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authorBrent Casavant <bcasavan@sgi.com>2006-10-17 03:09:25 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-17 11:18:42 -0400
commit59f148005cfd3d41537a4b872c266213d5fe4dc6 (patch)
tree1e769ca80218a39417f7d45759e1bd2a4dbf6452 /drivers/sn/ioc4.c
parent107d5a72f2c6a6819b66eebcb0281c7a67b6baaa (diff)
[PATCH] ioc4: Enable build on non-SN2
The SGI PCI-RT card, based on the SGI IOC4 chip, will be made available on Altix XE (x86_64) platforms in the near future. As such it is now a misnomer for the IOC4 base device driver to live under drivers/sn, and would complicate builds for non-SN2. This patch moves the IOC4 base driver code from drivers/sn to drivers/misc, and updates the associated Makefiles and Kconfig files to allow building on non-SN2 configs. Due to the resulting change in link order, it is now necessary to use late_initcall() for IOC4 subdriver initialization. [akpm@osdl.org: __udivdi3 fix] [akpm@osdl.org: fix default in Kconfig] Acked-by: Pat Gefre <pfg@sgi.com> Acked-by: Jeremy Higdon <jeremy@sgi.com> Signed-off-by: Brent Casavant <bcasavan@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/sn/ioc4.c')
-rw-r--r--drivers/sn/ioc4.c474
1 files changed, 0 insertions, 474 deletions
diff --git a/drivers/sn/ioc4.c b/drivers/sn/ioc4.c
deleted file mode 100644
index 83d2e90c581c..000000000000
--- a/drivers/sn/ioc4.c
+++ /dev/null
@@ -1,474 +0,0 @@
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2005-2006 Silicon Graphics, Inc. All Rights Reserved.
7 */
8
9/* This file contains the master driver module for use by SGI IOC4 subdrivers.
10 *
11 * It allocates any resources shared between multiple subdevices, and
12 * provides accessor functions (where needed) and the like for those
13 * resources. It also provides a mechanism for the subdevice modules
14 * to support loading and unloading.
15 *
16 * Non-shared resources (e.g. external interrupt A_INT_OUT register page
17 * alias, serial port and UART registers) are handled by the subdevice
18 * modules themselves.
19 *
20 * This is all necessary because IOC4 is not implemented as a multi-function
21 * PCI device, but an amalgamation of disparate registers for several
22 * types of device (ATA, serial, external interrupts). The normal
23 * resource management in the kernel doesn't have quite the right interfaces
24 * to handle this situation (e.g. multiple modules can't claim the same
25 * PCI ID), thus this IOC4 master module.
26 */
27
28#include <linux/errno.h>
29#include <linux/module.h>
30#include <linux/pci.h>
31#include <linux/ioc4.h>
32#include <linux/ktime.h>
33#include <linux/mutex.h>
34#include <linux/time.h>
35#include <asm/sn/addrs.h>
36#include <asm/sn/clksupport.h>
37#include <asm/sn/shub_mmr.h>
38
39/***************
40 * Definitions *
41 ***************/
42
43/* Tweakable values */
44
45/* PCI bus speed detection/calibration */
46#define IOC4_CALIBRATE_COUNT 63 /* Calibration cycle period */
47#define IOC4_CALIBRATE_CYCLES 256 /* Average over this many cycles */
48#define IOC4_CALIBRATE_DISCARD 2 /* Discard first few cycles */
49#define IOC4_CALIBRATE_LOW_MHZ 25 /* Lower bound on bus speed sanity */
50#define IOC4_CALIBRATE_HIGH_MHZ 75 /* Upper bound on bus speed sanity */
51#define IOC4_CALIBRATE_DEFAULT_MHZ 66 /* Assumed if sanity check fails */
52
53/************************
54 * Submodule management *
55 ************************/
56
57static DEFINE_MUTEX(ioc4_mutex);
58
59static LIST_HEAD(ioc4_devices);
60static LIST_HEAD(ioc4_submodules);
61
62/* Register an IOC4 submodule */
63int
64ioc4_register_submodule(struct ioc4_submodule *is)
