/* iommu.h: Definitions for the sun4m IOMMU. * * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) */ #ifndef _SPARC_IOMMU_H #define _SPARC_IOMMU_H #include <asm/page.h> #include <asm/bitext.h> /* The iommu handles all virtual to physical address translations * that occur between the SBUS and physical memory. Access by * the cpu to IO registers and similar go over the mbus so are * translated by the on chip SRMMU. The iommu and the srmmu do * not need to have the same translations at all, in fact most * of the time the translations they handle are a disjunct set. * Basically the iommu handles all dvma sbus activity. */ /* The IOMMU registers occupy three pages in IO space. */ struct iommu_regs { /* First page */ volatile unsigned long control; /* IOMMU control */ volatile unsigned long base; /* Physical base of iopte page table */ volatile unsigned long _unused1[3]; volatile unsigned long tlbflush; /* write only */ volatile unsigned long pageflush; /* write only */ volatile unsigned long _unused2[1017]; /* Second page */ volatile unsigned long afsr; /* Async-fault status register */ volatile unsigned long afar; /* Async-fault physical address */ volatile unsigned long _unused3[2]; volatile unsigned long sbuscfg0; /* SBUS configuration registers, per-slot */ volatile unsigned long sbuscfg1; volatile unsigned long sbuscfg2; volatile unsigned long sbuscfg3; volatile unsigned long mfsr; /* Memory-fault status register */ volatile unsigned long mfar; /* Memory-fault physical address */ volatile unsigned long _unused4[1014]; /* Third page */ volatile unsigned long mid; /* IOMMU module-id */ }; #define IOMMU_CTRL_IMPL 0xf0000000 /* Implementation */ #define IOMMU_CTRL_VERS 0x0f000000 /* Version */ #define IOMMU_CTRL_RNGE 0x0000001c /* Mapping RANGE */ #define IOMMU_RNGE_16MB 0x00000000 /* 0xff000000 -> 0xffffffff */ #define IOMMU_RNGE_32MB 0x00000004 /* 0xfe000000 -> 0xffffffff */ #define IOMMU_RNGE_64MB 0x00000008 /* 0xfc000000 -> 0xffffffff */ #define IOMMU_RNGE_128MB 0x0000000c /* 0xf8000000 -> 0xffffffff */ #define IOMMU_RNGE_256MB 0x00000010 /* 0xf0000000 -> 0xffffffff */ #define IOMMU_RNGE_512MB 0x00000014 /* 0xe0000000 -> 0xffffffff */ #define IOMMU_RNGE_1GB 0x00000018 /* 0xc0000000 -> 0xffffffff */ #define IOMMU_RNGE_2GB 0x0000001c /* 0x80000000 -> 0xffffffff */ #define IOMMU_CTRL_ENAB 0x00000001 /* IOMMU Enable */ #define IOMMU_AFSR_ERR 0x80000000 /* LE, TO, or BE asserted */ #define IOMMU_AFSR_LE 0x40000000 /* SBUS reports error after transaction */ #define IOMMU_AFSR_TO 0x20000000 /* Write access took more than 12.8 us. */ #define IOMMU_AFSR_BE 0x10000000 /* Write access received error acknowledge */ #define IOMMU_AFSR_SIZE 0x0e000000 /* Size of transaction causing error */ #define IOMMU_AFSR_S 0x01000000 /* Sparc was in supervisor mode */ #define IOMMU_AFSR_RESV 0x00f00000 /* Reserver, forced to 0x8 by hardware */ #define IOMMU_AFSR_ME 0x00080000 /* Multiple errors occurred */ #define IOMMU_AFSR_RD 0x00040000 /* A read operation was in progress */ #define IOMMU_AFSR_FAV 0x00020000 /* IOMMU afar has valid contents */ #define IOMMU_SBCFG_SAB30 0x00010000 /* Phys-address bit 30 when bypass enabled */ #define IOMMU_SBCFG_BA16 0x00000004 /* Slave supports 16 byte bursts */ #define IOMMU_SBCFG_BA8 0x00000002 /* Slave supports 8 byte bursts */ #define IOMMU_SBCFG_BYPASS 0x00000001 /* Bypass IOMMU, treat all addresses produced by this device as pure physical. */ #define IOMMU_MFSR_ERR 0x80000000 /* One or more of PERR1 or PERR0 */ #define IOMMU_MFSR_S 0x01000000 /* Sparc was in supervisor mode */ #define IOMMU_MFSR_CPU 0x00800000 /* CPU transaction caused parity error */ #define IOMMU_MFSR_ME 0x00080000 /* Multiple parity errors occurred */ #define IOMMU_MFSR_PERR 0x00006000 /* high bit indicates parity error occurred on the even word of the access, low bit indicated odd word caused the parity error */ #define IOMMU_MFSR_BM 0x00001000 /* Error occurred while in boot mode */ #define IOMMU_MFSR_C 0x00000800 /* Address causing error was marked cacheable */ #define IOMMU_MFSR_RTYP 0x000000f0 /* Memory request transaction type */ #define IOMMU_MID_SBAE 0x001f0000 /* SBus arbitration enable */ #define IOMMU_MID_SE 0x00100000 /* Enables SCSI/ETHERNET arbitration */ #define IOMMU_MID_SB3 0x00080000 /* Enable SBUS device 3 arbitration */ #define IOMMU_MID_SB2 0x00040000 /* Enable SBUS device 2 arbitration */ #define IOMMU_MID_SB1 0x00020000 /* Enable SBUS device 1 arbitration */ #define IOMMU_MID_SB0 0x00010000 /* Enable SBUS device 0 arbitration */ #define IOMMU_MID_MID 0x0000000f /* Module-id, hardcoded to 0x8 */ /* The format of an iopte in the page tables */ #define IOPTE_PAGE 0x07ffff00 /* Physical page number (PA[30:12]) */ #define IOPTE_CACHE 0x00000080 /* Cached (in vme IOCACHE or Viking/MXCC) */ #define IOPTE_WRITE 0x00000004 /* Writeable */ #define IOPTE_VALID 0x00000002 /* IOPTE is valid */ #define IOPTE_WAZ 0x00000001 /* Write as zeros */ struct iommu_struct { struct iommu_regs *regs; iopte_t *page_table; /* For convenience */ unsigned long start; /* First managed virtual address */ unsigned long end; /* Last managed virtual address */ struct bit_map usemap; }; static inline void iommu_invalidate(struct iommu_regs *regs) { regs->tlbflush = 0; } static inline void iommu_invalidate_page(struct iommu_regs *regs, unsigned long ba) { regs->pageflush = (ba & PAGE_MASK); } #endif /* !(_SPARC_IOMMU_H) */