Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/crypto/caam/ctrl.c

  1 /* * CAAM control-plane driver backend
  2  * Controller-level driver, kernel property detection, initialization
  3  *
  4  * Copyright 2008-2012 Freescale Semiconductor, Inc.
  5  */
  6 
  7 #include <linux/device.h>
  8 #include <linux/of_address.h>
  9 #include <linux/of_irq.h>
 10 
 11 #include "compat.h"
 12 #include "regs.h"
 13 #include "intern.h"
 14 #include "jr.h"
 15 #include "desc_constr.h"
 16 #include "error.h"
 17 #include "ctrl.h"
 18 
 19 bool caam_little_end;
 20 EXPORT_SYMBOL(caam_little_end);
 21 
 22 /*
 23  * i.MX targets tend to have clock control subsystems that can
 24  * enable/disable clocking to our device.
 25  */
 26 #ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_IMX
 27 static inline struct clk *caam_drv_identify_clk(struct device *dev,
 28                                                 char *clk_name)
 29 {
 30         return devm_clk_get(dev, clk_name);
 31 }
 32 #else
 33 static inline struct clk *caam_drv_identify_clk(struct device *dev,
 34                                                 char *clk_name)
 35 {
 36         return NULL;
 37 }
 38 #endif
 39 
 40 /*
 41  * Descriptor to instantiate RNG State Handle 0 in normal mode and
 42  * load the JDKEK, TDKEK and TDSK registers
 43  */
 44 static void build_instantiation_desc(u32 *desc, int handle, int do_sk)
 45 {
 46         u32 *jump_cmd, op_flags;
 47 
 48         init_job_desc(desc, 0);
 49 
 50         op_flags = OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
 51                         (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INIT;
 52 
 53         /* INIT RNG in non-test mode */
 54         append_operation(desc, op_flags);
 55 
 56         if (!handle && do_sk) {
 57                 /*
 58                  * For SH0, Secure Keys must be generated as well
 59                  */
 60 
 61                 /* wait for done */
 62                 jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
 63                 set_jump_tgt_here(desc, jump_cmd);
 64 
 65                 /*
 66                  * load 1 to clear written reg:
 67                  * resets the done interrrupt and returns the RNG to idle.
 68                  */
 69                 append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);
 70 
 71                 /* Initialize State Handle  */
 72                 append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
 73                                  OP_ALG_AAI_RNG4_SK);
 74         }
 75 
 76         append_jump(desc, JUMP_CLASS_CLASS1 | JUMP_TYPE_HALT);
 77 }
 78 
 79 /* Descriptor for deinstantiation of State Handle 0 of the RNG block. */
 80 static void build_deinstantiation_desc(u32 *desc, int handle)
 81 {
 82         init_job_desc(desc, 0);
 83 
 84         /* Uninstantiate State Handle 0 */
 85         append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
 86                          (handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INITFINAL);
 87 
 88         append_jump(desc, JUMP_CLASS_CLASS1 | JUMP_TYPE_HALT);
 89 }
 90 
 91 /*
 92  * run_descriptor_deco0 - runs a descriptor on DECO0, under direct control of
 93  *                        the software (no JR/QI used).
 94  * @ctrldev - pointer to device
 95  * @status - descriptor status, after being run
 96  *
 97  * Return: - 0 if no error occurred
 98  *         - -ENODEV if the DECO couldn't be acquired
 99  *         - -EAGAIN if an error occurred while executing the descriptor
100  */
101 static inline int run_descriptor_deco0(struct device *ctrldev, u32 *desc,
102                                         u32 *status)
103 {
104         struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
105         struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl;
106         struct caam_deco __iomem *deco = ctrlpriv->deco;
107         unsigned int timeout = 100000;
108         u32 deco_dbg_reg, flags;
109         int i;
110 
111 
112         if (ctrlpriv->virt_en == 1) {
113                 clrsetbits_32(&ctrl->deco_rsr, 0, DECORSR_JR0);
114 
115                 while (!(rd_reg32(&ctrl->deco_rsr) & DECORSR_VALID) &&
116                        --timeout)
117                         cpu_relax();
118 
119                 timeout = 100000;
120         }
121 
122         clrsetbits_32(&ctrl->deco_rq, 0, DECORR_RQD0ENABLE);
123 
124         while (!(rd_reg32(&ctrl->deco_rq) & DECORR_DEN0) &&
125                                                                  --timeout)
126                 cpu_relax();
127 
128         if (!timeout) {
129                 dev_err(ctrldev, "failed to acquire DECO 0\n");
130                 clrsetbits_32(&ctrl->deco_rq, DECORR_RQD0ENABLE, 0);
131                 return -ENODEV;
132         }
133 
134         for (i = 0; i < desc_len(desc); i++)
135                 wr_reg32(&deco->descbuf[i], caam32_to_cpu(*(desc + i)));
136 
137         flags = DECO_JQCR_WHL;
138         /*
139          * If the descriptor length is longer than 4 words, then the
140          * FOUR bit in JRCTRL register must be set.
