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[92.29.24.243]) by smtp.gmail.com with ESMTPSA id je14-20020a05600c1f8e00b0040596352951sm19518451wmb.5.2023.11.20.13.21.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Nov 2023 13:21:29 -0800 (PST) From: Peter Griffin To: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, mturquette@baylibre.com, conor+dt@kernel.org, sboyd@kernel.org, tomasz.figa@gmail.com, s.nawrocki@samsung.com, linus.walleij@linaro.org, wim@linux-watchdog.org, linux@roeck-us.net, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, olof@lixom.net, gregkh@linuxfoundation.org, jirislaby@kernel.org, cw00.choi@samsung.com, alim.akhtar@samsung.com Cc: peter.griffin@linaro.org, tudor.ambarus@linaro.org, andre.draszik@linaro.org, semen.protsenko@linaro.org, saravanak@google.com, willmcvicker@google.com, soc@kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, linux-watchdog@vger.kernel.org, kernel-team@android.com, linux-serial@vger.kernel.org Subject: [PATCH v4 15/19] watchdog: s3c2410_wdt: Add support for WTCON register DBGACK_MASK bit Date: Mon, 20 Nov 2023 21:20:33 +0000 Message-ID: <20231120212037.911774-16-peter.griffin@linaro.org> X-Mailer: git-send-email 2.43.0.rc1.413.gea7ed67945-goog In-Reply-To: <20231120212037.911774-1-peter.griffin@linaro.org> References: <20231120212037.911774-1-peter.griffin@linaro.org> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The WDT uses the CPU core signal DBGACK to determine whether the SoC is running in debug mode or not. If the DBGACK signal is asserted and DBGACK_MASK is enabled, then WDT output and interrupt is masked. Presence of the DBGACK_MASK bit is determined by adding a new QUIRK_HAS_DBGACK_BIT quirk. Currently only gs101 SoC is known to have the DBGACK_MASK bit so add the quirk to drv_data_gs101_cl1 and drv_data_gs101_cl1 quirks. Signed-off-by: Peter Griffin --- drivers/watchdog/s3c2410_wdt.c | 32 +++++++++++++++++++++++++++----- 1 file changed, 27 insertions(+), 5 deletions(-) diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c index 08b8c57dd812..ed561deeeed9 100644 --- a/drivers/watchdog/s3c2410_wdt.c +++ b/drivers/watchdog/s3c2410_wdt.c @@ -34,9 +34,10 @@ #define S3C2410_WTCNT_MAXCNT 0xffff -#define S3C2410_WTCON_RSTEN (1 << 0) -#define S3C2410_WTCON_INTEN (1 << 2) -#define S3C2410_WTCON_ENABLE (1 << 5) +#define S3C2410_WTCON_RSTEN (1 << 0) +#define S3C2410_WTCON_INTEN (1 << 2) +#define S3C2410_WTCON_ENABLE (1 << 5) +#define S3C2410_WTCON_DBGACK_MASK (1 << 16) #define S3C2410_WTCON_DIV16 (0 << 3) #define S3C2410_WTCON_DIV32 (1 << 3) @@ -107,12 +108,16 @@ * %QUIRK_HAS_PMU_CNT_EN: PMU block has some register (e.g. CLUSTERx_NONCPU_OUT) * with "watchdog counter enable" bit. That bit should be set to make watchdog * counter running. + * + * %QUIRK_HAS_DBGACK_BIT: WTCON register has DBGACK_MASK bit. Enables masking + * WDT interrupt and reset request according to CPU core DBGACK signal. */ #define QUIRK_HAS_WTCLRINT_REG (1 << 0) #define QUIRK_HAS_PMU_MASK_RESET (1 << 1) #define QUIRK_HAS_PMU_RST_STAT (1 << 2) #define QUIRK_HAS_PMU_AUTO_DISABLE (1 << 3) #define QUIRK_HAS_PMU_CNT_EN (1 << 4) +#define QUIRK_HAS_DBGACK_BIT (1 << 5) /* These quirks require that we have a PMU register map */ #define QUIRKS_HAVE_PMUREG \ @@ -279,7 +284,7 @@ static const struct s3c2410_wdt_variant drv_data_gs101_cl0 = { .cnt_en_reg = GS_CLUSTER0_NONCPU_OUT, .cnt_en_bit = 8, .quirks = QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_MASK_RESET | QUIRK_HAS_PMU_CNT_EN | - QUIRK_HAS_WTCLRINT_REG, + QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_DBGACK_BIT, }; static const struct s3c2410_wdt_variant drv_data_gs101_cl1 = { @@ -291,7 +296,7 @@ static const struct s3c2410_wdt_variant drv_data_gs101_cl1 = { .cnt_en_reg = GS_CLUSTER1_NONCPU_OUT, .cnt_en_bit = 7, .quirks = QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_MASK_RESET | QUIRK_HAS_PMU_CNT_EN | - QUIRK_HAS_WTCLRINT_REG, + QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_DBGACK_BIT, }; static const struct of_device_id s3c2410_wdt_match[] = { @@ -408,6 +413,21 @@ static int s3c2410wdt_enable(struct s3c2410_wdt *wdt, bool en) return 0; } +static void s3c2410wdt_mask_dbgack(struct s3c2410_wdt *wdt, bool mask) +{ + unsigned long wtcon; + + if (!(wdt->drv_data->quirks & QUIRK_HAS_DBGACK_BIT)) + return; + + wtcon = readl(wdt->reg_base + S3C2410_WTCON); + if (mask) + wtcon |= S3C2410_WTCON_DBGACK_MASK; + else + wtcon &= ~S3C2410_WTCON_DBGACK_MASK; + writel(wtcon, wdt->reg_base + S3C2410_WTCON); +} + static int s3c2410wdt_keepalive(struct watchdog_device *wdd) { struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd); @@ -737,6 +757,8 @@ static int s3c2410wdt_probe(struct platform_device *pdev) wdt->wdt_device.bootstatus = s3c2410wdt_get_bootstatus(wdt); wdt->wdt_device.parent = dev; + s3c2410wdt_mask_dbgack(wdt, true); + /* * If "tmr_atboot" param is non-zero, start the watchdog right now. Also * set WDOG_HW_RUNNING bit, so that watchdog core can kick the watchdog.