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);
24 (void)in_be32(upm->mxmr);
27 static void fsl_upm_end_pattern(struct fsl_upm *upm)
29 clrbits_be32(upm->mxmr, MxMR_OP_RUNP);
31 while (in_be32(upm->mxmr) & MxMR_OP_RUNP)
35 static void fsl_upm_run_pattern(struct fsl_upm *upm, int width,
36 void __iomem *io_addr, u32 mar)
38 out_be32(upm->mar, mar);
39 (void)in_be32(upm->mar);
45 out_be16(io_addr, 0x0);
48 out_be32(io_addr, 0x0);
53 static void fun_wait(struct fsl_upm_nand *fun)
56 while (!fun->dev_ready(fun->chip_nr))
57 debug("unexpected busy state\n");
60 * If the R/B pin is not connected,
61 * a short delay is necessary.
67 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
68 static void fun_select_chip(struct mtd_info *mtd, int chip_nr)
70 struct nand_chip *chip = mtd->priv;
71 struct fsl_upm_nand *fun = chip->priv;
74 fun->chip_nr = chip_nr;
75 chip->IO_ADDR_R = chip->IO_ADDR_W =
76 fun->upm.io_addr + fun->chip_offset * chip_nr;
77 } else if (chip_nr == -1) {
78 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
83 static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
85 struct nand_chip *chip = mtd->priv;
86 struct fsl_upm_nand *fun = chip->priv;
87 void __iomem *io_addr;
90 if (!(ctrl & fun->last_ctrl)) {
91 fsl_upm_end_pattern(&fun->upm);
93 if (cmd == NAND_CMD_NONE)
96 fun->last_ctrl = ctrl & (NAND_ALE | NAND_CLE);
99 if (ctrl & NAND_CTRL_CHANGE) {
101 fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
102 else if (ctrl & NAND_CLE)
103 fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
106 mar = cmd << (32 - fun->width);
107 io_addr = fun->upm.io_addr;
108 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
109 if (fun->chip_nr > 0) {
110 io_addr += fun->chip_offset * fun->chip_nr;
111 if (fun->upm_mar_chip_offset)
112 mar |= fun->upm_mar_chip_offset * fun->chip_nr;
115 fsl_upm_run_pattern(&fun->upm, fun->width, io_addr, mar);
118 * Some boards/chips needs this. At least the MPC8360E-RDK
119 * needs it. Probably weird chip, because I don't see any
120 * need for this on MPC8555E + Samsung K9F1G08U0A. Usually
121 * here are 0-2 unexpected busy states per block read.
123 if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN)
127 static u8 upm_nand_read_byte(struct mtd_info *mtd)
129 struct nand_chip *chip = mtd->priv;
131 return in_8(chip->IO_ADDR_R);
134 static void upm_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
137 struct nand_chip *chip = mtd->priv;
138 struct fsl_upm_nand *fun = chip->priv;
140 for (i = 0; i < len; i++) {
141 out_8(chip->IO_ADDR_W, buf[i]);
142 if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE)
146 if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER)
150 static void upm_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
153 struct nand_chip *chip = mtd->priv;
155 for (i = 0; i < len; i++)
156 buf[i] = in_8(chip->IO_ADDR_R);
159 static int upm_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
162 struct nand_chip *chip = mtd->priv;
164 for (i = 0; i < len; i++) {
165 if (buf[i] != in_8(chip->IO_ADDR_R))
172 static int nand_dev_ready(struct mtd_info *mtd)
174 struct nand_chip *chip = mtd->priv;
175 struct fsl_upm_nand *fun = chip->priv;
177 return fun->dev_ready(fun->chip_nr);
180 int fsl_upm_nand_init(struct nand_chip *chip, struct fsl_upm_nand *fun)
182 if (fun->width != 8 && fun->width != 16 && fun->width != 32)
185 fun->last_ctrl = NAND_CLE;
188 chip->chip_delay = fun->chip_delay;
189 chip->ecc.mode = NAND_ECC_SOFT;
190 chip->cmd_ctrl = fun_cmd_ctrl;
191 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
192 chip->select_chip = fun_select_chip;
194 chip->read_byte = upm_nand_read_byte;
195 chip->read_buf = upm_nand_read_buf;
196 chip->write_buf = upm_nand_write_buf;
197 chip->verify_buf = upm_nand_verify_buf;
199 chip->dev_ready = nand_dev_ready;