Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/crypto/amcc/crypto4xx_core.c

  1 /**
  2  * AMCC SoC PPC4xx Crypto Driver
  3  *
  4  * Copyright (c) 2008 Applied Micro Circuits Corporation.
  5  * All rights reserved. James Hsiao <jhsiao@amcc.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * This file implements AMCC crypto offload Linux device driver for use with
 18  * Linux CryptoAPI.
 19  */
 20 
 21 #include <linux/kernel.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/spinlock_types.h>
 24 #include <linux/random.h>
 25 #include <linux/scatterlist.h>
 26 #include <linux/crypto.h>
 27 #include <linux/dma-mapping.h>
 28 #include <linux/platform_device.h>
 29 #include <linux/init.h>
 30 #include <linux/module.h>
 31 #include <linux/of_address.h>
 32 #include <linux/of_irq.h>
 33 #include <linux/of_platform.h>
 34 #include <linux/slab.h>
 35 #include <asm/dcr.h>
 36 #include <asm/dcr-regs.h>
 37 #include <asm/cacheflush.h>
 38 #include <crypto/aes.h>
 39 #include <crypto/sha.h>
 40 #include "crypto4xx_reg_def.h"
 41 #include "crypto4xx_core.h"
 42 #include "crypto4xx_sa.h"
 43 
 44 #define PPC4XX_SEC_VERSION_STR                  "0.5"
 45 
 46 /**
 47  * PPC4xx Crypto Engine Initialization Routine
 48  */
 49 static void crypto4xx_hw_init(struct crypto4xx_device *dev)
 50 {
 51         union ce_ring_size ring_size;
 52         union ce_ring_contol ring_ctrl;
 53         union ce_part_ring_size part_ring_size;
 54         union ce_io_threshold io_threshold;
 55         u32 rand_num;
 56         union ce_pe_dma_cfg pe_dma_cfg;
 57         u32 device_ctrl;
 58 
 59         writel(PPC4XX_BYTE_ORDER, dev->ce_base + CRYPTO4XX_BYTE_ORDER_CFG);
 60         /* setup pe dma, include reset sg, pdr and pe, then release reset */
 61         pe_dma_cfg.w = 0;
 62         pe_dma_cfg.bf.bo_sgpd_en = 1;
 63         pe_dma_cfg.bf.bo_data_en = 0;
 64         pe_dma_cfg.bf.bo_sa_en = 1;
 65         pe_dma_cfg.bf.bo_pd_en = 1;
 66         pe_dma_cfg.bf.dynamic_sa_en = 1;
 67         pe_dma_cfg.bf.reset_sg = 1;
 68         pe_dma_cfg.bf.reset_pdr = 1;
 69         pe_dma_cfg.bf.reset_pe = 1;
 70         writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
 71         /* un reset pe,sg and pdr */
 72         pe_dma_cfg.bf.pe_mode = 0;
 73         pe_dma_cfg.bf.reset_sg = 0;
 74         pe_dma_cfg.bf.reset_pdr = 0;
 75         pe_dma_cfg.bf.reset_pe = 0;
 76         pe_dma_cfg.bf.bo_td_en = 0;
 77         writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
 78         writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_PDR_BASE);
 79         writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_RDR_BASE);
 80         writel(PPC4XX_PRNG_CTRL_AUTO_EN, dev->ce_base + CRYPTO4XX_PRNG_CTRL);
 81         get_random_bytes(&rand_num, sizeof(rand_num));
 82         writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_L);
 83         get_random_bytes(&rand_num, sizeof(rand_num));
 84         writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_H);
 85         ring_size.w = 0;
 86         ring_size.bf.ring_offset = PPC4XX_PD_SIZE;
 87         ring_size.bf.ring_size   = PPC4XX_NUM_PD;
 88         writel(ring_size.w, dev->ce_base + CRYPTO4XX_RING_SIZE);
 89         ring_ctrl.w = 0;
 90         writel(ring_ctrl.w, dev->ce_base + CRYPTO4XX_RING_CTRL);
 91         device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
 92         device_ctrl |= PPC4XX_DC_3DES_EN;
 93         writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
 94         writel(dev->gdr_pa, dev->ce_base + CRYPTO4XX_GATH_RING_BASE);
 95         writel(dev->sdr_pa, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE);
 96         part_ring_size.w = 0;
 97         part_ring_size.bf.sdr_size = PPC4XX_SDR_SIZE;
 98         part_ring_size.bf.gdr_size = PPC4XX_GDR_SIZE;
 99         writel(part_ring_size.w, dev->ce_base + CRYPTO4XX_PART_RING_SIZE);
100         writel(PPC4XX_SD_BUFFER_SIZE, dev->ce_base + CRYPTO4XX_PART_RING_CFG);
101         io_threshold.w = 0;
102         io_threshold.bf.output_threshold = PPC4XX_OUTPUT_THRESHOLD;
103         io_threshold.bf.input_threshold  = PPC4XX_INPUT_THRESHOLD;
104         writel(io_threshold.w, dev->ce_base + CRYPTO4XX_IO_THRESHOLD);
105         writel(0, dev->ce_base + CRYPTO4XX_PDR_BASE_UADDR);
106         writel(0, dev->ce_base + CRYPTO4XX_RDR_BASE_UADDR);
107         writel(0, dev->ce_base + CRYPTO4XX_PKT_SRC_UADDR);
108         writel(0, dev->ce_base + CRYPTO4XX_PKT_DEST_UADDR);
109         writel(0, dev->ce_base + CRYPTO4XX_SA_UADDR);
110         writel(0, dev->ce_base + CRYPTO4XX_GATH_RING_BASE_UADDR);
111         writel(0, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE_UADDR);
112         /* un reset pe,sg and pdr */
113         pe_dma_cfg.bf.pe_mode = 1;
114         pe_dma_cfg.bf.reset_sg = 0;
115         pe_dma_cfg.bf.reset_pdr = 0;
116         pe_dma_cfg.bf.reset_pe = 0;
117         pe_dma_cfg.bf.bo_td_en = 0;
118         writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
119         /*clear all pending interrupt*/
120         writel(PPC4XX_INTERRUPT_CLR, dev->ce_base + CRYPTO4XX_INT_CLR);
121         writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT);
122         writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT);
123         writel(PPC4XX_INT_CFG, dev->ce_base + CRYPTO4XX_INT_CFG);
124         writel(PPC4XX_PD_DONE_INT, dev->ce_base + CRYPTO4XX_INT_EN);
125 }
126 
127 int crypto4xx_alloc_sa(struct crypto4xx_ctx *ctx, u32 size)
128 {
129         ctx->sa_in = dma_alloc_coherent(ctx->dev->core_dev->device, size * 4,
130                                         &ctx->sa_in_dma_addr, GFP_ATOMIC);
131         if (ctx->sa_in == NULL)
132                 return -ENOMEM;
133 
134         ctx->sa_out = dma_alloc_coherent(ctx->dev->core_dev->device, size * 4,
135                                          &ctx->sa_out_dma_addr, GFP_ATOMIC);
136         if (ctx->sa_out == NULL) {
137                 dma_free_coherent(ctx->dev->core_dev->device,
138                                   ctx->sa_len * 4,
139                                   ctx->sa_in, ctx->sa_in_dma_addr);
140                 return -ENOMEM;
141         }
142 
143         memset(ctx->sa_in, 0, size * 4);
144         memset(ctx->sa_out, 0, size * 4);
145         ctx->sa_len = size;
146 
147         return 0;
148 }
149 
150 void crypto4xx_free_sa(struct crypto4xx_ctx *ctx)
151 {
152         if (ctx->sa_in != NULL)
153                 dma_free_coherent(ctx->dev->core_dev->device, ctx->sa_len * 4,
154                                   ctx->sa_in, ctx->sa_in_dma_addr);
155         if (ctx->sa_out != NULL)
156                 dma_free_coherent(ctx->dev->core_dev->device, ctx->sa_len * 4,
