2 * drivers/mtd/nand/au1550nd.c
4 * Copyright (C) 2004 Embedded Edge, LLC
6 * $Id: au1550nd.c,v 1.13 2005/11/07 11:14:30 gleixner Exp $
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/mtd/mtd.h>
18 #include <linux/mtd/nand.h>
19 #include <linux/mtd/partitions.h>
20 #include <linux/version.h>
23 /* fixme: this is ugly */
24 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 0)
25 #include <asm/mach-au1x00/au1xxx.h>
27 #include <asm/au1000.h>
28 #ifdef CONFIG_MIPS_PB1550
29 #include <asm/pb1550.h>
31 #ifdef CONFIG_MIPS_DB1550
32 #include <asm/db1x00.h>
37 * MTD structure for NAND controller
39 static struct mtd_info *au1550_mtd = NULL;
40 static void __iomem *p_nand;
41 static int nand_width = 1; /* default x8 */
44 * Define partitions for flash device
46 static const struct mtd_partition partition_info[] = {
50 .size = 8 * 1024 * 1024},
53 .offset = MTDPART_OFS_APPEND,
54 .size = MTDPART_SIZ_FULL}
58 * au_read_byte - read one byte from the chip
59 * @mtd: MTD device structure
61 * read function for 8bit buswith
63 static u_char au_read_byte(struct mtd_info *mtd)
65 struct nand_chip *this = mtd->priv;
66 u_char ret = readb(this->IO_ADDR_R);
72 * au_write_byte - write one byte to the chip
73 * @mtd: MTD device structure
74 * @byte: pointer to data byte to write
76 * write function for 8it buswith
78 static void au_write_byte(struct mtd_info *mtd, u_char byte)
80 struct nand_chip *this = mtd->priv;
81 writeb(byte, this->IO_ADDR_W);
86 * au_read_byte16 - read one byte endianess aware from the chip
87 * @mtd: MTD device structure
89 * read function for 16bit buswith with
90 * endianess conversion
92 static u_char au_read_byte16(struct mtd_info *mtd)
94 struct nand_chip *this = mtd->priv;
95 u_char ret = (u_char) cpu_to_le16(readw(this->IO_ADDR_R));
101 * au_write_byte16 - write one byte endianess aware to the chip
102 * @mtd: MTD device structure
103 * @byte: pointer to data byte to write
105 * write function for 16bit buswith with
106 * endianess conversion
108 static void au_write_byte16(struct mtd_info *mtd, u_char byte)
110 struct nand_chip *this = mtd->priv;
111 writew(le16_to_cpu((u16) byte), this->IO_ADDR_W);
116 * au_read_word - read one word from the chip
117 * @mtd: MTD device structure
119 * read function for 16bit buswith without
120 * endianess conversion
122 static u16 au_read_word(struct mtd_info *mtd)
124 struct nand_chip *this = mtd->priv;
125 u16 ret = readw(this->IO_ADDR_R);
131 * au_write_word - write one word to the chip
132 * @mtd: MTD device structure
133 * @word: data word to write
135 * write function for 16bit buswith without
136 * endianess conversion
138 static void au_write_word(struct mtd_info *mtd, u16 word)
140 struct nand_chip *this = mtd->priv;
141 writew(word, this->IO_ADDR_W);
146 * au_write_buf - write buffer to chip
147 * @mtd: MTD device structure
149 * @len: number of bytes to write
151 * write function for 8bit buswith
153 static void au_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
156 struct nand_chip *this = mtd->priv;
158 for (i = 0; i < len; i++) {
159 writeb(buf[i], this->IO_ADDR_W);
165 * au_read_buf - read chip data into buffer
166 * @mtd: MTD device structure
167 * @buf: buffer to store date
168 * @len: number of bytes to read
170 * read function for 8bit buswith
