blob: 98ad0120aa9bc6a134af1a5da728f0c6d8f9c8c8 [file] [log] [blame]
David Altobelli89bcb052008-07-02 09:38:53 -06001/*
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>
David Altobelli9f704842009-08-17 17:07:33 -060016#include <linux/interrupt.h>
David Altobelli89bcb052008-07-02 09:38:53 -060017#include <linux/ioport.h>
18#include <linux/device.h>
19#include <linux/file.h>
20#include <linux/cdev.h>
Alexey Dobriyand43c36d2009-10-07 17:09:06 +040021#include <linux/sched.h>
David Altobelli89bcb052008-07-02 09:38:53 -060022#include <linux/spinlock.h>
23#include <linux/delay.h>
24#include <linux/uaccess.h>
25#include <linux/io.h>
David Altobelli9f704842009-08-17 17:07:33 -060026#include <linux/wait.h>
David Altobelli4a351472009-08-17 17:08:01 -060027#include <linux/poll.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
David Altobelli89bcb052008-07-02 09:38:53 -060029#include "hpilo.h"
30
31static struct class *ilo_class;
32static unsigned int ilo_major;
33static char ilo_hwdev[MAX_ILO_DEV];
34
35static inline int get_entry_id(int entry)
36{
37 return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
38}
39
40static inline int get_entry_len(int entry)
41{
42 return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
43}
44
45static inline int mk_entry(int id, int len)
46{
47 int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
48 return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
49}
50
51static inline int desc_mem_sz(int nr_entry)
52{
53 return nr_entry << L2_QENTRY_SZ;
54}
55
56/*
57 * FIFO queues, shared with hardware.
58 *
59 * If a queue has empty slots, an entry is added to the queue tail,
60 * and that entry is marked as occupied.
61 * Entries can be dequeued from the head of the list, when the device
62 * has marked the entry as consumed.
63 *
64 * Returns true on successful queue/dequeue, false on failure.
65 */
66static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
67{
68 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
David Altobelli9f704842009-08-17 17:07:33 -060069 unsigned long flags;
David Altobelli89bcb052008-07-02 09:38:53 -060070 int ret = 0;
71
David Altobelli9f704842009-08-17 17:07:33 -060072 spin_lock_irqsave(&hw->fifo_lock, flags);
David Altobelli89bcb052008-07-02 09:38:53 -060073 if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
74 & ENTRY_MASK_O)) {
75 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
76 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
77 fifo_q->tail += 1;
78 ret = 1;
79 }
David Altobelli9f704842009-08-17 17:07:33 -060080 spin_unlock_irqrestore(&hw->fifo_lock, flags);
David Altobelli89bcb052008-07-02 09:38:53 -060081
82 return ret;
83}
84
85static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
86{
87 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
David Altobelli9f704842009-08-17 17:07:33 -060088 unsigned long flags;
David Altobelli89bcb052008-07-02 09:38:53 -060089 int ret = 0;
90 u64 c;
91
David Altobelli9f704842009-08-17 17:07:33 -060092 spin_lock_irqsave(&hw->fifo_lock, flags);
David Altobelli89bcb052008-07-02 09:38:53 -060093 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
94 if (c & ENTRY_MASK_C) {
95 if (entry)
96 *entry = c & ENTRY_MASK_NOSTATE;
97
98 fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
99 (c | ENTRY_MASK) + 1;
100 fifo_q->head += 1;
101 ret = 1;
102 }
David Altobelli9f704842009-08-17 17:07:33 -0600103 spin_unlock_irqrestore(&hw->fifo_lock, flags);
David Altobelli89bcb052008-07-02 09:38:53 -0600104
105 return ret;
106}
107
David Altobelli4a351472009-08-17 17:08:01 -0600108static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
109{
110 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
111 unsigned long flags;
112 int ret = 0;
113 u64 c;
114
115 spin_lock_irqsave(&hw->fifo_lock, flags);
116 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
117 if (c & ENTRY_MASK_C)
118 ret = 1;
