1 /*
2 * PMC-Sierra MSP board specific pci_ops
3 *
4 * Copyright 2001 MontaVista Software Inc.
5 * Copyright 2005-2007 PMC-Sierra, Inc
6 *
7 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
8 *
9 * Much of the code is derived from the original DDB5074 port by
10 * Geert Uytterhoeven <geert@sonycom.com>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 *
17 */
18
19 #define PCI_COUNTERS 1
20
21 #include <linux/types.h>
22 #include <linux/pci.h>
23 #include <linux/interrupt.h>
24
25 #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
26 #include <linux/proc_fs.h>
27 #include <linux/seq_file.h>
28 #endif /* CONFIG_PROC_FS && PCI_COUNTERS */
29
30 #include <linux/kernel.h>
31 #include <linux/init.h>
32
33 #include <asm/byteorder.h>
34 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
35 #include <asm/mipsmtregs.h>
36 #endif
37
38 #include <msp_prom.h>
39 #include <msp_cic_int.h>
40 #include <msp_pci.h>
41 #include <msp_regs.h>
42 #include <msp_regops.h>
43
44 #define PCI_ACCESS_READ 0
45 #define PCI_ACCESS_WRITE 1
46
47 #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
48 static char proc_init;
49 extern struct proc_dir_entry *proc_bus_pci_dir;
50 unsigned int pci_int_count[32];
51
52 static void pci_proc_init(void);
53
54 /*****************************************************************************
55 *
56 * FUNCTION: read_msp_pci_counts
57 * _________________________________________________________________________
58 *
59 * DESCRIPTION: Prints the count of how many times each PCI
60 * interrupt has asserted. Can be invoked by the
61 * /proc filesystem.
62 *
63 * INPUTS: page - part of STDOUT calculation
64 * off - part of STDOUT calculation
65 * count - part of STDOUT calculation
66 * data - unused
67 *
68 * OUTPUTS: start - new start location
69 * eof - end of file pointer
70 *
71 * RETURNS: len - STDOUT length
72 *
73 ****************************************************************************/
read_msp_pci_counts(char * page,char ** start,off_t off,int count,int * eof,void * data)74 static int read_msp_pci_counts(char *page, char **start, off_t off,
75 int count, int *eof, void *data)
76 {
77 int i;
78 int len = 0;
79 unsigned int intcount, total = 0;
80
81 for (i = 0; i < 32; ++i) {
82 intcount = pci_int_count[i];
83 if (intcount != 0) {
84 len += sprintf(page + len, "[%d] = %u\n", i, intcount);
85 total += intcount;
86 }
87 }
88
89 len += sprintf(page + len, "total = %u\n", total);
90 if (len <= off+count)
91 *eof = 1;
92
93 *start = page + off;
94 len -= off;
95 if (len > count)
96 len = count;
97 if (len < 0)
98 len = 0;
99
100 return len;
101 }
102
103 /*****************************************************************************
104 *
105 * FUNCTION: gen_pci_cfg_wr
106 * _________________________________________________________________________
107 *
108 * DESCRIPTION: Generates a configuration write cycle for debug purposes.
109 * The IDSEL line asserted and location and data written are
110 * immaterial. Just want to be able to prove that a
111 * configuration write can be correctly generated on the
112 * PCI bus. Intent is that this function by invocable from
113 * the /proc filesystem.
