// SPDX-License-Identifier: GPL-2.0-only
/*
* interfaces to Chassis Codes via PDC (firmware)
*
* Copyright (C) 2002 Laurent Canet <canetl@esiee.fr>
* Copyright (C) 2002-2006 Thibaut VARENE <varenet@parisc-linux.org>
*
* TODO: poll chassis warns, trigger (configurable) machine shutdown when
* needed.
* Find out how to get Chassis warnings out of PAT boxes?
*/
#undef PDC_CHASSIS_DEBUG
#ifdef PDC_CHASSIS_DEBUG
#define DPRINTK(fmt, args...) printk(fmt, ## args)
#else
#define DPRINTK(fmt, args...)
#endif
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/panic_notifier.h>
#include <linux/reboot.h>
#include <linux/notifier.h>
#include <linux/cache.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/pdc_chassis.h>
#include <asm/processor.h>
#include <asm/pdc.h>
#include <asm/pdcpat.h>
#include <asm/led.h>
#define PDC_CHASSIS_VER "0.05"
#ifdef CONFIG_PDC_CHASSIS
static unsigned int pdc_chassis_enabled __read_mostly = 1;
/**
* pdc_chassis_setup() - Enable/disable pdc_chassis code at boot time.
* @str: configuration param: 0 to disable chassis log
* @return 1
*/
static int __init pdc_chassis_setup(char *str)
{
/*panic_timeout = simple_strtoul(str, NULL, 0);*/
get_option(&str, &pdc_chassis_enabled);
return 1;
}
__setup("pdcchassis=", pdc_chassis_setup);
/**
* pdc_chassis_checkold() - Checks for old PDC_CHASSIS compatibility
*
* Currently, only E class and A180 are known to work with this.
* Inspired by Christoph Plattner
*/
#if 0
static void __init pdc_chassis_checkold(void)
{
switch(CPU_HVERSION) {
case 0x480: /* E25 */
case 0x481: /* E35 */
case 0x482: /* E45 */
case 0x483: /* E55 */
case 0x516: /* A180 */
break;
default:
break;
}
DPRINTK(KERN_DEBUG "%s: pdc_chassis_checkold(); pdc_chassis_old = %d\n", __FILE__, pdc_chassis_old);
}
#endif
/**
* pdc_chassis_panic_event() - Called by the panic handler.
* @this: unused
* @event: unused
* @ptr: unused
*
* As soon as a panic occurs, we should inform the PDC.
*/
static int pdc_chassis_panic_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
return NOTIFY_DONE;
}
static struct notifier_block pdc_chassis_panic_block = {
.notifier_call = pdc_chassis_panic_event,
.priority = INT_MAX,
};
/**
* pdc_chassis_reboot_event() - Called by the reboot handler.
* @this: unused
* @event: unused
* @ptr: unused
*
* As soon as a reboot occurs, we should inform the PDC.
*/
static int pdc_chassis_reboot_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
return NOTIFY_DONE;
}
static struct notifier_block pdc_chassis_reboot_block = {
.notifier_call = pdc_chassis_reboot_event,
.priority = INT_MAX,
};
#endif /* CONFIG_PDC_CHASSIS */
/**
* parisc_pdc_chassis_init() - Called at boot time.
*/
void __init parisc_pdc_chassis_init(void)
{
#ifdef CONFIG_PDC_CHASSIS
if (likely(pdc_chassis_enabled)) {
DPRINTK(KERN_DEBUG "%s: parisc_pdc_chassis_init()\n", __FILE__);
/* Let see if we have something to handle... */
printk(KERN_INFO "Enabling %s chassis codes support v%s\n",
is_pdc_pat() ? "PDC_PAT" : "regular",
PDC_CHASSIS_VER);
/* initialize panic notifier chain */
atomic_notifier_chain_register(&panic_notifier_list,
&pdc_chassis_panic_block);
/* initialize reboot notifier chain */
register_reboot_notifier(&pdc_chassis_reboot_block);
}
#endif /* CONFIG_PDC_CHASSIS */
}
/**
* pdc_chassis_send_status() - Sends a predefined message to the chassis,
* and changes the front panel LEDs according to the new system state
* @message: Type of message, one of PDC_CHASSIS_DIRECT_* values.
*
* Only machines with 64 bits PDC PAT and those reported in
* pdc_chassis_checkold() are supported atm.
*
* returns 0 if no error, -1 if no supported PDC is present or invalid message,
* else returns the appropriate PDC error code.