119 spin_unlock_irqrestore(&hw->fifo_lock, flags);
120
121 return ret;
122}
123
David Altobelli89bcb052008-07-02 09:38:53 -0600124static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
125 int dir, int id, int len)
126{
127 char *fifobar;
128 int entry;
129
130 if (dir == SENDQ)
131 fifobar = ccb->ccb_u1.send_fifobar;
132 else
133 fifobar = ccb->ccb_u3.recv_fifobar;
134
135 entry = mk_entry(id, len);
136 return fifo_enqueue(hw, fifobar, entry);
137}
138
139static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
140 int dir, int *id, int *len, void **pkt)
141{
142 char *fifobar, *desc;
143 int entry = 0, pkt_id = 0;
144 int ret;
145
146 if (dir == SENDQ) {
147 fifobar = ccb->ccb_u1.send_fifobar;
148 desc = ccb->ccb_u2.send_desc;
149 } else {
150 fifobar = ccb->ccb_u3.recv_fifobar;
151 desc = ccb->ccb_u4.recv_desc;
152 }
153
154 ret = fifo_dequeue(hw, fifobar, &entry);
155 if (ret) {
156 pkt_id = get_entry_id(entry);
157 if (id)
158 *id = pkt_id;
159 if (len)
160 *len = get_entry_len(entry);
161 if (pkt)
162 *pkt = (void *)(desc + desc_mem_sz(pkt_id));
163 }
164
165 return ret;
166}
167
David Altobelli4a351472009-08-17 17:08:01 -0600168static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
169{
170 char *fifobar = ccb->ccb_u3.recv_fifobar;
171
172 return fifo_check_recv(hw, fifobar);
173}
174
David Altobelli89bcb052008-07-02 09:38:53 -0600175static inline void doorbell_set(struct ccb *ccb)
176{
177 iowrite8(1, ccb->ccb_u5.db_base);
178}
179
180static inline void doorbell_clr(struct ccb *ccb)
181{
182 iowrite8(2, ccb->ccb_u5.db_base);
183}
David Altobelli66d5e512009-08-17 17:07:03 -0600184
David Altobelli89bcb052008-07-02 09:38:53 -0600185static inline int ctrl_set(int l2sz, int idxmask, int desclim)
186{
187 int active = 0, go = 1;
188 return l2sz << CTRL_BITPOS_L2SZ |
189 idxmask << CTRL_BITPOS_FIFOINDEXMASK |
190 desclim << CTRL_BITPOS_DESCLIMIT |
191 active << CTRL_BITPOS_A |
192 go << CTRL_BITPOS_G;
193}
David Altobelli66d5e512009-08-17 17:07:03 -0600194
David Altobelli89bcb052008-07-02 09:38:53 -0600195static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
196{
197 /* for simplicity, use the same parameters for send and recv ctrls */
198 ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
199 ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
200}
201
202static inline int fifo_sz(int nr_entry)
203{
204 /* size of a fifo is determined by the number of entries it contains */
205 return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE;
206}
207
208static void fifo_setup(void *base_addr, int nr_entry)
209{
210 struct fifo *fifo_q = base_addr;
211 int i;
212
213 /* set up an empty fifo */
214 fifo_q->head = 0;
215 fifo_q->tail = 0;
216 fifo_q->reset = 0;
217 fifo_q->nrents = nr_entry;
218 fifo_q->imask = nr_entry - 1;
219 fifo_q->merge = ENTRY_MASK_O;
220
221 for (i = 0; i < nr_entry; i++)
222 fifo_q->fifobar[i] = 0;
223}
224
225static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
226{
David Altobelli66d5e512009-08-17 17:07:03 -0600227 struct ccb *driver_ccb = &data->driver_ccb;
228 struct ccb __iomem *device_ccb = data->mapped_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600229 int retries;
230
David Altobelli89bcb052008-07-02 09:38:53 -0600231 /* complicated dance to tell the hw we are stopping */
232 doorbell_clr(driver_ccb);
233 iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
234 &device_ccb->send_ctrl);
235 iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
236 &device_ccb->recv_ctrl);
237
238 /* give iLO some time to process stop request */
David Altobellic073b2d2009-02-04 15:11:58 -0800239 for (retries = MAX_WAIT; retries > 0; retries--) {
David Altobelli89bcb052008-07-02 09:38:53 -0600240 doorbell_set(driver_ccb);
David Altobelli891f7d72009-03-31 15:23:53 -0700241 udelay(WAIT_TIME);
David Altobelli89bcb052008-07-02 09:38:53 -0600242 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
