Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/parisc/lba_pci.c

  1 /*
  2 **
  3 **  PCI Lower Bus Adapter (LBA) manager
  4 **
  5 **      (c) Copyright 1999,2000 Grant Grundler
  6 **      (c) Copyright 1999,2000 Hewlett-Packard Company
  7 **
  8 **      This program is free software; you can redistribute it and/or modify
  9 **      it under the terms of the GNU General Public License as published by
 10 **      the Free Software Foundation; either version 2 of the License, or
 11 **      (at your option) any later version.
 12 **
 13 **
 14 ** This module primarily provides access to PCI bus (config/IOport
 15 ** spaces) on platforms with an SBA/LBA chipset. A/B/C/J/L/N-class
 16 ** with 4 digit model numbers - eg C3000 (and A400...sigh).
 17 **
 18 ** LBA driver isn't as simple as the Dino driver because:
 19 **   (a) this chip has substantial bug fixes between revisions
 20 **       (Only one Dino bug has a software workaround :^(  )
 21 **   (b) has more options which we don't (yet) support (DMA hints, OLARD)
 22 **   (c) IRQ support lives in the I/O SAPIC driver (not with PCI driver)
 23 **   (d) play nicely with both PAT and "Legacy" PA-RISC firmware (PDC).
 24 **       (dino only deals with "Legacy" PDC)
 25 **
 26 ** LBA driver passes the I/O SAPIC HPA to the I/O SAPIC driver.
 27 ** (I/O SAPIC is integratd in the LBA chip).
 28 **
 29 ** FIXME: Add support to SBA and LBA drivers for DMA hint sets
 30 ** FIXME: Add support for PCI card hot-plug (OLARD).
 31 */
 32 
 33 #include <linux/delay.h>
 34 #include <linux/types.h>
 35 #include <linux/kernel.h>
 36 #include <linux/spinlock.h>
 37 #include <linux/init.h>         /* for __init */
 38 #include <linux/pci.h>
 39 #include <linux/ioport.h>
 40 #include <linux/slab.h>
 41 
 42 #include <asm/byteorder.h>
 43 #include <asm/pdc.h>
 44 #include <asm/pdcpat.h>
 45 #include <asm/page.h>
 46 
 47 #include <asm/ropes.h>
 48 #include <asm/hardware.h>       /* for register_parisc_driver() stuff */
 49 #include <asm/parisc-device.h>
 50 #include <asm/io.h>             /* read/write stuff */
 51 
 52 #undef DEBUG_LBA        /* general stuff */
 53 #undef DEBUG_LBA_PORT   /* debug I/O Port access */
 54 #undef DEBUG_LBA_CFG    /* debug Config Space Access (ie PCI Bus walk) */
 55 #undef DEBUG_LBA_PAT    /* debug PCI Resource Mgt code - PDC PAT only */
 56 
 57 #undef FBB_SUPPORT      /* Fast Back-Back xfers - NOT READY YET */
 58 
 59 
 60 #ifdef DEBUG_LBA
 61 #define DBG(x...)       printk(x)
 62 #else
 63 #define DBG(x...)
 64 #endif
 65 
 66 #ifdef DEBUG_LBA_PORT
 67 #define DBG_PORT(x...)  printk(x)
 68 #else
 69 #define DBG_PORT(x...)
 70 #endif
 71 
 72 #ifdef DEBUG_LBA_CFG
 73 #define DBG_CFG(x...)   printk(x)
 74 #else
 75 #define DBG_CFG(x...)
 76 #endif
 77 
 78 #ifdef DEBUG_LBA_PAT
 79 #define DBG_PAT(x...)   printk(x)
 80 #else
 81 #define DBG_PAT(x...)
 82 #endif
 83 
 84 
 85 /*
 86 ** Config accessor functions only pass in the 8-bit bus number and not
 87 ** the 8-bit "PCI Segment" number. Each LBA will be assigned a PCI bus
 88 ** number based on what firmware wrote into the scratch register.
 89 **
 90 ** The "secondary" bus number is set to this before calling
 91 ** pci_register_ops(). If any PPB's are present, the scan will
 92 ** discover them and update the "secondary" and "subordinate"
 93 ** fields in the pci_bus structure.
 94 **
 95 ** Changes in the configuration *may* result in a different
 96 ** bus number for each LBA depending on what firmware does.
 97 */
 98 
 99 #define MODULE_NAME "LBA"
100 
101 /* non-postable I/O port space, densely packed */
102 #define LBA_PORT_BASE   (PCI_F_EXTEND | 0xfee00000UL)
103 static void __iomem *astro_iop_base __read_mostly;
104 
105 static u32 lba_t32;
106 
107 /* lba flags */
108 #define LBA_FLAG_SKIP_PROBE     0x10
109 
110 #define LBA_SKIP_PROBE(d) ((d)->flags & LBA_FLAG_SKIP_PROBE)
111 
112 
113 /* Looks nice and keeps the compiler happy */
114 #define LBA_DEV(d) ((struct lba_device *) (d))
115 
116 
117 /*
118 ** Only allow 8 subsidiary busses per LBA
119 ** Problem is the PCI bus numbering is globally shared.
120 */
121 #define LBA_MAX_NUM_BUSES 8
122 
123 /************************************
124  * LBA register read and write support
125  *
126  * BE WARNED: register writes are posted.
127  *  (ie follow writes which must reach HW with a read)
128  */
129 #define READ_U8(addr)  __raw_readb(addr)
130 #define READ_U16(addr) __raw_readw(addr)
131 #define READ_U32(addr) __raw_readl(addr)
132 #define WRITE_U8(value, addr)  __raw_writeb(value, addr)
133 #define WRITE_U16(value, addr) __raw_writew(value, addr)
134 #define WRITE_U32(value, addr) __raw_writel(value, addr)
135 
136 #define READ_REG8(addr)  readb(addr)
137 #define READ_REG16(addr) readw(addr)
138 #define READ_REG32(addr) readl(addr)
139 #define READ_REG64(addr) readq(addr)
140 #define WRITE_REG8(value, addr)  writeb(value, addr)
141 #define WRITE_REG16(value, addr) writew(value, addr)
142 #define WRITE_REG32(value, addr) writel(value, addr)
143 
144 
145 #define LBA_CFG_TOK(bus,dfn) ((u32) ((bus)<<16 | (dfn)<<8))
146 #define LBA_CFG_BUS(tok)  ((u8) ((tok)>>16))
147 #define LBA_CFG_DEV(tok)  ((u8) ((tok)>>11) & 0x1f)
148 #define LBA_CFG_FUNC(tok) ((u8) ((tok)>>8 ) & 0x7)
149 
150 
151 /*
152 ** Extract LBA (Rope) number from HPA
153 ** REVISIT: 16 ropes for Stretch/Ike?
154 */
155 #define ROPES_PER_IOC   8
156 #define LBA_NUM(x)    ((((unsigned long) x) >> 13) & (ROPES_PER_IOC-1))
157 
158 
159 static void
160 lba_dump_res(struct resource *r, int d)
161 {
162         int i;
163 
164         if (NULL == r)
165                 return;
166 
167         printk(KERN_DEBUG "(%p)", r->parent);
168         for (i = d; i ; --i) printk(" ");
169         printk(KERN_DEBUG "%p [%lx,%lx]/%lx\n", r,
170                 (long)r->start, (long)r->end, r->flags);
171         lba_dump_res(r->child, d+2);
172         lba_dump_res(r->sibling, d);
173 }
174 
175 
176 /*
177 ** LBA rev 2.0, 2.1, 2.2, and 3.0 bus walks require a complex
178 ** workaround for cfg cycles:
179 **      -- preserve  LBA state
180 **      -- prevent any DMA from occurring
181 **      -- turn on smart mode
182 **      -- probe with config writes before doing config reads
183 **      -- check ERROR_STATUS
184 **      -- clear ERROR_STATUS
185 **      -- restore LBA state
186 **
187 ** The workaround is only used for device discovery.
