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89bcb05d DA |
1 | /* |
2 | * Driver for HP iLO/iLO2 management processor. | |
3 | * | |
4 | * Copyright (C) 2008 Hewlett-Packard Development Company, L.P. | |
5 | * David Altobelli <david.altobelli@hp.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/pci.h> | |
9f704841 | 16 | #include <linux/interrupt.h> |
89bcb05d DA |
17 | #include <linux/ioport.h> |
18 | #include <linux/device.h> | |
19 | #include <linux/file.h> | |
20 | #include <linux/cdev.h> | |
21 | #include <linux/spinlock.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/io.h> | |
9f704841 | 25 | #include <linux/wait.h> |
89bcb05d DA |
26 | #include "hpilo.h" |
27 | ||
28 | static struct class *ilo_class; | |
29 | static unsigned int ilo_major; | |
30 | static char ilo_hwdev[MAX_ILO_DEV]; | |
31 | ||
32 | static inline int get_entry_id(int entry) | |
33 | { | |
34 | return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR; | |
35 | } | |
36 | ||
37 | static inline int get_entry_len(int entry) | |
38 | { | |
39 | return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3; | |
40 | } | |
41 | ||
42 | static inline int mk_entry(int id, int len) | |
43 | { | |
44 | int qlen = len & 7 ? (len >> 3) + 1 : len >> 3; | |
45 | return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS; | |
46 | } | |
47 | ||
48 | static inline int desc_mem_sz(int nr_entry) | |
49 | { | |
50 | return nr_entry << L2_QENTRY_SZ; | |
51 | } | |
52 | ||
53 | /* | |
54 | * FIFO queues, shared with hardware. | |
55 | * | |
56 | * If a queue has empty slots, an entry is added to the queue tail, | |
57 | * and that entry is marked as occupied. | |
58 | * Entries can be dequeued from the head of the list, when the device | |
59 | * has marked the entry as consumed. | |
60 | * | |
61 | * Returns true on successful queue/dequeue, false on failure. | |
62 | */ | |
63 | static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry) | |
64 | { | |
65 | struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); | |
9f704841 | 66 | unsigned long flags; |
89bcb05d DA |
67 | int ret = 0; |
68 | ||
9f704841 | 69 | spin_lock_irqsave(&hw->fifo_lock, flags); |
89bcb05d DA |
70 | if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask] |
71 | & ENTRY_MASK_O)) { | |
72 | fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |= | |
73 | (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge; | |
74 | fifo_q->tail += 1; | |
75 | ret = 1; | |
76 | } | |
9f704841 | 77 | spin_unlock_irqrestore(&hw->fifo_lock, flags); |
89bcb05d DA |
78 | |
79 | return ret; | |
80 | } | |
81 | ||
82 | static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry) | |
83 | { | |
84 | struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); | |
9f704841 | 85 | unsigned long flags; |
89bcb05d DA |
86 | int ret = 0; |
87 | u64 c; | |
88 | ||
9f704841 | 89 | spin_lock_irqsave(&hw->fifo_lock, flags); |
89bcb05d DA |
90 | c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; |
91 | if (c & ENTRY_MASK_C) { | |
92 | if (entry) | |
93 | *entry = c & ENTRY_MASK_NOSTATE; | |
94 | ||
95 | fifo_q->fifobar[fifo_q->head & fifo_q->imask] = | |
96 | (c | ENTRY_MASK) + 1; | |
97 | fifo_q->head += 1; | |
98 | ret = 1; | |
99 | } | |
9f704841 | 100 | spin_unlock_irqrestore(&hw->fifo_lock, flags); |
89bcb05d DA |
101 | |
102 | return ret; | |
103 | } | |
104 | ||
105 | static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb, | |
106 | int dir, int id, int len) | |
107 | { | |
108 | char *fifobar; | |
109 | int entry; | |
110 | ||
111 | if (dir == SENDQ) | |
