nand: oxnas_nand: remove obsolete raw nand driver

Due to lack of maintenance and stall of development for a few years now,
and since no new features will ever be added upstream, remove support
for OX810 and OX820 nand.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230630-topic-oxnas-upstream-remove-v2-5-fb6ab3dea87c@linaro.org

diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index b523354..5b871e2 100644 (file)
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -204,13 +204,6 @@ config MTD_NAND_BCM47XXNFLASH
          registered by bcma as platform devices. This enables driver for
          NAND flash memories. For now only BCM4706 is supported.
 
-config MTD_NAND_OXNAS
-       tristate "Oxford Semiconductor NAND controller"
-       depends on ARCH_OXNAS || COMPILE_TEST
-       depends on HAS_IOMEM
-       help
-         This enables the NAND flash controller on Oxford Semiconductor SoCs.
-
 config MTD_NAND_MPC5121_NFC
        tristate "MPC5121 NAND controller"
        depends on PPC_MPC512x

diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index d93e861..25120a4 100644 (file)
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -26,7 +26,6 @@ obj-$(CONFIG_MTD_NAND_MARVELL)                += marvell_nand.o
 obj-$(CONFIG_MTD_NAND_PLATFORM)                += plat_nand.o
 obj-$(CONFIG_MTD_NAND_PASEMI)          += pasemi_nand.o
 obj-$(CONFIG_MTD_NAND_ORION)           += orion_nand.o
-obj-$(CONFIG_MTD_NAND_OXNAS)           += oxnas_nand.o
 obj-$(CONFIG_MTD_NAND_FSL_ELBC)                += fsl_elbc_nand.o
 obj-$(CONFIG_MTD_NAND_FSL_IFC)         += fsl_ifc_nand.o
 obj-$(CONFIG_MTD_NAND_FSL_UPM)         += fsl_upm.o