65{
66 struct ioc4_driver_data *idd;
67
68 mutex_lock(&ioc4_mutex);
69 list_add(&is->is_list, &ioc4_submodules);
70
71 /* Initialize submodule for each IOC4 */
72 if (!is->is_probe)
73 goto out;
74
75 list_for_each_entry(idd, &ioc4_devices, idd_list) {
76 if (is->is_probe(idd)) {
77 printk(KERN_WARNING
78 "%s: IOC4 submodule %s probe failed "
79 "for pci_dev %s",
80 __FUNCTION__, module_name(is->is_owner),
81 pci_name(idd->idd_pdev));
82 }
83 }
84 out:
85 mutex_unlock(&ioc4_mutex);
86 return 0;
87}
88
89/* Unregister an IOC4 submodule */
90void
91ioc4_unregister_submodule(struct ioc4_submodule *is)
92{
93 struct ioc4_driver_data *idd;
94
95 mutex_lock(&ioc4_mutex);
96 list_del(&is->is_list);
97
98 /* Remove submodule for each IOC4 */
99 if (!is->is_remove)
100 goto out;
101
102 list_for_each_entry(idd, &ioc4_devices, idd_list) {
103 if (is->is_remove(idd)) {
104 printk(KERN_WARNING
105 "%s: IOC4 submodule %s remove failed "
106 "for pci_dev %s.\n",
107 __FUNCTION__, module_name(is->is_owner),
108 pci_name(idd->idd_pdev));
109 }
110 }
111 out:
112 mutex_unlock(&ioc4_mutex);
113}
114
115/*********************
116 * Device management *
117 *********************/
118
119#define IOC4_CALIBRATE_LOW_LIMIT \
120 (1000*IOC4_EXTINT_COUNT_DIVISOR/IOC4_CALIBRATE_LOW_MHZ)
121#define IOC4_CALIBRATE_HIGH_LIMIT \
122 (1000*IOC4_EXTINT_COUNT_DIVISOR/IOC4_CALIBRATE_HIGH_MHZ)
123#define IOC4_CALIBRATE_DEFAULT \
124 (1000*IOC4_EXTINT_COUNT_DIVISOR/IOC4_CALIBRATE_DEFAULT_MHZ)
125
126#define IOC4_CALIBRATE_END \
127 (IOC4_CALIBRATE_CYCLES + IOC4_CALIBRATE_DISCARD)
128
129#define IOC4_INT_OUT_MODE_TOGGLE 0x7 /* Toggle INT_OUT every COUNT+1 ticks */
130
131/* Determines external interrupt output clock period of the PCI bus an
132 * IOC4 is attached to. This value can be used to determine the PCI
133 * bus speed.
134 *
135 * IOC4 has a design feature that various internal timers are derived from
136 * the PCI bus clock. This causes IOC4 device drivers to need to take the
137 * bus speed into account when setting various register values (e.g. INT_OUT
138 * register COUNT field, UART divisors, etc). Since this information is
139 * needed by several subdrivers, it is determined by the main IOC4 driver,
140 * even though the following code utilizes external interrupt registers
141 * to perform the speed calculation.
142 */
143static void
144ioc4_clock_calibrate(struct ioc4_driver_data *idd)
145{
146 union ioc4_int_out int_out;
147 union ioc4_gpcr gpcr;
148 unsigned int state, last_state = 1;
149 struct timespec start_ts, end_ts;
150 uint64_t start, end, period;
151 unsigned int count = 0;
152
153 /* Enable output */
154 gpcr.raw = 0;
155 gpcr.fields.dir = IOC4_GPCR_DIR_0;
156 gpcr.fields.int_out_en = 1;
157 writel(gpcr.raw, &idd->idd_misc_regs->gpcr_s.raw);
158
159 /* Reset to power-on state */
160 writel(0, &idd->idd_misc_regs->int_out.raw);
161 mmiowb();
162
163 /* Set up square wave */
164 int_out.raw = 0;
165 int_out.fields.count = IOC4_CALIBRATE_COUNT;
166 int_out.fields.mode = IOC4_INT_OUT_MODE_TOGGLE;
167 int_out.fields.diag = 0;
168 writel(int_out.raw, &idd->idd_misc_regs->int_out.raw);
169 mmiowb();
170
171 /* Check square wave period averaged over some number of cycles */
172 do {
173 int_out.raw = readl(&idd->idd_misc_regs->int_out.raw);
174 state = int_out.fields.int_out;
175 if (!last_state && state) {
176 count++;
177 if (count == IOC4_CALIBRATE_END) {
178 ktime_get_ts(&end_ts);
179 break;
180 } else if (count == IOC4_CALIBRATE_DISCARD)
181 ktime_get_ts(&start_ts);
182 }
183 last_state = state;
184 } while (1);
185
186 /* Calculation rearranged to preserve intermediate precision.
