1/*
2 *  drivers/mtd/autcpu12.c
3 *
4 *  Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
5 *
6 *  Derived from drivers/mtd/spia.c
7 *	 Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
8 *
9 * $Id: autcpu12.c,v 1.1.1.1 2007/08/03 18:52:44 Exp $
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 *  Overview:
16 *   This is a device driver for the NAND flash device found on the
17 *   autronix autcpu12 board, which is a SmartMediaCard. It supports
18 *   16MiB, 32MiB and 64MiB cards.
19 *
20 *
21 *	02-12-2002 TG	Cleanup of module params
22 *
23 *	02-20-2002 TG	adjusted for different rd/wr adress support
24 *			added support for read device ready/busy line
25 *			added page_cache
26 *
27 *	10-06-2002 TG	128K card support added
28 */
29
30#include <linux/slab.h>
31#include <linux/init.h>
32#include <linux/module.h>
33#include <linux/mtd/mtd.h>
34#include <linux/mtd/nand.h>
35#include <linux/mtd/partitions.h>
36#include <asm/io.h>
37#include <asm/arch/hardware.h>
38#include <asm/sizes.h>
39#include <asm/arch/autcpu12.h>
40
41/*
42 * MTD structure for AUTCPU12 board
43 */
44static struct mtd_info *autcpu12_mtd = NULL;
45static void __iomem *autcpu12_fio_base;
46
47/*
48 * Define partitions for flash devices
49 */
50static struct mtd_partition partition_info16k[] = {
51	{ .name		= "AUTCPU12 flash partition 1",
52	  .offset	= 0,
53	  .size		= 8 * SZ_1M },
54	{ .name		= "AUTCPU12 flash partition 2",
55	  .offset	= 8 * SZ_1M,
56	  .size		= 8 * SZ_1M },
57};
58
59static struct mtd_partition partition_info32k[] = {
60	{ .name		= "AUTCPU12 flash partition 1",
61	  .offset	= 0,
62	  .size		= 8 * SZ_1M },
63	{ .name		= "AUTCPU12 flash partition 2",
64	  .offset	= 8 * SZ_1M,
65	  .size		= 24 * SZ_1M },
66};
67
68static struct mtd_partition partition_info64k[] = {
69	{ .name		= "AUTCPU12 flash partition 1",
70	  .offset	= 0,
71	  .size		= 16 * SZ_1M },
72	{ .name		= "AUTCPU12 flash partition 2",
73	  .offset	= 16 * SZ_1M,
74	  .size		= 48 * SZ_1M },
75};
76
77static struct mtd_partition partition_info128k[] = {
78	{ .name		= "AUTCPU12 flash partition 1",
79	  .offset	= 0,
80	  .size		= 16 * SZ_1M },
81	{ .name		= "AUTCPU12 flash partition 2",
82	  .offset	= 16 * SZ_1M,
83	  .size		= 112 * SZ_1M },
84};
85
86#define NUM_PARTITIONS16K 2
87#define NUM_PARTITIONS32K 2
88#define NUM_PARTITIONS64K 2
89#define NUM_PARTITIONS128K 2
90/*
91 *	hardware specific access to control-lines
92 *
93 *	ALE bit 4 autcpu12_pedr
94 *	CLE bit 5 autcpu12_pedr
95 *	NCE bit 0 fio_ctrl
96 *
97 */
98static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd,
99			       unsigned int ctrl)
100{
101	struct nand_chip *chip = mtd->priv;
102
103	if (ctrl & NAND_CTRL_CHANGE) {
104		void __iomem *addr;
105		unsigned char bits;
106
107		addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
108		bits = (ctrl & NAND_CLE) << 4;
109		bits |= (ctrl & NAND_ALE) << 2;
110		writeb((readb(addr) & ~0x30) | bits, addr);
111
112		addr = autcpu12_fio_base + AUTCPU12_SMC_SELECT_OFFSET;
113		writeb((readb(addr) & ~0x1) | (ctrl & NAND_NCE), addr);
114	}
115
116	if (cmd != NAND_CMD_NONE)
117		writeb(cmd, chip->IO_ADDR_W);
118}
119
120/*
121 *	read device ready pin
