/** @file avm_reboot_status.c
 *
 * ########################################################################
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope 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.
 *
 * ########################################################################
 * mbahr:
 * 1.) hold and get reboot-status after Soft/NMI-Reboot
 * 2.) handle die-notifier
 * 3.) handle panic-notifier
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": reboot_status: " fmt

#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kmsg_dump.h>
#include <linux/pm.h>
#include <linux/avm_hw_config.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/kdebug.h>
#include <linux/signal.h>
#include <linux/interrupt.h>
#include <linux/nmi.h>
#include <linux/avm_reboot_status.h>
#include <linux/simple_proc.h>
#include <linux/proc_fs.h>
#include <linux/tffs.h>
#include <asm/mach_avm.h>

#if defined(CONFIG_AVM_FASTIRQ)
#if defined (CONFIG_AVM_FASTIRQ_ARCH_ARM_COMMON)
#include <asm/avm_enh/avm_fiq_os.h>
#else
#include <mach/avm_fiq_os.h>
#endif
#endif/*--- #if defined(CONFIG_AVM_FASTIRQ) ---*/
#include "avm_sammel.h"

#if defined(CONFIG_SOC_GRX500)
#include "arch_avm_reboot_status_grx.h"
#endif/*--- #if defined(CONFIG_SOC_GRX500) ---*/

#if defined(CONFIG_VR9) || defined(CONFIG_AR10)
#include "arch_avm_reboot_status_ifx.h"
#endif/*--- #if defined(CONFIG_VR9) || defined(CONFIG_AR10) ---*/

#if defined(CONFIG_MACH_PUMA6)
#include "arch_avm_reboot_status_puma6a.h"
#elif defined(CONFIG_X86) && !defined(CONFIG_X86_PUMA7)
#include "arch_avm_reboot_status_puma6x.h"
#elif defined(CONFIG_MACH_PUMA7)

#if defined(CONFIG_X86_PUMA7)
#include "arch_avm_reboot_status_puma7x.h"
#else
#include "arch_avm_reboot_status_puma7.h"
#endif

#endif

#if defined(CONFIG_MACH_BCM963138)
#include "arch_avm_reboot_status_brcma.h"
#endif/*--- #if defined(CONFIG_MACH_BCM963138) ---*/

#if defined(CONFIG_MACH_BCM963138)
#include "arch_avm_reboot_status_brcma.h"
#endif/*--- #if defined(CONFIG_MACH_BCM963138) ---*/

#if defined(CONFIG_ARCH_IPQ40XX)
#include "arch_avm_reboot_status_ipq40xx.h"
#endif/*--- #if defined(CONFIG_ARCH_IPQ40XX)  ---*/

#if defined(CONFIG_SOC_AR724X) || defined(CONFIG_SOC_AR934X) || defined(CONFIG_SOC_QCA955X) || defined(CONFIG_SOC_QCA953X) || defined(CONFIG_SOC_QCA956X)
#include "arch_avm_reboot_status_scrpn.h"
#endif/*--- #if defined(CONFIG_SOC_AR724X) || defined(CONFIG_SOC_AR934X) || defined(CONFIG_SOC_QCA955X) || defined(CONFIG_SOC_QCA953X) || defined(CONFIG_SOC_QCA956X)  ---*/

static enum _avm_reset_status avm_reboot_status;
/**--------------------------------------------------------------------------------**\
\brief Deliver last reboot-status
\**--------------------------------------------------------------------------------**/
enum _avm_reset_status avm_reset_status(void){
	enum _avm_reset_status status;

	switch(avm_reboot_status) {
		case RS_PANIC:
		case RS_OOM:
		case RS_OOPS:
			status = RS_REBOOT;
			break;
		default:
			status = avm_reboot_status;
	}
	return status;
}
EXPORT_SYMBOL(avm_reset_status);

struct _reboot_info {
	const enum _avm_reset_status status;
	const char *matchtext;
	int         matchlen;
	const char *printouttext;
	const char *shortprintouttext;
	unsigned int reboot_count;
};

