sba_iommu.c
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上传日期:2013-04-10
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- /*
- ** System Bus Adapter (SBA) I/O MMU manager
- **
- ** (c) Copyright 2000 Grant Grundler
- ** (c) Copyright 2000 Hewlett-Packard Company
- **
- ** Portions (c) 1999 Dave S. Miller (from sparc64 I/O MMU code)
- **
- ** This program is free software; you can redistribute it and/or modify
- ** it under the terms of the GNU General Public License as published by
- ** the Free Software Foundation; either version 2 of the License, or
- ** (at your option) any later version.
- **
- **
- ** This module initializes the IOC (I/O Controller) found on B1000/C3000/
- ** J5000/J7000/N-class/L-class machines and their successors.
- **
- ** FIXME: add DMA hint support programming in both sba and lba modules.
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/spinlock.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/mm.h>
- #include <linux/string.h>
- #undef PCI_DEBUG /* for ASSERT */
- #include <linux/pci.h>
- #undef PCI_DEBUG
- #include <asm/byteorder.h>
- #include <asm/io.h>
- #include <asm/dma.h> /* for DMA_CHUNK_SIZE */
- #include <asm/hardware.h> /* for register_parisc_driver() stuff */
- #include <asm/gsc.h> /* FIXME: for gsc_read/gsc_write */
- #include <linux/proc_fs.h>
- #include <asm/runway.h> /* for proc_runway_root */
- #include <asm/pdc.h> /* for PDC_MODEL_* */
- #define MODULE_NAME "SBA"
- /*
- ** The number of debug flags is a clue - this code is fragile.
- ** Don't even think about messing with it unless you have
- ** plenty of 710's to sacrifice to the computer gods. :^)
- */
- #undef DEBUG_SBA_INIT
- #undef DEBUG_SBA_RUN
- #undef DEBUG_SBA_RUN_SG
- #undef DEBUG_SBA_RESOURCE
- #undef ASSERT_PDIR_SANITY
- #undef DEBUG_LARGE_SG_ENTRIES
- #undef DEBUG_DMB_TRAP
- #define SBA_INLINE __inline__
- #ifdef DEBUG_SBA_INIT
- #define DBG_INIT(x...) printk(x)
- #else
- #define DBG_INIT(x...)
- #endif
- #ifdef DEBUG_SBA_RUN
- #define DBG_RUN(x...) printk(x)
- #else
- #define DBG_RUN(x...)
- #endif
- #ifdef DEBUG_SBA_RUN_SG
- #define DBG_RUN_SG(x...) printk(x)
- #else
- #define DBG_RUN_SG(x...)
- #endif
- #ifdef DEBUG_SBA_RESOURCE
- #define DBG_RES(x...) printk(x)
- #else
- #define DBG_RES(x...)
- #endif
- /*
- ** The number of pdir entries to "free" before issueing
- ** a read to PCOM register to flush out PCOM writes.
- ** Interacts with allocation granularity (ie 4 or 8 entries
- ** allocated and free'd/purged at a time might make this
- ** less interesting).
- */
- #define DELAYED_RESOURCE_CNT 16
- #define DEFAULT_DMA_HINT_REG 0
- #define ASTRO_RUNWAY_PORT 0x582
- #define ASTRO_ROPES_PORT 0x780
- #define IKE_MERCED_PORT 0x803
- #define IKE_ROPES_PORT 0x781
- #define REO_MERCED_PORT 0x804
- #define REO_ROPES_PORT 0x782
- #define REOG_MERCED_PORT 0x805
- #define REOG_ROPES_PORT 0x783
- #define SBA_FUNC_ID 0x0000 /* function id */
- #define SBA_FCLASS 0x0008 /* function class, bist, header, rev... */
- #define IS_ASTRO(id)
- (((id)->hversion == ASTRO_RUNWAY_PORT) || ((id)->hversion == ASTRO_ROPES_PORT))
- #define IS_IKE(id)
- (((id)->hversion == IKE_MERCED_PORT) || ((id)->hversion == IKE_ROPES_PORT))
- #define SBA_FUNC_SIZE 4096 /* SBA configuration function reg set */
- #define ASTRO_IOC_OFFSET 0x20000
- /* Ike's IOC's occupy functions 2 and 3 (not 0 and 1) */
- #define IKE_IOC_OFFSET(p) ((p+2)*SBA_FUNC_SIZE)
- #define IOC_CTRL 0x8 /* IOC_CTRL offset */
- #define IOC_CTRL_TC (1 << 0) /* TOC Enable */
- #define IOC_CTRL_CE (1 << 1) /* Coalesce Enable */
- #define IOC_CTRL_DE (1 << 2) /* Dillon Enable */
- #define IOC_CTRL_RM (1 << 8) /* Real Mode */
- #define IOC_CTRL_NC (1 << 9) /* Non Coherent Mode */
- #define MAX_IOC 2 /* per Ike. Astro only has 1 */
- /*
- ** Offsets into MBIB (Function 0 on Ike and hopefully Astro)
- ** Firmware programs this stuff. Don't touch it.
- */
- #define IOS_DIST_BASE 0x390
- #define IOS_DIST_MASK 0x398
- #define IOS_DIST_ROUTE 0x3A0
- #define IOS_DIRECT_BASE 0x3C0
- #define IOS_DIRECT_MASK 0x3C8
- #define IOS_DIRECT_ROUTE 0x3D0
- /*
- ** Offsets into I/O TLB (Function 2 and 3 on Ike)
- */
- #define ROPE0_CTL 0x200 /* "regbus pci0" */
- #define ROPE1_CTL 0x208
- #define ROPE2_CTL 0x210
- #define ROPE3_CTL 0x218
- #define ROPE4_CTL 0x220
- #define ROPE5_CTL 0x228
- #define ROPE6_CTL 0x230
- #define ROPE7_CTL 0x238
- #define HF_ENABLE 0x40
- #define IOC_IBASE 0x300 /* IO TLB */
- #define IOC_IMASK 0x308
- #define IOC_PCOM 0x310
- #define IOC_TCNFG 0x318
- #define IOC_PDIR_BASE 0x320
- #define IOC_IOVA_SPACE_BASE 0 /* IOVA ranges start at 0 */
- /*
- ** IOC supports 4/8/16/64KB page sizes (see TCNFG register)
- ** It's safer (avoid memory corruption) to keep DMA page mappings
- ** equivalently sized to VM PAGE_SIZE.
- **
- ** We really can't avoid generating a new mapping for each
- ** page since the Virtual Coherence Index has to be generated
- ** and updated for each page.
- **
- ** IOVP_SIZE could only be greater than PAGE_SIZE if we are
- ** confident the drivers really only touch the next physical
- ** page iff that driver instance owns it.
- */
- #define IOVP_SIZE PAGE_SIZE
- #define IOVP_SHIFT PAGE_SHIFT
- #define IOVP_MASK PAGE_MASK
- #define SBA_PERF_CFG 0x708 /* Performance Counter stuff */
- #define SBA_PERF_MASK1 0x718
- #define SBA_PERF_MASK2 0x730
- /*
- ** Offsets into PCI Performance Counters (functions 12 and 13)
- ** Controlled by PERF registers in function 2 & 3 respectively.
- */
- #define SBA_PERF_CNT1 0x200
- #define SBA_PERF_CNT2 0x208
- #define SBA_PERF_CNT3 0x210
- struct ioc {
- unsigned long ioc_hpa; /* I/O MMU base address */
- char *res_map; /* resource map, bit == pdir entry */
- u64 *pdir_base; /* physical base address */
- unsigned long *res_hint; /* next avail IOVP - circular search */
- spinlock_t res_lock;
- unsigned long hint_mask_pdir; /* bits used for DMA hints */
- unsigned int res_bitshift; /* from the LEFT! */
- unsigned int res_size; /* size of resource map in bytes */
- unsigned int hint_shift_pdir;
- #if DELAYED_RESOURCE_CNT > 0
- int saved_cnt;
- struct sba_dma_pair {
- dma_addr_t iova;
- size_t size;
- } saved[DELAYED_RESOURCE_CNT];
- #endif
- #ifdef CONFIG_PROC_FS
- #define SBA_SEARCH_SAMPLE 0x100
- unsigned long avg_search[SBA_SEARCH_SAMPLE];
- unsigned long avg_idx; /* current index into avg_search */
- unsigned long used_pages;
- unsigned long msingle_calls;
- unsigned long msingle_pages;
- unsigned long msg_calls;
- unsigned long msg_pages;
- unsigned long usingle_calls;
- unsigned long usingle_pages;
- unsigned long usg_calls;
- unsigned long usg_pages;
- #endif
- /* STUFF We don't need in performance path */
- unsigned int pdir_size; /* in bytes, determined by IOV Space size */
- unsigned long ibase; /* pdir IOV Space base - shared w/lba_pci */
- unsigned long imask; /* pdir IOV Space mask - shared w/lba_pci */
- };
- struct sba_device {
- struct sba_device *next; /* list of SBA's in system */
- struct parisc_device *dev; /* dev found in bus walk */
- struct parisc_device_id *iodc; /* data about dev from firmware */
- const char *name;
- unsigned long sba_hpa; /* base address */
- spinlock_t sba_lock;
- unsigned int flags; /* state/functionality enabled */
- unsigned int hw_rev; /* HW revision of chip */
- unsigned int num_ioc; /* number of on-board IOC's */
- struct ioc ioc[MAX_IOC];
- };
- static struct sba_device *sba_list;
- static unsigned long ioc_needs_fdc = 0;
- /* Ratio of Host MEM to IOV Space size */
- static unsigned long sba_mem_ratio = 8;
- /* global count of IOMMUs in the system */
- static unsigned int global_ioc_cnt = 0;
- /* PA8700 (Piranha 2.2) bug workaround */
- static unsigned long piranha_bad_128k = 0;
- /* Looks nice and keeps the compiler happy */
- #define SBA_DEV(d) ((struct sba_device *) (d))
- #define ROUNDUP(x,y) ((x + ((y)-1)) & ~((y)-1))
- /************************************
- ** SBA register read and write support
- **
- ** BE WARNED: register writes are posted.
