[PATCH v4 26/42] mtd: nand: add support for ts72xx
Nikita Shubin via B4 Relay
devnull+nikita.shubin.maquefel.me at kernel.org
Fri Sep 15 01:11:08 PDT 2023
From: Nikita Shubin <nikita.shubin at maquefel.me>
Technologic Systems has it's own nand controller implementation in CPLD.
Signed-off-by: Nikita Shubin <nikita.shubin at maquefel.me>
---
drivers/mtd/nand/raw/Kconfig | 7 +
drivers/mtd/nand/raw/Makefile | 1 +
drivers/mtd/nand/raw/technologic-nand-controller.c | 166 +++++++++++++++++++++
3 files changed, 174 insertions(+)
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index b523354dfb00..94788da1a169 100644
--- 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 d93e861d8ba7..b85161c3296b 100644
--- 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
index 000000000000..02430ed1e896
--- /dev/null
+++ b/drivers/mtd/nand/raw/technologic-nand-controller.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Technologic Systems TS72xx NAND controller driver
+ *
+ * Copyright (C) 2023 Nikita Shubin <nikita.shubin at maquefel.me>
+ *
+ * Derived from: plat_nand.c
+ * Author: Vitaly Wool <vitalywool at gmail.com>
+ */
+
+#include <linux/bits.h>
+#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)
+{
+ switch (chip->ecc.engine_type) {
+ case NAND_ECC_ENGINE_TYPE_SOFT:
+ if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
+ chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
+ break;
+ case NAND_ECC_ENGINE_TYPE_ON_HOST:
+ return -EINVAL;
+ default:
+ break;
+ }
+
+ 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 += BIT(TS72XX_NAND_CONTROL_ADDR_LINE);
+
+ bits = readb(addr) & ~GENMASK(2, 0);
+ 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 += BIT(TS72XX_NAND_BUSY_ADDR_LINE);
+
+ return !!(readb(addr) & BIT(5));
+}
+
+static int ts72xx_nand_probe(struct platform_device *pdev)
+{
+ struct ts72xx_nand_data *data;
+ struct fwnode_handle *child;
+ struct mtd_info *mtd;
+ int err;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*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);
+
+ child = fwnode_get_next_child_node(dev_fwnode(&pdev->dev), NULL);
+ if (!child)
+ return dev_err_probe(&pdev->dev, -ENXIO,
+ "ts72xx controller node should have exactly one child\n");
+
+ nand_set_flash_node(&data->chip, to_of_node(child));
+ 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)
+ goto err_handle_put;
+
+ err = mtd_device_parse_register(mtd, NULL, NULL, NULL, 0);
+ if (err)
+ goto err_clean_nand;
+
+ return 0;
+
+err_clean_nand:
+ nand_cleanup(&data->chip);
+err_handle_put:
+ fwnode_handle_put(child);
+ return err;
+}
+
+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);
+
--
2.39.2
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