linux-kernel - [PATCH v2 05/12] remoteproc: stm32: Parse syscon that will manage M4 synchronisation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200424202505.29562-6-mathieu.poirier@linaro.org>
Date:   Fri, 24 Apr 2020 14:24:58 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     bjorn.andersson@...aro.org, ohad@...ery.com,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com
Cc:     loic.pallardy@...com, arnaud.pouliquen@...com,
        linux-remoteproc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 05/12] remoteproc: stm32: Parse syscon that will manage M4 synchronisation

Get from the DT the syncon to probe the state of the remote processor
and the location of the resource table.

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 <mathieu.poirier@...aro.org>
Reviewed-by: Loic Pallardy <loic.pallardy@...com>
---
 drivers/remoteproc/stm32_rproc.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index 658439d4b00a..a285f338bed8 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -70,6 +70,8 @@ struct stm32_rproc {
 	struct reset_control *rst;
 	struct stm32_syscon hold_boot;
 	struct stm32_syscon pdds;
+	struct stm32_syscon m4_state;
+	struct stm32_syscon rsctbl;
 	int wdg_irq;
 	u32 nb_rmems;
 	struct stm32_rproc_mem *rmems;
@@ -606,6 +608,30 @@ static int stm32_rproc_parse_dt(struct platform_device *pdev,
 
 	*auto_boot = of_property_read_bool(np, "st,auto-boot");
 
+	/*
+	 * See if we can check the M4 status, i.e if it was started
+	 * from the boot loader or not.
+	 */
+	err = stm32_rproc_get_syscon(np, "st,syscfg-m4-state",
+				     &ddata->m4_state);
+	if (err) {
+		/* remember this */
+		ddata->m4_state.map = NULL;
+		/* no coprocessor state syscon (optional) */
+		dev_warn(dev, "m4 state not supported\n");
+
+		/* no need to go further */
+		return 0;
+	}
+
+	/* See if we can get the resource table */
+	err = stm32_rproc_get_syscon(np, "st,syscfg-rsc-tbl",
+				     &ddata->rsctbl);
+	if (err) {
+		/* no rsc table syscon (optional) */
+		dev_warn(dev, "rsc tbl syscon not supported\n");
+	}
+
 	return 0;
 }
 
-- 
2.20.1