112 | fifobar = ccb->ccb_u1.send_fifobar; | |
113 | else | |
114 | fifobar = ccb->ccb_u3.recv_fifobar; | |
115 | ||
116 | entry = mk_entry(id, len); | |
117 | return fifo_enqueue(hw, fifobar, entry); | |
118 | } | |
119 | ||
120 | static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb, | |
121 | int dir, int *id, int *len, void **pkt) | |
122 | { | |
123 | char *fifobar, *desc; | |
124 | int entry = 0, pkt_id = 0; | |
125 | int ret; | |
126 | ||
127 | if (dir == SENDQ) { | |
128 | fifobar = ccb->ccb_u1.send_fifobar; | |
129 | desc = ccb->ccb_u2.send_desc; | |
130 | } else { | |
131 | fifobar = ccb->ccb_u3.recv_fifobar; | |
132 | desc = ccb->ccb_u4.recv_desc; | |
133 | } | |
134 | ||
135 | ret = fifo_dequeue(hw, fifobar, &entry); | |
136 | if (ret) { | |
137 | pkt_id = get_entry_id(entry); | |
138 | if (id) | |
139 | *id = pkt_id; | |
140 | if (len) | |
141 | *len = get_entry_len(entry); | |
142 | if (pkt) | |
143 | *pkt = (void *)(desc + desc_mem_sz(pkt_id)); | |
144 | } | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static inline void doorbell_set(struct ccb *ccb) | |
150 | { | |
151 | iowrite8(1, ccb->ccb_u5.db_base); | |
152 | } | |
153 | ||
154 | static inline void doorbell_clr(struct ccb *ccb) | |
155 | { | |
156 | iowrite8(2, ccb->ccb_u5.db_base); | |
157 | } | |
66d5e516 | 158 | |
89bcb05d DA |
159 | static inline int ctrl_set(int l2sz, int idxmask, int desclim) |
160 | { | |
161 | int active = 0, go = 1; | |
162 | return l2sz << CTRL_BITPOS_L2SZ | | |
163 | idxmask << CTRL_BITPOS_FIFOINDEXMASK | | |
164 | desclim << CTRL_BITPOS_DESCLIMIT | | |
165 | active << CTRL_BITPOS_A | | |
166 | go << CTRL_BITPOS_G; | |
167 | } | |
66d5e516 | 168 | |
89bcb05d DA |
169 | static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz) |
170 | { | |
171 | /* for simplicity, use the same parameters for send and recv ctrls */ | |
172 | ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); | |
173 | ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); | |
174 | } | |
175 | ||
176 | static inline int fifo_sz(int nr_entry) | |
177 | { | |
178 | /* size of a fifo is determined by the number of entries it contains */ | |
179 | return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE; | |
180 | } | |
181 | ||
182 | static void fifo_setup(void *base_addr, int nr_entry) | |
183 | { | |
184 | struct fifo *fifo_q = base_addr; | |
185 | int i; | |
186 | ||
187 | /* set up an empty fifo */ | |
188 | fifo_q->head = 0; | |
189 | fifo_q->tail = 0; | |
190 | fifo_q->reset = 0; | |
191 | fifo_q->nrents = nr_entry; | |
192 | fifo_q->imask = nr_entry - 1; | |
193 | fifo_q->merge = ENTRY_MASK_O; | |
194 | ||
195 | for (i = 0; i < nr_entry; i++) | |
196 | fifo_q->fifobar[i] = 0; | |
197 | } | |
198 | ||
199 | static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data) | |
200 | { | |
66d5e516 DA |
201 | struct ccb *driver_ccb = &data->driver_ccb; |
202 | struct ccb __iomem *device_ccb = data->mapped_ccb; | |
89bcb05d DA |
203 | int retries; |
204 | ||
89bcb05d DA |
205 | /* complicated dance to tell the hw we are stopping */ |
206 | doorbell_clr(driver_ccb); | |
207 | iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G), | |
208 | &device_ccb->send_ctrl); | |
209 | iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G), | |
210 | &device_ccb->recv_ctrl); | |
211 | ||
212 | /* give iLO some time to process stop request */ | |
c073b2db | 213 | for (retries = MAX_WAIT; retries > 0; retries--) { |
89bcb05d | 214 | doorbell_set(driver_ccb); |
891f7d73 | 215 | udelay(WAIT_TIME); |
