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 DEFAULT_DMA_HINT_REG 0
100 struct sba_device *sba_list;
101 EXPORT_SYMBOL_GPL(sba_list);
103 static unsigned long ioc_needs_fdc = 0;
105 /* global count of IOMMUs in the system */
106 static unsigned int global_ioc_cnt = 0;
108 /* PA8700 (Piranha 2.2) bug workaround */
109 static unsigned long piranha_bad_128k = 0;
111 /* Looks nice and keeps the compiler happy */
112 #define SBA_DEV(d) ((struct sba_device *) (d))
114 #ifdef CONFIG_AGP_PARISC
115 #define SBA_AGP_SUPPORT
116 #endif /*CONFIG_AGP_PARISC*/
118 #ifdef SBA_AGP_SUPPORT
119 static int sba_reserve_agpgart = 1;
120 module_param(sba_reserve_agpgart, int, 0444);
121 MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART");
124 struct proc_dir_entry *proc_runway_root __ro_after_init;
125 struct proc_dir_entry *proc_mckinley_root __ro_after_init;
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 * @dev: device to query the bitmap for
336 * @bits_wanted: number of entries we need.
338 * Find consecutive free bits in resource bitmap.
339 * Each bit represents one entry in the IO Pdir.
340 * Cool perf optimization: search for log2(size) bits at a time.
343 sba_search_bitmap(struct ioc *ioc, struct device *dev,
344 unsigned long bits_wanted)
346 unsigned long *res_ptr = ioc->res_hint;
347 unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
348 unsigned long pide = ~0UL, tpide;
349 unsigned long boundary_size;
353 boundary_size = dma_get_seg_boundary_nr_pages(dev, IOVP_SHIFT);
355 #if defined(ZX1_SUPPORT)
356 BUG_ON(ioc->ibase & ~IOVP_MASK);
357 shift = ioc->ibase >> IOVP_SHIFT;
362 if (bits_wanted > (BITS_PER_LONG/2)) {
363 /* Search word at a time - no mask needed */
364 for(; res_ptr < res_end; ++res_ptr) {
365 tpide = ptr_to_pide(ioc, res_ptr, 0);
366 ret = iommu_is_span_boundary(tpide, bits_wanted,
369 if ((*res_ptr == 0) && !ret) {
370 *res_ptr = RESMAP_MASK(bits_wanted);
375 /* point to the next word on next pass */
377 ioc->res_bitshift = 0;
380 ** Search the resource bit map on well-aligned values.
381 ** "o" is the alignment.
382 ** We need the alignment to invalidate I/O TLB using
383 ** SBA HW features in the unmap path.
385 unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT);
386 uint bitshiftcnt = ALIGN(ioc->res_bitshift, o);
389 if (bitshiftcnt >= BITS_PER_LONG) {
393 mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;
395 DBG_RES("%s() o %ld %p", __func__, o, res_ptr);
396 while(res_ptr < res_end)
398 DBG_RES(" %p %lx %lx\n", res_ptr, mask, *res_ptr);
400 tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt);
401 ret = iommu_is_span_boundary(tpide, bits_wanted,
404 if ((((*res_ptr) & mask) == 0) && !ret) {
405 *res_ptr |= mask; /* mark resources busy! */
412 mask = RESMAP_MASK(bits_wanted);
417 /* look in the same word on the next pass */
418 ioc->res_bitshift = bitshiftcnt + bits_wanted;
422 if (res_end <= res_ptr) {
423 ioc->res_hint = (unsigned long *) ioc->res_map;
424 ioc->res_bitshift = 0;
426 ioc->res_hint = res_ptr;
433 * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
434 * @ioc: IO MMU structure which owns the pdir we are interested in.
435 * @dev: device for which pages should be alloced
436 * @size: number of bytes to create a mapping for
438 * Given a size, find consecutive unmarked and then mark those bits in the
442 sba_alloc_range(struct ioc *ioc, struct device *dev, size_t size)
444 unsigned int pages_needed = size >> IOVP_SHIFT;
445 #ifdef SBA_COLLECT_STATS
446 unsigned long cr_start = mfctl(16);
450 pide = sba_search_bitmap(ioc, dev, pages_needed);
451 if (pide >= (ioc->res_size << 3)) {
452 pide = sba_search_bitmap(ioc, dev, pages_needed);
453 if (pide >= (ioc->res_size << 3))
454 panic("%s: I/O MMU @ %p is out of mapping resources\n",
455 __FILE__, ioc->ioc_hpa);
458 #ifdef ASSERT_PDIR_SANITY
459 /* verify the first enable bit is clear */
460 if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) {
461 sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
465 DBG_RES("%s(%x) %d -> %lx hint %x/%x\n",
466 __func__, size, pages_needed, pide,
467 (uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
470 #ifdef SBA_COLLECT_STATS
472 unsigned long cr_end = mfctl(16);
473 unsigned long tmp = cr_end - cr_start;
474 /* check for roll over */
475 cr_start = (cr_end < cr_start) ? -(tmp) : (tmp);
477 ioc->avg_search[ioc->avg_idx++] = cr_start;
478 ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
480 ioc->used_pages += pages_needed;
488 * sba_free_range - unmark bits in IO PDIR resource bitmap
489 * @ioc: IO MMU structure which owns the pdir we are interested in.
490 * @iova: IO virtual address which was previously allocated.
