[PATCH v8] wdt: nuvoton: Add support for Nuvoton
Stefan Roese
sr at denx.de
Fri Apr 1 14:18:05 CEST 2022
On 4/1/22 11:59, Jim Liu wrote:
> Add watchdog controller driver for NPCM7xx/npcm8xx
>
> the wdt design of npcm750 and npcm845 is the same.
> so the driver can work on npcm750 and npcm845.
> about npcm845 wdt dtsi i will followed kernel dts name
> to use nuvoton,npcm750-wdt.
>
> Signed-off-by: Jim Liu <JJLIU0 at nuvoton.com>
> Reviewed-by: Stefan Roese <sr at denx.de>
> Reviewed-by: Simon Glass <sjg at chromium.org>
>
> Changes for v2:
> - coding style cleanup
> - change register type from struct
> Changes for v3:
> - remove common.h
> Changes for v4:
> - add a bit of detail about the device in Kconfig
> - lower-case hex change
> - remove the reset function delay.
> Actually when setting writel(NPCM_WTR )the watchdog is resetting
> the BMC
> changes for v5:
> - modify compatible name to support all NPCM SOC
>
> changes for v6:
> - followed linux kernel to modify compatible name
>
> change for v7:
> - add second compatible name to driver
>
> change for v8
> - remove second compatible name
> ---
Just a quick note: Thanks for the patch revision history. This makes
reviewing easier in general. But: The history should be placed below
the "---" line instead. Otherwise the patch revision history will also
be added to the git commit message, which should not be the case.
No need to resend. Just make sure to change the order in your next
submissions.
Thanks,
Stefan
> drivers/watchdog/Kconfig | 8 +++
> drivers/watchdog/Makefile | 1 +
> drivers/watchdog/npcm_wdt.c | 116 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 125 insertions(+)
> create mode 100644 drivers/watchdog/npcm_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index f90f0ca02b..d33882fb6a 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -196,6 +196,14 @@ config WDT_MTK
> The watchdog timer is stopped when initialized.
> It performs full SoC reset.
>
> +config WDT_NPCM
> + bool "Nuvoton watchdog timer support"
> + depends on WDT && ARCH_NPCM
> + help
> + This enables Nuvoton npcm7xx/npcm8xx watchdog timer driver,
> + The watchdog timer is stopped when initialized.
> + It performs full SoC reset.
> +
> config WDT_OCTEONTX
> bool "OcteonTX core watchdog support"
> depends on WDT && (ARCH_OCTEONTX || ARCH_OCTEONTX2)
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index a35bd559f5..1089cd21f5 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_WDT_MPC8xx) += mpc8xx_wdt.o
> obj-$(CONFIG_WDT_MT7620) += mt7620_wdt.o
> obj-$(CONFIG_WDT_MT7621) += mt7621_wdt.o
> obj-$(CONFIG_WDT_MTK) += mtk_wdt.o
> +obj-$(CONFIG_WDT_NPCM) += npcm_wdt.o
> obj-$(CONFIG_WDT_OCTEONTX) += octeontx_wdt.o
> obj-$(CONFIG_WDT_OMAP3) += omap_wdt.o
> obj-$(CONFIG_WDT_SBSA) += sbsa_gwdt.o
> diff --git a/drivers/watchdog/npcm_wdt.c b/drivers/watchdog/npcm_wdt.c
> new file mode 100644
> index 0000000000..256020f5d3
> --- /dev/null
> +++ b/drivers/watchdog/npcm_wdt.c
> @@ -0,0 +1,116 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2022 Nuvoton Technology, Inc
> + */
> +
> +#include <dm.h>
> +#include <errno.h>
> +#include <log.h>
> +#include <wdt.h>
> +#include <asm/io.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +
> +#define NPCM_WTCLK (BIT(10) | BIT(11)) /* Clock divider */
> +#define NPCM_WTE BIT(7) /* Enable */
> +#define NPCM_WTIE BIT(6) /* Enable irq */
> +#define NPCM_WTIS (BIT(4) | BIT(5)) /* Interval selection */
> +#define NPCM_WTIF BIT(3) /* Interrupt flag*/
> +#define NPCM_WTRF BIT(2) /* Reset flag */
> +#define NPCM_WTRE BIT(1) /* Reset enable */
> +#define NPCM_WTR BIT(0) /* Reset counter */
> +
> +struct npcm_wdt_priv {
> + void __iomem *regs;
> +};
> +
> +static int npcm_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
> +{
> + struct npcm_wdt_priv *priv = dev_get_priv(dev);
> + u32 time_out, val;
> +
> + time_out = (u32)(timeout_ms) / 1000;
> + if (time_out < 2)
> + val = 0x800;
> + else if (time_out < 3)
> + val = 0x420;
> + else if (time_out < 6)
> + val = 0x810;
> + else if (time_out < 11)
> + val = 0x430;
> + else if (time_out < 22)
> + val = 0x820;
> + else if (time_out < 44)
> + val = 0xc00;
> + else if (time_out < 87)
> + val = 0x830;
> + else if (time_out < 173)
> + val = 0xc10;
> + else if (time_out < 688)
> + val = 0xc20;
> + else
> + val = 0xc30;
> +
> + val |= NPCM_WTRE | NPCM_WTE | NPCM_WTR | NPCM_WTIE;
> + writel(val, priv->regs);
> +
> + return 0;
> +}
> +
> +static int npcm_wdt_stop(struct udevice *dev)
> +{
> + struct npcm_wdt_priv *priv = dev_get_priv(dev);
> +
> + writel(0, priv->regs);
> +
> + return 0;
> +}
> +
> +static int npcm_wdt_reset(struct udevice *dev)
> +{
> + struct npcm_wdt_priv *priv = dev_get_priv(dev);
> +
> + writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, priv->regs);
> +
> + return 0;
> +}
> +
> +static int npcm_wdt_of_to_plat(struct udevice *dev)
> +{
> + struct npcm_wdt_priv *priv = dev_get_priv(dev);
> +
> + priv->regs = dev_read_addr_ptr(dev);
> + if (!priv->regs)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static const struct wdt_ops npcm_wdt_ops = {
> + .start = npcm_wdt_start,
> + .reset = npcm_wdt_reset,
> + .stop = npcm_wdt_stop,
> +};
> +
> +static const struct udevice_id npcm_wdt_ids[] = {
> + { .compatible = "nuvoton,npcm750-wdt" },
> + { }
> +};
> +
> +static int npcm_wdt_probe(struct udevice *dev)
> +{
> + debug("%s() wdt%u\n", __func__, dev_seq(dev));
> + npcm_wdt_stop(dev);
> +
> + return 0;
> +}
> +
> +U_BOOT_DRIVER(npcm_wdt) = {
> + .name = "npcm_wdt",
> + .id = UCLASS_WDT,
> + .of_match = npcm_wdt_ids,
> + .probe = npcm_wdt_probe,
> + .priv_auto = sizeof(struct npcm_wdt_priv),
> + .of_to_plat = npcm_wdt_of_to_plat,
> + .ops = &npcm_wdt_ops,
> +};
Viele Grüße,
Stefan Roese
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-51 Fax: (+49)-8142-66989-80 Email: sr at denx.de
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