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[68.147.8.254]) by smtp.gmail.com with ESMTPSA id c1sm6553245pfc.94.2020.04.24.13.25.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Apr 2020 13:25:13 -0700 (PDT) From: Mathieu Poirier To: bjorn.andersson@linaro.org, ohad@wizery.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com Cc: loic.pallardy@st.com, arnaud.pouliquen@st.com, linux-remoteproc@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 06/12] remoteproc: stm32: Get coprocessor state Date: Fri, 24 Apr 2020 14:24:59 -0600 Message-Id: <20200424202505.29562-7-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200424202505.29562-1-mathieu.poirier@linaro.org> References: <20200424202505.29562-1-mathieu.poirier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce the required mechanic to get the state of the M4 when the remoteproc core is initialising. Mainly based on the work published by Arnaud Pouliquen [1]. [1]. https://patchwork.kernel.org/project/linux-remoteproc/list/?series=239877 Signed-off-by: Mathieu Poirier Reviewed-by: Loic Pallardy --- drivers/remoteproc/stm32_rproc.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c index a285f338bed8..89fbd2ffac93 100644 --- a/drivers/remoteproc/stm32_rproc.c +++ b/drivers/remoteproc/stm32_rproc.c @@ -38,6 +38,15 @@ #define STM32_MBX_VQ1_ID 1 #define STM32_MBX_SHUTDOWN "shutdown" +#define RSC_TBL_SIZE (1024) + +#define M4_STATE_OFF 0 +#define M4_STATE_INI 1 +#define M4_STATE_CRUN 2 +#define M4_STATE_CSTOP 3 +#define M4_STATE_STANDBY 4 +#define M4_STATE_CRASH 5 + struct stm32_syscon { struct regmap *map; u32 reg; @@ -635,12 +644,23 @@ static int stm32_rproc_parse_dt(struct platform_device *pdev, return 0; } +static int stm32_rproc_get_m4_status(struct stm32_rproc *ddata, + unsigned int *state) +{ + /* See stm32_rproc_parse_dt() */ + if (!ddata->m4_state.map) + return -EINVAL; + + return regmap_read(ddata->m4_state.map, ddata->m4_state.reg, state); +} + static int stm32_rproc_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct stm32_rproc *ddata; struct device_node *np = dev->of_node; struct rproc *rproc; + unsigned int state; bool auto_boot = false; int ret; @@ -664,6 +684,15 @@ static int stm32_rproc_probe(struct platform_device *pdev) if (ret) goto free_rproc; + ret = stm32_rproc_get_m4_status(ddata, &state); + if (ret) { + /* + * We couldn't get the coprocessor's state, assume + * it is not running. + */ + state = M4_STATE_OFF; + } + rproc->auto_boot = auto_boot; rproc->has_iommu = false; ddata->workqueue = create_workqueue(dev_name(dev)); -- 2.20.1