114 *
115 * INPUTS: page - part of STDOUT calculation
116 * off - part of STDOUT calculation
117 * count - part of STDOUT calculation
118 * data - unused
119 *
120 * OUTPUTS: start - new start location
121 * eof - end of file pointer
122 *
123 * RETURNS: len - STDOUT length
124 *
125 ****************************************************************************/
gen_pci_cfg_wr(char * page,char ** start,off_t off,int count,int * eof,void * data)126 static int gen_pci_cfg_wr(char *page, char **start, off_t off,
127 int count, int *eof, void *data)
128 {
129 unsigned char where = 0; /* Write to static Device/Vendor ID */
130 unsigned char bus_num = 0; /* Bus 0 */
131 unsigned char dev_fn = 0xF; /* Arbitrary device number */
132 u32 wr_data = 0xFF00AA00; /* Arbitrary data */
133 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
134 int len = 0;
135 unsigned long value;
136 int intr;
137
138 len += sprintf(page + len, "PMC MSP PCI: Beginning\n");
139
140 if (proc_init == 0) {
141 pci_proc_init();
142 proc_init = ~0;
143 }
144
145 len += sprintf(page + len, "PMC MSP PCI: Before Cfg Wr\n");
146
147 /*
148 * Generate PCI Configuration Write Cycle
149 */
150
151 /* Clear cause register bits */
152 preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
153
154 /* Setup address that is to appear on PCI bus */
155 preg->config_addr = BPCI_CFGADDR_ENABLE |
156 (bus_num << BPCI_CFGADDR_BUSNUM_SHF) |
157 (dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) |
158 (where & 0xFC);
159
160 value = cpu_to_le32(wr_data);
161
162 /* Launch the PCI configuration write cycle */
163 *PCI_CONFIG_SPACE_REG = value;
164
165 /*
166 * Check if the PCI configuration cycle (rd or wr) succeeded, by
167 * checking the status bits for errors like master or target abort.
168 */
169 intr = preg->if_status;
170
171 len += sprintf(page + len, "PMC MSP PCI: After Cfg Wr\n");
172
173 /* Handle STDOUT calculations */
174 if (len <= off+count)
175 *eof = 1;
176 *start = page + off;
177 len -= off;
178 if (len > count)
179 len = count;
180 if (len < 0)
181 len = 0;
182
183 return len;
184 }
185
186 /*****************************************************************************
187 *
188 * FUNCTION: pci_proc_init
189 * _________________________________________________________________________
190 *
191 * DESCRIPTION: Create entries in the /proc filesystem for debug access.
192 *
193 * INPUTS: none
194 *
195 * OUTPUTS: none
196 *
197 * RETURNS: none
198 *
199 ****************************************************************************/
pci_proc_init(void)200 static void pci_proc_init(void)
201 {
202 create_proc_read_entry("pmc_msp_pci_rd_cnt", 0, NULL,
203 read_msp_pci_counts, NULL);
204 create_proc_read_entry("pmc_msp_pci_cfg_wr", 0, NULL,
205 gen_pci_cfg_wr, NULL);
206 }
207 #endif /* CONFIG_PROC_FS && PCI_COUNTERS */
208
209 DEFINE_SPINLOCK(bpci_lock);
210
211 /*****************************************************************************
212 *
213 * STRUCT: pci_io_resource
214 * _________________________________________________________________________
215 *
216 * DESCRIPTION: Defines the address range that pciauto() will use to
217 * assign to the I/O BARs of PCI devices.
218 *
219 * Use the start and end addresses of the MSP7120 PCI Host
220 * Controller I/O space, in the form that they appear on the
221 * PCI bus AFTER MSP7120 has performed address translation.
222 *
223 * For I/O accesses, MSP7120 ignores OATRAN and maps I/O
224 * accesses into the bottom 0xFFF region of address space,
225 * so that is the range to put into the pci_io_resource
226 * struct.
227 *
228 * In MSP4200, the start address was 0x04 instead of the
229 * expected 0x00. Will just assume there was a good reason
230 * for this!
231 *
232 * NOTES: Linux, by default, will assign I/O space to the lowest
233 * region of address space. Since MSP7120 and Linux,
234 * by default, have no offset in between how they map, the
235 * io_offset element of pci_controller struct should be set
236 * to zero.
237 * ELEMENTS:
238 * name - String used for a meaningful name.
239 *
240 * start - Start address of MSP7120's I/O space, as MSP7120 presents
241 * the address on the PCI bus.
242 *
243 * end - End address of MSP7120's I/O space, as MSP7120 presents
244 * the address on the PCI bus.
245 *
246 * flags - Attributes indicating the type of resource. In this case,
247 * indicate I/O space.
