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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> | |
d43c36dc | 21 | #include <linux/sched.h> |
89bcb05d DA |
22 | #include <linux/spinlock.h> |
23 | #include <linux/delay.h> | |
24 | #include <linux/uaccess.h> | |
25 | #include <linux/io.h> | |
9f704841 | 26 | #include <linux/wait.h> |
4a351471 | 27 | #include <linux/poll.h> |
89bcb05d DA |
28 | #include "hpilo.h" |
29 | ||
30 | static struct class *ilo_class; | |
31 | static unsigned int ilo_major; | |
32 | static char ilo_hwdev[MAX_ILO_DEV]; | |
33 | ||
34 | static inline int get_entry_id(int entry) | |
35 | { | |
36 | return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR; | |
37 | } | |
38 | ||
39 | static inline int get_entry_len(int entry) | |
40 | { | |
41 | return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3; | |
42 | } | |
43 | ||
44 | static inline int mk_entry(int id, int len) | |
45 | { | |
46 | int qlen = len & 7 ? (len >> 3) + 1 : len >> 3; | |
47 | return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS; | |
48 | } | |
49 | ||
50 | static inline int desc_mem_sz(int nr_entry) | |
51 | { | |
52 | return nr_entry << L2_QENTRY_SZ; | |
53 | } | |
54 | ||
55 | /* | |
56 | * FIFO queues, shared with hardware. | |
57 | * | |
58 | * If a queue has empty slots, an entry is added to the queue tail, | |
59 | * and that entry is marked as occupied. | |
60 | * Entries can be dequeued from the head of the list, when the device | |
61 | * has marked the entry as consumed. | |
62 | * | |
63 | * Returns true on successful queue/dequeue, false on failure. | |
64 | */ | |
65 | static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry) | |
66 | { | |
67 | struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); | |
9f704841 | 68 | unsigned long flags; |
89bcb05d DA |
69 | int ret = 0; |
70 | ||
9f704841 | 71 | spin_lock_irqsave(&hw->fifo_lock, flags); |
89bcb05d DA |
72 | if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask] |
73 | & ENTRY_MASK_O)) { | |
74 | fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |= | |
75 | (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge; | |
76 | fifo_q->tail += 1; | |
77 | ret = 1; | |
78 | } | |
9f704841 | 79 | spin_unlock_irqrestore(&hw->fifo_lock, flags); |
89bcb05d DA |
80 | |
81 | return ret; | |
82 | } | |
83 | ||
84 | static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry) | |
85 | { | |
86 | struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); | |
9f704841 | 87 | unsigned long flags; |
89bcb05d DA |
88 | int ret = 0; |
89 | u64 c; | |
90 | ||
9f704841 | 91 | spin_lock_irqsave(&hw->fifo_lock, flags); |
89bcb05d DA |
92 | c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; |
93 | if (c & ENTRY_MASK_C) { | |
94 | if (entry) | |
95 | *entry = c & ENTRY_MASK_NOSTATE; | |
96 | ||
97 | fifo_q->fifobar[fifo_q->head & fifo_q->imask] = | |
98 | (c | ENTRY_MASK) + 1; | |
99 | fifo_q->head += 1; | |
100 | ret = 1; | |
101 | } | |
9f704841 | 102 | spin_unlock_irqrestore(&hw->fifo_lock, flags); |
89bcb05d DA |
103 | |
104 | return ret; | |
105 | } | |
106 | ||
4a351471 DA |
107 | static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar) |
108 | { | |
109 | struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); | |
110 | unsigned long flags; | |
111 | int ret = 0; | |
112 | u64 c; | |
113 | ||
114 | spin_lock_irqsave(&hw->fifo_lock, flags); | |
115 | c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; | |
116 | if (c & ENTRY_MASK_C) | |
117 | ret = 1; | |
118 | spin_unlock_irqrestore(&hw->fifo_lock, flags); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
89bcb05d DA |
123 | static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb, |
