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Diffstat (limited to 'drivers/parisc/sba_iommu.c')
| -rw-r--r-- | drivers/parisc/sba_iommu.c | 2082 |
1 files changed, 2082 insertions, 0 deletions
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c new file mode 100644 index 000000000..228c58060 --- /dev/null +++ b/drivers/parisc/sba_iommu.c @@ -0,0 +1,2082 @@ +// 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> + +#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/mckinley.h> /* for proc_mckinley_root */ +#include <asm/runway.h> /* for proc_runway_root */ +#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 SBA_INLINE __inline__ + +#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 + + +/************************************ +** 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 */ + 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%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) & 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/%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) (~0UL << (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. + * @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, 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 = ~0UL, 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. + * @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(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/%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 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 %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_INLINE +sba_io_pdir_entry(u64 *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) & 0xff; /* 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 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); + u64 *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 (0x80 != (((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; + u64 *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. + * + * 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. + * + * 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_handler: IO virtual address of "consistent" buffer. + * + * 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 0x80000000UL + +#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. + * + * 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 coalesced, filled = 0; + unsigned long flags; + + DBG_RUN_SG("%s() START %d entries\n", __func__, nents); + + ioc = GET_IOC(dev); + if (!ioc) + return 0; + + /* 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. + */ + coalesced = 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. + * + * 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 = 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 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("%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) & 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; +} + +struct ibase_data_struct { + struct ioc *ioc; + int ioc_num; +}; + +static int setup_ibase_imask_callback(struct device *dev, void *data) +{ + /* lba_set_iregs() is in drivers/parisc/lba_pci.c */ + extern void lba_set_iregs(struct parisc_device *, u32, u32); + struct parisc_device *lba = to_parisc_device(dev); + struct ibase_data_struct *ibd = data; + int rope_num = (lba->hpa.start >> 13) & 0xf; + 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) & ~0x1fffffULL; + iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1; + + if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) { + printk("WARNING: IOV space overlaps local config and interrupt message, truncating\n"); + iova_space_size /= 2; + } + + /* + ** iov_order is always based on a 1GB 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 = ~(0x3 << (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 = 0xffffffff; + 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 |= 0xFFFFFFFF00000000UL; +#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 2MB (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 0x%lx 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 = ~(0x3 << (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 = 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 = 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 0x%lx mask 0x%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 0xfee003f8 sba 0x0 pad 0x0 cl_class 0x7 + ** + ** 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 0xf4008000 sba 0x0 pad 0x0 cl_class 0x1002 + ** 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 0x%lx 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 | 0xfef00000UL; + sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff000000UL - 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 | 0xfee00000UL; + sba_dev->chip_resv.end = PCI_F_EXTEND | (0xff200000UL - 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 = 0x40000000UL; + sba_dev->iommu_resv.end = 0x50000000UL - 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 0x%Lx ROPE_DBG 0x%Lx\n", + i, + READ_REG(sba_dev->ioc[i].ioc_hpa + 0x40), + READ_REG(sba_dev->ioc[i].ioc_hpa + 0x50) + ); + DBG_INIT(" STATUS_CONTROL 0x%Lx FLUSH_CTRL 0x%Lx\n", + READ_REG(sba_dev->ioc[i].ioc_hpa + 0x108), + READ_REG(sba_dev->ioc[i].ioc_hpa + 0x400) + ); + + 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] = 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 %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 & 0x7) + 1, + (sba_dev->hw_rev & 0x18) >> 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*0x18), + READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_MASK + i*0x18), + READ_REG32(sba_dev->sba_hpa + LMMIO_DIRECT0_ROUTE + i*0x18)); + +#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, 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 }, + { HPHW_IOA, HVERSION_REV_ANY_ID, PLUTO_MCKINLEY_PORT, 0xc }, + { 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); +#ifdef CONFIG_PROC_FS + struct proc_dir_entry *root; +#endif + + 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 & 0x7); + astro_rev[8] = '0' + (char) ((fclass & 0x18) >> 3); + version = astro_rev; + + } else if (IS_IKE(dev)) { + static char ike_rev[] = "Ike rev ?"; + ike_rev[8] = '0' + (char) (func_class & 0xff); + version = ike_rev; + } else if (IS_PLUTO(dev)) { + static char pluto_rev[]="Pluto ?.?"; + pluto_rev[6] = '0' + (char) ((func_class & 0xf0) >> 4); + pluto_rev[8] = '0' + (char) (func_class & 0x0f); + version = pluto_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); + + /* 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; + +#ifdef CONFIG_PROC_FS + switch (dev->id.hversion) { + case PLUTO_MCKINLEY_PORT: + root = proc_mckinley_root; + break; + case ASTRO_RUNWAY_PORT: + case IKE_MERCED_PORT: + default: + 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); +#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. + * + * 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); /* rope # */ + + WARN_ON((t != HPHW_IOA) && (t != HPHW_BCPORT)); + + return &(sba->ioc[iocnum]); +} + + +/** + * sba_directed_lmmio - return first directed LMMIO range routed to rope + * @pa_dev: 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*0x18; + + 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 & ~1UL) | 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 + * @pa_dev: 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 & ~1UL) | 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; +} |