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authorErwan Velu <erwan.velu@zodiacaerospace.com>2012-09-10 17:05:03 +0200
committerErwan Velu <erwanaliasr1@gmail.com>2012-09-10 20:20:06 +0200
commitbdc83b0e517fbb662e8d8b02c5cf638c460dfffc (patch)
treebfb3115a2ce64b633c99f9eed668e366cf171151 /com32/modules
parent6c64333eb0ad592a96124f48648f048b4de964f1 (diff)
downloadsyslinux-bdc83b0e517fbb662e8d8b02c5cf638c460dfffc.tar.gz
syslinux-bdc83b0e517fbb662e8d8b02c5cf638c460dfffc.tar.xz
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kontron_wdt: Adding watchdog com32 module
When using a Kontron ETX board, it's possible to initialize and start the watchdog during syslinux booting. This allow protecting a boot sequence with a defined timeout. Bootloader is starting, engage the watchdog and then start a default entry (typically a Linux image). If the loaded OS, feed or reinitalize the watchdog, nothing occurs unless the system will reboot Conflicts: com32/modules/Makefile
Diffstat (limited to 'com32/modules')
-rw-r--r--com32/modules/Makefile2
-rw-r--r--com32/modules/kontron_wdt.c407
-rw-r--r--com32/modules/kontron_wdt.h117
3 files changed, 525 insertions, 1 deletions
diff --git a/com32/modules/Makefile b/com32/modules/Makefile
index d8861c48..30bf5252 100644
--- a/com32/modules/Makefile
+++ b/com32/modules/Makefile
@@ -24,7 +24,7 @@ MODULES = config.c32 ethersel.c32 dmitest.c32 cpuidtest.c32 \
meminfo.c32 sdi.c32 sanboot.c32 ifcpu64.c32 vesainfo.c32 \
kbdmap.c32 cmd.c32 vpdtest.c32 host.c32 ls.c32 gpxecmd.c32 \
ifcpu.c32 cpuid.c32 cat.c32 pwd.c32 ifplop.c32 zzjson.c32 \
- whichsys.c32 pxechn.c32
+ whichsys.c32 pxechn.c32 kontron_wdt.c23
TESTFILES =
diff --git a/com32/modules/kontron_wdt.c b/com32/modules/kontron_wdt.c
new file mode 100644
index 00000000..46d37d0f
--- /dev/null
+++ b/com32/modules/kontron_wdt.c
@@ -0,0 +1,407 @@
+/*
+ * kempld_wdt.c - Kontron PLD watchdog driver
+ *
+ * Copyright (c) 2010 Kontron Embedded Modules GmbH
+ * Author: Michael Brunner <michael.brunner@kontron.com>
+ * Author: Erwan Velu <erwan.velu@zodiacaerospace.com>
+ *
+ * Note: From the PLD watchdog point of view timeout and pretimeout are
+ * defined differently than in the kernel.
+ * First the pretimeout stage runs out before the timeout stage gets
+ * active. This has to be kept in mind.
+ *
+ * Kernel/API: P-----| pretimeout
+ * |-----------------------T timeout
+ * Watchdog: |-----------------P pretimeout_stage
+ * |-----T timeout_stage
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 2 as published
+ * by the Free Software Foundation.
+ *
+ * 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <string.h>
+#include <sys/io.h>
+#include <unistd.h>
+#include <syslinux/boot.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <console.h>
+#include "kontron_wdt.h"
+
+struct kempld_device_data pld;
+struct kempld_watchdog_data wdt;
+uint8_t status;
+char default_label[255];
+
+/* Default Timeout is 60sec */
+#define TIMEOUT 60
+#define PRETIMEOUT 0
+
+#define do_div(n,base) ({ \
+ int __res; \
+ __res = ((unsigned long) n) % (unsigned) base; \
+ n = ((unsigned long) n) / (unsigned) base; \
+ __res; })
+
+
+/* Basic Wrappers to get code as less changed as possible */
+void iowrite8(uint8_t val, uint16_t addr) { outb(val,addr); }
+void iowrite16(uint16_t val, uint16_t addr) { outw(val,addr); }
+void iowrite32(uint32_t val, uint16_t addr) { outl(val,addr);}
+uint8_t ioread8(uint16_t addr) { return inb(addr);}
+uint16_t ioread16(uint16_t addr) { return inw(addr);}
+uint32_t ioread32(uint32_t addr) { return inl(addr);}
+
+
+/**
+ * kempld_set_index - change the current register index of the PLD
+ * @pld: kempld_device_data structure describing the PLD
+ * @index: register index on the chip
+ *
+ * This function changes the register index of the PLD.
