2 ** System Bus Adapter (SBA) I/O MMU manager
4 ** (c) Copyright 2000-2004 Grant Grundler <grundler @ parisc-linux x org>
5 ** (c) Copyright 2004 Naresh Kumar Inna <knaresh at india x hp x com>
6 ** (c) Copyright 2000-2004 Hewlett-Packard Company
8 ** Portions (c) 1999 Dave S. Miller (from sparc64 I/O MMU code)
10 ** This program is free software; you can redistribute it and/or modify
11 ** it under the terms of the GNU General Public License as published by
12 ** the Free Software Foundation; either version 2 of the License, or
13 ** (at your option) any later version.
16 ** This module initializes the IOC (I/O Controller) found on B1000/C3000/
17 ** J5000/J7000/N-class/L-class machines and their successors.
19 ** FIXME: add DMA hint support programming in both sba and lba modules.
22 #include <linux/types.h>
23 #include <linux/kernel.h>
24 #include <linux/spinlock.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/pci.h>
31 #include <linux/scatterlist.h>
33 #include <asm/byteorder.h>
35 #include <asm/dma.h> /* for DMA_CHUNK_SIZE */
37 #include <asm/hardware.h> /* for register_parisc_driver() stuff */
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
42 #include <asm/ropes.h>
43 #include <asm/mckinley.h> /* for proc_mckinley_root */
44 #include <asm/runway.h> /* for proc_runway_root */
45 #include <asm/pdc.h> /* for PDC_MODEL_* */
46 #include <asm/pdcpat.h> /* for is_pdc_pat() */
47 #include <asm/parisc-device.h>
49 #define MODULE_NAME "SBA"
52 ** The number of debug flags is a clue - this code is fragile.
53 ** Don't even think about messing with it unless you have
54 ** plenty of 710's to sacrifice to the computer gods. :^)
58 #undef DEBUG_SBA_RUN_SG
59 #undef DEBUG_SBA_RESOURCE
60 #undef ASSERT_PDIR_SANITY
61 #undef DEBUG_LARGE_SG_ENTRIES
65 #define DBG_INIT(x...) printk(x)
67 #define DBG_INIT(x...)
71 #define DBG_RUN(x...) printk(x)
76 #ifdef DEBUG_SBA_RUN_SG
77 #define DBG_RUN_SG(x...) printk(x)
79 #define DBG_RUN_SG(x...)
83 #ifdef DEBUG_SBA_RESOURCE
84 #define DBG_RES(x...) printk(x)
89 #define SBA_INLINE __inline__
91 #define DEFAULT_DMA_HINT_REG 0
93 struct sba_device *sba_list;
94 EXPORT_SYMBOL_GPL(sba_list);
96 static unsigned long ioc_needs_fdc = 0;
98 /* global count of IOMMUs in the system */
99 static unsigned int global_ioc_cnt = 0;
101 /* PA8700 (Piranha 2.2) bug workaround */
102 static unsigned long piranha_bad_128k = 0;
104 /* Looks nice and keeps the compiler happy */
105 #define SBA_DEV(d) ((struct sba_device *) (d))
107 #ifdef CONFIG_AGP_PARISC
108 #define SBA_AGP_SUPPORT
109 #endif /*CONFIG_AGP_PARISC*/
111 #ifdef SBA_AGP_SUPPORT
112 static int sba_reserve_agpgart = 1;
113 module_param(sba_reserve_agpgart, int, 0444);
114 MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART");
118 /************************************
119 ** SBA register read and write support
121 ** BE WARNED: register writes are posted.
122 ** (ie follow writes which must reach HW with a read)
124 ** Superdome (in particular, REO) allows only 64-bit CSR accesses.
126 #define READ_REG32(addr) readl(addr)
127 #define READ_REG64(addr) readq(addr)
128 #define WRITE_REG32(val, addr) writel((val), (addr))
129 #define WRITE_REG64(val, addr) writeq((val), (addr))
132 #define READ_REG(addr) READ_REG64(addr)
133 #define WRITE_REG(value, addr) WRITE_REG64(value, addr)
135 #define READ_REG(addr) READ_REG32(addr)
136 #define WRITE_REG(value, addr) WRITE_REG32(value, addr)
139 #ifdef DEBUG_SBA_INIT
141 /* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */
144 * sba_dump_ranges - debugging only - print ranges assigned to this IOA
145 * @hpa: base address of the sba
147 * Print the MMIO and IO Port address ranges forwarded by an Astro/Ike/RIO
148 * IO Adapter (aka Bus Converter).
151 sba_dump_ranges(void __iomem *hpa)
153 DBG_INIT("SBA at 0x%p\n", hpa);
154 DBG_INIT("IOS_DIST_BASE : %Lx\n", READ_REG64(hpa+IOS_DIST_BASE));
155 DBG_INIT("IOS_DIST_MASK : %Lx\n", READ_REG64(hpa+IOS_DIST_MASK));
156 DBG_INIT("IOS_DIST_ROUTE : %Lx\n", READ_REG64(hpa+IOS_DIST_ROUTE));
158 DBG_INIT("IOS_DIRECT_BASE : %Lx\n", READ_REG64(hpa+IOS_DIRECT_BASE));
159 DBG_INIT("IOS_DIRECT_MASK : %Lx\n", READ_REG64(hpa+IOS_DIRECT_MASK));
160 DBG_INIT("IOS_DIRECT_ROUTE: %Lx\n", READ_REG64(hpa+IOS_DIRECT_ROUTE));
164 * sba_dump_tlb - debugging only - print IOMMU operating parameters
165 * @hpa: base address of the IOMMU
167 * Print the size/location of the IO MMU PDIR.
169 static void sba_dump_tlb(void __iomem *hpa)
171 DBG_INIT("IO TLB at 0x%p\n", hpa);
172 DBG_INIT("IOC_IBASE : 0x%Lx\n", READ_REG64(hpa+IOC_IBASE));
173 DBG_INIT("IOC_IMASK : 0x%Lx\n", READ_REG64(hpa+IOC_IMASK));
174 DBG_INIT("IOC_TCNFG : 0x%Lx\n", READ_REG64(hpa+IOC_TCNFG));
175 DBG_INIT("IOC_PDIR_BASE: 0x%Lx\n", READ_REG64(hpa+IOC_PDIR_BASE));
179 #define sba_dump_ranges(x)
180 #define sba_dump_tlb(x)
181 #endif /* DEBUG_SBA_INIT */
184 #ifdef ASSERT_PDIR_SANITY
187 * sba_dump_pdir_entry - debugging only - print one IOMMU PDIR entry
188 * @ioc: IO MMU structure which owns the pdir we are interested in.
189 * @msg: text to print ont the output line.
192 * Print one entry of the IO MMU PDIR in human readable form.
195 sba_dump_pdir_entry(struct ioc *ioc, char *msg, uint pide)
197 /* start printing from lowest pde in rval */
198 u64 *ptr = &(ioc->pdir_base[pide & (~0U * BITS_PER_LONG)]);
199 unsigned long *rptr = (unsigned long *) &(ioc->res_map[(pide >>3) & ~(sizeof(unsigned long) - 1)]);
202 printk(KERN_DEBUG "SBA: %s rp %p bit %d rval 0x%lx\n",
204 rptr, pide & (BITS_PER_LONG - 1), *rptr);
207 while (rcnt < BITS_PER_LONG) {
208 printk(KERN_DEBUG "%s %2d %p %016Lx\n",
209 (rcnt == (pide & (BITS_PER_LONG - 1)))
215 printk(KERN_DEBUG "%s", msg);
220 * sba_check_pdir - debugging only - consistency checker
221 * @ioc: IO MMU structure which owns the pdir we are interested in.