- ** (ie follow writes which must reach HW with a read)
- **
- ** Superdome (in particular, REO) allows only 64-bit CSR accesses.
- */
- #define READ_REG32(addr) le32_to_cpu(__raw_readl(addr))
- #define READ_REG64(addr) le64_to_cpu(__raw_readq(addr))
- #define WRITE_REG32(val, addr) __raw_writel(cpu_to_le32(val), addr)
- #define WRITE_REG64(val, addr) __raw_writeq(cpu_to_le64(val), addr)
- #ifdef __LP64__
- #define READ_REG(addr) READ_REG64(addr)
- #define WRITE_REG(value, addr) WRITE_REG64(value, addr)
- #else
- #define READ_REG(addr) READ_REG32(addr)
- #define WRITE_REG(value, addr) WRITE_REG32(value, addr)
- #endif
- #ifdef DEBUG_SBA_INIT
- /* NOTE: When __LP64__ isn't defined, READ_REG64() is two 32-bit reads */
- /**
- * sba_dump_ranges - debugging only - print ranges assigned to this IOA
- * @hpa: base address of the sba
- *
- * Print the MMIO and IO Port address ranges forwarded by an Astro/Ike/RIO
- * IO Adapter (aka Bus Converter).
- */
- static void
- sba_dump_ranges(unsigned long hpa)
- {
- DBG_INIT("SBA at 0x%lxn", hpa);
- DBG_INIT("IOS_DIST_BASE : %Lxn", READ_REG64(hpa+IOS_DIST_BASE));
- DBG_INIT("IOS_DIST_MASK : %Lxn", READ_REG64(hpa+IOS_DIST_MASK));
- DBG_INIT("IOS_DIST_ROUTE : %Lxn", READ_REG64(hpa+IOS_DIST_ROUTE));
- DBG_INIT("n");
- DBG_INIT("IOS_DIRECT_BASE : %Lxn", READ_REG64(hpa+IOS_DIRECT_BASE));
- DBG_INIT("IOS_DIRECT_MASK : %Lxn", READ_REG64(hpa+IOS_DIRECT_MASK));
- DBG_INIT("IOS_DIRECT_ROUTE: %Lxn", READ_REG64(hpa+IOS_DIRECT_ROUTE));
- }
- /**
- * sba_dump_tlb - debugging only - print IOMMU operating parameters
- * @hpa: base address of the IOMMU
- *
- * Print the size/location of the IO MMU PDIR.
- */
- static void
- sba_dump_tlb(unsigned long hpa)
- {
- DBG_INIT("IO TLB at 0x%lxn", hpa);
- DBG_INIT("IOC_IBASE : %Lxn", READ_REG64(hpa+IOC_IBASE));
- DBG_INIT("IOC_IMASK : %Lxn", READ_REG64(hpa+IOC_IMASK));
- DBG_INIT("IOC_TCNFG : %Lxn", READ_REG64(hpa+IOC_TCNFG));
- DBG_INIT("IOC_PDIR_BASE: %Lxn", READ_REG64(hpa+IOC_PDIR_BASE));
- DBG_INIT("n");
- }
- #endif
- #ifdef ASSERT_PDIR_SANITY
- /**
- * sba_dump_pdir_entry - debugging only - print one IOMMU PDIR entry
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @msg: text to print ont the output line.
- * @pide: pdir index.
- *
- * Print one entry of the IO MMU PDIR in human readable form.
- */
- static void
- sba_dump_pdir_entry(struct ioc *ioc, char *msg, uint pide)
- {
- /* start printing from lowest pde in rval */
- u64 *ptr = &(ioc->pdir_base[pide & (~0U * BITS_PER_LONG)]);
- unsigned long *rptr = (unsigned long *) &(ioc->res_map[(pide >>3) & ~(sizeof(unsigned long) - 1)]);
- uint rcnt;
- printk(KERN_DEBUG "SBA: %s rp %p bit %d rval 0x%lxn",
- msg,
- rptr, pide & (BITS_PER_LONG - 1), *rptr);
- rcnt = 0;
- while (rcnt < BITS_PER_LONG) {
- printk(KERN_DEBUG "%s %2d %p %016Lxn",
- (rcnt == (pide & (BITS_PER_LONG - 1)))
- ? " -->" : " ",
- rcnt, ptr, *ptr );
- rcnt++;
- ptr++;
- }
- printk(KERN_DEBUG "%s", msg);
- }
- /**
- * sba_check_pdir - debugging only - consistency checker
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @msg: text to print ont the output line.
- *
- * Verify the resource map and pdir state is consistent
- */
- static int
- sba_check_pdir(struct ioc *ioc, char *msg)
- {
- u32 *rptr_end = (u32 *) &(ioc->res_map[ioc->res_size]);
- u32 *rptr = (u32 *) ioc->res_map; /* resource map ptr */
- u64 *pptr = ioc->pdir_base; /* pdir ptr */
- uint pide = 0;
- while (rptr < rptr_end) {
- u32 rval = *rptr;
- int rcnt = 32; /* number of bits we might check */
- while (rcnt) {
- /* Get last byte and highest bit from that */
- u32 pde = ((u32) (((char *)pptr)[7])) << 24;
- if ((rval ^ pde) & 0x80000000)
- {
- /*
- ** BUMMER! -- res_map != pdir --
- ** Dump rval and matching pdir entries
- */
- sba_dump_pdir_entry(ioc, msg, pide);
- return(1);
- }
- rcnt--;
- rval <<= 1; /* try the next bit */
- pptr++;
- pide++;
- }
- rptr++; /* look at next word of res_map */
- }
- /* It'd be nice if we always got here :^) */
- return 0;
- }
- /**
- * sba_dump_sg - debugging only - print Scatter-Gather list
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @startsg: head of the SG list
- * @nents: number of entries in SG list
- *
- * print the SG list so we can verify it's correct by hand.
- */
- static void
- sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
- {
- while (nents-- > 0) {
- printk(KERN_DEBUG " %d : %08lx/%05x %p/%05xn",
- nents,
- (unsigned long) sg_dma_address(startsg),
- sg_dma_len(startsg),
- sg_virt_addr(startsg), startsg->length);
- startsg++;
- }
- }
- #endif /* ASSERT_PDIR_SANITY */
- /**************************************************************
- *
- * I/O Pdir Resource Management
- *
- * Bits set in the resource map are in use.
- * Each bit can represent a number of pages.
- * LSbs represent lower addresses (IOVA's).
- *
- ***************************************************************/
- #define PAGES_PER_RANGE 1 /* could increase this to 4 or 8 if needed */
- /* Convert from IOVP to IOVA and vice versa. */
- #define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset) | ((hint_reg)<<(ioc->hint_shift_pdir)))
- #define SBA_IOVP(ioc,iova) ((iova) & ioc->hint_mask_pdir)
- /* FIXME : review these macros to verify correctness and usage */
- #define PDIR_INDEX(iovp) ((iovp)>>IOVP_SHIFT)
- #define MKIOVP(dma_hint,pide) (dma_addr_t)((long)(dma_hint) | ((long)(pide) << IOVP_SHIFT))
- #define MKIOVA(iovp,offset) (dma_addr_t)((long)iovp | (long)offset)
- #define RESMAP_MASK(n) (~0UL << (BITS_PER_LONG - (n)))
- #define RESMAP_IDX_MASK (sizeof(unsigned long) - 1)
- /**
- * sba_search_bitmap - find free space in IO PDIR resource bitmap
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @bits_wanted: number of entries we need.
- *
- * Find consecutive free bits in resource bitmap.
