kernel: backport Broadcom NVRAM driver cleanups

Refactoring of bcm47xx_nvram driver. It's used by bcm47xx and bcm53xx.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 80 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/831-v5.13-0001-firmware-bcm47xx_nvram-rename-finding-function-and-i.patch b/target/linux/generic/backport-5.4/831-v5.13-0001-firmware-bcm47xx_nvram-rename-finding-function-and-i.patch
new file mode 100644
index 0000000000..19938704b7
--- /dev/null
+++ b/target/linux/generic/backport-5.4/831-v5.13-0001-firmware-bcm47xx_nvram-rename-finding-function-and-i.patch
@@ -0,0 +1,80 @@
+From fb009cbdd0693bd633f11e99526617b3d392cfad Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 8 Mar 2021 10:03:16 +0100
+Subject: [PATCH] firmware: bcm47xx_nvram: rename finding function and its
+ variables
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+1. Use "bcm47xx_" function name prefix for consistency
+2. It takes flash start as argument so s/iobase/flash_start/
+3. "off" was used for finding flash end so just call it "flash_size"
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
+---
+ drivers/firmware/broadcom/bcm47xx_nvram.c | 24 ++++++++++++-----------
+ 1 file changed, 13 insertions(+), 11 deletions(-)
+
+--- a/drivers/firmware/broadcom/bcm47xx_nvram.c
++++ b/drivers/firmware/broadcom/bcm47xx_nvram.c
+@@ -48,11 +48,13 @@ static u32 find_nvram_size(void __iomem
+ 	return 0;
+ }
+ 
+-/* Probe for NVRAM header */
+-static int nvram_find_and_copy(void __iomem *iobase, u32 lim)
++/**
++ * bcm47xx_nvram_find_and_copy - find NVRAM on flash mapping & copy it
++ */
++static int bcm47xx_nvram_find_and_copy(void __iomem *flash_start, size_t res_size)
+ {
+ 	struct nvram_header __iomem *header;
+-	u32 off;
++	size_t flash_size;
+ 	u32 size;
+ 
+ 	if (nvram_len) {
+@@ -61,25 +63,25 @@ static int nvram_find_and_copy(void __io
+ 	}
+ 
+ 	/* TODO: when nvram is on nand flash check for bad blocks first. */
+-	off = FLASH_MIN;
+-	while (off <= lim) {
++	flash_size = FLASH_MIN;
++	while (flash_size <= res_size) {
+ 		/* Windowed flash access */
+-		size = find_nvram_size(iobase + off);
++		size = find_nvram_size(flash_start + flash_size);
+ 		if (size) {
+-			header = (struct nvram_header *)(iobase + off - size);
++			header = (struct nvram_header *)(flash_start + flash_size - size);
+ 			goto found;
+ 		}
+-		off <<= 1;
++		flash_size <<= 1;
+ 	}
+ 
+ 	/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
+-	header = (struct nvram_header *)(iobase + 4096);
++	header = (struct nvram_header *)(flash_start + 4096);
+ 	if (header->magic == NVRAM_MAGIC) {
+ 		size = NVRAM_SPACE;
+ 		goto found;
+ 	}
+ 
+-	header = (struct nvram_header *)(iobase + 1024);
++	header = (struct nvram_header *)(flash_start + 1024);
+ 	if (header->magic == NVRAM_MAGIC) {
+ 		size = NVRAM_SPACE;
+ 		goto found;
+@@ -124,7 +126,7 @@ int bcm47xx_nvram_init_from_mem(u32 base
+ 	if (!iobase)
+ 		return -ENOMEM;
+ 
+-	err = nvram_find_and_copy(iobase, lim);
++	err = bcm47xx_nvram_find_and_copy(iobase, lim);
+ 
+ 	iounmap(iobase);
+