NetBSD-5.0.2/sys/arch/vax/vax/ka43.c
/* $NetBSD: ka43.c,v 1.33 2008/03/11 05:34:03 matt Exp $ */
/*
* Copyright (c) 1996 Ludd, University of Lule}, Sweden.
* All rights reserved.
*
* This code is derived from software contributed to Ludd by Bertram Barth.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed at Ludd, University of
* Lule}, Sweden and its contributors.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ka43.c,v 1.33 2008/03/11 05:34:03 matt Exp $");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <uvm/uvm_extern.h>
#include <machine/pte.h>
#include <machine/cpu.h>
#include <machine/mtpr.h>
#include <machine/sid.h>
#include <machine/pmap.h>
#include <machine/nexus.h>
#include <machine/uvax.h>
#include <machine/vsbus.h>
#include <machine/ka43.h>
#include <machine/clock.h>
static void ka43_conf(void);
static void ka43_steal_pages(void);
static int ka43_mchk(void *);
static void ka43_memerr(void);
#if 0
static void ka43_clear_errors(void);
#endif
static int ka43_cache_init(void); /* "int mapen" as argument? */
static int ka43_cache_reset(void);
static int ka43_cache_enable(void);
static int ka43_cache_disable(void);
static int ka43_cache_invalidate(void);
static void ka43_halt(void);
static void ka43_reboot(int);
static void ka43_clrf(void);
static const char * const ka43_devs[] = { "cpu", "vsbus", NULL };
const struct cpu_dep ka43_calls = {
.cpu_steal_pages = ka43_steal_pages,
.cpu_mchk = ka43_mchk,
.cpu_memerr = ka43_memerr,
.cpu_conf = ka43_conf,
.cpu_gettime = chip_gettime,
.cpu_settime = chip_settime,
.cpu_vups = 7, /* 7.6 VUP */
.cpu_scbsz = 2, /* SCB pages */
.cpu_halt = ka43_halt,
.cpu_reboot = ka43_reboot,
.cpu_clrf = ka43_clrf,
.cpu_devs = ka43_devs,
.cpu_flags = CPU_RAISEIPL,
};
/*
* ka43_steal_pages() is called with MMU disabled, after that call MMU gets
* enabled. Thus we initialize these four pointers with physical addresses,
* but before leving ka43_steal_pages() we reset them to virtual addresses.
*/
static volatile struct ka43_cpu *ka43_cpu = (void*)KA43_CPU_BASE;
static volatile u_int *ka43_creg = (void*)KA43_CH2_CREG;
static volatile u_int *ka43_ctag = (void*)KA43_CT2_BASE;
#define KA43_MC_RESTART 0x00008000 /* Restart possible*/
#define KA43_PSL_FPDONE 0x00010000 /* First Part Done */
struct ka43_mcframe { /* Format of RigelMAX machine check frame: */
int mc43_bcnt; /* byte count, always 24 (0x18) */
int mc43_code; /* machine check type code and restart bit */
int mc43_addr; /* most recent (faulting?) virtual address */
int mc43_viba; /* contents of VIBA register */
int mc43_sisr; /* ICCS bit 6 and SISR bits 15:0 */
int mc43_istate; /* internal state */
int mc43_sc; /* shift count register */
int mc43_pc; /* trapped PC */
int mc43_psl; /* trapped PSL */
};
static const char * const ka43_mctype[] = {
"no error (0)", /* Code 0: No error */
"FPA: protocol error", /* Code 1-5: FPA errors */
"FPA: illegal opcode",
"FPA: operand parity error",
"FPA: unknown status",
"FPA: result parity error",
"unused (6)", /* Code 6-7: Unused */
"unused (7)",
"MMU error (TLB miss)", /* Code 8-9: MMU errors */
"MMU error (TLB hit)",
"HW interrupt at unused IPL", /* Code 10: Interrupt error */
"MOVCx impossible state", /* Code 11-13: Microcode errors */
"undefined trap code (i-box)",
"undefined control store address",
"unused (14)", /* Code 14-15: Unused */
"unused (15)",
"PC tag or data parity error", /* Code 16: Cache error */
"data bus parity error", /* Code 17: Read error */
"data bus error (NXM)", /* Code 18: Write error */
"undefined data bus state", /* Code 19: Bus error */
};
#define MC43_MAX 19
static int ka43_error_count = 0;
int
ka43_mchk(void *addr)
{
struct ka43_mcframe *mcf = (void*)addr;
mtpr(0x00, PR_MCESR); /* Acknowledge the machine check */
printf("machine check %d (0x%x)\n", mcf->mc43_code, mcf->mc43_code);
printf("reason: %s\n", ka43_mctype[mcf->mc43_code & 0xff]);
if (++ka43_error_count > 10) {
printf("error_count exceeded: %d\n", ka43_error_count);
return (-1);
}
/*
* If either the Restart flag is set or the First-Part-Done flag
* is set, and the TRAP2 (double error) bit is not set, then the
* error is recoverable.
