1 // SPDX-License-Identifier: GPL-2.0-or-later
3 ** System Bus Adapter (SBA) I/O MMU manager
5 ** (c) Copyright 2000-2004 Grant Grundler <grundler @ parisc-linux x org>
6 ** (c) Copyright 2004 Naresh Kumar Inna <knaresh at india x hp x com>
7 ** (c) Copyright 2000-2004 Hewlett-Packard Company
9 ** Portions (c) 1999 Dave S. Miller (from sparc64 I/O MMU code)
13 ** This module initializes the IOC (I/O Controller) found on B1000/C3000/
14 ** J5000/J7000/N-class/L-class machines and their successors.
16 ** FIXME: add DMA hint support programming in both sba and lba modules.
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <linux/spinlock.h>
22 #include <linux/slab.h>
23 #include <linux/init.h>
26 #include <linux/string.h>
27 #include <linux/pci.h>
28 #include <linux/dma-map-ops.h>
29 #include <linux/scatterlist.h>
30 #include <linux/iommu-helper.h>
32 * The semantics of 64 register access on 32bit systems can't be guaranteed
33 * by the C standard, we hope the _lo_hi() macros defining readq and writeq
34 * here will behave as expected.
36 #include <linux/io-64-nonatomic-lo-hi.h>
38 #include <asm/byteorder.h>
40 #include <asm/dma.h> /* for DMA_CHUNK_SIZE */
42 #include <asm/hardware.h> /* for register_parisc_driver() stuff */
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/module.h>
48 #include <asm/ropes.h>
49 #include <asm/mckinley.h> /* for proc_mckinley_root */
50 #include <asm/runway.h> /* for proc_runway_root */
51 #include <asm/page.h> /* for PAGE0 */
52 #include <asm/pdc.h> /* for PDC_MODEL_* */
53 #include <asm/pdcpat.h> /* for is_pdc_pat() */
54 #include <asm/parisc-device.h>
58 #define MODULE_NAME "SBA"
61 ** The number of debug flags is a clue - this code is fragile.
62 ** Don't even think about messing with it unless you have
63 ** plenty of 710's to sacrifice to the computer gods. :^)
67 #undef DEBUG_SBA_RUN_SG
68 #undef DEBUG_SBA_RESOURCE
69 #undef ASSERT_PDIR_SANITY
70 #undef DEBUG_LARGE_SG_ENTRIES
74 #define DBG_INIT(x...) printk(x)
76 #define DBG_INIT(x...)
80 #define DBG_RUN(x...) printk(x)
85 #ifdef DEBUG_SBA_RUN_SG
86 #define DBG_RUN_SG(x...) printk(x)
88 #define DBG_RUN_SG(x...)
92 #ifdef DEBUG_SBA_RESOURCE
93 #define DBG_RES(x...) printk(x)
98 #define SBA_INLINE __inline__
100 #define DEFAULT_DMA_HINT_REG 0
102 struct sba_device *sba_list;
103 EXPORT_SYMBOL_GPL(sba_list);
105 static unsigned long ioc_needs_fdc = 0;
107 /* global count of IOMMUs in the system */
108 static unsigned int global_ioc_cnt = 0;
110 /* PA8700 (Piranha 2.2) bug workaround */
111 static unsigned long piranha_bad_128k = 0;
113 /* Looks nice and keeps the compiler happy */
114 #define SBA_DEV(d) ((struct sba_device *) (d))
116 #ifdef CONFIG_AGP_PARISC
117 #define SBA_AGP_SUPPORT
118 #endif /*CONFIG_AGP_PARISC*/
120 #ifdef SBA_AGP_SUPPORT
121 static int sba_reserve_agpgart = 1;
122 module_param(sba_reserve_agpgart, int, 0444);
123 MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART");
127 /************************************
128 ** SBA register read and write support
130 ** BE WARNED: register writes are posted.
131 ** (ie follow writes which must reach HW with a read)
133 ** Superdome (in particular, REO) allows only 64-bit CSR accesses.
135 #define READ_REG32(addr) readl(addr)
136 #define READ_REG64(addr) readq(addr)
137 #define WRITE_REG32(val, addr) writel((val), (addr))
138 #define WRITE_REG64(val, addr) writeq((val), (addr))
141 #define READ_REG(addr) READ_REG64(addr)
142 #define WRITE_REG(value, addr) WRITE_REG64(value, addr)
144 #define READ_REG(addr) READ_REG32(addr)
145 #define WRITE_REG(value, addr) WRITE_REG32(value, addr)
148 #ifdef DEBUG_SBA_INIT
150 /* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */
153 * sba_dump_ranges - debugging only - print ranges assigned to this IOA
154 * @hpa: base address of the sba
156 * Print the MMIO and IO Port address ranges forwarded by an Astro/Ike/RIO
157 * IO Adapter (aka Bus Converter).
160 sba_dump_ranges(void __iomem *hpa)
162 DBG_INIT("SBA at 0x%p\n", hpa);
163 DBG_INIT("IOS_DIST_BASE : %Lx\n", READ_REG64(hpa+IOS_DIST_BASE));
164 DBG_INIT("IOS_DIST_MASK : %Lx\n", READ_REG64(hpa+IOS_DIST_MASK));
165 DBG_INIT("IOS_DIST_ROUTE : %Lx\n", READ_REG64(hpa+IOS_DIST_ROUTE));
167 DBG_INIT("IOS_DIRECT_BASE : %Lx\n", READ_REG64(hpa+IOS_DIRECT_BASE));
168 DBG_INIT("IOS_DIRECT_MASK : %Lx\n", READ_REG64(hpa+IOS_DIRECT_MASK));
169 DBG_INIT("IOS_DIRECT_ROUTE: %Lx\n", READ_REG64(hpa+IOS_DIRECT_ROUTE));
173 * sba_dump_tlb - debugging only - print IOMMU operating parameters
174 * @hpa: base address of the IOMMU
176 * Print the size/location of the IO MMU PDIR.
178 static void sba_dump_tlb(void __iomem *hpa)
180 DBG_INIT("IO TLB at 0x%p\n", hpa);
181 DBG_INIT("IOC_IBASE : 0x%Lx\n", READ_REG64(hpa+IOC_IBASE));
182 DBG_INIT("IOC_IMASK : 0x%Lx\n", READ_REG64(hpa+IOC_IMASK));
183 DBG_INIT("IOC_TCNFG : 0x%Lx\n", READ_REG64(hpa+IOC_TCNFG));
184 DBG_INIT("IOC_PDIR_BASE: 0x%Lx\n", READ_REG64(hpa+IOC_PDIR_BASE));
188 #define sba_dump_ranges(x)
189 #define sba_dump_tlb(x)
190 #endif /* DEBUG_SBA_INIT */
193 #ifdef ASSERT_PDIR_SANITY
196 * sba_dump_pdir_entry - debugging only - print one IOMMU PDIR entry
197 * @ioc: IO MMU structure which owns the pdir we are interested in.
198 * @msg: text to print ont the output line.
201 * Print one entry of the IO MMU PDIR in human readable form.