124 | int dir, int id, int len) | |
125 | { | |
126 | char *fifobar; | |
127 | int entry; | |
128 | ||
129 | if (dir == SENDQ) | |
130 | fifobar = ccb->ccb_u1.send_fifobar; | |
131 | else | |
132 | fifobar = ccb->ccb_u3.recv_fifobar; | |
133 | ||
134 | entry = mk_entry(id, len); | |
135 | return fifo_enqueue(hw, fifobar, entry); | |
136 | } | |
137 | ||
138 | static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb, | |
139 | int dir, int *id, int *len, void **pkt) | |
140 | { | |
141 | char *fifobar, *desc; | |
142 | int entry = 0, pkt_id = 0; | |
143 | int ret; | |
144 | ||
145 | if (dir == SENDQ) { | |
146 | fifobar = ccb->ccb_u1.send_fifobar; | |
147 | desc = ccb->ccb_u2.send_desc; | |
148 | } else { | |
149 | fifobar = ccb->ccb_u3.recv_fifobar; | |
150 | desc = ccb->ccb_u4.recv_desc; | |
151 | } | |
152 | ||
153 | ret = fifo_dequeue(hw, fifobar, &entry); | |
154 | if (ret) { | |
155 | pkt_id = get_entry_id(entry); | |
156 | if (id) | |
157 | *id = pkt_id; | |
158 | if (len) | |
159 | *len = get_entry_len(entry); | |
160 | if (pkt) | |
161 | *pkt = (void *)(desc + desc_mem_sz(pkt_id)); | |
162 | } | |
163 | ||
164 | return ret; | |
165 | } | |
166 | ||
4a351471 DA |
167 | static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb) |
168 | { | |
169 | char *fifobar = ccb->ccb_u3.recv_fifobar; | |
170 | ||
171 | return fifo_check_recv(hw, fifobar); | |
172 | } | |
173 | ||
89bcb05d DA |
174 | static inline void doorbell_set(struct ccb *ccb) |
175 | { | |
176 | iowrite8(1, ccb->ccb_u5.db_base); | |
177 | } | |
178 | ||
179 | static inline void doorbell_clr(struct ccb *ccb) | |
180 | { | |
181 | iowrite8(2, ccb->ccb_u5.db_base); | |
182 | } | |
66d5e516 | 183 | |
89bcb05d DA |
184 | static inline int ctrl_set(int l2sz, int idxmask, int desclim) |
185 | { | |
186 | int active = 0, go = 1; | |
187 | return l2sz << CTRL_BITPOS_L2SZ | | |
188 | idxmask << CTRL_BITPOS_FIFOINDEXMASK | | |
189 | desclim << CTRL_BITPOS_DESCLIMIT | | |
190 | active << CTRL_BITPOS_A | | |
191 | go << CTRL_BITPOS_G; | |
192 | } | |
66d5e516 | 193 | |
89bcb05d DA |
194 | static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz) |
195 | { | |
196 | /* for simplicity, use the same parameters for send and recv ctrls */ | |
197 | ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); | |
198 | ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); | |
199 | } | |
200 | ||
201 | static inline int fifo_sz(int nr_entry) | |
202 | { | |
203 | /* size of a fifo is determined by the number of entries it contains */ | |
204 | return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE; | |
205 | } | |
206 | ||
207 | static void fifo_setup(void *base_addr, int nr_entry) | |
208 | { | |
209 | struct fifo *fifo_q = base_addr; | |
210 | int i; | |
211 | ||
212 | /* set up an empty fifo */ | |
213 | fifo_q->head = 0; | |
214 | fifo_q->tail = 0; | |
215 | fifo_q->reset = 0; | |
216 | fifo_q->nrents = nr_entry; | |
217 | fifo_q->imask = nr_entry - 1; | |
218 | fifo_q->merge = ENTRY_MASK_O; | |
219 | ||
220 | for (i = 0; i < nr_entry; i++) | |
221 | fifo_q->fifobar[i] = 0; | |
222 | } | |
223 | ||
224 | static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data) | |
225 | { | |
66d5e516 DA |
226 | struct ccb *driver_ccb = &data->driver_ccb; |
227 | struct ccb __iomem *device_ccb = data->mapped_ccb; | |
89bcb05d DA |
228 | int retries; |
229 | ||
89bcb05d DA |
230 | /* complicated dance to tell the hw we are stopping */ |
231 | doorbell_clr(driver_ccb); | |
232 | iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G), | |
233 | &device_ccb->send_ctrl); | |
234 | iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G), | |
