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David Altobelli89bcb052008-07-02 09:38:53 -06001/*
dann frazier1ce873a2010-10-15 10:14:34 -06002 * Driver for the HP iLO management processor.
David Altobelli89bcb052008-07-02 09:38:53 -06003 *
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;
Mark Ruskebf1b762012-11-06 14:33:13 -060033static unsigned int max_ccb = 16;
David Altobelli89bcb052008-07-02 09:38:53 -060034static char ilo_hwdev[MAX_ILO_DEV];
35
36static inline int get_entry_id(int entry)
37{
38 return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR;
39}
40
41static inline int get_entry_len(int entry)
42{
43 return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3;
44}
45
46static inline int mk_entry(int id, int len)
47{
48 int qlen = len & 7 ? (len >> 3) + 1 : len >> 3;
49 return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS;
50}
51
52static inline int desc_mem_sz(int nr_entry)
53{
54 return nr_entry << L2_QENTRY_SZ;
55}
56
57/*
58 * FIFO queues, shared with hardware.
59 *
60 * If a queue has empty slots, an entry is added to the queue tail,
61 * and that entry is marked as occupied.
62 * Entries can be dequeued from the head of the list, when the device
63 * has marked the entry as consumed.
64 *
65 * Returns true on successful queue/dequeue, false on failure.
66 */
67static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
68{
69 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
David Altobelli9f704842009-08-17 17:07:33 -060070 unsigned long flags;
David Altobelli89bcb052008-07-02 09:38:53 -060071 int ret = 0;
72
David Altobelli9f704842009-08-17 17:07:33 -060073 spin_lock_irqsave(&hw->fifo_lock, flags);
David Altobelli89bcb052008-07-02 09:38:53 -060074 if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
75 & ENTRY_MASK_O)) {
76 fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
77 (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
78 fifo_q->tail += 1;
79 ret = 1;
80 }
David Altobelli9f704842009-08-17 17:07:33 -060081 spin_unlock_irqrestore(&hw->fifo_lock, flags);
David Altobelli89bcb052008-07-02 09:38:53 -060082
83 return ret;
84}
85
86static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
87{
88 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
David Altobelli9f704842009-08-17 17:07:33 -060089 unsigned long flags;
David Altobelli89bcb052008-07-02 09:38:53 -060090 int ret = 0;
91 u64 c;
92
David Altobelli9f704842009-08-17 17:07:33 -060093 spin_lock_irqsave(&hw->fifo_lock, flags);
David Altobelli89bcb052008-07-02 09:38:53 -060094 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
95 if (c & ENTRY_MASK_C) {
96 if (entry)
97 *entry = c & ENTRY_MASK_NOSTATE;
98
99 fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
100 (c | ENTRY_MASK) + 1;
101 fifo_q->head += 1;
102 ret = 1;
103 }
David Altobelli9f704842009-08-17 17:07:33 -0600104 spin_unlock_irqrestore(&hw->fifo_lock, flags);
David Altobelli89bcb052008-07-02 09:38:53 -0600105
106 return ret;
107}
108
David Altobelli4a351472009-08-17 17:08:01 -0600109static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
110{
111 struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
112 unsigned long flags;
113 int ret = 0;
114 u64 c;
115
116 spin_lock_irqsave(&hw->fifo_lock, flags);
117 c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
118 if (c & ENTRY_MASK_C)
119 ret = 1;
120 spin_unlock_irqrestore(&hw->fifo_lock, flags);
121
122 return ret;
123}
124
David Altobelli89bcb052008-07-02 09:38:53 -0600125static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
126 int dir, int id, int len)
127{
128 char *fifobar;
129 int entry;
130
131 if (dir == SENDQ)
132 fifobar = ccb->ccb_u1.send_fifobar;
133 else
134 fifobar = ccb->ccb_u3.recv_fifobar;
135
136 entry = mk_entry(id, len);
137 return fifo_enqueue(hw, fifobar, entry);
138}
139
140static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
141 int dir, int *id, int *len, void **pkt)
142{
143 char *fifobar, *desc;
144 int entry = 0, pkt_id = 0;
145 int ret;
146
147 if (dir == SENDQ) {
148 fifobar = ccb->ccb_u1.send_fifobar;
149 desc = ccb->ccb_u2.send_desc;
150 } else {
151 fifobar = ccb->ccb_u3.recv_fifobar;
152 desc = ccb->ccb_u4.recv_desc;
153 }
154
155 ret = fifo_dequeue(hw, fifobar, &entry);
156 if (ret) {
157 pkt_id = get_entry_id(entry);
158 if (id)
159 *id = pkt_id;
160 if (len)
161 *len = get_entry_len(entry);
162 if (pkt)
163 *pkt = (void *)(desc + desc_mem_sz(pkt_id));
164 }
165
166 return ret;
167}
168
David Altobelli4a351472009-08-17 17:08:01 -0600169static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