204 sba_dump_pdir_entry(struct ioc *ioc, char *msg, uint pide)
206 /* start printing from lowest pde in rval */
207 u64 *ptr = &(ioc->pdir_base[pide & (~0U * BITS_PER_LONG)]);
208 unsigned long *rptr = (unsigned long *) &(ioc->res_map[(pide >>3) & ~(sizeof(unsigned long) - 1)]);
211 printk(KERN_DEBUG "SBA: %s rp %p bit %d rval 0x%lx\n",
213 rptr, pide & (BITS_PER_LONG - 1), *rptr);
216 while (rcnt < BITS_PER_LONG) {
217 printk(KERN_DEBUG "%s %2d %p %016Lx\n",
218 (rcnt == (pide & (BITS_PER_LONG - 1)))
224 printk(KERN_DEBUG "%s", msg);
229 * sba_check_pdir - debugging only - consistency checker
230 * @ioc: IO MMU structure which owns the pdir we are interested in.
231 * @msg: text to print ont the output line.
233 * Verify the resource map and pdir state is consistent
236 sba_check_pdir(struct ioc *ioc, char *msg)
238 u32 *rptr_end = (u32 *) &(ioc->res_map[ioc->res_size]);
239 u32 *rptr = (u32 *) ioc->res_map; /* resource map ptr */
240 u64 *pptr = ioc->pdir_base; /* pdir ptr */
243 while (rptr < rptr_end) {
245 int rcnt = 32; /* number of bits we might check */
248 /* Get last byte and highest bit from that */
249 u32 pde = ((u32) (((char *)pptr)[7])) << 24;
250 if ((rval ^ pde) & 0x80000000)
253 ** BUMMER! -- res_map != pdir --
254 ** Dump rval and matching pdir entries
256 sba_dump_pdir_entry(ioc, msg, pide);
260 rval <<= 1; /* try the next bit */
264 rptr++; /* look at next word of res_map */
266 /* It'd be nice if we always got here :^) */
272 * sba_dump_sg - debugging only - print Scatter-Gather list
273 * @ioc: IO MMU structure which owns the pdir we are interested in.
274 * @startsg: head of the SG list
275 * @nents: number of entries in SG list
277 * print the SG list so we can verify it's correct by hand.
280 sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
282 while (nents-- > 0) {
283 printk(KERN_DEBUG " %d : %08lx/%05x %p/%05x\n",
285 (unsigned long) sg_dma_address(startsg),
287 sg_virt(startsg), startsg->length);
292 #endif /* ASSERT_PDIR_SANITY */
297 /**************************************************************
299 * I/O Pdir Resource Management
301 * Bits set in the resource map are in use.
302 * Each bit can represent a number of pages.
303 * LSbs represent lower addresses (IOVA's).
305 ***************************************************************/
306 #define PAGES_PER_RANGE 1 /* could increase this to 4 or 8 if needed */
308 /* Convert from IOVP to IOVA and vice versa. */
311 /* Pluto (aka ZX1) boxes need to set or clear the ibase bits appropriately */
312 #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((ioc->ibase) | (iovp) | (offset))
313 #define SBA_IOVP(ioc,iova) ((iova) & (ioc)->iovp_mask)
315 /* only support Astro and ancestors. Saves a few cycles in key places */
316 #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset))
317 #define SBA_IOVP(ioc,iova) (iova)
320 #define PDIR_INDEX(iovp) ((iovp)>>IOVP_SHIFT)
322 #define RESMAP_MASK(n) (~0UL << (BITS_PER_LONG - (n)))
323 #define RESMAP_IDX_MASK (sizeof(unsigned long) - 1)
325 static unsigned long ptr_to_pide(struct ioc *ioc, unsigned long *res_ptr,
326 unsigned int bitshiftcnt)
328 return (((unsigned long)res_ptr - (unsigned long)ioc->res_map) << 3)
333 * sba_search_bitmap - find free space in IO PDIR resource bitmap
334 * @ioc: IO MMU structure which owns the pdir we are interested in.
335 * @bits_wanted: number of entries we need.
337 * Find consecutive free bits in resource bitmap.
338 * Each bit represents one entry in the IO Pdir.
339 * Cool perf optimization: search for log2(size) bits at a time.
341 static SBA_INLINE unsigned long
342 sba_search_bitmap(struct ioc *ioc, struct device *dev,
343 unsigned long bits_wanted)
345 unsigned long *res_ptr = ioc->res_hint;
346 unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
347 unsigned long pide = ~0UL, tpide;
348 unsigned long boundary_size;
352 boundary_size = dma_get_seg_boundary_nr_pages(dev, IOVP_SHIFT);
354 #if defined(ZX1_SUPPORT)
355 BUG_ON(ioc->ibase & ~IOVP_MASK);
356 shift = ioc->ibase >> IOVP_SHIFT;
361 if (bits_wanted > (BITS_PER_LONG/2)) {
362 /* Search word at a time - no mask needed */
363 for(; res_ptr < res_end; ++res_ptr) {
364 tpide = ptr_to_pide(ioc, res_ptr, 0);
365 ret = iommu_is_span_boundary(tpide, bits_wanted,
368 if ((*res_ptr == 0) && !ret) {
369 *res_ptr = RESMAP_MASK(bits_wanted);
374 /* point to the next word on next pass */
376 ioc->res_bitshift = 0;
379 ** Search the resource bit map on well-aligned values.
380 ** "o" is the alignment.
381 ** We need the alignment to invalidate I/O TLB using
382 ** SBA HW features in the unmap path.
384 unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT);
385 uint bitshiftcnt = ALIGN(ioc->res_bitshift, o);
388 if (bitshiftcnt >= BITS_PER_LONG) {
392 mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;
394 DBG_RES("%s() o %ld %p", __func__, o, res_ptr);
395 while(res_ptr < res_end)
397 DBG_RES(" %p %lx %lx\n", res_ptr, mask, *res_ptr);
399 tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt);
400 ret = iommu_is_span_boundary(tpide, bits_wanted,
403 if ((((*res_ptr) & mask) == 0) && !ret) {
404 *res_ptr |= mask; /* mark resources busy! */
411 mask = RESMAP_MASK(bits_wanted);
416 /* look in the same word on the next pass */
417 ioc->res_bitshift = bitshiftcnt + bits_wanted;
421 if (res_end <= res_ptr) {
422 ioc->res_hint = (unsigned long *) ioc->res_map;
423 ioc->res_bitshift = 0;
425 ioc->res_hint = res_ptr;
432 * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
433 * @ioc: IO MMU structure which owns the pdir we are interested in.
434 * @size: number of bytes to create a mapping for
436 * Given a size, find consecutive unmarked and then mark those bits in the
440 sba_alloc_range(struct ioc *ioc, struct device *dev, size_t size)
442 unsigned int pages_needed = size >> IOVP_SHIFT;
443 #ifdef SBA_COLLECT_STATS
444 unsigned long cr_start = mfctl(16);
448 pide = sba_search_bitmap(ioc, dev, pages_needed);
449 if (pide >= (ioc->res_size << 3)) {
450 pide = sba_search_bitmap(ioc, dev, pages_needed);
451 if (pide >= (ioc->res_size << 3))
452 panic("%s: I/O MMU @ %p is out of mapping resources\n",
453 __FILE__, ioc->ioc_hpa);
456 #ifdef ASSERT_PDIR_SANITY
457 /* verify the first enable bit is clear */
458 if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) {
459 sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
463 DBG_RES("%s(%x) %d -> %lx hint %x/%x\n",
464 __func__, size, pages_needed, pide,
465 (uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
468 #ifdef SBA_COLLECT_STATS
470 unsigned long cr_end = mfctl(16);
471 unsigned long tmp = cr_end - cr_start;
472 /* check for roll over */
473 cr_start = (cr_end < cr_start) ? -(tmp) : (tmp);
475 ioc->avg_search[ioc->avg_idx++] = cr_start;
476 ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
478 ioc->used_pages += pages_needed;
486 * sba_free_range - unmark bits in IO PDIR resource bitmap
487 * @ioc: IO MMU structure which owns the pdir we are interested in.
