xref: /titanic_50/usr/src/uts/sun4u/snowbird/os/snowbird.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <sys/sunddi.h>
#include <sys/esunddi.h>
#include <sys/sunndi.h>

#include <sys/platform_module.h>
#include <sys/errno.h>

#define	SHARED_SMBUS_PATH	"/pci@1f,0/pci@1,1/pmu@3/i2c@0,0/i2c-nvram@0,8e"
static dev_info_t *shared_smbus_dip;
static kmutex_t snowbird_smbus_mutex;

void
startup_platform(void)
{
	mutex_init(&snowbird_smbus_mutex, NULL, NULL, NULL);
}

int
set_platform_tsb_spares()
{
	return (0);
}

void
set_platform_defaults(void)
{
	extern char *tod_module_name;
	tod_module_name = "todds1307";
}

/*
 * Definitions for accessing the pci config space of the isa node
 * of Southbridge.
 */
#define	PLATFORM_ISA_PATHNAME	"/pci@1f,0/isa@7"
#define	PLATFORM_ISA_PATHNAME_WITH_SIMBA	"/pci@1f,0/pci@1,1/isa@7"
ddi_acc_handle_t 	platform_isa_handle;	/* handle for isa pci space */

void
load_platform_drivers(void)
{
	dev_info_t 		*dip;		/* dip of the isa driver */

	if (ddi_install_driver("power") != DDI_SUCCESS)
		cmn_err(CE_WARN, "Failed to install \"power\" driver.");

	/*
	 * It is OK to return error because 'us' driver is not available
	 * in all clusters (e.g. missing in Core cluster).
	 */
	(void) ddi_install_driver("us");

	/*
	 * Install Isa driver. This is required for the southbridge IDE
	 * workaround - to reset the IDE channel during IDE bus reset.
	 * Panic the system in case ISA driver could not be loaded or
	 * any problem in accessing its pci config space. Since the register
	 * to reset the channel for IDE is in ISA config space!.
	 */
	dip = e_ddi_hold_devi_by_path(PLATFORM_ISA_PATHNAME_WITH_SIMBA, 0);

	if (dip == NULL)
	    dip = e_ddi_hold_devi_by_path(PLATFORM_ISA_PATHNAME, 0);

	if (dip == NULL) {
		cmn_err(CE_PANIC, "Could not install the isa driver\n");
		return;
	}

	if (pci_config_setup(dip, &platform_isa_handle) != DDI_SUCCESS) {
		cmn_err(CE_PANIC, "Could not get the config space of isa\n");
		return;
	}

	/*
	 * Figure out which smbus_dip is shared with OBP for the nvram
	 * device, so the lock can be acquired.
	 *
	 * This should really be done elsewhere, like startup_platform, but
	 * that runs before the devinfo tree is setup with configure().
	 * So it is here until there is a better place.
	 */
	dip = e_ddi_hold_devi_by_path(SHARED_SMBUS_PATH, 0);

	if (dip != NULL) {
		ASSERT(dip != NULL);
		shared_smbus_dip = ddi_get_parent(dip);

		ndi_hold_devi(shared_smbus_dip);
		ndi_rele_devi(dip);
	} else {
		shared_smbus_dip = NULL;
	}

	/*
	 * Install the TOD driver
	 */
	if (ddi_install_driver("todds1307") != DDI_SUCCESS)
		cmn_err(CE_WARN, "Failed to install \"todds1307\" driver.");
}

/*
 * This routine provides a workaround for a bug in the SB chip which
 * can cause data corruption. Will be invoked from the IDE HBA driver for
 * Acer SouthBridge at the time of IDE bus reset.
 */
/*ARGSUSED*/
int
plat_ide_chipreset(dev_info_t *dip, int chno)
{
	uint8_t	val;
	int	ret = DDI_SUCCESS;

	val = pci_config_get8(platform_isa_handle, 0x58);
	/*
	 * The dip passed as the argument is not used for snowbird.
	 * This will be needed for platforms which have multiple on-board SB,
	 * The dip passed will be used to match the corresponding ISA node.
	 */
	switch (chno) {
		case 0:
			/*
			 * First disable the primary channel then re-enable it.
			 * As per ALI no wait should be required in between have
			 * given 1ms delay in between to be on safer side.
			 * bit 2 of register 0x58 when 0 disable the channel 0.
			 * bit 2 of register 0x58 when 1 enables the channel 0.
			 */
			pci_config_put8(platform_isa_handle, 0x58, val & 0xFB);
			drv_usecwait(1000);
			pci_config_put8(platform_isa_handle, 0x58, val);
			break;
		case 1:
			/*
			 * bit 3 of register 0x58 when 0 disable the channel 1.
			 * bit 3 of register 0x58 when 1 enables the channel 1.
			 */
			pci_config_put8(platform_isa_handle, 0x58, val & 0xF7);
			drv_usecwait(1000);
			pci_config_put8(platform_isa_handle, 0x58, val);
			break;
		default:
			/*
			 * Unknown channel number passed. Return failure.
			 */
			ret = DDI_FAILURE;
	}

	return (ret);
}



/*ARGSUSED*/
int
plat_cpu_poweron(struct cpu *cp)
{
	return (ENOTSUP);	/* not supported on this platform */
}

/*ARGSUSED*/
int
plat_cpu_poweroff(struct cpu *cp)
{
	return (ENOTSUP);	/* not supported on this platform */
}

/*ARGSUSED*/
void
plat_freelist_process(int mnode)
{
}

char *platform_module_list[] = {
	(char *)0
};

/*ARGSUSED*/
void
plat_tod_fault(enum tod_fault_type tod_bad)
{
}

/*
 * Unfortunately, snowbird's smbus controller is used by both OBP
 * and the OS's i2c drivers.  The 'eeprom' command executes
 * OBP code to handle property requests.  If eeprom didn't do this, or if the
 * controllers were partitioned so that all devices on a given controller were
 * driven by either OBP or the OS, this wouldn't be necessary.
 *
 * Note that getprop doesn't have the same issue as it reads from cached
 * memory in OBP.
 */

/*
 * Common locking enter code
 */
void
plat_setprop_enter(void)
{
	mutex_enter(&snowbird_smbus_mutex);
}

/*
 * Common locking exit code
 */
void
plat_setprop_exit(void)
{
	mutex_exit(&snowbird_smbus_mutex);
}

/*
 * Called by smbus driver
 */
void
plat_shared_i2c_enter(dev_info_t *dip)
{
	if (dip == shared_smbus_dip) {
		plat_setprop_enter();
	}
}

/*
 * Called by smbus driver
 */
void
plat_shared_i2c_exit(dev_info_t *dip)
{
	if (dip == shared_smbus_dip) {
		plat_setprop_exit();
	}
}