bcm47xx: add support for kernel 5.4

Ethernet, switch, LEDs, buttons, USB, sysupgrade & LuCI were
successfully tested on BCM4706.

WARNING: Hack for BCM4710 adding BCM4710_PROTECTED_FILL_TLB() to the
local_r4k_flush_cache_sigtramp() could not be ported. That function has
been dropped in:
commit adcc81f148d7 ("MIPS: math-emu: Write-protect delay slot emulation pages")
commit 3315b6b336c8 ("MIPS: Delete unused flush_cache_sigtramp()")
it's unsure if that chipset will still work reliably.

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

1 files changed, 73 insertions, 0 deletions

diff --git a/target/linux/bcm47xx/patches-5.4/800-bcma-add-table-of-serial-flashes-with-smaller-blocks.patch b/target/linux/bcm47xx/patches-5.4/800-bcma-add-table-of-serial-flashes-with-smaller-blocks.patch
new file mode 100644
index 0000000000..318dc55810
--- /dev/null
+++ b/target/linux/bcm47xx/patches-5.4/800-bcma-add-table-of-serial-flashes-with-smaller-blocks.patch
@@ -0,0 +1,73 @@
+From 597715c61ae75a05ab3310a34ff3857a006f0f63 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Thu, 20 Nov 2014 21:32:42 +0100
+Subject: [PATCH] bcma: add table of serial flashes with smaller blocks
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+ drivers/bcma/driver_chipcommon_sflash.c | 29 +++++++++++++++++++++++++++++
+ 1 file changed, 29 insertions(+)
+
+--- a/drivers/bcma/driver_chipcommon_sflash.c
++++ b/drivers/bcma/driver_chipcommon_sflash.c
+@@ -9,6 +9,7 @@
+ 
+ #include <linux/platform_device.h>
+ #include <linux/bcma/bcma.h>
++#include <bcm47xx_board.h>
+ 
+ static struct resource bcma_sflash_resource = {
+ 	.name	= "bcma_sflash",
+@@ -42,6 +43,13 @@ static const struct bcma_sflash_tbl_e bc
+ 	{ NULL },
+ };
+ 
++/* Some devices use smaller blocks (and have more of them) */
++static const struct bcma_sflash_tbl_e bcma_sflash_st_shrink_tbl[] = {
++	{ "M25P16", 0x14, 0x1000, 512, },
++	{ "M25P32", 0x15, 0x1000, 1024, },
++	{ NULL },
++};
++
+ static const struct bcma_sflash_tbl_e bcma_sflash_sst_tbl[] = {
+ 	{ "SST25WF512", 1, 0x1000, 16, },
+ 	{ "SST25VF512", 0x48, 0x1000, 16, },
+@@ -85,6 +93,24 @@ static void bcma_sflash_cmd(struct bcma_
+ 	bcma_err(cc->core->bus, "SFLASH control command failed (timeout)!\n");
+ }
+ 
++const struct bcma_sflash_tbl_e *bcma_sflash_shrink_flash(u32 id)
++{
++	enum bcm47xx_board board = bcm47xx_board_get();
++	const struct bcma_sflash_tbl_e *e;
++
++	switch (board) {
++	case BCM47XX_BOARD_NETGEAR_WGR614_V10:
++	case BCM47XX_BOARD_NETGEAR_WNR1000_V3:
++		for (e = bcma_sflash_st_shrink_tbl; e->name; e++) {
++			if (e->id == id)
++				return e;
++		}
++		return NULL;
++	default:
++		return NULL;
++	}
++}
++
+ /* Initialize serial flash access */
+ int bcma_sflash_init(struct bcma_drv_cc *cc)
+ {
+@@ -115,6 +141,10 @@ int bcma_sflash_init(struct bcma_drv_cc
+ 		case 0x13:
+ 			return -ENOTSUPP;
+ 		default:
++			e = bcma_sflash_shrink_flash(id);
++			if (e)
++				break;
++
+ 			for (e = bcma_sflash_st_tbl; e->name; e++) {
+ 				if (e->id == id)
+ 					break;