+ */
+void kempld_set_index(struct kempld_device_data *pld, uint8_t index)
+{
+ if (pld->last_index != index) {
+ iowrite8(index, pld->io_index);
+ pld->last_index = index;
+ }
+}
+
+
+uint8_t kempld_read8(struct kempld_device_data *pld, uint8_t index) {
+ kempld_set_index(pld, index);
+ return ioread8(pld->io_data);
+}
+
+
+void kempld_write8(struct kempld_device_data *pld, uint8_t index, uint8_t data) {
+ kempld_set_index(pld, index);
+ iowrite8(data, pld->io_data);
+}
+
+
+uint16_t kempld_read16(struct kempld_device_data *pld, uint8_t index)
+{
+ return kempld_read8(pld, index) | kempld_read8(pld, index+1) << 8;
+}
+
+
+void kempld_write16(struct kempld_device_data *pld, uint8_t index, uint16_t data)
+{
+ kempld_write8(pld, index, (uint8_t)data);
+ kempld_write8(pld, index+1, (uint8_t)(data>>8));
+}
+
+uint32_t kempld_read32(struct kempld_device_data *pld, uint8_t index)
+{
+ return kempld_read16(pld, index) | kempld_read16(pld, index+2) << 16;
+}
+
+void kempld_write32(struct kempld_device_data *pld, uint8_t index, uint32_t data)
+{
+ kempld_write16(pld, index, (uint16_t)data);
+ kempld_write16(pld, index+2, (uint16_t)(data>>16));
+}
+
+static void kempld_release_mutex(struct kempld_device_data *pld)
+{
+ iowrite8(pld->last_index | KEMPLD_MUTEX_KEY, pld->io_index);
+}
+
+void init_structure(void) {
+ /* set default values for the case we start the watchdog or change
+ * the configuration */
+ memset(&wdt,0,sizeof(wdt));
+ memset(&pld,0,sizeof(pld));
+ memset(&default_label,0,sizeof(default_label));
+ wdt.timeout = TIMEOUT;
+ wdt.pretimeout = PRETIMEOUT;
+ wdt.pld = &pld;
+
+ pld.io_base=KEMPLD_IOPORT;
+ pld.io_index=KEMPLD_IOPORT;
+ pld.io_data=KEMPLD_IODATA;
+ pld.pld_clock=33333333;
+}
+
+static int kempld_probe(void) {
+ /* Check for empty IO space */
+ int ret=0;
+ uint8_t index_reg = ioread8(pld.io_index);
+ if ((index_reg == 0xff) && (ioread8(pld.io_data) == 0xff)) {
+ ret = 1;
+ goto err_empty_io;
+ }
+ printf("Kempld structure found at 0x%X (data @ 0x%X)\n",pld.io_base,pld.io_data);
+ return 0;
+
+err_empty_io:
+ printf("No IO Found !\n");
+ return ret;
+}
+
+static int kempld_wdt_probe_stages(struct kempld_watchdog_data *wdt)
+{
+ struct kempld_device_data *pld = wdt->pld;
+ int i, ret;
+ uint32_t timeout;
+ uint32_t timeout_mask;
+ struct kempld_watchdog_stage *stage;
+
+ wdt->stages = 0;
+ wdt->timeout_stage = NULL;
+ wdt->pretimeout_stage = NULL;
+
+ for (i = 0; i < KEMPLD_WDT_MAX_STAGES; i++) {
+
+ timeout = kempld_read32(pld, KEMPLD_WDT_STAGE_TIMEOUT(i));
+ kempld_write32(pld, KEMPLD_WDT_STAGE_TIMEOUT(i), 0x00000000);
+ timeout_mask = kempld_read32(pld, KEMPLD_WDT_STAGE_TIMEOUT(i));
+ kempld_write32(pld, KEMPLD_WDT_STAGE_TIMEOUT(i), timeout);
+
+ if (timeout_mask != 0xffffffff) {
+ stage = malloc(sizeof(struct kempld_watchdog_stage));
+ if (stage == NULL) {
+ ret = -1;
+ goto err_alloc_stages;
+ }
+ stage->num = i;
+ stage->timeout_mask = ~timeout_mask;
+ wdt->stage[i] = stage;
+ wdt->stages++;
+
+ /* assign available stages to timeout and pretimeout */
+ if (wdt->stages == 1)
+ wdt->timeout_stage = stage;
