[Cbe-oss-dev] [patch 1/1] pmi: initial version
Christian Krafft
krafft at de.ibm.com
Sat Feb 10 04:45:30 EST 2007
This patch 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. It provides bidirectional communication with a low latency.
Signed-off-by: Christian Krafft <krafft at de.ibm.com>
Index: linux/arch/powerpc/Kconfig
===================================================================
--- linux.orig/arch/powerpc/Kconfig
+++ linux/arch/powerpc/Kconfig
@@ -524,6 +524,7 @@ config PPC_IBM_CELL_BLADE
select MMIO_NVRAM
select PPC_UDBG_16550
select UDBG_RTAS_CONSOLE
+# select PPC_PMI
config PPC_PS3
bool "Sony PS3 (incomplete)"
@@ -577,6 +578,14 @@ 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 is a way to communicate with the board mangement controller.
+ It is used in some IBM Cell blades.
+ default m
+
config MMIO_NVRAM
bool
default n
Index: linux/arch/powerpc/sysdev/Makefile
===================================================================
--- linux.orig/arch/powerpc/sysdev/Makefile
+++ linux/arch/powerpc/sysdev/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_PPC_INDIRECT_PCI) += indire
obj-$(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
Index: linux/arch/powerpc/sysdev/pmi.c
===================================================================
--- /dev/null
+++ linux/arch/powerpc/sysdev/pmi.c
@@ -0,0 +1,275 @@
+/*
+ * pmi driver
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
+ *
+ * PMI is a way to communicate with the BMC via interrupts.
+ * Unlike IPMI it is bidirectional and has a low latency.
+ *
+ * Author: Christian Krafft <krafft at 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 <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;
+ struct pmi_message *msg;
+ struct completion *completion;
+ struct of_device *dev;
+ int irq;
+ u8 __iomem *pmi_reg;
+};
+
+
+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;
+ int type;
+ struct pmi_handler *handler;
+
+ data = dev_id;
+
+ BUG_ON(!data);
+
+ pr_debug("pmi: got a PMI message\n");
+
+ spin_lock(&data->pmi_spinlock);
+ type = ioread8(data->pmi_reg + PMI_READ_TYPE);
+ spin_unlock(&data->pmi_spinlock);
+
+ pr_debug("pmi: message type is %d\n", type);
+
+ if (type & PMI_ACK) {
+ BUG_ON(!data->msg);
+ BUG_ON(!data->completion);
+ pr_debug("pmi: got an ACK\n");
+ 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);
+ complete(data->completion);
+ return IRQ_HANDLED;
+ }
+
+ spin_lock(&data->handler_spinlock);
+ list_for_each_entry(handler, &data->handler, node) {
+ pr_debug("pmi: notifying handlers\n");
+ if (handler->type == type) {
+ pr_debug("pmi: notify handler %p\n", handler);
+ handler->handle_pmi_message(data->dev, data->msg);
+ }
+ }
+ spin_unlock(&data->handler_spinlock);
+
+ return IRQ_HANDLED;
+}
+
+
+static struct of_device_id pmi_match[] = {
+ { .type = "ibm,pmi", .name = "pmi" },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, pmi_match);
+
+static int pmi_of_probe(struct of_device *dev,
+ const struct of_device_id *match)
+{
+ DEFINE_SPINLOCK(handler_spinlock);
+ DEFINE_SPINLOCK(pmi_spinlock);
+
+ 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");
+ return -EFAULT;
+ }
+
+ data->pmi_reg = of_iomap(np);
+
+ if (!data->pmi_reg) {
+ printk(KERN_ERR "pmi: invalid register address.\n");
+ kfree(data);
+ return -EFAULT;
+ }
+
+ INIT_LIST_HEAD(&data->handler);
+
+ data->irq = irq_of_parse_and_map(np, 0);
+ if (data->irq == NO_IRQ) {
+ printk(KERN_ERR "pmi: invalid interrupt.\n");
+ iounmap(data->pmi_reg);
+ kfree(data);
+ return -EFAULT;
+ }
+
+ data->handler_spinlock = handler_spinlock;
+ data->pmi_spinlock = pmi_spinlock;
+
+ rc = request_irq(data->irq, pmi_irq_handler,
+ IRQF_SHARED, "pmi", data);
+ if (rc) {
+ printk(KERN_ERR "pmi: can't request IRQ %d: returned %d\n",
+ data->irq, rc);
+ iounmap(data->pmi_reg);
+ kfree(data);
+ return -EFAULT;
+ }
+
+ dev->dev.driver_data = data;
+ data->dev = dev;
+
+ printk(KERN_INFO "pmi: found pmi device at address %p.\n", data->pmi_reg);
+
+ return 0;
+}
+
+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_irq(&data->handler_spinlock);
+
+ list_for_each_entry_safe(handler, tmp, &data->handler, node)
+ list_del(&handler->node);
+
+ spin_unlock_irq(&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, struct pmi_message *msg)
+{
+ struct pmi_data *data;
+ unsigned long flags;
+ DECLARE_COMPLETION_ONSTACK(completion);
+
+ BUG_ON(!device || !msg);
+
+ data = device->dev.driver_data;
+ pr_debug("pmi_send_message: data is %p\n", data);
+
+ mutex_lock(&data->msg_mutex);
+
+ data->msg = msg;
+
+ pr_debug("pmi_send_message: msg is %p\n", 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(KERN_INFO "pmi_send_message: wait for completion %p\n", data->completion);
+
+ wait_for_completion_interruptible_timeout(data->completion, PMI_TIMEOUT);
+
+ data->msg = NULL;
+ 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;
+
+ pr_debug("pmi: registering handler %p\n", handler);
+
+ data = device->dev.driver_data;
+
+ spin_lock_irq(&data->handler_spinlock);
+ list_add_tail(&handler->node, &data->handler);
+ spin_unlock_irq(&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_irq(&data->handler_spinlock);
+ list_del(&handler->node);
+ spin_unlock_irq(&data->handler_spinlock);
+}
+EXPORT_SYMBOL_GPL(pmi_unregister_handler);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Krafft <krafft at de.ibm.com>");
+MODULE_DESCRIPTION("IBM Platform Management Interrupt driver");
Index: linux/include/asm-powerpc/pmi.h
===================================================================
--- /dev/null
+++ linux/include/asm-powerpc/pmi.h
@@ -0,0 +1,63 @@
+#ifndef _POWERPC_PMI_H
+#define _POWERPC_PMI_H
+
+/*
+ * Definitions for talking with PMI device on PowerPC
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
+ *
+ * Author: Christian Krafft <krafft at 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
+
+struct pmi_message {
+ u8 type;
+ u8 data0;
+ u8 data1;
+ u8 data2;
+};
+
+struct pmi_handler {
+ struct list_head node;
+ u8 type;
+ void (*handle_pmi_message) (struct of_device *, struct pmi_message *);
+};
+
+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 *, struct pmi_message *);
+
+#endif /* __KERNEL__ */
+#endif /* _POWERPC_PMI_H */
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