drivers/crypto/ux500/cryp/cryp.h

   1 /**
   2  * Copyright (C) ST-Ericsson SA 2010
   3  * Author: Shujuan Chen <shujuan.chen@stericsson.com> for ST-Ericsson.
   4  * Author: Jonas Linde <jonas.linde@stericsson.com> for ST-Ericsson.
   5  * Author: Joakim Bech <joakim.xx.bech@stericsson.com> for ST-Ericsson.
   6  * Author: Berne Hebark <berne.herbark@stericsson.com> for ST-Ericsson.
   7  * Author: Niklas Hernaeus <niklas.hernaeus@stericsson.com> for ST-Ericsson.
   8  * License terms: GNU General Public License (GPL) version 2
   9  */
  10
  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
  81 /**
  82  * struct cryp_config -
  83  * @keysize: Key size for AES
  84  * @algomode: AES modes
  85  * @algodir: Cryp Encryption or Decryption
  86  *
  87  * CRYP configuration structure to be passed to set configuration
  88  */
  89 struct cryp_config {
  90         int keysize;
  91         enum cryp_algo_mode algomode;
  92         enum cryp_algorithm_dir algodir;
  93 };
  94
  95 /**
  96  * struct cryp_protection_config -
  97  * @privilege_access: Privileged cryp state enable/disable
  98  * @secure_access: Secure cryp state enable/disable
  99  *
 100  * Protection configuration structure for setting privilage access
 101  */
 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 #define CRYP_DMA_TX_FIFO        0x08
 118 #define CRYP_DMA_RX_FIFO        0x10
 119
 120 enum cryp_dma_req_type {
 121         CRYP_DMA_DISABLE_BOTH,
 122         CRYP_DMA_ENABLE_IN_DATA,
 123         CRYP_DMA_ENABLE_OUT_DATA,
 124         CRYP_DMA_ENABLE_BOTH_DIRECTIONS
 125 };
 126
 127 enum cryp_dma_channel {
 128         CRYP_DMA_RX = 0,
 129         CRYP_DMA_TX
 130 };
 131
 132 /* Key registers */
 133 enum cryp_key_reg_index {
 134         CRYP_KEY_REG_1,
 135         CRYP_KEY_REG_2,
 136         CRYP_KEY_REG_3,
 137         CRYP_KEY_REG_4
 138 };
 139
 140 /* Key register left and right */
 141 struct cryp_key_value {
 142         u32 key_value_left;
 143         u32 key_value_right;
 144 };
 145
 146 /* Cryp Initialization structure */
 147 enum cryp_init_vector_index {
 148         CRYP_INIT_VECTOR_INDEX_0,
 149         CRYP_INIT_VECTOR_INDEX_1
 150 };
 151
 152 /* struct cryp_init_vector_value -
 153  * @init_value_left
 154  * @init_value_right
 155  * */
 156 struct cryp_init_vector_value {
 157         u32 init_value_left;
 158         u32 init_value_right;
 159 };
 160
 161 /**
 162  * struct cryp_device_context - structure for a cryp context.
 163  * @cr: control register
 164  * @dmacr: DMA control register
 165  * @imsc: Interrupt mask set/clear register
 166  * @key_1_l: Key 1l register
 167  * @key_1_r: Key 1r register
 168  * @key_2_l: Key 2l register
 169  * @key_2_r: Key 2r register
 170  * @key_3_l: Key 3l register
 171  * @key_3_r: Key 3r register
 172  * @key_4_l: Key 4l register
 173  * @key_4_r: Key 4r register
 174  * @init_vect_0_l: Initialization vector 0l register
 175  * @init_vect_0_r: Initialization vector 0r register
 176  * @init_vect_1_l: Initialization vector 1l register
 177  * @init_vect_1_r: Initialization vector 0r register
 178  * @din: Data in register
 179  * @dout: Data out register
 180  *
 181  * CRYP power management specifc structure.
