/*      $OpenBSD: ofwi2c.c,v 1.9 2014/02/21 21:28:26 deraadt Exp $      */

/*
 * Copyright (c) 2006 Theo de Raadt
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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

#include <dev/i2c/i2cvar.h>
#include <dev/ofw/openfirm.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <sparc64/pci_machdep.h>

#include <arch/sparc64/dev/ofwi2cvar.h>

void
ofwiic_pci_scan(struct device *self, struct i2cbus_attach_args *iba, void *aux)
{
        struct pci_attach_args *pa = aux;
        pcitag_t tag = pa->pa_tag;
        int iba_node = PCITAG_NODE(tag);
        char name[32];
        int node;

        for (node = OF_child(iba_node); node; node = OF_peer(node)) {
                memset(name, 0, sizeof(name));

                if (OF_getprop(node, "compatible", name, sizeof(name)) == -1)
                        continue;
                if (name[0] == '\0')
                        continue;

                if (strcmp(name, "i2c-smbus") == 0 ||
                    strcmp(name, "i2c") == 0)
                        ofwiic_scan(self, iba, &node);
        }
}

void
ofwiic_scan(struct device *self, struct i2cbus_attach_args *iba, void *aux)
{
        int iba_node = *(int *)aux;
        extern int iic_print(void *, const char *);
        struct i2c_attach_args ia;
        char name[32];
        u_int32_t reg[2];
        int node;

        for (node = OF_child(iba_node); node; node = OF_peer(node)) {
                memset(name, 0, sizeof(name));
                memset(reg, 0, sizeof(reg));

                if (OF_getprop(node, "compatible", name, sizeof(name)) == -1)
                        continue;
                if (name[0] == '\0')
                        continue;

                if (OF_getprop(node, "reg", reg, sizeof(reg)) == -1)
                        continue;

                memset(&ia, 0, sizeof(ia));
                ia.ia_tag = iba->iba_tag;
                ia.ia_addr = (reg[0] << 7) | (reg[1] >> 1);
                ia.ia_name = name;
                ia.ia_cookie = &node;

                if (strncmp(ia.ia_name, "i2c-", strlen("i2c-")) == 0)
                        ia.ia_name += strlen("i2c-");

                /* Skip non-SPD EEPROMs.  */
                if (strcmp(ia.ia_name, "at24c64") == 0 ||
                    strcmp(ia.ia_name, "at34c02") == 0) {
                        if (OF_getprop(node, "name", name, sizeof(name)) == -1)
                                continue;
                        if (strcmp(name, "dimm") == 0 ||
                            strcmp(name, "dimm-spd") == 0)
                                ia.ia_name = "spd";
                        else
                                continue;
                }

                /*
                 * XXX alipm crashes on some machines for an unknown reason
                 * when doing the periodic i2c accesses things like sensors
                 * need.  However, devices accessed only at boot are fine.
                 */
                if (strcmp(self->dv_parent->dv_xname, "alipm0") == 0 &&
                    (ia.ia_addr < 0x50 || ia.ia_addr > 0x57)) {
                        iic_print(&ia, self->dv_parent->dv_xname);
                        printf(" skipped due to %s bugs\n",
                            self->dv_parent->dv_xname);
                        continue;
                }

                config_found(self, &ia, iic_print);
        }
}