static struct _reboot_info reboot_info[] = {
	{ status: RS_SOFTWATCHDOG,      matchtext: SOFTWATCHDOG_REBOOT_STATUS_TEXT, matchlen: sizeof(SOFTWATCHDOG_REBOOT_STATUS_TEXT), printouttext: "Softwatchdog-Reboot",   shortprintouttext: "WD"           },
	{ status: RS_NMIWATCHDOG,       matchtext: NMI_REBOOT_STATUS_TEXT,          matchlen: sizeof(NMI_REBOOT_STATUS_TEXT),          printouttext: "NMI-Watchdog-Reset",    shortprintouttext: "NMI"          },
	{ status: RS_FIRMWAREUPDATE,    matchtext: UPDATE_REBOOT_STATUS_TEXT,       matchlen: sizeof(UPDATE_REBOOT_STATUS_TEXT),       printouttext: "Fw-Update",             shortprintouttext:  NULL          },
	{ status: RS_SHORTREBOOT,       matchtext: POWERON_REBOOT_STATUS_TEXT,      matchlen: sizeof(POWERON_REBOOT_STATUS_TEXT),      printouttext: "Short-PowerOff-Reboot", shortprintouttext: "SHORTPOWERCUT"},
	{ status: RS_TEMP_REBOOT,       matchtext: TEMP_REBOOT_STATUS_TEXT,         matchlen: sizeof(TEMP_REBOOT_STATUS_TEXT),         printouttext: "Temperature-Reboot",    shortprintouttext: "TEMPERATURE"  },
	{ status: RS_REBOOT_FOR_UPDATE, matchtext: SOFT_REBOOT_STATUS_TEXT_UPDATE,  matchlen: sizeof(SOFT_REBOOT_STATUS_TEXT_UPDATE),  printouttext: "Update-Reboot",         shortprintouttext: "UPDATE"       },
	{ status: RS_PANIC,             matchtext: SOFT_REBOOT_STATUS_TEXT_PANIC,   matchlen: sizeof(SOFT_REBOOT_STATUS_TEXT_PANIC),   printouttext: "Soft-Reboot",           shortprintouttext: "PANIC"        },
	{ status: RS_OOM,               matchtext: SOFT_REBOOT_STATUS_TEXT_OOM,     matchlen: sizeof(SOFT_REBOOT_STATUS_TEXT_OOM),     printouttext: "Soft-Reboot",           shortprintouttext: "OOM"          },
	{ status: RS_OOPS,              matchtext: SOFT_REBOOT_STATUS_TEXT_OOPS,    matchlen: sizeof(SOFT_REBOOT_STATUS_TEXT_OOPS),    printouttext: "Soft-Reboot",           shortprintouttext: "KCRASH"       },
	/*--- als vorletzter Eintrag, da dieser Untermenge von RS_PANIC/RS_OOM/RS_OOPS ---*/
	{ status: RS_REBOOT,            matchtext: SOFT_REBOOT_STATUS_TEXT,         matchlen: sizeof(SOFT_REBOOT_STATUS_TEXT),         printouttext: "Soft-Reboot",           shortprintouttext: NULL           },
	/*--- definition: have to be last entry: ---*/
	{ status: RS_POWERON,           matchtext: NULL,                            matchlen: 0,                                       printouttext: "Power-On",              shortprintouttext: NULL   },
};

/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static void read_reboot_counters(char *txt) {
	char *p;
	unsigned int i, control, sum = 0;
	unsigned int counter[ARRAY_SIZE(reboot_info)];

