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@linux-m68k.org>
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: show_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: m - synthetic file construction data
64 * v - iterator
65 *
66 * RETURNS: 0 or error
67 *
68 ****************************************************************************/
show_msp_pci_counts(struct seq_file * m,void * v)69 static int show_msp_pci_counts(struct seq_file *m, void *v)
70 {
71 int i;
72 unsigned int intcount, total = 0;
73
74 for (i = 0; i < 32; ++i) {
75 intcount = pci_int_count[i];
76 if (intcount != 0) {
77 seq_printf(m, "[%d] = %u\n", i, intcount);
78 total += intcount;
79 }
80 }
81
82 seq_printf(m, "total = %u\n", total);
83 return 0;
84 }
85
86 /*****************************************************************************
87 *
88 * FUNCTION: gen_pci_cfg_wr_show
89 * _________________________________________________________________________
90 *
91 * DESCRIPTION: Generates a configuration write cycle for debug purposes.
92 * The IDSEL line asserted and location and data written are
93 * immaterial. Just want to be able to prove that a
94 * configuration write can be correctly generated on the
95 * PCI bus. Intent is that this function by invocable from
96 * the /proc filesystem.
97 *
98 * INPUTS: m - synthetic file construction data
99 * v - iterator
100 *
101 * RETURNS: 0 or error
102 *
103 ****************************************************************************/
gen_pci_cfg_wr_show(struct seq_file * m,void * v)104 static int gen_pci_cfg_wr_show(struct seq_file *m, void *v)
105 {
106 unsigned char where = 0; /* Write to static Device/Vendor ID */
107 unsigned char bus_num = 0; /* Bus 0 */
108 unsigned char dev_fn = 0xF; /* Arbitrary device number */
109 u32 wr_data = 0xFF00AA00; /* Arbitrary data */
110 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
111 unsigned long value;
112 int intr;
113
114 seq_puts(m, "PMC MSP PCI: Beginning\n");
115
116 if (proc_init == 0) {
117 pci_proc_init();
118 proc_init = ~0;
119 }
120
121 seq_puts(m, "PMC MSP PCI: Before Cfg Wr\n");
122
123 /*
124 * Generate PCI Configuration Write Cycle
125 */
126
127 /* Clear cause register bits */
128 preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
129
130 /* Setup address that is to appear on PCI bus */
131 preg->config_addr = BPCI_CFGADDR_ENABLE |
132 (bus_num << BPCI_CFGADDR_BUSNUM_SHF) |
133 (dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) |
134 (where & 0xFC);
135
136 value = cpu_to_le32(wr_data);
137
138 /* Launch the PCI configuration write cycle */
139 *PCI_CONFIG_SPACE_REG = value;
140
141 /*
142 * Check if the PCI configuration cycle (rd or wr) succeeded, by
143 * checking the status bits for errors like master or target abort.
144 */
145 intr = preg->if_status;
146
147 seq_puts(m, "PMC MSP PCI: After Cfg Wr\n");
148 return 0;
149 }
150
151 /*****************************************************************************
152 *
153 * FUNCTION: pci_proc_init
154 * _________________________________________________________________________
155 *
156 * DESCRIPTION: Create entries in the /proc filesystem for debug access.
157 *
158 * INPUTS: none
159 *
160 * OUTPUTS: none
161 *
162 * RETURNS: none
163 *
164 ****************************************************************************/
pci_proc_init(void)165 static void pci_proc_init(void)
166 {
167 proc_create_single("pmc_msp_pci_rd_cnt", 0, NULL, show_msp_pci_counts);
168 proc_create_single("pmc_msp_pci_cfg_wr", 0, NULL, gen_pci_cfg_wr_show);
169 }
170 #endif /* CONFIG_PROC_FS && PCI_COUNTERS */
171
172 /*****************************************************************************
173 *
174 * STRUCT: pci_io_resource
175 * _________________________________________________________________________
176 *
177 * DESCRIPTION: Defines the address range that pciauto() will use to
178 * assign to the I/O BARs of PCI devices.
179 *
180 * Use the start and end addresses of the MSP7120 PCI Host
181 * Controller I/O space, in the form that they appear on the
182 * PCI bus AFTER MSP7120 has performed address translation.
