pmugpio.c revision 1bde0be88b435e0d708ac4f377f1a521530f2ebd
/*
* 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 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/modctl.h>
#include <sys/ddi_impldefs.h>
#include <sys/kmem.h>
#include <sys/devops.h>
/*
* The pmugpio driver supports ALOM GPIO bits for resetSC and
* watchdog heartbeat on all relevant platforms. Historically,
* pmugpio is a leaf off the Chalupa pmubus. In addition to
* this support the pmugpio driver has been modified to support
* Minneapolis/Boston Controller (MBC) FPGA GPIO and Seattle CPLD
* GPIO.
*/
typedef enum {
PMUGPIO_MBC, /* Boston MBC FPGA GPIO - 8-bit */
PMUGPIO_CPLD, /* Seattle CPLD GPIO - 8-bit */
PMUGPIO_OTHER /* Chalupa - 8-bit */
} pmugpio_access_type_t;
/*
* FWARC 2005/686: gpio device compatible property
*/
#define PMUGPIO_DEVICE_TYPE "gpio-device-type"
/*
* CPLD GPIO Register defines.
*/
#define CPLD_RESET_SC 0x01 /* Reset SC */
#define CPLD_WATCHDOG 0x02 /* Watchdog */
#define CPLD_RESET_DELAY 3 /* microsecond delay */
/*
* MBC FPGA CSR defines.
*/
#define MBC_PPC_RESET 0x10 /* Reset ALOM */
#define MBC_WATCHDOG 0x40 /* Watchdog heartbeat bit */
/*
* Time periods, in nanoseconds
*/
#define PMUGPIO_TWO_SEC 2000000000LL
static dev_info_t *pmugpio_dip;
typedef struct pmugpio_state {
uint8_t *pmugpio_reset_reg;
ddi_acc_handle_t pmugpio_reset_reg_handle;
uint8_t *pmugpio_watchdog_reg;
ddi_acc_handle_t pmugpio_watchdog_reg_handle;
hrtime_t hw_last_pat;
pmugpio_access_type_t access_type;
} pmugpio_state_t;
static void *pmugpio_statep;
static int pmugpio_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int pmugpio_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);
static int pmugpio_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg,
void **result);
static int pmugpio_map_regs(dev_info_t *, pmugpio_state_t *);
struct cb_ops pmugpio_cb_ops = {
nulldev, /* open */
nulldev, /* close */
nulldev, /* strategy */
nulldev, /* print */
nulldev, /* dump */
nulldev, /* read */
nulldev, /* write */
nulldev, /* ioctl */
nulldev, /* devmap */
nulldev, /* mmap */
nulldev, /* segmap */
nochpoll, /* poll */
ddi_prop_op, /* cb_prop_op */
NULL, /* streamtab */
D_MP | D_NEW
};
static struct dev_ops pmugpio_ops = {
DEVO_REV, /* Devo_rev */
0, /* Refcnt */
pmugpio_info, /* Info */
nulldev, /* Identify */
nulldev, /* Probe */
pmugpio_attach, /* Attach */
pmugpio_detach, /* Detach */
nodev, /* Reset */
&pmugpio_cb_ops, /* Driver operations */
0, /* Bus operations */
NULL /* Power */
};
static struct modldrv modldrv = {
&mod_driverops, /* This one is a driver */
"Pmugpio Driver %I%", /* Name of the module. */
&pmugpio_ops, /* Driver ops */
};
static struct modlinkage modlinkage = {
MODREV_1, (void *)&modldrv, NULL
};
int
_init(void)
{
int error;
/* Initialize the soft state structures */
if ((error = ddi_soft_state_init(&pmugpio_statep,
sizeof (pmugpio_state_t), 1)) != 0) {
return (error);
}
/* Install the loadable module */
if ((error = mod_install(&modlinkage)) != 0) {
ddi_soft_state_fini(&pmugpio_statep);
}
return (error);
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
int
_fini(void)
{
int error;
error = mod_remove(&modlinkage);
if (error == 0) {
/* Release per module resources */
ddi_soft_state_fini(&pmugpio_statep);
}
return (error);
}
static int
