/* 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 0 xf0000000 /* Implementation */
#define IOMMU_CTRL_VERS 0 x0f000000 /* Version */
#define IOMMU_CTRL_RNGE 0 x0000001c /* Mapping RANGE */
#define IOMMU_RNGE_16MB 0 x00000000 /* 0xff000000 -> 0xffffffff */
#define IOMMU_RNGE_32MB 0 x00000004 /* 0xfe000000 -> 0xffffffff */
#define IOMMU_RNGE_64MB 0 x00000008 /* 0xfc000000 -> 0xffffffff */
#define IOMMU_RNGE_128MB 0 x0000000c /* 0xf8000000 -> 0xffffffff */
#define IOMMU_RNGE_256MB 0 x00000010 /* 0xf0000000 -> 0xffffffff */
#define IOMMU_RNGE_512MB 0 x00000014 /* 0xe0000000 -> 0xffffffff */
#define IOMMU_RNGE_1GB 0 x00000018 /* 0xc0000000 -> 0xffffffff */
#define IOMMU_RNGE_2GB 0 x0000001c /* 0x80000000 -> 0xffffffff */
#define IOMMU_CTRL_ENAB 0 x00000001 /* IOMMU Enable */
#define IOMMU_AFSR_ERR 0 x80000000 /* LE, TO, or BE asserted */
#define IOMMU_AFSR_LE 0 x40000000 /* SBUS reports error after transaction */
#define IOMMU_AFSR_TO 0 x20000000 /* Write access took more than 12.8 us. */
#define IOMMU_AFSR_BE 0 x10000000 /* Write access received error acknowledge */
#define IOMMU_AFSR_SIZE 0 x0e000000 /* Size of transaction causing error */
#define IOMMU_AFSR_S 0 x01000000 /* Sparc was in supervisor mode */
#define IOMMU_AFSR_RESV 0 x00f00000 /* Reserver, forced to 0x8 by hardware */
#define IOMMU_AFSR_ME 0 x00080000 /* Multiple errors occurred */
#define IOMMU_AFSR_RD 0 x00040000 /* A read operation was in progress */
#define IOMMU_AFSR_FAV 0 x00020000 /* IOMMU afar has valid contents */
#define IOMMU_SBCFG_SAB30 0 x00010000 /* Phys-address bit 30 when bypass enabled */
#define IOMMU_SBCFG_BA16 0 x00000004 /* Slave supports 16 byte bursts */
#define IOMMU_SBCFG_BA8 0 x00000002 /* Slave supports 8 byte bursts */
#define IOMMU_SBCFG_BYPASS 0 x00000001 /* Bypass IOMMU, treat all addresses
produced by this device as pure
physical. */
#define IOMMU_MFSR_ERR 0 x80000000 /* One or more of PERR1 or PERR0 */
#define IOMMU_MFSR_S 0 x01000000 /* Sparc was in supervisor mode */
#define IOMMU_MFSR_CPU 0 x00800000 /* CPU transaction caused parity error */
#define IOMMU_MFSR_ME 0 x00080000 /* Multiple parity errors occurred */
#define IOMMU_MFSR_PERR 0 x00006000 /* 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 0 x00001000 /* Error occurred while in boot mode */
#define IOMMU_MFSR_C 0 x00000800 /* Address causing error was marked cacheable */
#define IOMMU_MFSR_RTYP 0 x000000f0 /* Memory request transaction type */
#define IOMMU_MID_SBAE 0 x001f0000 /* SBus arbitration enable */
#define IOMMU_MID_SE 0 x00100000 /* Enables SCSI/ETHERNET arbitration */
#define IOMMU_MID_SB3 0 x00080000 /* Enable SBUS device 3 arbitration */
#define IOMMU_MID_SB2 0 x00040000 /* Enable SBUS device 2 arbitration */
#define IOMMU_MID_SB1 0 x00020000 /* Enable SBUS device 1 arbitration */
#define IOMMU_MID_SB0 0 x00010000 /* Enable SBUS device 0 arbitration */
#define IOMMU_MID_MID 0 x0000000f /* Module-id, hardcoded to 0x8 */
/* The format of an iopte in the page tables */
#define IOPTE_PAGE 0 x07ffff00 /* Physical page number (PA[30:12]) */
#define IOPTE_CACHE 0 x00000080 /* Cached (in vme IOCACHE or Viking/MXCC) */
#define IOPTE_WRITE 0 x00000004 /* Writeable */
#define IOPTE_VALID 0 x00000002 /* IOPTE is valid */
#define IOPTE_WAZ 0 x00000001 /* 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) */
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