[PATCH] IPoIB: Don't flush workqueue from within workqueue
[linux-2.6] / drivers / scsi / aacraid / rx.c
1 /*
2  *      Adaptec AAC series RAID controller driver
3  *      (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
4  *
5  * based on the old aacraid driver that is..
6  * Adaptec aacraid device driver for Linux.
7  *
8  * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2, or (at your option)
13  * any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; see the file COPYING.  If not, write to
22  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23  *
24  * Module Name:
25  *  rx.c
26  *
27  * Abstract: Hardware miniport for Drawbridge specific hardware functions.
28  *
29  */
30
31 #include <linux/kernel.h>
32 #include <linux/init.h>
33 #include <linux/types.h>
34 #include <linux/sched.h>
35 #include <linux/pci.h>
36 #include <linux/spinlock.h>
37 #include <linux/slab.h>
38 #include <linux/blkdev.h>
39 #include <linux/delay.h>
40 #include <linux/completion.h>
41 #include <linux/time.h>
42 #include <linux/interrupt.h>
43 #include <asm/semaphore.h>
44
45 #include <scsi/scsi_host.h>
46
47 #include "aacraid.h"
48
49 static irqreturn_t aac_rx_intr(int irq, void *dev_id, struct pt_regs *regs)
50 {
51         struct aac_dev *dev = dev_id;
52         unsigned long bellbits;
53         u8 intstat, mask;
54         intstat = rx_readb(dev, MUnit.OISR);
55         /*
56          *      Read mask and invert because drawbridge is reversed.
57          *      This allows us to only service interrupts that have 
58          *      been enabled.
59          */
60         mask = ~(dev->OIMR);
61         /* Check to see if this is our interrupt.  If it isn't just return */
62         if (intstat & mask) 
63         {
64                 bellbits = rx_readl(dev, OutboundDoorbellReg);
65                 if (bellbits & DoorBellPrintfReady) {
66                         aac_printf(dev, rx_readl(dev, IndexRegs.Mailbox[5]));
67                         rx_writel(dev, MUnit.ODR,DoorBellPrintfReady);
68                         rx_writel(dev, InboundDoorbellReg,DoorBellPrintfDone);
69                 }
70                 else if (bellbits & DoorBellAdapterNormCmdReady) {
71                         rx_writel(dev, MUnit.ODR, DoorBellAdapterNormCmdReady);
72                         aac_command_normal(&dev->queues->queue[HostNormCmdQueue]);
73                 }
74                 else if (bellbits & DoorBellAdapterNormRespReady) {
75                         aac_response_normal(&dev->queues->queue[HostNormRespQueue]);
76                         rx_writel(dev, MUnit.ODR,DoorBellAdapterNormRespReady);
77                 }
78                 else if (bellbits & DoorBellAdapterNormCmdNotFull) {
79                         rx_writel(dev, MUnit.ODR, DoorBellAdapterNormCmdNotFull);
80                 }
81                 else if (bellbits & DoorBellAdapterNormRespNotFull) {
82                         rx_writel(dev, MUnit.ODR, DoorBellAdapterNormCmdNotFull);
83                         rx_writel(dev, MUnit.ODR, DoorBellAdapterNormRespNotFull);
84                 }
85                 return IRQ_HANDLED;
86         }
87         return IRQ_NONE;
88 }
89
90 /**
91  *      aac_rx_disable_interrupt        -       Disable interrupts
92  *      @dev: Adapter
93  */
94
95 static void aac_rx_disable_interrupt(struct aac_dev *dev)
96 {
97         rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xff);
98 }
99
100 /**
101  *      rx_sync_cmd     -       send a command and wait
102  *      @dev: Adapter
103  *      @command: Command to execute
104  *      @p1: first parameter
105  *      @ret: adapter status
106  *
107  *      This routine will send a synchronous command to the adapter and wait 
108  *      for its completion.
109  */
110
111 static int rx_sync_cmd(struct aac_dev *dev, u32 command,
112         u32 p1, u32 p2, u32 p3, u32 p4, u32 p5, u32 p6,
113         u32 *status, u32 * r1, u32 * r2, u32 * r3, u32 * r4)
114 {
115         unsigned long start;
116         int ok;
117         /*
118          *      Write the command into Mailbox 0
119          */
120         rx_writel(dev, InboundMailbox0, command);
121         /*
122          *      Write the parameters into Mailboxes 1 - 6
123          */
124         rx_writel(dev, InboundMailbox1, p1);
125         rx_writel(dev, InboundMailbox2, p2);
126         rx_writel(dev, InboundMailbox3, p3);
127         rx_writel(dev, InboundMailbox4, p4);
128         /*
129          *      Clear the synch command doorbell to start on a clean slate.
