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>
32 #include <asm/byteorder.h>
34 #include <asm/dma.h> /* for DMA_CHUNK_SIZE */
36 #include <asm/hardware.h> /* for register_parisc_driver() stuff */
38 #include <linux/proc_fs.h>
39 #include <linux/seq_file.h>
41 #include <asm/ropes.h>
42 #include <asm/mckinley.h> /* for proc_mckinley_root */
43 #include <asm/runway.h> /* for proc_runway_root */
44 #include <asm/pdc.h> /* for PDC_MODEL_* */
45 #include <asm/pdcpat.h> /* for is_pdc_pat() */
46 #include <asm/parisc-device.h>
48 #define MODULE_NAME "SBA"
51 ** The number of debug flags is a clue - this code is fragile.
52 ** Don't even think about messing with it unless you have
53 ** plenty of 710's to sacrifice to the computer gods. :^)
57 #undef DEBUG_SBA_RUN_SG
58 #undef DEBUG_SBA_RESOURCE
59 #undef ASSERT_PDIR_SANITY
60 #undef DEBUG_LARGE_SG_ENTRIES
64 #define DBG_INIT(x...) printk(x)
66 #define DBG_INIT(x...)
70 #define DBG_RUN(x...) printk(x)
75 #ifdef DEBUG_SBA_RUN_SG
76 #define DBG_RUN_SG(x...) printk(x)
78 #define DBG_RUN_SG(x...)
82 #ifdef DEBUG_SBA_RESOURCE
83 #define DBG_RES(x...) printk(x)
88 #define SBA_INLINE __inline__
90 #define DEFAULT_DMA_HINT_REG 0
92 static struct sba_device *sba_list;
94 static unsigned long ioc_needs_fdc = 0;
96 /* global count of IOMMUs in the system */
97 static unsigned int global_ioc_cnt = 0;
99 /* PA8700 (Piranha 2.2) bug workaround */
100 static unsigned long piranha_bad_128k = 0;
102 /* Looks nice and keeps the compiler happy */
103 #define SBA_DEV(d) ((struct sba_device *) (d))
105 #ifdef SBA_AGP_SUPPORT
106 static int reserve_sba_gart = 1;
109 #define ROUNDUP(x,y) ((x + ((y)-1)) & ~((y)-1))
112 /************************************
113 ** SBA register read and write support
115 ** BE WARNED: register writes are posted.
116 ** (ie follow writes which must reach HW with a read)
118 ** Superdome (in particular, REO) allows only 64-bit CSR accesses.
120 #define READ_REG32(addr) readl(addr)
121 #define READ_REG64(addr) readq(addr)
122 #define WRITE_REG32(val, addr) writel((val), (addr))
123 #define WRITE_REG64(val, addr) writeq((val), (addr))
126 #define READ_REG(addr) READ_REG64(addr)
127 #define WRITE_REG(value, addr) WRITE_REG64(value, addr)
129 #define READ_REG(addr) READ_REG32(addr)
130 #define WRITE_REG(value, addr) WRITE_REG32(value, addr)
133 #ifdef DEBUG_SBA_INIT
135 /* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */
138 * sba_dump_ranges - debugging only - print ranges assigned to this IOA
139 * @hpa: base address of the sba
141 * Print the MMIO and IO Port address ranges forwarded by an Astro/Ike/RIO
142 * IO Adapter (aka Bus Converter).
145 sba_dump_ranges(void __iomem *hpa)
147 DBG_INIT("SBA at 0x%p\n", hpa);
148 DBG_INIT("IOS_DIST_BASE : %Lx\n", READ_REG64(hpa+IOS_DIST_BASE));
149 DBG_INIT("IOS_DIST_MASK : %Lx\n", READ_REG64(hpa+IOS_DIST_MASK));
150 DBG_INIT("IOS_DIST_ROUTE : %Lx\n", READ_REG64(hpa+IOS_DIST_ROUTE));
152 DBG_INIT("IOS_DIRECT_BASE : %Lx\n", READ_REG64(hpa+IOS_DIRECT_BASE));
153 DBG_INIT("IOS_DIRECT_MASK : %Lx\n", READ_REG64(hpa+IOS_DIRECT_MASK));
154 DBG_INIT("IOS_DIRECT_ROUTE: %Lx\n", READ_REG64(hpa+IOS_DIRECT_ROUTE));
158 * sba_dump_tlb - debugging only - print IOMMU operating parameters
159 * @hpa: base address of the IOMMU
161 * Print the size/location of the IO MMU PDIR.
163 static void sba_dump_tlb(void __iomem *hpa)
165 DBG_INIT("IO TLB at 0x%p\n", hpa);
166 DBG_INIT("IOC_IBASE : 0x%Lx\n", READ_REG64(hpa+IOC_IBASE));
167 DBG_INIT("IOC_IMASK : 0x%Lx\n", READ_REG64(hpa+IOC_IMASK));
168 DBG_INIT("IOC_TCNFG : 0x%Lx\n", READ_REG64(hpa+IOC_TCNFG));
169 DBG_INIT("IOC_PDIR_BASE: 0x%Lx\n", READ_REG64(hpa+IOC_PDIR_BASE));
173 #define sba_dump_ranges(x)
174 #define sba_dump_tlb(x)
175 #endif /* DEBUG_SBA_INIT */
178 #ifdef ASSERT_PDIR_SANITY
181 * sba_dump_pdir_entry - debugging only - print one IOMMU PDIR entry
182 * @ioc: IO MMU structure which owns the pdir we are interested in.
183 * @msg: text to print ont the output line.
186 * Print one entry of the IO MMU PDIR in human readable form.
189 sba_dump_pdir_entry(struct ioc *ioc, char *msg, uint pide)
191 /* start printing from lowest pde in rval */
192 u64 *ptr = &(ioc->pdir_base[pide & (~0U * BITS_PER_LONG)]);
193 unsigned long *rptr = (unsigned long *) &(ioc->res_map[(pide >>3) & ~(sizeof(unsigned long) - 1)]);
196 printk(KERN_DEBUG "SBA: %s rp %p bit %d rval 0x%lx\n",
198 rptr, pide & (BITS_PER_LONG - 1), *rptr);
201 while (rcnt < BITS_PER_LONG) {
202 printk(KERN_DEBUG "%s %2d %p %016Lx\n",
203 (rcnt == (pide & (BITS_PER_LONG - 1)))
209 printk(KERN_DEBUG "%s", msg);
214 * sba_check_pdir - debugging only - consistency checker
215 * @ioc: IO MMU structure which owns the pdir we are interested in.
216 * @msg: text to print ont the output line.
218 * Verify the resource map and pdir state is consistent
221 sba_check_pdir(struct ioc *ioc, char *msg)
223 u32 *rptr_end = (u32 *) &(ioc->res_map[ioc->res_size]);
224 u32 *rptr = (u32 *) ioc->res_map; /* resource map ptr */
225 u64 *pptr = ioc->pdir_base; /* pdir ptr */
228 while (rptr < rptr_end) {
230 int rcnt = 32; /* number of bits we might check */
233 /* Get last byte and highest bit from that */
234 u32 pde = ((u32) (((char *)pptr)[7])) << 24;
235 if ((rval ^ pde) & 0x80000000)
238 ** BUMMER! -- res_map != pdir --
239 ** Dump rval and matching pdir entries
241 sba_dump_pdir_entry(ioc, msg, pide);
245 rval <<= 1; /* try the next bit */
249 rptr++; /* look at next word of res_map */
251 /* It'd be nice if we always got here :^) */
257 * sba_dump_sg - debugging only - print Scatter-Gather list
258 * @ioc: IO MMU structure which owns the pdir we are interested in.
