1 /* Copyright (c) 2015, The Linux Foundation. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 */
12
13 #include <linux/io.h>
14 #include <linux/errno.h>
15 #include <linux/delay.h>
16 #include <linux/mutex.h>
17 #include <linux/slab.h>
18 #include <linux/types.h>
19 #include <linux/qcom_scm.h>
20 #include <linux/arm-smccc.h>
21 #include <linux/dma-mapping.h>
22
23 #include "qcom_scm.h"
24
25 #define QCOM_SCM_FNID(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF))
26
27 #define MAX_QCOM_SCM_ARGS 10
28 #define MAX_QCOM_SCM_RETS 3
29
30 enum qcom_scm_arg_types {
31 QCOM_SCM_VAL,
32 QCOM_SCM_RO,
33 QCOM_SCM_RW,
34 QCOM_SCM_BUFVAL,
35 };
36
37 #define QCOM_SCM_ARGS_IMPL(num, a, b, c, d, e, f, g, h, i, j, ...) (\
38 (((a) & 0x3) << 4) | \
39 (((b) & 0x3) << 6) | \
40 (((c) & 0x3) << 8) | \
41 (((d) & 0x3) << 10) | \
42 (((e) & 0x3) << 12) | \
43 (((f) & 0x3) << 14) | \
44 (((g) & 0x3) << 16) | \
45 (((h) & 0x3) << 18) | \
46 (((i) & 0x3) << 20) | \
47 (((j) & 0x3) << 22) | \
48 ((num) & 0xf))
49
50 #define QCOM_SCM_ARGS(...) QCOM_SCM_ARGS_IMPL(__VA_ARGS__, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
51
52 /**
53 * struct qcom_scm_desc
54 * @arginfo: Metadata describing the arguments in args[]
55 * @args: The array of arguments for the secure syscall
56 * @res: The values returned by the secure syscall
57 */
58 struct qcom_scm_desc {
59 u32 arginfo;
60 u64 args[MAX_QCOM_SCM_ARGS];
61 };
62
63 static u64 qcom_smccc_convention = -1;
64 static DEFINE_MUTEX(qcom_scm_lock);
65
66 #define QCOM_SCM_EBUSY_WAIT_MS 30
67 #define QCOM_SCM_EBUSY_MAX_RETRY 20
68
69 #define N_EXT_QCOM_SCM_ARGS 7
70 #define FIRST_EXT_ARG_IDX 3
71 #define N_REGISTER_ARGS (MAX_QCOM_SCM_ARGS - N_EXT_QCOM_SCM_ARGS + 1)
72
73 /**
74 * qcom_scm_call() - Invoke a syscall in the secure world
75 * @dev: device
76 * @svc_id: service identifier
77 * @cmd_id: command identifier
78 * @desc: Descriptor structure containing arguments and return values
79 *
80 * Sends a command to the SCM and waits for the command to finish processing.
81 * This should *only* be called in pre-emptible context.
82 */
qcom_scm_call(struct device * dev,u32 svc_id,u32 cmd_id,const struct qcom_scm_desc * desc,struct arm_smccc_res * res)83 static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
84 const struct qcom_scm_desc *desc,
85 struct arm_smccc_res *res)
86 {
87 int arglen = desc->arginfo & 0xf;
88 int retry_count = 0, i;
89 u32 fn_id = QCOM_SCM_FNID(svc_id, cmd_id);
90 u64 cmd, x5 = desc->args[FIRST_EXT_ARG_IDX];
91 dma_addr_t args_phys = 0;
92 void *args_virt = NULL;
93 size_t alloc_len;
94 struct arm_smccc_quirk quirk = {.id = ARM_SMCCC_QUIRK_QCOM_A6};
95
96 if (unlikely(arglen > N_REGISTER_ARGS)) {
97 alloc_len = N_EXT_QCOM_SCM_ARGS * sizeof(u64);
98 args_virt = kzalloc(PAGE_ALIGN(alloc_len), GFP_KERNEL);
99
100 if (!args_virt)
101 return -ENOMEM;
102