157                                   ctx->sa_out, ctx->sa_out_dma_addr);
158 
159         ctx->sa_in_dma_addr = 0;
160         ctx->sa_out_dma_addr = 0;
161         ctx->sa_len = 0;
162 }
163 
164 u32 crypto4xx_alloc_state_record(struct crypto4xx_ctx *ctx)
165 {
166         ctx->state_record = dma_alloc_coherent(ctx->dev->core_dev->device,
167                                 sizeof(struct sa_state_record),
168                                 &ctx->state_record_dma_addr, GFP_ATOMIC);
169         if (!ctx->state_record_dma_addr)
170                 return -ENOMEM;
171         memset(ctx->state_record, 0, sizeof(struct sa_state_record));
172 
173         return 0;
174 }
175 
176 void crypto4xx_free_state_record(struct crypto4xx_ctx *ctx)
177 {
178         if (ctx->state_record != NULL)
179                 dma_free_coherent(ctx->dev->core_dev->device,
180                                   sizeof(struct sa_state_record),
181                                   ctx->state_record,
182                                   ctx->state_record_dma_addr);
183         ctx->state_record_dma_addr = 0;
184 }
185 
186 /**
187  * alloc memory for the gather ring
188  * no need to alloc buf for the ring
189  * gdr_tail, gdr_head and gdr_count are initialized by this function
190  */
191 static u32 crypto4xx_build_pdr(struct crypto4xx_device *dev)
192 {
193         int i;
194         struct pd_uinfo *pd_uinfo;
195         dev->pdr = dma_alloc_coherent(dev->core_dev->device,
196                                       sizeof(struct ce_pd) * PPC4XX_NUM_PD,
197                                       &dev->pdr_pa, GFP_ATOMIC);
198         if (!dev->pdr)
199                 return -ENOMEM;
200 
201         dev->pdr_uinfo = kzalloc(sizeof(struct pd_uinfo) * PPC4XX_NUM_PD,
202                                 GFP_KERNEL);
203         if (!dev->pdr_uinfo) {
204                 dma_free_coherent(dev->core_dev->device,
205                                   sizeof(struct ce_pd) * PPC4XX_NUM_PD,
206                                   dev->pdr,
207                                   dev->pdr_pa);
208                 return -ENOMEM;
209         }
210         memset(dev->pdr, 0,  sizeof(struct ce_pd) * PPC4XX_NUM_PD);
211         dev->shadow_sa_pool = dma_alloc_coherent(dev->core_dev->device,
212                                    256 * PPC4XX_NUM_PD,
213                                    &dev->shadow_sa_pool_pa,
214                                    GFP_ATOMIC);
215         if (!dev->shadow_sa_pool)
216                 return -ENOMEM;
217 
218         dev->shadow_sr_pool = dma_alloc_coherent(dev->core_dev->device,
219                          sizeof(struct sa_state_record) * PPC4XX_NUM_PD,
220                          &dev->shadow_sr_pool_pa, GFP_ATOMIC);
221         if (!dev->shadow_sr_pool)
222                 return -ENOMEM;
223         for (i = 0; i < PPC4XX_NUM_PD; i++) {
224                 pd_uinfo = (struct pd_uinfo *) (dev->pdr_uinfo +
225                                                 sizeof(struct pd_uinfo) * i);
226 
227                 /* alloc 256 bytes which is enough for any kind of dynamic sa */
228                 pd_uinfo->sa_va = dev->shadow_sa_pool + 256 * i;
229                 pd_uinfo->sa_pa = dev->shadow_sa_pool_pa + 256 * i;
230 
231                 /* alloc state record */
232                 pd_uinfo->sr_va = dev->shadow_sr_pool +
233                     sizeof(struct sa_state_record) * i;
234                 pd_uinfo->sr_pa = dev->shadow_sr_pool_pa +
235                     sizeof(struct sa_state_record) * i;
236         }
237 
238         return 0;
239 }
240 
241 static void crypto4xx_destroy_pdr(struct crypto4xx_device *dev)
242 {
243         if (dev->pdr != NULL)
244                 dma_free_coherent(dev->core_dev->device,
245                                   sizeof(struct ce_pd) * PPC4XX_NUM_PD,
246                                   dev->pdr, dev->pdr_pa);
247         if (dev->shadow_sa_pool)
248                 dma_free_coherent(dev->core_dev->device, 256 * PPC4XX_NUM_PD,
249                                   dev->shadow_sa_pool, dev->shadow_sa_pool_pa);
250         if (dev->shadow_sr_pool)
251                 dma_free_coherent(dev->core_dev->device,
252                         sizeof(struct sa_state_record) * PPC4XX_NUM_PD,
253                         dev->shadow_sr_pool, dev->shadow_sr_pool_pa);
254 
255         kfree(dev->pdr_uinfo);
256 }
257 
258 static u32 crypto4xx_get_pd_from_pdr_nolock(struct crypto4xx_device *dev)
259 {
260         u32 retval;
261         u32 tmp;
262 
263         retval = dev->pdr_head;
264         tmp = (dev->pdr_head + 1) % PPC4XX_NUM_PD;
265 
266         if (tmp == dev->pdr_tail)
267                 return ERING_WAS_FULL;
268 
269         dev->pdr_head = tmp;
270 
271         return retval;
272 }
273 
274 static u32 crypto4xx_put_pd_to_pdr(struct crypto4xx_device *dev, u32 idx)
275 {
276         struct pd_uinfo *pd_uinfo;
277         unsigned long flags;
278 
279         pd_uinfo = (struct pd_uinfo *)(dev->pdr_uinfo +
280                                        sizeof(struct pd_uinfo) * idx);
281         spin_lock_irqsave(&dev->core_dev->lock, flags);
282         if (dev->pdr_tail != PPC4XX_LAST_PD)
283                 dev->pdr_tail++;
284         else
285                 dev->pdr_tail = 0;
286         pd_uinfo->state = PD_ENTRY_FREE;
287         spin_unlock_irqrestore(&dev->core_dev->lock, flags);
288 
289         return 0;
290 }
291 
292 static struct ce_pd *crypto4xx_get_pdp(struct crypto4xx_device *dev,
293                                        dma_addr_t *pd_dma, u32 idx)
294 {
295         *pd_dma = dev->pdr_pa + sizeof(struct ce_pd) * idx;
296 
297         return dev->pdr + sizeof(struct ce_pd) * idx;
298 }
299 
300 /**
301  * alloc memory for the gather ring
302  * no need to alloc buf for the ring
303  * gdr_tail, gdr_head and gdr_count are initialized by this function
304  */
305 static u32 crypto4xx_build_gdr(struct crypto4xx_device *dev)
306 {
307         dev->gdr = dma_alloc_coherent(dev->core_dev->device,
308                                       sizeof(struct ce_gd) * PPC4XX_NUM_GD,
309                                       &dev->gdr_pa, GFP_ATOMIC);
310         if (!dev->gdr)
311                 return -ENOMEM;
312 
313         memset(dev->gdr, 0, sizeof(struct ce_gd) * PPC4XX_NUM_GD);
314 
315         return 0;
316 }
317 
318 static inline void crypto4xx_destroy_gdr(struct crypto4xx_device *dev)
319 {
320         dma_free_coherent(dev->core_dev->device,
321                           sizeof(struct ce_gd) * PPC4XX_NUM_GD,
322                           dev->gdr, dev->gdr_pa);
323 }
324 
325 /*
326  * when this function is called.
