306b97cc712f6688f7eebbb91243a9d91efa2ba5
[openwrt/svn-archive/archive.git] / target / linux / adm5120-2.6 / files / drivers / mtd / nand / rbmipsnand.c
1 /*==============================================================================*/
2 /* rbmipsnand.c */
3 /* This module is derived from the 2.4 driver shipped by Microtik for their */
4 /* Routerboard 1xx and 5xx series boards. It provides support for the built in */
5 /* NAND flash on the Routerboard 1xx series boards for Linux 2.6.19+. */
6 /* Licence: Original Microtik code seems not to have a licence. */
7 /* Rewritten code all GPL V2. */
8 /* Copyright(C) 2007 david.goodenough@linkchoose.co.uk (for rewriten code) */
9 /*==============================================================================*/
10
11 #include <linux/init.h>
12 #include <linux/mtd/nand.h>
13 #include <linux/mtd/mtd.h>
14 #include <linux/mtd/partitions.h>
15 #include <linux/delay.h>
16 #include <asm/io.h>
17 #include <asm/irq.h>
18 #include <asm/bootinfo.h>
19
20 #define SMEM1_BASE 0x10000000 // from ADM5120 documentation
21 #define SMEM1(x) (*((volatile unsigned char *) (KSEG1ADDR(SMEM1_BASE) + x)))
22
23 #define NAND_RW_REG 0x0 //data register
24 #define NAND_SET_CEn 0x1 //CE# low
25 #define NAND_CLR_CEn 0x2 //CE# high
26 #define NAND_CLR_CLE 0x3 //CLE low
27 #define NAND_SET_CLE 0x4 //CLE high
28 #define NAND_CLR_ALE 0x5 //ALE low
29 #define NAND_SET_ALE 0x6 //ALE high
30 #define NAND_SET_SPn 0x7 //SP# low (use spare area)
31 #define NAND_CLR_SPn 0x8 //SP# high (do not use spare area)
32 #define NAND_SET_WPn 0x9 //WP# low
33 #define NAND_CLR_WPn 0xA //WP# high
34 #define NAND_STS_REG 0xB //Status register
35
36 #define MEM32(x) *((volatile unsigned *) (x))
37 static void __iomem *p_nand;
38
39 static int rb100_dev_ready(struct mtd_info *mtd) {
40 return SMEM1(NAND_STS_REG) & 0x80;
41 }
42
43 static void rbmips_hwcontrol100(struct mtd_info *mtd, int cmd, unsigned int ctrl) {
44 struct nand_chip *chip = mtd->priv;
45 if (ctrl & NAND_CTRL_CHANGE) {
46 SMEM1((( ctrl & NAND_CLE) ? NAND_SET_CLE : NAND_CLR_CLE)) = 0x01;
47 SMEM1((( ctrl & NAND_ALE) ? NAND_SET_ALE : NAND_CLR_ALE)) = 0x01;
48 SMEM1((( ctrl & NAND_NCE) ? NAND_SET_CEn : NAND_CLR_CEn)) = 0x01;
49 }
50 if( cmd != NAND_CMD_NONE)
51 writeb( cmd, chip->IO_ADDR_W);
52 }
53
54 static struct mtd_partition partition_info[] = {
55 {
56 name: "RouterBoard NAND Boot",
57 offset: 0,
58 size: 4 * 1024 * 1024
59 },
60 {
61 name: "rootfs",
62 offset: MTDPART_OFS_NXTBLK,
63 size: MTDPART_SIZ_FULL
64 }
65 };
66
67 static struct mtd_info rmtd;
68 static struct nand_chip rnand;
69 /*========================================================================*/
70 /* We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader */
71 /* will not be able to find the kernel that we load. So set the oobinfo */
72 /* when creating the partitions. */
73 /*========================================================================*/
74 static struct nand_ecclayout rb_ecclayout = {
75 .eccbytes = 6,
76 .eccpos = { 8, 9, 10, 13, 14, 15 },
77 .oobavail = 9,
78 .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1} }
79 };
80 static unsigned init_ok = 0;
81
82 unsigned get_rbnand_block_size(void) {
83 return init_ok ? rmtd.writesize : 0;
84 }
85
86 EXPORT_SYMBOL(get_rbnand_block_size);
87
88 int __init rbmips_init(void) {
89 memset(&rmtd, 0, sizeof(rmtd));
90 memset(&rnand, 0, sizeof(rnand));
91 printk(KERN_INFO "RB1xx nand\n");
92 MEM32(0xB2000064) = 0x100;
93 MEM32(0xB2000008) = 0x1;
94 SMEM1(NAND_SET_SPn) = 0x01;
95 SMEM1(NAND_CLR_WPn) = 0x01;
96 rnand.IO_ADDR_R = (unsigned char *)KSEG1ADDR(SMEM1_BASE);
97 rnand.IO_ADDR_W = rnand.IO_ADDR_R;
98 rnand.cmd_ctrl = rbmips_hwcontrol100;
99 rnand.dev_ready = rb100_dev_ready;
100 p_nand = (void __iomem *)ioremap(( unsigned long)SMEM1_BASE, 0x1000);
101 if (!p_nand) {
102 printk(KERN_WARNING "RB1xx nand Unable ioremap buffer\n");
103 return -ENXIO;
104 }
105 rnand.ecc.mode = NAND_ECC_SOFT;
106 rnand.ecc.layout = &rb_ecclayout;
107 rnand.chip_delay = 25;
108 rnand.options |= NAND_NO_AUTOINCR;
109 rmtd.priv = &rnand;
110 if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)
111 && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)) {
112 printk(KERN_INFO "RB1xxx nand device not found\n");
113 iounmap ((void *)p_nand);
114 return -ENXIO;
115 }
116 add_mtd_partitions(&rmtd, partition_info, 2);
117 init_ok = 1;
118 return 0;
119 }
120
121 module_init(rbmips_init);
122