	for(i = 0; i < ARRAY_SIZE(reboot_info); i++) {
		counter[i] = 0;
		if (reboot_info[i].shortprintouttext && (p = strstr(txt, reboot_info[i].shortprintouttext))) {
			p += strlen(reboot_info[i].shortprintouttext) + 1; /*--- inklusive ( ---*/
			sscanf(p, "%u", &counter[i]);
			sum += counter[i];
		}
	}
	if ((p = strstr(txt, "SUM"))) {
		p += sizeof("SUM"); /*--- inklusive ( ---*/
		sscanf(p, "%u", &control);
		if (control == sum) {
			for(i = 0; i < ARRAY_SIZE(reboot_info); i++) {
				reboot_info[i].reboot_count = counter[i];
			}
		}
	}
}
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static void write_reboot_counters(char *txt, int maxlen) {
	unsigned int i, sum = 0, len;
	txt[0] = 0;
	for(i = 0; i < ARRAY_SIZE(reboot_info); i++) {
		if (reboot_info[i].shortprintouttext && reboot_info[i].reboot_count) {
			sum += reboot_info[i].reboot_count;
			len = snprintf(txt, maxlen, " %s(%u) ", reboot_info[i].shortprintouttext,
					reboot_info[i].reboot_count);
			if (len >= (unsigned int)maxlen) {
			   return;
			}
			maxlen -= len, txt += len;
		}
	}
	if (sum) {
		snprintf(txt, maxlen, "SUM(%u)", sum);
	}
}
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static void clear_reboot_counters(void) {
	unsigned int i;
	for(i = 0; i < ARRAY_SIZE(reboot_info); i++) {
		reboot_info[i].reboot_count = 0;
	}
}
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static unsigned int sum_reboot_counters(void) {
	unsigned int i, sum = 0;
	for(i = 0; i < ARRAY_SIZE(reboot_info); i++) {
		if (reboot_info[i].shortprintouttext) {
			sum += reboot_info[i].reboot_count;
		}
	}
	return sum;
}
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static int get_fieldindex_by_status(enum _avm_reset_status status) {
	unsigned int i;
	for(i = 0; i < ARRAY_SIZE(reboot_info); i++) {
		if (reboot_info[i].status == status) {
			return i;
		}
	}
	return -1;
}
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
void avm_rebootcounter_reset(void){
	clear_reboot_counters();
}
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
char *avm_rebootcounter_string(char *txt, unsigned int maxlen){
	char *start = txt;
	unsigned int i, len;
	start[0] = 0;
	if (sum_reboot_counters() == 0) {
		return start;
	}
	len = snprintf(txt, maxlen, "Irregular Reboots: SUM(%u) - ", sum_reboot_counters());
	if (len >= maxlen) {
	   return start;
	}
	maxlen -= len, txt += len;
	for(i = 0; i < ARRAY_SIZE(reboot_info); i++) {
		if (reboot_info[i].shortprintouttext && reboot_info[i].reboot_count) {
			len = snprintf(txt, maxlen, "%s(%u) ", reboot_info[i].shortprintouttext,
					reboot_info[i].reboot_count);
			if (len >= maxlen) {
			   return start;
			}
			maxlen -= len, txt += len;
		}
	}
	return start;
}

/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static void set_reboot_status(int nofix, enum _avm_reset_status status) {
	int idx;
	const char *text = "-----";
	unsigned int len = strlen(text) + 1;
	static const char *reboot_cause_written = NULL;
	char *mailbox = (char *)arch_get_mailbox();
	if (mailbox == NULL) {
		return;
	}
	/*--- only if not valid set before: ---*/
	if (reboot_cause_written != NULL) {
		return;
	}
	if ((status == RS_REBOOT) && oops_in_progress) {
		status = RS_OOPS;
	}
	idx = get_fieldindex_by_status(status);
	if (idx < 0) {
		return;
	}
	if (reboot_info[idx].matchtext) {
		text    = reboot_info[idx].matchtext;
		len     = reboot_info[idx].matchlen;
	}
	if (nofix == 0){
		reboot_cause_written = text;
		/*--------------------------------------------------------------------------------*\
		 * Reboot-Counter updaten/loeschen
		\*--------------------------------------------------------------------------------*/
		switch(status) {
			case  RS_REBOOT:
				clear_reboot_counters();
				break;
			case RS_FIRMWAREUPDATE:
				clear_reboot_counters();
				break;
			default:
				if (reboot_info[idx].shortprintouttext) {
					reboot_info[idx].reboot_count++;
				}
				break;
		}
	}
	#if !defined(CONFIG_X86_PUMA7)
	memcpy(mailbox, text, min(511U, len));
	#else
	arch_set_mailbox_msg(text);
	#endif
	write_reboot_counters(&mailbox[len + 1], 511 - len); /*--- dazwischen nullterminiert ---*/

	arch_flush_mailbox(mailbox, 512U - 1U);