259 * @startsg: head of the SG list
260 * @nents: number of entries in SG list
262 * print the SG list so we can verify it's correct by hand.
265 sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
267 while (nents-- > 0) {
268 printk(KERN_DEBUG " %d : %08lx/%05x %p/%05x\n",
270 (unsigned long) sg_dma_address(startsg),
272 sg_virt_addr(startsg), startsg->length);
277 #endif /* ASSERT_PDIR_SANITY */
282 /**************************************************************
284 * I/O Pdir Resource Management
286 * Bits set in the resource map are in use.
287 * Each bit can represent a number of pages.
288 * LSbs represent lower addresses (IOVA's).
290 ***************************************************************/
291 #define PAGES_PER_RANGE 1 /* could increase this to 4 or 8 if needed */
293 /* Convert from IOVP to IOVA and vice versa. */
296 /* Pluto (aka ZX1) boxes need to set or clear the ibase bits appropriately */
297 #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((ioc->ibase) | (iovp) | (offset))
298 #define SBA_IOVP(ioc,iova) ((iova) & (ioc)->iovp_mask)
300 /* only support Astro and ancestors. Saves a few cycles in key places */
301 #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset))
302 #define SBA_IOVP(ioc,iova) (iova)
305 #define PDIR_INDEX(iovp) ((iovp)>>IOVP_SHIFT)
307 #define RESMAP_MASK(n) (~0UL << (BITS_PER_LONG - (n)))
308 #define RESMAP_IDX_MASK (sizeof(unsigned long) - 1)
312 * sba_search_bitmap - find free space in IO PDIR resource bitmap
313 * @ioc: IO MMU structure which owns the pdir we are interested in.
314 * @bits_wanted: number of entries we need.
316 * Find consecutive free bits in resource bitmap.
317 * Each bit represents one entry in the IO Pdir.
318 * Cool perf optimization: search for log2(size) bits at a time.
320 static SBA_INLINE unsigned long
321 sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted)
323 unsigned long *res_ptr = ioc->res_hint;
324 unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
325 unsigned long pide = ~0UL;
327 if (bits_wanted > (BITS_PER_LONG/2)) {
328 /* Search word at a time - no mask needed */
329 for(; res_ptr < res_end; ++res_ptr) {
331 *res_ptr = RESMAP_MASK(bits_wanted);
332 pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map);
333 pide <<= 3; /* convert to bit address */
337 /* point to the next word on next pass */
339 ioc->res_bitshift = 0;
342 ** Search the resource bit map on well-aligned values.
343 ** "o" is the alignment.
344 ** We need the alignment to invalidate I/O TLB using
345 ** SBA HW features in the unmap path.
347 unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT);
348 uint bitshiftcnt = ROUNDUP(ioc->res_bitshift, o);
351 if (bitshiftcnt >= BITS_PER_LONG) {
355 mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;
357 DBG_RES("%s() o %ld %p", __FUNCTION__, o, res_ptr);
358 while(res_ptr < res_end)
360 DBG_RES(" %p %lx %lx\n", res_ptr, mask, *res_ptr);
362 if(((*res_ptr) & mask) == 0) {
363 *res_ptr |= mask; /* mark resources busy! */
364 pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map);
365 pide <<= 3; /* convert to bit address */
372 mask = RESMAP_MASK(bits_wanted);
377 /* look in the same word on the next pass */
378 ioc->res_bitshift = bitshiftcnt + bits_wanted;
382 if (res_end <= res_ptr) {
383 ioc->res_hint = (unsigned long *) ioc->res_map;
384 ioc->res_bitshift = 0;
386 ioc->res_hint = res_ptr;
393 * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
394 * @ioc: IO MMU structure which owns the pdir we are interested in.
395 * @size: number of bytes to create a mapping for
397 * Given a size, find consecutive unmarked and then mark those bits in the
401 sba_alloc_range(struct ioc *ioc, size_t size)
403 unsigned int pages_needed = size >> IOVP_SHIFT;
404 #ifdef SBA_COLLECT_STATS
405 unsigned long cr_start = mfctl(16);
409 pide = sba_search_bitmap(ioc, pages_needed);
410 if (pide >= (ioc->res_size << 3)) {
411 pide = sba_search_bitmap(ioc, pages_needed);
412 if (pide >= (ioc->res_size << 3))
413 panic("%s: I/O MMU @ %p is out of mapping resources\n",
414 __FILE__, ioc->ioc_hpa);
417 #ifdef ASSERT_PDIR_SANITY
418 /* verify the first enable bit is clear */
419 if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) {
420 sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
424 DBG_RES("%s(%x) %d -> %lx hint %x/%x\n",
425 __FUNCTION__, size, pages_needed, pide,
426 (uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
429 #ifdef SBA_COLLECT_STATS
431 unsigned long cr_end = mfctl(16);
432 unsigned long tmp = cr_end - cr_start;
433 /* check for roll over */
434 cr_start = (cr_end < cr_start) ? -(tmp) : (tmp);
436 ioc->avg_search[ioc->avg_idx++] = cr_start;
437 ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
439 ioc->used_pages += pages_needed;
447 * sba_free_range - unmark bits in IO PDIR resource bitmap
448 * @ioc: IO MMU structure which owns the pdir we are interested in.
449 * @iova: IO virtual address which was previously allocated.
450 * @size: number of bytes to create a mapping for
452 * clear bits in the ioc's resource map
454 static SBA_INLINE void
455 sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
457 unsigned long iovp = SBA_IOVP(ioc, iova);
458 unsigned int pide = PDIR_INDEX(iovp);
459 unsigned int ridx = pide >> 3; /* convert bit to byte address */
460 unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
462 int bits_not_wanted = size >> IOVP_SHIFT;
464 /* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
465 unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
467 DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n",
468 __FUNCTION__, (uint) iova, size,
469 bits_not_wanted, m, pide, res_ptr, *res_ptr);
471 #ifdef SBA_COLLECT_STATS
472 ioc->used_pages -= bits_not_wanted;
479 /**************************************************************
481 * "Dynamic DMA Mapping" support (aka "Coherent I/O")
483 ***************************************************************/
485 #ifdef SBA_HINT_SUPPORT
486 #define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
489 typedef unsigned long space_t;
490 #define KERNEL_SPACE 0
493 * sba_io_pdir_entry - fill in one IO PDIR entry
494 * @pdir_ptr: pointer to IO PDIR entry
495 * @sid: process Space ID - currently only support KERNEL_SPACE
496 * @vba: Virtual CPU address of buffer to map
497 * @hint: DMA hint set to use for this mapping
499 * SBA Mapping Routine
501 * Given a virtual address (vba, arg2) and space id, (sid, arg1)
502 * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
504 * Using the bass-ackwards HP bit numbering, Each IO Pdir entry
505 * for Astro/Ike looks like:
509 * +-+---------------------+----------------------------------+----+--------+
510 * |V| U | PPN[43:12] | U | VI |
511 * +-+---------------------+----------------------------------+----+--------+
513 * Pluto is basically identical, supports fewer physical address bits:
516 * +-+------------------------+-------------------------------+----+--------+
517 * |V| U | PPN[39:12] | U | VI |
518 * +-+------------------------+-------------------------------+----+--------+
520 * V == Valid Bit (Most Significant Bit is bit 0)
522 * PPN == Physical Page Number
523 * VI == Virtual Index (aka Coherent Index)
525 * LPA instruction output is put into PPN field.