183 *
184 * For I/O accesses, MSP7120 ignores OATRAN and maps I/O
185 * accesses into the bottom 0xFFF region of address space,
186 * so that is the range to put into the pci_io_resource
187 * struct.
188 *
189 * In MSP4200, the start address was 0x04 instead of the
190 * expected 0x00. Will just assume there was a good reason
191 * for this!
192 *
193 * NOTES: Linux, by default, will assign I/O space to the lowest
194 * region of address space. Since MSP7120 and Linux,
195 * by default, have no offset in between how they map, the
196 * io_offset element of pci_controller struct should be set
197 * to zero.
198 * ELEMENTS:
199 * name - String used for a meaningful name.
200 *
201 * start - Start address of MSP7120's I/O space, as MSP7120 presents
202 * the address on the PCI bus.
203 *
204 * end - End address of MSP7120's I/O space, as MSP7120 presents
205 * the address on the PCI bus.
206 *
207 * flags - Attributes indicating the type of resource. In this case,
208 * indicate I/O space.
209 *
210 ****************************************************************************/
211 static struct resource pci_io_resource = {
212 .name = "pci IO space",
213 .start = 0x04,
214 .end = 0x0FFF,
215 .flags = IORESOURCE_IO /* I/O space */
216 };
217
218 /*****************************************************************************
219 *
220 * STRUCT: pci_mem_resource
221 * _________________________________________________________________________
222 *
223 * DESCRIPTION: Defines the address range that pciauto() will use to
224 * assign to the memory BARs of PCI devices.
225 *
226 * The .start and .end values are dependent upon how address
227 * translation is performed by the OATRAN regiser.
228 *
229 * The values to use for .start and .end are the values
230 * in the form they appear on the PCI bus AFTER MSP7120 has
231 * performed OATRAN address translation.
232 *
233 * ELEMENTS:
234 * name - String used for a meaningful name.
235 *
236 * start - Start address of MSP7120's memory space, as MSP7120 presents
237 * the address on the PCI bus.
238 *
239 * end - End address of MSP7120's memory space, as MSP7120 presents
240 * the address on the PCI bus.
241 *
242 * flags - Attributes indicating the type of resource. In this case,
243 * indicate memory space.
244 *
245 ****************************************************************************/
246 static struct resource pci_mem_resource = {
247 .name = "pci memory space",
248 .start = MSP_PCI_SPACE_BASE,
249 .end = MSP_PCI_SPACE_END,
250 .flags = IORESOURCE_MEM /* memory space */
251 };
252
253 /*****************************************************************************
254 *
255 * FUNCTION: bpci_interrupt
256 * _________________________________________________________________________
257 *
258 * DESCRIPTION: PCI status interrupt handler. Updates the count of how
259 * many times each status bit has been set, then clears
260 * the status bits. If the appropriate macros are defined,
261 * these counts can be viewed via the /proc filesystem.
262 *
263 * INPUTS: irq - unused
264 * dev_id - unused
265 * pt_regs - unused
266 *
267 * OUTPUTS: none
268 *
269 * RETURNS: PCIBIOS_SUCCESSFUL - success
270 *
271 ****************************************************************************/
bpci_interrupt(int irq,void * dev_id)272 static irqreturn_t bpci_interrupt(int irq, void *dev_id)
273 {
274 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
275 unsigned int stat = preg->if_status;
276
277 #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
278 int i;
279 for (i = 0; i < 32; ++i) {
280 if ((1 << i) & stat)
281 ++pci_int_count[i];
282 }
283 #endif /* PROC_FS && PCI_COUNTERS */
284
285 /* printk("PCI ISR: Status=%08X\n", stat); */
286
287 /* write to clear all asserted interrupts */
288 preg->if_status = stat;
289
290 return IRQ_HANDLED;
291 }
292
293 /*****************************************************************************
294 *
295 * FUNCTION: msp_pcibios_config_access
296 * _________________________________________________________________________
297 *
298 * DESCRIPTION: Performs a PCI configuration access (rd or wr), then
299 * checks that the access succeeded by querying MSP7120's
300 * PCI status bits.
