^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /***************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com> *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) ***************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "sch56xx-common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Insmod parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) module_param(nowayout, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define SIO_SCH56XX_LD_EM 0x0C /* Embedded uController Logical Dev */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define SIO_UNLOCK_KEY 0x55 /* Key to enable Super-I/O */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define SIO_REG_LDSEL 0x07 /* Logical device select */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define SIO_REG_DEVID 0x20 /* Device ID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define SIO_REG_ENABLE 0x30 /* Logical device enable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define SIO_REG_ADDR 0x66 /* Logical device address (2 bytes) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define SIO_SCH5627_ID 0xC6 /* Chipset ID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define SIO_SCH5636_ID 0xC7 /* Chipset ID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define REGION_LENGTH 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define SCH56XX_CMD_READ 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define SCH56XX_CMD_WRITE 0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* Watchdog registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define SCH56XX_REG_WDOG_PRESET 0x58B
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define SCH56XX_REG_WDOG_CONTROL 0x58C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define SCH56XX_WDOG_TIME_BASE_SEC 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define SCH56XX_REG_WDOG_OUTPUT_ENABLE 0x58E
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define SCH56XX_WDOG_OUTPUT_ENABLE 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct sch56xx_watchdog_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) u16 addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct mutex *io_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct watchdog_info wdinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct watchdog_device wddev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) u8 watchdog_preset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u8 watchdog_control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) u8 watchdog_output_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static struct platform_device *sch56xx_pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /* Super I/O functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static inline int superio_inb(int base, int reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) outb(reg, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return inb(base + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static inline int superio_enter(int base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /* Don't step on other drivers' I/O space by accident */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!request_muxed_region(base, 2, "sch56xx")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) pr_err("I/O address 0x%04x already in use\n", base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) outb(SIO_UNLOCK_KEY, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static inline void superio_select(int base, int ld)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) outb(SIO_REG_LDSEL, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) outb(ld, base + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static inline void superio_exit(int base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) outb(SIO_LOCK_KEY, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) release_region(base, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static int sch56xx_send_cmd(u16 addr, u8 cmd, u16 reg, u8 v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) u8 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * According to SMSC for the commands we use the maximum time for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * the EM to respond is 15 ms, but testing shows in practice it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * responds within 15-32 reads, so we first busy poll, and if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * that fails sleep a bit and try again until we are way past
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * the 15 ms maximum response time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) const int max_busy_polls = 64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) const int max_lazy_polls = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* (Optional) Write-Clear the EC to Host Mailbox Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) val = inb(addr + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) outb(val, addr + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* Set Mailbox Address Pointer to first location in Region 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) outb(0x00, addr + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) outb(0x80, addr + 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /* Write Request Packet Header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) outb(cmd, addr + 4); /* VREG Access Type read:0x02 write:0x03 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) outb(0x01, addr + 5); /* # of Entries: 1 Byte (8-bit) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) outb(0x04, addr + 2); /* Mailbox AP to first data entry loc. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* Write Value field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (cmd == SCH56XX_CMD_WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) outb(v, addr + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /* Write Address field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) outb(reg & 0xff, addr + 6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) outb(reg >> 8, addr + 7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /* Execute the Random Access Command */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) outb(0x01, addr); /* Write 01h to the Host-to-EC register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /* EM Interface Polling "Algorithm" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) for (i = 0; i < max_busy_polls + max_lazy_polls; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (i >= max_busy_polls)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) msleep(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* Read Interrupt source Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) val = inb(addr + 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /* Write Clear the interrupt source bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) outb(val, addr + 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) /* Command Completed ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (val & 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (i == max_busy_polls + max_lazy_polls) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) pr_err("Max retries exceeded reading virtual register 0x%04hx (%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) reg, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * According to SMSC we may need to retry this, but sofar I've always
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * seen this succeed in 1 try.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) for (i = 0; i < max_busy_polls; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /* Read EC-to-Host Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) val = inb(addr + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /* Command Completed ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (val == 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (i == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) pr_warn("EC reports: 0x%02x reading virtual register 0x%04hx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) (unsigned int)val, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (i == max_busy_polls) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) pr_err("Max retries exceeded reading virtual register 0x%04hx (%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) reg, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * According to the SMSC app note we should now do:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * Set Mailbox Address Pointer to first location in Region 1 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * outb(0x00, addr + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * outb(0x80, addr + 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * But if we do that things don't work, so let's not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /* Read Value field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (cmd == SCH56XX_CMD_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return inb(addr + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) int sch56xx_read_virtual_reg(u16 addr, u16 reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return sch56xx_send_cmd(addr, SCH56XX_CMD_READ, reg, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) EXPORT_SYMBOL(sch56xx_read_virtual_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int sch56xx_write_virtual_reg(u16 addr, u16 reg, u8 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return sch56xx_send_cmd(addr, SCH56XX_CMD_WRITE, reg, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) EXPORT_SYMBOL(sch56xx_write_virtual_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) int sch56xx_read_virtual_reg16(u16 addr, u16 reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) int lsb, msb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /* Read LSB first, this will cause the matching MSB to be latched */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) lsb = sch56xx_read_virtual_reg(addr, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (lsb < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return lsb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) msb = sch56xx_read_virtual_reg(addr, reg + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (msb < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return msb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return lsb | (msb << 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) EXPORT_SYMBOL(sch56xx_read_virtual_reg16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int sch56xx_read_virtual_reg12(u16 addr, u16 msb_reg, u16 lsn_reg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int high_nibble)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) int msb, lsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /* Read MSB first, this will cause the matching LSN to be latched */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) msb = sch56xx_read_virtual_reg(addr, msb_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (msb < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return msb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) lsn = sch56xx_read_virtual_reg(addr, lsn_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (lsn < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return lsn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (high_nibble)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) return (msb << 4) | (lsn >> 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return (msb << 4) | (lsn & 0x0f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) EXPORT_SYMBOL(sch56xx_read_virtual_reg12);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * Watchdog routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static int watchdog_set_timeout(struct watchdog_device *wddev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) unsigned int resolution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) u8 control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /* 1 second or 60 second resolution? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (timeout <= 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) resolution = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) resolution = 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (timeout < resolution || timeout > (resolution * 255))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (resolution == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) control = data->watchdog_control | SCH56XX_WDOG_TIME_BASE_SEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) control = data->watchdog_control & ~SCH56XX_WDOG_TIME_BASE_SEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (data->watchdog_control != control) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) mutex_lock(data->io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) ret = sch56xx_write_virtual_reg(data->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) SCH56XX_REG_WDOG_CONTROL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) control);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) mutex_unlock(data->io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) data->watchdog_control = control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * Remember new timeout value, but do not write as that (re)starts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * the watchdog countdown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) wddev->timeout = data->watchdog_preset * resolution;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) static int watchdog_start(struct watchdog_device *wddev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) u8 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * The sch56xx's watchdog cannot really be started / stopped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * it is always running, but we can avoid the timer expiring
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * from causing a system reset by clearing the output enable bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) * The sch56xx's watchdog will set the watchdog event bit, bit 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * of the second interrupt source register (at base-address + 9),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * when the timer expires.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * This will only cause a system reset if the 0-1 flank happens when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * output enable is true. Setting output enable after the flank will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * not cause a reset, nor will the timer expiring a second time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * This means we must clear the watchdog event bit in case it is set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * The timer may still be running (after a recent watchdog_stop) and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * mere milliseconds away from expiring, so the timer must be reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * first!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) mutex_lock(data->io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /* 1. Reset the watchdog countdown counter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) data->watchdog_preset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) goto leave;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /* 2. Enable output */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) val = data->watchdog_output_enable | SCH56XX_WDOG_OUTPUT_ENABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) ret = sch56xx_write_virtual_reg(data->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) SCH56XX_REG_WDOG_OUTPUT_ENABLE, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) goto leave;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) data->watchdog_output_enable = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /* 3. Clear the watchdog event bit if set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) val = inb(data->addr + 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (val & 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) outb(0x01, data->addr + 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) leave:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) mutex_unlock(data->io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) static int watchdog_trigger(struct watchdog_device *wddev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) /* Reset the watchdog countdown counter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) mutex_lock(data->io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) data->watchdog_preset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) mutex_unlock(data->io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return ret;