248 *
249 ****************************************************************************/
250 static struct resource pci_io_resource = {
251 .name = "pci IO space",
252 .start = 0x04,
253 .end = 0x0FFF,
254 .flags = IORESOURCE_IO /* I/O space */
255 };
256
257 /*****************************************************************************
258 *
259 * STRUCT: pci_mem_resource
260 * _________________________________________________________________________
261 *
262 * DESCRIPTION: Defines the address range that pciauto() will use to
263 * assign to the memory BARs of PCI devices.
264 *
265 * The .start and .end values are dependent upon how address
266 * translation is performed by the OATRAN regiser.
267 *
268 * The values to use for .start and .end are the values
269 * in the form they appear on the PCI bus AFTER MSP7120 has
270 * performed OATRAN address translation.
271 *
272 * ELEMENTS:
273 * name - String used for a meaningful name.
274 *
275 * start - Start address of MSP7120's memory space, as MSP7120 presents
276 * the address on the PCI bus.
277 *
278 * end - End address of MSP7120's memory space, as MSP7120 presents
279 * the address on the PCI bus.
280 *
281 * flags - Attributes indicating the type of resource. In this case,
282 * indicate memory space.
283 *
284 ****************************************************************************/
285 static struct resource pci_mem_resource = {
286 .name = "pci memory space",
287 .start = MSP_PCI_SPACE_BASE,
288 .end = MSP_PCI_SPACE_END,
289 .flags = IORESOURCE_MEM /* memory space */
290 };
291
292 /*****************************************************************************
293 *
294 * FUNCTION: bpci_interrupt
295 * _________________________________________________________________________
296 *
297 * DESCRIPTION: PCI status interrupt handler. Updates the count of how
298 * many times each status bit has been set, then clears
299 * the status bits. If the appropriate macros are defined,
300 * these counts can be viewed via the /proc filesystem.
301 *
302 * INPUTS: irq - unused
303 * dev_id - unused
304 * pt_regs - unused
305 *
306 * OUTPUTS: none
307 *
308 * RETURNS: PCIBIOS_SUCCESSFUL - success
309 *
310 ****************************************************************************/
bpci_interrupt(int irq,void * dev_id)311 static int bpci_interrupt(int irq, void *dev_id)
312 {
313 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
314 unsigned int stat = preg->if_status;
315
316 #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
317 int i;
318 for (i = 0; i < 32; ++i) {
319 if ((1 << i) & stat)
320 ++pci_int_count[i];
321 }
322 #endif /* PROC_FS && PCI_COUNTERS */
323
324 /* printk("PCI ISR: Status=%08X\n", stat); */
325
326 /* write to clear all asserted interrupts */
327 preg->if_status = stat;
328
329 return PCIBIOS_SUCCESSFUL;
330 }
331
332 /*****************************************************************************
333 *
334 * FUNCTION: msp_pcibios_config_access
335 * _________________________________________________________________________
336 *
337 * DESCRIPTION: Performs a PCI configuration access (rd or wr), then
338 * checks that the access succeeded by querying MSP7120's
339 * PCI status bits.
340 *
341 * INPUTS:
342 * access_type - kind of PCI configuration cycle to perform
343 * (read or write). Legal values are
344 * PCI_ACCESS_WRITE and PCI_ACCESS_READ.
345 *
346 * bus - pointer to the bus number of the device to
347 * be targetted for the configuration cycle.
348 * The only element of the pci_bus structure
349 * used is bus->number. This argument determines
350 * if the configuration access will be Type 0 or
351 * Type 1. Since MSP7120 assumes itself to be the
352 * PCI Host, any non-zero bus->number generates
353 * a Type 1 access.
354 *
355 * devfn - this is an 8-bit field. The lower three bits
356 * specify the function number of the device to
357 * be targetted for the configuration cycle, with
358 * all three-bit combinations being legal. The
359 * upper five bits specify the device number,
360 * with legal values being 10 to 31.
361 *
362 * where - address within the Configuration Header
363 * space to access.
364 *
365 * data - for write accesses, contains the data to
366 * write.
