Quelle sba_iommu.c
Sprache: C
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* * System Bus Adapter ( SBA ) I / O MMU manager
* *
* * ( c ) Copyright 2000 - 2004 Grant Grundler < grundler @ parisc - linux x org >
* * ( c ) Copyright 2004 Naresh Kumar Inna < knaresh at india x hp x com >
* * ( c ) Copyright 2000 - 2004 Hewlett - Packard Company
* *
* * Portions ( c ) 1999 Dave S . Miller ( from sparc64 I / O MMU code )
* *
* *
* *
* * 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/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>
#include <linux/pci.h>
#include <linux/dma-map-ops.h>
#include <linux/scatterlist.h>
#include <linux/iommu-helper.h>
/*
* The semantics of 64 register access on 32 bit systems can ' t be guaranteed
* by the C standard , we hope the _ lo_hi ( ) macros defining readq and writeq
* here will behave as expected .
*/
#include <linux/io-64 -nonatomic-lo-hi.h>
#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 <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <asm /ropes.h>
#include <asm /page.h> /* for PAGE0 */
#include <asm /pdc.h> /* for PDC_MODEL_* */
#include <asm /pdcpat.h> /* for is_pdc_pat() */
#include <asm /parisc-device.h>
#include "iommu.h"
#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
#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
#define DEFAULT_DMA_HINT_REG 0
struct sba_device *sba_list;
EXPORT_SYMBOL_GPL(sba_list);
static unsigned long ioc_needs_fdc = 0 ;
/* 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))
#ifdef CONFIG_AGP_PARISC
#define SBA_AGP_SUPPORT
#endif /*CONFIG_AGP_PARISC*/
#ifdef SBA_AGP_SUPPORT
static int sba_reserve_agpgart = 1 ;
module_param(sba_reserve_agpgart, int , 0444 );
MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART" );
#endif
static struct proc_dir_entry *proc_runway_root __ro_after_init;
static struct proc_dir_entry *proc_mckinley_root __ro_after_init;
/************************************
* * 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) readl(addr)
#define READ_REG64(addr) readq(addr)
#define WRITE_REG32(val, addr) writel((val), (addr))
#define WRITE_REG64(val, addr) writeq((val), (addr))
#ifdef CONFIG_64BIT
#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 CONFIG_64BIT 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(void __iomem *hpa)
{
DBG_INIT("SBA at 0x%p\n" , hpa);
DBG_INIT("IOS_DIST_BASE : %Lx\n" , READ_REG64(hpa+IOS_DIST_BASE));
DBG_INIT("IOS_DIST_MASK : %Lx\n" , READ_REG64(hpa+IOS_DIST_MASK));
DBG_INIT("IOS_DIST_ROUTE : %Lx\n" , READ_REG64(hpa+IOS_DIST_ROUTE));
DBG_INIT("\n" );
DBG_INIT("IOS_DIRECT_BASE : %Lx\n" , READ_REG64(hpa+IOS_DIRECT_BASE));
DBG_INIT("IOS_DIRECT_MASK : %Lx\n" , READ_REG64(hpa+IOS_DIRECT_MASK));
DBG_INIT("IOS_DIRECT_ROUTE: %Lx\n" , 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(void __iomem *hpa)
{
DBG_INIT("IO TLB at 0x%p\n" , hpa);
DBG_INIT("IOC_IBASE : 0x%Lx\n" , READ_REG64(hpa+IOC_IBASE));
DBG_INIT("IOC_IMASK : 0x%Lx\n" , READ_REG64(hpa+IOC_IMASK));
DBG_INIT("IOC_TCNFG : 0x%Lx\n" , READ_REG64(hpa+IOC_TCNFG));
DBG_INIT("IOC_PDIR_BASE: 0x%Lx\n" , READ_REG64(hpa+IOC_PDIR_BASE));
DBG_INIT("\n" );
}
#else
#define sba_dump_ranges(x)
#define sba_dump_tlb(x)
#endif /* DEBUG_SBA_INIT */
#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 */
__le64 *ptr = &(ioc->pdir_base[pide & (~0 U * 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%lx\n" ,
msg,
rptr, pide & (BITS_PER_LONG - 1 ), *rptr);
rcnt = 0 ;
while (rcnt < BITS_PER_LONG) {
printk(KERN_DEBUG "%s %2d %p %016Lx\n" ,
(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) & 0 x80000000)
{
/*
* * 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/%05x\n" ,
nents,
(unsigned long ) sg_dma_address(startsg),
sg_dma_len(startsg),
sg_virt(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. */
#ifdef ZX1_SUPPORT
/* Pluto (aka ZX1) boxes need to set or clear the ibase bits appropriately */
#define SBA_IOVA(ioc,iovp,offset,hint_reg) ((ioc->ibase) | (iovp) | (offset))
#define SBA_IOVP(ioc,iova) ((iova) & (ioc)->iovp_mask)
#else
/* only support Astro and ancestors. Saves a few cycles in key places */
#define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset))
#define SBA_IOVP(ioc,iova) (iova)
#endif
#define PDIR_INDEX(iovp) ((iovp)>>IOVP_SHIFT)
#define RESMAP_MASK(n) (~0 UL << (BITS_PER_LONG - (n)))
#define RESMAP_IDX_MASK (sizeof (unsigned long ) - 1 )
static unsigned long ptr_to_pide(struct ioc *ioc, unsigned long *res_ptr,
unsigned int bitshiftcnt)
{
return (((unsigned long )res_ptr - (unsigned long )ioc->res_map) << 3 )
+ bitshiftcnt;
}
/**
* sba_search_bitmap - find free space in IO PDIR resource bitmap
* @ ioc : IO MMU structure which owns the pdir we are interested in .