491 * @size: number of bytes to create a mapping for
493 * clear bits in the ioc's resource map
496 sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
498 unsigned long iovp = SBA_IOVP(ioc, iova);
499 unsigned int pide = PDIR_INDEX(iovp);
500 unsigned int ridx = pide >> 3; /* convert bit to byte address */
501 unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
503 int bits_not_wanted = size >> IOVP_SHIFT;
505 /* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
506 unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
508 DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n",
509 __func__, (uint) iova, size,
510 bits_not_wanted, m, pide, res_ptr, *res_ptr);
512 #ifdef SBA_COLLECT_STATS
513 ioc->used_pages -= bits_not_wanted;
520 /**************************************************************
522 * "Dynamic DMA Mapping" support (aka "Coherent I/O")
524 ***************************************************************/
526 #ifdef SBA_HINT_SUPPORT
527 #define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
530 typedef unsigned long space_t;
531 #define KERNEL_SPACE 0
534 * sba_io_pdir_entry - fill in one IO PDIR entry
535 * @pdir_ptr: pointer to IO PDIR entry
536 * @sid: process Space ID - currently only support KERNEL_SPACE
537 * @vba: Virtual CPU address of buffer to map
538 * @hint: DMA hint set to use for this mapping
540 * SBA Mapping Routine
542 * Given a virtual address (vba, arg2) and space id, (sid, arg1)
543 * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
545 * Using the bass-ackwards HP bit numbering, Each IO Pdir entry
546 * for Astro/Ike looks like:
550 * +-+---------------------+----------------------------------+----+--------+
551 * |V| U | PPN[43:12] | U | VI |
552 * +-+---------------------+----------------------------------+----+--------+
554 * Pluto is basically identical, supports fewer physical address bits:
557 * +-+------------------------+-------------------------------+----+--------+
558 * |V| U | PPN[39:12] | U | VI |
559 * +-+------------------------+-------------------------------+----+--------+
561 * V == Valid Bit (Most Significant Bit is bit 0)
563 * PPN == Physical Page Number
564 * VI == Virtual Index (aka Coherent Index)
566 * LPA instruction output is put into PPN field.
567 * LCI (Load Coherence Index) instruction provides the "VI" bits.
569 * We pre-swap the bytes since PCX-W is Big Endian and the
570 * IOMMU uses little endian for the pdir.
574 sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
577 u64 pa; /* physical address */
578 register unsigned ci; /* coherent index */
583 asm("lci 0(%1), %0" : "=r" (ci) : "r" (vba));
584 pa |= (ci >> PAGE_SHIFT) & 0xff; /* move CI (8 bits) into lowest byte */
586 pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */
587 *pdir_ptr = cpu_to_le64(pa); /* swap and store into I/O Pdir */
590 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
591 * (bit #61, big endian), we have to flush and sync every time
592 * IO-PDIR is changed in Ike/Astro.
594 asm_io_fdc(pdir_ptr);
599 * sba_mark_invalid - invalidate one or more IO PDIR entries
600 * @ioc: IO MMU structure which owns the pdir we are interested in.
601 * @iova: IO Virtual Address mapped earlier
602 * @byte_cnt: number of bytes this mapping covers.
604 * Marking the IO PDIR entry(ies) as Invalid and invalidate
605 * corresponding IO TLB entry. The Ike PCOM (Purge Command Register)
606 * is to purge stale entries in the IO TLB when unmapping entries.
608 * The PCOM register supports purging of multiple pages, with a minium
609 * of 1 page and a maximum of 2GB. Hardware requires the address be
610 * aligned to the size of the range being purged. The size of the range
611 * must be a power of 2. The "Cool perf optimization" in the
612 * allocation routine helps keep that true.
615 sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
617 u32 iovp = (u32) SBA_IOVP(ioc,iova);
618 u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
620 #ifdef ASSERT_PDIR_SANITY
621 /* Assert first pdir entry is set.
623 ** Even though this is a big-endian machine, the entries
624 ** in the iopdir are little endian. That's why we look at
625 ** the byte at +7 instead of at +0.
627 if (0x80 != (((u8 *) pdir_ptr)[7])) {
628 sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
632 if (byte_cnt > IOVP_SIZE)
635 unsigned long entries_per_cacheline = ioc_needs_fdc ?
636 L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
637 - (unsigned long) pdir_ptr;
641 /* set "size" field for PCOM */
642 iovp |= get_order(byte_cnt) + PAGE_SHIFT;
645 /* clear I/O Pdir entry "valid" bit first */
646 ((u8 *) pdir_ptr)[7] = 0;
647 asm_io_fdc(pdir_ptr);
650 entries_per_cacheline = L1_CACHE_SHIFT - 3;
654 byte_cnt -= IOVP_SIZE;
655 } while (byte_cnt > IOVP_SIZE);
657 iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
660 ** clear I/O PDIR entry "valid" bit.
661 ** We have to R/M/W the cacheline regardless how much of the
662 ** pdir entry that we clobber.
663 ** The rest of the entry would be useful for debugging if we
664 ** could dump core on HPMC.
666 ((u8 *) pdir_ptr)[7] = 0;
667 asm_io_fdc(pdir_ptr);
669 WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
673 * sba_dma_supported - PCI driver can query DMA support
674 * @dev: instance of PCI owned by the driver that's asking
675 * @mask: number of address bits this PCI device can handle
677 * See Documentation/core-api/dma-api-howto.rst
679 static int sba_dma_supported( struct device *dev, u64 mask)
684 printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
694 * check if mask is >= than the current max IO Virt Address
695 * The max IO Virt address will *always* < 30 bits.
697 return((int)(mask >= (ioc->ibase - 1 +
698 (ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
703 * sba_map_single - map one buffer and return IOVA for DMA
704 * @dev: instance of PCI owned by the driver that's asking.
705 * @addr: driver buffer to map.
706 * @size: number of bytes to map in driver buffer.
707 * @direction: R/W or both.
709 * See Documentation/core-api/dma-api-howto.rst
712 sba_map_single(struct device *dev, void *addr, size_t size,
713 enum dma_data_direction direction)
724 return DMA_MAPPING_ERROR;
726 /* save offset bits */
727 offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
729 /* round up to nearest IOVP_SIZE */
730 size = (size + offset + ~IOVP_MASK) & IOVP_MASK;
732 spin_lock_irqsave(&ioc->res_lock, flags);
733 #ifdef ASSERT_PDIR_SANITY
734 sba_check_pdir(ioc,"Check before sba_map_single()");
737 #ifdef SBA_COLLECT_STATS
738 ioc->msingle_calls++;
739 ioc->msingle_pages += size >> IOVP_SHIFT;
741 pide = sba_alloc_range(ioc, dev, size);
742 iovp = (dma_addr_t) pide << IOVP_SHIFT;
744 DBG_RUN("%s() 0x%p -> 0x%lx\n",
745 __func__, addr, (long) iovp | offset);
747 pdir_start = &(ioc->pdir_base[pide]);
750 sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr, 0);
752 DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x\n",
754 (u8) (((u8 *) pdir_start)[7]),
755 (u8) (((u8 *) pdir_start)[6]),
756 (u8) (((u8 *) pdir_start)[5]),
757 (u8) (((u8 *) pdir_start)[4]),
758 (u8) (((u8 *) pdir_start)[3]),
759 (u8) (((u8 *) pdir_start)[2]),
760 (u8) (((u8 *) pdir_start)[1]),
761 (u8) (((u8 *) pdir_start)[0])
769 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
772 #ifdef ASSERT_PDIR_SANITY
773 sba_check_pdir(ioc,"Check after sba_map_single()");
775 spin_unlock_irqrestore(&ioc->res_lock, flags);
777 /* form complete address */
778 return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
783 sba_map_page(struct device *dev, struct page *page, unsigned long offset,
784 size_t size, enum dma_data_direction direction,
787 return sba_map_single(dev, page_address(page) + offset, size,
793 * sba_unmap_page - unmap one IOVA and free resources
794 * @dev: instance of PCI owned by the driver that's asking.