301 *
302 * INPUTS:
303 * access_type - kind of PCI configuration cycle to perform
304 * (read or write). Legal values are
305 * PCI_ACCESS_WRITE and PCI_ACCESS_READ.
306 *
307 * bus - pointer to the bus number of the device to
308 * be targeted for the configuration cycle.
309 * The only element of the pci_bus structure
310 * used is bus->number. This argument determines
311 * if the configuration access will be Type 0 or
312 * Type 1. Since MSP7120 assumes itself to be the
313 * PCI Host, any non-zero bus->number generates
314 * a Type 1 access.
315 *
316 * devfn - this is an 8-bit field. The lower three bits
317 * specify the function number of the device to
318 * be targeted for the configuration cycle, with
319 * all three-bit combinations being legal. The
320 * upper five bits specify the device number,
321 * with legal values being 10 to 31.
322 *
323 * where - address within the Configuration Header
324 * space to access.
325 *
326 * data - for write accesses, contains the data to
327 * write.
328 *
329 * OUTPUTS:
330 * data - for read accesses, contains the value read.
331 *
332 * RETURNS: PCIBIOS_SUCCESSFUL - success
333 * -1 - access failure
334 *
335 ****************************************************************************/
msp_pcibios_config_access(unsigned char access_type,struct pci_bus * bus,unsigned int devfn,unsigned char where,u32 * data)336 int msp_pcibios_config_access(unsigned char access_type,
337 struct pci_bus *bus,
338 unsigned int devfn,
339 unsigned char where,
340 u32 *data)
341 {
342 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
343 unsigned char bus_num = bus->number;
344 unsigned char dev_fn = (unsigned char)devfn;
345 unsigned long intr;
346 unsigned long value;
347 static char pciirqflag;
348 int ret;
349 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
350 unsigned int vpe_status;
351 #endif
352
353 #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
354 if (proc_init == 0) {
355 pci_proc_init();
356 proc_init = ~0;
357 }
358 #endif /* CONFIG_PROC_FS && PCI_COUNTERS */
359
360 /*
361 * Just the first time this function invokes, allocate
362 * an interrupt line for PCI host status interrupts. The
363 * allocation assigns an interrupt handler to the interrupt.
364 */
365 if (pciirqflag == 0) {
366 ret = request_irq(MSP_INT_PCI,/* Hardcoded internal MSP7120 wiring */
367 bpci_interrupt,
368 IRQF_SHARED,
369 "PMC MSP PCI Host",
370 preg);
371 if (ret != 0)
372 return ret;
373 pciirqflag = ~0;
374 }
375
376 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
377 vpe_status = dvpe();
378 #endif
379
380 /*
381 * Clear PCI cause register bits.
382 *
383 * In Polo, the PCI Host had a dedicated DMA called the
384 * Block Copy (not to be confused with the general purpose Block
385 * Copy Engine block). There appear to have been special interrupts
386 * for this Block Copy, called Block Copy 0 Fault (BC0F) and
387 * Block Copy 1 Fault (BC1F). MSP4200 and MSP7120 don't have this
388 * dedicated Block Copy block, so these two interrupts are now
389 * marked reserved. In case the Block Copy is resurrected in a
390 * future design, maintain the code that treats these two interrupts
391 * specially.
392 *
393 * Write to clear all interrupts in the PCI status register, aside
394 * from BC0F and BC1F.
395 */
396 preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
397
398 /* Setup address that is to appear on PCI bus */
399 preg->config_addr = BPCI_CFGADDR_ENABLE |
400 (bus_num << BPCI_CFGADDR_BUSNUM_SHF) |
401 (dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) |
402 (where & 0xFC);
403
404 /* IF access is a PCI configuration write */
405 if (access_type == PCI_ACCESS_WRITE) {
406 value = cpu_to_le32(*data);
407 *PCI_CONFIG_SPACE_REG = value;
408 } else {
409 /* ELSE access is a PCI configuration read */
410 value = le32_to_cpu(*PCI_CONFIG_SPACE_REG);
411 *data = value;
412 }
413
414 /*
415 * Check if the PCI configuration cycle (rd or wr) succeeded, by
416 * checking the status bits for errors like master or target abort.
