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cryp.h
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1 
11 #ifndef _CRYP_H_
12 #define _CRYP_H_
13 
14 #include <linux/completion.h>
15 #include <linux/dmaengine.h>
16 #include <linux/klist.h>
17 #include <linux/mutex.h>
18 
19 #define DEV_DBG_NAME "crypX crypX:"
20 
21 /* CRYP enable/disable */
22 enum cryp_crypen {
23  CRYP_CRYPEN_DISABLE = 0,
24  CRYP_CRYPEN_ENABLE = 1
25 };
26 
27 /* CRYP Start Computation enable/disable */
28 enum cryp_start {
29  CRYP_START_DISABLE = 0,
30  CRYP_START_ENABLE = 1
31 };
32 
33 /* CRYP Init Signal enable/disable */
34 enum cryp_init {
35  CRYP_INIT_DISABLE = 0,
36  CRYP_INIT_ENABLE = 1
37 };
38 
39 /* Cryp State enable/disable */
40 enum cryp_state {
41  CRYP_STATE_DISABLE = 0,
42  CRYP_STATE_ENABLE = 1
43 };
44 
45 /* Key preparation bit enable */
46 enum cryp_key_prep {
47  KSE_DISABLED = 0,
48  KSE_ENABLED = 1
49 };
50 
51 /* Key size for AES */
52 #define CRYP_KEY_SIZE_128 (0)
53 #define CRYP_KEY_SIZE_192 (1)
54 #define CRYP_KEY_SIZE_256 (2)
55 
56 /* AES modes */
57 enum cryp_algo_mode {
58  CRYP_ALGO_TDES_ECB,
59  CRYP_ALGO_TDES_CBC,
60  CRYP_ALGO_DES_ECB,
61  CRYP_ALGO_DES_CBC,
62  CRYP_ALGO_AES_ECB,
63  CRYP_ALGO_AES_CBC,
64  CRYP_ALGO_AES_CTR,
65  CRYP_ALGO_AES_XTS
66 };
67 
68 /* Cryp Encryption or Decryption */
69 enum cryp_algorithm_dir {
70  CRYP_ALGORITHM_ENCRYPT,
71  CRYP_ALGORITHM_DECRYPT
72 };
73 
74 /* Hardware access method */
75 enum cryp_mode {
76  CRYP_MODE_POLLING,
77  CRYP_MODE_INTERRUPT,
78  CRYP_MODE_DMA
79 };
80 
89 struct cryp_config {
90  int keysize;
91  enum cryp_algo_mode algomode;
92  enum cryp_algorithm_dir algodir;
93 };
94 
102 struct cryp_protection_config {
103  enum cryp_state privilege_access;
104  enum cryp_state secure_access;
105 };
106 
107 /* Cryp status */
108 enum cryp_status_id {
109  CRYP_STATUS_BUSY = 0x10,
110  CRYP_STATUS_OUTPUT_FIFO_FULL = 0x08,
111  CRYP_STATUS_OUTPUT_FIFO_NOT_EMPTY = 0x04,
112  CRYP_STATUS_INPUT_FIFO_NOT_FULL = 0x02,
113  CRYP_STATUS_INPUT_FIFO_EMPTY = 0x01
114 };
115 
116 /* Cryp DMA interface */
117 enum cryp_dma_req_type {
118  CRYP_DMA_DISABLE_BOTH,
119  CRYP_DMA_ENABLE_IN_DATA,
120  CRYP_DMA_ENABLE_OUT_DATA,
121  CRYP_DMA_ENABLE_BOTH_DIRECTIONS
122 };
123 
124 enum cryp_dma_channel {
125  CRYP_DMA_RX = 0,
126  CRYP_DMA_TX
127 };
128 
129 /* Key registers */
130 enum cryp_key_reg_index {
131  CRYP_KEY_REG_1,
132  CRYP_KEY_REG_2,
133  CRYP_KEY_REG_3,
134  CRYP_KEY_REG_4
135 };
136 
137 /* Key register left and right */
138 struct cryp_key_value {
139  u32 key_value_left;
140  u32 key_value_right;
141 };
142 
143 /* Cryp Initialization structure */
144 enum cryp_init_vector_index {
145  CRYP_INIT_VECTOR_INDEX_0,
146  CRYP_INIT_VECTOR_INDEX_1
147 };
148 
149 /* struct cryp_init_vector_value -
150  * @init_value_left
151  * @init_value_right
152  * */
153 struct cryp_init_vector_value {
154  u32 init_value_left;
155  u32 init_value_right;
156 };
157 
180 struct cryp_device_context {