367 *
368 * OUTPUTS:
369 * data - for read accesses, contains the value read.
370 *
371 * RETURNS: PCIBIOS_SUCCESSFUL - success
372 * -1 - access failure
373 *
374 ****************************************************************************/
msp_pcibios_config_access(unsigned char access_type,struct pci_bus * bus,unsigned int devfn,unsigned char where,u32 * data)375 int msp_pcibios_config_access(unsigned char access_type,
376 struct pci_bus *bus,
377 unsigned int devfn,
378 unsigned char where,
379 u32 *data)
380 {
381 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
382 unsigned char bus_num = bus->number;
383 unsigned char dev_fn = (unsigned char)devfn;
384 unsigned long flags;
385 unsigned long intr;
386 unsigned long value;
387 static char pciirqflag;
388 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
389 unsigned int vpe_status;
390 #endif
391
392 #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
393 if (proc_init == 0) {
394 pci_proc_init();
395 proc_init = ~0;
396 }
397 #endif /* CONFIG_PROC_FS && PCI_COUNTERS */
398
399 /*
400 * Just the first time this function invokes, allocate
401 * an interrupt line for PCI host status interrupts. The
402 * allocation assigns an interrupt handler to the interrupt.
403 */
404 if (pciirqflag == 0) {
405 request_irq(MSP_INT_PCI,/* Hardcoded internal MSP7120 wiring */
406 bpci_interrupt,
407 IRQF_SHARED | IRQF_DISABLED,
408 "PMC MSP PCI Host",
409 preg);
410 pciirqflag = ~0;
411 }
412
413 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
414 local_irq_save(flags);
415 vpe_status = dvpe();
416 #else
417 spin_lock_irqsave(&bpci_lock, flags);
418 #endif
419
420 /*
421 * Clear PCI cause register bits.
422 *
423 * In Polo, the PCI Host had a dedicated DMA called the
424 * Block Copy (not to be confused with the general purpose Block
425 * Copy Engine block). There appear to have been special interrupts
426 * for this Block Copy, called Block Copy 0 Fault (BC0F) and
427 * Block Copy 1 Fault (BC1F). MSP4200 and MSP7120 don't have this
428 * dedicated Block Copy block, so these two interrupts are now
429 * marked reserved. In case the Block Copy is resurrected in a
430 * future design, maintain the code that treats these two interrupts
431 * specially.
432 *
433 * Write to clear all interrupts in the PCI status register, aside
434 * from BC0F and BC1F.
435 */
436 preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
437
438 /* Setup address that is to appear on PCI bus */
439 preg->config_addr = BPCI_CFGADDR_ENABLE |
440 (bus_num << BPCI_CFGADDR_BUSNUM_SHF) |
441 (dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) |
442 (where & 0xFC);
443
444 /* IF access is a PCI configuration write */
445 if (access_type == PCI_ACCESS_WRITE) {
446 value = cpu_to_le32(*data);
447 *PCI_CONFIG_SPACE_REG = value;
448 } else {
449 /* ELSE access is a PCI configuration read */
450 value = le32_to_cpu(*PCI_CONFIG_SPACE_REG);
451 *data = value;
452 }
453
454 /*
455 * Check if the PCI configuration cycle (rd or wr) succeeded, by
456 * checking the status bits for errors like master or target abort.
457 */
458 intr = preg->if_status;
459
460 /* Clear config access */
461 preg->config_addr = 0;
462
463 /* IF error occurred */
464 if (intr & ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F)) {
465 /* Clear status bits */
466 preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
467
468 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
469 evpe(vpe_status);
470 local_irq_restore(flags);
471 #else
472 spin_unlock_irqrestore(&bpci_lock, flags);
473 #endif
474
475 return -1;
476 }
477
478 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
479 evpe(vpe_status);
480 local_irq_restore(flags);
481 #else
482 spin_unlock_irqrestore(&bpci_lock, flags);
483 #endif
484
485 return PCIBIOS_SUCCESSFUL;
486 }
487
488 /*****************************************************************************
489 *
490 * FUNCTION: msp_pcibios_read_config_byte
491 * _________________________________________________________________________
492 *
493 * DESCRIPTION: Read a byte from PCI configuration address spac
494 * Since the hardware can't address 8 bit chunks
495 * directly, read a 32-bit chunk, then mask off extraneous
496 * bits.
