[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
Paul Mackerras
Родитель
fde5efd0e5
Коммит
0e8266437c
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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");
|
||||
|
|
@ -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 */
|
||||
Загрузка…
Ссылка в новой задаче