222 * @msg: text to print ont the output line.
224 * Verify the resource map and pdir state is consistent
227 sba_check_pdir(struct ioc *ioc, char *msg)
229 u32 *rptr_end = (u32 *) &(ioc->res_map[ioc->res_size]);
230 u32 *rptr = (u32 *) ioc->res_map; /* resource map ptr */
231 u64 *pptr = ioc->pdir_base; /* pdir ptr */
234 while (rptr < rptr_end) {
236 int rcnt = 32; /* number of bits we might check */
239 /* Get last byte and highest bit from that */
240 u32 pde = ((u32) (((char *)pptr)[7])) << 24;
241 if ((rval ^ pde) & 0x80000000)
244 ** BUMMER! -- res_map != pdir --
245 ** Dump rval and matching pdir entries
247 sba_dump_pdir_entry(ioc, msg, pide);
251 rval <<= 1; /* try the next bit */
255 rptr++; /* look at next word of res_map */
257 /* It'd be nice if we always got here :^) */
263 * sba_dump_sg - debugging only - print Scatter-Gather list
264 * @ioc: IO MMU structure which owns the pdir we are interested in.
265 * @startsg: head of the SG list
266 * @nents: number of entries in SG list
268 * print the SG list so we can verify it's correct by hand.
271 sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
273 while (nents-- > 0) {
274 printk(KERN_DEBUG " %d : %08lx/%05x %p/%05x\n",
276 (unsigned long) sg_dma_address(startsg),
278 sg_virt_addr(startsg), startsg->length);
283 #endif /* ASSERT_PDIR_SANITY */
288 /**************************************************************
290 * I/O Pdir Resource Management
292 * Bits set in the resource map are in use.
293 * Each bit can represent a number of pages.
294 * LSbs represent lower addresses (IOVA's).
296 ***************************************************************/
297 #define PAGES_PER_RANGE 1 /* could increase this to 4 or 8 if needed */
299 /* Convert from IOVP to IOVA and vice versa. */
302 /* Pluto (aka ZX1) boxes need to set or clear the ibase bits appropriately */
303 #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((ioc->ibase) | (iovp) | (offset))
304 #define SBA_IOVP(ioc,iova) ((iova) & (ioc)->iovp_mask)
306 /* only support Astro and ancestors. Saves a few cycles in key places */
307 #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset))
308 #define SBA_IOVP(ioc,iova) (iova)
311 #define PDIR_INDEX(iovp) ((iovp)>>IOVP_SHIFT)
313 #define RESMAP_MASK(n) (~0UL << (BITS_PER_LONG - (n)))
314 #define RESMAP_IDX_MASK (sizeof(unsigned long) - 1)
318 * sba_search_bitmap - find free space in IO PDIR resource bitmap
319 * @ioc: IO MMU structure which owns the pdir we are interested in.
320 * @bits_wanted: number of entries we need.
322 * Find consecutive free bits in resource bitmap.
323 * Each bit represents one entry in the IO Pdir.
324 * Cool perf optimization: search for log2(size) bits at a time.
326 static SBA_INLINE unsigned long
327 sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted)
329 unsigned long *res_ptr = ioc->res_hint;
330 unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
331 unsigned long pide = ~0UL;
333 if (bits_wanted > (BITS_PER_LONG/2)) {
334 /* Search word at a time - no mask needed */
335 for(; res_ptr < res_end; ++res_ptr) {
337 *res_ptr = RESMAP_MASK(bits_wanted);
338 pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map);
339 pide <<= 3; /* convert to bit address */
343 /* point to the next word on next pass */
345 ioc->res_bitshift = 0;
348 ** Search the resource bit map on well-aligned values.
349 ** "o" is the alignment.
350 ** We need the alignment to invalidate I/O TLB using
351 ** SBA HW features in the unmap path.
353 unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT);
354 uint bitshiftcnt = ALIGN(ioc->res_bitshift, o);
357 if (bitshiftcnt >= BITS_PER_LONG) {
361 mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;
363 DBG_RES("%s() o %ld %p", __FUNCTION__, o, res_ptr);
364 while(res_ptr < res_end)
366 DBG_RES(" %p %lx %lx\n", res_ptr, mask, *res_ptr);
368 if(((*res_ptr) & mask) == 0) {
369 *res_ptr |= mask; /* mark resources busy! */
370 pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map);
371 pide <<= 3; /* convert to bit address */
378 mask = RESMAP_MASK(bits_wanted);
383 /* look in the same word on the next pass */
384 ioc->res_bitshift = bitshiftcnt + bits_wanted;
388 if (res_end <= res_ptr) {
389 ioc->res_hint = (unsigned long *) ioc->res_map;
390 ioc->res_bitshift = 0;
392 ioc->res_hint = res_ptr;
399 * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
400 * @ioc: IO MMU structure which owns the pdir we are interested in.
401 * @size: number of bytes to create a mapping for
403 * Given a size, find consecutive unmarked and then mark those bits in the
407 sba_alloc_range(struct ioc *ioc, size_t size)
409 unsigned int pages_needed = size >> IOVP_SHIFT;
410 #ifdef SBA_COLLECT_STATS
411 unsigned long cr_start = mfctl(16);
415 pide = sba_search_bitmap(ioc, pages_needed);
416 if (pide >= (ioc->res_size << 3)) {
417 pide = sba_search_bitmap(ioc, pages_needed);
418 if (pide >= (ioc->res_size << 3))
419 panic("%s: I/O MMU @ %p is out of mapping resources\n",
420 __FILE__, ioc->ioc_hpa);
423 #ifdef ASSERT_PDIR_SANITY
424 /* verify the first enable bit is clear */
425 if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) {
426 sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
430 DBG_RES("%s(%x) %d -> %lx hint %x/%x\n",
431 __FUNCTION__, size, pages_needed, pide,
432 (uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
435 #ifdef SBA_COLLECT_STATS
437 unsigned long cr_end = mfctl(16);
438 unsigned long tmp = cr_end - cr_start;
439 /* check for roll over */
440 cr_start = (cr_end < cr_start) ? -(tmp) : (tmp);
442 ioc->avg_search[ioc->avg_idx++] = cr_start;
443 ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
445 ioc->used_pages += pages_needed;
453 * sba_free_range - unmark bits in IO PDIR resource bitmap
454 * @ioc: IO MMU structure which owns the pdir we are interested in.
455 * @iova: IO virtual address which was previously allocated.