* @ dev : device to query the bitmap for
* @ 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 unsigned long
sba_search_bitmap(struct ioc *ioc, struct device *dev,
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 = ~0 UL, tpide;
unsigned long boundary_size;
unsigned long shift;
int ret;
boundary_size = dma_get_seg_boundary_nr_pages(dev, IOVP_SHIFT);
#if defined (ZX1_SUPPORT)
BUG_ON(ioc->ibase & ~IOVP_MASK);
shift = ioc->ibase >> IOVP_SHIFT;
#else
shift = 0 ;
#endif
if (bits_wanted > (BITS_PER_LONG/2 )) {
/* Search word at a time - no mask needed */
for (; res_ptr < res_end; ++res_ptr) {
tpide = ptr_to_pide(ioc, res_ptr, 0 );
ret = iommu_is_span_boundary(tpide, bits_wanted,
shift,
boundary_size);
if ((*res_ptr == 0 ) && !ret) {
*res_ptr = RESMAP_MASK(bits_wanted);
pide = tpide;
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 = ALIGN(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" , __func__, o, res_ptr);
while (res_ptr < res_end)
{
DBG_RES(" %p %lx %lx\n" , res_ptr, mask, *res_ptr);
WARN_ON(mask == 0 );
tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt);
ret = iommu_is_span_boundary(tpide, bits_wanted,
shift,
boundary_size);
if ((((*res_ptr) & mask) == 0 ) && !ret) {
*res_ptr |= mask; /* mark resources busy! */
pide = tpide;
break ;
}
mask >>= o;
bitshiftcnt += o;
if (mask == 0 ) {
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 .
* @ dev : device for which pages should be alloced
* @ 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, struct device *dev, size_t size)
{
unsigned int pages_needed = size >> IOVP_SHIFT;
#ifdef SBA_COLLECT_STATS
unsigned long cr_start = mfctl(16 );
#endif
unsigned long pide;
pide = sba_search_bitmap(ioc, dev, pages_needed);
if (pide >= (ioc->res_size << 3 )) {
pide = sba_search_bitmap(ioc, dev, pages_needed);
if (pide >= (ioc->res_size << 3 ))
panic("%s: I/O MMU @ %p is out of mapping resources\n" ,
__FILE__, ioc->ioc_hpa);
}
#ifdef ASSERT_PDIR_SANITY
/* verify the first enable bit is clear */
if (0 x00 != ((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/%x\n" ,
__func__, size, pages_needed, pide,
(uint) ((unsigned long ) ioc->res_hint - (unsigned long ) ioc->res_map),
ioc->res_bitshift );
#ifdef SBA_COLLECT_STATS
{
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 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 %lx\n" ,
__func__, (uint) iova, size,
bits_not_wanted, m, pide, res_ptr, *res_ptr);
#ifdef SBA_COLLECT_STATS
ioc->used_pages -= bits_not_wanted;
#endif
*res_ptr &= ~m;
}
/**************************************************************
*
* " Dynamic DMA Mapping " support ( aka " Coherent I / O " )
*
***************************************************************/
#ifdef SBA_HINT_SUPPORT
#define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
#endif
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 - currently only support KERNEL_SPACE
* @ vba : Virtual CPU address of buffer to map
* @ hint : DMA hint set to use for this mapping
*
* 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 ) .
* Using the bass - ackwards HP bit numbering , Each IO Pdir entry
* for Astro / Ike looks like :
*
*
* 0 19 51 55 63
* + - + - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + - - - - + - - - - - - - - +
* | V | U | PPN [ 43 : 12 ] | U | VI |
* + - + - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + - - - - + - - - - - - - - +
*
* Pluto is basically identical , supports fewer physical address bits :
*
* 0 23 51 55 63
* + - + - - - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + - - - - + - - - - - - - - +
* | V | U | PPN [ 39 : 12 ] | U | VI |
* + - + - - - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + - - - - + - - - - - - - - +
*
* V = = Valid Bit ( Most Significant Bit is bit 0 )
* U = = Unused
* PPN = = Physical Page Number
* VI = = Virtual Index ( aka Coherent Index )
*
* LPA instruction output is put into PPN field .
* LCI ( Load Coherence Index ) instruction provides the " VI " bits .
*
* We pre - swap the bytes since PCX - W is Big Endian and the
* IOMMU uses little endian for the pdir .
*/
static void
sba_io_pdir_entry(__le64 *pdir_ptr, space_t sid, unsigned long vba,
unsigned long hint)
{
u64 pa; /* physical address */
register unsigned ci; /* coherent index */
pa = lpa(vba);
pa &= IOVP_MASK;
asm ("lci 0(%1), %0" : "=r" (ci) : "r" (vba));
pa |= (ci >> PAGE_SHIFT) & 0 xff; /* move CI (8 bits) into lowest byte */
pa |= SBA_PDIR_VALID_BIT; /* 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 .
*/
asm_io_fdc(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 2 GB . 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 void
sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
{
u32 iovp = (u32) SBA_IOVP(ioc,iova);
__le64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
#ifdef ASSERT_PDIR_SANITY
/* Assert first pdir entry is set.
* *
* * Even though this is a big - endian machine , the entries
* * in the iopdir are little endian . That ' s why we look at
* * the byte at + 7 instead of at + 0 .
*/
if (0 x80 != (((u8 *) pdir_ptr)[7 ])) {
sba_dump_pdir_entry(ioc,"sba_mark_invalid()" , PDIR_INDEX(iovp));
}
#endif
if (byte_cnt > IOVP_SIZE)
{
#if 0
unsigned long entries_per_cacheline = ioc_needs_fdc ?
