[PATCH v2 01/20] wdt: imx8qxp: add option to control external PMIC wdt via IMX8 SCU
Igor Opaniuk
igor.opaniuk at foundries.io
Mon Nov 18 11:39:36 CET 2024
Hello Heiko,
some nitpicks below:
On Mon, Nov 18, 2024 at 7:27 AM Heiko Schocher <hs at denx.de> wrote:
>
> Driver for a PMIC watchdog timer controlled via Siemens SCU firmware
> extensions. Only useful on some Siemens i.MX8-based platforms as
> special SCFW is needed which provides the needed SCU API.
>
> Signed-off-by: Andrej Valek <andrej.valek at siemens.com>
> Signed-off-by: Heiko Schocher <hs at denx.de>
> ---
>
> Changes in v2:
> - work on comments from Stefan:
> - rename driver file from scu_wdt.c to scu_pmic_wdt.c
> - rename Kconfig symbol from CONFIG_WDT_IMX_SCU to CONFIG_WDT_SCU_PMIC
> - reworked Kconfig help text
> - add comment that TIMER_FUNC_CTRL_PMIC_WDOG is a siemens specific
> SCU API extension in their SCFW.
> - reworked commit message
>
> drivers/misc/imx8/scu_api.c | 21 ++++++++++++
> drivers/watchdog/Kconfig | 7 ++++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/scu_pmic_wdt.c | 59 +++++++++++++++++++++++++++++++++
> include/firmware/imx/sci/rpc.h | 3 ++
> include/firmware/imx/sci/sci.h | 1 +
> 6 files changed, 92 insertions(+)
> create mode 100644 drivers/watchdog/scu_pmic_wdt.c
>
> diff --git a/drivers/misc/imx8/scu_api.c b/drivers/misc/imx8/scu_api.c
> index 591d71b096a..edb6923151a 100644
> --- a/drivers/misc/imx8/scu_api.c
> +++ b/drivers/misc/imx8/scu_api.c
> @@ -951,6 +951,27 @@ int sc_timer_set_wdog_window(sc_ipc_t ipc, sc_timer_wdog_time_t window)
> return ret;
> }
>
> +int sc_timer_control_pmic_wdog(sc_ipc_t ipc, u8 cmd)
> +{
> + struct udevice *dev = gd->arch.scu_dev;
> + struct sc_rpc_msg_s msg;
> + int size = sizeof(struct sc_rpc_msg_s);
> + int ret;
> +
> + RPC_VER(&msg) = SC_RPC_VERSION;
> + RPC_SVC(&msg) = (u8)SC_RPC_SVC_TIMER;
> + RPC_FUNC(&msg) = (u8)TIMER_FUNC_CTRL_PMIC_WDOG;
> + RPC_U8(&msg, 0U) = (u8)cmd;
> + RPC_SIZE(&msg) = 2U;
> +
> + ret = misc_call(dev, SC_FALSE, &msg, size, &msg, size);
> + if (ret)
> + printf("%s: res:%d\n",
> + __func__, RPC_R8(&msg));
> +
> + return ret;
> +}
> +
> int sc_seco_authenticate(sc_ipc_t ipc, sc_seco_auth_cmd_t cmd,
> sc_faddr_t addr)
> {
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 0e45f0a0922..f317d0922cb 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -428,6 +428,13 @@ config WDT_ARM_SMC
> Select this to enable Arm SMC watchdog timer. This watchdog will manage
> a watchdog based on ARM SMCCC communication.
>
> +config WDT_SCU_PMIC
> + bool "Enable PMIC Watchdog Timer support for siemens platforms"
s/siemens/Siemens/g
> + depends on IMX8 && WDT
depends on ARCH_IMX8 && WDT ?
IMX8 Kconfig symbol implies additional dependency on CAAM module,
which is not the case with this driver.
> + help
> + Select this to enable the PMIC watchdog driver controlled via
> + IMX8 SCU API found on Siemens platforms.