497 *
498 * INPUTS bus - structure containing attributes for the PCI bus
499 * that the read is destined for.
500 * devfn - device/function combination that the read is
501 * destined for.
502 * where - register within the Configuration Header space
503 * to access.
504 *
505 * OUTPUTS val - read data
506 *
507 * RETURNS: PCIBIOS_SUCCESSFUL - success
508 * -1 - read access failure
509 *
510 ****************************************************************************/
511 static int
msp_pcibios_read_config_byte(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)512 msp_pcibios_read_config_byte(struct pci_bus *bus,
513 unsigned int devfn,
514 int where,
515 u32 *val)
516 {
517 u32 data = 0;
518
519 /*
520 * If the config access did not complete normally (e.g., underwent
521 * master abort) do the PCI compliant thing, which is to supply an
522 * all ones value.
523 */
524 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
525 where, &data)) {
526 *val = 0xFFFFFFFF;
527 return -1;
528 }
529
530 *val = (data >> ((where & 3) << 3)) & 0x0ff;
531
532 return PCIBIOS_SUCCESSFUL;
533 }
534
535 /*****************************************************************************
536 *
537 * FUNCTION: msp_pcibios_read_config_word
538 * _________________________________________________________________________
539 *
540 * DESCRIPTION: Read a word (16 bits) from PCI configuration address space.
541 * Since the hardware can't address 16 bit chunks
542 * directly, read a 32-bit chunk, then mask off extraneous
543 * bits.
544 *
545 * INPUTS bus - structure containing attributes for the PCI bus
546 * that the read is destined for.
547 * devfn - device/function combination that the read is
548 * destined for.
549 * where - register within the Configuration Header space
550 * to access.
551 *
552 * OUTPUTS val - read data
553 *
554 * RETURNS: PCIBIOS_SUCCESSFUL - success
555 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
556 * -1 - read access failure
557 *
558 ****************************************************************************/
559 static int
msp_pcibios_read_config_word(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)560 msp_pcibios_read_config_word(struct pci_bus *bus,
561 unsigned int devfn,
562 int where,
563 u32 *val)
564 {
565 u32 data = 0;
566
567 /* if (where & 1) */ /* Commented out non-compliant code.
568 * Should allow word access to configuration
569 * registers, with only exception being when
570 * the word access would wrap around into
571 * the next dword.
572 */
573 if ((where & 3) == 3) {
574 *val = 0xFFFFFFFF;
575 return PCIBIOS_BAD_REGISTER_NUMBER;
576 }
577
578 /*
579 * If the config access did not complete normally (e.g., underwent
580 * master abort) do the PCI compliant thing, which is to supply an
581 * all ones value.
582 */
583 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
584 where, &data)) {
585 *val = 0xFFFFFFFF;
586 return -1;
587 }
588
589 *val = (data >> ((where & 3) << 3)) & 0x0ffff;
590
591 return PCIBIOS_SUCCESSFUL;
592 }
593
594 /*****************************************************************************
595 *
596 * FUNCTION: msp_pcibios_read_config_dword
597 * _________________________________________________________________________
598 *
599 * DESCRIPTION: Read a double word (32 bits) from PCI configuration
600 * address space.
601 *
602 * INPUTS bus - structure containing attributes for the PCI bus
603 * that the read is destined for.
604 * devfn - device/function combination that the read is
605 * destined for.
606 * where - register within the Configuration Header space
607 * to access.
