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17#include <linux/kernel.h>
18#include <linux/module.h>
19
20#include <linux/crypto.h>
21#include <crypto/algapi.h>
22#include <crypto/aes.h>
23#include <crypto/sha.h>
24#include <crypto/aead.h>
25#include <crypto/authenc.h>
26#include <crypto/scatterwalk.h>
27#include <crypto/internal/skcipher.h>
28
29#include <linux/init.h>
30#include <linux/moduleparam.h>
31#include <linux/types.h>
32#include <linux/random.h>
33#include <linux/ioport.h>
34#include <linux/interrupt.h>
35#include <linux/fcntl.h>
36#include <linux/poll.h>
37#include <linux/proc_fs.h>
38#include <linux/mutex.h>
39#include <linux/sysctl.h>
40#include <linux/fs.h>
41#include <linux/cdev.h>
42#include <linux/platform_device.h>
43#include <linux/mm.h>
44#include <linux/delay.h>
45#include <linux/dma-mapping.h>
46#include <linux/dmapool.h>
47#include <linux/list.h>
48#include <linux/slab.h>
49#include <linux/spinlock.h>
50#include <linux/pm.h>
51
52
53#include <linux/cache.h>
54#include <linux/io.h>
55#include <linux/uaccess.h>
56#include <linux/pagemap.h>
57#include <linux/sched.h>
58#include <linux/random.h>
59#include <linux/of.h>
60#include <linux/clk.h>
61#include <linux/of_address.h>
62
63#include "ssi_config.h"
64#include "ssi_driver.h"
65#include "ssi_request_mgr.h"
66#include "ssi_buffer_mgr.h"
67#include "ssi_sysfs.h"
68#include "ssi_cipher.h"
69#include "ssi_aead.h"
70#include "ssi_hash.h"
71#include "ssi_ivgen.h"
72#include "ssi_sram_mgr.h"
73#include "ssi_pm.h"
74#include "ssi_fips.h"
75
76#ifdef DX_DUMP_BYTES
77void dump_byte_array(const char *name, const u8 *the_array, unsigned long size)
78{
79 int i, line_offset = 0, ret = 0;
80 const u8 *cur_byte;
81 char line_buf[80];
82
83 if (!the_array) {
84 SSI_LOG_ERR("cannot dump array - NULL pointer\n");
85 return;
86 }
87
88 ret = snprintf(line_buf, sizeof(line_buf), "%s[%lu]: ", name, size);
89 if (ret < 0) {
90 SSI_LOG_ERR("snprintf returned %d . aborting buffer array dump\n", ret);
91 return;
92 }
93 line_offset = ret;
94 for (i = 0, cur_byte = the_array;
95 (i < size) && (line_offset < sizeof(line_buf)); i++, cur_byte++) {
96 ret = snprintf(line_buf + line_offset,
97 sizeof(line_buf) - line_offset,
98 "0x%02X ", *cur_byte);
99 if (ret < 0) {
100 SSI_LOG_ERR("snprintf returned %d . aborting buffer array dump\n", ret);
101 return;
102 }
103 line_offset += ret;
104 if (line_offset > 75) {
105 SSI_LOG_DEBUG("%s\n", line_buf);
106 line_offset = 0;
107 }
108 }
109
110 if (line_offset > 0)
111 SSI_LOG_DEBUG("%s\n", line_buf);
112}
113#endif
114
115static irqreturn_t cc_isr(int irq, void *dev_id)
116{
117 struct ssi_drvdata *drvdata = (struct ssi_drvdata *)dev_id;
118 void __iomem *cc_base = drvdata->cc_base;
119 u32 irr;
120 u32 imr;
121
122
123
124
125 irr = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IRR));
126 SSI_LOG_DEBUG("Got IRR=0x%08X\n", irr);
127 if (unlikely(irr == 0)) {
128 SSI_LOG_ERR("Got interrupt with empty IRR\n");
129 return IRQ_NONE;
130 }
131 imr = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IMR));
132
133
134 CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_ICR), irr);
135
136 drvdata->irq = irr;
137
138 if (likely((irr & SSI_COMP_IRQ_MASK) != 0)) {