- * Each bit represents one entry in the IO Pdir.
- * Cool perf optimization: search for log2(size) bits at a time.
- */
- static SBA_INLINE unsigned long
- sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted)
- {
- unsigned long *res_ptr = ioc->res_hint;
- unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
- unsigned long pide = ~0UL;
- ASSERT(((unsigned long) ioc->res_hint & (sizeof(unsigned long) - 1UL)) == 0);
- ASSERT(res_ptr < res_end);
- if (bits_wanted > (BITS_PER_LONG/2)) {
- /* Search word at a time - no mask needed */
- for(; res_ptr < res_end; ++res_ptr) {
- if (*res_ptr == 0) {
- *res_ptr = RESMAP_MASK(bits_wanted);
- pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map);
- pide <<= 3; /* convert to bit address */
- break;
- }
- }
- /* point to the next word on next pass */
- res_ptr++;
- ioc->res_bitshift = 0;
- } else {
- /*
- ** Search the resource bit map on well-aligned values.
- ** "o" is the alignment.
- ** We need the alignment to invalidate I/O TLB using
- ** SBA HW features in the unmap path.
- */
- unsigned long o = 1 << get_order(bits_wanted << PAGE_SHIFT);
- uint bitshiftcnt = ROUNDUP(ioc->res_bitshift, o);
- unsigned long mask;
- if (bitshiftcnt >= BITS_PER_LONG) {
- bitshiftcnt = 0;
- res_ptr++;
- }
- mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;
- DBG_RES("%s() o %ld %p", __FUNCTION__, o, res_ptr);
- while(res_ptr < res_end)
- {
- DBG_RES(" %p %lx %lxn", res_ptr, mask, *res_ptr);
- ASSERT(0 != mask);
- if(0 == ((*res_ptr) & mask)) {
- *res_ptr |= mask; /* mark resources busy! */
- pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map);
- pide <<= 3; /* convert to bit address */
- pide += bitshiftcnt;
- break;
- }
- mask >>= o;
- bitshiftcnt += o;
- if (0 == mask) {
- mask = RESMAP_MASK(bits_wanted);
- bitshiftcnt=0;
- res_ptr++;
- }
- }
- /* look in the same word on the next pass */
- ioc->res_bitshift = bitshiftcnt + bits_wanted;
- }
- /* wrapped ? */
- if (res_end <= res_ptr) {
- ioc->res_hint = (unsigned long *) ioc->res_map;
- ioc->res_bitshift = 0;
- } else {
- ioc->res_hint = res_ptr;
- }
- return (pide);
- }
- /**
- * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @size: number of bytes to create a mapping for
- *
- * Given a size, find consecutive unmarked and then mark those bits in the
- * resource bit map.
- */
- static int
- sba_alloc_range(struct ioc *ioc, size_t size)
- {
- unsigned int pages_needed = size >> IOVP_SHIFT;
- #ifdef CONFIG_PROC_FS
- unsigned long cr_start = mfctl(16);
- #endif
- unsigned long pide;
- ASSERT(pages_needed);
- ASSERT((pages_needed * IOVP_SIZE) <= DMA_CHUNK_SIZE);
- ASSERT(pages_needed <= BITS_PER_LONG);
- ASSERT(0 == (size & ~IOVP_MASK));
- /*
- ** "seek and ye shall find"...praying never hurts either...
- ** ggg sacrifices another 710 to the computer gods.
- */
- pide = sba_search_bitmap(ioc, pages_needed);
- if (pide >= (ioc->res_size << 3)) {
- pide = sba_search_bitmap(ioc, pages_needed);
- if (pide >= (ioc->res_size << 3))
- panic(__FILE__ ": I/O MMU @ %lx is out of mapping resourcesn", ioc->ioc_hpa);
- }
- #ifdef ASSERT_PDIR_SANITY
- /* verify the first enable bit is clear */
- if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 7]) {
- sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
- }
- #endif
- DBG_RES("%s(%x) %d -> %lx hint %x/%xn",
- __FUNCTION__, size, pages_needed, pide,
- (uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
- ioc->res_bitshift );
- #ifdef CONFIG_PROC_FS
- {
- unsigned long cr_end = mfctl(16);
- unsigned long tmp = cr_end - cr_start;
- /* check for roll over */
- cr_start = (cr_end < cr_start) ? -(tmp) : (tmp);
- }
- ioc->avg_search[ioc->avg_idx++] = cr_start;
- ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
- ioc->used_pages += pages_needed;
- #endif
- return (pide);
- }
- /**
- * sba_free_range - unmark bits in IO PDIR resource bitmap
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @iova: IO virtual address which was previously allocated.
- * @size: number of bytes to create a mapping for
- *
- * clear bits in the ioc's resource map
- */
- static SBA_INLINE void
- sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
- {
- unsigned long iovp = SBA_IOVP(ioc, iova);
- unsigned int pide = PDIR_INDEX(iovp);
- unsigned int ridx = pide >> 3; /* convert bit to byte address */
- unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
- int bits_not_wanted = size >> IOVP_SHIFT;
- /* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
- unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
- DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lxn",
- __FUNCTION__, (uint) iova, size,
- bits_not_wanted, m, pide, res_ptr, *res_ptr);
- #ifdef CONFIG_PROC_FS
- ioc->used_pages -= bits_not_wanted;
- #endif
- ASSERT(m != 0);
- ASSERT(bits_not_wanted);
- ASSERT((bits_not_wanted * IOVP_SIZE) <= DMA_CHUNK_SIZE);
- ASSERT(bits_not_wanted <= BITS_PER_LONG);
- ASSERT((*res_ptr & m) == m); /* verify same bits are set */
- *res_ptr &= ~m;
- }
- /**************************************************************
- *
- * "Dynamic DMA Mapping" support (aka "Coherent I/O")
- *
- ***************************************************************/
- #define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
- typedef unsigned long space_t;
- #define KERNEL_SPACE 0
- /**
- * sba_io_pdir_entry - fill in one IO PDIR entry
- * @pdir_ptr: pointer to IO PDIR entry
- * @sid: process Space ID
- * @vba: Virtual CPU address of buffer to map
- *
- * SBA Mapping Routine
- *
- * Given a virtual address (vba, arg2) and space id, (sid, arg1)
- * sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
- * pdir_ptr (arg0). Each IO Pdir entry consists of 8 bytes as
- * shown below (MSB == bit 0):
- *
- * 0 19 51 55 63
- * +-+---------------------+----------------------------------+----+--------+
- * |V| U | PPN[43:12] | U | VI |
- * +-+---------------------+----------------------------------+----+--------+
- *
- * V == Valid Bit
- * U == Unused
- * PPN == Physical Page Number
- * VI == Virtual Index (aka Coherent Index)
- *
- * The physical address fields are filled with the results of the LPA
- * instruction. The virtual index field is filled with the results of
- * of the LCI (Load Coherence Index) instruction. The 8 bits used for
- * the virtual index are bits 12:19 of the value returned by LCI.
- *
- * We need to pre-swap the bytes since PCX-W is Big Endian.
- */
- void SBA_INLINE
- sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba)
- {
- u64 pa; /* physical address */
- register unsigned ci; /* coherent index */
- /* We currently only support kernel addresses.
- * fdc instr below will need to reload sr1 with KERNEL_SPACE
- * once we try to support direct DMA to user space.
- */
- ASSERT(sid == KERNEL_SPACE);
- pa = virt_to_phys(vba);
- pa &= ~4095ULL; /* clear out offset bits */
- mtsp(sid,1);
- asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
- pa |= (ci >> 12) & 0xff; /* move CI (8 bits) into lowest byte */
- pa |= 0x8000000000000000ULL; /* set "valid" bit */
- *pdir_ptr = cpu_to_le64(pa); /* swap and store into I/O Pdir */
- /*
- * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
- * (bit #61, big endian), we have to flush and sync every time
- * IO-PDIR is changed in Ike/Astro.
- */
- if (ioc_needs_fdc) {
- asm volatile("fdc 0(%%sr1,%0)ntsync" : : "r" (pdir_ptr));
- }
- }
- /**
- * sba_mark_invalid - invalidate one or more IO PDIR entries
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @iova: IO Virtual Address mapped earlier
- * @byte_cnt: number of bytes this mapping covers.
- *
- * Marking the IO PDIR entry(ies) as Invalid and invalidate
- * corresponding IO TLB entry. The Ike PCOM (Purge Command Register)
- * is to purge stale entries in the IO TLB when unmapping entries.
- *
- * The PCOM register supports purging of multiple pages, with a minium
- * of 1 page and a maximum of 2GB. Hardware requires the address be
- * aligned to the size of the range being purged. The size of the range
- * must be a power of 2. The "Cool perf optimization" in the
- * allocation routine helps keep that true.
