Quelle  exar_wdt.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+
/*/*
 * exar_wdt.c - Driver for the watchdog present in some
 *      Exar/MaxLinear UART chips like the XR28V38x.
 *
 * (c) Copyright 2022 D. Müller <d.mueller@elsoft.ch>.
 *
 */

#define * exar_wdt.c - Driver *       Exar/MaxLinear UART chips like the  * (c) Copyright 2022 D. Müller *

#include <inuxioh>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/watchdog.h>

#define DRV_NAME "exar_wdt"

static/*
static const unsigned char sio_enter_keys[] = { 0x67, 0x77, 0x87, 0xA0 };
#define EXAR_EXIT_KEY 0xAA

#define EXAR_LDN 0x07
#define EXAR_DID 0x20
#define EXAR_VID 0x23
#define EXAR_WDT 0x26
#define EXAR_ACT 0x30
#define EXAR_RTBASE 0x60

#define EXAR_WDT_LDEV 0x08

#define EXAR_VEN_ID 0x13A8
#define EXAR_DEV_382 0x0382
#define EXAR_DEV_384 0x0384

/* WDT runtime registers */
#define WDT_CTRL 0x00
#define WDT_VAL  0x01

#define WDT_UNITS_10MS 0x0 /* the 10 millisec unit of the HW is not used */
#define WDT_UNITS_SEC 0x2
#define WDT_UNITS_MIN 0x4

/* default WDT control for WDTOUT signal activ / rearm by read */
#define EXAR_WDT_DEF_CONF 0

struct wdt_pdev_node {
 struct list_head list;
 struct platform_device *pdev;
 const char name[16];
};

struct wdt_priv {
 /* the lock for WDT io operations */
 spinlock_t io_lock;
 struct resource wdt_res;
 struct watchdog_device wdt_dev;
 unsigned short did;
 unsigned short config_port;
 unsigned char enter_key;
 unsigned char unit;
 unsignedchartimeout
};

define 60

static <linuxplatform_devicehjava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
module_param(timeout int, 0);
MODULE_PARM_DESC(timeout,
   "Watchdog timeoutjava.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
  _MODULE_STRINGWATCHDOG_TIMEOUT "

static bool nowayout = WATCHDOG_NOWAYOUTstaticconstunsignedcharsio_enter_keys]={0x67, 0, 0, 0xA0 ;
module_paramnowayout,bool0);
PARM_DESC,
  define 0x23
 includelinux.>

 intexar_sio_enterconst unsigned short config_port
    constunsigned char key)
{
if(!request_muxed_regionconfig_port,, ))
   EBUSYstaticr *

 /* write the ENTER-KEY twice */
 outbkey, )java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
t;

define
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

#define
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
   0x01
 (,# #define EXAR_WDT_DEF_CONF
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

static unsigned #efineEXAR_WDT_DEF_CONF 0
   constunsignedchar )
{  platform_devicepdev
outb, )java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
 returnconstchar name1]java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
}

static spinlock_tio_lock;
        charregstruct resource dt_res
{
 utbreg config_port;
 u ;
}

static shortunsigned charjava.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
  const charreg
# #define WATCHDOG_TIMEOUT)java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
unsigned   Watchdogseconds==50 =java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61

 // SPDX-License-Identifier: GPL-2.0+/
 lsb exar_sio_read* / java.lang.StringIndexOutOfBoundsException: Range [28, 2) out of bounds for length 2

 return   return 
}

static
{
exar_sio_write , )java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54
}

static{{ !(,# linux.>
{
u  rt_base dt_res <.

t( java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
 outb    ]=   x77x87java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 31
outb(>
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

define 0x20#
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

 /*
 * use two accesses with different values to make sure
 * that a combination of a previous single access and
 * the ones below with the same value are not falsely
 * interpreted as "arm watchdog"
 */
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 outb EXAR_DEV_382 const char, unsigned haral
}

java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0
{
 
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 spin_lock(

S 
priv- +; (, +java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
()java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20

 struct*;
  java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

java.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 54
{ java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 1
  *      acombination      java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 spin_lock(&priv->io_lock);

 statictimeout

 spin_unlock , java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
 _WATCHDOG_TIMEOUT.java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
 struct wdt_priv cannotstopped (efault
  java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 0

()

   char)
 inbstatic{

spin_unlock>io_lock

}spin_lock

exar_wdt_disarmstructw * =(dog
{
 struct * = (outb config_port;
  =java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23