170{
171 char *fifobar = ccb->ccb_u3.recv_fifobar;
172
173 return fifo_check_recv(hw, fifobar);
174}
175
David Altobelli89bcb052008-07-02 09:38:53 -0600176static inline void doorbell_set(struct ccb *ccb)
177{
178 iowrite8(1, ccb->ccb_u5.db_base);
179}
180
181static inline void doorbell_clr(struct ccb *ccb)
182{
183 iowrite8(2, ccb->ccb_u5.db_base);
184}
David Altobelli66d5e512009-08-17 17:07:03 -0600185
David Altobelli89bcb052008-07-02 09:38:53 -0600186static inline int ctrl_set(int l2sz, int idxmask, int desclim)
187{
188 int active = 0, go = 1;
189 return l2sz << CTRL_BITPOS_L2SZ |
190 idxmask << CTRL_BITPOS_FIFOINDEXMASK |
191 desclim << CTRL_BITPOS_DESCLIMIT |
192 active << CTRL_BITPOS_A |
193 go << CTRL_BITPOS_G;
194}
David Altobelli66d5e512009-08-17 17:07:03 -0600195
David Altobelli89bcb052008-07-02 09:38:53 -0600196static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
197{
198 /* for simplicity, use the same parameters for send and recv ctrls */
199 ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
200 ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1);
201}
202
203static inline int fifo_sz(int nr_entry)
204{
205 /* size of a fifo is determined by the number of entries it contains */
206 return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE;
207}
208
209static void fifo_setup(void *base_addr, int nr_entry)
210{
211 struct fifo *fifo_q = base_addr;
212 int i;
213
214 /* set up an empty fifo */
215 fifo_q->head = 0;
216 fifo_q->tail = 0;
217 fifo_q->reset = 0;
218 fifo_q->nrents = nr_entry;
219 fifo_q->imask = nr_entry - 1;
220 fifo_q->merge = ENTRY_MASK_O;
221
222 for (i = 0; i < nr_entry; i++)
223 fifo_q->fifobar[i] = 0;
224}
225
226static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
227{
David Altobelli66d5e512009-08-17 17:07:03 -0600228 struct ccb *driver_ccb = &data->driver_ccb;
229 struct ccb __iomem *device_ccb = data->mapped_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600230 int retries;
231
David Altobelli89bcb052008-07-02 09:38:53 -0600232 /* complicated dance to tell the hw we are stopping */
233 doorbell_clr(driver_ccb);
234 iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
235 &device_ccb->send_ctrl);
236 iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
237 &device_ccb->recv_ctrl);
238
239 /* give iLO some time to process stop request */
David Altobellic073b2d2009-02-04 15:11:58 -0800240 for (retries = MAX_WAIT; retries > 0; retries--) {
David Altobelli89bcb052008-07-02 09:38:53 -0600241 doorbell_set(driver_ccb);
David Altobelli891f7d72009-03-31 15:23:53 -0700242 udelay(WAIT_TIME);
David Altobelli89bcb052008-07-02 09:38:53 -0600243 if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
244 &&
245 !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
246 break;
247 }
248 if (retries == 0)
249 dev_err(&pdev->dev, "Closing, but controller still active\n");
250
251 /* clear the hw ccb */
252 memset_io(device_ccb, 0, sizeof(struct ccb));
253
254 /* free resources used to back send/recv queues */
255 pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
256}
257
David Altobelli66d5e512009-08-17 17:07:03 -0600258static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
David Altobelli89bcb052008-07-02 09:38:53 -0600259{
Prarit Bhargavacdf8afc2010-08-09 17:20:27 -0700260 char *dma_va;
261 dma_addr_t dma_pa;
David Altobelli89bcb052008-07-02 09:38:53 -0600262 struct ccb *driver_ccb, *ilo_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600263
264 driver_ccb = &data->driver_ccb;
265 ilo_ccb = &data->ilo_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600266
267 data->dma_size = 2 * fifo_sz(NR_QENTRY) +
268 2 * desc_mem_sz(NR_QENTRY) +
269 ILO_START_ALIGN + ILO_CACHE_SZ;
270
David Altobelli66d5e512009-08-17 17:07:03 -0600271 data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size,
David Altobelli89bcb052008-07-02 09:38:53 -0600272 &data->dma_pa);
273 if (!data->dma_va)
David Altobelli66d5e512009-08-17 17:07:03 -0600274 return -ENOMEM;
David Altobelli89bcb052008-07-02 09:38:53 -0600275
276 dma_va = (char *)data->dma_va;
Prarit Bhargavacdf8afc2010-08-09 17:20:27 -0700277 dma_pa = data->dma_pa;
David Altobelli89bcb052008-07-02 09:38:53 -0600278
279 memset(dma_va, 0, data->dma_size);
280
281 dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
Prarit Bhargavacdf8afc2010-08-09 17:20:27 -0700282 dma_pa = roundup(dma_pa, ILO_START_ALIGN);
David Altobelli89bcb052008-07-02 09:38:53 -0600283
284 /*
285 * Create two ccb's, one with virt addrs, one with phys addrs.
