arch/sparc/include/asm/msi.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * msi.h:  Defines specific to the MBus - Sbus - Interface.
   4  *
   5  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
   7  */
   8
   9 #ifndef _SPARC_MSI_H
  10 #define _SPARC_MSI_H
  11
  12 /*
  13  * Locations of MSI Registers.
  14  */
  15 #define MSI_MBUS_ARBEN  0xe0001008      /* MBus Arbiter Enable register */
  16
  17 /*
  18  * Useful bits in the MSI Registers.
  19  */
  20 #define MSI_ASYNC_MODE  0x80000000      /* Operate the MSI asynchronously */
  21
  22
  23 static inline void msi_set_sync(void)
  24 {
  25         __asm__ __volatile__ ("lda [%0] %1, %%g3\n\t"
  26                               "andn %%g3, %2, %%g3\n\t"
  27                               "sta %%g3, [%0] %1\n\t" : :
  28                               "r" (MSI_MBUS_ARBEN),
  29                               "i" (ASI_M_CTL), "r" (MSI_ASYNC_MODE) : "g3");
  30 }
  31
  32 #endif /* !(_SPARC_MSI_H) */