235 | &device_ccb->recv_ctrl); | |
236 | ||
237 | /* give iLO some time to process stop request */ | |
c073b2db | 238 | for (retries = MAX_WAIT; retries > 0; retries--) { |
89bcb05d | 239 | doorbell_set(driver_ccb); |
891f7d73 | 240 | udelay(WAIT_TIME); |
89bcb05d DA |
241 | if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A)) |
242 | && | |
243 | !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A))) | |
244 | break; | |
245 | } | |
246 | if (retries == 0) | |
247 | dev_err(&pdev->dev, "Closing, but controller still active\n"); | |
248 | ||
249 | /* clear the hw ccb */ | |
250 | memset_io(device_ccb, 0, sizeof(struct ccb)); | |
251 | ||
252 | /* free resources used to back send/recv queues */ | |
253 | pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa); | |
254 | } | |
255 | ||
66d5e516 | 256 | static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) |
89bcb05d DA |
257 | { |
258 | char *dma_va, *dma_pa; | |
89bcb05d | 259 | struct ccb *driver_ccb, *ilo_ccb; |
89bcb05d DA |
260 | |
261 | driver_ccb = &data->driver_ccb; | |
262 | ilo_ccb = &data->ilo_ccb; | |
89bcb05d DA |
263 | |
264 | data->dma_size = 2 * fifo_sz(NR_QENTRY) + | |
265 | 2 * desc_mem_sz(NR_QENTRY) + | |
266 | ILO_START_ALIGN + ILO_CACHE_SZ; | |
267 | ||
66d5e516 | 268 | data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size, |
89bcb05d DA |
269 | &data->dma_pa); |
270 | if (!data->dma_va) | |
66d5e516 | 271 | return -ENOMEM; |
89bcb05d DA |
272 | |
273 | dma_va = (char *)data->dma_va; | |
274 | dma_pa = (char *)data->dma_pa; | |
275 | ||
276 | memset(dma_va, 0, data->dma_size); | |
277 | ||
278 | dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN); | |
279 | dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_START_ALIGN); | |
280 | ||
281 | /* | |
282 | * Create two ccb's, one with virt addrs, one with phys addrs. | |
283 | * Copy the phys addr ccb to device shared mem. | |
284 | */ | |
285 | ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ); | |
286 | ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ); | |
287 | ||
288 | fifo_setup(dma_va, NR_QENTRY); | |
289 | driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE; | |
290 | ilo_ccb->ccb_u1.send_fifobar = dma_pa + FIFOHANDLESIZE; | |
291 | dma_va += fifo_sz(NR_QENTRY); | |
292 | dma_pa += fifo_sz(NR_QENTRY); | |
293 | ||
294 | dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ); | |
295 | dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_CACHE_SZ); | |
296 | ||
297 | fifo_setup(dma_va, NR_QENTRY); | |
298 | driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE; | |
299 | ilo_ccb->ccb_u3.recv_fifobar = dma_pa + FIFOHANDLESIZE; | |
300 | dma_va += fifo_sz(NR_QENTRY); | |
301 | dma_pa += fifo_sz(NR_QENTRY); | |
302 | ||
303 | driver_ccb->ccb_u2.send_desc = dma_va; | |
304 | ilo_ccb->ccb_u2.send_desc = dma_pa; | |
305 | dma_pa += desc_mem_sz(NR_QENTRY); | |
306 | dma_va += desc_mem_sz(NR_QENTRY); | |
307 | ||
308 | driver_ccb->ccb_u4.recv_desc = dma_va; | |
309 | ilo_ccb->ccb_u4.recv_desc = dma_pa; | |
310 | ||
311 | driver_ccb->channel = slot; | |
312 | ilo_ccb->channel = slot; | |
313 | ||
314 | driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE); | |
315 | ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */ | |
316 | ||
66d5e516 DA |
317 | return 0; |
318 | } | |
319 | ||
320 | static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) | |
321 | { | |
322 | int pkt_id, pkt_sz; | |
323 | struct ccb *driver_ccb = &data->driver_ccb; | |
324 | ||
89bcb05d DA |
325 | /* copy the ccb with physical addrs to device memory */ |
326 | data->mapped_ccb = (struct ccb __iomem *) | |
327 | (hw->ram_vaddr + (slot * ILOHW_CCB_SZ)); | |