141          */
142         if (desc_len(desc) >= 4)
143                 flags |= DECO_JQCR_FOUR;
144 
145         /* Instruct the DECO to execute it */
146         clrsetbits_32(&deco->jr_ctl_hi, 0, flags);
147 
148         timeout = 10000000;
149         do {
150                 deco_dbg_reg = rd_reg32(&deco->desc_dbg);
151                 /*
152                  * If an error occured in the descriptor, then
153                  * the DECO status field will be set to 0x0D
154                  */
155                 if ((deco_dbg_reg & DESC_DBG_DECO_STAT_MASK) ==
156                     DESC_DBG_DECO_STAT_HOST_ERR)
157                         break;
158                 cpu_relax();
159         } while ((deco_dbg_reg & DESC_DBG_DECO_STAT_VALID) && --timeout);
160 
161         *status = rd_reg32(&deco->op_status_hi) &
162                   DECO_OP_STATUS_HI_ERR_MASK;
163 
164         if (ctrlpriv->virt_en == 1)
165                 clrsetbits_32(&ctrl->deco_rsr, DECORSR_JR0, 0);
166 
167         /* Mark the DECO as free */
168         clrsetbits_32(&ctrl->deco_rq, DECORR_RQD0ENABLE, 0);
169 
170         if (!timeout)
171                 return -EAGAIN;
172 
173         return 0;
174 }
175 
176 /*
177  * instantiate_rng - builds and executes a descriptor on DECO0,
178  *                   which initializes the RNG block.
179  * @ctrldev - pointer to device
180  * @state_handle_mask - bitmask containing the instantiation status
181  *                      for the RNG4 state handles which exist in
182  *                      the RNG4 block: 1 if it's been instantiated
183  *                      by an external entry, 0 otherwise.
184  * @gen_sk  - generate data to be loaded into the JDKEK, TDKEK and TDSK;
185  *            Caution: this can be done only once; if the keys need to be
186  *            regenerated, a POR is required
187  *
188  * Return: - 0 if no error occurred
189  *         - -ENOMEM if there isn't enough memory to allocate the descriptor
190  *         - -ENODEV if DECO0 couldn't be acquired
191  *         - -EAGAIN if an error occurred when executing the descriptor
192  *            f.i. there was a RNG hardware error due to not "good enough"
193  *            entropy being aquired.
194  */
195 static int instantiate_rng(struct device *ctrldev, int state_handle_mask,
196                            int gen_sk)
197 {
198         struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
199         struct caam_ctrl __iomem *ctrl;
200         u32 *desc, status = 0, rdsta_val;
201         int ret = 0, sh_idx;
202 
203         ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
204         desc = kmalloc(CAAM_CMD_SZ * 7, GFP_KERNEL);
205         if (!desc)
206                 return -ENOMEM;
207 
208         for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) {
209                 /*
210                  * If the corresponding bit is set, this state handle
211                  * was initialized by somebody else, so it's left alone.
212                  */
213                 if ((1 << sh_idx) & state_handle_mask)
214                         continue;
215 
216                 /* Create the descriptor for instantiating RNG State Handle */
217                 build_instantiation_desc(desc, sh_idx, gen_sk);
218 
219                 /* Try to run it through DECO0 */
220                 ret = run_descriptor_deco0(ctrldev, desc, &status);
221 
222                 /*
223                  * If ret is not 0, or descriptor status is not 0, then
224                  * something went wrong. No need to try the next state
225                  * handle (if available), bail out here.
226                  * Also, if for some reason, the State Handle didn't get
227                  * instantiated although the descriptor has finished
228                  * without any error (HW optimizations for later
229                  * CAAM eras), then try again.
230                  */
231                 rdsta_val = rd_reg32(&ctrl->r4tst[0].rdsta) & RDSTA_IFMASK;
232                 if ((status && status != JRSTA_SSRC_JUMP_HALT_CC) ||
233                     !(rdsta_val & (1 << sh_idx)))
234                         ret = -EAGAIN;
235                 if (ret)
236                         break;
237                 dev_info(ctrldev, "Instantiated RNG4 SH%d\n", sh_idx);
238                 /* Clear the contents before recreating the descriptor */
239                 memset(desc, 0x00, CAAM_CMD_SZ * 7);
240         }
241 
242         kfree(desc);
243 
244         return ret;
245 }
246 
247 /*
248  * deinstantiate_rng - builds and executes a descriptor on DECO0,
249  *                     which deinitializes the RNG block.