103 if (qcom_smccc_convention == ARM_SMCCC_SMC_32) {
104 __le32 *args = args_virt;
105
106 for (i = 0; i < N_EXT_QCOM_SCM_ARGS; i++)
107 args[i] = cpu_to_le32(desc->args[i +
108 FIRST_EXT_ARG_IDX]);
109 } else {
110 __le64 *args = args_virt;
111
112 for (i = 0; i < N_EXT_QCOM_SCM_ARGS; i++)
113 args[i] = cpu_to_le64(desc->args[i +
114 FIRST_EXT_ARG_IDX]);
115 }
116
117 args_phys = dma_map_single(dev, args_virt, alloc_len,
118 DMA_TO_DEVICE);
119
120 if (dma_mapping_error(dev, args_phys)) {
121 kfree(args_virt);
122 return -ENOMEM;
123 }
124
125 x5 = args_phys;
126 }
127
128 do {
129 mutex_lock(&qcom_scm_lock);
130
131 cmd = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL,
132 qcom_smccc_convention,
133 ARM_SMCCC_OWNER_SIP, fn_id);
134
135 quirk.state.a6 = 0;
136
137 do {
138 arm_smccc_smc_quirk(cmd, desc->arginfo, desc->args[0],
139 desc->args[1], desc->args[2], x5,
140 quirk.state.a6, 0, res, &quirk);
141
142 if (res->a0 == QCOM_SCM_INTERRUPTED)
143 cmd = res->a0;
144
145 } while (res->a0 == QCOM_SCM_INTERRUPTED);
146
147 mutex_unlock(&qcom_scm_lock);
148
149 if (res->a0 == QCOM_SCM_V2_EBUSY) {
150 if (retry_count++ > QCOM_SCM_EBUSY_MAX_RETRY)
151 break;
152 msleep(QCOM_SCM_EBUSY_WAIT_MS);
153 }
154 } while (res->a0 == QCOM_SCM_V2_EBUSY);
155
156 if (args_virt) {
157 dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE);
158 kfree(args_virt);
159 }
160
161 if ((long)res->a0 < 0)
162 return qcom_scm_remap_error(res->a0);
163
164 return 0;
165 }
166
167 /**
168 * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
169 * @entry: Entry point function for the cpus
170 * @cpus: The cpumask of cpus that will use the entry point
171 *
172 * Set the cold boot address of the cpus. Any cpu outside the supported
173 * range would be removed from the cpu present mask.
174 */
__qcom_scm_set_cold_boot_addr(void * entry,const cpumask_t * cpus)175 int __qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
176 {
177 return -ENOTSUPP;
178 }
179
180 /**
181 * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus
182 * @dev: Device pointer
183 * @entry: Entry point function for the cpus
184 * @cpus: The cpumask of cpus that will use the entry point
185 *
186 * Set the Linux entry point for the SCM to transfer control to when coming
187 * out of a power down. CPU power down may be executed on cpuidle or hotplug.
188 */
__qcom_scm_set_warm_boot_addr(struct device * dev,void * entry,const cpumask_t * cpus)189 int __qcom_scm_set_warm_boot_addr(struct device *dev, void *entry,
190 const cpumask_t *cpus)
191 {
192 return -ENOTSUPP;
193 }
194
195 /**
196 * qcom_scm_cpu_power_down() - Power down the cpu
197 * @flags - Flags to flush cache
198 *
199 * This is an end point to power down cpu. If there was a pending interrupt,
200 * the control would return from this function, otherwise, the cpu jumps to the
201 * warm boot entry point set for this cpu upon reset.
