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 pcmconf8xx_t   *pcmp;
  33         volatile sysconf8xx_t   *sysp;
  34         uint reg, mask;
  35         uchar val;
  36
  37
  38         debug ("hardware_enable: " PCMCIA_BOARD_MSG " Slot %c\n", 'A'+slot);
  39
  40         /* Switch on PCMCIA port in PIC register 0x60 */
  41         reg = pic_read  (0x60);
  42         debug ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg);
  43         reg &= ~0x10;
  44         /* reg |= 0x08; Vpp not needed */
  45         pic_write (0x60, reg);
  46 #ifdef DEBUG
  47         reg = pic_read  (0x60);
  48         printf ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg);
  49 #endif
  50         udelay(10000);
  51
  52         sysp  = (sysconf8xx_t *)(&(((immap_t *)CONFIG_SYS_IMMR)->im_siu_conf));
  53         pcmp  = (pcmconf8xx_t *)(&(((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia));
  54
  55         /*
  56          * Configure SIUMCR to enable PCMCIA port B
  57          * (VFLS[0:1] are not used for debugging, we connect FRZ# instead)
  58          */
  59         sysp->sc_siumcr &= ~SIUMCR_DBGC11;      /* set DBGC to 00 */
  60
  61         /* clear interrupt state, and disable interrupts */
  62         pcmp->pcmc_pscr =  PCMCIA_MASK(_slot_);
  63         pcmp->pcmc_per &= ~PCMCIA_MASK(_slot_);
  64
  65         /*
  66          * Disable interrupts, DMA, and PCMCIA buffers
  67          * (isolate the interface) and assert RESET signal
  68          */
  69         debug ("Disable PCMCIA buffers and assert RESET\n");
  70         reg  = 0;
  71         reg |= __MY_PCMCIA_GCRX_CXRESET;        /* active high */
  72         reg |= __MY_PCMCIA_GCRX_CXOE;           /* active low  */
  73         PCMCIA_PGCRX(_slot_) = reg;
  74         udelay(500);
  75
  76         /*
  77          * Make sure there is a card in the slot, then configure the interface.
  78          */
  79         udelay(10000);
  80         debug ("[%d] %s: PIPR(%p)=0x%x\n",
  81                 __LINE__,__FUNCTION__,
  82                 &(pcmp->pcmc_pipr),pcmp->pcmc_pipr);
  83         if (pcmp->pcmc_pipr & (0x18000000 >> (slot << 4))) {
  84                 printf ("   No Card found\n");
  85                 return (1);
  86         }
  87
  88         /*
  89          * Power On.
  90          */
  91         mask = PCMCIA_VS1(slot) | PCMCIA_VS2(slot);
  92         reg  = pcmp->pcmc_pipr;
  93         debug ("PIPR: 0x%x ==> VS1=o%s, VS2=o%s\n",
  94                 reg,
  95                 (reg&PCMCIA_VS1(slot))?"n":"ff",
  96                 (reg&PCMCIA_VS2(slot))?"n":"ff");
  97         if ((reg & mask) == mask) {
  98                 val = 0;                /* VCCB3/5 = 0 ==> use Vx = 5.0 V */
  99                 puts (" 5.0V card found: ");
 100         } else {
 101                 val = MAX1604_VCC_35;   /* VCCB3/5 = 1 ==> use Vy = 3.3 V */
 102                 puts (" 3.3V card found: ");
 103         }
 104
 105         /*  switch VCC on */
 106         val |= MAX1604_OP_SUS | MAX1604_VCCBON;
 107         i2c_set_bus_num(0);
 108         i2c_write (CONFIG_SYS_I2C_POWER_A_ADDR, 0, 0, &val, 1);
 109
 110         udelay(500000);
 111
 112         debug ("Enable PCMCIA buffers and stop RESET\n");
 113         reg  =  PCMCIA_PGCRX(_slot_);
 114         reg &= ~__MY_PCMCIA_GCRX_CXRESET;       /* active high */
 115         reg &= ~__MY_PCMCIA_GCRX_CXOE;          /* active low  */
 116         PCMCIA_PGCRX(_slot_) = reg;
 117
 118         udelay(250000); /* some cards need >150 ms to come up :-( */
 119
 120         debug ("# hardware_enable done\n");
 121
 122         return (0);
 123 }
 124
 125
 126 #if defined(CONFIG_CMD_PCMCIA)
 127 int pcmcia_hardware_disable(int slot)
 128 {
 129         volatile immap_t        *immap;
 130         volatile pcmconf8xx_t   *pcmp;
 131         u_long reg;
 132         uchar val;