327  * preemption or interrupt must be disabled
328  */
329 u32 crypto4xx_get_n_gd(struct crypto4xx_device *dev, int n)
330 {
331         u32 retval;
332         u32 tmp;
333         if (n >= PPC4XX_NUM_GD)
334                 return ERING_WAS_FULL;
335 
336         retval = dev->gdr_head;
337         tmp = (dev->gdr_head + n) % PPC4XX_NUM_GD;
338         if (dev->gdr_head > dev->gdr_tail) {
339                 if (tmp < dev->gdr_head && tmp >= dev->gdr_tail)
340                         return ERING_WAS_FULL;
341         } else if (dev->gdr_head < dev->gdr_tail) {
342                 if (tmp < dev->gdr_head || tmp >= dev->gdr_tail)
343                         return ERING_WAS_FULL;
344         }
345         dev->gdr_head = tmp;
346 
347         return retval;
348 }
349 
350 static u32 crypto4xx_put_gd_to_gdr(struct crypto4xx_device *dev)
351 {
352         unsigned long flags;
353 
354         spin_lock_irqsave(&dev->core_dev->lock, flags);
355         if (dev->gdr_tail == dev->gdr_head) {
356                 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
357                 return 0;
358         }
359 
360         if (dev->gdr_tail != PPC4XX_LAST_GD)
361                 dev->gdr_tail++;
362         else
363                 dev->gdr_tail = 0;
364 
365         spin_unlock_irqrestore(&dev->core_dev->lock, flags);
366 
367         return 0;
368 }
369 
370 static inline struct ce_gd *crypto4xx_get_gdp(struct crypto4xx_device *dev,
371                                               dma_addr_t *gd_dma, u32 idx)
372 {
373         *gd_dma = dev->gdr_pa + sizeof(struct ce_gd) * idx;
374 
375         return (struct ce_gd *) (dev->gdr + sizeof(struct ce_gd) * idx);
376 }
377 
378 /**
379  * alloc memory for the scatter ring
380  * need to alloc buf for the ring
381  * sdr_tail, sdr_head and sdr_count are initialized by this function
382  */
383 static u32 crypto4xx_build_sdr(struct crypto4xx_device *dev)
384 {
385         int i;
386         struct ce_sd *sd_array;
387 
388         /* alloc memory for scatter descriptor ring */
389         dev->sdr = dma_alloc_coherent(dev->core_dev->device,
390                                       sizeof(struct ce_sd) * PPC4XX_NUM_SD,
391                                       &dev->sdr_pa, GFP_ATOMIC);
392         if (!dev->sdr)
393                 return -ENOMEM;
394 
395         dev->scatter_buffer_size = PPC4XX_SD_BUFFER_SIZE;
396         dev->scatter_buffer_va =
397                 dma_alloc_coherent(dev->core_dev->device,
398                         dev->scatter_buffer_size * PPC4XX_NUM_SD,
399                         &dev->scatter_buffer_pa, GFP_ATOMIC);
400         if (!dev->scatter_buffer_va) {
401                 dma_free_coherent(dev->core_dev->device,
402                                   sizeof(struct ce_sd) * PPC4XX_NUM_SD,
403                                   dev->sdr, dev->sdr_pa);
404                 return -ENOMEM;
405         }
406 
407         sd_array = dev->sdr;
408 
409         for (i = 0; i < PPC4XX_NUM_SD; i++) {
410                 sd_array[i].ptr = dev->scatter_buffer_pa +
411                                   dev->scatter_buffer_size * i;
412         }
413 
414         return 0;
415 }
416 
417 static void crypto4xx_destroy_sdr(struct crypto4xx_device *dev)
418 {
419         if (dev->sdr != NULL)
420                 dma_free_coherent(dev->core_dev->device,
421                                   sizeof(struct ce_sd) * PPC4XX_NUM_SD,
422                                   dev->sdr, dev->sdr_pa);
423 
424         if (dev->scatter_buffer_va != NULL)
425                 dma_free_coherent(dev->core_dev->device,
426                                   dev->scatter_buffer_size * PPC4XX_NUM_SD,
427                                   dev->scatter_buffer_va,
428                                   dev->scatter_buffer_pa);
429 }
430 
431 /*
432  * when this function is called.