188 */
189 
190 static int lba_device_present(u8 bus, u8 dfn, struct lba_device *d)
191 {
192         u8 first_bus = d->hba.hba_bus->busn_res.start;
193         u8 last_sub_bus = d->hba.hba_bus->busn_res.end;
194 
195         if ((bus < first_bus) ||
196             (bus > last_sub_bus) ||
197             ((bus - first_bus) >= LBA_MAX_NUM_BUSES)) {
198                 return 0;
199         }
200 
201         return 1;
202 }
203 
204 
205 
206 #define LBA_CFG_SETUP(d, tok) {                         \
207     /* Save contents of error config register.  */                      \
208     error_config = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);             \
209 \
210     /* Save contents of status control register.  */                    \
211     status_control = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);               \
212 \
213     /* For LBA rev 2.0, 2.1, 2.2, and 3.0, we must disable DMA          \
214     ** arbitration for full bus walks.                                  \
215     */                                                                  \
216         /* Save contents of arb mask register. */                       \
217         arb_mask = READ_REG32(d->hba.base_addr + LBA_ARB_MASK);         \
218 \
219         /*                                                              \
220          * Turn off all device arbitration bits (i.e. everything        \
221          * except arbitration enable bit).                              \
222          */                                                             \
223         WRITE_REG32(0x1, d->hba.base_addr + LBA_ARB_MASK);              \
224 \
225     /*                                                                  \
226      * Set the smart mode bit so that master aborts don't cause         \
227      * LBA to go into PCI fatal mode (required).                        \
228      */                                                                 \
229     WRITE_REG32(error_config | LBA_SMART_MODE, d->hba.base_addr + LBA_ERROR_CONFIG);    \
230 }
231 
232 
233 #define LBA_CFG_PROBE(d, tok) {                         \
234     /*                                                                  \
235      * Setup Vendor ID write and read back the address register         \
236      * to make sure that LBA is the bus master.                         \
237      */                                                                 \
238     WRITE_REG32(tok | PCI_VENDOR_ID, (d)->hba.base_addr + LBA_PCI_CFG_ADDR);\
239     /*                                                                  \
240      * Read address register to ensure that LBA is the bus master,      \
241      * which implies that DMA traffic has stopped when DMA arb is off.  \
242      */                                                                 \
243     lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);        \
244     /*                                                                  \
245      * Generate a cfg write cycle (will have no affect on               \
246      * Vendor ID register since read-only).                             \
247      */                                                                 \
248     WRITE_REG32(~0, (d)->hba.base_addr + LBA_PCI_CFG_DATA);             \
249     /*                                                                  \
250      * Make sure write has completed before proceeding further,         \
251      * i.e. before setting clear enable.                                \
252      */                                                                 \
253     lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);        \
254 }
255 
256 
257 /*
258  * HPREVISIT:
259  *   -- Can't tell if config cycle got the error.
260  *
261  *              OV bit is broken until rev 4.0, so can't use OV bit and
262  *              LBA_ERROR_LOG_ADDR to tell if error belongs to config cycle.
263  *
264  *              As of rev 4.0, no longer need the error check.
265  *
266  *   -- Even if we could tell, we still want to return -1
267  *      for **ANY** error (not just master abort).
268  *
269  *   -- Only clear non-fatal errors (we don't want to bring
270  *      LBA out of pci-fatal mode).
271  *
272  *              Actually, there is still a race in which
273  *              we could be clearing a fatal error.  We will
274  *              live with this during our initial bus walk
275  *              until rev 4.0 (no driver activity during
276  *              initial bus walk).  The initial bus walk
277  *              has race conditions concerning the use of
278  *              smart mode as well.
279  */
280 
281 #define LBA_MASTER_ABORT_ERROR 0xc
282 #define LBA_FATAL_ERROR 0x10
283 
284 #define LBA_CFG_MASTER_ABORT_CHECK(d, base, tok, error) {               \
285     u32 error_status = 0;                                               \
286     /*                                                                  \
287      * Set clear enable (CE) bit. Unset by HW when new                  \
288      * errors are logged -- LBA HW ERS section 14.3.3).         \
289      */                                                                 \
290     WRITE_REG32(status_control | CLEAR_ERRLOG_ENABLE, base + LBA_STAT_CTL); \
291     error_status = READ_REG32(base + LBA_ERROR_STATUS);         \
292     if ((error_status & 0x1f) != 0) {                                   \
293         /*                                                              \
294          * Fail the config read request.                                \
295          */                                                             \
296         error = 1;                                                      \
297         if ((error_status & LBA_FATAL_ERROR) == 0) {                    \
298             /*                                                          \
299              * Clear error status (if fatal bit not set) by setting     \
300              * clear error log bit (CL).                                \
301              */                                                         \
302             WRITE_REG32(status_control | CLEAR_ERRLOG, base + LBA_STAT_CTL); \
303         }                                                               \
304     }                                                                   \
305 }
306 
307 #define LBA_CFG_TR4_ADDR_SETUP(d, addr)                                 \
308         WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR);
309 
310 #define LBA_CFG_ADDR_SETUP(d, addr) {                                   \
311     WRITE_REG32(((addr) & ~3), (d)->hba.base_addr + LBA_PCI_CFG_ADDR);  \
312     /*                                                                  \
313      * Read address register to ensure that LBA is the bus master,      \
314      * which implies that DMA traffic has stopped when DMA arb is off.  \
315      */                                                                 \
316     lba_t32 = READ_REG32((d)->hba.base_addr + LBA_PCI_CFG_ADDR);        \
317 }
318 
319 
320 #define LBA_CFG_RESTORE(d, base) {                                      \
321     /*                                                                  \
322      * Restore status control register (turn off clear enable).         \
323      */                                                                 \
324     WRITE_REG32(status_control, base + LBA_STAT_CTL);                   \
325     /*                                                                  \
326      * Restore error config register (turn off smart mode).             \
327      */                                                                 \
328     WRITE_REG32(error_config, base + LBA_ERROR_CONFIG);                 \
329         /*                                                              \
330          * Restore arb mask register (reenables DMA arbitration).       \
331          */                                                             \
332         WRITE_REG32(arb_mask, base + LBA_ARB_MASK);                     \
333 }
334 
335 
336 
337 static unsigned int
338 lba_rd_cfg(struct lba_device *d, u32 tok, u8 reg, u32 size)
339 {
340         u32 data = ~0U;
341         int error = 0;
342         u32 arb_mask = 0;       /* used by LBA_CFG_SETUP/RESTORE */
343         u32 error_config = 0;   /* used by LBA_CFG_SETUP/RESTORE */
344         u32 status_control = 0; /* used by LBA_CFG_SETUP/RESTORE */
345 
346         LBA_CFG_SETUP(d, tok);
347         LBA_CFG_PROBE(d, tok);
348         LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
349         if (!error) {
350                 void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
351 
352                 LBA_CFG_ADDR_SETUP(d, tok | reg);
353                 switch (size) {
354                 case 1: data = (u32) READ_REG8(data_reg + (reg & 3)); break;
355                 case 2: data = (u32) READ_REG16(data_reg+ (reg & 2)); break;
356                 case 4: data = READ_REG32(data_reg); break;
357                 }
358         }
359         LBA_CFG_RESTORE(d, d->hba.base_addr);
360         return(data);
361 }
362 
363 
364 static int elroy_cfg_read(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 *data)
365 {
366         struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
367         u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
368         u32 tok = LBA_CFG_TOK(local_bus, devfn);
369         void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
370 
371         if ((pos > 255) || (devfn > 255))
372                 return -EINVAL;
373 
374 /* FIXME: B2K/C3600 workaround is always use old method... */
375         /* if (!LBA_SKIP_PROBE(d)) */ {
376                 /* original - Generate config cycle on broken elroy
377                   with risk we will miss PCI bus errors. */
378                 *data = lba_rd_cfg(d, tok, pos, size);
379                 DBG_CFG("%s(%x+%2x) -> 0x%x (a)\n", __func__, tok, pos, *data);
380                 return 0;
381         }
382 
383         if (LBA_SKIP_PROBE(d) && !lba_device_present(bus->busn_res.start, devfn, d)) {
384                 DBG_CFG("%s(%x+%2x) -> -1 (b)\n", __func__, tok, pos);
385                 /* either don't want to look or know device isn't present. */
386                 *data = ~0U;
387                 return(0);
388         }
389 
390         /* Basic Algorithm
391         ** Should only get here on fully working LBA rev.
392         ** This is how simple the code should have been.
393         */
394         LBA_CFG_ADDR_SETUP(d, tok | pos);
395         switch(size) {
396         case 1: *data = READ_REG8 (data_reg + (pos & 3)); break;
397         case 2: *data = READ_REG16(data_reg + (pos & 2)); break;
398         case 4: *data = READ_REG32(data_reg); break;
399         }
400         DBG_CFG("%s(%x+%2x) -> 0x%x (c)\n", __func__, tok, pos, *data);
401         return 0;
402 }
403 
404 
405 static void
406 lba_wr_cfg(struct lba_device *d, u32 tok, u8 reg, u32 data, u32 size)
407 {
408         int error = 0;
409         u32 arb_mask = 0;
410         u32 error_config = 0;
411         u32 status_control = 0;
412         void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
413 
414         LBA_CFG_SETUP(d, tok);
415         LBA_CFG_ADDR_SETUP(d, tok | reg);
416         switch (size) {
417         case 1: WRITE_REG8 (data, data_reg + (reg & 3)); break;
418         case 2: WRITE_REG16(data, data_reg + (reg & 2)); break;
419         case 4: WRITE_REG32(data, data_reg);             break;
420         }
421         LBA_CFG_MASTER_ABORT_CHECK(d, d->hba.base_addr, tok, error);
422         LBA_CFG_RESTORE(d, d->hba.base_addr);
423 }
424 
425 
426 /*
427  * LBA 4.0 config write code implements non-postable semantics
428  * by doing a read of CONFIG ADDR after the write.
