linux-imx
Public
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committed 788c2fdb4f623
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* Ported driver to kernel 2.624
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* 20171016 Radu Rendec <rrendec@arista.com>25
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* Change driver to use the watchdog subsystem26
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* Add support for multiple 6300ESB devices27
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*/28
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/*30
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* Includes, defines, variables, module parameters, ...31
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*/32
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt34
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#include <linux/module.h>36
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#include <linux/types.h>37
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#include <linux/kernel.h>38
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#include <linux/fs.h>39
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#include <linux/mm.h>40
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#include <linux/miscdevice.h>41
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#include <linux/watchdog.h>42
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#include <linux/pci.h>43
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#include <linux/ioport.h>44
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#include <linux/uaccess.h>45
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#include <linux/io.h>46
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/* Module and version information */48
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#define ESB_VERSION "0.05"49
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#define ESB_MODULE_NAME "i6300ESB timer"50
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/* PCI configuration registers */52
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#define ESB_CONFIG_REG 0x60 /* Config register */53
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#define ESB_LOCK_REG 0x68 /* WDT lock register */54
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/* Memory mapped registers */56
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#define ESB_TIMER1_REG(w) ((w)->base + 0x00)/* Timer1 value after each reset */57
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#define ESB_TIMER2_REG(w) ((w)->base + 0x04)/* Timer2 value after each reset */58
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#define ESB_GINTSR_REG(w) ((w)->base + 0x08)/* General Interrupt Status Reg */69
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#define ESB_WDT_INTTYPE (0x03 << 0) /* Interrupt type on timer1 timeout */70
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/* Reload register bits */72
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#define ESB_WDT_TIMEOUT (0x01 << 9) /* Watchdog timed out */73
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#define ESB_WDT_RELOAD (0x01 << 8) /* prevent timeout */74
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/* Magic constants */76
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#define ESB_UNLOCK1 0x80 /* Step 1 to unlock reset registers */77
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#define ESB_UNLOCK2 0x86 /* Step 2 to unlock reset registers */78
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/* Probed devices counter; used only for printing the initial info message */80
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static int cards_found;81
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/* module parameters */83
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/* 30 sec default heartbeat (1 < heartbeat < 2*1023) */84
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#define ESB_HEARTBEAT_MIN 185
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#define ESB_HEARTBEAT_MAX 204686
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#define ESB_HEARTBEAT_DEFAULT 3087
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#define ESB_HEARTBEAT_RANGE __MODULE_STRING(ESB_HEARTBEAT_MIN) \88
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"<heartbeat<" __MODULE_STRING(ESB_HEARTBEAT_MAX)89
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static int heartbeat; /* in seconds */90
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module_param(heartbeat, int, 0);91
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MODULE_PARM_DESC(heartbeat,295
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/* And set the correct timeout value */296
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esb_timer_set_heartbeat(&edev->wdd, edev->wdd.timeout);297
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}298
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static int esb_probe(struct pci_dev *pdev,300
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const struct pci_device_id *ent)301
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{302
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struct esb_dev *edev;303
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int ret;304
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cards_found++;306
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if (cards_found == 1)307
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pr_info("Intel 6300ESB WatchDog Timer Driver v%s\n",308
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ESB_VERSION);309
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edev = devm_kzalloc(&pdev->dev, sizeof(*edev), GFP_KERNEL);311
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if (!edev)312
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return -ENOMEM;313
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/* Check whether or not the hardware watchdog is there */315
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edev->pdev = pdev;316
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if (!esb_getdevice(edev))317
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return -ENODEV;318
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/* Initialize the watchdog and make sure it does not run */