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 static 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 irqreturn_t 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 IRQ_HANDLED;
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 targeted 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 targeted 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 int ret;
389 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
390 unsigned int vpe_status;
391 #endif
392
393 #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS)
394 if (proc_init == 0) {
395 pci_proc_init();
396 proc_init = ~0;
397 }
398 #endif /* CONFIG_PROC_FS && PCI_COUNTERS */
399
400 /*
401 * Just the first time this function invokes, allocate
402 * an interrupt line for PCI host status interrupts. The
403 * allocation assigns an interrupt handler to the interrupt.
404 */
405 if (pciirqflag == 0) {
406 ret = request_irq(MSP_INT_PCI,/* Hardcoded internal MSP7120 wiring */
407 bpci_interrupt,
408 IRQF_SHARED,
409 "PMC MSP PCI Host",
410 preg);
411 if (ret != 0)
412 return ret;
413 pciirqflag = ~0;
414 }
415
416 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
417 local_irq_save(flags);
418 vpe_status = dvpe();
419 #else
420 spin_lock_irqsave(&bpci_lock, flags);
421 #endif
422
423 /*
424 * Clear PCI cause register bits.
425 *
426 * In Polo, the PCI Host had a dedicated DMA called the
427 * Block Copy (not to be confused with the general purpose Block
428 * Copy Engine block). There appear to have been special interrupts
429 * for this Block Copy, called Block Copy 0 Fault (BC0F) and
430 * Block Copy 1 Fault (BC1F). MSP4200 and MSP7120 don't have this
431 * dedicated Block Copy block, so these two interrupts are now
432 * marked reserved. In case the Block Copy is resurrected in a
433 * future design, maintain the code that treats these two interrupts
434 * specially.
435 *
436 * Write to clear all interrupts in the PCI status register, aside
437 * from BC0F and BC1F.
438 */
439 preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
440
441 /* Setup address that is to appear on PCI bus */
442 preg->config_addr = BPCI_CFGADDR_ENABLE |
443 (bus_num << BPCI_CFGADDR_BUSNUM_SHF) |
444 (dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) |
445 (where & 0xFC);
446
447 /* IF access is a PCI configuration write */
448 if (access_type == PCI_ACCESS_WRITE) {
449 value = cpu_to_le32(*data);
450 *PCI_CONFIG_SPACE_REG = value;
451 } else {
452 /* ELSE access is a PCI configuration read */
453 value = le32_to_cpu(*PCI_CONFIG_SPACE_REG);
454 *data = value;
455 }
456
457 /*
458 * Check if the PCI configuration cycle (rd or wr) succeeded, by
459 * checking the status bits for errors like master or target abort.
460 */
461 intr = preg->if_status;
462
463 /* Clear config access */
464 preg->config_addr = 0;
465
466 /* IF error occurred */
467 if (intr & ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F)) {
468 /* Clear status bits */
469 preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F);
470
471 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
472 evpe(vpe_status);
473 local_irq_restore(flags);
474 #else
475 spin_unlock_irqrestore(&bpci_lock, flags);
476 #endif
477
478 return -1;
479 }
480
481 #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL)
482 evpe(vpe_status);
483 local_irq_restore(flags);
484 #else
485 spin_unlock_irqrestore(&bpci_lock, flags);
486 #endif
487
488 return PCIBIOS_SUCCESSFUL;
489 }
490
491 /*****************************************************************************
492 *
493 * FUNCTION: msp_pcibios_read_config_byte
494 * _________________________________________________________________________
495 *
496 * DESCRIPTION: Read a byte from PCI configuration address spac
497 * Since the hardware can't address 8 bit chunks
498 * directly, read a 32-bit chunk, then mask off extraneous
499 * bits.
500 *
501 * INPUTS bus - structure containing attributes for the PCI bus
502 * that the read is destined for.
503 * devfn - device/function combination that the read is
504 * destined for.
505 * where - register within the Configuration Header space
506 * to access.