488 * @iova: IO virtual address which was previously allocated.
489 * @size: number of bytes to create a mapping for
491 * clear bits in the ioc's resource map
493 static SBA_INLINE void
494 sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
496 unsigned long iovp = SBA_IOVP(ioc, iova);
497 unsigned int pide = PDIR_INDEX(iovp);
498 unsigned int ridx = pide >> 3; /* convert bit to byte address */
499 unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
501 int bits_not_wanted = size >> IOVP_SHIFT;
503 /* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
504 unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
506 DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n",
507 __func__, (uint) iova, size,
508 bits_not_wanted, m, pide, res_ptr, *res_ptr);
510 #ifdef SBA_COLLECT_STATS
511 ioc->used_pages -= bits_not_wanted;
518 /**************************************************************
520 * "Dynamic DMA Mapping" support (aka "Coherent I/O")
522 ***************************************************************/
524 #ifdef SBA_HINT_SUPPORT
525 #define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
528 typedef unsigned long space_t;
529 #define KERNEL_SPACE 0
532 * sba_io_pdir_entry - fill in one IO PDIR entry
533 * @pdir_ptr: pointer to IO PDIR entry
534 * @sid: process Space ID - currently only support KERNEL_SPACE
535 * @vba: Virtual CPU address of buffer to map
536 * @hint: DMA hint set to use for this mapping
538 * SBA Mapping Routine
540 * Given a virtual address (vba, arg2) and space id, (sid, arg1)
541 * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
543 * Using the bass-ackwards HP bit numbering, Each IO Pdir entry
544 * for Astro/Ike looks like:
548 * +-+---------------------+----------------------------------+----+--------+
549 * |V| U | PPN[43:12] | U | VI |
550 * +-+---------------------+----------------------------------+----+--------+
552 * Pluto is basically identical, supports fewer physical address bits:
555 * +-+------------------------+-------------------------------+----+--------+
556 * |V| U | PPN[39:12] | U | VI |
557 * +-+------------------------+-------------------------------+----+--------+
559 * V == Valid Bit (Most Significant Bit is bit 0)
561 * PPN == Physical Page Number
562 * VI == Virtual Index (aka Coherent Index)
564 * LPA instruction output is put into PPN field.
565 * LCI (Load Coherence Index) instruction provides the "VI" bits.
567 * We pre-swap the bytes since PCX-W is Big Endian and the
568 * IOMMU uses little endian for the pdir.
571 static void SBA_INLINE
572 sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
575 u64 pa; /* physical address */
576 register unsigned ci; /* coherent index */
581 asm("lci 0(%1), %0" : "=r" (ci) : "r" (vba));
582 pa |= (ci >> PAGE_SHIFT) & 0xff; /* move CI (8 bits) into lowest byte */
584 pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */
585 *pdir_ptr = cpu_to_le64(pa); /* swap and store into I/O Pdir */
588 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
589 * (bit #61, big endian), we have to flush and sync every time
590 * IO-PDIR is changed in Ike/Astro.
592 asm_io_fdc(pdir_ptr);
597 * sba_mark_invalid - invalidate one or more IO PDIR entries
598 * @ioc: IO MMU structure which owns the pdir we are interested in.
599 * @iova: IO Virtual Address mapped earlier
600 * @byte_cnt: number of bytes this mapping covers.
602 * Marking the IO PDIR entry(ies) as Invalid and invalidate
603 * corresponding IO TLB entry. The Ike PCOM (Purge Command Register)
604 * is to purge stale entries in the IO TLB when unmapping entries.
606 * The PCOM register supports purging of multiple pages, with a minium
607 * of 1 page and a maximum of 2GB. Hardware requires the address be
608 * aligned to the size of the range being purged. The size of the range
609 * must be a power of 2. The "Cool perf optimization" in the
610 * allocation routine helps keep that true.
612 static SBA_INLINE void
613 sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
615 u32 iovp = (u32) SBA_IOVP(ioc,iova);
616 u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
618 #ifdef ASSERT_PDIR_SANITY
619 /* Assert first pdir entry is set.
621 ** Even though this is a big-endian machine, the entries
622 ** in the iopdir are little endian. That's why we look at
623 ** the byte at +7 instead of at +0.
625 if (0x80 != (((u8 *) pdir_ptr)[7])) {
626 sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
630 if (byte_cnt > IOVP_SIZE)
633 unsigned long entries_per_cacheline = ioc_needs_fdc ?
634 L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
635 - (unsigned long) pdir_ptr;
639 /* set "size" field for PCOM */
640 iovp |= get_order(byte_cnt) + PAGE_SHIFT;
643 /* clear I/O Pdir entry "valid" bit first */
644 ((u8 *) pdir_ptr)[7] = 0;
645 asm_io_fdc(pdir_ptr);
648 entries_per_cacheline = L1_CACHE_SHIFT - 3;
652 byte_cnt -= IOVP_SIZE;
653 } while (byte_cnt > IOVP_SIZE);
655 iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
658 ** clear I/O PDIR entry "valid" bit.
659 ** We have to R/M/W the cacheline regardless how much of the
660 ** pdir entry that we clobber.
661 ** The rest of the entry would be useful for debugging if we
662 ** could dump core on HPMC.
664 ((u8 *) pdir_ptr)[7] = 0;
665 asm_io_fdc(pdir_ptr);
667 WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
671 * sba_dma_supported - PCI driver can query DMA support
672 * @dev: instance of PCI owned by the driver that's asking
673 * @mask: number of address bits this PCI device can handle
675 * See Documentation/core-api/dma-api-howto.rst
677 static int sba_dma_supported( struct device *dev, u64 mask)
682 printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
692 * check if mask is >= than the current max IO Virt Address
693 * The max IO Virt address will *always* < 30 bits.
695 return((int)(mask >= (ioc->ibase - 1 +
696 (ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
701 * sba_map_single - map one buffer and return IOVA for DMA
702 * @dev: instance of PCI owned by the driver that's asking.
703 * @addr: driver buffer to map.
704 * @size: number of bytes to map in driver buffer.
705 * @direction: R/W or both.
707 * See Documentation/core-api/dma-api-howto.rst
710 sba_map_single(struct device *dev, void *addr, size_t size,
711 enum dma_data_direction direction)
722 return DMA_MAPPING_ERROR;
724 /* save offset bits */
725 offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
727 /* round up to nearest IOVP_SIZE */
728 size = (size + offset + ~IOVP_MASK) & IOVP_MASK;
730 spin_lock_irqsave(&ioc->res_lock, flags);
731 #ifdef ASSERT_PDIR_SANITY
732 sba_check_pdir(ioc,"Check before sba_map_single()");
735 #ifdef SBA_COLLECT_STATS
736 ioc->msingle_calls++;
737 ioc->msingle_pages += size >> IOVP_SHIFT;
739 pide = sba_alloc_range(ioc, dev, size);
740 iovp = (dma_addr_t) pide << IOVP_SHIFT;
742 DBG_RUN("%s() 0x%p -> 0x%lx\n",
743 __func__, addr, (long) iovp | offset);
745 pdir_start = &(ioc->pdir_base[pide]);
748 sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr, 0);
750 DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x\n",
752 (u8) (((u8 *) pdir_start)[7]),
753 (u8) (((u8 *) pdir_start)[6]),
754 (u8) (((u8 *) pdir_start)[5]),
755 (u8) (((u8 *) pdir_start)[4]),
756 (u8) (((u8 *) pdir_start)[3]),
757 (u8) (((u8 *) pdir_start)[2]),
758 (u8) (((u8 *) pdir_start)[1]),
759 (u8) (((u8 *) pdir_start)[0])
767 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
770 #ifdef ASSERT_PDIR_SANITY
771 sba_check_pdir(ioc,"Check after sba_map_single()");
773 spin_unlock_irqrestore(&ioc->res_lock, flags);
775 /* form complete address */
776 return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
781 sba_map_page(struct device *dev, struct page *page, unsigned long offset,
782 size_t size, enum dma_data_direction direction,
785 return sba_map_single(dev, page_address(page) + offset, size,
791 * sba_unmap_page - unmap one IOVA and free resources
792 * @dev: instance of PCI owned by the driver that's asking.
