Subject: powerpc: add PMI driver for cell blade From: Christian Krafft 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 Signed-off-by: Arnd Bergmann --- Index: linux-2.6/arch/powerpc/Kconfig =================================================================== --- linux-2.6.orig/arch/powerpc/Kconfig +++ linux-2.6/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-2.6/arch/powerpc/sysdev/Makefile =================================================================== --- linux-2.6.orig/arch/powerpc/sysdev/Makefile +++ linux-2.6/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-2.6/arch/powerpc/sysdev/pmi.c =================================================================== --- /dev/null +++ linux-2.6/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 + * + * 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 +#include +#include + +#include +#include +#include +#include + +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 "); +MODULE_DESCRIPTION("IBM Platform Management Interrupt driver"); Index: linux-2.6/include/asm-powerpc/pmi.h =================================================================== --- /dev/null +++ linux-2.6/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 + * + * 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 + +#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 */