243 &&
244 !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
245 break;
246 }
247 if (retries == 0)
248 dev_err(&pdev->dev, "Closing, but controller still active\n");
249
250 /* clear the hw ccb */
251 memset_io(device_ccb, 0, sizeof(struct ccb));
252
253 /* free resources used to back send/recv queues */
254 pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
255}
256
David Altobelli66d5e512009-08-17 17:07:03 -0600257static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
David Altobelli89bcb052008-07-02 09:38:53 -0600258{
259 char *dma_va, *dma_pa;
David Altobelli89bcb052008-07-02 09:38:53 -0600260 struct ccb *driver_ccb, *ilo_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600261
262 driver_ccb = &data->driver_ccb;
263 ilo_ccb = &data->ilo_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600264
265 data->dma_size = 2 * fifo_sz(NR_QENTRY) +
266 2 * desc_mem_sz(NR_QENTRY) +
267 ILO_START_ALIGN + ILO_CACHE_SZ;
268
David Altobelli66d5e512009-08-17 17:07:03 -0600269 data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size,
David Altobelli89bcb052008-07-02 09:38:53 -0600270 &data->dma_pa);
271 if (!data->dma_va)
David Altobelli66d5e512009-08-17 17:07:03 -0600272 return -ENOMEM;
David Altobelli89bcb052008-07-02 09:38:53 -0600273
274 dma_va = (char *)data->dma_va;
275 dma_pa = (char *)data->dma_pa;
276
277 memset(dma_va, 0, data->dma_size);
278
279 dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
280 dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_START_ALIGN);
281
282 /*
283 * Create two ccb's, one with virt addrs, one with phys addrs.
284 * Copy the phys addr ccb to device shared mem.
285 */
286 ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
287 ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
288
289 fifo_setup(dma_va, NR_QENTRY);
290 driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
291 ilo_ccb->ccb_u1.send_fifobar = dma_pa + FIFOHANDLESIZE;
292 dma_va += fifo_sz(NR_QENTRY);
293 dma_pa += fifo_sz(NR_QENTRY);
294
295 dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
296 dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_CACHE_SZ);
297
298 fifo_setup(dma_va, NR_QENTRY);
299 driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
300 ilo_ccb->ccb_u3.recv_fifobar = dma_pa + FIFOHANDLESIZE;
301 dma_va += fifo_sz(NR_QENTRY);
302 dma_pa += fifo_sz(NR_QENTRY);
303
304 driver_ccb->ccb_u2.send_desc = dma_va;
305 ilo_ccb->ccb_u2.send_desc = dma_pa;
306 dma_pa += desc_mem_sz(NR_QENTRY);
307 dma_va += desc_mem_sz(NR_QENTRY);
308
309 driver_ccb->ccb_u4.recv_desc = dma_va;
310 ilo_ccb->ccb_u4.recv_desc = dma_pa;
311
312 driver_ccb->channel = slot;
313 ilo_ccb->channel = slot;
314
315 driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
316 ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
317
David Altobelli66d5e512009-08-17 17:07:03 -0600318 return 0;
319}
320
321static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
322{
323 int pkt_id, pkt_sz;
324 struct ccb *driver_ccb = &data->driver_ccb;
325
David Altobelli89bcb052008-07-02 09:38:53 -0600326 /* copy the ccb with physical addrs to device memory */
327 data->mapped_ccb = (struct ccb __iomem *)
328 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
David Altobelli66d5e512009-08-17 17:07:03 -0600329 memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
David Altobelli89bcb052008-07-02 09:38:53 -0600330
331 /* put packets on the send and receive queues */
332 pkt_sz = 0;
333 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
334 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
335 doorbell_set(driver_ccb);
336 }
337
338 pkt_sz = desc_mem_sz(1);
339 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
340 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
341
David Altobelli66d5e512009-08-17 17:07:03 -0600342 /* the ccb is ready to use */
David Altobelli89bcb052008-07-02 09:38:53 -0600343 doorbell_clr(driver_ccb);
