From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 .../oxnas/files/drivers/mtd/nand/oxnas_nand.c      | 102 +++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c

(limited to 'target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c')

diff --git a/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c b/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c
new file mode 100644
index 0000000..55eb009
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c
@@ -0,0 +1,102 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/mtd/nand.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <mach/utils.h>
+
+/* nand commands */
+#define NAND_CMD_ALE		BIT(18)
+#define NAND_CMD_CLE		BIT(19)
+#define NAND_CMD_CS		0
+#define NAND_CMD_RESET		0xff
+#define NAND_CMD		(NAND_CMD_CS | NAND_CMD_CLE)
+#define NAND_ADDR		(NAND_CMD_CS | NAND_CMD_ALE)
+#define NAND_DATA		(NAND_CMD_CS)
+
+static void oxnas_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+	struct nand_chip *this = mtd->priv;
+	unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		nandaddr &= ~(NAND_CMD | NAND_ADDR);
+		if (ctrl & NAND_CLE)
+			nandaddr |= NAND_CMD;
+		else if (ctrl & NAND_ALE)
+			nandaddr |= NAND_ADDR;
+		this->IO_ADDR_W = (void __iomem *) nandaddr;
+	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, (void __iomem *) nandaddr);
+}
+
+static int oxnas_nand_probe(struct platform_device *pdev)
+{
+	/* enable clock and release static block reset */
+	struct clk *clk = of_clk_get(pdev->dev.of_node, 0);
+
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	clk_prepare_enable(clk);
+	device_reset(&pdev->dev);
+
+	return 0;
+}
+
+/* allow users to override the partition in DT using the cmdline */
+static const char * part_probes[] = { "cmdlinepart", "ofpart", NULL };
+
+static struct platform_nand_data oxnas_nand_data = {
+	.chip = {
+		.nr_chips		= 1,
+		.chip_delay		= 30,
+		.part_probe_types	= part_probes,
+	},
+	.ctrl = {
+		.probe		= oxnas_nand_probe,
+		.cmd_ctrl	= oxnas_cmd_ctrl,
+	}
+};
+
+/*
+ * Try to find the node inside the DT. If it is available attach out
+ * platform_nand_data
+ */
+static int __init oxnas_register_nand(void)
+{
+	struct device_node *node;
+	struct platform_device *pdev;
+
+	node = of_find_compatible_node(NULL, NULL, "plxtech,nand-nas782x");
+	if (!node)
+		return -ENOENT;
+	pdev = of_find_device_by_node(node);
+	if (!pdev)
+		return -EINVAL;
+	pdev->dev.platform_data = &oxnas_nand_data;
+	of_node_put(node);
+	return 0;
+}
+
+subsys_initcall(oxnas_register_nand);
+
+static const struct of_device_id oxnas_nand_ids[] = {
+	{ .compatible = "plxtech,nand-nas782x"},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, oxnas_nand_ids);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ma Haijun");
+MODULE_DESCRIPTION("NAND glue for Oxnas platforms");
+MODULE_ALIAS("platform:oxnas_nand");
-- 
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