2 * linux/arch/i386/kernel/mca.c
3 * Written by Martin Kolinek, February 1996
7 * Chris Beauregard July 28th, 1996
8 * - Fixed up integrated SCSI detection
10 * Chris Beauregard August 3rd, 1996
11 * - Made mca_info local
12 * - Made integrated registers accessible through standard function calls
14 * - More sanity checking
16 * Chris Beauregard August 9th, 1996
19 * Chris Beauregard January 7th, 1997
20 * - Added basic NMI-processing
21 * - Added more information to mca_info structure
23 * David Weinehall October 12th, 1998
24 * - Made a lot of cleaning up in the source
25 * - Added use of save_flags / restore_flags
26 * - Added the 'driver_loaded' flag in MCA_adapter
27 * - Added an alternative implemention of ZP Gu's mca_find_unused_adapter
29 * David Weinehall March 24th, 1999
30 * - Fixed the output of 'Driver Installed' in /proc/mca/pos
31 * - Made the Integrated Video & SCSI show up even if they have id 0000
33 * Alexander Viro November 9th, 1999
34 * - Switched to regular procfs methods
36 * Alfred Arnold & David Weinehall August 23rd, 2000
37 * - Added support for Planar POS-registers
40 #include <linux/module.h>
41 #include <linux/types.h>
42 #include <linux/errno.h>
43 #include <linux/kernel.h>
44 #include <linux/mca.h>
45 #include <linux/kprobes.h>
46 #include <asm/system.h>
48 #include <linux/proc_fs.h>
49 #include <linux/mman.h>
51 #include <linux/pagemap.h>
52 #include <linux/ioport.h>
53 #include <asm/uaccess.h>
54 #include <linux/init.h>
55 #include <asm/arch_hooks.h>
57 static unsigned char which_scsi = 0;
60 EXPORT_SYMBOL(MCA_bus);
63 * Motherboard register spinlock. Untested on SMP at the moment, but
64 * are there any MCA SMP boxes?
68 static DEFINE_SPINLOCK(mca_lock);
70 /* Build the status info for the adapter */
72 static void mca_configure_adapter_status(struct mca_device *mca_dev) {
73 mca_dev->status = MCA_ADAPTER_NONE;
75 mca_dev->pos_id = mca_dev->pos[0]
76 + (mca_dev->pos[1] << 8);
78 if(!mca_dev->pos_id && mca_dev->slot < MCA_MAX_SLOT_NR) {
80 /* id = 0x0000 usually indicates hardware failure,
81 * however, ZP Gu (zpg@castle.net> reports that his 9556
82 * has 0x0000 as id and everything still works. There
83 * also seem to be an adapter with id = 0x0000; the
84 * NCR Parallel Bus Memory Card. Until this is confirmed,
85 * however, this code will stay.
88 mca_dev->status = MCA_ADAPTER_ERROR;
91 } else if(mca_dev->pos_id != 0xffff) {
93 /* 0xffff usually indicates that there's no adapter,
94 * however, some integrated adapters may have 0xffff as
95 * their id and still be valid. Examples are on-board
96 * VGA of the 55sx, the integrated SCSI of the 56 & 57,
97 * and possibly also the 95 ULTIMEDIA.
