c18f07f02f
- patch dtb to add reserved-memory stanza for the phram device to use (aarch64 does not accept memmap= command line option) - patch phram driver to use memremap() instead of ioremap() as ioremap can't be used for system ram on arm devices
47 lines
1.5 KiB
Diff
47 lines
1.5 KiB
Diff
From bb7e7aeb3d832059e33b1e76eb85d4680f77abf2 Mon Sep 17 00:00:00 2001
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From: Ben Hutchings <ben@decadent.org.uk>
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Date: Fri, 3 Jun 2016 01:08:36 +0100
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Subject: [PATCH] phram: Use memremap() to allow mapping of system RAM
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Using memremap() instead of ioremap() allows mapping a disk image in
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system RAM that has somehow been reserved. It should fall back
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to ioremap() where necessary.
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Entirely untested, and I'm not convinced this is a good idea at all.
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---
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drivers/mtd/devices/phram.c | 7 ++++---
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1 file changed, 4 insertions(+), 3 deletions(-)
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diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c
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index 8b66e52ca3cc..0ea254e2ba51 100644
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--- a/drivers/mtd/devices/phram.c
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+++ b/drivers/mtd/devices/phram.c
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@@ -88,7 +88,7 @@ static void unregister_devices(void)
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list_for_each_entry_safe(this, safe, &phram_list, list) {
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mtd_device_unregister(&this->mtd);
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- iounmap(this->mtd.priv);
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+ memunmap(this->mtd.priv);
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kfree(this->mtd.name);
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kfree(this);
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}
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@@ -104,7 +104,8 @@ static int register_device(char *name, phys_addr_t start, size_t len)
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goto out0;
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ret = -EIO;
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- new->mtd.priv = ioremap(start, len);
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+ new->mtd.priv = memremap(start, len,
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+ MEMREMAP_WB | MEMREMAP_WT | MEMREMAP_WC);
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if (!new->mtd.priv) {
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pr_err("ioremap failed\n");
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goto out1;
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@@ -134,7 +135,7 @@ static int register_device(char *name, phys_addr_t start, size_t len)
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return 0;
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out2:
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- iounmap(new->mtd.priv);
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+ memunmap(new->mtd.priv);
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out1:
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kfree(new);
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out0:
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