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Ayush1325fabiobaltieri
Ayush1325
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fabiobaltieri
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drivers: watchdog: Add ti rti driver
- This driver is used in k3 generation CPUs from TI. - Does not support callbacks right now. Signed-off-by: Ayush Singh <[email protected]>
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‎drivers/watchdog/CMakeLists.txt‎

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@@ -64,4 +64,6 @@ zephyr_library_sources_ifdef(CONFIG_WDT_SHELL wdt_shell.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_RENESAS_RA wdt_renesas_ra.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_NXP_EWM wdt_nxp_ewm.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_TI_RTI wdt_ti_rti.c)
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zephyr_library_sources_ifdef(CONFIG_USERSPACE wdt_handlers.c)

‎drivers/watchdog/Kconfig‎

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@@ -159,4 +159,6 @@ source "drivers/watchdog/Kconfig.nxp_ewm"
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source "drivers/watchdog/Kconfig.xilinx_wwdt"
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source "drivers/watchdog/Kconfig.ti_rti"
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endif # WATCHDOG

‎drivers/watchdog/Kconfig.ti_rti‎

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# Copyright (c) 2025, Ayush Singh BeagleBoard.org Foundation
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# SPDX-License-Identifier: Apache-2.0
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config WDT_TI_RTI
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bool "Watchdog Driver for TI K3"
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default y
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depends on DT_HAS_TI_J7_RTI_WDT_ENABLED
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select HAS_WDT_DISABLE_AT_BOOT
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help
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Enable support for K3 Watchdog timer (RTI module) available in the K3 generation of processors.