89bcb05d DA |
216 | if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A)) |
217 | && | |
218 | !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A))) | |
219 | break; | |
220 | } | |
221 | if (retries == 0) | |
222 | dev_err(&pdev->dev, "Closing, but controller still active\n"); | |
223 | ||
224 | /* clear the hw ccb */ | |
225 | memset_io(device_ccb, 0, sizeof(struct ccb)); | |
226 | ||
227 | /* free resources used to back send/recv queues */ | |
228 | pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa); | |
229 | } | |
230 | ||
66d5e516 | 231 | static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) |
89bcb05d DA |
232 | { |
233 | char *dma_va, *dma_pa; | |
89bcb05d | 234 | struct ccb *driver_ccb, *ilo_ccb; |
89bcb05d DA |
235 | |
236 | driver_ccb = &data->driver_ccb; | |
237 | ilo_ccb = &data->ilo_ccb; | |
89bcb05d DA |
238 | |
239 | data->dma_size = 2 * fifo_sz(NR_QENTRY) + | |
240 | 2 * desc_mem_sz(NR_QENTRY) + | |
241 | ILO_START_ALIGN + ILO_CACHE_SZ; | |
242 | ||
66d5e516 | 243 | data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size, |
89bcb05d DA |
244 | &data->dma_pa); |
245 | if (!data->dma_va) | |
66d5e516 | 246 | return -ENOMEM; |
89bcb05d DA |
247 | |
248 | dma_va = (char *)data->dma_va; | |
249 | dma_pa = (char *)data->dma_pa; | |
250 | ||
251 | memset(dma_va, 0, data->dma_size); | |
252 | ||
253 | dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN); | |
254 | dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_START_ALIGN); | |
255 | ||
256 | /* | |
257 | * Create two ccb's, one with virt addrs, one with phys addrs. | |
258 | * Copy the phys addr ccb to device shared mem. | |
259 | */ | |
260 | ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ); | |
261 | ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ); | |
262 | ||
263 | fifo_setup(dma_va, NR_QENTRY); | |
264 | driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE; | |
265 | ilo_ccb->ccb_u1.send_fifobar = dma_pa + FIFOHANDLESIZE; | |
266 | dma_va += fifo_sz(NR_QENTRY); | |
267 | dma_pa += fifo_sz(NR_QENTRY); | |
268 | ||
269 | dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ); | |
270 | dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_CACHE_SZ); | |
271 | ||
272 | fifo_setup(dma_va, NR_QENTRY); | |
273 | driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE; | |
274 | ilo_ccb->ccb_u3.recv_fifobar = dma_pa + FIFOHANDLESIZE; | |
275 | dma_va += fifo_sz(NR_QENTRY); | |
276 | dma_pa += fifo_sz(NR_QENTRY); | |
277 | ||
278 | driver_ccb->ccb_u2.send_desc = dma_va; | |
279 | ilo_ccb->ccb_u2.send_desc = dma_pa; | |
280 | dma_pa += desc_mem_sz(NR_QENTRY); | |
281 | dma_va += desc_mem_sz(NR_QENTRY); | |
282 | ||
283 | driver_ccb->ccb_u4.recv_desc = dma_va; | |
284 | ilo_ccb->ccb_u4.recv_desc = dma_pa; | |
285 | ||
286 | driver_ccb->channel = slot; | |
287 | ilo_ccb->channel = slot; | |
288 | ||
289 | driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE); | |
290 | ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */ | |
291 | ||
66d5e516 DA |
292 | return 0; |
293 | } | |
294 | ||
295 | static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) | |
296 | { | |
297 | int pkt_id, pkt_sz; | |
298 | struct ccb *driver_ccb = &data->driver_ccb; | |
299 | ||
89bcb05d DA |
300 | /* copy the ccb with physical addrs to device memory */ |
301 | data->mapped_ccb = (struct ccb __iomem *) | |
302 | (hw->ram_vaddr + (slot * ILOHW_CCB_SZ)); | |
66d5e516 | 303 | memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb)); |
89bcb05d DA |
304 | |
305 | /* put packets on the send and receive queues */ | |