187 * Logically:
188 * 1. "end - start" gives us the measurement period over all
189 * the square wave cycles.
190 * 2. Divide by number of square wave cycles to get the period
191 * of a square wave cycle.
192 * 3. Divide by 2*(int_out.fields.count+1), which is the formula
193 * by which the IOC4 generates the square wave, to get the
194 * period of an IOC4 INT_OUT count.
195 */
196 end = end_ts.tv_sec * NSEC_PER_SEC + end_ts.tv_nsec;
197 start = start_ts.tv_sec * NSEC_PER_SEC + start_ts.tv_nsec;
198 period = (end - start) /
199 (IOC4_CALIBRATE_CYCLES * 2 * (IOC4_CALIBRATE_COUNT + 1));
200
201 /* Bounds check the result. */
202 if (period > IOC4_CALIBRATE_LOW_LIMIT ||
203 period < IOC4_CALIBRATE_HIGH_LIMIT) {
204 printk(KERN_INFO
205 "IOC4 %s: Clock calibration failed. Assuming"
206 "PCI clock is %d ns.\n",
207 pci_name(idd->idd_pdev),
208 IOC4_CALIBRATE_DEFAULT / IOC4_EXTINT_COUNT_DIVISOR);
209 period = IOC4_CALIBRATE_DEFAULT;
210 } else {
211 printk(KERN_DEBUG
212 "IOC4 %s: PCI clock is %ld ns.\n",
213 pci_name(idd->idd_pdev),
214 period / IOC4_EXTINT_COUNT_DIVISOR);
215 }
216
217 /* Remember results. We store the extint clock period rather
218 * than the PCI clock period so that greater precision is
219 * retained. Divide by IOC4_EXTINT_COUNT_DIVISOR to get
220 * PCI clock period.
221 */
222 idd->count_period = period;
223}
224
225/* There are three variants of IOC4 cards: IO9, IO10, and PCI-RT.
226 * Each brings out different combinations of IOC4 signals, thus.
227 * the IOC4 subdrivers need to know to which we're attached.
228 *
229 * We look for the presence of a SCSI (IO9) or SATA (IO10) controller
230 * on the same PCI bus at slot number 3 to differentiate IO9 from IO10.
231 * If neither is present, it's a PCI-RT.
