/*      $NetBSD: ipaq_atmelgpio.c,v 1.19 2023/12/20 14:50:02 thorpej Exp $      */

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.  All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Ichiro FUKUHARA (ichiro@ichiro.org).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * iPAQ uses Atmel microcontroller to service a few of peripheral devices.
 * This controller connect to UART1 of SA11x0.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ipaq_atmelgpio.c,v 1.19 2023/12/20 14:50:02 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/bus.h>

#include <hpcarm/dev/ipaq_saipvar.h>
#include <hpcarm/dev/ipaq_gpioreg.h>
#include <hpcarm/dev/ipaq_atmel.h>
#include <hpcarm/dev/ipaq_atmelvar.h>

#include <arm/sa11x0/sa11x0_gpioreg.h>
#include <arm/sa11x0/sa11x0_comreg.h>
#include <arm/sa11x0/sa11x0_reg.h>

#ifdef ATMEL_DEBUG
#define DPRINTF(x) aprint_normal x
#else
#define DPRINTF(x)
#endif

static  int     atmelgpio_match(device_t, cfdata_t, void *);
static  void    atmelgpio_attach(device_t, device_t, void *);
static  int     atmelgpio_print(void *, const char *);
static  int     atmelgpio_search(device_t, cfdata_t, const int *, void *);
static  void    atmelgpio_init(struct atmelgpio_softc *);

static  void    rxtx_data(struct atmelgpio_softc *, int, int,
                         uint8_t *, struct atmel_rx *);

CFATTACH_DECL_NEW(atmelgpio, sizeof(struct atmelgpio_softc),
    atmelgpio_match, atmelgpio_attach, NULL, NULL);

static int
atmelgpio_match(device_t parent, cfdata_t cf, void *aux)
{
        return (1);
}

static void
atmelgpio_attach(device_t parent, device_t self, void *aux)
{
        struct atmelgpio_softc *sc = device_private(self);
        struct ipaq_softc *psc = device_private(parent);

        struct atmel_rx rxbuf;

        aprint_normal("\n");
        aprint_normal_dev(self, "Atmel microcontroller GPIO\n");

        sc->sc_iot = psc->sc_iot;
        sc->sc_ioh = psc->sc_ioh;
        sc->sc_parent = psc;

        if (bus_space_map(sc->sc_iot, SACOM1_BASE, SACOM_NPORTS, 0,
                        &sc->sc_ioh)) {
                aprint_normal_dev(self, "unable to map of UART1 registers\n");
                return;
        }

        atmelgpio_init(sc);

        rxbuf.idx = 0;
        rxbuf.len = 0;

#if 1  /* this is sample */
        rxtx_data(sc, STATUS_BATTERY, 0, NULL, &rxbuf); 

        aprint_normal("ac_status          = %x\n", rxbuf.data[0]);
        aprint_normal("Battery kind       = %x\n", rxbuf.data[1]);
        aprint_normal("Voltage            = %d mV\n",
                1000 * (rxbuf.data[3] << 8 | rxbuf.data[2]) /228);
        aprint_normal("Battery Status     = %x\n", rxbuf.data[4]);
        aprint_normal("Battery percentage = %d\n",
                425 * (rxbuf.data[3] << 8 | rxbuf.data[2]) /1000 - 298);
#endif

        rxtx_data(sc, READ_IIC, 0, NULL, &rxbuf);

        /*
         *  Attach each devices
         */

        config_search(self, NULL,
            CFARGS(.search = atmelgpio_search));
}

static int
atmelgpio_search(device_t parent, cfdata_t cf, const int *ldesc,
                 void *aux)
{
        if (config_probe(parent, cf, NULL))
                config_attach(parent, cf, NULL, atmelgpio_print, CFARGS_NONE);
        return 0;
}


static int
atmelgpio_print(void *aux, const char *name)
{
        return (UNCONF);
}

static void
atmelgpio_init(struct atmelgpio_softc *sc)
{
        /* 8 bits no parity 1 stop bit */
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_CR0, CR0_DSS);

        /* Set baud rate 115k */
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_CR1, 0);
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_CR2, SACOMSPEED(115200));

        /* RX/TX enable, RX/TX FIFO interrupt enable */
        bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_CR3,
                         (CR3_RXE | CR3_TXE | CR3_RIE | CR3_TIE));
}

static void
rxtx_data(struct atmelgpio_softc  *sc, int id, int size, uint8_t *buf,
          struct atmel_rx *rxbuf)
{
        int             i, checksum, length, rx_data;
        uint8_t         data[MAX_SENDSIZE];

        length = size + FRAME_OVERHEAD_SIZE;

        while (! (bus_space_read_4(sc->sc_iot, sc->sc_ioh, SACOM_SR0) & SR0_TFS))
                ;

                data[0] = (uint8_t)FRAME_SOF; 
                data[1] = (uint8_t)((id << 4) | size);
                checksum = data[1];
                i = 2;
                while (size--)  {
                        data[i++] = *buf;
                        checksum += (uint8_t)(*buf++);
                }
                data[length-1] = checksum;

        while (! (bus_space_read_4(sc->sc_iot, sc->sc_ioh, SACOM_SR1) & SR1_TNF))
                ;
                i = 0;
                while (i < length)
                        bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_DR, data[i++]);

        delay(10000);
#if 0
        while (! (bus_space_read_4(sc->sc_iot, sc->sc_ioh, SACOM_SR0) &
                 (SR0_RID | SR0_RFS)))
#endif
        rxbuf->state = STATE_SOF;
        while (bus_space_read_4(sc->sc_iot, sc->sc_ioh, SACOM_SR1) & SR1_RNE) {

                rx_data = bus_space_read_4(sc->sc_iot, sc->sc_ioh, SACOM_DR);
                        DPRINTF(("DATA = %x\n", rx_data));

                switch (rxbuf->state) {
                case STATE_SOF:
                        if (rx_data == FRAME_SOF)
                                rxbuf->state = STATE_ID;
                        break;
                case STATE_ID:
                        rxbuf->id = (rx_data & 0xf0) >> 4;
                        rxbuf->len = rx_data & 0x0f;
                        rxbuf->idx = 0;
                        rxbuf->checksum = rx_data;
                        rxbuf->state = (rxbuf->len > 0 ) ? STATE_DATA : STATE_EOF;
                        break;
                case STATE_DATA:
                        rxbuf->checksum += rx_data;
                        rxbuf->data[rxbuf->idx] = rx_data;
                        if (++rxbuf->idx == rxbuf->len)
                                rxbuf->state = STATE_EOF;
                        break;
                case STATE_EOF:
                        rxbuf->state = STATE_SOF;
                        if (rx_data == FRAME_EOF || rx_data == rxbuf->checksum)
                                DPRINTF(("frame EOF\n"));
                        else
                                DPRINTF(("BadFrame\n"));
                        break;
                default:
                        break;
                }
        }
}