David Altobelli66d5e512009-08-17 17:07:03 -0600344}
345
346static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
347{
348 int pkt_id, i;
349 struct ccb *driver_ccb = &data->driver_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600350
351 /* make sure iLO is really handling requests */
David Altobellic073b2d2009-02-04 15:11:58 -0800352 for (i = MAX_WAIT; i > 0; i--) {
David Altobelli89bcb052008-07-02 09:38:53 -0600353 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
354 break;
David Altobelli891f7d72009-03-31 15:23:53 -0700355 udelay(WAIT_TIME);
David Altobelli89bcb052008-07-02 09:38:53 -0600356 }
357
David Altobelli66d5e512009-08-17 17:07:03 -0600358 if (i == 0) {
359 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
360 return -EBUSY;
David Altobelli89bcb052008-07-02 09:38:53 -0600361 }
362
David Altobelli66d5e512009-08-17 17:07:03 -0600363 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
364 doorbell_set(driver_ccb);
David Altobelli89bcb052008-07-02 09:38:53 -0600365 return 0;
David Altobelli89bcb052008-07-02 09:38:53 -0600366}
367
368static inline int is_channel_reset(struct ccb *ccb)
369{
370 /* check for this particular channel needing a reset */
371 return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
372}
373
374static inline void set_channel_reset(struct ccb *ccb)
375{
376 /* set a flag indicating this channel needs a reset */
377 FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
378}
379
David Altobelli66d5e512009-08-17 17:07:03 -0600380static inline int get_device_outbound(struct ilo_hwinfo *hw)
381{
382 return ioread32(&hw->mmio_vaddr[DB_OUT]);
383}
384
385static inline int is_db_reset(int db_out)
386{
387 return db_out & (1 << DB_RESET);
388}
389
David Altobelli89bcb052008-07-02 09:38:53 -0600390static inline int is_device_reset(struct ilo_hwinfo *hw)
391{
392 /* check for global reset condition */
David Altobelli66d5e512009-08-17 17:07:03 -0600393 return is_db_reset(get_device_outbound(hw));
394}
395
396static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
397{
398 iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
David Altobelli89bcb052008-07-02 09:38:53 -0600399}
400
401static inline void clear_device(struct ilo_hwinfo *hw)
402{
403 /* clear the device (reset bits, pending channel entries) */
David Altobelli66d5e512009-08-17 17:07:03 -0600404 clear_pending_db(hw, -1);
David Altobelli89bcb052008-07-02 09:38:53 -0600405}
406
David Altobelli9f704842009-08-17 17:07:33 -0600407static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
408{
409 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
410}
411
412static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
413{
414 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
415 &hw->mmio_vaddr[DB_IRQ]);
416}
417
418static void ilo_set_reset(struct ilo_hwinfo *hw)
David Altobelli89bcb052008-07-02 09:38:53 -0600419{
420 int slot;
421
422 /*
423 * Mapped memory is zeroed on ilo reset, so set a per ccb flag
424 * to indicate that this ccb needs to be closed and reopened.
425 */
426 for (slot = 0; slot < MAX_CCB; slot++) {
427 if (!hw->ccb_alloc[slot])
428 continue;
429 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
430 }
David Altobelli89bcb052008-07-02 09:38:53 -0600431}
432
433static ssize_t ilo_read(struct file *fp, char __user *buf,
434 size_t len, loff_t *off)
435{
436 int err, found, cnt, pkt_id, pkt_len;
David Altobelli66d5e512009-08-17 17:07:03 -0600437 struct ccb_data *data = fp->private_data;
438 struct ccb *driver_ccb = &data->driver_ccb;
439 struct ilo_hwinfo *hw = data->ilo_hw;
David Altobelli89bcb052008-07-02 09:38:53 -0600440 void *pkt;
441
David Altobelli9f704842009-08-17 17:07:33 -0600442 if (is_channel_reset(driver_ccb)) {
David Altobelli89bcb052008-07-02 09:38:53 -0600443 /*
444 * If the device has been reset, applications
445 * need to close and reopen all ccbs.
