1 files changed, 367 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/au1550nd.c b/drivers/mtd/nand/raw/au1550nd.c
new file mode 100644
index 000000000..063a5e0b8
--- /dev/null
+++ b/drivers/mtd/nand/raw/au1550nd.c
@@ -0,0 +1,367 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Copyright (C) 2004 Embedded Edge, LLC
+ */
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/platform_device.h>
+#include <asm/io.h>
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1550nd.h>
+
+
+struct au1550nd_ctx {
+	struct nand_controller controller;
+	struct nand_chip chip;
+
+	int cs;
+	void __iomem *base;
+};
+
+static struct au1550nd_ctx *chip_to_au_ctx(struct nand_chip *this)
+{
+	return container_of(this, struct au1550nd_ctx, chip);
+}
+
+/**
+ * au_write_buf -  write buffer to chip
+ * @this:	NAND chip object
+ * @buf:	data buffer
+ * @len:	number of bytes to write
+ *
+ * write function for 8bit buswidth
+ */
+static void au_write_buf(struct nand_chip *this, const void *buf,
+			 unsigned int len)
+{
+	struct au1550nd_ctx *ctx = chip_to_au_ctx(this);
+	const u8 *p = buf;
+	int i;
+
+	for (i = 0; i < len; i++) {
+		writeb(p[i], ctx->base + MEM_STNAND_DATA);
+		wmb(); /* drain writebuffer */
+	}
+}
+
+/**
+ * au_read_buf -  read chip data into buffer
+ * @this:	NAND chip object
+ * @buf:	buffer to store date
+ * @len:	number of bytes to read
+ *
+ * read function for 8bit buswidth
+ */
+static void au_read_buf(struct nand_chip *this, void *buf,
+			unsigned int len)
+{
+	struct au1550nd_ctx *ctx = chip_to_au_ctx(this);
+	u8 *p = buf;
+	int i;
+
+	for (i = 0; i < len; i++) {
+		p[i] = readb(ctx->base + MEM_STNAND_DATA);
+		wmb(); /* drain writebuffer */
+	}
+}
+
+/**
+ * au_write_buf16 -  write buffer to chip
+ * @this:	NAND chip object
+ * @buf:	data buffer
+ * @len:	number of bytes to write
+ *
+ * write function for 16bit buswidth
+ */
+static void au_write_buf16(struct nand_chip *this, const void *buf,
+			   unsigned int len)
+{
+	struct au1550nd_ctx *ctx = chip_to_au_ctx(this);
+	const u16 *p = buf;
+	unsigned int i;
+
+	len >>= 1;
+	for (i = 0; i < len; i++) {
+		writew(p[i], ctx->base + MEM_STNAND_DATA);
+		wmb(); /* drain writebuffer */
+	}
+}
+
+/**
+ * au_read_buf16 -  read chip data into buffer
+ * @this:	NAND chip object
+ * @buf:	buffer to store date
+ * @len:	number of bytes to read
+ *
+ * read function for 16bit buswidth
+ */
+static void au_read_buf16(struct nand_chip *this, void *buf, unsigned int len)
+{
+	struct au1550nd_ctx *ctx = chip_to_au_ctx(this);
+	unsigned int i;
+	u16 *p = buf;
+
+	len >>= 1;
+	for (i = 0; i < len; i++) {
+		p[i] = readw(ctx->base + MEM_STNAND_DATA);
+		wmb(); /* drain writebuffer */
+	}
+}
+
+static int find_nand_cs(unsigned long nand_base)
+{
+	void __iomem *base =
+			(void __iomem *)KSEG1ADDR(AU1000_STATIC_MEM_PHYS_ADDR);
+	unsigned long addr, staddr, start, mask, end;
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		addr = 0x1000 + (i * 0x10);			/* CSx */
+		staddr = __raw_readl(base + addr + 0x08);	/* STADDRx */
+		/* figure out the decoded range of this CS */
+		start = (staddr << 4) & 0xfffc0000;
+		mask = (staddr << 18) & 0xfffc0000;
+		end = (start | (start - 1)) & ~(start ^ mask);
+		if ((nand_base >= start) && (nand_base < end))
+			return i;
+	}
+
+	return -ENODEV;
+}
+
+static int au1550nd_waitrdy(struct nand_chip *this, unsigned int timeout_ms)
+{
+	unsigned long timeout_jiffies = jiffies;
+
+	timeout_jiffies += msecs_to_jiffies(timeout_ms) + 1;
+	do {
+		if (alchemy_rdsmem(AU1000_MEM_STSTAT) & 0x1)
+			return 0;
+
+		usleep_range(10, 100);
+	} while (time_before(jiffies, timeout_jiffies));
+
+	return -ETIMEDOUT;
+}
+
+static int au1550nd_exec_instr(struct nand_chip *this,
+			       const struct nand_op_instr *instr)
+{
+	struct au1550nd_ctx *ctx = chip_to_au_ctx(this);
+	unsigned int i;
+	int ret = 0;
+
+	switch (instr->type) {
+	case NAND_OP_CMD_INSTR:
+		writeb(instr->ctx.cmd.opcode,
+		       ctx->base + MEM_STNAND_CMD);
+		/* Drain the writebuffer */
+		wmb();
+		break;
+
+	case NAND_OP_ADDR_INSTR:
+		for (i = 0; i < instr->ctx.addr.naddrs; i++) {
+			writeb(instr->ctx.addr.addrs[i],
+			       ctx->base + MEM_STNAND_ADDR);