*/
if (mfpr(PR_PCSTS) & KA43_PCS_TRAP2) {
printf("TRAP2 (double error) in ka43_mchk.\n");
panic("unrecoverable state in ka43_mchk.");
return (-1);
}
if ((mcf->mc43_code & KA43_MC_RESTART) ||
(mcf->mc43_psl & KA43_PSL_FPDONE)) {
printf("ka43_mchk: recovering from machine-check.\n");
ka43_cache_reset(); /* reset caches */
return (0); /* go on; */
}
/*
* Unknown error state, panic/halt the machine!
*/
printf("ka43_mchk: unknown error state!\n");
return (-1);
}
void
ka43_memerr(void)
{
char sbuf[256];
/*
* Don\'t know what to do here. So just print some messages
* and try to go on...
*/
printf("memory error!\n");
bitmask_snprintf(mfpr(PR_PCSTS), KA43_PCSTS_BITS, sbuf, sizeof(sbuf));
printf("primary cache status: %s\n", sbuf);
bitmask_snprintf(*ka43_creg, KA43_SESR_BITS, sbuf, sizeof(sbuf));
printf("secondary cache status: %s\n", sbuf);
}
int
ka43_cache_init(void)
{
return (ka43_cache_reset());
}
#if 0
void
ka43_clear_errors(void)
{
int val = *ka43_creg;
val |= KA43_SESR_SERR | KA43_SESR_LERR | KA43_SESR_CERR;
*ka43_creg = val;
}
#endif
int
ka43_cache_reset(void)
{
char sbuf[256];
/*
* resetting primary and secondary caches is done in three steps:
* 1. disable both caches
* 2. manually clear secondary cache
* 3. enable both caches
*/
ka43_cache_disable();
ka43_cache_invalidate();
ka43_cache_enable();
bitmask_snprintf(mfpr(PR_PCSTS), KA43_PCSTS_BITS, sbuf, sizeof(sbuf));
printf("primary cache status: %s\n", sbuf);
bitmask_snprintf(*ka43_creg, KA43_SESR_BITS, sbuf, sizeof(sbuf));
printf("secondary cache status: %s\n", sbuf);
return (0);
}
int
ka43_cache_disable(void)
{
int val;
/*
* first disable primary cache and clear error flags
*/
mtpr(KA43_PCS_REFRESH, PR_PCSTS); /* disable primary cache */
val = mfpr(PR_PCSTS);
mtpr(val, PR_PCSTS); /* clear error flags */
/*
* now disable secondary cache and clear error flags
*/
val = *ka43_creg & ~KA43_SESR_CENB; /* BICL !!! */
*ka43_creg = val; /* disable secondary cache */
val = KA43_SESR_SERR | KA43_SESR_LERR | KA43_SESR_CERR;
*ka43_creg = val; /* clear error flags */
return (0);
}
int
ka43_cache_invalidate(void)
{
int i, val;
val = KA43_PCTAG_PARITY; /* clear valid flag, set parity bit */
for (i = 0; i < 256; i++) { /* 256 Quadword entries */
mtpr(i*8, PR_PCIDX); /* write index of tag */
mtpr(val, PR_PCTAG); /* write value into tag */
}
val = KA43_PCS_FLUSH | KA43_PCS_REFRESH;
mtpr(val, PR_PCSTS); /* flush primary cache */
/*
* Rigel\'s secondary cache doesn\'t implement a valid-flag.