139
140 CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IMR), imr | SSI_COMP_IRQ_MASK);
141 irr &= ~SSI_COMP_IRQ_MASK;
142 complete_request(drvdata);
143 }
144#ifdef CC_SUPPORT_FIPS
145
146 if (likely((irr & SSI_GPR0_IRQ_MASK) != 0)) {
147
148 CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IMR), imr | SSI_GPR0_IRQ_MASK);
149 irr &= ~SSI_GPR0_IRQ_MASK;
150 fips_handler(drvdata);
151 }
152#endif
153
154 if (unlikely((irr & SSI_AXI_ERR_IRQ_MASK) != 0)) {
155 u32 axi_err;
156
157
158 axi_err = CC_HAL_READ_REGISTER(CC_REG_OFFSET(CRY_KERNEL, AXIM_MON_ERR));
159 SSI_LOG_DEBUG("AXI completion error: axim_mon_err=0x%08X\n", axi_err);
160
161 irr &= ~SSI_AXI_ERR_IRQ_MASK;
162 }
163
164 if (unlikely(irr != 0)) {
165 SSI_LOG_DEBUG("IRR includes unknown cause bits (0x%08X)\n", irr);
166
167 }
168
169 return IRQ_HANDLED;
170}
171
172int init_cc_regs(struct ssi_drvdata *drvdata, bool is_probe)
173{
174 unsigned int val, cache_params;
175 void __iomem *cc_base = drvdata->cc_base;
176
177
178 val = CC_HAL_READ_REGISTER(CC_REG_OFFSET(CRY_KERNEL, AXIM_CFG));
179 CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(CRY_KERNEL, AXIM_CFG), val & ~SSI_AXI_IRQ_MASK);
180 SSI_LOG_DEBUG("AXIM_CFG=0x%08X\n", CC_HAL_READ_REGISTER(CC_REG_OFFSET(CRY_KERNEL, AXIM_CFG)));
181
182
183 val = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IRR));
184 SSI_LOG_DEBUG("IRR=0x%08X\n", val);
185 CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_ICR), val);
186
187
188 val = (~(SSI_COMP_IRQ_MASK | SSI_AXI_ERR_IRQ_MASK | SSI_GPR0_IRQ_MASK));
189 CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IMR), val);
190
191#ifdef DX_HOST_IRQ_TIMER_INIT_VAL_REG_OFFSET
192#ifdef DX_IRQ_DELAY
193
194 CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IRQ_TIMER_INIT_VAL),
195 DX_IRQ_DELAY);
196#endif
197 if (CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IRQ_TIMER_INIT_VAL)) > 0) {
198 SSI_LOG_DEBUG("irq_delay=%d CC cycles\n",
199 CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_IRQ_TIMER_INIT_VAL)));
200 }
201#endif
202
203 cache_params = (drvdata->coherent ? CC_COHERENT_CACHE_PARAMS : 0x0);
204
205 val = CC_HAL_READ_REGISTER(CC_REG_OFFSET(CRY_KERNEL, AXIM_CACHE_PARAMS));
206
207 if (is_probe)
208 SSI_LOG_INFO("Cache params previous: 0x%08X\n", val);
209
210 CC_HAL_WRITE_REGISTER(CC_REG_OFFSET(CRY_KERNEL, AXIM_CACHE_PARAMS),
211 cache_params);
212 val = CC_HAL_READ_REGISTER(CC_REG_OFFSET(CRY_KERNEL, AXIM_CACHE_PARAMS));
213
214 if (is_probe)
215 SSI_LOG_INFO("Cache params current: 0x%08X (expect: 0x%08X)\n",
216 val, cache_params);
217
218 return 0;
219}
220
221static int init_cc_resources(struct platform_device *plat_dev)
222{
223 struct resource *req_mem_cc_regs = NULL;
224 void __iomem *cc_base = NULL;
225 bool irq_registered = false;
226 struct ssi_drvdata *new_drvdata = kzalloc(sizeof(*new_drvdata),
227 GFP_KERNEL);
228 struct device *dev = &plat_dev->dev;
229 struct device_node *np = dev->of_node;
230 u32 signature_val;
231 int rc = 0;
232
233 if (unlikely(!new_drvdata)) {
234 SSI_LOG_ERR("Failed to allocate drvdata");
235 rc = -ENOMEM;
236 goto init_cc_res_err;
237 }
238
239 new_drvdata->clk = of_clk_get(np, 0);
240 new_drvdata->coherent = of_dma_is_coherent(np);
241