250  * @ctrldev - pointer to device
251  * @state_handle_mask - bitmask containing the instantiation status
252  *                      for the RNG4 state handles which exist in
253  *                      the RNG4 block: 1 if it's been instantiated
254  *
255  * Return: - 0 if no error occurred
256  *         - -ENOMEM if there isn't enough memory to allocate the descriptor
257  *         - -ENODEV if DECO0 couldn't be acquired
258  *         - -EAGAIN if an error occurred when executing the descriptor
259  */
260 static int deinstantiate_rng(struct device *ctrldev, int state_handle_mask)
261 {
262         u32 *desc, status;
263         int sh_idx, ret = 0;
264 
265         desc = kmalloc(CAAM_CMD_SZ * 3, GFP_KERNEL);
266         if (!desc)
267                 return -ENOMEM;
268 
269         for (sh_idx = 0; sh_idx < RNG4_MAX_HANDLES; sh_idx++) {
270                 /*
271                  * If the corresponding bit is set, then it means the state
272                  * handle was initialized by us, and thus it needs to be
273                  * deintialized as well
274                  */
275                 if ((1 << sh_idx) & state_handle_mask) {
276                         /*
277                          * Create the descriptor for deinstantating this state
278                          * handle
279                          */
280                         build_deinstantiation_desc(desc, sh_idx);
281 
282                         /* Try to run it through DECO0 */
283                         ret = run_descriptor_deco0(ctrldev, desc, &status);
284 
285                         if (ret || status) {
286                                 dev_err(ctrldev,
287                                         "Failed to deinstantiate RNG4 SH%d\n",
288                                         sh_idx);
289                                 break;
290                         }
291                         dev_info(ctrldev, "Deinstantiated RNG4 SH%d\n", sh_idx);
292                 }
293         }
294 
295         kfree(desc);
296 
297         return ret;
298 }
299 
300 static int caam_remove(struct platform_device *pdev)
301 {
302         struct device *ctrldev;
303         struct caam_drv_private *ctrlpriv;
304         struct caam_ctrl __iomem *ctrl;
305         int ring;
306 
307         ctrldev = &pdev->dev;
308         ctrlpriv = dev_get_drvdata(ctrldev);
309         ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
310 
311         /* Remove platform devices for JobRs */
312         for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {
313                 if (ctrlpriv->jrpdev[ring])
314                         of_device_unregister(ctrlpriv->jrpdev[ring]);
315         }
316 
317         /* De-initialize RNG state handles initialized by this driver. */
318         if (ctrlpriv->rng4_sh_init)
319                 deinstantiate_rng(ctrldev, ctrlpriv->rng4_sh_init);
320 
321         /* Shut down debug views */
322 #ifdef CONFIG_DEBUG_FS
323         debugfs_remove_recursive(ctrlpriv->dfs_root);
324 #endif
325 
326         /* Unmap controller region */
327         iounmap(ctrl);
328 
329         /* shut clocks off before finalizing shutdown */
330         clk_disable_unprepare(ctrlpriv->caam_ipg);
331         clk_disable_unprepare(ctrlpriv->caam_mem);
332         clk_disable_unprepare(ctrlpriv->caam_aclk);
333         if (ctrlpriv->caam_emi_slow)
334                 clk_disable_unprepare(ctrlpriv->caam_emi_slow);
335         return 0;
336 }
337 
338 /*
339  * kick_trng - sets the various parameters for enabling the initialization
340  *             of the RNG4 block in CAAM
341  * @pdev - pointer to the platform device
342  * @ent_delay - Defines the length (in system clocks) of each entropy sample.
343  */
344 static void kick_trng(struct platform_device *pdev, int ent_delay)
345 {
346         struct device *ctrldev = &pdev->dev;
347         struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
348         struct caam_ctrl __iomem *ctrl;
349         struct rng4tst __iomem *r4tst;
350         u32 val;
351 
352         ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
353         r4tst = &ctrl->r4tst[0];
354 
355         /* put RNG4 into program mode */
356         clrsetbits_32(&r4tst->rtmctl, 0, RTMCTL_PRGM);
357 
358         /*
359          * Performance-wise, it does not make sense to
360          * set the delay to a value that is lower
361          * than the last one that worked (i.e. the state handles
362          * were instantiated properly. Thus, instead of wasting
363          * time trying to set the values controlling the sample
364          * frequency, the function simply returns.