507 *
508 * OUTPUTS val - read data
509 *
510 * RETURNS: PCIBIOS_SUCCESSFUL - success
511 * -1 - read access failure
512 *
513 ****************************************************************************/
514 static int
msp_pcibios_read_config_byte(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)515 msp_pcibios_read_config_byte(struct pci_bus *bus,
516 unsigned int devfn,
517 int where,
518 u32 *val)
519 {
520 u32 data = 0;
521
522 /*
523 * If the config access did not complete normally (e.g., underwent
524 * master abort) do the PCI compliant thing, which is to supply an
525 * all ones value.
526 */
527 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
528 where, &data)) {
529 *val = 0xFFFFFFFF;
530 return -1;
531 }
532
533 *val = (data >> ((where & 3) << 3)) & 0x0ff;
534
535 return PCIBIOS_SUCCESSFUL;
536 }
537
538 /*****************************************************************************
539 *
540 * FUNCTION: msp_pcibios_read_config_word
541 * _________________________________________________________________________
542 *
543 * DESCRIPTION: Read a word (16 bits) from PCI configuration address space.
544 * Since the hardware can't address 16 bit chunks
545 * directly, read a 32-bit chunk, then mask off extraneous
546 * bits.
547 *
548 * INPUTS bus - structure containing attributes for the PCI bus
549 * that the read is destined for.
550 * devfn - device/function combination that the read is
551 * destined for.
552 * where - register within the Configuration Header space
553 * to access.
554 *
555 * OUTPUTS val - read data
556 *
557 * RETURNS: PCIBIOS_SUCCESSFUL - success
558 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
559 * -1 - read access failure
560 *
561 ****************************************************************************/
562 static int
msp_pcibios_read_config_word(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)563 msp_pcibios_read_config_word(struct pci_bus *bus,
564 unsigned int devfn,
565 int where,
566 u32 *val)
567 {
568 u32 data = 0;
569
570 /* if (where & 1) */ /* Commented out non-compliant code.
571 * Should allow word access to configuration
572 * registers, with only exception being when
573 * the word access would wrap around into
574 * the next dword.
575 */
576 if ((where & 3) == 3) {
577 *val = 0xFFFFFFFF;
578 return PCIBIOS_BAD_REGISTER_NUMBER;
579 }
580
581 /*
582 * If the config access did not complete normally (e.g., underwent
583 * master abort) do the PCI compliant thing, which is to supply an
584 * all ones value.
585 */
586 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
587 where, &data)) {
588 *val = 0xFFFFFFFF;
589 return -1;
590 }
591
592 *val = (data >> ((where & 3) << 3)) & 0x0ffff;
593
594 return PCIBIOS_SUCCESSFUL;
595 }
596
597 /*****************************************************************************
598 *
599 * FUNCTION: msp_pcibios_read_config_dword
600 * _________________________________________________________________________
601 *
602 * DESCRIPTION: Read a double word (32 bits) from PCI configuration
603 * address space.
604 *
605 * INPUTS bus - structure containing attributes for the PCI bus
606 * that the read is destined for.
607 * devfn - device/function combination that the read is
608 * destined for.
609 * where - register within the Configuration Header space
610 * to access.
611 *
612 * OUTPUTS val - read data
613 *
614 * RETURNS: PCIBIOS_SUCCESSFUL - success
615 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
616 * -1 - read access failure
617 *
618 ****************************************************************************/
619 static int
msp_pcibios_read_config_dword(struct pci_bus * bus,unsigned int devfn,int where,u32 * val)620 msp_pcibios_read_config_dword(struct pci_bus *bus,
621 unsigned int devfn,
622 int where,
623 u32 *val)
624 {
625 u32 data = 0;
626
627 /* Address must be dword aligned. */
628 if (where & 3) {
629 *val = 0xFFFFFFFF;
630 return PCIBIOS_BAD_REGISTER_NUMBER;
631 }
632
633 /*
634 * If the config access did not complete normally (e.g., underwent
635 * master abort) do the PCI compliant thing, which is to supply an
636 * all ones value.