608 *
609 * OUTPUTS val - read data
610 *
611 * RETURNS: PCIBIOS_SUCCESSFUL - success
612 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
613 * -1 - read access failure
614 *
615 ****************************************************************************/
616 static int
msp_pcibios_read_config_dword(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)617 msp_pcibios_read_config_dword(struct pci_bus *bus,
618 unsigned int devfn,
619 int where,
620 u32 *val)
621 {
622 u32 data = 0;
623
624 /* Address must be dword aligned. */
625 if (where & 3) {
626 *val = 0xFFFFFFFF;
627 return PCIBIOS_BAD_REGISTER_NUMBER;
628 }
629
630 /*
631 * If the config access did not complete normally (e.g., underwent
632 * master abort) do the PCI compliant thing, which is to supply an
633 * all ones value.
634 */
635 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
636 where, &data)) {
637 *val = 0xFFFFFFFF;
638 return -1;
639 }
640
641 *val = data;
642
643 return PCIBIOS_SUCCESSFUL;
644 }
645
646 /*****************************************************************************
647 *
648 * FUNCTION: msp_pcibios_write_config_byte
649 * _________________________________________________________________________
650 *
651 * DESCRIPTION: Write a byte to PCI configuration address space.
652 * Since the hardware can't address 8 bit chunks
653 * directly, a read-modify-write is performed.
654 *
655 * INPUTS bus - structure containing attributes for the PCI bus
656 * that the write is destined for.
657 * devfn - device/function combination that the write is
658 * destined for.
659 * where - register within the Configuration Header space
660 * to access.
661 * val - value to write
662 *
663 * OUTPUTS none
664 *
665 * RETURNS: PCIBIOS_SUCCESSFUL - success
666 * -1 - write access failure
667 *
668 ****************************************************************************/
669 static int
msp_pcibios_write_config_byte(struct pci_bus * bus,unsigned int devfn,int where,u8 val)670 msp_pcibios_write_config_byte(struct pci_bus *bus,
671 unsigned int devfn,
672 int where,
673 u8 val)
674 {
675 u32 data = 0;
676
677 /* read config space */
678 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
679 where, &data))
680 return -1;
681
682 /* modify the byte within the dword */
683 data = (data & ~(0xff << ((where & 3) << 3))) |
684 (val << ((where & 3) << 3));
685
686 /* write back the full dword */
687 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
688 where, &data))
689 return -1;
690
691 return PCIBIOS_SUCCESSFUL;
692 }
693
694 /*****************************************************************************
695 *
696 * FUNCTION: msp_pcibios_write_config_word
697 * _________________________________________________________________________
698 *
699 * DESCRIPTION: Write a word (16-bits) to PCI configuration address space.
700 * Since the hardware can't address 16 bit chunks
701 * directly, a read-modify-write is performed.
702 *
703 * INPUTS bus - structure containing attributes for the PCI bus
704 * that the write is destined for.
705 * devfn - device/function combination that the write is
706 * destined for.
707 * where - register within the Configuration Header space
708 * to access.
709 * val - value to write
710 *
711 * OUTPUTS none
712 *
713 * RETURNS: PCIBIOS_SUCCESSFUL - success
714 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
715 * -1 - write access failure
716 *
717 ****************************************************************************/
718 static int
msp_pcibios_write_config_word(struct pci_bus * bus,unsigned int devfn,int where,u16 val)719 msp_pcibios_write_config_word(struct pci_bus *bus,
720 unsigned int devfn,
721 int where,
722 u16 val)
723 {
724 u32 data = 0;
725
726 /* Fixed non-compliance: if (where & 1) */
727 if ((where & 3) == 3)
728 return PCIBIOS_BAD_REGISTER_NUMBER;
729
730 /* read config space */
731 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
732 where, &data))
733 return -1;
734
735 /* modify the word within the dword */
736 data = (data & ~(0xffff << ((where & 3) << 3))) |
737 (val << ((where & 3) << 3));
738
739 /* write back the full dword */
740 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
741 where, &data))
742 return -1;
743
744 return PCIBIOS_SUCCESSFUL;
745 }
746
747 /*****************************************************************************
748 *
749 * FUNCTION: msp_pcibios_write_config_dword
750 * _________________________________________________________________________
751 *
752 * DESCRIPTION: Write a double word (32-bits) to PCI configuration address
753 * space.
754 *
755 * INPUTS bus - structure containing attributes for the PCI bus
756 * that the write is destined for.