100 mca_dev->status = MCA_ADAPTER_NORMAL;
103 if((mca_dev->pos_id == 0xffff ||
104 mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) {
107 for(j = 2; j < 8; j++) {
108 if(mca_dev->pos[j] != 0xff) {
109 mca_dev->status = MCA_ADAPTER_NORMAL;
115 if(!(mca_dev->pos[2] & MCA_ENABLED)) {
117 /* enabled bit is in POS 2 */
119 mca_dev->status = MCA_ADAPTER_DISABLED;
121 } /* mca_configure_adapter_status */
123 /*--------------------------------------------------------------------*/
125 static struct resource mca_standard_resources[] = {
126 { .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" },
127 { .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" },
128 { .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" },
129 { .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" },
130 { .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" },
131 { .start = 0x96, .end = 0x97, .name = "POS (MCA)" },
132 { .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
135 #define MCA_STANDARD_RESOURCES ARRAY_SIZE(mca_standard_resources)
138 * mca_read_and_store_pos - read the POS registers into a memory buffer
139 * @pos: a char pointer to 8 bytes, contains the POS register value on
142 * Returns 1 if a card actually exists (i.e. the pos isn't
143 * all 0xff) or 0 otherwise
145 static int mca_read_and_store_pos(unsigned char *pos) {
150 if((pos[j] = inb_p(MCA_POS_REG(j))) != 0xff) {
151 /* 0xff all across means no device. 0x00 means
152 * something's broken, but a device is
153 * probably there. However, if you get 0x00
154 * from a motherboard register it won't matter
155 * what we find. For the record, on the
156 * 57SLC, the integrated SCSI adapter has
157 * 0xffff for the adapter ID, but nonzero for
158 * other registers. */
166 static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg)
171 if(reg < 0 || reg >= 8)
174 spin_lock_irqsave(&mca_lock, flags);
175 if(mca_dev->pos_register) {
176 /* Disable adapter setup, enable motherboard setup */
178 outb_p(0, MCA_ADAPTER_SETUP_REG);
179 outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
181 byte = inb_p(MCA_POS_REG(reg));
182 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
185 /* Make sure motherboard setup is off */
187 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
189 /* Read the appropriate register */
191 outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG);
192 byte = inb_p(MCA_POS_REG(reg));
193 outb_p(0, MCA_ADAPTER_SETUP_REG);
195 spin_unlock_irqrestore(&mca_lock, flags);
197 mca_dev->pos[reg] = byte;
202 static void mca_pc_write_pos(struct mca_device *mca_dev, int reg,
207 if(reg < 0 || reg >= 8)
210 spin_lock_irqsave(&mca_lock, flags);
212 /* Make sure motherboard setup is off */
214 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
216 /* Read in the appropriate register */
218 outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG);
219 outb_p(byte, MCA_POS_REG(reg));
220 outb_p(0, MCA_ADAPTER_SETUP_REG);
222 spin_unlock_irqrestore(&mca_lock, flags);
224 /* Update the global register list, while we have the byte */
226 mca_dev->pos[reg] = byte;
230 /* for the primary MCA bus, we have identity transforms */
231 static int mca_dummy_transform_irq(struct mca_device * mca_dev, int irq)
236 static int mca_dummy_transform_ioport(struct mca_device * mca_dev, int port)
241 static void *mca_dummy_transform_memory(struct mca_device * mca_dev, void *mem)
247 static int __init mca_init(void)
250 struct mca_device *mca_dev;
251 unsigned char pos[8];
252 short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00};
255 /* WARNING: Be careful when making changes here. Putting an adapter
256 * and the motherboard simultaneously into setup mode may result in
257 * damage to chips (according to The Indispensible PC Hardware Book
258 * by Hans-Peter Messmer). Also, we disable system interrupts (so
259 * that we are not disturbed in the middle of this).
262 /* Make sure the MCA bus is present */
264 if (mca_system_init()) {
265 printk(KERN_ERR "MCA bus system initialisation failed\n");
272 printk(KERN_INFO "Micro Channel bus detected.\n");
274 /* All MCA systems have at least a primary bus */
275 bus = mca_attach_bus(MCA_PRIMARY_BUS);
278 bus->default_dma_mask = 0xffffffffLL;
279 bus->f.mca_write_pos = mca_pc_write_pos;
280 bus->f.mca_read_pos = mca_pc_read_pos;
281 bus->f.mca_transform_irq = mca_dummy_transform_irq;
282 bus->f.mca_transform_ioport = mca_dummy_transform_ioport;
283 bus->f.mca_transform_memory = mca_dummy_transform_memory;
285 /* get the motherboard device */
286 mca_dev = kzalloc(sizeof(struct mca_device), GFP_KERNEL);
287 if(unlikely(!mca_dev))
291 * We do not expect many MCA interrupts during initialization,
292 * but let us be safe:
294 spin_lock_irq(&mca_lock);
296 /* Make sure adapter setup is off */
298 outb_p(0, MCA_ADAPTER_SETUP_REG);
300 /* Read motherboard POS registers */
302 mca_dev->pos_register = 0x7f;
303 outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
304 mca_dev->name[0] = 0;
305 mca_read_and_store_pos(mca_dev->pos);
306 mca_configure_adapter_status(mca_dev);
307 /* fake POS and slot for a motherboard */
308 mca_dev->pos_id = MCA_MOTHERBOARD_POS;
309 mca_dev->slot = MCA_MOTHERBOARD;
310 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
312 mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
313 if(unlikely(!mca_dev))
314 goto out_unlock_nomem;
316 /* Put motherboard into video setup mode, read integrated video
317 * POS registers, and turn motherboard setup off.