pmugpio_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
int instance;
pmugpio_state_t *pmugpio_ptr = NULL;
switch (cmd) {
case DDI_ATTACH:
break;
case DDI_RESUME:
return (DDI_SUCCESS);
default:
return (DDI_FAILURE);
}
/* Get the instance and create soft state */
instance = ddi_get_instance(dip);
if (ddi_soft_state_zalloc(pmugpio_statep, instance) != 0) {
return (DDI_FAILURE);
}
pmugpio_ptr = ddi_get_soft_state(pmugpio_statep, instance);
if (pmugpio_ptr == NULL) {
return (DDI_FAILURE);
}
if (pmugpio_map_regs(dip, pmugpio_ptr) != DDI_SUCCESS) {
ddi_soft_state_free(pmugpio_statep, instance);
return (DDI_FAILURE);
}
/* Display information in the banner */
ddi_report_dev(dip);
/* Save the dip */
pmugpio_dip = dip;
return (DDI_SUCCESS);
}
/* ARGSUSED */
static int
pmugpio_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
/* Pointer to soft state */
switch (cmd) {
case DDI_SUSPEND:
return (DDI_SUCCESS);
default:
return (DDI_FAILURE);
}
}
/* ARGSUSED */
static int
pmugpio_info(dev_info_t *dip, ddi_info_cmd_t infocmd,
void *arg, void **result)
{
dev_t dev;
int instance, error;
switch (infocmd) {
case DDI_INFO_DEVT2DEVINFO:
*result = (void *)pmugpio_dip;
error = DDI_SUCCESS;
break;
case DDI_INFO_DEVT2INSTANCE:
dev = (dev_t)arg;
instance = getminor(dev);
*result = (void *)(uintptr_t)instance;
error = DDI_SUCCESS;
break;
default:
error = DDI_FAILURE;
}
return (error);
}
void
pmugpio_watchdog_pat(void)
{
dev_info_t *dip = pmugpio_dip;
int instance;
pmugpio_state_t *pmugpio_ptr;
hrtime_t now;
uint8_t value;
if (dip == NULL) {
return;
}
instance = ddi_get_instance(dip);
pmugpio_ptr = ddi_get_soft_state(pmugpio_statep, instance);
if (pmugpio_ptr == NULL) {
return;
}
/*
* The RMC can read interrupts either high to low OR low to high. As
* a result all that needs to happen is that when we hit the time to
* send an signal we simply need to change the state.
*/
now = gethrtime();
if ((now - pmugpio_ptr->hw_last_pat) >= PMUGPIO_TWO_SEC) {
/*
* fetch current reg value and invert it
*/
switch (pmugpio_ptr->access_type) {
case PMUGPIO_CPLD:
value = (CPLD_WATCHDOG ^
ddi_get8(pmugpio_ptr->pmugpio_watchdog_reg_handle,
pmugpio_ptr->pmugpio_watchdog_reg));
ddi_put8(pmugpio_ptr->pmugpio_watchdog_reg_handle,
pmugpio_ptr->pmugpio_watchdog_reg, value);
break;
case PMUGPIO_MBC:
value = (uint8_t)(MBC_WATCHDOG ^
ddi_get8(pmugpio_ptr->pmugpio_watchdog_reg_handle,
pmugpio_ptr->pmugpio_watchdog_reg));
ddi_put8(pmugpio_ptr->pmugpio_watchdog_reg_handle,
pmugpio_ptr->pmugpio_watchdog_reg, value);
break;
case PMUGPIO_OTHER:
value = (uint8_t)(0xff ^
ddi_get8(pmugpio_ptr->pmugpio_watchdog_reg_handle,
pmugpio_ptr->pmugpio_watchdog_reg));
ddi_put8(pmugpio_ptr->pmugpio_watchdog_reg_handle,
pmugpio_ptr->pmugpio_watchdog_reg, value);
break;
default:
cmn_err(CE_WARN, "pmugpio_watchdog_pat: Invalid type");
}
pmugpio_ptr->hw_last_pat = now;
}
}
void
pmugpio_reset(void)
{
dev_info_t *dip = pmugpio_dip;
int instance;
pmugpio_state_t *pmugpio_ptr;
uint8_t value;
if (dip == NULL) {
return;
}
instance = ddi_get_instance(dip);
pmugpio_ptr = ddi_get_soft_state(pmugpio_statep, instance);
if (pmugpio_ptr == NULL) {
return;
}
/*
* For Chalupa, turn all bits on then off again - pmubus nexus
* will ensure that only unmasked bit is affected.
* For CPLD and MBC, turn just reset bit on, then off.
