[POWERPC] Add PMI driver for cell blade

This adds driver code for the PMI device found in future IBM products.
PMI stands for "Platform Management Interrupt" and is a way to
communicate with the BMC (Baseboard Management Controller).
It provides bidirectional communication with a low latency.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Acked-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Acked-by: Heiko J Schick <schickhj@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Christian Krafft 2007-02-14 14:09:45 +01:00 committed by Paul Mackerras
parent fde5efd0e5
commit 0e8266437c
5 changed files with 383 additions and 0 deletions

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@ -620,6 +620,15 @@ config RTAS_FLASH
tristate "Firmware flash interface"
depends on PPC64 && RTAS_PROC
config PPC_PMI
tristate "Support for PMI"
depends PPC_IBM_CELL_BLADE
help
PMI (Platform Management Interrupt) is a way to
communicate with the BMC (Baseboard Mangement Controller).
It is used in some IBM Cell blades.
default m
config MMIO_NVRAM
bool
default n

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@ -147,6 +147,7 @@ CONFIG_PPC_RTAS=y
# CONFIG_RTAS_ERROR_LOGGING is not set
CONFIG_RTAS_PROC=y
CONFIG_RTAS_FLASH=y
CONFIG_PPC_PMI=m
CONFIG_MMIO_NVRAM=y
# CONFIG_PPC_MPC106 is not set
# CONFIG_PPC_970_NAP is not set

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@ -7,6 +7,7 @@ obj-$(CONFIG_PPC_INDIRECT_PCI) += indirect_pci.o
obj-$(CONFIG_PPC_MPC106) += grackle.o
obj-$(CONFIG_PPC_DCR) += dcr.o
obj-$(CONFIG_PPC_DCR_NATIVE) += dcr-low.o
obj-$(CONFIG_PPC_PMI) += pmi.o
obj-$(CONFIG_U3_DART) += dart_iommu.o
obj-$(CONFIG_MMIO_NVRAM) += mmio_nvram.o
obj-$(CONFIG_FSL_SOC) += fsl_soc.o