526 * LCI (Load Coherence Index) instruction provides the "VI" bits.
528 * We pre-swap the bytes since PCX-W is Big Endian and the
529 * IOMMU uses little endian for the pdir.
533 sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
536 u64 pa; /* physical address */
537 register unsigned ci; /* coherent index */
539 pa = virt_to_phys(vba);
543 asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
544 pa |= (ci >> 12) & 0xff; /* move CI (8 bits) into lowest byte */
546 pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */
547 *pdir_ptr = cpu_to_le64(pa); /* swap and store into I/O Pdir */
550 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
551 * (bit #61, big endian), we have to flush and sync every time
552 * IO-PDIR is changed in Ike/Astro.
555 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
560 * sba_mark_invalid - invalidate one or more IO PDIR entries
561 * @ioc: IO MMU structure which owns the pdir we are interested in.
562 * @iova: IO Virtual Address mapped earlier
563 * @byte_cnt: number of bytes this mapping covers.
565 * Marking the IO PDIR entry(ies) as Invalid and invalidate
566 * corresponding IO TLB entry. The Ike PCOM (Purge Command Register)
567 * is to purge stale entries in the IO TLB when unmapping entries.
569 * The PCOM register supports purging of multiple pages, with a minium
570 * of 1 page and a maximum of 2GB. Hardware requires the address be
571 * aligned to the size of the range being purged. The size of the range
572 * must be a power of 2. The "Cool perf optimization" in the
573 * allocation routine helps keep that true.
575 static SBA_INLINE void
576 sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
578 u32 iovp = (u32) SBA_IOVP(ioc,iova);
579 u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
581 #ifdef ASSERT_PDIR_SANITY
582 /* Assert first pdir entry is set.
584 ** Even though this is a big-endian machine, the entries
585 ** in the iopdir are little endian. That's why we look at
586 ** the byte at +7 instead of at +0.
588 if (0x80 != (((u8 *) pdir_ptr)[7])) {
589 sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
593 if (byte_cnt > IOVP_SIZE)
596 unsigned long entries_per_cacheline = ioc_needs_fdc ?
597 L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
598 - (unsigned long) pdir_ptr;
602 /* set "size" field for PCOM */
603 iovp |= get_order(byte_cnt) + PAGE_SHIFT;
606 /* clear I/O Pdir entry "valid" bit first */
607 ((u8 *) pdir_ptr)[7] = 0;
609 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
611 entries_per_cacheline = L1_CACHE_SHIFT - 3;
615 byte_cnt -= IOVP_SIZE;
616 } while (byte_cnt > IOVP_SIZE);
618 iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
621 ** clear I/O PDIR entry "valid" bit.
622 ** We have to R/M/W the cacheline regardless how much of the
623 ** pdir entry that we clobber.
624 ** The rest of the entry would be useful for debugging if we
625 ** could dump core on HPMC.
627 ((u8 *) pdir_ptr)[7] = 0;
629 asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
631 WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
635 * sba_dma_supported - PCI driver can query DMA support
636 * @dev: instance of PCI owned by the driver that's asking
637 * @mask: number of address bits this PCI device can handle
639 * See Documentation/DMA-mapping.txt
641 static int sba_dma_supported( struct device *dev, u64 mask)
646 printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
651 /* Documentation/DMA-mapping.txt tells drivers to try 64-bit first,
652 * then fall back to 32-bit if that fails.
653 * We are just "encouraging" 32-bit DMA masks here since we can
654 * never allow IOMMU bypass unless we add special support for ZX1.
662 * check if mask is >= than the current max IO Virt Address
663 * The max IO Virt address will *always* < 30 bits.
665 return((int)(mask >= (ioc->ibase - 1 +
666 (ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
671 * sba_map_single - map one buffer and return IOVA for DMA
672 * @dev: instance of PCI owned by the driver that's asking.
673 * @addr: driver buffer to map.
674 * @size: number of bytes to map in driver buffer.
675 * @direction: R/W or both.
677 * See Documentation/DMA-mapping.txt
680 sba_map_single(struct device *dev, void *addr, size_t size,
681 enum dma_data_direction direction)
692 /* save offset bits */
693 offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
695 /* round up to nearest IOVP_SIZE */
696 size = (size + offset + ~IOVP_MASK) & IOVP_MASK;
698 spin_lock_irqsave(&ioc->res_lock, flags);
699 #ifdef ASSERT_PDIR_SANITY
700 sba_check_pdir(ioc,"Check before sba_map_single()");
703 #ifdef SBA_COLLECT_STATS
704 ioc->msingle_calls++;
705 ioc->msingle_pages += size >> IOVP_SHIFT;
707 pide = sba_alloc_range(ioc, size);
708 iovp = (dma_addr_t) pide << IOVP_SHIFT;
710 DBG_RUN("%s() 0x%p -> 0x%lx\n",
711 __FUNCTION__, addr, (long) iovp | offset);
713 pdir_start = &(ioc->pdir_base[pide]);
716 sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr, 0);
718 DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x\n",
720 (u8) (((u8 *) pdir_start)[7]),
721 (u8) (((u8 *) pdir_start)[6]),
722 (u8) (((u8 *) pdir_start)[5]),
723 (u8) (((u8 *) pdir_start)[4]),
724 (u8) (((u8 *) pdir_start)[3]),
725 (u8) (((u8 *) pdir_start)[2]),
726 (u8) (((u8 *) pdir_start)[1]),
727 (u8) (((u8 *) pdir_start)[0])
735 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
737 asm volatile("sync" : : );
739 #ifdef ASSERT_PDIR_SANITY
740 sba_check_pdir(ioc,"Check after sba_map_single()");
742 spin_unlock_irqrestore(&ioc->res_lock, flags);
744 /* form complete address */
745 return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
750 * sba_unmap_single - unmap one IOVA and free resources
751 * @dev: instance of PCI owned by the driver that's asking.
752 * @iova: IOVA of driver buffer previously mapped.
753 * @size: number of bytes mapped in driver buffer.
754 * @direction: R/W or both.
756 * See Documentation/DMA-mapping.txt
759 sba_unmap_single(struct device *dev, dma_addr_t iova, size_t size,
760 enum dma_data_direction direction)
763 #if DELAYED_RESOURCE_CNT > 0
764 struct sba_dma_pair *d;
769 DBG_RUN("%s() iovp 0x%lx/%x\n", __FUNCTION__, (long) iova, size);
772 offset = iova & ~IOVP_MASK;
773 iova ^= offset; /* clear offset bits */
775 size = ROUNDUP(size, IOVP_SIZE);
777 spin_lock_irqsave(&ioc->res_lock, flags);
779 #ifdef SBA_COLLECT_STATS
780 ioc->usingle_calls++;
781 ioc->usingle_pages += size >> IOVP_SHIFT;
784 sba_mark_invalid(ioc, iova, size);
786 #if DELAYED_RESOURCE_CNT > 0
787 /* Delaying when we re-use a IO Pdir entry reduces the number
788 * of MMIO reads needed to flush writes to the PCOM register.