286 * Copy the phys addr ccb to device shared mem.
287 */
288 ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
289 ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
290
291 fifo_setup(dma_va, NR_QENTRY);
292 driver_ccb->ccb_u1.send_fifobar = dma_va + FIFOHANDLESIZE;
Prarit Bhargavacdf8afc2010-08-09 17:20:27 -0700293 ilo_ccb->ccb_u1.send_fifobar_pa = dma_pa + FIFOHANDLESIZE;
David Altobelli89bcb052008-07-02 09:38:53 -0600294 dma_va += fifo_sz(NR_QENTRY);
295 dma_pa += fifo_sz(NR_QENTRY);
296
297 dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
Prarit Bhargavacdf8afc2010-08-09 17:20:27 -0700298 dma_pa = roundup(dma_pa, ILO_CACHE_SZ);
David Altobelli89bcb052008-07-02 09:38:53 -0600299
300 fifo_setup(dma_va, NR_QENTRY);
301 driver_ccb->ccb_u3.recv_fifobar = dma_va + FIFOHANDLESIZE;
Prarit Bhargavacdf8afc2010-08-09 17:20:27 -0700302 ilo_ccb->ccb_u3.recv_fifobar_pa = dma_pa + FIFOHANDLESIZE;
David Altobelli89bcb052008-07-02 09:38:53 -0600303 dma_va += fifo_sz(NR_QENTRY);
304 dma_pa += fifo_sz(NR_QENTRY);
305
306 driver_ccb->ccb_u2.send_desc = dma_va;
Prarit Bhargavacdf8afc2010-08-09 17:20:27 -0700307 ilo_ccb->ccb_u2.send_desc_pa = dma_pa;
David Altobelli89bcb052008-07-02 09:38:53 -0600308 dma_pa += desc_mem_sz(NR_QENTRY);
309 dma_va += desc_mem_sz(NR_QENTRY);
310
311 driver_ccb->ccb_u4.recv_desc = dma_va;
Prarit Bhargavacdf8afc2010-08-09 17:20:27 -0700312 ilo_ccb->ccb_u4.recv_desc_pa = dma_pa;
David Altobelli89bcb052008-07-02 09:38:53 -0600313
314 driver_ccb->channel = slot;
315 ilo_ccb->channel = slot;
316
317 driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
318 ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
319
David Altobelli66d5e512009-08-17 17:07:03 -0600320 return 0;
321}
322
323static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
324{
325 int pkt_id, pkt_sz;
326 struct ccb *driver_ccb = &data->driver_ccb;
327
David Altobelli89bcb052008-07-02 09:38:53 -0600328 /* copy the ccb with physical addrs to device memory */
329 data->mapped_ccb = (struct ccb __iomem *)
330 (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
David Altobelli66d5e512009-08-17 17:07:03 -0600331 memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
David Altobelli89bcb052008-07-02 09:38:53 -0600332
333 /* put packets on the send and receive queues */
334 pkt_sz = 0;
335 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
336 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
337 doorbell_set(driver_ccb);
338 }
339
340 pkt_sz = desc_mem_sz(1);
341 for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
342 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
343
David Altobelli66d5e512009-08-17 17:07:03 -0600344 /* the ccb is ready to use */
David Altobelli89bcb052008-07-02 09:38:53 -0600345 doorbell_clr(driver_ccb);
David Altobelli66d5e512009-08-17 17:07:03 -0600346}
347
348static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
349{
350 int pkt_id, i;
351 struct ccb *driver_ccb = &data->driver_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600352
353 /* make sure iLO is really handling requests */
David Altobellic073b2d2009-02-04 15:11:58 -0800354 for (i = MAX_WAIT; i > 0; i--) {
David Altobelli89bcb052008-07-02 09:38:53 -0600355 if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
356 break;
David Altobelli891f7d72009-03-31 15:23:53 -0700357 udelay(WAIT_TIME);
David Altobelli89bcb052008-07-02 09:38:53 -0600358 }
359
David Altobelli66d5e512009-08-17 17:07:03 -0600360 if (i == 0) {
361 dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
362 return -EBUSY;
