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Diffstat (limited to 'arch/sparc/include/asm/iommu_32.h')
| -rw-r--r-- | arch/sparc/include/asm/iommu_32.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/iommu_32.h b/arch/sparc/include/asm/iommu_32.h new file mode 100644 index 000000000..af51cd5ea --- /dev/null +++ b/arch/sparc/include/asm/iommu_32.h @@ -0,0 +1,122 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* 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 __iomem *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 __iomem *regs) +{ + sbus_writel(0, ®s->tlbflush); +} + +static inline void iommu_invalidate_page(struct iommu_regs __iomem *regs, unsigned long ba) +{ + sbus_writel(ba & PAGE_MASK, ®s->pageflush); +} + +#endif /* !(_SPARC_IOMMU_H) */ |