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- /* 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>
- /* 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;
- iopte_t *lowest; /* to speed up searches... */
- unsigned long plow;
- /* For convenience */
- unsigned long start; /* First managed virtual address */
- unsigned long end; /* Last managed virtual address */
- };
- extern __inline__ void iommu_invalidate(struct iommu_regs *regs)
- {
- regs->tlbflush = 0;
- }
- extern __inline__ void iommu_invalidate_page(struct iommu_regs *regs, unsigned long page)
- {
- regs->pageflush = (page & PAGE_MASK);
- }
- #endif /* !(_SPARC_IOMMU_H) */