David Altobelli89bcb052008-07-02 09:38:53 -0600363 }
364
David Altobelli66d5e512009-08-17 17:07:03 -0600365 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
366 doorbell_set(driver_ccb);
David Altobelli89bcb052008-07-02 09:38:53 -0600367 return 0;
David Altobelli89bcb052008-07-02 09:38:53 -0600368}
369
370static inline int is_channel_reset(struct ccb *ccb)
371{
372 /* check for this particular channel needing a reset */
373 return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
374}
375
376static inline void set_channel_reset(struct ccb *ccb)
377{
378 /* set a flag indicating this channel needs a reset */
379 FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
380}
381
David Altobelli66d5e512009-08-17 17:07:03 -0600382static inline int get_device_outbound(struct ilo_hwinfo *hw)
383{
384 return ioread32(&hw->mmio_vaddr[DB_OUT]);
385}
386
387static inline int is_db_reset(int db_out)
388{
389 return db_out & (1 << DB_RESET);
390}
391
David Altobelli89bcb052008-07-02 09:38:53 -0600392static inline int is_device_reset(struct ilo_hwinfo *hw)
393{
394 /* check for global reset condition */
David Altobelli66d5e512009-08-17 17:07:03 -0600395 return is_db_reset(get_device_outbound(hw));
396}
397
398static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
399{
400 iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
David Altobelli89bcb052008-07-02 09:38:53 -0600401}
402
403static inline void clear_device(struct ilo_hwinfo *hw)
404{
405 /* clear the device (reset bits, pending channel entries) */
David Altobelli66d5e512009-08-17 17:07:03 -0600406 clear_pending_db(hw, -1);
David Altobelli89bcb052008-07-02 09:38:53 -0600407}
408
David Altobelli9f704842009-08-17 17:07:33 -0600409static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
410{
411 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
412}
413
414static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
415{
416 iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
417 &hw->mmio_vaddr[DB_IRQ]);
418}
419
420static void ilo_set_reset(struct ilo_hwinfo *hw)
David Altobelli89bcb052008-07-02 09:38:53 -0600421{
422 int slot;
423
424 /*
425 * Mapped memory is zeroed on ilo reset, so set a per ccb flag
426 * to indicate that this ccb needs to be closed and reopened.
427 */
Camuso, Tony98dcd592012-06-10 14:39:20 +0100428 for (slot = 0; slot < max_ccb; slot++) {
David Altobelli89bcb052008-07-02 09:38:53 -0600429 if (!hw->ccb_alloc[slot])
430 continue;
431 set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
432 }
David Altobelli89bcb052008-07-02 09:38:53 -0600433}
434
435static ssize_t ilo_read(struct file *fp, char __user *buf,
436 size_t len, loff_t *off)
437{
438 int err, found, cnt, pkt_id, pkt_len;
David Altobelli66d5e512009-08-17 17:07:03 -0600439 struct ccb_data *data = fp->private_data;
440 struct ccb *driver_ccb = &data->driver_ccb;
441 struct ilo_hwinfo *hw = data->ilo_hw;
David Altobelli89bcb052008-07-02 09:38:53 -0600442 void *pkt;
443
David Altobelli9f704842009-08-17 17:07:33 -0600444 if (is_channel_reset(driver_ccb)) {
David Altobelli89bcb052008-07-02 09:38:53 -0600445 /*
446 * If the device has been reset, applications
447 * need to close and reopen all ccbs.
448 */
David Altobelli89bcb052008-07-02 09:38:53 -0600449 return -ENODEV;
450 }
451
452 /*
453 * This function is to be called when data is expected
454 * in the channel, and will return an error if no packet is found
455 * during the loop below. The sleep/retry logic is to allow
456 * applications to call read() immediately post write(),
457 * and give iLO some time to process the sent packet.
