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/*
* Written by: Garry Forsgren, Unisys Corporation
* Natalie Protasevich, Unisys Corporation
* This file contains the code to configure and interface
* with Unisys ES7000 series hardware system manager.
*
* Copyright (c) 2003 Unisys Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Unisys Corporation, Township Line & Union Meeting
* Roads-A, Unisys Way, Blue Bell, Pennsylvania, 19424, or:
*
* http://www.unisys.com
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <asm/io.h>
#include <asm/nmi.h>
#include <asm/smp.h>
#include <asm/apicdef.h>
#include "es7000.h"
/*
* ES7000 Globals
*/
volatile unsigned long *psai = NULL;
struct mip_reg *mip_reg;
struct mip_reg *host_reg;
int mip_port;
unsigned long mip_addr, host_addr;
#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI)
/*
* GSI override for ES7000 platforms.
*/
static unsigned int base;
static int
es7000_rename_gsi(int ioapic, int gsi)
{
if (!base) {
int i;
for (i = 0; i < nr_ioapics; i++)
base += nr_ioapic_registers[i];
}
if (!ioapic && (gsi < 16))
gsi += base;
return gsi;
}
#endif /* (CONFIG_X86_IO_APIC) && (CONFIG_ACPI) */
/*
* Parse the OEM Table
*/
int __init
parse_unisys_oem (char *oemptr, int oem_entries)
{
int i;
int success = 0;
unsigned char type, size;
unsigned long val;
char *tp = NULL;
struct psai *psaip = NULL;
struct mip_reg_info *mi;
struct mip_reg *host, *mip;
tp = oemptr;
tp += 8;
for (i=0; i <= oem_entries; i++) {
type = *tp++;
size = *tp++;
tp -= 2;
switch (type) {
case MIP_REG:
mi = (struct mip_reg_info *)tp;
val = MIP_RD_LO(mi->host_reg);
host_addr = val;
host = (struct mip_reg *)val;
host_reg = __va(host);
val = MIP_RD_LO(mi->mip_reg);
mip_port = MIP_PORT(mi->mip_info);
mip_addr = val;
mip = (struct mip_reg *)val;
mip_reg = __va(mip);
Dprintk("es7000_mipcfg: host_reg = 0x%lx \n",
(unsigned long)host_reg);
Dprintk("es7000_mipcfg: mip_reg = 0x%lx \n",
(unsigned long)mip_reg);
success++;
break;
case MIP_PSAI_REG:
psaip = (struct psai *)tp;
if (tp != NULL) {
if (psaip->addr)
psai = __va(psaip->addr);
else
psai = NULL;
success++;
}
break;
default:
break;
}
if (i == 6) break;
tp += size;
}
if (success < 2) {
es7000_plat = 0;
} else {
printk("\nEnabling ES7000 specific features...\n");
/*
* Determine the generation of the ES7000 currently running.