365          */
366         val = (rd_reg32(&r4tst->rtsdctl) & RTSDCTL_ENT_DLY_MASK)
367               >> RTSDCTL_ENT_DLY_SHIFT;
368         if (ent_delay <= val)
369                 goto start_rng;
370 
371         val = rd_reg32(&r4tst->rtsdctl);
372         val = (val & ~RTSDCTL_ENT_DLY_MASK) |
373               (ent_delay << RTSDCTL_ENT_DLY_SHIFT);
374         wr_reg32(&r4tst->rtsdctl, val);
375         /* min. freq. count, equal to 1/4 of the entropy sample length */
376         wr_reg32(&r4tst->rtfrqmin, ent_delay >> 2);
377         /* disable maximum frequency count */
378         wr_reg32(&r4tst->rtfrqmax, RTFRQMAX_DISABLE);
379         /* read the control register */
380         val = rd_reg32(&r4tst->rtmctl);
381 start_rng:
382         /*
383          * select raw sampling in both entropy shifter
384          * and statistical checker; ; put RNG4 into run mode
385          */
386         clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM, RTMCTL_SAMP_MODE_RAW_ES_SC);
387 }
388 
389 /**
390  * caam_get_era() - Return the ERA of the SEC on SoC, based
391  * on "sec-era" propery in the DTS. This property is updated by u-boot.
392  **/
393 int caam_get_era(void)
394 {
395         struct device_node *caam_node;
396         int ret;
397         u32 prop;
398 
399         caam_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0");
400         ret = of_property_read_u32(caam_node, "fsl,sec-era", &prop);
401         of_node_put(caam_node);
402 
403         return ret ? -ENOTSUPP : prop;
404 }
405 EXPORT_SYMBOL(caam_get_era);
406 
407 #ifdef CONFIG_DEBUG_FS
408 static int caam_debugfs_u64_get(void *data, u64 *val)
409 {
410         *val = caam64_to_cpu(*(u64 *)data);
411         return 0;
412 }
413 
414 static int caam_debugfs_u32_get(void *data, u64 *val)
415 {
416         *val = caam32_to_cpu(*(u32 *)data);
417         return 0;
418 }
419 
420 DEFINE_SIMPLE_ATTRIBUTE(caam_fops_u32_ro, caam_debugfs_u32_get, NULL, "%llu\n");
421 DEFINE_SIMPLE_ATTRIBUTE(caam_fops_u64_ro, caam_debugfs_u64_get, NULL, "%llu\n");
422 #endif
423 
424 /* Probe routine for CAAM top (controller) level */
425 static int caam_probe(struct platform_device *pdev)
426 {
427         int ret, ring, rspec, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN;
428         u64 caam_id;
429         struct device *dev;
430         struct device_node *nprop, *np;
431         struct caam_ctrl __iomem *ctrl;
432         struct caam_drv_private *ctrlpriv;
433         struct clk *clk;
434 #ifdef CONFIG_DEBUG_FS
435         struct caam_perfmon *perfmon;
436 #endif
437         u32 scfgr, comp_params;
438         u32 cha_vid_ls;
439         int pg_size;
440         int BLOCK_OFFSET = 0;
441 
442         ctrlpriv = devm_kzalloc(&pdev->dev, sizeof(*ctrlpriv), GFP_KERNEL);
443         if (!ctrlpriv)
444                 return -ENOMEM;
445 
446         dev = &pdev->dev;
447         dev_set_drvdata(dev, ctrlpriv);
448         ctrlpriv->pdev = pdev;
449         nprop = pdev->dev.of_node;
450 
451         /* Enable clocking */
452         clk = caam_drv_identify_clk(&pdev->dev, "ipg");
453         if (IS_ERR(clk)) {
454                 ret = PTR_ERR(clk);
455                 dev_err(&pdev->dev,
456                         "can't identify CAAM ipg clk: %d\n", ret);
457                 return ret;
458         }
459         ctrlpriv->caam_ipg = clk;
460 
461         clk = caam_drv_identify_clk(&pdev->dev, "mem");
462         if (IS_ERR(clk)) {
463                 ret = PTR_ERR(clk);
464                 dev_err(&pdev->dev,
465                         "can't identify CAAM mem clk: %d\n", ret);
466                 return ret;
467         }
468         ctrlpriv->caam_mem = clk;
469 
470         clk = caam_drv_identify_clk(&pdev->dev, "aclk");
471         if (IS_ERR(clk)) {
472                 ret = PTR_ERR(clk);
473                 dev_err(&pdev->dev,
474                         "can't identify CAAM aclk clk: %d\n", ret);
475                 return ret;
476         }
477         ctrlpriv->caam_aclk = clk;
478 
479         if (!of_machine_is_compatible("fsl,imx6ul")) {
480                 clk = caam_drv_identify_clk(&pdev->dev, "emi_slow");
481                 if (IS_ERR(clk)) {
482                         ret = PTR_ERR(clk);
483                         dev_err(&pdev->dev,
484                                 "can't identify CAAM emi_slow clk: %d\n", ret);
485                         return ret;
486                 }
487                 ctrlpriv->caam_emi_slow = clk;
488         }
489 
490         ret = clk_prepare_enable(ctrlpriv->caam_ipg);
491         if (ret < 0) {
492                 dev_err(&pdev->dev, "can't enable CAAM ipg clock: %d\n", ret);
493                 return ret;
494         }
495 