795 * @iova: IOVA of driver buffer previously mapped.
796 * @size: number of bytes mapped in driver buffer.
797 * @direction: R/W or both.
800 * See Documentation/core-api/dma-api-howto.rst
803 sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
804 enum dma_data_direction direction, unsigned long attrs)
807 #if DELAYED_RESOURCE_CNT > 0
808 struct sba_dma_pair *d;
813 DBG_RUN("%s() iovp 0x%lx/%x\n", __func__, (long) iova, size);
820 offset = iova & ~IOVP_MASK;
821 iova ^= offset; /* clear offset bits */
823 size = ALIGN(size, IOVP_SIZE);
825 spin_lock_irqsave(&ioc->res_lock, flags);
827 #ifdef SBA_COLLECT_STATS
828 ioc->usingle_calls++;
829 ioc->usingle_pages += size >> IOVP_SHIFT;
832 sba_mark_invalid(ioc, iova, size);
834 #if DELAYED_RESOURCE_CNT > 0
835 /* Delaying when we re-use a IO Pdir entry reduces the number
836 * of MMIO reads needed to flush writes to the PCOM register.
838 d = &(ioc->saved[ioc->saved_cnt]);
841 if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
842 int cnt = ioc->saved_cnt;
844 sba_free_range(ioc, d->iova, d->size);
849 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
851 #else /* DELAYED_RESOURCE_CNT == 0 */
852 sba_free_range(ioc, iova, size);
854 /* If fdc's were issued, force fdc's to be visible now */
857 READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
858 #endif /* DELAYED_RESOURCE_CNT == 0 */
860 spin_unlock_irqrestore(&ioc->res_lock, flags);
862 /* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
863 ** For Astro based systems this isn't a big deal WRT performance.
864 ** As long as 2.4 kernels copyin/copyout data from/to userspace,
865 ** we don't need the syncdma. The issue here is I/O MMU cachelines
866 ** are *not* coherent in all cases. May be hwrev dependent.
867 ** Need to investigate more.
868 asm volatile("syncdma");
874 * sba_alloc - allocate/map shared mem for DMA
875 * @hwdev: instance of PCI owned by the driver that's asking.
876 * @size: number of bytes mapped in driver buffer.
877 * @dma_handle: IOVA of new buffer.
878 * @gfp: allocation flags
881 * See Documentation/core-api/dma-api-howto.rst
883 static void *sba_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
884 gfp_t gfp, unsigned long attrs)
889 /* only support PCI */
894 ret = (void *) __get_free_pages(gfp, get_order(size));
897 memset(ret, 0, size);
898 *dma_handle = sba_map_single(hwdev, ret, size, 0);
906 * sba_free - free/unmap shared mem for DMA
907 * @hwdev: instance of PCI owned by the driver that's asking.
908 * @size: number of bytes mapped in driver buffer.
909 * @vaddr: virtual address IOVA of "consistent" buffer.
910 * @dma_handle: IO virtual address of "consistent" buffer.
913 * See Documentation/core-api/dma-api-howto.rst
916 sba_free(struct device *hwdev, size_t size, void *vaddr,
917 dma_addr_t dma_handle, unsigned long attrs)
919 sba_unmap_page(hwdev, dma_handle, size, 0, 0);
920 free_pages((unsigned long) vaddr, get_order(size));
925 ** Since 0 is a valid pdir_base index value, can't use that
926 ** to determine if a value is valid or not. Use a flag to indicate
927 ** the SG list entry contains a valid pdir index.
929 #define PIDE_FLAG 0x80000000UL
931 #ifdef SBA_COLLECT_STATS
932 #define IOMMU_MAP_STATS
934 #include "iommu-helpers.h"
936 #ifdef DEBUG_LARGE_SG_ENTRIES
942 * sba_map_sg - map Scatter/Gather list
943 * @dev: instance of PCI owned by the driver that's asking.
944 * @sglist: array of buffer/length pairs
945 * @nents: number of entries in list
946 * @direction: R/W or both.
949 * See Documentation/core-api/dma-api-howto.rst
952 sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
953 enum dma_data_direction direction, unsigned long attrs)
959 DBG_RUN_SG("%s() START %d entries\n", __func__, nents);
965 /* Fast path single entry scatterlists. */
967 sg_dma_address(sglist) = sba_map_single(dev, sg_virt(sglist),
968 sglist->length, direction);
969 sg_dma_len(sglist) = sglist->length;
973 spin_lock_irqsave(&ioc->res_lock, flags);
975 #ifdef ASSERT_PDIR_SANITY
976 if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
978 sba_dump_sg(ioc, sglist, nents);
979 panic("Check before sba_map_sg()");
983 #ifdef SBA_COLLECT_STATS
988 ** First coalesce the chunks and allocate I/O pdir space
990 ** If this is one DMA stream, we can properly map using the
991 ** correct virtual address associated with each DMA page.
992 ** w/o this association, we wouldn't have coherent DMA!
993 ** Access to the virtual address is what forces a two pass algorithm.
995 iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range);
998 ** Program the I/O Pdir
1000 ** map the virtual addresses to the I/O Pdir
1001 ** o dma_address will contain the pdir index
1002 ** o dma_len will contain the number of bytes to map
1003 ** o address contains the virtual address.
1005 filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry);
1007 /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
1010 #ifdef ASSERT_PDIR_SANITY
1011 if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
1013 sba_dump_sg(ioc, sglist, nents);
1014 panic("Check after sba_map_sg()\n");
1018 spin_unlock_irqrestore(&ioc->res_lock, flags);
1020 DBG_RUN_SG("%s() DONE %d mappings\n", __func__, filled);
1027 * sba_unmap_sg - unmap Scatter/Gather list
1028 * @dev: instance of PCI owned by the driver that's asking.