637 */
638 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
639 where, &data)) {
640 *val = 0xFFFFFFFF;
641 return -1;
642 }
643
644 *val = data;
645
646 return PCIBIOS_SUCCESSFUL;
647 }
648
649 /*****************************************************************************
650 *
651 * FUNCTION: msp_pcibios_write_config_byte
652 * _________________________________________________________________________
653 *
654 * DESCRIPTION: Write a byte to PCI configuration address space.
655 * Since the hardware can't address 8 bit chunks
656 * directly, a read-modify-write is performed.
657 *
658 * INPUTS bus - structure containing attributes for the PCI bus
659 * that the write is destined for.
660 * devfn - device/function combination that the write is
661 * destined for.
662 * where - register within the Configuration Header space
663 * to access.
664 * val - value to write
665 *
666 * OUTPUTS none
667 *
668 * RETURNS: PCIBIOS_SUCCESSFUL - success
669 * -1 - write access failure
670 *
671 ****************************************************************************/
672 static int
msp_pcibios_write_config_byte(struct pci_bus * bus,unsigned int devfn,int where,u8 val)673 msp_pcibios_write_config_byte(struct pci_bus *bus,
674 unsigned int devfn,
675 int where,
676 u8 val)
677 {
678 u32 data = 0;
679
680 /* read config space */
681 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
682 where, &data))
683 return -1;
684
685 /* modify the byte within the dword */
686 data = (data & ~(0xff << ((where & 3) << 3))) |
687 (val << ((where & 3) << 3));
688
689 /* write back the full dword */
690 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
691 where, &data))
692 return -1;
693
694 return PCIBIOS_SUCCESSFUL;
695 }
696
697 /*****************************************************************************
698 *
699 * FUNCTION: msp_pcibios_write_config_word
700 * _________________________________________________________________________
701 *
702 * DESCRIPTION: Write a word (16-bits) to PCI configuration address space.
703 * Since the hardware can't address 16 bit chunks
704 * directly, a read-modify-write is performed.
705 *
706 * INPUTS bus - structure containing attributes for the PCI bus
707 * that the write is destined for.
708 * devfn - device/function combination that the write is
709 * destined for.
710 * where - register within the Configuration Header space
711 * to access.
712 * val - value to write
713 *
714 * OUTPUTS none
715 *
716 * RETURNS: PCIBIOS_SUCCESSFUL - success
717 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
718 * -1 - write access failure
719 *
720 ****************************************************************************/
721 static int
msp_pcibios_write_config_word(struct pci_bus * bus,unsigned int devfn,int where,u16 val)722 msp_pcibios_write_config_word(struct pci_bus *bus,
723 unsigned int devfn,
724 int where,
725 u16 val)
726 {
727 u32 data = 0;
728
729 /* Fixed non-compliance: if (where & 1) */
730 if ((where & 3) == 3)
731 return PCIBIOS_BAD_REGISTER_NUMBER;
732
733 /* read config space */
734 if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
735 where, &data))
736 return -1;
737
738 /* modify the word within the dword */
739 data = (data & ~(0xffff << ((where & 3) << 3))) |
740 (val << ((where & 3) << 3));
741
742 /* write back the full dword */
743 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
744 where, &data))
745 return -1;
746
747 return PCIBIOS_SUCCESSFUL;
748 }
749
750 /*****************************************************************************
751 *
752 * FUNCTION: msp_pcibios_write_config_dword
753 * _________________________________________________________________________
754 *
755 * DESCRIPTION: Write a double word (32-bits) to PCI configuration address
756 * space.
757 *
758 * INPUTS bus - structure containing attributes for the PCI bus
759 * that the write is destined for.
760 * devfn - device/function combination that the write is
761 * destined for.
762 * where - register within the Configuration Header space
763 * to access.
