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[] = {
54 .offset = MTDPART_OFS_APPEND,
55 .size = MTDPART_SIZ_FULL
60 * au_read_byte - read one byte from the chip
61 * @mtd: MTD device structure
63 * read function for 8bit buswith
65 static u_char au_read_byte(struct mtd_info *mtd)
67 struct nand_chip *this = mtd->priv;
68 u_char ret = readb(this->IO_ADDR_R);
74 * au_write_byte - write one byte to the chip
75 * @mtd: MTD device structure
76 * @byte: pointer to data byte to write
78 * write function for 8it buswith
80 static void au_write_byte(struct mtd_info *mtd, u_char byte)
82 struct nand_chip *this = mtd->priv;
83 writeb(byte, this->IO_ADDR_W);
88 * au_read_byte16 - read one byte endianess aware from the chip
89 * @mtd: MTD device structure
91 * read function for 16bit buswith with
92 * endianess conversion
94 static u_char au_read_byte16(struct mtd_info *mtd)
96 struct nand_chip *this = mtd->priv;
97 u_char ret = (u_char) cpu_to_le16(readw(this->IO_ADDR_R));
103 * au_write_byte16 - write one byte endianess aware to the chip
104 * @mtd: MTD device structure
105 * @byte: pointer to data byte to write
107 * write function for 16bit buswith with
108 * endianess conversion
110 static void au_write_byte16(struct mtd_info *mtd, u_char byte)
112 struct nand_chip *this = mtd->priv;
113 writew(le16_to_cpu((u16) byte), this->IO_ADDR_W);
118 * au_read_word - read one word from the chip
119 * @mtd: MTD device structure
121 * read function for 16bit buswith without
122 * endianess conversion
124 static u16 au_read_word(struct mtd_info *mtd)
126 struct nand_chip *this = mtd->priv;
127 u16 ret = readw(this->IO_ADDR_R);
133 * au_write_word - write one word to the chip
134 * @mtd: MTD device structure
135 * @word: data word to write
137 * write function for 16bit buswith without
138 * endianess conversion
140 static void au_write_word(struct mtd_info *mtd, u16 word)
142 struct nand_chip *this = mtd->priv;
143 writew(word, this->IO_ADDR_W);
148 * au_write_buf - write buffer to chip
149 * @mtd: MTD device structure
151 * @len: number of bytes to write
153 * write function for 8bit buswith
155 static void au_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
158 struct nand_chip *this = mtd->priv;
160 for (i=0; i<len; i++) {
161 writeb(buf[i], this->IO_ADDR_W);
167 * au_read_buf - read chip data into buffer
168 * @mtd: MTD device structure
169 * @buf: buffer to store date
170 * @len: number of bytes to read
172 * read function for 8bit buswith
174 static void au_read_buf(struct mtd_info *mtd, u_char *buf, int len)
177 struct nand_chip *this = mtd->priv;
179 for (i=0; i<len; i++) {
180 buf[i] = readb(this->IO_ADDR_R);
186 * au_verify_buf - Verify chip data against buffer
187 * @mtd: MTD device structure
188 * @buf: buffer containing the data to compare
189 * @len: number of bytes to compare
191 * verify function for 8bit buswith
193 static int au_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
196 struct nand_chip *this = mtd->priv;
198 for (i=0; i<len; i++) {
199 if (buf[i] != readb(this->IO_ADDR_R))
208 * au_write_buf16 - write buffer to chip
209 * @mtd: MTD device structure
211 * @len: number of bytes to write
213 * write function for 16bit buswith
215 static void au_write_buf16(struct mtd_info *mtd, const u_char *buf, int len)
218 struct nand_chip *this = mtd->priv;
219 u16 *p = (u16 *) buf;
222 for (i=0; i<len; i++) {
223 writew(p[i], this->IO_ADDR_W);
230 * au_read_buf16 - read chip data into buffer
231 * @mtd: MTD device structure
232 * @buf: buffer to store date
233 * @len: number of bytes to read
235 * read function for 16bit buswith
237 static void au_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
240 struct nand_chip *this = mtd->priv;
241 u16 *p = (u16 *) buf;
244 for (i=0; i<len; i++) {
245 p[i] = readw(this->IO_ADDR_R);
251 * au_verify_buf16 - Verify chip data against buffer
252 * @mtd: MTD device structure
253 * @buf: buffer containing the data to compare
254 * @len: number of bytes to compare
256 * verify function for 16bit buswith
258 static int au_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len)
261 struct nand_chip *this = mtd->priv;
262 u16 *p = (u16 *) buf;
265 for (i=0; i<len; i++) {
266 if (p[i] != readw(this->IO_ADDR_R))
274 static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
276 register struct nand_chip *this = mtd->priv;
280 case NAND_CTL_SETCLE: this->IO_ADDR_W = p_nand + MEM_STNAND_CMD; break;