130          */
131         rx_writel(dev, OutboundDoorbellReg, OUTBOUNDDOORBELL_0);
132         /*
133          *      Disable doorbell interrupts
134          */
135         rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xff);
136         /*
137          *      Force the completion of the mask register write before issuing
138          *      the interrupt.
139          */
140         rx_readb (dev, MUnit.OIMR);
141         /*
142          *      Signal that there is a new synch command
143          */
144         rx_writel(dev, InboundDoorbellReg, INBOUNDDOORBELL_0);
145
146         ok = 0;
147         start = jiffies;
148
149         /*
150          *      Wait up to 30 seconds
151          */
152         while (time_before(jiffies, start+30*HZ)) 
153         {
154                 udelay(5);      /* Delay 5 microseconds to let Mon960 get info. */
155                 /*
156                  *      Mon960 will set doorbell0 bit when it has completed the command.
157                  */
158                 if (rx_readl(dev, OutboundDoorbellReg) & OUTBOUNDDOORBELL_0) {
159                         /*
160                          *      Clear the doorbell.
161                          */
162                         rx_writel(dev, OutboundDoorbellReg, OUTBOUNDDOORBELL_0);
163                         ok = 1;
164                         break;
165                 }
166                 /*
167                  *      Yield the processor in case we are slow 
168                  */
169                 set_current_state(TASK_UNINTERRUPTIBLE);
170                 schedule_timeout(1);
171         }
172         if (ok != 1) {
173                 /*
174                  *      Restore interrupt mask even though we timed out
175                  */
176                 rx_writeb(dev, MUnit.OIMR, dev->OIMR &= 0xfb);
177                 return -ETIMEDOUT;
178         }
179         /*
180          *      Pull the synch status from Mailbox 0.
181          */
182         if (status)
183                 *status = rx_readl(dev, IndexRegs.Mailbox[0]);
184         if (r1)
185                 *r1 = rx_readl(dev, IndexRegs.Mailbox[1]);
186         if (r2)
187                 *r2 = rx_readl(dev, IndexRegs.Mailbox[2]);
188         if (r3)
189                 *r3 = rx_readl(dev, IndexRegs.Mailbox[3]);
190         if (r4)
191                 *r4 = rx_readl(dev, IndexRegs.Mailbox[4]);
192         /*
193          *      Clear the synch command doorbell.
194          */
195         rx_writel(dev, OutboundDoorbellReg, OUTBOUNDDOORBELL_0);
196         /*
197          *      Restore interrupt mask
198          */
199         rx_writeb(dev, MUnit.OIMR, dev->OIMR &= 0xfb);
200         return 0;
201
202 }
203
204 /**
205  *      aac_rx_interrupt_adapter        -       interrupt adapter
206  *      @dev: Adapter
207  *
208  *      Send an interrupt to the i960 and breakpoint it.
209  */
210
211 static void aac_rx_interrupt_adapter(struct aac_dev *dev)
212 {
213         rx_sync_cmd(dev, BREAKPOINT_REQUEST, 0, 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL);
214 }
215
216 /**
217  *      aac_rx_notify_adapter           -       send an event to the adapter
218  *      @dev: Adapter
219  *      @event: Event to send
220  *
221  *      Notify the i960 that something it probably cares about has
222  *      happened.