306 | pkt_sz = 0; | |
307 | for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) { | |
308 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz); | |
309 | doorbell_set(driver_ccb); | |
310 | } | |
311 | ||
312 | pkt_sz = desc_mem_sz(1); | |
313 | for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) | |
314 | ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz); | |
315 | ||
66d5e516 | 316 | /* the ccb is ready to use */ |
89bcb05d | 317 | doorbell_clr(driver_ccb); |
66d5e516 DA |
318 | } |
319 | ||
320 | static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data) | |
321 | { | |
322 | int pkt_id, i; | |
323 | struct ccb *driver_ccb = &data->driver_ccb; | |
89bcb05d DA |
324 | |
325 | /* make sure iLO is really handling requests */ | |
c073b2db | 326 | for (i = MAX_WAIT; i > 0; i--) { |
89bcb05d DA |
327 | if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL)) |
328 | break; | |
891f7d73 | 329 | udelay(WAIT_TIME); |
89bcb05d DA |
330 | } |
331 | ||
66d5e516 DA |
332 | if (i == 0) { |
333 | dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n"); | |
334 | return -EBUSY; | |
89bcb05d DA |
335 | } |
336 | ||
66d5e516 DA |
337 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); |
338 | doorbell_set(driver_ccb); | |
89bcb05d | 339 | return 0; |
89bcb05d DA |
340 | } |
341 | ||
342 | static inline int is_channel_reset(struct ccb *ccb) | |
343 | { | |
344 | /* check for this particular channel needing a reset */ | |
345 | return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset; | |
346 | } | |
347 | ||
348 | static inline void set_channel_reset(struct ccb *ccb) | |
349 | { | |
350 | /* set a flag indicating this channel needs a reset */ | |
351 | FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1; | |
352 | } | |
353 | ||
66d5e516 DA |
354 | static inline int get_device_outbound(struct ilo_hwinfo *hw) |
355 | { | |
356 | return ioread32(&hw->mmio_vaddr[DB_OUT]); | |
357 | } | |
358 | ||
359 | static inline int is_db_reset(int db_out) | |
360 | { | |
361 | return db_out & (1 << DB_RESET); | |
362 | } | |
363 | ||
89bcb05d DA |
364 | static inline int is_device_reset(struct ilo_hwinfo *hw) |
365 | { | |
366 | /* check for global reset condition */ | |
66d5e516 DA |
367 | return is_db_reset(get_device_outbound(hw)); |
368 | } | |
369 | ||
370 | static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr) | |
371 | { | |
372 | iowrite32(clr, &hw->mmio_vaddr[DB_OUT]); | |
89bcb05d DA |
373 | } |
374 | ||
375 | static inline void clear_device(struct ilo_hwinfo *hw) | |
376 | { | |
377 | /* clear the device (reset bits, pending channel entries) */ | |
66d5e516 | 378 | clear_pending_db(hw, -1); |
89bcb05d DA |
379 | } |
380 | ||
9f704841 DA |
381 | static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw) |
382 | { | |
383 | iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]); | |
384 | } | |
385 | ||
386 | static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw) | |
387 | { | |
388 | iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1, | |
389 | &hw->mmio_vaddr[DB_IRQ]); | |
390 | } | |
391 | ||
392 | static void ilo_set_reset(struct ilo_hwinfo *hw) | |
89bcb05d DA |
393 | { |
394 | int slot; | |
395 | ||
396 | /* | |
397 | * Mapped memory is zeroed on ilo reset, so set a per ccb flag | |
398 | * to indicate that this ccb needs to be closed and reopened. | |
399 | */ | |
400 | for (slot = 0; slot < MAX_CCB; slot++) { | |
401 | if (!hw->ccb_alloc[slot]) | |
402 | continue; | |
403 | set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb); | |