757 * devfn - device/function combination that the write is
758 * destined for.
759 * where - register within the Configuration Header space
760 * to access.
761 * val - value to write
762 *
763 * OUTPUTS none
764 *
765 * RETURNS: PCIBIOS_SUCCESSFUL - success
766 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
767 * -1 - write access failure
768 *
769 ****************************************************************************/
770 static int
msp_pcibios_write_config_dword(struct pci_bus * bus,unsigned int devfn,int where,u32 val)771 msp_pcibios_write_config_dword(struct pci_bus *bus,
772 unsigned int devfn,
773 int where,
774 u32 val)
775 {
776 /* check that address is dword aligned */
777 if (where & 3)
778 return PCIBIOS_BAD_REGISTER_NUMBER;
779
780 /* perform write */
781 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
782 where, &val))
783 return -1;
784
785 return PCIBIOS_SUCCESSFUL;
786 }
787
788 /*****************************************************************************
789 *
790 * FUNCTION: msp_pcibios_read_config
791 * _________________________________________________________________________
792 *
793 * DESCRIPTION: Interface the PCI configuration read request with
794 * the appropriate function, based on how many bytes
795 * the read request is.
796 *
797 * INPUTS bus - structure containing attributes for the PCI bus
798 * that the write is destined for.
799 * devfn - device/function combination that the write is
800 * destined for.
801 * where - register within the Configuration Header space
802 * to access.
803 * size - in units of bytes, should be 1, 2, or 4.
804 *
805 * OUTPUTS val - value read, with any extraneous bytes masked
806 * to zero.
807 *
808 * RETURNS: PCIBIOS_SUCCESSFUL - success
809 * -1 - failure
810 *
811 ****************************************************************************/
812 int
msp_pcibios_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)813 msp_pcibios_read_config(struct pci_bus *bus,
814 unsigned int devfn,
815 int where,
816 int size,
817 u32 *val)
818 {
819 if (size == 1) {
820 if (msp_pcibios_read_config_byte(bus, devfn, where, val)) {
821 return -1;
822 }
823 } else if (size == 2) {
824 if (msp_pcibios_read_config_word(bus, devfn, where, val)) {
825 return -1;
826 }
827 } else if (size == 4) {
828 if (msp_pcibios_read_config_dword(bus, devfn, where, val)) {
829 return -1;
830 }
831 } else {
832 *val = 0xFFFFFFFF;
833 return -1;
834 }
835
836 return PCIBIOS_SUCCESSFUL;
837 }
838
839 /*****************************************************************************
840 *
841 * FUNCTION: msp_pcibios_write_config
842 * _________________________________________________________________________
843 *
844 * DESCRIPTION: Interface the PCI configuration write request with
845 * the appropriate function, based on how many bytes
846 * the read request is.
847 *
848 * INPUTS bus - structure containing attributes for the PCI bus
849 * that the write is destined for.
850 * devfn - device/function combination that the write is
851 * destined for.
852 * where - register within the Configuration Header space
853 * to access.
854 * size - in units of bytes, should be 1, 2, or 4.
855 * val - value to write
856 *
857 * OUTPUTS: none
858 *
859 * RETURNS: PCIBIOS_SUCCESSFUL - success
860 * -1 - failure
861 *
862 ****************************************************************************/
863 int
msp_pcibios_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)864 msp_pcibios_write_config(struct pci_bus *bus,
865 unsigned int devfn,
866 int where,
867 int size,
868 u32 val)
869 {
870 if (size == 1) {
871 if (msp_pcibios_write_config_byte(bus, devfn,
872 where, (u8)(0xFF & val))) {
873 return -1;
874 }
875 } else if (size == 2) {
876 if (msp_pcibios_write_config_word(bus, devfn,
877 where, (u16)(0xFFFF & val))) {
878 return -1;
879 }
880 } else if (size == 4) {
881 if (msp_pcibios_write_config_dword(bus, devfn, where, val)) {
882 return -1;
883 }
884 } else {
885 return -1;
886 }
887
888 return PCIBIOS_SUCCESSFUL;
889 }
890
891 /*****************************************************************************
892 *
893 * STRUCTURE: msp_pci_ops
894 * _________________________________________________________________________
895 *
896 * DESCRIPTION: structure to abstract the hardware specific PCI
897 * configuration accesses.