- */
- static SBA_INLINE void
- sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
- {
- u32 iovp = (u32) SBA_IOVP(ioc,iova);
- /* Even though this is a big-endian machine, the entries
- ** in the iopdir are little endian. That's why we clear the byte
- ** at +7 instead of at +0.
- */
- int off = PDIR_INDEX(iovp)*sizeof(u64)+7;
- /* Must be non-zero and rounded up */
- ASSERT(byte_cnt > 0);
- ASSERT(0 == (byte_cnt & ~IOVP_MASK));
- #ifdef ASSERT_PDIR_SANITY
- /* Assert first pdir entry is set */
- if (0x80 != (((u8 *) ioc->pdir_base)[off])) {
- sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
- }
- #endif
- if (byte_cnt <= IOVP_SIZE)
- {
- ASSERT( off < ioc->pdir_size);
- iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
- /*
- ** clear I/O PDIR entry "valid" bit
- ** Do NOT clear the rest - save it for debugging.
- ** We should only clear bits that have previously
- ** been enabled.
- */
- ((u8 *)(ioc->pdir_base))[off] = 0;
- } else {
- u32 t = get_order(byte_cnt) + PAGE_SHIFT;
- iovp |= t;
- ASSERT(t <= 31); /* 2GB! Max value of "size" field */
- do {
- /* verify this pdir entry is enabled */
- ASSERT(0x80 == (((u8 *) ioc->pdir_base)[off] & 0x80));
- /* clear I/O Pdir entry "valid" bit first */
- ((u8 *)(ioc->pdir_base))[off] = 0;
- off += sizeof(u64);
- byte_cnt -= IOVP_SIZE;
- } while (byte_cnt > 0);
- }
- WRITE_REG(iovp, ioc->ioc_hpa+IOC_PCOM);
- }
- /**
- * sba_dma_supported - PCI driver can query DMA support
- * @dev: instance of PCI owned by the driver that's asking
- * @mask: number of address bits this PCI device can handle
- *
- * See Documentation/DMA-mapping.txt
- */
- static int
- sba_dma_supported( struct pci_dev *dev, u64 mask)
- {
- if (dev == NULL) {
- printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supportedn");
- BUG();
- return(0);
- }
- dev->dma_mask = mask; /* save it */
- /* only support 32-bit PCI devices - no DAC support (yet) */
- return((int) (mask == 0xffffffff));
- }
- /**
- * sba_map_single - map one buffer and return IOVA for DMA
- * @dev: instance of PCI owned by the driver that's asking.
- * @addr: driver buffer to map.
- * @size: number of bytes to map in driver buffer.
- * @direction: R/W or both.
- *
- * See Documentation/DMA-mapping.txt
- */
- static dma_addr_t
- sba_map_single(struct pci_dev *dev, void *addr, size_t size, int direction)
- {
- struct ioc *ioc;
- unsigned long flags;
- dma_addr_t iovp;
- dma_addr_t offset;
- u64 *pdir_start;
- int pide;
- ASSERT(size > 0);
- ASSERT(size <= DMA_CHUNK_SIZE);
- ASSERT(dev->sysdata);
- ioc = GET_IOC(dev);
- ASSERT(ioc);
- /* save offset bits */
- offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
- /* round up to nearest IOVP_SIZE */
- size = (size + offset + ~IOVP_MASK) & IOVP_MASK;
- spin_lock_irqsave(&ioc->res_lock, flags);
- #ifdef ASSERT_PDIR_SANITY
- sba_check_pdir(ioc,"Check before sba_map_single()");
- #endif
- #ifdef CONFIG_PROC_FS
- ioc->msingle_calls++;
- ioc->msingle_pages += size >> IOVP_SHIFT;
- #endif
- pide = sba_alloc_range(ioc, size);
- iovp = (dma_addr_t) pide << IOVP_SHIFT;
- DBG_RUN("%s() 0x%p -> 0x%lx",
- __FUNCTION__, addr, (long) iovp | offset);
- pdir_start = &(ioc->pdir_base[pide]);
- while (size > 0) {
- ASSERT(((u8 *)pdir_start)[7] == 0); /* verify availability */
- sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr);
- DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02xn",
- pdir_start,
- (u8) (((u8 *) pdir_start)[7]),
- (u8) (((u8 *) pdir_start)[6]),
- (u8) (((u8 *) pdir_start)[5]),
- (u8) (((u8 *) pdir_start)[4]),
- (u8) (((u8 *) pdir_start)[3]),
- (u8) (((u8 *) pdir_start)[2]),
- (u8) (((u8 *) pdir_start)[1]),
- (u8) (((u8 *) pdir_start)[0])
- );
- addr += IOVP_SIZE;
- size -= IOVP_SIZE;
- pdir_start++;
- }
- /* form complete address */
- #ifdef ASSERT_PDIR_SANITY
- sba_check_pdir(ioc,"Check after sba_map_single()");
- #endif
- spin_unlock_irqrestore(&ioc->res_lock, flags);
- return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
- }
- /**
- * sba_unmap_single - unmap one IOVA and free resources
- * @dev: instance of PCI owned by the driver that's asking.
- * @iova: IOVA of driver buffer previously mapped.
- * @size: number of bytes mapped in driver buffer.
- * @direction: R/W or both.
- *
- * See Documentation/DMA-mapping.txt
- */
- static void
- sba_unmap_single(struct pci_dev *dev, dma_addr_t iova, size_t size, int direction)
- {
- struct ioc *ioc;
- #if DELAYED_RESOURCE_CNT > 0
- struct sba_dma_pair *d;
- #endif
- unsigned long flags;
- dma_addr_t offset;
- ASSERT(dev->sysdata);
- ioc = GET_IOC(dev);
- ASSERT(ioc);
- offset = iova & ~IOVP_MASK;
- DBG_RUN("%s() iovp 0x%lx/%xn",
- __FUNCTION__, (long) iova, size);
- iova ^= offset; /* clear offset bits */
- size += offset;
- size = ROUNDUP(size, IOVP_SIZE);
- spin_lock_irqsave(&ioc->res_lock, flags);
- #ifdef CONFIG_PROC_FS
- ioc->usingle_calls++;
- ioc->usingle_pages += size >> IOVP_SHIFT;
- #endif
- #if DELAYED_RESOURCE_CNT > 0
- d = &(ioc->saved[ioc->saved_cnt]);
- d->iova = iova;
- d->size = size;
- if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
- int cnt = ioc->saved_cnt;
- while (cnt--) {
- sba_mark_invalid(ioc, d->iova, d->size);
- sba_free_range(ioc, d->iova, d->size);
- d--;
- }
- ioc->saved_cnt = 0;
- READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
- }
- #else /* DELAYED_RESOURCE_CNT == 0 */
- sba_mark_invalid(ioc, iova, size);
- sba_free_range(ioc, iova, size);
- READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
- #endif /* DELAYED_RESOURCE_CNT == 0 */
- spin_unlock_irqrestore(&ioc->res_lock, flags);
- /* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
- ** For Astro based systems this isn't a big deal WRT performance.
- ** As long as 2.4 kernels copyin/copyout data from/to userspace,
- ** we don't need the syncdma. The issue here is I/O MMU cachelines
- ** are *not* coherent in all cases. May be hwrev dependent.
- ** Need to investigate more.
- asm volatile("syncdma");
- */
- }
- /**
- * sba_alloc_consistent - allocate/map shared mem for DMA
- * @hwdev: instance of PCI owned by the driver that's asking.
- * @size: number of bytes mapped in driver buffer.
- * @dma_handle: IOVA of new buffer.
- *
- * See Documentation/DMA-mapping.txt
- */
- static void *
- sba_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle)
- {
- void *ret;
- if (!hwdev) {
- /* only support PCI */
- *dma_handle = 0;
- return 0;
- }
- ret = (void *) __get_free_pages(GFP_ATOMIC, get_order(size));
- if (ret) {
- memset(ret, 0, size);
- *dma_handle = sba_map_single(hwdev, ret, size, 0);
- }
- return ret;
- }
- /**
- * sba_free_consistent - free/unmap shared mem for DMA
- * @hwdev: instance of PCI owned by the driver that's asking.
- * @size: number of bytes mapped in driver buffer.
- * @vaddr: virtual address IOVA of "consistent" buffer.
- * @dma_handler: IO virtual address of "consistent" buffer.
- *
- * See Documentation/DMA-mapping.txt
- */
- static void
- sba_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
- {
- sba_unmap_single(hwdev, dma_handle, size, 0);
- free_pages((unsigned long) vaddr, get_order(size));
- }
- /*
- ** Since 0 is a valid pdir_base index value, can't use that
- ** to determine if a value is valid or not. Use a flag to indicate
- ** the SG list entry contains a valid pdir index.