66d5e516 | 328 | memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb)); |
89bcb05d DA |
329 | |
330 | /* put packets on the send and receive queues */ | |
331 | pkt_sz = 0; | |
332 | for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) { | |
333 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz); | |
334 | doorbell_set(driver_ccb); | |
335 | } | |
336 | ||
337 | pkt_sz = desc_mem_sz(1); | |
338 | for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) | |
339 | ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz); | |
340 | ||
66d5e516 | 341 | /* the ccb is ready to use */ |
89bcb05d | 342 | doorbell_clr(driver_ccb); |
66d5e516 DA |
343 | } |
344 | ||
345 | static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data) | |
346 | { | |
347 | int pkt_id, i; | |
348 | struct ccb *driver_ccb = &data->driver_ccb; | |
89bcb05d DA |
349 | |
350 | /* make sure iLO is really handling requests */ | |
c073b2db | 351 | for (i = MAX_WAIT; i > 0; i--) { |
89bcb05d DA |
352 | if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL)) |
353 | break; | |
891f7d73 | 354 | udelay(WAIT_TIME); |
89bcb05d DA |
355 | } |
356 | ||
66d5e516 DA |
357 | if (i == 0) { |
358 | dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n"); | |
359 | return -EBUSY; | |
89bcb05d DA |
360 | } |
361 | ||
66d5e516 DA |
362 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); |
363 | doorbell_set(driver_ccb); | |
89bcb05d | 364 | return 0; |
89bcb05d DA |
365 | } |
366 | ||
367 | static inline int is_channel_reset(struct ccb *ccb) | |
368 | { | |
369 | /* check for this particular channel needing a reset */ | |
370 | return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset; | |
371 | } | |
372 | ||
373 | static inline void set_channel_reset(struct ccb *ccb) | |
374 | { | |
375 | /* set a flag indicating this channel needs a reset */ | |
376 | FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1; | |
377 | } | |
378 | ||
66d5e516 DA |
379 | static inline int get_device_outbound(struct ilo_hwinfo *hw) |
380 | { | |
381 | return ioread32(&hw->mmio_vaddr[DB_OUT]); | |
382 | } | |
383 | ||
384 | static inline int is_db_reset(int db_out) | |
385 | { | |
386 | return db_out & (1 << DB_RESET); | |
387 | } | |
388 | ||
89bcb05d DA |
389 | static inline int is_device_reset(struct ilo_hwinfo *hw) |
390 | { | |
391 | /* check for global reset condition */ | |
66d5e516 DA |
392 | return is_db_reset(get_device_outbound(hw)); |
393 | } | |
394 | ||
395 | static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr) | |
396 | { | |
397 | iowrite32(clr, &hw->mmio_vaddr[DB_OUT]); | |
89bcb05d DA |
398 | } |
399 | ||
400 | static inline void clear_device(struct ilo_hwinfo *hw) | |
401 | { | |
402 | /* clear the device (reset bits, pending channel entries) */ | |
66d5e516 | 403 | clear_pending_db(hw, -1); |
89bcb05d DA |
404 | } |
405 | ||
9f704841 DA |
406 | static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw) |
407 | { | |
408 | iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]); | |
409 | } | |
410 | ||
411 | static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw) | |
412 | { | |
413 | iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1, | |
414 | &hw->mmio_vaddr[DB_IRQ]); | |
415 | } | |
416 | ||
417 | static void ilo_set_reset(struct ilo_hwinfo *hw) | |
89bcb05d DA |
418 | { |
419 | int slot; | |
420 | ||
421 | /* | |
422 | * Mapped memory is zeroed on ilo reset, so set a per ccb flag | |
423 | * to indicate that this ccb needs to be closed and reopened. | |
424 | */ | |
425 | for (slot = 0; slot < MAX_CCB; slot++) { | |
426 | if (!hw->ccb_alloc[slot]) | |
427 | continue; | |
428 | set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb); | |