‎drivers/watchdog/wdt_ti_rti.c‎

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/*
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* Copyright (c) 2025 Ayush Singh, BeagleBoard.org Foundation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT ti_j7_rti_wdt
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#include <zephyr/drivers/watchdog.h>
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#include <zephyr/kernel.h>
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#include <stdint.h>
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#define WDENABLE_KEY 0xa98559da
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#define WDDISABLE_KEY 0x5312aced
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#define WDKEY_SEQ0 0xe51a
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#define WDKEY_SEQ1 0xa35c
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#define WDT_PRELOAD_SHIFT 13
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#define WDT_PRELOAD_MAX 0xfff
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#define RTIWWDRX_NMI 0xa
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#define RTIWWDRX_RESET 0x5
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#define RTIGCTRL_HALT_BY_DBG 0
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#define RTIGCTRL_RUN_BY_DBG BIT(15)
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#define RTIWWDSIZE_100P 0x5
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#define RTIWWDSIZE_50P 0x50
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#define RTIWWDSIZE_25P 0x500
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#define RTIWWDSIZE_12P5 0x5000
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#define RTIWWDSIZE_6P25 0x50000
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#define RTIWWDSIZE_3P125 0x500000
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#define DEV_CFG(dev) ((const struct wdt_ti_rti_config *)(dev)->config)
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#define DEV_DATA(dev) ((struct wdt_ti_rti_data *)(dev)->data)
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#define DEV_REGS(dev) ((struct wdt_ti_rti_regs *)DEVICE_MMIO_GET(dev))
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struct wdt_ti_rti_regs {
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/* RTI Global Control Register, offset: 0x00 */
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volatile uint32_t GCTRL;
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uint32_t pad[35];
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/* Digital Watchdog Control Register, offset: 0x90 */
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volatile uint32_t DWDCTRL;
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/* Digital Watchdog Preload Register, offset: 0x94 */
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volatile uint32_t DWDPRLD;
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/* Watchdog Status Register, offset: 0x98 */
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volatile uint32_t WDSTATUS;
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/* Watchdog Key Register, offset: 0x9C */
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volatile uint32_t WDKEY;
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/* Digital Watchdog Down Counter, offset: 0xA0 */
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volatile uint32_t DWDCNTR;
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/* Digital Windowed Watchdog Reaction Control, offset: 0xA4 */
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volatile uint32_t WWDRXNCTRL;
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/* Digital Windowed Watchdog Window Size Control, offset: 0xA8 */
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volatile uint32_t WWDSIZECTRL;
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};
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struct wdt_ti_rti_data {
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DEVICE_MMIO_RAM;
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};
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struct wdt_ti_rti_config {
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DEVICE_MMIO_ROM;
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uint64_t freq;
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};
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static int wdt_ti_rti_setup(const struct device *dev, uint8_t options)
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{
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ARG_UNUSED(options);
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struct wdt_ti_rti_regs *regs = DEV_REGS(dev);
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if (options & WDT_OPT_PAUSE_HALTED_BY_DBG) {
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regs->GCTRL = RTIGCTRL_HALT_BY_DBG;
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} else {
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regs->GCTRL = RTIGCTRL_RUN_BY_DBG;
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}
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regs->DWDCTRL = WDENABLE_KEY;
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return 0;
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}
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static int wdt_ti_rti_disable(const struct device *dev)
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{
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struct wdt_ti_rti_regs *regs = DEV_REGS(dev);
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regs->DWDCTRL = WDDISABLE_KEY;
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regs->WDKEY = 0;
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return 0;
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}
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static int wdt_ti_rti_window_size(const struct wdt_window window)
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{
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const int window_sizes[] = {RTIWWDSIZE_100P, RTIWWDSIZE_50P, RTIWWDSIZE_25P,
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RTIWWDSIZE_12P5, RTIWWDSIZE_6P25, RTIWWDSIZE_3P125};
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if (window.max < window.min || window.max == 0) {
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return -EINVAL;
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}
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for (uint32_t idx = 0; idx < ARRAY_SIZE(window_sizes); idx++) {
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uint32_t temp = (window.max - window.min) << idx;
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if (temp == window.max) {
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return window_sizes[idx];
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} else if (temp > window.max) {
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break;
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}
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}
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return -EINVAL;
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}
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static int wdt_ti_rti_timeout(const struct device *dev, const struct wdt_timeout_cfg *cfg)
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{
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const struct wdt_ti_rti_config *config = DEV_CFG(dev);
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struct wdt_ti_rti_regs *regs = DEV_REGS(dev);
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uint32_t timer_margin;
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int window_size;
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window_size = wdt_ti_rti_window_size(cfg->window);
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if (window_size < 0) {
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return window_size;
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}
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timer_margin = (cfg->window.max * config->freq) / MSEC_PER_SEC;
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timer_margin >>= WDT_PRELOAD_SHIFT;
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if (timer_margin > WDT_PRELOAD_MAX) {
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return -EINVAL;
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}
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if (cfg->flags == WDT_FLAG_RESET_SOC) {
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regs->WWDRXNCTRL = RTIWWDRX_NMI;
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}
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regs->DWDPRLD = timer_margin;
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regs->WWDSIZECTRL = (uint32_t)window_size;
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return 0;
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}
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static int wdt_ti_rti_feed(const struct device *dev, int channel_id)
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{
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struct wdt_ti_rti_regs *regs = DEV_REGS(dev);
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if (channel_id != 0) {
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return -EINVAL;
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}
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regs->WDKEY = WDKEY_SEQ0;
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regs->WDKEY = WDKEY_SEQ1;
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return 0;
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}
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static int wdt_ti_rti_init(const struct device *dev)
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{
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struct wdt_ti_rti_regs *regs;
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DEVICE_MMIO_MAP(dev, K_MEM_CACHE_NONE);
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regs = DEV_REGS(dev);
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if (!regs) {
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return -EINVAL;
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}
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return 0;
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}
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static DEVICE_API(wdt, wdt_ti_rti_api) = {
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.setup = wdt_ti_rti_setup,
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.disable = wdt_ti_rti_disable,
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.feed = wdt_ti_rti_feed,
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.install_timeout = wdt_ti_rti_timeout,
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};
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#define WDT_TI_RTI_INIT(i) \
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static struct wdt_ti_rti_data wdt_ti_rti_data_##i = {}; \
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\
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static struct wdt_ti_rti_config wdt_ti_rti_config_##i = { \
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DEVICE_MMIO_ROM_INIT(DT_DRV_INST(i)), \
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.freq = DT_INST_PROP(i, clock_frequency), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(i, wdt_ti_rti_init, NULL, &wdt_ti_rti_data_##i, \
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&wdt_ti_rti_config_##i, POST_KERNEL, \
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CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, &wdt_ti_rti_api);
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DT_INST_FOREACH_STATUS_OKAY(WDT_TI_RTI_INIT)

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