793 * @iova: IOVA of driver buffer previously mapped.
794 * @size: number of bytes mapped in driver buffer.
795 * @direction: R/W or both.
797 * See Documentation/core-api/dma-api-howto.rst
800 sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
801 enum dma_data_direction direction, unsigned long attrs)
804 #if DELAYED_RESOURCE_CNT > 0
805 struct sba_dma_pair *d;
810 DBG_RUN("%s() iovp 0x%lx/%x\n", __func__, (long) iova, size);
817 offset = iova & ~IOVP_MASK;
818 iova ^= offset; /* clear offset bits */
820 size = ALIGN(size, IOVP_SIZE);
822 spin_lock_irqsave(&ioc->res_lock, flags);
824 #ifdef SBA_COLLECT_STATS
825 ioc->usingle_calls++;
826 ioc->usingle_pages += size >> IOVP_SHIFT;
829 sba_mark_invalid(ioc, iova, size);
831 #if DELAYED_RESOURCE_CNT > 0
832 /* Delaying when we re-use a IO Pdir entry reduces the number
833 * of MMIO reads needed to flush writes to the PCOM register.
835 d = &(ioc->saved[ioc->saved_cnt]);
838 if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
839 int cnt = ioc->saved_cnt;
841 sba_free_range(ioc, d->iova, d->size);
846 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
848 #else /* DELAYED_RESOURCE_CNT == 0 */
849 sba_free_range(ioc, iova, size);
851 /* If fdc's were issued, force fdc's to be visible now */
854 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
855 #endif /* DELAYED_RESOURCE_CNT == 0 */
857 spin_unlock_irqrestore(&ioc->res_lock, flags);
859 /* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
860 ** For Astro based systems this isn't a big deal WRT performance.
861 ** As long as 2.4 kernels copyin/copyout data from/to userspace,
862 ** we don't need the syncdma. The issue here is I/O MMU cachelines
863 ** are *not* coherent in all cases. May be hwrev dependent.
864 ** Need to investigate more.
865 asm volatile("syncdma");
871 * sba_alloc - allocate/map shared mem for DMA
872 * @hwdev: instance of PCI owned by the driver that's asking.
873 * @size: number of bytes mapped in driver buffer.
874 * @dma_handle: IOVA of new buffer.
876 * See Documentation/core-api/dma-api-howto.rst
878 static void *sba_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
879 gfp_t gfp, unsigned long attrs)
884 /* only support PCI */
889 ret = (void *) __get_free_pages(gfp, get_order(size));
892 memset(ret, 0, size);
893 *dma_handle = sba_map_single(hwdev, ret, size, 0);
901 * sba_free - free/unmap shared mem for DMA
902 * @hwdev: instance of PCI owned by the driver that's asking.
903 * @size: number of bytes mapped in driver buffer.
904 * @vaddr: virtual address IOVA of "consistent" buffer.
905 * @dma_handler: IO virtual address of "consistent" buffer.
907 * See Documentation/core-api/dma-api-howto.rst
910 sba_free(struct device *hwdev, size_t size, void *vaddr,
911 dma_addr_t dma_handle, unsigned long attrs)
913 sba_unmap_page(hwdev, dma_handle, size, 0, 0);
914 free_pages((unsigned long) vaddr, get_order(size));
919 ** Since 0 is a valid pdir_base index value, can't use that
920 ** to determine if a value is valid or not. Use a flag to indicate
921 ** the SG list entry contains a valid pdir index.
923 #define PIDE_FLAG 0x80000000UL
925 #ifdef SBA_COLLECT_STATS
926 #define IOMMU_MAP_STATS
928 #include "iommu-helpers.h"
930 #ifdef DEBUG_LARGE_SG_ENTRIES
936 * sba_map_sg - map Scatter/Gather list
937 * @dev: instance of PCI owned by the driver that's asking.
938 * @sglist: array of buffer/length pairs
939 * @nents: number of entries in list
940 * @direction: R/W or both.
942 * See Documentation/core-api/dma-api-howto.rst
945 sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
946 enum dma_data_direction direction, unsigned long attrs)
949 int coalesced, filled = 0;
952 DBG_RUN_SG("%s() START %d entries\n", __func__, nents);
958 /* Fast path single entry scatterlists. */
960 sg_dma_address(sglist) = sba_map_single(dev, sg_virt(sglist),
961 sglist->length, direction);
962 sg_dma_len(sglist) = sglist->length;
966 spin_lock_irqsave(&ioc->res_lock, flags);
968 #ifdef ASSERT_PDIR_SANITY
969 if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
971 sba_dump_sg(ioc, sglist, nents);
972 panic("Check before sba_map_sg()");
976 #ifdef SBA_COLLECT_STATS
981 ** First coalesce the chunks and allocate I/O pdir space
983 ** If this is one DMA stream, we can properly map using the
984 ** correct virtual address associated with each DMA page.
985 ** w/o this association, we wouldn't have coherent DMA!
986 ** Access to the virtual address is what forces a two pass algorithm.
988 coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range);
991 ** Program the I/O Pdir
993 ** map the virtual addresses to the I/O Pdir
994 ** o dma_address will contain the pdir index
995 ** o dma_len will contain the number of bytes to map
996 ** o address contains the virtual address.
998 filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry);
1000 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
1003 #ifdef ASSERT_PDIR_SANITY
1004 if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
1006 sba_dump_sg(ioc, sglist, nents);
1007 panic("Check after sba_map_sg()\n");
1011 spin_unlock_irqrestore(&ioc->res_lock, flags);
1013 DBG_RUN_SG("%s() DONE %d mappings\n", __func__, filled);
1020 * sba_unmap_sg - unmap Scatter/Gather list
1021 * @dev: instance of PCI owned by the driver that's asking.
1022 * @sglist: array of buffer/length pairs
1023 * @nents: number of entries in list
1024 * @direction: R/W or both.