898 *
899 * ELEMENTS:
900 * read - function for Linux to generate PCI Configuration reads.
901 * write - function for Linux to generate PCI Configuration writes.
902 *
903 ****************************************************************************/
904 struct pci_ops msp_pci_ops = {
905 .read = msp_pcibios_read_config,
906 .write = msp_pcibios_write_config
907 };
908
909 /*****************************************************************************
910 *
911 * STRUCTURE: msp_pci_controller
912 * _________________________________________________________________________
913 *
914 * Describes the attributes of the MSP7120 PCI Host Controller
915 *
916 * ELEMENTS:
917 * pci_ops - abstracts the hardware specific PCI configuration
918 * accesses.
919 *
920 * mem_resource - address range pciauto() uses to assign to PCI device
921 * memory BARs.
922 *
923 * mem_offset - offset between how MSP7120 outbound PCI memory
924 * transaction addresses appear on the PCI bus and how Linux
925 * wants to configure memory BARs of the PCI devices.
926 * MSP7120 does nothing funky, so just set to zero.
927 *
928 * io_resource - address range pciauto() uses to assign to PCI device
929 * I/O BARs.
930 *
931 * io_offset - offset between how MSP7120 outbound PCI I/O
932 * transaction addresses appear on the PCI bus and how
933 * Linux defaults to configure I/O BARs of the PCI devices.
934 * MSP7120 maps outbound I/O accesses into the bottom
935 * bottom 4K of PCI address space (and ignores OATRAN).
936 * Since the Linux default is to configure I/O BARs to the
937 * bottom 4K, no special offset is needed. Just set to zero.
938 *
939 ****************************************************************************/
940 static struct pci_controller msp_pci_controller = {
941 .pci_ops = &msp_pci_ops,
942 .mem_resource = &pci_mem_resource,
943 .mem_offset = 0,
944 .io_resource = &pci_io_resource,
945 .io_offset = 0
946 };
947
948 /*****************************************************************************
949 *
950 * FUNCTION: msp_pci_init
951 * _________________________________________________________________________
952 *
953 * DESCRIPTION: Initialize the PCI Host Controller and register it with
954 * Linux so Linux can seize control of the PCI bus.
955 *
956 ****************************************************************************/
msp_pci_init(void)957 void __init msp_pci_init(void)
958 {
959 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
960 u32 id;
961
962 /* Extract Device ID */
963 id = read_reg32(PCI_JTAG_DEVID_REG, 0xFFFF) >> 12;
964
965 /* Check if JTAG ID identifies MSP7120 */
966 if (!MSP_HAS_PCI(id)) {
967 printk(KERN_WARNING "PCI: No PCI; id reads as %x\n", id);
968 goto no_pci;
969 }
970
971 /*
972 * Enable flushing of the PCI-SDRAM queue upon a read
973 * of the SDRAM's Memory Configuration Register.
974 */
975 *(unsigned long *)QFLUSH_REG_1 = 3;
976
977 /* Configure PCI Host Controller. */
978 preg->if_status = ~0; /* Clear cause register bits */
979 preg->config_addr = 0; /* Clear config access */
980 preg->oatran = MSP_PCI_OATRAN; /* PCI outbound addr translation */
981 preg->if_mask = 0xF8BF87C0; /* Enable all PCI status interrupts */
982
983 /* configure so inb(), outb(), and family are functional */
984 set_io_port_base(MSP_PCI_IOSPACE_BASE);
985
986 /* Tell Linux the details of the MSP7120 PCI Host Controller */
987 register_pci_controller(&msp_pci_controller);
988
989 return;
990
991 no_pci:
992 /* Disable PCI channel */
993 printk(KERN_WARNING "PCI: no host PCI bus detected\n");
994 }
995