linux-kernel - [PATCH v2 10/12] remoteproc: stm32: Introduce new parse fw ops for synchronisation

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Date:   Fri, 24 Apr 2020 14:25:03 -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 10/12] remoteproc: stm32: Introduce new parse fw ops for synchronisation

Introduce new parse firmware rproc_ops functions to be used when
synchonising with an MCU.

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 | 51 +++++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index 86d23c35d805..b8ae8aed5585 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -215,7 +215,34 @@ static int stm32_rproc_elf_load_rsc_table(struct rproc *rproc,
 	return 0;
 }
 
-static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
+static int stm32_rproc_sync_elf_load_rsc_table(struct rproc *rproc,
+					       const struct firmware *fw)
+{
+	struct resource_table *table = NULL;
+	struct stm32_rproc *ddata = rproc->priv;
+
+	if (ddata->rsc_va) {
+		table = (struct resource_table *)ddata->rsc_va;
+		/* Assuming that the resource table fits in 1kB is fair */
+		rproc->cached_table = kmemdup(table, RSC_TBL_SIZE, GFP_KERNEL);
+		if (!rproc->cached_table)
+			return -ENOMEM;
+
+		rproc->table_ptr = rproc->cached_table;
+		rproc->table_sz = RSC_TBL_SIZE;
+		return 0;
+	}
+
+	rproc->cached_table = NULL;
+	rproc->table_ptr = NULL;
+	rproc->table_sz = 0;
+
+	dev_warn(&rproc->dev, "no resource table found for this firmware\n");
+	return 0;
+}
+
+static int stm32_rproc_parse_memory_regions(struct rproc *rproc,
+					    const struct firmware *fw)
 {
 	struct device *dev = rproc->dev.parent;
 	struct device_node *np = dev->of_node;
@@ -268,9 +295,30 @@ static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
 		index++;
 	}
 
+	return 0;
+}
+
+static int stm32_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
+{
+	int ret = stm32_rproc_parse_memory_regions(rproc, fw);
+
+	if (ret)
+		return ret;
+
 	return stm32_rproc_elf_load_rsc_table(rproc, fw);
 }
 
+static int stm32_rproc_sync_parse_fw(struct rproc *rproc,
+				     const struct firmware *fw)
+{
+	int ret = stm32_rproc_parse_memory_regions(rproc, fw);
+
+	if (ret)
+		return ret;
+
+	return stm32_rproc_sync_elf_load_rsc_table(rproc, fw);
+}
+
 static irqreturn_t stm32_rproc_wdg(int irq, void *data)
 {
 	struct platform_device *pdev = data;
@@ -544,6 +592,7 @@ static struct rproc_ops st_rproc_ops = {
 static __maybe_unused struct rproc_ops st_rproc_sync_ops = {
 	.start		= stm32_rproc_sync_start,
 	.stop		= stm32_rproc_stop,
+	.parse_fw       = stm32_rproc_sync_parse_fw,
 };
 
 static const struct of_device_id stm32_rproc_match[] = {
-- 
2.20.1