1029 * @sglist: array of buffer/length pairs
1030 * @nents: number of entries in list
1031 * @direction: R/W or both.
1032 * @attrs: attributes
1034 * See Documentation/core-api/dma-api-howto.rst
1037 sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
1038 enum dma_data_direction direction, unsigned long attrs)
1041 #ifdef ASSERT_PDIR_SANITY
1042 unsigned long flags;
1045 DBG_RUN_SG("%s() START %d entries, %p,%x\n",
1046 __func__, nents, sg_virt(sglist), sglist->length);
1054 #ifdef SBA_COLLECT_STATS
1058 #ifdef ASSERT_PDIR_SANITY
1059 spin_lock_irqsave(&ioc->res_lock, flags);
1060 sba_check_pdir(ioc,"Check before sba_unmap_sg()");
1061 spin_unlock_irqrestore(&ioc->res_lock, flags);
1064 while (nents && sg_dma_len(sglist)) {
1066 sba_unmap_page(dev, sg_dma_address(sglist), sg_dma_len(sglist),
1068 #ifdef SBA_COLLECT_STATS
1069 ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT;
1070 ioc->usingle_calls--; /* kluge since call is unmap_sg() */
1076 DBG_RUN_SG("%s() DONE (nents %d)\n", __func__, nents);
1078 #ifdef ASSERT_PDIR_SANITY
1079 spin_lock_irqsave(&ioc->res_lock, flags);
1080 sba_check_pdir(ioc,"Check after sba_unmap_sg()");
1081 spin_unlock_irqrestore(&ioc->res_lock, flags);
1086 static const struct dma_map_ops sba_ops = {
1087 .dma_supported = sba_dma_supported,
1090 .map_page = sba_map_page,
1091 .unmap_page = sba_unmap_page,
1092 .map_sg = sba_map_sg,
1093 .unmap_sg = sba_unmap_sg,
1094 .get_sgtable = dma_common_get_sgtable,
1095 .alloc_pages = dma_common_alloc_pages,
1096 .free_pages = dma_common_free_pages,
1100 /**************************************************************************
1102 ** SBA PAT PDC support
1104 ** o call pdc_pat_cell_module()
1105 ** o store ranges in PCI "resource" structures
1107 **************************************************************************/
1110 sba_get_pat_resources(struct sba_device *sba_dev)
1114 ** TODO/REVISIT/FIXME: support for directed ranges requires calls to
1115 ** PAT PDC to program the SBA/LBA directed range registers...this
1116 ** burden may fall on the LBA code since it directly supports the
1117 ** PCI subsystem. It's not clear yet. - ggg
1119 PAT_MOD(mod)->mod_info.mod_pages = PAT_GET_MOD_PAGES(temp);
1121 PAT_MOD(mod)->mod_info.dvi = PAT_GET_DVI(temp);
1122 Tells where the dvi bits are located in the address.
1123 PAT_MOD(mod)->mod_info.ioc = PAT_GET_IOC(temp);
1129 /**************************************************************
1131 * Initialization and claim
1133 ***************************************************************/
1134 #define PIRANHA_ADDR_MASK 0x00160000UL /* bit 17,18,20 */
1135 #define PIRANHA_ADDR_VAL 0x00060000UL /* bit 17,18 on */
1137 sba_alloc_pdir(unsigned int pdir_size)
1139 unsigned long pdir_base;
1140 unsigned long pdir_order = get_order(pdir_size);
1142 pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);
1143 if (NULL == (void *) pdir_base) {
1144 panic("%s() could not allocate I/O Page Table\n",
1148 /* If this is not PA8700 (PCX-W2)
1149 ** OR newer than ver 2.2
1150 ** OR in a system that doesn't need VINDEX bits from SBA,
1152 ** then we aren't exposed to the HW bug.
1154 if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13
1155 || (boot_cpu_data.pdc.versions > 0x202)
1156 || (boot_cpu_data.pdc.capabilities & 0x08L) )
1157 return (void *) pdir_base;
1160 * PA8700 (PCX-W2, aka piranha) silent data corruption fix
1162 * An interaction between PA8700 CPU (Ver 2.2 or older) and
1163 * Ike/Astro can cause silent data corruption. This is only
1164 * a problem if the I/O PDIR is located in memory such that
1165 * (little-endian) bits 17 and 18 are on and bit 20 is off.
1167 * Since the max IO Pdir size is 2MB, by cleverly allocating the
1168 * right physical address, we can either avoid (IOPDIR <= 1MB)
1169 * or minimize (2MB IO Pdir) the problem if we restrict the
1170 * IO Pdir to a maximum size of 2MB-128K (1902K).
1172 * Because we always allocate 2^N sized IO pdirs, either of the
1173 * "bad" regions will be the last 128K if at all. That's easy
1177 if (pdir_order <= (19-12)) {
1178 if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) {
1179 /* allocate a new one on 512k alignment */
1180 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12));
1181 /* release original */
1182 free_pages(pdir_base, pdir_order);
1184 pdir_base = new_pdir;
1186 /* release excess */
1187 while (pdir_order < (19-12)) {
1188 new_pdir += pdir_size;
1189 free_pages(new_pdir, pdir_order);
1197 ** Needs to be aligned on an "odd" 1MB boundary.
1199 unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */
1201 /* release original */
1202 free_pages( pdir_base, pdir_order);
1204 /* release first 1MB */
1205 free_pages(new_pdir, 20-12);
1207 pdir_base = new_pdir + 1024*1024;
1209 if (pdir_order > (20-12)) {
1213 ** Flag tells init_bitmap() to mark bad 128k as used
1214 ** and to reduce the size by 128k.
