/* 
 * drivers/pcmcia/sa1100_stork.c
 *
    Copyright 2001 (C) Ken Gordon

    This is derived from pre-existing drivers/pcmcia/sa1100_?????.c

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

 * 
 * PCMCIA implementation routines for stork
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/i2c.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/arch/pcmcia.h>

static int debug = 0;

static struct pcmcia_init sa1100_stork_pcmcia_init;

static int stork_pcmcia_init(struct pcmcia_init *init)
{
        int irq, res;
        printk("in stork_pcmcia_init\n");

        sa1100_stork_pcmcia_init = *init;

        /* Enable CF bus: */
        storkSetLatchA(STORK_PCMCIA_PULL_UPS_POWER_ON);

	/* Set transition detect */
	set_GPIO_IRQ_edge( GPIO_STORK_PCMCIA_A_CARD_DETECT | GPIO_STORK_PCMCIA_B_CARD_DETECT, GPIO_BOTH_EDGES );
        set_GPIO_IRQ_edge( GPIO_STORK_PCMCIA_A_RDY| GPIO_STORK_PCMCIA_B_RDY, GPIO_FALLING_EDGE );

	/* Register interrupts */
	irq = IRQ_GPIO_STORK_PCMCIA_A_CARD_DETECT;
	res = request_irq( irq, init->handler, SA_INTERRUPT, "PCMCIA_CD0", NULL );
	if( res < 0 ) goto irq_err;
	irq = IRQ_GPIO_STORK_PCMCIA_B_CARD_DETECT;
	res = request_irq( irq, init->handler, SA_INTERRUPT, "PCMCIA_CD1", NULL );
	if( res < 0 ) goto irq_err;

        return 2;

 irq_err:
        printk( KERN_ERR __FUNCTION__ ": Request for IRQ %u failed\n", irq );
        return -1;
}

static int stork_pcmcia_shutdown(void)
{
        printk(__FUNCTION__ "\n");
        /* disable IRQs */
        free_irq( IRQ_GPIO_STORK_PCMCIA_A_CARD_DETECT, NULL );
        free_irq( IRQ_GPIO_STORK_PCMCIA_B_CARD_DETECT, NULL );
  
        /* Disable CF bus: */
        storkClearLatchA(STORK_PCMCIA_PULL_UPS_POWER_ON);
	storkClearLatchA(STORK_PCMCIA_A_POWER_ON);
	storkClearLatchA(STORK_PCMCIA_B_POWER_ON);
        return 0;
}

static int stork_pcmcia_socket_state(struct pcmcia_state_array *state_array)
{
        unsigned long levels;

        if(state_array->size<2) return -1;

        memset(state_array->state, 0, 
               (state_array->size)*sizeof(struct pcmcia_state));

        levels=GPLR;

	if (debug > 1)
		printk(__FUNCTION__ " GPLR=%x IRQ[1:0]=%x\n", GPLR, (GPLR & (GPIO_STORK_PCMCIA_A_RDY|GPIO_STORK_PCMCIA_B_RDY)));
	state_array->state[0].detect=((levels & GPIO_STORK_PCMCIA_A_CARD_DETECT)==0)?1:0;
	state_array->state[0].ready=(levels & GPIO_STORK_PCMCIA_A_RDY)?1:0;
	state_array->state[0].bvd1= 1;
	state_array->state[0].bvd2= 1;
	state_array->state[0].wrprot=0;
	state_array->state[0].vs_3v=1;
	state_array->state[0].vs_Xv=0;

	state_array->state[1].detect=((levels & GPIO_STORK_PCMCIA_B_CARD_DETECT)==0)?1:0;
	state_array->state[1].ready=(levels & GPIO_STORK_PCMCIA_B_RDY)?1:0;
	state_array->state[1].bvd1=1;
	state_array->state[1].bvd2=1;
	state_array->state[1].wrprot=0;
	state_array->state[1].vs_3v=1;
	state_array->state[1].vs_Xv=0;

        return 1;
}

static int stork_pcmcia_get_irq_info(struct pcmcia_irq_info *info)
{

        switch (info->sock) {
        case 0:
                info->irq=IRQ_GPIO_STORK_PCMCIA_A_RDY;
                break;
        case 1:
                info->irq=IRQ_GPIO_STORK_PCMCIA_B_RDY;
                break;
        default:
                return -1;
        }
        return 0;
}

static int stork_pcmcia_configure_socket(const struct pcmcia_configure *configure)
{
        int card = configure->sock;
	unsigned long flags;

        int DETECT, RDY, POWER, RESET;

        if (card > 1) return -1;

	printk(__FUNCTION__ ": socket=%d vcc=%d vpp=%d reset=%d\n", 
                       card, configure->vcc, configure->vpp, configure->reset);

	save_flags_cli(flags);

        if (card == 0) {
    	    DETECT = GPIO_STORK_PCMCIA_A_CARD_DETECT;
    	    RDY = GPIO_STORK_PCMCIA_A_RDY;
    	    POWER = STORK_PCMCIA_A_POWER_ON;
    	    RESET = STORK_PCMCIA_A_RESET;
        } else {
    	    DETECT = GPIO_STORK_PCMCIA_B_CARD_DETECT;
    	    RDY = GPIO_STORK_PCMCIA_B_RDY;
    	    POWER = STORK_PCMCIA_B_POWER_ON;
    	    RESET = STORK_PCMCIA_B_RESET;
        }
    
/*
        if (storkTestGPIO(DETECT)) {
           printk("no card detected - but resetting anyway\r\n");
        }
*/
	switch (configure->vcc) {
	case 0:
/*		storkClearLatchA(STORK_PCMCIA_PULL_UPS_POWER_ON); */
                storkClearLatchA(POWER);
		break;

	case 50:
	case 33:
                storkSetLatchA(STORK_PCMCIA_PULL_UPS_POWER_ON);
                storkSetLatchA(POWER);
		break;

	default:
		printk(KERN_ERR "%s(): unrecognized Vcc %u\n", __FUNCTION__,
		       configure->vcc);
		restore_flags(flags);
		return -1;
	}

	if (configure->reset)
                storkSetLatchB(RESET);
	else
                storkClearLatchB(RESET);

	restore_flags(flags);

        /* silently ignore vpp and speaker enables. */

        printk(__FUNCTION__ ": finished\n");

        return 0;
}

struct pcmcia_low_level stork_pcmcia_ops = { 
        stork_pcmcia_init,
        stork_pcmcia_shutdown,
        stork_pcmcia_socket_state,
        stork_pcmcia_get_irq_info,
        stork_pcmcia_configure_socket
};