433  * preemption or interrupt must be disabled
434  */
435 static u32 crypto4xx_get_n_sd(struct crypto4xx_device *dev, int n)
436 {
437         u32 retval;
438         u32 tmp;
439 
440         if (n >= PPC4XX_NUM_SD)
441                 return ERING_WAS_FULL;
442 
443         retval = dev->sdr_head;
444         tmp = (dev->sdr_head + n) % PPC4XX_NUM_SD;
445         if (dev->sdr_head > dev->gdr_tail) {
446                 if (tmp < dev->sdr_head && tmp >= dev->sdr_tail)
447                         return ERING_WAS_FULL;
448         } else if (dev->sdr_head < dev->sdr_tail) {
449                 if (tmp < dev->sdr_head || tmp >= dev->sdr_tail)
450                         return ERING_WAS_FULL;
451         } /* the head = tail, or empty case is already take cared */
452         dev->sdr_head = tmp;
453 
454         return retval;
455 }
456 
457 static u32 crypto4xx_put_sd_to_sdr(struct crypto4xx_device *dev)
458 {
459         unsigned long flags;
460 
461         spin_lock_irqsave(&dev->core_dev->lock, flags);
462         if (dev->sdr_tail == dev->sdr_head) {
463                 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
464                 return 0;
465         }
466         if (dev->sdr_tail != PPC4XX_LAST_SD)
467                 dev->sdr_tail++;
468         else
469                 dev->sdr_tail = 0;
470         spin_unlock_irqrestore(&dev->core_dev->lock, flags);
471 
472         return 0;
473 }
474 
475 static inline struct ce_sd *crypto4xx_get_sdp(struct crypto4xx_device *dev,
476                                               dma_addr_t *sd_dma, u32 idx)
477 {
478         *sd_dma = dev->sdr_pa + sizeof(struct ce_sd) * idx;
479 
480         return  (struct ce_sd *)(dev->sdr + sizeof(struct ce_sd) * idx);
481 }
482 
483 static u32 crypto4xx_fill_one_page(struct crypto4xx_device *dev,
484                                    dma_addr_t *addr, u32 *length,
485                                    u32 *idx, u32 *offset, u32 *nbytes)
486 {
487         u32 len;
488 
489         if (*length > dev->scatter_buffer_size) {
490                 memcpy(phys_to_virt(*addr),
491                         dev->scatter_buffer_va +
492                         *idx * dev->scatter_buffer_size + *offset,
493                         dev->scatter_buffer_size);
494                 *offset = 0;
495                 *length -= dev->scatter_buffer_size;
496                 *nbytes -= dev->scatter_buffer_size;
497                 if (*idx == PPC4XX_LAST_SD)
498                         *idx = 0;
499                 else
500                         (*idx)++;
501                 *addr = *addr +  dev->scatter_buffer_size;
502                 return 1;
503         } else if (*length < dev->scatter_buffer_size) {
504                 memcpy(phys_to_virt(*addr),
505                         dev->scatter_buffer_va +
506                         *idx * dev->scatter_buffer_size + *offset, *length);
507                 if ((*offset + *length) == dev->scatter_buffer_size) {
508                         if (*idx == PPC4XX_LAST_SD)
509                                 *idx = 0;
510                         else
511                                 (*idx)++;
512                         *nbytes -= *length;
513                         *offset = 0;
514                 } else {
515                         *nbytes -= *length;
516                         *offset += *length;
517                 }
518 
519                 return 0;
520         } else {
521                 len = (*nbytes <= dev->scatter_buffer_size) ?
522                                 (*nbytes) : dev->scatter_buffer_size;
523                 memcpy(phys_to_virt(*addr),
524                         dev->scatter_buffer_va +
525                         *idx * dev->scatter_buffer_size + *offset,
526                         len);
527                 *offset = 0;
528                 *nbytes -= len;
529 
530                 if (*idx == PPC4XX_LAST_SD)
531                         *idx = 0;
532                 else
533                         (*idx)++;
534 
535                 return 0;
536     }
537 }
538 
539 static void crypto4xx_copy_pkt_to_dst(struct crypto4xx_device *dev,
540                                       struct ce_pd *pd,
541                                       struct pd_uinfo *pd_uinfo,
542                                       u32 nbytes,
543                                       struct scatterlist *dst)
544 {
545         dma_addr_t addr;
546         u32 this_sd;
547         u32 offset;
548         u32 len;
549         u32 i;
550         u32 sg_len;
551         struct scatterlist *sg;
552 
553         this_sd = pd_uinfo->first_sd;
554         offset = 0;
555         i = 0;
556 
557         while (nbytes) {
558                 sg = &dst[i];
559                 sg_len = sg->length;
560                 addr = dma_map_page(dev->core_dev->device, sg_page(sg),
561                                 sg->offset, sg->length, DMA_TO_DEVICE);
562 
563                 if (offset == 0) {
564                         len = (nbytes <= sg->length) ? nbytes : sg->length;
565                         while (crypto4xx_fill_one_page(dev, &addr, &len,
566                                 &this_sd, &offset, &nbytes))
567                                 ;
568                         if (!nbytes)
569                                 return;
570                         i++;
571                 } else {
572                         len = (nbytes <= (dev->scatter_buffer_size - offset)) ?
573                                 nbytes : (dev->scatter_buffer_size - offset);
574                         len = (sg->length < len) ? sg->length : len;
575                         while (crypto4xx_fill_one_page(dev, &addr, &len,
576                                                &this_sd, &offset, &nbytes))
577                                 ;
578                         if (!nbytes)
579                                 return;
580                         sg_len -= len;
581                         if (sg_len) {
582                                 addr += len;
583                                 while (crypto4xx_fill_one_page(dev, &addr,
584                                         &sg_len, &this_sd, &offset, &nbytes))
585                                         ;
586                         }
587                         i++;
588                 }
589         }
590 }
591 
592 static u32 crypto4xx_copy_digest_to_dst(struct pd_uinfo *pd_uinfo,
593                                         struct crypto4xx_ctx *ctx)
594 {
595         struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *) ctx->sa_in;
596         struct sa_state_record *state_record =
597                                 (struct sa_state_record *) pd_uinfo->sr_va;
598 
599         if (sa->sa_command_0.bf.hash_alg == SA_HASH_ALG_SHA1) {
600                 memcpy((void *) pd_uinfo->dest_va, state_record->save_digest,
601                        SA_HASH_ALG_SHA1_DIGEST_SIZE);
602         }
603 
604         return 0;
605 }
606 
607 static void crypto4xx_ret_sg_desc(struct crypto4xx_device *dev,
608                                   struct pd_uinfo *pd_uinfo)
609 {
610         int i;
611         if (pd_uinfo->num_gd) {
612                 for (i = 0; i < pd_uinfo->num_gd; i++)
613                         crypto4xx_put_gd_to_gdr(dev);
