^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Driver for watchdog aspect of for Zodiac Inflight Innovations RAVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Supervisory Processor(SP) MCU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2017 Zodiac Inflight Innovation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mfd/rave-sp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/nvmem-consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/reboot.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 <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) RAVE_SP_RESET_BYTE = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) RAVE_SP_RESET_REASON_NORMAL = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) RAVE_SP_RESET_DELAY_MS = 500,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * struct rave_sp_wdt_variant - RAVE SP watchdog variant
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * @max_timeout: Largest possible watchdog timeout setting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * @min_timeout: Smallest possible watchdog timeout setting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * @configure: Function to send configuration command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * @restart: Function to send "restart" command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct rave_sp_wdt_variant {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) unsigned int max_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) unsigned int min_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int (*configure)(struct watchdog_device *, bool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int (*restart)(struct watchdog_device *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * struct rave_sp_wdt - RAVE SP watchdog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * @wdd: Underlying watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * @sp: Pointer to parent RAVE SP device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * @variant: Device specific variant information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * @reboot_notifier: Reboot notifier implementing machine reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct rave_sp_wdt {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct watchdog_device wdd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct rave_sp *sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) const struct rave_sp_wdt_variant *variant;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct notifier_block reboot_notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static struct rave_sp_wdt *to_rave_sp_wdt(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return container_of(wdd, struct rave_sp_wdt, wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static int rave_sp_wdt_exec(struct watchdog_device *wdd, void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) size_t data_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return rave_sp_exec(to_rave_sp_wdt(wdd)->sp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) data, data_size, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int rave_sp_wdt_legacy_configure(struct watchdog_device *wdd, bool on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) u8 cmd[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) [0] = RAVE_SP_CMD_SW_WDT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) [1] = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) [2] = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) [3] = on,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) [4] = on ? wdd->timeout : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static int rave_sp_wdt_rdu_configure(struct watchdog_device *wdd, bool on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) u8 cmd[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) [0] = RAVE_SP_CMD_SW_WDT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) [1] = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) [2] = on,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) [3] = (u8)wdd->timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) [4] = (u8)(wdd->timeout >> 8),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^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) * rave_sp_wdt_configure - Configure watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * @wdd: Device to configure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * @on: Desired state of the watchdog timer (ON/OFF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * This function configures two aspects of the watchdog timer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * - Wheither it is ON or OFF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * - Its timeout duration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * with first aspect specified via function argument and second via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * the value of 'wdd->timeout'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int rave_sp_wdt_configure(struct watchdog_device *wdd, bool on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return to_rave_sp_wdt(wdd)->variant->configure(wdd, on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int rave_sp_wdt_legacy_restart(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) u8 cmd[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) [0] = RAVE_SP_CMD_RESET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) [1] = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) [2] = RAVE_SP_RESET_BYTE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int rave_sp_wdt_rdu_restart(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) u8 cmd[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) [0] = RAVE_SP_CMD_RESET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) [1] = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) [2] = RAVE_SP_RESET_BYTE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) [3] = RAVE_SP_RESET_REASON_NORMAL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static int rave_sp_wdt_reboot_notifier(struct notifier_block *nb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) unsigned long action, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * Restart handler is called in atomic context which means we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * can't communicate to SP via UART. Luckily for use SP will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * wait 500ms before actually resetting us, so we ask it to do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * so here and let the rest of the system go on wrapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * things up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (action == SYS_DOWN || action == SYS_HALT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct rave_sp_wdt *sp_wd =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) container_of(nb, struct rave_sp_wdt, reboot_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) const int ret = sp_wd->variant->restart(&sp_wd->wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) dev_err(sp_wd->wdd.parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) "Failed to issue restart command (%d)", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static int rave_sp_wdt_restart(struct watchdog_device *wdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) unsigned long action, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * The actual work was done by reboot notifier above. SP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * firmware waits 500 ms before issuing reset, so let's hang