417 */
418 intr = preg->if_status;
419
420 /* Clear config access */
421 preg->config_addr = 0;
422
423 /* IF error occurred */
424 if (intr & ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F)) {
425 /* Clear status bits */
426 preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
427
428 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
429 evpe(vpe_status);
430 #endif
431
432 return -1;
433 }
434
435 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
436 evpe(vpe_status);
437 #endif
438
439 return PCIBIOS_SUCCESSFUL;
440 }
441
442 /*****************************************************************************
443 *
444 * FUNCTION: msp_pcibios_read_config_byte
445 * _________________________________________________________________________
446 *
447 * DESCRIPTION: Read a byte from PCI configuration address spac
448 * Since the hardware can't address 8 bit chunks
449 * directly, read a 32-bit chunk, then mask off extraneous
450 * bits.
451 *
452 * INPUTS bus - structure containing attributes for the PCI bus
453 * that the read is destined for.
454 * devfn - device/function combination that the read is
455 * destined for.
456 * where - register within the Configuration Header space
457 * to access.
458 *
459 * OUTPUTS val - read data
460 *
461 * RETURNS: PCIBIOS_SUCCESSFUL - success
462 * -1 - read access failure
463 *
464 ****************************************************************************/
465 static int
msp_pcibios_read_config_byte(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)466 msp_pcibios_read_config_byte(struct pci_bus *bus,
467 unsigned int devfn,
468 int where,
469 u32 *val)
470 {
471 u32 data = 0;
472
473 /*
474 * If the config access did not complete normally (e.g., underwent
475 * master abort) do the PCI compliant thing, which is to supply an
476 * all ones value.
477 */
478 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
479 where, &data)) {
480 *val = 0xFFFFFFFF;
481 return -1;
482 }
483
484 *val = (data >> ((where & 3) << 3)) & 0x0ff;
485
486 return PCIBIOS_SUCCESSFUL;
487 }
488
489 /*****************************************************************************
490 *
491 * FUNCTION: msp_pcibios_read_config_word
492 * _________________________________________________________________________
493 *
494 * DESCRIPTION: Read a word (16 bits) from PCI configuration address space.
495 * Since the hardware can't address 16 bit chunks
496 * directly, read a 32-bit chunk, then mask off extraneous
497 * bits.
498 *
499 * INPUTS bus - structure containing attributes for the PCI bus
500 * that the read is destined for.
501 * devfn - device/function combination that the read is
502 * destined for.
503 * where - register within the Configuration Header space
504 * to access.
505 *
506 * OUTPUTS val - read data
507 *
508 * RETURNS: PCIBIOS_SUCCESSFUL - success
509 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
510 * -1 - read access failure
511 *
512 ****************************************************************************/
513 static int
msp_pcibios_read_config_word(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)514 msp_pcibios_read_config_word(struct pci_bus *bus,
515 unsigned int devfn,
516 int where,
517 u32 *val)
518 {
519 u32 data = 0;
520
521 /* if (where & 1) */ /* Commented out non-compliant code.
522 * Should allow word access to configuration
523 * registers, with only exception being when
524 * the word access would wrap around into
525 * the next dword.
526 */
527 if ((where & 3) == 3) {
528 *val = 0xFFFFFFFF;
529 return PCIBIOS_BAD_REGISTER_NUMBER;
530 }
531
532 /*
533 * If the config access did not complete normally (e.g., underwent
534 * master abort) do the PCI compliant thing, which is to supply an
535 * all ones value.
536 */
537 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
538 where, &data)) {
539 *val = 0xFFFFFFFF;
540 return -1;
541 }
542
543 *val = (data >> ((where & 3) << 3)) & 0x0ffff;
544
545 return PCIBIOS_SUCCESSFUL;
546 }
547
548 /*****************************************************************************
549 *
550 * FUNCTION: msp_pcibios_read_config_dword
551 * _________________________________________________________________________
552 *
553 * DESCRIPTION: Read a double word (32 bits) from PCI configuration
554 * address space.
555 *
556 * INPUTS bus - structure containing attributes for the PCI bus
557 * that the read is destined for.
558 * devfn - device/function combination that the read is
559 * destined for.
560 * where - register within the Configuration Header space
561 * to access.