122 */
123int autcpu12_device_ready(struct mtd_info *mtd)
124{
125	void __iomem *addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
126
127	return readb(addr) & AUTCPU12_SMC_RDY;
128}
129
130/*
131 * Main initialization routine
132 */
133static int __init autcpu12_init(void)
134{
135	struct nand_chip *this;
136	int err = 0;
137
138	/* Allocate memory for MTD device structure and private data */
139	autcpu12_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
140			       GFP_KERNEL);
141	if (!autcpu12_mtd) {
142		printk("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
143		err = -ENOMEM;
144		goto out;
145	}
146
147	/* map physical adress */
148	autcpu12_fio_base = ioremap(AUTCPU12_PHYS_SMC, SZ_1K);
149	if (!autcpu12_fio_base) {
150		printk("Ioremap autcpu12 SmartMedia Card failed\n");
151		err = -EIO;
152		goto out_mtd;
153	}
154
155	/* Get pointer to private data */
156	this = (struct nand_chip *)(&autcpu12_mtd[1]);
157
158	/* Initialize structures */
159	memset(autcpu12_mtd, 0, sizeof(struct mtd_info));
160	memset(this, 0, sizeof(struct nand_chip));
161
162	/* Link the private data with the MTD structure */
163	autcpu12_mtd->priv = this;
164	autcpu12_mtd->owner = THIS_MODULE;
165
166	/* Set address of NAND IO lines */
167	this->IO_ADDR_R = autcpu12_fio_base;
168	this->IO_ADDR_W = autcpu12_fio_base;
169	this->cmd_ctrl = autcpu12_hwcontrol;
170	this->dev_ready = autcpu12_device_ready;
171	/* 20 us command delay time */
172	this->chip_delay = 20;
173	this->ecc.mode = NAND_ECC_SOFT;
174
175	/* Enable the following for a flash based bad block table */
176	/*
177	   this->options = NAND_USE_FLASH_BBT;
178	 */
179	this->options = NAND_USE_FLASH_BBT;
180
181	/* Scan to find existance of the device */
182	if (nand_scan(autcpu12_mtd, 1)) {
183		err = -ENXIO;
184		goto out_ior;
185	}
186
187	/* Register the partitions */
188	switch (autcpu12_mtd->size) {
189		case SZ_16M:
190			add_mtd_partitions(autcpu12_mtd, partition_info16k,
191					   NUM_PARTITIONS16K);
192			break;
193		case SZ_32M:
194			add_mtd_partitions(autcpu12_mtd, partition_info32k,
195					   NUM_PARTITIONS32K);
196			break;
197		case SZ_64M:
198			add_mtd_partitions(autcpu12_mtd, partition_info64k,
199					   NUM_PARTITIONS64K);
200			break;
201		case SZ_128M:
202			add_mtd_partitions(autcpu12_mtd, partition_info128k,
203					   NUM_PARTITIONS128K);
204			break;
205		default:
206			printk("Unsupported SmartMedia device\n");
207			err = -ENXIO;
208			goto out_ior;
209	}
210	goto out;
211
212 out_ior:
213	iounmap(autcpu12_fio_base);
214 out_mtd:
215	kfree(autcpu12_mtd);
216 out:
217	return err;
218}
219
220module_init(autcpu12_init);
221
222/*
223 * Clean up routine
224 */
225static void __exit autcpu12_cleanup(void)
226{
227	/* Release resources, unregister device */
228	nand_release(autcpu12_mtd);
229
230	/* unmap physical adress */
231	iounmap(autcpu12_fio_base);
232
233	/* Free the MTD device structure */
234	kfree(autcpu12_mtd);
235}
236
237module_exit(autcpu12_cleanup);
238
239MODULE_LICENSE("GPL");
240MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
241MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");
242