429  */
430 
431 static int elroy_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
432 {
433         struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
434         u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
435         u32 tok = LBA_CFG_TOK(local_bus,devfn);
436 
437         if ((pos > 255) || (devfn > 255))
438                 return -EINVAL;
439 
440         if (!LBA_SKIP_PROBE(d)) {
441                 /* Original Workaround */
442                 lba_wr_cfg(d, tok, pos, (u32) data, size);
443                 DBG_CFG("%s(%x+%2x) = 0x%x (a)\n", __func__, tok, pos,data);
444                 return 0;
445         }
446 
447         if (LBA_SKIP_PROBE(d) && (!lba_device_present(bus->busn_res.start, devfn, d))) {
448                 DBG_CFG("%s(%x+%2x) = 0x%x (b)\n", __func__, tok, pos,data);
449                 return 1; /* New Workaround */
450         }
451 
452         DBG_CFG("%s(%x+%2x) = 0x%x (c)\n", __func__, tok, pos, data);
453 
454         /* Basic Algorithm */
455         LBA_CFG_ADDR_SETUP(d, tok | pos);
456         switch(size) {
457         case 1: WRITE_REG8 (data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 3));
458                    break;
459         case 2: WRITE_REG16(data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 2));
460                    break;
461         case 4: WRITE_REG32(data, d->hba.base_addr + LBA_PCI_CFG_DATA);
462                    break;
463         }
464         /* flush posted write */
465         lba_t32 = READ_REG32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
466         return 0;
467 }
468 
469 
470 static struct pci_ops elroy_cfg_ops = {
471         .read =         elroy_cfg_read,
472         .write =        elroy_cfg_write,
473 };
474 
475 /*
476  * The mercury_cfg_ops are slightly misnamed; they're also used for Elroy
477  * TR4.0 as no additional bugs were found in this areea between Elroy and
478  * Mercury
479  */
480 
481 static int mercury_cfg_read(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 *data)
482 {
483         struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
484         u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
485         u32 tok = LBA_CFG_TOK(local_bus, devfn);
486         void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
487 
488         if ((pos > 255) || (devfn > 255))
489                 return -EINVAL;
490 
491         LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
492         switch(size) {
493         case 1:
494                 *data = READ_REG8(data_reg + (pos & 3));
495                 break;
496         case 2:
497                 *data = READ_REG16(data_reg + (pos & 2));
498                 break;
499         case 4:
500                 *data = READ_REG32(data_reg);             break;
501                 break;
502         }
503 
504         DBG_CFG("mercury_cfg_read(%x+%2x) -> 0x%x\n", tok, pos, *data);
505         return 0;
506 }
507 
508 /*
509  * LBA 4.0 config write code implements non-postable semantics
510  * by doing a read of CONFIG ADDR after the write.
511  */
512 
513 static int mercury_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
514 {
515         struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
516         void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
517         u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
518         u32 tok = LBA_CFG_TOK(local_bus,devfn);
519 
520         if ((pos > 255) || (devfn > 255))
521                 return -EINVAL;
522 
523         DBG_CFG("%s(%x+%2x) <- 0x%x (c)\n", __func__, tok, pos, data);
524 
525         LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
526         switch(size) {
527         case 1:
528                 WRITE_REG8 (data, data_reg + (pos & 3));
529                 break;
530         case 2:
531                 WRITE_REG16(data, data_reg + (pos & 2));
532                 break;
533         case 4:
534                 WRITE_REG32(data, data_reg);
535                 break;
536         }
537 
538         /* flush posted write */
539         lba_t32 = READ_U32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
540         return 0;
541 }
542 
543 static struct pci_ops mercury_cfg_ops = {
544         .read =         mercury_cfg_read,
545         .write =        mercury_cfg_write,
546 };
547 
548 
549 static void
550 lba_bios_init(void)
551 {
552         DBG(MODULE_NAME ": lba_bios_init\n");
553 }
554 
555 
556 #ifdef CONFIG_64BIT
557 
558 /*
559  * truncate_pat_collision:  Deal with overlaps or outright collisions
560  *                      between PAT PDC reported ranges.
561  *
562  *   Broken PA8800 firmware will report lmmio range that
563  *   overlaps with CPU HPA. Just truncate the lmmio range.
564  *
565  *   BEWARE: conflicts with this lmmio range may be an
566  *   elmmio range which is pointing down another rope.
567  *
568  *  FIXME: only deals with one collision per range...theoretically we
569  *  could have several. Supporting more than one collision will get messy.
570  */
571 static unsigned long
572 truncate_pat_collision(struct resource *root, struct resource *new)
573 {
574         unsigned long start = new->start;
575         unsigned long end = new->end;
576         struct resource *tmp = root->child;
577 
578         if (end <= start || start < root->start || !tmp)
579                 return 0;
580 
581         /* find first overlap */
582         while (tmp && tmp->end < start)
583                 tmp = tmp->sibling;
584 
585         /* no entries overlap */
586         if (!tmp)  return 0;
587 
588         /* found one that starts behind the new one
589         ** Don't need to do anything.
590         */
591         if (tmp->start >= end) return 0;
592 
593         if (tmp->start <= start) {
594                 /* "front" of new one overlaps */
595                 new->start = tmp->end + 1;
596 
597                 if (tmp->end >= end) {
598                         /* AACCKK! totally overlaps! drop this range. */
599                         return 1;
600                 }
601         } 
602 
603         if (tmp->end < end ) {
604                 /* "end" of new one overlaps */
605                 new->end = tmp->start - 1;
606         }
607 
608         printk(KERN_WARNING "LBA: Truncating lmmio_space [%lx/%lx] "
609                                         "to [%lx,%lx]\n",
610                         start, end,
611                         (long)new->start, (long)new->end );
612 
613         return 0;       /* truncation successful */
614 }
615 
616 /*
617  * extend_lmmio_len: extend lmmio range to maximum length
618  *
619  * This is needed at least on C8000 systems to get the ATI FireGL card
620  * working. On other systems we will currently not extend the lmmio space.
621  */
622 static unsigned long
623 extend_lmmio_len(unsigned long start, unsigned long end, unsigned long lba_len)
624 {
625         struct resource *tmp;
626 
627         pr_debug("LMMIO mismatch: PAT length = 0x%lx, MASK register = 0x%lx\n",
628                 end - start, lba_len);
629 
630         lba_len = min(lba_len+1, 256UL*1024*1024); /* limit to 256 MB */
631 
632         pr_debug("LBA: lmmio_space [0x%lx-0x%lx] - original\n", start, end);
633 
634         if (boot_cpu_data.cpu_type < mako) {
635                 pr_info("LBA: Not a C8000 system - not extending LMMIO range.\n");
636                 return end;
637         }
638 
639         end += lba_len;
640         if (end < start) /* fix overflow */
641                 end = -1ULL;
642 
643         pr_debug("LBA: lmmio_space [0x%lx-0x%lx] - current\n", start, end);
644 
645         /* first overlap */
646         for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
647                 pr_debug("LBA: testing %pR\n", tmp);
648                 if (tmp->start == start)
649                         continue; /* ignore ourself */
650                 if (tmp->end < start)
651                         continue;
652                 if (tmp->start > end)
653                         continue;
654                 if (end >= tmp->start)
655                         end = tmp->start - 1;
656         }
657 
658         pr_info("LBA: lmmio_space [0x%lx-0x%lx] - new\n", start, end);
659 
660         /* return new end */
661         return end;
662 }
663 
664 #else
665 #define truncate_pat_collision(r,n)  (0)
666 #endif
667 
668 /*
669 ** The algorithm is generic code.
670 ** But it needs to access local data structures to get the IRQ base.
671 ** Could make this a "pci_fixup_irq(bus, region)" but not sure
672 ** it's worth it.
673 **
674 ** Called by do_pci_scan_bus() immediately after each PCI bus is walked.
675 ** Resources aren't allocated until recursive buswalk below HBA is completed.
676 */
677 static void
678 lba_fixup_bus(struct pci_bus *bus)
679 {
680         struct pci_dev *dev;
681 #ifdef FBB_SUPPORT
682         u16 status;
683 #endif
684         struct lba_device *ldev = LBA_DEV(parisc_walk_tree(bus->bridge));
685 
686         DBG("lba_fixup_bus(0x%p) bus %d platform_data 0x%p\n",
687                 bus, (int)bus->busn_res.start, bus->bridge->platform_data);
688 
689         /*
690         ** Properly Setup MMIO resources for this bus.