202 */
__qcom_scm_cpu_power_down(u32 flags)203 void __qcom_scm_cpu_power_down(u32 flags)
204 {
205 }
206
__qcom_scm_is_call_available(struct device * dev,u32 svc_id,u32 cmd_id)207 int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, u32 cmd_id)
208 {
209 int ret;
210 struct qcom_scm_desc desc = {0};
211 struct arm_smccc_res res;
212
213 desc.arginfo = QCOM_SCM_ARGS(1);
214 desc.args[0] = QCOM_SCM_FNID(svc_id, cmd_id) |
215 (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT);
216
217 ret = qcom_scm_call(dev, QCOM_SCM_SVC_INFO, QCOM_IS_CALL_AVAIL_CMD,
218 &desc, &res);
219
220 return ret ? : res.a1;
221 }
222
__qcom_scm_hdcp_req(struct device * dev,struct qcom_scm_hdcp_req * req,u32 req_cnt,u32 * resp)223 int __qcom_scm_hdcp_req(struct device *dev, struct qcom_scm_hdcp_req *req,
224 u32 req_cnt, u32 *resp)
225 {
226 int ret;
227 struct qcom_scm_desc desc = {0};
228 struct arm_smccc_res res;
229
230 if (req_cnt > QCOM_SCM_HDCP_MAX_REQ_CNT)
231 return -ERANGE;
232
233 desc.args[0] = req[0].addr;
234 desc.args[1] = req[0].val;
235 desc.args[2] = req[1].addr;
236 desc.args[3] = req[1].val;
237 desc.args[4] = req[2].addr;
238 desc.args[5] = req[2].val;
239 desc.args[6] = req[3].addr;
240 desc.args[7] = req[3].val;
241 desc.args[8] = req[4].addr;
242 desc.args[9] = req[4].val;
243 desc.arginfo = QCOM_SCM_ARGS(10);
244
245 ret = qcom_scm_call(dev, QCOM_SCM_SVC_HDCP, QCOM_SCM_CMD_HDCP, &desc,
246 &res);
247 *resp = res.a1;
248
249 return ret;
250 }
251
__qcom_scm_init(void)252 void __qcom_scm_init(void)
253 {
254 u64 cmd;
255 struct arm_smccc_res res;
256 u32 function = QCOM_SCM_FNID(QCOM_SCM_SVC_INFO, QCOM_IS_CALL_AVAIL_CMD);
257
258 /* First try a SMC64 call */
259 cmd = ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64,
260 ARM_SMCCC_OWNER_SIP, function);
261
262 arm_smccc_smc(cmd, QCOM_SCM_ARGS(1), cmd & (~BIT(ARM_SMCCC_TYPE_SHIFT)),
263 0, 0, 0, 0, 0, &res);
264
265 if (!res.a0 && res.a1)
266 qcom_smccc_convention = ARM_SMCCC_SMC_64;
267 else
268 qcom_smccc_convention = ARM_SMCCC_SMC_32;
269 }
270
__qcom_scm_pas_supported(struct device * dev,u32 peripheral)271 bool __qcom_scm_pas_supported(struct device *dev, u32 peripheral)
272 {
273 int ret;
274 struct qcom_scm_desc desc = {0};
275 struct arm_smccc_res res;
276
277 desc.args[0] = peripheral;
278 desc.arginfo = QCOM_SCM_ARGS(1);
279
280 ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
281 QCOM_SCM_PAS_IS_SUPPORTED_CMD,
282 &desc, &res);
283
284 return ret ? false : !!res.a1;
285 }
286
__qcom_scm_pas_init_image(struct device * dev,u32 peripheral,dma_addr_t metadata_phys)287 int __qcom_scm_pas_init_image(struct device *dev, u32 peripheral,
288 dma_addr_t metadata_phys)
289 {
290 int ret;
291 struct qcom_scm_desc desc = {0};
292 struct arm_smccc_res res;
293
294 desc.args[0] = peripheral;
295 desc.args[1] = metadata_phys;
296 desc.arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_VAL, QCOM_SCM_RW);
297
298 ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_INIT_IMAGE_CMD,
299 &desc, &res);
300
301 return ret ? : res.a1;
302 }
303
__qcom_scm_pas_mem_setup(struct device * dev,u32 peripheral,phys_addr_t addr,phys_addr_t size)304 int __qcom_scm_pas_mem_setup(struct device *dev, u32 peripheral,
305 phys_addr_t addr, phys_addr_t size)
306 {
307 int ret;
308 struct qcom_scm_desc desc = {0};
309 struct arm_smccc_res res;
310
311 desc.args[0] = peripheral;
312 desc.args[1] = addr;
313 desc.args[2] = size;
314 desc.arginfo = QCOM_SCM_ARGS(3);
315
316 ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_MEM_SETUP_CMD,
