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/* $Id: viking.h,v 1.1 2005-12-20 11:32:12 jcastillo Exp $

 * viking.h:  Defines specific to the GNU/Viking MBUS module.

 *            This is SRMMU stuff.

 *

 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)

 */

#ifndef _SPARC_VIKING_H

#define _SPARC_VIKING_H

#include <asm/mxcc.h>

/* Bits in the SRMMU control register for GNU/Viking modules.

 *

 * -----------------------------------------------------------

 * |impl-vers| RSV |TC|AC|SP|BM|PC|MBM|SB|IC|DC|PSO|RSV|NF|ME|

 * -----------------------------------------------------------

 *  31     24 23-17 16 15 14 13 12 11  10  9  8  7  6-2  1  0

 *

 * TC: Tablewalk Cacheable -- 0 = Twalks are not cacheable in E-cache

 *                            1 = Twalks are cacheable in E-cache

 *

 * GNU/Viking will only cache tablewalks in the E-cache (mxcc) if present

 * and never caches them internally (or so states the docs).  Therefore

 * for machines lacking an E-cache (ie. in MBUS mode) this bit must

 * remain cleared.

 *

 * AC: Alternate Cacheable -- 0 = Passthru physical accesses not cacheable

 *                            1 = Passthru physical accesses cacheable

 *

 * This indicates whether accesses are cacheable when no cachable bit

 * is present in the pte when the processor is in boot-mode or the

 * access does not need pte's for translation (ie. pass-thru ASI's).

 * "Cachable" is only referring to E-cache (if present) and not the

 * on chip split I/D caches of the GNU/Viking.

 *

 * SP: SnooP Enable -- 0 = bus snooping off, 1 = bus snooping on

 *

 * This enables snooping on the GNU/Viking bus.  This must be on

 * for the hardware cache consistency mechanisms of the GNU/Viking

 * to work at all.  On non-mxcc GNU/Viking modules the split I/D

 * caches will snoop regardless of whether they are enabled, this

 * takes care of the case where the I or D or both caches are turned

 * off yet still contain valid data.  Note also that this bit does

 * not affect GNU/Viking store-buffer snoops, those happen if the

 * store-buffer is enabled no matter what.

 *

 * BM: Boot Mode -- 0 = not in boot mode, 1 = in boot mode

 *

 * This indicates whether the GNU/Viking is in boot-mode or not,

 * if it is then all instruction fetch physical addresses are

 * computed as 0xff0000000 + low 28 bits of requested address.

 * GNU/Viking boot-mode does not affect data accesses.  Also,

 * in boot mode instruction accesses bypass the split on chip I/D

 * caches, they may be cached by the GNU/MXCC if present and enabled.

 *

 * MBM: MBus Mode -- 0 = not in MBus mode, 1 = in MBus mode

 *

 * This indicated the GNU/Viking configuration present.  If in

 * MBUS mode, the GNU/Viking lacks a GNU/MXCC E-cache.  If it is

 * not then the GNU/Viking is on a module VBUS connected directly

 * to a GNU/MXCC cache controller.  The GNU/MXCC can be thus connected

 * to either an GNU/MBUS (sun4m) or the packet-switched GNU/XBus (sun4d).

 *

 * SB: StoreBuffer enable -- 0 = store buffer off, 1 = store buffer on

 *

 * The GNU/Viking store buffer allows the chip to continue execution

 * after a store even if the data cannot be placed in one of the

 * caches during that cycle.  If disabled, all stores operations

 * occur synchronously.

 *

 * IC: Instruction Cache -- 0 = off, 1 = on

 * DC: Data Cache -- 0 = off, 1 = 0n

 *

 * These bits enable the on-cpu GNU/Viking split I/D caches.  Note,

 * as mentioned above, these caches will snoop the bus in GNU/MBUS

 * configurations even when disabled to avoid data corruption.

 *

 * NF: No Fault -- 0 = faults generate traps, 1 = faults don't trap

 * ME: MMU enable -- 0 = mmu not translating, 1 = mmu translating

 *

 */

#define VIKING_MMUENABLE    0x00000001

#define VIKING_NOFAULT      0x00000002

#define VIKING_PSO          0x00000080

#define VIKING_DCENABLE     0x00000100   /* Enable data cache */

#define VIKING_ICENABLE     0x00000200   /* Enable instruction cache */

#define VIKING_SBENABLE     0x00000400   /* Enable store buffer */

#define VIKING_MMODE        0x00000800   /* MBUS mode */

#define VIKING_PCENABLE     0x00001000   /* Enable parity checking */

#define VIKING_BMODE        0x00002000   

#define VIKING_SPENABLE     0x00004000   /* Enable bus cache snooping */

#define VIKING_ACENABLE     0x00008000   /* Enable alternate caching */

#define VIKING_TCENABLE     0x00010000   /* Enable table-walks to be cached */

/*

 * GNU/Viking Breakpoint Action Register fields.

 */

#define VIKING_ACTION_MIX   0x00001000   /* Enable multiple instructions */

/*

 * GNU/Viking Cache Tags.

 */

#define VIKING_PTAG_VALID   0x01000000   /* Cache block is valid */

#define VIKING_PTAG_DIRTY   0x00010000   /* Block has been modified */

#define VIKING_PTAG_SHARED  0x00000100   /* Shared with some other cache */

extern inline void viking_flush_icache(void)

{

        __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" : :

                             "i" (ASI_M_IC_FLCLEAR));

}

extern inline void viking_flush_dcache(void)

{

        __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" : :

                             "i" (ASI_M_DC_FLCLEAR));

}

extern inline void viking_unlock_icache(void)

{

        __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :

                             "r" (0x80000000), "i" (ASI_M_IC_FLCLEAR));

}

extern inline void viking_unlock_dcache(void)

{

        __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :

                             "r" (0x80000000), "i" (ASI_M_DC_FLCLEAR));

}

extern inline void viking_set_bpreg(unsigned long regval)

{

        __asm__ __volatile__("sta %0, [%%g0] %1\n\t" : :

                             "r" (regval),

                             "i" (ASI_M_ACTION));

}

extern inline unsigned long viking_get_bpreg(void)

{

        unsigned long regval;

        __asm__ __volatile__("lda [%%g0] %1, %0\n\t" :

                             "=r" (regval) :

                             "i" (ASI_M_ACTION));

        return regval;

}

extern inline void viking_get_dcache_ptag(int set, int block,

                                          unsigned long *data)

{

        unsigned long ptag = ((set & 0x7f) << 5) | ((block & 0x3) << 26) |

                             0x80000000;

        unsigned long info, page;

        __asm__ __volatile__ ("ldda [%2] %3, %%g2\n\t"

                              "or %%g0, %%g2, %0\n\t"

                              "or %%g0, %%g3, %1\n\t" :

                              "=r" (info), "=r" (page) :

                              "r" (ptag), "i" (ASI_M_DATAC_TAG) :

                              "g2", "g3");

        data[0] = info;

        data[1] = page;

}

#endif /* !(_SPARC_VIKING_H) */