458 */
459 cnt = 20;
460 do {
461 /* look for a received packet */
462 found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
463 &pkt_len, &pkt);
464 if (found)
465 break;
466 cnt--;
467 msleep(100);
468 } while (!found && cnt);
469
470 if (!found)
471 return -EAGAIN;
472
473 /* only copy the length of the received packet */
474 if (pkt_len < len)
475 len = pkt_len;
476
477 err = copy_to_user(buf, pkt, len);
478
479 /* return the received packet to the queue */
480 ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
481
482 return err ? -EFAULT : len;
483}
484
485static ssize_t ilo_write(struct file *fp, const char __user *buf,
486 size_t len, loff_t *off)
487{
488 int err, pkt_id, pkt_len;
David Altobelli66d5e512009-08-17 17:07:03 -0600489 struct ccb_data *data = fp->private_data;
490 struct ccb *driver_ccb = &data->driver_ccb;
491 struct ilo_hwinfo *hw = data->ilo_hw;
David Altobelli89bcb052008-07-02 09:38:53 -0600492 void *pkt;
493
David Altobelli9f704842009-08-17 17:07:33 -0600494 if (is_channel_reset(driver_ccb))
David Altobelli89bcb052008-07-02 09:38:53 -0600495 return -ENODEV;
David Altobelli89bcb052008-07-02 09:38:53 -0600496
497 /* get a packet to send the user command */
498 if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
499 return -EBUSY;
500
501 /* limit the length to the length of the packet */
502 if (pkt_len < len)
503 len = pkt_len;
504
505 /* on failure, set the len to 0 to return empty packet to the device */
506 err = copy_from_user(pkt, buf, len);
507 if (err)
508 len = 0;
509
510 /* send the packet */
511 ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
512 doorbell_set(driver_ccb);
513
514 return err ? -EFAULT : len;
515}
516
David Altobelli4a351472009-08-17 17:08:01 -0600517static unsigned int ilo_poll(struct file *fp, poll_table *wait)
518{
519 struct ccb_data *data = fp->private_data;
520 struct ccb *driver_ccb = &data->driver_ccb;
521
522 poll_wait(fp, &data->ccb_waitq, wait);
523
524 if (is_channel_reset(driver_ccb))
525 return POLLERR;
526 else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
527 return POLLIN | POLLRDNORM;
528
529 return 0;
530}
531
David Altobelli89bcb052008-07-02 09:38:53 -0600532static int ilo_close(struct inode *ip, struct file *fp)
533{
534 int slot;
535 struct ccb_data *data;
536 struct ilo_hwinfo *hw;
David Altobelli9f704842009-08-17 17:07:33 -0600537 unsigned long flags;
David Altobelli89bcb052008-07-02 09:38:53 -0600538
Camuso, Tony98dcd592012-06-10 14:39:20 +0100539 slot = iminor(ip) % max_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600540 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
541
David Altobelli9f704842009-08-17 17:07:33 -0600542 spin_lock(&hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600543
544 if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
545
546 data = fp->private_data;
547
David Altobelli9f704842009-08-17 17:07:33 -0600548 spin_lock_irqsave(&hw->alloc_lock, flags);
549 hw->ccb_alloc[slot] = NULL;
550 spin_unlock_irqrestore(&hw->alloc_lock, flags);
551
David Altobelli89bcb052008-07-02 09:38:53 -0600552 ilo_ccb_close(hw->ilo_dev, data);
553
554 kfree(data);
David Altobelli89bcb052008-07-02 09:38:53 -0600555 } else
556 hw->ccb_alloc[slot]->ccb_cnt--;
557
David Altobelli9f704842009-08-17 17:07:33 -0600558 spin_unlock(&hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600559
560 return 0;
561}
562
563static int ilo_open(struct inode *ip, struct file *fp)
564{
565 int slot, error;
566 struct ccb_data *data;
567 struct ilo_hwinfo *hw;
David Altobelli9f704842009-08-17 17:07:33 -0600568 unsigned long flags;
David Altobelli89bcb052008-07-02 09:38:53 -0600569
Camuso, Tony98dcd592012-06-10 14:39:20 +0100570 slot = iminor(ip) % max_ccb;
David Altobelli89bcb052008-07-02 09:38:53 -0600571 hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
572
573 /* new ccb allocation */
574 data = kzalloc(sizeof(*data), GFP_KERNEL);
575 if (!data)
576 return -ENOMEM;
577
David Altobelli9f704842009-08-17 17:07:33 -0600578 spin_lock(&hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600579
580 /* each fd private_data holds sw/hw view of ccb */
581 if (hw->ccb_alloc[slot] == NULL) {
582 /* create a channel control block for this minor */
David Altobelli66d5e512009-08-17 17:07:03 -0600583 error = ilo_ccb_setup(hw, data, slot);
584 if (error) {
David Altobelli89bcb052008-07-02 09:38:53 -0600585 kfree(data);
David Altobelli66d5e512009-08-17 17:07:03 -0600586 goto out;
587 }
588
David Altobelli9f704842009-08-17 17:07:33 -0600589 data->ccb_cnt = 1;
590 data->ccb_excl = fp->f_flags & O_EXCL;
591 data->ilo_hw = hw;
592 init_waitqueue_head(&data->ccb_waitq);
593
David Altobelli66d5e512009-08-17 17:07:03 -0600594 /* write the ccb to hw */
David Altobelli9f704842009-08-17 17:07:33 -0600595 spin_lock_irqsave(&hw->alloc_lock, flags);
David Altobelli66d5e512009-08-17 17:07:03 -0600596 ilo_ccb_open(hw, data, slot);
David Altobelli9f704842009-08-17 17:07:33 -0600597 hw->ccb_alloc[slot] = data;
598 spin_unlock_irqrestore(&hw->alloc_lock, flags);
David Altobelli66d5e512009-08-17 17:07:03 -0600599
600 /* make sure the channel is functional */
601 error = ilo_ccb_verify(hw, data);
602 if (error) {
David Altobelli9f704842009-08-17 17:07:33 -0600603
604 spin_lock_irqsave(&hw->alloc_lock, flags);
605 hw->ccb_alloc[slot] = NULL;
606 spin_unlock_irqrestore(&hw->alloc_lock, flags);
607
David Altobelli66d5e512009-08-17 17:07:03 -0600608 ilo_ccb_close(hw->ilo_dev, data);
David Altobelli9f704842009-08-17 17:07:33 -0600609
David Altobelli66d5e512009-08-17 17:07:03 -0600610 kfree(data);
611 goto out;
612 }
613
David Altobelli89bcb052008-07-02 09:38:53 -0600614 } else {
615 kfree(data);
616 if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
617 /*
618 * The channel exists, and either this open
619 * or a previous open of this channel wants
620 * exclusive access.