790 d = &(ioc->saved[ioc->saved_cnt]);
793 if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
794 int cnt = ioc->saved_cnt;
796 sba_free_range(ioc, d->iova, d->size);
801 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
803 #else /* DELAYED_RESOURCE_CNT == 0 */
804 sba_free_range(ioc, iova, size);
806 /* If fdc's were issued, force fdc's to be visible now */
808 asm volatile("sync" : : );
810 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
811 #endif /* DELAYED_RESOURCE_CNT == 0 */
813 spin_unlock_irqrestore(&ioc->res_lock, flags);
815 /* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
816 ** For Astro based systems this isn't a big deal WRT performance.
817 ** As long as 2.4 kernels copyin/copyout data from/to userspace,
818 ** we don't need the syncdma. The issue here is I/O MMU cachelines
819 ** are *not* coherent in all cases. May be hwrev dependent.
820 ** Need to investigate more.
821 asm volatile("syncdma");
827 * sba_alloc_consistent - allocate/map shared mem for DMA
828 * @hwdev: instance of PCI owned by the driver that's asking.
829 * @size: number of bytes mapped in driver buffer.
830 * @dma_handle: IOVA of new buffer.
832 * See Documentation/DMA-mapping.txt
834 static void *sba_alloc_consistent(struct device *hwdev, size_t size,
835 dma_addr_t *dma_handle, gfp_t gfp)
840 /* only support PCI */
845 ret = (void *) __get_free_pages(gfp, get_order(size));
848 memset(ret, 0, size);
849 *dma_handle = sba_map_single(hwdev, ret, size, 0);
857 * sba_free_consistent - free/unmap shared mem for DMA
858 * @hwdev: instance of PCI owned by the driver that's asking.
859 * @size: number of bytes mapped in driver buffer.
860 * @vaddr: virtual address IOVA of "consistent" buffer.
861 * @dma_handler: IO virtual address of "consistent" buffer.
863 * See Documentation/DMA-mapping.txt
866 sba_free_consistent(struct device *hwdev, size_t size, void *vaddr,
867 dma_addr_t dma_handle)
869 sba_unmap_single(hwdev, dma_handle, size, 0);
870 free_pages((unsigned long) vaddr, get_order(size));
875 ** Since 0 is a valid pdir_base index value, can't use that
876 ** to determine if a value is valid or not. Use a flag to indicate
877 ** the SG list entry contains a valid pdir index.
879 #define PIDE_FLAG 0x80000000UL
881 #ifdef SBA_COLLECT_STATS
882 #define IOMMU_MAP_STATS
884 #include "iommu-helpers.h"
886 #ifdef DEBUG_LARGE_SG_ENTRIES
892 * sba_map_sg - map Scatter/Gather list
893 * @dev: instance of PCI owned by the driver that's asking.
894 * @sglist: array of buffer/length pairs
895 * @nents: number of entries in list
896 * @direction: R/W or both.
898 * See Documentation/DMA-mapping.txt
901 sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
902 enum dma_data_direction direction)
905 int coalesced, filled = 0;
908 DBG_RUN_SG("%s() START %d entries\n", __FUNCTION__, nents);
912 /* Fast path single entry scatterlists. */
914 sg_dma_address(sglist) = sba_map_single(dev,
915 (void *)sg_virt_addr(sglist),
916 sglist->length, direction);
917 sg_dma_len(sglist) = sglist->length;
921 spin_lock_irqsave(&ioc->res_lock, flags);
923 #ifdef ASSERT_PDIR_SANITY
924 if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
926 sba_dump_sg(ioc, sglist, nents);
927 panic("Check before sba_map_sg()");
931 #ifdef SBA_COLLECT_STATS
936 ** First coalesce the chunks and allocate I/O pdir space
938 ** If this is one DMA stream, we can properly map using the
939 ** correct virtual address associated with each DMA page.
940 ** w/o this association, we wouldn't have coherent DMA!
941 ** Access to the virtual address is what forces a two pass algorithm.
943 coalesced = iommu_coalesce_chunks(ioc, sglist, nents, sba_alloc_range);
946 ** Program the I/O Pdir
948 ** map the virtual addresses to the I/O Pdir
949 ** o dma_address will contain the pdir index
950 ** o dma_len will contain the number of bytes to map
951 ** o address contains the virtual address.
953 filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry);
955 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
957 asm volatile("sync" : : );
959 #ifdef ASSERT_PDIR_SANITY
960 if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
962 sba_dump_sg(ioc, sglist, nents);
963 panic("Check after sba_map_sg()\n");
967 spin_unlock_irqrestore(&ioc->res_lock, flags);
969 DBG_RUN_SG("%s() DONE %d mappings\n", __FUNCTION__, filled);
976 * sba_unmap_sg - unmap Scatter/Gather list
977 * @dev: instance of PCI owned by the driver that's asking.
978 * @sglist: array of buffer/length pairs
979 * @nents: number of entries in list
980 * @direction: R/W or both.
982 * See Documentation/DMA-mapping.txt
985 sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
986 enum dma_data_direction direction)
989 #ifdef ASSERT_PDIR_SANITY
993 DBG_RUN_SG("%s() START %d entries, %p,%x\n",
994 __FUNCTION__, nents, sg_virt_addr(sglist), sglist->length);
998 #ifdef SBA_COLLECT_STATS
1002 #ifdef ASSERT_PDIR_SANITY
1003 spin_lock_irqsave(&ioc->res_lock, flags);
1004 sba_check_pdir(ioc,"Check before sba_unmap_sg()");
1005 spin_unlock_irqrestore(&ioc->res_lock, flags);
1008 while (sg_dma_len(sglist) && nents--) {
1010 sba_unmap_single(dev, sg_dma_address(sglist), sg_dma_len(sglist), direction);
1011 #ifdef SBA_COLLECT_STATS
1012 ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT;
1013 ioc->usingle_calls--; /* kluge since call is unmap_sg() */
1018 DBG_RUN_SG("%s() DONE (nents %d)\n", __FUNCTION__, nents);
1020 #ifdef ASSERT_PDIR_SANITY
1021 spin_lock_irqsave(&ioc->res_lock, flags);
1022 sba_check_pdir(ioc,"Check after sba_unmap_sg()");
1023 spin_unlock_irqrestore(&ioc->res_lock, flags);
1028 static struct hppa_dma_ops sba_ops = {
1029 .dma_supported = sba_dma_supported,
1030 .alloc_consistent = sba_alloc_consistent,
1031 .alloc_noncoherent = sba_alloc_consistent,
1032 .free_consistent = sba_free_consistent,
1033 .map_single = sba_map_single,
1034 .unmap_single = sba_unmap_single,
1035 .map_sg = sba_map_sg,
1036 .unmap_sg = sba_unmap_sg,
1037 .dma_sync_single_for_cpu = NULL,
1038 .dma_sync_single_for_device = NULL,
1039 .dma_sync_sg_for_cpu = NULL,
1040 .dma_sync_sg_for_device = NULL,
1044 /**************************************************************************
1046 ** SBA PAT PDC support
1048 ** o call pdc_pat_cell_module()
1049 ** o store ranges in PCI "resource" structures
1051 **************************************************************************/
1054 sba_get_pat_resources(struct sba_device *sba_dev)