^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 watchdog_stop(struct watchdog_device *wddev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) u8 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) val = data->watchdog_output_enable & ~SCH56XX_WDOG_OUTPUT_ENABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) mutex_lock(data->io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) ret = sch56xx_write_virtual_reg(data->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) SCH56XX_REG_WDOG_OUTPUT_ENABLE, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) mutex_unlock(data->io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) data->watchdog_output_enable = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) static const struct watchdog_ops watchdog_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) .start = watchdog_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) .stop = watchdog_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) .ping = watchdog_trigger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) .set_timeout = watchdog_set_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) u16 addr, u32 revision, struct mutex *io_lock, int check_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) struct sch56xx_watchdog_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) int err, control, output_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /* Cache the watchdog registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) mutex_lock(io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) control =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) sch56xx_read_virtual_reg(addr, SCH56XX_REG_WDOG_CONTROL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) output_enable =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) sch56xx_read_virtual_reg(addr, SCH56XX_REG_WDOG_OUTPUT_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) mutex_unlock(io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) if (control < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (output_enable < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (check_enabled && !(output_enable & SCH56XX_WDOG_OUTPUT_ENABLE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) pr_warn("Watchdog not enabled by BIOS, not registering\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) data = kzalloc(sizeof(struct sch56xx_watchdog_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) data->addr = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) data->io_lock = io_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) strlcpy(data->wdinfo.identity, "sch56xx watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) sizeof(data->wdinfo.identity));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) data->wdinfo.firmware_version = revision;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) data->wdinfo.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (!nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) data->wdinfo.options |= WDIOF_MAGICCLOSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) data->wddev.info = &data->wdinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) data->wddev.ops = &watchdog_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) data->wddev.parent = parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) data->wddev.timeout = 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) data->wddev.min_timeout = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) data->wddev.max_timeout = 255 * 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) set_bit(WDOG_NO_WAY_OUT, &data->wddev.status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (output_enable & SCH56XX_WDOG_OUTPUT_ENABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) set_bit(WDOG_HW_RUNNING, &data->wddev.status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) /* Since the watchdog uses a downcounter there is no register to read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) the BIOS set timeout from (if any was set at all) ->
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) Choose a preset which will give us a 1 minute timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (control & SCH56XX_WDOG_TIME_BASE_SEC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) data->watchdog_preset = 60; /* seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) data->watchdog_preset = 1; /* minute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) data->watchdog_control = control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) data->watchdog_output_enable = output_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) watchdog_set_drvdata(&data->wddev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) err = watchdog_register_device(&data->wddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) pr_err("Registering watchdog chardev: %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) kfree(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return NULL;
^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) return data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) EXPORT_SYMBOL(sch56xx_watchdog_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) watchdog_unregister_device(&data->wddev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) kfree(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) EXPORT_SYMBOL(sch56xx_watchdog_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) * platform dev find, add and remove functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) static int __init sch56xx_find(int sioaddr, const char **name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) u8 devid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) unsigned short address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) err = superio_enter(sioaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) devid = superio_inb(sioaddr, SIO_REG_DEVID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) switch (devid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) case SIO_SCH5627_ID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) *name = "sch5627";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) case SIO_SCH5636_ID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) *name = "sch5636";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) pr_debug("Unsupported device id: 0x%02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) (unsigned int)devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) superio_select(sioaddr, SIO_SCH56XX_LD_EM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) if (!(superio_inb(sioaddr, SIO_REG_ENABLE) & 0x01)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) pr_warn("Device not activated\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * Warning the order of the low / high byte is the other way around
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * as on most other superio devices!!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) address = superio_inb(sioaddr, SIO_REG_ADDR) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) superio_inb(sioaddr, SIO_REG_ADDR + 1) << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (address == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) pr_warn("Base address not set\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) err = address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) superio_exit(sioaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) static int __init sch56xx_device_add(int address, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) struct resource res = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) .start = address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) .end = address + REGION_LENGTH - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) .flags = IORESOURCE_IO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) sch56xx_pdev = platform_device_alloc(name, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (!sch56xx_pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) res.name = sch56xx_pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) err = acpi_check_resource_conflict(&res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) goto exit_device_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) err = platform_device_add_resources(sch56xx_pdev, &res, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) pr_err("Device resource addition failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) goto exit_device_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) err = platform_device_add(sch56xx_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) pr_err("Device addition failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) goto exit_device_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) exit_device_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) platform_device_put(sch56xx_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) static int __init sch56xx_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) int address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) const char *name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) address = sch56xx_find(0x4e, &name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) if (address < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) address = sch56xx_find(0x2e, &name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) if (address < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) return address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) return sch56xx_device_add(address, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) static void __exit sch56xx_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) platform_device_unregister(sch56xx_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) MODULE_DESCRIPTION("SMSC SCH56xx Hardware Monitoring Common Code");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) module_init(sch56xx_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) module_exit(sch56xx_exit);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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