* Thus we initialize all entries with out-of-range/dummy
* addresses which will never be referenced (ie. never hit).
* After enabling cache we also access 128K of memory starting
* at 0x00 so that secondary cache will be filled with these
* valid addresses...
*/
val = 0xff;
/* if (memory > 28 MB) val = 0x55; */
for (i = 0; i < KA43_CT2_SIZE; i+= 4) { /* Quadword entries ?? */
ka43_ctag[i/4] = val; /* reset upper and lower */
}
return (0);
}
int
ka43_cache_enable(void)
{
volatile char *membase = (void*)0x80000000; /* physical 0x00 */
int i, val;
val = KA43_PCS_FLUSH | KA43_PCS_REFRESH;
mtpr(val, PR_PCSTS); /* flush primary cache */
/*
* now we enable secondary cache and access first 128K of memory
* so that secondary cache gets really initialized and holds
* valid addresses/data...
*/
*ka43_creg = KA43_SESR_CENB; /* enable secondary cache */
for (i=0; i<128*1024; i++) {
val += membase[i]; /* some dummy operation... */
}
val = KA43_PCS_ENABLE | KA43_PCS_REFRESH;
mtpr(val, PR_PCSTS); /* enable primary cache */
return (0);
}
void
ka43_conf(void)
{
curcpu()->ci_cpustr = "Rigel, 2KB L1 cache, 128KB L2 cache";
ka43_cpu = (void *)vax_map_physmem(VS_REGS, 1);
ka43_creg = (void *)vax_map_physmem(KA43_CH2_CREG, 1);
ka43_ctag = (void *)vax_map_physmem(KA43_CT2_BASE,
(KA43_CT2_SIZE/VAX_NBPG));
/*
* ka43_conf() gets called with MMU enabled, now it's save to
* init/reset the caches.
*/
ka43_cache_init();
clk_adrshift = 1; /* Addressed at long's... */
clk_tweak = 2; /* ...and shift two */
clk_page = (short *)vax_map_physmem(VS_CLOCK, 1);
}
/*
* The interface for communication with the LANCE ethernet controller
* is setup in the xxx_steal_pages() routine. We decrease highest
* available address by 64K and use this area as communication buffer.
*/
void
ka43_steal_pages(void)
{
int val;
/*
* if LANCE\'s io-buffer is above 16 MB, then the appropriate flag
* in the parity control register has to be set (it works as an
* additional address bit). In any case, don\'t enable CPEN and
* DPEN in the PARCTL register, somewhow they are internally managed
* by the RIGEL chip itself!?!
*/
val = ka43_cpu->parctl & 0x03; /* read the old value */
ka43_cpu->parctl = val; /* and write new value */
}
void
ka43_clrf(void)
{
volatile struct ka43_clock *clk = (volatile void *)clk_page;
/*
* Clear restart and boot in progress flags in the CPMBX.
* The cpmbx is split into two 4-bit fields.
* One for the current restart/boot in progress flags, and
* one for the permanent halt flag.
* The restart/boot in progress flag is also used as the action request
* for the CPU at a halt. /BQT
*/
clk->req = 0;
}
void
ka43_halt(void)
{
volatile struct ka43_clock *clk = (volatile void *)clk_page;
clk->req = 3; /* 3 is halt. */
__asm("halt");
}
void
ka43_reboot(int arg)
{
volatile struct ka43_clock *clk = (volatile void *)clk_page;
clk->req = 2; /* 2 is reboot. */
__asm("halt");
}