linux-kernel - [PATCH v2 07/16] remoteproc: st: add reserved memory support

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Date:   Thu, 30 Nov 2017 17:46:42 +0100
From:   Loic Pallardy <loic.pallardy@...com>
To:     <bjorn.andersson@...aro.org>, <ohad@...ery.com>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <arnaud.pouliquen@...com>, <benjamin.gaignard@...aro.org>,
        Loic Pallardy <loic.pallardy@...com>
Subject: [PATCH v2 07/16] remoteproc: st: add reserved memory support

ST remote processor needs some specified memory regions for firmware and IPC.
Memory regions are defined as reserved memory and should be registered in
remoteproc core thanks to rproc_add_carveout function.
Memory region release is handled by ST driver itself on remove operation.

Signed-off-by: Loic Pallardy <loic.pallardy@...com>
---
 drivers/remoteproc/st_remoteproc.c | 43 +++++++++++++++++++++++++++++++-------
 1 file changed, 35 insertions(+), 8 deletions(-)

diff --git a/drivers/remoteproc/st_remoteproc.c b/drivers/remoteproc/st_remoteproc.c
index aacef0e..1549ce8 100644
--- a/drivers/remoteproc/st_remoteproc.c
+++ b/drivers/remoteproc/st_remoteproc.c
@@ -19,6 +19,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
@@ -208,8 +209,10 @@ static int st_rproc_parse_dt(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct rproc *rproc = platform_get_drvdata(pdev);
 	struct st_rproc *ddata = rproc->priv;
-	struct device_node *np = dev->of_node;
-	int err;
+	struct device_node *node, *np = dev->of_node;
+	struct resource res;
+	struct rproc_mem_entry *mem;
+	int err, count, i;
 
 	if (ddata->config->sw_reset) {
 		ddata->sw_reset = devm_reset_control_get_exclusive(dev,
@@ -254,10 +257,36 @@ static int st_rproc_parse_dt(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	err = of_reserved_mem_device_init(dev);
-	if (err) {
-		dev_err(dev, "Failed to obtain shared memory\n");
-		return err;
+	count = of_count_phandle_with_args(np, "memory-region", NULL);
+
+	for (i = 0; i < count; i++) {
+		node = of_parse_phandle(np, "memory-region", i);
+		if (!node) {
+			dev_err(dev, "No memory-region specified\n");
+			return -EINVAL;
+		}
+
+		err = of_address_to_resource(node, 0, &res);
+		if (err) {
+			dev_err(dev, "Bad memory-region definition\n");
+			return err;
+		}
+
+		mem = devm_kzalloc(dev, sizeof(*mem), GFP_KERNEL);
+		if (!mem)
+			return -ENOMEM;
+
+		mem->dma = res.start;
+		mem->da = res.start;
+		mem->len = resource_size(&res);
+		mem->va = devm_ioremap_wc(dev, mem->dma, mem->len);
+		if (!mem->va) {
+			dev_err(dev, "Unable to map memory region: %pa+%zx\n",
+				&res.start, mem->len);
+			return -EBUSY;
+		}
+
+		rproc_add_carveout(rproc, mem);
 	}
 
 	err = clk_prepare(ddata->clk);
@@ -387,8 +416,6 @@ static int st_rproc_remove(struct platform_device *pdev)
 
 	clk_disable_unprepare(ddata->clk);
 
-	of_reserved_mem_device_release(&pdev->dev);
-
 	for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
 		mbox_free_channel(ddata->mbox_chan[i]);
 
-- 
1.9.1