691         ** pci_alloc_primary_bus() mangles this.
692         */
693         if (bus->parent) {
694                 int i;
695                 /* PCI-PCI Bridge */
696                 pci_read_bridge_bases(bus);
697                 for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
698                         pci_claim_resource(bus->self, i);
699                 }
700         } else {
701                 /* Host-PCI Bridge */
702                 int err;
703 
704                 DBG("lba_fixup_bus() %s [%lx/%lx]/%lx\n",
705                         ldev->hba.io_space.name,
706                         ldev->hba.io_space.start, ldev->hba.io_space.end,
707                         ldev->hba.io_space.flags);
708                 DBG("lba_fixup_bus() %s [%lx/%lx]/%lx\n",
709                         ldev->hba.lmmio_space.name,
710                         ldev->hba.lmmio_space.start, ldev->hba.lmmio_space.end,
711                         ldev->hba.lmmio_space.flags);
712 
713                 err = request_resource(&ioport_resource, &(ldev->hba.io_space));
714                 if (err < 0) {
715                         lba_dump_res(&ioport_resource, 2);
716                         BUG();
717                 }
718 
719                 if (ldev->hba.elmmio_space.flags) {
720                         err = request_resource(&iomem_resource,
721                                         &(ldev->hba.elmmio_space));
722                         if (err < 0) {
723 
724                                 printk("FAILED: lba_fixup_bus() request for "
725                                                 "elmmio_space [%lx/%lx]\n",
726                                                 (long)ldev->hba.elmmio_space.start,
727                                                 (long)ldev->hba.elmmio_space.end);
728 
729                                 /* lba_dump_res(&iomem_resource, 2); */
730                                 /* BUG(); */
731                         }
732                 }
733 
734                 if (ldev->hba.lmmio_space.flags) {
735                         err = request_resource(&iomem_resource, &(ldev->hba.lmmio_space));
736                         if (err < 0) {
737                                 printk(KERN_ERR "FAILED: lba_fixup_bus() request for "
738                                         "lmmio_space [%lx/%lx]\n",
739                                         (long)ldev->hba.lmmio_space.start,
740                                         (long)ldev->hba.lmmio_space.end);
741                         }
742                 }
743 
744 #ifdef CONFIG_64BIT
745                 /* GMMIO is  distributed range. Every LBA/Rope gets part it. */
746                 if (ldev->hba.gmmio_space.flags) {
747                         err = request_resource(&iomem_resource, &(ldev->hba.gmmio_space));
748                         if (err < 0) {
749                                 printk("FAILED: lba_fixup_bus() request for "
750                                         "gmmio_space [%lx/%lx]\n",
751                                         (long)ldev->hba.gmmio_space.start,
752                                         (long)ldev->hba.gmmio_space.end);
753                                 lba_dump_res(&iomem_resource, 2);
754                                 BUG();
755                         }
756                 }
757 #endif
758 
759         }
760 
761         list_for_each_entry(dev, &bus->devices, bus_list) {
762                 int i;
763 
764                 DBG("lba_fixup_bus() %s\n", pci_name(dev));
765 
766                 /* Virtualize Device/Bridge Resources. */
767                 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
768                         struct resource *res = &dev->resource[i];
769 
770                         /* If resource not allocated - skip it */
771                         if (!res->start)
772                                 continue;
773 
774                         /*
775                         ** FIXME: this will result in whinging for devices
776                         ** that share expansion ROMs (think quad tulip), but
777                         ** isn't harmful.
778                         */
779                         pci_claim_resource(dev, i);
780                 }
781 
782 #ifdef FBB_SUPPORT
783                 /*
784                 ** If one device does not support FBB transfers,
785                 ** No one on the bus can be allowed to use them.
786                 */
787                 (void) pci_read_config_word(dev, PCI_STATUS, &status);
788                 bus->bridge_ctl &= ~(status & PCI_STATUS_FAST_BACK);
789 #endif
790 
791                 /*
792                 ** P2PB's have no IRQs. ignore them.
793                 */
794                 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
795                         continue;
796 
797                 /* Adjust INTERRUPT_LINE for this dev */
798                 iosapic_fixup_irq(ldev->iosapic_obj, dev);
799         }
800 
801 #ifdef FBB_SUPPORT
802 /* FIXME/REVISIT - finish figuring out to set FBB on both
803 ** pci_setup_bridge() clobbers PCI_BRIDGE_CONTROL.
804 ** Can't fixup here anyway....garr...
805 */
806         if (fbb_enable) {
807                 if (bus->parent) {
808                         u8 control;
809                         /* enable on PPB */
810                         (void) pci_read_config_byte(bus->self, PCI_BRIDGE_CONTROL, &control);
811                         (void) pci_write_config_byte(bus->self, PCI_BRIDGE_CONTROL, control | PCI_STATUS_FAST_BACK);
812 
813                 } else {
814                         /* enable on LBA */
815                 }
816                 fbb_enable = PCI_COMMAND_FAST_BACK;
817         }
818 
819         /* Lastly enable FBB/PERR/SERR on all devices too */
820         list_for_each_entry(dev, &bus->devices, bus_list) {
821                 (void) pci_read_config_word(dev, PCI_COMMAND, &status);
822                 status |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR | fbb_enable;
823                 (void) pci_write_config_word(dev, PCI_COMMAND, status);
824         }
825 #endif
826 }
827 
828 
829 static struct pci_bios_ops lba_bios_ops = {
830         .init =         lba_bios_init,
831         .fixup_bus =    lba_fixup_bus,
832 };
833 
834 
835 
836 
837 /*******************************************************
838 **
839 ** LBA Sprockets "I/O Port" Space Accessor Functions
840 **
841 ** This set of accessor functions is intended for use with
842 ** "legacy firmware" (ie Sprockets on Allegro/Forte boxes).
843 **
844 ** Many PCI devices don't require use of I/O port space (eg Tulip,
845 ** NCR720) since they export the same registers to both MMIO and
846 ** I/O port space. In general I/O port space is slower than
847 ** MMIO since drivers are designed so PIO writes can be posted.
848 **
849 ********************************************************/
850 
851 #define LBA_PORT_IN(size, mask) \
852 static u##size lba_astro_in##size (struct pci_hba_data *d, u16 addr) \
853 { \
854         u##size t; \
855         t = READ_REG##size(astro_iop_base + addr); \
856         DBG_PORT(" 0x%x\n", t); \
857         return (t); \
858 }
859 
860 LBA_PORT_IN( 8, 3)
861 LBA_PORT_IN(16, 2)
862 LBA_PORT_IN(32, 0)
863 
864 
865 
866 /*
867 ** BUG X4107:  Ordering broken - DMA RD return can bypass PIO WR
868 **
869 ** Fixed in Elroy 2.2. The READ_U32(..., LBA_FUNC_ID) below is
870 ** guarantee non-postable completion semantics - not avoid X4107.
871 ** The READ_U32 only guarantees the write data gets to elroy but
872 ** out to the PCI bus. We can't read stuff from I/O port space
873 ** since we don't know what has side-effects. Attempting to read
874 ** from configuration space would be suicidal given the number of
875 ** bugs in that elroy functionality.
876 **
877 **      Description:
878 **          DMA read results can improperly pass PIO writes (X4107).  The
879 **          result of this bug is that if a processor modifies a location in
880 **          memory after having issued PIO writes, the PIO writes are not
881 **          guaranteed to be completed before a PCI device is allowed to see
882 **          the modified data in a DMA read.
883 **
884 **          Note that IKE bug X3719 in TR1 IKEs will result in the same
885 **          symptom.
886 **
887 **      Workaround:
888 **          The workaround for this bug is to always follow a PIO write with
889 **          a PIO read to the same bus before starting DMA on that PCI bus.
890 **
891 */
892 #define LBA_PORT_OUT(size, mask) \
893 static void lba_astro_out##size (struct pci_hba_data *d, u16 addr, u##size val) \
894 { \
895         DBG_PORT("%s(0x%p, 0x%x, 0x%x)\n", __func__, d, addr, val); \
896         WRITE_REG##size(val, astro_iop_base + addr); \
897         if (LBA_DEV(d)->hw_rev < 3) \
898                 lba_t32 = READ_U32(d->base_addr + LBA_FUNC_ID); \
899 }
900 
901 LBA_PORT_OUT( 8, 3)
902 LBA_PORT_OUT(16, 2)
903 LBA_PORT_OUT(32, 0)
904 
905 
906 static struct pci_port_ops lba_astro_port_ops = {
907         .inb =  lba_astro_in8,
908         .inw =  lba_astro_in16,
909         .inl =  lba_astro_in32,
910         .outb = lba_astro_out8,
911         .outw = lba_astro_out16,
912         .outl = lba_astro_out32
913 };
914 
915 
916 #ifdef CONFIG_64BIT
917 #define PIOP_TO_GMMIO(lba, addr) \
918         ((lba)->iop_base + (((addr)&0xFFFC)<<10) + ((addr)&3))
919 
920 /*******************************************************
921 **
922 ** LBA PAT "I/O Port" Space Accessor Functions
923 **
924 ** This set of accessor functions is intended for use with
925 ** "PAT PDC" firmware (ie Prelude/Rhapsody/Piranha boxes).