- */
- #define PIDE_FLAG 0x80000000UL
- #ifdef DEBUG_LARGE_SG_ENTRIES
- int dump_run_sg = 0;
- #endif
- /**
- * sba_fill_pdir - write allocated SG entries into IO PDIR
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @startsg: list of IOVA/size pairs
- * @nents: number of entries in startsg list
- *
- * Take preprocessed SG list and write corresponding entries
- * in the IO PDIR.
- */
- static SBA_INLINE int
- sba_fill_pdir(
- struct ioc *ioc,
- struct scatterlist *startsg,
- int nents)
- {
- struct scatterlist *dma_sg = startsg; /* pointer to current DMA */
- int n_mappings = 0;
- u64 *pdirp = 0;
- unsigned long dma_offset = 0;
- dma_sg--;
- while (nents-- > 0) {
- int cnt = sg_dma_len(startsg);
- sg_dma_len(startsg) = 0;
- #ifdef DEBUG_LARGE_SG_ENTRIES
- if (dump_run_sg)
- printk(KERN_DEBUG " %2d : %08lx/%05x %p/%05xn",
- nents,
- (unsigned long) sg_dma_address(startsg), cnt,
- sg_virt_address(startsg), startsg->length
- );
- #else
- DBG_RUN_SG(" %d : %08lx/%05x %p/%05xn",
- nents,
- (unsigned long) sg_dma_address(startsg), cnt,
- sg_virt_addr(startsg), startsg->length
- );
- #endif
- /*
- ** Look for the start of a new DMA stream
- */
- if (sg_dma_address(startsg) & PIDE_FLAG) {
- u32 pide = sg_dma_address(startsg) & ~PIDE_FLAG;
- dma_offset = (unsigned long) pide & ~IOVP_MASK;
- sg_dma_address(startsg) = 0;
- dma_sg++;
- sg_dma_address(dma_sg) = pide;
- pdirp = &(ioc->pdir_base[pide >> IOVP_SHIFT]);
- n_mappings++;
- }
- /*
- ** Look for a VCONTIG chunk
- */
- if (cnt) {
- unsigned long vaddr = (unsigned long) sg_virt_addr(startsg);
- ASSERT(pdirp);
- /* Since multiple Vcontig blocks could make up
- ** one DMA stream, *add* cnt to dma_len.
- */
- sg_dma_len(dma_sg) += cnt;
- cnt += dma_offset;
- dma_offset=0; /* only want offset on first chunk */
- cnt = ROUNDUP(cnt, IOVP_SIZE);
- #ifdef CONFIG_PROC_FS
- ioc->msg_pages += cnt >> IOVP_SHIFT;
- #endif
- do {
- sba_io_pdir_entry(pdirp, KERNEL_SPACE, vaddr);
- vaddr += IOVP_SIZE;
- cnt -= IOVP_SIZE;
- pdirp++;
- } while (cnt > 0);
- }
- startsg++;
- }
- #ifdef DEBUG_LARGE_SG_ENTRIES
- dump_run_sg = 0;
- #endif
- return(n_mappings);
- }
- /*
- ** Two address ranges are DMA contiguous *iff* "end of prev" and
- ** "start of next" are both on a page boundry.
- **
- ** (shift left is a quick trick to mask off upper bits)
- */
- #define DMA_CONTIG(__X, __Y)
- (((((unsigned long) __X) | ((unsigned long) __Y)) << (BITS_PER_LONG - PAGE_SHIFT)) == 0UL)
- /**
- * sba_coalesce_chunks - preprocess the SG list
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @startsg: list of IOVA/size pairs
- * @nents: number of entries in startsg list
- *
- * First pass is to walk the SG list and determine where the breaks are
- * in the DMA stream. Allocates PDIR entries but does not fill them.
- * Returns the number of DMA chunks.
- *
- * Doing the fill seperate from the coalescing/allocation keeps the
- * code simpler. Future enhancement could make one pass through
- * the sglist do both.
- */
- static SBA_INLINE int
- sba_coalesce_chunks( struct ioc *ioc,
- struct scatterlist *startsg,
- int nents)
- {
- struct scatterlist *vcontig_sg; /* VCONTIG chunk head */
- unsigned long vcontig_len; /* len of VCONTIG chunk */
- unsigned long vcontig_end;
- struct scatterlist *dma_sg; /* next DMA stream head */
- unsigned long dma_offset, dma_len; /* start/len of DMA stream */
- int n_mappings = 0;
- while (nents > 0) {
- unsigned long vaddr = (unsigned long) sg_virt_addr(startsg);
- /*
- ** Prepare for first/next DMA stream
- */
- dma_sg = vcontig_sg = startsg;
- dma_len = vcontig_len = vcontig_end = startsg->length;
- vcontig_end += vaddr;
- dma_offset = vaddr & ~IOVP_MASK;
- /* PARANOID: clear entries */
- sg_dma_address(startsg) = 0;
- sg_dma_len(startsg) = 0;
- /*
- ** This loop terminates one iteration "early" since
- ** it's always looking one "ahead".
- */
- while (--nents > 0) {
- unsigned long vaddr; /* tmp */
- startsg++;
- /* PARANOID: clear entries */
- sg_dma_address(startsg) = 0;
- sg_dma_len(startsg) = 0;
- /* catch brokenness in SCSI layer */
- ASSERT(startsg->length <= DMA_CHUNK_SIZE);
- /*
- ** First make sure current dma stream won't
- ** exceed DMA_CHUNK_SIZE if we coalesce the
- ** next entry.
- */
- if (((dma_len + dma_offset + startsg->length + ~IOVP_MASK) & IOVP_MASK) > DMA_CHUNK_SIZE)
- break;
- /*
- ** Then look for virtually contiguous blocks.
- ** PARISC needs to associate a virtual address
- ** with each IO address mapped. The CPU cache is
- ** virtually tagged and the IOMMU uses part
- ** of the virtual address to participate in
- ** CPU cache coherency.
- **
- ** append the next transaction?
- */
- vaddr = (unsigned long) sg_virt_addr(startsg);
- if (vcontig_end == vaddr)
- {
- vcontig_len += startsg->length;
- vcontig_end += startsg->length;
- dma_len += startsg->length;
- continue;
- }
- #ifdef DEBUG_LARGE_SG_ENTRIES
- dump_run_sg = (vcontig_len > IOVP_SIZE);
- #endif
- /*
- ** Not virtually contigous.
- ** Terminate prev chunk.
- ** Start a new chunk.
- **
- ** Once we start a new VCONTIG chunk, dma_offset
- ** can't change. And we need the offset from the first
- ** chunk - not the last one. Ergo Successive chunks
- ** must start on page boundaries and dove tail
- ** with it's predecessor.
- */
- sg_dma_len(vcontig_sg) = vcontig_len;
- vcontig_sg = startsg;
- vcontig_len = startsg->length;
- /*
- ** 3) do the entries end/start on page boundaries?
- ** Don't update vcontig_end until we've checked.
- */
- if (DMA_CONTIG(vcontig_end, vaddr))
- {
- vcontig_end = vcontig_len + vaddr;
- dma_len += vcontig_len;
- continue;
- } else {
- break;
- }
- }
- /*
- ** End of DMA Stream
- ** Terminate last VCONTIG block.
- ** Allocate space for DMA stream.
- */
- sg_dma_len(vcontig_sg) = vcontig_len;
- dma_len = (dma_len + dma_offset + ~IOVP_MASK) & IOVP_MASK;
- ASSERT(dma_len <= DMA_CHUNK_SIZE);
- sg_dma_address(dma_sg) =
- PIDE_FLAG
- | (sba_alloc_range(ioc, dma_len) << IOVP_SHIFT)
- | dma_offset;
- n_mappings++;
- }
- return n_mappings;
- }
- /**
- * sba_map_sg - map Scatter/Gather list
- * @dev: instance of PCI owned by the driver that's asking.
- * @sglist: array of buffer/length pairs
- * @nents: number of entries in list
- * @direction: R/W or both.
- *
- * See Documentation/DMA-mapping.txt
- */
- static int
- sba_map_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction)
- {
- struct ioc *ioc;
- int coalesced, filled = 0;
- unsigned long flags;
- DBG_RUN_SG("%s() START %d entriesn", __FUNCTION__, nents);
- ASSERT(dev->sysdata);
- ioc = GET_IOC(dev);
- ASSERT(ioc);
- /* Fast path single entry scatterlists. */
- if (nents == 1) {
- sg_dma_address(sglist) = sba_map_single(dev,
- sg_virt_addr(sglist),
- sglist->length, direction);
- sg_dma_len(sglist) = sglist->length;
- return 1;
- }
- spin_lock_irqsave(&ioc->res_lock, flags);
- #ifdef ASSERT_PDIR_SANITY
- if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
- {
- sba_dump_sg(ioc, sglist, nents);
- panic("Check before sba_map_sg()");
- }
- #endif
- #ifdef CONFIG_PROC_FS
- ioc->msg_calls++;
- #endif
- /*
- ** First coalesce the chunks and allocate I/O pdir space
- **
- ** If this is one DMA stream, we can properly map using the
- ** correct virtual address associated with each DMA page.
