/*-
* Copyright (c) 2006 Itronix Inc.
* All rights reserved.
*
* Written by Garrett D'Amore for Itronix Inc.
*
* 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.
* 3. The name of Itronix Inc. may not be used to endorse
*    or promote products derived from this software without specific
*    prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``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 ITRONIX INC. 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.
*/

/*
* ATI Technologies Inc. ("ATI") has not assisted in the creation of, and
* does not endorse, this software.  ATI will not be responsible or liable
* for any actual or alleged damage or loss caused by or in connection with
* the use of or reliance on this software.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: radeonfb_i2c.c,v 1.4 2022/09/25 17:52:25 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/bus.h>

#include <dev/i2c/i2cvar.h>
#include <dev/i2c/i2c_bitbang.h>
#include <dev/i2c/ddcvar.h>

#include <dev/pci/radeonfbreg.h>
#include <dev/pci/radeonfbvar.h>

/* i2c support */
static int radeonfb_i2c_acquire_bus(void *, int);
static void radeonfb_i2c_release_bus(void *, int);
static int radeonfb_i2c_send_start(void *, int);
static int radeonfb_i2c_send_stop(void *, int);
static int radeonfb_i2c_initiate_xfer(void *, i2c_addr_t, int);
static int radeonfb_i2c_read_byte(void *, uint8_t *, int);
static int radeonfb_i2c_write_byte(void *, uint8_t, int);

/* i2c bit-bang glue */
static void radeonfb_i2cbb_set_bits(void *, uint32_t);
static void radeonfb_i2cbb_set_dir(void *, uint32_t);
static uint32_t radeonfb_i2cbb_read(void *);

/*
* I2C bit-bang operations
*/
void
radeonfb_i2cbb_set_bits(void *cookie, uint32_t bits)
{
       struct radeonfb_i2c     *ric = (struct radeonfb_i2c *)cookie;
       struct radeonfb_softc   *sc = ric->ric_softc;

       PATCH32(sc, ric->ric_register, bits,
           ~(RADEON_GPIO_A_0 | RADEON_GPIO_A_1));
}

void
radeonfb_i2cbb_set_dir(void *cookie, uint32_t bits)
{
       struct radeonfb_i2c     *ric = (struct radeonfb_i2c *)cookie;
       struct radeonfb_softc   *sc = ric->ric_softc;

       PATCH32(sc, ric->ric_register, bits, ~(RADEON_GPIO_EN_0));
}

uint32_t
radeonfb_i2cbb_read(void *cookie)
{
       struct radeonfb_i2c     *ric = (struct radeonfb_i2c *)cookie;
       struct radeonfb_softc   *sc = ric->ric_softc;

       /* output bit is 0 shifted, input bit is shifted 8 */
       return (GET32(sc, ric->ric_register) >> RADEON_GPIO_Y_SHIFT_0);
}

static const struct i2c_bitbang_ops radeonfb_i2cbb_ops = {
       radeonfb_i2cbb_set_bits,
       radeonfb_i2cbb_set_dir,
       radeonfb_i2cbb_read,
       {
               RADEON_GPIO_A_0,        /* SDA */
               RADEON_GPIO_A_1,        /* SCL */
               RADEON_GPIO_EN_0,       /* SDA output */
               0,                      /* SDA input */
       }
};

/*
* I2C support
*/
int
radeonfb_i2c_acquire_bus(void *cookie, int flags)
{
       struct radeonfb_i2c     *ric = (struct radeonfb_i2c *)cookie;
       struct radeonfb_softc   *sc = ric->ric_softc;
       int                     i;

       /*
        * Some hardware seems to have hardware/software combined access
        * to the DVI I2C.  We want to use software.
        */
       if (ric->ric_register == RADEON_GPIO_DVI_DDC) {

               /* ask for software access to I2C bus */
               SET32(sc, ric->ric_register, RADEON_GPIO_SW_USE);

               /*
                * wait for the chip to give up access.  we don't make
                * this a hard timeout, because some hardware might
                * not implement this negotiation protocol
                */
               for (i = RADEON_TIMEOUT; i; i--) {
                       if (GET32(sc, ric->ric_register) & RADEON_GPIO_SW_USE)
                               break;
               }
       }

       /* enable the I2C clock */
       SET32(sc, ric->ric_register, RADEON_GPIO_EN_1);

       return 0;
}

void
radeonfb_i2c_release_bus(void *cookie, int flags)
{
       struct radeonfb_i2c     *ric = (struct radeonfb_i2c *)cookie;
       struct radeonfb_softc   *sc = ric->ric_softc;

       if (ric->ric_register == RADEON_GPIO_DVI_DDC) {
               /* we no longer "want" I2C, and we're "done" with it */
               CLR32(sc, ric->ric_register, RADEON_GPIO_SW_USE);
               SET32(sc, ric->ric_register, RADEON_GPIO_SW_DONE);
       }
}

int
radeonfb_i2c_send_start(void *cookie, int flags)
{

       return i2c_bitbang_send_start(cookie, flags, &radeonfb_i2cbb_ops);
}

int
radeonfb_i2c_send_stop(void *cookie, int flags)
{

       return i2c_bitbang_send_stop(cookie, flags, &radeonfb_i2cbb_ops);
}

int
radeonfb_i2c_initiate_xfer(void *cookie, i2c_addr_t addr, int flags)
{

       return i2c_bitbang_initiate_xfer(cookie, addr, flags,
           &radeonfb_i2cbb_ops);
}

int
radeonfb_i2c_read_byte(void *cookie, uint8_t *valp, int flags)
{

       return i2c_bitbang_read_byte(cookie, valp, flags, &radeonfb_i2cbb_ops);
}

int
radeonfb_i2c_write_byte(void *cookie, uint8_t val, int flags)
{

       return i2c_bitbang_write_byte(cookie, val, flags, &radeonfb_i2cbb_ops);
}

void
radeonfb_i2c_init(struct radeonfb_softc *sc)
{
       int     i;

       for (i = 0; i < 4; i++) {
               struct i2c_controller   *icc = &sc->sc_i2c[i].ric_controller;

               sc->sc_i2c[i].ric_softc = sc;
               iic_tag_init(icc);
               icc->ic_cookie = &sc->sc_i2c[i];
               icc->ic_acquire_bus = radeonfb_i2c_acquire_bus;
               icc->ic_release_bus = radeonfb_i2c_release_bus;
               icc->ic_send_start = radeonfb_i2c_send_start;
               icc->ic_send_stop = radeonfb_i2c_send_stop;
               icc->ic_initiate_xfer = radeonfb_i2c_initiate_xfer;
               icc->ic_read_byte = radeonfb_i2c_read_byte;
               icc->ic_write_byte = radeonfb_i2c_write_byte;
       }

       /* index == ddctype (RADEON_DDC_XX) - 1 */
       sc->sc_i2c[0].ric_register = RADEON_GPIO_MONID;
       sc->sc_i2c[1].ric_register = RADEON_GPIO_DVI_DDC;
       sc->sc_i2c[2].ric_register = RADEON_GPIO_VGA_DDC;
       sc->sc_i2c[3].ric_register = RADEON_GPIO_CRT2_DDC;
}

int
radeonfb_i2c_read_edid(struct radeonfb_softc *sc, int ddctype, uint8_t *data)
{

       if ((ddctype < 1) || (ddctype > 4))
               return EINVAL;

       ddctype--;
       return (ddc_read_edid(&sc->sc_i2c[ddctype].ric_controller, data, 128));
}

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