764 * val - value to write
765 *
766 * OUTPUTS none
767 *
768 * RETURNS: PCIBIOS_SUCCESSFUL - success
769 * PCIBIOS_BAD_REGISTER_NUMBER - bad register address
770 * -1 - write access failure
771 *
772 ****************************************************************************/
773 static int
msp_pcibios_write_config_dword(struct pci_bus * bus,unsigned int devfn,int where,u32 val)774 msp_pcibios_write_config_dword(struct pci_bus *bus,
775 unsigned int devfn,
776 int where,
777 u32 val)
778 {
779 /* check that address is dword aligned */
780 if (where & 3)
781 return PCIBIOS_BAD_REGISTER_NUMBER;
782
783 /* perform write */
784 if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn,
785 where, &val))
786 return -1;
787
788 return PCIBIOS_SUCCESSFUL;
789 }
790
791 /*****************************************************************************
792 *
793 * FUNCTION: msp_pcibios_read_config
794 * _________________________________________________________________________
795 *
796 * DESCRIPTION: Interface the PCI configuration read request with
797 * the appropriate function, based on how many bytes
798 * the read request is.
799 *
800 * INPUTS bus - structure containing attributes for the PCI bus
801 * that the write is destined for.
802 * devfn - device/function combination that the write is
803 * destined for.
804 * where - register within the Configuration Header space
805 * to access.
806 * size - in units of bytes, should be 1, 2, or 4.
807 *
808 * OUTPUTS val - value read, with any extraneous bytes masked
809 * to zero.
810 *
811 * RETURNS: PCIBIOS_SUCCESSFUL - success
812 * -1 - failure
813 *
814 ****************************************************************************/
815 int
msp_pcibios_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)816 msp_pcibios_read_config(struct pci_bus *bus,
817 unsigned int devfn,
818 int where,
819 int size,
820 u32 *val)
821 {
822 if (size == 1) {
823 if (msp_pcibios_read_config_byte(bus, devfn, where, val)) {
824 return -1;
825 }
826 } else if (size == 2) {
827 if (msp_pcibios_read_config_word(bus, devfn, where, val)) {
828 return -1;
829 }
830 } else if (size == 4) {
831 if (msp_pcibios_read_config_dword(bus, devfn, where, val)) {
832 return -1;
833 }
834 } else {
835 *val = 0xFFFFFFFF;
836 return -1;
837 }
838
839 return PCIBIOS_SUCCESSFUL;
840 }
841
842 /*****************************************************************************
843 *
844 * FUNCTION: msp_pcibios_write_config
845 * _________________________________________________________________________
846 *
847 * DESCRIPTION: Interface the PCI configuration write request with
848 * the appropriate function, based on how many bytes
849 * the read request is.
850 *
851 * INPUTS bus - structure containing attributes for the PCI bus
852 * that the write is destined for.
853 * devfn - device/function combination that the write is
854 * destined for.
855 * where - register within the Configuration Header space
856 * to access.
857 * size - in units of bytes, should be 1, 2, or 4.
858 * val - value to write
859 *
860 * OUTPUTS: none
861 *
862 * RETURNS: PCIBIOS_SUCCESSFUL - success
863 * -1 - failure
864 *
865 ****************************************************************************/
866 int
msp_pcibios_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)867 msp_pcibios_write_config(struct pci_bus *bus,
868 unsigned int devfn,
869 int where,
870 int size,
871 u32 val)
872 {
873 if (size == 1) {
874 if (msp_pcibios_write_config_byte(bus, devfn,
875 where, (u8)(0xFF & val))) {
876 return -1;
877 }
878 } else if (size == 2) {
879 if (msp_pcibios_write_config_word(bus, devfn,
880 where, (u16)(0xFFFF & val))) {
881 return -1;
882 }
883 } else if (size == 4) {
884 if (msp_pcibios_write_config_dword(bus, devfn, where, val)) {
885 return -1;
886 }
887 } else {
888 return -1;
889 }
890
891 return PCIBIOS_SUCCESSFUL;
892 }
893
894 /*****************************************************************************
895 *
896 * STRUCTURE: msp_pci_ops
897 * _________________________________________________________________________
898 *
899 * DESCRIPTION: structure to abstract the hardware specific PCI
900 * configuration accesses.