+ else if (wdt->stages == 2) {
+ wdt->pretimeout_stage = wdt->timeout_stage;
+ wdt->timeout_stage = stage;
+ }
+ } else {
+ wdt->stage[i] = NULL;
+ }
+ }
+
+ return 0;
+err_alloc_stages:
+ kempld_release_mutex(pld);
+ printf("Cannot allocate stages\n");
+ return ret;
+}
+
+static int kempld_wdt_keepalive(struct kempld_watchdog_data *wdt)
+{
+ struct kempld_device_data *pld = wdt->pld;
+
+ kempld_write8(pld, KEMPLD_WDT_KICK, 'K');
+
+ return 0;
+}
+
+static int kempld_wdt_setstageaction(struct kempld_watchdog_data *wdt,
+ struct kempld_watchdog_stage *stage,
+ int action)
+{
+ struct kempld_device_data *pld = wdt->pld;
+ uint8_t stage_cfg;
+
+ if (stage == NULL)
+ return -1;
+
+ stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->num));
+ stage_cfg &= ~KEMPLD_WDT_STAGE_CFG_ACTION_MASK;
+ stage_cfg |= (action & KEMPLD_WDT_STAGE_CFG_ACTION_MASK);
+ if (action == KEMPLD_WDT_ACTION_RESET)
+ stage_cfg |= KEMPLD_WDT_STAGE_CFG_ASSERT;
+ else
+ stage_cfg &= ~KEMPLD_WDT_STAGE_CFG_ASSERT;
+
+ kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->num), stage_cfg);
+ stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->num));
+
+ return 0;
+}
+
+static int kempld_wdt_setstagetimeout(struct kempld_watchdog_data *wdt,
+ struct kempld_watchdog_stage *stage,
+ int timeout)
+{
+ struct kempld_device_data *pld = wdt->pld;
+ uint8_t stage_cfg;
+ uint8_t prescaler;
+ uint64_t stage_timeout64;
+ uint32_t stage_timeout;
+
+ if (stage == NULL)
+ return -1;
+
+ prescaler = KEMPLD_WDT_PRESCALER_21BIT;
+
+ stage_timeout64 = ((uint64_t)timeout*pld->pld_clock);
+ do_div(stage_timeout64, KEMPLD_PRESCALER(prescaler));
+ stage_timeout = stage_timeout64 & stage->timeout_mask;
+
+ if (stage_timeout64 != (uint64_t)stage_timeout)
+ return -1;
+
+ stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->num));
+ stage_cfg &= ~KEMPLD_WDT_STAGE_CFG_PRESCALER_MASK;
+ stage_cfg |= KEMPLD_WDT_STAGE_CFG_SET_PRESCALER(prescaler);
+ kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->num), stage_cfg);
+ kempld_write32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->num),
+ stage_timeout);
+
+ return 0;
+}
+
+
+static int kempld_wdt_settimeout(struct kempld_watchdog_data *wdt)
+{
+ int stage_timeout;
+ int stage_pretimeout;
+ int ret;
+ if ((wdt->timeout <= 0) ||
+ (wdt->pretimeout < 0) ||
+ (wdt->pretimeout > wdt->timeout)) {
+ ret = -1;
+ goto err_check_values;
+ }
+
+ if ((wdt->pretimeout == 0) || (wdt->pretimeout_stage == NULL)) {
+ if (wdt->pretimeout != 0)
+ printf("No pretimeout stage available, only enabling reset!\n");
+ stage_pretimeout = 0;
+ stage_timeout = wdt->timeout;
+ } else {
+ stage_pretimeout = wdt->timeout - wdt->pretimeout;
+ stage_timeout = wdt->pretimeout;
+ }
+
+ if (stage_pretimeout != 0) {
+ ret = kempld_wdt_setstageaction(wdt, wdt->pretimeout_stage,
+ KEMPLD_WDT_ACTION_NMI);
+ } else if ((stage_pretimeout == 0)
+ && (wdt->pretimeout_stage != NULL)) {
+ ret = kempld_wdt_setstageaction(wdt, wdt->pretimeout_stage,
+ KEMPLD_WDT_ACTION_NONE);
+ } else
+ ret = 0;
+ if (ret)
+ goto err_setstage;
+
+ if (stage_pretimeout != 0) {