926 **
927 ** This uses the PIOP space located in the first 64MB of GMMIO.
928 ** Each rope gets a full 64*KB* (ie 4 bytes per page) this way.
929 ** bits 1:0 stay the same.  bits 15:2 become 25:12.
930 ** Then add the base and we can generate an I/O Port cycle.
931 ********************************************************/
932 #undef LBA_PORT_IN
933 #define LBA_PORT_IN(size, mask) \
934 static u##size lba_pat_in##size (struct pci_hba_data *l, u16 addr) \
935 { \
936         u##size t; \
937         DBG_PORT("%s(0x%p, 0x%x) ->", __func__, l, addr); \
938         t = READ_REG##size(PIOP_TO_GMMIO(LBA_DEV(l), addr)); \
939         DBG_PORT(" 0x%x\n", t); \
940         return (t); \
941 }
942 
943 LBA_PORT_IN( 8, 3)
944 LBA_PORT_IN(16, 2)
945 LBA_PORT_IN(32, 0)
946 
947 
948 #undef LBA_PORT_OUT
949 #define LBA_PORT_OUT(size, mask) \
950 static void lba_pat_out##size (struct pci_hba_data *l, u16 addr, u##size val) \
951 { \
952         void __iomem *where = PIOP_TO_GMMIO(LBA_DEV(l), addr); \
953         DBG_PORT("%s(0x%p, 0x%x, 0x%x)\n", __func__, l, addr, val); \
954         WRITE_REG##size(val, where); \
955         /* flush the I/O down to the elroy at least */ \
956         lba_t32 = READ_U32(l->base_addr + LBA_FUNC_ID); \
957 }
958 
959 LBA_PORT_OUT( 8, 3)
960 LBA_PORT_OUT(16, 2)
961 LBA_PORT_OUT(32, 0)
962 
963 
964 static struct pci_port_ops lba_pat_port_ops = {
965         .inb =  lba_pat_in8,
966         .inw =  lba_pat_in16,
967         .inl =  lba_pat_in32,
968         .outb = lba_pat_out8,
969         .outw = lba_pat_out16,
970         .outl = lba_pat_out32
971 };
972 
973 
974 
975 /*
976 ** make range information from PDC available to PCI subsystem.
977 ** We make the PDC call here in order to get the PCI bus range
978 ** numbers. The rest will get forwarded in pcibios_fixup_bus().
979 ** We don't have a struct pci_bus assigned to us yet.
980 */
981 static void
982 lba_pat_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
983 {
984         unsigned long bytecnt;
985         long io_count;
986         long status;    /* PDC return status */
987         long pa_count;
988         pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;    /* PA_VIEW */
989         pdc_pat_cell_mod_maddr_block_t *io_pdc_cell;    /* IO_VIEW */
990         int i;
991 
992         pa_pdc_cell = kzalloc(sizeof(pdc_pat_cell_mod_maddr_block_t), GFP_KERNEL);
993         if (!pa_pdc_cell)
994                 return;
995 
996         io_pdc_cell = kzalloc(sizeof(pdc_pat_cell_mod_maddr_block_t), GFP_KERNEL);
997         if (!io_pdc_cell) {
998                 kfree(pa_pdc_cell);
999                 return;
1000         }
1001 
1002         /* return cell module (IO view) */
1003         status = pdc_pat_cell_module(&bytecnt, pa_dev->pcell_loc, pa_dev->mod_index,
1004                                 PA_VIEW, pa_pdc_cell);
1005         pa_count = pa_pdc_cell->mod[1];
1006 
1007         status |= pdc_pat_cell_module(&bytecnt, pa_dev->pcell_loc, pa_dev->mod_index,
1008                                 IO_VIEW, io_pdc_cell);
1009         io_count = io_pdc_cell->mod[1];
1010 
1011         /* We've already done this once for device discovery...*/
1012         if (status != PDC_OK) {
1013                 panic("pdc_pat_cell_module() call failed for LBA!\n");
1014         }
1015 
1016         if (PAT_GET_ENTITY(pa_pdc_cell->mod_info) != PAT_ENTITY_LBA) {
1017                 panic("pdc_pat_cell_module() entity returned != PAT_ENTITY_LBA!\n");
1018         }
1019 
1020         /*
1021         ** Inspect the resources PAT tells us about
1022         */
1023         for (i = 0; i < pa_count; i++) {
1024                 struct {
1025                         unsigned long type;
1026                         unsigned long start;
1027                         unsigned long end;      /* aka finish */
1028                 } *p, *io;
1029                 struct resource *r;
1030 
1031                 p = (void *) &(pa_pdc_cell->mod[2+i*3]);
1032                 io = (void *) &(io_pdc_cell->mod[2+i*3]);
1033 
1034                 /* Convert the PAT range data to PCI "struct resource" */
1035                 switch(p->type & 0xff) {
1036                 case PAT_PBNUM:
1037                         lba_dev->hba.bus_num.start = p->start;
1038                         lba_dev->hba.bus_num.end   = p->end;
1039                         lba_dev->hba.bus_num.flags = IORESOURCE_BUS;
1040                         break;
1041 
1042                 case PAT_LMMIO:
1043                         /* used to fix up pre-initialized MEM BARs */
1044                         if (!lba_dev->hba.lmmio_space.flags) {
1045                                 unsigned long lba_len;
1046 
1047                                 lba_len = ~READ_REG32(lba_dev->hba.base_addr
1048                                                 + LBA_LMMIO_MASK);
1049                                 if ((p->end - p->start) != lba_len)
1050                                         p->end = extend_lmmio_len(p->start,
1051                                                 p->end, lba_len);
1052 
1053                                 sprintf(lba_dev->hba.lmmio_name,
1054                                                 "PCI%02x LMMIO",
1055                                                 (int)lba_dev->hba.bus_num.start);
1056                                 lba_dev->hba.lmmio_space_offset = p->start -
1057                                         io->start;
1058                                 r = &lba_dev->hba.lmmio_space;
1059                                 r->name = lba_dev->hba.lmmio_name;
1060                         } else if (!lba_dev->hba.elmmio_space.flags) {
1061                                 sprintf(lba_dev->hba.elmmio_name,
1062                                                 "PCI%02x ELMMIO",
1063                                                 (int)lba_dev->hba.bus_num.start);
1064                                 r = &lba_dev->hba.elmmio_space;
1065                                 r->name = lba_dev->hba.elmmio_name;
1066                         } else {
1067                                 printk(KERN_WARNING MODULE_NAME
1068                                         " only supports 2 LMMIO resources!\n");
1069                                 break;
1070                         }
1071 
1072                         r->start  = p->start;
1073                         r->end    = p->end;
1074                         r->flags  = IORESOURCE_MEM;
1075                         r->parent = r->sibling = r->child = NULL;
1076                         break;
1077 
1078                 case PAT_GMMIO:
1079                         /* MMIO space > 4GB phys addr; for 64-bit BAR */
1080                         sprintf(lba_dev->hba.gmmio_name, "PCI%02x GMMIO",
1081                                         (int)lba_dev->hba.bus_num.start);
1082                         r = &lba_dev->hba.gmmio_space;
1083                         r->name  = lba_dev->hba.gmmio_name;
1084                         r->start  = p->start;
1085                         r->end    = p->end;
1086                         r->flags  = IORESOURCE_MEM;
1087                         r->parent = r->sibling = r->child = NULL;
1088                         break;
1089 
1090                 case PAT_NPIOP:
1091                         printk(KERN_WARNING MODULE_NAME
1092                                 " range[%d] : ignoring NPIOP (0x%lx)\n",
1093                                 i, p->start);
1094                         break;
1095 
1096                 case PAT_PIOP:
1097                         /*
1098                         ** Postable I/O port space is per PCI host adapter.