	if (nofix == 0){
		printk(KERN_ERR"%s: %s%s%s%s%s%s\n", __func__,
			reboot_info[idx].printouttext,
			reboot_info[idx].shortprintouttext ? "(": "",
			reboot_info[idx].shortprintouttext ? reboot_info[idx].shortprintouttext : "",
			reboot_info[idx].shortprintouttext ? ") ": " ",
			mailbox[len + 1] ? " - " : "",
			&mailbox[len + 1]);
	}
}
/**--------------------------------------------------------------------------------**\
 \brief set actual reboot-status once - following settings will be ignored.
 special case: status = RS_POWERON - it happens as a cold-start
 (PCMCR-workarround for GRX)
 \param status reboot-status
\**--------------------------------------------------------------------------------**/
void avm_set_reset_status(enum _avm_reset_status status){

	if (status == RS_POWERON) {
		set_reboot_status(1, RS_POWERON);
		return;
	}
	set_reboot_status(0, status);
}
EXPORT_SYMBOL(avm_set_reset_status);

/**--------------------------------------------------------------------------------**\
\**--------------------------------------------------------------------------------**/
static int avm_reboot_handler(struct notifier_block *nb, unsigned long event, void *buf);
static struct notifier_block avm_reboot_notifier = {
	.notifier_call = avm_reboot_handler,   /* callback   */
	.priority	   = INT_MAX
};
/**--------------------------------------------------------------------------------**\
\**--------------------------------------------------------------------------------**/
static int avm_reboot_handler(struct notifier_block *nb __maybe_unused, unsigned long event __maybe_unused,
							  void *buf __maybe_unused){
	printk_avm_console_bend(0); /* force serial-output */
	avm_set_reset_status(RS_REBOOT);
	avm_stack_check(NULL);
	return NOTIFY_DONE;
}
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
#if defined(CONFIG_AVM_FASTIRQ)
#ifdef CONFIG_ARCH_QCOM
void avm_set_crashed_cpu(int cpu)
{
   SET_CRASHED_CPU(cpu);
}
int avm_get_crashed_cpu(void)
{
   return(GET_CRASHED_CPU());
}
#endif/*--- #ifdef CONFIG_ARCH_QCOM ---*/
#endif/*--- #ifdef CONFIG_AVM_FASTIRQ ---*/
static int panic_handler(struct notifier_block *notifier_block, unsigned long event, void *cause_string);
static struct notifier_block panic_notifier = {
	.notifier_call = panic_handler,
	.next          = NULL,
	.priority	   = 0
};
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static int panic_handler(struct notifier_block *notifier_block __maybe_unused, unsigned long event __maybe_unused,
						 void *cause_string __maybe_unused) {
	console_verbose();
	avm_set_reset_status(RS_PANIC);
	avm_stack_check(NULL);
	avm_oom_show_memstat(0x1); /* show memory depend on situation */
	printk_avm_console_bend(0); /*--- force serial output ---*/
#if defined(arch_panic_notifier)
	return arch_panic_notifier(notifier_block, event, cause_string);
#else/*--- #if #defined(arch_panic_notifier) ---*/
	return NOTIFY_DONE;
#endif/*--- #else ---*//*--- #if #defined(arch_panic_notifier) ---*/
}
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static int die_notifier(struct notifier_block *self, unsigned long cmd, void *ptr);
static struct notifier_block die_nb = {
	.notifier_call = die_notifier,
	.priority      = 0,
};
/*--------------------------------------------------------------------------------*\
\*--------------------------------------------------------------------------------*/
static int die_notifier(struct notifier_block *self __maybe_unused, unsigned long cmd __maybe_unused,
						void *ptr __maybe_unused) {
	console_verbose();
	avm_set_reset_status(RS_OOPS);
	avm_stack_check(NULL);
#if defined(arch_die_notifier)
	return arch_die_notifier(self, cmd, ptr);
#else
	return NOTIFY_OK;
#endif/*--- #if #defined(arch_die_notifier) ---*/
}
/**--------------------------------------------------------------------------------**\
 * \brief initial function called over arch_initcall-chain of linux-os
 * get the last reboot-status from architecture-depend reboot-safe
 * further functions:
 *  - print out last reboot-status
 *  - initialize actual reboot-status to overwritable short-power-on
 *  - register die-notifier
 *  - register panic-notifier
\**--------------------------------------------------------------------------------**/
static __init int get_reboot_status(void) {
	unsigned int i, len;
	char Buffer[512];
	char *mailbox = (char *) arch_get_mailbox();
	if (mailbox == NULL) {
		return 0;
	}
	memcpy(Buffer, mailbox, 512);
	Buffer[511] = '\0';
	/*--- printk(KERN_ERR"Raw-Reboot Status: '%s'\n", Buffer); ---*/
	for(i = 0; i < ARRAY_SIZE(reboot_info); i++) {
		if(reboot_info[i].matchtext == NULL) {
			break;
		}
		len = reboot_info[i].matchlen;
		if (memcmp(Buffer, reboot_info[i].matchtext, len) == 0) {
			read_reboot_counters(&Buffer[len]);
#if defined(ATH_NO_NMI)
			/*--- workarround - should be a nmi/freezer  ---*/
			if (reboot_info[i].status == RS_SHORTREBOOT) {
				int idx = get_fieldindex_by_status(RS_NMIWATCHDOG);
				if(idx >= 0) {
					char txt[128];
					unsigned long error_epc  = read_c0_errorepc();
					unsigned int sticky_reg = ath_reg_rd(ATH_RESET_BASE + ATH_RESET_REG_STICKY);
					i = idx;
					reboot_info[i].reboot_count++;
					snprintf(txt, sizeof(txt), "Maybe watchdog without log\nerror-epc=%pS\nsticky-reg=0x%08x\n",
							(void *)error_epc, sticky_reg);
					TFFS3_panic_dummy_log(txt);
				}
			}
#endif/*--- #if defined(ATH_NO_NMI) ---*/
			if (reboot_info[i].status == RS_SHORTREBOOT) {
				reboot_info[i].reboot_count++;
			}
			break;
		}
	}
	avm_reboot_status = reboot_info[i].status;
	printk(KERN_ERR"Reboot Status is: %s%s%s%s%s\n",
		reboot_info[i].printouttext,
		reboot_info[i].shortprintouttext ?  "(" : "",
		reboot_info[i].shortprintouttext ?  reboot_info[i].shortprintouttext : "",
		reboot_info[i].shortprintouttext ?  ") " : " ",
		avm_rebootcounter_string(Buffer, sizeof(Buffer)));
#if defined(ATH_NO_NMI)
	write_c0_errorepc(0x0);
#endif
	set_reboot_status(1, RS_SHORTREBOOT);
	register_die_notifier(&die_nb);
	atomic_notifier_chain_register(&panic_notifier_list, &panic_notifier);
	register_reboot_notifier(&avm_reboot_notifier);
	return 0;
}
#if defined(CONFIG_X86_PUMA7)
fs_initcall(get_reboot_status);
#else
arch_initcall(get_reboot_status);
#endif