456 * @size: number of bytes to create a mapping for
458 * clear bits in the ioc's resource map
460 static SBA_INLINE void
461 sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
463 unsigned long iovp = SBA_IOVP(ioc, iova);
464 unsigned int pide = PDIR_INDEX(iovp);
465 unsigned int ridx = pide >> 3; /* convert bit to byte address */
466 unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
468 int bits_not_wanted = size >> IOVP_SHIFT;
470 /* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
471 unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
473 DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n",
474 __FUNCTION__, (uint) iova, size,
475 bits_not_wanted, m, pide, res_ptr, *res_ptr);
477 #ifdef SBA_COLLECT_STATS
478 ioc->used_pages -= bits_not_wanted;
485 /**************************************************************
487 * "Dynamic DMA Mapping" support (aka "Coherent I/O")
489 ***************************************************************/
491 #ifdef SBA_HINT_SUPPORT
492 #define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
495 typedef unsigned long space_t;
496 #define KERNEL_SPACE 0
499 * sba_io_pdir_entry - fill in one IO PDIR entry
500 * @pdir_ptr: pointer to IO PDIR entry
501 * @sid: process Space ID - currently only support KERNEL_SPACE
502 * @vba: Virtual CPU address of buffer to map
503 * @hint: DMA hint set to use for this mapping
505 * SBA Mapping Routine
507 * Given a virtual address (vba, arg2) and space id, (sid, arg1)
508 * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
510 * Using the bass-ackwards HP bit numbering, Each IO Pdir entry
511 * for Astro/Ike looks like:
515 * +-+---------------------+----------------------------------+----+--------+
516 * |V| U | PPN[43:12] | U | VI |
517 * +-+---------------------+----------------------------------+----+--------+
519 * Pluto is basically identical, supports fewer physical address bits:
522 * +-+------------------------+-------------------------------+----+--------+
523 * |V| U | PPN[39:12] | U | VI |
524 * +-+------------------------+-------------------------------+----+--------+
526 * V == Valid Bit (Most Significant Bit is bit 0)
528 * PPN == Physical Page Number
529 * VI == Virtual Index (aka Coherent Index)
531 * LPA instruction output is put into PPN field.
532 * LCI (Load Coherence Index) instruction provides the "VI" bits.
534 * We pre-swap the bytes since PCX-W is Big Endian and the
535 * IOMMU uses little endian for the pdir.
539 sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
542 u64 pa; /* physical address */
543 register unsigned ci; /* coherent index */
545 pa = virt_to_phys(vba);
549 asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
550 pa |= (ci >> 12) & 0xff; /* move CI (8 bits) into lowest byte */
552 pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */
553 *pdir_ptr = cpu_to_le64(pa); /* swap and store into I/O Pdir */
556 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
557 * (bit #61, big endian), we have to flush and sync every time
558 * IO-PDIR is changed in Ike/Astro.
561 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
566 * sba_mark_invalid - invalidate one or more IO PDIR entries
567 * @ioc: IO MMU structure which owns the pdir we are interested in.
568 * @iova: IO Virtual Address mapped earlier
569 * @byte_cnt: number of bytes this mapping covers.
571 * Marking the IO PDIR entry(ies) as Invalid and invalidate
572 * corresponding IO TLB entry. The Ike PCOM (Purge Command Register)
573 * is to purge stale entries in the IO TLB when unmapping entries.
575 * The PCOM register supports purging of multiple pages, with a minium
576 * of 1 page and a maximum of 2GB. Hardware requires the address be
577 * aligned to the size of the range being purged. The size of the range
578 * must be a power of 2. The "Cool perf optimization" in the
579 * allocation routine helps keep that true.
581 static SBA_INLINE void
582 sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
584 u32 iovp = (u32) SBA_IOVP(ioc,iova);
585 u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
587 #ifdef ASSERT_PDIR_SANITY
588 /* Assert first pdir entry is set.
590 ** Even though this is a big-endian machine, the entries
591 ** in the iopdir are little endian. That's why we look at
592 ** the byte at +7 instead of at +0.
594 if (0x80 != (((u8 *) pdir_ptr)[7])) {
595 sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
599 if (byte_cnt > IOVP_SIZE)
602 unsigned long entries_per_cacheline = ioc_needs_fdc ?
603 L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
604 - (unsigned long) pdir_ptr;
608 /* set "size" field for PCOM */
609 iovp |= get_order(byte_cnt) + PAGE_SHIFT;
612 /* clear I/O Pdir entry "valid" bit first */
613 ((u8 *) pdir_ptr)[7] = 0;
615 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
617 entries_per_cacheline = L1_CACHE_SHIFT - 3;
621 byte_cnt -= IOVP_SIZE;
622 } while (byte_cnt > IOVP_SIZE);
624 iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
627 ** clear I/O PDIR entry "valid" bit.
628 ** We have to R/M/W the cacheline regardless how much of the
629 ** pdir entry that we clobber.
630 ** The rest of the entry would be useful for debugging if we
631 ** could dump core on HPMC.
633 ((u8 *) pdir_ptr)[7] = 0;
635 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
637 WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
641 * sba_dma_supported - PCI driver can query DMA support
642 * @dev: instance of PCI owned by the driver that's asking
643 * @mask: number of address bits this PCI device can handle
645 * See Documentation/DMA-mapping.txt
647 static int sba_dma_supported( struct device *dev, u64 mask)
652 printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
657 /* Documentation/DMA-mapping.txt tells drivers to try 64-bit first,
658 * then fall back to 32-bit if that fails.
659 * We are just "encouraging" 32-bit DMA masks here since we can
660 * never allow IOMMU bypass unless we add special support for ZX1.
668 * check if mask is >= than the current max IO Virt Address
669 * The max IO Virt address will *always* < 30 bits.
671 return((int)(mask >= (ioc->ibase - 1 +
672 (ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
677 * sba_map_single - map one buffer and return IOVA for DMA
678 * @dev: instance of PCI owned by the driver that's asking.
679 * @addr: driver buffer to map.
680 * @size: number of bytes to map in driver buffer.
681 * @direction: R/W or both.
683 * See Documentation/DMA-mapping.txt
686 sba_map_single(struct device *dev, void *addr, size_t size,
687 enum dma_data_direction direction)
698 /* save offset bits */
699 offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
701 /* round up to nearest IOVP_SIZE */
702 size = (size + offset + ~IOVP_MASK) & IOVP_MASK;
704 spin_lock_irqsave(&ioc->res_lock, flags);
705 #ifdef ASSERT_PDIR_SANITY
706 sba_check_pdir(ioc,"Check before sba_map_single()");
709 #ifdef SBA_COLLECT_STATS
710 ioc->msingle_calls++;
711 ioc->msingle_pages += size >> IOVP_SHIFT;
713 pide = sba_alloc_range(ioc, size);
714 iovp = (dma_addr_t) pide << IOVP_SHIFT;
716 DBG_RUN("%s() 0x%p -> 0x%lx\n",
717 __FUNCTION__, addr, (long) iovp | offset);
719 pdir_start = &(ioc->pdir_base[pide]);
722 sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr, 0);
724 DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x\n",
726 (u8) (((u8 *) pdir_start)[7]),
727 (u8) (((u8 *) pdir_start)[6]),
728 (u8) (((u8 *) pdir_start)[5]),
729 (u8) (((u8 *) pdir_start)[4]),
730 (u8) (((u8 *) pdir_start)[3]),
731 (u8) (((u8 *) pdir_start)[2]),
732 (u8) (((u8 *) pdir_start)[1]),
733 (u8) (((u8 *) pdir_start)[0])
741 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
743 asm volatile("sync" : : );
745 #ifdef ASSERT_PDIR_SANITY
746 sba_check_pdir(ioc,"Check after sba_map_single()");
748 spin_unlock_irqrestore(&ioc->res_lock, flags);
750 /* form complete address */
751 return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
756 * sba_unmap_single - unmap one IOVA and free resources
757 * @dev: instance of PCI owned by the driver that's asking.
758 * @iova: IOVA of driver buffer previously mapped.
759 * @size: number of bytes mapped in driver buffer.
760 * @direction: R/W or both.