L1_CACHE_ALIGN(((unsigned long ) pdir_ptr))
- (unsigned long ) pdir_ptr;
: 262144 ;
#endif
/* set "size" field for PCOM */
iovp |= get_order(byte_cnt) + PAGE_SHIFT;
do {
/* clear I/O Pdir entry "valid" bit first */
((u8 *) pdir_ptr)[7 ] = 0 ;
asm_io_fdc(pdir_ptr);
if (ioc_needs_fdc) {
#if 0
entries_per_cacheline = L1_CACHE_SHIFT - 3 ;
#endif
}
pdir_ptr++;
byte_cnt -= IOVP_SIZE;
} while (byte_cnt > IOVP_SIZE);
} else
iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
/*
* * clear I / O PDIR entry " valid " bit .
* * We have to R / M / W the cacheline regardless how much of the
* * pdir entry that we clobber .
* * The rest of the entry would be useful for debugging if we
* * could dump core on HPMC .
*/
((u8 *) pdir_ptr)[7 ] = 0 ;
asm_io_fdc(pdir_ptr);
WRITE_REG( SBA_IOVA(ioc, iovp, 0 , 0 ), 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 / core - api / dma - api - howto . rst
*/
static int sba_dma_supported( struct device *dev, u64 mask)
{
struct ioc *ioc;
if (dev == NULL) {
printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n" );
BUG();
return (0 );
}
ioc = GET_IOC(dev);
if (!ioc)
return 0 ;
/*
* check if mask is > = than the current max IO Virt Address
* The max IO Virt address will * always * < 30 bits .
*/
return ((int )(mask >= (ioc->ibase - 1 +
(ioc->pdir_size / sizeof (u64) * IOVP_SIZE) )));
}
/**
* 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 / core - api / dma - api - howto . rst
*/
static dma_addr_t
sba_map_single(struct device *dev, void *addr, size_t size,
enum dma_data_direction direction)
{
struct ioc *ioc;
unsigned long flags;
dma_addr_t iovp;
dma_addr_t offset;
__le64 *pdir_start;
int pide;
ioc = GET_IOC(dev);
if (!ioc)
return DMA_MAPPING_ERROR;
/* 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 SBA_COLLECT_STATS
ioc->msingle_calls++;
ioc->msingle_pages += size >> IOVP_SHIFT;
#endif
pide = sba_alloc_range(ioc, dev, size);
iovp = (dma_addr_t) pide << IOVP_SHIFT;
DBG_RUN("%s() 0x%p -> 0x%lx\n" ,
__func__, addr, (long ) iovp | offset);
pdir_start = &(ioc->pdir_base[pide]);
while (size > 0 ) {
sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long ) addr, 0 );
DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x\n" ,
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++;
}
/* force FDC ops in io_pdir_entry() to be visible to IOMMU */
asm_io_sync();
#ifdef ASSERT_PDIR_SANITY
sba_check_pdir(ioc,"Check after sba_map_single()" );
#endif
spin_unlock_irqrestore(&ioc->res_lock, flags);
/* form complete address */
return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
}
static dma_addr_t
sba_map_page(struct device *dev, struct page *page, unsigned long offset,
size_t size, enum dma_data_direction direction,
unsigned long attrs)
{
return sba_map_single(dev, page_address(page) + offset, size,
direction);
}
/**
* sba_unmap_page - 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 .
* @ attrs : attributes
*
* See Documentation / core - api / dma - api - howto . rst
*/
static void
sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
enum dma_data_direction direction, unsigned long attrs)
{
struct ioc *ioc;
#if DELAYED_RESOURCE_CNT > 0
struct sba_dma_pair *d;
#endif
unsigned long flags;
dma_addr_t offset;
DBG_RUN("%s() iovp 0x%lx/%x\n" , __func__, (long ) iova, size);
ioc = GET_IOC(dev);
if (!ioc) {
WARN_ON(!ioc);
return ;
}
offset = iova & ~IOVP_MASK;
iova ^= offset; /* clear offset bits */
size += offset;
size = ALIGN(size, IOVP_SIZE);
spin_lock_irqsave(&ioc->res_lock, flags);
#ifdef SBA_COLLECT_STATS
ioc->usingle_calls++;
ioc->usingle_pages += size >> IOVP_SHIFT;
#endif
sba_mark_invalid(ioc, iova, size);
#if DELAYED_RESOURCE_CNT > 0
/* Delaying when we re-use a IO Pdir entry reduces the number
* of MMIO reads needed to flush writes to the PCOM register .
*/
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_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_free_range(ioc, iova, size);
/* If fdc's were issued, force fdc's to be visible now */
asm_io_sync();
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 - 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 .
* @ gfp : allocation flags
* @ attrs : attributes
*
* See Documentation / core - api / dma - api - howto . rst
*/
static void *sba_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
{
void *ret;
if (!hwdev) {
/* only support PCI */
*dma_handle = 0 ;
return NULL;
}
ret = (void *) __get_free_pages(gfp, get_order(size));
if (ret) {
memset(ret, 0 , size);
*dma_handle = sba_map_single(hwdev, ret, size, 0 );
}
return ret;
}
/**
* sba_free - 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_handle : IO virtual address of " consistent " buffer .
* @ attrs : attributes
*
* See Documentation / core - api / dma - api - howto . rst
*/
static void
sba_free(struct device *hwdev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
sba_unmap_page(hwdev, dma_handle, size, 0 , 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 0 x80000000UL
#ifdef SBA_COLLECT_STATS
#define IOMMU_MAP_STATS
#endif
#include "iommu-helpers.h"
#ifdef DEBUG_LARGE_SG_ENTRIES
int dump_run_sg = 0 ;
#endif
/**
* 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 .
