diff options
Diffstat (limited to 'board/lwmon/pcmcia.c')
-rw-r--r-- | board/lwmon/pcmcia.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/board/lwmon/pcmcia.c b/board/lwmon/pcmcia.c new file mode 100644 index 00000000000..2349286bb25 --- /dev/null +++ b/board/lwmon/pcmcia.c @@ -0,0 +1,240 @@ +#include <common.h> +#include <mpc8xx.h> +#include <pcmcia.h> +#include <i2c.h> + +#undef CONFIG_PCMCIA + +#if (CONFIG_COMMANDS & CFG_CMD_PCMCIA) +#define CONFIG_PCMCIA +#endif + +#if (CONFIG_COMMANDS & CFG_CMD_IDE) && defined(CONFIG_IDE_8xx_PCCARD) +#define CONFIG_PCMCIA +#endif + +#ifdef CONFIG_PCMCIA + +#define PCMCIA_BOARD_MSG "LWMON" + +/* #define's for MAX1604 Power Switch */ +#define MAX1604_OP_SUS 0x80 +#define MAX1604_VCCBON 0x40 +#define MAX1604_VCC_35 0x20 +#define MAX1604_VCCBHIZ 0x10 +#define MAX1604_VPPBON 0x08 +#define MAX1604_VPPBPBPGM 0x04 +#define MAX1604_VPPBHIZ 0x02 +/* reserved 0x01 */ + +int pcmcia_hardware_enable(int slot) +{ + volatile immap_t *immap; + volatile cpm8xx_t *cp; + volatile pcmconf8xx_t *pcmp; + volatile sysconf8xx_t *sysp; + uint reg, mask; + uchar val; + + + debug ("hardware_enable: " PCMCIA_BOARD_MSG " Slot %c\n", 'A'+slot); + + /* Switch on PCMCIA port in PIC register 0x60 */ + reg = pic_read (0x60); + debug ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg); + reg &= ~0x10; + /* reg |= 0x08; Vpp not needed */ + pic_write (0x60, reg); +#ifdef DEBUG + reg = pic_read (0x60); + printf ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg); +#endif + udelay(10000); + + immap = (immap_t *)CFG_IMMR; + sysp = (sysconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_siu_conf)); + pcmp = (pcmconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_pcmcia)); + cp = (cpm8xx_t *)(&(((immap_t *)CFG_IMMR)->im_cpm)); + + /* + * Configure SIUMCR to enable PCMCIA port B + * (VFLS[0:1] are not used for debugging, we connect FRZ# instead) + */ + sysp->sc_siumcr &= ~SIUMCR_DBGC11; /* set DBGC to 00 */ + + /* clear interrupt state, and disable interrupts */ + pcmp->pcmc_pscr = PCMCIA_MASK(_slot_); + pcmp->pcmc_per &= ~PCMCIA_MASK(_slot_); + + /* + * Disable interrupts, DMA, and PCMCIA buffers + * (isolate the interface) and assert RESET signal + */ + debug ("Disable PCMCIA buffers and assert RESET\n"); + reg = 0; + reg |= __MY_PCMCIA_GCRX_CXRESET; /* active high */ + reg |= __MY_PCMCIA_GCRX_CXOE; /* active low */ + PCMCIA_PGCRX(_slot_) = reg; + udelay(500); + + /* + * Make sure there is a card in the slot, then configure the interface. + */ + udelay(10000); + debug ("[%d] %s: PIPR(%p)=0x%x\n", + __LINE__,__FUNCTION__, + &(pcmp->pcmc_pipr),pcmp->pcmc_pipr); + if (pcmp->pcmc_pipr & (0x18000000 >> (slot << 4))) { + printf (" No Card found\n"); + return (1); + } + + /* + * Power On. + */ + mask = PCMCIA_VS1(slot) | PCMCIA_VS2(slot); + reg = pcmp->pcmc_pipr; + debug ("PIPR: 0x%x ==> VS1=o%s, VS2=o%s\n", + reg, + (reg&PCMCIA_VS1(slot))?"n":"ff", + (reg&PCMCIA_VS2(slot))?"n":"ff"); + if ((reg & mask) == mask) { + val = 0; /* VCCB3/5 = 0 ==> use Vx = 5.0 V */ + puts (" 5.0V card found: "); + } else { + val = MAX1604_VCC_35; /* VCCB3/5 = 1 ==> use Vy = 3.3 V */ + puts (" 3.3V card found: "); + } + + /* switch VCC on */ + val |= MAX1604_OP_SUS | MAX1604_VCCBON; + i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE); + i2c_write (CFG_I2C_POWER_A_ADDR, 0, 0, &val, 