404 | } | |
89bcb05d DA |
405 | } |
406 | ||
407 | static ssize_t ilo_read(struct file *fp, char __user *buf, | |
408 | size_t len, loff_t *off) | |
409 | { | |
410 | int err, found, cnt, pkt_id, pkt_len; | |
66d5e516 DA |
411 | struct ccb_data *data = fp->private_data; |
412 | struct ccb *driver_ccb = &data->driver_ccb; | |
413 | struct ilo_hwinfo *hw = data->ilo_hw; | |
89bcb05d DA |
414 | void *pkt; |
415 | ||
9f704841 | 416 | if (is_channel_reset(driver_ccb)) { |
89bcb05d DA |
417 | /* |
418 | * If the device has been reset, applications | |
419 | * need to close and reopen all ccbs. | |
420 | */ | |
89bcb05d DA |
421 | return -ENODEV; |
422 | } | |
423 | ||
424 | /* | |
425 | * This function is to be called when data is expected | |
426 | * in the channel, and will return an error if no packet is found | |
427 | * during the loop below. The sleep/retry logic is to allow | |
428 | * applications to call read() immediately post write(), | |
429 | * and give iLO some time to process the sent packet. | |
430 | */ | |
431 | cnt = 20; | |
432 | do { | |
433 | /* look for a received packet */ | |
434 | found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id, | |
435 | &pkt_len, &pkt); | |
436 | if (found) | |
437 | break; | |
438 | cnt--; | |
439 | msleep(100); | |
440 | } while (!found && cnt); | |
441 | ||
442 | if (!found) | |
443 | return -EAGAIN; | |
444 | ||
445 | /* only copy the length of the received packet */ | |
446 | if (pkt_len < len) | |
447 | len = pkt_len; | |
448 | ||
449 | err = copy_to_user(buf, pkt, len); | |
450 | ||
451 | /* return the received packet to the queue */ | |
452 | ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1)); | |
453 | ||
454 | return err ? -EFAULT : len; | |
455 | } | |
456 | ||
457 | static ssize_t ilo_write(struct file *fp, const char __user *buf, | |
458 | size_t len, loff_t *off) | |
459 | { | |
460 | int err, pkt_id, pkt_len; | |
66d5e516 DA |
461 | struct ccb_data *data = fp->private_data; |
462 | struct ccb *driver_ccb = &data->driver_ccb; | |
463 | struct ilo_hwinfo *hw = data->ilo_hw; | |
89bcb05d DA |
464 | void *pkt; |
465 | ||
9f704841 | 466 | if (is_channel_reset(driver_ccb)) |
89bcb05d | 467 | return -ENODEV; |
89bcb05d DA |
468 | |
469 | /* get a packet to send the user command */ | |
470 | if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt)) | |
471 | return -EBUSY; | |
472 | ||
473 | /* limit the length to the length of the packet */ | |
474 | if (pkt_len < len) | |
475 | len = pkt_len; | |
476 | ||
477 | /* on failure, set the len to 0 to return empty packet to the device */ | |
478 | err = copy_from_user(pkt, buf, len); | |
479 | if (err) | |
480 | len = 0; | |
481 | ||
482 | /* send the packet */ | |
483 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len); | |
484 | doorbell_set(driver_ccb); | |
485 | ||
486 | return err ? -EFAULT : len; | |
487 | } | |
488 | ||
489 | static int ilo_close(struct inode *ip, struct file *fp) | |
490 | { | |
491 | int slot; | |
492 | struct ccb_data *data; | |
493 | struct ilo_hwinfo *hw; | |
9f704841 | 494 | unsigned long flags; |
89bcb05d DA |
495 | |
496 | slot = iminor(ip) % MAX_CCB; | |
497 | hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); | |
498 | ||
9f704841 | 499 | spin_lock(&hw->open_lock); |
89bcb05d DA |
500 | |
501 | if (hw->ccb_alloc[slot]->ccb_cnt == 1) { | |
502 | ||
503 | data = fp->private_data; | |
504 | ||
9f704841 DA |
505 | spin_lock_irqsave(&hw->alloc_lock, flags); |
506 | hw->ccb_alloc[slot] = NULL; | |