232 */
233static unsigned int
234ioc4_variant(struct ioc4_driver_data *idd)
235{
236 struct pci_dev *pdev = NULL;
237 int found = 0;
238
239 /* IO9: Look for a QLogic ISP 12160 at the same bus and slot 3. */
240 do {
241 pdev = pci_get_device(PCI_VENDOR_ID_QLOGIC,
242 PCI_DEVICE_ID_QLOGIC_ISP12160, pdev);
243 if (pdev &&
244 idd->idd_pdev->bus->number == pdev->bus->number &&
245 3 == PCI_SLOT(pdev->devfn))
246 found = 1;
247 pci_dev_put(pdev);
248 } while (pdev && !found);
249 if (NULL != pdev)
250 return IOC4_VARIANT_IO9;
251
252 /* IO10: Look for a Vitesse VSC 7174 at the same bus and slot 3. */
253 pdev = NULL;
254 do {
255 pdev = pci_get_device(PCI_VENDOR_ID_VITESSE,
256 PCI_DEVICE_ID_VITESSE_VSC7174, pdev);
257 if (pdev &&
258 idd->idd_pdev->bus->number == pdev->bus->number &&
259 3 == PCI_SLOT(pdev->devfn))
260 found = 1;
261 pci_dev_put(pdev);
262 } while (pdev && !found);
263 if (NULL != pdev)
264 return IOC4_VARIANT_IO10;
265
266 /* PCI-RT: No SCSI/SATA controller will be present */
267 return IOC4_VARIANT_PCI_RT;
268}
269
270/* Adds a new instance of an IOC4 card */
271static int
272ioc4_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
273{
274 struct ioc4_driver_data *idd;
275 struct ioc4_submodule *is;
276 uint32_t pcmd;
277 int ret;
278
279 /* Enable IOC4 and take ownership of it */
280 if ((ret = pci_enable_device(pdev))) {
281 printk(KERN_WARNING
282 "%s: Failed to enable IOC4 device for pci_dev %s.\n",
283 __FUNCTION__, pci_name(pdev));
284 goto out;
285 }
286 pci_set_master(pdev);
287
288 /* Set up per-IOC4 data */
289 idd = kmalloc(sizeof(struct ioc4_driver_data), GFP_KERNEL);
290 if (!idd) {
291 printk(KERN_WARNING
292 "%s: Failed to allocate IOC4 data for pci_dev %s.\n",
293 __FUNCTION__, pci_name(pdev));
294 ret = -ENODEV;
295 goto out_idd;
296 }
297 idd->idd_pdev = pdev;
298 idd->idd_pci_id = pci_id;
299
300 /* Map IOC4 misc registers. These are shared between subdevices
301 * so the main IOC4 module manages them.
302 */
303 idd->idd_bar0 = pci_resource_start(idd->idd_pdev, 0);
304 if (!idd->idd_bar0) {
305 printk(KERN_WARNING
306 "%s: Unable to find IOC4 misc resource "
307 "for pci_dev %s.\n",
308 __FUNCTION__, pci_name(idd->idd_pdev));
309 ret = -ENODEV;
310 goto out_pci;
311 }
312 if (!request_region(idd->idd_bar0, sizeof(struct ioc4_misc_regs),
313 "ioc4_misc")) {
314 printk(KERN_WARNING
315 "%s: Unable to request IOC4 misc region "
316 "for pci_dev %s.\n",
317 __FUNCTION__, pci_name(idd->idd_pdev));
318 ret = -ENODEV;
319 goto out_pci;
320 }
321 idd->idd_misc_regs = ioremap(idd->idd_bar0,
322 sizeof(struct ioc4_misc_regs));
323 if (!idd->idd_misc_regs) {
324 printk(KERN_WARNING
325 "%s: Unable to remap IOC4 misc region "
326 "for pci_dev %s.\n",
327 __FUNCTION__, pci_name(idd->idd_pdev));
328 ret = -ENODEV;
329 goto out_misc_region;
330 }
331
332 /* Failsafe portion of per-IOC4 initialization */
333
334 /* Detect card variant */
335 idd->idd_variant = ioc4_variant(idd);
336 printk(KERN_INFO "IOC4 %s: %s card detected.\n", pci_name(pdev),
337 idd->idd_variant == IOC4_VARIANT_IO9 ? "IO9" :
338 idd->idd_variant == IOC4_VARIANT_PCI_RT ? "PCI-RT" :
339 idd->idd_variant == IOC4_VARIANT_IO10 ? "IO10" : "unknown");
340
341 /* Initialize IOC4 */
342 pci_read_config_dword(idd->idd_pdev, PCI_COMMAND, &pcmd);
343 pci_write_config_dword(idd->idd_pdev, PCI_COMMAND,
344 pcmd | PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
345
346 /* Determine PCI clock */
347 ioc4_clock_calibrate(idd);
348
349 /* Disable/clear all interrupts. Need to do this here lest
350 * one submodule request the shared IOC4 IRQ, but interrupt
351 * is generated by a different subdevice.
