mtd: nand: add support for ts72xx

Technologic Systems has it's own nand controller implementation in CPLD.

This patch adds support for TS-72XX boards family.

Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>

diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index b523354dfb00c0beeec82888806045e2b114b1d5..94788da1a169cb988f4943b094d05d970ee24066 100644 (file)
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -456,6 +456,13 @@ config MTD_NAND_RENESAS
          Enables support for the NAND controller found on Renesas R-Car
          Gen3 and RZ/N1 SoC families.
 
+config MTD_NAND_TS72XX
+       bool "ts72xx NAND controller"
+       depends on ARCH_EP93XX && HAS_IOMEM
+       help
+         Enables support for NAND controller on ts72xx SBCs.
+         This is a legacy driver based on gen_nand.
+
 comment "Misc"
 
 config MTD_SM_COMMON

diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index 917cdfb815b9f19f16e0a8d58529ec2b5da91107..783e990a00780aeeaf72c307d41eef55ca04e173 100644 (file)
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -23,6 +23,7 @@ omap2_nand-objs := omap2.o
 obj-$(CONFIG_MTD_NAND_OMAP2)           += omap2_nand.o
 obj-$(CONFIG_MTD_NAND_OMAP_BCH_BUILD)  += omap_elm.o
 obj-$(CONFIG_MTD_NAND_MARVELL)         += marvell_nand.o
+obj-$(CONFIG_MTD_NAND_TS72XX)          += technologic-nand-controller.o
 obj-$(CONFIG_MTD_NAND_PLATFORM)                += plat_nand.o
 obj-$(CONFIG_MTD_NAND_PASEMI)          += pasemi_nand.o
 obj-$(CONFIG_MTD_NAND_ORION)           += orion_nand.o

diff --git a/drivers/mtd/nand/raw/technologic-nand-controller.c b/drivers/mtd/nand/raw/technologic-nand-controller.c
new file mode 100644 (file)
index 0000000..09aeada
--- /dev/null
+++ b/drivers/mtd/nand/raw/technologic-nand-controller.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Technologic Systems TS72xx NAND controller driver
+ *
+ * Copyright (C) 2023 Nikita Shubin <nikita.shubin@maquefel.me>
+ *
+ * derived: plat_nand.c
+ *  Author: Vitaly Wool <vitalywool@gmail.com>
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/platnand.h>
+
+#define TS72XX_NAND_CONTROL_ADDR_LINE  22      /* 0xN0400000 */
+#define TS72XX_NAND_BUSY_ADDR_LINE     23      /* 0xN0800000 */
+
+struct ts72xx_nand_data {
+       struct nand_controller  controller;
+       struct nand_chip        chip;
+       void __iomem            *io_base;
+};
+
+static int ts72xx_nand_attach_chip(struct nand_chip *chip)
+{
+       if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&
+           chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
+               chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
+
+       return 0;
+}
+
+static const struct nand_controller_ops ts72xx_nand_ops = {
+       .attach_chip = ts72xx_nand_attach_chip,
+};
+
+static void ts72xx_nand_hwcontrol(struct nand_chip *chip,
+                                 int cmd, unsigned int ctrl)
+{
+       if (ctrl & NAND_CTRL_CHANGE) {
+               void __iomem *addr = chip->legacy.IO_ADDR_R;
+               unsigned char bits;
+
+               addr += (1 << TS72XX_NAND_CONTROL_ADDR_LINE);
+
+               bits = readb(addr) & ~0x07;
+               bits |= (ctrl & NAND_NCE) << 2; /* bit 0 -> bit 2 */
+               bits |= (ctrl & NAND_CLE);      /* bit 1 -> bit 1 */
+               bits |= (ctrl & NAND_ALE) >> 2; /* bit 2 -> bit 0 */
+
+               writeb(bits, addr);
+       }
+
+       if (cmd != NAND_CMD_NONE)
+               writeb(cmd, chip->legacy.IO_ADDR_W);
+}
+
+static int ts72xx_nand_device_ready(struct nand_chip *chip)
+{
+       void __iomem *addr = chip->legacy.IO_ADDR_R;
+
+       addr += (1 << TS72XX_NAND_BUSY_ADDR_LINE);
+
+       return !!(readb(addr) & 0x20);
+}
+
+static int ts72xx_nand_probe(struct platform_device *pdev)
+{
+       struct ts72xx_nand_data *data;
+       struct mtd_info *mtd;
+       int err = 0;
+
+       /* Allocate memory for the device structure (and zero it) */
+       data = devm_kzalloc(&pdev->dev, sizeof(struct ts72xx_nand_data),
+                           GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       data->controller.ops = &ts72xx_nand_ops;
+       nand_controller_init(&data->controller);
+       data->chip.controller = &data->controller;
+
+       data->io_base = devm_platform_ioremap_resource(pdev, 0);
+       if (IS_ERR(data->io_base))
+               return PTR_ERR(data->io_base);
+
+       nand_set_flash_node(&data->chip, pdev->dev.of_node);
+       mtd = nand_to_mtd(&data->chip);
+       mtd->dev.parent = &pdev->dev;
+
+       data->chip.legacy.IO_ADDR_R = data->io_base;
+       data->chip.legacy.IO_ADDR_W = data->io_base;
+       data->chip.legacy.cmd_ctrl = ts72xx_nand_hwcontrol;
+       data->chip.legacy.dev_ready = ts72xx_nand_device_ready;
+
+       platform_set_drvdata(pdev, data);
+
+       /*
+        * This driver assumes that the default ECC engine should be TYPE_SOFT.
+        * Set ->engine_type before registering the NAND devices in order to
+        * provide a driver specific default value.
+        */
+       data->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
+
+       /* Scan to find existence of the device */
+       err = nand_scan(&data->chip, 1);
+       if (err)
+               return err;
+
+       err = mtd_device_parse_register(mtd, NULL, NULL,
+                                       NULL, 0);
+
+       if (!err)
+               return err;
+
+       nand_cleanup(&data->chip);
+
+       return 0;
+}
+
+static void ts72xx_nand_remove(struct platform_device *pdev)
+{
+       struct ts72xx_nand_data *data = platform_get_drvdata(pdev);
+       struct nand_chip *chip = &data->chip;
+       int ret;
+
+       ret = mtd_device_unregister(nand_to_mtd(chip));
+       WARN_ON(ret);
+       nand_cleanup(chip);
+}
+
+static const struct of_device_id ts72xx_id_table[] = {
+       { .compatible = "technologic,ts7200-nand" },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ts72xx_id_table);
+
+static struct platform_driver ts72xx_nand_driver = {
+       .driver = {
+               .name = "ts72xx-nand",
+               .of_match_table = ts72xx_id_table,
+       },
+       .probe = ts72xx_nand_probe,
+       .remove_new = ts72xx_nand_remove,
+};
+module_platform_driver(ts72xx_nand_driver);
+