mtd: move NAND files into a raw/ subdirectory

NAND flavors, like serial and parallel, have a lot in common and would
benefit to share code. Let's move raw (parallel) NAND specific code in a
raw/ subdirectory, to ease the addition of a core file in nand/ and the
introduction of a spi/ subdirectory specific to SPI NANDs.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

1 files changed, 175 insertions, 0 deletions

diff --git a/drivers/mtd/nand/raw/nand.c b/drivers/mtd/nand/raw/nand.c
new file mode 100644
index 0000000000..bca51ffbf2
--- /dev/null
+++ b/drivers/mtd/nand/raw/nand.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2005
+ * 2N Telekomunikace, a.s. <www.2n.cz>
+ * Ladislav Michl <michl@2n.cz>
+ */
+
+#include <common.h>
+#include <nand.h>
+#include <errno.h>
+#include <linux/mtd/concat.h>
+
+#ifndef CONFIG_SYS_NAND_BASE_LIST
+#define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
+#endif
+
+int nand_curr_device = -1;
+
+static struct mtd_info *nand_info[CONFIG_SYS_MAX_NAND_DEVICE];
+
+#ifndef CONFIG_SYS_NAND_SELF_INIT
+static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
+static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
+#endif
+
+static char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
+
+static unsigned long total_nand_size; /* in kiB */
+
+struct mtd_info *get_nand_dev_by_index(int dev)
+{
+	if (dev < 0 || dev >= CONFIG_SYS_MAX_NAND_DEVICE || !nand_info[dev] ||
+	    !nand_info[dev]->name)
+		return NULL;
+
+	return nand_info[dev];
+}
+
+int nand_mtd_to_devnum(struct mtd_info *mtd)
+{
+	int i;
+
+	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
+		if (mtd && get_nand_dev_by_index(i) == mtd)
+			return i;
+	}
+
+	return -ENODEV;
+}
+
+/* Register an initialized NAND mtd device with the U-Boot NAND command. */
+int nand_register(int devnum, struct mtd_info *mtd)
+{
+	if (devnum >= CONFIG_SYS_MAX_NAND_DEVICE)
+		return -EINVAL;
+
+	nand_info[devnum] = mtd;
+
+	sprintf(dev_name[devnum], "nand%d", devnum);
+	mtd->name = dev_name[devnum];
+
+#ifdef CONFIG_MTD_DEVICE
+	/*
+	 * Add MTD device so that we can reference it later
+	 * via the mtdcore infrastructure (e.g. ubi).
+	 */
+	add_mtd_device(mtd);
+#endif
+
+	total_nand_size += mtd->size / 1024;
+
+	if (nand_curr_device == -1)
+		nand_curr_device = devnum;
+
+	return 0;
+}
+
+#ifndef CONFIG_SYS_NAND_SELF_INIT
+static void nand_init_chip(int i)
+{
+	struct nand_chip *nand = &nand_chip[i];
+	struct mtd_info *mtd = nand_to_mtd(nand);
+	ulong base_addr = base_address[i];
+	int maxchips = CONFIG_SYS_NAND_MAX_CHIPS;
+
+	if (maxchips < 1)
+		maxchips = 1;
+
+	nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
+
+	if (board_nand_init(nand))
+		return;
+
+	if (nand_scan(mtd, maxchips))
+		return;
+
+	nand_register(i, mtd);
+}
+#endif
+
+#ifdef CONFIG_MTD_CONCAT
+static void create_mtd_concat(void)
+{
+	struct mtd_info *nand_info_list[CONFIG_SYS_MAX_NAND_DEVICE];
+	int nand_devices_found = 0;
+	int i;
+
+	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
+		struct mtd_info *mtd = get_nand_dev_by_index(i);
+		if (mtd != NULL) {
+			nand_info_list[nand_devices_found] = mtd;
+			nand_devices_found++;
+		}
+	}
+	if (nand_devices_found > 1) {
+		struct mtd_info *mtd;
+		char c_mtd_name[16];
+
+		/*
+		 * We detected multiple devices. Concatenate them together.
+		 */
+		sprintf(c_mtd_name, "nand%d", nand_devices_found);
+		mtd = mtd_concat_create(nand_info_list, nand_devices_found,
+					c_mtd_name);
+
+		if (mtd == NULL)
+			return;
+
+		nand_register(nand_devices_found, mtd);
+	}
+
+	return;
+}
+#else
+static void create_mtd_concat(void)
+{
+}
+#endif
+
+unsigned long nand_size(void)
+{
+	return total_nand_size;
+}
+
+void nand_init(void)
+{
+	static int initialized;
+
+	/*
+	 * Avoid initializing NAND Flash multiple times,
+	 * otherwise it will calculate a wrong total size.
+	 */
+	if (initialized)
+		return;
+	initialized = 1;
+
+#ifdef CONFIG_SYS_NAND_SELF_INIT
+	board_nand_init();
+#else
+	int i;
+
+	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
+		nand_init_chip(i);
+#endif
+
+#ifdef CONFIG_SYS_NAND_SELECT_DEVICE
+	/*
+	 * Select the chip in the board/cpu specific driver
+	 */
+	board_nand_select_device(mtd_to_nand(get_nand_dev_by_index(nand_curr_device)),
+				 nand_curr_device);
+#endif
+
+	create_mtd_concat();
+}