drivers/pcmcia/mpc8xx_pcmcia.c

   1 #include <common.h>
   2 #include <mpc8xx.h>
   3 #include <pcmcia.h>
   4 #include <linux/compiler.h>
   5
   6 #undef  CONFIG_PCMCIA
   7
   8 #if defined(CONFIG_CMD_PCMCIA)
   9 #define CONFIG_PCMCIA
  10 #endif
  11
  12 #if defined(CONFIG_CMD_IDE) && defined(CONFIG_IDE_8xx_PCCARD)
  13 #define CONFIG_PCMCIA
  14 #endif
  15
  16 #if defined(CONFIG_PCMCIA)
  17
  18 #if     defined(CONFIG_IDE_8xx_PCCARD)
  19 extern int check_ide_device (int slot);
  20 #endif
  21
  22 extern int pcmcia_hardware_enable (int slot);
  23 extern int pcmcia_voltage_set(int slot, int vcc, int vpp);
  24
  25 #if defined(CONFIG_CMD_PCMCIA)
  26 extern int pcmcia_hardware_disable(int slot);
  27 #endif
  28
  29 static u_int m8xx_get_graycode(u_int size);
  30 #if 0 /* Disabled */
  31 static u_int m8xx_get_speed(u_int ns, u_int is_io);
  32 #endif
  33
  34 /* look up table for pgcrx registers */
  35 u_int *pcmcia_pgcrx[2] = {
  36         &((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia.pcmc_pgcra,
  37         &((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia.pcmc_pgcrb,
  38 };
  39
  40 /*
  41  * Search this table to see if the windowsize is
  42  * supported...
  43  */
  44
  45 #define M8XX_SIZES_NO 32
  46
  47 static const u_int m8xx_size_to_gray[M8XX_SIZES_NO] =
  48 { 0x00000001, 0x00000002, 0x00000008, 0x00000004,
  49   0x00000080, 0x00000040, 0x00000010, 0x00000020,
  50   0x00008000, 0x00004000, 0x00001000, 0x00002000,
  51   0x00000100, 0x00000200, 0x00000800, 0x00000400,
  52
  53   0x0fffffff, 0xffffffff, 0xffffffff, 0xffffffff,
  54   0x01000000, 0x02000000, 0xffffffff, 0x04000000,
  55   0x00010000, 0x00020000, 0x00080000, 0x00040000,
  56   0x00800000, 0x00400000, 0x00100000, 0x00200000 };
  57
  58
  59 /* -------------------------------------------------------------------- */
  60
  61 #if     defined(CONFIG_LWMON) || defined(CONFIG_NSCU)
  62 #define CONFIG_SYS_PCMCIA_TIMING        (       PCMCIA_SHT(9)   \
  63                                 |       PCMCIA_SST(3)   \
  64                                 |       PCMCIA_SL(12))
  65 #else
  66 #define CONFIG_SYS_PCMCIA_TIMING        (       PCMCIA_SHT(2)   \
  67                                 |       PCMCIA_SST(4)   \
  68                                 |       PCMCIA_SL(9))
  69 #endif
  70
  71 /* -------------------------------------------------------------------- */
  72
  73 int pcmcia_on (void)
  74 {
  75         u_long reg, base;
  76         pcmcia_win_t *win;
  77         u_int rc, slot;
  78         __maybe_unused u_int slotbit;
  79         int i;
  80
  81         debug ("Enable PCMCIA " PCMCIA_SLOT_MSG "\n");
  82
  83         /* intialize the fixed memory windows */
  84         win = (pcmcia_win_t *)(&((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia.pcmc_pbr0);
  85         base = CONFIG_SYS_PCMCIA_MEM_ADDR;
  86
  87         if((reg = m8xx_get_graycode(CONFIG_SYS_PCMCIA_MEM_SIZE)) == -1) {
  88                 printf ("Cannot set window size to 0x%08x\n",
  89                         CONFIG_SYS_PCMCIA_MEM_SIZE);
  90                 return (1);
  91         }
  92
  93         slotbit = PCMCIA_SLOT_x;
  94         for (i=0; i<PCMCIA_MEM_WIN_NO; ++i) {
  95                 win->br = base;
  96
  97 #if     (PCMCIA_SOCKETS_NO == 2)
  98                 if (i == 4) /* Another slot starting from win 4 */
  99                         slotbit = (slotbit ? PCMCIA_PSLOT_A : PCMCIA_PSLOT_B);
 100 #endif
 101                 switch (i) {
 102 #ifdef  CONFIG_IDE_8xx_PCCARD
 103                 case 4:
 104                 case 0: {       /* map attribute memory */
 105                         win->or = (     PCMCIA_BSIZE_64M
 106                                 |       PCMCIA_PPS_8
 107                                 |       PCMCIA_PRS_ATTR
 108                                 |       slotbit
 109                                 |       PCMCIA_PV
 110                                 |       CONFIG_SYS_PCMCIA_TIMING );
 111                         break;
 112                 }
 113                 case 5:
 114                 case 1: {       /* map I/O window for data reg */
 115                         win->or = (     PCMCIA_BSIZE_1K
 116                                 |       PCMCIA_PPS_16
 117                                 |       PCMCIA_PRS_IO
 118                                 |       slotbit
 119                                 |       PCMCIA_PV
 120                                 |       CONFIG_SYS_PCMCIA_TIMING );
 121                         break;
 122                 }
 123                 case 6:
 124                 case 2: {       /* map I/O window for cmd/ctrl reg block */
 125                         win->or = (     PCMCIA_BSIZE_1K
 126                                 |       PCMCIA_PPS_8
 127                                 |       PCMCIA_PRS_IO