429 | } | |
89bcb05d DA |
430 | } |
431 | ||
432 | static ssize_t ilo_read(struct file *fp, char __user *buf, | |
433 | size_t len, loff_t *off) | |
434 | { | |
435 | int err, found, cnt, pkt_id, pkt_len; | |
66d5e516 DA |
436 | struct ccb_data *data = fp->private_data; |
437 | struct ccb *driver_ccb = &data->driver_ccb; | |
438 | struct ilo_hwinfo *hw = data->ilo_hw; | |
89bcb05d DA |
439 | void *pkt; |
440 | ||
9f704841 | 441 | if (is_channel_reset(driver_ccb)) { |
89bcb05d DA |
442 | /* |
443 | * If the device has been reset, applications | |
444 | * need to close and reopen all ccbs. | |
445 | */ | |
89bcb05d DA |
446 | return -ENODEV; |
447 | } | |
448 | ||
449 | /* | |
450 | * This function is to be called when data is expected | |
451 | * in the channel, and will return an error if no packet is found | |
452 | * during the loop below. The sleep/retry logic is to allow | |
453 | * applications to call read() immediately post write(), | |
454 | * and give iLO some time to process the sent packet. | |
455 | */ | |
456 | cnt = 20; | |
457 | do { | |
458 | /* look for a received packet */ | |
459 | found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id, | |
460 | &pkt_len, &pkt); | |
461 | if (found) | |
462 | break; | |
463 | cnt--; | |
464 | msleep(100); | |
465 | } while (!found && cnt); | |
466 | ||
467 | if (!found) | |
468 | return -EAGAIN; | |
469 | ||
470 | /* only copy the length of the received packet */ | |
471 | if (pkt_len < len) | |
472 | len = pkt_len; | |
473 | ||
474 | err = copy_to_user(buf, pkt, len); | |
475 | ||
476 | /* return the received packet to the queue */ | |
477 | ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1)); | |
478 | ||
479 | return err ? -EFAULT : len; | |
480 | } | |
481 | ||
482 | static ssize_t ilo_write(struct file *fp, const char __user *buf, | |
483 | size_t len, loff_t *off) | |
484 | { | |
485 | int err, pkt_id, pkt_len; | |
66d5e516 DA |
486 | struct ccb_data *data = fp->private_data; |
487 | struct ccb *driver_ccb = &data->driver_ccb; | |
488 | struct ilo_hwinfo *hw = data->ilo_hw; | |
89bcb05d DA |
489 | void *pkt; |
490 | ||
9f704841 | 491 | if (is_channel_reset(driver_ccb)) |
89bcb05d | 492 | return -ENODEV; |
89bcb05d DA |
493 | |
494 | /* get a packet to send the user command */ | |
495 | if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt)) | |
496 | return -EBUSY; | |
497 | ||
498 | /* limit the length to the length of the packet */ | |
499 | if (pkt_len < len) | |
500 | len = pkt_len; | |
501 | ||
502 | /* on failure, set the len to 0 to return empty packet to the device */ | |
503 | err = copy_from_user(pkt, buf, len); | |
504 | if (err) | |
505 | len = 0; | |
506 | ||
507 | /* send the packet */ | |
508 | ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len); | |
509 | doorbell_set(driver_ccb); | |
510 | ||
511 | return err ? -EFAULT : len; | |
512 | } | |
513 | ||
4a351471 DA |
514 | static unsigned int ilo_poll(struct file *fp, poll_table *wait) |
515 | { | |
516 | struct ccb_data *data = fp->private_data; | |
517 | struct ccb *driver_ccb = &data->driver_ccb; | |
518 | ||
519 | poll_wait(fp, &data->ccb_waitq, wait); | |
520 | ||
521 | if (is_channel_reset(driver_ccb)) | |
522 | return POLLERR; | |
523 | else if (ilo_pkt_recv(data->ilo_hw, driver_ccb)) | |
524 | return POLLIN | POLLRDNORM; | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
89bcb05d DA |
529 | static int ilo_close(struct inode *ip, struct file *fp) |
530 | { | |
531 | int slot; | |
532 | struct ccb_data *data; | |
533 | struct ilo_hwinfo *hw; | |
9f704841 | 534 | unsigned long flags; |
89bcb05d DA |
535 | |
536 | slot = iminor(ip) % MAX_CCB; | |