562 *
563 * OUTPUTS val - read data
564 *
565 * RETURNS: PCIBIOS_SUCCESSFUL - success
566 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
567 * -1 - read access failure
568 *
569 ****************************************************************************/
570 static int
msp_pcibios_read_config_dword(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)571 msp_pcibios_read_config_dword(struct pci_bus *bus,
572 unsigned int devfn,
573 int where,
574 u32 *val)
575 {
576 u32 data = 0;
577
578 /* Address must be dword aligned. */
579 if (where & 3) {
580 *val = 0xFFFFFFFF;
581 return PCIBIOS_BAD_REGISTER_NUMBER;
582 }
583
584 /*
585 * If the config access did not complete normally (e.g., underwent
586 * master abort) do the PCI compliant thing, which is to supply an
587 * all ones value.
588 */
589 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
590 where, &data)) {
591 *val = 0xFFFFFFFF;
592 return -1;
593 }
594
595 *val = data;
596
597 return PCIBIOS_SUCCESSFUL;
598 }
599
600 /*****************************************************************************
601 *
602 * FUNCTION: msp_pcibios_write_config_byte
603 * _________________________________________________________________________
604 *
605 * DESCRIPTION: Write a byte to PCI configuration address space.
606 * Since the hardware can't address 8 bit chunks
607 * directly, a read-modify-write is performed.
608 *
609 * INPUTS bus - structure containing attributes for the PCI bus
610 * that the write is destined for.
611 * devfn - device/function combination that the write is
612 * destined for.
613 * where - register within the Configuration Header space
614 * to access.
615 * val - value to write
616 *
617 * OUTPUTS none
618 *
619 * RETURNS: PCIBIOS_SUCCESSFUL - success
620 * -1 - write access failure
621 *
622 ****************************************************************************/
623 static int
msp_pcibios_write_config_byte(struct pci_bus * bus,unsigned int devfn,int where,u8 val)624 msp_pcibios_write_config_byte(struct pci_bus *bus,
625 unsigned int devfn,
626 int where,
627 u8 val)
628 {
629 u32 data = 0;
630
631 /* read config space */
632 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
633 where, &data))
634 return -1;
635
636 /* modify the byte within the dword */
637 data = (data & ~(0xff << ((where & 3) << 3))) |
638 (val << ((where & 3) << 3));
639
640 /* write back the full dword */
641 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
642 where, &data))
643 return -1;
644
645 return PCIBIOS_SUCCESSFUL;
646 }
647
648 /*****************************************************************************
649 *
650 * FUNCTION: msp_pcibios_write_config_word
651 * _________________________________________________________________________
652 *
653 * DESCRIPTION: Write a word (16-bits) to PCI configuration address space.
654 * Since the hardware can't address 16 bit chunks
655 * directly, a read-modify-write is performed.
656 *
657 * INPUTS bus - structure containing attributes for the PCI bus
658 * that the write is destined for.
659 * devfn - device/function combination that the write is
660 * destined for.
661 * where - register within the Configuration Header space
662 * to access.
663 * val - value to write
664 *
665 * OUTPUTS none
666 *
667 * RETURNS: PCIBIOS_SUCCESSFUL - success
668 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
669 * -1 - write access failure
670 *
671 ****************************************************************************/
672 static int
msp_pcibios_write_config_word(struct pci_bus * bus,unsigned int devfn,int where,u16 val)673 msp_pcibios_write_config_word(struct pci_bus *bus,
674 unsigned int devfn,
675 int where,
676 u16 val)
677 {
678 u32 data = 0;
679
680 /* Fixed non-compliance: if (where & 1) */
681 if ((where & 3) == 3)
682 return PCIBIOS_BAD_REGISTER_NUMBER;
683
684 /* read config space */
685 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
686 where, &data))
687 return -1;
688
689 /* modify the word within the dword */
690 data = (data & ~(0xffff << ((where & 3) << 3))) |
691 (val << ((where & 3) << 3));
692
693 /* write back the full dword */
694 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
695 where, &data))
696 return -1;
697
698 return PCIBIOS_SUCCESSFUL;
699 }
700
701 /*****************************************************************************
702 *
703 * FUNCTION: msp_pcibios_write_config_dword
704 * _________________________________________________________________________
705 *
706 * DESCRIPTION: Write a double word (32-bits) to PCI configuration address
707 * space.