1099                         ** base of 64MB PIOP region
1100                         */
1101                         lba_dev->iop_base = ioremap_nocache(p->start, 64 * 1024 * 1024);
1102 
1103                         sprintf(lba_dev->hba.io_name, "PCI%02x Ports",
1104                                         (int)lba_dev->hba.bus_num.start);
1105                         r = &lba_dev->hba.io_space;
1106                         r->name  = lba_dev->hba.io_name;
1107                         r->start  = HBA_PORT_BASE(lba_dev->hba.hba_num);
1108                         r->end    = r->start + HBA_PORT_SPACE_SIZE - 1;
1109                         r->flags  = IORESOURCE_IO;
1110                         r->parent = r->sibling = r->child = NULL;
1111                         break;
1112 
1113                 default:
1114                         printk(KERN_WARNING MODULE_NAME
1115                                 " range[%d] : unknown pat range type (0x%lx)\n",
1116                                 i, p->type & 0xff);
1117                         break;
1118                 }
1119         }
1120 
1121         kfree(pa_pdc_cell);
1122         kfree(io_pdc_cell);
1123 }
1124 #else
1125 /* keep compiler from complaining about missing declarations */
1126 #define lba_pat_port_ops lba_astro_port_ops
1127 #define lba_pat_resources(pa_dev, lba_dev)
1128 #endif  /* CONFIG_64BIT */
1129 
1130 
1131 extern void sba_distributed_lmmio(struct parisc_device *, struct resource *);
1132 extern void sba_directed_lmmio(struct parisc_device *, struct resource *);
1133 
1134 
1135 static void
1136 lba_legacy_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
1137 {
1138         struct resource *r;
1139         int lba_num;
1140 
1141         lba_dev->hba.lmmio_space_offset = PCI_F_EXTEND;
1142 
1143         /*
1144         ** With "legacy" firmware, the lowest byte of FW_SCRATCH
1145         ** represents bus->secondary and the second byte represents
1146         ** bus->subsidiary (i.e. highest PPB programmed by firmware).
1147         ** PCI bus walk *should* end up with the same result.
1148         ** FIXME: But we don't have sanity checks in PCI or LBA.
1149         */
1150         lba_num = READ_REG32(lba_dev->hba.base_addr + LBA_FW_SCRATCH);
1151         r = &(lba_dev->hba.bus_num);
1152         r->name = "LBA PCI Busses";
1153         r->start = lba_num & 0xff;
1154         r->end = (lba_num>>8) & 0xff;
1155         r->flags = IORESOURCE_BUS;
1156 
1157         /* Set up local PCI Bus resources - we don't need them for
1158         ** Legacy boxes but it's nice to see in /proc/iomem.
1159         */
1160         r = &(lba_dev->hba.lmmio_space);
1161         sprintf(lba_dev->hba.lmmio_name, "PCI%02x LMMIO",
1162                                         (int)lba_dev->hba.bus_num.start);
1163         r->name  = lba_dev->hba.lmmio_name;
1164 
1165 #if 1
1166         /* We want the CPU -> IO routing of addresses.
1167          * The SBA BASE/MASK registers control CPU -> IO routing.
1168          * Ask SBA what is routed to this rope/LBA.
1169          */
1170         sba_distributed_lmmio(pa_dev, r);
1171 #else
1172         /*
1173          * The LBA BASE/MASK registers control IO -> System routing.
1174          *
1175          * The following code works but doesn't get us what we want.
1176          * Well, only because firmware (v5.0) on C3000 doesn't program
1177          * the LBA BASE/MASE registers to be the exact inverse of 
1178          * the corresponding SBA registers. Other Astro/Pluto
1179          * based platform firmware may do it right.
1180          *
1181          * Should someone want to mess with MSI, they may need to
1182          * reprogram LBA BASE/MASK registers. Thus preserve the code
1183          * below until MSI is known to work on C3000/A500/N4000/RP3440.
1184          *
1185          * Using the code below, /proc/iomem shows:
1186          * ...
1187          * f0000000-f0ffffff : PCI00 LMMIO
1188          *   f05d0000-f05d0000 : lcd_data
1189          *   f05d0008-f05d0008 : lcd_cmd
1190          * f1000000-f1ffffff : PCI01 LMMIO
1191          * f4000000-f4ffffff : PCI02 LMMIO
1192          *   f4000000-f4001fff : sym53c8xx
1193          *   f4002000-f4003fff : sym53c8xx
1194          *   f4004000-f40043ff : sym53c8xx
1195          *   f4005000-f40053ff : sym53c8xx
1196          *   f4007000-f4007fff : ohci_hcd
1197          *   f4008000-f40083ff : tulip
1198          * f6000000-f6ffffff : PCI03 LMMIO
1199          * f8000000-fbffffff : PCI00 ELMMIO
1200          *   fa100000-fa4fffff : stifb mmio
1201          *   fb000000-fb1fffff : stifb fb
1202          *
1203          * But everything listed under PCI02 actually lives under PCI00.
1204          * This is clearly wrong.
1205          *
1206          * Asking SBA how things are routed tells the correct story:
1207          * LMMIO_BASE/MASK/ROUTE f4000001 fc000000 00000000
1208          * DIR0_BASE/MASK/ROUTE fa000001 fe000000 00000006
1209          * DIR1_BASE/MASK/ROUTE f9000001 ff000000 00000004
1210          * DIR2_BASE/MASK/ROUTE f0000000 fc000000 00000000
1211          * DIR3_BASE/MASK/ROUTE f0000000 fc000000 00000000
1212          *
1213          * Which looks like this in /proc/iomem:
1214          * f4000000-f47fffff : PCI00 LMMIO
1215          *   f4000000-f4001fff : sym53c8xx
1216          *   ...[deteled core devices - same as above]...
1217          *   f4008000-f40083ff : tulip
1218          * f4800000-f4ffffff : PCI01 LMMIO
1219          * f6000000-f67fffff : PCI02 LMMIO
1220          * f7000000-f77fffff : PCI03 LMMIO
1221          * f9000000-f9ffffff : PCI02 ELMMIO
1222          * fa000000-fbffffff : PCI03 ELMMIO
1223          *   fa100000-fa4fffff : stifb mmio
1224          *   fb000000-fb1fffff : stifb fb
1225          *
1226          * ie all Built-in core are under now correctly under PCI00.
1227          * The "PCI02 ELMMIO" directed range is for:
1228          *  +-[02]---03.0  3Dfx Interactive, Inc. Voodoo 2
1229          *
1230          * All is well now.
1231          */
1232         r->start = READ_REG32(lba_dev->hba.base_addr + LBA_LMMIO_BASE);
1233         if (r->start & 1) {
1234                 unsigned long rsize;
1235 
1236                 r->flags = IORESOURCE_MEM;
1237                 /* mmio_mask also clears Enable bit */
1238                 r->start &= mmio_mask;
1239                 r->start = PCI_HOST_ADDR(HBA_DATA(lba_dev), r->start);
1240                 rsize = ~ READ_REG32(lba_dev->hba.base_addr + LBA_LMMIO_MASK);
1241 
1242                 /*
1243                 ** Each rope only gets part of the distributed range.
1244                 ** Adjust "window" for this rope.
1245                 */
1246                 rsize /= ROPES_PER_IOC;
1247                 r->start += (rsize + 1) * LBA_NUM(pa_dev->hpa.start);
1248                 r->end = r->start + rsize;
1249         } else {
1250                 r->end = r->start = 0;  /* Not enabled. */
1251         }
1252 #endif
1253 
1254         /*
1255         ** "Directed" ranges are used when the "distributed range" isn't
1256         ** sufficient for all devices below a given LBA.  Typically devices
1257         ** like graphics cards or X25 may need a directed range when the
1258         ** bus has multiple slots (ie multiple devices) or the device
1259         ** needs more than the typical 4 or 8MB a distributed range offers.
1260         **
1261         ** The main reason for ignoring it now frigging complications.
1262         ** Directed ranges may overlap (and have precedence) over
1263         ** distributed ranges. Or a distributed range assigned to a unused
1264         ** rope may be used by a directed range on a different rope.
1265         ** Support for graphics devices may require fixing this
1266         ** since they may be assigned a directed range which overlaps
1267         ** an existing (but unused portion of) distributed range.