621 */
622 error = -EBUSY;
623 } else {
624 hw->ccb_alloc[slot]->ccb_cnt++;
625 error = 0;
626 }
627 }
David Altobelli66d5e512009-08-17 17:07:03 -0600628out:
David Altobelli9f704842009-08-17 17:07:33 -0600629 spin_unlock(&hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600630
631 if (!error)
632 fp->private_data = hw->ccb_alloc[slot];
633
634 return error;
635}
636
637static const struct file_operations ilo_fops = {
638 .owner = THIS_MODULE,
639 .read = ilo_read,
640 .write = ilo_write,
David Altobelli4a351472009-08-17 17:08:01 -0600641 .poll = ilo_poll,
David Altobelli89bcb052008-07-02 09:38:53 -0600642 .open = ilo_open,
643 .release = ilo_close,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200644 .llseek = noop_llseek,
David Altobelli89bcb052008-07-02 09:38:53 -0600645};
646
David Altobelli9f704842009-08-17 17:07:33 -0600647static irqreturn_t ilo_isr(int irq, void *data)
648{
649 struct ilo_hwinfo *hw = data;
650 int pending, i;
651
652 spin_lock(&hw->alloc_lock);
653
654 /* check for ccbs which have data */
655 pending = get_device_outbound(hw);
656 if (!pending) {
657 spin_unlock(&hw->alloc_lock);
658 return IRQ_NONE;
659 }
660
661 if (is_db_reset(pending)) {
662 /* wake up all ccbs if the device was reset */
663 pending = -1;
664 ilo_set_reset(hw);
665 }
666
Camuso, Tony98dcd592012-06-10 14:39:20 +0100667 for (i = 0; i < max_ccb; i++) {
David Altobelli9f704842009-08-17 17:07:33 -0600668 if (!hw->ccb_alloc[i])
669 continue;
670 if (pending & (1 << i))
671 wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
672 }
673
674 /* clear the device of the channels that have been handled */
675 clear_pending_db(hw, pending);
676
677 spin_unlock(&hw->alloc_lock);
678
679 return IRQ_HANDLED;
680}
681
David Altobelli89bcb052008-07-02 09:38:53 -0600682static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
683{
684 pci_iounmap(pdev, hw->db_vaddr);
685 pci_iounmap(pdev, hw->ram_vaddr);
686 pci_iounmap(pdev, hw->mmio_vaddr);
687}
688
Bill Pemberton80c8ae22012-11-19 13:23:05 -0500689static int ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
David Altobelli89bcb052008-07-02 09:38:53 -0600690{
691 int error = -ENOMEM;
692
693 /* map the memory mapped i/o registers */
694 hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
695 if (hw->mmio_vaddr == NULL) {
696 dev_err(&pdev->dev, "Error mapping mmio\n");
697 goto out;
698 }
699
700 /* map the adapter shared memory region */
Camuso, Tony98dcd592012-06-10 14:39:20 +0100701 hw->ram_vaddr = pci_iomap(pdev, 2, max_ccb * ILOHW_CCB_SZ);
David Altobelli89bcb052008-07-02 09:38:53 -0600702 if (hw->ram_vaddr == NULL) {
703 dev_err(&pdev->dev, "Error mapping shared mem\n");
704 goto mmio_free;
705 }
706
707 /* map the doorbell aperture */
Camuso, Tony98dcd592012-06-10 14:39:20 +0100708 hw->db_vaddr = pci_iomap(pdev, 3, max_ccb * ONE_DB_SIZE);
David Altobelli89bcb052008-07-02 09:38:53 -0600709 if (hw->db_vaddr == NULL) {
710 dev_err(&pdev->dev, "Error mapping doorbell\n");
711 goto ram_free;
712 }
713
714 return 0;
715ram_free:
716 pci_iounmap(pdev, hw->ram_vaddr);
717mmio_free:
718 pci_iounmap(pdev, hw->mmio_vaddr);
719out:
720 return error;
721}
722
723static void ilo_remove(struct pci_dev *pdev)
724{
725 int i, minor;
726 struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
727