+ ret = kempld_wdt_setstagetimeout(wdt, wdt->pretimeout_stage,
+ stage_pretimeout);
+ if (ret)
+ goto err_setstage;
+ }
+
+ ret = kempld_wdt_setstageaction(wdt, wdt->timeout_stage,
+ KEMPLD_WDT_ACTION_RESET);
+ if (ret)
+ goto err_setstage;
+
+ ret = kempld_wdt_setstagetimeout(wdt, wdt->timeout_stage,
+ stage_timeout);
+ if (ret)
+ goto err_setstage;
+
+ return 0;
+err_setstage:
+err_check_values:
+ return ret;
+}
+
+static int kempld_wdt_start(struct kempld_watchdog_data *wdt)
+{
+ struct kempld_device_data *pld = wdt->pld;
+ uint8_t status;
+
+ status = kempld_read8(pld, KEMPLD_WDT_CFG);
+ status |= KEMPLD_WDT_CFG_ENABLE;
+ kempld_write8(pld, KEMPLD_WDT_CFG, status);
+ status = kempld_read8(pld, KEMPLD_WDT_CFG);
+
+ /* check if the watchdog was enabled */
+ if (!(status & KEMPLD_WDT_CFG_ENABLE))
+ return -1;
+
+ return 0;
+}
+
+/* A regular configuration file looks like
+
+ LABEL WDT
+ COM32 wdt.c32
+ APPEND timeout=120 default_label=local
+*/
+void detect_parameters(const int argc, const char *argv[]) {
+ for (int i = 1; i < argc; i++) {
+ /* Override the timeout if specified on the cmdline */
+ if (!strncmp(argv[i], "timeout=", 8)) {
+ wdt.timeout=atoi(argv[i]+8);
+ } else
+ /* Define which boot entry shall be used */
+ if (!strncmp(argv[i], "default_label=", 14)) {
+ strlcpy(default_label, argv[i] + 14, sizeof(default_label));
+ }
+ }
+}
+
+int main(int argc, const char *argv[]) {
+ int ret=0;
+ openconsole(&dev_rawcon_r, &dev_stdcon_w);
+ init_structure();
+ detect_parameters(argc,argv);
+ kempld_probe();
+
+ /* probe how many usable stages we have */
+ if (kempld_wdt_probe_stages(&wdt)) {
+ printf("Cannot Probe Stages\n");
+ return -1;
+ }
+
+ /* Useless but who knows */
+ wdt.ident.firmware_version = KEMPLD_WDT_REV_GET(kempld_read8(&pld, KEMPLD_WDT_REV));
+
+ status = kempld_read8(&pld, KEMPLD_WDT_CFG);
+ /* kick the watchdog if it is already enabled, otherwise start it */
+ if (status & KEMPLD_WDT_CFG_ENABLE) {
+ kempld_wdt_keepalive(&wdt);
+ } else {
+ ret = kempld_wdt_settimeout(&wdt);
+ if (ret) {
+ printf("Unable to setup timeout !\n");
+ kempld_release_mutex(&pld);
+ return -1;
+ }
+ ret = kempld_wdt_start(&wdt);
+ if (ret) {
+ printf("Unable to start watchdog !\n");
+ kempld_release_mutex(&pld);
+ return -1;
+ }
+
+ }
+
+ /* Release Mutex to let Linux's Driver taking control */
+ kempld_release_mutex(&pld);
+ printf("Watchog armed ! Rebooting in %d seconds if no feed occurs !\n",wdt.timeout);
+
+ /* Let's boot the default entry if specified */
+ if (strlen(default_label)>0) {
+ printf("Executing default label = '%s'\n",default_label);
+ syslinux_run_command(default_label);
+ }
+}
diff --git a/com32/modules/kontron_wdt.h b/com32/modules/kontron_wdt.h
new file mode 100644
index 00000000..e916de30
--- /dev/null
+++ b/com32/modules/kontron_wdt.h
@@ -0,0 +1,117 @@
+/*
+ * kempld_wdt.h - Kontron PLD watchdog driver definitions
+ *
+ * Copyright (c) 2010 Kontron Embedded Modules GmbH
+ * Author: Michael Brunner <michael.brunner@kontron.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 2 as published
+ * by the Free Software Foundation.
