 165 | QCOM_SCM_PAS_IS_SUPPORTED_CMD); |
| 166 | if (ret <= 0) |
| 167 | return false; |
| 168 | |
| 169 | return __qcom_scm_pas_supported(__scm->dev, peripheral); |
| 170 | } |
| 171 | EXPORT_SYMBOL(qcom_scm_pas_supported); |
| 172 | |
| 173 | /** |
| 174 | * qcom_scm_pas_init_image() - Initialize peripheral authentication service |
| 175 | * state machine for a given peripheral, using the |
| 176 | * metadata |
| 177 | * @peripheral: peripheral id |
| 178 | * @metadata: pointer to memory containing ELF header, program header table |
| 179 | * and optional blob of data used for authenticating the metadata |
| 180 | * and the rest of the firmware |
| 181 | * @size: size of the metadata |
| 182 | * |
| 183 | * Returns 0 on success. |
| 184 | */ |
| 185 | int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size) |
| 186 | { |
| 187 | dma_addr_t mdata_phys; |
| 188 | void *mdata_buf; |
| 189 | int ret; |
| 190 | |
| 191 | /* |
| 192 | * During the scm call memory protection will be enabled for the meta |
| 193 | * data blob, so make sure it's physically contiguous, 4K aligned and |
| 194 | * non-cachable to avoid XPU violations. |
| 195 | */ |
| 196 | mdata_buf = dma_alloc_coherent(__scm->dev, size, &mdata_phys, |
| 197 | GFP_KERNEL); |
| 198 | if (!mdata_buf) { |
| 199 | dev_err(__scm->dev, "Allocation of metadata buffer failed.\n"); |
| 200 | return -ENOMEM; |
| 201 | } |
| 202 | memcpy(mdata_buf, metadata, size); |
| 203 | |
| 204 | ret = qcom_scm_clk_enable(); |
| 205 | if (ret) |
| 206 | goto free_metadata; |
| 207 | |
| 208 | ret = __qcom_scm_pas_init_image(__scm->dev, peripheral, mdata_phys); |
| 209 | |
| 210 | qcom_scm_clk_disable(); |
| 211 | |
| 212 | free_metadata: |
| 213 | dma_free_coherent(__scm->dev, size, mdata_buf, mdata_phys); |
| 214 | |
| 215 | return ret; |
| 216 | } |
| 217 | EXPORT_SYMBOL(qcom_scm_pas_init_image); |
| 218 | |
| 219 | /** |
| 220 | * qcom_scm_pas_mem_setup() - Prepare the memory related to a given peripheral |
| 221 | * for firmware loading |
| 222 | * @peripheral: peripheral id |
| 223 | * @addr: start address of memory area to prepare |
| 224 | * @size: size of the memory area to prepare |
| 225 | * |
| 226 | * Returns 0 on success. |
| 227 | */ |
| 228 | int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size) |
| 229 | { |
| 230 | int ret; |
| 231 | |
| 232 | ret = qcom_scm_clk_enable(); |
| 233 | if (ret) |
| 234 | return ret; |
| 235 | |
| 236 | ret = __qcom_scm_pas_mem_setup(__scm->dev, peripheral, addr, size); |
| 237 | qcom_scm_clk_disable(); |
| 238 | |
| 239 | return ret; |
| 240 | } |
| 241 | EXPORT_SYMBOL(qcom_scm_pas_mem_setup); |
| 242 | |
| 243 | /** |
| 244 | * qcom_scm_pas_auth_and_reset() - Authenticate the given peripheral firmware |
| 245 | * and reset the remote processor |
| 246 | * @peripheral: peripheral id |
| 247 | * |
| 248 | * Return 0 on success. |
| 249 | */ |
| 250 | int qcom_scm_pas_auth_and_reset(u32 peripheral) |
| 251 | { |
| 252 | int ret; |
| 253 | |
| 254 | ret = qcom_scm_clk_enable(); |
| 255 | if (ret) |
| 256 | return ret; |
| 257 | |
| 258 | ret = __qcom_scm_pas_auth_and_reset(__scm->dev, peripheral); |
| 259 | qcom_scm_clk_disable(); |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | EXPORT_SYMBOL(qcom_scm_pas_auth_and_reset); |
| 264 | |
| 265 | /** |
| 266 | * qcom_scm_pas_shutdown() - Shut down the remote processor |
| 267 | * @peripheral: peripheral id |
| 268 | * |
| 269 | * Returns 0 on success. |
| 270 | */ |
| 271 | int qcom_scm_pas_shutdown(u32 peripheral) |
| 272 | { |
| 273 | int ret; |
| 274 | |