1058 ** TODO/REVISIT/FIXME: support for directed ranges requires calls to
1059 ** PAT PDC to program the SBA/LBA directed range registers...this
1060 ** burden may fall on the LBA code since it directly supports the
1061 ** PCI subsystem. It's not clear yet. - ggg
1063 PAT_MOD(mod)->mod_info.mod_pages = PAT_GET_MOD_PAGES(temp);
1065 PAT_MOD(mod)->mod_info.dvi = PAT_GET_DVI(temp);
1066 Tells where the dvi bits are located in the address.
1067 PAT_MOD(mod)->mod_info.ioc = PAT_GET_IOC(temp);
1073 /**************************************************************
1075 * Initialization and claim
1077 ***************************************************************/
1078 #define PIRANHA_ADDR_MASK 0x00160000UL /* bit 17,18,20 */
1079 #define PIRANHA_ADDR_VAL 0x00060000UL /* bit 17,18 on */
1081 sba_alloc_pdir(unsigned int pdir_size)
1083 unsigned long pdir_base;
1084 unsigned long pdir_order = get_order(pdir_size);
1086 pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);
1087 if (NULL == (void *) pdir_base) {
1088 panic("%s() could not allocate I/O Page Table\n",
1092 /* If this is not PA8700 (PCX-W2)
1093 ** OR newer than ver 2.2
1094 ** OR in a system that doesn't need VINDEX bits from SBA,
1096 ** then we aren't exposed to the HW bug.
1098 if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13
1099 || (boot_cpu_data.pdc.versions > 0x202)
1100 || (boot_cpu_data.pdc.capabilities & 0x08L) )
1101 return (void *) pdir_base;
1104 * PA8700 (PCX-W2, aka piranha) silent data corruption fix
1106 * An interaction between PA8700 CPU (Ver 2.2 or older) and
1107 * Ike/Astro can cause silent data corruption. This is only
1108 * a problem if the I/O PDIR is located in memory such that
1109 * (little-endian) bits 17 and 18 are on and bit 20 is off.
1111 * Since the max IO Pdir size is 2MB, by cleverly allocating the
1112 * right physical address, we can either avoid (IOPDIR <= 1MB)
1113 * or minimize (2MB IO Pdir) the problem if we restrict the
1114 * IO Pdir to a maximum size of 2MB-128K (1902K).
1116 * Because we always allocate 2^N sized IO pdirs, either of the
1117 * "bad" regions will be the last 128K if at all. That's easy
1121 if (pdir_order <= (19-12)) {
1122 if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) {
1123 /* allocate a new one on 512k alignment */
1124 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12));
1125 /* release original */
1126 free_pages(pdir_base, pdir_order);
1128 pdir_base = new_pdir;
1130 /* release excess */
1131 while (pdir_order < (19-12)) {
1132 new_pdir += pdir_size;
1133 free_pages(new_pdir, pdir_order);
1141 ** Needs to be aligned on an "odd" 1MB boundary.
1143 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */
1145 /* release original */
1146 free_pages( pdir_base, pdir_order);
1148 /* release first 1MB */
1149 free_pages(new_pdir, 20-12);
1151 pdir_base = new_pdir + 1024*1024;
1153 if (pdir_order > (20-12)) {
1157 ** Flag tells init_bitmap() to mark bad 128k as used
1158 ** and to reduce the size by 128k.
1160 piranha_bad_128k = 1;
1162 new_pdir += 3*1024*1024;
1163 /* release last 1MB */
1164 free_pages(new_pdir, 20-12);
1166 /* release unusable 128KB */
1167 free_pages(new_pdir - 128*1024 , 17-12);
1169 pdir_size -= 128*1024;
1173 memset((void *) pdir_base, 0, pdir_size);
1174 return (void *) pdir_base;
1177 static struct device *next_device(struct klist_iter *i)
1179 struct klist_node * n = klist_next(i);
1180 return n ? container_of(n, struct device, knode_parent) : NULL;
1183 /* setup Mercury or Elroy IBASE/IMASK registers. */
1185 setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1187 /* lba_set_iregs() is in drivers/parisc/lba_pci.c */
1188 extern void lba_set_iregs(struct parisc_device *, u32, u32);
1190 struct klist_iter i;
1192 klist_iter_init(&sba->dev.klist_children, &i);
1193 while ((dev = next_device(&i))) {
1194 struct parisc_device *lba = to_parisc_device(dev);
1195 int rope_num = (lba->hpa.start >> 13) & 0xf;
1196 if (rope_num >> 3 == ioc_num)
1197 lba_set_iregs(lba, ioc->ibase, ioc->imask);
1199 klist_iter_exit(&i);
1203 sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1205 u32 iova_space_mask;
1206 u32 iova_space_size;
1207 int iov_order, tcnfg;
1208 #ifdef SBA_AGP_SUPPORT
1212 ** Firmware programs the base and size of a "safe IOVA space"
1213 ** (one that doesn't overlap memory or LMMIO space) in the
1214 ** IBASE and IMASK registers.
1216 ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE);
1217 iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
1219 if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {
1220 printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n");
1221 iova_space_size /= 2;
1225 ** iov_order is always based on a 1GB IOVA space since we want to
1226 ** turn on the other half for AGP GART.
1228 iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT));
1229 ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);
1231 DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)\n",
1232 __FUNCTION__, ioc->ioc_hpa, iova_space_size >> 20,
1233 iov_order + PAGE_SHIFT);
1235 ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
1236 get_order(ioc->pdir_size));
1237 if (!ioc->pdir_base)
1238 panic("Couldn't allocate I/O Page Table\n");
1240 memset(ioc->pdir_base, 0, ioc->pdir_size);
1242 DBG_INIT("%s() pdir %p size %x\n",
1243 __FUNCTION__, ioc->pdir_base, ioc->pdir_size);
1245 #ifdef SBA_HINT_SUPPORT
1246 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1247 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1249 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1250 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1253 WARN_ON((((unsigned long) ioc->pdir_base) & PAGE_MASK) != (unsigned long) ioc->pdir_base);
1254 WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1256 /* build IMASK for IOC and Elroy */
1257 iova_space_mask = 0xffffffff;
1258 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1259 ioc->imask = iova_space_mask;
1261 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1263 sba_dump_tlb(ioc->ioc_hpa);
1265 setup_ibase_imask(sba, ioc, ioc_num);
1267 WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);
1271 ** Setting the upper bits makes checking for bypass addresses
1272 ** a little faster later on.
1274 ioc->imask |= 0xFFFFFFFF00000000UL;
1277 /* Set I/O PDIR Page size to system page size */
1278 switch (PAGE_SHIFT) {
1279 case 12: tcnfg = 0; break; /* 4K */
1280 case 13: tcnfg = 1; break; /* 8K */
1281 case 14: tcnfg = 2; break; /* 16K */
1282 case 16: tcnfg = 3; break; /* 64K */
1284 panic(__FILE__ "Unsupported system page size %d",
1288 WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
1291 ** Program the IOC's ibase and enable IOVA translation
1292 ** Bit zero == enable bit.
1294 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE);
1297 ** Clear I/O TLB of any possible entries.
