mtd: nand: driver for Nomadik 8815 SoC (on NHK8815 board)

Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

3 files changed, 257 insertions, 0 deletions

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 2c9a0ed..2fda0b6 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -443,6 +443,12 @@ config MTD_NAND_MXC
 	  This enables the driver for the NAND flash controller on the
 	  MXC processors.
 
+config MTD_NAND_NOMADIK
+	tristate "ST Nomadik 8815 NAND support"
+	depends on ARCH_NOMADIK
+	help
+	  Driver for the NAND flash controller on the Nomadik, with ECC.
+
 config MTD_NAND_SH_FLCTL
 	tristate "Support for NAND on Renesas SuperH FLCTL"
 	depends on MTD_NAND && SUPERH && CPU_SUBTYPE_SH7723
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 4f7b189..6950d3d 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -41,5 +41,6 @@ obj-$(CONFIG_MTD_NAND_MXC)		+= mxc_nand.o
 obj-$(CONFIG_MTD_NAND_SOCRATES)		+= socrates_nand.o
 obj-$(CONFIG_MTD_NAND_TXX9NDFMC)	+= txx9ndfmc.o
 obj-$(CONFIG_MTD_NAND_W90P910)		+= w90p910_nand.o
+obj-$(CONFIG_MTD_NAND_NOMADIK)		+= nomadik_nand.o
 
 nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/nomadik_nand.c b/drivers/mtd/nand/nomadik_nand.c
new file mode 100644
index 0000000..7c302d5
--- /dev/null
+++ b/drivers/mtd/nand/nomadik_nand.c
@@ -0,0 +1,250 @@
+/*
+ *  drivers/mtd/nand/nomadik_nand.c
+ *
+ *  Overview:
+ *  	Driver for on-board NAND flash on Nomadik Platforms
+ *
+ * Copyright © 2007 STMicroelectronics Pvt. Ltd.
+ * Author: Sachin Verma <sachin.verma@st.com>
+ *
+ * Copyright © 2009 Alessandro Rubini
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/partitions.h>
+#include <linux/io.h>
+#include <mach/nand.h>
+#include <mach/fsmc.h>
+
+#include <mtd/mtd-abi.h>
+
+struct nomadik_nand_host {
+	struct mtd_info		mtd;
+	struct nand_chip	nand;
+	void __iomem *data_va;
+	void __iomem *cmd_va;
+	void __iomem *addr_va;
+	struct nand_bbt_descr *bbt_desc;
+};
+
+static struct nand_ecclayout nomadik_ecc_layout = {
+	.eccbytes = 3 * 4,
+	.eccpos = { /* each subpage has 16 bytes: pos 2,3,4 hosts ECC */
+		0x02, 0x03, 0x04,
+		0x12, 0x13, 0x14,
+		0x22, 0x23, 0x24,
+		0x32, 0x33, 0x34},
+	/* let's keep bytes 5,6,7 for us, just in case we change ECC algo */
+	.oobfree = { {0x08, 0x08}, {0x18, 0x08}, {0x28, 0x08}, {0x38, 0x08} },
+};
+
+static void nomadik_ecc_control(struct mtd_info *mtd, int mode)
+{
+	/* No need to enable hw ecc, it's on by default */
+}
+
+static void nomadik_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+	struct nand_chip *nand = mtd->priv;
+	struct nomadik_nand_host *host = nand->priv;
+
+	if (cmd == NAND_CMD_NONE)
+		return;
+
+	if (ctrl & NAND_CLE)
+		writeb(cmd, host->cmd_va);
+	else
+		writeb(cmd, host->addr_va);
+}
+
+static int nomadik_nand_probe(struct platform_device *pdev)
+{
+	struct nomadik_nand_platform_data *pdata = pdev->dev.platform_data;
+	struct nomadik_nand_host *host;
+	struct mtd_info *mtd;
+	struct nand_chip *nand;
+	struct resource *res;
+	int ret = 0;
+
+	/* Allocate memory for the device structure (and zero it) */
+	host = kzalloc(sizeof(struct nomadik_nand_host), GFP_KERNEL);
+	if (!host) {
+		dev_err(&pdev->dev, "Failed to allocate device structure.\n");
+		return -ENOMEM;
+	}
+
+	/* Call the client's init function, if any */
+	if (pdata->init)
+		ret = pdata->init();
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Init function failed\n");
+		goto err;
+	}
+
+	/* ioremap three regions */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_addr");
+	if (!res) {
+		ret = -EIO;
+		goto err_unmap;
+	}
+	host->addr_va = ioremap(res->start, res->end - res->start + 1);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
+	if (!res) {
+		ret = -EIO;
+		goto err_unmap;
+	}
+	host->data_va = ioremap(res->start, res->end - res->start + 1);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_cmd");
+	if (!res) {
+		ret = -EIO;
+		goto err_unmap;
+	}
+	host->cmd_va = ioremap(res->start, res->end - res->start + 1);
+
+	if (!host->addr_va || !host->data_va || !host->cmd_va) {
+		ret = -ENOMEM;
+		goto err_unmap;
+	}
+
+	/* Link all private pointers */
+	mtd = &host->mtd;
+	nand = &host->nand;
+	mtd->priv = nand;
+	nand->priv = host;
+
+	host->mtd.owner = THIS_MODULE;
+	nand->IO_ADDR_R = host->data_va;
+	nand->IO_ADDR_W = host->data_va;
+	nand->cmd_ctrl = nomadik_cmd_ctrl;
+
+	/*
+	 * This stanza declares ECC_HW but uses soft routines. It's because
+	 * HW claims to make the calculation but not the correction. However,
+	 * I haven't managed to get the desired data out of it until now.
+	 */
+	nand->ecc.mode = NAND_ECC_SOFT;
+	nand->ecc.layout = &nomadik_ecc_layout;
+	nand->ecc.hwctl = nomadik_ecc_control;
+	nand->ecc.size = 512;
+	nand->ecc.bytes = 3;
+
+	nand->options = pdata->options;
+
+	/*
+	 * Scan to find existance of the device
+	 */
+	if (nand_scan(&host->mtd, 1)) {
+		ret = -ENXIO;
+		goto err_unmap;
+	}
+
+#ifdef CONFIG_MTD_PARTITIONS
+	add_mtd_partitions(&host->mtd, pdata->parts, pdata->nparts);
+#else
+	pr_info("Registering %s as whole device\n", mtd->name);
+	add_mtd_device(mtd);
+#endif
+
+	platform_set_drvdata(pdev, host);
+	return 0;
+
+ err_unmap:
+	if (host->cmd_va)
+		iounmap(host->cmd_va);
+	if (host->data_va)
+		iounmap(host->data_va);
+	if (host->addr_va)
+		iounmap(host->addr_va);
+ err:
+	kfree(host);
+	return ret;
+}
+
+/*
+ * Clean up routine
+ */
+static int nomadik_nand_remove(struct platform_device *pdev)
+{
+	struct nomadik_nand_host *host = platform_get_drvdata(pdev);
+	struct nomadik_nand_platform_data *pdata = pdev->dev.platform_data;
+
+	if (pdata->exit)
+		pdata->exit();
+
+	if (host) {
+		iounmap(host->cmd_va);
+		iounmap(host->data_va);
+		iounmap(host->addr_va);
+		kfree(host);
+	}
+	return 0;
+}
+
+static int nomadik_nand_suspend(struct device *dev)
+{
+	struct nomadik_nand_host *host = dev_get_drvdata(dev);
+	int ret = 0;
+	if (host)
+		ret = host->mtd.suspend(&host->mtd);
+	return ret;
+}
+
+static int nomadik_nand_resume(struct device *dev)
+{
+	struct nomadik_nand_host *host = dev_get_drvdata(dev);
+	if (host)
+		host->mtd.resume(&host->mtd);
+	return 0;
+}
+
+static struct dev_pm_ops nomadik_nand_pm_ops = {
+	.suspend = nomadik_nand_suspend,
+	.resume = nomadik_nand_resume,
+};
+
+static struct platform_driver nomadik_nand_driver = {
+	.probe = nomadik_nand_probe,
+	.remove = nomadik_nand_remove,
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "nomadik_nand",
+		.pm = &nomadik_nand_pm_ops,
+	},
+};
+
+static int __init nand_nomadik_init(void)
+{
+	pr_info("Nomadik NAND driver\n");
+	return platform_driver_register(&nomadik_nand_driver);
+}
+
+static void __exit nand_nomadik_exit(void)
+{
+	platform_driver_unregister(&nomadik_nand_driver);
+}
+
+module_init(nand_nomadik_init);
+module_exit(nand_nomadik_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("ST Microelectronics (sachin.verma@st.com)");
+MODULE_DESCRIPTION("NAND driver for Nomadik Platform");