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![Michael Ellerman](/assets/img/avatar_default.png)
NO_IRQ has been == 0 on powerpc for just over ten years (since commit
0ebfff1491
("[POWERPC] Add new interrupt mapping core and change
platforms to use it")). It's also 0 on most other arches.
Although it's fairly harmless, every now and then it causes confusion
when a driver is built on powerpc and another arch which doesn't define
NO_IRQ. There's at least 6 definitions of NO_IRQ in drivers/, at least
some of which are to work around that problem.
So we'd like to remove it. This is fairly trivial in the arch code, we
just convert:
if (irq == NO_IRQ) to if (!irq)
if (irq != NO_IRQ) to if (irq)
irq = NO_IRQ; to irq = 0;
return NO_IRQ; to return 0;
And a few other odd cases as well.
At least for now we keep the #define NO_IRQ, because there is driver
code that uses NO_IRQ and the fixes to remove those will go via other
trees.
Note we also change some occurrences in PPC sound drivers, drivers/ps3,
and drivers/macintosh.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
281 lines
6.4 KiB
C
281 lines
6.4 KiB
C
/*
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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/slab.h>
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#include <linux/completion.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <asm/io.h>
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#include <asm/pmi.h>
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#include <asm/prom.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 platform_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 struct pmi_data *data;
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static irqreturn_t pmi_irq_handler(int irq, void *dev_id)
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{
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u8 type;
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int rc;
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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 const struct of_device_id pmi_match[] = {
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{ .type = "ibm,pmi", .name = "ibm,pmi" },
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{ .type = "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_handler *handler;
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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("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->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 platform_device *dev)
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{
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struct device_node *np = dev->dev.of_node;
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int rc;
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if (data) {
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printk(KERN_ERR "pmi: driver has already been initialized.\n");
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rc = -EBUSY;
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goto out;
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}
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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, 0);
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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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data->dev = dev;
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data->irq = irq_of_parse_and_map(np, 0);
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if (!data->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", NULL);
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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 platform_device *dev)
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{
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struct pmi_handler *handler, *tmp;
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free_irq(data->irq, NULL);
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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(data);
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data = NULL;
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return 0;
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}
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static struct platform_driver pmi_of_platform_driver = {
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.probe = pmi_of_probe,
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.remove = pmi_of_remove,
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.driver = {
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.name = "pmi",
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.of_match_table = pmi_match,
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},
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};
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module_platform_driver(pmi_of_platform_driver);
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int pmi_send_message(pmi_message_t msg)
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{
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unsigned long flags;
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DECLARE_COMPLETION_ONSTACK(completion);
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if (!data)
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return -ENODEV;
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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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return 0;
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}
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EXPORT_SYMBOL_GPL(pmi_send_message);
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int pmi_register_handler(struct pmi_handler *handler)
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{
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if (!data)
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return -ENODEV;
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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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return 0;
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}
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EXPORT_SYMBOL_GPL(pmi_register_handler);
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void pmi_unregister_handler(struct pmi_handler *handler)
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{
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if (!data)
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return;
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pr_debug("pmi: unregistering handler %p\n", handler);
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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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