Mark Ruskebf1b762012-11-06 14:33:13 -0600728 if (!ilo_hw)
729 return;
730
David Altobelli89bcb052008-07-02 09:38:53 -0600731 clear_device(ilo_hw);
732
733 minor = MINOR(ilo_hw->cdev.dev);
Camuso, Tony98dcd592012-06-10 14:39:20 +0100734 for (i = minor; i < minor + max_ccb; i++)
David Altobelli89bcb052008-07-02 09:38:53 -0600735 device_destroy(ilo_class, MKDEV(ilo_major, i));
736
737 cdev_del(&ilo_hw->cdev);
David Altobelli9f704842009-08-17 17:07:33 -0600738 ilo_disable_interrupts(ilo_hw);
739 free_irq(pdev->irq, ilo_hw);
David Altobelli89bcb052008-07-02 09:38:53 -0600740 ilo_unmap_device(pdev, ilo_hw);
741 pci_release_regions(pdev);
Jiri Slabybcdee042012-09-13 16:06:48 +0200742 /*
743 * pci_disable_device(pdev) used to be here. But this PCI device has
744 * two functions with interrupt lines connected to a single pin. The
745 * other one is a USB host controller. So when we disable the PIN here
746 * e.g. by rmmod hpilo, the controller stops working. It is because
747 * the interrupt link is disabled in ACPI since it is not refcounted
748 * yet. See acpi_pci_link_free_irq called from acpi_pci_irq_disable.
749 */
David Altobelli89bcb052008-07-02 09:38:53 -0600750 kfree(ilo_hw);
Camuso, Tony98dcd592012-06-10 14:39:20 +0100751 ilo_hwdev[(minor / max_ccb)] = 0;
David Altobelli89bcb052008-07-02 09:38:53 -0600752}
753
Bill Pemberton80c8ae22012-11-19 13:23:05 -0500754static int ilo_probe(struct pci_dev *pdev,
David Altobelli89bcb052008-07-02 09:38:53 -0600755 const struct pci_device_id *ent)
756{
Mark Ruskebf1b762012-11-06 14:33:13 -0600757 int devnum, minor, start, error = 0;
David Altobelli89bcb052008-07-02 09:38:53 -0600758 struct ilo_hwinfo *ilo_hw;
759
Mark Ruskebf1b762012-11-06 14:33:13 -0600760 /* Ignore subsystem_device = 0x1979 (set by BIOS) */
761 if (pdev->subsystem_device == 0x1979)
762 goto out;
763
Camuso, Tony98dcd592012-06-10 14:39:20 +0100764 if (max_ccb > MAX_CCB)
765 max_ccb = MAX_CCB;
766 else if (max_ccb < MIN_CCB)
767 max_ccb = MIN_CCB;
768
David Altobelli89bcb052008-07-02 09:38:53 -0600769 /* find a free range for device files */
770 for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
771 if (ilo_hwdev[devnum] == 0) {
772 ilo_hwdev[devnum] = 1;
773 break;
774 }
775 }
776
777 if (devnum == MAX_ILO_DEV) {
778 dev_err(&pdev->dev, "Error finding free device\n");
779 return -ENODEV;
780 }
781
782 /* track global allocations for this device */
783 error = -ENOMEM;
784 ilo_hw = kzalloc(sizeof(*ilo_hw), GFP_KERNEL);
785 if (!ilo_hw)
786 goto out;
787
788 ilo_hw->ilo_dev = pdev;
789 spin_lock_init(&ilo_hw->alloc_lock);
790 spin_lock_init(&ilo_hw->fifo_lock);
David Altobelli9f704842009-08-17 17:07:33 -0600791 spin_lock_init(&ilo_hw->open_lock);
David Altobelli89bcb052008-07-02 09:38:53 -0600792
793 error = pci_enable_device(pdev);
794 if (error)
795 goto free;
796
797 pci_set_master(pdev);
798
799 error = pci_request_regions(pdev, ILO_NAME);
800 if (error)
801 goto disable;
802
803 error = ilo_map_device(pdev, ilo_hw);
804 if (error)
805 goto free_regions;
806
807 pci_set_drvdata(pdev, ilo_hw);
808 clear_device(ilo_hw);
809
David Altobelli9f704842009-08-17 17:07:33 -0600810 error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
811 if (error)
812 goto unmap;
813
814 ilo_enable_interrupts(ilo_hw);
815
David Altobelli89bcb052008-07-02 09:38:53 -0600816 cdev_init(&ilo_hw->cdev, &ilo_fops);