305
arch/powerpc/sysdev/pmi.c Normal file
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@ -0,0 +1,305 @@
/*
* pmi driver
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
*
* PMI (Platform Management Interrupt) is a way to communicate
* with the BMC (Baseboard Management Controller) via interrupts.
* Unlike IPMI it is bidirectional and has a low latency.
*
* Author: Christian Krafft <krafft@de.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <asm/of_device.h>
#include <asm/of_platform.h>
#include <asm/io.h>
#include <asm/pmi.h>
struct pmi_data {
struct list_head handler;
spinlock_t handler_spinlock;
spinlock_t pmi_spinlock;
struct mutex msg_mutex;
pmi_message_t msg;
struct completion *completion;
struct of_device *dev;
int irq;
u8 __iomem *pmi_reg;
struct work_struct work;
};
static void __iomem *of_iomap(struct device_node *np)
{
struct resource res;
if (of_address_to_resource(np, 0, &res))
return NULL;
pr_debug("Resource start: 0x%lx\n", res.start);
pr_debug("Resource end: 0x%lx\n", res.end);
return ioremap(res.start, 1 + res.end - res.start);
}
static int pmi_irq_handler(int irq, void *dev_id)
{
struct pmi_data *data;
u8 type;
int rc;
data = dev_id;
spin_lock(&data->pmi_spinlock);
type = ioread8(data->pmi_reg + PMI_READ_TYPE);
pr_debug("pmi: got message of type %d\n", type);
if (type & PMI_ACK && !data->completion) {
printk(KERN_WARNING "pmi: got unexpected ACK message.\n");
rc = -EIO;
goto unlock;
}
if (data->completion && !(type & PMI_ACK)) {
printk(KERN_WARNING "pmi: expected ACK, but got %d\n", type);
rc = -EIO;
goto unlock;
}
data->msg.type = type;
data->msg.data0 = ioread8(data->pmi_reg + PMI_READ_DATA0);
data->msg.data1 = ioread8(data->pmi_reg + PMI_READ_DATA1);
data->msg.data2 = ioread8(data->pmi_reg + PMI_READ_DATA2);
rc = 0;
unlock:
spin_unlock(&data->pmi_spinlock);
if (rc == -EIO) {
rc = IRQ_HANDLED;
goto out;
}
if (data->msg.type & PMI_ACK) {
complete(data->completion);
rc = IRQ_HANDLED;
goto out;
}
schedule_work(&data->work);
rc = IRQ_HANDLED;
out:
return rc;
}
static struct of_device_id pmi_match[] = {
{ .type = "ibm,pmi", .name = "ibm,pmi" },
{},
};
MODULE_DEVICE_TABLE(of, pmi_match);
static void pmi_notify_handlers(struct work_struct *work)
{
struct pmi_data *data;
struct pmi_handler *handler;
data = container_of(work, struct pmi_data, work);
spin_lock(&data->handler_spinlock);
list_for_each_entry(handler, &data->handler, node) {
pr_debug(KERN_INFO "pmi: notifying handler %p\n", handler);
if (handler->type == data->msg.type)
handler->handle_pmi_message(data->dev, data->msg);
}
spin_unlock(&data->handler_spinlock);
}
static int pmi_of_probe(struct of_device *dev,
const struct of_device_id *match)
{
struct device_node *np = dev->node;
struct pmi_data *data;
int rc;
data = kzalloc(sizeof(struct pmi_data), GFP_KERNEL);
if (!data) {
printk(KERN_ERR "pmi: could not allocate memory.\n");
rc = -ENOMEM;
goto out;
}
data->pmi_reg = of_iomap(np);
if (!data->pmi_reg) {
printk(KERN_ERR "pmi: invalid register address.\n");
rc = -EFAULT;
goto error_cleanup_data;
}
INIT_LIST_HEAD(&data->handler);
mutex_init(&data->msg_mutex);
spin_lock_init(&data->pmi_spinlock);
spin_lock_init(&data->handler_spinlock);
INIT_WORK(&data->work, pmi_notify_handlers);
dev->dev.driver_data = data;
data->dev = dev;
data->irq = irq_of_parse_and_map(np, 0);
if (data->irq == NO_IRQ) {
printk(KERN_ERR "pmi: invalid interrupt.\n");
rc = -EFAULT;
goto error_cleanup_iomap;
}
rc = request_irq(data->irq, pmi_irq_handler, 0, "pmi", data);
if (rc) {
printk(KERN_ERR "pmi: can't request IRQ %d: returned %d\n",
data->irq, rc);
goto error_cleanup_iomap;
}
printk(KERN_INFO "pmi: found pmi device at addr %p.\n", data->pmi_reg);
goto out;
error_cleanup_iomap:
iounmap(data->pmi_reg);
error_cleanup_data:
kfree(data);
out:
return rc;
}
static int pmi_of_remove(struct of_device *dev)
{
struct pmi_data *data;
struct pmi_handler *handler, *tmp;
data = dev->dev.driver_data;
free_irq(data->irq, data);
iounmap(data->pmi_reg);
spin_lock(&data->handler_spinlock);
list_for_each_entry_safe(handler, tmp, &data->handler, node)
list_del(&handler->node);
spin_unlock(&data->handler_spinlock);
kfree(dev->dev.driver_data);
return 0;
}
static struct of_platform_driver pmi_of_platform_driver = {
.name = "pmi",
.match_table = pmi_match,
.probe = pmi_of_probe,
.remove = pmi_of_remove
};
static int __init pmi_module_init(void)
{
return of_register_platform_driver(&pmi_of_platform_driver);
}
module_init(pmi_module_init);
static void __exit pmi_module_exit(void)
{
of_unregister_platform_driver(&pmi_of_platform_driver);
}
module_exit(pmi_module_exit);
void pmi_send_message(struct of_device *device, pmi_message_t msg)
{
struct pmi_data *data;
unsigned long flags;
DECLARE_COMPLETION_ONSTACK(completion);
data = device->dev.driver_data;
mutex_lock(&data->msg_mutex);
data->msg = msg;
pr_debug("pmi_send_message: msg is %08x\n", *(u32*)&msg);
data->completion = &completion;
spin_lock_irqsave(&data->pmi_spinlock, flags);
iowrite8(msg.data0, data->pmi_reg + PMI_WRITE_DATA0);
iowrite8(msg.data1, data->pmi_reg + PMI_WRITE_DATA1);
iowrite8(msg.data2, data->pmi_reg + PMI_WRITE_DATA2);
iowrite8(msg.type, data->pmi_reg + PMI_WRITE_TYPE);
spin_unlock_irqrestore(&data->pmi_spinlock, flags);
pr_debug("pmi_send_message: wait for completion\n");
wait_for_completion_interruptible_timeout(data->completion,
PMI_TIMEOUT);
data->completion = NULL;
mutex_unlock(&data->msg_mutex);
}
EXPORT_SYMBOL_GPL(pmi_send_message);
void pmi_register_handler(struct of_device *device,
struct pmi_handler *handler)
{
struct pmi_data *data;
data = device->dev.driver_data;
spin_lock(&data->handler_spinlock);
list_add_tail(&handler->node, &data->handler);
spin_unlock(&data->handler_spinlock);
}
EXPORT_SYMBOL_GPL(pmi_register_handler);
void pmi_unregister_handler(struct of_device *device,
struct pmi_handler *handler)
{
struct pmi_data *data;
pr_debug("pmi: unregistering handler %p\n", handler);
data = device->dev.driver_data;
spin_lock(&data->handler_spinlock);
list_del(&handler->node);
spin_unlock(&data->handler_spinlock);
}
EXPORT_SYMBOL_GPL(pmi_unregister_handler);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
MODULE_DESCRIPTION("IBM Platform Management Interrupt driver");

67
include/asm-powerpc/pmi.h Normal file
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@ -0,0 +1,67 @@
#ifndef _POWERPC_PMI_H
#define _POWERPC_PMI_H
/*
* Definitions for talking with PMI device on PowerPC
*
* PMI (Platform Management Interrupt) is a way to communicate
* with the BMC (Baseboard Management Controller) via interrupts.
* Unlike IPMI it is bidirectional and has a low latency.
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
*
* Author: Christian Krafft <krafft@de.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef __KERNEL__
#include <asm/of_device.h>
#define PMI_TYPE_FREQ_CHANGE 0x01
#define PMI_READ_TYPE 0
#define PMI_READ_DATA0 1
#define PMI_READ_DATA1 2
#define PMI_READ_DATA2 3
#define PMI_WRITE_TYPE 4
#define PMI_WRITE_DATA0 5
#define PMI_WRITE_DATA1 6
#define PMI_WRITE_DATA2 7
#define PMI_ACK 0x80
#define PMI_TIMEOUT 100
typedef struct {
u8 type;
u8 data0;
u8 data1;
u8 data2;
} pmi_message_t;
struct pmi_handler {
struct list_head node;
u8 type;
void (*handle_pmi_message) (struct of_device *, pmi_message_t);
};
void pmi_register_handler(struct of_device *, struct pmi_handler *);
void pmi_unregister_handler(struct of_device *, struct pmi_handler *);
void pmi_send_message(struct of_device *, pmi_message_t);
#endif /* __KERNEL__ */
#endif /* _POWERPC_PMI_H */