537 | hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); | |
538 | ||
9f704841 | 539 | spin_lock(&hw->open_lock); |
89bcb05d DA |
540 | |
541 | if (hw->ccb_alloc[slot]->ccb_cnt == 1) { | |
542 | ||
543 | data = fp->private_data; | |
544 | ||
9f704841 DA |
545 | spin_lock_irqsave(&hw->alloc_lock, flags); |
546 | hw->ccb_alloc[slot] = NULL; | |
547 | spin_unlock_irqrestore(&hw->alloc_lock, flags); | |
548 | ||
89bcb05d DA |
549 | ilo_ccb_close(hw->ilo_dev, data); |
550 | ||
551 | kfree(data); | |
89bcb05d DA |
552 | } else |
553 | hw->ccb_alloc[slot]->ccb_cnt--; | |
554 | ||
9f704841 | 555 | spin_unlock(&hw->open_lock); |
89bcb05d DA |
556 | |
557 | return 0; | |
558 | } | |
559 | ||
560 | static int ilo_open(struct inode *ip, struct file *fp) | |
561 | { | |
562 | int slot, error; | |
563 | struct ccb_data *data; | |
564 | struct ilo_hwinfo *hw; | |
9f704841 | 565 | unsigned long flags; |
89bcb05d DA |
566 | |
567 | slot = iminor(ip) % MAX_CCB; | |
568 | hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev); | |
569 | ||
570 | /* new ccb allocation */ | |
571 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
572 | if (!data) | |
573 | return -ENOMEM; | |
574 | ||
9f704841 | 575 | spin_lock(&hw->open_lock); |
89bcb05d DA |
576 | |
577 | /* each fd private_data holds sw/hw view of ccb */ | |
578 | if (hw->ccb_alloc[slot] == NULL) { | |
579 | /* create a channel control block for this minor */ | |
66d5e516 DA |
580 | error = ilo_ccb_setup(hw, data, slot); |
581 | if (error) { | |
89bcb05d | 582 | kfree(data); |
66d5e516 DA |
583 | goto out; |
584 | } | |
585 | ||
9f704841 DA |
586 | data->ccb_cnt = 1; |
587 | data->ccb_excl = fp->f_flags & O_EXCL; | |
588 | data->ilo_hw = hw; | |
589 | init_waitqueue_head(&data->ccb_waitq); | |
590 | ||
66d5e516 | 591 | /* write the ccb to hw */ |
9f704841 | 592 | spin_lock_irqsave(&hw->alloc_lock, flags); |
66d5e516 | 593 | ilo_ccb_open(hw, data, slot); |
9f704841 DA |
594 | hw->ccb_alloc[slot] = data; |
595 | spin_unlock_irqrestore(&hw->alloc_lock, flags); | |
66d5e516 DA |
596 | |
597 | /* make sure the channel is functional */ | |
598 | error = ilo_ccb_verify(hw, data); | |
599 | if (error) { | |
9f704841 DA |
600 | |
601 | spin_lock_irqsave(&hw->alloc_lock, flags); | |
602 | hw->ccb_alloc[slot] = NULL; | |
603 | spin_unlock_irqrestore(&hw->alloc_lock, flags); | |
604 | ||
66d5e516 | 605 | ilo_ccb_close(hw->ilo_dev, data); |
9f704841 | 606 | |
66d5e516 DA |
607 | kfree(data); |
608 | goto out; | |
609 | } | |
610 | ||
89bcb05d DA |
611 | } else { |
612 | kfree(data); | |
613 | if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) { | |
614 | /* | |
615 | * The channel exists, and either this open | |
616 | * or a previous open of this channel wants | |
617 | * exclusive access. | |
618 | */ | |
619 | error = -EBUSY; | |
620 | } else { | |
621 | hw->ccb_alloc[slot]->ccb_cnt++; | |
622 | error = 0; | |
623 | } | |
624 | } | |
66d5e516 | 625 | out: |
9f704841 | 626 | spin_unlock(&hw->open_lock); |
89bcb05d DA |
627 | |
628 | if (!error) | |
629 | fp->private_data = hw->ccb_alloc[slot]; | |
630 | ||
631 | return error; | |
632 | } | |
633 | ||
634 | static const struct file_operations ilo_fops = { | |
635 | .owner = THIS_MODULE, | |
636 | .read = ilo_read, | |
637 | .write = ilo_write, | |
4a351471 | 638 | .poll = ilo_poll, |
89bcb05d DA |
639 | .open = ilo_open, |
640 | .release = ilo_close, | |
641 | }; | |
642 | ||
9f704841 DA |
643 | static irqreturn_t ilo_isr(int irq, void *data) |
644 | { | |
645 | struct ilo_hwinfo *hw = data; | |
646 | int pending, i; | |
647 | ||
648 | spin_lock(&hw->alloc_lock); | |
649 | ||
650 | /* check for ccbs which have data */ | |
651 | pending = get_device_outbound(hw); | |