223  */
224
225 static void aac_rx_notify_adapter(struct aac_dev *dev, u32 event)
226 {
227         switch (event) {
228
229         case AdapNormCmdQue:
230                 rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_1);
231                 break;
232         case HostNormRespNotFull:
233                 rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_4);
234                 break;
235         case AdapNormRespQue:
236                 rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_2);
237                 break;
238         case HostNormCmdNotFull:
239                 rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_3);
240                 break;
241         case HostShutdown:
242 //              rx_sync_cmd(dev, HOST_CRASHING, 0, 0, 0, 0, 0, 0,
243 //                NULL, NULL, NULL, NULL, NULL);
244                 break;
245         case FastIo:
246                 rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_6);
247                 break;
248         case AdapPrintfDone:
249                 rx_writel(dev, MUnit.IDR,INBOUNDDOORBELL_5);
250                 break;
251         default:
252                 BUG();
253                 break;
254         }
255 }
256
257 /**
258  *      aac_rx_start_adapter            -       activate adapter
259  *      @dev:   Adapter
260  *
261  *      Start up processing on an i960 based AAC adapter
262  */
263
264 static void aac_rx_start_adapter(struct aac_dev *dev)
265 {
266         struct aac_init *init;
267
268         init = dev->init;
269         init->HostElapsedSeconds = cpu_to_le32(get_seconds());
270         /*
271          *      First clear out all interrupts.  Then enable the one's that we
272          *      can handle.
273          */
274         rx_writeb(dev, MUnit.OIMR, 0xff);
275         rx_writel(dev, MUnit.ODR, 0xffffffff);
276 //      rx_writeb(dev, MUnit.OIMR, ~(u8)OUTBOUND_DOORBELL_INTERRUPT_MASK);
277         rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xfb);
278
279         // We can only use a 32 bit address here
280         rx_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, (u32)(ulong)dev->init_pa,
281           0, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL);
282 }
283
284 /**
285  *      aac_rx_check_health
286  *      @dev: device to check if healthy
287  *
288  *      Will attempt to determine if the specified adapter is alive and
289  *      capable of handling requests, returning 0 if alive.
290  */
291 static int aac_rx_check_health(struct aac_dev *dev)
292 {
293         u32 status = rx_readl(dev, MUnit.OMRx[0]);
294
295         /*
296          *      Check to see if the board failed any self tests.
297          */
298         if (status & SELF_TEST_FAILED)
299                 return -1;
300         /*
301          *      Check to see if the board panic'd.
302          */
303         if (status & KERNEL_PANIC) {
304                 char * buffer;
305                 struct POSTSTATUS {
306                         __le32 Post_Command;
307                         __le32 Post_Address;
308                 } * post;
309                 dma_addr_t paddr, baddr;
310                 int ret;
311
312                 if ((status & 0xFF000000L) == 0xBC000000L)
313                         return (status >> 16) & 0xFF;
314                 buffer = pci_alloc_consistent(dev->pdev, 512, &baddr);
315                 ret = -2;
316                 if (buffer == NULL)
317                         return ret;
318                 post = pci_alloc_consistent(dev->pdev,
319                   sizeof(struct POSTSTATUS), &paddr);
320                 if (post == NULL) {
321                         pci_free_consistent(dev->pdev, 512, buffer, baddr);
322                         return ret;
323                 }
324                 memset(buffer, 0, 512);
325                 post->Post_Command = cpu_to_le32(COMMAND_POST_RESULTS);
326                 post->Post_Address = cpu_to_le32(baddr);
327                 rx_writel(dev, MUnit.IMRx[0], paddr);
328                 rx_sync_cmd(dev, COMMAND_POST_RESULTS, baddr, 0, 0, 0, 0, 0,
329                   NULL, NULL, NULL, NULL, NULL);
330                 pci_free_consistent(dev->pdev, sizeof(struct POSTSTATUS),
331                   post, paddr);
332                 if ((buffer[0] == '0') && (buffer[1] == 'x')) {
333                         ret = (buffer[2] <= '9') ? (buffer[2] - '0') : (buffer[2] - 'A' + 10);
334                         ret <<= 4;
335                         ret += (buffer[3] <= '9') ? (buffer[3] - '0') : (buffer[3] - 'A' + 10);
336                 }
337                 pci_free_consistent(dev->pdev, 512, buffer, baddr);
338                 return ret;
339         }
340         /*
341          *      Wait for the adapter to be up and running.
342          */
343         if (!(status & KERNEL_UP_AND_RUNNING))
344                 return -3;
345         /*
346          *      Everything is OK
347          */
348         return 0;
349 }
350
351 /**
352  *      aac_rx_init     -       initialize an i960 based AAC card
353  *      @dev: device to configure
354  *
355  *      Allocate and set up resources for the i960 based AAC variants. The 
356  *      device_interface in the commregion will be allocated and linked 
357  *      to the comm region.