- ** w/o this association, we wouldn't have coherent DMA!
- ** Access to the virtual address is what forces a two pass algorithm.
- */
- coalesced = sba_coalesce_chunks(ioc, sglist, nents);
- /*
- ** Program the I/O Pdir
- **
- ** map the virtual addresses to the I/O Pdir
- ** o dma_address will contain the pdir index
- ** o dma_len will contain the number of bytes to map
- ** o address contains the virtual address.
- */
- filled = sba_fill_pdir(ioc, sglist, nents);
- #ifdef ASSERT_PDIR_SANITY
- if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
- {
- sba_dump_sg(ioc, sglist, nents);
- panic("Check after sba_map_sg()n");
- }
- #endif
- spin_unlock_irqrestore(&ioc->res_lock, flags);
- ASSERT(coalesced == filled);
- DBG_RUN_SG("%s() DONE %d mappingsn", __FUNCTION__, filled);
- return filled;
- }
- /**
- * sba_unmap_sg - unmap Scatter/Gather list
- * @dev: instance of PCI owned by the driver that's asking.
- * @sglist: array of buffer/length pairs
- * @nents: number of entries in list
- * @direction: R/W or both.
- *
- * See Documentation/DMA-mapping.txt
- */
- static void
- sba_unmap_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction)
- {
- struct ioc *ioc;
- #ifdef ASSERT_PDIR_SANITY
- unsigned long flags;
- #endif
- DBG_RUN_SG("%s() START %d entries, %p,%xn",
- __FUNCTION__, nents, sg_virt_addr(sglist), sglist->length);
- ASSERT(dev->sysdata);
- ioc = GET_IOC(dev);
- ASSERT(ioc);
- #ifdef CONFIG_PROC_FS
- ioc->usg_calls++;
- #endif
- #ifdef ASSERT_PDIR_SANITY
- spin_lock_irqsave(&ioc->res_lock, flags);
- sba_check_pdir(ioc,"Check before sba_unmap_sg()");
- spin_unlock_irqrestore(&ioc->res_lock, flags);
- #endif
- while (sg_dma_len(sglist) && nents--) {
- sba_unmap_single(dev, sg_dma_address(sglist), sg_dma_len(sglist), direction);
- #ifdef CONFIG_PROC_FS
- ioc->usg_pages += ((sg_dma_address(sglist) & ~IOVP_MASK) + sg_dma_len(sglist) + IOVP_SIZE - 1) >> PAGE_SHIFT;
- ioc->usingle_calls--; /* kluge since call is unmap_sg() */
- #endif
- ++sglist;
- }
- DBG_RUN_SG("%s() DONE (nents %d)n", __FUNCTION__, nents);
- #ifdef ASSERT_PDIR_SANITY
- spin_lock_irqsave(&ioc->res_lock, flags);
- sba_check_pdir(ioc,"Check after sba_unmap_sg()");
- spin_unlock_irqrestore(&ioc->res_lock, flags);
- #endif
- }
- static struct pci_dma_ops sba_ops = {
- sba_dma_supported,
- sba_alloc_consistent, /* allocate cacheable host mem */
- sba_free_consistent, /* release cacheable host mem */
- sba_map_single,
- sba_unmap_single,
- sba_map_sg,
- sba_unmap_sg,
- NULL, /* dma_sync_single */
- NULL /* dma_sync_sg */
- };
- /**************************************************************************
- **
- ** SBA PAT PDC support
- **
- ** o call pdc_pat_cell_module()
- ** o store ranges in PCI "resource" structures
- **
- **************************************************************************/
- static void
- sba_get_pat_resources(struct sba_device *sba_dev)
- {
- #if 0
- /*
- ** TODO/REVISIT/FIXME: support for directed ranges requires calls to
- ** PAT PDC to program the SBA/LBA directed range registers...this
- ** burden may fall on the LBA code since it directly supports the
- ** PCI subsystem. It's not clear yet. - ggg
- */
- PAT_MOD(mod)->mod_info.mod_pages = PAT_GET_MOD_PAGES(temp);
- FIXME : ???
- PAT_MOD(mod)->mod_info.dvi = PAT_GET_DVI(temp);
- Tells where the dvi bits are located in the address.
- PAT_MOD(mod)->mod_info.ioc = PAT_GET_IOC(temp);
- FIXME : ???
- #endif
- }
- /**************************************************************
- *
- * Initialization and claim
- *
- ***************************************************************/
- #define PIRANHA_ADDR_MASK 0x00160000UL /* bit 17,18,20 */
- #define PIRANHA_ADDR_VAL 0x00060000UL /* bit 17,18 on */
- static void *
- sba_alloc_pdir(unsigned int pdir_size)
- {
- unsigned long pdir_base;
- unsigned long pdir_order = get_order(pdir_size);
- pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);
- if (NULL == (void *) pdir_base)
- panic("sba_ioc_init() could not allocate I/O Page Tablen");
- /* If this is not PA8700 (PCX-W2)
- ** OR newer than ver 2.2
- ** OR in a system that doesn't need VINDEX bits from SBA,
- **
- ** then we aren't exposed to the HW bug.
- */
- if ( ((boot_cpu_data.pdc.cpuid >> 5) & 0x7f) != 0x13
- || (boot_cpu_data.pdc.versions > 0x202)
- || (boot_cpu_data.pdc.capabilities & 0x08L) )
- return (void *) pdir_base;
- /*
- * PA8700 (PCX-W2, aka piranha) silent data corruption fix
- *
- * An interaction between PA8700 CPU (Ver 2.2 or older) and
- * Ike/Astro can cause silent data corruption. This is only
- * a problem if the I/O PDIR is located in memory such that
- * (little-endian) bits 17 and 18 are on and bit 20 is off.
- *
- * Since the max IO Pdir size is 2MB, by cleverly allocating the
- * right physical address, we can either avoid (IOPDIR <= 1MB)
- * or minimize (2MB IO Pdir) the problem if we restrict the
- * IO Pdir to a maximum size of 2MB-128K (1902K).
- *
- * Because we always allocate 2^N sized IO pdirs, either of the
- * "bad" regions will be the last 128K if at all. That's easy
- * to test for.
- *
- */
- if (pdir_order <= (19-12)) {
- if (((virt_to_phys(pdir_base)+pdir_size-1) & PIRANHA_ADDR_MASK) == PIRANHA_ADDR_VAL) {
- /* allocate a new one on 512k alignment */
- unsigned long new_pdir = __get_free_pages(GFP_KERNEL, (19-12));
- /* release original */
- free_pages(pdir_base, pdir_order);
- pdir_base = new_pdir;
- /* release excess */
- while (pdir_order < (19-12)) {
- new_pdir += pdir_size;
- free_pages(new_pdir, pdir_order);
- pdir_order +=1;
- pdir_size <<=1;
- }
- }
- } else {
- /*
- ** 1MB or 2MB Pdir
- ** Needs to be aligned on an "odd" 1MB boundary.
- */
- unsigned long new_pdir = __get_free_pages(GFP_KERNEL, pdir_order+1); /* 2 or 4MB */
- /* release original */
- free_pages( pdir_base, pdir_order);
- /* release first 1MB */
- free_pages(new_pdir, 20-12);
- pdir_base = new_pdir + 1024*1024;
- if (pdir_order > (20-12)) {
- /*
- ** 2MB Pdir.
- **
- ** Flag tells init_bitmap() to mark bad 128k as used
- ** and to reduce the size by 128k.
- */
- piranha_bad_128k = 1;
- new_pdir += 3*1024*1024;
- /* release last 1MB */
- free_pages(new_pdir, 20-12);
- /* release unusable 128KB */
- free_pages(new_pdir - 128*1024 , 17-12);
- pdir_size -= 128*1024;
- }
- }
- memset((void *) pdir_base, 0, pdir_size);
- return (void *) pdir_base;
- }
- static void
- sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
- {
- /* lba_set_iregs() is in arch/parisc/kernel/lba_pci.c */
- extern void lba_set_iregs(struct parisc_device *, u32, u32);
- u32 iova_space_size, iova_space_mask;
- int pdir_size, iov_order;
- unsigned long physmem;
- struct parisc_device *lba;
- /*
- ** Determine IOVA Space size from memory size.
- **
- ** Ideally, PCI drivers would register the maximum number
- ** of DMA they can have outstanding for each device they
- ** own. Next best thing would be to guess how much DMA
- ** can be outstanding based on PCI Class/sub-class. Both
- ** methods still require some "extra" to support PCI
- ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
- **
- ** While we have 32-bits "IOVA" space, top two 2 bits are used
- ** for DMA hints - ergo only 30 bits max.