652 | if (!pending) { | |
653 | spin_unlock(&hw->alloc_lock); | |
654 | return IRQ_NONE; | |
655 | } | |
656 | ||
657 | if (is_db_reset(pending)) { | |
658 | /* wake up all ccbs if the device was reset */ | |
659 | pending = -1; | |
660 | ilo_set_reset(hw); | |
661 | } | |
662 | ||
663 | for (i = 0; i < MAX_CCB; i++) { | |
664 | if (!hw->ccb_alloc[i]) | |
665 | continue; | |
666 | if (pending & (1 << i)) | |
667 | wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq); | |
668 | } | |
669 | ||
670 | /* clear the device of the channels that have been handled */ | |
671 | clear_pending_db(hw, pending); | |
672 | ||
673 | spin_unlock(&hw->alloc_lock); | |
674 | ||
675 | return IRQ_HANDLED; | |
676 | } | |
677 | ||
89bcb05d DA |
678 | static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) |
679 | { | |
680 | pci_iounmap(pdev, hw->db_vaddr); | |
681 | pci_iounmap(pdev, hw->ram_vaddr); | |
682 | pci_iounmap(pdev, hw->mmio_vaddr); | |
683 | } | |
684 | ||
685 | static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw) | |
686 | { | |
687 | int error = -ENOMEM; | |
688 | ||
689 | /* map the memory mapped i/o registers */ | |
690 | hw->mmio_vaddr = pci_iomap(pdev, 1, 0); | |
691 | if (hw->mmio_vaddr == NULL) { | |
692 | dev_err(&pdev->dev, "Error mapping mmio\n"); | |
693 | goto out; | |
694 | } | |
695 | ||
696 | /* map the adapter shared memory region */ | |
697 | hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ); | |
698 | if (hw->ram_vaddr == NULL) { | |
699 | dev_err(&pdev->dev, "Error mapping shared mem\n"); | |
700 | goto mmio_free; | |
701 | } | |
702 | ||
703 | /* map the doorbell aperture */ | |
704 | hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE); | |
705 | if (hw->db_vaddr == NULL) { | |
706 | dev_err(&pdev->dev, "Error mapping doorbell\n"); | |
707 | goto ram_free; | |
708 | } | |
709 | ||
710 | return 0; | |
711 | ram_free: | |
712 | pci_iounmap(pdev, hw->ram_vaddr); | |
713 | mmio_free: | |
714 | pci_iounmap(pdev, hw->mmio_vaddr); | |
715 | out: | |
716 | return error; | |
717 | } | |
718 | ||
719 | static void ilo_remove(struct pci_dev *pdev) | |
720 | { | |
721 | int i, minor; | |
722 | struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev); | |
723 | ||
724 | clear_device(ilo_hw); | |
725 | ||
726 | minor = MINOR(ilo_hw->cdev.dev); | |
727 | for (i = minor; i < minor + MAX_CCB; i++) | |
728 | device_destroy(ilo_class, MKDEV(ilo_major, i)); | |
729 | ||
730 | cdev_del(&ilo_hw->cdev); | |
9f704841 DA |
731 | ilo_disable_interrupts(ilo_hw); |
732 | free_irq(pdev->irq, ilo_hw); | |
89bcb05d DA |
733 | ilo_unmap_device(pdev, ilo_hw); |
734 | pci_release_regions(pdev); | |
735 | pci_disable_device(pdev); | |
736 | kfree(ilo_hw); | |
737 | ilo_hwdev[(minor / MAX_CCB)] = 0; | |
738 | } | |
739 | ||
740 | static int __devinit ilo_probe(struct pci_dev *pdev, | |
741 | const struct pci_device_id *ent) | |
742 | { | |
743 | int devnum, minor, start, error; | |
744 | struct ilo_hwinfo *ilo_hw; | |
745 | ||
746 | /* find a free range for device files */ | |
747 | for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) { | |
748 | if (ilo_hwdev[devnum] == 0) { | |
749 | ilo_hwdev[devnum] = 1; | |
750 | break; | |
751 | } | |
752 | } | |
753 | ||
754 | if (devnum == MAX_ILO_DEV) { | |
755 | dev_err(&pdev->dev, "Error finding free device\n"); | |
756 | return -ENODEV; | |
757 | } | |
758 | ||
759 | /* track global allocations for this device */ | |
760 | error = -ENOMEM; | |
761 | ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL); | |
762 | if (!ilo_hw) | |
763 | goto out; | |
764 | ||
765 | ilo_hw->ilo_dev = pdev; | |
766 | spin_lock_init(&ilo_hw->alloc_lock); | |
