i386/linux/linux-2.3.21/drivers/net/fc/iph5526_novram.c

   1 /**********************************************************************
   2  * Reading the NVRAM on the Interphase 5526 PCI Fibre Channel Card.
   3  * All contents in this file : courtesy Interphase Corporation.
   4  * Special thanks to Kevin Quick, kquick@iphase.com.
   5  **********************************************************************/
   6
   7 #define FF_MAGIC        0x4646
   8 #define DB_MAGIC        0x4442
   9 #define DL_MAGIC        0x444d
  10
  11
  12 #define CMD_LEN         9
  13
  14 /***********
  15  *
  16  *      Switches and defines for header files.
  17  *
  18  *      The following defines are used to turn on and off
  19  *      various options in the header files. Primarily useful
  20  *      for debugging.
  21  *
  22  ***********/
  23
  24 static const unsigned short novram_default[4] = {
  25     FF_MAGIC,
  26     DB_MAGIC,
  27     DL_MAGIC,
  28     0 };
  29
  30
  31 /*
  32  * a list of the commands that can be sent to the NOVRAM
  33  */
  34
  35 #define NR_EXTEND  0x100
  36 #define NR_WRITE   0x140
  37 #define NR_READ    0x180
  38 #define NR_ERASE   0x1c0
  39
  40 #define EWDS    0x00
  41 #define WRAL    0x10
  42 #define ERAL    0x20
  43 #define EWEN    0x30
  44
  45 /*
  46  * Defines for the pins on the NOVRAM
  47  */
  48
  49 #define BIT(x)          (1 << (x))
  50
  51 #define NVDI_B          31
  52 #define NVDI            BIT(NVDI_B)
  53 #define NVDO            BIT(9)
  54 #define NVCE            BIT(30)
  55 #define NVSK            BIT(29)
  56 #define NV_MANUAL       BIT(28)
  57
  58 /***********
  59  *
  60  *      Include files.
  61  *
  62  ***********/
  63
  64 #define KeStallExecutionProcessor(x)    {volatile int d, p;\
  65                   for (d=0; d<x; d++) for (p=0; p<10; p++);\
  66                                      }
  67
  68
  69 /***********************
  70  *
  71  * This define ands the value and the current config register and puts
  72  * the result in the config register
  73  *
  74  ***********************/
  75
  76 #define CFG_AND(val) { volatile int t; \
  77                            t = readl(fi->n_r.ptr_novram_hw_control_reg);   \
  78                            t &= (val);                                  \
  79                            writel(t, fi->n_r.ptr_novram_hw_control_reg);   \
  80                    }
  81
  82 /***********************
  83  *
  84  * This define ors the value and the current config register and puts
  85  * the result in the config register
  86  *
  87  ***********************/
  88
  89 #define CFG_OR(val) { volatile int t; \
  90                            t = readl(fi->n_r.ptr_novram_hw_control_reg);   \
  91                            t |= (val);                                  \
  92                            writel(t, fi->n_r.ptr_novram_hw_control_reg);   \
  93                    }
  94
  95 /***********************
  96  *
  97  * Send a command to the NOVRAM, the command is in cmd.
  98  *
  99  * clear CE and SK. Then assert CE.
 100  * Clock each of the command bits out in the correct order with SK
 101  * exit with CE still asserted
 102  *
 103  ***********************/
 104
 105 #define NVRAM_CMD(cmd) { int i; \
 106                          int c = cmd; \
 107                          CFG_AND(~(NVCE|NVSK)); \
 108                          CFG_OR(NVCE); \
 109                          for (i=0; i<CMD_LEN; i++) { \
 110                              NVRAM_CLKOUT((c & (1 << (CMD_LEN - 1))) ? 1 : 0);\
 111                              c <<= 1; } }
 112
 113 /***********************
 114  *
 115  * clear the CE, this must be used after each command is complete
 116  *
 117  ***********************/
 118
 119 #define NVRAM_CLR_CE    CFG_AND(~NVCE)
 120
 121 /***********************
 122  *
 123  * clock the data bit in bitval out to the NOVRAM.  The bitval must be
 124  * a 1 or 0, or the clockout operation is undefined
 125  *
 126  ***********************/
 127
 128 #define NVRAM_CLKOUT(bitval) {\
 129                            CFG_AND(~NVDI); \
 130                            CFG_OR((bitval) << NVDI_B); \
 131                            KeStallExecutionProcessor(5);\
 132                            CFG_OR(NVSK); \
 133                            KeStallExecutionProcessor(5);\
 134                            CFG_AND( ~NVSK); \
 135                            }
 136
 137 /***********************
 138  *
 139  * clock the data bit in and return a 1 or 0, depending on the value
 140  * that was received from the NOVRAM
 141  *
 142  ***********************/
 143
 144 #define NVRAM_CLKIN(val)        {\
 145                        CFG_OR(NVSK); \
 146                            KeStallExecutionProcessor(5);\
 147                        CFG_AND(~NVSK); \
 148                            KeStallExecutionProcessor(5);\
 149                        val = (readl(fi->n_r.ptr_novram_hw_status_reg) & NVDO) ? 1 : 0; \
 150                        }
 151
 152 /***********
 153  *
 154  *      Function Prototypes
 155  *
 156  ***********/
 157
 158 static int iph5526_nr_get(struct fc_info *fi, int addr);
 159 static void iph5526_nr_do_init(struct fc_info *fi);
 160 static void iph5526_nr_checksum(struct fc_info *fi);
 161
 162
 163 /*******************************************************************
 164  *
 165  *      Local routine:  iph5526_nr_do_init
 166  *      Purpose:        initialize novram server
 167  *      Description:
 168  *
 169  *      iph5526_nr_do_init reads the novram into the temporary holding place.