507 | spin_unlock_irqrestore(&hw->alloc_lock, flags); | |
508 | ||
89bcb05d DA |
509 | ilo_ccb_close(hw->ilo_dev, data); |
510 | ||
511 | kfree(data); | |
89bcb05d DA |
512 | } else |
513 | hw->ccb_alloc[slot]->ccb_cnt--; | |
514 | ||
9f704841 | 515 | spin_unlock(&hw->open_lock); |
89bcb05d DA |
516 | |
517 | return 0; | |
518 | } | |
519 | ||
520 | static int ilo_open(struct inode *ip, struct file *fp) | |
521 | { | |
522 | int slot, error; | |
523 | struct ccb_data *data; | |
524 | struct ilo_hwinfo *hw; | |
9f704841 | 525 | unsigned long flags; |
89bcb05d DA |
526 | |
527 | slot = iminor(ip) % MAX_CCB; | |
528 | hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); | |
529 | ||
530 | /* new ccb allocation */ | |
531 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
532 | if (!data) | |
533 | return -ENOMEM; | |
534 | ||
9f704841 | 535 | spin_lock(&hw->open_lock); |
89bcb05d DA |
536 | |
537 | /* each fd private_data holds sw/hw view of ccb */ | |
538 | if (hw->ccb_alloc[slot] == NULL) { | |
539 | /* create a channel control block for this minor */ | |
66d5e516 DA |
540 | error = ilo_ccb_setup(hw, data, slot); |
541 | if (error) { | |
89bcb05d | 542 | kfree(data); |
66d5e516 DA |
543 | goto out; |
544 | } | |
545 | ||
9f704841 DA |
546 | data->ccb_cnt = 1; |
547 | data->ccb_excl = fp->f_flags & O_EXCL; | |
548 | data->ilo_hw = hw; | |
549 | init_waitqueue_head(&data->ccb_waitq); | |
550 | ||
66d5e516 | 551 | /* write the ccb to hw */ |
9f704841 | 552 | spin_lock_irqsave(&hw->alloc_lock, flags); |
66d5e516 | 553 | ilo_ccb_open(hw, data, slot); |
9f704841 DA |
554 | hw->ccb_alloc[slot] = data; |
555 | spin_unlock_irqrestore(&hw->alloc_lock, flags); | |
66d5e516 DA |
556 | |
557 | /* make sure the channel is functional */ | |
558 | error = ilo_ccb_verify(hw, data); | |
559 | if (error) { | |
9f704841 DA |
560 | |
561 | spin_lock_irqsave(&hw->alloc_lock, flags); | |
562 | hw->ccb_alloc[slot] = NULL; | |
563 | spin_unlock_irqrestore(&hw->alloc_lock, flags); | |
564 | ||
66d5e516 | 565 | ilo_ccb_close(hw->ilo_dev, data); |
9f704841 | 566 | |
66d5e516 DA |
567 | kfree(data); |
568 | goto out; | |
569 | } | |
570 | ||
89bcb05d DA |
571 | } else { |
572 | kfree(data); | |
573 | if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) { | |
574 | /* | |
575 | * The channel exists, and either this open | |
576 | * or a previous open of this channel wants | |
577 | * exclusive access. | |
578 | */ | |
579 | error = -EBUSY; | |
580 | } else { | |
581 | hw->ccb_alloc[slot]->ccb_cnt++; | |
582 | error = 0; | |
583 | } | |
584 | } | |
66d5e516 | 585 | out: |
9f704841 | 586 | spin_unlock(&hw->open_lock); |
89bcb05d DA |
587 | |
588 | if (!error) | |
589 | fp->private_data = hw->ccb_alloc[slot]; | |
590 | ||
591 | return error; | |
592 | } | |
593 | ||
594 | static const struct file_operations ilo_fops = { | |
595 | .owner = THIS_MODULE, | |
596 | .read = ilo_read, | |
597 | .write = ilo_write, | |
598 | .open = ilo_open, | |
599 | .release = ilo_close, | |
600 | }; | |
601 | ||
9f704841 DA |
602 | static irqreturn_t ilo_isr(int irq, void *data) |
603 | { | |
604 | struct ilo_hwinfo *hw = data; | |
605 | int pending, i; | |
606 | ||
607 | spin_lock(&hw->alloc_lock); | |
608 | ||
609 | /* check for ccbs which have data */ | |
610 | pending = get_device_outbound(hw); | |
611 | if (!pending) { | |
612 | spin_unlock(&hw->alloc_lock); | |
613 | return IRQ_NONE; | |
614 | } | |
615 | ||
616 | if (is_db_reset(pending)) { | |
617 | /* wake up all ccbs if the device was reset */ | |
618 | pending = -1; | |
619 | ilo_set_reset(hw); | |