767 | spin_lock_init(&ilo_hw->fifo_lock); | |
9f704841 | 768 | spin_lock_init(&ilo_hw->open_lock); |
89bcb05d DA |
769 | |
770 | error = pci_enable_device(pdev); | |
771 | if (error) | |
772 | goto free; | |
773 | ||
774 | pci_set_master(pdev); | |
775 | ||
776 | error = pci_request_regions(pdev, ILO_NAME); | |
777 | if (error) | |
778 | goto disable; | |
779 | ||
780 | error = ilo_map_device(pdev, ilo_hw); | |
781 | if (error) | |
782 | goto free_regions; | |
783 | ||
784 | pci_set_drvdata(pdev, ilo_hw); | |
785 | clear_device(ilo_hw); | |
786 | ||
9f704841 DA |
787 | error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw); |
788 | if (error) | |
789 | goto unmap; | |
790 | ||
791 | ilo_enable_interrupts(ilo_hw); | |
792 | ||
89bcb05d DA |
793 | cdev_init(&ilo_hw->cdev, &ilo_fops); |
794 | ilo_hw->cdev.owner = THIS_MODULE; | |
795 | start = devnum * MAX_CCB; | |
796 | error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB); | |
797 | if (error) { | |
798 | dev_err(&pdev->dev, "Could not add cdev\n"); | |
9f704841 | 799 | goto remove_isr; |
89bcb05d DA |
800 | } |
801 | ||
802 | for (minor = 0 ; minor < MAX_CCB; minor++) { | |
803 | struct device *dev; | |
804 | dev = device_create(ilo_class, &pdev->dev, | |
805 | MKDEV(ilo_major, minor), NULL, | |
806 | "hpilo!d%dccb%d", devnum, minor); | |
807 | if (IS_ERR(dev)) | |
808 | dev_err(&pdev->dev, "Could not create files\n"); | |
809 | } | |
810 | ||
811 | return 0; | |
9f704841 DA |
812 | remove_isr: |
813 | ilo_disable_interrupts(ilo_hw); | |
814 | free_irq(pdev->irq, ilo_hw); | |
89bcb05d DA |
815 | unmap: |
816 | ilo_unmap_device(pdev, ilo_hw); | |
817 | free_regions: | |
818 | pci_release_regions(pdev); | |
819 | disable: | |
820 | pci_disable_device(pdev); | |
821 | free: | |
822 | kfree(ilo_hw); | |
823 | out: | |
824 | ilo_hwdev[devnum] = 0; | |
825 | return error; | |
826 | } | |
827 | ||
828 | static struct pci_device_id ilo_devices[] = { | |
829 | { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) }, | |
31d8b563 | 830 | { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) }, |
89bcb05d DA |
831 | { } |
832 | }; | |
833 | MODULE_DEVICE_TABLE(pci, ilo_devices); | |
834 | ||
835 | static struct pci_driver ilo_driver = { | |
836 | .name = ILO_NAME, | |
837 | .id_table = ilo_devices, | |
838 | .probe = ilo_probe, | |
839 | .remove = __devexit_p(ilo_remove), | |
840 | }; | |
841 | ||
842 | static int __init ilo_init(void) | |
843 | { | |
844 | int error; | |
845 | dev_t dev; | |
846 | ||
847 | ilo_class = class_create(THIS_MODULE, "iLO"); | |
848 | if (IS_ERR(ilo_class)) { | |
849 | error = PTR_ERR(ilo_class); | |
850 | goto out; | |
851 | } | |
852 | ||
853 | error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME); | |
854 | if (error) | |
855 | goto class_destroy; | |
856 | ||
857 | ilo_major = MAJOR(dev); | |
858 | ||
859 | error = pci_register_driver(&ilo_driver); | |
860 | if (error) | |
861 | goto chr_remove; | |
862 | ||
863 | return 0; | |
864 | chr_remove: | |
865 | unregister_chrdev_region(dev, MAX_OPEN); | |
866 | class_destroy: | |
867 | class_destroy(ilo_class); | |
868 | out: | |
869 | return error; | |
870 | } | |
871 | ||
872 | static void __exit ilo_exit(void) | |
873 | { | |
874 | pci_unregister_driver(&ilo_driver); | |
875 | unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN); | |
876 | class_destroy(ilo_class); | |
877 | } | |
878 | ||
4a351471 | 879 | MODULE_VERSION("1.2"); |
89bcb05d DA |
880 | MODULE_ALIAS(ILO_NAME); |
881 | MODULE_DESCRIPTION(ILO_NAME); | |
882 | MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>"); | |
883 | MODULE_LICENSE("GPL v2"); | |
884 | ||
885 | module_init(ilo_init); | |
886 | module_exit(ilo_exit); |