path: root/target/linux/mpc83xx/patches-3.8/203-mtd-add-rbppc_nand-driver.patch

--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -463,6 +463,13 @@ config MTD_NAND_PLATFORM
 	  devices. You will need to provide platform-specific functions
 	  via platform_data.
 
+config MTD_NAND_RB_PPC
+	tristate "MikroTik RB333/600 NAND support"
+	depends on RB_PPC
+	help
+	  This option enables support for the NAND device on MikroTik
+	  RouterBOARD 333/600 series boards.
+
 config MTD_ALAUDA
 	tristate "MTD driver for Olympus MAUSB-10 and Fujifilm DPC-R1"
 	depends on USB
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_MTD_NAND_CM_X270)		+= cmx27
 obj-$(CONFIG_MTD_NAND_PXA3xx)		+= pxa3xx_nand.o
 obj-$(CONFIG_MTD_NAND_TMIO)		+= tmio_nand.o
 obj-$(CONFIG_MTD_NAND_PLATFORM)		+= plat_nand.o
+obj-$(CONFIG_MTD_NAND_RB_PPC)		+= rbppc_nand.o
 obj-$(CONFIG_MTD_ALAUDA)		+= alauda.o
 obj-$(CONFIG_MTD_NAND_PASEMI)		+= pasemi_nand.o
 obj-$(CONFIG_MTD_NAND_ORION)		+= orion_nand.o
--- /dev/null
+++ b/drivers/mtd/nand/rbppc_nand.c
@@ -0,0 +1,250 @@
+/*
+ * Copyright (C) 2008-2009 Noah Fontes <nfontes@transtruct.org>
+ * Copyright (C) 2009 Michael Guntsche <mike@it-loops.com>
+ * Copyright (C) Mikrotik 2007
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+
+#define DRV_NAME	"rbppc_nand"
+#define DRV_VERSION	"0.0.2"
+
+static struct mtd_info rmtd;
+static struct nand_chip rnand;
+
+struct rbppc_nand_info {
+	void *gpi;
+	void *gpo;
+	void *localbus;
+
+	unsigned gpio_rdy;
+	unsigned gpio_nce;
+	unsigned gpio_cle;
+	unsigned gpio_ale;
+	unsigned gpio_ctrls;
+};
+
+/* We must use the OOB layout from yaffs 1 if we want this to be recognized
+ * properly. Borrowed from the OpenWRT patches for the RB532.
+ *
+ * See <https://dev.openwrt.org/browser/trunk/target/linux/rb532/
+ * patches-2.6.28/025-rb532_nand_fixup.patch> for more details.
+ */
+static struct nand_ecclayout rbppc_nand_oob_16 = {
+	.eccbytes = 6,
+	.eccpos = { 8, 9, 10, 13, 14, 15 },
+	.oobavail = 9,
+	.oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
+};
+
+static struct mtd_partition rbppc_nand_partition_info[] = {
+	{
+		name: "kernel",
+		offset: 0,
+		size: 4 * 1024 * 1024,
+	},
+	{
+		name: "rootfs",
+		offset: MTDPART_OFS_NXTBLK,
+		size: MTDPART_SIZ_FULL,
+	},
+};
+
+static int rbppc_nand_dev_ready(struct mtd_info *mtd) {
+	struct nand_chip *chip = mtd->priv;
+	struct rbppc_nand_info *priv = chip->priv;
+
+	return in_be32(priv->gpi) & priv->gpio_rdy;
+}
+
+static void rbppc_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) {
+	struct nand_chip *chip = mtd->priv;
+	struct rbppc_nand_info *priv = chip->priv;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		unsigned val = in_be32(priv->gpo);
+		if (!(val & priv->gpio_nce)) {
+			/* make sure Local Bus has done NAND operations */
+			readb(priv->localbus);
+		}
+
+		if (ctrl & NAND_CLE) {
+			val |= priv->gpio_cle;
+		} else {
+			val &= ~priv->gpio_cle;
+		}
+		if (ctrl & NAND_ALE) {
+			val |= priv->gpio_ale;
+		} else {
+			val &= ~priv->gpio_ale;
+		}
+		if (!(ctrl & NAND_NCE)) {
+			val |= priv->gpio_nce;
+		} else {
+			val &= ~priv->gpio_nce;
+		}
+		out_be32(priv->gpo, val);
+
+		/* make sure GPIO output has changed */
+		val ^= in_be32(priv->gpo);
+		if (val & priv->gpio_ctrls) {
+			printk(KERN_ERR "rbppc_nand_hwcontrol: NAND GPO change failed 0x%08x\n", val);
+		}
+	}
+
+	if (cmd != NAND_CMD_NONE) writeb(cmd, chip->IO_ADDR_W);
+}
+
+static void rbppc_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+	struct nand_chip *chip = mtd->priv;
+	memcpy(buf, chip->IO_ADDR_R, len);
+}
+
+static unsigned init_ok = 0;
+
+static int rbppc_nand_probe(struct platform_device *pdev)
