Re: [PATCH 3/4] watchdog: cortina_wdt: add support for HW WDT on CAxxxx SoCs

Am 20.01.20 um 10:53 schrieb Alex Nemirovsky:

From: Jason Li jason.li@cortina-access.com

Add support for hardware watchdog timer on all Cortina Access CAxxxx family of SoCs.

Signed-off-by: Jason Li jason.li@cortina-access.com Signed-off-by: Alex Nemirovsky alex.nemirovsky@cortina-access.com

---

MAINTAINERS | 2 + drivers/watchdog/Kconfig | 8 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/cortina_wdt.c | 144 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 155 insertions(+) create mode 100644 drivers/watchdog/cortina_wdt.c

diff --git a/MAINTAINERS b/MAINTAINERS index b7b3359..f9334f9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -180,6 +180,7 @@ F: board/cortina/common/* F: board/cortina/common/Kconfig F: board/cortina/common/armv8/lowlevel_init.S F: drivers/gpio/cortina_gpio.c +F: drivers/watchdog/cortina_wdt.c

ARM/CZ.NIC TURRIS MOX SUPPORT M: Marek Behun marek.behun@nic.cz @@ -662,6 +663,7 @@ F: board/cortina/common/* F: board/cortina/common/Kconfig F: board/cortina/common/mips/* F: drivers/gpio/cortina_gpio.c +F: drivers/watchdog/cortina_wdt.c

MIPS MSCC M: Gregory CLEMENT gregory.clement@bootlin.com diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 8c16d69..2f7dedb 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -99,6 +99,14 @@ config WDT_CDNS Select this to enable Cadence watchdog timer, which can be found on some Xilinx Microzed Platform.

+config WDT_CORTINA

• bool "Cortina Access CAxxxx watchdog timer support"
• depends on WDT
• help

•  Cortina Access CAxxxx watchdog timer support.
  

•  This driver support all CPU ISAs supported by Cortina
  

•      Access CAxxxx SoCs.
  

config WDT_MPC8xx bool "MPC8xx watchdog timer support" depends on WDT && MPC8xx diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 955caef..87f92a4 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o obj-$(CONFIG_WDT_ARMADA_37XX) += armada-37xx-wdt.o obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o +obj-$(CONFIG_WDT_CORTINA) += cortina_wdt.o obj-$(CONFIG_WDT_ORION) += orion_wdt.o obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o obj-$(CONFIG_WDT_MPC8xx) += mpc8xx_wdt.o diff --git a/drivers/watchdog/cortina_wdt.c b/drivers/watchdog/cortina_wdt.c new file mode 100644 index 0000000..61df802 --- /dev/null +++ b/drivers/watchdog/cortina_wdt.c @@ -0,0 +1,144 @@ +// SPDX-License-Identifier: GPL-2.0+

+/*

• • Copyright (C) 2020 Cortina-Access
• • Author: Jason Li jason.li@cortina-access.com
• */

same comment as in patch 2/4

+#include <common.h> +#include <dm.h> +#include <asm/io.h> +#include <wdt.h>

+#define CA_WDT_CTRL 0x00 +#define CA_WDT_PS 0x04 +#define CA_WDT_DIV 0x08 +#define CA_WDT_LD 0x0C +#define CA_WDT_LOADE 0x10 +#define CA_WDT_CNT 0x14 +#define CA_WDT_IE 0x18 +#define CA_WDT_INT 0x1C +#define CA_WDT_STAT 0x20

+/* CA_WDT_CTRL */ +#define CTL_WDT_EN BIT(0) +#define CTL_WDT_RSTEN BIT(1) +#define CTL_WDT_CLK_SEL BIT(2) +/* CA_WDT_LOADE */ +#define WDT_UPD BIT(0) +#define WDT_UPD_PS BIT(1)

+/* Global config */ +#define WDT_RESET_SUB BIT(4) +#define WDT_RESET_ALL_BLOCK BIT(6) +#define WDT_RESET_REMAP BIT(7) +#define WDT_EXT_RESET BIT(8) +#define WDT_RESET_DEFAULT (WDT_EXT_RESET | WDT_RESET_REMAP |

• 		 WDT_RESET_ALL_BLOCK | WDT_RESET_SUB)
  

+struct ca_wdt_priv {

• void __iomem *base;
• void __iomem *global_config;

+};

+static void cortina_wdt_set_timeout(struct udevice *dev, u64 timeout_ms) +{

• struct ca_wdt_priv *priv = dev_get_priv(dev);
• /* Prescale using millisecond unit */
• writel(CORTINA_PER_IO_FREQ / 1000, priv->base + CA_WDT_PS);
• /* Millisecond */
• writel(1, priv->base + CA_WDT_DIV);
• writel(timeout_ms, priv->base + CA_WDT_LD);
• writel(WDT_UPD | WDT_UPD_PS, priv->base + CA_WDT_LOADE);

+}

+static int cortina_wdt_start(struct udevice *dev, u64 timeout, ulong flags) +{

• struct ca_wdt_priv *priv = dev_get_priv(dev);
• unsigned int reg_v;
• cortina_wdt_set_timeout(dev, timeout);
• /* WDT Reset option */
• reg_v = readl(priv->global_config);
• reg_v |= WDT_RESET_DEFAULT;
• writel(reg_v, priv->global_config);
• /* Enable WDT */
• reg_v = readl(priv->base);
• reg_v |= (CTL_WDT_EN | CTL_WDT_RSTEN | CTL_WDT_CLK_SEL);
• writel(reg_v, priv->base);

setbits_32() ?

• return 0;

+}

+static int cortina_wdt_stop(struct udevice *dev) +{

• struct ca_wdt_priv *priv = dev_get_priv(dev);
• /* Disable WDT */
• writel(0, priv->base);
• return 0;

+}

+static int cortina_wdt_reset(struct udevice *dev) +{

• struct ca_wdt_priv *priv = dev_get_priv(dev);
• /* Reload WDT counter */
• writel(WDT_UPD, priv->base + CA_WDT_LOADE);
• return 0;

+}

+static int cortina_wdt_expire_now(struct udevice *dev, ulong flags) +{

• /* Set 1ms timeout to reset system */
• cortina_wdt_set_timeout(dev, 1);
• hang();
• return 0;

+}

+static int cortina_wdt_probe(struct udevice *dev) +{

• struct ca_wdt_priv *priv = dev_get_priv(dev);
• priv->base = dev_remap_addr_index(dev, 0);
• if (!priv->base)

• return -ENOENT;
  

• priv->global_config = dev_remap_addr_index(dev, 1);
• if (!priv->global_config)

• return -ENOENT;
  

• /* Stop WDT */
• cortina_wdt_stop(dev);
• return 0;

+}

+static const struct wdt_ops cortina_wdt_ops = {

• .start = cortina_wdt_start,
• .reset = cortina_wdt_reset,
• .stop = cortina_wdt_stop,
• .expire_now = cortina_wdt_expire_now,

+};

+static const struct udevice_id cortina_wdt_ids[] = {

• {.compatible = "cortina,cortina-wdt"},
• {}

+};

+U_BOOT_DRIVER(cortina_wdt) = {

• .name = "cortina_wdt",
• .id = UCLASS_WDT,
• .probe = cortina_wdt_probe,
• .of_match = cortina_wdt_ids,
• .ops = &cortina_wdt_ops,

+};