762 * See Documentation/DMA-mapping.txt
765 sba_unmap_single(struct device *dev, dma_addr_t iova, size_t size,
766 enum dma_data_direction direction)
769 #if DELAYED_RESOURCE_CNT > 0
770 struct sba_dma_pair *d;
775 DBG_RUN("%s() iovp 0x%lx/%x\n", __FUNCTION__, (long) iova, size);
778 offset = iova & ~IOVP_MASK;
779 iova ^= offset; /* clear offset bits */
781 size = ALIGN(size, IOVP_SIZE);
783 spin_lock_irqsave(&ioc->res_lock, flags);
785 #ifdef SBA_COLLECT_STATS
786 ioc->usingle_calls++;
787 ioc->usingle_pages += size >> IOVP_SHIFT;
790 sba_mark_invalid(ioc, iova, size);
792 #if DELAYED_RESOURCE_CNT > 0
793 /* Delaying when we re-use a IO Pdir entry reduces the number
794 * of MMIO reads needed to flush writes to the PCOM register.
796 d = &(ioc->saved[ioc->saved_cnt]);
799 if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
800 int cnt = ioc->saved_cnt;
802 sba_free_range(ioc, d->iova, d->size);
807 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
809 #else /* DELAYED_RESOURCE_CNT == 0 */
810 sba_free_range(ioc, iova, size);
812 /* If fdc's were issued, force fdc's to be visible now */
814 asm volatile("sync" : : );
816 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
817 #endif /* DELAYED_RESOURCE_CNT == 0 */
819 spin_unlock_irqrestore(&ioc->res_lock, flags);
821 /* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
822 ** For Astro based systems this isn't a big deal WRT performance.
823 ** As long as 2.4 kernels copyin/copyout data from/to userspace,
824 ** we don't need the syncdma. The issue here is I/O MMU cachelines
825 ** are *not* coherent in all cases. May be hwrev dependent.
826 ** Need to investigate more.
827 asm volatile("syncdma");
833 * sba_alloc_consistent - allocate/map shared mem for DMA
834 * @hwdev: instance of PCI owned by the driver that's asking.
835 * @size: number of bytes mapped in driver buffer.
836 * @dma_handle: IOVA of new buffer.
838 * See Documentation/DMA-mapping.txt
840 static void *sba_alloc_consistent(struct device *hwdev, size_t size,
841 dma_addr_t *dma_handle, gfp_t gfp)
846 /* only support PCI */
851 ret = (void *) __get_free_pages(gfp, get_order(size));
854 memset(ret, 0, size);
855 *dma_handle = sba_map_single(hwdev, ret, size, 0);
863 * sba_free_consistent - free/unmap shared mem for DMA
864 * @hwdev: instance of PCI owned by the driver that's asking.
865 * @size: number of bytes mapped in driver buffer.
866 * @vaddr: virtual address IOVA of "consistent" buffer.
867 * @dma_handler: IO virtual address of "consistent" buffer.
869 * See Documentation/DMA-mapping.txt
872 sba_free_consistent(struct device *hwdev, size_t size, void *vaddr,
873 dma_addr_t dma_handle)
875 sba_unmap_single(hwdev, dma_handle, size, 0);
876 free_pages((unsigned long) vaddr, get_order(size));
881 ** Since 0 is a valid pdir_base index value, can't use that
882 ** to determine if a value is valid or not. Use a flag to indicate
883 ** the SG list entry contains a valid pdir index.
885 #define PIDE_FLAG 0x80000000UL
887 #ifdef SBA_COLLECT_STATS
888 #define IOMMU_MAP_STATS
890 #include "iommu-helpers.h"
892 #ifdef DEBUG_LARGE_SG_ENTRIES
898 * sba_map_sg - map Scatter/Gather list
899 * @dev: instance of PCI owned by the driver that's asking.
900 * @sglist: array of buffer/length pairs
901 * @nents: number of entries in list
902 * @direction: R/W or both.
904 * See Documentation/DMA-mapping.txt
907 sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
908 enum dma_data_direction direction)
911 int coalesced, filled = 0;
914 DBG_RUN_SG("%s() START %d entries\n", __FUNCTION__, nents);
918 /* Fast path single entry scatterlists. */
920 sg_dma_address(sglist) = sba_map_single(dev,
921 (void *)sg_virt_addr(sglist),
922 sglist->length, direction);
923 sg_dma_len(sglist) = sglist->length;
927 spin_lock_irqsave(&ioc->res_lock, flags);
929 #ifdef ASSERT_PDIR_SANITY
930 if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
932 sba_dump_sg(ioc, sglist, nents);
933 panic("Check before sba_map_sg()");
937 #ifdef SBA_COLLECT_STATS
942 ** First coalesce the chunks and allocate I/O pdir space
944 ** If this is one DMA stream, we can properly map using the
945 ** correct virtual address associated with each DMA page.
946 ** w/o this association, we wouldn't have coherent DMA!
947 ** Access to the virtual address is what forces a two pass algorithm.
949 coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range);
952 ** Program the I/O Pdir
954 ** map the virtual addresses to the I/O Pdir
955 ** o dma_address will contain the pdir index
956 ** o dma_len will contain the number of bytes to map
957 ** o address contains the virtual address.
959 filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry);
961 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
963 asm volatile("sync" : : );
965 #ifdef ASSERT_PDIR_SANITY
966 if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
968 sba_dump_sg(ioc, sglist, nents);
969 panic("Check after sba_map_sg()\n");
973 spin_unlock_irqrestore(&ioc->res_lock, flags);
975 DBG_RUN_SG("%s() DONE %d mappings\n", __FUNCTION__, filled);
982 * sba_unmap_sg - unmap Scatter/Gather list
983 * @dev: instance of PCI owned by the driver that's asking.
984 * @sglist: array of buffer/length pairs
985 * @nents: number of entries in list
986 * @direction: R/W or both.
988 * See Documentation/DMA-mapping.txt
991 sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
992 enum dma_data_direction direction)
995 #ifdef ASSERT_PDIR_SANITY
999 DBG_RUN_SG("%s() START %d entries, %p,%x\n",
1000 __FUNCTION__, nents, sg_virt_addr(sglist), sglist->length);
1004 #ifdef SBA_COLLECT_STATS
1008 #ifdef ASSERT_PDIR_SANITY
1009 spin_lock_irqsave(&ioc->res_lock, flags);
1010 sba_check_pdir(ioc,"Check before sba_unmap_sg()");
1011 spin_unlock_irqrestore(&ioc->res_lock, flags);
1014 while (sg_dma_len(sglist) && nents--) {
1016 sba_unmap_single(dev, sg_dma_address(sglist), sg_dma_len(sglist), direction);
1017 #ifdef SBA_COLLECT_STATS
1018 ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT;
1019 ioc->usingle_calls--; /* kluge since call is unmap_sg() */
1024 DBG_RUN_SG("%s() DONE (nents %d)\n", __FUNCTION__, nents);
1026 #ifdef ASSERT_PDIR_SANITY
1027 spin_lock_irqsave(&ioc->res_lock, flags);
1028 sba_check_pdir(ioc,"Check after sba_unmap_sg()");
1029 spin_unlock_irqrestore(&ioc->res_lock, flags);
1034 static struct hppa_dma_ops sba_ops = {
1035 .dma_supported = sba_dma_supported,
1036 .alloc_consistent = sba_alloc_consistent,
1037 .alloc_noncoherent = sba_alloc_consistent,
1038 .free_consistent = sba_free_consistent,
1039 .map_single = sba_map_single,
1040 .unmap_single = sba_unmap_single,
1041 .map_sg = sba_map_sg,
1042 .unmap_sg = sba_unmap_sg,
1043 .dma_sync_single_for_cpu = NULL,
1044 .dma_sync_single_for_device = NULL,
1045 .dma_sync_sg_for_cpu = NULL,
1046 .dma_sync_sg_for_device = NULL,
1050 /**************************************************************************
1052 ** SBA PAT PDC support
1054 ** o call pdc_pat_cell_module()
1055 ** o store ranges in PCI "resource" structures
1057 **************************************************************************/
1060 sba_get_pat_resources(struct sba_device *sba_dev)