1026 * See Documentation/core-api/dma-api-howto.rst
1029 sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
1030 enum dma_data_direction direction, unsigned long attrs)
1033 #ifdef ASSERT_PDIR_SANITY
1034 unsigned long flags;
1037 DBG_RUN_SG("%s() START %d entries, %p,%x\n",
1038 __func__, nents, sg_virt(sglist), sglist->length);
1046 #ifdef SBA_COLLECT_STATS
1050 #ifdef ASSERT_PDIR_SANITY
1051 spin_lock_irqsave(&ioc->res_lock, flags);
1052 sba_check_pdir(ioc,"Check before sba_unmap_sg()");
1053 spin_unlock_irqrestore(&ioc->res_lock, flags);
1056 while (nents && sg_dma_len(sglist)) {
1058 sba_unmap_page(dev, sg_dma_address(sglist), sg_dma_len(sglist),
1060 #ifdef SBA_COLLECT_STATS
1061 ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT;
1062 ioc->usingle_calls--; /* kluge since call is unmap_sg() */
1068 DBG_RUN_SG("%s() DONE (nents %d)\n", __func__, nents);
1070 #ifdef ASSERT_PDIR_SANITY
1071 spin_lock_irqsave(&ioc->res_lock, flags);
1072 sba_check_pdir(ioc,"Check after sba_unmap_sg()");
1073 spin_unlock_irqrestore(&ioc->res_lock, flags);
1078 static const struct dma_map_ops sba_ops = {
1079 .dma_supported = sba_dma_supported,
1082 .map_page = sba_map_page,
1083 .unmap_page = sba_unmap_page,
1084 .map_sg = sba_map_sg,
1085 .unmap_sg = sba_unmap_sg,
1086 .get_sgtable = dma_common_get_sgtable,
1087 .alloc_pages = dma_common_alloc_pages,
1088 .free_pages = dma_common_free_pages,
1092 /**************************************************************************
1094 ** SBA PAT PDC support
1096 ** o call pdc_pat_cell_module()
1097 ** o store ranges in PCI "resource" structures
1099 **************************************************************************/
1102 sba_get_pat_resources(struct sba_device *sba_dev)
1106 ** TODO/REVISIT/FIXME: support for directed ranges requires calls to
1107 ** PAT PDC to program the SBA/LBA directed range registers...this
1108 ** burden may fall on the LBA code since it directly supports the
1109 ** PCI subsystem. It's not clear yet. - ggg
1111 PAT_MOD(mod)->mod_info.mod_pages = PAT_GET_MOD_PAGES(temp);
1113 PAT_MOD(mod)->mod_info.dvi = PAT_GET_DVI(temp);
1114 Tells where the dvi bits are located in the address.
1115 PAT_MOD(mod)->mod_info.ioc = PAT_GET_IOC(temp);
1121 /**************************************************************
1123 * Initialization and claim
1125 ***************************************************************/
1126 #define PIRANHA_ADDR_MASK 0x00160000UL /* bit 17,18,20 */
1127 #define PIRANHA_ADDR_VAL 0x00060000UL /* bit 17,18 on */
1129 sba_alloc_pdir(unsigned int pdir_size)
1131 unsigned long pdir_base;
1132 unsigned long pdir_order = get_order(pdir_size);
1134 pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);
1135 if (NULL == (void *) pdir_base) {
1136 panic("%s() could not allocate I/O Page Table\n",
1140 /* If this is not PA8700 (PCX-W2)
1141 ** OR newer than ver 2.2
1142 ** OR in a system that doesn't need VINDEX bits from SBA,
1144 ** then we aren't exposed to the HW bug.
1146 if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13
1147 || (boot_cpu_data.pdc.versions > 0x202)
1148 || (boot_cpu_data.pdc.capabilities & 0x08L) )
1149 return (void *) pdir_base;
1152 * PA8700 (PCX-W2, aka piranha) silent data corruption fix
1154 * An interaction between PA8700 CPU (Ver 2.2 or older) and
1155 * Ike/Astro can cause silent data corruption. This is only
1156 * a problem if the I/O PDIR is located in memory such that
1157 * (little-endian) bits 17 and 18 are on and bit 20 is off.
1159 * Since the max IO Pdir size is 2MB, by cleverly allocating the
1160 * right physical address, we can either avoid (IOPDIR <= 1MB)
1161 * or minimize (2MB IO Pdir) the problem if we restrict the
1162 * IO Pdir to a maximum size of 2MB-128K (1902K).
1164 * Because we always allocate 2^N sized IO pdirs, either of the
1165 * "bad" regions will be the last 128K if at all. That's easy
1169 if (pdir_order <= (19-12)) {
1170 if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) {
1171 /* allocate a new one on 512k alignment */
1172 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12));
1173 /* release original */
1174 free_pages(pdir_base, pdir_order);
1176 pdir_base = new_pdir;
1178 /* release excess */
1179 while (pdir_order < (19-12)) {
1180 new_pdir += pdir_size;
1181 free_pages(new_pdir, pdir_order);
1189 ** Needs to be aligned on an "odd" 1MB boundary.
1191 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */
1193 /* release original */
1194 free_pages( pdir_base, pdir_order);
1196 /* release first 1MB */
1197 free_pages(new_pdir, 20-12);
1199 pdir_base = new_pdir + 1024*1024;
1201 if (pdir_order > (20-12)) {
1205 ** Flag tells init_bitmap() to mark bad 128k as used
1206 ** and to reduce the size by 128k.
1208 piranha_bad_128k = 1;
1210 new_pdir += 3*1024*1024;
1211 /* release last 1MB */
1212 free_pages(new_pdir, 20-12);
1214 /* release unusable 128KB */
1215 free_pages(new_pdir - 128*1024 , 17-12);
1217 pdir_size -= 128*1024;
1221 memset((void *) pdir_base, 0, pdir_size);
1222 return (void *) pdir_base;
1225 struct ibase_data_struct {
1230 static int setup_ibase_imask_callback(struct device *dev, void *data)
1232 /* lba_set_iregs() is in drivers/parisc/lba_pci.c */
1233 extern void lba_set_iregs(struct parisc_device *, u32, u32);
1234 struct parisc_device *lba = to_parisc_device(dev);
1235 struct ibase_data_struct *ibd = data;
1236 int rope_num = (lba->hpa.start >> 13) & 0xf;
1237 if (rope_num >> 3 == ibd->ioc_num)
1238 lba_set_iregs(lba, ibd->ioc->ibase, ibd->ioc->imask);
1242 /* setup Mercury or Elroy IBASE/IMASK registers. */
1244 setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1246 struct ibase_data_struct ibase_data = {
1251 device_for_each_child(&sba->dev, &ibase_data,
1252 setup_ibase_imask_callback);
1255 #ifdef SBA_AGP_SUPPORT
1257 sba_ioc_find_quicksilver(struct device *dev, void *data)
1259 int *agp_found = data;
1260 struct parisc_device *lba = to_parisc_device(dev);
1262 if (IS_QUICKSILVER(lba))
1269 sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1271 u32 iova_space_mask;
1272 u32 iova_space_size;
1273 int iov_order, tcnfg;
1274 #ifdef SBA_AGP_SUPPORT
1278 ** Firmware programs the base and size of a "safe IOVA space"
1279 ** (one that doesn't overlap memory or LMMIO space) in the
1280 ** IBASE and IMASK registers.
1282 ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE) & ~0x1fffffULL;
1283 iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
1285 if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {
1286 printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n");
1287 iova_space_size /= 2;
1291 ** iov_order is always based on a 1GB IOVA space since we want to
1292 ** turn on the other half for AGP GART.