1216 piranha_bad_128k = 1;
1218 new_pdir += 3*1024*1024;
1219 /* release last 1MB */
1220 free_pages(new_pdir, 20-12);
1222 /* release unusable 128KB */
1223 free_pages(new_pdir - 128*1024 , 17-12);
1225 pdir_size -= 128*1024;
1229 memset((void *) pdir_base, 0, pdir_size);
1230 return (void *) pdir_base;
1233 struct ibase_data_struct {
1238 static int setup_ibase_imask_callback(struct device *dev, void *data)
1240 struct parisc_device *lba = to_parisc_device(dev);
1241 struct ibase_data_struct *ibd = data;
1242 int rope_num = (lba->hpa.start >> 13) & 0xf;
1243 if (rope_num >> 3 == ibd->ioc_num)
1244 lba_set_iregs(lba, ibd->ioc->ibase, ibd->ioc->imask);
1248 /* setup Mercury or Elroy IBASE/IMASK registers. */
1250 setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1252 struct ibase_data_struct ibase_data = {
1257 device_for_each_child(&sba->dev, &ibase_data,
1258 setup_ibase_imask_callback);
1261 #ifdef SBA_AGP_SUPPORT
1263 sba_ioc_find_quicksilver(struct device *dev, void *data)
1265 int *agp_found = data;
1266 struct parisc_device *lba = to_parisc_device(dev);
1268 if (IS_QUICKSILVER(lba))
1275 sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1277 u32 iova_space_mask;
1278 u32 iova_space_size;
1279 int iov_order, tcnfg;
1280 #ifdef SBA_AGP_SUPPORT
1284 ** Firmware programs the base and size of a "safe IOVA space"
1285 ** (one that doesn't overlap memory or LMMIO space) in the
1286 ** IBASE and IMASK registers.
1288 ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE) & ~0x1fffffULL;
1289 iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
1291 if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {
1292 printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n");
1293 iova_space_size /= 2;
1297 ** iov_order is always based on a 1GB IOVA space since we want to
1298 ** turn on the other half for AGP GART.
1300 iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT));
1301 ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);
1303 DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)\n",
1304 __func__, ioc->ioc_hpa, iova_space_size >> 20,
1305 iov_order + PAGE_SHIFT);
1307 ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
1308 get_order(ioc->pdir_size));
1309 if (!ioc->pdir_base)
1310 panic("Couldn't allocate I/O Page Table\n");
1312 memset(ioc->pdir_base, 0, ioc->pdir_size);
1314 DBG_INIT("%s() pdir %p size %x\n",
1315 __func__, ioc->pdir_base, ioc->pdir_size);
1317 #ifdef SBA_HINT_SUPPORT
1318 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1319 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1321 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1322 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1325 WARN_ON((((unsigned long) ioc->pdir_base) & PAGE_MASK) != (unsigned long) ioc->pdir_base);
1326 WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1328 /* build IMASK for IOC and Elroy */
1329 iova_space_mask = 0xffffffff;
1330 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1331 ioc->imask = iova_space_mask;
1333 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1335 sba_dump_tlb(ioc->ioc_hpa);
1337 setup_ibase_imask(sba, ioc, ioc_num);
1339 WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);
1343 ** Setting the upper bits makes checking for bypass addresses
1344 ** a little faster later on.
1346 ioc->imask |= 0xFFFFFFFF00000000UL;
1349 /* Set I/O PDIR Page size to system page size */
1350 switch (PAGE_SHIFT) {
1351 case 12: tcnfg = 0; break; /* 4K */
1352 case 13: tcnfg = 1; break; /* 8K */
1353 case 14: tcnfg = 2; break; /* 16K */
1354 case 16: tcnfg = 3; break; /* 64K */
1356 panic(__FILE__ "Unsupported system page size %d",
1360 WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
1363 ** Program the IOC's ibase and enable IOVA translation
1364 ** Bit zero == enable bit.
1366 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE);
1369 ** Clear I/O TLB of any possible entries.
1370 ** (Yes. This is a bit paranoid...but so what)
1372 WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);
1374 #ifdef SBA_AGP_SUPPORT
1377 ** If an AGP device is present, only use half of the IOV space
1378 ** for PCI DMA. Unfortunately we can't know ahead of time
1379 ** whether GART support will actually be used, for now we
1380 ** can just key on any AGP device found in the system.
1381 ** We program the next pdir index after we stop w/ a key for
1382 ** the GART code to handshake on.
1384 device_for_each_child(&sba->dev, &agp_found, sba_ioc_find_quicksilver);
1386 if (agp_found && sba_reserve_agpgart) {
1387 printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart\n",
1388 __func__, (iova_space_size/2) >> 20);
1389 ioc->pdir_size /= 2;
1390 ioc->pdir_base[PDIR_INDEX(iova_space_size/2)] = SBA_AGPGART_COOKIE;
1392 #endif /*SBA_AGP_SUPPORT*/
1396 sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
1398 u32 iova_space_size, iova_space_mask;
1399 unsigned int pdir_size, iov_order, tcnfg;
1402 ** Determine IOVA Space size from memory size.
1404 ** Ideally, PCI drivers would register the maximum number
1405 ** of DMA they can have outstanding for each device they
1406 ** own. Next best thing would be to guess how much DMA
1407 ** can be outstanding based on PCI Class/sub-class. Both
1408 ** methods still require some "extra" to support PCI
1409 ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
1411 ** While we have 32-bits "IOVA" space, top two 2 bits are used
1412 ** for DMA hints - ergo only 30 bits max.
1415 iova_space_size = (u32) (totalram_pages()/global_ioc_cnt);
1417 /* limit IOVA space size to 1MB-1GB */
1418 if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
1419 iova_space_size = 1 << (20 - PAGE_SHIFT);
1421 else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
1422 iova_space_size = 1 << (30 - PAGE_SHIFT);
1426 ** iova space must be log2() in size.
1427 ** thus, pdir/res_map will also be log2().
1428 ** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced)
1430 iov_order = get_order(iova_space_size << PAGE_SHIFT);
1432 /* iova_space_size is now bytes, not pages */
1433 iova_space_size = 1 << (iov_order + PAGE_SHIFT);
1435 ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64);
1437 DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n",
1440 (unsigned long) totalram_pages() >> (20 - PAGE_SHIFT),
1441 iova_space_size>>20,
1442 iov_order + PAGE_SHIFT);
1444 ioc->pdir_base = sba_alloc_pdir(pdir_size);
1446 DBG_INIT("%s() pdir %p size %x\n",
1447 __func__, ioc->pdir_base, pdir_size);
1449 #ifdef SBA_HINT_SUPPORT
1450 /* FIXME : DMA HINTs not used */
1451 ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
1452 ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
1454 DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n",
1455 ioc->hint_shift_pdir, ioc->hint_mask_pdir);
1458 WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
1460 /* build IMASK for IOC and Elroy */
1461 iova_space_mask = 0xffffffff;
1462 iova_space_mask <<= (iov_order + PAGE_SHIFT);
1465 ** On C3000 w/512MB mem, HP-UX 10.20 reports:
1466 ** ibase=0, imask=0xFE000000, size=0x2000000.
