target/linux/generic/pending-6.1/487-mtd-spinand-Add-support-for-Etron-EM73D044VCx.patch

   1 From f32085fc0b87049491b07e198d924d738a1a2834 Mon Sep 17 00:00:00 2001
   2 From: Daniel Danzberger <daniel@dd-wrt.com>
   3 Date: Wed, 3 Aug 2022 17:31:03 +0200
   4 Subject: [PATCH] mtd: spinand: Add support for Etron EM73D044VCx
   5
   6 Airoha is a new ARM platform based on Cortex-A53 which has recently been
   7 merged into linux-next.
   8
   9 Due to BootROM limitations on this platform, the Cortex-A53 can't run in
  10 Aarch64 mode and code must be compiled for 32-Bit ARM.
  11
  12 This support is based mostly on those linux-next commits backported
  13 for kernel 5.15.
  14
  15 Patches:
  16 1 - platform support = linux-next
  17 2 - clock driver = linux-next
  18 3 - gpio driver = linux-next
  19 4 - linux,usable-memory-range dts support = linux-next
  20 5 - mtd spinand driver
  21 6 - spi driver
  22 7 - pci driver (kconfig only, uses mediatek PCI) = linux-next
  23
  24 Still missing:
  25 - Ethernet driver
  26 - Sysupgrade support
  27
  28 A.t.m there exists one subtarget EN7523 with only one evaluation
  29 board.
  30
  31 The initramfs can be run with the following commands from u-boot:
  32 -
  33 u-boot> setenv bootfile \
  34         openwrt-airoha-airoha_en7523-evb-initramfs-kernel.bin
  35 u-boot> tftpboot
  36 u-boot> bootm 0x81800000
  37 -
  38
  39 Submitted-by: Daniel Danzberger <daniel@dd-wrt.com>
  40
  41 --- a/drivers/mtd/nand/spi/Makefile
  42 +++ b/drivers/mtd/nand/spi/Makefile
  43 @@ -1,3 +1,3 @@
  44  # SPDX-License-Identifier: GPL-2.0
  45 -spinand-objs := core.o ato.o esmt.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
  46 +spinand-objs := core.o ato.o esmt.o etron.o gigadevice.o macronix.o micron.o paragon.o toshiba.o winbond.o xtx.o
  47  obj-$(CONFIG_MTD_SPI_NAND) += spinand.o
  48 --- a/drivers/mtd/nand/spi/core.c
  49 +++ b/drivers/mtd/nand/spi/core.c
  50 @@ -939,6 +939,7 @@ static const struct nand_ops spinand_ops
  51  static const struct spinand_manufacturer *spinand_manufacturers[] = {
  52         &ato_spinand_manufacturer,
  53         &esmt_c8_spinand_manufacturer,
  54 +       &etron_spinand_manufacturer,
  55         &gigadevice_spinand_manufacturer,
  56         &macronix_spinand_manufacturer,
  57         &micron_spinand_manufacturer,
  58 --- /dev/null
  59 +++ b/drivers/mtd/nand/spi/etron.c
  60 @@ -0,0 +1,98 @@
  61 +// SPDX-License-Identifier: GPL-2.0
  62 +
  63 +#include <linux/device.h>
  64 +#include <linux/kernel.h>
  65 +#include <linux/mtd/spinand.h>
  66 +
  67 +#define SPINAND_MFR_ETRON                      0xd5
  68 +
  69 +
  70 +static SPINAND_OP_VARIANTS(read_cache_variants,
  71 +               SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, NULL, 0),
  72 +               SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
  73 +               SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
  74 +               SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
  75 +               SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
  76 +               SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
  77 +
  78 +static SPINAND_OP_VARIANTS(write_cache_variants,
  79 +               SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
  80 +               SPINAND_PROG_LOAD(true, 0, NULL, 0));
  81 +
  82 +static SPINAND_OP_VARIANTS(update_cache_variants,