static struct proc_dir_entry *rebootprocdir;
#define PROC_REBOOTDIR   "avm/reboot"
/**--------------------------------------------------------------------------------**\
\**--------------------------------------------------------------------------------**/
static void proc_reboot_info(struct seq_file *seq, void *priv __maybe_unused){
	char Buffer[512];
	int idx = get_fieldindex_by_status(avm_reboot_status);
	if (idx < 0) {
		return;
	}
	seq_printf(seq, "Reboot Status is: %s%s%s%s%s\n",
				reboot_info[idx].printouttext,
				reboot_info[idx].shortprintouttext ?  "(" : "",
				reboot_info[idx].shortprintouttext ?  reboot_info[idx].shortprintouttext : "",
				reboot_info[idx].shortprintouttext ?  ") " : " ",
				avm_rebootcounter_string(Buffer, sizeof(Buffer)));
}
/**--------------------------------------------------------------------------------**\
\**--------------------------------------------------------------------------------**/
static __init int proc_reboot_status(void) {
	rebootprocdir = proc_mkdir(PROC_REBOOTDIR, NULL);
	if (rebootprocdir == NULL) {
		return 0;
	}
	return add_simple_proc_file( "avm/reboot/info", NULL, proc_reboot_info, NULL);
}
late_initcall(proc_reboot_status);