242
243 new_drvdata->inflight_counter = 0;
244
245 dev_set_drvdata(&plat_dev->dev, new_drvdata);
246
247
248 new_drvdata->res_mem = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
249 if (unlikely(!new_drvdata->res_mem)) {
250 SSI_LOG_ERR("Failed getting IO memory resource\n");
251 rc = -ENODEV;
252 goto init_cc_res_err;
253 }
254 SSI_LOG_DEBUG("Got MEM resource (%s): start=%pad end=%pad\n",
255 new_drvdata->res_mem->name,
256 new_drvdata->res_mem->start,
257 new_drvdata->res_mem->end);
258
259 req_mem_cc_regs = request_mem_region(new_drvdata->res_mem->start, resource_size(new_drvdata->res_mem), "arm_cc7x_regs");
260 if (unlikely(!req_mem_cc_regs)) {
261 SSI_LOG_ERR("Couldn't allocate registers memory region at "
262 "0x%08X\n", (unsigned int)new_drvdata->res_mem->start);
263 rc = -EBUSY;
264 goto init_cc_res_err;
265 }
266 cc_base = ioremap(new_drvdata->res_mem->start, resource_size(new_drvdata->res_mem));
267 if (unlikely(!cc_base)) {
268 SSI_LOG_ERR("ioremap[CC](0x%08X,0x%08X) failed\n",
269 (unsigned int)new_drvdata->res_mem->start,
270 (unsigned int)resource_size(new_drvdata->res_mem));
271 rc = -ENOMEM;
272 goto init_cc_res_err;
273 }
274 SSI_LOG_DEBUG("CC registers mapped from %pa to 0x%p\n", &new_drvdata->res_mem->start, cc_base);
275 new_drvdata->cc_base = cc_base;
276
277
278 new_drvdata->res_irq = platform_get_resource(plat_dev, IORESOURCE_IRQ, 0);
279 if (unlikely(!new_drvdata->res_irq)) {
280 SSI_LOG_ERR("Failed getting IRQ resource\n");
281 rc = -ENODEV;
282 goto init_cc_res_err;
283 }
284 rc = request_irq(new_drvdata->res_irq->start, cc_isr,
285 IRQF_SHARED, "arm_cc7x", new_drvdata);
286 if (unlikely(rc != 0)) {
287 SSI_LOG_ERR("Could not register to interrupt %llu\n",
288 (unsigned long long)new_drvdata->res_irq->start);
289 goto init_cc_res_err;
290 }
291 init_completion(&new_drvdata->icache_setup_completion);
292
293 irq_registered = true;
294 SSI_LOG_DEBUG("Registered to IRQ (%s) %llu\n",
295 new_drvdata->res_irq->name,
296 (unsigned long long)new_drvdata->res_irq->start);
297
298 new_drvdata->plat_dev = plat_dev;
299
300 rc = cc_clk_on(new_drvdata);
301 if (rc)
302 goto init_cc_res_err;
303
304 if (!new_drvdata->plat_dev->dev.dma_mask)
305 new_drvdata->plat_dev->dev.dma_mask = &new_drvdata->plat_dev->dev.coherent_dma_mask;
306
307 if (!new_drvdata->plat_dev->dev.coherent_dma_mask)
308 new_drvdata->plat_dev->dev.coherent_dma_mask = DMA_BIT_MASK(DMA_BIT_MASK_LEN);
309
310
311 signature_val = CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_SIGNATURE));
312 if (signature_val != DX_DEV_SIGNATURE) {
313 SSI_LOG_ERR("Invalid CC signature: SIGNATURE=0x%08X != expected=0x%08X\n",
314 signature_val, (u32)DX_DEV_SIGNATURE);
315 rc = -EINVAL;
316 goto init_cc_res_err;
317 }
318 SSI_LOG_DEBUG("CC SIGNATURE=0x%08X\n", signature_val);
319
320
321 SSI_LOG(KERN_INFO, "ARM CryptoCell %s Driver: HW version 0x%08X, Driver version %s\n", SSI_DEV_NAME_STR,
322 CC_HAL_READ_REGISTER(CC_REG_OFFSET(HOST_RGF, HOST_VERSION)), DRV_MODULE_VERSION);
323
324 rc = init_cc_regs(new_drvdata, true);
325 if (unlikely(rc != 0)) {
326 SSI_LOG_ERR("init_cc_regs failed\n");
327 goto init_cc_res_err;
328 }
329
330#ifdef ENABLE_CC_SYSFS
331 rc = ssi_sysfs_init(&plat_dev->dev.kobj, new_drvdata);