446 */
David Altobelli89bcb052008-07-02 09:38:53 -0600447 return -ENODEV;
448 }
449
450 /*
451 * This function is to be called when data is expected
452 * in the channel, and will return an error if no packet is found
453 * during the loop below. The sleep/retry logic is to allow
454 * applications to call read() immediately post write(),
455 * and give iLO some time to process the sent packet.
456 */
457 cnt = 20;
458 do {
459 /* look for a received packet */
460 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
461 &pkt_len, &pkt);
462 if (found)
463 break;
464 cnt--;
465 msleep(100);
466 } while (!found && cnt);
467
468 if (!found)
469 return -EAGAIN;
470
471 /* only copy the length of the received packet */
472 if (pkt_len < len)
473 len = pkt_len;
474
475 err = copy_to_user(buf, pkt, len);
476
477 /* return the received packet to the queue */
478 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
479
480 return err ? -EFAULT : len;
481}
482
483static ssize_t ilo_write(struct file *fp, const char __user *buf,
484 size_t len, loff_t *off)
485{
486 int err, pkt_id, pkt_len;
David Altobelli66d5e512009-08-17 17:07:03 -0600487 struct ccb_data *data = fp->private_data;
488 struct ccb *driver_ccb = &data->driver_ccb;
489 struct ilo_hwinfo *hw = data->ilo_hw;
David Altobelli89bcb052008-07-02 09:38:53 -0600490 void *pkt;
491
David Altobelli9f704842009-08-17 17:07:33 -0600492 if (is_channel_reset(driver_ccb))
David Altobelli89bcb052008-07-02 09:38:53 -0600493 return -ENODEV;
David Altobelli89bcb052008-07-02 09:38:53 -0600494
495 /* get a packet to send the user command */
496 if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
497 return -EBUSY;
498
499 /* limit the length to the length of the packet */
500 if (pkt_len < len)
501 len = pkt_len;
502
503 /* on failure, set the len to 0 to return empty packet to the device */
504 err = copy_from_user(pkt, buf, len);
505 if (err)
506 len = 0;
507
508 /* send the packet */
509 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
510 doorbell_set(driver_ccb);
511
512 return err ? -EFAULT : len;
513}
514
David Altobelli4a351472009-08-17 17:08:01 -0600515static unsigned int ilo_poll(struct file *fp, poll_table *wait)
516{
517 struct ccb_data *data = fp->private_data;
518 struct ccb *driver_ccb = &data->driver_ccb;
519
520 poll_wait(fp, &data->ccb_waitq, wait);
521
522 if (is_channel_reset(driver_ccb))
523 return POLLERR;
524 else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
525 return POLLIN | POLLRDNORM;
526
527 return 0;
528}
529
David Altobelli89bcb052008-07-02 09:38:53 -0600530static int ilo_close(struct inode *ip, struct file *fp)
531{
532 int slot;
533 struct ccb_data *data;
534 struct ilo_hwinfo *hw;
David Altobelli9f704842009-08-17 17:07:33 -0600535 unsigned long flags;
David Altobelli89bcb052008-07-02 09:38:53 -0600536
537 slot = iminor(ip) % MAX_CCB;
538 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
539
David Altobelli9f704842009-08-17 17:07:33 -0600540 spin_lock(&hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600541
