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 <[email protected]> --- 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 [email protected] http://lists.infradead.org/mailman/listinfo/barebox