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * here for twice that delay and hopefuly we'd never reach
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * the return statement.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) mdelay(2 * RAVE_SP_RESET_DELAY_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static int rave_sp_wdt_start(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) ret = rave_sp_wdt_configure(wdd, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) set_bit(WDOG_HW_RUNNING, &wdd->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static int rave_sp_wdt_stop(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return rave_sp_wdt_configure(wdd, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static int rave_sp_wdt_set_timeout(struct watchdog_device *wdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) wdd->timeout = timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return rave_sp_wdt_configure(wdd, watchdog_active(wdd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static int rave_sp_wdt_ping(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) u8 cmd[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) [0] = RAVE_SP_CMD_PET_WDT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) [1] = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static const struct watchdog_info rave_sp_wdt_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) .identity = "RAVE SP Watchdog",
^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) static const struct watchdog_ops rave_sp_wdt_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) .start = rave_sp_wdt_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) .stop = rave_sp_wdt_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) .ping = rave_sp_wdt_ping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) .set_timeout = rave_sp_wdt_set_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) .restart = rave_sp_wdt_restart,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static const struct rave_sp_wdt_variant rave_sp_wdt_legacy = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) .max_timeout = 255,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) .min_timeout = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) .configure = rave_sp_wdt_legacy_configure,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) .restart = rave_sp_wdt_legacy_restart,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static const struct rave_sp_wdt_variant rave_sp_wdt_rdu = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) .max_timeout = 180,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) .min_timeout = 60,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) .configure = rave_sp_wdt_rdu_configure,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) .restart = rave_sp_wdt_rdu_restart,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static const struct of_device_id rave_sp_wdt_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) .compatible = "zii,rave-sp-watchdog-legacy",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) .data = &rave_sp_wdt_legacy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) .compatible = "zii,rave-sp-watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) .data = &rave_sp_wdt_rdu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) { /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static int rave_sp_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct watchdog_device *wdd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct rave_sp_wdt *sp_wd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) struct nvmem_cell *cell;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) __le16 timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) sp_wd = devm_kzalloc(dev, sizeof(*sp_wd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (!sp_wd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) sp_wd->variant = of_device_get_match_data(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) sp_wd->sp = dev_get_drvdata(dev->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) wdd = &sp_wd->wdd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) wdd->parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) wdd->info = &rave_sp_wdt_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) wdd->ops = &rave_sp_wdt_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) wdd->min_timeout = sp_wd->variant->min_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) wdd->max_timeout = sp_wd->variant->max_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) wdd->status = WATCHDOG_NOWAYOUT_INIT_STATUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) wdd->timeout = 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) cell = nvmem_cell_get(dev, "wdt-timeout");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (!IS_ERR(cell)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) void *value = nvmem_cell_read(cell, &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (!IS_ERR(value)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) memcpy(&timeout, value, min(len, sizeof(timeout)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) kfree(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) nvmem_cell_put(cell);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) watchdog_init_timeout(wdd, le16_to_cpu(timeout), dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) watchdog_set_restart_priority(wdd, 255);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) watchdog_stop_on_unregister(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) sp_wd->reboot_notifier.notifier_call = rave_sp_wdt_reboot_notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) ret = devm_register_reboot_notifier(dev, &sp_wd->reboot_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) dev_err(dev, "Failed to register reboot notifier\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * We don't know if watchdog is running now. To be sure, let's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * start it and depend on watchdog core to ping it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) wdd->max_hw_heartbeat_ms = wdd->max_timeout * 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) ret = rave_sp_wdt_start(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) dev_err(dev, "Watchdog didn't start\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) ret = devm_watchdog_register_device(dev, wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) rave_sp_wdt_stop(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static struct platform_driver rave_sp_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) .probe = rave_sp_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) .name = KBUILD_MODNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) .of_match_table = rave_sp_wdt_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) module_platform_driver(rave_sp_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) MODULE_DEVICE_TABLE(of, rave_sp_wdt_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) MODULE_DESCRIPTION("RAVE SP Watchdog driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) MODULE_ALIAS("platform:rave-sp-watchdog");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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