+ *
+ * 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _KEMPLD_WDT_H_
+#define _KEMPLD_WDT_H_
+#include <stdint.h>
+
+#define KEMPLD_IOPORT 0x0a80
+#define KEMPLD_IODATA (KEMPLD_IOPORT+1)
+
+#define KEMPLD_MUTEX_KEY 0x80
+
+/* watchdog register definitions */
+#define KEMPLD_WDT_KICK 0x16
+#define KEMPLD_WDT_REV 0x16
+#define KEMPLD_WDT_REV_GET(x) (x & 0xf)
+#define KEMPLD_WDT_CFG 0x17
+#define KEMPLD_WDT_CFG_STAGE_TIMEOUT_OCCURED(x) (1<<x)
+#define KEMPLD_WDT_CFG_ENABLE_LOCK 0x8
+#define KEMPLD_WDT_CFG_ENABLE 0x10
+#define KEMPLD_WDT_CFG_AUTO_RELOAD 0x40
+#define KEMPLD_WDT_CFG_GLOBAL_LOCK 0x80
+#define KEMPLD_WDT_STAGE_CFG(x) (0x18+x)
+#define KEMPLD_WDT_STAGE_CFG_ACTION_MASK 0x7
+#define KEMPLD_WDT_STAGE_CFG_GET_ACTION(x) (x & 0x7)
+#define KEMPLD_WDT_STAGE_CFG_ASSERT 0x8
+#define KEMPLD_WDT_STAGE_CFG_PRESCALER_MASK 0x30
+#define KEMPLD_WDT_STAGE_CFG_GET_PRESCALER(x) ((x & 0x30)>>4)
+#define KEMPLD_WDT_STAGE_CFG_SET_PRESCALER(x) ((x & 0x30)<<4)
+#define KEMPLD_WDT_STAGE_TIMEOUT(x) (0x1b+x*4)
+#define KEMPLD_WDT_MAX_STAGES 3
+
+#define KEMPLD_WDT_ACTION_NONE 0x0
+#define KEMPLD_WDT_ACTION_RESET 0x1
+#define KEMPLD_WDT_ACTION_NMI 0x2
+#define KEMPLD_WDT_ACTION_SMI 0x3
+#define KEMPLD_WDT_ACTION_SCI 0x4
+#define KEMPLD_WDT_ACTION_DELAY 0x5
+
+#define KEMPLD_WDT_PRESCALER_21BIT 0x0
+#define KEMPLD_WDT_PRESCALER_17BIT 0x1
+#define KEMPLD_WDT_PRESCALER_12BIT 0x2
+
+const int kempld_prescaler_bits[] = { 21, 17, 12 };
+
+struct kempld_watchdog_stage {
+ int num;
+ uint32_t timeout_mask;
+};
+
+/**
+ * struct kempld_device_data - Internal representation of the PLD device
+ * @io_base: Pointer to the IO memory
+ * @io_index: Pointer to the IO index register
+ * @io_data: Pointer to the IO data register
+ * @pld_clock: PLD clock frequency
+ * @lock: PLD spin-lock
+ * @lock_flags: PLD spin-lock flags
+ * @have_mutex: Bool value that indicates if mutex is aquired
+ * @last_index: Last written index value
+ * @rscr: Kernel resource structure
+ * @dev: Pointer to kernel device structure
+ * @info: KEMPLD info structure
+ */
+struct kempld_device_data {
+ uint16_t io_base;
+ uint16_t io_index;
+ uint16_t io_data;
+ uint32_t pld_clock;
+/* spinlock_t lock;
+ unsigned long lock_flags; */
+ int have_mutex;
+ uint8_t last_index;
+/* struct resource rscr;
+ struct device *dev;
+ struct kempld_info info;*/
+};
+
+struct watchdog_info {
+ uint32_t options; /* Options the card/driver supports */
+ uint32_t firmware_version; /* Firmware version of the card */
+ uint8_t identity[32]; /* Identity of the board */
+};
+
+struct kempld_watchdog_data {
+ unsigned int revision;
+ int timeout;
+ int pretimeout;
+ unsigned long is_open;
+ unsigned long expect_close;
+ int stages;
+ struct kempld_watchdog_stage *timeout_stage;
+ struct kempld_watchdog_stage *pretimeout_stage;
+ struct kempld_device_data *pld;
+ struct kempld_watchdog_stage *stage[KEMPLD_WDT_MAX_STAGES];
+ struct watchdog_info ident;
+};
+
+#endif /* _KEMPLD_WDT_H_ */
+#define KEMPLD_PRESCALER(x) (0xffffffff>>(32-kempld_prescaler_bits[x]))