1298 ** (Yes. This is a bit paranoid...but so what)
1300 WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);
1302 #ifdef SBA_AGP_SUPPORT
1304 ** If an AGP device is present, only use half of the IOV space
1305 ** for PCI DMA. Unfortunately we can't know ahead of time
1306 ** whether GART support will actually be used, for now we
1307 ** can just key on any AGP device found in the system.
1308 ** We program the next pdir index after we stop w/ a key for
1309 ** the GART code to handshake on.
1312 for (lba = sba->child; lba; lba = lba->sibling) {
1313 if (IS_QUICKSILVER(lba))
1318 DBG_INIT("%s: Reserving half of IOVA space for AGP GART support\n", __FUNCTION__);
1319 ioc->pdir_size /= 2;
1320 ((u64 *)ioc->pdir_base)[PDIR_INDEX(iova_space_size/2)] = SBA_IOMMU_COOKIE;
1322 DBG_INIT("%s: No GART needed - no AGP controller found\n", __FUNCTION__);
1329 sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1331 u32 iova_space_size, iova_space_mask;
1332 unsigned int pdir_size, iov_order;
1335 ** Determine IOVA Space size from memory size.
1337 ** Ideally, PCI drivers would register the maximum number
1338 ** of DMA they can have outstanding for each device they
1339 ** own. Next best thing would be to guess how much DMA
1340 ** can be outstanding based on PCI Class/sub-class. Both
1341 ** methods still require some "extra" to support PCI
1342 ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
1344 ** While we have 32-bits "IOVA" space, top two 2 bits are used
1345 ** for DMA hints - ergo only 30 bits max.
1348 iova_space_size = (u32) (num_physpages/global_ioc_cnt);
1350 /* limit IOVA space size to 1MB-1GB */
1351 if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
1352 iova_space_size = 1 << (20 - PAGE_SHIFT);
1354 else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
1355 iova_space_size = 1 << (30 - PAGE_SHIFT);
1359 ** iova space must be log2() in size.
1360 ** thus, pdir/res_map will also be log2().
1361 ** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced)
1363 iov_order = get_order(iova_space_size << PAGE_SHIFT);
1365 /* iova_space_size is now bytes, not pages */
1366 iova_space_size = 1 << (iov_order + PAGE_SHIFT);
1368 ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64);
1370 DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n",
1373 (unsigned long) num_physpages >> (20 - PAGE_SHIFT),
1374 iova_space_size>>20,
1375 iov_order + PAGE_SHIFT);
1377 ioc->pdir_base = sba_alloc_pdir(pdir_size);
1379 DBG_INIT("%s() pdir %p size %x\n",
1380 __FUNCTION__, ioc->pdir_base, pdir_size);
1382 #ifdef SBA_HINT_SUPPORT
1383 /* FIXME : DMA HINTs not used */
1384 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1385 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1387 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1388 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1391 WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1393 /* build IMASK for IOC and Elroy */
1394 iova_space_mask = 0xffffffff;
1395 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1398 ** On C3000 w/512MB mem, HP-UX 10.20 reports:
1399 ** ibase=0, imask=0xFE000000, size=0x2000000.
1402 ioc->imask = iova_space_mask; /* save it */
1404 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1407 DBG_INIT("%s() IOV base 0x%lx mask 0x%0lx\n",
1408 __FUNCTION__, ioc->ibase, ioc->imask);
1411 ** FIXME: Hint registers are programmed with default hint
1412 ** values during boot, so hints should be sane even if we
1413 ** can't reprogram them the way drivers want.
1416 setup_ibase_imask(sba, ioc, ioc_num);
1419 ** Program the IOC's ibase and enable IOVA translation
1421 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE);
1422 WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
1424 /* Set I/O PDIR Page size to 4K */
1425 WRITE_REG(0, ioc->ioc_hpa+IOC_TCNFG);
1428 ** Clear I/O TLB of any possible entries.
1429 ** (Yes. This is a bit paranoid...but so what)
1431 WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM);
1433 ioc->ibase = 0; /* used by SBA_IOVA and related macros */
1435 DBG_INIT("%s() DONE\n", __FUNCTION__);
1440 /**************************************************************************
1442 ** SBA initialization code (HW and SW)
1444 ** o identify SBA chip itself
1445 ** o initialize SBA chip modes (HardFail)
1446 ** o initialize SBA chip modes (HardFail)
1447 ** o FIXME: initialize DMA hints for reasonable defaults
1449 **************************************************************************/
1451 static void __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset)
1453 return ioremap_nocache(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE);
1456 static void sba_hw_init(struct sba_device *sba_dev)
1462 if (!is_pdc_pat()) {
1463 /* Shutdown the USB controller on Astro-based workstations.
1464 ** Once we reprogram the IOMMU, the next DMA performed by
1465 ** USB will HPMC the box. USB is only enabled if a
1466 ** keyboard is present and found.
1468 ** With serial console, j6k v5.0 firmware says:
1469 ** mem_kbd hpa 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7
1471 ** FIXME: Using GFX+USB console at power up but direct
1472 ** linux to serial console is still broken.
1473 ** USB could generate DMA so we must reset USB.
1474 ** The proper sequence would be:
1475 ** o block console output
1476 ** o reset USB device
1477 ** o reprogram serial port
1478 ** o unblock console output
1480 if (PAGE0->mem_kbd.cl_class == CL_KEYBD) {
1481 pdc_io_reset_devices();
1488 printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa,
1489 PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class);
1492 ** Need to deal with DMA from LAN.
1493 ** Maybe use page zero boot device as a handle to talk
1494 ** to PDC about which device to shutdown.
1496 ** Netbooting, j6k v5.0 firmware says:
1497 ** mem_boot hpa 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002
1498 ** ARGH! invalid class.
1500 if ((PAGE0->mem_boot.cl_class != CL_RANDOM)
1501 && (PAGE0->mem_boot.cl_class != CL_SEQU)) {
1506 if (!IS_PLUTO(sba_dev->dev)) {
1507 ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
1508 DBG_INIT("%s() hpa 0x%lx ioc_ctl 0x%Lx ->",
1509 __FUNCTION__, sba_dev->sba_hpa, ioc_ctl);
1510 ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
1511 ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC;
1512 /* j6700 v1.6 firmware sets 0x294f */
1513 /* A500 firmware sets 0x4d */
1515 WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL);
1517 #ifdef DEBUG_SBA_INIT
1518 ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL);
1519 DBG_INIT(" 0x%Lx\n", ioc_ctl);
1523 if (IS_ASTRO(sba_dev->dev)) {
1525 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET);
1528 sba_dev->chip_resv.name = "Astro Intr Ack";
1529 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfef00000UL;
1530 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff000000UL - 1) ;
1531 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1534 } else if (IS_PLUTO(sba_dev->dev)) {
1537 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET);
1540 sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA";
1541 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfee00000UL;
1542 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff200000UL - 1);
1543 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1546 sba_dev->iommu_resv.name = "IOVA Space";
1547 sba_dev->iommu_resv.start = 0x40000000UL;
1548 sba_dev->iommu_resv.end = 0x50000000UL - 1;
1549 err = request_resource(&iomem_resource, &(sba_dev->iommu_resv));
1553 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0));
1554 sba_dev->ioc[1].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1));
1557 /* TODO - LOOKUP Ike/Stretch chipset mem map */
1559 /* XXX: What about Reo Grande? */
1561 sba_dev->num_ioc = num_ioc;
1562 for (i = 0; i < num_ioc; i++) {
1563 void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa;
1566 for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
1569 * Clear ROPE(N)_CONFIG AO bit.