*/
switch (pmugpio_ptr->access_type) {
case PMUGPIO_CPLD:
value = ddi_get8(pmugpio_ptr->pmugpio_reset_reg_handle,
pmugpio_ptr->pmugpio_reset_reg);
ddi_put8(pmugpio_ptr->pmugpio_reset_reg_handle,
pmugpio_ptr->pmugpio_reset_reg, (value | CPLD_RESET_SC));
drv_usecwait(CPLD_RESET_DELAY);
ddi_put8(pmugpio_ptr->pmugpio_reset_reg_handle,
pmugpio_ptr->pmugpio_reset_reg, (value & ~CPLD_RESET_SC));
break;
case PMUGPIO_MBC:
value = ddi_get8(pmugpio_ptr->pmugpio_reset_reg_handle,
pmugpio_ptr->pmugpio_reset_reg);
ddi_put8(pmugpio_ptr->pmugpio_reset_reg_handle,
pmugpio_ptr->pmugpio_reset_reg,
(value | MBC_PPC_RESET));
ddi_put8(pmugpio_ptr->pmugpio_reset_reg_handle,
pmugpio_ptr->pmugpio_reset_reg,
(value & ~MBC_PPC_RESET));
break;
case PMUGPIO_OTHER:
ddi_put8(pmugpio_ptr->pmugpio_reset_reg_handle,
pmugpio_ptr->pmugpio_reset_reg, ~0);
ddi_put8(pmugpio_ptr->pmugpio_reset_reg_handle,
pmugpio_ptr->pmugpio_reset_reg, 0);
break;
default:
cmn_err(CE_WARN, "pmugpio_reset: Invalid type");
}
}
static int
pmugpio_map_regs(dev_info_t *dip, pmugpio_state_t *pmugpio_ptr)
{
ddi_device_acc_attr_t attr;
char *pmugpio_type;
/* The host controller will be little endian */
attr.devacc_attr_version = DDI_DEVICE_ATTR_V0;
attr.devacc_attr_endian_flags = DDI_STRUCTURE_LE_ACC;
attr.devacc_attr_dataorder = DDI_STRICTORDER_ACC;
/*
* Determine access type per FWARC 2005/686.
* For Boston and Seattle, the OBP gpio device contains a property
* named "gpio-device-type".
*
* Boston: gpio-device-type = SUNW,mbc
* Seattle: gpio-device-type = SUNW,cpld
*
* If this property does not exist, we are a legacy Chalupa.
*/
if (ddi_prop_lookup_string(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS,
PMUGPIO_DEVICE_TYPE, &pmugpio_type) == DDI_PROP_SUCCESS) {
if (strcmp(pmugpio_type, "SUNW,mbc") == 0)
pmugpio_ptr->access_type = PMUGPIO_MBC;
else if (strcmp(pmugpio_type, "SUNW,cpld") == 0)
pmugpio_ptr->access_type = PMUGPIO_CPLD;
else {
cmn_err(CE_WARN, "unexpected gpio-device-type: %s\n",
pmugpio_type);
ddi_prop_free(pmugpio_type);
return (DDI_FAILURE);
}
ddi_prop_free(pmugpio_type);
}
else
pmugpio_ptr->access_type = PMUGPIO_OTHER;
switch (pmugpio_ptr->access_type) {
case PMUGPIO_CPLD:
case PMUGPIO_MBC:
if (ddi_regs_map_setup(dip, 0,
(caddr_t *)&pmugpio_ptr->pmugpio_reset_reg, 0, 1, &attr,
&pmugpio_ptr->pmugpio_reset_reg_handle) != DDI_SUCCESS)
return (DDI_FAILURE);
/* MBC and CPLD have reset and watchdog bits in same reg. */
pmugpio_ptr->pmugpio_watchdog_reg_handle =
pmugpio_ptr->pmugpio_reset_reg_handle;
pmugpio_ptr->pmugpio_watchdog_reg =
pmugpio_ptr->pmugpio_reset_reg;
break;
case PMUGPIO_OTHER:
if (ddi_regs_map_setup(dip, 1,
(caddr_t *)&pmugpio_ptr->pmugpio_watchdog_reg, 0, 1, &attr,
&pmugpio_ptr->pmugpio_watchdog_reg_handle) != DDI_SUCCESS) {
return (DDI_FAILURE);
}
if (ddi_regs_map_setup(dip, 0,
(caddr_t *)&pmugpio_ptr->pmugpio_reset_reg, 0, 1, &attr,
&pmugpio_ptr->pmugpio_reset_reg_handle) != DDI_SUCCESS) {
ddi_regs_map_free(
&pmugpio_ptr->pmugpio_watchdog_reg_handle);
return (DDI_FAILURE);
}
break;
default:
cmn_err(CE_WARN, "pmugpio_map_regs: Invalid type");
return (DDI_FAILURE);
}
return (DDI_SUCCESS);
}