 170  *      A checksum is done on the area and the Magic Cookies are checked.
 171  *      If any of them are bad, the NOVRAM is initialized with the
 172  *      default values and a warning message is displayed.
 173  *
 174  *******************************************************************/
 175
 176 static void iph5526_nr_do_init(struct fc_info *fi)
 177 {
 178     int i;
 179     unsigned short chksum = 0;
 180     int bad = 0;
 181
 182     for (i=0; i<IPH5526_NOVRAM_SIZE; i++) {
 183         fi->n_r.data[i] = iph5526_nr_get(fi, i);
 184         chksum += fi->n_r.data[i];
 185     }
 186
 187     if (chksum)
 188         bad = 1;
 189
 190     if (fi->n_r.data[IPH5526_NOVRAM_SIZE - 4] != FF_MAGIC)
 191         bad = 1;
 192     if (fi->n_r.data[IPH5526_NOVRAM_SIZE - 3] != DB_MAGIC)
 193         bad = 1;
 194         if (fi->n_r.data[IPH5526_NOVRAM_SIZE - 2] != DL_MAGIC)
 195         bad = 1;
 196
 197     if (bad) {
 198         for (i=0; i<IPH5526_NOVRAM_SIZE; i++) {
 199             if (i < (IPH5526_NOVRAM_SIZE - 4)) {
 200                 fi->n_r.data[i] = 0xffff;
 201             } else {
 202                 fi->n_r.data[i] = novram_default[i - (IPH5526_NOVRAM_SIZE - 4)];
 203             }
 204         }
 205         iph5526_nr_checksum(fi);
 206     }
 207 }
 208
 209
 210 /*******************************************************************
 211  *
 212  *      Local routine:  iph5526_nr_get
 213  *      Purpose:        read a single word of NOVRAM
 214  *      Description:
 215  *
 216  *      read the 16 bits that make up a word addr of the novram.
 217  *      The 16 bits of data that are read are returned as the return value
 218  *
 219  *******************************************************************/
 220
 221 static int iph5526_nr_get(struct fc_info *fi, int addr)
 222 {
 223     int i;
 224     int t;
 225     int val = 0;
 226
 227     CFG_OR(NV_MANUAL);
 228
 229     /*
 230      * read the first bit that was clocked with the falling edge of the
 231      * the last command data clock
 232      */
 233
 234     NVRAM_CMD(NR_READ + addr);
 235
 236     /*
 237      * Now read the rest of the bits, the next bit read is D1, then D2,
 238      * and so on
 239      */
 240
 241     val = 0;
 242     for (i=0; i<16; i++) {
 243         NVRAM_CLKIN(t);
 244         val <<= 1;
 245         val |= t;
 246     }
 247     NVRAM_CLR_CE;
 248
 249     CFG_OR(NVDI);
 250     CFG_AND(~NV_MANUAL);
 251
 252     return(val);
 253 }
 254
 255
 256
 257
 258 /*******************************************************************
 259  *
 260  *      Local routine:  iph5526_nr_checksum
 261  *      Purpose:        calculate novram checksum on fi->n_r.data
 262  *      Description:
 263  *
 264  *      calculate a checksum for the novram on the image that is
 265  *      currently in fi->n_r.data
 266  *
 267  *******************************************************************/
 268
 269 static void iph5526_nr_checksum(struct fc_info *fi)
 270 {
 271     int i;
 272     unsigned short chksum = 0;
 273
 274     for (i=0; i<(IPH5526_NOVRAM_SIZE - 1); i++)
 275         chksum += fi->n_r.data[i];
 276
 277     fi->n_r.data[i] = -chksum;
 278 }