board/lwmon/pcmcia.c

   1 #include <common.h>
   2 #include <mpc8xx.h>
   3 #include <pcmcia.h>
   4 #include <i2c.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 #ifdef  CONFIG_PCMCIA
  17
  18 #define PCMCIA_BOARD_MSG "LWMON"
  19
  20 /* #define's for MAX1604 Power Switch */
  21 #define MAX1604_OP_SUS          0x80
  22 #define MAX1604_VCCBON          0x40
  23 #define MAX1604_VCC_35          0x20
  24 #define MAX1604_VCCBHIZ         0x10
  25 #define MAX1604_VPPBON          0x08
  26 #define MAX1604_VPPBPBPGM       0x04
  27 #define MAX1604_VPPBHIZ         0x02
  28 /* reserved                     0x01    */
  29
  30 int pcmcia_hardware_enable(int slot)
  31 {
  32         volatile immap_t        *immap;
  33         volatile cpm8xx_t       *cp;
  34         volatile pcmconf8xx_t   *pcmp;
  35         volatile sysconf8xx_t   *sysp;
  36         uint reg, mask;
  37         uchar val;
  38
  39
  40         debug ("hardware_enable: " PCMCIA_BOARD_MSG " Slot %c\n", 'A'+slot);
  41
  42         /* Switch on PCMCIA port in PIC register 0x60 */
  43         reg = pic_read  (0x60);
  44         debug ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg);
  45         reg &= ~0x10;
  46         /* reg |= 0x08; Vpp not needed */
  47         pic_write (0x60, reg);
  48 #ifdef DEBUG
  49         reg = pic_read  (0x60);
  50         printf ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg);
  51 #endif
  52         udelay(10000);
  53
  54         immap = (immap_t *)CFG_IMMR;
  55         sysp  = (sysconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_siu_conf));
  56         pcmp  = (pcmconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_pcmcia));
  57         cp    = (cpm8xx_t *)(&(((immap_t *)CFG_IMMR)->im_cpm));
  58
  59         /*
  60          * Configure SIUMCR to enable PCMCIA port B
  61          * (VFLS[0:1] are not used for debugging, we connect FRZ# instead)
  62          */
  63         sysp->sc_siumcr &= ~SIUMCR_DBGC11;      /* set DBGC to 00 */
  64
  65         /* clear interrupt state, and disable interrupts */
  66         pcmp->pcmc_pscr =  PCMCIA_MASK(_slot_);
  67         pcmp->pcmc_per &= ~PCMCIA_MASK(_slot_);
  68
  69         /*
  70          * Disable interrupts, DMA, and PCMCIA buffers
  71          * (isolate the interface) and assert RESET signal
  72          */
  73         debug ("Disable PCMCIA buffers and assert RESET\n");
  74         reg  = 0;
  75         reg |= __MY_PCMCIA_GCRX_CXRESET;        /* active high */
  76         reg |= __MY_PCMCIA_GCRX_CXOE;           /* active low  */
  77         PCMCIA_PGCRX(_slot_) = reg;
  78         udelay(500);
  79
  80         /*
  81          * Make sure there is a card in the slot, then configure the interface.
  82          */
  83         udelay(10000);
  84         debug ("[%d] %s: PIPR(%p)=0x%x\n",
  85                 __LINE__,__FUNCTION__,
  86                 &(pcmp->pcmc_pipr),pcmp->pcmc_pipr);
  87         if (pcmp->pcmc_pipr & (0x18000000 >> (slot << 4))) {
  88                 printf ("   No Card found\n");
  89                 return (1);
  90         }
  91
  92         /*
  93          * Power On.