1064 ** TODO/REVISIT/FIXME: support for directed ranges requires calls to
1065 ** PAT PDC to program the SBA/LBA directed range registers...this
1066 ** burden may fall on the LBA code since it directly supports the
1067 ** PCI subsystem. It's not clear yet. - ggg
1069 PAT_MOD(mod)->mod_info.mod_pages = PAT_GET_MOD_PAGES(temp);
1071 PAT_MOD(mod)->mod_info.dvi = PAT_GET_DVI(temp);
1072 Tells where the dvi bits are located in the address.
1073 PAT_MOD(mod)->mod_info.ioc = PAT_GET_IOC(temp);
1079 /**************************************************************
1081 * Initialization and claim
1083 ***************************************************************/
1084 #define PIRANHA_ADDR_MASK 0x00160000UL /* bit 17,18,20 */
1085 #define PIRANHA_ADDR_VAL 0x00060000UL /* bit 17,18 on */
1087 sba_alloc_pdir(unsigned int pdir_size)
1089 unsigned long pdir_base;
1090 unsigned long pdir_order = get_order(pdir_size);
1092 pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);
1093 if (NULL == (void *) pdir_base) {
1094 panic("%s() could not allocate I/O Page Table\n",
1098 /* If this is not PA8700 (PCX-W2)
1099 ** OR newer than ver 2.2
1100 ** OR in a system that doesn't need VINDEX bits from SBA,
1102 ** then we aren't exposed to the HW bug.
1104 if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13
1105 || (boot_cpu_data.pdc.versions > 0x202)
1106 || (boot_cpu_data.pdc.capabilities & 0x08L) )
1107 return (void *) pdir_base;
1110 * PA8700 (PCX-W2, aka piranha) silent data corruption fix
1112 * An interaction between PA8700 CPU (Ver 2.2 or older) and
1113 * Ike/Astro can cause silent data corruption. This is only
1114 * a problem if the I/O PDIR is located in memory such that
1115 * (little-endian) bits 17 and 18 are on and bit 20 is off.
1117 * Since the max IO Pdir size is 2MB, by cleverly allocating the
1118 * right physical address, we can either avoid (IOPDIR <= 1MB)
1119 * or minimize (2MB IO Pdir) the problem if we restrict the
1120 * IO Pdir to a maximum size of 2MB-128K (1902K).
1122 * Because we always allocate 2^N sized IO pdirs, either of the
1123 * "bad" regions will be the last 128K if at all. That's easy
1127 if (pdir_order <= (19-12)) {
1128 if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) {
1129 /* allocate a new one on 512k alignment */
1130 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12));
1131 /* release original */
1132 free_pages(pdir_base, pdir_order);
1134 pdir_base = new_pdir;
1136 /* release excess */
1137 while (pdir_order < (19-12)) {
1138 new_pdir += pdir_size;
1139 free_pages(new_pdir, pdir_order);
1147 ** Needs to be aligned on an "odd" 1MB boundary.
1149 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */
1151 /* release original */
1152 free_pages( pdir_base, pdir_order);
1154 /* release first 1MB */
1155 free_pages(new_pdir, 20-12);
1157 pdir_base = new_pdir + 1024*1024;
1159 if (pdir_order > (20-12)) {
1163 ** Flag tells init_bitmap() to mark bad 128k as used
1164 ** and to reduce the size by 128k.
1166 piranha_bad_128k = 1;
1168 new_pdir += 3*1024*1024;
1169 /* release last 1MB */
1170 free_pages(new_pdir, 20-12);
1172 /* release unusable 128KB */
1173 free_pages(new_pdir - 128*1024 , 17-12);
1175 pdir_size -= 128*1024;
1179 memset((void *) pdir_base, 0, pdir_size);
1180 return (void *) pdir_base;
1183 static struct device *next_device(struct klist_iter *i)
1185 struct klist_node * n = klist_next(i);
1186 return n ? container_of(n, struct device, knode_parent) : NULL;
1189 /* setup Mercury or Elroy IBASE/IMASK registers. */
1191 setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1193 /* lba_set_iregs() is in drivers/parisc/lba_pci.c */
1194 extern void lba_set_iregs(struct parisc_device *, u32, u32);
1196 struct klist_iter i;
1198 klist_iter_init(&sba->dev.klist_children, &i);
1199 while ((dev = next_device(&i))) {
1200 struct parisc_device *lba = to_parisc_device(dev);
1201 int rope_num = (lba->hpa.start >> 13) & 0xf;
1202 if (rope_num >> 3 == ioc_num)
1203 lba_set_iregs(lba, ioc->ibase, ioc->imask);
1205 klist_iter_exit(&i);
1209 sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1211 u32 iova_space_mask;
1212 u32 iova_space_size;
1213 int iov_order, tcnfg;
1214 #ifdef SBA_AGP_SUPPORT
1218 ** Firmware programs the base and size of a "safe IOVA space"
1219 ** (one that doesn't overlap memory or LMMIO space) in the
1220 ** IBASE and IMASK registers.
1222 ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE);
1223 iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
1225 if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {
1226 printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n");
1227 iova_space_size /= 2;
1231 ** iov_order is always based on a 1GB IOVA space since we want to
1232 ** turn on the other half for AGP GART.
1234 iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT));
1235 ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);
1237 DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)\n",
1238 __FUNCTION__, ioc->ioc_hpa, iova_space_size >> 20,
1239 iov_order + PAGE_SHIFT);
1241 ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
1242 get_order(ioc->pdir_size));
1243 if (!ioc->pdir_base)
1244 panic("Couldn't allocate I/O Page Table\n");
1246 memset(ioc->pdir_base, 0, ioc->pdir_size);
1248 DBG_INIT("%s() pdir %p size %x\n",
1249 __FUNCTION__, ioc->pdir_base, ioc->pdir_size);
1251 #ifdef SBA_HINT_SUPPORT
1252 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1253 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1255 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1256 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1259 WARN_ON((((unsigned long) ioc->pdir_base) & PAGE_MASK) != (unsigned long) ioc->pdir_base);
1260 WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1262 /* build IMASK for IOC and Elroy */
1263 iova_space_mask = 0xffffffff;
1264 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1265 ioc->imask = iova_space_mask;
1267 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1269 sba_dump_tlb(ioc->ioc_hpa);
1271 setup_ibase_imask(sba, ioc, ioc_num);
1273 WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);
1277 ** Setting the upper bits makes checking for bypass addresses
1278 ** a little faster later on.
1280 ioc->imask |= 0xFFFFFFFF00000000UL;
1283 /* Set I/O PDIR Page size to system page size */
1284 switch (PAGE_SHIFT) {
1285 case 12: tcnfg = 0; break; /* 4K */
1286 case 13: tcnfg = 1; break; /* 8K */
1287 case 14: tcnfg = 2; break; /* 16K */
1288 case 16: tcnfg = 3; break; /* 64K */
1290 panic(__FILE__ "Unsupported system page size %d",
1294 WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
1297 ** Program the IOC's ibase and enable IOVA translation
1298 ** Bit zero == enable bit.