901 *
902 * ELEMENTS:
903 * read - function for Linux to generate PCI Configuration reads.
904 * write - function for Linux to generate PCI Configuration writes.
905 *
906 ****************************************************************************/
907 struct pci_ops msp_pci_ops = {
908 .read = msp_pcibios_read_config,
909 .write = msp_pcibios_write_config
910 };
911
912 /*****************************************************************************
913 *
914 * STRUCTURE: msp_pci_controller
915 * _________________________________________________________________________
916 *
917 * Describes the attributes of the MSP7120 PCI Host Controller
918 *
919 * ELEMENTS:
920 * pci_ops - abstracts the hardware specific PCI configuration
921 * accesses.
922 *
923 * mem_resource - address range pciauto() uses to assign to PCI device
924 * memory BARs.
925 *
926 * mem_offset - offset between how MSP7120 outbound PCI memory
927 * transaction addresses appear on the PCI bus and how Linux
928 * wants to configure memory BARs of the PCI devices.
929 * MSP7120 does nothing funky, so just set to zero.
930 *
931 * io_resource - address range pciauto() uses to assign to PCI device
932 * I/O BARs.
933 *
934 * io_offset - offset between how MSP7120 outbound PCI I/O
935 * transaction addresses appear on the PCI bus and how
936 * Linux defaults to configure I/O BARs of the PCI devices.
937 * MSP7120 maps outbound I/O accesses into the bottom
938 * bottom 4K of PCI address space (and ignores OATRAN).
939 * Since the Linux default is to configure I/O BARs to the
940 * bottom 4K, no special offset is needed. Just set to zero.
941 *
942 ****************************************************************************/
943 static struct pci_controller msp_pci_controller = {
944 .pci_ops = &msp_pci_ops,
945 .mem_resource = &pci_mem_resource,
946 .mem_offset = 0,
947 .io_map_base = MSP_PCI_IOSPACE_BASE,
948 .io_resource = &pci_io_resource,
949 .io_offset = 0
950 };
951
952 /*****************************************************************************
953 *
954 * FUNCTION: msp_pci_init
955 * _________________________________________________________________________
956 *
957 * DESCRIPTION: Initialize the PCI Host Controller and register it with
958 * Linux so Linux can seize control of the PCI bus.
959 *
960 ****************************************************************************/
msp_pci_init(void)961 void __init msp_pci_init(void)
962 {
963 struct msp_pci_regs *preg = (void *)PCI_BASE_REG;
964 u32 id;
965
966 /* Extract Device ID */
967 id = read_reg32(PCI_JTAG_DEVID_REG, 0xFFFF) >> 12;
968
969 /* Check if JTAG ID identifies MSP7120 */
970 if (!MSP_HAS_PCI(id)) {
971 printk(KERN_WARNING "PCI: No PCI; id reads as %x\n", id);
972 goto no_pci;
973 }
974
975 /*
976 * Enable flushing of the PCI-SDRAM queue upon a read
977 * of the SDRAM's Memory Configuration Register.
978 */
979 *(unsigned long *)QFLUSH_REG_1 = 3;
980
981 /* Configure PCI Host Controller. */
982 preg->if_status = ~0; /* Clear cause register bits */
983 preg->config_addr = 0; /* Clear config access */
984 preg->oatran = MSP_PCI_OATRAN; /* PCI outbound addr translation */
985 preg->if_mask = 0xF8BF87C0; /* Enable all PCI status interrupts */
986
987 /* configure so inb(), outb(), and family are functional */
988 set_io_port_base(MSP_PCI_IOSPACE_BASE);
989
990 /* Tell Linux the details of the MSP7120 PCI Host Controller */
991 register_pci_controller(&msp_pci_controller);
992
993 return;
994
995 no_pci:
996 /* Disable PCI channel */
997 printk(KERN_WARNING "PCI: no host PCI bus detected\n");
998 }
999