1268         */
1269         r = &(lba_dev->hba.elmmio_space);
1270         sprintf(lba_dev->hba.elmmio_name, "PCI%02x ELMMIO",
1271                                         (int)lba_dev->hba.bus_num.start);
1272         r->name  = lba_dev->hba.elmmio_name;
1273 
1274 #if 1
1275         /* See comment which precedes call to sba_directed_lmmio() */
1276         sba_directed_lmmio(pa_dev, r);
1277 #else
1278         r->start = READ_REG32(lba_dev->hba.base_addr + LBA_ELMMIO_BASE);
1279 
1280         if (r->start & 1) {
1281                 unsigned long rsize;
1282                 r->flags = IORESOURCE_MEM;
1283                 /* mmio_mask also clears Enable bit */
1284                 r->start &= mmio_mask;
1285                 r->start = PCI_HOST_ADDR(HBA_DATA(lba_dev), r->start);
1286                 rsize = READ_REG32(lba_dev->hba.base_addr + LBA_ELMMIO_MASK);
1287                 r->end = r->start + ~rsize;
1288         }
1289 #endif
1290 
1291         r = &(lba_dev->hba.io_space);
1292         sprintf(lba_dev->hba.io_name, "PCI%02x Ports",
1293                                         (int)lba_dev->hba.bus_num.start);
1294         r->name  = lba_dev->hba.io_name;
1295         r->flags = IORESOURCE_IO;
1296         r->start = READ_REG32(lba_dev->hba.base_addr + LBA_IOS_BASE) & ~1L;
1297         r->end   = r->start + (READ_REG32(lba_dev->hba.base_addr + LBA_IOS_MASK) ^ (HBA_PORT_SPACE_SIZE - 1));
1298 
1299         /* Virtualize the I/O Port space ranges */
1300         lba_num = HBA_PORT_BASE(lba_dev->hba.hba_num);
1301         r->start |= lba_num;
1302         r->end   |= lba_num;
1303 }
1304 
1305 
1306 /**************************************************************************
1307 **
1308 **   LBA initialization code (HW and SW)
1309 **
1310 **   o identify LBA chip itself
1311 **   o initialize LBA chip modes (HardFail)
1312 **   o FIXME: initialize DMA hints for reasonable defaults
1313 **   o enable configuration functions
1314 **   o call pci_register_ops() to discover devs (fixup/fixup_bus get invoked)
1315 **
1316 **************************************************************************/
1317 
1318 static int __init
1319 lba_hw_init(struct lba_device *d)
1320 {
1321         u32 stat;
1322         u32 bus_reset;  /* PDC_PAT_BUG */
1323 
1324 #if 0
1325         printk(KERN_DEBUG "LBA %lx  STAT_CTL %Lx  ERROR_CFG %Lx  STATUS %Lx DMA_CTL %Lx\n",
1326                 d->hba.base_addr,
1327                 READ_REG64(d->hba.base_addr + LBA_STAT_CTL),
1328                 READ_REG64(d->hba.base_addr + LBA_ERROR_CONFIG),
1329                 READ_REG64(d->hba.base_addr + LBA_ERROR_STATUS),
1330                 READ_REG64(d->hba.base_addr + LBA_DMA_CTL) );
1331         printk(KERN_DEBUG "     ARB mask %Lx  pri %Lx  mode %Lx  mtlt %Lx\n",
1332                 READ_REG64(d->hba.base_addr + LBA_ARB_MASK),
1333                 READ_REG64(d->hba.base_addr + LBA_ARB_PRI),
1334                 READ_REG64(d->hba.base_addr + LBA_ARB_MODE),
1335                 READ_REG64(d->hba.base_addr + LBA_ARB_MTLT) );
1336         printk(KERN_DEBUG "     HINT cfg 0x%Lx\n",
1337                 READ_REG64(d->hba.base_addr + LBA_HINT_CFG));
1338         printk(KERN_DEBUG "     HINT reg ");
1339         { int i;
1340         for (i=LBA_HINT_BASE; i< (14*8 + LBA_HINT_BASE); i+=8)
1341                 printk(" %Lx", READ_REG64(d->hba.base_addr + i));
1342         }
1343         printk("\n");
1344 #endif  /* DEBUG_LBA_PAT */
1345 
1346 #ifdef CONFIG_64BIT
1347 /*
1348  * FIXME add support for PDC_PAT_IO "Get slot status" - OLAR support
1349  * Only N-Class and up can really make use of Get slot status.
1350  * maybe L-class too but I've never played with it there.
1351  */
1352 #endif
1353 
1354         /* PDC_PAT_BUG: exhibited in rev 40.48  on L2000 */
1355         bus_reset = READ_REG32(d->hba.base_addr + LBA_STAT_CTL + 4) & 1;
1356         if (bus_reset) {
1357                 printk(KERN_DEBUG "NOTICE: PCI bus reset still asserted! (clearing)\n");
1358         }
1359 
1360         stat = READ_REG32(d->hba.base_addr + LBA_ERROR_CONFIG);
1361         if (stat & LBA_SMART_MODE) {
1362                 printk(KERN_DEBUG "NOTICE: LBA in SMART mode! (cleared)\n");
1363                 stat &= ~LBA_SMART_MODE;
1364                 WRITE_REG32(stat, d->hba.base_addr + LBA_ERROR_CONFIG);
1365         }
1366 
1367         /* Set HF mode as the default (vs. -1 mode). */
1368         stat = READ_REG32(d->hba.base_addr + LBA_STAT_CTL);
1369         WRITE_REG32(stat | HF_ENABLE, d->hba.base_addr + LBA_STAT_CTL);
1370 
1371         /*
1372         ** Writing a zero to STAT_CTL.rf (bit 0) will clear reset signal
1373         ** if it's not already set. If we just cleared the PCI Bus Reset
1374         ** signal, wait a bit for the PCI devices to recover and setup.
1375         */
1376         if (bus_reset)
1377                 mdelay(pci_post_reset_delay);
1378 
1379         if (0 == READ_REG32(d->hba.base_addr + LBA_ARB_MASK)) {
1380                 /*
1381                 ** PDC_PAT_BUG: PDC rev 40.48 on L2000.
1382                 ** B2000/C3600/J6000 also have this problem?
1383                 ** 
1384                 ** Elroys with hot pluggable slots don't get configured
1385                 ** correctly if the slot is empty.  ARB_MASK is set to 0
1386                 ** and we can't master transactions on the bus if it's
1387                 ** not at least one. 0x3 enables elroy and first slot.
1388                 */
1389                 printk(KERN_DEBUG "NOTICE: Enabling PCI Arbitration\n");
1390                 WRITE_REG32(0x3, d->hba.base_addr + LBA_ARB_MASK);
1391         }
1392 
1393         /*
1394         ** FIXME: Hint registers are programmed with default hint
1395         ** values by firmware. Hints should be sane even if we
1396         ** can't reprogram them the way drivers want.
1397         */
1398         return 0;
1399 }
1400 
1401 /*
1402  * Unfortunately, when firmware numbers busses, it doesn't take into account
1403  * Cardbus bridges.  So we have to renumber the busses to suit ourselves.
1404  * Elroy/Mercury don't actually know what bus number they're attached to;
1405  * we use bus 0 to indicate the directly attached bus and any other bus
1406  * number will be taken care of by the PCI-PCI bridge.
1407  */
1408 static unsigned int lba_next_bus = 0;
1409 
1410 /*
1411  * Determine if lba should claim this chip (return 0) or not (return 1).
1412  * If so, initialize the chip and tell other partners in crime they
1413  * have work to do.
1414  */
1415 static int __init
1416 lba_driver_probe(struct parisc_device *dev)
1417 {
1418         struct lba_device *lba_dev;
1419         LIST_HEAD(resources);
1420         struct pci_bus *lba_bus;
1421         struct pci_ops *cfg_ops;
1422         u32 func_class;
1423         void *tmp_obj;
1424         char *version;
1425         void __iomem *addr = ioremap_nocache(dev->hpa.start, 4096);
1426         int max;
1427 
1428         /* Read HW Rev First */
1429         func_class = READ_REG32(addr + LBA_FCLASS);
1430 
1431         if (IS_ELROY(dev)) {    
1432                 func_class &= 0xf;
1433                 switch (func_class) {
1434                 case 0: version = "TR1.0"; break;
1435                 case 1: version = "TR2.0"; break;
1436                 case 2: version = "TR2.1"; break;
1437                 case 3: version = "TR2.2"; break;
1438                 case 4: version = "TR3.0"; break;
1439                 case 5: version = "TR4.0"; break;
1440                 default: version = "TR4+";
1441                 }
1442 
1443                 printk(KERN_INFO "Elroy version %s (0x%x) found at 0x%lx\n",
1444                        version, func_class & 0xf, (long)dev->hpa.start);
1445 
1446                 if (func_class < 2) {
1447                         printk(KERN_WARNING "Can't support LBA older than "
1448                                 "TR2.1 - continuing under adversity.\n");
1449                 }
1450 
1451 #if 0
1452 /* Elroy TR4.0 should work with simple algorithm.
1453    But it doesn't.  Still missing something. *sigh*
1454 */
1455                 if (func_class > 4) {
1456                         cfg_ops = &mercury_cfg_ops;
1457                 } else
1458 #endif
1459                 {
1460                         cfg_ops = &elroy_cfg_ops;
1461                 }
1462 
1463         } else if (IS_MERCURY(dev) || IS_QUICKSILVER(dev)) {
1464                 int major, minor;
1465 
1466                 func_class &= 0xff;
1467                 major = func_class >> 4, minor = func_class & 0xf;
1468 
1469                 /* We could use one printk for both Elroy and Mercury,
1470                  * but for the mask for func_class.