542 if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
543
544 data = fp->private_data;
545
David Altobelli9f704842009-08-17 17:07:33 -0600546 spin_lock_irqsave(&hw->alloc_lock, flags);
547 hw->ccb_alloc[slot] = NULL;
548 spin_unlock_irqrestore(&hw->alloc_lock, flags);
549
David Altobelli89bcb052008-07-02 09:38:53 -0600550 ilo_ccb_close(hw->ilo_dev, data);
551
552 kfree(data);
David Altobelli89bcb052008-07-02 09:38:53 -0600553 } else
554 hw->ccb_alloc[slot]->ccb_cnt--;
555
David Altobelli9f704842009-08-17 17:07:33 -0600556 spin_unlock(&hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600557
558 return 0;
559}
560
561static int ilo_open(struct inode *ip, struct file *fp)
562{
563 int slot, error;
564 struct ccb_data *data;
565 struct ilo_hwinfo *hw;
David Altobelli9f704842009-08-17 17:07:33 -0600566 unsigned long flags;
David Altobelli89bcb052008-07-02 09:38:53 -0600567
568 slot = iminor(ip) % MAX_CCB;
569 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
570
571 /* new ccb allocation */
572 data = kzalloc(sizeof(*data), GFP_KERNEL);
573 if (!data)
574 return -ENOMEM;
575
David Altobelli9f704842009-08-17 17:07:33 -0600576 spin_lock(&hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600577
578 /* each fd private_data holds sw/hw view of ccb */
579 if (hw->ccb_alloc[slot] == NULL) {
580 /* create a channel control block for this minor */
David Altobelli66d5e512009-08-17 17:07:03 -0600581 error = ilo_ccb_setup(hw, data, slot);
582 if (error) {
David Altobelli89bcb052008-07-02 09:38:53 -0600583 kfree(data);
David Altobelli66d5e512009-08-17 17:07:03 -0600584 goto out;
585 }
586
David Altobelli9f704842009-08-17 17:07:33 -0600587 data->ccb_cnt = 1;
588 data->ccb_excl = fp->f_flags & O_EXCL;
589 data->ilo_hw = hw;
590 init_waitqueue_head(&data->ccb_waitq);
591
David Altobelli66d5e512009-08-17 17:07:03 -0600592 /* write the ccb to hw */
David Altobelli9f704842009-08-17 17:07:33 -0600593 spin_lock_irqsave(&hw->alloc_lock, flags);
David Altobelli66d5e512009-08-17 17:07:03 -0600594 ilo_ccb_open(hw, data, slot);
David Altobelli9f704842009-08-17 17:07:33 -0600595 hw->ccb_alloc[slot] = data;
596 spin_unlock_irqrestore(&hw->alloc_lock, flags);
David Altobelli66d5e512009-08-17 17:07:03 -0600597
598 /* make sure the channel is functional */
599 error = ilo_ccb_verify(hw, data);
600 if (error) {
David Altobelli9f704842009-08-17 17:07:33 -0600601
602 spin_lock_irqsave(&hw->alloc_lock, flags);
603 hw->ccb_alloc[slot] = NULL;
604 spin_unlock_irqrestore(&hw->alloc_lock, flags);
605
David Altobelli66d5e512009-08-17 17:07:03 -0600606 ilo_ccb_close(hw->ilo_dev, data);
David Altobelli9f704842009-08-17 17:07:33 -0600607
David Altobelli66d5e512009-08-17 17:07:03 -0600608 kfree(data);
609 goto out;
610 }
611
David Altobelli89bcb052008-07-02 09:38:53 -0600612 } else {
613 kfree(data);
614 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
615 /*
616 * The channel exists, and either this open
617 * or a previous open of this channel wants
618 * exclusive access.
