^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * integrated watchdog.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * provide warranty for any of this software. This material is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * provided "AS-IS" and at no charge.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Includes, defines, variables, module parameters, ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /* Includes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/module.h> /* For module specific items */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/moduleparam.h> /* For new moduleparam's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/types.h> /* For standard types (like size_t) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/errno.h> /* For the -ENODEV/... values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/kernel.h> /* For printk/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/miscdevice.h> /* For struct miscdevice */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/watchdog.h> /* For the watchdog specific items */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/init.h> /* For __init/__exit/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/fs.h> /* For file operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/platform_device.h> /* For platform_driver framework */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/ioport.h> /* For io-port access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/io.h> /* For inb/outb/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* Module and version information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define DRV_NAME "sch311x_wdt"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /* Runtime registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define GP60 0x47
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define WDT_TIME_OUT 0x65
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define WDT_VAL 0x66
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define WDT_CFG 0x67
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define WDT_CTRL 0x68
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* internal variables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static unsigned long sch311x_wdt_is_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static char sch311x_wdt_expect_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static struct platform_device *sch311x_wdt_pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static struct { /* The devices private data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* the Runtime Register base address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) unsigned short runtime_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /* The card's boot status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) int boot_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /* the lock for io operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) spinlock_t io_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) } sch311x_wdt_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /* Module load parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static unsigned short force_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) module_param(force_id, ushort, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) MODULE_PARM_DESC(force_id, "Override the detected device ID");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) module_param(timeout, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) MODULE_PARM_DESC(timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) "Watchdog timeout in seconds. 1<= timeout <=15300, default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) MODULE_PARM_DESC(nowayout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * Super-IO functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static inline void sch311x_sio_enter(int sio_config_port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) outb(0x55, sio_config_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static inline void sch311x_sio_exit(int sio_config_port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) outb(0xaa, sio_config_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static inline int sch311x_sio_inb(int sio_config_port, int reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) outb(reg, sio_config_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return inb(sio_config_port + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) outb(reg, sio_config_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) outb(val, sio_config_port + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * Watchdog Operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static void sch311x_wdt_set_timeout(int t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unsigned char timeout_unit = 0x80;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* When new timeout is bigger then 255 seconds, we will use minutes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (t > 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) timeout_unit = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) t /= 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* -- Watchdog Timeout --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * Bit 0-6 (Reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * Bit 7 WDT Time-out Value Units Select
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * (0 = Minutes, 1 = Seconds)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /* -- Watchdog Timer Time-out Value --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * Bit 0-7 Binary coded units (0=Disabled, 1..255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static void sch311x_wdt_start(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) unsigned char t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) spin_lock(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* set watchdog's timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) sch311x_wdt_set_timeout(timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /* enable the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* -- General Purpose I/O Bit 6.0 --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * Bit 0, In/Out: 0 = Output, 1 = Input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * Bit 1, Polarity: 0 = No Invert, 1 = Invert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * 10 = Either Edge Triggered Intr.4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * Bit 4-6 (Reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) t = inb(sch311x_wdt_data.runtime_reg + GP60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) outb((t & ~0x0d) | 0x0c, sch311x_wdt_data.runtime_reg + GP60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) spin_unlock(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static void sch311x_wdt_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) unsigned char t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) spin_lock(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /* stop the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) t = inb(sch311x_wdt_data.runtime_reg + GP60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) outb((t & ~0x0d) | 0x01, sch311x_wdt_data.runtime_reg + GP60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* disable timeout by setting it to 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) sch311x_wdt_set_timeout(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) spin_unlock(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static void sch311x_wdt_keepalive(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) spin_lock(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) sch311x_wdt_set_timeout(timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) spin_unlock(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static int sch311x_wdt_set_heartbeat(int t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (t < 1 || t > (255*60))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /* When new timeout is bigger then 255 seconds,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * we will round up to minutes (with a max of 255) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (t > 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) t = (((t - 1) / 60) + 1) * 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) timeout = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static void sch311x_wdt_get_status(int *status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) unsigned char new_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) *status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) spin_lock(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /* -- Watchdog timer control --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occurred