*
* es7000_plat = 0 if the machine is NOT a Unisys ES7000 box
* es7000_plat = 1 if the machine is a 5xx ES7000 box
* es7000_plat = 2 if the machine is a x86_64 ES7000 box
*
*/
if (!(boot_cpu_data.x86 <= 15 && boot_cpu_data.x86_model <= 2))
es7000_plat = 2;
else
es7000_plat = 1;
ioapic_renumber_irq = es7000_rename_gsi;
}
return es7000_plat;
}
int __init
find_unisys_acpi_oem_table(unsigned long *oem_addr, int *length)
{
struct acpi_table_rsdp *rsdp = NULL;
unsigned long rsdp_phys = 0;
struct acpi_table_header *header = NULL;
int i;
struct acpi_table_sdt sdt;
rsdp_phys = acpi_find_rsdp();
rsdp = __va(rsdp_phys);
if (rsdp->rsdt_address) {
struct acpi_table_rsdt *mapped_rsdt = NULL;
sdt.pa = rsdp->rsdt_address;
header = (struct acpi_table_header *)
__acpi_map_table(sdt.pa, sizeof(struct acpi_table_header));
if (!header)
return -ENODEV;
sdt.count = (header->length - sizeof(struct acpi_table_header)) >> 3;
mapped_rsdt = (struct acpi_table_rsdt *)
__acpi_map_table(sdt.pa, header->length);
if (!mapped_rsdt)
return -ENODEV;
header = &mapped_rsdt->header;
for (i = 0; i < sdt.count; i++)
sdt.entry[i].pa = (unsigned long) mapped_rsdt->entry[i];
};
for (i = 0; i < sdt.count; i++) {
header = (struct acpi_table_header *)
__acpi_map_table(sdt.entry[i].pa,
sizeof(struct acpi_table_header));
if (!header)
continue;
if (!strncmp((char *) &header->signature, "OEM1", 4)) {
if (!strncmp((char *) &header->oem_id, "UNISYS", 6)) {
void *addr;
struct oem_table *t;
acpi_table_print(header, sdt.entry[i].pa);
t = (struct oem_table *) __acpi_map_table(sdt.entry[i].pa, header->length);
addr = (void *) __acpi_map_table(t->OEMTableAddr, t->OEMTableSize);
*length = header->length;
*oem_addr = (unsigned long) addr;
return 0;
}
}
}
Dprintk("ES7000: did not find Unisys ACPI OEM table!\n");
return -1;
}
static void
es7000_spin(int n)
{
int i = 0;
while (i++ < n)
rep_nop();
}
static int __init
es7000_mip_write(struct mip_reg *mip_reg)
{
int status = 0;
int spin;
spin = MIP_SPIN;
while (((unsigned long long)host_reg->off_38 &
(unsigned long long)MIP_VALID) != 0) {
if (--spin <= 0) {
printk("es7000_mip_write: Timeout waiting for Host Valid Flag");
return -1;
}
es7000_spin(MIP_SPIN);
}
memcpy(host_reg, mip_reg, sizeof(struct mip_reg));
outb(1, mip_port);
spin = MIP_SPIN;
while (((unsigned long long)mip_reg->off_38 &
(unsigned long long)MIP_VALID) == 0) {
if (--spin <= 0) {
printk("es7000_mip_write: Timeout waiting for MIP Valid Flag");
return -1;
}
es7000_spin(MIP_SPIN);
}
status = ((unsigned long long)mip_reg->off_0 &
(unsigned long long)0xffff0000000000ULL) >> 48;
mip_reg->off_38 = ((unsigned long long)mip_reg->off_38 &
(unsigned long long)~MIP_VALID);
return status;
}
int
es7000_start_cpu(int cpu, unsigned long eip)
{
unsigned long vect = 0, psaival = 0;
if (psai == NULL)
return -1;
vect = ((unsigned long)__pa(eip)/0x1000) << 16;
psaival = (0x1000000 | vect | cpu);
while (*psai & 0x1000000)
;
*psai = psaival;
return 0;
}
int
es7000_stop_cpu(int cpu)
{
int startup;
if (psai == NULL)
return -1;
startup= (0x1000000 | cpu);
while ((*psai & 0xff00ffff) != startup)
;
startup = (*psai & 0xff0000) >> 16;
*psai &= 0xffffff;
return 0;
}
void __init
es7000_sw_apic()
{
if (es7000_plat) {
int mip_status;
struct mip_reg es7000_mip_reg;
printk("ES7000: Enabling APIC mode.\n");
memset(&es7000_mip_reg, 0, sizeof(struct mip_reg));
es7000_mip_reg.off_0 = MIP_SW_APIC;
es7000_mip_reg.off_38 = (MIP_VALID);
while ((mip_status = es7000_mip_write(&es7000_mip_reg)) != 0)
printk("es7000_sw_apic: command failed, status = %x\n",
mip_status);
return;
}
}
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