619 */
620 error = -EBUSY;
621 } else {
622 hw->ccb_alloc[slot]->ccb_cnt++;
623 error = 0;
624 }
625 }
David Altobelli66d5e512009-08-17 17:07:03 -0600626out:
David Altobelli9f704842009-08-17 17:07:33 -0600627 spin_unlock(&hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600628
629 if (!error)
630 fp->private_data = hw->ccb_alloc[slot];
631
632 return error;
633}
634
635static const struct file_operations ilo_fops = {
636 .owner = THIS_MODULE,
637 .read = ilo_read,
638 .write = ilo_write,
David Altobelli4a351472009-08-17 17:08:01 -0600639 .poll = ilo_poll,
David Altobelli89bcb052008-07-02 09:38:53 -0600640 .open = ilo_open,
641 .release = ilo_close,
642};
643
David Altobelli9f704842009-08-17 17:07:33 -0600644static irqreturn_t ilo_isr(int irq, void *data)
645{
646 struct ilo_hwinfo *hw = data;
647 int pending, i;
648
649 spin_lock(&hw->alloc_lock);
650
651 /* check for ccbs which have data */
652 pending = get_device_outbound(hw);
653 if (!pending) {
654 spin_unlock(&hw->alloc_lock);
655 return IRQ_NONE;
656 }
657
658 if (is_db_reset(pending)) {
659 /* wake up all ccbs if the device was reset */
660 pending = -1;
661 ilo_set_reset(hw);
662 }
663
664 for (i = 0; i < MAX_CCB; i++) {
665 if (!hw->ccb_alloc[i])
666 continue;
667 if (pending & (1 << i))
668 wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
669 }
670
671 /* clear the device of the channels that have been handled */
672 clear_pending_db(hw, pending);
673
674 spin_unlock(&hw->alloc_lock);
675
676 return IRQ_HANDLED;
677}
678
David Altobelli89bcb052008-07-02 09:38:53 -0600679static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
680{
681 pci_iounmap(pdev, hw->db_vaddr);
682 pci_iounmap(pdev, hw->ram_vaddr);
683 pci_iounmap(pdev, hw->mmio_vaddr);
684}
685
686static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
687{
688 int error = -ENOMEM;
689
690 /* map the memory mapped i/o registers */
691 hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
692 if (hw->mmio_vaddr == NULL) {
693 dev_err(&pdev->dev, "Error mapping mmio\n");
694 goto out;
695 }
696
697 /* map the adapter shared memory region */
698 hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ);
699 if (hw->ram_vaddr == NULL) {
700 dev_err(&pdev->dev, "Error mapping shared mem\n");
701 goto mmio_free;
702 }
703
704 /* map the doorbell aperture */
705 hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE);
706 if (hw->db_vaddr == NULL) {
707 dev_err(&pdev->dev, "Error mapping doorbell\n");
708 goto ram_free;
709 }
710
711 return 0;
712ram_free:
713 pci_iounmap(pdev, hw->ram_vaddr);
714mmio_free:
715 pci_iounmap(pdev, hw->mmio_vaddr);
716out:
717 return error;
718}
719
720static void ilo_remove(struct pci_dev *pdev)
721{
722 int i, minor;
723 struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
724
725 clear_device(ilo_hw);
726
727 minor = MINOR(ilo_hw->cdev.dev);
728 for (i = minor; i < minor + MAX_CCB; i++)
729 device_destroy(ilo_class, MKDEV(ilo_major, i));
730
731 cdev_del(&ilo_hw->cdev);
David Altobelli9f704842009-08-17 17:07:33 -0600732 ilo_disable_interrupts(ilo_hw);
733 free_irq(pdev->irq, ilo_hw);
David Altobelli89bcb052008-07-02 09:38:53 -0600734 ilo_unmap_device(pdev, ilo_hw);
735 pci_release_regions(pdev);
736 pci_disable_device(pdev);
737 kfree(ilo_hw);
738 ilo_hwdev[(minor / MAX_CCB)] = 0;
739}
740
741static int __devinit ilo_probe(struct pci_dev *pdev,
742 const struct pci_device_id *ent)
743{
744 int devnum, minor, start, error;
745 struct ilo_hwinfo *ilo_hw;
746
747 /* find a free range for device files */
748 for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
749 if (ilo_hwdev[devnum] == 0) {
750 ilo_hwdev[devnum] = 1;
751 break;
752 }
753 }
754
755 if (devnum == MAX_ILO_DEV) {