1294 iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT));
1295 ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);
1297 DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)\n",
1298 __func__, ioc->ioc_hpa, iova_space_size >> 20,
1299 iov_order + PAGE_SHIFT);
1301 ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
1302 get_order(ioc->pdir_size));
1303 if (!ioc->pdir_base)
1304 panic("Couldn't allocate I/O Page Table\n");
1306 memset(ioc->pdir_base, 0, ioc->pdir_size);
1308 DBG_INIT("%s() pdir %p size %x\n",
1309 __func__, ioc->pdir_base, ioc->pdir_size);
1311 #ifdef SBA_HINT_SUPPORT
1312 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1313 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1315 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1316 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1319 WARN_ON((((unsigned long) ioc->pdir_base) & PAGE_MASK) != (unsigned long) ioc->pdir_base);
1320 WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1322 /* build IMASK for IOC and Elroy */
1323 iova_space_mask = 0xffffffff;
1324 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1325 ioc->imask = iova_space_mask;
1327 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1329 sba_dump_tlb(ioc->ioc_hpa);
1331 setup_ibase_imask(sba, ioc, ioc_num);
1333 WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);
1337 ** Setting the upper bits makes checking for bypass addresses
1338 ** a little faster later on.
1340 ioc->imask |= 0xFFFFFFFF00000000UL;
1343 /* Set I/O PDIR Page size to system page size */
1344 switch (PAGE_SHIFT) {
1345 case 12: tcnfg = 0; break; /* 4K */
1346 case 13: tcnfg = 1; break; /* 8K */
1347 case 14: tcnfg = 2; break; /* 16K */
1348 case 16: tcnfg = 3; break; /* 64K */
1350 panic(__FILE__ "Unsupported system page size %d",
1354 WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
1357 ** Program the IOC's ibase and enable IOVA translation
1358 ** Bit zero == enable bit.
1360 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE);
1363 ** Clear I/O TLB of any possible entries.
1364 ** (Yes. This is a bit paranoid...but so what)
1366 WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);
1368 #ifdef SBA_AGP_SUPPORT
1371 ** If an AGP device is present, only use half of the IOV space
1372 ** for PCI DMA. Unfortunately we can't know ahead of time
1373 ** whether GART support will actually be used, for now we
1374 ** can just key on any AGP device found in the system.
1375 ** We program the next pdir index after we stop w/ a key for
1376 ** the GART code to handshake on.
1378 device_for_each_child(&sba->dev, &agp_found, sba_ioc_find_quicksilver);
1380 if (agp_found && sba_reserve_agpgart) {
1381 printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart\n",
1382 __func__, (iova_space_size/2) >> 20);
1383 ioc->pdir_size /= 2;
1384 ioc->pdir_base[PDIR_INDEX(iova_space_size/2)] = SBA_AGPGART_COOKIE;
1386 #endif /*SBA_AGP_SUPPORT*/
1390 sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1392 u32 iova_space_size, iova_space_mask;
1393 unsigned int pdir_size, iov_order, tcnfg;
1396 ** Determine IOVA Space size from memory size.
1398 ** Ideally, PCI drivers would register the maximum number
1399 ** of DMA they can have outstanding for each device they
1400 ** own. Next best thing would be to guess how much DMA
1401 ** can be outstanding based on PCI Class/sub-class. Both
1402 ** methods still require some "extra" to support PCI
1403 ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
1405 ** While we have 32-bits "IOVA" space, top two 2 bits are used
1406 ** for DMA hints - ergo only 30 bits max.
1409 iova_space_size = (u32) (totalram_pages()/global_ioc_cnt);
1411 /* limit IOVA space size to 1MB-1GB */
1412 if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
1413 iova_space_size = 1 << (20 - PAGE_SHIFT);
1415 else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
1416 iova_space_size = 1 << (30 - PAGE_SHIFT);
1420 ** iova space must be log2() in size.
1421 ** thus, pdir/res_map will also be log2().
1422 ** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced)
1424 iov_order = get_order(iova_space_size << PAGE_SHIFT);
1426 /* iova_space_size is now bytes, not pages */
1427 iova_space_size = 1 << (iov_order + PAGE_SHIFT);
1429 ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64);
1431 DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n",
1434 (unsigned long) totalram_pages() >> (20 - PAGE_SHIFT),
1435 iova_space_size>>20,
1436 iov_order + PAGE_SHIFT);
1438 ioc->pdir_base = sba_alloc_pdir(pdir_size);
1440 DBG_INIT("%s() pdir %p size %x\n",
1441 __func__, ioc->pdir_base, pdir_size);
1443 #ifdef SBA_HINT_SUPPORT
1444 /* FIXME : DMA HINTs not used */
1445 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1446 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1448 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1449 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1452 WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1454 /* build IMASK for IOC and Elroy */
1455 iova_space_mask = 0xffffffff;
1456 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1459 ** On C3000 w/512MB mem, HP-UX 10.20 reports:
1460 ** ibase=0, imask=0xFE000000, size=0x2000000.
1463 ioc->imask = iova_space_mask; /* save it */
1465 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1468 DBG_INIT("%s() IOV base 0x%lx mask 0x%0lx\n",
1469 __func__, ioc->ibase, ioc->imask);
1472 ** FIXME: Hint registers are programmed with default hint
1473 ** values during boot, so hints should be sane even if we
1474 ** can't reprogram them the way drivers want.
1477 setup_ibase_imask(sba, ioc, ioc_num);
1480 ** Program the IOC's ibase and enable IOVA translation
1482 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE);
1483 WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
1485 /* Set I/O PDIR Page size to system page size */
1486 switch (PAGE_SHIFT) {
1487 case 12: tcnfg = 0; break; /* 4K */
1488 case 13: tcnfg = 1; break; /* 8K */
1489 case 14: tcnfg = 2; break; /* 16K */
1490 case 16: tcnfg = 3; break; /* 64K */
1492 panic(__FILE__ "Unsupported system page size %d",
1496 /* Set I/O PDIR Page size to PAGE_SIZE (4k/16k/...) */
1497 WRITE_REG(tcnfg, ioc->ioc_hpa+IOC_TCNFG);
1500 ** Clear I/O TLB of any possible entries.
1501 ** (Yes. This is a bit paranoid...but so what)
1503 WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM);
1505 ioc->ibase = 0; /* used by SBA_IOVA and related macros */
1507 DBG_INIT("%s() DONE\n", __func__);
1512 /**************************************************************************
1514 ** SBA initialization code (HW and SW)
1516 ** o identify SBA chip itself
1517 ** o initialize SBA chip modes (HardFail)
1518 ** o initialize SBA chip modes (HardFail)
1519 ** o FIXME: initialize DMA hints for reasonable defaults
1521 **************************************************************************/
1523 static void __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset)
1525 return ioremap(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE);
1528 static void sba_hw_init(struct sba_device *sba_dev)
1534 if (!is_pdc_pat()) {
1535 /* Shutdown the USB controller on Astro-based workstations.
1536 ** Once we reprogram the IOMMU, the next DMA performed by
1537 ** USB will HPMC the box. USB is only enabled if a
1538 ** keyboard is present and found.
1540 ** With serial console, j6k v5.0 firmware says:
1541 ** mem_kbd hpa 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7
1543 ** FIXME: Using GFX+USB console at power up but direct
1544 ** linux to serial console is still broken.
1545 ** USB could generate DMA so we must reset USB.
1546 ** The proper sequence would be:
1547 ** o block console output
1548 ** o reset USB device
1549 ** o reprogram serial port
1550 ** o unblock console output
1552 if (PAGE0->mem_kbd.cl_class == CL_KEYBD) {
1553 pdc_io_reset_devices();
1560 printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa,
1561 PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class);
1564 ** Need to deal with DMA from LAN.
1565 ** Maybe use page zero boot device as a handle to talk
1566 ** to PDC about which device to shutdown.
1568 ** Netbooting, j6k v5.0 firmware says:
1569 ** mem_boot hpa 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002
1570 ** ARGH! invalid class.