*
* For a list of predefined messages, see asm-parisc/pdc_chassis.h
*/
int pdc_chassis_send_status(int message)
{
/* Maybe we should do that in an other way ? */
int retval = 0;
#ifdef CONFIG_PDC_CHASSIS
if (likely(pdc_chassis_enabled)) {
DPRINTK(KERN_DEBUG "%s: pdc_chassis_send_status(%d)\n", __FILE__, message);
#ifdef CONFIG_64BIT
if (is_pdc_pat()) {
switch(message) {
case PDC_CHASSIS_DIRECT_BSTART:
retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BSTART, PDC_CHASSIS_LSTATE_RUN_NORMAL);
break;
case PDC_CHASSIS_DIRECT_BCOMPLETE:
retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_BCOMPLETE, PDC_CHASSIS_LSTATE_RUN_NORMAL);
break;
case PDC_CHASSIS_DIRECT_SHUTDOWN:
retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_SHUTDOWN, PDC_CHASSIS_LSTATE_NONOS);
break;
case PDC_CHASSIS_DIRECT_PANIC:
retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_PANIC, PDC_CHASSIS_LSTATE_RUN_CRASHREC);
break;
case PDC_CHASSIS_DIRECT_LPMC:
retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_LPMC, PDC_CHASSIS_LSTATE_RUN_SYSINT);
break;
case PDC_CHASSIS_DIRECT_HPMC:
retval = pdc_pat_chassis_send_log(PDC_CHASSIS_PMSG_HPMC, PDC_CHASSIS_LSTATE_RUN_NCRIT);
break;
default:
retval = -1;
}
} else retval = -1;
#else
if (1) {
switch (message) {
case PDC_CHASSIS_DIRECT_BSTART:
retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_INIT));
break;
case PDC_CHASSIS_DIRECT_BCOMPLETE:
retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_RUN));
break;
case PDC_CHASSIS_DIRECT_SHUTDOWN:
retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_SHUT));
break;
case PDC_CHASSIS_DIRECT_HPMC:
case PDC_CHASSIS_DIRECT_PANIC:
retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_FLT));
break;
case PDC_CHASSIS_DIRECT_LPMC:
retval = pdc_chassis_disp(PDC_CHASSIS_DISP_DATA(OSTAT_WARN));
break;
default:
retval = -1;
}
} else retval = -1;
#endif /* CONFIG_64BIT */
} /* if (pdc_chassis_enabled) */
/* if system has LCD display, update current string */
if (retval != -1 && IS_ENABLED(CONFIG_CHASSIS_LCD_LED))
lcd_print(NULL);
#endif /* CONFIG_PDC_CHASSIS */
return retval;
}
#ifdef CONFIG_PDC_CHASSIS_WARN
#ifdef CONFIG_PROC_FS
static int pdc_chassis_warn_show(struct seq_file *m, void *v)
{
unsigned long warn;
u32 warnreg;
if (pdc_chassis_warn(&warn) != PDC_OK)
return -EIO;
warnreg = (warn & 0xFFFFFFFF);
if ((warnreg >> 24) & 0xFF)
seq_printf(m, "Chassis component failure! (eg fan or PSU): 0x%.2x\n",
(warnreg >> 24) & 0xFF);
seq_printf(m, "Battery: %s\n", (warnreg & 0x04) ? "Low!" : "OK");
seq_printf(m, "Temp low: %s\n", (warnreg & 0x02) ? "Exceeded!" : "OK");
seq_printf(m, "Temp mid: %s\n", (warnreg & 0x01) ? "Exceeded!" : "OK");
return 0;
}
static int __init pdc_chassis_create_procfs(void)
{
unsigned long test;
int ret;
ret = pdc_chassis_warn(&test);
if ((ret == PDC_BAD_PROC) || (ret == PDC_BAD_OPTION)) {
/* seems that some boxes (eg L1000) do not implement this */
printk(KERN_INFO "Chassis warnings not supported.\n");
return 0;
}
printk(KERN_INFO "Enabling PDC chassis warnings support v%s\n",
PDC_CHASSIS_VER);
proc_create_single("chassis", 0400, NULL, pdc_chassis_warn_show);
return 0;
}
__initcall(pdc_chassis_create_procfs);
#endif /* CONFIG_PROC_FS */
#endif /* CONFIG_PDC_CHASSIS_WARN */