756 dev_err(&pdev->dev, "Error finding free device\n");
757 return -ENODEV;
758 }
759
760 /* track global allocations for this device */
761 error = -ENOMEM;
762 ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
763 if (!ilo_hw)
764 goto out;
765
766 ilo_hw->ilo_dev = pdev;
767 spin_lock_init(&ilo_hw->alloc_lock);
768 spin_lock_init(&ilo_hw->fifo_lock);
David Altobelli9f704842009-08-17 17:07:33 -0600769 spin_lock_init(&ilo_hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600770
771 error = pci_enable_device(pdev);
772 if (error)
773 goto free;
774
775 pci_set_master(pdev);
776
777 error = pci_request_regions(pdev, ILO_NAME);
778 if (error)
779 goto disable;
780
781 error = ilo_map_device(pdev, ilo_hw);
782 if (error)
783 goto free_regions;
784
785 pci_set_drvdata(pdev, ilo_hw);
786 clear_device(ilo_hw);
787
David Altobelli9f704842009-08-17 17:07:33 -0600788 error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
789 if (error)
790 goto unmap;
791
792 ilo_enable_interrupts(ilo_hw);
793
David Altobelli89bcb052008-07-02 09:38:53 -0600794 cdev_init(&ilo_hw->cdev, &ilo_fops);
795 ilo_hw->cdev.owner = THIS_MODULE;
796 start = devnum * MAX_CCB;
797 error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB);
798 if (error) {
799 dev_err(&pdev->dev, "Could not add cdev\n");
David Altobelli9f704842009-08-17 17:07:33 -0600800 goto remove_isr;
David Altobelli89bcb052008-07-02 09:38:53 -0600801 }
802
803 for (minor = 0 ; minor < MAX_CCB; minor++) {
804 struct device *dev;
805 dev = device_create(ilo_class, &pdev->dev,
806 MKDEV(ilo_major, minor), NULL,
807 "hpilo!d%dccb%d", devnum, minor);
808 if (IS_ERR(dev))
809 dev_err(&pdev->dev, "Could not create files\n");
810 }
811
812 return 0;
David Altobelli9f704842009-08-17 17:07:33 -0600813remove_isr:
814 ilo_disable_interrupts(ilo_hw);
815 free_irq(pdev->irq, ilo_hw);
David Altobelli89bcb052008-07-02 09:38:53 -0600816unmap:
817 ilo_unmap_device(pdev, ilo_hw);
818free_regions:
819 pci_release_regions(pdev);
820disable:
821 pci_disable_device(pdev);
822free:
823 kfree(ilo_hw);
824out:
825 ilo_hwdev[devnum] = 0;
826 return error;
827}
828
829static struct pci_device_id ilo_devices[] = {
830 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
David Altobelli31d8b562009-02-27 14:03:09 -0800831 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
David Altobelli89bcb052008-07-02 09:38:53 -0600832 { }
833};
834MODULE_DEVICE_TABLE(pci, ilo_devices);
835
836static struct pci_driver ilo_driver = {
837 .name = ILO_NAME,
838 .id_table = ilo_devices,
839 .probe = ilo_probe,
840 .remove = __devexit_p(ilo_remove),
841};
842
843static int __init ilo_init(void)
844{
845 int error;
846 dev_t dev;
847
848 ilo_class = class_create(THIS_MODULE, "iLO");
849 if (IS_ERR(ilo_class)) {
850 error = PTR_ERR(ilo_class);
851 goto out;
852 }
853
854 error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
855 if (error)
856 goto class_destroy;
857
858 ilo_major = MAJOR(dev);
859
860 error = pci_register_driver(&ilo_driver);
861 if (error)
862 goto chr_remove;
863
864 return 0;
865chr_remove:
866 unregister_chrdev_region(dev, MAX_OPEN);
867class_destroy:
868 class_destroy(ilo_class);
869out:
870 return error;
871}
872
873static void __exit ilo_exit(void)
874{
875 pci_unregister_driver(&ilo_driver);
876 unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
877 class_destroy(ilo_class);
878}
879
David Altobelli4a351472009-08-17 17:08:01 -0600880MODULE_VERSION("1.2");
David Altobelli89bcb052008-07-02 09:38:53 -0600881MODULE_ALIAS(ILO_NAME);
882MODULE_DESCRIPTION(ILO_NAME);
883MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");
884MODULE_LICENSE("GPL v2");
885
886module_init(ilo_init);
887module_exit(ilo_exit);