* @ attrs : attributes
*
* See Documentation / core - api / dma - api - howto . rst
*/
static int
sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
enum dma_data_direction direction, unsigned long attrs)
{
struct ioc *ioc;
int filled = 0 ;
unsigned long flags;
DBG_RUN_SG("%s() START %d entries\n" , __func__, nents);
ioc = GET_IOC(dev);
if (!ioc)
return -EINVAL;
/* Fast path single entry scatterlists. */
if (nents == 1 ) {
sg_dma_address(sglist) = sba_map_single(dev, sg_virt(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 SBA_COLLECT_STATS
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 .
*/
iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range);
/*
* * 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 = iommu_fill_pdir(ioc, sglist, nents, 0 , sba_io_pdir_entry);
/* force FDC ops in io_pdir_entry() to be visible to IOMMU */
asm_io_sync();
#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);
DBG_RUN_SG("%s() DONE %d mappings\n" , __func__, 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 .
* @ attrs : attributes
*
* See Documentation / core - api / dma - api - howto . rst
*/
static void
sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
enum dma_data_direction direction, unsigned long attrs)
{
struct ioc *ioc;
#ifdef ASSERT_PDIR_SANITY
unsigned long flags;
#endif
DBG_RUN_SG("%s() START %d entries, %p,%x\n" ,
__func__, nents, sg_virt(sglist), sglist->length);
ioc = GET_IOC(dev);
if (!ioc) {
WARN_ON(!ioc);
return ;
}
#ifdef SBA_COLLECT_STATS
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 (nents && sg_dma_len(sglist)) {
sba_unmap_page(dev, sg_dma_address(sglist), sg_dma_len(sglist),
direction, 0 );
#ifdef SBA_COLLECT_STATS
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;
nents--;
}
DBG_RUN_SG("%s() DONE (nents %d)\n" , __func__, 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 const struct dma_map_ops sba_ops = {
.dma_supported = sba_dma_supported,
.alloc = sba_alloc,
.free = sba_free,
.map_page = sba_map_page,
.unmap_page = sba_unmap_page,
.map_sg = sba_map_sg,
.unmap_sg = sba_unmap_sg,
.get_sgtable = dma_common_get_sgtable,
.alloc_pages_op = dma_common_alloc_pages,
.free_pages = dma_common_free_pages,
};
/**************************************************************************
* *
* * 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 0 x00160000UL /* bit 17,18,20 */
#define PIRANHA_ADDR_VAL 0 x00060000UL /* 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("%s() could not allocate I/O Page Table\n" ,
__func__);
}
/* 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 ) & 0 x7f) != 0 x13
|| (boot_cpu_data.pdc.versions > 0 x202)
|| (boot_cpu_data.pdc.capabilities & 0 x08L) )
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 2 MB , by cleverly allocating the
* right physical address , we can either avoid ( IOPDIR < = 1 MB )
* or minimize ( 2 MB IO Pdir ) the problem if we restrict the
* IO Pdir to a maximum size of 2 MB - 128 K ( 1902 K ) .
*
* Because we always allocate 2 ^ N sized IO pdirs , either of the
* " bad " regions will be the last 128 K 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 {
/*
* * 1 MB or 2 MB Pdir
* * Needs to be aligned on an " odd " 1 MB 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 )) {
/*
* * 2 MB Pdir .
* *
* * Flag tells init_bitmap ( ) to mark bad 128 k as used
* * and to reduce the size by 128 k .
*/
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;
}
struct ibase_data_struct {
struct ioc *ioc;
int ioc_num;
};
static int setup_ibase_imask_callback(struct device *dev, void *data)
{
struct parisc_device *lba = to_parisc_device(dev);
struct ibase_data_struct *ibd = data;
int rope_num = (lba->hpa.start >> 13 ) & 0 xf;
if (rope_num >> 3 == ibd->ioc_num)
lba_set_iregs(lba, ibd->ioc->ibase, ibd->ioc->imask);
return 0 ;
}
/* setup Mercury or Elroy IBASE/IMASK registers. */
static void
setup_ibase_imask(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
{
struct ibase_data_struct ibase_data = {
.ioc = ioc,
.ioc_num = ioc_num,
};
device_for_each_child(&sba->dev, &ibase_data,
setup_ibase_imask_callback);
}
#ifdef SBA_AGP_SUPPORT
static int
sba_ioc_find_quicksilver(struct device *dev, void *data)
{
int *agp_found = data;
struct parisc_device *lba = to_parisc_device(dev);
if (IS_QUICKSILVER(lba))
*agp_found = 1 ;
return 0 ;
}
#endif
static void
sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
{
u32 iova_space_mask;
u32 iova_space_size;
int iov_order, tcnfg;
#ifdef SBA_AGP_SUPPORT
int agp_found = 0 ;
#endif
/*
* * Firmware programs the base and size of a " safe IOVA space "
* * ( one that doesn ' t overlap memory or LMMIO space ) in the
* * IBASE and IMASK registers .
*/
ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE) & ~0 x1fffffULL;
iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0 xFFFFFFFFUL) + 1 ;
if ((ioc->ibase < 0 xfed00000UL) && ((ioc->ibase + iova_space_size) > 0 xfee00000UL)) {
printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n" );
iova_space_size /= 2 ;
}
/*
* * iov_order is always based on a 1 GB IOVA space since we want to
* * turn on the other half for AGP GART .