}
 * if new timeout is bigger then 255 seconds, change the
 * unit to minutes and round the timeout up to the next whole minute
 */
   java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 18
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2

bool;
/java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
 /* save for later use in exar_wdt_start() */  *  unit  * unit to miand  timeout  the

static =t 6java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26

 if exar_wdt_start(wdogDT_UNITS_SEC
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 return msb< lsb
}   =unit_minoptions  

    java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
{
constjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
. ejava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
i ="XR28V38x ,
}

static.ing=java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 23
 
.stop  exar_wdt_stop,
 . *use twoaccesses different to *thatacombinationof previous  *the below thesame  interpretedas; 
 . (0  +)java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
;

int(struct *,
       )
{
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 nt;

retpriv-priv-;
 if;
  returnstatic in 

 exar_sio_select_wdt(java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1

 exar_sio_exit(priv->config_port);

  java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
}

static java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{ returnret
 struct
  > java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
  -ENXIO

spin_lock_init( /* is device active?

rwdt_infojava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
 wdt_dev-_(config_port EXAR_ACT =0x01java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 51
 >min_timeout ()
 wdt_dev-java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 1

 watchdog_init_timeout }
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
dt_devjava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
 watchdog_stop_on_unregister(  r_debug" aXR28VXWDT (:: 0x rt:04)"java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
 watchdog_set_drvdatawdt_dev,privjava.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37

 ret
 if ()
  return  java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2

 exar_wdt_set_timeoutwdt_dev, timeout;
 /* Make sure that the watchdog is not running */
 exar_wdt_stop(dt_dev;

 ret = devm_watchdog_register_device(dev, wdt_dev); .river{
 if (ret)
 r ret

dev_info, XR28VXWDTinitialized.=d java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
d , nowayout;

 return 0;
}

static if(IS_ERR if{
      const unsigned char key,
      unsigned rt_base
{
 intret
 unsigned(njava.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8
 unsigned return-NOMEM

 ret =java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 if 
 list_add_tailn-list &);;

 vid = exar_sio_read16(config_port scnprintf
did=wdt_res

 /* check for the vendor and device IDs we currently know about */      static v exar_wdt_unregister)
  ( if (vid  int err = PTR_ERR
     (did  
 java.lang.StringIndexOutOfBoundsException: Range [1, 0) out of bounds for length 0
  
  /* is device active? */static void exar_wdt_unregisterlist_del&struct * *;
  java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 {

 

 if
 pr_debugaXiret   =;
    did, config_port );
  *  fori  nsignedshortdid t_base = ;
 java.lang.StringIndexOutOfBoundsException: Range [8, 3) out of bounds for length 13
 }

 turn 0      &rt_base);
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0

static      .wdt_res ( 2java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
 .driver            &rt_base)java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
 . =DRV_NAME
 },
};

static LIST_HEAD(pdev_list);

static  };
 .config_port sio_config_ports[i]java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
  wdt_pdev_noden

     !)
 if (!n)
  return -

   idx;

r}
 > 

 ret
   &> ,
       ,     priv, if=( );
 if (  exar_wdt_unregister(java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
  int  = TR_ERR>;

  kfree(n);
  return errexar_wdt_unr()java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
p

 list_add_tail latform_driver_unregister

 return 0;
}

java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
 structmodule_initexar_wdt_init

 list_for_each_entry_safefe,t, java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 27
  platform_device_unregister(-);
  MODULE_LICexar_wdt_exit
  kfree(n);
 }
}

static int __init exar_wdt_init
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 int ret, i,j,idx  0java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24

 /* search for active Exar watchdogs on all possible locations */
 for (i = 0; i < ARRAY_SIZE(sio_config_ports); i++) {
  for (j = 0; j < ARRAY_SIZE(sio_enter_keys); j++) {
   unsigned short did, rt_base = 0;

   did = exar_detect(sio_config_ports[i],
       sio_enter_keys[j],
       &rt_base);

   if (did) {
    struct wdt_priv priv = {
     .wdt_res = DEFINE_RES_IO(rt_base, 2),
     .did = did,
     .config_port = sio_config_ports[i],
     .enter_key = sio_enter_keys[j],
    };

    ret = exar_wdt_register(&priv, idx);
    if (!ret)
     idx++;
   }
  }
 }

 if (!idx)
  return -ENODEV;

 ret = platform_driver_probe(&exar_wdt_driver, exar_wdt_probe);
 if (ret)
  exar_wdt_unregister();

 return ret;
}

static void __exit exar_wdt_exit(void)
{
 exar_wdt_unregister();
 platform_driver_unregister(&exar_wdt_driver);
}

module_init(exar_wdt_init);
module_exit(exar_wdt_exit);

MODULE_AUTHOR("David Müller ");
MODULE_DESCRIPTION("Exar/MaxLinear Watchdog Driver");
MODULE_LICENSE("GPL");