- */
- physmem = num_physpages << PAGE_SHIFT;
- iova_space_size = (u32) (physmem/(sba_mem_ratio*global_ioc_cnt));
- /* limit IOVA space size to 1MB-1GB */
- if (iova_space_size < 1024*1024) {
- iova_space_size = 1024*1024;
- }
- #ifdef __LP64__
- else if (iova_space_size > 512*1024*1024) {
- iova_space_size = 512*1024*1024;
- }
- #endif
- /*
- ** iova space must be log2() in size.
- ** thus, pdir/res_map will also be log2().
- ** PIRANHA BUG: Exception is when IO Pdir is 2MB (gets reduced)
- */
- iov_order = get_order(iova_space_size >> (IOVP_SHIFT-PAGE_SHIFT));
- ASSERT(iov_order <= (30 - IOVP_SHIFT)); /* iova_space_size <= 1GB */
- ASSERT(iov_order >= (20 - IOVP_SHIFT)); /* iova_space_size >= 1MB */
- iova_space_size = 1 << (iov_order + IOVP_SHIFT);
- ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof(u64);
- ASSERT(pdir_size < 4*1024*1024); /* max pdir size == 2MB */
- /* Verify it's a power of two */
- ASSERT((1 << get_order(pdir_size)) == (pdir_size >> PAGE_SHIFT));
- DBG_INIT("%s() hpa 0x%lx mem %dMB IOV %dMB (%d bits) PDIR size 0x%0xn",
- __FUNCTION__, ioc->ioc_hpa, (int) (physmem>>20),
- iova_space_size>>20, iov_order + PAGE_SHIFT, pdir_size);
- /* FIXME : DMA HINTs not used */
- ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
- ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
- ioc->pdir_base = sba_alloc_pdir(pdir_size);
- DBG_INIT("%s() pdir %p size %x hint_shift_pdir %x hint_mask_pdir %lxn",
- __FUNCTION__, ioc->pdir_base, pdir_size,
- ioc->hint_shift_pdir, ioc->hint_mask_pdir);
- ASSERT((((unsigned long) ioc->pdir_base) & PAGE_MASK) == (unsigned long) ioc->pdir_base);
- WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
- /* build IMASK for IOC and Elroy */
- iova_space_mask = 0xffffffff;
- iova_space_mask <<= (iov_order + PAGE_SHIFT);
- /*
- ** On C3000 w/512MB mem, HP-UX 10.20 reports:
- ** ibase=0, imask=0xFE000000, size=0x2000000.
- */
- ioc->ibase = IOC_IOVA_SPACE_BASE | 1; /* bit 0 == enable bit */
- ioc->imask = iova_space_mask; /* save it */
- DBG_INIT("%s() IOV base 0x%lx mask 0x%0lxn",
- __FUNCTION__, ioc->ibase, ioc->imask);
- /*
- ** FIXME: Hint registers are programmed with default hint
- ** values during boot, so hints should be sane even if we
- ** can't reprogram them the way drivers want.
- */
- /*
- ** setup Elroy IBASE/IMASK registers as well.
- */
- for (lba = sba->child; lba; lba = lba->sibling) {
- int rope_num = (lba->hpa >> 13) & 0xf;
- if (rope_num >> 3 == ioc_num)
- lba_set_iregs(lba, ioc->ibase, ioc->imask);
- }
- /*
- ** Program the IOC's ibase and enable IOVA translation
- */
- WRITE_REG(ioc->ibase, ioc->ioc_hpa+IOC_IBASE);
- WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
- /* Set I/O PDIR Page size to 4K */
- WRITE_REG(0, ioc->ioc_hpa+IOC_TCNFG);
- /*
- ** Clear I/O TLB of any possible entries.
- ** (Yes. This is a bit paranoid...but so what)
- */
- WRITE_REG(0 | 31, ioc->ioc_hpa+IOC_PCOM);
- DBG_INIT("%s() DONEn", __FUNCTION__);
- }
- /**************************************************************************
- **
- ** SBA initialization code (HW and SW)
- **
- ** o identify SBA chip itself
- ** o initialize SBA chip modes (HardFail)
- ** o initialize SBA chip modes (HardFail)
- ** o FIXME: initialize DMA hints for reasonable defaults
- **
- **************************************************************************/
- static void
- sba_hw_init(struct sba_device *sba_dev)
- {
- int i;
- int num_ioc;
- u64 ioc_ctl;
- ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
- DBG_INIT("%s() hpa 0x%lx ioc_ctl 0x%Lx ->",
- __FUNCTION__, sba_dev->sba_hpa, ioc_ctl);
- ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
- ioc_ctl |= IOC_CTRL_TC; /* Astro: firmware enables this */
- WRITE_REG(ioc_ctl, sba_dev->sba_hpa+IOC_CTRL);
- #ifdef DEBUG_SBA_INIT
- ioc_ctl = READ_REG64(sba_dev->sba_hpa+IOC_CTRL);
- DBG_INIT(" 0x%Lxn", ioc_ctl);
- #endif
- if (IS_ASTRO(sba_dev->iodc)) {
- /* PAT_PDC (L-class) also reports the same goofy base */
- sba_dev->ioc[0].ioc_hpa = ASTRO_IOC_OFFSET;
- num_ioc = 1;
- } else {
- sba_dev->ioc[0].ioc_hpa = sba_dev->ioc[1].ioc_hpa = 0;
- num_ioc = 2;
- }
- sba_dev->num_ioc = num_ioc;
- for (i = 0; i < num_ioc; i++) {
- sba_dev->ioc[i].ioc_hpa += sba_dev->sba_hpa + IKE_IOC_OFFSET(i);
- /*
- ** Make sure the box crashes if we get any errors on a rope.
- */
- WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE0_CTL);
- WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE1_CTL);
- WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE2_CTL);
- WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE3_CTL);
- WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE4_CTL);
- WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE5_CTL);
- WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE6_CTL);
- WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
- /* flush out the writes */
- READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
- sba_ioc_init(sba_dev->dev, &(sba_dev->ioc[i]), i);
- }
- }
- static void
- sba_common_init(struct sba_device *sba_dev)
- {
- int i;
- /* add this one to the head of the list (order doesn't matter)
- ** This will be useful for debugging - especially if we get coredumps
- */
- sba_dev->next = sba_list;
- sba_list = sba_dev;
- for(i=0; i< sba_dev->num_ioc; i++) {
- int res_size;
- #ifdef DEBUG_DMB_TRAP
- extern void iterate_pages(unsigned long , unsigned long ,
- void (*)(pte_t * , unsigned long),
- unsigned long );
- void set_data_memory_break(pte_t * , unsigned long);
- #endif
- /* resource map size dictated by pdir_size */
- res_size = sba_dev->ioc[i].pdir_size/sizeof(u64); /* entries */
- /* Second part of PIRANHA BUG */
- if (piranha_bad_128k) {
- res_size -= (128*1024)/sizeof(u64);
- }
- res_size >>= 3; /* convert bit count to byte count */
- DBG_INIT("%s() res_size 0x%xn",
- __FUNCTION__, res_size);
- sba_dev->ioc[i].res_size = res_size;
- sba_dev->ioc[i].res_map = (char *) __get_free_pages(GFP_KERNEL, get_order(res_size));
- #ifdef DEBUG_DMB_TRAP
- iterate_pages( sba_dev->ioc[i].res_map, res_size,
- set_data_memory_break, 0);
- #endif
- if (NULL == sba_dev->ioc[i].res_map)
- {
- panic(__FILE__ ":%s() could not allocate resource mapn", __FUNCTION__ );
- }
- memset(sba_dev->ioc[i].res_map, 0, res_size);
- /* next available IOVP - circular search */
- sba_dev->ioc[i].res_hint = (unsigned long *)
- &(sba_dev->ioc[i].res_map[L1_CACHE_BYTES]);
- #ifdef ASSERT_PDIR_SANITY
- /* Mark first bit busy - ie no IOVA 0 */
- sba_dev->ioc[i].res_map[0] = 0x80;
- sba_dev->ioc[i].pdir_base[0] = 0xeeffc0addbba0080ULL;
- #endif
- /* Third (and last) part of PIRANHA BUG */
- if (piranha_bad_128k) {
- /* region from +1408K to +1536 is un-usable. */
- int idx_start = (1408*1024/sizeof(u64)) >> 3;
- int idx_end = (1536*1024/sizeof(u64)) >> 3;
- long *p_start = (long *) &(sba_dev->ioc[i].res_map[idx_start]);
- long *p_end = (long *) &(sba_dev->ioc[i].res_map[idx_end]);
- /* mark that part of the io pdir busy */
- while (p_start < p_end)
- *p_start++ = -1;
-
- }
- #ifdef DEBUG_DMB_TRAP
- iterate_pages( sba_dev->ioc[i].res_map, res_size,
- set_data_memory_break, 0);
- iterate_pages( sba_dev->ioc[i].pdir_base, sba_dev->ioc[i].pdir_size,
- set_data_memory_break, 0);
- #endif
- DBG_INIT("%s() %d res_map %x %pn",
- __FUNCTION__, i, res_size, sba_dev->ioc[i].res_map);
- }
- sba_dev->sba_lock = SPIN_LOCK_UNLOCKED;
- ioc_needs_fdc = boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC;
- #ifdef DEBUG_SBA_INIT
- /*
- * If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
- * (bit #61, big endian), we have to flush and sync every time
- * IO-PDIR is changed in Ike/Astro.