614                 pd_uinfo->first_gd = 0xffffffff;
615                 pd_uinfo->num_gd = 0;
616         }
617         if (pd_uinfo->num_sd) {
618                 for (i = 0; i < pd_uinfo->num_sd; i++)
619                         crypto4xx_put_sd_to_sdr(dev);
620 
621                 pd_uinfo->first_sd = 0xffffffff;
622                 pd_uinfo->num_sd = 0;
623         }
624 }
625 
626 static u32 crypto4xx_ablkcipher_done(struct crypto4xx_device *dev,
627                                      struct pd_uinfo *pd_uinfo,
628                                      struct ce_pd *pd)
629 {
630         struct crypto4xx_ctx *ctx;
631         struct ablkcipher_request *ablk_req;
632         struct scatterlist *dst;
633         dma_addr_t addr;
634 
635         ablk_req = ablkcipher_request_cast(pd_uinfo->async_req);
636         ctx  = crypto_tfm_ctx(ablk_req->base.tfm);
637 
638         if (pd_uinfo->using_sd) {
639                 crypto4xx_copy_pkt_to_dst(dev, pd, pd_uinfo, ablk_req->nbytes,
640                                           ablk_req->dst);
641         } else {
642                 dst = pd_uinfo->dest_va;
643                 addr = dma_map_page(dev->core_dev->device, sg_page(dst),
644                                     dst->offset, dst->length, DMA_FROM_DEVICE);
645         }
646         crypto4xx_ret_sg_desc(dev, pd_uinfo);
647         if (ablk_req->base.complete != NULL)
648                 ablk_req->base.complete(&ablk_req->base, 0);
649 
650         return 0;
651 }
652 
653 static u32 crypto4xx_ahash_done(struct crypto4xx_device *dev,
654                                 struct pd_uinfo *pd_uinfo)
655 {
656         struct crypto4xx_ctx *ctx;
657         struct ahash_request *ahash_req;
658 
659         ahash_req = ahash_request_cast(pd_uinfo->async_req);
660         ctx  = crypto_tfm_ctx(ahash_req->base.tfm);
661 
662         crypto4xx_copy_digest_to_dst(pd_uinfo,
663                                      crypto_tfm_ctx(ahash_req->base.tfm));
664         crypto4xx_ret_sg_desc(dev, pd_uinfo);
665         /* call user provided callback function x */
666         if (ahash_req->base.complete != NULL)
667                 ahash_req->base.complete(&ahash_req->base, 0);
668 
669         return 0;
670 }
671 
672 static u32 crypto4xx_pd_done(struct crypto4xx_device *dev, u32 idx)
673 {
674         struct ce_pd *pd;
675         struct pd_uinfo *pd_uinfo;
676 
677         pd =  dev->pdr + sizeof(struct ce_pd)*idx;
678         pd_uinfo = dev->pdr_uinfo + sizeof(struct pd_uinfo)*idx;
679         if (crypto_tfm_alg_type(pd_uinfo->async_req->tfm) ==
680                         CRYPTO_ALG_TYPE_ABLKCIPHER)
681                 return crypto4xx_ablkcipher_done(dev, pd_uinfo, pd);
682         else
683                 return crypto4xx_ahash_done(dev, pd_uinfo);
684 }
685 
686 /**
687  * Note: Only use this function to copy items that is word aligned.
688  */
689 void crypto4xx_memcpy_le(unsigned int *dst,
690                          const unsigned char *buf,
691                          int len)
692 {
693         u8 *tmp;
694         for (; len >= 4; buf += 4, len -= 4)
695                 *dst++ = cpu_to_le32(*(unsigned int *) buf);
696 
697         tmp = (u8 *)dst;
698         switch (len) {
699         case 3:
700                 *tmp++ = 0;
701                 *tmp++ = *(buf+2);
702                 *tmp++ = *(buf+1);
703                 *tmp++ = *buf;
704                 break;
705         case 2:
706                 *tmp++ = 0;
707                 *tmp++ = 0;
708                 *tmp++ = *(buf+1);
709                 *tmp++ = *buf;
710                 break;
711         case 1:
712                 *tmp++ = 0;
713                 *tmp++ = 0;
714                 *tmp++ = 0;
715                 *tmp++ = *buf;
716                 break;
717         default:
718                 break;
719         }
720 }
721 
722 static void crypto4xx_stop_all(struct crypto4xx_core_device *core_dev)
723 {
724         crypto4xx_destroy_pdr(core_dev->dev);
725         crypto4xx_destroy_gdr(core_dev->dev);
726         crypto4xx_destroy_sdr(core_dev->dev);
727         iounmap(core_dev->dev->ce_base);
728         kfree(core_dev->dev);
729         kfree(core_dev);
730 }
731 
732 void crypto4xx_return_pd(struct crypto4xx_device *dev,
733                          u32 pd_entry, struct ce_pd *pd,
734                          struct pd_uinfo *pd_uinfo)
735 {
736         /* irq should be already disabled */
737         dev->pdr_head = pd_entry;
738         pd->pd_ctl.w = 0;
739         pd->pd_ctl_len.w = 0;
740         pd_uinfo->state = PD_ENTRY_FREE;
741 }
742 
743 /*
744  * derive number of elements in scatterlist
745  * Shamlessly copy from talitos.c
746  */
747 static int get_sg_count(struct scatterlist *sg_list, int nbytes)
748 {
749         struct scatterlist *sg = sg_list;
750         int sg_nents = 0;
751 
752         while (nbytes) {
753                 sg_nents++;
754                 if (sg->length > nbytes)
755                         break;
756                 nbytes -= sg->length;
757                 sg = sg_next(sg);
758         }
759 
760         return sg_nents;
761 }
762 
763 static u32 get_next_gd(u32 current)
764 {
765         if (current != PPC4XX_LAST_GD)
766                 return current + 1;
767         else
768                 return 0;
769 }
770 
771 static u32 get_next_sd(u32 current)
772 {
773         if (current != PPC4XX_LAST_SD)
774                 return current + 1;
775         else
776                 return 0;
777 }
778 
779 u32 crypto4xx_build_pd(struct crypto_async_request *req,
780                        struct crypto4xx_ctx *ctx,
781                        struct scatterlist *src,
782                        struct scatterlist *dst,
783                        unsigned int datalen,
784                        void *iv, u32 iv_len)
785 {
786         struct crypto4xx_device *dev = ctx->dev;
787         dma_addr_t addr, pd_dma, sd_dma, gd_dma;
788         struct dynamic_sa_ctl *sa;
789         struct scatterlist *sg;
790         struct ce_gd *gd;
791         struct ce_pd *pd;
792         u32 num_gd, num_sd;
793         u32 fst_gd = 0xffffffff;
794         u32 fst_sd = 0xffffffff;
795         u32 pd_entry;
796         unsigned long flags;
797         struct pd_uinfo *pd_uinfo = NULL;
798         unsigned int nbytes = datalen, idx;
799         unsigned int ivlen = 0;
800         u32 gd_idx = 0;
801 
802         /* figure how many gd is needed */
803         num_gd = get_sg_count(src, datalen);
804         if (num_gd == 1)
805                 num_gd = 0;
806 
807         /* figure how many sd is needed */
808         if (sg_is_last(dst) || ctx->is_hash) {
809                 num_sd = 0;
810         } else {
811                 if (datalen > PPC4XX_SD_BUFFER_SIZE) {
812                         num_sd = datalen / PPC4XX_SD_BUFFER_SIZE;
813                         if (datalen % PPC4XX_SD_BUFFER_SIZE)
814                                 num_sd++;
815                 } else {
816                         num_sd = 1;
817                 }
818         }
819 
820         /*
821          * The follow section of code needs to be protected
822          * The gather ring and scatter ring needs to be consecutive
823          * In case of run out of any kind of descriptor, the descriptor
824          * already got must be return the original place.