172 static void au_read_buf(struct mtd_info *mtd, u_char *buf, int len)
175 struct nand_chip *this = mtd->priv;
177 for (i = 0; i < len; i++) {
178 buf[i] = readb(this->IO_ADDR_R);
184 * au_verify_buf - Verify chip data against buffer
185 * @mtd: MTD device structure
186 * @buf: buffer containing the data to compare
187 * @len: number of bytes to compare
189 * verify function for 8bit buswith
191 static int au_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
194 struct nand_chip *this = mtd->priv;
196 for (i = 0; i < len; i++) {
197 if (buf[i] != readb(this->IO_ADDR_R))
206 * au_write_buf16 - write buffer to chip
207 * @mtd: MTD device structure
209 * @len: number of bytes to write
211 * write function for 16bit buswith
213 static void au_write_buf16(struct mtd_info *mtd, const u_char *buf, int len)
216 struct nand_chip *this = mtd->priv;
217 u16 *p = (u16 *) buf;
220 for (i = 0; i < len; i++) {
221 writew(p[i], this->IO_ADDR_W);
228 * au_read_buf16 - read chip data into buffer
229 * @mtd: MTD device structure
230 * @buf: buffer to store date
231 * @len: number of bytes to read
233 * read function for 16bit buswith
235 static void au_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
238 struct nand_chip *this = mtd->priv;
239 u16 *p = (u16 *) buf;
242 for (i = 0; i < len; i++) {
243 p[i] = readw(this->IO_ADDR_R);
249 * au_verify_buf16 - Verify chip data against buffer
250 * @mtd: MTD device structure
251 * @buf: buffer containing the data to compare
252 * @len: number of bytes to compare
254 * verify function for 16bit buswith
256 static int au_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len)
259 struct nand_chip *this = mtd->priv;
260 u16 *p = (u16 *) buf;
263 for (i = 0; i < len; i++) {
264 if (p[i] != readw(this->IO_ADDR_R))
272 static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
274 register struct nand_chip *this = mtd->priv;
278 case NAND_CTL_SETCLE:
279 this->IO_ADDR_W = p_nand + MEM_STNAND_CMD;
282 case NAND_CTL_CLRCLE:
283 this->IO_ADDR_W = p_nand + MEM_STNAND_DATA;
286 case NAND_CTL_SETALE:
287 this->IO_ADDR_W = p_nand + MEM_STNAND_ADDR;
290 case NAND_CTL_CLRALE:
291 this->IO_ADDR_W = p_nand + MEM_STNAND_DATA;
292 /* FIXME: Nobody knows why this is necessary,
293 * but it works only that way */
297 case NAND_CTL_SETNCE:
298 /* assert (force assert) chip enable */
299 au_writel((1 << (4 + NAND_CS)), MEM_STNDCTL);
302 case NAND_CTL_CLRNCE:
303 /* deassert chip enable */
304 au_writel(0, MEM_STNDCTL);
308 this->IO_ADDR_R = this->IO_ADDR_W;
310 /* Drain the writebuffer */
314 int au1550_device_ready(struct mtd_info *mtd)
316 int ret = (au_readl(MEM_STSTAT) & 0x1) ? 1 : 0;
322 * Main initialization routine
324 static int __init au1xxx_nand_init(void)
326 struct nand_chip *this;
327 u16 boot_swapboot = 0; /* default value */
332 /* Allocate memory for MTD device structure and private data */
333 au1550_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
335 printk("Unable to allocate NAND MTD dev structure.\n");
339 /* Get pointer to private data */
340 this = (struct nand_chip *)(&au1550_mtd[1]);
342 /* Initialize structures */
343 memset(au1550_mtd, 0, sizeof(struct mtd_info));
344 memset(this, 0, sizeof(struct nand_chip));
346 /* Link the private data with the MTD structure */
347 au1550_mtd->priv = this;
348 au1550_mtd->owner = THIS_MODULE;