*/
iov_order = get_order(iova_space_size >> (IOVP_SHIFT - PAGE_SHIFT));
ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof (u64);
DBG_INIT("%s() hpa 0x%p IOV %dMB (%d bits)\n" ,
__func__, ioc->ioc_hpa, iova_space_size >> 20 ,
iov_order + PAGE_SHIFT);
ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
get_order(ioc->pdir_size));
if (!ioc->pdir_base)
panic("Couldn't allocate I/O Page Table\n" );
memset(ioc->pdir_base, 0 , ioc->pdir_size);
DBG_INIT("%s() pdir %p size %x\n" ,
__func__, ioc->pdir_base, ioc->pdir_size);
#ifdef SBA_HINT_SUPPORT
ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
ioc->hint_mask_pdir = ~(0 x3 << (iov_order + PAGE_SHIFT));
DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n" ,
ioc->hint_shift_pdir, ioc->hint_mask_pdir);
#endif
WARN_ON((((unsigned long ) ioc->pdir_base) & PAGE_MASK) != (unsigned long ) ioc->pdir_base);
WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
/* build IMASK for IOC and Elroy */
iova_space_mask = 0 xffffffff;
iova_space_mask <<= (iov_order + PAGE_SHIFT);
ioc->imask = iova_space_mask;
#ifdef ZX1_SUPPORT
ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1 );
#endif
sba_dump_tlb(ioc->ioc_hpa);
setup_ibase_imask(sba, ioc, ioc_num);
WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);
#ifdef CONFIG_64BIT
/*
* * Setting the upper bits makes checking for bypass addresses
* * a little faster later on .
*/
ioc->imask |= 0 xFFFFFFFF00000000UL;
#endif
/* Set I/O PDIR Page size to system page size */
switch (PAGE_SHIFT) {
case 12 : tcnfg = 0 ; break ; /* 4K */
case 13 : tcnfg = 1 ; break ; /* 8K */
case 14 : tcnfg = 2 ; break ; /* 16K */
case 16 : tcnfg = 3 ; break ; /* 64K */
default :
panic(__FILE__ "Unsupported system page size %d" ,
1 << PAGE_SHIFT);
break ;
}
WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
/*
* * Program the IOC ' s ibase and enable IOVA translation
* * Bit zero = = enable bit .
*/
WRITE_REG(ioc->ibase | 1 , ioc->ioc_hpa + IOC_IBASE);
/*
* * Clear I / O TLB of any possible entries .
* * ( Yes . This is a bit paranoid . . . but so what )
*/
WRITE_REG(ioc->ibase | 31 , ioc->ioc_hpa + IOC_PCOM);
#ifdef SBA_AGP_SUPPORT
/*
* * If an AGP device is present , only use half of the IOV space
* * for PCI DMA . Unfortunately we can ' t know ahead of time
* * whether GART support will actually be used , for now we
* * can just key on any AGP device found in the system .
* * We program the next pdir index after we stop w / a key for
* * the GART code to handshake on .
*/
device_for_each_child(&sba->dev, &agp_found, sba_ioc_find_quicksilver);
if (agp_found && sba_reserve_agpgart) {
printk(KERN_INFO "%s: reserving %dMb of IOVA space for agpgart\n" ,
__func__, (iova_space_size/2 ) >> 20 );
ioc->pdir_size /= 2 ;
ioc->pdir_base[PDIR_INDEX(iova_space_size/2 )] = SBA_AGPGART_COOKIE;
}
#endif /*SBA_AGP_SUPPORT*/
}
static void
sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
{
u32 iova_space_size, iova_space_mask;
unsigned int pdir_size, iov_order, tcnfg;
/*
* * 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 .
*/
iova_space_size = (u32) (totalram_pages()/global_ioc_cnt);
/* limit IOVA space size to 1MB-1GB */
if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
iova_space_size = 1 << (20 - PAGE_SHIFT);
}
else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
iova_space_size = 1 << (30 - PAGE_SHIFT);
}
/*
* * iova space must be log2 ( ) in size .
* * thus , pdir / res_map will also be log2 ( ) .
* * PIRANHA BUG : Exception is when IO Pdir is 2 MB ( gets reduced )
*/
iov_order = get_order(iova_space_size << PAGE_SHIFT);
/* iova_space_size is now bytes, not pages */
iova_space_size = 1 << (iov_order + PAGE_SHIFT);
ioc->pdir_size = pdir_size = (iova_space_size/IOVP_SIZE) * sizeof (u64);
DBG_INIT("%s() hpa %px mem %ldMB IOV %dMB (%d bits)\n" ,
__func__,
ioc->ioc_hpa,
(unsigned long ) totalram_pages() >> (20 - PAGE_SHIFT),
iova_space_size>>20 ,
iov_order + PAGE_SHIFT);
ioc->pdir_base = sba_alloc_pdir(pdir_size);
DBG_INIT("%s() pdir %p size %x\n" ,
__func__, ioc->pdir_base, pdir_size);
#ifdef SBA_HINT_SUPPORT
/* FIXME : DMA HINTs not used */
ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
ioc->hint_mask_pdir = ~(0 x3 << (iov_order + PAGE_SHIFT));
DBG_INIT(" hint_shift_pdir %x hint_mask_pdir %lx\n" ,
ioc->hint_shift_pdir, ioc->hint_mask_pdir);
#endif
WRITE_REG64(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
/* build IMASK for IOC and Elroy */
iova_space_mask = 0 xffffffff;
iova_space_mask <<= (iov_order + PAGE_SHIFT);
/*
* * On C3000 w / 512 MB mem , HP - UX 10 . 20 reports :
* * ibase = 0 , imask = 0 xFE000000 , size = 0 x2000000 .