181  u32 cr;
182  u32 dmacr;
183  u32 imsc;
184 
185  u32 key_1_l;
186  u32 key_1_r;
187  u32 key_2_l;
188  u32 key_2_r;
189  u32 key_3_l;
190  u32 key_3_r;
191  u32 key_4_l;
192  u32 key_4_r;
193 
194  u32 init_vect_0_l;
195  u32 init_vect_0_r;
196  u32 init_vect_1_l;
197  u32 init_vect_1_r;
198 
199  u32 din;
200  u32 dout;
201 };
202 
203 struct cryp_dma {
204  dma_cap_mask_t mask;
205  struct completion cryp_dma_complete;
206  struct dma_chan *chan_cryp2mem;
207  struct dma_chan *chan_mem2cryp;
208  struct stedma40_chan_cfg *cfg_cryp2mem;
209  struct stedma40_chan_cfg *cfg_mem2cryp;
210  int sg_src_len;
211  int sg_dst_len;
212  struct scatterlist *sg_src;
213  struct scatterlist *sg_dst;
214  int nents_src;
215  int nents_dst;
216 };
217 
233 struct cryp_device_data {
234  struct cryp_register __iomem *base;
235  struct device *dev;
236  struct clk *clk;
237  struct regulator *pwr_regulator;
238  int power_status;
239  struct spinlock ctx_lock;
240  struct cryp_ctx *current_ctx;
241  struct klist_node list_node;
242  struct cryp_dma dma;
243  bool power_state;
244  struct spinlock power_state_spinlock;
245  bool restore_dev_ctx;
246 };
247 
248 void cryp_wait_until_done(struct cryp_device_data *device_data);
249 
250 /* Initialization functions */
251 
252 int cryp_check(struct cryp_device_data *device_data);
253 
254 void cryp_activity(struct cryp_device_data *device_data,
255  enum cryp_crypen cryp_crypen);
256 
257 void cryp_flush_inoutfifo(struct cryp_device_data *device_data);
258 
259 int cryp_set_configuration(struct cryp_device_data *device_data,
260  struct cryp_config *cryp_config,
261  u32 *control_register);
262 
263 void cryp_configure_for_dma(struct cryp_device_data *device_data,
264  enum cryp_dma_req_type dma_req);
265 
266 int cryp_configure_key_values(struct cryp_device_data *device_data,
267  enum cryp_key_reg_index key_reg_index,
268  struct cryp_key_value key_value);
269 
270 int cryp_configure_init_vector(struct cryp_device_data *device_data,
271  enum cryp_init_vector_index
272  init_vector_index,
273  struct cryp_init_vector_value
274  init_vector_value);
275 
276 int cryp_configure_protection(struct cryp_device_data *device_data,
277  struct cryp_protection_config *p_protect_config);
278 
279 /* Power management funtions */
280 void cryp_save_device_context(struct cryp_device_data *device_data,
281  struct cryp_device_context *ctx,
282  int cryp_mode);
283 
284 void cryp_restore_device_context(struct cryp_device_data *device_data,
285  struct cryp_device_context *ctx);
286 
287 /* Data transfer and status bits. */
288 int cryp_is_logic_busy(struct cryp_device_data *device_data);
289 
290 int cryp_get_status(struct cryp_device_data *device_data);
291 
298 int cryp_write_indata(struct cryp_device_data *device_data, u32 write_data);
299 
306 int cryp_read_outdata(struct cryp_device_data *device_data, u32 *read_data);
307 
308 #endif /* _CRYP_H_ */
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