 128                                 |       slotbit
 129                                 |       PCMCIA_PV
 130                                 |       CONFIG_SYS_PCMCIA_TIMING );
 131                         break;
 132                 }
 133 #endif  /* CONFIG_IDE_8xx_PCCARD */
 134                 default:        /* set to not valid */
 135                         win->or = 0;
 136                         break;
 137                 }
 138
 139                 debug ("MemWin %d: PBR 0x%08lX  POR %08lX\n",
 140                        i, win->br, win->or);
 141                 base += CONFIG_SYS_PCMCIA_MEM_SIZE;
 142                 ++win;
 143         }
 144
 145         for (i=0, rc=0, slot=_slot_; i<PCMCIA_SOCKETS_NO; i++, slot = !slot) {
 146                 /* turn off voltage */
 147                 if ((rc = pcmcia_voltage_set(slot, 0, 0)))
 148                         continue;
 149
 150                 /* Enable external hardware */
 151                 if ((rc = pcmcia_hardware_enable(slot)))
 152                         continue;
 153
 154 #ifdef  CONFIG_IDE_8xx_PCCARD
 155                 if ((rc = check_ide_device(i)))
 156                         continue;
 157 #endif
 158         }
 159         return rc;
 160 }
 161
 162 #if defined(CONFIG_CMD_PCMCIA)
 163 int pcmcia_off (void)
 164 {
 165         int i;
 166         pcmcia_win_t *win;
 167
 168         printf ("Disable PCMCIA " PCMCIA_SLOT_MSG "\n");
 169
 170         /* clear interrupt state, and disable interrupts */
 171         ((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia.pcmc_pscr =  PCMCIA_MASK(_slot_);
 172         ((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia.pcmc_per &= ~PCMCIA_MASK(_slot_);
 173
 174         /* turn off interrupt and disable CxOE */
 175         PCMCIA_PGCRX(_slot_) = __MY_PCMCIA_GCRX_CXOE;
 176
 177         /* turn off memory windows */
 178         win = (pcmcia_win_t *)(&((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia.pcmc_pbr0);
 179
 180         for (i=0; i<PCMCIA_MEM_WIN_NO; ++i) {
 181                 /* disable memory window */
 182                 win->or = 0;
 183                 ++win;
 184         }
 185
 186         /* turn off voltage */
 187         pcmcia_voltage_set(_slot_, 0, 0);
 188
 189         /* disable external hardware */
 190         printf ("Shutdown and Poweroff " PCMCIA_SLOT_MSG "\n");
 191         pcmcia_hardware_disable(_slot_);
 192         return 0;
 193 }
 194 #endif
 195
 196
 197 static u_int m8xx_get_graycode(u_int size)
 198 {
 199         u_int k;
 200
 201         for (k = 0; k < M8XX_SIZES_NO; k++) {
 202                 if(m8xx_size_to_gray[k] == size)
 203                         break;
 204         }
 205
 206         if((k == M8XX_SIZES_NO) || (m8xx_size_to_gray[k] == -1))
 207                 k = -1;
 208
 209         return k;
 210 }
 211
 212 #if     0
 213
 214 #if     defined(CONFIG_RPXCLASSIC) || defined(CONFIG_RPXLITE)
 215
 216 /* The RPX boards seems to have it's bus monitor timeout set to 6*8 clocks.
 217  * SYPCR is write once only, therefore must the slowest memory be faster
 218  * than the bus monitor or we will get a machine check due to the bus timeout.
 219  */
 220 #undef  PCMCIA_BMT_LIMIT
 221 #define PCMCIA_BMT_LIMIT (6*8)
 222 #endif
 223
 224 static u_int m8xx_get_speed(u_int ns, u_int is_io)
 225 {
 226         u_int reg, clocks, psst, psl, psht;
 227
 228         if(!ns) {
 229
 230                 /*
 231                 * We get called with IO maps setup to 0ns
 232                 * if not specified by the user.
 233                 * They should be 255ns.
 234                 */
 235
 236                 if(is_io)
 237                         ns = 255;
 238                 else
 239                         ns = 100;  /* fast memory if 0 */
 240         }
 241
 242         /*
 243         * In PSST, PSL, PSHT fields we tell the controller
 244         * timing parameters in CLKOUT clock cycles.
 245         * CLKOUT is the same as GCLK2_50.
 246         */
 247
 248         /* how we want to adjust the timing - in percent */
 249
 250 #define ADJ 180 /* 80 % longer accesstime - to be sure */
 251
 252         clocks = ((M8XX_BUSFREQ / 1000) * ns) / 1000;
 253         clocks = (clocks * ADJ) / (100*1000);
 254
 255         if(clocks >= PCMCIA_BMT_LIMIT) {
 256                 DEBUG(0, "Max access time limit reached\n");
 257                 clocks = PCMCIA_BMT_LIMIT-1;
 258         }
 259
 260         psst = clocks / 7;          /* setup time */
 261         psht = clocks / 7;          /* hold time */
 262         psl  = (clocks * 5) / 7;    /* strobe length */
 263
 264         psst += clocks - (psst + psht + psl);
 265
 266         reg =  psst << 12;
 267         reg |= psl  << 7;
 268         reg |= psht << 16;
 269
 270         return reg;
 271 }
 272 #endif  /* 0 */
 273
 274 #endif  /* CONFIG_PCMCIA */