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/*
* tables.c - ACPI tables, chipset, and errata handling
*
* Copyright (C) 2000 Andrew Henroid
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/acpi.h>
#include "acpi.h"
#include "driver.h"
#define _COMPONENT OS_DEPENDENT
MODULE_NAME ("tables")
struct acpi_facp acpi_facp;
#define ACPI_DUMMY_CHECKSUM 9
#define ACPI_DUMMY_PBLK 51
static u8 acpi_dummy_dsdt[] =
{
0x44, 0x53, 0x44, 0x54, // "DSDT"
0x38, 0x00, 0x00, 0x00, // length
0x01, // revision
0x00, // checksum
0x4c, 0x49, 0x4e, 0x55, 0x58, 0x00, // "LINUX"
0x44, 0x55, 0x4d, 0x4d, 0x59, 0x00, 0x00, 0x00, // "DUMMY"
0x01, 0x00, 0x00, 0x00, // OEM rev
0x4c, 0x4e, 0x55, 0x58, // "LNUX"
0x01, 0x00, 0x00, 0x00, // creator rev
0x10, // Scope
0x13, // PkgLength
0x5c, 0x5f, 0x50, 0x52, 0x5f, // \_PR_
0x5b, 0x83, // Processor
0x0b, // PkgLength
0x43, 0x50, 0x55, 0x30, // CPU0
0x00, // ID
0x00, 0x00, 0x00, 0x00, // PBLK
0x06 // PBLK size
};
/*
* Calculate and set ACPI table checksum
*/
static void
acpi_set_checksum(u8 *table, int size)
{
int i, sum = 0;
for (i = 0; i < size; i++)
sum += (int) table[i];
sum = (0x100 - ((sum - table[ACPI_DUMMY_CHECKSUM]) & 0xff));
table[ACPI_DUMMY_CHECKSUM] = sum;
}
/*
* Init PIIX4 device, create a fake FACP
*/
static int
acpi_init_piix4(struct pci_dev *dev)
{
u32 base, pblk;
u16 cmd;
u8 pmregmisc;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (!(cmd & PCI_COMMAND_IO))
return -ENODEV;
pci_read_config_byte(dev, ACPI_PIIX4_PMREGMISC, &pmregmisc);
if (!(pmregmisc & ACPI_PIIX4_PMIOSE))
return -ENODEV;
base = pci_resource_start (dev, PCI_BRIDGE_RESOURCES);
if (!base)
return -ENODEV;
printk(KERN_INFO "ACPI: found \"%s\" at 0x%04x\n", dev->name, base);
memset(&acpi_facp, 0, sizeof(acpi_facp));
acpi_facp.hdr.signature = ACPI_FACP_SIG;
acpi_facp.hdr.length = sizeof(acpi_facp);
acpi_facp.int_model = ACPI_PIIX4_INT_MODEL;
acpi_facp.sci_int = ACPI_PIIX4_SCI_INT;
acpi_facp.smi_cmd = ACPI_PIIX4_SMI_CMD;
acpi_facp.acpi_enable = ACPI_PIIX4_ACPI_ENABLE;
acpi_facp.acpi_disable = ACPI_PIIX4_ACPI_DISABLE;
acpi_facp.s4bios_req = ACPI_PIIX4_S4BIOS_REQ;
acpi_facp.pm1a_evt = base + ACPI_PIIX4_PM1_EVT;
acpi_facp.pm1a_cnt = base + ACPI_PIIX4_PM1_CNT;
acpi_facp.pm2_cnt = ACPI_PIIX4_PM2_CNT;
acpi_facp.pm_tmr = base + ACPI_PIIX4_PM_TMR;
acpi_facp.gpe0 = base + ACPI_PIIX4_GPE0;
acpi_facp.pm1_evt_len = ACPI_PIIX4_PM1_EVT_LEN;
acpi_facp.pm1_cnt_len = ACPI_PIIX4_PM1_CNT_LEN;
acpi_facp.pm2_cnt_len = ACPI_PIIX4_PM2_CNT_LEN;
acpi_facp.pm_tm_len = ACPI_PIIX4_PM_TM_LEN;
acpi_facp.gpe0_len = ACPI_PIIX4_GPE0_LEN;
acpi_facp.p_lvl2_lat = (__u16) ACPI_INFINITE_LAT;
acpi_facp.p_lvl3_lat = (__u16) ACPI_INFINITE_LAT;
acpi_set_checksum((u8*) &acpi_facp, sizeof(acpi_facp));
acpi_load_table((ACPI_TABLE_HEADER*) &acpi_facp);
pblk = base + ACPI_PIIX4_P_BLK;
memcpy(acpi_dummy_dsdt + ACPI_DUMMY_PBLK, &pblk, sizeof(pblk));
acpi_set_checksum(acpi_dummy_dsdt, sizeof(acpi_dummy_dsdt));
acpi_load_table((ACPI_TABLE_HEADER*) acpi_dummy_dsdt);
return 0;
}
/*
* Init VIA ACPI device and create a fake FACP
*/
static int
acpi_init_via(struct pci_dev *dev)
{
u32 base, pblk;
u8 tmp, irq;
pci_read_config_byte(dev, 0x41, &tmp);
if (!(tmp & 0x80))
return -ENODEV;
base = pci_resource_start(dev, PCI_BRIDGE_RESOURCES);
if (!base) {
base = pci_resource_start(dev, PCI_BASE_ADDRESS_4);
if (!base)
return -ENODEV;
}
pci_read_config_byte(dev, 0x42, &irq);
printk(KERN_INFO "ACPI: found \"%s\" at 0x%04x\n", dev->name, base);
memset(&acpi_facp, 0, sizeof(acpi_facp));
acpi_facp.hdr.signature = ACPI_FACP_SIG;