  83 +               SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
  84 +               SPINAND_PROG_LOAD(false, 0, NULL, 0));
  85 +
  86 +static int etron_ooblayout_ecc(struct mtd_info *mtd, int section,
  87 +                                       struct mtd_oob_region *oobregion)
  88 +{
  89 +       if (section)
  90 +               return -ERANGE;
  91 +
  92 +       oobregion->offset = 72;
  93 +       oobregion->length = 56;
  94 +
  95 +       return 0;
  96 +}
  97 +
  98 +static int etron_ooblayout_free(struct mtd_info *mtd, int section,
  99 +                          struct mtd_oob_region *oobregion)
 100 +{
 101 +       if (section)
 102 +               return -ERANGE;
 103 +
 104 +       oobregion->offset = 1;
 105 +       oobregion->length = 71;
 106 +
 107 +       return 0;
 108 +}
 109 +
 110 +static int etron_ecc_get_status(struct spinand_device *spinand, u8 status)
 111 +{
 112 +       switch (status & STATUS_ECC_MASK) {
 113 +       case STATUS_ECC_NO_BITFLIPS:
 114 +               return 0;
 115 +
 116 +       case STATUS_ECC_HAS_BITFLIPS:
 117 +               /* Between 1-7 bitflips were corrected */
 118 +               return 7;
 119 +
 120 +       case STATUS_ECC_MASK:
 121 +               /* Maximum bitflips were corrected */
 122 +               return 8;
 123 +
 124 +       case STATUS_ECC_UNCOR_ERROR:
 125 +               return -EBADMSG;
 126 +       }
 127 +
 128 +       return -EINVAL;
 129 +}
 130 +
 131 +static const struct mtd_ooblayout_ops etron_ooblayout = {
 132 +       .ecc = etron_ooblayout_ecc,
 133 +       .free = etron_ooblayout_free,
 134 +};
 135 +
 136 +static const struct spinand_info etron_spinand_table[] = {
 137 +       SPINAND_INFO("EM73D044VCx",
 138 +                    SPINAND_ID(SPINAND_READID_METHOD_OPCODE_ADDR, 0x1f),
 139 +                    // bpc, pagesize, oobsize, pagesperblock, bperlun, maxbadplun, ppl, lpt, #t
 140 +                    NAND_MEMORG(1, 2048, 128, 64, 2048, 40, 1, 1, 1),
 141 +                    NAND_ECCREQ(8, 512),
 142 +                    SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
 143 +                                             &write_cache_variants,
 144 +                                             &update_cache_variants),
 145 +                    SPINAND_HAS_QE_BIT,
 146 +                    SPINAND_ECCINFO(&etron_ooblayout, etron_ecc_get_status)),
 147 +};
 148 +
 149 +static const struct spinand_manufacturer_ops etron_spinand_manuf_ops = {
 150 +};
 151 +
 152 +const struct spinand_manufacturer etron_spinand_manufacturer = {
 153 +       .id = SPINAND_MFR_ETRON,
 154 +       .name = "Etron",
 155 +       .chips = etron_spinand_table,
 156 +       .nchips = ARRAY_SIZE(etron_spinand_table),
 157 +       .ops = &etron_spinand_manuf_ops,
 158 +};
 159 --- a/include/linux/mtd/spinand.h
 160 +++ b/include/linux/mtd/spinand.h
 161 @@ -262,6 +262,7 @@ struct spinand_manufacturer {
 162  /* SPI NAND manufacturers */
 163  extern const struct spinand_manufacturer ato_spinand_manufacturer;
 164  extern const struct spinand_manufacturer esmt_c8_spinand_manufacturer;
 165 +extern const struct spinand_manufacturer etron_spinand_manufacturer;
 166  extern const struct spinand_manufacturer gigadevice_spinand_manufacturer;
 167  extern const struct spinand_manufacturer macronix_spinand_manufacturer;
 168  extern const struct spinand_manufacturer micron_spinand_manufacturer;