1); + + udelay(500000); + + debug ("Enable PCMCIA buffers and stop RESET\n"); + reg = PCMCIA_PGCRX(_slot_); + reg &= ~__MY_PCMCIA_GCRX_CXRESET; /* active high */ + reg &= ~__MY_PCMCIA_GCRX_CXOE; /* active low */ + PCMCIA_PGCRX(_slot_) = reg; + + udelay(250000); /* some cards need >150 ms to come up :-( */ + + debug ("# hardware_enable done\n"); + + return (0); +} + + +#if (CONFIG_COMMANDS & CFG_CMD_PCMCIA) +int pcmcia_hardware_disable(int slot) +{ + volatile immap_t *immap; + volatile pcmconf8xx_t *pcmp; + u_long reg; + uchar val; + + debug ("hardware_disable: " PCMCIA_BOARD_MSG " Slot %c\n", 'A'+slot); + + immap = (immap_t *)CFG_IMMR; + pcmp = (pcmconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_pcmcia)); + + /* remove all power, put output in high impedance state */ + val = MAX1604_VCCBHIZ | MAX1604_VPPBHIZ; + i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE); + i2c_write (CFG_I2C_POWER_A_ADDR, 0, 0, &val, 1); + + /* Configure PCMCIA General Control Register */ + debug ("Disable PCMCIA buffers and assert RESET\n"); + reg = 0; + reg |= __MY_PCMCIA_GCRX_CXRESET; /* active high */ + reg |= __MY_PCMCIA_GCRX_CXOE; /* active low */ + PCMCIA_PGCRX(_slot_) = reg; + + /* Switch off PCMCIA port in PIC register 0x60 */ + reg = pic_read (0x60); + debug ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg); + reg |= 0x10; + reg &= ~0x08; + pic_write (0x60, reg); +#ifdef DEBUG + reg = pic_read (0x60); + printf ("[%d] PIC read: reg_60 = 0x%02x\n", __LINE__, reg); +#endif + udelay(10000); + + return (0); +} +#endif /* CFG_CMD_PCMCIA */ + + +int pcmcia_voltage_set(int slot, int vcc, int vpp) +{ + volatile immap_t *immap; + volatile pcmconf8xx_t *pcmp; + u_long reg; + uchar val; + + debug ("voltage_set: " + PCMCIA_BOARD_MSG + " Slot %c, Vcc=%d.%d, Vpp=%d.%d\n", + 'A'+slot, vcc/10, vcc%10, vpp/10, vcc%10); + + immap = (immap_t *)CFG_IMMR; + pcmp = (pcmconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_pcmcia)); + /* + * Disable PCMCIA buffers (isolate the interface) + * and assert RESET signal + */ + debug ("Disable PCMCIA buffers and assert RESET\n"); + reg = PCMCIA_PGCRX(_slot_); + reg |= __MY_PCMCIA_GCRX_CXRESET; /* active high */ + reg |= __MY_PCMCIA_GCRX_CXOE; /* active low */ + PCMCIA_PGCRX(_slot_) = reg; + udelay(500); + + /* + * Turn off all power (switch to high impedance) + */ + debug ("PCMCIA power OFF\n"); + val = MAX1604_VCCBHIZ | MAX1604_VPPBHIZ; + i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE); + i2c_write (CFG_I2C_POWER_A_ADDR, 0, 0, &val, 1); + + val = 0; + switch(vcc) { + case 0: break; + case 33: val = MAX1604_VCC_35; break; + case 50: break; + default: goto done; + } + + /* Checking supported voltages */ + + debug ("PIPR: 0x%x --> %s\n", + pcmp->pcmc_pipr, + (pcmp->pcmc_pipr & 0x00008000) ? "only 5 V" : "can do 3.3V"); + + i2c_write (CFG_I2C_POWER_A_ADDR, 0, 0, &val, 1); + if (val) { + debug ("PCMCIA powered at %sV\n", + (val & MAX1604_VCC_35) ? "3.3" : "5.0"); + } else { + debug ("PCMCIA powered down\n"); + } + +done: + debug ("Enable PCMCIA buffers and stop RESET\n"); + reg = PCMCIA_PGCRX(_slot_); + reg &= ~__MY_PCMCIA_GCRX_CXRESET; /* active high */ + reg &= ~__MY_PCMCIA_GCRX_CXOE; /* active low */ + PCMCIA_PGCRX(_slot_) = reg; + udelay(500); + + debug ("voltage_set: " PCMCIA_BOARD_MSG " Slot %c, DONE\n", + slot+'A'); + return (0); +} + +#endif /* CONFIG_PCMCIA */ |