496         ret = clk_prepare_enable(ctrlpriv->caam_mem);
497         if (ret < 0) {
498                 dev_err(&pdev->dev, "can't enable CAAM secure mem clock: %d\n",
499                         ret);
500                 goto disable_caam_ipg;
501         }
502 
503         ret = clk_prepare_enable(ctrlpriv->caam_aclk);
504         if (ret < 0) {
505                 dev_err(&pdev->dev, "can't enable CAAM aclk clock: %d\n", ret);
506                 goto disable_caam_mem;
507         }
508 
509         if (ctrlpriv->caam_emi_slow) {
510                 ret = clk_prepare_enable(ctrlpriv->caam_emi_slow);
511                 if (ret < 0) {
512                         dev_err(&pdev->dev, "can't enable CAAM emi slow clock: %d\n",
513                                 ret);
514                         goto disable_caam_aclk;
515                 }
516         }
517 
518         /* Get configuration properties from device tree */
519         /* First, get register page */
520         ctrl = of_iomap(nprop, 0);
521         if (ctrl == NULL) {
522                 dev_err(dev, "caam: of_iomap() failed\n");
523                 ret = -ENOMEM;
524                 goto disable_caam_emi_slow;
525         }
526 
527         caam_little_end = !(bool)(rd_reg32(&ctrl->perfmon.status) &
528                                   (CSTA_PLEND | CSTA_ALT_PLEND));
529 
530         /* Finding the page size for using the CTPR_MS register */
531         comp_params = rd_reg32(&ctrl->perfmon.comp_parms_ms);
532         pg_size = (comp_params & CTPR_MS_PG_SZ_MASK) >> CTPR_MS_PG_SZ_SHIFT;
533 
534         /* Allocating the BLOCK_OFFSET based on the supported page size on
535          * the platform
536          */
537         if (pg_size == 0)
538                 BLOCK_OFFSET = PG_SIZE_4K;
539         else
540                 BLOCK_OFFSET = PG_SIZE_64K;
541 
542         ctrlpriv->ctrl = (struct caam_ctrl __iomem __force *)ctrl;
543         ctrlpriv->assure = (struct caam_assurance __iomem __force *)
544                            ((__force uint8_t *)ctrl +
545                             BLOCK_OFFSET * ASSURE_BLOCK_NUMBER
546                            );
547         ctrlpriv->deco = (struct caam_deco __iomem __force *)
548                          ((__force uint8_t *)ctrl +
549                          BLOCK_OFFSET * DECO_BLOCK_NUMBER
550                          );
551 
552         /* Get the IRQ of the controller (for security violations only) */
553         ctrlpriv->secvio_irq = irq_of_parse_and_map(nprop, 0);
554 
555         /*
556          * Enable DECO watchdogs and, if this is a PHYS_ADDR_T_64BIT kernel,
557          * long pointers in master configuration register
558          */
559         clrsetbits_32(&ctrl->mcr, MCFGR_AWCACHE_MASK | MCFGR_LONG_PTR,
560                       MCFGR_AWCACHE_CACH | MCFGR_AWCACHE_BUFF |
561                       MCFGR_WDENABLE | MCFGR_LARGE_BURST |
562                       (sizeof(dma_addr_t) == sizeof(u64) ? MCFGR_LONG_PTR : 0));
563 
564         /*
565          *  Read the Compile Time paramters and SCFGR to determine
566          * if Virtualization is enabled for this platform
567          */
568         scfgr = rd_reg32(&ctrl->scfgr);
569 
570         ctrlpriv->virt_en = 0;
571         if (comp_params & CTPR_MS_VIRT_EN_INCL) {
572                 /* VIRT_EN_INCL = 1 & VIRT_EN_POR = 1 or
573                  * VIRT_EN_INCL = 1 & VIRT_EN_POR = 0 & SCFGR_VIRT_EN = 1
574                  */
575                 if ((comp_params & CTPR_MS_VIRT_EN_POR) ||
576                     (!(comp_params & CTPR_MS_VIRT_EN_POR) &&
577                        (scfgr & SCFGR_VIRT_EN)))
578                                 ctrlpriv->virt_en = 1;
579         } else {
580                 /* VIRT_EN_INCL = 0 && VIRT_EN_POR_VALUE = 1 */
581                 if (comp_params & CTPR_MS_VIRT_EN_POR)
582                                 ctrlpriv->virt_en = 1;
583         }
584 
585         if (ctrlpriv->virt_en == 1)
586                 clrsetbits_32(&ctrl->jrstart, 0, JRSTART_JR0_START |
587                               JRSTART_JR1_START | JRSTART_JR2_START |
588                               JRSTART_JR3_START);
589 
590         if (sizeof(dma_addr_t) == sizeof(u64))
591                 if (of_device_is_compatible(nprop, "fsl,sec-v5.0"))
592                         dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
593                 else
594                         dma_set_mask_and_coherent(dev, DMA_BIT_MASK(36));
595         else
596                 dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
597 
598         /*
599          * Detect and enable JobRs
600          * First, find out how many ring spec'ed, allocate references
601          * for all, then go probe each one.