+			/* Drain the writebuffer */
+			wmb();
+		}
+		break;
+
+	case NAND_OP_DATA_IN_INSTR:
+		if ((this->options & NAND_BUSWIDTH_16) &&
+		    !instr->ctx.data.force_8bit)
+			au_read_buf16(this, instr->ctx.data.buf.in,
+				      instr->ctx.data.len);
+		else
+			au_read_buf(this, instr->ctx.data.buf.in,
+				    instr->ctx.data.len);
+		break;
+
+	case NAND_OP_DATA_OUT_INSTR:
+		if ((this->options & NAND_BUSWIDTH_16) &&
+		    !instr->ctx.data.force_8bit)
+			au_write_buf16(this, instr->ctx.data.buf.out,
+				       instr->ctx.data.len);
+		else
+			au_write_buf(this, instr->ctx.data.buf.out,
+				     instr->ctx.data.len);
+		break;
+
+	case NAND_OP_WAITRDY_INSTR:
+		ret = au1550nd_waitrdy(this, instr->ctx.waitrdy.timeout_ms);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (instr->delay_ns)
+		ndelay(instr->delay_ns);
+
+	return ret;
+}
+
+static int au1550nd_exec_op(struct nand_chip *this,
+			    const struct nand_operation *op,
+			    bool check_only)
+{
+	struct au1550nd_ctx *ctx = chip_to_au_ctx(this);
+	unsigned int i;
+	int ret;
+
+	if (check_only)
+		return 0;
+
+	/* assert (force assert) chip enable */
+	alchemy_wrsmem((1 << (4 + ctx->cs)), AU1000_MEM_STNDCTL);
+	/* Drain the writebuffer */
+	wmb();
+
+	for (i = 0; i < op->ninstrs; i++) {
+		ret = au1550nd_exec_instr(this, &op->instrs[i]);
+		if (ret)
+			break;
+	}
+
+	/* deassert chip enable */
+	alchemy_wrsmem(0, AU1000_MEM_STNDCTL);
+	/* Drain the writebuffer */
+	wmb();
+
+	return ret;
+}
+
+static int au1550nd_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 au1550nd_ops = {
+	.exec_op = au1550nd_exec_op,
+	.attach_chip = au1550nd_attach_chip,
+};
+
+static int au1550nd_probe(struct platform_device *pdev)
+{
+	struct au1550nd_platdata *pd;
+	struct au1550nd_ctx *ctx;
+	struct nand_chip *this;
+	struct mtd_info *mtd;
+	struct resource *r;
+	int ret, cs;
+
+	pd = dev_get_platdata(&pdev->dev);
+	if (!pd) {
+		dev_err(&pdev->dev, "missing platform data\n");
+		return -ENODEV;
+	}
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		dev_err(&pdev->dev, "no NAND memory resource\n");
+		ret = -ENODEV;
+		goto out1;
+	}
+	if (request_mem_region(r->start, resource_size(r), "au1550-nand")) {
+		dev_err(&pdev->dev, "cannot claim NAND memory area\n");
+		ret = -ENOMEM;
+		goto out1;
+	}
+
+	ctx->base = ioremap(r->start, 0x1000);
+	if (!ctx->base) {
+		dev_err(&pdev->dev, "cannot remap NAND memory area\n");
+		ret = -ENODEV;
+		goto out2;
+	}
+
+	this = &ctx->chip;
+	mtd = nand_to_mtd(this);
+	mtd->dev.parent = &pdev->dev;
+
+	/* figure out which CS# r->start belongs to */
+	cs = find_nand_cs(r->start);
+	if (cs < 0) {
+		dev_err(&pdev->dev, "cannot detect NAND chipselect\n");
+		ret = -ENODEV;
+		goto out3;
+	}
+	ctx->cs = cs;
+
+	nand_controller_init(&ctx->controller);
+	ctx->controller.ops = &au1550nd_ops;
+	this->controller = &ctx->controller;
+
+	if (pd->devwidth)
+		this->options |= NAND_BUSWIDTH_16;
+
+	/*
+	 * 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.
+	 */
+	this->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
+
+	ret = nand_scan(this, 1);
+	if (ret) {
+		dev_err(&pdev->dev, "NAND scan failed with %d\n", ret);
+		goto out3;
+	}
+
+	mtd_device_register(mtd, pd->parts, pd->num_parts);
+
+	platform_set_drvdata(pdev, ctx);
+
+	return 0;
+
+out3:
+	iounmap(ctx->base);
+out2:
+	release_mem_region(r->start, resource_size(r));
+out1:
+	kfree(ctx);
+	return ret;
+}
+
+static void au1550nd_remove(struct platform_device *pdev)
+{
+	struct au1550nd_ctx *ctx = platform_get_drvdata(pdev);
+	struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct nand_chip *chip = &ctx->chip;
+	int ret;
+
+	ret = mtd_device_unregister(nand_to_mtd(chip));
+	WARN_ON(ret);
+	nand_cleanup(chip);
+	iounmap(ctx->base);
+	release_mem_region(r->start, 0x1000);
+	kfree(ctx);
+}
+
+static struct platform_driver au1550nd_driver = {
+	.driver = {
+		.name	= "au1550-nand",
+	},
+	.probe		= au1550nd_probe,
+	.remove_new	= au1550nd_remove,
+};
+
+module_platform_driver(au1550nd_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Embedded Edge, LLC");
+MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on Pb1550 board");