pcmcia.c

UBOOT 源码

#include <common.h>
#include <mpc8xx.h>
#include <pcmcia.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 "KUP"

#define KUP4K_PCMCIA_B_3V3 (0x00020000)

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;

	debug ("hardware_enable: " PCMCIA_BOARD_MSG " Slot %c\n", 'A'+slot);

	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(2500);

	/*
	* Configure Port B pins for
	* 3 Volts enable
	*/
	if (slot) { /* Slot A is built-in */
		cp->cp_pbdir |=  KUP4K_PCMCIA_B_3V3;
		cp->cp_pbpar &= ~KUP4K_PCMCIA_B_3V3;
		/* remove all power */
		cp->cp_pbdat |=  KUP4K_PCMCIA_B_3V3; /* active low */
	}
	/*
	* 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.
	*/
	printf("%s  Slot %c:", slot ? "" : "\n", 'A' + slot);
	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) {
		puts (" 5.0V card found: NOT SUPPORTED !!!\n");
	} else {
		if(slot)
			cp->cp_pbdat &= ~KUP4K_PCMCIA_B_3V3;
		puts (" 3.3V card found: ");
	}
#if 0
	/*  VCC switch error flag, PCMCIA slot INPACK_ pin */
	cp->cp_pbdir &= ~(0x0020 | 0x0010);
	cp->cp_pbpar &= ~(0x0020 | 0x0010);
	udelay(500000);
#endif
	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 cpm8xx_t	*cp;
	volatile pcmconf8xx_t	*pcmp;
	u_long reg;

	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));
	cp    = (cpm8xx_t *)(&(((immap_t *)CFG_IMMR)->im_cpm));

	/* remove all power */
	if (slot)
		cp->cp_pbdat |= KUP4K_PCMCIA_B_3V3;

	/* 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;

	udelay(10000);

	return (0);
}
#endif	/* CFG_CMD_PCMCIA */


int pcmcia_voltage_set(int slot, int vcc, int vpp)
{
	volatile immap_t	*immap;
	volatile cpm8xx_t	*cp;
	volatile pcmconf8xx_t	*pcmp;
	u_long reg;

	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);

	if (!slot) /* Slot A is not configurable */
		return 0;

	immap = (immap_t *)CFG_IMMR;
	pcmp = (pcmconf8xx_t *)(&(((immap_t *)CFG_IMMR)->im_pcmcia));
	cp    = (cpm8xx_t *)(&(((immap_t *)CFG_IMMR)->im_cpm));

	/*
	* 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);

	debug ("PCMCIA power OFF\n");
	/*
	* Configure Port B pins for
	* 3 Volts enable
	*/
	cp->cp_pbdir |=  KUP4K_PCMCIA_B_3V3;
	cp->cp_pbpar &= ~KUP4K_PCMCIA_B_3V3;
	/* remove all power */
	cp->cp_pbdat |=  KUP4K_PCMCIA_B_3V3; /* active low */

	switch(vcc) {
		case  0: 		break;
		case 33:
			cp->cp_pbdat &= ~KUP4K_PCMCIA_B_3V3;
			debug ("PCMCIA powered at 3.3V\n");
			break;
		case 50:
			debug ("PCMCIA: 5Volt vcc not supported\n");
			break;
		default:
			puts("PCMCIA: vcc not supported");
			break;
	}
	udelay(10000);
	/* Checking supported voltages */

	debug ("PIPR: 0x%x --> %s\n",
	       pcmp->pcmc_pipr,
	       (pcmp->pcmc_pipr & (0x80000000 >> (slot << 4)))
			       ? "only 5 V --> NOT SUPPORTED"
	: "can do 3.3V");


	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 */