320 mca_dev->pos_register = 0xdf;
321 outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
322 mca_dev->name[0] = 0;
323 mca_read_and_store_pos(mca_dev->pos);
324 mca_configure_adapter_status(mca_dev);
325 /* fake POS and slot for the integrated video */
326 mca_dev->pos_id = MCA_INTEGVIDEO_POS;
327 mca_dev->slot = MCA_INTEGVIDEO;
328 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
330 /* Put motherboard into scsi setup mode, read integrated scsi
331 * POS registers, and turn motherboard setup off.
333 * It seems there are two possible SCSI registers. Martin says that
334 * for the 56,57, 0xf7 is the one, but fails on the 76.
335 * Alfredo (apena@vnet.ibm.com) says
336 * 0xfd works on his machine. We'll try both of them. I figure it's
337 * a good bet that only one could be valid at a time. This could
338 * screw up though if one is used for something else on the other
342 for(i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) {
343 outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG);
344 if(mca_read_and_store_pos(pos))
348 /* found a scsi card */
349 mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
350 if(unlikely(!mca_dev))
351 goto out_unlock_nomem;
353 for(j = 0; j < 8; j++)
354 mca_dev->pos[j] = pos[j];
356 mca_configure_adapter_status(mca_dev);
357 /* fake POS and slot for integrated SCSI controller */
358 mca_dev->pos_id = MCA_INTEGSCSI_POS;
359 mca_dev->slot = MCA_INTEGSCSI;
360 mca_dev->pos_register = which_scsi;
361 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
364 /* Turn off motherboard setup */
366 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
368 /* Now loop over MCA slots: put each adapter into setup mode, and
369 * read its POS registers. Then put adapter setup off.
372 for(i=0; i<MCA_MAX_SLOT_NR; i++) {
373 outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG);
374 if(!mca_read_and_store_pos(pos))
377 mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
378 if(unlikely(!mca_dev))
379 goto out_unlock_nomem;
382 mca_dev->pos[j]=pos[j];
384 mca_dev->driver_loaded = 0;
386 mca_dev->pos_register = 0;
387 mca_configure_adapter_status(mca_dev);
388 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
390 outb_p(0, MCA_ADAPTER_SETUP_REG);
392 /* Enable interrupts and return memory start */
393 spin_unlock_irq(&mca_lock);
395 for (i = 0; i < MCA_STANDARD_RESOURCES; i++)
396 request_resource(&ioport_resource, mca_standard_resources + i);
403 spin_unlock_irq(&mca_lock);
405 printk(KERN_EMERG "Failed memory allocation in MCA setup!\n");
409 subsys_initcall(mca_init);
411 /*--------------------------------------------------------------------*/
413 static __kprobes void
414 mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
416 int slot = mca_dev->slot;
418 if(slot == MCA_INTEGSCSI) {
419 printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n",
421 } else if(slot == MCA_INTEGVIDEO) {
422 printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n",
424 } else if(slot == MCA_MOTHERBOARD) {
425 printk(KERN_CRIT "NMI: caused by motherboard (%s)\n",
429 /* More info available in POS 6 and 7? */
432 unsigned char pos6, pos7;
434 pos6 = mca_device_read_pos(mca_dev, 6);
435 pos7 = mca_device_read_pos(mca_dev, 7);
437 printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7);
440 } /* mca_handle_nmi_slot */
442 /*--------------------------------------------------------------------*/
444 static int __kprobes mca_handle_nmi_callback(struct device *dev, void *data)
446 struct mca_device *mca_dev = to_mca_device(dev);
449 pos5 = mca_device_read_pos(mca_dev, 5);
452 /* Bit 7 of POS 5 is reset when this adapter has a hardware
453 * error. Bit 7 it reset if there's error information
454 * available in POS 6 and 7.
456 mca_handle_nmi_device(mca_dev, !(pos5 & 0x40));
462 void __kprobes mca_handle_nmi(void)
464 /* First try - scan the various adapters and see if a specific
465 * adapter was responsible for the error.
467 bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback);
470 } /* mca_handle_nmi */