+{
+	struct device_node *gpio;
+	struct device_node *nnand;
+	struct resource res;
+	struct rbppc_nand_info *info;
+	void *baddr;
+	const unsigned *rdy, *nce, *cle, *ale;
+
+	printk(KERN_INFO "rbppc_nand_probe: MikroTik RouterBOARD 333/600 series NAND driver, version " DRV_VERSION "\n");
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+
+	rdy = of_get_property(pdev->dev.of_node, "rdy", NULL);
+	nce = of_get_property(pdev->dev.of_node, "nce", NULL);
+	cle = of_get_property(pdev->dev.of_node, "cle", NULL);
+	ale = of_get_property(pdev->dev.of_node, "ale", NULL);
+
+	if (!rdy || !nce || !cle || !ale) {
+		printk(KERN_ERR "rbppc_nand_probe: GPIO properties are missing\n");
+		goto err;
+	}
+	if (rdy[0] != nce[0] || rdy[0] != cle[0] || rdy[0] != ale[0]) {
+		printk(KERN_ERR "rbppc_nand_probe: Different GPIOs are not supported\n");
+		goto err;
+	}
+
+	gpio = of_find_node_by_phandle(rdy[0]);
+	if (!gpio) {
+		printk(KERN_ERR "rbppc_nand_probe: No GPIO<%x> node found\n", *rdy);
+		goto err;
+	}
+	if (of_address_to_resource(gpio, 0, &res)) {
+		printk(KERN_ERR "rbppc_nand_probe: No reg property in GPIO found\n");
+		goto err;
+	}
+	info->gpo = ioremap_nocache(res.start, res.end - res.start + 1);
+
+	if (!of_address_to_resource(gpio, 1, &res)) {
+		info->gpi = ioremap_nocache(res.start, res.end - res.start + 1);
+	} else {
+		info->gpi = info->gpo;
+	}
+	of_node_put(gpio);
+
+	info->gpio_rdy = 1 << (31 - rdy[1]);
+	info->gpio_nce = 1 << (31 - nce[1]);
+	info->gpio_cle = 1 << (31 - cle[1]);
+	info->gpio_ale = 1 << (31 - ale[1]);
+	info->gpio_ctrls = info->gpio_nce | info->gpio_cle | info->gpio_ale;
+
+	nnand = of_find_node_by_name(NULL, "nnand");
+	if (!nnand) {
+		printk("rbppc_nand_probe: No nNAND found\n");
+		goto err;
+	}
+	if (of_address_to_resource(nnand, 0, &res)) {
+		printk("rbppc_nand_probe: No reg property in nNAND found\n");
+		goto err;
+	}
+	of_node_put(nnand);
+	info->localbus = ioremap_nocache(res.start, res.end - res.start + 1);
+
+	if (of_address_to_resource(pdev->dev.of_node, 0, &res)) {
+	    printk("rbppc_nand_probe: No reg property found\n");
+	    goto err;
+	}
+	baddr = ioremap_nocache(res.start, res.end - res.start + 1);
+
+	memset(&rnand, 0, sizeof(rnand));
+	rnand.cmd_ctrl = rbppc_nand_cmd_ctrl;
+	rnand.dev_ready = rbppc_nand_dev_ready;
+	rnand.read_buf = rbppc_nand_read_buf;
+	rnand.IO_ADDR_W = baddr;
+	rnand.IO_ADDR_R = baddr;
+	rnand.priv = info;
+
+	memset(&rmtd, 0, sizeof(rmtd));
+	rnand.ecc.mode = NAND_ECC_SOFT;
+	rnand.ecc.layout = &rbppc_nand_oob_16;
+	rnand.chip_delay = 25;
+	rmtd.priv = &rnand;
+	rmtd.owner = THIS_MODULE;
+
+	if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)) {
+		printk(KERN_ERR "rbppc_nand_probe: RouterBOARD NAND device not found\n");
+		return -ENXIO;
+	}
+
+	mtd_device_parse_register(&rmtd, NULL, 0, rbppc_nand_partition_info, 2);
+	init_ok = 1;
+	return 0;
+
+err:
+	kfree(info);
+	return -1;
+}
+
+static struct of_device_id rbppc_nand_ids[] = {
+	{ .name = "nand", },
+	{ },
+};
+
+static struct platform_driver rbppc_nand_driver = {
+	.probe	= rbppc_nand_probe,
+	.driver	= {
+		.name = "rbppc-nand",
+		.owner = THIS_MODULE,
+		.of_match_table = rbppc_nand_ids,
+	},
+};
+
+static int __init rbppc_nand_init(void)
+{
+	return platform_driver_register(&rbppc_nand_driver);
+}
+
+static void __exit rbppc_nand_exit(void)
+{
+	platform_driver_unregister(&rbppc_nand_driver);
+}
+
+MODULE_AUTHOR("Mikrotikls SIA");
+MODULE_AUTHOR("Noah Fontes");
+MODULE_AUTHOR("Michael Guntsche");
+MODULE_DESCRIPTION("MikroTik RouterBOARD 333/600 series NAND driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(rbppc_nand_init);
+module_exit(rbppc_nand_exit);