 133
 134         debug ("hardware_disable: " PCMCIA_BOARD_MSG " Slot %c\n", 'A'+slot);
 135
 136         immap = (immap_t *)CONFIG_SYS_IMMR;
 137         pcmp = (pcmconf8xx_t *)(&(((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia));
 138
 139         /* remove all power, put output in high impedance state */
 140         val  = MAX1604_VCCBHIZ | MAX1604_VPPBHIZ;
 141         i2c_init  (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 142         i2c_write (CONFIG_SYS_I2C_POWER_A_ADDR, 0, 0, &val, 1);
 143
 144         /* Configure PCMCIA General Control Register */
 145         debug ("Disable PCMCIA buffers and assert RESET\n");
 146         reg  = 0;
 147         reg |= __MY_PCMCIA_GCRX_CXRESET;        /* active high */
 148         reg |= __MY_PCMCIA_GCRX_CXOE;           /* active low  */
 149         PCMCIA_PGCRX(_slot_) = reg;
 150
 151         /* Switch off PCMCIA port in PIC register 0x60 */
 152         reg = pic_read  (0x60);
 153         debug ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg);
 154         reg |=  0x10;
 155         reg &= ~0x08;
 156         pic_write (0x60, reg);
 157 #ifdef DEBUG
 158         reg = pic_read  (0x60);
 159         printf ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg);
 160 #endif
 161         udelay(10000);
 162
 163         return (0);
 164 }
 165 #endif
 166
 167
 168 int pcmcia_voltage_set(int slot, int vcc, int vpp)
 169 {
 170         volatile pcmconf8xx_t   *pcmp;
 171         u_long reg;
 172         uchar val;
 173
 174         debug ("voltage_set: "
 175                 PCMCIA_BOARD_MSG
 176                 " Slot %c, Vcc=%d.%d, Vpp=%d.%d\n",
 177                 'A'+slot, vcc/10, vcc%10, vpp/10, vcc%10);
 178
 179         pcmp = (pcmconf8xx_t *)(&(((immap_t *)CONFIG_SYS_IMMR)->im_pcmcia));
 180         /*
 181          * Disable PCMCIA buffers (isolate the interface)
 182          * and assert RESET signal
 183          */
 184         debug ("Disable PCMCIA buffers and assert RESET\n");
 185         reg  = PCMCIA_PGCRX(_slot_);
 186         reg |= __MY_PCMCIA_GCRX_CXRESET;        /* active high */
 187         reg |= __MY_PCMCIA_GCRX_CXOE;           /* active low  */
 188         PCMCIA_PGCRX(_slot_) = reg;
 189         udelay(500);
 190
 191         /*
 192          * Turn off all power (switch to high impedance)
 193          */
 194         debug ("PCMCIA power OFF\n");
 195         val  = MAX1604_VCCBHIZ | MAX1604_VPPBHIZ;
 196         i2c_set_bus_num(0);
 197         i2c_write (CONFIG_SYS_I2C_POWER_A_ADDR, 0, 0, &val, 1);
 198
 199         val = 0;
 200         switch(vcc) {
 201         case  0:                        break;
 202         case 33: val = MAX1604_VCC_35;  break;
 203         case 50:                        break;
 204         default:                        goto done;
 205         }
 206
 207         /* Checking supported voltages */
 208
 209         debug ("PIPR: 0x%x --> %s\n",
 210                 pcmp->pcmc_pipr,
 211                 (pcmp->pcmc_pipr & 0x00008000) ? "only 5 V" : "can do 3.3V");
 212
 213         i2c_write (CONFIG_SYS_I2C_POWER_A_ADDR, 0, 0, &val, 1);
 214         if (val) {
 215                 debug ("PCMCIA powered at %sV\n",
 216                         (val & MAX1604_VCC_35) ? "3.3" : "5.0");
 217         } else {
 218                 debug ("PCMCIA powered down\n");
 219         }
 220
 221 done:
 222         debug ("Enable PCMCIA buffers and stop RESET\n");
 223         reg  =  PCMCIA_PGCRX(_slot_);
 224         reg &= ~__MY_PCMCIA_GCRX_CXRESET;       /* active high */
 225         reg &= ~__MY_PCMCIA_GCRX_CXOE;          /* active low  */
 226         PCMCIA_PGCRX(_slot_) = reg;
 227         udelay(500);
 228
 229         debug ("voltage_set: " PCMCIA_BOARD_MSG " Slot %c, DONE\n",
 230                 slot+'A');
 231         return (0);
 232 }
 233
 234 #endif  /* CONFIG_PCMCIA */