352 */
353 /* Disable */
354 writel(~0, &idd->idd_misc_regs->other_iec.raw);
355 writel(~0, &idd->idd_misc_regs->sio_iec);
356 /* Clear (i.e. acknowledge) */
357 writel(~0, &idd->idd_misc_regs->other_ir.raw);
358 writel(~0, &idd->idd_misc_regs->sio_ir);
359
360 /* Track PCI-device specific data */
361 idd->idd_serial_data = NULL;
362 pci_set_drvdata(idd->idd_pdev, idd);
363
364 mutex_lock(&ioc4_mutex);
365 list_add_tail(&idd->idd_list, &ioc4_devices);
366
367 /* Add this IOC4 to all submodules */
368 list_for_each_entry(is, &ioc4_submodules, is_list) {
369 if (is->is_probe && is->is_probe(idd)) {
370 printk(KERN_WARNING
371 "%s: IOC4 submodule 0x%s probe failed "
372 "for pci_dev %s.\n",
373 __FUNCTION__, module_name(is->is_owner),
374 pci_name(idd->idd_pdev));
375 }
376 }
377 mutex_unlock(&ioc4_mutex);
378
379 return 0;
380
381out_misc_region:
382 release_region(idd->idd_bar0, sizeof(struct ioc4_misc_regs));
383out_pci:
384 kfree(idd);
385out_idd:
386 pci_disable_device(pdev);
387out:
388 return ret;
389}
390
391/* Removes a particular instance of an IOC4 card. */
392static void
393ioc4_remove(struct pci_dev *pdev)
394{
395 struct ioc4_submodule *is;
396 struct ioc4_driver_data *idd;
397
398 idd = pci_get_drvdata(pdev);
399
400 /* Remove this IOC4 from all submodules */
401 mutex_lock(&ioc4_mutex);
402 list_for_each_entry(is, &ioc4_submodules, is_list) {
403 if (is->is_remove && is->is_remove(idd)) {
404 printk(KERN_WARNING
405 "%s: IOC4 submodule 0x%s remove failed "
406 "for pci_dev %s.\n",
407 __FUNCTION__, module_name(is->is_owner),
408 pci_name(idd->idd_pdev));
409 }
410 }
411 mutex_unlock(&ioc4_mutex);
412
413 /* Release resources */
414 iounmap(idd->idd_misc_regs);
415 if (!idd->idd_bar0) {
416 printk(KERN_WARNING
417 "%s: Unable to get IOC4 misc mapping for pci_dev %s. "
418 "Device removal may be incomplete.\n",
419 __FUNCTION__, pci_name(idd->idd_pdev));
420 }
421 release_region(idd->idd_bar0, sizeof(struct ioc4_misc_regs));
422
423 /* Disable IOC4 and relinquish */
424 pci_disable_device(pdev);
425
426 /* Remove and free driver data */
427 mutex_lock(&ioc4_mutex);
428 list_del(&idd->idd_list);
429 mutex_unlock(&ioc4_mutex);
430 kfree(idd);
431}
432
433static struct pci_device_id ioc4_id_table[] = {
434 {PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC4, PCI_ANY_ID,
435 PCI_ANY_ID, 0x0b4000, 0xFFFFFF},
436 {0}
437};
438
439static struct pci_driver ioc4_driver = {
440 .name = "IOC4",
441 .id_table = ioc4_id_table,
442 .probe = ioc4_probe,
443 .remove = ioc4_remove,
444};
445
446MODULE_DEVICE_TABLE(pci, ioc4_id_table);
447
448/*********************
449 * Module management *
450 *********************/
451
452/* Module load */
453static int __devinit
454ioc4_init(void)
455{
456 return pci_register_driver(&ioc4_driver);
457}
458
459/* Module unload */
460static void __devexit
461ioc4_exit(void)
462{
463 pci_unregister_driver(&ioc4_driver);
464}
465
466module_init(ioc4_init);
467module_exit(ioc4_exit);
468
469MODULE_AUTHOR("Brent Casavant - Silicon Graphics, Inc. <bcasavan@sgi.com>");
470MODULE_DESCRIPTION("PCI driver master module for SGI IOC4 Base-IO Card");
471MODULE_LICENSE("GPL");
472
473EXPORT_SYMBOL(ioc4_register_submodule);
474EXPORT_SYMBOL(ioc4_unregister_submodule);
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