708 *
709 * INPUTS bus - structure containing attributes for the PCI bus
710 * that the write is destined for.
711 * devfn - device/function combination that the write is
712 * destined for.
713 * where - register within the Configuration Header space
714 * to access.
715 * val - value to write
716 *
717 * OUTPUTS none
718 *
719 * RETURNS: PCIBIOS_SUCCESSFUL - success
720 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
721 * -1 - write access failure
722 *
723 ****************************************************************************/
724 static int
msp_pcibios_write_config_dword(struct pci_bus * bus,unsigned int devfn,int where,u32 val)725 msp_pcibios_write_config_dword(struct pci_bus *bus,
726 unsigned int devfn,
727 int where,
728 u32 val)
729 {
730 /* check that address is dword aligned */
731 if (where & 3)
732 return PCIBIOS_BAD_REGISTER_NUMBER;
733
734 /* perform write */
735 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
736 where, &val))
737 return -1;
738
739 return PCIBIOS_SUCCESSFUL;
740 }
741
742 /*****************************************************************************
743 *
744 * FUNCTION: msp_pcibios_read_config
745 * _________________________________________________________________________
746 *
747 * DESCRIPTION: Interface the PCI configuration read request with
748 * the appropriate function, based on how many bytes
749 * the read request is.
750 *
751 * INPUTS bus - structure containing attributes for the PCI bus
752 * that the write is destined for.
753 * devfn - device/function combination that the write is
754 * destined for.
755 * where - register within the Configuration Header space
756 * to access.
757 * size - in units of bytes, should be 1, 2, or 4.
758 *
759 * OUTPUTS val - value read, with any extraneous bytes masked
760 * to zero.
761 *
762 * RETURNS: PCIBIOS_SUCCESSFUL - success
763 * -1 - failure
764 *
765 ****************************************************************************/
766 int
msp_pcibios_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)767 msp_pcibios_read_config(struct pci_bus *bus,
768 unsigned int devfn,
769 int where,
770 int size,
771 u32 *val)
772 {
773 if (size == 1) {
774 if (msp_pcibios_read_config_byte(bus, devfn, where, val)) {
775 return -1;
776 }
777 } else if (size == 2) {
778 if (msp_pcibios_read_config_word(bus, devfn, where, val)) {
779 return -1;
780 }
781 } else if (size == 4) {
782 if (msp_pcibios_read_config_dword(bus, devfn, where, val)) {
783 return -1;
784 }
785 } else {
786 *val = 0xFFFFFFFF;
787 return -1;
788 }
789
790 return PCIBIOS_SUCCESSFUL;
791 }
792
793 /*****************************************************************************
794 *
795 * FUNCTION: msp_pcibios_write_config
796 * _________________________________________________________________________
797 *
798 * DESCRIPTION: Interface the PCI configuration write request with
799 * the appropriate function, based on how many bytes
800 * the read request is.
801 *
802 * INPUTS bus - structure containing attributes for the PCI bus
803 * that the write is destined for.
804 * devfn - device/function combination that the write is
805 * destined for.
806 * where - register within the Configuration Header space
807 * to access.
808 * size - in units of bytes, should be 1, 2, or 4.
809 * val - value to write
810 *
811 * OUTPUTS: none
812 *
813 * RETURNS: PCIBIOS_SUCCESSFUL - success
814 * -1 - failure
815 *
816 ****************************************************************************/
817 int
msp_pcibios_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)818 msp_pcibios_write_config(struct pci_bus *bus,
819 unsigned int devfn,
820 int where,
821 int size,
822 u32 val)
823 {
824 if (size == 1) {
825 if (msp_pcibios_write_config_byte(bus, devfn,
826 where, (u8)(0xFF & val))) {
827 return -1;
828 }
829 } else if (size == 2) {
830 if (msp_pcibios_write_config_word(bus, devfn,
831 where, (u16)(0xFFFF & val))) {
832 return -1;
833 }
834 } else if (size == 4) {
835 if (msp_pcibios_write_config_dword(bus, devfn, where, val)) {
836 return -1;
837 }
838 } else {
839 return -1;
840 }
841
842 return PCIBIOS_SUCCESSFUL;
843 }
844
845 /*****************************************************************************
846 *
847 * STRUCTURE: msp_pci_ops
848 * _________________________________________________________________________
849 *
850 * DESCRIPTION: structure to abstract the hardware specific PCI
851 * configuration accesses.