| 275 | ret = qcom_scm_clk_enable(); |
| 276 | if (ret) |
| 277 | return ret; |
| 278 | |
| 279 | ret = __qcom_scm_pas_shutdown(__scm->dev, peripheral); |
| 280 | qcom_scm_clk_disable(); |
| 281 | |
| 282 | return ret; |
| 283 | } |
| 284 | EXPORT_SYMBOL(qcom_scm_pas_shutdown); |
| 285 | |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 286 | static int qcom_scm_probe(struct platform_device *pdev) |
| 287 | { |
| 288 | struct qcom_scm *scm; |
| 289 | int ret; |
| 290 | |
| 291 | scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL); |
| 292 | if (!scm) |
| 293 | return -ENOMEM; |
| 294 | |
| 295 | scm->core_clk = devm_clk_get(&pdev->dev, "core"); |
| 296 | if (IS_ERR(scm->core_clk)) { |
| 297 | if (PTR_ERR(scm->core_clk) == -EPROBE_DEFER) |
| 298 | return PTR_ERR(scm->core_clk); |
| 299 | |
| 300 | scm->core_clk = NULL; |
| 301 | } |
| 302 | |
| 303 | if (of_device_is_compatible(pdev->dev.of_node, "qcom,scm")) { |
| 304 | scm->iface_clk = devm_clk_get(&pdev->dev, "iface"); |
| 305 | if (IS_ERR(scm->iface_clk)) { |
| 306 | if (PTR_ERR(scm->iface_clk) != -EPROBE_DEFER) |
| 307 | dev_err(&pdev->dev, "failed to acquire iface clk\n"); |
| 308 | return PTR_ERR(scm->iface_clk); |
| 309 | } |
| 310 | |
| 311 | scm->bus_clk = devm_clk_get(&pdev->dev, "bus"); |
| 312 | if (IS_ERR(scm->bus_clk)) { |
| 313 | if (PTR_ERR(scm->bus_clk) != -EPROBE_DEFER) |
| 314 | dev_err(&pdev->dev, "failed to acquire bus clk\n"); |
| 315 | return PTR_ERR(scm->bus_clk); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | /* vote for max clk rate for highest performance */ |
| 320 | ret = clk_set_rate(scm->core_clk, INT_MAX); |
| 321 | if (ret) |
| 322 | return ret; |
| 323 | |
| 324 | __scm = scm; |
| 325 | __scm->dev = &pdev->dev; |
| 326 | |
Kumar Gala | 6b1751a | 2016-06-03 18:25:26 -0500 | [diff] [blame] | 327 | __qcom_scm_init(); |
| 328 | |
Andy Gross | d0f6fa7 | 2016-06-03 18:25:22 -0500 | [diff] [blame] | 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static const struct of_device_id qcom_scm_dt_match[] = { |
| 333 | { .compatible = "qcom,scm-apq8064",}, |
| 334 | { .compatible = "qcom,scm-msm8660",}, |
| 335 | { .compatible = "qcom,scm-msm8960",}, |
| 336 | { .compatible = "qcom,scm",}, |
| 337 | {} |
| 338 | }; |
| 339 | |
| 340 | MODULE_DEVICE_TABLE(of, qcom_scm_dt_match); |
| 341 | |
| 342 | static struct platform_driver qcom_scm_driver = { |
| 343 | .driver = { |
| 344 | .name = "qcom_scm", |
| 345 | .of_match_table = qcom_scm_dt_match, |
| 346 | }, |
| 347 | .probe = qcom_scm_probe, |
| 348 | }; |
| 349 | |
| 350 | static int __init qcom_scm_init(void) |
| 351 | { |
| 352 | struct device_node *np, *fw_np; |
| 353 | int ret; |
| 354 | |
| 355 | fw_np = of_find_node_by_name(NULL, "firmware"); |
| 356 | |
| 357 | if (!fw_np) |
| 358 | return -ENODEV; |
| 359 | |
| 360 | np = of_find_matching_node(fw_np, qcom_scm_dt_match); |
| 361 | |
| 362 | if (!np) { |
| 363 | of_node_put(fw_np); |
| 364 | return -ENODEV; |
| 365 | } |
| 366 | |
| 367 | of_node_put(np); |
| 368 | |
| 369 | ret = of_platform_populate(fw_np, qcom_scm_dt_match, NULL, NULL); |
| 370 | |
| 371 | of_node_put(fw_np); |
| 372 | |
| 373 | if (ret) |
| 374 | return ret; |
| 375 | |
| 376 | return platform_driver_register(&qcom_scm_driver); |
| 377 | } |
| 378 | |
| 379 | arch_initcall(qcom_scm_init); |
| 380 | |
| 381 | static void __exit qcom_scm_exit(void) |
| 382 | { |
| 383 | platform_driver_unregister(&qcom_scm_driver); |
| 384 | } |
| 385 | module_exit(qcom_scm_exit); |
| 386 | |
| 387 | MODULE_DESCRIPTION("Qualcomm SCM driver"); |
| 388 | MODULE_LICENSE("GPL v2"); |