602          */
603         rspec = 0;
604         for_each_available_child_of_node(nprop, np)
605                 if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring") ||
606                     of_device_is_compatible(np, "fsl,sec4.0-job-ring"))
607                         rspec++;
608 
609         ctrlpriv->jrpdev = devm_kcalloc(&pdev->dev, rspec,
610                                         sizeof(*ctrlpriv->jrpdev), GFP_KERNEL);
611         if (ctrlpriv->jrpdev == NULL) {
612                 ret = -ENOMEM;
613                 goto iounmap_ctrl;
614         }
615 
616         ring = 0;
617         ctrlpriv->total_jobrs = 0;
618         for_each_available_child_of_node(nprop, np)
619                 if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring") ||
620                     of_device_is_compatible(np, "fsl,sec4.0-job-ring")) {
621                         ctrlpriv->jrpdev[ring] =
622                                 of_platform_device_create(np, NULL, dev);
623                         if (!ctrlpriv->jrpdev[ring]) {
624                                 pr_warn("JR%d Platform device creation error\n",
625                                         ring);
626                                 continue;
627                         }
628                         ctrlpriv->jr[ring] = (struct caam_job_ring __iomem __force *)
629                                              ((__force uint8_t *)ctrl +
630                                              (ring + JR_BLOCK_NUMBER) *
631                                               BLOCK_OFFSET
632                                              );
633                         ctrlpriv->total_jobrs++;
634                         ring++;
635         }
636 
637         /* Check to see if QI present. If so, enable */
638         ctrlpriv->qi_present =
639                         !!(rd_reg32(&ctrl->perfmon.comp_parms_ms) &
640                            CTPR_MS_QI_MASK);
641         if (ctrlpriv->qi_present) {
642                 ctrlpriv->qi = (struct caam_queue_if __iomem __force *)
643                                ((__force uint8_t *)ctrl +
644                                  BLOCK_OFFSET * QI_BLOCK_NUMBER
645                                );
646                 /* This is all that's required to physically enable QI */
647                 wr_reg32(&ctrlpriv->qi->qi_control_lo, QICTL_DQEN);
648         }
649 
650         /* If no QI and no rings specified, quit and go home */
651         if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) {
652                 dev_err(dev, "no queues configured, terminating\n");
653                 ret = -ENOMEM;
654                 goto caam_remove;
655         }
656 
657         cha_vid_ls = rd_reg32(&ctrl->perfmon.cha_id_ls);
658 
659         /*
660          * If SEC has RNG version >= 4 and RNG state handle has not been
661          * already instantiated, do RNG instantiation
662          */
663         if ((cha_vid_ls & CHA_ID_LS_RNG_MASK) >> CHA_ID_LS_RNG_SHIFT >= 4) {
664                 ctrlpriv->rng4_sh_init =
665                         rd_reg32(&ctrl->r4tst[0].rdsta);
666                 /*
667                  * If the secure keys (TDKEK, JDKEK, TDSK), were already
668                  * generated, signal this to the function that is instantiating
669                  * the state handles. An error would occur if RNG4 attempts
670                  * to regenerate these keys before the next POR.
