airoha: Add new target platform

Airoha is a new ARM platform based on Cortex-A53 which has recently been
merged into linux-next.

Due to BootROM limitations on this platform, the Cortex-A53 can't run in
Aarch64 mode and code must be compiled for 32-Bit ARM.

This support is based mostly on those linux-next commits backported
for kernel 5.15.

Patches:
1 - platform support = linux-next
2 - clock driver = linux-next
3 - gpio driver = linux-next
4 - linux,usable-memory-range dts support = linux-next
5 - mtd spinand driver
6 - spi driver
7 - pci driver (kconfig only, uses mediatek PCI) = linux-next

Still missing:
- Ethernet driver
- Sysupgrade support

A.t.m there exists one subtarget EN7523 with only one evaluation
board.

The initramfs can be run with the following commands from u-boot:
-
u-boot> setenv bootfile \
	openwrt-airoha-airoha_en7523-evb-initramfs-kernel.bin
u-boot> tftpboot
u-boot> bootm 0x81800000
-

Signed-off-by: Daniel Danzberger <daniel@dd-wrt.com>

1 files changed, 137 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.15/487-mtd-spinand-Add-support-for-Etron-EM73D044VCx.patch b/target/linux/generic/pending-5.15/487-mtd-spinand-Add-support-for-Etron-EM73D044VCx.patch
new file mode 100644
index 0000000000..a48e02fc08
--- /dev/null
+++ b/target/linux/generic/pending-5.15/487-mtd-spinand-Add-support-for-Etron-EM73D044VCx.patch
@@ -0,0 +1,137 @@
+diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile
+index 9c64d9fc..5f99ea72 100644
+--- 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 esmt.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
++spinand-objs := core.o esmt.o etron.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
+ obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
+diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
+index 9839ee44..9ab44217 100644
+--- a/drivers/mtd/nand/spi/core.c
++++ b/drivers/mtd/nand/spi/core.c
+@@ -898,6 +898,7 @@ static const struct nand_ops spinand_ops = {
+ static const struct spinand_manufacturer *spinand_manufacturers[] = {
+	&esmt_c8_spinand_manufacturer,
+	&gigadevice_spinand_manufacturer,
++	&etron_spinand_manufacturer,
+	&macronix_spinand_manufacturer,
+	&micron_spinand_manufacturer,
+	&paragon_spinand_manufacturer,
+diff --git a/drivers/mtd/nand/spi/etron.c b/drivers/mtd/nand/spi/etron.c
+new file mode 100644
+index 00000000..653092be
+--- /dev/null
++++ b/drivers/mtd/nand/spi/etron.c
+@@ -0,0 +1,98 @@
++// SPDX-License-Identifier: GPL-2.0
++
++#include <linux/device.h>
++#include <linux/kernel.h>
++#include <linux/mtd/spinand.h>
++
++#define SPINAND_MFR_ETRON			0xd5
++
++
++static SPINAND_OP_VARIANTS(read_cache_variants,
++		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, NULL, 0),
++		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
++		SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
++		SPINAND_PAGE_READ_FROM_CACHE_X2_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 etron_ooblayout_ecc(struct mtd_info *mtd, int section,
++					struct mtd_oob_region *oobregion)
++{
++	if (section)
++		return -ERANGE;
++
++	oobregion->offset = 72;
++	oobregion->length = 56;
++
++	return 0;
++}
++
++static int etron_ooblayout_free(struct mtd_info *mtd, int section,
++			   struct mtd_oob_region *oobregion)
++{
++	if (section)
++		return -ERANGE;
++
++	oobregion->offset = 1;
++	oobregion->length = 71;
++
++	return 0;
++}
++
++static int etron_ecc_get_status(struct spinand_device *spinand, u8 status)
++{
++	switch (status & STATUS_ECC_MASK) {
++	case STATUS_ECC_NO_BITFLIPS:
++		return 0;
++
++	case STATUS_ECC_HAS_BITFLIPS:
++		/* Between 1-7 bitflips were corrected */
++		return 7;
++
++	case STATUS_ECC_MASK:
++		/* Maximum bitflips were corrected */
++		return 8;
++
++	case STATUS_ECC_UNCOR_ERROR:
++		return -EBADMSG;
++	}
++
++	return -EINVAL;
++}
++
++static const struct mtd_ooblayout_ops etron_ooblayout = {
++	.ecc = etron_ooblayout_ecc,
++	.free = etron_ooblayout_free,
++};
++
++static const struct spinand_info etron_spinand_table[] = {
++	SPINAND_INFO("EM73D044VCx",
++		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x1f),
++		     // bpc, pagesize, oobsize, pagesperblock, bperlun, maxbadplun, ppl, lpt, #t
++		     NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 1, 1, 1),
++		     NAND_ECCREQ(8, 512),
++		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
++					      &write_cache_variants,
++					      &update_cache_variants),
++		     SPINAND_HAS_QE_BIT,
++		     SPINAND_ECCINFO(&etron_ooblayout, etron_ecc_get_status)),
++};
++
++static const struct spinand_manufacturer_ops etron_spinand_manuf_ops = {
++};
++
++const struct spinand_manufacturer etron_spinand_manufacturer = {
++	.id = SPINAND_MFR_ETRON,
++	.name = "Etron",
++	.chips = etron_spinand_table,
++	.nchips = ARRAY_SIZE(etron_spinand_table),
++	.ops = &etron_spinand_manuf_ops,
++};
+diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
+index 2066962d..11d38d2f 100644
+--- a/include/linux/mtd/spinand.h
++++ b/include/linux/mtd/spinand.h
+@@ -261,6 +261,7 @@ struct spinand_manufacturer {
+
+ /* SPI NAND manufacturers */
+ extern const struct spinand_manufacturer esmt_c8_spinand_manufacturer;
++extern const struct spinand_manufacturer etron_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;