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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
30enum 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 */
58struct qcom_scm_desc {
59 u32 arginfo;
60 u64 args[MAX_QCOM_SCM_ARGS];
61};
62
63static u64 qcom_smccc_convention = -1;
64static 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*/
83static 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 (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 */
175int __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 */
189int __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 */
203void __qcom_scm_cpu_power_down(u32 flags)
204{
205}
206
207int __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
223int __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
252void __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
271bool __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
287int __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
304int __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
322int __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
338int __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
353int __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
369int __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
385int __qcom_scm_assign_mem(struct device *dev, phys_addr_t mem_region,
386 size_t mem_sz, phys_addr_t src, size_t src_sz,
387 phys_addr_t dest, size_t dest_sz)
388{
389 int ret;
390 struct qcom_scm_desc desc = {0};
391 struct arm_smccc_res res;
392
393 desc.args[0] = mem_region;
394 desc.args[1] = mem_sz;
395 desc.args[2] = src;
396 desc.args[3] = src_sz;
397 desc.args[4] = dest;
398 desc.args[5] = dest_sz;
399 desc.args[6] = 0;
400
401 desc.arginfo = QCOM_SCM_ARGS(7, QCOM_SCM_RO, QCOM_SCM_VAL,
402 QCOM_SCM_RO, QCOM_SCM_VAL, QCOM_SCM_RO,
403 QCOM_SCM_VAL, QCOM_SCM_VAL);
404
405 ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP,
406 QCOM_MEM_PROT_ASSIGN_ID,
407 &desc, &res);
408
409 return ret ? : res.a1;
410}
411
412int __qcom_scm_restore_sec_cfg(struct device *dev, u32 device_id, u32 spare)
413{
414 struct qcom_scm_desc desc = {0};
415 struct arm_smccc_res res;
416 int ret;
417
418 desc.args[0] = device_id;
419 desc.args[1] = spare;
420 desc.arginfo = QCOM_SCM_ARGS(2);
421
422 ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP, QCOM_SCM_RESTORE_SEC_CFG,
423 &desc, &res);
424
425 return ret ? : res.a1;
426}
427
428int __qcom_scm_iommu_secure_ptbl_size(struct device *dev, u32 spare,
429 size_t *size)
430{
431 struct qcom_scm_desc desc = {0};
432 struct arm_smccc_res res;
433 int ret;
434
435 desc.args[0] = spare;
436 desc.arginfo = QCOM_SCM_ARGS(1);
437
438 ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP,
439 QCOM_SCM_IOMMU_SECURE_PTBL_SIZE, &desc, &res);
440
441 if (size)
442 *size = res.a1;
443
444 return ret ? : res.a2;
445}
446
447int __qcom_scm_iommu_secure_ptbl_init(struct device *dev, u64 addr, u32 size,
448 u32 spare)
449{
450 struct qcom_scm_desc desc = {0};
451 struct arm_smccc_res res;
452 int ret;
453
454 desc.args[0] = addr;
455 desc.args[1] = size;
456 desc.args[2] = spare;
457 desc.arginfo = QCOM_SCM_ARGS(3, QCOM_SCM_RW, QCOM_SCM_VAL,
458 QCOM_SCM_VAL);
459
460 ret = qcom_scm_call(dev, QCOM_SCM_SVC_MP,
461 QCOM_SCM_IOMMU_SECURE_PTBL_INIT, &desc, &res);
462
463 /* the pg table has been initialized already, ignore the error */
464 if (ret == -EPERM)
465 ret = 0;
466
467 return ret;
468}
469
470int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
471{
472 struct qcom_scm_desc desc = {0};
473 struct arm_smccc_res res;
474
475 desc.args[0] = QCOM_SCM_SET_DLOAD_MODE;
476 desc.args[1] = enable ? QCOM_SCM_SET_DLOAD_MODE : 0;
477 desc.arginfo = QCOM_SCM_ARGS(2);
478
479 return qcom_scm_call(dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_SET_DLOAD_MODE,
480 &desc, &res);
481}
482
483int __qcom_scm_io_readl(struct device *dev, phys_addr_t addr,
484 unsigned int *val)
485{
486 struct qcom_scm_desc desc = {0};
487 struct arm_smccc_res res;
488 int ret;
489
490 desc.args[0] = addr;
491 desc.arginfo = QCOM_SCM_ARGS(1);
492
493 ret = qcom_scm_call(dev, QCOM_SCM_SVC_IO, QCOM_SCM_IO_READ,
494 &desc, &res);
495 if (ret >= 0)
496 *val = res.a1;
497
498 return ret < 0 ? ret : 0;
499}
500
501int __qcom_scm_io_writel(struct device *dev, phys_addr_t addr, unsigned int val)
502{
503 struct qcom_scm_desc desc = {0};
504 struct arm_smccc_res res;
505
506 desc.args[0] = addr;
507 desc.args[1] = val;
508 desc.arginfo = QCOM_SCM_ARGS(2);
509
510 return qcom_scm_call(dev, QCOM_SCM_SVC_IO, QCOM_SCM_IO_WRITE,
511 &desc, &res);
512}