1300 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE);
1303 ** Clear I/O TLB of any possible entries.
1304 ** (Yes. This is a bit paranoid...but so what)
1306 WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);
1308 #ifdef SBA_AGP_SUPPORT
1310 struct klist_iter i;
1311 struct device *dev = NULL;
1314 ** If an AGP device is present, only use half of the IOV space
1315 ** for PCI DMA. Unfortunately we can't know ahead of time
1316 ** whether GART support will actually be used, for now we
1317 ** can just key on any AGP device found in the system.
1318 ** We program the next pdir index after we stop w/ a key for
1319 ** the GART code to handshake on.
1321 klist_iter_init(&sba->dev.klist_children, &i);
1322 while ((dev = next_device(&i))) {
1323 struct parisc_device *lba = to_parisc_device(dev);
1324 if (IS_QUICKSILVER(lba))
1327 klist_iter_exit(&i);
1329 if (agp_found && sba_reserve_agpgart) {
1330 printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart\n",
1331 __FUNCTION__, (iova_space_size/2) >> 20);
1332 ioc->pdir_size /= 2;
1333 ioc->pdir_base[PDIR_INDEX(iova_space_size/2)] = SBA_AGPGART_COOKIE;
1336 #endif /*SBA_AGP_SUPPORT*/
1341 sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1343 u32 iova_space_size, iova_space_mask;
1344 unsigned int pdir_size, iov_order;
1347 ** Determine IOVA Space size from memory size.
1349 ** Ideally, PCI drivers would register the maximum number
1350 ** of DMA they can have outstanding for each device they
1351 ** own. Next best thing would be to guess how much DMA
1352 ** can be outstanding based on PCI Class/sub-class. Both
1353 ** methods still require some "extra" to support PCI
1354 ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
1356 ** While we have 32-bits "IOVA" space, top two 2 bits are used
1357 ** for DMA hints - ergo only 30 bits max.
1360 iova_space_size = (u32) (num_physpages/global_ioc_cnt);
1362 /* limit IOVA space size to 1MB-1GB */
1363 if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
1364 iova_space_size = 1 << (20 - PAGE_SHIFT);
1366 else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
1367 iova_space_size = 1 << (30 - PAGE_SHIFT);
1371 ** iova space must be log2() in size.
1372 ** thus, pdir/res_map will also be log2().
1373 ** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced)
1375 iov_order = get_order(iova_space_size << PAGE_SHIFT);
1377 /* iova_space_size is now bytes, not pages */
1378 iova_space_size = 1 << (iov_order + PAGE_SHIFT);
1380 ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64);
1382 DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n",
1385 (unsigned long) num_physpages >> (20 - PAGE_SHIFT),
1386 iova_space_size>>20,
1387 iov_order + PAGE_SHIFT);
1389 ioc->pdir_base = sba_alloc_pdir(pdir_size);
1391 DBG_INIT("%s() pdir %p size %x\n",
1392 __FUNCTION__, ioc->pdir_base, pdir_size);
1394 #ifdef SBA_HINT_SUPPORT
1395 /* FIXME : DMA HINTs not used */
1396 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1397 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1399 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1400 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1403 WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1405 /* build IMASK for IOC and Elroy */
1406 iova_space_mask = 0xffffffff;
1407 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1410 ** On C3000 w/512MB mem, HP-UX 10.20 reports:
1411 ** ibase=0, imask=0xFE000000, size=0x2000000.
1414 ioc->imask = iova_space_mask; /* save it */
1416 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1419 DBG_INIT("%s() IOV base 0x%lx mask 0x%0lx\n",
1420 __FUNCTION__, ioc->ibase, ioc->imask);
1423 ** FIXME: Hint registers are programmed with default hint
1424 ** values during boot, so hints should be sane even if we
1425 ** can't reprogram them the way drivers want.
1428 setup_ibase_imask(sba, ioc, ioc_num);
1431 ** Program the IOC's ibase and enable IOVA translation
1433 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE);
1434 WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
1436 /* Set I/O PDIR Page size to 4K */
1437 WRITE_REG(0, ioc->ioc_hpa+IOC_TCNFG);
1440 ** Clear I/O TLB of any possible entries.
1441 ** (Yes. This is a bit paranoid...but so what)
1443 WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM);
1445 ioc->ibase = 0; /* used by SBA_IOVA and related macros */
1447 DBG_INIT("%s() DONE\n", __FUNCTION__);
1452 /**************************************************************************
1454 ** SBA initialization code (HW and SW)
1456 ** o identify SBA chip itself
1457 ** o initialize SBA chip modes (HardFail)
1458 ** o initialize SBA chip modes (HardFail)
1459 ** o FIXME: initialize DMA hints for reasonable defaults
1461 **************************************************************************/
1463 static void __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset)
1465 return ioremap_nocache(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE);
1468 static void sba_hw_init(struct sba_device *sba_dev)
1474 if (!is_pdc_pat()) {
1475 /* Shutdown the USB controller on Astro-based workstations.
1476 ** Once we reprogram the IOMMU, the next DMA performed by
1477 ** USB will HPMC the box. USB is only enabled if a
1478 ** keyboard is present and found.
1480 ** With serial console, j6k v5.0 firmware says:
1481 ** mem_kbd hpa 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7
1483 ** FIXME: Using GFX+USB console at power up but direct
1484 ** linux to serial console is still broken.
1485 ** USB could generate DMA so we must reset USB.
1486 ** The proper sequence would be:
1487 ** o block console output
1488 ** o reset USB device
1489 ** o reprogram serial port
1490 ** o unblock console output
1492 if (PAGE0->mem_kbd.cl_class == CL_KEYBD) {
1493 pdc_io_reset_devices();
1500 printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa,
1501 PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class);
1504 ** Need to deal with DMA from LAN.
1505 ** Maybe use page zero boot device as a handle to talk
1506 ** to PDC about which device to shutdown.
1508 ** Netbooting, j6k v5.0 firmware says:
1509 ** mem_boot hpa 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002
1510 ** ARGH! invalid class.
1512 if ((PAGE0->mem_boot.cl_class != CL_RANDOM)
1513 && (PAGE0->mem_boot.cl_class != CL_SEQU)) {
1518 if (!IS_PLUTO(sba_dev->dev)) {
1519 ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
1520 DBG_INIT("%s() hpa 0x%lx ioc_ctl 0x%Lx ->",
1521 __FUNCTION__, sba_dev->sba_hpa, ioc_ctl);
1522 ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
1523 ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC;
1524 /* j6700 v1.6 firmware sets 0x294f */
1525 /* A500 firmware sets 0x4d */
1527 WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL);
1529 #ifdef DEBUG_SBA_INIT
1530 ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL);
1531 DBG_INIT(" 0x%Lx\n", ioc_ctl);
1535 if (IS_ASTRO(sba_dev->dev)) {
1537 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET);
1540 sba_dev->chip_resv.name = "Astro Intr Ack";
1541 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfef00000UL;
1542 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff000000UL - 1) ;
1543 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1546 } else if (IS_PLUTO(sba_dev->dev)) {
1549 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET);
1552 sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA";
1553 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfee00000UL;
1554 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff200000UL - 1);
1555 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1558 sba_dev->iommu_resv.name = "IOVA Space";
1559 sba_dev->iommu_resv.start = 0x40000000UL;
1560 sba_dev->iommu_resv.end = 0x50000000UL - 1;
1561 err = request_resource(&iomem_resource, &(sba_dev->iommu_resv));
1565 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0));
1566 sba_dev->ioc[1].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1));
1569 /* TODO - LOOKUP Ike/Stretch chipset mem map */
1571 /* XXX: What about Reo Grande? */
1573 sba_dev->num_ioc = num_ioc;
1574 for (i = 0; i < num_ioc; i++) {
1575 void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa;
1578 for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
1581 * Clear ROPE(N)_CONFIG AO bit.