  94          */
  95         mask = PCMCIA_VS1(slot) | PCMCIA_VS2(slot);
  96         reg  = pcmp->pcmc_pipr;
  97         debug ("PIPR: 0x%x ==> VS1=o%s, VS2=o%s\n",
  98                 reg,
  99                 (reg&PCMCIA_VS1(slot))?"n":"ff",
 100                 (reg&PCMCIA_VS2(slot))?"n":"ff");
 101         if ((reg & mask) == mask) {
 102                 val = 0;                /* VCCB3/5 = 0 ==> use Vx = 5.0 V */
 103                 puts (" 5.0V card found: ");
 104         } else {
 105                 val = MAX1604_VCC_35;   /* VCCB3/5 = 1 ==> use Vy = 3.3 V */
 106                 puts (" 3.3V card found: ");
 107         }
 108
 109         /*  switch VCC on */
 110         val |= MAX1604_OP_SUS | MAX1604_VCCBON;
 111         i2c_init  (CFG_I2C_SPEED, CFG_I2C_SLAVE);
 112         i2c_write (CFG_I2C_POWER_A_ADDR, 0, 0, &val, 1);
 113
 114         udelay(500000);
 115
 116         debug ("Enable PCMCIA buffers and stop RESET\n");
 117         reg  =  PCMCIA_PGCRX(_slot_);
 118         reg &= ~__MY_PCMCIA_GCRX_CXRESET;       /* active high */
 119         reg &= ~__MY_PCMCIA_GCRX_CXOE;          /* active low  */
 120         PCMCIA_PGCRX(_slot_) = reg;
 121
 122         udelay(250000); /* some cards need >150 ms to come up :-( */
 123
 124         debug ("# hardware_enable done\n");
 125
 126         return (0);
 127 }
 128
 129
 130 #if defined(CONFIG_CMD_PCMCIA)
 131 int pcmcia_hardware_disable(int slot)
 132 {
 133         volatile immap_t        *immap;
 134         volatile pcmconf8xx_t   *pcmp;
 135         u_long reg;
 136         uchar val;
 137
 138         debug ("hardware_disable: " PCMCIA_BOARD_MSG " Slot %c\n", 'A'+slot);
 139
 140         immap = (immap_t *)CFG_IMMR;
 141         pcmp = (pcmconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_pcmcia));
 142
 143         /* remove all power, put output in high impedance state */
 144         val  = MAX1604_VCCBHIZ | MAX1604_VPPBHIZ;
 145         i2c_init  (CFG_I2C_SPEED, CFG_I2C_SLAVE);
 146         i2c_write (CFG_I2C_POWER_A_ADDR, 0, 0, &val, 1);
 147
 148         /* Configure PCMCIA General Control Register */
 149         debug ("Disable PCMCIA buffers and assert RESET\n");
 150         reg  = 0;
 151         reg |= __MY_PCMCIA_GCRX_CXRESET;        /* active high */
 152         reg |= __MY_PCMCIA_GCRX_CXOE;           /* active low  */
 153         PCMCIA_PGCRX(_slot_) = reg;
 154
 155         /* Switch off PCMCIA port in PIC register 0x60 */
 156         reg = pic_read  (0x60);
 157         debug ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg);
 158         reg |=  0x10;
 159         reg &= ~0x08;
 160         pic_write (0x60, reg);
 161 #ifdef DEBUG
 162         reg = pic_read  (0x60);
 163         printf ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg);
 164 #endif
 165         udelay(10000);
 166
 167         return (0);
 168 }
 169 #endif
 170
 171
 172 int pcmcia_voltage_set(int slot, int vcc, int vpp)
 173 {
 174         volatile immap_t        *immap;
 175         volatile pcmconf8xx_t   *pcmp;
 176         u_long reg;
 177         uchar val;
 178
 179         debug ("voltage_set: "
 180                 PCMCIA_BOARD_MSG
 181                 " Slot %c, Vcc=%d.%d, Vpp=%d.%d\n",
 182                 'A'+slot, vcc/10, vcc%10, vpp/10, vcc%10);
 183
 184         immap = (immap_t *)CFG_IMMR;
 185         pcmp = (pcmconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_pcmcia));
 186         /*
 187          * Disable PCMCIA buffers (isolate the interface)
 188          * and assert RESET signal
 189          */
 190         debug ("Disable PCMCIA buffers and assert RESET\n");
 191         reg  = PCMCIA_PGCRX(_slot_);
 192         reg |= __MY_PCMCIA_GCRX_CXRESET;        /* active high */
 193         reg |= __MY_PCMCIA_GCRX_CXOE;           /* active low  */
 194         PCMCIA_PGCRX(_slot_) = reg;
 195         udelay(500);
 196
 197         /*
 198          * Turn off all power (switch to high impedance)
 199          */
 200         debug ("PCMCIA power OFF\n");
 201         val  = MAX1604_VCCBHIZ | MAX1604_VPPBHIZ;
 202         i2c_init  (CFG_I2C_SPEED, CFG_I2C_SLAVE);
 203         i2c_write (CFG_I2C_POWER_A_ADDR, 0, 0, &val, 1);
 204
 205         val = 0;
 206         switch(vcc) {
 207         case  0:                        break;
 208         case 33: val = MAX1604_VCC_35;  break;
 209         case 50:                        break;
 210         default:                        goto done;
 211         }
 212
 213         /* Checking supported voltages */
 214
 215         debug ("PIPR: 0x%x --> %s\n",
 216                 pcmp->pcmc_pipr,
 217                 (pcmp->pcmc_pipr & 0x00008000) ? "only 5 V" : "can do 3.3V");
 218
 219         i2c_write (CFG_I2C_POWER_A_ADDR, 0, 0, &val, 1);
 220         if (val) {
 221                 debug ("PCMCIA powered at %sV\n",
 222                         (val & MAX1604_VCC_35) ? "3.3" : "5.0");
 223         } else {
 224                 debug ("PCMCIA powered down\n");
 225         }
 226
 227 done:
 228         debug ("Enable PCMCIA buffers and stop RESET\n");
 229         reg  =  PCMCIA_PGCRX(_slot_);
 230         reg &= ~__MY_PCMCIA_GCRX_CXRESET;       /* active high */
 231         reg &= ~__MY_PCMCIA_GCRX_CXOE;          /* active low  */
 232         PCMCIA_PGCRX(_slot_) = reg;
 233         udelay(500);
 234
 235         debug ("voltage_set: " PCMCIA_BOARD_MSG " Slot %c, DONE\n",
 236                 slot+'A');
 237         return (0);
 238 }
 239
 240 #endif  /* CONFIG_PCMCIA */