*/
ioc->ibase = 0 ;
ioc->imask = iova_space_mask; /* save it */
#ifdef ZX1_SUPPORT
ioc->iovp_mask = ~(iova_space_mask + PAGE_SIZE - 1 );
#endif
DBG_INIT("%s() IOV base %#lx mask %#0lx\n" ,
__func__, 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_ibase_imask(sba, ioc, ioc_num);
/*
* * Program the IOC ' s ibase and enable IOVA translation
*/
WRITE_REG(ioc->ibase | 1 , ioc->ioc_hpa+IOC_IBASE);
WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
/* Set I/O PDIR Page size to system page size */
switch (PAGE_SHIFT) {
case 12 : tcnfg = 0 ; break ; /* 4K */
case 13 : tcnfg = 1 ; break ; /* 8K */
case 14 : tcnfg = 2 ; break ; /* 16K */
case 16 : tcnfg = 3 ; break ; /* 64K */
default :
panic(__FILE__ "Unsupported system page size %d" ,
1 << PAGE_SHIFT);
break ;
}
/* Set I/O PDIR Page size to PAGE_SIZE (4k/16k/...) */
WRITE_REG(tcnfg, 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);
ioc->ibase = 0 ; /* used by SBA_IOVA and related macros */
DBG_INIT("%s() DONE\n" , __func__);
}
/**************************************************************************
* *
* * 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 __iomem *ioc_remap(struct sba_device *sba_dev, unsigned int offset)
{
return ioremap(sba_dev->dev->hpa.start + offset, SBA_FUNC_SIZE);
}
static void sba_hw_init(struct sba_device *sba_dev)
{
int i;
int num_ioc;
u64 ioc_ctl;
if (!is_pdc_pat()) {
/* Shutdown the USB controller on Astro-based workstations.
* * Once we reprogram the IOMMU , the next DMA performed by
* * USB will HPMC the box . USB is only enabled if a
* * keyboard is present and found .
* *
* * With serial console , j6k v5 . 0 firmware says :
* * mem_kbd hpa 0 xfee003f8 sba 0 x0 pad 0 x0 cl_class 0 x7
* *
* * FIXME : Using GFX + USB console at power up but direct
* * linux to serial console is still broken .
* * USB could generate DMA so we must reset USB .
* * The proper sequence would be :
* * o block console output
* * o reset USB device
* * o reprogram serial port
* * o unblock console output
*/
if (PAGE0->mem_kbd.cl_class == CL_KEYBD) {
pdc_io_reset_devices();
}
}
#if 0
printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n" , PAGE0->mem_boot.hpa,
PAGE0->mem_boot.spa, PAGE0->mem_boot.pad, PAGE0->mem_boot.cl_class);
/*
* * Need to deal with DMA from LAN .
* * Maybe use page zero boot device as a handle to talk
* * to PDC about which device to shutdown .
* *
* * Netbooting , j6k v5 . 0 firmware says :
* * mem_boot hpa 0 xf4008000 sba 0 x0 pad 0 x0 cl_class 0 x1002
* * ARGH ! invalid class .
*/
if ((PAGE0->mem_boot.cl_class != CL_RANDOM)
&& (PAGE0->mem_boot.cl_class != CL_SEQU)) {
pdc_io_reset();
}
#endif
if (!IS_PLUTO(sba_dev->dev)) {
ioc_ctl = READ_REG(sba_dev->sba_hpa+IOC_CTRL);
DBG_INIT("%s() hpa %px ioc_ctl 0x%Lx ->" ,
__func__, sba_dev->sba_hpa, ioc_ctl);
ioc_ctl &= ~(IOC_CTRL_RM | IOC_CTRL_NC | IOC_CTRL_CE);
ioc_ctl |= IOC_CTRL_DD | IOC_CTRL_D4 | IOC_CTRL_TC;
/* j6700 v1.6 firmware sets 0x294f */
/* A500 firmware sets 0x4d */
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%Lx\n" , ioc_ctl);
#endif
} /* if !PLUTO */
if (IS_ASTRO(sba_dev->dev)) {
int err;
sba_dev->ioc[0 ].ioc_hpa = ioc_remap(sba_dev, ASTRO_IOC_OFFSET);
num_ioc = 1 ;
sba_dev->chip_resv.name = "Astro Intr Ack" ;
sba_dev->chip_resv.start = PCI_F_EXTEND | 0 xfef00000UL;
sba_dev->chip_resv.end = PCI_F_EXTEND | (0 xff000000UL - 1 ) ;
err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
BUG_ON(err < 0 );
} else if (IS_PLUTO(sba_dev->dev)) {
int err;
sba_dev->ioc[0 ].ioc_hpa = ioc_remap(sba_dev, PLUTO_IOC_OFFSET);
num_ioc = 1 ;
sba_dev->chip_resv.name = "Pluto Intr/PIOP/VGA" ;
sba_dev->chip_resv.start = PCI_F_EXTEND | 0 xfee00000UL;
sba_dev->chip_resv.end = PCI_F_EXTEND | (0 xff200000UL - 1 );
err = request_resource(&iomem_resource, &(sba_dev->chip_resv));
WARN_ON(err < 0 );
sba_dev->iommu_resv.name = "IOVA Space" ;
sba_dev->iommu_resv.start = 0 x40000000UL;
sba_dev->iommu_resv.end = 0 x50000000UL - 1 ;
err = request_resource(&iomem_resource, &(sba_dev->iommu_resv));
WARN_ON(err < 0 );
} else {
/* IKE, REO */
sba_dev->ioc[0 ].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(0 ));
sba_dev->ioc[1 ].ioc_hpa = ioc_remap(sba_dev, IKE_IOC_OFFSET(1 ));
num_ioc = 2 ;
/* TODO - LOOKUP Ike/Stretch chipset mem map */
}
/* XXX: What about Reo Grande? */
sba_dev->num_ioc = num_ioc;
for (i = 0 ; i < num_ioc; i++) {
void __iomem *ioc_hpa = sba_dev->ioc[i].ioc_hpa;
unsigned int j;
for (j=0 ; j < sizeof (u64) * ROPES_PER_IOC; j+=sizeof (u64)) {
/*
* Clear ROPE ( N ) _ CONFIG AO bit .
* Disables " NT Ordering " ( ~ = ! " Relaxed Ordering " )
* Overrides bit 1 in DMA Hint Sets .
* Improves netperf UDP_STREAM by ~ 10 % for bcm5701 .