 182  */
 183 struct cryp_device_context {
 184         u32 cr;
 185         u32 dmacr;
 186         u32 imsc;
 187
 188         u32 key_1_l;
 189         u32 key_1_r;
 190         u32 key_2_l;
 191         u32 key_2_r;
 192         u32 key_3_l;
 193         u32 key_3_r;
 194         u32 key_4_l;
 195         u32 key_4_r;
 196
 197         u32 init_vect_0_l;
 198         u32 init_vect_0_r;
 199         u32 init_vect_1_l;
 200         u32 init_vect_1_r;
 201
 202         u32 din;
 203         u32 dout;
 204 };
 205
 206 struct cryp_dma {
 207         dma_cap_mask_t mask;
 208         struct completion cryp_dma_complete;
 209         struct dma_chan *chan_cryp2mem;
 210         struct dma_chan *chan_mem2cryp;
 211         struct stedma40_chan_cfg *cfg_cryp2mem;
 212         struct stedma40_chan_cfg *cfg_mem2cryp;
 213         int sg_src_len;
 214         int sg_dst_len;
 215         struct scatterlist *sg_src;
 216         struct scatterlist *sg_dst;
 217         int nents_src;
 218         int nents_dst;
 219 };
 220
 221 /**
 222  * struct cryp_device_data - structure for a cryp device.
 223  * @base: Pointer to virtual base address of the cryp device.
 224  * @phybase: Pointer to physical memory location of the cryp device.
 225  * @dev: Pointer to the devices dev structure.
 226  * @clk: Pointer to the device's clock control.
 227  * @pwr_regulator: Pointer to the device's power control.
 228  * @power_status: Current status of the power.
 229  * @ctx_lock: Lock for current_ctx.
 230  * @current_ctx: Pointer to the currently allocated context.
 231  * @list_node: For inclusion into a klist.
 232  * @dma: The dma structure holding channel configuration.
 233  * @power_state: TRUE = power state on, FALSE = power state off.
 234  * @power_state_spinlock: Spinlock for power_state.
 235  * @restore_dev_ctx: TRUE = saved ctx, FALSE = no saved ctx.
 236  */
 237 struct cryp_device_data {
 238         struct cryp_register __iomem *base;
 239         phys_addr_t phybase;
 240         struct device *dev;
 241         struct clk *clk;
 242         struct regulator *pwr_regulator;
 243         int power_status;
 244         struct spinlock ctx_lock;
 245         struct cryp_ctx *current_ctx;
 246         struct klist_node list_node;
 247         struct cryp_dma dma;
 248         bool power_state;
 249         struct spinlock power_state_spinlock;
 250         bool restore_dev_ctx;
 251 };
 252
 253 void cryp_wait_until_done(struct cryp_device_data *device_data);
 254
 255 /* Initialization functions */
 256
 257 int cryp_check(struct cryp_device_data *device_data);
 258
 259 void cryp_activity(struct cryp_device_data *device_data,
 260                    enum cryp_crypen cryp_crypen);
 261
 262 void cryp_flush_inoutfifo(struct cryp_device_data *device_data);
 263
 264 int cryp_set_configuration(struct cryp_device_data *device_data,
 265                            struct cryp_config *cryp_config,
 266                            u32 *control_register);
 267
 268 void cryp_configure_for_dma(struct cryp_device_data *device_data,
 269                             enum cryp_dma_req_type dma_req);
 270
 271 int cryp_configure_key_values(struct cryp_device_data *device_data,
 272                               enum cryp_key_reg_index key_reg_index,
 273                               struct cryp_key_value key_value);
 274
 275 int cryp_configure_init_vector(struct cryp_device_data *device_data,
 276                                enum cryp_init_vector_index
 277                                init_vector_index,
 278                                struct cryp_init_vector_value
 279                                init_vector_value);
 280
 281 int cryp_configure_protection(struct cryp_device_data *device_data,
 282                               struct cryp_protection_config *p_protect_config);
 283
 284 /* Power management funtions */
 285 void cryp_save_device_context(struct cryp_device_data *device_data,
 286                               struct cryp_device_context *ctx,
 287                               int cryp_mode);
 288
 289 void cryp_restore_device_context(struct cryp_device_data *device_data,
 290                                  struct cryp_device_context *ctx);
 291
 292 /* Data transfer and status bits. */
 293 int cryp_is_logic_busy(struct cryp_device_data *device_data);
 294
 295 int cryp_get_status(struct cryp_device_data *device_data);
 296
 297 /**
 298  * cryp_write_indata - This routine writes 32 bit data into the data input
 299  *                     register of the cryptography IP.
 300  * @device_data: Pointer to the device data struct for base address.
 301  * @write_data: Data to write.
 302  */
 303 int cryp_write_indata(struct cryp_device_data *device_data, u32 write_data);
 304
 305 /**
 306  * cryp_read_outdata - This routine reads the data from the data output
 307  *                     register of the CRYP logic
 308  * @device_data: Pointer to the device data struct for base address.
 309  * @read_data: Read the data from the output FIFO.
 310  */
 311 int cryp_read_outdata(struct cryp_device_data *device_data, u32 *read_data);
 312
 313 #endif /* _CRYP_H_ */