[PATCH 7/7] remoteproc: st: add reserved memory support

[Loic Pallardy]

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.palla...@st.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