332 if (unlikely(rc != 0)) {
333 SSI_LOG_ERR("init_stat_db failed\n");
334 goto init_cc_res_err;
335 }
336#endif
337
338 rc = ssi_sram_mgr_init(new_drvdata);
339 if (unlikely(rc != 0)) {
340 SSI_LOG_ERR("ssi_sram_mgr_init failed\n");
341 goto init_cc_res_err;
342 }
343
344 new_drvdata->mlli_sram_addr =
345 ssi_sram_mgr_alloc(new_drvdata, MAX_MLLI_BUFF_SIZE);
346 if (unlikely(new_drvdata->mlli_sram_addr == NULL_SRAM_ADDR)) {
347 SSI_LOG_ERR("Failed to alloc MLLI Sram buffer\n");
348 rc = -ENOMEM;
349 goto init_cc_res_err;
350 }
351
352 rc = request_mgr_init(new_drvdata);
353 if (unlikely(rc != 0)) {
354 SSI_LOG_ERR("request_mgr_init failed\n");
355 goto init_cc_res_err;
356 }
357
358 rc = ssi_buffer_mgr_init(new_drvdata);
359 if (unlikely(rc != 0)) {
360 SSI_LOG_ERR("buffer_mgr_init failed\n");
361 goto init_cc_res_err;
362 }
363
364 rc = ssi_power_mgr_init(new_drvdata);
365 if (unlikely(rc != 0)) {
366 SSI_LOG_ERR("ssi_power_mgr_init failed\n");
367 goto init_cc_res_err;
368 }
369
370 rc = ssi_fips_init(new_drvdata);
371 if (unlikely(rc != 0)) {
372 SSI_LOG_ERR("SSI_FIPS_INIT failed 0x%x\n", rc);
373 goto init_cc_res_err;
374 }
375
376 rc = ssi_ivgen_init(new_drvdata);
377 if (unlikely(rc != 0)) {
378 SSI_LOG_ERR("ssi_ivgen_init failed\n");
379 goto init_cc_res_err;
380 }
381
382
383 rc = ssi_ablkcipher_alloc(new_drvdata);
384 if (unlikely(rc != 0)) {
385 SSI_LOG_ERR("ssi_ablkcipher_alloc failed\n");
386 goto init_cc_res_err;
387 }
388
389
390 rc = ssi_hash_alloc(new_drvdata);
391 if (unlikely(rc != 0)) {
392 SSI_LOG_ERR("ssi_hash_alloc failed\n");
393 goto init_cc_res_err;
394 }
395
396 rc = ssi_aead_alloc(new_drvdata);
397 if (unlikely(rc != 0)) {
398 SSI_LOG_ERR("ssi_aead_alloc failed\n");
399 goto init_cc_res_err;
400 }
401
402
403
404
405
406 cc_set_ree_fips_status(new_drvdata, true);
407
408 return 0;
409
410init_cc_res_err:
411 SSI_LOG_ERR("Freeing CC HW resources!\n");
412
413 if (new_drvdata) {
414 ssi_aead_free(new_drvdata);
415 ssi_hash_free(new_drvdata);
416 ssi_ablkcipher_free(new_drvdata);
417 ssi_ivgen_fini(new_drvdata);
418 ssi_power_mgr_fini(new_drvdata);
419 ssi_buffer_mgr_fini(new_drvdata);
420 request_mgr_fini(new_drvdata);
421 ssi_sram_mgr_fini(new_drvdata);
422 ssi_fips_fini(new_drvdata);
423#ifdef ENABLE_CC_SYSFS
424 ssi_sysfs_fini();
425#endif
426
427 if (req_mem_cc_regs) {
428 if (irq_registered) {
429 free_irq(new_drvdata->res_irq->start, new_drvdata);
430 new_drvdata->res_irq = NULL;
431 iounmap(cc_base);
432 new_drvdata->cc_base = NULL;
433 }
434 release_mem_region(new_drvdata->res_mem->start,
435 resource_size(new_drvdata->res_mem));
436 new_drvdata->res_mem = NULL;
437 }
438 kfree(new_drvdata);
439 dev_set_drvdata(&plat_dev->dev, NULL);
440 }
441
442 return rc;
443}
444
445void fini_cc_regs(struct ssi_drvdata *drvdata)
446{
447
448 WRITE_REGISTER(drvdata->cc_base +
449 CC_REG_OFFSET(HOST_RGF, HOST_IMR), 0xFFFFFFFF);
450}
451
452static void cleanup_cc_resources(struct platform_device *plat_dev)
453{
454 struct ssi_drvdata *drvdata =
455 (struct ssi_drvdata *)dev_get_drvdata(&plat_dev->dev);
456
457 ssi_aead_free(drvdata);
458 ssi_hash_free(drvdata);
459 ssi_ablkcipher_free(drvdata);
460 ssi_ivgen_fini(drvdata);