671                  */
672                 gen_sk = ctrlpriv->rng4_sh_init & RDSTA_SKVN ? 0 : 1;
673                 ctrlpriv->rng4_sh_init &= RDSTA_IFMASK;
674                 do {
675                         int inst_handles =
676                                 rd_reg32(&ctrl->r4tst[0].rdsta) &
677                                                                 RDSTA_IFMASK;
678                         /*
679                          * If either SH were instantiated by somebody else
680                          * (e.g. u-boot) then it is assumed that the entropy
681                          * parameters are properly set and thus the function
682                          * setting these (kick_trng(...)) is skipped.
683                          * Also, if a handle was instantiated, do not change
684                          * the TRNG parameters.
685                          */
686                         if (!(ctrlpriv->rng4_sh_init || inst_handles)) {
687                                 dev_info(dev,
688                                          "Entropy delay = %u\n",
689                                          ent_delay);
690                                 kick_trng(pdev, ent_delay);
691                                 ent_delay += 400;
692                         }
693                         /*
694                          * if instantiate_rng(...) fails, the loop will rerun
695                          * and the kick_trng(...) function will modfiy the
696                          * upper and lower limits of the entropy sampling
697                          * interval, leading to a sucessful initialization of
698                          * the RNG.
699                          */
700                         ret = instantiate_rng(dev, inst_handles,
701                                               gen_sk);
702                         if (ret == -EAGAIN)
703                                 /*
704                                  * if here, the loop will rerun,
705                                  * so don't hog the CPU
706                                  */
707                                 cpu_relax();
708                 } while ((ret == -EAGAIN) && (ent_delay < RTSDCTL_ENT_DLY_MAX));
709                 if (ret) {
710                         dev_err(dev, "failed to instantiate RNG");
711                         goto caam_remove;
712                 }
713                 /*
714                  * Set handles init'ed by this module as the complement of the
715                  * already initialized ones
716                  */
717                 ctrlpriv->rng4_sh_init = ~ctrlpriv->rng4_sh_init & RDSTA_IFMASK;
718 
719                 /* Enable RDB bit so that RNG works faster */
720                 clrsetbits_32(&ctrl->scfgr, 0, SCFGR_RDBENABLE);
721         }
722 
723         /* NOTE: RTIC detection ought to go here, around Si time */
724 
725         caam_id = (u64)rd_reg32(&ctrl->perfmon.caam_id_ms) << 32 |
726                   (u64)rd_reg32(&ctrl->perfmon.caam_id_ls);
727 
728         /* Report "alive" for developer to see */
729         dev_info(dev, "device ID = 0x%016llx (Era %d)\n", caam_id,
730                  caam_get_era());
731         dev_info(dev, "job rings = %d, qi = %d\n",
732                  ctrlpriv->total_jobrs, ctrlpriv->qi_present);
733 
734 #ifdef CONFIG_DEBUG_FS
735         /*
736          * FIXME: needs better naming distinction, as some amalgamation of
737          * "caam" and nprop->full_name. The OF name isn't distinctive,
738          * but does separate instances
739          */
740         perfmon = (struct caam_perfmon __force *)&ctrl->perfmon;
741 
742         ctrlpriv->dfs_root = debugfs_create_dir(dev_name(dev), NULL);
743         ctrlpriv->ctl = debugfs_create_dir("ctl", ctrlpriv->dfs_root);
744 
745         /* Controller-level - performance monitor counters */
746 
747         ctrlpriv->ctl_rq_dequeued =
748                 debugfs_create_file("rq_dequeued",
749                                     S_IRUSR | S_IRGRP | S_IROTH,
750                                     ctrlpriv->ctl, &perfmon->req_dequeued,
751                                     &caam_fops_u64_ro);
752         ctrlpriv->ctl_ob_enc_req =
753                 debugfs_create_file("ob_rq_encrypted",
754                                     S_IRUSR | S_IRGRP | S_IROTH,
755                                     ctrlpriv->ctl, &perfmon->ob_enc_req,
756                                     &caam_fops_u64_ro);
757         ctrlpriv->ctl_ib_dec_req =
758                 debugfs_create_file("ib_rq_decrypted",
759                                     S_IRUSR | S_IRGRP | S_IROTH,
760                                     ctrlpriv->ctl, &perfmon->ib_dec_req,
761                                     &caam_fops_u64_ro);
762         ctrlpriv->ctl_ob_enc_bytes =
763                 debugfs_create_file("ob_bytes_encrypted",
764                                     S_IRUSR | S_IRGRP | S_IROTH,
