4 * Copyright (C) 2007 MontaVista Software, Inc.
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,
35 void __iomem *io_addr, u32 mar)
37 out_be32(upm->mar, mar);
43 out_be16(io_addr, 0x0);
46 out_be32(io_addr, 0x0);
51 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
52 static void fun_select_chip(struct mtd_info *mtd, int chip_nr)
54 struct nand_chip *chip = mtd->priv;
55 struct fsl_upm_nand *fun = chip->priv;
58 fun->chip_nr = chip_nr;
59 chip->IO_ADDR_R = chip->IO_ADDR_W =
60 fun->upm.io_addr + fun->chip_offset * chip_nr;
61 } else if (chip_nr == -1) {
62 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
67 static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
69 struct nand_chip *chip = mtd->priv;
70 struct fsl_upm_nand *fun = chip->priv;
71 void __iomem *io_addr;
74 if (!(ctrl & fun->last_ctrl)) {
75 fsl_upm_end_pattern(&fun->upm);
77 if (cmd == NAND_CMD_NONE)
80 fun->last_ctrl = ctrl & (NAND_ALE | NAND_CLE);
83 if (ctrl & NAND_CTRL_CHANGE) {
85 fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
86 else if (ctrl & NAND_CLE)
87 fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
90 mar = cmd << (32 - fun->width);
91 io_addr = fun->upm.io_addr;
92 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
93 if (fun->chip_nr > 0) {
94 io_addr += fun->chip_offset * fun->chip_nr;
95 if (fun->upm_mar_chip_offset)
96 mar |= fun->upm_mar_chip_offset * fun->chip_nr;
99 fsl_upm_run_pattern(&fun->upm, fun->width, io_addr, mar);
102 * Some boards/chips needs this. At least on MPC8360E-RDK we
103 * need it. Probably weird chip, because I don't see any need
104 * for this on MPC8555E + Samsung K9F1G08U0A. Usually here are
105 * 0-2 unexpected busy states per block read.
107 if (fun->wait_pattern) {
108 while (!fun->dev_ready(fun->chip_nr))
109 debug("unexpected busy state\n");
113 static u8 nand_read_byte(struct mtd_info *mtd)
115 struct nand_chip *chip = mtd->priv;
117 return in_8(chip->IO_ADDR_R);
120 static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
123 struct nand_chip *chip = mtd->priv;
125 for (i = 0; i < len; i++)
126 out_8(chip->IO_ADDR_W, buf[i]);
129 static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
132 struct nand_chip *chip = mtd->priv;
134 for (i = 0; i < len; i++)
135 buf[i] = in_8(chip->IO_ADDR_R);
138 static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
141 struct nand_chip *chip = mtd->priv;
143 for (i = 0; i < len; i++) {
144 if (buf[i] != in_8(chip->IO_ADDR_R))
151 static int nand_dev_ready(struct mtd_info *mtd)
153 struct nand_chip *chip = mtd->priv;
154 struct fsl_upm_nand *fun = chip->priv;
156 return fun->dev_ready(fun->chip_nr);
159 int fsl_upm_nand_init(struct nand_chip *chip, struct fsl_upm_nand *fun)
161 if (fun->width != 8 && fun->width != 16 && fun->width != 32)
164 fun->last_ctrl = NAND_CLE;
167 chip->chip_delay = fun->chip_delay;
168 chip->ecc.mode = NAND_ECC_SOFT;
169 chip->cmd_ctrl = fun_cmd_ctrl;
170 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
171 chip->select_chip = fun_select_chip;
173 chip->read_byte = nand_read_byte;
174 chip->read_buf = nand_read_buf;
175 chip->write_buf = nand_write_buf;
176 chip->verify_buf = nand_verify_buf;
178 chip->dev_ready = nand_dev_ready;