1570 * Disables "NT Ordering" (~= !"Relaxed Ordering")
1571 * Overrides bit 1 in DMA Hint Sets.
1572 * Improves netperf UDP_STREAM by ~10% for bcm5701.
1574 if (IS_PLUTO(sba_dev->dev)) {
1575 void __iomem *rope_cfg;
1576 unsigned long cfg_val;
1578 rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
1579 cfg_val = READ_REG(rope_cfg);
1580 cfg_val &= ~IOC_ROPE_AO;
1581 WRITE_REG(cfg_val, rope_cfg);
1585 ** Make sure the box crashes on rope errors.
1587 WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
1590 /* flush out the last writes */
1591 READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
1593 DBG_INIT(" ioc[%d] ROPE_CFG 0x%Lx ROPE_DBG 0x%Lx\n",
1595 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40),
1596 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50)
1598 DBG_INIT(" STATUS_CONTROL 0x%Lx FLUSH_CTRL 0x%Lx\n",
1599 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108),
1600 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400)
1603 if (IS_PLUTO(sba_dev->dev)) {
1604 sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i);
1606 sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i);
1612 sba_common_init(struct sba_device *sba_dev)
1616 /* add this one to the head of the list (order doesn't matter)
1617 ** This will be useful for debugging - especially if we get coredumps
1619 sba_dev->next = sba_list;
1622 for(i=0; i< sba_dev->num_ioc; i++) {
1624 #ifdef DEBUG_DMB_TRAP
1625 extern void iterate_pages(unsigned long , unsigned long ,
1626 void (*)(pte_t * , unsigned long),
1628 void set_data_memory_break(pte_t * , unsigned long);
1630 /* resource map size dictated by pdir_size */
1631 res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */
1633 /* Second part of PIRANHA BUG */
1634 if (piranha_bad_128k) {
1635 res_size -= (128*1024)/sizeof(u64);
1638 res_size >>= 3; /* convert bit count to byte count */
1639 DBG_INIT("%s() res_size 0x%x\n",
1640 __FUNCTION__, res_size);
1642 sba_dev->ioc[i].res_size = res_size;
1643 sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size));
1645 #ifdef DEBUG_DMB_TRAP
1646 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1647 set_data_memory_break, 0);
1650 if (NULL == sba_dev->ioc[i].res_map)
1652 panic("%s:%s() could not allocate resource map\n",
1653 __FILE__, __FUNCTION__ );
1656 memset(sba_dev->ioc[i].res_map, 0, res_size);
1657 /* next available IOVP - circular search */
1658 sba_dev->ioc[i].res_hint = (unsigned long *)
1659 &(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]);
1661 #ifdef ASSERT_PDIR_SANITY
1662 /* Mark first bit busy - ie no IOVA 0 */
1663 sba_dev->ioc[i].res_map[0] = 0x80;
1664 sba_dev->ioc[i].pdir_base[0] = 0xeeffc0addbba0080ULL;
1667 /* Third (and last) part of PIRANHA BUG */
1668 if (piranha_bad_128k) {
1669 /* region from +1408K to +1536 is un-usable. */
1671 int idx_start = (1408*1024/sizeof(u64)) >> 3;
1672 int idx_end = (1536*1024/sizeof(u64)) >> 3;
1673 long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]);
1674 long *p_end = (long *) &(sba_dev->ioc[i].res_map[idx_end]);
1676 /* mark that part of the io pdir busy */
1677 while (p_start < p_end)
1682 #ifdef DEBUG_DMB_TRAP
1683 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1684 set_data_memory_break, 0);
1685 iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size,
1686 set_data_memory_break, 0);
1689 DBG_INIT("%s() %d res_map %x %p\n",
1690 __FUNCTION__, i, res_size, sba_dev->ioc[i].res_map);
1693 spin_lock_init(&sba_dev->sba_lock);
1694 ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC;
1696 #ifdef DEBUG_SBA_INIT
1698 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
1699 * (bit #61, big endian), we have to flush and sync every time
1700 * IO-PDIR is changed in Ike/Astro.
1702 if (ioc_needs_fdc) {
1703 printk(KERN_INFO MODULE_NAME " FDC/SYNC required.\n");
1705 printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.\n");
1710 #ifdef CONFIG_PROC_FS
1711 static int sba_proc_info(struct seq_file *m, void *p)
1713 struct sba_device *sba_dev = sba_list;
1714 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1715 int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */
1716 #ifdef SBA_COLLECT_STATS
1717 unsigned long avg = 0, min, max;
1721 len += seq_printf(m, "%s rev %d.%d\n",
1723 (sba_dev->hw_rev & 0x7) + 1,
1724 (sba_dev->hw_rev & 0x18) >> 3
1726 len += seq_printf(m, "IO PDIR size : %d bytes (%d entries)\n",
1727 (int) ((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
1730 len += seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
1731 ioc->res_size, ioc->res_size << 3); /* 8 bits per byte */
1733 len += seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n",
1734 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
1735 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
1736 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE)
1740 len += seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n", i,
1741 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE + i*0x18),
1742 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK + i*0x18),
1743 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18)
1746 #ifdef SBA_COLLECT_STATS
1747 len += seq_printf(m, "IO PDIR entries : %ld free %ld used (%d%%)\n",
1748 total_pages - ioc->used_pages, ioc->used_pages,
1749 (int) (ioc->used_pages * 100 / total_pages));
1751 min = max = ioc->avg_search[0];
1752 for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
1753 avg += ioc->avg_search[i];
1754 if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
1755 if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
1757 avg /= SBA_SEARCH_SAMPLE;
1758 len += seq_printf(m, " Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
1761 len += seq_printf(m, "pci_map_single(): %12ld calls %12ld pages (avg %d/1000)\n",
1762 ioc->msingle_calls, ioc->msingle_pages,
1763 (int) ((ioc->msingle_pages * 1000)/ioc->msingle_calls));
1765 /* KLUGE - unmap_sg calls unmap_single for each mapped page */
1766 min = ioc->usingle_calls;
1767 max = ioc->usingle_pages - ioc->usg_pages;
1768 len += seq_printf(m, "pci_unmap_single: %12ld calls %12ld pages (avg %d/1000)\n",
1769 min, max, (int) ((max * 1000)/min));
1771 len += seq_printf(m, "pci_map_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1772 ioc->msg_calls, ioc->msg_pages,
1773 (int) ((ioc->msg_pages * 1000)/ioc->msg_calls));
1775 len += seq_printf(m, "pci_unmap_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1776 ioc->usg_calls, ioc->usg_pages,
1777 (int) ((ioc->usg_pages * 1000)/ioc->usg_calls));
1784 sba_proc_open(struct inode *i, struct file *f)
1786 return single_open(f, &sba_proc_info, NULL);
1789 static struct file_operations sba_proc_fops = {
1790 .owner = THIS_MODULE,
1791 .open = sba_proc_open,
1793 .llseek = seq_lseek,
1794 .release = single_release,
1798 sba_proc_bitmap_info(struct seq_file *m, void *p)
1800 struct sba_device *sba_dev = sba_list;
1801 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1802 unsigned int *res_ptr = (unsigned int *)ioc->res_map;
1805 for (i = 0; i < (ioc->res_size/sizeof(unsigned int)); ++i, ++res_ptr) {
1807 len += seq_printf(m, "\n ");
1808 len += seq_printf(m, " %08x", *res_ptr);
1810 len += seq_printf(m, "\n");
1816 sba_proc_bitmap_open(struct inode *i, struct file *f)
1818 return single_open(f, &sba_proc_bitmap_info, NULL);
1821 static struct file_operations sba_proc_bitmap_fops = {
1822 .owner = THIS_MODULE,
1823 .open = sba_proc_bitmap_open,
1825 .llseek = seq_lseek,
1826 .release = single_release,
1828 #endif /* CONFIG_PROC_FS */
1830 static struct parisc_device_id sba_tbl[] = {
1831 { HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb },
1832 { HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc },
1833 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc },
1834 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc },
1835 { HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc },
1839 int sba_driver_callback(struct parisc_device *);
1841 static struct parisc_driver sba_driver = {
1842 .name = MODULE_NAME,
1843 .id_table = sba_tbl,
1844 .probe = sba_driver_callback,
1848 ** Determine if sba should claim this chip (return 0) or not (return 1).
