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Linux/arch/powerpc/sysdev/pmi.c

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  1 /*
  2  * pmi driver
  3  *
  4  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
  5  *
  6  * PMI (Platform Management Interrupt) is a way to communicate
  7  * with the BMC (Baseboard Management Controller) via interrupts.
  8  * Unlike IPMI it is bidirectional and has a low latency.
  9  *
 10  * Author: Christian Krafft <krafft@de.ibm.com>
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License as published by
 14  * the Free Software Foundation; either version 2, or (at your option)
 15  * any later version.
 16  *
 17  * This program is distributed in the hope that it will be useful,
 18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 20  * GNU General Public License for more details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 25  */
 26 
 27 #include <linux/interrupt.h>
 28 #include <linux/completion.h>
 29 #include <linux/spinlock.h>
 30 #include <linux/workqueue.h>
 31 #include <linux/of_device.h>
 32 #include <linux/of_platform.h>
 33 
 34 #include <asm/io.h>
 35 #include <asm/pmi.h>
 36 #include <asm/prom.h>
 37 
 38 struct pmi_data {
 39         struct list_head        handler;
 40         spinlock_t              handler_spinlock;
 41         spinlock_t              pmi_spinlock;
 42         struct mutex            msg_mutex;
 43         pmi_message_t           msg;
 44         struct completion       *completion;
 45         struct of_device        *dev;
 46         int                     irq;
 47         u8 __iomem              *pmi_reg;
 48         struct work_struct      work;
 49 };
 50 
 51 static struct pmi_data *data;
 52 
 53 static irqreturn_t pmi_irq_handler(int irq, void *dev_id)
 54 {
 55         u8 type;
 56         int rc;
 57 
 58         spin_lock(&data->pmi_spinlock);
 59 
 60         type = ioread8(data->pmi_reg + PMI_READ_TYPE);
 61         pr_debug("pmi: got message of type %d\n", type);
 62 
 63         if (type & PMI_ACK && !data->completion) {
 64                 printk(KERN_WARNING "pmi: got unexpected ACK message.\n");
 65                 rc = -EIO;
 66                 goto unlock;
 67         }
 68 
 69         if (data->completion && !(type & PMI_ACK)) {
 70                 printk(KERN_WARNING "pmi: expected ACK, but got %d\n", type);
 71                 rc = -EIO;
 72                 goto unlock;
 73         }
 74 
 75         data->msg.type = type;
 76         data->msg.data0 = ioread8(data->pmi_reg + PMI_READ_DATA0);
 77         data->msg.data1 = ioread8(data->pmi_reg + PMI_READ_DATA1);
 78         data->msg.data2 = ioread8(data->pmi_reg + PMI_READ_DATA2);
 79         rc = 0;
 80 unlock:
 81         spin_unlock(&data->pmi_spinlock);
 82 
 83         if (rc == -EIO) {
 84                 rc = IRQ_HANDLED;
 85                 goto out;
 86         }
 87 
 88         if (data->msg.type & PMI_ACK) {
 89                 complete(data->completion);
 90                 rc = IRQ_HANDLED;
 91                 goto out;
 92         }
 93 
 94         schedule_work(&data->work);
 95 
 96         rc = IRQ_HANDLED;
 97 out:
 98         return rc;
 99 }
100 
101 
102 static struct of_device_id pmi_match[] = {
103         { .type = "ibm,pmi", .name = "ibm,pmi" },
104         { .type = "ibm,pmi" },
105         {},
106 };
107 
108 MODULE_DEVICE_TABLE(of, pmi_match);
109 
110 static void pmi_notify_handlers(struct work_struct *work)
111 {
112         struct pmi_handler *handler;
113 
114         spin_lock(&data->handler_spinlock);
115         list_for_each_entry(handler, &data->handler, node) {
116                 pr_debug(KERN_INFO "pmi: notifying handler %p\n", handler);
117                 if (handler->type == data->msg.type)
118                         handler->handle_pmi_message(data->msg);
119         }
120         spin_unlock(&data->handler_spinlock);
121 }
122 
123 static int pmi_of_probe(struct of_device *dev,
124                         const struct of_device_id *match)
125 {
126         struct device_node *np = dev->node;
127         int rc;
128 
129         if (data) {
130                 printk(KERN_ERR "pmi: driver has already been initialized.\n");
131                 rc = -EBUSY;
132                 goto out;
133         }
134 
135         data = kzalloc(sizeof(struct pmi_data), GFP_KERNEL);
136         if (!data) {
137                 printk(KERN_ERR "pmi: could not allocate memory.\n");
138                 rc = -ENOMEM;
139                 goto out;
140         }
141 
142         data->pmi_reg = of_iomap(np, 0);
