xref: /openbsd-src/sys/arch/sparc64/dev/ofwi2c.c (revision 053384b22785905bb18b3fb3239d44c8c3e4e2a0)

/*	$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);
	}
}