825          */
826         spin_lock_irqsave(&dev->core_dev->lock, flags);
827         if (num_gd) {
828                 fst_gd = crypto4xx_get_n_gd(dev, num_gd);
829                 if (fst_gd == ERING_WAS_FULL) {
830                         spin_unlock_irqrestore(&dev->core_dev->lock, flags);
831                         return -EAGAIN;
832                 }
833         }
834         if (num_sd) {
835                 fst_sd = crypto4xx_get_n_sd(dev, num_sd);
836                 if (fst_sd == ERING_WAS_FULL) {
837                         if (num_gd)
838                                 dev->gdr_head = fst_gd;
839                         spin_unlock_irqrestore(&dev->core_dev->lock, flags);
840                         return -EAGAIN;
841                 }
842         }
843         pd_entry = crypto4xx_get_pd_from_pdr_nolock(dev);
844         if (pd_entry == ERING_WAS_FULL) {
845                 if (num_gd)
846                         dev->gdr_head = fst_gd;
847                 if (num_sd)
848                         dev->sdr_head = fst_sd;
849                 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
850                 return -EAGAIN;
851         }
852         spin_unlock_irqrestore(&dev->core_dev->lock, flags);
853 
854         pd_uinfo = (struct pd_uinfo *)(dev->pdr_uinfo +
855                                        sizeof(struct pd_uinfo) * pd_entry);
856         pd = crypto4xx_get_pdp(dev, &pd_dma, pd_entry);
857         pd_uinfo->async_req = req;
858         pd_uinfo->num_gd = num_gd;
859         pd_uinfo->num_sd = num_sd;
860 
861         if (iv_len || ctx->is_hash) {
862                 ivlen = iv_len;
863                 pd->sa = pd_uinfo->sa_pa;
864                 sa = (struct dynamic_sa_ctl *) pd_uinfo->sa_va;
865                 if (ctx->direction == DIR_INBOUND)
866                         memcpy(sa, ctx->sa_in, ctx->sa_len * 4);
867                 else
868                         memcpy(sa, ctx->sa_out, ctx->sa_len * 4);
869 
870                 memcpy((void *) sa + ctx->offset_to_sr_ptr,
871                         &pd_uinfo->sr_pa, 4);
872 
873                 if (iv_len)
874                         crypto4xx_memcpy_le(pd_uinfo->sr_va, iv, iv_len);
875         } else {
876                 if (ctx->direction == DIR_INBOUND) {
877                         pd->sa = ctx->sa_in_dma_addr;
878                         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
879                 } else {
880                         pd->sa = ctx->sa_out_dma_addr;
881                         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
882                 }
883         }
884         pd->sa_len = ctx->sa_len;
885         if (num_gd) {
886                 /* get first gd we are going to use */
887                 gd_idx = fst_gd;
888                 pd_uinfo->first_gd = fst_gd;
889                 pd_uinfo->num_gd = num_gd;
890                 gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx);
891                 pd->src = gd_dma;
892                 /* enable gather */
893                 sa->sa_command_0.bf.gather = 1;
894                 idx = 0;
895                 src = &src[0];
896                 /* walk the sg, and setup gather array */
897                 while (nbytes) {
898                         sg = &src[idx];
899                         addr = dma_map_page(dev->core_dev->device, sg_page(sg),
900                                     sg->offset, sg->length, DMA_TO_DEVICE);
901                         gd->ptr = addr;
902                         gd->ctl_len.len = sg->length;
903                         gd->ctl_len.done = 0;
904                         gd->ctl_len.ready = 1;
905                         if (sg->length >= nbytes)
906                                 break;
907                         nbytes -= sg->length;
908                         gd_idx = get_next_gd(gd_idx);
909                         gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx);
910                         idx++;
911                 }
912         } else {
913                 pd->src = (u32)dma_map_page(dev->core_dev->device, sg_page(src),
914                                 src->offset, src->length, DMA_TO_DEVICE);
915                 /*
916                  * Disable gather in sa command
917                  */
918                 sa->sa_command_0.bf.gather = 0;
919                 /*
920                  * Indicate gather array is not used
921                  */
922                 pd_uinfo->first_gd = 0xffffffff;
923                 pd_uinfo->num_gd = 0;
924         }
925         if (ctx->is_hash || sg_is_last(dst)) {
926                 /*
927                  * we know application give us dst a whole piece of memory
928                  * no need to use scatter ring.
929                  * In case of is_hash, the icv is always at end of src data.
930                  */
931                 pd_uinfo->using_sd = 0;
932                 pd_uinfo->first_sd = 0xffffffff;
933                 pd_uinfo->num_sd = 0;
934                 pd_uinfo->dest_va = dst;
935                 sa->sa_command_0.bf.scatter = 0;
936                 if (ctx->is_hash)
937                         pd->dest = virt_to_phys((void *)dst);
938                 else
939                         pd->dest = (u32)dma_map_page(dev->core_dev->device,
940                                         sg_page(dst), dst->offset,
941                                         dst->length, DMA_TO_DEVICE);
942         } else {
943                 struct ce_sd *sd = NULL;
944                 u32 sd_idx = fst_sd;
945                 nbytes = datalen;
946                 sa->sa_command_0.bf.scatter = 1;
947                 pd_uinfo->using_sd = 1;
948                 pd_uinfo->dest_va = dst;
949                 pd_uinfo->first_sd = fst_sd;
950                 pd_uinfo->num_sd = num_sd;
951                 sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx);
952                 pd->dest = sd_dma;
953                 /* setup scatter descriptor */
954                 sd->ctl.done = 0;
955                 sd->ctl.rdy = 1;
956                 /* sd->ptr should be setup by sd_init routine*/
957                 idx = 0;
958                 if (nbytes >= PPC4XX_SD_BUFFER_SIZE)
959                         nbytes -= PPC4XX_SD_BUFFER_SIZE;
960                 else
961                         nbytes = 0;
962                 while (nbytes) {
963                         sd_idx = get_next_sd(sd_idx);
964                         sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx);
965                         /* setup scatter descriptor */
966                         sd->ctl.done = 0;
967                         sd->ctl.rdy = 1;
968                         if (nbytes >= PPC4XX_SD_BUFFER_SIZE)
969                                 nbytes -= PPC4XX_SD_BUFFER_SIZE;
970                         else
971                                 /*
972                                  * SD entry can hold PPC4XX_SD_BUFFER_SIZE,
973                                  * which is more than nbytes, so done.
