We already have mtd-ram support for accessing memory-mapped RAMs.
Add support for the mtd-rom binding, so read-only access while
using the driver can be enforced. This is e.g. useful for memory-mapped
flash that can be normally read, but needs special handling for write
and erasure.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
drivers/mtd/devices/mtdram.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c
index c9371b16d0f5..abef07d9c0a7 100644
--- a/drivers/mtd/devices/mtdram.c
+++ b/drivers/mtd/devices/mtdram.c
@@ -38,6 +38,7 @@ static int ram_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retle
static int mtdram_probe(struct device_d *dev)
{
+ long type;
struct resource *iores;
int device_id;
struct mtd_info *mtd;
@@ -53,9 +54,11 @@ static int mtdram_probe(struct device_d *dev)
mtd->name = xstrdup(alias);
}
+ type = (long)device_get_match_data(dev);
+
if (!mtd->name) {
device_id = DEVICE_ID_DYNAMIC;
- mtd->name = "mtdram";
+ mtd->name = type == MTD_RAM ? "mtdram" : "mtdrom";
}
iores = dev_request_mem_resource(dev, 0);
@@ -67,16 +70,19 @@ static int mtdram_probe(struct device_d *dev)
mtd->priv = IOMEM(iores->start);
size = (unsigned long) resource_size(iores);
- mtd->type = MTD_RAM;
+ mtd->type = type;
mtd->writesize = 1;
mtd->writebufsize = 64;
- mtd->flags = MTD_CAP_RAM;
mtd->size = size;
mtd->_read = ram_read;
- mtd->_write = ram_write;
- mtd->_erase = ram_erase;
- mtd->erasesize = 1;
+
+ if (type == MTD_RAM) {
+ mtd->flags = MTD_CAP_RAM;
+ mtd->_write = ram_write;
+ mtd->_erase = ram_erase;
+ mtd->erasesize = 1;
+ }
mtd->dev.parent = dev;
@@ -92,6 +98,10 @@ nobase:
static __maybe_unused struct of_device_id mtdram_dt_ids[] = {
{
.compatible = "mtd-ram",
+ .data = (void *)MTD_RAM
+ }, {
+ .compatible = "mtd-rom",
+ .data = (void *)MTD_ROM
}, {
/* sentinel */
}
--
2.30.2
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