1469 ioc->imask = iova_space_mask; /* save it */
1471 ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1);
1474 DBG_INIT("%s() IOV base 0x%lx mask 0x%0lx\n",
1475 __func__, ioc->ibase, ioc->imask);
1478 ** FIXME: Hint registers are programmed with default hint
1479 ** values during boot, so hints should be sane even if we
1480 ** can't reprogram them the way drivers want.
1483 setup_ibase_imask(sba, ioc, ioc_num);
1486 ** Program the IOC's ibase and enable IOVA translation
1488 WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE);
1489 WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
1491 /* Set I/O PDIR Page size to system page size */
1492 switch (PAGE_SHIFT) {
1493 case 12: tcnfg = 0; break; /* 4K */
1494 case 13: tcnfg = 1; break; /* 8K */
1495 case 14: tcnfg = 2; break; /* 16K */
1496 case 16: tcnfg = 3; break; /* 64K */
1498 panic(__FILE__ "Unsupported system page size %d",
1502 /* Set I/O PDIR Page size to PAGE_SIZE (4k/16k/...) */
1503 WRITE_REG(tcnfg, ioc->ioc_hpa+IOC_TCNFG);
1506 ** Clear I/O TLB of any possible entries.
1507 ** (Yes. This is a bit paranoid...but so what)
1509 WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM);
1511 ioc->ibase = 0; /* used by SBA_IOVA and related macros */
1513 DBG_INIT("%s() DONE\n", __func__);
1518 /**************************************************************************
1520 ** SBA initialization code (HW and SW)
1522 ** o identify SBA chip itself
1523 ** o initialize SBA chip modes (HardFail)
1524 ** o initialize SBA chip modes (HardFail)
1525 ** o FIXME: initialize DMA hints for reasonable defaults
1527 **************************************************************************/
1529 static void __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset)
1531 return ioremap(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE);
1534 static void sba_hw_init(struct sba_device *sba_dev)
1540 if (!is_pdc_pat()) {
1541 /* Shutdown the USB controller on Astro-based workstations.
1542 ** Once we reprogram the IOMMU, the next DMA performed by
1543 ** USB will HPMC the box. USB is only enabled if a
1544 ** keyboard is present and found.
1546 ** With serial console, j6k v5.0 firmware says:
1547 ** mem_kbd hpa 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7
1549 ** FIXME: Using GFX+USB console at power up but direct
1550 ** linux to serial console is still broken.
1551 ** USB could generate DMA so we must reset USB.
1552 ** The proper sequence would be:
1553 ** o block console output
1554 ** o reset USB device
1555 ** o reprogram serial port
1556 ** o unblock console output
1558 if (PAGE0->mem_kbd.cl_class == CL_KEYBD) {
1559 pdc_io_reset_devices();
1566 printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa,
1567 PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class);
1570 ** Need to deal with DMA from LAN.
1571 ** Maybe use page zero boot device as a handle to talk
1572 ** to PDC about which device to shutdown.
1574 ** Netbooting, j6k v5.0 firmware says:
1575 ** mem_boot hpa 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002
1576 ** ARGH! invalid class.
1578 if ((PAGE0->mem_boot.cl_class != CL_RANDOM)
1579 && (PAGE0->mem_boot.cl_class != CL_SEQU)) {
1584 if (!IS_PLUTO(sba_dev->dev)) {
1585 ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
1586 DBG_INIT("%s() hpa 0x%lx ioc_ctl 0x%Lx ->",
1587 __func__, sba_dev->sba_hpa, ioc_ctl);
1588 ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
1589 ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC;
1590 /* j6700 v1.6 firmware sets 0x294f */
1591 /* A500 firmware sets 0x4d */
1593 WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL);
1595 #ifdef DEBUG_SBA_INIT
1596 ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL);
1597 DBG_INIT(" 0x%Lx\n", ioc_ctl);
1601 if (IS_ASTRO(sba_dev->dev)) {
1603 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET);
1606 sba_dev->chip_resv.name = "Astro Intr Ack";
1607 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfef00000UL;
1608 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff000000UL - 1) ;
1609 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1612 } else if (IS_PLUTO(sba_dev->dev)) {
1615 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET);
1618 sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA";
1619 sba_dev->chip_resv.start = PCI_F_EXTEND | 0xfee00000UL;
1620 sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff200000UL - 1);
1621 err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
1624 sba_dev->iommu_resv.name = "IOVA Space";
1625 sba_dev->iommu_resv.start = 0x40000000UL;
1626 sba_dev->iommu_resv.end = 0x50000000UL - 1;
1627 err = request_resource(&iomem_resource, &(sba_dev->iommu_resv));
1631 sba_dev->ioc[0].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0));
1632 sba_dev->ioc[1].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1));
1635 /* TODO - LOOKUP Ike/Stretch chipset mem map */
1637 /* XXX: What about Reo Grande? */
1639 sba_dev->num_ioc = num_ioc;
1640 for (i = 0; i < num_ioc; i++) {
1641 void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa;
1644 for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
1647 * Clear ROPE(N)_CONFIG AO bit.
1648 * Disables "NT Ordering" (~= !"Relaxed Ordering")
1649 * Overrides bit 1 in DMA Hint Sets.
1650 * Improves netperf UDP_STREAM by ~10% for bcm5701.
1652 if (IS_PLUTO(sba_dev->dev)) {
1653 void __iomem *rope_cfg;
1654 unsigned long cfg_val;
1656 rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
1657 cfg_val = READ_REG(rope_cfg);
1658 cfg_val &= ~IOC_ROPE_AO;
1659 WRITE_REG(cfg_val, rope_cfg);
1663 ** Make sure the box crashes on rope errors.