358  */
359
360 int aac_rx_init(struct aac_dev *dev)
361 {
362         unsigned long start;
363         unsigned long status;
364         int instance;
365         const char * name;
366
367         instance = dev->id;
368         name     = dev->name;
369
370         /*
371          *      Map in the registers from the adapter.
372          */
373         if((dev->regs.rx = ioremap((unsigned long)dev->scsi_host_ptr->base, 8192))==NULL)
374         {       
375                 printk(KERN_WARNING "aacraid: unable to map i960.\n" );
376                 return -1;
377         }
378         /*
379          *      Check to see if the board failed any self tests.
380          */
381         if (rx_readl(dev, MUnit.OMRx[0]) & SELF_TEST_FAILED) {
382                 printk(KERN_ERR "%s%d: adapter self-test failed.\n", dev->name, instance);
383                 goto error_iounmap;
384         }
385         /*
386          *      Check to see if the board panic'd while booting.
387          */
388         if (rx_readl(dev, MUnit.OMRx[0]) & KERNEL_PANIC) {
389                 printk(KERN_ERR "%s%d: adapter kernel panic.\n", dev->name, instance);
390                 goto error_iounmap;
391         }
392         /*
393          *      Check to see if the monitor panic'd while booting.
394          */
395         if (rx_readl(dev, MUnit.OMRx[0]) & MONITOR_PANIC) {
396                 printk(KERN_ERR "%s%d: adapter monitor panic.\n", dev->name, instance);
397                 goto error_iounmap;
398         }
399         start = jiffies;
400         /*
401          *      Wait for the adapter to be up and running. Wait up to 3 minutes
402          */
403         while ((!(rx_readl(dev, IndexRegs.Mailbox[7]) & KERNEL_UP_AND_RUNNING))
404                 || (!(rx_readl(dev, MUnit.OMRx[0]) & KERNEL_UP_AND_RUNNING)))
405         {
406                 if(time_after(jiffies, start+180*HZ))
407                 {
408                         status = rx_readl(dev, IndexRegs.Mailbox[7]);
409                         printk(KERN_ERR "%s%d: adapter kernel failed to start, init status = %lx.\n", 
410                                         dev->name, instance, status);
411                         goto error_iounmap;
412                 }
413                 set_current_state(TASK_UNINTERRUPTIBLE);
414                 schedule_timeout(1);
415         }
416         if (request_irq(dev->scsi_host_ptr->irq, aac_rx_intr, SA_SHIRQ|SA_INTERRUPT, "aacraid", (void *)dev)<0) 
417         {
418                 printk(KERN_ERR "%s%d: Interrupt unavailable.\n", name, instance);
419                 goto error_iounmap;
420         }
421         /*
422          *      Fill in the function dispatch table.
423          */
424         dev->a_ops.adapter_interrupt = aac_rx_interrupt_adapter;
425         dev->a_ops.adapter_disable_int = aac_rx_disable_interrupt;
426         dev->a_ops.adapter_notify = aac_rx_notify_adapter;
427         dev->a_ops.adapter_sync_cmd = rx_sync_cmd;
428         dev->a_ops.adapter_check_health = aac_rx_check_health;
429
430         /*
431          *      First clear out all interrupts.  Then enable the one's that we
432          *      can handle.
433          */
434         rx_writeb(dev, MUnit.OIMR, 0xff);
435         rx_writel(dev, MUnit.ODR, 0xffffffff);
436         rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xfb);
437
438         if (aac_init_adapter(dev) == NULL)
439                 goto error_irq;
440         /*
441          *      Start any kernel threads needed
442          */
443         dev->thread_pid = kernel_thread((int (*)(void *))aac_command_thread, dev, 0);
444         if(dev->thread_pid < 0)
445         {
446                 printk(KERN_ERR "aacraid: Unable to create rx thread.\n");
447                 goto error_kfree;
448         }
449         /*
450          *      Tell the adapter that all is configured, and it can start
451          *      accepting requests
452          */
453         aac_rx_start_adapter(dev);
454         return 0;
455
456 error_kfree:
457         kfree(dev->queues);
458
459 error_irq:
460         rx_writeb(dev, MUnit.OIMR, dev->OIMR = 0xff);
461         free_irq(dev->scsi_host_ptr->irq, (void *)dev);
462
463 error_iounmap:
464         iounmap(dev->regs.rx);
465
466         return -1;
467 }