974                                  */
975                                 nbytes = 0;
976                 }
977         }
978 
979         sa->sa_command_1.bf.hash_crypto_offset = 0;
980         pd->pd_ctl.w = ctx->pd_ctl;
981         pd->pd_ctl_len.w = 0x00400000 | (ctx->bypass << 24) | datalen;
982         pd_uinfo->state = PD_ENTRY_INUSE;
983         wmb();
984         /* write any value to push engine to read a pd */
985         writel(1, dev->ce_base + CRYPTO4XX_INT_DESCR_RD);
986         return -EINPROGRESS;
987 }
988 
989 /**
990  * Algorithm Registration Functions
991  */
992 static int crypto4xx_alg_init(struct crypto_tfm *tfm)
993 {
994         struct crypto_alg *alg = tfm->__crt_alg;
995         struct crypto4xx_alg *amcc_alg = crypto_alg_to_crypto4xx_alg(alg);
996         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
997 
998         ctx->dev = amcc_alg->dev;
999         ctx->sa_in = NULL;
1000         ctx->sa_out = NULL;
1001         ctx->sa_in_dma_addr = 0;
1002         ctx->sa_out_dma_addr = 0;
1003         ctx->sa_len = 0;
1004 
1005         switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
1006         default:
1007                 tfm->crt_ablkcipher.reqsize = sizeof(struct crypto4xx_ctx);
1008                 break;
1009         case CRYPTO_ALG_TYPE_AHASH:
1010                 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
1011                                          sizeof(struct crypto4xx_ctx));
1012                 break;
1013         }
1014 
1015         return 0;
1016 }
1017 
1018 static void crypto4xx_alg_exit(struct crypto_tfm *tfm)
1019 {
1020         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
1021 
1022         crypto4xx_free_sa(ctx);
1023         crypto4xx_free_state_record(ctx);
1024 }
1025 
1026 int crypto4xx_register_alg(struct crypto4xx_device *sec_dev,
1027                            struct crypto4xx_alg_common *crypto_alg,
1028                            int array_size)
1029 {
1030         struct crypto4xx_alg *alg;
1031         int i;
1032         int rc = 0;
1033 
1034         for (i = 0; i < array_size; i++) {
1035                 alg = kzalloc(sizeof(struct crypto4xx_alg), GFP_KERNEL);
1036                 if (!alg)
1037                         return -ENOMEM;
1038 
1039                 alg->alg = crypto_alg[i];
1040                 alg->dev = sec_dev;
1041 
1042                 switch (alg->alg.type) {
1043                 case CRYPTO_ALG_TYPE_AHASH:
1044                         rc = crypto_register_ahash(&alg->alg.u.hash);
1045                         break;
1046 
1047                 default:
1048                         rc = crypto_register_alg(&alg->alg.u.cipher);
1049                         break;
1050                 }
1051 
1052                 if (rc) {
1053                         list_del(&alg->entry);
1054                         kfree(alg);
1055                 } else {
1056                         list_add_tail(&alg->entry, &sec_dev->alg_list);
1057                 }
1058         }
1059 
1060         return 0;
1061 }
1062 
1063 static void crypto4xx_unregister_alg(struct crypto4xx_device *sec_dev)
1064 {
1065         struct crypto4xx_alg *alg, *tmp;
1066 
1067         list_for_each_entry_safe(alg, tmp, &sec_dev->alg_list, entry) {
1068                 list_del(&alg->entry);
1069                 switch (alg->alg.type) {
1070                 case CRYPTO_ALG_TYPE_AHASH:
1071                         crypto_unregister_ahash(&alg->alg.u.hash);
1072                         break;
1073 
1074                 default:
1075                         crypto_unregister_alg(&alg->alg.u.cipher);
1076                 }
1077                 kfree(alg);
1078         }
1079 }
1080 
1081 static void crypto4xx_bh_tasklet_cb(unsigned long data)
1082 {
1083         struct device *dev = (struct device *)data;
1084         struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
1085         struct pd_uinfo *pd_uinfo;
1086         struct ce_pd *pd;
1087         u32 tail;
1088 
1089         while (core_dev->dev->pdr_head != core_dev->dev->pdr_tail) {
1090                 tail = core_dev->dev->pdr_tail;
1091                 pd_uinfo = core_dev->dev->pdr_uinfo +
1092                         sizeof(struct pd_uinfo)*tail;
1093                 pd =  core_dev->dev->pdr + sizeof(struct ce_pd) * tail;
1094                 if ((pd_uinfo->state == PD_ENTRY_INUSE) &&
1095                                    pd->pd_ctl.bf.pe_done &&
1096                                    !pd->pd_ctl.bf.host_ready) {
1097                         pd->pd_ctl.bf.pe_done = 0;
1098                         crypto4xx_pd_done(core_dev->dev, tail);
1099                         crypto4xx_put_pd_to_pdr(core_dev->dev, tail);
1100                         pd_uinfo->state = PD_ENTRY_FREE;
1101                 } else {
1102                         /* if tail not done, break */
1103                         break;
1104                 }
1105         }
1106 }
1107 
1108 /**
1109  * Top Half of isr.