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * Bit 1 Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * Bit 3 P20 Force Timeout enabled:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * 0 = P20 activity does not generate the WD timeout event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * 1 = P20 Allows rising edge of P20, from the keyboard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * controller, to force the WD timeout event.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * Bit 4-7 Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (new_status & 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) *status |= WDIOF_CARDRESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) spin_unlock(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * /dev/watchdog handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static ssize_t sch311x_wdt_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) sch311x_wdt_expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) for (i = 0; i != count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (get_user(c, buf + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) sch311x_wdt_expect_close = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) sch311x_wdt_keepalive();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) int new_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) int __user *p = argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static const struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) .options = WDIOF_KEEPALIVEPING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) WDIOF_SETTIMEOUT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) .firmware_version = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) .identity = DRV_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (copy_to_user(argp, &ident, sizeof(ident)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) sch311x_wdt_get_status(&status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return put_user(status, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return put_user(sch311x_wdt_data.boot_status, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) case WDIOC_SETOPTIONS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int options, retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (get_user(options, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (options & WDIOS_DISABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) sch311x_wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (options & WDIOS_ENABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) sch311x_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) sch311x_wdt_keepalive();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (get_user(new_timeout, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (sch311x_wdt_set_heartbeat(new_timeout))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) sch311x_wdt_keepalive();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return put_user(timeout, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static int sch311x_wdt_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) if (test_and_set_bit(0, &sch311x_wdt_is_open))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * Activate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) sch311x_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) static int sch311x_wdt_close(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (sch311x_wdt_expect_close == 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) sch311x_wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) pr_crit("Unexpected close, not stopping watchdog!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) sch311x_wdt_keepalive();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) clear_bit(0, &sch311x_wdt_is_open);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) sch311x_wdt_expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * Kernel Interfaces
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static const struct file_operations sch311x_wdt_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) .write = sch311x_wdt_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) .unlocked_ioctl = sch311x_wdt_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) .open = sch311x_wdt_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) .release = sch311x_wdt_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) static struct miscdevice sch311x_wdt_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) .fops = &sch311x_wdt_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * Init & exit routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) static int sch311x_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) spin_lock_init(&sch311x_wdt_data.io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) sch311x_wdt_data.runtime_reg + GP60,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) sch311x_wdt_data.runtime_reg + GP60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) DRV_NAME)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) sch311x_wdt_data.runtime_reg + WDT_TIME_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) sch311x_wdt_data.runtime_reg + WDT_CTRL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) goto exit_release_region;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /* Make sure that the watchdog is not running */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) sch311x_wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) /* Disable keyboard and mouse interaction and interrupt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) /* -- Watchdog timer configuration --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) * Bit 0 Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * Bit 3 Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) /* Check that the heartbeat value is within it's range ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) * if not reset to the default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) if (sch311x_wdt_set_heartbeat(timeout)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) /* Get status at boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) sch311x_wdt_get_status(&sch311x_wdt_data.boot_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) sch311x_wdt_miscdev.parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) err = misc_register(&sch311x_wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (err != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) WATCHDOG_MINOR, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) goto exit_release_region2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) dev_info(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) "SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) timeout, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) exit_release_region2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) exit_release_region:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) sch311x_wdt_data.runtime_reg = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) static int sch311x_wdt_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) /* Stop the timer before we leave */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (!nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) sch311x_wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) /* Deregister */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) misc_deregister(&sch311x_wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) sch311x_wdt_data.runtime_reg = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) static void sch311x_wdt_shutdown(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) /* Turn the WDT off if we have a soft shutdown */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) sch311x_wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) static struct platform_driver sch311x_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) .probe = sch311x_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) .remove = sch311x_wdt_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) .shutdown = sch311x_wdt_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) .name = DRV_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) int err = 0, reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) unsigned short base_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) unsigned char dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) sch311x_sio_enter(sio_config_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) /* Check device ID. We currently know about:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) /* Select logical device A (runtime registers) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* Check if Logical Device Register is currently active */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) pr_info("Seems that LDN 0x0a is not active...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) /* Get the base address of the runtime registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) sch311x_sio_inb(sio_config_port, 0x61);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (!base_addr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) pr_err("Base address not set\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) *addr = base_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) sch311x_sio_exit(sio_config_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) static int __init sch311x_wdt_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) int err, i, found = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) unsigned short addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) for (i = 0; !found && sch311x_ioports[i]; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) found++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (!found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) sch311x_wdt_data.runtime_reg = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) err = platform_driver_register(&sch311x_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if (IS_ERR(sch311x_wdt_pdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) err = PTR_ERR(sch311x_wdt_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) goto unreg_platform_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) unreg_platform_driver:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) platform_driver_unregister(&sch311x_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) static void __exit sch311x_wdt_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) platform_device_unregister(sch311x_wdt_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) platform_driver_unregister(&sch311x_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) module_init(sch311x_wdt_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) module_exit(sch311x_wdt_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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