817 ilo_hw->cdev.owner = THIS_MODULE;
Camuso, Tony98dcd592012-06-10 14:39:20 +0100818 start = devnum * max_ccb;
819 error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), max_ccb);
David Altobelli89bcb052008-07-02 09:38:53 -0600820 if (error) {
821 dev_err(&pdev->dev, "Could not add cdev\n");
David Altobelli9f704842009-08-17 17:07:33 -0600822 goto remove_isr;
David Altobelli89bcb052008-07-02 09:38:53 -0600823 }
824
Camuso, Tony98dcd592012-06-10 14:39:20 +0100825 for (minor = 0 ; minor < max_ccb; minor++) {
David Altobelli89bcb052008-07-02 09:38:53 -0600826 struct device *dev;
827 dev = device_create(ilo_class, &pdev->dev,
828 MKDEV(ilo_major, minor), NULL,
829 "hpilo!d%dccb%d", devnum, minor);
830 if (IS_ERR(dev))
831 dev_err(&pdev->dev, "Could not create files\n");
832 }
833
834 return 0;
David Altobelli9f704842009-08-17 17:07:33 -0600835remove_isr:
836 ilo_disable_interrupts(ilo_hw);
837 free_irq(pdev->irq, ilo_hw);
David Altobelli89bcb052008-07-02 09:38:53 -0600838unmap:
839 ilo_unmap_device(pdev, ilo_hw);
840free_regions:
841 pci_release_regions(pdev);
842disable:
Jiri Slabybcdee042012-09-13 16:06:48 +0200843/* pci_disable_device(pdev); see comment in ilo_remove */
David Altobelli89bcb052008-07-02 09:38:53 -0600844free:
845 kfree(ilo_hw);
846out:
847 ilo_hwdev[devnum] = 0;
848 return error;
849}
850
851static struct pci_device_id ilo_devices[] = {
852 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
David Altobelli31d8b562009-02-27 14:03:09 -0800853 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3307) },
David Altobelli89bcb052008-07-02 09:38:53 -0600854 { }
855};
856MODULE_DEVICE_TABLE(pci, ilo_devices);
857
858static struct pci_driver ilo_driver = {
859 .name = ILO_NAME,
860 .id_table = ilo_devices,
861 .probe = ilo_probe,
Bill Pemberton2d6bed92012-11-19 13:21:23 -0500862 .remove = ilo_remove,
David Altobelli89bcb052008-07-02 09:38:53 -0600863};
864
865static int __init ilo_init(void)
866{
867 int error;
868 dev_t dev;
869
870 ilo_class = class_create(THIS_MODULE, "iLO");
871 if (IS_ERR(ilo_class)) {
872 error = PTR_ERR(ilo_class);
873 goto out;
874 }
875
876 error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
877 if (error)
878 goto class_destroy;
879
880 ilo_major = MAJOR(dev);
881
882 error = pci_register_driver(&ilo_driver);
883 if (error)
884 goto chr_remove;
885
886 return 0;
887chr_remove:
888 unregister_chrdev_region(dev, MAX_OPEN);
889class_destroy:
890 class_destroy(ilo_class);
891out:
892 return error;
893}
894
895static void __exit ilo_exit(void)
896{
897 pci_unregister_driver(&ilo_driver);
898 unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
899 class_destroy(ilo_class);
900}
901
Mark Ruskebf1b762012-11-06 14:33:13 -0600902MODULE_VERSION("1.4");
David Altobelli89bcb052008-07-02 09:38:53 -0600903MODULE_ALIAS(ILO_NAME);
904MODULE_DESCRIPTION(ILO_NAME);
905MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");
906MODULE_LICENSE("GPL v2");
907
Camuso, Tony98dcd592012-06-10 14:39:20 +0100908module_param(max_ccb, uint, 0444);
Mark Ruskebf1b762012-11-06 14:33:13 -0600909MODULE_PARM_DESC(max_ccb, "Maximum number of HP iLO channels to attach (16)");
Camuso, Tony98dcd592012-06-10 14:39:20 +0100910
David Altobelli89bcb052008-07-02 09:38:53 -0600911module_init(ilo_init);
912module_exit(ilo_exit);