/*      $NetBSD: spd.c,v 1.16 2022/02/11 17:30:48 riastradh Exp $       */

/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: spd.c,v 1.16 2022/02/11 17:30:48 riastradh Exp $");

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

#include <machine/bootinfo.h>

#include <playstation2/ee/eevar.h>
#include <playstation2/dev/sbusvar.h>
#include <playstation2/dev/spdvar.h>
#include <playstation2/dev/spdreg.h>

#ifdef DEBUG
#define STATIC
#else
#define STATIC static
#endif

STATIC int spd_match(device_t, cfdata_t, void *);
STATIC void spd_attach(device_t, device_t, void *);
STATIC int spd_print(void *, const char *);
STATIC int spd_intr(void *);
STATIC void __spd_eeprom_out(u_int8_t *, int);
STATIC int __spd_eeprom_in(u_int8_t *);

/* SPD device can't attach twice. because PS2 PC-Card slot is only one. */
STATIC struct {
       int (*func)(void *);
       void *arg;
       const char *name;
} __spd_table[2];

CFATTACH_DECL_NEW(spd, 0,
   spd_match, spd_attach, NULL, NULL);

#ifdef DEBUG
#define LEGAL_SLOT(slot)        ((slot) >= 0 && (slot) < 2)
#endif

int
spd_match(device_t parent, cfdata_t cf, void *aux)
{

       return ((BOOTINFO_REF(BOOTINFO_DEVCONF) ==
           BOOTINFO_DEVCONF_SPD_PRESENT));
}

void
spd_attach(device_t parent, device_t self, void *aux)
{
       struct spd_attach_args spa;

       printf(": PlayStation 2 HDD Unit\n");

       switch (BOOTINFO_REF(BOOTINFO_PCMCIA_TYPE)) {
       default:
               __spd_table[0].name = "<unknown product>";
               break;
       case 0:
               /* FALLTHROUGH */
       case 1:
               /* FALLTHROUGH */
       case 2:
               __spd_table[SPD_HDD].name = "SCPH-20400";
               __spd_table[SPD_NIC].name = "SCPH-10190";
               break;
       case 3:
               __spd_table[SPD_HDD].name = "SCPH-10260";
               __spd_table[SPD_NIC].name = "SCPH-10260";
               break;
       }

       /* disable all */
       _reg_write_2(SPD_INTR_ENABLE_REG16, 0);
       _reg_write_2(SPD_INTR_CLEAR_REG16, _reg_read_2(SPD_INTR_STATUS_REG16));

       spa.spa_slot = SPD_HDD;
       spa.spa_product_name = __spd_table[SPD_HDD].name;
       config_found(self, &spa, spd_print, CFARGS_NONE);

       spa.spa_slot = SPD_NIC;
       spa.spa_product_name = __spd_table[SPD_NIC].name;
       config_found(self, &spa, spd_print, CFARGS_NONE);

       sbus_intr_establish(SBUS_IRQ_PCMCIA, spd_intr, 0);
}

int
spd_print(void *aux, const char *pnp)
{
       struct spd_attach_args *spa = aux;

       if (pnp)
               aprint_normal("%s at %s", __spd_table[spa->spa_slot].name, pnp);

       return (UNCONF);
}

int
spd_intr(void *arg)
{
       u_int16_t r;

       r = _reg_read_2(SPD_INTR_STATUS_REG16);

       /* HDD (SCPH-20400) */
       if ((r & SPD_INTR_HDD) != 0)
               if (__spd_table[SPD_HDD].func != NULL)
                       (*__spd_table[SPD_HDD].func)(__spd_table[SPD_HDD].arg);

       /* Network (SCPH-10190) */
       if ((r & (SPD_INTR_EMAC3 | SPD_INTR_RXEND | SPD_INTR_TXEND |
           SPD_INTR_RXDNV | SPD_INTR_TXDNV)) != 0)
               if (__spd_table[SPD_NIC].func)
                       (*__spd_table[SPD_NIC].func)(__spd_table[SPD_NIC].arg);

       /* reinstall */
       r = _reg_read_2(SPD_INTR_ENABLE_REG16);
       _reg_write_2(SPD_INTR_ENABLE_REG16, 0);
       _reg_write_2(SPD_INTR_ENABLE_REG16, r);

       return (1);
}

void *
spd_intr_establish(enum spd_slot slot, int (*func)(void *), void *arg)
{

       KDASSERT(LEGAL_SLOT(slot));
       KDASSERT(__spd_table[slot].func == 0);

       __spd_table[slot].func = func;
       __spd_table[slot].arg = arg;

       return ((void *)slot);
}

void
spd_intr_disestablish(void *handle)
{
       int slot = (int)handle;

       KDASSERT(LEGAL_SLOT(slot));

       __spd_table[slot].func = 0;
}

/*
* EEPROM access
*/
void
spd_eeprom_read(int addr, u_int16_t *data, int n)
{
       int i, j, s;
       u_int8_t r;

       s = _intr_suspend();

       /* set direction */
       _reg_write_1(SPD_IO_DIR_REG8, SPD_IO_CLK | SPD_IO_CS | SPD_IO_IN);

       /* chip select high */
       r = 0;
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(1);
       r |= SPD_IO_CS;
       r &= ~(SPD_IO_IN | SPD_IO_CLK);
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(1);

       /* put start bit */
       __spd_eeprom_out(&r, 1);

       /* put op code (read) */
       __spd_eeprom_out(&r, 1);
       __spd_eeprom_out(&r, 0);

       /* set address */
       for (i = 0; i < 6; i++, addr <<= 1)
               __spd_eeprom_out(&r, addr & 0x20);

       /* get data */
       for (i = 0; i < n; i++, data++)
               for (*data = 0, j = 15; j >= 0; j--)
                       *data |= (__spd_eeprom_in(&r) << j);

       /* chip select low */
       r &= ~(SPD_IO_CS | SPD_IO_IN | SPD_IO_CLK);
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(2);

       _intr_resume(s);
}

void
__spd_eeprom_out(u_int8_t *rp, int onoff)
{
       u_int8_t r = *rp;

       if (onoff)
               r |= SPD_IO_IN;
       else
               r &= ~SPD_IO_IN;

       r &= ~SPD_IO_CLK;
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(1);

       r |= SPD_IO_CLK;
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(1);

       r &= ~SPD_IO_CLK;
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(1);

       *rp = r;
}

int
__spd_eeprom_in(u_int8_t *rp)
{
       int ret;
       u_int8_t r = *rp;

       r &= ~(SPD_IO_IN | SPD_IO_CLK);
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(1);

       r |= SPD_IO_CLK;
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(1);
       ret = (_reg_read_1(SPD_IO_DATA_REG8) >> 4) & 0x1;

       r &= ~SPD_IO_CLK;
       _reg_write_1(SPD_IO_DATA_REG8, r);
       delay(1);

       *rp = r;

       return (ret);
}

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