852 *
853 * ELEMENTS:
854 * read - function for Linux to generate PCI Configuration reads.
855 * write - function for Linux to generate PCI Configuration writes.
856 *
857 ****************************************************************************/
858 struct pci_ops msp_pci_ops = {
859 .read = msp_pcibios_read_config,
860 .write = msp_pcibios_write_config
861 };
862
863 /*****************************************************************************
864 *
865 * STRUCTURE: msp_pci_controller
866 * _________________________________________________________________________
867 *
868 * Describes the attributes of the MSP7120 PCI Host Controller
869 *
870 * ELEMENTS:
871 * pci_ops - abstracts the hardware specific PCI configuration
872 * accesses.
873 *
874 * mem_resource - address range pciauto() uses to assign to PCI device
875 * memory BARs.
876 *
877 * mem_offset - offset between how MSP7120 outbound PCI memory
878 * transaction addresses appear on the PCI bus and how Linux
879 * wants to configure memory BARs of the PCI devices.
880 * MSP7120 does nothing funky, so just set to zero.
881 *
882 * io_resource - address range pciauto() uses to assign to PCI device
883 * I/O BARs.
884 *
885 * io_offset - offset between how MSP7120 outbound PCI I/O
886 * transaction addresses appear on the PCI bus and how
887 * Linux defaults to configure I/O BARs of the PCI devices.
888 * MSP7120 maps outbound I/O accesses into the bottom
889 * bottom 4K of PCI address space (and ignores OATRAN).
890 * Since the Linux default is to configure I/O BARs to the
891 * bottom 4K, no special offset is needed. Just set to zero.
892 *
893 ****************************************************************************/
894 static struct pci_controller msp_pci_controller = {
895 .pci_ops = &msp_pci_ops,
896 .mem_resource = &pci_mem_resource,
897 .mem_offset = 0,
898 .io_map_base = MSP_PCI_IOSPACE_BASE,
899 .io_resource = &pci_io_resource,
900 .io_offset = 0
901 };
902
903 /*****************************************************************************
904 *
905 * FUNCTION: msp_pci_init
906 * _________________________________________________________________________
907 *
908 * DESCRIPTION: Initialize the PCI Host Controller and register it with
909 * Linux so Linux can seize control of the PCI bus.
910 *
911 ****************************************************************************/
msp_pci_init(void)912 void __init msp_pci_init(void)
913 {
914 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
915 u32 id;
916
917 /* Extract Device ID */
918 id = read_reg32(PCI_JTAG_DEVID_REG, 0xFFFF) >> 12;
919
920 /* Check if JTAG ID identifies MSP7120 */
921 if (!MSP_HAS_PCI(id)) {
922 printk(KERN_WARNING "PCI: No PCI; id reads as %x\n", id);
923 goto no_pci;
924 }
925
926 /*
927 * Enable flushing of the PCI-SDRAM queue upon a read
928 * of the SDRAM's Memory Configuration Register.
929 */
930 *(unsigned long *)QFLUSH_REG_1 = 3;
931
932 /* Configure PCI Host Controller. */
933 preg->if_status = ~0; /* Clear cause register bits */
934 preg->config_addr = 0; /* Clear config access */
935 preg->oatran = MSP_PCI_OATRAN; /* PCI outbound addr translation */
936 preg->if_mask = 0xF8BF87C0; /* Enable all PCI status interrupts */
937
938 /* configure so inb(), outb(), and family are functional */
939 set_io_port_base(MSP_PCI_IOSPACE_BASE);
940
941 /* Tell Linux the details of the MSP7120 PCI Host Controller */
942 register_pci_controller(&msp_pci_controller);
943
944 return;
945
946 no_pci:
947 /* Disable PCI channel */
948 printk(KERN_WARNING "PCI: no host PCI bus detected\n");
949 }
950