1572 if ((PAGE0->mem_boot.cl_class != CL_RANDOM)
1573 && (PAGE0->mem_boot.cl_class != CL_SEQU)) {
1578 if (!IS_PLUTO(sba_dev->dev)) {
1579 ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
1580 DBG_INIT("%s() hpa 0x%lx ioc_ctl 0x%Lx ->",
1581 __func__, sba_dev->sba_hpa, ioc_ctl);
1582 ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
1583 ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC;
1584 /* j6700 v1.6 firmware sets 0x294f */
1585 /* A500 firmware sets 0x4d */
1587 WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL);
1589 #ifdef DEBUG_SBA_INIT
1590 ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL);
1591 DBG_INIT(" 0x%Lx\n", ioc_ctl);
1595 if (IS_ASTRO(sba_dev->dev)) {
1597 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET);
1600 sba_dev->chip_resv.name = "Astro Intr Ack";
1601 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfef00000UL;
1602 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff000000UL - 1) ;
1603 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1606 } else if (IS_PLUTO(sba_dev->dev)) {
1609 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET);
1612 sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA";
1613 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfee00000UL;
1614 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff200000UL - 1);
1615 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1618 sba_dev->iommu_resv.name = "IOVA Space";
1619 sba_dev->iommu_resv.start = 0x40000000UL;
1620 sba_dev->iommu_resv.end = 0x50000000UL - 1;
1621 err = request_resource(&iomem_resource, &(sba_dev->iommu_resv));
1625 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0));
1626 sba_dev->ioc[1].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1));
1629 /* TODO - LOOKUP Ike/Stretch chipset mem map */
1631 /* XXX: What about Reo Grande? */
1633 sba_dev->num_ioc = num_ioc;
1634 for (i = 0; i < num_ioc; i++) {
1635 void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa;
1638 for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
1641 * Clear ROPE(N)_CONFIG AO bit.
1642 * Disables "NT Ordering" (~= !"Relaxed Ordering")
1643 * Overrides bit 1 in DMA Hint Sets.
1644 * Improves netperf UDP_STREAM by ~10% for bcm5701.
1646 if (IS_PLUTO(sba_dev->dev)) {
1647 void __iomem *rope_cfg;
1648 unsigned long cfg_val;
1650 rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
1651 cfg_val = READ_REG(rope_cfg);
1652 cfg_val &= ~IOC_ROPE_AO;
1653 WRITE_REG(cfg_val, rope_cfg);
1657 ** Make sure the box crashes on rope errors.
1659 WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
1662 /* flush out the last writes */
1663 READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
1665 DBG_INIT(" ioc[%d] ROPE_CFG 0x%Lx ROPE_DBG 0x%Lx\n",
1667 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40),
1668 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50)
1670 DBG_INIT(" STATUS_CONTROL 0x%Lx FLUSH_CTRL 0x%Lx\n",
1671 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108),
1672 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400)
1675 if (IS_PLUTO(sba_dev->dev)) {
1676 sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i);
1678 sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i);
1684 sba_common_init(struct sba_device *sba_dev)
1688 /* add this one to the head of the list (order doesn't matter)
1689 ** This will be useful for debugging - especially if we get coredumps
1691 sba_dev->next = sba_list;
1694 for(i=0; i< sba_dev->num_ioc; i++) {
1696 #ifdef DEBUG_DMB_TRAP
1697 extern void iterate_pages(unsigned long , unsigned long ,
1698 void (*)(pte_t * , unsigned long),
1700 void set_data_memory_break(pte_t * , unsigned long);
1702 /* resource map size dictated by pdir_size */
1703 res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */
1705 /* Second part of PIRANHA BUG */
1706 if (piranha_bad_128k) {
1707 res_size -= (128*1024)/sizeof(u64);
1710 res_size >>= 3; /* convert bit count to byte count */
1711 DBG_INIT("%s() res_size 0x%x\n",
1712 __func__, res_size);
1714 sba_dev->ioc[i].res_size = res_size;
1715 sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size));
1717 #ifdef DEBUG_DMB_TRAP
1718 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1719 set_data_memory_break, 0);
1722 if (NULL == sba_dev->ioc[i].res_map)
1724 panic("%s:%s() could not allocate resource map\n",
1725 __FILE__, __func__ );
1728 memset(sba_dev->ioc[i].res_map, 0, res_size);
1729 /* next available IOVP - circular search */
1730 sba_dev->ioc[i].res_hint = (unsigned long *)
1731 &(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]);
1733 #ifdef ASSERT_PDIR_SANITY
1734 /* Mark first bit busy - ie no IOVA 0 */
1735 sba_dev->ioc[i].res_map[0] = 0x80;
1736 sba_dev->ioc[i].pdir_base[0] = 0xeeffc0addbba0080ULL;
1739 /* Third (and last) part of PIRANHA BUG */
1740 if (piranha_bad_128k) {
1741 /* region from +1408K to +1536 is un-usable. */
1743 int idx_start = (1408*1024/sizeof(u64)) >> 3;
1744 int idx_end = (1536*1024/sizeof(u64)) >> 3;
1745 long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]);
1746 long *p_end = (long *) &(sba_dev->ioc[i].res_map[idx_end]);
1748 /* mark that part of the io pdir busy */
1749 while (p_start < p_end)
1754 #ifdef DEBUG_DMB_TRAP
1755 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1756 set_data_memory_break, 0);
1757 iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size,
1758 set_data_memory_break, 0);
1761 DBG_INIT("%s() %d res_map %x %p\n",
1762 __func__, i, res_size, sba_dev->ioc[i].res_map);
1765 spin_lock_init(&sba_dev->sba_lock);
1766 ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC;
1768 #ifdef DEBUG_SBA_INIT
1770 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
1771 * (bit #61, big endian), we have to flush and sync every time
1772 * IO-PDIR is changed in Ike/Astro.