1582 * Disables "NT Ordering" (~= !"Relaxed Ordering")
1583 * Overrides bit 1 in DMA Hint Sets.
1584 * Improves netperf UDP_STREAM by ~10% for bcm5701.
1586 if (IS_PLUTO(sba_dev->dev)) {
1587 void __iomem *rope_cfg;
1588 unsigned long cfg_val;
1590 rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
1591 cfg_val = READ_REG(rope_cfg);
1592 cfg_val &= ~IOC_ROPE_AO;
1593 WRITE_REG(cfg_val, rope_cfg);
1597 ** Make sure the box crashes on rope errors.
1599 WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
1602 /* flush out the last writes */
1603 READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
1605 DBG_INIT(" ioc[%d] ROPE_CFG 0x%Lx ROPE_DBG 0x%Lx\n",
1607 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40),
1608 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50)
1610 DBG_INIT(" STATUS_CONTROL 0x%Lx FLUSH_CTRL 0x%Lx\n",
1611 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108),
1612 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400)
1615 if (IS_PLUTO(sba_dev->dev)) {
1616 sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i);
1618 sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i);
1624 sba_common_init(struct sba_device *sba_dev)
1628 /* add this one to the head of the list (order doesn't matter)
1629 ** This will be useful for debugging - especially if we get coredumps
1631 sba_dev->next = sba_list;
1634 for(i=0; i< sba_dev->num_ioc; i++) {
1636 #ifdef DEBUG_DMB_TRAP
1637 extern void iterate_pages(unsigned long , unsigned long ,
1638 void (*)(pte_t * , unsigned long),
1640 void set_data_memory_break(pte_t * , unsigned long);
1642 /* resource map size dictated by pdir_size */
1643 res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */
1645 /* Second part of PIRANHA BUG */
1646 if (piranha_bad_128k) {
1647 res_size -= (128*1024)/sizeof(u64);
1650 res_size >>= 3; /* convert bit count to byte count */
1651 DBG_INIT("%s() res_size 0x%x\n",
1652 __FUNCTION__, res_size);
1654 sba_dev->ioc[i].res_size = res_size;
1655 sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size));
1657 #ifdef DEBUG_DMB_TRAP
1658 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1659 set_data_memory_break, 0);
1662 if (NULL == sba_dev->ioc[i].res_map)
1664 panic("%s:%s() could not allocate resource map\n",
1665 __FILE__, __FUNCTION__ );
1668 memset(sba_dev->ioc[i].res_map, 0, res_size);
1669 /* next available IOVP - circular search */
1670 sba_dev->ioc[i].res_hint = (unsigned long *)
1671 &(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]);
1673 #ifdef ASSERT_PDIR_SANITY
1674 /* Mark first bit busy - ie no IOVA 0 */
1675 sba_dev->ioc[i].res_map[0] = 0x80;
1676 sba_dev->ioc[i].pdir_base[0] = 0xeeffc0addbba0080ULL;
1679 /* Third (and last) part of PIRANHA BUG */
1680 if (piranha_bad_128k) {
1681 /* region from +1408K to +1536 is un-usable. */
1683 int idx_start = (1408*1024/sizeof(u64)) >> 3;
1684 int idx_end = (1536*1024/sizeof(u64)) >> 3;
1685 long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]);
1686 long *p_end = (long *) &(sba_dev->ioc[i].res_map[idx_end]);
1688 /* mark that part of the io pdir busy */
1689 while (p_start < p_end)
1694 #ifdef DEBUG_DMB_TRAP
1695 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1696 set_data_memory_break, 0);
1697 iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size,
1698 set_data_memory_break, 0);
1701 DBG_INIT("%s() %d res_map %x %p\n",
1702 __FUNCTION__, i, res_size, sba_dev->ioc[i].res_map);
1705 spin_lock_init(&sba_dev->sba_lock);
1706 ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC;
1708 #ifdef DEBUG_SBA_INIT
1710 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
1711 * (bit #61, big endian), we have to flush and sync every time
1712 * IO-PDIR is changed in Ike/Astro.
1714 if (ioc_needs_fdc) {
1715 printk(KERN_INFO MODULE_NAME " FDC/SYNC required.\n");
1717 printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.\n");
1722 #ifdef CONFIG_PROC_FS
1723 static int sba_proc_info(struct seq_file *m, void *p)
1725 struct sba_device *sba_dev = sba_list;
1726 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1727 int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */
1728 #ifdef SBA_COLLECT_STATS
1729 unsigned long avg = 0, min, max;
1733 len += seq_printf(m, "%s rev %d.%d\n",
1735 (sba_dev->hw_rev & 0x7) + 1,
1736 (sba_dev->hw_rev & 0x18) >> 3
1738 len += seq_printf(m, "IO PDIR size : %d bytes (%d entries)\n",
1739 (int) ((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
1742 len += seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
1743 ioc->res_size, ioc->res_size << 3); /* 8 bits per byte */
1745 len += seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n",
1746 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
1747 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
1748 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE)
1752 len += seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n", i,
1753 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE + i*0x18),
1754 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK + i*0x18),
1755 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18)
1758 #ifdef SBA_COLLECT_STATS
1759 len += seq_printf(m, "IO PDIR entries : %ld free %ld used (%d%%)\n",
1760 total_pages - ioc->used_pages, ioc->used_pages,
1761 (int) (ioc->used_pages * 100 / total_pages));
1763 min = max = ioc->avg_search[0];
1764 for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
1765 avg += ioc->avg_search[i];
1766 if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
1767 if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
1769 avg /= SBA_SEARCH_SAMPLE;
1770 len += seq_printf(m, " Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
1773 len += seq_printf(m, "pci_map_single(): %12ld calls %12ld pages (avg %d/1000)\n",
1774 ioc->msingle_calls, ioc->msingle_pages,
1775 (int) ((ioc->msingle_pages * 1000)/ioc->msingle_calls));
1777 /* KLUGE - unmap_sg calls unmap_single for each mapped page */
1778 min = ioc->usingle_calls;
1779 max = ioc->usingle_pages - ioc->usg_pages;
1780 len += seq_printf(m, "pci_unmap_single: %12ld calls %12ld pages (avg %d/1000)\n",
1781 min, max, (int) ((max * 1000)/min));
1783 len += seq_printf(m, "pci_map_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1784 ioc->msg_calls, ioc->msg_pages,
1785 (int) ((ioc->msg_pages * 1000)/ioc->msg_calls));
1787 len += seq_printf(m, "pci_unmap_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1788 ioc->usg_calls, ioc->usg_pages,
1789 (int) ((ioc->usg_pages * 1000)/ioc->usg_calls));
1796 sba_proc_open(struct inode *i, struct file *f)
1798 return single_open(f, &sba_proc_info, NULL);
1801 static const struct file_operations sba_proc_fops = {
1802 .owner = THIS_MODULE,
1803 .open = sba_proc_open,
1805 .llseek = seq_lseek,
1806 .release = single_release,
1810 sba_proc_bitmap_info(struct seq_file *m, void *p)
1812 struct sba_device *sba_dev = sba_list;
1813 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1814 unsigned int *res_ptr = (unsigned int *)ioc->res_map;
1817 for (i = 0; i < (ioc->res_size/sizeof(unsigned int)); ++i, ++res_ptr) {
1819 len += seq_printf(m, "\n ");
1820 len += seq_printf(m, " %08x", *res_ptr);
1822 len += seq_printf(m, "\n");
1828 sba_proc_bitmap_open(struct inode *i, struct file *f)
1830 return single_open(f, &sba_proc_bitmap_info, NULL);
1833 static const struct file_operations sba_proc_bitmap_fops = {
1834 .owner = THIS_MODULE,
1835 .open = sba_proc_bitmap_open,
1837 .llseek = seq_lseek,
1838 .release = single_release,
1840 #endif /* CONFIG_PROC_FS */
1842 static struct parisc_device_id sba_tbl[] = {
1843 { HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb },
1844 { HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc },
1845 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc },
1846 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc },
1847 { HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc },
1851 int sba_driver_callback(struct parisc_device *);
1853 static struct parisc_driver sba_driver = {
1854 .name = MODULE_NAME,
1855 .id_table = sba_tbl,
1856 .probe = sba_driver_callback,
1860 ** Determine if sba should claim this chip (return 0) or not (return 1).