317 &desc, &res);
318
319 return ret ? : res.a1;
320 }
321
__qcom_scm_pas_auth_and_reset(struct device * dev,u32 peripheral)322 int __qcom_scm_pas_auth_and_reset(struct device *dev, u32 peripheral)
323 {
324 int ret;
325 struct qcom_scm_desc desc = {0};
326 struct arm_smccc_res res;
327
328 desc.args[0] = peripheral;
329 desc.arginfo = QCOM_SCM_ARGS(1);
330
331 ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
332 QCOM_SCM_PAS_AUTH_AND_RESET_CMD,
333 &desc, &res);
334
335 return ret ? : res.a1;
336 }
337
__qcom_scm_pas_shutdown(struct device * dev,u32 peripheral)338 int __qcom_scm_pas_shutdown(struct device *dev, u32 peripheral)
339 {
340 int ret;
341 struct qcom_scm_desc desc = {0};
342 struct arm_smccc_res res;
343
344 desc.args[0] = peripheral;
345 desc.arginfo = QCOM_SCM_ARGS(1);
346
347 ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_SHUTDOWN_CMD,
348 &desc, &res);
349
350 return ret ? : res.a1;
351 }
352
__qcom_scm_pas_mss_reset(struct device * dev,bool reset)353 int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
354 {
355 struct qcom_scm_desc desc = {0};
356 struct arm_smccc_res res;
357 int ret;
358
359 desc.args[0] = reset;
360 desc.args[1] = 0;
361 desc.arginfo = QCOM_SCM_ARGS(2);
362
363 ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_MSS_RESET, &desc,
364 &res);
365
366 return ret ? : res.a1;
367 }
368
__qcom_scm_set_remote_state(struct device * dev,u32 state,u32 id)369 int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id)
370 {
371 struct qcom_scm_desc desc = {0};
372 struct arm_smccc_res res;
373 int ret;
374
375 desc.args[0] = state;
376 desc.args[1] = id;
377 desc.arginfo = QCOM_SCM_ARGS(2);
378
379 ret = qcom_scm_call(dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_SET_REMOTE_STATE,
380 &desc, &res);
381
382 return ret ? : res.a1;
383 }
384
__qcom_scm_restore_sec_cfg(struct device * dev,u32 device_id,u32 spare)385 int __qcom_scm_restore_sec_cfg(struct device *dev, u32 device_id, u32 spare)
386 {
387 struct qcom_scm_desc desc = {0};
388 struct arm_smccc_res res;
389 int ret;
390
391 desc.args[0] = device_id;
392 desc.args[1] = spare;
393 desc.arginfo = QCOM_SCM_ARGS(2);
394
395 ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP, QCOM_SCM_RESTORE_SEC_CFG,
396 &desc, &res);
397
398 return ret ? : res.a1;
399 }
400
__qcom_scm_iommu_secure_ptbl_size(struct device * dev,u32 spare,size_t * size)401 int __qcom_scm_iommu_secure_ptbl_size(struct device *dev, u32 spare,
402 size_t *size)
403 {
404 struct qcom_scm_desc desc = {0};
405 struct arm_smccc_res res;
406 int ret;
407
408 desc.args[0] = spare;
409 desc.arginfo = QCOM_SCM_ARGS(1);
410
411 ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP,
412 QCOM_SCM_IOMMU_SECURE_PTBL_SIZE, &desc, &res);
413
414 if (size)
415 *size = res.a1;
416
417 return ret ? : res.a2;
418 }
419
__qcom_scm_iommu_secure_ptbl_init(struct device * dev,u64 addr,u32 size,u32 spare)420 int __qcom_scm_iommu_secure_ptbl_init(struct device *dev, u64 addr, u32 size,
421 u32 spare)
422 {
423 struct qcom_scm_desc desc = {0};
424 struct arm_smccc_res res;
425 int ret;
426
427 desc.args[0] = addr;
428 desc.args[1] = size;
429 desc.args[2] = spare;
430 desc.arginfo = QCOM_SCM_ARGS(3, QCOM_SCM_RW, QCOM_SCM_VAL,
431 QCOM_SCM_VAL);
432
433 ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP,
434 QCOM_SCM_IOMMU_SECURE_PTBL_INIT, &desc, &res);
435
436 /* the pg table has been initialized already, ignore the error */
437 if (ret == -EPERM)
438 ret = 0;
439
440 return ret;
441 }
442