1774 if (ioc_needs_fdc) {
1775 printk(KERN_INFO MODULE_NAME " FDC/SYNC required.\n");
1777 printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.\n");
1782 #ifdef CONFIG_PROC_FS
1783 static int sba_proc_info(struct seq_file *m, void *p)
1785 struct sba_device *sba_dev = sba_list;
1786 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1787 int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */
1788 #ifdef SBA_COLLECT_STATS
1789 unsigned long avg = 0, min, max;
1793 seq_printf(m, "%s rev %d.%d\n",
1795 (sba_dev->hw_rev & 0x7) + 1,
1796 (sba_dev->hw_rev & 0x18) >> 3);
1797 seq_printf(m, "IO PDIR size : %d bytes (%d entries)\n",
1798 (int)((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
1801 seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
1802 ioc->res_size, ioc->res_size << 3); /* 8 bits per byte */
1804 seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n",
1805 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
1806 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
1807 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE));
1810 seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n",
1812 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE + i*0x18),
1813 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK + i*0x18),
1814 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18));
1816 #ifdef SBA_COLLECT_STATS
1817 seq_printf(m, "IO PDIR entries : %ld free %ld used (%d%%)\n",
1818 total_pages - ioc->used_pages, ioc->used_pages,
1819 (int)(ioc->used_pages * 100 / total_pages));
1821 min = max = ioc->avg_search[0];
1822 for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
1823 avg += ioc->avg_search[i];
1824 if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
1825 if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
1827 avg /= SBA_SEARCH_SAMPLE;
1828 seq_printf(m, " Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
1831 seq_printf(m, "pci_map_single(): %12ld calls %12ld pages (avg %d/1000)\n",
1832 ioc->msingle_calls, ioc->msingle_pages,
1833 (int)((ioc->msingle_pages * 1000)/ioc->msingle_calls));
1835 /* KLUGE - unmap_sg calls unmap_single for each mapped page */
1836 min = ioc->usingle_calls;
1837 max = ioc->usingle_pages - ioc->usg_pages;
1838 seq_printf(m, "pci_unmap_single: %12ld calls %12ld pages (avg %d/1000)\n",
1839 min, max, (int)((max * 1000)/min));
1841 seq_printf(m, "pci_map_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1842 ioc->msg_calls, ioc->msg_pages,
1843 (int)((ioc->msg_pages * 1000)/ioc->msg_calls));
1845 seq_printf(m, "pci_unmap_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1846 ioc->usg_calls, ioc->usg_pages,
1847 (int)((ioc->usg_pages * 1000)/ioc->usg_calls));
1854 sba_proc_bitmap_info(struct seq_file *m, void *p)
1856 struct sba_device *sba_dev = sba_list;
1857 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1859 seq_hex_dump(m, " ", DUMP_PREFIX_NONE, 32, 4, ioc->res_map,
1860 ioc->res_size, false);
1865 #endif /* CONFIG_PROC_FS */
1867 static const struct parisc_device_id sba_tbl[] __initconst = {
1868 { HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb },
1869 { HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc },
1870 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc },
1871 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc },
1872 { HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc },
1876 static int sba_driver_callback(struct parisc_device *);
1878 static struct parisc_driver sba_driver __refdata = {
1879 .name = MODULE_NAME,
1880 .id_table = sba_tbl,
1881 .probe = sba_driver_callback,
1885 ** Determine if sba should claim this chip (return 0) or not (return 1).
1886 ** If so, initialize the chip and tell other partners in crime they
1889 static int __init sba_driver_callback(struct parisc_device *dev)
1891 struct sba_device *sba_dev;
1895 void __iomem *sba_addr = ioremap(dev->hpa.start, SBA_FUNC_SIZE);
1896 #ifdef CONFIG_PROC_FS
1897 struct proc_dir_entry *root;
1900 sba_dump_ranges(sba_addr);
1902 /* Read HW Rev First */
1903 func_class = READ_REG(sba_addr + SBA_FCLASS);
1905 if (IS_ASTRO(dev)) {
1906 unsigned long fclass;
1907 static char astro_rev[]="Astro ?.?";
1909 /* Astro is broken...Read HW Rev First */
1910 fclass = READ_REG(sba_addr);
1912 astro_rev[6] = '1' + (char) (fclass & 0x7);
1913 astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3);
1914 version = astro_rev;
1916 } else if (IS_IKE(dev)) {
1917 static char ike_rev[] = "Ike rev ?";
1918 ike_rev[8] = '0' + (char) (func_class & 0xff);
1920 } else if (IS_PLUTO(dev)) {
1921 static char pluto_rev[]="Pluto ?.?";
1922 pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4);
1923 pluto_rev[8] = '0' + (char) (func_class & 0x0f);
1924 version = pluto_rev;
1926 static char reo_rev[] = "REO rev ?";
1927 reo_rev[8] = '0' + (char) (func_class & 0xff);
1931 if (!global_ioc_cnt) {
1932 global_ioc_cnt = count_parisc_driver(&sba_driver);
1934 /* Astro and Pluto have one IOC per SBA */
1935 if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev)))
1936 global_ioc_cnt *= 2;
1939 printk(KERN_INFO "%s found %s at 0x%llx\n",
1940 MODULE_NAME, version, (unsigned long long)dev->hpa.start);
1942 sba_dev = kzalloc(sizeof(struct sba_device), GFP_KERNEL);
1944 printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device\n");
1948 parisc_set_drvdata(dev, sba_dev);
1950 for(i=0; i<MAX_IOC; i++)
1951 spin_lock_init(&(sba_dev->ioc[i].res_lock));
1954 sba_dev->hw_rev = func_class;
1955 sba_dev->name = dev->name;
1956 sba_dev->sba_hpa = sba_addr;
1958 sba_get_pat_resources(sba_dev);
1959 sba_hw_init(sba_dev);
1960 sba_common_init(sba_dev);
1962 hppa_dma_ops = &sba_ops;
1964 #ifdef CONFIG_PROC_FS
1965 switch (dev->id.hversion) {
1966 case PLUTO_MCKINLEY_PORT:
1967 root = proc_mckinley_root;
1969 case ASTRO_RUNWAY_PORT:
1970 case IKE_MERCED_PORT:
1972 root = proc_runway_root;
1976 proc_create_single("sba_iommu", 0, root, sba_proc_info);
1977 proc_create_single("sba_iommu-bitmap", 0, root, sba_proc_bitmap_info);
1983 ** One time initialization to let the world know the SBA was found.
1984 ** This is the only routine which is NOT static.
1985 ** Must be called exactly once before pci_init().
1987 void __init sba_init(void)
1989 register_parisc_driver(&sba_driver);
1994 * sba_get_iommu - Assign the iommu pointer for the pci bus controller.
1995 * @dev: The parisc device.
1997 * Returns the appropriate IOMMU data for the given parisc PCI controller.
1998 * This is cached and used later for PCI DMA Mapping.
2000 void * sba_get_iommu(struct parisc_device *pci_hba)
2002 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2003 struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2004 char t = sba_dev->id.hw_type;
2005 int iocnum = (pci_hba->hw_path >> 3); /* rope # */
2007 WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT));
2009 return &(sba->ioc[iocnum]);
2014 * sba_directed_lmmio - return first directed LMMIO range routed to rope
2015 * @pa_dev: The parisc device.
2016 * @r: resource PCI host controller wants start/end fields assigned.
2018 * For the given parisc PCI controller, determine if any direct ranges
2019 * are routed down the corresponding rope.
2021 void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
2023 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2024 struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2025 char t = sba_dev->id.hw_type;
2027 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2029 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2031 r->start = r->end = 0;
2033 /* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
2034 for (i=0; i<4; i++) {
2036 void __iomem *reg = sba->sba_hpa + i*0x18;
2038 base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
2039 if ((base & 1) == 0)
2040 continue; /* not enabled */
2042 size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);
2044 if ((size & (ROPES_PER_IOC-1)) != rope)
2045 continue; /* directed down different rope */
2047 r->start = (base & ~1UL) | PCI_F_EXTEND;
2048 size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
2049 r->end = r->start + size;
2050 r->flags = IORESOURCE_MEM;
2056 * sba_distributed_lmmio - return portion of distributed LMMIO range
2057 * @pa_dev: The parisc device.
2058 * @r: resource PCI host controller wants start/end fields assigned.
2060 * For the given parisc PCI controller, return portion of distributed LMMIO
2061 * range. The distributed LMMIO is always present and it's just a question
2062 * of the base address and size of the range.
2064 void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
2066 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2067 struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2068 char t = sba_dev->id.hw_type;
2070 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2072 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2074 r->start = r->end = 0;
2076 base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
2077 if ((base & 1) == 0) {
2078 BUG(); /* Gah! Distr Range wasn't enabled! */
2082 r->start = (base & ~1UL) | PCI_F_EXTEND;
2084 size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
2085 r->start += rope * (size + 1); /* adjust base for this rope */
2086 r->end = r->start + size;
2087 r->flags = IORESOURCE_MEM;