1861 ** If so, initialize the chip and tell other partners in crime they
1865 sba_driver_callback(struct parisc_device *dev)
1867 struct sba_device *sba_dev;
1871 void __iomem *sba_addr = ioremap_nocache(dev->hpa.start, SBA_FUNC_SIZE);
1872 struct proc_dir_entry *info_entry, *bitmap_entry, *root;
1874 sba_dump_ranges(sba_addr);
1876 /* Read HW Rev First */
1877 func_class = READ_REG(sba_addr + SBA_FCLASS);
1879 if (IS_ASTRO(dev)) {
1880 unsigned long fclass;
1881 static char astro_rev[]="Astro ?.?";
1883 /* Astro is broken...Read HW Rev First */
1884 fclass = READ_REG(sba_addr);
1886 astro_rev[6] = '1' + (char) (fclass & 0x7);
1887 astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3);
1888 version = astro_rev;
1890 } else if (IS_IKE(dev)) {
1891 static char ike_rev[] = "Ike rev ?";
1892 ike_rev[8] = '0' + (char) (func_class & 0xff);
1894 } else if (IS_PLUTO(dev)) {
1895 static char pluto_rev[]="Pluto ?.?";
1896 pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4);
1897 pluto_rev[8] = '0' + (char) (func_class & 0x0f);
1898 version = pluto_rev;
1900 static char reo_rev[] = "REO rev ?";
1901 reo_rev[8] = '0' + (char) (func_class & 0xff);
1905 if (!global_ioc_cnt) {
1906 global_ioc_cnt = count_parisc_driver(&sba_driver);
1908 /* Astro and Pluto have one IOC per SBA */
1909 if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev)))
1910 global_ioc_cnt *= 2;
1913 printk(KERN_INFO "%s found %s at 0x%llx\n",
1914 MODULE_NAME, version, (unsigned long long)dev->hpa.start);
1916 sba_dev = kzalloc(sizeof(struct sba_device), GFP_KERNEL);
1918 printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device\n");
1922 parisc_set_drvdata(dev, sba_dev);
1924 for(i=0; i<MAX_IOC; i++)
1925 spin_lock_init(&(sba_dev->ioc[i].res_lock));
1928 sba_dev->hw_rev = func_class;
1929 sba_dev->name = dev->name;
1930 sba_dev->sba_hpa = sba_addr;
1932 sba_get_pat_resources(sba_dev);
1933 sba_hw_init(sba_dev);
1934 sba_common_init(sba_dev);
1936 hppa_dma_ops = &sba_ops;
1938 #ifdef CONFIG_PROC_FS
1939 switch (dev->id.hversion) {
1940 case PLUTO_MCKINLEY_PORT:
1941 root = proc_mckinley_root;
1943 case ASTRO_RUNWAY_PORT:
1944 case IKE_MERCED_PORT:
1946 root = proc_runway_root;
1950 info_entry = create_proc_entry("sba_iommu", 0, root);
1951 bitmap_entry = create_proc_entry("sba_iommu-bitmap", 0, root);
1954 info_entry->proc_fops = &sba_proc_fops;
1957 bitmap_entry->proc_fops = &sba_proc_bitmap_fops;
1960 parisc_vmerge_boundary = IOVP_SIZE;
1961 parisc_vmerge_max_size = IOVP_SIZE * BITS_PER_LONG;
1967 ** One time initialization to let the world know the SBA was found.
1968 ** This is the only routine which is NOT static.
1969 ** Must be called exactly once before pci_init().
1971 void __init sba_init(void)
1973 register_parisc_driver(&sba_driver);
1978 * sba_get_iommu - Assign the iommu pointer for the pci bus controller.
1979 * @dev: The parisc device.
1981 * Returns the appropriate IOMMU data for the given parisc PCI controller.
1982 * This is cached and used later for PCI DMA Mapping.
1984 void * sba_get_iommu(struct parisc_device *pci_hba)
1986 struct parisc_device *sba_dev = parisc_parent(pci_hba);
1987 struct sba_device *sba = sba_dev->dev.driver_data;
1988 char t = sba_dev->id.hw_type;
1989 int iocnum = (pci_hba->hw_path >> 3); /* rope # */
1991 WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT));
1993 return &(sba->ioc[iocnum]);
1998 * sba_directed_lmmio - return first directed LMMIO range routed to rope
1999 * @pa_dev: The parisc device.
2000 * @r: resource PCI host controller wants start/end fields assigned.
2002 * For the given parisc PCI controller, determine if any direct ranges
2003 * are routed down the corresponding rope.
2005 void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
2007 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2008 struct sba_device *sba = sba_dev->dev.driver_data;
2009 char t = sba_dev->id.hw_type;
2011 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2013 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2015 r->start = r->end = 0;
2017 /* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
2018 for (i=0; i<4; i++) {
2020 void __iomem *reg = sba->sba_hpa + i*0x18;
2022 base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
2023 if ((base & 1) == 0)
2024 continue; /* not enabled */
2026 size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);
2028 if ((size & (ROPES_PER_IOC-1)) != rope)
2029 continue; /* directed down different rope */
2031 r->start = (base & ~1UL) | PCI_F_EXTEND;
2032 size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
2033 r->end = r->start + size;
2039 * sba_distributed_lmmio - return portion of distributed LMMIO range
2040 * @pa_dev: The parisc device.
2041 * @r: resource PCI host controller wants start/end fields assigned.
2043 * For the given parisc PCI controller, return portion of distributed LMMIO
2044 * range. The distributed LMMIO is always present and it's just a question
2045 * of the base address and size of the range.
2047 void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
2049 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2050 struct sba_device *sba = sba_dev->dev.driver_data;
2051 char t = sba_dev->id.hw_type;
2053 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2055 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2057 r->start = r->end = 0;
2059 base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
2060 if ((base & 1) == 0) {
2061 BUG(); /* Gah! Distr Range wasn't enabled! */
2065 r->start = (base & ~1UL) | PCI_F_EXTEND;
2067 size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
2068 r->start += rope * (size + 1); /* adjust base for this rope */
2069 r->end = r->start + size;