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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/mtd/nand/fsl_upm.c
4 * Copyright (C) 2007 MontaVista Software, Inc.
5 * Anton Vorontsov <avorontsov@ru.mvista.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
16 #include <asm/errno.h>
17 #include <linux/mtd/mtd.h>
18 #include <linux/mtd/fsl_upm.h>
21 static void fsl_upm_start_pattern(struct fsl_upm
*upm
, u32 pat_offset
)
23 clrsetbits_be32(upm
->mxmr
, MxMR_MAD_MSK
, MxMR_OP_RUNP
| pat_offset
);
26 static void fsl_upm_end_pattern(struct fsl_upm
*upm
)
28 clrbits_be32(upm
->mxmr
, MxMR_OP_RUNP
);
30 while (in_be32(upm
->mxmr
) & MxMR_OP_RUNP
)
34 static void fsl_upm_run_pattern(struct fsl_upm
*upm
, int width
, u32 cmd
)
36 out_be32(upm
->mar
, cmd
<< (32 - width
));
39 out_8(upm
->io_addr
, 0x0);
42 out_be16(upm
->io_addr
, 0x0);
45 out_be32(upm
->io_addr
, 0x0);
50 static void fun_cmd_ctrl(struct mtd_info
*mtd
, int cmd
, unsigned int ctrl
)
52 struct nand_chip
*chip
= mtd
->priv
;
53 struct fsl_upm_nand
*fun
= chip
->priv
;
55 if (!(ctrl
& fun
->last_ctrl
)) {
56 fsl_upm_end_pattern(&fun
->upm
);
58 if (cmd
== NAND_CMD_NONE
)
61 fun
->last_ctrl
= ctrl
& (NAND_ALE
| NAND_CLE
);
64 if (ctrl
& NAND_CTRL_CHANGE
) {
66 fsl_upm_start_pattern(&fun
->upm
, fun
->upm_addr_offset
);
67 else if (ctrl
& NAND_CLE
)
68 fsl_upm_start_pattern(&fun
->upm
, fun
->upm_cmd_offset
);
71 fsl_upm_run_pattern(&fun
->upm
, fun
->width
, cmd
);
74 * Some boards/chips needs this. At least on MPC8360E-RDK we
75 * need it. Probably weird chip, because I don't see any need
76 * for this on MPC8555E + Samsung K9F1G08U0A. Usually here are
77 * 0-2 unexpected busy states per block read.
79 if (fun
->wait_pattern
) {
80 while (!fun
->dev_ready())
81 debug("unexpected busy state\n");
85 static u8
nand_read_byte(struct mtd_info
*mtd
)
87 struct nand_chip
*chip
= mtd
->priv
;
89 return in_8(chip
->IO_ADDR_R
);
92 static void nand_write_buf(struct mtd_info
*mtd
, const u_char
*buf
, int len
)
95 struct nand_chip
*chip
= mtd
->priv
;
97 for (i
= 0; i
< len
; i
++)
98 out_8(chip
->IO_ADDR_W
, buf
[i
]);
101 static void nand_read_buf(struct mtd_info
*mtd
, u_char
*buf
, int len
)
104 struct nand_chip
*chip
= mtd
->priv
;
106 for (i
= 0; i
< len
; i
++)
107 buf
[i
] = in_8(chip
->IO_ADDR_R
);
110 static int nand_verify_buf(struct mtd_info
*mtd
, const u_char
*buf
, int len
)
113 struct nand_chip
*chip
= mtd
->priv
;
115 for (i
= 0; i
< len
; i
++) {
116 if (buf
[i
] != in_8(chip
->IO_ADDR_R
))
123 static int nand_dev_ready(struct mtd_info
*mtd
)
125 struct nand_chip
*chip
= mtd
->priv
;
126 struct fsl_upm_nand
*fun
= chip
->priv
;
128 return fun
->dev_ready();
131 int fsl_upm_nand_init(struct nand_chip
*chip
, struct fsl_upm_nand
*fun
)
133 if (fun
->width
!= 8 && fun
->width
!= 16 && fun
->width
!= 32)
136 fun
->last_ctrl
= NAND_CLE
;
139 chip
->chip_delay
= fun
->chip_delay
;
140 chip
->ecc
.mode
= NAND_ECC_SOFT
;
141 chip
->cmd_ctrl
= fun_cmd_ctrl
;
142 chip
->read_byte
= nand_read_byte
;
143 chip
->read_buf
= nand_read_buf
;
144 chip
->write_buf
= nand_write_buf
;
145 chip
->verify_buf
= nand_verify_buf
;
147 chip
->dev_ready
= nand_dev_ready
;