*/
if (IS_PLUTO(sba_dev->dev)) {
void __iomem *rope_cfg;
unsigned long cfg_val;
rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
cfg_val = READ_REG(rope_cfg);
cfg_val &= ~IOC_ROPE_AO;
WRITE_REG(cfg_val, rope_cfg);
}
/*
* * Make sure the box crashes on rope errors .
*/
WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
}
/* flush out the last writes */
READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
DBG_INIT(" ioc[%d] ROPE_CFG %#lx ROPE_DBG %lx\n" ,
i,
(unsigned long ) READ_REG(sba_dev->ioc[i].ioc_hpa + 0 x40),
(unsigned long ) READ_REG(sba_dev->ioc[i].ioc_hpa + 0 x50)
);
DBG_INIT(" STATUS_CONTROL %#lx FLUSH_CTRL %#lx\n" ,
(unsigned long ) READ_REG(sba_dev->ioc[i].ioc_hpa + 0 x108),
(unsigned long ) READ_REG(sba_dev->ioc[i].ioc_hpa + 0 x400)
);
if (IS_PLUTO(sba_dev->dev)) {
sba_ioc_init_pluto(sba_dev->dev, &(sba_dev->ioc[i]), i);
} else {
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%x\n" ,
__func__, 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("%s:%s() could not allocate resource map\n" ,
__FILE__, __func__ );
}
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 ] = 0 x80;
sba_dev->ioc[i].pdir_base[0 ] = (__force __le64) 0 xeeffc0addbba0080ULL;
#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 %p\n" ,
__func__, i, res_size, sba_dev->ioc[i].res_map);
}
spin_lock_init(&sba_dev->sba_lock);
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 (ioc_needs_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(struct seq_file *m, void *p)
{
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 */
#ifdef SBA_COLLECT_STATS
unsigned long avg = 0 , min, max;
#endif
int i;
seq_printf(m, "%s rev %d.%d\n" ,
sba_dev->name,
(sba_dev->hw_rev & 0 x7) + 1 ,
(sba_dev->hw_rev & 0 x18) >> 3 );
seq_printf(m, "IO PDIR size : %d bytes (%d entries)\n" ,
(int )((ioc->res_size << 3 ) * sizeof (u64)), /* 8 bits/byte */
total_pages);
seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n" ,
ioc->res_size, ioc->res_size << 3 ); /* 8 bits per byte */
seq_printf(m, "LMMIO_BASE/MASK/ROUTE %08x %08x %08x\n" ,
READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_BASE),
READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_MASK),
READ_REG32(sba_dev->sba_hpa + LMMIO_DIST_ROUTE));
for (i=0 ; i<4 ; i++)
seq_printf(m, "DIR%d_BASE/MASK/ROUTE %08x %08x %08x\n" ,
i,
READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_BASE + i*0 x18),
READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK + i*0 x18),
READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0 x18));
#ifdef SBA_COLLECT_STATS
seq_printf(m, "IO PDIR entries : %ld free %ld used (%d%%)\n" ,
total_pages - ioc->used_pages, ioc->used_pages,
(int )(ioc->used_pages * 100 / total_pages));
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;
seq_printf(m, " Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n" ,
min, avg, max);
seq_printf(m, "pci_map_single(): %12ld calls %12ld pages (avg %d/1000)\n" ,
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;
seq_printf(m, "pci_unmap_single: %12ld calls %12ld pages (avg %d/1000)\n" ,
min, max, (int )((max * 1000 )/min));
seq_printf(m, "pci_map_sg() : %12ld calls %12ld pages (avg %d/1000)\n" ,
ioc->msg_calls, ioc->msg_pages,
(int )((ioc->msg_pages * 1000 )/ioc->msg_calls));
seq_printf(m, "pci_unmap_sg() : %12ld calls %12ld pages (avg %d/1000)\n" ,
ioc->usg_calls, ioc->usg_pages,
(int )((ioc->usg_pages * 1000 )/ioc->usg_calls));
#endif
return 0 ;
}
static int
sba_proc_bitmap_info(struct seq_file *m, void *p)
{
struct sba_device *sba_dev = sba_list;
struct ioc *ioc = &sba_dev->ioc[0 ]; /* FIXME: Multi-IOC support! */
seq_hex_dump(m, " " , DUMP_PREFIX_NONE, 32 , 4 , ioc->res_map,
ioc->res_size, false );
seq_putc(m, '\n' );
return 0 ;
}
#endif /* CONFIG_PROC_FS */
static const struct parisc_device_id sba_tbl[] __initconst = {
{ HPHW_IOA, HVERSION_REV_ANY_ID, ASTRO_RUNWAY_PORT, 0 xb },
{ HPHW_BCPORT, HVERSION_REV_ANY_ID, IKE_MERCED_PORT, 0 xc },
{ HPHW_BCPORT, HVERSION_REV_ANY_ID, REO_MERCED_PORT, 0 xc },
{ HPHW_BCPORT, HVERSION_REV_ANY_ID, REOG_MERCED_PORT, 0 xc },
{ HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0 xc },
{ 0 , }
};
static int sba_driver_callback(struct parisc_device *);
static struct parisc_driver sba_driver __refdata = {
.name = MODULE_NAME,
.id_table = sba_tbl,
.probe = sba_driver_callback,
};
/*
* * Determine if sba 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 .