1110  */
1111 static irqreturn_t crypto4xx_ce_interrupt_handler(int irq, void *data)
1112 {
1113         struct device *dev = (struct device *)data;
1114         struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
1115 
1116         if (core_dev->dev->ce_base == 0)
1117                 return 0;
1118 
1119         writel(PPC4XX_INTERRUPT_CLR,
1120                core_dev->dev->ce_base + CRYPTO4XX_INT_CLR);
1121         tasklet_schedule(&core_dev->tasklet);
1122 
1123         return IRQ_HANDLED;
1124 }
1125 
1126 /**
1127  * Supported Crypto Algorithms
1128  */
1129 struct crypto4xx_alg_common crypto4xx_alg[] = {
1130         /* Crypto AES modes */
1131         { .type = CRYPTO_ALG_TYPE_ABLKCIPHER, .u.cipher = {
1132                 .cra_name       = "cbc(aes)",
1133                 .cra_driver_name = "cbc-aes-ppc4xx",
1134                 .cra_priority   = CRYPTO4XX_CRYPTO_PRIORITY,
1135                 .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1136                 .cra_blocksize  = AES_BLOCK_SIZE,
1137                 .cra_ctxsize    = sizeof(struct crypto4xx_ctx),
1138                 .cra_type       = &crypto_ablkcipher_type,
1139                 .cra_init       = crypto4xx_alg_init,
1140                 .cra_exit       = crypto4xx_alg_exit,
1141                 .cra_module     = THIS_MODULE,
1142                 .cra_u          = {
1143                         .ablkcipher = {
1144                                 .min_keysize    = AES_MIN_KEY_SIZE,
1145                                 .max_keysize    = AES_MAX_KEY_SIZE,
1146                                 .ivsize         = AES_IV_SIZE,
1147                                 .setkey         = crypto4xx_setkey_aes_cbc,
1148                                 .encrypt        = crypto4xx_encrypt,
1149                                 .decrypt        = crypto4xx_decrypt,
1150                         }
1151                 }
1152         }},
1153 };
1154 
1155 /**
1156  * Module Initialization Routine
1157  */
1158 static int __init crypto4xx_probe(struct platform_device *ofdev)
1159 {
1160         int rc;
1161         struct resource res;
1162         struct device *dev = &ofdev->dev;
1163         struct crypto4xx_core_device *core_dev;
1164 
1165         rc = of_address_to_resource(ofdev->dev.of_node, 0, &res);
1166         if (rc)
1167                 return -ENODEV;
1168 
1169         if (of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-crypto")) {
1170                 mtdcri(SDR0, PPC460EX_SDR0_SRST,
1171                        mfdcri(SDR0, PPC460EX_SDR0_SRST) | PPC460EX_CE_RESET);
1172                 mtdcri(SDR0, PPC460EX_SDR0_SRST,
1173                        mfdcri(SDR0, PPC460EX_SDR0_SRST) & ~PPC460EX_CE_RESET);
1174         } else if (of_find_compatible_node(NULL, NULL,
1175                         "amcc,ppc405ex-crypto")) {
1176                 mtdcri(SDR0, PPC405EX_SDR0_SRST,
1177                        mfdcri(SDR0, PPC405EX_SDR0_SRST) | PPC405EX_CE_RESET);
1178                 mtdcri(SDR0, PPC405EX_SDR0_SRST,
1179                        mfdcri(SDR0, PPC405EX_SDR0_SRST) & ~PPC405EX_CE_RESET);
1180         } else if (of_find_compatible_node(NULL, NULL,
1181                         "amcc,ppc460sx-crypto")) {
1182                 mtdcri(SDR0, PPC460SX_SDR0_SRST,
1183                        mfdcri(SDR0, PPC460SX_SDR0_SRST) | PPC460SX_CE_RESET);
1184                 mtdcri(SDR0, PPC460SX_SDR0_SRST,
1185                        mfdcri(SDR0, PPC460SX_SDR0_SRST) & ~PPC460SX_CE_RESET);
1186         } else {
1187                 printk(KERN_ERR "Crypto Function Not supported!\n");
1188                 return -EINVAL;
1189         }
1190 
1191         core_dev = kzalloc(sizeof(struct crypto4xx_core_device), GFP_KERNEL);
1192         if (!core_dev)
1193                 return -ENOMEM;
1194 
1195         dev_set_drvdata(dev, core_dev);
1196         core_dev->ofdev = ofdev;
1197         core_dev->dev = kzalloc(sizeof(struct crypto4xx_device), GFP_KERNEL);
1198         if (!core_dev->dev)
1199                 goto err_alloc_dev;
1200 
1201         core_dev->dev->core_dev = core_dev;
1202         core_dev->device = dev;
1203         spin_lock_init(&core_dev->lock);
1204         INIT_LIST_HEAD(&core_dev->dev->alg_list);
1205         rc = crypto4xx_build_pdr(core_dev->dev);
1206         if (rc)
1207                 goto err_build_pdr;
1208 
1209         rc = crypto4xx_build_gdr(core_dev->dev);
1210         if (rc)
1211                 goto err_build_gdr;
1212 
1213         rc = crypto4xx_build_sdr(core_dev->dev);
1214         if (rc)
1215                 goto err_build_sdr;
1216 
1217         /* Init tasklet for bottom half processing */
1218         tasklet_init(&core_dev->tasklet, crypto4xx_bh_tasklet_cb,
1219                      (unsigned long) dev);
1220 
1221         /* Register for Crypto isr, Crypto Engine IRQ */
1222         core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
1223         rc = request_irq(core_dev->irq, crypto4xx_ce_interrupt_handler, 0,
1224                          core_dev->dev->name, dev);
1225         if (rc)
1226                 goto err_request_irq;
1227 
1228         core_dev->dev->ce_base = of_iomap(ofdev->dev.of_node, 0);
1229         if (!core_dev->dev->ce_base) {
1230                 dev_err(dev, "failed to of_iomap\n");
1231                 rc = -ENOMEM;
1232                 goto err_iomap;
1233         }
1234 
1235         /* need to setup pdr, rdr, gdr and sdr before this */
1236         crypto4xx_hw_init(core_dev->dev);
1237 
1238         /* Register security algorithms with Linux CryptoAPI */
1239         rc = crypto4xx_register_alg(core_dev->dev, crypto4xx_alg,
1240                                ARRAY_SIZE(crypto4xx_alg));
1241         if (rc)
1242                 goto err_start_dev;
1243 
1244         return 0;
1245 
1246 err_start_dev:
1247         iounmap(core_dev->dev->ce_base);
1248 err_iomap:
1249         free_irq(core_dev->irq, dev);
1250 err_request_irq:
1251         irq_dispose_mapping(core_dev->irq);
1252         tasklet_kill(&core_dev->tasklet);
1253         crypto4xx_destroy_sdr(core_dev->dev);
1254 err_build_sdr:
1255         crypto4xx_destroy_gdr(core_dev->dev);
1256 err_build_gdr:
1257         crypto4xx_destroy_pdr(core_dev->dev);
1258 err_build_pdr:
1259         kfree(core_dev->dev);
1260 err_alloc_dev:
1261         kfree(core_dev);
1262 
1263         return rc;
1264 }
1265 
1266 static int __exit crypto4xx_remove(struct platform_device *ofdev)
1267 {
1268         struct device *dev = &ofdev->dev;
1269         struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
1270 
1271         free_irq(core_dev->irq, dev);
1272         irq_dispose_mapping(core_dev->irq);
1273 
1274         tasklet_kill(&core_dev->tasklet);
1275         /* Un-register with Linux CryptoAPI */
1276         crypto4xx_unregister_alg(core_dev->dev);
1277         /* Free all allocated memory */
1278         crypto4xx_stop_all(core_dev);
1279 
1280         return 0;
1281 }
1282 
1283 static const struct of_device_id crypto4xx_match[] = {
1284         { .compatible      = "amcc,ppc4xx-crypto",},
1285         { },
1286 };
1287 
1288 static struct platform_driver crypto4xx_driver = {
1289         .driver = {
1290                 .name = "crypto4xx",
1291                 .owner = THIS_MODULE,
1292                 .of_match_table = crypto4xx_match,
1293         },
1294         .probe          = crypto4xx_probe,
1295         .remove         = __exit_p(crypto4xx_remove),
1296 };
1297 
1298 module_platform_driver(crypto4xx_driver);
1299 
1300 MODULE_LICENSE("GPL");
1301 MODULE_AUTHOR("James Hsiao <jhsiao@amcc.com>");
1302 MODULE_DESCRIPTION("Driver for AMCC PPC4xx crypto accelerator");
1303 
1304 

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