acpi_facp.hdr.length = sizeof(acpi_facp);
acpi_facp.int_model = ACPI_VIA_INT_MODEL;
acpi_facp.sci_int = irq;
acpi_facp.smi_cmd = base + ACPI_VIA_SMI_CMD;
acpi_facp.acpi_enable = ACPI_VIA_ACPI_ENABLE;
acpi_facp.acpi_disable = ACPI_VIA_ACPI_DISABLE;
acpi_facp.pm1a_evt = base + ACPI_VIA_PM1_EVT;
acpi_facp.pm1a_cnt = base + ACPI_VIA_PM1_CNT;
acpi_facp.pm_tmr = base + ACPI_VIA_PM_TMR;
acpi_facp.gpe0 = base + ACPI_VIA_GPE0;
acpi_facp.pm1_evt_len = ACPI_VIA_PM1_EVT_LEN;
acpi_facp.pm1_cnt_len = ACPI_VIA_PM1_CNT_LEN;
acpi_facp.pm_tm_len = ACPI_VIA_PM_TM_LEN;
acpi_facp.gpe0_len = ACPI_VIA_GPE0_LEN;
acpi_facp.p_lvl2_lat = (__u16) ACPI_INFINITE_LAT;
acpi_facp.p_lvl3_lat = (__u16) ACPI_INFINITE_LAT;
acpi_facp.duty_offset = ACPI_VIA_DUTY_OFFSET;
acpi_facp.duty_width = ACPI_VIA_DUTY_WIDTH;
acpi_facp.day_alarm = ACPI_VIA_DAY_ALARM;
acpi_facp.mon_alarm = ACPI_VIA_MON_ALARM;
acpi_facp.century = ACPI_VIA_CENTURY;
acpi_set_checksum((u8*) &acpi_facp, sizeof(acpi_facp));
acpi_load_table((ACPI_TABLE_HEADER*) &acpi_facp);
pblk = base + ACPI_VIA_P_BLK;
memcpy(acpi_dummy_dsdt + ACPI_DUMMY_PBLK, &pblk, sizeof(pblk));
acpi_set_checksum(acpi_dummy_dsdt, sizeof(acpi_dummy_dsdt));
acpi_load_table((ACPI_TABLE_HEADER*) acpi_dummy_dsdt);
return 0;
}
typedef enum
{
CH_UNKNOWN = 0,
CH_INTEL_PIIX4,
CH_VIA_586,
CH_VIA_686A,
} acpi_chip_t;
/* indexed by value of each enum in acpi_chip_t */
const static struct
{
int (*chip_init)(struct pci_dev *dev);
} acpi_chip_info[] =
{
{NULL,},
{acpi_init_piix4},
{acpi_init_via},
{acpi_init_via},
};
static struct pci_device_id acpi_pci_tbl[] =
{
{0x8086, 0x7113, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CH_INTEL_PIIX4},
{0x1106, 0x3040, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CH_VIA_586},
{0x1106, 0x3057, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CH_VIA_686A},
{0,} /* terminate list */
};
static int
acpi_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
return acpi_chip_info[id->driver_data].chip_init(dev);
}
static struct pci_driver acpi_driver =
{
name: "acpi",
id_table: acpi_pci_tbl,
probe: acpi_probe,
};
static int acpi_driver_registered = 0;
/*
* Locate a known ACPI chipset
*/
static int
acpi_find_chipset(void)
{
if (pci_register_driver(&acpi_driver) < 1)
return -ENODEV;
acpi_driver_registered = 1;
return 0;
}
/*
* Fetch the FACP information
*/
static int
acpi_fetch_facp(void)
{
ACPI_BUFFER buffer;
memset(&acpi_facp, 0, sizeof(acpi_facp));
buffer.pointer = &acpi_facp;
buffer.length = sizeof(acpi_facp);
if (!ACPI_SUCCESS(acpi_get_table(ACPI_TABLE_FACP, 1, &buffer))) {
printk(KERN_ERR "ACPI: missing FACP\n");
return -ENODEV;
}
if (acpi_facp.p_lvl2_lat
&& acpi_facp.p_lvl2_lat <= ACPI_MAX_P_LVL2_LAT) {
acpi_c2_exit_latency
= ACPI_uS_TO_TMR_TICKS(acpi_facp.p_lvl2_lat);
acpi_c2_enter_latency
= ACPI_uS_TO_TMR_TICKS(ACPI_TMR_HZ / 1000);
}
if (acpi_facp.p_lvl3_lat
&& acpi_facp.p_lvl3_lat <= ACPI_MAX_P_LVL3_LAT) {
acpi_c3_exit_latency
= ACPI_uS_TO_TMR_TICKS(acpi_facp.p_lvl3_lat);
acpi_c3_enter_latency
= ACPI_uS_TO_TMR_TICKS(acpi_facp.p_lvl3_lat * 5);
}
return 0;
}
/*
* Find and load ACPI tables
*/
int
acpi_load_tables(void)
{
if (ACPI_SUCCESS(acpi_load_firmware_tables()))
{
printk(KERN_INFO "ACPI: support found\n");
}
else if (acpi_find_chipset()) {
acpi_terminate();
return -1;
}
if (acpi_fetch_facp()) {
acpi_terminate();
return -1;
}
if (!ACPI_SUCCESS(acpi_load_namespace())) {
printk(KERN_ERR "ACPI: namespace load failed\n");
acpi_terminate();
return -1;
}
return 0;
}
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