mediatek: add Linksys E8450 support

The Linksys E8450, also known as Belkin RT3200, is a dual-band
IEEE 802.11bgn/ac/ax router based on MediaTek MT7622BV and
MediaTek MT7915AN chips.

FCC: K7S-03571 and K7S-03572

Hardware highlights:
 - CPU: MediaTek MT7622BV (2x ARM Cortex-A53 @ 1350 MHz max.)
 - RAM: 512MB DDR3
 - Flash: 128MB SPI-NAND (2k+64)
 - Ethernet: MT7531BE switch with 5 1000Base-T ports
             CPU port connected with 2500Base-X
 - WiFi 2.4 GHz: 802.11bgn 4T4R built-in antennas
                 MT7622VB built-in
 - WiFi   5 GHz: 802.11ac/ax 4T4R built-in antennas
                 MT7915AN chip on-board via PCIe
                 MT7975AN front-end
 - Buttons: Reset and WPS
 - LEDS: 3 user controllable LEDs, 4 wired to switch
 - USB: USB2.0, single port
 - no Bluetooth (supported by SoC, not wired on board)
 - Serial: JST PH 2.0MM 6 Pin connector inside device
            ----_____________----
           [  GND RX - TX  -  -  ]
            ---------------------
 - JTAG:   unpopulated ARM JTAG 20-pin connector (works)

This commit adds support for the device in a way that is compatible
with the vendor firmware's bootloader and dual-boot flash layout, the
resulting image can directly be flashed using the vendor firmware.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 122 insertions, 0 deletions

diff --git a/target/linux/mediatek/patches-5.10/340-mtd-spinand-Add-support-for-the-Fidelix-FM35X1GA.patch b/target/linux/mediatek/patches-5.10/340-mtd-spinand-Add-support-for-the-Fidelix-FM35X1GA.patch
new file mode 100644
index 0000000000..69a9297e1f
--- /dev/null
+++ b/target/linux/mediatek/patches-5.10/340-mtd-spinand-Add-support-for-the-Fidelix-FM35X1GA.patch
@@ -0,0 +1,122 @@
+From ea0df4552efcdcc2806fe6eba0540b5f719d80b6 Mon Sep 17 00:00:00 2001
+From: Davide Fioravanti <pantanastyle@gmail.com>
+Date: Fri, 8 Jan 2021 15:35:24 +0100
+Subject: [PATCH 1/1] mtd: spinand: Add support for the Fidelix FM35X1GA
+
+Datasheet: http://www.hobos.com.cn/upload/datasheet/DS35X1GAXXX_100_rev00.pdf
+
+Signed-off-by: Davide Fioravanti <pantanastyle@gmail.com>
+---
+ drivers/mtd/nand/spi/Makefile  |  2 +-
+ drivers/mtd/nand/spi/core.c    |  1 +
+ drivers/mtd/nand/spi/fidelix.c | 80 ++++++++++++++++++++++++++++++++++
+ include/linux/mtd/spinand.h    |  1 +
+ 4 files changed, 83 insertions(+), 1 deletion(-)
+ create mode 100644 drivers/mtd/nand/spi/fidelix.c
+
+--- a/drivers/mtd/nand/spi/Makefile
++++ b/drivers/mtd/nand/spi/Makefile
+@@ -1,3 +1,3 @@
+ # SPDX-License-Identifier: GPL-2.0
+-spinand-objs := core.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o
++spinand-objs := core.o fidelix.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o
+ obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
+--- a/drivers/mtd/nand/spi/core.c
++++ b/drivers/mtd/nand/spi/core.c
+@@ -755,6 +755,7 @@ static const struct nand_ops spinand_ops
+ };
+ 
+ static const struct spinand_manufacturer *spinand_manufacturers[] = {
++	&fidelix_spinand_manufacturer,
+ 	&gigadevice_spinand_manufacturer,
+ 	&macronix_spinand_manufacturer,
+ 	&micron_spinand_manufacturer,
+--- /dev/null
++++ b/drivers/mtd/nand/spi/fidelix.c
+@@ -0,0 +1,76 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * Copyright (c) 2020 Davide Fioravanti <pantanastyle@gmail.com>
++ */
++
++#include <linux/device.h>
++#include <linux/kernel.h>
++#include <linux/mtd/spinand.h>
++
++#define SPINAND_MFR_FIDELIX		0xE5
++#define FIDELIX_ECCSR_MASK		0x0F
++
++static SPINAND_OP_VARIANTS(read_cache_variants,
++		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
++		SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
++		SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
++
++static SPINAND_OP_VARIANTS(write_cache_variants,
++		SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
++		SPINAND_PROG_LOAD(true, 0, NULL, 0));
++
++static SPINAND_OP_VARIANTS(update_cache_variants,
++		SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
++		SPINAND_PROG_LOAD(false, 0, NULL, 0));
++
++static int fm35x1ga_ooblayout_ecc(struct mtd_info *mtd, int section,
++				  struct mtd_oob_region *region)
++{
++	if (section > 3)
++		return -ERANGE;
++
++	region->offset = (16 * section) + 8;
++	region->length = 8;
++
++	return 0;
++}
++
++static int fm35x1ga_ooblayout_free(struct mtd_info *mtd, int section,
++				   struct mtd_oob_region *region)
++{
++	if (section > 3)
++		return -ERANGE;
++
++	region->offset = (16 * section) + 2;
++	region->length = 6;
++
++	return 0;
++}
++
++static const struct mtd_ooblayout_ops fm35x1ga_ooblayout = {
++	.ecc = fm35x1ga_ooblayout_ecc,
++	.free = fm35x1ga_ooblayout_free,
++};
++
++static const struct spinand_info fidelix_spinand_table[] = {
++	SPINAND_INFO("FM35X1GA",
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x71),
++		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
++		     NAND_ECCREQ(4, 512),
++		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
++					      &write_cache_variants,
++					      &update_cache_variants),
++		     SPINAND_HAS_QE_BIT,
++		     SPINAND_ECCINFO(&fm35x1ga_ooblayout, NULL)),
++};
++
++static const struct spinand_manufacturer_ops fidelix_spinand_manuf_ops = {
++};
++
++const struct spinand_manufacturer fidelix_spinand_manufacturer = {
++	.id = SPINAND_MFR_FIDELIX,
++	.name = "Fidelix",
++	.chips = fidelix_spinand_table,
++	.nchips = ARRAY_SIZE(fidelix_spinand_table),
++	.ops = &fidelix_spinand_manuf_ops,
++};
+--- a/include/linux/mtd/spinand.h
++++ b/include/linux/mtd/spinand.h
+@@ -238,6 +238,7 @@ struct spinand_manufacturer {
+ };
+ 
+ /* SPI NAND manufacturers */
++extern const struct spinand_manufacturer fidelix_spinand_manufacturer;
+ extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
+ extern const struct spinand_manufacturer macronix_spinand_manufacturer;
+ extern const struct spinand_manufacturer micron_spinand_manufacturer;