620 | } | |
621 | ||
622 | for (i = 0; i < MAX_CCB; i++) { | |
623 | if (!hw->ccb_alloc[i]) | |
624 | continue; | |
625 | if (pending & (1 << i)) | |
626 | wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq); | |
627 | } | |
628 | ||
629 | /* clear the device of the channels that have been handled */ | |
630 | clear_pending_db(hw, pending); | |
631 | ||
632 | spin_unlock(&hw->alloc_lock); | |
633 | ||
634 | return IRQ_HANDLED; | |
635 | } | |
636 | ||
89bcb05d DA |
637 | static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) |
638 | { | |
639 | pci_iounmap(pdev, hw->db_vaddr); | |
640 | pci_iounmap(pdev, hw->ram_vaddr); | |
641 | pci_iounmap(pdev, hw->mmio_vaddr); | |
642 | } | |
643 | ||
644 | static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) | |
645 | { | |
646 | int error = -ENOMEM; | |
647 | ||
648 | /* map the memory mapped i/o registers */ | |
649 | hw->mmio_vaddr = pci_iomap(pdev, 1, 0); | |
650 | if (hw->mmio_vaddr == NULL) { | |
651 | dev_err(&pdev->dev, "Error mapping mmio\n"); | |
652 | goto out; | |
653 | } | |
654 | ||
655 | /* map the adapter shared memory region */ | |
656 | hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ); | |
657 | if (hw->ram_vaddr == NULL) { | |
658 | dev_err(&pdev->dev, "Error mapping shared mem\n"); | |
659 | goto mmio_free; | |
660 | } | |
661 | ||
662 | /* map the doorbell aperture */ | |
663 | hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE); | |
664 | if (hw->db_vaddr == NULL) { | |
665 | dev_err(&pdev->dev, "Error mapping doorbell\n"); | |
666 | goto ram_free; | |
667 | } | |
668 | ||
669 | return 0; | |
670 | ram_free: | |
671 | pci_iounmap(pdev, hw->ram_vaddr); | |
672 | mmio_free: | |
673 | pci_iounmap(pdev, hw->mmio_vaddr); | |
674 | out: | |
675 | return error; | |
676 | } | |
677 | ||
678 | static void ilo_remove(struct pci_dev *pdev) | |
679 | { | |
680 | int i, minor; | |
681 | struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev); | |
682 | ||
683 | clear_device(ilo_hw); | |
684 | ||
685 | minor = MINOR(ilo_hw->cdev.dev); | |
686 | for (i = minor; i < minor + MAX_CCB; i++) | |
687 | device_destroy(ilo_class, MKDEV(ilo_major, i)); | |
688 | ||
689 | cdev_del(&ilo_hw->cdev); | |
9f704841 DA |
690 | ilo_disable_interrupts(ilo_hw); |
691 | free_irq(pdev->irq, ilo_hw); | |
89bcb05d DA |
692 | ilo_unmap_device(pdev, ilo_hw); |
693 | pci_release_regions(pdev); | |
694 | pci_disable_device(pdev); | |
695 | kfree(ilo_hw); | |
696 | ilo_hwdev[(minor / MAX_CCB)] = 0; | |
697 | } | |
698 | ||
699 | static int __devinit ilo_probe(struct pci_dev *pdev, | |
700 | const struct pci_device_id *ent) | |
701 | { | |
702 | int devnum, minor, start, error; | |
703 | struct ilo_hwinfo *ilo_hw; | |
704 | ||
705 | /* find a free range for device files */ | |
706 | for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) { | |
707 | if (ilo_hwdev[devnum] == 0) { | |
708 | ilo_hwdev[devnum] = 1; | |
709 | break; | |
710 | } | |
711 | } | |
712 | ||
713 | if (devnum == MAX_ILO_DEV) { | |
714 | dev_err(&pdev->dev, "Error finding free device\n"); | |
715 | return -ENODEV; | |
716 | } | |
717 | ||
718 | /* track global allocations for this device */ | |
719 | error = -ENOMEM; | |
720 | ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL); | |
721 | if (!ilo_hw) | |
722 | goto out; | |
723 | ||
724 | ilo_hw->ilo_dev = pdev; | |
725 | spin_lock_init(&ilo_hw->alloc_lock); | |
726 | spin_lock_init(&ilo_hw->fifo_lock); | |
9f704841 | 727 | spin_lock_init(&ilo_hw->open_lock); |
89bcb05d DA |
728 | |
729 | error = pci_enable_device(pdev); | |