1471                  */ 
1472                 printk(KERN_INFO "%s version TR%d.%d (0x%x) found at 0x%lx\n",
1473                        IS_MERCURY(dev) ? "Mercury" : "Quicksilver", major,
1474                        minor, func_class, (long)dev->hpa.start);
1475 
1476                 cfg_ops = &mercury_cfg_ops;
1477         } else {
1478                 printk(KERN_ERR "Unknown LBA found at 0x%lx\n",
1479                         (long)dev->hpa.start);
1480                 return -ENODEV;
1481         }
1482 
1483         /* Tell I/O SAPIC driver we have a IRQ handler/region. */
1484         tmp_obj = iosapic_register(dev->hpa.start + LBA_IOSAPIC_BASE);
1485 
1486         /* NOTE: PCI devices (e.g. 103c:1005 graphics card) which don't
1487         **      have an IRT entry will get NULL back from iosapic code.
1488         */
1489         
1490         lba_dev = kzalloc(sizeof(struct lba_device), GFP_KERNEL);
1491         if (!lba_dev) {
1492                 printk(KERN_ERR "lba_init_chip - couldn't alloc lba_device\n");
1493                 return(1);
1494         }
1495 
1496 
1497         /* ---------- First : initialize data we already have --------- */
1498 
1499         lba_dev->hw_rev = func_class;
1500         lba_dev->hba.base_addr = addr;
1501         lba_dev->hba.dev = dev;
1502         lba_dev->iosapic_obj = tmp_obj;  /* save interrupt handle */
1503         lba_dev->hba.iommu = sba_get_iommu(dev);  /* get iommu data */
1504         parisc_set_drvdata(dev, lba_dev);
1505 
1506         /* ------------ Second : initialize common stuff ---------- */
1507         pci_bios = &lba_bios_ops;
1508         pcibios_register_hba(HBA_DATA(lba_dev));
1509         spin_lock_init(&lba_dev->lba_lock);
1510 
1511         if (lba_hw_init(lba_dev))
1512                 return(1);
1513 
1514         /* ---------- Third : setup I/O Port and MMIO resources  --------- */
1515 
1516         if (is_pdc_pat()) {
1517                 /* PDC PAT firmware uses PIOP region of GMMIO space. */
1518                 pci_port = &lba_pat_port_ops;
1519                 /* Go ask PDC PAT what resources this LBA has */
1520                 lba_pat_resources(dev, lba_dev);
1521         } else {
1522                 if (!astro_iop_base) {
1523                         /* Sprockets PDC uses NPIOP region */
1524                         astro_iop_base = ioremap_nocache(LBA_PORT_BASE, 64 * 1024);
1525                         pci_port = &lba_astro_port_ops;
1526                 }
1527 
1528                 /* Poke the chip a bit for /proc output */
1529                 lba_legacy_resources(dev, lba_dev);
1530         }
1531 
1532         if (lba_dev->hba.bus_num.start < lba_next_bus)
1533                 lba_dev->hba.bus_num.start = lba_next_bus;
1534 
1535         /*   Overlaps with elmmio can (and should) fail here.
1536          *   We will prune (or ignore) the distributed range.
1537          *
1538          *   FIXME: SBA code should register all elmmio ranges first.
1539          *      that would take care of elmmio ranges routed
1540          *      to a different rope (already discovered) from
1541          *      getting registered *after* LBA code has already
1542          *      registered it's distributed lmmio range.
1543          */
1544         if (truncate_pat_collision(&iomem_resource,
1545                                    &(lba_dev->hba.lmmio_space))) {
1546                 printk(KERN_WARNING "LBA: lmmio_space [%lx/%lx] duplicate!\n",
1547                                 (long)lba_dev->hba.lmmio_space.start,
1548                                 (long)lba_dev->hba.lmmio_space.end);
1549                 lba_dev->hba.lmmio_space.flags = 0;
1550         }
1551 
1552         pci_add_resource_offset(&resources, &lba_dev->hba.io_space,
1553                                 HBA_PORT_BASE(lba_dev->hba.hba_num));
1554         if (lba_dev->hba.elmmio_space.flags)
1555                 pci_add_resource_offset(&resources, &lba_dev->hba.elmmio_space,
1556                                         lba_dev->hba.lmmio_space_offset);
1557         if (lba_dev->hba.lmmio_space.flags)
1558                 pci_add_resource_offset(&resources, &lba_dev->hba.lmmio_space,
1559                                         lba_dev->hba.lmmio_space_offset);
1560         if (lba_dev->hba.gmmio_space.flags)
1561                 pci_add_resource(&resources, &lba_dev->hba.gmmio_space);
1562 
1563         pci_add_resource(&resources, &lba_dev->hba.bus_num);
1564 
1565         dev->dev.platform_data = lba_dev;
1566         lba_bus = lba_dev->hba.hba_bus =
1567                 pci_create_root_bus(&dev->dev, lba_dev->hba.bus_num.start,
1568                                     cfg_ops, NULL, &resources);
1569         if (!lba_bus) {
1570                 pci_free_resource_list(&resources);
1571                 return 0;
1572         }
1573 
1574         max = pci_scan_child_bus(lba_bus);
1575 
1576         /* This is in lieu of calling pci_assign_unassigned_resources() */
1577         if (is_pdc_pat()) {
1578                 /* assign resources to un-initialized devices */
1579 
1580                 DBG_PAT("LBA pci_bus_size_bridges()\n");
1581                 pci_bus_size_bridges(lba_bus);
1582 
1583                 DBG_PAT("LBA pci_bus_assign_resources()\n");
1584                 pci_bus_assign_resources(lba_bus);
1585 
1586 #ifdef DEBUG_LBA_PAT
1587                 DBG_PAT("\nLBA PIOP resource tree\n");
1588                 lba_dump_res(&lba_dev->hba.io_space, 2);
1589                 DBG_PAT("\nLBA LMMIO resource tree\n");
1590                 lba_dump_res(&lba_dev->hba.lmmio_space, 2);
1591 #endif
1592         }
1593 
1594         /*
1595         ** Once PCI register ops has walked the bus, access to config
1596         ** space is restricted. Avoids master aborts on config cycles.
1597         ** Early LBA revs go fatal on *any* master abort.
1598         */
1599         if (cfg_ops == &elroy_cfg_ops) {
1600                 lba_dev->flags |= LBA_FLAG_SKIP_PROBE;
1601         }
1602 
1603         lba_next_bus = max + 1;
1604         pci_bus_add_devices(lba_bus);
1605 
1606         /* Whew! Finally done! Tell services we got this one covered. */
1607         return 0;
1608 }
1609 
1610 static struct parisc_device_id lba_tbl[] = {
1611         { HPHW_BRIDGE, HVERSION_REV_ANY_ID, ELROY_HVERS, 0xa },
1612         { HPHW_BRIDGE, HVERSION_REV_ANY_ID, MERCURY_HVERS, 0xa },
1613         { HPHW_BRIDGE, HVERSION_REV_ANY_ID, QUICKSILVER_HVERS, 0xa },
1614         { 0, }
1615 };
1616 
1617 static struct parisc_driver lba_driver = {
1618         .name =         MODULE_NAME,
1619         .id_table =     lba_tbl,
1620         .probe =        lba_driver_probe,
1621 };
1622 
1623 /*
1624 ** One time initialization to let the world know the LBA was found.
1625 ** Must be called exactly once before pci_init().
1626 */
1627 void __init lba_init(void)
1628 {
1629         register_parisc_driver(&lba_driver);
1630 }
1631 
1632 /*
1633 ** Initialize the IBASE/IMASK registers for LBA (Elroy).
1634 ** Only called from sba_iommu.c in order to route ranges (MMIO vs DMA).
1635 ** sba_iommu is responsible for locking (none needed at init time).
1636 */
1637 void lba_set_iregs(struct parisc_device *lba, u32 ibase, u32 imask)
1638 {
1639         void __iomem * base_addr = ioremap_nocache(lba->hpa.start, 4096);
1640 
1641         imask <<= 2;    /* adjust for hints - 2 more bits */
1642 
1643         /* Make sure we aren't trying to set bits that aren't writeable. */
1644         WARN_ON((ibase & 0x001fffff) != 0);
1645         WARN_ON((imask & 0x001fffff) != 0);
1646         
1647         DBG("%s() ibase 0x%x imask 0x%x\n", __func__, ibase, imask);
1648         WRITE_REG32( imask, base_addr + LBA_IMASK);
1649         WRITE_REG32( ibase, base_addr + LBA_IBASE);
1650         iounmap(base_addr);
1651 }
1652 
1653 

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