351 /* MEM_STNDCTL: disable ints, disable nand boot */
352 au_writel(0, MEM_STNDCTL);
354 #ifdef CONFIG_MIPS_PB1550
355 /* set gpio206 high */
356 au_writel(au_readl(GPIO2_DIR) & ~(1 << 6), GPIO2_DIR);
358 boot_swapboot = (au_readl(MEM_STSTAT) & (0x7 << 1)) | ((bcsr->status >> 6) & 0x1);
359 switch (boot_swapboot) {
377 printk("Pb1550 NAND: bad boot:swap\n");
383 /* Configure chip-select; normally done by boot code, e.g. YAMON */
386 au_writel(NAND_STCFG, MEM_STCFG0);
387 au_writel(NAND_STTIME, MEM_STTIME0);
388 au_writel(NAND_STADDR, MEM_STADDR0);
391 au_writel(NAND_STCFG, MEM_STCFG1);
392 au_writel(NAND_STTIME, MEM_STTIME1);
393 au_writel(NAND_STADDR, MEM_STADDR1);
396 au_writel(NAND_STCFG, MEM_STCFG2);
397 au_writel(NAND_STTIME, MEM_STTIME2);
398 au_writel(NAND_STADDR, MEM_STADDR2);
401 au_writel(NAND_STCFG, MEM_STCFG3);
402 au_writel(NAND_STTIME, MEM_STTIME3);
403 au_writel(NAND_STADDR, MEM_STADDR3);
407 /* Locate NAND chip-select in order to determine NAND phys address */
408 mem_staddr = 0x00000000;
409 if (((au_readl(MEM_STCFG0) & 0x7) == 0x5) && (NAND_CS == 0))
410 mem_staddr = au_readl(MEM_STADDR0);
411 else if (((au_readl(MEM_STCFG1) & 0x7) == 0x5) && (NAND_CS == 1))
412 mem_staddr = au_readl(MEM_STADDR1);
413 else if (((au_readl(MEM_STCFG2) & 0x7) == 0x5) && (NAND_CS == 2))
414 mem_staddr = au_readl(MEM_STADDR2);
415 else if (((au_readl(MEM_STCFG3) & 0x7) == 0x5) && (NAND_CS == 3))
416 mem_staddr = au_readl(MEM_STADDR3);
418 if (mem_staddr == 0x00000000) {
419 printk("Au1xxx NAND: ERROR WITH NAND CHIP-SELECT\n");
423 nand_phys = (mem_staddr << 4) & 0xFFFC0000;
425 p_nand = (void __iomem *)ioremap(nand_phys, 0x1000);
427 /* make controller and MTD agree */
429 nand_width = au_readl(MEM_STCFG0) & (1 << 22);
431 nand_width = au_readl(MEM_STCFG1) & (1 << 22);
433 nand_width = au_readl(MEM_STCFG2) & (1 << 22);
435 nand_width = au_readl(MEM_STCFG3) & (1 << 22);
437 /* Set address of hardware control function */
438 this->hwcontrol = au1550_hwcontrol;
439 this->dev_ready = au1550_device_ready;
440 /* 30 us command delay time */
441 this->chip_delay = 30;
442 this->eccmode = NAND_ECC_SOFT;
444 this->options = NAND_NO_AUTOINCR;
447 this->options |= NAND_BUSWIDTH_16;
449 this->read_byte = (!nand_width) ? au_read_byte16 : au_read_byte;
450 this->write_byte = (!nand_width) ? au_write_byte16 : au_write_byte;
451 this->write_word = au_write_word;
452 this->read_word = au_read_word;
453 this->write_buf = (!nand_width) ? au_write_buf16 : au_write_buf;
454 this->read_buf = (!nand_width) ? au_read_buf16 : au_read_buf;
455 this->verify_buf = (!nand_width) ? au_verify_buf16 : au_verify_buf;
457 /* Scan to find existence of the device */
458 if (nand_scan(au1550_mtd, 1)) {
463 /* Register the partitions */
464 add_mtd_partitions(au1550_mtd, partition_info, ARRAY_SIZE(partition_info));
469 iounmap((void *)p_nand);
476 module_init(au1xxx_nand_init);
481 static void __exit au1550_cleanup(void)
483 struct nand_chip *this = (struct nand_chip *)&au1550_mtd[1];
485 /* Release resources, unregister device */
486 nand_release(au1550_mtd);
488 /* Free the MTD device structure */
492 iounmap((void *)p_nand);
495 module_exit(au1550_cleanup);
497 MODULE_LICENSE("GPL");
498 MODULE_AUTHOR("Embedded Edge, LLC");
499 MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on Pb1550 board");