diff --git a/drivers/mtd/nand/raw/oxnas_nand.c b/drivers/mtd/nand/raw/oxnas_nand.c
deleted file mode 100644 (file)
index e3c9807..0000000
--- a/drivers/mtd/nand/raw/oxnas_nand.c
+++ /dev/null
@@ -1,209 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Oxford Semiconductor OXNAS NAND driver
-
- * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
- * Heavily based on plat_nand.c :
- * Author: Vitaly Wool <vitalywool@gmail.com>
- * Copyright (C) 2013 Ma Haijun <mahaijuns@gmail.com>
- * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
- */
-
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/clk.h>
-#include <linux/reset.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/rawnand.h>
-#include <linux/mtd/partitions.h>
-#include <linux/of.h>
-
-/* Nand commands */
-#define OXNAS_NAND_CMD_ALE             BIT(18)
-#define OXNAS_NAND_CMD_CLE             BIT(19)
-
-#define OXNAS_NAND_MAX_CHIPS   1
-
-struct oxnas_nand_ctrl {
-       struct nand_controller base;
-       void __iomem *io_base;
-       struct clk *clk;
-       struct nand_chip *chips[OXNAS_NAND_MAX_CHIPS];
-       unsigned int nchips;
-};
-
-static uint8_t oxnas_nand_read_byte(struct nand_chip *chip)
-{
-       struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);
-
-       return readb(oxnas->io_base);
-}
-
-static void oxnas_nand_read_buf(struct nand_chip *chip, u8 *buf, int len)
-{
-       struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);
-
-       ioread8_rep(oxnas->io_base, buf, len);
-}
-
-static void oxnas_nand_write_buf(struct nand_chip *chip, const u8 *buf,
-                                int len)
-{
-       struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);
-
-       iowrite8_rep(oxnas->io_base, buf, len);
-}
-
-/* Single CS command control */
-static void oxnas_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
-                               unsigned int ctrl)
-{
-       struct oxnas_nand_ctrl *oxnas = nand_get_controller_data(chip);
-
-       if (ctrl & NAND_CLE)
-               writeb(cmd, oxnas->io_base + OXNAS_NAND_CMD_CLE);
-       else if (ctrl & NAND_ALE)
-               writeb(cmd, oxnas->io_base + OXNAS_NAND_CMD_ALE);
-}
-
-/*
- * Probe for the NAND device.
- */
-static int oxnas_nand_probe(struct platform_device *pdev)
-{
-       struct device_node *np = pdev->dev.of_node;
-       struct device_node *nand_np;
-       struct oxnas_nand_ctrl *oxnas;
-       struct nand_chip *chip;
-       struct mtd_info *mtd;
-       int count = 0;
-       int err = 0;
-       int i;
-
-       /* Allocate memory for the device structure (and zero it) */
-       oxnas = devm_kzalloc(&pdev->dev, sizeof(*oxnas),
-                            GFP_KERNEL);
-       if (!oxnas)
-               return -ENOMEM;
-
-       nand_controller_init(&oxnas->base);
-
-       oxnas->io_base = devm_platform_ioremap_resource(pdev, 0);
-       if (IS_ERR(oxnas->io_base))
-               return PTR_ERR(oxnas->io_base);
-
-       oxnas->clk = devm_clk_get(&pdev->dev, NULL);
-       if (IS_ERR(oxnas->clk))
-               oxnas->clk = NULL;
-
-       /* Only a single chip node is supported */
-       count = of_get_child_count(np);
-       if (count > 1)
-               return -EINVAL;
-
-       err = clk_prepare_enable(oxnas->clk);
-       if (err)
-               return err;
-
-       device_reset_optional(&pdev->dev);
-
-       for_each_child_of_node(np, nand_np) {
-               chip = devm_kzalloc(&pdev->dev, sizeof(struct nand_chip),
-                                   GFP_KERNEL);
-               if (!chip) {
-                       err = -ENOMEM;
-                       goto err_release_child;
-               }
-
-               chip->controller = &oxnas->base;
-
-               nand_set_flash_node(chip, nand_np);
-               nand_set_controller_data(chip, oxnas);
-
-               mtd = nand_to_mtd(chip);
-               mtd->dev.parent = &pdev->dev;
-               mtd->priv = chip;
-
-               chip->legacy.cmd_ctrl = oxnas_nand_cmd_ctrl;
-               chip->legacy.read_buf = oxnas_nand_read_buf;
-               chip->legacy.read_byte = oxnas_nand_read_byte;
-               chip->legacy.write_buf = oxnas_nand_write_buf;
-               chip->legacy.chip_delay = 30;
-
-               /* Scan to find existence of the device */
-               err = nand_scan(chip, 1);
-               if (err)
-                       goto err_release_child;
-
-               err = mtd_device_register(mtd, NULL, 0);
-               if (err)
-                       goto err_cleanup_nand;
-
-               oxnas->chips[oxnas->nchips++] = chip;
-       }
-
-       /* Exit if no chips found */
-       if (!oxnas->nchips) {
-               err = -ENODEV;
-               goto err_clk_unprepare;
-       }
-
-       platform_set_drvdata(pdev, oxnas);
-
-       return 0;
-
-err_cleanup_nand:
-       nand_cleanup(chip);
-err_release_child:
-       of_node_put(nand_np);
-
-       for (i = 0; i < oxnas->nchips; i++) {
-               chip = oxnas->chips[i];
-               WARN_ON(mtd_device_unregister(nand_to_mtd(chip)));
-               nand_cleanup(chip);
-       }
-
-err_clk_unprepare:
-       clk_disable_unprepare(oxnas->clk);
-       return err;
-}
-
-static void oxnas_nand_remove(struct platform_device *pdev)
-{
-       struct oxnas_nand_ctrl *oxnas = platform_get_drvdata(pdev);
-       struct nand_chip *chip;
-       int i;
-
-       for (i = 0; i < oxnas->nchips; i++) {
-               chip = oxnas->chips[i];
-               WARN_ON(mtd_device_unregister(nand_to_mtd(chip)));
-               nand_cleanup(chip);
-       }
-
-       clk_disable_unprepare(oxnas->clk);
-}
-
-static const struct of_device_id oxnas_nand_match[] = {
-       { .compatible = "oxsemi,ox820-nand" },
-       {},
-};
-MODULE_DEVICE_TABLE(of, oxnas_nand_match);
-
-static struct platform_driver oxnas_nand_driver = {
-       .probe  = oxnas_nand_probe,
-       .remove_new = oxnas_nand_remove,
-       .driver = {
-               .name           = "oxnas_nand",
-               .of_match_table = oxnas_nand_match,
-       },
-};
-
-module_platform_driver(oxnas_nand_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
-MODULE_DESCRIPTION("Oxnas NAND driver");
-MODULE_ALIAS("platform:oxnas_nand");