/*
 * linux/drivers/pcmcia/pxa2xx_lubbock.c
 *
 * Author:      George Davis
 * Created:     Jan 10, 2002
 * Copyright:   MontaVista Software Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Originally based upon linux/drivers/pcmcia/sa1100_neponset.c
 *
 * Lubbock PCMCIA specific routines.
 *
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>

#include <mach/hardware.h>
#include <asm/hardware/sa1111.h>
#include <asm/mach-types.h>
#include <mach/lubbock.h>

#include "sa1111_generic.h"

static int
lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
                                const socket_state_t *state)
{
        struct sa1111_pcmcia_socket *s = to_skt(skt);
        unsigned int pa_dwr_mask, pa_dwr_set, misc_mask, misc_set;
        int ret = 0;

        pa_dwr_mask = pa_dwr_set = misc_mask = misc_set = 0;

        /* Lubbock uses the Maxim MAX1602, with the following connections:
         *
         * Socket 0 (PCMCIA):
         *      MAX1602 Lubbock         Register
         *      Pin     Signal
         *      -----   -------         ----------------------
         *      A0VPP   S0_PWR0         SA-1111 GPIO A<0>
         *      A1VPP   S0_PWR1         SA-1111 GPIO A<1>
         *      A0VCC   S0_PWR2         SA-1111 GPIO A<2>
         *      A1VCC   S0_PWR3         SA-1111 GPIO A<3>
         *      VX      VCC
         *      VY      +3.3V
         *      12IN    +12V
         *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
         *
         * Socket 1 (CF):
         *      MAX1602 Lubbock         Register
         *      Pin     Signal
         *      -----   -------         ----------------------
         *      A0VPP   GND             VPP is not connected
         *      A1VPP   GND             VPP is not connected
         *      A0VCC   S1_PWR0         MISC_WR<14>
         *      A1VCC   S1_PWR1         MISC_WR<15>
         *      VX      VCC
         *      VY      +3.3V
         *      12IN    GND             VPP is not connected
         *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
         *
         */

 again:
        switch (skt->nr) {
        case 0:
                pa_dwr_mask = GPIO_A0 | GPIO_A1 | GPIO_A2 | GPIO_A3;

                switch (state->Vcc) {
                case 0: /* Hi-Z */
                        break;

                case 33: /* VY */
                        pa_dwr_set |= GPIO_A3;
                        break;

                case 50: /* VX */
                        pa_dwr_set |= GPIO_A2;
                        break;

                default:
                        printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
                               __func__, state->Vcc);
                        ret = -1;
                }

                switch (state->Vpp) {
                case 0: /* Hi-Z */
                        break;

                case 120: /* 12IN */
                        pa_dwr_set |= GPIO_A1;
                        break;

                default: /* VCC */
                        if (state->Vpp == state->Vcc)
                                pa_dwr_set |= GPIO_A0;
                        else {
                                printk(KERN_ERR "%s(): unrecognized Vpp %u\n",
                                       __func__, state->Vpp);
                                ret = -1;
                                break;
                        }
                }
                break;

        case 1:
                misc_mask = (1 << 15) | (1 << 14);

                switch (state->Vcc) {
                case 0: /* Hi-Z */
                        break;

                case 33: /* VY */
                        misc_set |= 1 << 15;
                        break;

                case 50: /* VX */
                        misc_set |= 1 << 14;
                        break;

                default:
                        printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
                               __func__, state->Vcc);
                        ret = -1;
                        break;
                }

                if (state->Vpp != state->Vcc && state->Vpp != 0) {
                        printk(KERN_ERR "%s(): CF slot cannot support Vpp %u\n",
                               __func__, state->Vpp);
                        ret = -1;
                        break;
                }
                break;

        default:
                ret = -1;
        }

        if (ret == 0)
                ret = sa1111_pcmcia_configure_socket(skt, state);

        if (ret == 0) {
                lubbock_set_misc_wr(misc_mask, misc_set);
                sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
        }

#if 1
        if (ret == 0 && state->Vcc == 33) {
                struct pcmcia_state new_state;

                /*
                 * HACK ALERT:
                 * We can't sense the voltage properly on Lubbock before
                 * actually applying some power to the socket (catch 22).
                 * Resense the socket Voltage Sense pins after applying
                 * socket power.
                 *
                 * Note: It takes about 2.5ms for the MAX1602 VCC output
                 * to rise.
                 */
                mdelay(3);

                sa1111_pcmcia_socket_state(skt, &new_state);

                if (!new_state.vs_3v && !new_state.vs_Xv) {
                        /*
                         * Switch to 5V,  Configure socket with 5V voltage
                         */
                        lubbock_set_misc_wr(misc_mask, 0);
                        sa1111_set_io(s->dev, pa_dwr_mask, 0);

                        /*
                         * It takes about 100ms to turn off Vcc.
                         */
                        mdelay(100);

                        /*
                         * We need to hack around the const qualifier as
                         * well to keep this ugly workaround localized and
                         * not force it to the rest of the code. Barf bags
                         * available in the seat pocket in front of you!
                         */
                        ((socket_state_t *)state)->Vcc = 50;
                        ((socket_state_t *)state)->Vpp = 50;
                        goto again;
                }
        }
#endif

        return ret;
}

static struct pcmcia_low_level lubbock_pcmcia_ops = {
        .owner                  = THIS_MODULE,
        .configure_socket       = lubbock_pcmcia_configure_socket,
        .first                  = 0,
        .nr                     = 2,
};

#include "pxa2xx_base.h"

int pcmcia_lubbock_init(struct sa1111_dev *sadev)
{
        int ret = -ENODEV;

        if (machine_is_lubbock()) {
                /*
                 * Set GPIO_A<3:0> to be outputs for the MAX1600,
                 * and switch to standby mode.
                 */
                sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
                sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
                sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);

                /* Set CF Socket 1 power to standby mode. */
                lubbock_set_misc_wr((1 << 15) | (1 << 14), 0);

                pxa2xx_drv_pcmcia_ops(&lubbock_pcmcia_ops);
                pxa2xx_configure_sockets(&sadev->dev);
                ret = sa1111_pcmcia_add(sadev, &lubbock_pcmcia_ops,
                                pxa2xx_drv_pcmcia_add_one);
        }

        return ret;
}

MODULE_LICENSE("GPL");