*/
static int __init sba_driver_callback(struct parisc_device *dev)
{
struct sba_device *sba_dev;
u32 func_class;
int i;
char *version;
void __iomem *sba_addr = ioremap(dev->hpa.start, SBA_FUNC_SIZE);
struct proc_dir_entry *root __maybe_unused;
sba_dump_ranges(sba_addr);
/* Read HW Rev First */
func_class = READ_REG(sba_addr + SBA_FCLASS);
if (IS_ASTRO(dev)) {
unsigned long fclass;
static char astro_rev[]="Astro ?.?" ;
/* Astro is broken...Read HW Rev First */
fclass = READ_REG(sba_addr);
astro_rev[6 ] = '1' + (char ) (fclass & 0 x7);
astro_rev[8 ] = '0' + (char ) ((fclass & 0 x18) >> 3 );
version = astro_rev;
} else if (IS_IKE(dev)) {
static char ike_rev[] = "Ike rev ?" ;
ike_rev[8 ] = '0' + (char ) (func_class & 0 xff);
version = ike_rev;
} else if (IS_PLUTO(dev)) {
static char pluto_rev[]="Pluto ?.?" ;
pluto_rev[6 ] = '0' + (char ) ((func_class & 0 xf0) >> 4 );
pluto_rev[8 ] = '0' + (char ) (func_class & 0 x0f);
version = pluto_rev;
} else {
static char reo_rev[] = "REO rev ?" ;
reo_rev[8 ] = '0' + (char ) (func_class & 0 xff);
version = reo_rev;
}
if (!global_ioc_cnt) {
global_ioc_cnt = count_parisc_driver(&sba_driver);
/* Astro and Pluto have one IOC per SBA */
if ((!IS_ASTRO(dev)) || (!IS_PLUTO(dev)))
global_ioc_cnt *= 2 ;
}
printk(KERN_INFO "%s found %s at 0x%llx\n" ,
MODULE_NAME, version, (unsigned long long )dev->hpa.start);
sba_dev = kzalloc(sizeof (struct sba_device), GFP_KERNEL);
if (!sba_dev) {
printk(KERN_ERR MODULE_NAME " - couldn't alloc sba_device\n" );
return -ENOMEM;
}
parisc_set_drvdata(dev, sba_dev);
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->name = dev->name;
sba_dev->sba_hpa = sba_addr;
sba_get_pat_resources(sba_dev);
sba_hw_init(sba_dev);
sba_common_init(sba_dev);
hppa_dma_ops = &sba_ops;
switch (dev->id.hversion) {
case PLUTO_MCKINLEY_PORT:
if (!proc_mckinley_root)
proc_mckinley_root = proc_mkdir("bus/mckinley" , NULL);
root = proc_mckinley_root;
break ;
case ASTRO_RUNWAY_PORT:
case IKE_MERCED_PORT:
default :
if (!proc_runway_root)
proc_runway_root = proc_mkdir("bus/runway" , NULL);
root = proc_runway_root;
break ;
}
proc_create_single("sba_iommu" , 0 , root, sba_proc_info);
proc_create_single("sba_iommu-bitmap" , 0 , root, sba_proc_bitmap_info);
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 ( ) .
*/
static int __init sba_init(void )
{
return register_parisc_driver(&sba_driver);
}
arch_initcall(sba_init);
/**
* sba_get_iommu - Assign the iommu pointer for the pci bus controller .
* @ pci_hba : The parisc device .
*
* Returns the appropriate IOMMU data for the given parisc PCI controller .
* This is cached and used later for PCI DMA Mapping .
*/
void * sba_get_iommu(struct parisc_device *pci_hba)
{
struct parisc_device *sba_dev = parisc_parent(pci_hba);
struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
char t = sba_dev->id.hw_type;
int iocnum = (pci_hba->hw_path >> 3 ); /* IOC # */
WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT));
return &(sba->ioc[iocnum]);
}
/**
* sba_directed_lmmio - return first directed LMMIO range routed to rope
* @ pci_hba : The parisc device .
* @ r : resource PCI host controller wants start / end fields assigned .
*
* For the given parisc PCI controller , determine if any direct ranges
* are routed down the corresponding rope .
*/
void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
{
struct parisc_device *sba_dev = parisc_parent(pci_hba);
struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
char t = sba_dev->id.hw_type;
int i;
int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1 )); /* rope # */
BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
r->start = r->end = 0 ;
/* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
for (i=0 ; i<4 ; i++) {
int base, size;
void __iomem *reg = sba->sba_hpa + i*0 x18;
base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
if ((base & 1 ) == 0 )
continue ; /* not enabled */
size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);
if ((size & (ROPES_PER_IOC-1 )) != rope)
continue ; /* directed down different rope */
r->start = (base & ~1 UL) | PCI_F_EXTEND;
size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
r->end = r->start + size;
r->flags = IORESOURCE_MEM;
}
}
/**
* sba_distributed_lmmio - return portion of distributed LMMIO range
* @ pci_hba : The parisc device .
* @ r : resource PCI host controller wants start / end fields assigned .
*
* For the given parisc PCI controller , return portion of distributed LMMIO
* range . The distributed LMMIO is always present and it ' s just a question
* of the base address and size of the range .
*/
void sba_distributed_lmmio(struct parisc_device *pci_hba, struct resource *r )
{
struct parisc_device *sba_dev = parisc_parent(pci_hba);
struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
char t = sba_dev->id.hw_type;
int base, size;
int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1 )); /* rope # */
BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));
r->start = r->end = 0 ;
base = READ_REG32(sba->sba_hpa + LMMIO_DIST_BASE);
if ((base & 1 ) == 0 ) {
BUG(); /* Gah! Distr Range wasn't enabled! */
return ;
}
r->start = (base & ~1 UL) | PCI_F_EXTEND;
size = (~READ_REG32(sba->sba_hpa + LMMIO_DIST_MASK)) / ROPES_PER_IOC;
r->start += rope * (size + 1 ); /* adjust base for this rope */
r->end = r->start + size;
r->flags = IORESOURCE_MEM;
}
Messung V0.5 in Prozent C=92 H=91 G=91
¤ Dauer der Verarbeitung: 0.27 Sekunden
(vorverarbeitet am 2026-09-28)
¤
*© Formatika GbR, Deutschland
2026-10-10
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