1665 WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
1668 /* flush out the last writes */
1669 READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
1671 DBG_INIT(" ioc[%d] ROPE_CFG 0x%Lx ROPE_DBG 0x%Lx\n",
1673 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40),
1674 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50)
1676 DBG_INIT(" STATUS_CONTROL 0x%Lx FLUSH_CTRL 0x%Lx\n",
1677 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108),
1678 READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400)
1681 if (IS_PLUTO(sba_dev->dev)) {
1682 sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i);
1684 sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i);
1690 sba_common_init(struct sba_device *sba_dev)
1694 /* add this one to the head of the list (order doesn't matter)
1695 ** This will be useful for debugging - especially if we get coredumps
1697 sba_dev->next = sba_list;
1700 for(i=0; i< sba_dev->num_ioc; i++) {
1702 #ifdef DEBUG_DMB_TRAP
1703 extern void iterate_pages(unsigned long , unsigned long ,
1704 void (*)(pte_t * , unsigned long),
1706 void set_data_memory_break(pte_t * , unsigned long);
1708 /* resource map size dictated by pdir_size */
1709 res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */
1711 /* Second part of PIRANHA BUG */
1712 if (piranha_bad_128k) {
1713 res_size -= (128*1024)/sizeof(u64);
1716 res_size >>= 3; /* convert bit count to byte count */
1717 DBG_INIT("%s() res_size 0x%x\n",
1718 __func__, res_size);
1720 sba_dev->ioc[i].res_size = res_size;
1721 sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size));
1723 #ifdef DEBUG_DMB_TRAP
1724 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1725 set_data_memory_break, 0);
1728 if (NULL == sba_dev->ioc[i].res_map)
1730 panic("%s:%s() could not allocate resource map\n",
1731 __FILE__, __func__ );
1734 memset(sba_dev->ioc[i].res_map, 0, res_size);
1735 /* next available IOVP - circular search */
1736 sba_dev->ioc[i].res_hint = (unsigned long *)
1737 &(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]);
1739 #ifdef ASSERT_PDIR_SANITY
1740 /* Mark first bit busy - ie no IOVA 0 */
1741 sba_dev->ioc[i].res_map[0] = 0x80;
1742 sba_dev->ioc[i].pdir_base[0] = 0xeeffc0addbba0080ULL;
1745 /* Third (and last) part of PIRANHA BUG */
1746 if (piranha_bad_128k) {
1747 /* region from +1408K to +1536 is un-usable. */
1749 int idx_start = (1408*1024/sizeof(u64)) >> 3;
1750 int idx_end = (1536*1024/sizeof(u64)) >> 3;
1751 long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]);
1752 long *p_end = (long *) &(sba_dev->ioc[i].res_map[idx_end]);
1754 /* mark that part of the io pdir busy */
1755 while (p_start < p_end)
1760 #ifdef DEBUG_DMB_TRAP
1761 iterate_pages( sba_dev->ioc[i].res_map, res_size,
1762 set_data_memory_break, 0);
1763 iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size,
1764 set_data_memory_break, 0);
1767 DBG_INIT("%s() %d res_map %x %p\n",
1768 __func__, i, res_size, sba_dev->ioc[i].res_map);
1771 spin_lock_init(&sba_dev->sba_lock);
1772 ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC;
1774 #ifdef DEBUG_SBA_INIT
1776 * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
1777 * (bit #61, big endian), we have to flush and sync every time
1778 * IO-PDIR is changed in Ike/Astro.
1780 if (ioc_needs_fdc) {
1781 printk(KERN_INFO MODULE_NAME " FDC/SYNC required.\n");
1783 printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.\n");
1788 #ifdef CONFIG_PROC_FS
1789 static int sba_proc_info(struct seq_file *m, void *p)
1791 struct sba_device *sba_dev = sba_list;
1792 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1793 int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */
1794 #ifdef SBA_COLLECT_STATS
1795 unsigned long avg = 0, min, max;
1799 seq_printf(m, "%s rev %d.%d\n",
1801 (sba_dev->hw_rev & 0x7) + 1,
1802 (sba_dev->hw_rev & 0x18) >> 3);
1803 seq_printf(m, "IO PDIR size : %d bytes (%d entries)\n",
1804 (int)((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
1807 seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
1808 ioc->res_size, ioc->res_size << 3); /* 8 bits per byte */
1810 seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n",
1811 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
1812 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
1813 READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE));
1816 seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n",
1818 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE + i*0x18),
1819 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK + i*0x18),
1820 READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18));
1822 #ifdef SBA_COLLECT_STATS
1823 seq_printf(m, "IO PDIR entries : %ld free %ld used (%d%%)\n",
1824 total_pages - ioc->used_pages, ioc->used_pages,
1825 (int)(ioc->used_pages * 100 / total_pages));
1827 min = max = ioc->avg_search[0];
1828 for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
1829 avg += ioc->avg_search[i];
1830 if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
1831 if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
1833 avg /= SBA_SEARCH_SAMPLE;
1834 seq_printf(m, " Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
1837 seq_printf(m, "pci_map_single(): %12ld calls %12ld pages (avg %d/1000)\n",
1838 ioc->msingle_calls, ioc->msingle_pages,
1839 (int)((ioc->msingle_pages * 1000)/ioc->msingle_calls));
1841 /* KLUGE - unmap_sg calls unmap_single for each mapped page */
1842 min = ioc->usingle_calls;
1843 max = ioc->usingle_pages - ioc->usg_pages;
1844 seq_printf(m, "pci_unmap_single: %12ld calls %12ld pages (avg %d/1000)\n",
1845 min, max, (int)((max * 1000)/min));
1847 seq_printf(m, "pci_map_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1848 ioc->msg_calls, ioc->msg_pages,
1849 (int)((ioc->msg_pages * 1000)/ioc->msg_calls));
1851 seq_printf(m, "pci_unmap_sg() : %12ld calls %12ld pages (avg %d/1000)\n",
1852 ioc->usg_calls, ioc->usg_pages,
1853 (int)((ioc->usg_pages * 1000)/ioc->usg_calls));
1860 sba_proc_bitmap_info(struct seq_file *m, void *p)
1862 struct sba_device *sba_dev = sba_list;
1863 struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
1865 seq_hex_dump(m, " ", DUMP_PREFIX_NONE, 32, 4, ioc->res_map,
1866 ioc->res_size, false);
1871 #endif /* CONFIG_PROC_FS */
1873 static const struct parisc_device_id sba_tbl[] __initconst = {
1874 { HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb },
1875 { HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc },
1876 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc },
1877 { HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc },
1878 { HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc },
1882 static int sba_driver_callback(struct parisc_device *);
1884 static struct parisc_driver sba_driver __refdata = {
1885 .name = MODULE_NAME,
1886 .id_table = sba_tbl,
1887 .probe = sba_driver_callback,
1891 ** Determine if sba should claim this chip (return 0) or not (return 1).