765                                     ctrlpriv->ctl, &perfmon->ob_enc_bytes,
766                                     &caam_fops_u64_ro);
767         ctrlpriv->ctl_ob_prot_bytes =
768                 debugfs_create_file("ob_bytes_protected",
769                                     S_IRUSR | S_IRGRP | S_IROTH,
770                                     ctrlpriv->ctl, &perfmon->ob_prot_bytes,
771                                     &caam_fops_u64_ro);
772         ctrlpriv->ctl_ib_dec_bytes =
773                 debugfs_create_file("ib_bytes_decrypted",
774                                     S_IRUSR | S_IRGRP | S_IROTH,
775                                     ctrlpriv->ctl, &perfmon->ib_dec_bytes,
776                                     &caam_fops_u64_ro);
777         ctrlpriv->ctl_ib_valid_bytes =
778                 debugfs_create_file("ib_bytes_validated",
779                                     S_IRUSR | S_IRGRP | S_IROTH,
780                                     ctrlpriv->ctl, &perfmon->ib_valid_bytes,
781                                     &caam_fops_u64_ro);
782 
783         /* Controller level - global status values */
784         ctrlpriv->ctl_faultaddr =
785                 debugfs_create_file("fault_addr",
786                                     S_IRUSR | S_IRGRP | S_IROTH,
787                                     ctrlpriv->ctl, &perfmon->faultaddr,
788                                     &caam_fops_u32_ro);
789         ctrlpriv->ctl_faultdetail =
790                 debugfs_create_file("fault_detail",
791                                     S_IRUSR | S_IRGRP | S_IROTH,
792                                     ctrlpriv->ctl, &perfmon->faultdetail,
793                                     &caam_fops_u32_ro);
794         ctrlpriv->ctl_faultstatus =
795                 debugfs_create_file("fault_status",
796                                     S_IRUSR | S_IRGRP | S_IROTH,
797                                     ctrlpriv->ctl, &perfmon->status,
798                                     &caam_fops_u32_ro);
799 
800         /* Internal covering keys (useful in non-secure mode only) */
801         ctrlpriv->ctl_kek_wrap.data = (__force void *)&ctrlpriv->ctrl->kek[0];
802         ctrlpriv->ctl_kek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
803         ctrlpriv->ctl_kek = debugfs_create_blob("kek",
804                                                 S_IRUSR |
805                                                 S_IRGRP | S_IROTH,
806                                                 ctrlpriv->ctl,
807                                                 &ctrlpriv->ctl_kek_wrap);
808 
809         ctrlpriv->ctl_tkek_wrap.data = (__force void *)&ctrlpriv->ctrl->tkek[0];
810         ctrlpriv->ctl_tkek_wrap.size = KEK_KEY_SIZE * sizeof(u32);
811         ctrlpriv->ctl_tkek = debugfs_create_blob("tkek",
812                                                  S_IRUSR |
813                                                  S_IRGRP | S_IROTH,
814                                                  ctrlpriv->ctl,
815                                                  &ctrlpriv->ctl_tkek_wrap);
816 
817         ctrlpriv->ctl_tdsk_wrap.data = (__force void *)&ctrlpriv->ctrl->tdsk[0];
818         ctrlpriv->ctl_tdsk_wrap.size = KEK_KEY_SIZE * sizeof(u32);
819         ctrlpriv->ctl_tdsk = debugfs_create_blob("tdsk",
820                                                  S_IRUSR |
821                                                  S_IRGRP | S_IROTH,
822                                                  ctrlpriv->ctl,
823                                                  &ctrlpriv->ctl_tdsk_wrap);
824 #endif
825         return 0;
826 
827 caam_remove:
828         caam_remove(pdev);
829         return ret;
830 
831 iounmap_ctrl:
832         iounmap(ctrl);
833 disable_caam_emi_slow:
834         if (ctrlpriv->caam_emi_slow)
835                 clk_disable_unprepare(ctrlpriv->caam_emi_slow);
836 disable_caam_aclk:
837         clk_disable_unprepare(ctrlpriv->caam_aclk);
838 disable_caam_mem:
839         clk_disable_unprepare(ctrlpriv->caam_mem);
840 disable_caam_ipg:
841         clk_disable_unprepare(ctrlpriv->caam_ipg);
842         return ret;
843 }
844 
845 static struct of_device_id caam_match[] = {
846         {
847                 .compatible = "fsl,sec-v4.0",
848         },
849         {
850                 .compatible = "fsl,sec4.0",
851         },
852         {},
853 };
854 MODULE_DEVICE_TABLE(of, caam_match);
855 
856 static struct platform_driver caam_driver = {
857         .driver = {
858                 .name = "caam",
859                 .of_match_table = caam_match,
860         },
861         .probe       = caam_probe,
862         .remove      = caam_remove,
863 };
864 
865 module_platform_driver(caam_driver);
866 
867 MODULE_LICENSE("GPL");
868 MODULE_DESCRIPTION("FSL CAAM request backend");
869 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");
870 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us