mtd: nand: omap_gpmc: support reading metadata from OOB

[karo-tx-uboot.git] / drivers / mtd / nand / fsl_upm.c

diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c
index e7e746b550d6a57c7dd9c34b76d0c643603d874f..65ce98ad5e332b8704344c990fa21e7da4d6827e 100644 (file)
--- a/drivers/mtd/nand/fsl_upm.c
+++ b/drivers/mtd/nand/fsl_upm.c
@@ -4,10 +4,7 @@
  * Copyright (C) 2007 MontaVista Software, Inc.
  *                    Anton Vorontsov <avorontsov@ru.mvista.com>
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
+ * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #include <config.h>
@@ -21,6 +18,7 @@
 static void fsl_upm_start_pattern(struct fsl_upm *upm, u32 pat_offset)
 {
        clrsetbits_be32(upm->mxmr, MxMR_MAD_MSK, MxMR_OP_RUNP | pat_offset);
+       (void)in_be32(upm->mxmr);
 }
 
 static void fsl_upm_end_pattern(struct fsl_upm *upm)
@@ -35,6 +33,7 @@ static void fsl_upm_run_pattern(struct fsl_upm *upm, int width,
                                void __iomem *io_addr, u32 mar)
 {
        out_be32(upm->mar, mar);
+       (void)in_be32(upm->mar);
        switch (width) {
        case 8:
                out_8(io_addr, 0x0);
@@ -48,6 +47,20 @@ static void fsl_upm_run_pattern(struct fsl_upm *upm, int width,
        }
 }
 
+static void fun_wait(struct fsl_upm_nand *fun)
+{
+       if (fun->dev_ready) {
+               while (!fun->dev_ready(fun->chip_nr))
+                       debug("unexpected busy state\n");
+       } else {
+               /*
+                * If the R/B pin is not connected,
+                * a short delay is necessary.
+                */
+               udelay(1);
+       }
+}
+
 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
 static void fun_select_chip(struct mtd_info *mtd, int chip_nr)
 {
@@ -99,34 +112,39 @@ static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
        fsl_upm_run_pattern(&fun->upm, fun->width, io_addr, mar);
 
        /*
-        * Some boards/chips needs this. At least on MPC8360E-RDK we
-        * need it. Probably weird chip, because I don't see any need
-        * for this on MPC8555E + Samsung K9F1G08U0A. Usually here are
-        * 0-2 unexpected busy states per block read.
+        * Some boards/chips needs this.  At least the MPC8360E-RDK
+        * needs it.  Probably weird chip, because I don't see any
+        * need for this on MPC8555E + Samsung K9F1G08U0A.  Usually
+        * here are 0-2 unexpected busy states per block read.
         */
-       if (fun->wait_pattern) {
-               while (!fun->dev_ready(fun->chip_nr))
-                       debug("unexpected busy state\n");
-       }
+       if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN)
+               fun_wait(fun);
 }
 
-static u8 nand_read_byte(struct mtd_info *mtd)
+static u8 upm_nand_read_byte(struct mtd_info *mtd)
 {
        struct nand_chip *chip = mtd->priv;
 
        return in_8(chip->IO_ADDR_R);
 }
 
-static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
+static void upm_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 {
        int i;
        struct nand_chip *chip = mtd->priv;
+       struct fsl_upm_nand *fun = chip->priv;
 
-       for (i = 0; i < len; i++)
+       for (i = 0; i < len; i++) {
                out_8(chip->IO_ADDR_W, buf[i]);
+               if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE)
+                       fun_wait(fun);
+       }
+
+       if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER)
+               fun_wait(fun);
 }
 
-static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+static void upm_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 {
        int i;
        struct nand_chip *chip = mtd->priv;
@@ -135,7 +153,8 @@ static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
                buf[i] = in_8(chip->IO_ADDR_R);
 }
 
-static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
+#if defined(CONFIG_MTD_NAND_VERIFY_WRITE)
+static int upm_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
 {
        int i;
        struct nand_chip *chip = mtd->priv;
@@ -147,6 +166,7 @@ static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
 
        return 0;
 }
+#endif
 
 static int nand_dev_ready(struct mtd_info *mtd)
 {
@@ -170,10 +190,12 @@ int fsl_upm_nand_init(struct nand_chip *chip, struct fsl_upm_nand *fun)
 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
        chip->select_chip = fun_select_chip;
 #endif
-       chip->read_byte = nand_read_byte;
-       chip->read_buf = nand_read_buf;
-       chip->write_buf = nand_write_buf;
-       chip->verify_buf = nand_verify_buf;
+       chip->read_byte = upm_nand_read_byte;
+       chip->read_buf = upm_nand_read_buf;
+       chip->write_buf = upm_nand_write_buf;
+#if defined(CONFIG_MTD_NAND_VERIFY_WRITE)
+       chip->verify_buf = upm_nand_verify_buf;
+#endif
        if (fun->dev_ready)
                chip->dev_ready = nand_dev_ready;