[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
parent
fde5efd0e5
commit
0e8266437c
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@ -620,6 +620,15 @@ config RTAS_FLASH
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tristate "Firmware flash interface"
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depends on PPC64 && RTAS_PROC
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config PPC_PMI
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tristate "Support for PMI"
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depends PPC_IBM_CELL_BLADE
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help
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PMI (Platform Management Interrupt) is a way to
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communicate with the BMC (Baseboard Mangement Controller).
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It is used in some IBM Cell blades.
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default m
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config MMIO_NVRAM
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bool
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default n
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@ -147,6 +147,7 @@ CONFIG_PPC_RTAS=y
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# CONFIG_RTAS_ERROR_LOGGING is not set
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CONFIG_RTAS_PROC=y
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CONFIG_RTAS_FLASH=y
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CONFIG_PPC_PMI=m
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CONFIG_MMIO_NVRAM=y
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# CONFIG_PPC_MPC106 is not set
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# CONFIG_PPC_970_NAP is not set
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@ -7,6 +7,7 @@ obj-$(CONFIG_PPC_INDIRECT_PCI) += indirect_pci.o
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obj-$(CONFIG_PPC_MPC106) += grackle.o
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obj-$(CONFIG_PPC_DCR) += dcr.o
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obj-$(CONFIG_PPC_DCR_NATIVE) += dcr-low.o
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obj-$(CONFIG_PPC_PMI) += pmi.o
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obj-$(CONFIG_U3_DART) += dart_iommu.o
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obj-$(CONFIG_MMIO_NVRAM) += mmio_nvram.o
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obj-$(CONFIG_FSL_SOC) += fsl_soc.o
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@ -0,0 +1,305 @@
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/*
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* pmi driver
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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*
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* PMI (Platform Management Interrupt) is a way to communicate
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* with the BMC (Baseboard Management Controller) via interrupts.
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* Unlike IPMI it is bidirectional and has a low latency.
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/interrupt.h>
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#include <linux/completion.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <asm/of_device.h>
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#include <asm/of_platform.h>
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#include <asm/io.h>
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#include <asm/pmi.h>
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struct pmi_data {
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struct list_head handler;
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spinlock_t handler_spinlock;
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spinlock_t pmi_spinlock;
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struct mutex msg_mutex;
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pmi_message_t msg;
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struct completion *completion;
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struct of_device *dev;
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int irq;
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u8 __iomem *pmi_reg;
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struct work_struct work;
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};
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static void __iomem *of_iomap(struct device_node *np)
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{
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struct resource res;
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if (of_address_to_resource(np, 0, &res))
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return NULL;
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pr_debug("Resource start: 0x%lx\n", res.start);
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pr_debug("Resource end: 0x%lx\n", res.end);
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return ioremap(res.start, 1 + res.end - res.start);
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}
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static int pmi_irq_handler(int irq, void *dev_id)
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{
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struct pmi_data *data;
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u8 type;
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int rc;
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data = dev_id;
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spin_lock(&data->pmi_spinlock);
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type = ioread8(data->pmi_reg + PMI_READ_TYPE);
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pr_debug("pmi: got message of type %d\n", type);
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if (type & PMI_ACK && !data->completion) {
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printk(KERN_WARNING "pmi: got unexpected ACK message.\n");
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rc = -EIO;
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goto unlock;
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}
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if (data->completion && !(type & PMI_ACK)) {
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printk(KERN_WARNING "pmi: expected ACK, but got %d\n", type);
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rc = -EIO;
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goto unlock;
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}
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data->msg.type = type;
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data->msg.data0 = ioread8(data->pmi_reg + PMI_READ_DATA0);
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data->msg.data1 = ioread8(data->pmi_reg + PMI_READ_DATA1);
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data->msg.data2 = ioread8(data->pmi_reg + PMI_READ_DATA2);
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rc = 0;
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unlock:
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spin_unlock(&data->pmi_spinlock);
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if (rc == -EIO) {
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rc = IRQ_HANDLED;
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goto out;
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}
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if (data->msg.type & PMI_ACK) {
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complete(data->completion);
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rc = IRQ_HANDLED;
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goto out;
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}
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schedule_work(&data->work);
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rc = IRQ_HANDLED;
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out:
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return rc;
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}
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static struct of_device_id pmi_match[] = {
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{ .type = "ibm,pmi", .name = "ibm,pmi" },
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{},
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};
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MODULE_DEVICE_TABLE(of, pmi_match);
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static void pmi_notify_handlers(struct work_struct *work)
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{
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struct pmi_data *data;
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struct pmi_handler *handler;
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data = container_of(work, struct pmi_data, work);
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spin_lock(&data->handler_spinlock);
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list_for_each_entry(handler, &data->handler, node) {
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pr_debug(KERN_INFO "pmi: notifying handler %p\n", handler);
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if (handler->type == data->msg.type)
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handler->handle_pmi_message(data->dev, data->msg);
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}
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spin_unlock(&data->handler_spinlock);
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}
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static int pmi_of_probe(struct of_device *dev,
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const struct of_device_id *match)
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{
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struct device_node *np = dev->node;
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struct pmi_data *data;
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int rc;
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data = kzalloc(sizeof(struct pmi_data), GFP_KERNEL);
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if (!data) {
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printk(KERN_ERR "pmi: could not allocate memory.\n");
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rc = -ENOMEM;
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goto out;
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}
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data->pmi_reg = of_iomap(np);
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if (!data->pmi_reg) {
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printk(KERN_ERR "pmi: invalid register address.\n");
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rc = -EFAULT;
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goto error_cleanup_data;
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}
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INIT_LIST_HEAD(&data->handler);
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mutex_init(&data->msg_mutex);
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spin_lock_init(&data->pmi_spinlock);