> +
> config SPL_WDT
> bool "Enable driver model for watchdog timer drivers in SPL"
> depends on SPL_DM
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 0b107c008f7..fed924f7e01 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -45,6 +45,7 @@ obj-$(CONFIG_WDT_OCTEONTX) += octeontx_wdt.o
> obj-$(CONFIG_WDT_OMAP3) += omap_wdt.o
> obj-$(CONFIG_WDT_SBSA) += sbsa_gwdt.o
> obj-$(CONFIG_WDT_K3_RTI) += rti_wdt.o
> +obj-$(CONFIG_WDT_SCU_PMIC) += scu_pmic_wdt.o
> obj-$(CONFIG_WDT_SL28CPLD) += sl28cpld-wdt.o
> obj-$(CONFIG_WDT_SP805) += sp805_wdt.o
> obj-$(CONFIG_WDT_STARFIVE) += starfive_wdt.o
> diff --git a/drivers/watchdog/scu_pmic_wdt.c b/drivers/watchdog/scu_pmic_wdt.c
> new file mode 100644
> index 00000000000..e7ca00de654
> --- /dev/null
> +++ b/drivers/watchdog/scu_pmic_wdt.c
> @@ -0,0 +1,59 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Driver for a PMIC watchdog timer controlled via Siemens SCU firmware
> + * extensions. Only useful on some Siemens i.MX8-based platforms as
> + * special NXP SCFW is needed which provides the needed SCU API.
> + *
> + * Copyright (C) 2024 Siemens AG
> + */
> +
> +#include <dm.h>
> +#include <wdt.h>
> +#include <firmware/imx/sci/sci.h>
> +
> +/* watchdog commands */
> +#define CMD_START_WDT 0x55
> +#define CMD_STOP_WDT 0x45
> +#define CMD_PING_WDT 0x35
> +
> +static int scu_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
> +{
> + /* start external watchdog via Timer API */
> + return sc_timer_control_pmic_wdog(-1, CMD_START_WDT);
> +}
> +
> +static int scu_wdt_stop(struct udevice *dev)
> +{
> + /* stop external watchdog via Timer API */
> + return sc_timer_control_pmic_wdog(-1, CMD_STOP_WDT);
> +}
> +
> +static int scu_wdt_reset(struct udevice *dev)
> +{
> + return sc_timer_control_pmic_wdog(-1, CMD_PING_WDT);
> +}
> +
> +static int scu_wdt_probe(struct udevice *dev)
> +{
> + debug("%s(dev=%p)\n", __func__, dev);
> + return 0;
> +}
> +
> +static const struct wdt_ops scu_wdt_ops = {
> + .reset = scu_wdt_reset,
> + .start = scu_wdt_start,
> + .stop = scu_wdt_stop,
> +};
> +
> +static const struct udevice_id scu_wdt_ids[] = {
> + { .compatible = "siemens,scu-wdt" },
> + { }
> +};
> +
> +U_BOOT_DRIVER(scu_wdt) = {
> + .name = "scu_wdt",
> + .id = UCLASS_WDT,
> + .of_match = scu_wdt_ids,
> + .probe = scu_wdt_probe,
> + .ops = &scu_wdt_ops,
> +};
> diff --git a/include/firmware/imx/sci/rpc.h b/include/firmware/imx/sci/rpc.h
> index 28adec2a8e1..6f16cf4a8b6 100644
> --- a/include/firmware/imx/sci/rpc.h
> +++ b/include/firmware/imx/sci/rpc.h
> @@ -231,4 +231,7 @@ struct sc_rpc_msg_s {
> #define TIMER_FUNC_SET_SYSCTR_PERIODIC_ALARM 17U /* Index for sc_timer_set_sysctr_periodic_alarm() RPC call */
> #define TIMER_FUNC_CANCEL_SYSCTR_ALARM 18U /* Index for sc_timer_cancel_sysctr_alarm() RPC call */
>
> +/* siemens specific API extension from Siemens */
please drop one "siemens"
> +#define TIMER_FUNC_CTRL_PMIC_WDOG 20U /*!< Index for sc_timer_ctrl_pmic_wdog() RPC call */
> +
> #endif /* SC_RPC_H */
> diff --git a/include/firmware/imx/sci/sci.h b/include/firmware/imx/sci/sci.h
> index 7d8499f070a..b971b62836d 100644
> --- a/include/firmware/imx/sci/sci.h
> +++ b/include/firmware/imx/sci/sci.h
> @@ -123,6 +123,7 @@ int sc_rm_set_master_sid(sc_ipc_t ipc, sc_rsrc_t resource, sc_rm_sid_t sid);
>
> /* Timer API */
> int sc_timer_set_wdog_window(sc_ipc_t ipc, sc_timer_wdog_time_t window);
> +int sc_timer_control_pmic_wdog(sc_ipc_t ipc, u8 cmd);
>
> /* SECO API */
> int sc_seco_authenticate(sc_ipc_t ipc, sc_seco_auth_cmd_t cmd,
> --
> 2.20.1
>
--
Best regards - Freundliche Grüsse - Meilleures salutations
Igor Opaniuk
Senior Software Engineer, Embedded & Security
E: igor.opaniuk at foundries.io
W: www.foundries.io
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