1849 ** If so, initialize the chip and tell other partners in crime they
1853 sba_driver_callback(struct parisc_device *dev)
1855 struct sba_device *sba_dev;
1859 void __iomem *sba_addr = ioremap_nocache(dev->hpa.start, SBA_FUNC_SIZE);
1860 struct proc_dir_entry *info_entry, *bitmap_entry, *root;
1862 sba_dump_ranges(sba_addr);
1864 /* Read HW Rev First */
1865 func_class = READ_REG(sba_addr + SBA_FCLASS);
1867 if (IS_ASTRO(dev)) {
1868 unsigned long fclass;
1869 static char astro_rev[]="Astro ?.?";
1871 /* Astro is broken...Read HW Rev First */
1872 fclass = READ_REG(sba_addr);
1874 astro_rev[6] = '1' + (char) (fclass & 0x7);
1875 astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3);
1876 version = astro_rev;
1878 } else if (IS_IKE(dev)) {
1879 static char ike_rev[] = "Ike rev ?";
1880 ike_rev[8] = '0' + (char) (func_class & 0xff);
1882 } else if (IS_PLUTO(dev)) {
1883 static char pluto_rev[]="Pluto ?.?";
1884 pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4);
1885 pluto_rev[8] = '0' + (char) (func_class & 0x0f);
1886 version = pluto_rev;
1888 static char reo_rev[] = "REO rev ?";
1889 reo_rev[8] = '0' + (char) (func_class & 0xff);
1893 if (!global_ioc_cnt) {
1894 global_ioc_cnt = count_parisc_driver(&sba_driver);
1896 /* Astro and Pluto have one IOC per SBA */
1897 if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev)))
1898 global_ioc_cnt *= 2;
1901 printk(KERN_INFO "%s found %s at 0x%lx\n",
1902 MODULE_NAME, version, dev->hpa.start);
1904 sba_dev = kzalloc(sizeof(struct sba_device), GFP_KERNEL);
1906 printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device\n");
1910 parisc_set_drvdata(dev, sba_dev);
1912 for(i=0; i<MAX_IOC; i++)
1913 spin_lock_init(&(sba_dev->ioc[i].res_lock));
1916 sba_dev->hw_rev = func_class;
1917 sba_dev->name = dev->name;
1918 sba_dev->sba_hpa = sba_addr;
1920 sba_get_pat_resources(sba_dev);
1921 sba_hw_init(sba_dev);
1922 sba_common_init(sba_dev);
1924 hppa_dma_ops = &sba_ops;
1926 #ifdef CONFIG_PROC_FS
1927 switch (dev->id.hversion) {
1928 case PLUTO_MCKINLEY_PORT:
1929 root = proc_mckinley_root;
1931 case ASTRO_RUNWAY_PORT:
1932 case IKE_MERCED_PORT:
1934 root = proc_runway_root;
1938 info_entry = create_proc_entry("sba_iommu", 0, root);
1939 bitmap_entry = create_proc_entry("sba_iommu-bitmap", 0, root);
1942 info_entry->proc_fops = &sba_proc_fops;
1945 bitmap_entry->proc_fops = &sba_proc_bitmap_fops;
1948 parisc_vmerge_boundary = IOVP_SIZE;
1949 parisc_vmerge_max_size = IOVP_SIZE * BITS_PER_LONG;
1955 ** One time initialization to let the world know the SBA was found.
1956 ** This is the only routine which is NOT static.
1957 ** Must be called exactly once before pci_init().
1959 void __init sba_init(void)
1961 register_parisc_driver(&sba_driver);
1966 * sba_get_iommu - Assign the iommu pointer for the pci bus controller.
1967 * @dev: The parisc device.
1969 * Returns the appropriate IOMMU data for the given parisc PCI controller.
1970 * This is cached and used later for PCI DMA Mapping.
1972 void * sba_get_iommu(struct parisc_device *pci_hba)
1974 struct parisc_device *sba_dev = parisc_parent(pci_hba);
1975 struct sba_device *sba = sba_dev->dev.driver_data;
1976 char t = sba_dev->id.hw_type;
1977 int iocnum = (pci_hba->hw_path >> 3); /* rope # */
1979 WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT));
1981 return &(sba->ioc[iocnum]);
1986 * sba_directed_lmmio - return first directed LMMIO range routed to rope
1987 * @pa_dev: The parisc device.
1988 * @r: resource PCI host controller wants start/end fields assigned.
1990 * For the given parisc PCI controller, determine if any direct ranges
1991 * are routed down the corresponding rope.
1993 void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
1995 struct parisc_device *sba_dev = parisc_parent(pci_hba);
1996 struct sba_device *sba = sba_dev->dev.driver_data;
1997 char t = sba_dev->id.hw_type;
1999 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2001 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2003 r->start = r->end = 0;
2005 /* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
2006 for (i=0; i<4; i++) {
2008 void __iomem *reg = sba->sba_hpa + i*0x18;
2010 base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
2011 if ((base & 1) == 0)
2012 continue; /* not enabled */
2014 size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);
2016 if ((size & (ROPES_PER_IOC-1)) != rope)
2017 continue; /* directed down different rope */
2019 r->start = (base & ~1UL) | PCI_F_EXTEND;
2020 size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
2021 r->end = r->start + size;
2027 * sba_distributed_lmmio - return portion of distributed LMMIO range
2028 * @pa_dev: The parisc device.
2029 * @r: resource PCI host controller wants start/end fields assigned.
2031 * For the given parisc PCI controller, return portion of distributed LMMIO
2032 * range. The distributed LMMIO is always present and it's just a question
2033 * of the base address and size of the range.
2035 void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
2037 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2038 struct sba_device *sba = sba_dev->dev.driver_data;
2039 char t = sba_dev->id.hw_type;
2041 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2043 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2045 r->start = r->end = 0;
2047 base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
2048 if ((base & 1) == 0) {
2049 BUG(); /* Gah! Distr Range wasn't enabled! */
2053 r->start = (base & ~1UL) | PCI_F_EXTEND;
2055 size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
2056 r->start += rope * (size + 1); /* adjust base for this rope */
2057 r->end = r->start + size;