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spin_lock_init(&data->handler_spinlock);
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INIT_WORK(&data->work, pmi_notify_handlers);
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dev->dev.driver_data = data;
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data->dev = dev;
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data->irq = irq_of_parse_and_map(np, 0);
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if (data->irq == NO_IRQ) {
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printk(KERN_ERR "pmi: invalid interrupt.\n");
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rc = -EFAULT;
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goto error_cleanup_iomap;
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}
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rc = request_irq(data->irq, pmi_irq_handler, 0, "pmi", data);
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if (rc) {
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printk(KERN_ERR "pmi: can't request IRQ %d: returned %d\n",
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data->irq, rc);
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goto error_cleanup_iomap;
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}
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printk(KERN_INFO "pmi: found pmi device at addr %p.\n", data->pmi_reg);
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goto out;
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error_cleanup_iomap:
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iounmap(data->pmi_reg);
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error_cleanup_data:
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kfree(data);
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out:
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return rc;
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}
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static int pmi_of_remove(struct of_device *dev)
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{
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struct pmi_data *data;
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struct pmi_handler *handler, *tmp;
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data = dev->dev.driver_data;
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free_irq(data->irq, data);
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iounmap(data->pmi_reg);
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spin_lock(&data->handler_spinlock);
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list_for_each_entry_safe(handler, tmp, &data->handler, node)
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list_del(&handler->node);
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spin_unlock(&data->handler_spinlock);
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kfree(dev->dev.driver_data);
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return 0;
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}
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static struct of_platform_driver pmi_of_platform_driver = {
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.name = "pmi",
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.match_table = pmi_match,
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.probe = pmi_of_probe,
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.remove = pmi_of_remove
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};
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static int __init pmi_module_init(void)
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{
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return of_register_platform_driver(&pmi_of_platform_driver);
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}
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module_init(pmi_module_init);
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static void __exit pmi_module_exit(void)
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{
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of_unregister_platform_driver(&pmi_of_platform_driver);
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}
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module_exit(pmi_module_exit);
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void pmi_send_message(struct of_device *device, pmi_message_t msg)
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{
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struct pmi_data *data;
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unsigned long flags;
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DECLARE_COMPLETION_ONSTACK(completion);
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data = device->dev.driver_data;
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mutex_lock(&data->msg_mutex);
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data->msg = msg;
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pr_debug("pmi_send_message: msg is %08x\n", *(u32*)&msg);
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data->completion = &completion;
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spin_lock_irqsave(&data->pmi_spinlock, flags);
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iowrite8(msg.data0, data->pmi_reg + PMI_WRITE_DATA0);
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iowrite8(msg.data1, data->pmi_reg + PMI_WRITE_DATA1);
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iowrite8(msg.data2, data->pmi_reg + PMI_WRITE_DATA2);
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iowrite8(msg.type, data->pmi_reg + PMI_WRITE_TYPE);
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spin_unlock_irqrestore(&data->pmi_spinlock, flags);
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pr_debug("pmi_send_message: wait for completion\n");
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wait_for_completion_interruptible_timeout(data->completion,
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PMI_TIMEOUT);
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data->completion = NULL;
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mutex_unlock(&data->msg_mutex);
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}
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EXPORT_SYMBOL_GPL(pmi_send_message);
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void pmi_register_handler(struct of_device *device,
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struct pmi_handler *handler)
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{
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struct pmi_data *data;
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data = device->dev.driver_data;
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spin_lock(&data->handler_spinlock);
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list_add_tail(&handler->node, &data->handler);
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spin_unlock(&data->handler_spinlock);
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}
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EXPORT_SYMBOL_GPL(pmi_register_handler);
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void pmi_unregister_handler(struct of_device *device,
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struct pmi_handler *handler)
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{
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struct pmi_data *data;
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pr_debug("pmi: unregistering handler %p\n", handler);
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data = device->dev.driver_data;
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spin_lock(&data->handler_spinlock);
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list_del(&handler->node);
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spin_unlock(&data->handler_spinlock);
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}
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EXPORT_SYMBOL_GPL(pmi_unregister_handler);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
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MODULE_DESCRIPTION("IBM Platform Management Interrupt driver");
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@ -0,0 +1,67 @@
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#ifndef _POWERPC_PMI_H
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#define _POWERPC_PMI_H
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/*
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* Definitions for talking with PMI device on PowerPC
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*
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* PMI (Platform Management Interrupt) is a way to communicate
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* with the BMC (Baseboard Management Controller) via interrupts.
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* Unlike IPMI it is bidirectional and has a low latency.
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifdef __KERNEL__
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#include <asm/of_device.h>
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#define PMI_TYPE_FREQ_CHANGE 0x01
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#define PMI_READ_TYPE 0
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#define PMI_READ_DATA0 1
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#define PMI_READ_DATA1 2
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#define PMI_READ_DATA2 3
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#define PMI_WRITE_TYPE 4
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#define PMI_WRITE_DATA0 5
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#define PMI_WRITE_DATA1 6
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#define PMI_WRITE_DATA2 7
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#define PMI_ACK 0x80
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#define PMI_TIMEOUT 100
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typedef struct {
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u8 type;
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u8 data0;
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u8 data1;
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u8 data2;
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} pmi_message_t;
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struct pmi_handler {
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struct list_head node;
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u8 type;
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void (*handle_pmi_message) (struct of_device *, pmi_message_t);
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};
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void pmi_register_handler(struct of_device *, struct pmi_handler *);
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void pmi_unregister_handler(struct of_device *, struct pmi_handler *);
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void pmi_send_message(struct of_device *, pmi_message_t);
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#endif /* __KERNEL__ */
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#endif /* _POWERPC_PMI_H */
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