730 | if (error) | |
731 | goto free; | |
732 | ||
733 | pci_set_master(pdev); | |
734 | ||
735 | error = pci_request_regions(pdev, ILO_NAME); | |
736 | if (error) | |
737 | goto disable; | |
738 | ||
739 | error = ilo_map_device(pdev, ilo_hw); | |
740 | if (error) | |
741 | goto free_regions; | |
742 | ||
743 | pci_set_drvdata(pdev, ilo_hw); | |
744 | clear_device(ilo_hw); | |
745 | ||
9f704841 DA |
746 | error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw); |
747 | if (error) | |
748 | goto unmap; | |
749 | ||
750 | ilo_enable_interrupts(ilo_hw); | |
751 | ||
89bcb05d DA |
752 | cdev_init(&ilo_hw->cdev, &ilo_fops); |
753 | ilo_hw->cdev.owner = THIS_MODULE; | |
754 | start = devnum * MAX_CCB; | |
755 | error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB); | |
756 | if (error) { | |
757 | dev_err(&pdev->dev, "Could not add cdev\n"); | |
9f704841 | 758 | goto remove_isr; |
89bcb05d DA |
759 | } |
760 | ||
761 | for (minor = 0 ; minor < MAX_CCB; minor++) { | |
762 | struct device *dev; | |
763 | dev = device_create(ilo_class, &pdev->dev, | |
764 | MKDEV(ilo_major, minor), NULL, | |
765 | "hpilo!d%dccb%d", devnum, minor); | |
766 | if (IS_ERR(dev)) | |
767 | dev_err(&pdev->dev, "Could not create files\n"); | |
768 | } | |
769 | ||
770 | return 0; | |
9f704841 DA |
771 | remove_isr: |
772 | ilo_disable_interrupts(ilo_hw); | |
773 | free_irq(pdev->irq, ilo_hw); | |
89bcb05d DA |
774 | unmap: |
775 | ilo_unmap_device(pdev, ilo_hw); | |
776 | free_regions: | |
777 | pci_release_regions(pdev); | |
778 | disable: | |
779 | pci_disable_device(pdev); | |
780 | free: | |
781 | kfree(ilo_hw); | |
782 | out: | |
783 | ilo_hwdev[devnum] = 0; | |
784 | return error; | |
785 | } | |
786 | ||
787 | static struct pci_device_id ilo_devices[] = { | |
788 | { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) }, | |
31d8b563 | 789 | { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) }, |
89bcb05d DA |
790 | { } |
791 | }; | |
792 | MODULE_DEVICE_TABLE(pci, ilo_devices); | |
793 | ||
794 | static struct pci_driver ilo_driver = { | |
795 | .name = ILO_NAME, | |
796 | .id_table = ilo_devices, | |
797 | .probe = ilo_probe, | |
798 | .remove = __devexit_p(ilo_remove), | |
799 | }; | |
800 | ||
801 | static int __init ilo_init(void) | |
802 | { | |
803 | int error; | |
804 | dev_t dev; | |
805 | ||
806 | ilo_class = class_create(THIS_MODULE, "iLO"); | |
807 | if (IS_ERR(ilo_class)) { | |
808 | error = PTR_ERR(ilo_class); | |
809 | goto out; | |
810 | } | |
811 | ||
812 | error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME); | |
813 | if (error) | |
814 | goto class_destroy; | |
815 | ||
816 | ilo_major = MAJOR(dev); | |
817 | ||
818 | error = pci_register_driver(&ilo_driver); | |
819 | if (error) | |
820 | goto chr_remove; | |
821 | ||
822 | return 0; | |
823 | chr_remove: | |
824 | unregister_chrdev_region(dev, MAX_OPEN); | |
825 | class_destroy: | |
826 | class_destroy(ilo_class); | |
827 | out: | |
828 | return error; | |
829 | } | |
830 | ||
831 | static void __exit ilo_exit(void) | |
832 | { | |
833 | pci_unregister_driver(&ilo_driver); | |
834 | unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN); | |
835 | class_destroy(ilo_class); | |
836 | } | |
837 | ||
891f7d73 | 838 | MODULE_VERSION("1.1"); |
89bcb05d DA |
839 | MODULE_ALIAS(ILO_NAME); |
840 | MODULE_DESCRIPTION(ILO_NAME); | |
841 | MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>"); | |
842 | MODULE_LICENSE("GPL v2"); | |
843 | ||
844 | module_init(ilo_init); | |
845 | module_exit(ilo_exit); |