281 case NAND_CTL_CLRCLE: this->IO_ADDR_W = p_nand + MEM_STNAND_DATA; break;
283 case NAND_CTL_SETALE: this->IO_ADDR_W = p_nand + MEM_STNAND_ADDR; break;
284 case NAND_CTL_CLRALE:
285 this->IO_ADDR_W = p_nand + MEM_STNAND_DATA;
286 /* FIXME: Nobody knows why this is neccecary,
287 * but it works only that way */
291 case NAND_CTL_SETNCE:
292 /* assert (force assert) chip enable */
293 au_writel((1<<(4+NAND_CS)) , MEM_STNDCTL); break;
296 case NAND_CTL_CLRNCE:
297 /* deassert chip enable */
298 au_writel(0, MEM_STNDCTL); break;
302 this->IO_ADDR_R = this->IO_ADDR_W;
304 /* Drain the writebuffer */
308 int au1550_device_ready(struct mtd_info *mtd)
310 int ret = (au_readl(MEM_STSTAT) & 0x1) ? 1 : 0;
316 * Main initialization routine
318 int __init au1xxx_nand_init (void)
320 struct nand_chip *this;
321 u16 boot_swapboot = 0; /* default value */
326 /* Allocate memory for MTD device structure and private data */
327 au1550_mtd = kmalloc (sizeof(struct mtd_info) +
328 sizeof (struct nand_chip), GFP_KERNEL);
330 printk ("Unable to allocate NAND MTD dev structure.\n");
334 /* Get pointer to private data */
335 this = (struct nand_chip *) (&au1550_mtd[1]);
337 /* Initialize structures */
338 memset((char *) au1550_mtd, 0, sizeof(struct mtd_info));
339 memset((char *) this, 0, sizeof(struct nand_chip));
341 /* Link the private data with the MTD structure */
342 au1550_mtd->priv = this;
345 /* disable interrupts */
346 au_writel(au_readl(MEM_STNDCTL) & ~(1<<8), MEM_STNDCTL);
348 /* disable NAND boot */
349 au_writel(au_readl(MEM_STNDCTL) & ~(1<<0), MEM_STNDCTL);
351 #ifdef CONFIG_MIPS_PB1550
352 /* set gpio206 high */
353 au_writel(au_readl(GPIO2_DIR) & ~(1<<6), GPIO2_DIR);
355 boot_swapboot = (au_readl(MEM_STSTAT) & (0x7<<1)) |
356 ((bcsr->status >> 6) & 0x1);
357 switch (boot_swapboot) {
375 printk("Pb1550 NAND: bad boot:swap\n");
381 /* Configure chip-select; normally done by boot code, e.g. YAMON */
384 au_writel(NAND_STCFG, MEM_STCFG0);
385 au_writel(NAND_STTIME, MEM_STTIME0);
386 au_writel(NAND_STADDR, MEM_STADDR0);
389 au_writel(NAND_STCFG, MEM_STCFG1);
390 au_writel(NAND_STTIME, MEM_STTIME1);
391 au_writel(NAND_STADDR, MEM_STADDR1);
394 au_writel(NAND_STCFG, MEM_STCFG2);
395 au_writel(NAND_STTIME, MEM_STTIME2);
396 au_writel(NAND_STADDR, MEM_STADDR2);
399 au_writel(NAND_STCFG, MEM_STCFG3);
400 au_writel(NAND_STTIME, MEM_STTIME3);
401 au_writel(NAND_STADDR, MEM_STADDR3);
405 /* Locate NAND chip-select in order to determine NAND phys address */
406 mem_staddr = 0x00000000;
407 if (((au_readl(MEM_STCFG0) & 0x7) == 0x5) && (NAND_CS == 0))
408 mem_staddr = au_readl(MEM_STADDR0);
409 else if (((au_readl(MEM_STCFG1) & 0x7) == 0x5) && (NAND_CS == 1))
410 mem_staddr = au_readl(MEM_STADDR1);
411 else if (((au_readl(MEM_STCFG2) & 0x7) == 0x5) && (NAND_CS == 2))
412 mem_staddr = au_readl(MEM_STADDR2);
413 else if (((au_readl(MEM_STCFG3) & 0x7) == 0x5) && (NAND_CS == 3))
414 mem_staddr = au_readl(MEM_STADDR3);
416 if (mem_staddr == 0x00000000) {
417 printk("Au1xxx NAND: ERROR WITH NAND CHIP-SELECT\n");
421 nand_phys = (mem_staddr << 4) & 0xFFFC0000;
423 p_nand = (void __iomem *)ioremap(nand_phys, 0x1000);
425 /* make controller and MTD agree */
427 nand_width = au_readl(MEM_STCFG0) & (1<<22);
429 nand_width = au_readl(MEM_STCFG1) & (1<<22);
431 nand_width = au_readl(MEM_STCFG2) & (1<<22);
433 nand_width = au_readl(MEM_STCFG3) & (1<<22);
436 /* Set address of hardware control function */
437 this->hwcontrol = au1550_hwcontrol;
438 this->dev_ready = au1550_device_ready;
439 /* 30 us command delay time */
440 this->chip_delay = 30;
441 this->eccmode = NAND_ECC_SOFT;
443 this->options = NAND_NO_AUTOINCR;
446 this->options |= NAND_BUSWIDTH_16;
448 this->read_byte = (!nand_width) ? au_read_byte16 : au_read_byte;
449 this->write_byte = (!nand_width) ? au_write_byte16 : au_write_byte;
450 this->write_word = au_write_word;
451 this->read_word = au_read_word;
452 this->write_buf = (!nand_width) ? au_write_buf16 : au_write_buf;
453 this->read_buf = (!nand_width) ? au_read_buf16 : au_read_buf;
454 this->verify_buf = (!nand_width) ? au_verify_buf16 : au_verify_buf;
456 /* Scan to find existence of the device */
457 if (nand_scan (au1550_mtd, 1)) {
462 /* Register the partitions */
463 add_mtd_partitions(au1550_mtd, partition_info, ARRAY_SIZE(partition_info));
468 iounmap ((void *)p_nand);
475 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);
494 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");