461 ssi_power_mgr_fini(drvdata);
462 ssi_buffer_mgr_fini(drvdata);
463 request_mgr_fini(drvdata);
464 ssi_sram_mgr_fini(drvdata);
465 ssi_fips_fini(drvdata);
466#ifdef ENABLE_CC_SYSFS
467 ssi_sysfs_fini();
468#endif
469
470 fini_cc_regs(drvdata);
471 cc_clk_off(drvdata);
472 free_irq(drvdata->res_irq->start, drvdata);
473 drvdata->res_irq = NULL;
474
475 if (drvdata->cc_base) {
476 iounmap(drvdata->cc_base);
477 release_mem_region(drvdata->res_mem->start,
478 resource_size(drvdata->res_mem));
479 drvdata->cc_base = NULL;
480 drvdata->res_mem = NULL;
481 }
482
483 kfree(drvdata);
484 dev_set_drvdata(&plat_dev->dev, NULL);
485}
486
487int cc_clk_on(struct ssi_drvdata *drvdata)
488{
489 struct clk *clk = drvdata->clk;
490 int rc;
491
492 if (IS_ERR(clk))
493
494 return 0;
495
496 rc = clk_prepare_enable(clk);
497 if (rc)
498 return rc;
499
500 return 0;
501}
502
503void cc_clk_off(struct ssi_drvdata *drvdata)
504{
505 struct clk *clk = drvdata->clk;
506
507 if (IS_ERR(clk))
508
509 return;
510
511 clk_disable_unprepare(clk);
512}
513
514static int cc7x_probe(struct platform_device *plat_dev)
515{
516 int rc;
517#if defined(CONFIG_ARM) && defined(CC_DEBUG)
518 u32 ctr, cacheline_size;
519
520 asm volatile("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
521 cacheline_size = 4 << ((ctr >> 16) & 0xf);
522 SSI_LOG_DEBUG("CP15(L1_CACHE_BYTES) = %u , Kconfig(L1_CACHE_BYTES) = %u\n",
523 cacheline_size, L1_CACHE_BYTES);
524
525 asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r" (ctr));
526 SSI_LOG_DEBUG("Main ID register (MIDR): Implementer 0x%02X, Arch 0x%01X, Part 0x%03X, Rev r%dp%d\n",
527 (ctr >> 24), (ctr >> 16) & 0xF, (ctr >> 4) & 0xFFF,
528 (ctr >> 20) & 0xF, ctr & 0xF);
529#endif
530
531
532 rc = init_cc_resources(plat_dev);
533 if (rc != 0)
534 return rc;
535
536 SSI_LOG(KERN_INFO, "ARM cc7x_ree device initialized\n");
537
538 return 0;
539}
540
541static int cc7x_remove(struct platform_device *plat_dev)
542{
543 SSI_LOG_DEBUG("Releasing cc7x resources...\n");
544
545 cleanup_cc_resources(plat_dev);
546
547 SSI_LOG(KERN_INFO, "ARM cc7x_ree device terminated\n");
548
549 return 0;
550}
551
552#if defined(CONFIG_PM_RUNTIME) || defined(CONFIG_PM_SLEEP)
553static const struct dev_pm_ops arm_cc7x_driver_pm = {
554 SET_RUNTIME_PM_OPS(ssi_power_mgr_runtime_suspend, ssi_power_mgr_runtime_resume, NULL)
555};
556#endif
557
558#if defined(CONFIG_PM_RUNTIME) || defined(CONFIG_PM_SLEEP)
559#define DX_DRIVER_RUNTIME_PM (&arm_cc7x_driver_pm)
560#else
561#define DX_DRIVER_RUNTIME_PM NULL
562#endif
563
564#ifdef CONFIG_OF
565static const struct of_device_id arm_cc7x_dev_of_match[] = {
566 {.compatible = "arm,cryptocell-712-ree"},
567 {}
568};
569MODULE_DEVICE_TABLE(of, arm_cc7x_dev_of_match);
570#endif
571
572static struct platform_driver cc7x_driver = {
573 .driver = {
574 .name = "cc7xree",
575#ifdef CONFIG_OF
576 .of_match_table = arm_cc7x_dev_of_match,
577#endif
578 .pm = DX_DRIVER_RUNTIME_PM,
579 },
580 .probe = cc7x_probe,
581 .remove = cc7x_remove,
582};
583module_platform_driver(cc7x_driver);
584
585
586MODULE_DESCRIPTION("ARM TrustZone CryptoCell REE Driver");
587MODULE_VERSION(DRV_MODULE_VERSION);
588MODULE_AUTHOR("ARM");
589MODULE_LICENSE("GPL v2");
590