- */
- if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC) {
- printk(KERN_INFO MODULE_NAME " FDC/SYNC required.n");
- } else {
- printk(KERN_INFO MODULE_NAME " IOC has cache coherent PDIR.n");
- }
- #endif
- }
- #ifdef CONFIG_PROC_FS
- static int sba_proc_info(char *buf, char **start, off_t offset, int len)
- {
- struct sba_device *sba_dev = sba_list;
- struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Multi-IOC support! */
- int total_pages = (int) (ioc->res_size << 3); /* 8 bits per byte */
- unsigned long i = 0, avg = 0, min, max;
- sprintf(buf, "%s rev %d.%dn",
- sba_dev->name,
- (sba_dev->hw_rev & 0x7) + 1,
- (sba_dev->hw_rev & 0x18) >> 3
- );
- sprintf(buf, "%sIO PDIR size : %d bytes (%d entries)n",
- buf,
- (int) ((ioc->res_size << 3) * sizeof(u64)), /* 8 bits/byte */
- total_pages);
- sprintf(buf, "%sIO PDIR entries : %ld free %ld used (%d%%)n", buf,
- total_pages - ioc->used_pages, ioc->used_pages,
- (int) (ioc->used_pages * 100 / total_pages));
-
- sprintf(buf, "%sResource bitmap : %d bytes (%d pages)n",
- buf, ioc->res_size, ioc->res_size << 3); /* 8 bits per byte */
- min = max = ioc->avg_search[0];
- for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
- avg += ioc->avg_search[i];
- if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
- if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
- }
- avg /= SBA_SEARCH_SAMPLE;
- sprintf(buf, "%s Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)n",
- buf, min, avg, max);
- sprintf(buf, "%spci_map_single(): %12ld calls %12ld pages (avg %d/1000)n",
- buf, ioc->msingle_calls, ioc->msingle_pages,
- (int) ((ioc->msingle_pages * 1000)/ioc->msingle_calls));
- /* KLUGE - unmap_sg calls unmap_single for each mapped page */
- min = ioc->usingle_calls;
- max = ioc->usingle_pages - ioc->usg_pages;
- sprintf(buf, "%spci_unmap_single: %12ld calls %12ld pages (avg %d/1000)n",
- buf, min, max,
- (int) ((max * 1000)/min));
- sprintf(buf, "%spci_map_sg() : %12ld calls %12ld pages (avg %d/1000)n",
- buf, ioc->msg_calls, ioc->msg_pages,
- (int) ((ioc->msg_pages * 1000)/ioc->msg_calls));
- sprintf(buf, "%spci_unmap_sg() : %12ld calls %12ld pages (avg %d/1000)n",
- buf, ioc->usg_calls, ioc->usg_pages,
- (int) ((ioc->usg_pages * 1000)/ioc->usg_calls));
- return strlen(buf);
- }
- #if 0
- /* XXX too much output - exceeds 4k limit and needs to be re-written */
- static int
- sba_resource_map(char *buf, char **start, off_t offset, int len)
- {
- struct sba_device *sba_dev = sba_list;
- struct ioc *ioc = &sba_dev->ioc[0]; /* FIXME: Mutli-IOC suppoer! */
- unsigned int *res_ptr = (unsigned int *)ioc->res_map;
- int i;
- buf[0] = '';
- for(i = 0; i < (ioc->res_size / sizeof(unsigned int)); ++i, ++res_ptr) {
- if ((i & 7) == 0)
- strcat(buf,"n ");
- sprintf(buf, "%s %08x", buf, *res_ptr);
- }
- strcat(buf, "n");
- return strlen(buf);
- }
- #endif /* 0 */
- #endif /* CONFIG_PROC_FS */
- static struct parisc_device_id sba_tbl[] = {
- { HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0xb },
- { HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0xc },
- { HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0xc },
- { HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0xc },
- /* These two entries commented out because we don't find them in a
- * buswalk yet. If/when we do, they would cause us to think we had
- * many more SBAs then we really do.
- * { HPHW_BCPORT, HVERSION_REV_ANY_ID, ASTRO_ROPES_PORT, 0xc },
- * { HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_ROPES_PORT, 0xc },
- */
- { 0, }
- };
- int sba_driver_callback(struct parisc_device *);
- static struct parisc_driver sba_driver = {
- name: MODULE_NAME,
- id_table: sba_tbl,
- probe: sba_driver_callback,
- };
- /*
- ** Determine if lba should claim this chip (return 0) or not (return 1).
- ** If so, initialize the chip and tell other partners in crime they
- ** have work to do.
- */
- int
- sba_driver_callback(struct parisc_device *dev)
- {
- struct sba_device *sba_dev;
- u32 func_class;
- int i;
- char *version;
- #ifdef DEBUG_SBA_INIT
- sba_dump_ranges(dev->hpa);
- #endif
- /* Read HW Rev First */
- func_class = READ_REG(dev->hpa + SBA_FCLASS);
- if (IS_ASTRO(&dev->id)) {
- unsigned long fclass;
- static char astro_rev[]="Astro ?.?";
- /* Astro is broken...Read HW Rev First */
- fclass = READ_REG(dev->hpa);
- astro_rev[6] = '1' + (char) (fclass & 0x7);
- astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3);
- version = astro_rev;
- } else if (IS_IKE(&dev->id)) {
- static char ike_rev[]="Ike rev ?";
- ike_rev[8] = '0' + (char) (func_class & 0xff);
- version = ike_rev;
- } else {
- static char reo_rev[]="REO rev ?";
- reo_rev[8] = '0' + (char) (func_class & 0xff);
- version = reo_rev;
- }
- if (!global_ioc_cnt) {
- global_ioc_cnt = count_parisc_driver(&sba_driver);
- /* Only Astro has one IOC per SBA */
- if (!IS_ASTRO(&dev->id))
- global_ioc_cnt *= 2;
- }
- printk(KERN_INFO "%s found %s at 0x%lxn",
- MODULE_NAME, version, dev->hpa);
- #ifdef DEBUG_SBA_INIT
- sba_dump_tlb(dev->hpa);
- #endif
- sba_dev = kmalloc(sizeof(struct sba_device), GFP_KERNEL);
- if (NULL == sba_dev) {
- printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_devicen");
- return(1);
- }
- dev->sysdata = (void *) sba_dev;
- memset(sba_dev, 0, sizeof(struct sba_device));
- for(i=0; i<MAX_IOC; i++)
- spin_lock_init(&(sba_dev->ioc[i].res_lock));
- sba_dev->dev = dev;
- sba_dev->hw_rev = func_class;
- sba_dev->iodc = &dev->id;
- sba_dev->name = dev->name;
- sba_dev->sba_hpa = dev->hpa; /* faster access */
- sba_get_pat_resources(sba_dev);
- sba_hw_init(sba_dev);
- sba_common_init(sba_dev);
- hppa_dma_ops = &sba_ops;
- #ifdef CONFIG_PROC_FS
- if (IS_ASTRO(&dev->id)) {
- create_proc_info_entry("Astro", 0, proc_runway_root, sba_proc_info);
- } else if (IS_IKE(&dev->id)) {
- create_proc_info_entry("Ike", 0, proc_runway_root, sba_proc_info);
- } else {
- create_proc_info_entry("Reo", 0, proc_runway_root, sba_proc_info);
- }
- #if 0
- create_proc_info_entry("bitmap", 0, proc_runway_root, sba_resource_map);
- #endif
- #endif
- return 0;
- }
- /*
- ** One time initialization to let the world know the SBA was found.
- ** This is the only routine which is NOT static.
- ** Must be called exactly once before pci_init().
- */
- void __init sba_init(void)
- {
- register_parisc_driver(&sba_driver);
- }
- /**
- * sba_get_iommu - Assign the iommu pointer for the pci bus controller.
- * @dev: The parisc device.
- *
- * This function searches through the registerd IOMMU's and returns the
- * appropriate IOMMU data for the given parisc PCI controller.
- */
- void * sba_get_iommu(struct parisc_device *pci_hba)
- {
- struct sba_device *sba = (struct sba_device *) pci_hba->parent->sysdata;
- char t = pci_hba->parent->id.hw_type;
- int iocnum = (pci_hba->hw_path >> 3); /* rope # */
- if ((t!=HPHW_IOA) && (t!=HPHW_BCPORT))
- BUG();
- return &(sba->ioc[iocnum]);
- }