1892 ** If so, initialize the chip and tell other partners in crime they
1895 static int __init sba_driver_callback(struct parisc_device *dev)
1897 struct sba_device *sba_dev;
1901 void __iomem *sba_addr = ioremap(dev->hpa.start, SBA_FUNC_SIZE);
1902 #ifdef CONFIG_PROC_FS
1903 struct proc_dir_entry *root;
1906 sba_dump_ranges(sba_addr);
1908 /* Read HW Rev First */
1909 func_class = READ_REG(sba_addr + SBA_FCLASS);
1911 if (IS_ASTRO(dev)) {
1912 unsigned long fclass;
1913 static char astro_rev[]="Astro ?.?";
1915 /* Astro is broken...Read HW Rev First */
1916 fclass = READ_REG(sba_addr);
1918 astro_rev[6] = '1' + (char) (fclass & 0x7);
1919 astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3);
1920 version = astro_rev;
1922 } else if (IS_IKE(dev)) {
1923 static char ike_rev[] = "Ike rev ?";
1924 ike_rev[8] = '0' + (char) (func_class & 0xff);
1926 } else if (IS_PLUTO(dev)) {
1927 static char pluto_rev[]="Pluto ?.?";
1928 pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4);
1929 pluto_rev[8] = '0' + (char) (func_class & 0x0f);
1930 version = pluto_rev;
1932 static char reo_rev[] = "REO rev ?";
1933 reo_rev[8] = '0' + (char) (func_class & 0xff);
1937 if (!global_ioc_cnt) {
1938 global_ioc_cnt = count_parisc_driver(&sba_driver);
1940 /* Astro and Pluto have one IOC per SBA */
1941 if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev)))
1942 global_ioc_cnt *= 2;
1945 printk(KERN_INFO "%s found %s at 0x%llx\n",
1946 MODULE_NAME, version, (unsigned long long)dev->hpa.start);
1948 sba_dev = kzalloc(sizeof(struct sba_device), GFP_KERNEL);
1950 printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device\n");
1954 parisc_set_drvdata(dev, sba_dev);
1956 for(i=0; i<MAX_IOC; i++)
1957 spin_lock_init(&(sba_dev->ioc[i].res_lock));
1960 sba_dev->hw_rev = func_class;
1961 sba_dev->name = dev->name;
1962 sba_dev->sba_hpa = sba_addr;
1964 sba_get_pat_resources(sba_dev);
1965 sba_hw_init(sba_dev);
1966 sba_common_init(sba_dev);
1968 hppa_dma_ops = &sba_ops;
1970 #ifdef CONFIG_PROC_FS
1971 switch (dev->id.hversion) {
1972 case PLUTO_MCKINLEY_PORT:
1973 if (!proc_mckinley_root)
1974 proc_mckinley_root = proc_mkdir("bus/mckinley", NULL);
1975 root = proc_mckinley_root;
1977 case ASTRO_RUNWAY_PORT:
1978 case IKE_MERCED_PORT:
1980 if (!proc_runway_root)
1981 proc_runway_root = proc_mkdir("bus/runway", NULL);
1982 root = proc_runway_root;
1986 proc_create_single("sba_iommu", 0, root, sba_proc_info);
1987 proc_create_single("sba_iommu-bitmap", 0, root, sba_proc_bitmap_info);
1993 ** One time initialization to let the world know the SBA was found.
1994 ** This is the only routine which is NOT static.
1995 ** Must be called exactly once before pci_init().
1997 void __init sba_init(void)
1999 register_parisc_driver(&sba_driver);
2004 * sba_get_iommu - Assign the iommu pointer for the pci bus controller.
2005 * @pci_hba: The parisc device.
2007 * Returns the appropriate IOMMU data for the given parisc PCI controller.
2008 * This is cached and used later for PCI DMA Mapping.
2010 void * sba_get_iommu(struct parisc_device *pci_hba)
2012 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2013 struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2014 char t = sba_dev->id.hw_type;
2015 int iocnum = (pci_hba->hw_path >> 3); /* rope # */
2017 WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT));
2019 return &(sba->ioc[iocnum]);
2024 * sba_directed_lmmio - return first directed LMMIO range routed to rope
2025 * @pci_hba: The parisc device.
2026 * @r: resource PCI host controller wants start/end fields assigned.
2028 * For the given parisc PCI controller, determine if any direct ranges
2029 * are routed down the corresponding rope.
2031 void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
2033 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2034 struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2035 char t = sba_dev->id.hw_type;
2037 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2039 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2041 r->start = r->end = 0;
2043 /* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
2044 for (i=0; i<4; i++) {
2046 void __iomem *reg = sba->sba_hpa + i*0x18;
2048 base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
2049 if ((base & 1) == 0)
2050 continue; /* not enabled */
2052 size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);
2054 if ((size & (ROPES_PER_IOC-1)) != rope)
2055 continue; /* directed down different rope */
2057 r->start = (base & ~1UL) | PCI_F_EXTEND;
2058 size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
2059 r->end = r->start + size;
2060 r->flags = IORESOURCE_MEM;
2066 * sba_distributed_lmmio - return portion of distributed LMMIO range
2067 * @pci_hba: The parisc device.
2068 * @r: resource PCI host controller wants start/end fields assigned.
2070 * For the given parisc PCI controller, return portion of distributed LMMIO
2071 * range. The distributed LMMIO is always present and it's just a question
2072 * of the base address and size of the range.
2074 void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
2076 struct parisc_device *sba_dev = parisc_parent(pci_hba);
2077 struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
2078 char t = sba_dev->id.hw_type;
2080 int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1)); /* rope # */
2082 BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
2084 r->start = r->end = 0;
2086 base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
2087 if ((base & 1) == 0) {
2088 BUG(); /* Gah! Distr Range wasn't enabled! */
2092 r->start = (base & ~1UL) | PCI_F_EXTEND;
2094 size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
2095 r->start += rope * (size + 1); /* adjust base for this rope */
2096 r->end = r->start + size;
2097 r->flags = IORESOURCE_MEM;