143         if (!data->pmi_reg) {
144                 printk(KERN_ERR "pmi: invalid register address.\n");
145                 rc = -EFAULT;
146                 goto error_cleanup_data;
147         }
148 
149         INIT_LIST_HEAD(&data->handler);
150 
151         mutex_init(&data->msg_mutex);
152         spin_lock_init(&data->pmi_spinlock);
153         spin_lock_init(&data->handler_spinlock);
154 
155         INIT_WORK(&data->work, pmi_notify_handlers);
156 
157         data->dev = dev;
158 
159         data->irq = irq_of_parse_and_map(np, 0);
160         if (data->irq == NO_IRQ) {
161                 printk(KERN_ERR "pmi: invalid interrupt.\n");
162                 rc = -EFAULT;
163                 goto error_cleanup_iomap;
164         }
165 
166         rc = request_irq(data->irq, pmi_irq_handler, 0, "pmi", NULL);
167         if (rc) {
168                 printk(KERN_ERR "pmi: can't request IRQ %d: returned %d\n",
169                                 data->irq, rc);
170                 goto error_cleanup_iomap;
171         }
172 
173         printk(KERN_INFO "pmi: found pmi device at addr %p.\n", data->pmi_reg);
174 
175         goto out;
176 
177 error_cleanup_iomap:
178         iounmap(data->pmi_reg);
179 
180 error_cleanup_data:
181         kfree(data);
182 
183 out:
184         return rc;
185 }
186 
187 static int pmi_of_remove(struct of_device *dev)
188 {
189         struct pmi_handler *handler, *tmp;
190 
191         free_irq(data->irq, NULL);
192         iounmap(data->pmi_reg);
193 
194         spin_lock(&data->handler_spinlock);
195 
196         list_for_each_entry_safe(handler, tmp, &data->handler, node)
197                 list_del(&handler->node);
198 
199         spin_unlock(&data->handler_spinlock);
200 
201         kfree(data);
202         data = NULL;
203 
204         return 0;
205 }
206 
207 static struct of_platform_driver pmi_of_platform_driver = {
208         .match_table    = pmi_match,
209         .probe          = pmi_of_probe,
210         .remove         = pmi_of_remove,
211         .driver         = {
212                 .name   = "pmi",
213         },
214 };
215 
216 static int __init pmi_module_init(void)
217 {
218         return of_register_platform_driver(&pmi_of_platform_driver);
219 }
220 module_init(pmi_module_init);
221 
222 static void __exit pmi_module_exit(void)
223 {
224         of_unregister_platform_driver(&pmi_of_platform_driver);
225 }
226 module_exit(pmi_module_exit);
227 
228 int pmi_send_message(pmi_message_t msg)
229 {
230         unsigned long flags;
231         DECLARE_COMPLETION_ONSTACK(completion);
232 
233         if (!data)
234                 return -ENODEV;
235 
236         mutex_lock(&data->msg_mutex);
237 
238         data->msg = msg;
239         pr_debug("pmi_send_message: msg is %08x\n", *(u32*)&msg);
240 
241         data->completion = &completion;
242 
243         spin_lock_irqsave(&data->pmi_spinlock, flags);
244         iowrite8(msg.data0, data->pmi_reg + PMI_WRITE_DATA0);
245         iowrite8(msg.data1, data->pmi_reg + PMI_WRITE_DATA1);
246         iowrite8(msg.data2, data->pmi_reg + PMI_WRITE_DATA2);
247         iowrite8(msg.type, data->pmi_reg + PMI_WRITE_TYPE);
248         spin_unlock_irqrestore(&data->pmi_spinlock, flags);
249 
250         pr_debug("pmi_send_message: wait for completion\n");
251 
252         wait_for_completion_interruptible_timeout(data->completion,
253                                                   PMI_TIMEOUT);
254 
255         data->completion = NULL;
256 
257         mutex_unlock(&data->msg_mutex);
258 
259         return 0;
260 }
261 EXPORT_SYMBOL_GPL(pmi_send_message);
262 
263 int pmi_register_handler(struct pmi_handler *handler)
264 {
265         if (!data)
266                 return -ENODEV;
267 
268         spin_lock(&data->handler_spinlock);
269         list_add_tail(&handler->node, &data->handler);
270         spin_unlock(&data->handler_spinlock);
271 
272         return 0;
273 }
274 EXPORT_SYMBOL_GPL(pmi_register_handler);
275 
276 void pmi_unregister_handler(struct pmi_handler *handler)
277 {
278         if (!data)
279                 return;
280 
281         pr_debug("pmi: unregistering handler %p\n", handler);
282 
283         spin_lock(&data->handler_spinlock);
284         list_del(&handler->node);
285         spin_unlock(&data->handler_spinlock);
286 }
287 EXPORT_SYMBOL_GPL(pmi_unregister_handler);
288 
289 MODULE_LICENSE("GPL");
290 MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
291 MODULE_DESCRIPTION("IBM Platform Management Interrupt driver");
292 

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