drivers/mtd/nand/fsl_upm.c

   1 /*
   2  * FSL UPM NAND driver
   3  *
   4  * Copyright (C) 2007 MontaVista Software, Inc.
   5  *                    Anton Vorontsov <[email protected]>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <config.h>
  11 #include <common.h>
  12 #include <asm/io.h>
  13 #include <linux/errno.h>
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/mtd/fsl_upm.h>
  16 #include <nand.h>
  17
  18 static void fsl_upm_start_pattern(struct fsl_upm *upm, u32 pat_offset)
  19 {
  20         clrsetbits_be32(upm->mxmr, MxMR_MAD_MSK, MxMR_OP_RUNP | pat_offset);
  21         (void)in_be32(upm->mxmr);
  22 }
  23
  24 static void fsl_upm_end_pattern(struct fsl_upm *upm)
  25 {
  26         clrbits_be32(upm->mxmr, MxMR_OP_RUNP);
  27
  28         while (in_be32(upm->mxmr) & MxMR_OP_RUNP)
  29                 eieio();
  30 }
  31
  32 static void fsl_upm_run_pattern(struct fsl_upm *upm, int width,
  33                                 void __iomem *io_addr, u32 mar)
  34 {
  35         out_be32(upm->mar, mar);
  36         (void)in_be32(upm->mar);
  37         switch (width) {
  38         case 8:
  39                 out_8(io_addr, 0x0);
  40                 break;
  41         case 16:
  42                 out_be16(io_addr, 0x0);
  43                 break;
  44         case 32:
  45                 out_be32(io_addr, 0x0);
  46                 break;
  47         }
  48 }
  49
  50 static void fun_wait(struct fsl_upm_nand *fun)
  51 {
  52         if (fun->dev_ready) {
  53                 while (!fun->dev_ready(fun->chip_nr))
  54                         debug("unexpected busy state\n");
  55         } else {
  56                 /*
  57                  * If the R/B pin is not connected,
  58                  * a short delay is necessary.
  59                  */
  60                 udelay(1);
  61         }
  62 }
  63
  64 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
  65 static void fun_select_chip(struct mtd_info *mtd, int chip_nr)
  66 {
  67         struct nand_chip *chip = mtd_to_nand(mtd);
  68         struct fsl_upm_nand *fun = nand_get_controller_data(chip);
  69
  70         if (chip_nr >= 0) {
  71                 fun->chip_nr = chip_nr;
  72                 chip->IO_ADDR_R = chip->IO_ADDR_W =
  73                         fun->upm.io_addr + fun->chip_offset * chip_nr;
  74         } else if (chip_nr == -1) {
  75                 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
  76         }
  77 }
  78 #endif
  79
  80 static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  81 {
  82         struct nand_chip *chip = mtd_to_nand(mtd);
  83         struct fsl_upm_nand *fun = nand_get_controller_data(chip);
  84         void __iomem *io_addr;
  85         u32 mar;
  86
  87         if (!(ctrl & fun->last_ctrl)) {
  88                 fsl_upm_end_pattern(&fun->upm);
  89
  90                 if (cmd == NAND_CMD_NONE)
  91                         return;
  92
  93                 fun->last_ctrl = ctrl & (NAND_ALE | NAND_CLE);
  94         }
  95
  96         if (ctrl & NAND_CTRL_CHANGE) {
  97                 if (ctrl & NAND_ALE)
  98                         fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
  99                 else if (ctrl & NAND_CLE)
 100                         fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
 101         }
 102
 103         mar = cmd << (32 - fun->width);
 104         io_addr = fun->upm.io_addr;
 105 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
 106         if (fun->chip_nr > 0) {
 107                 io_addr += fun->chip_offset * fun->chip_nr;
 108                 if (fun->upm_mar_chip_offset)
 109                         mar |= fun->upm_mar_chip_offset * fun->chip_nr;
 110         }
 111 #endif
 112         fsl_upm_run_pattern(&fun->upm, fun->width, io_addr, mar);
 113
 114         /*
 115          * Some boards/chips needs this.  At least the MPC8360E-RDK
 116          * needs it.  Probably weird chip, because I don't see any
 117          * need for this on MPC8555E + Samsung K9F1G08U0A.  Usually
 118          * here are 0-2 unexpected busy states per block read.
 119          */
 120         if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN)
 121                 fun_wait(fun);
 122 }
 123
 124 static u8 upm_nand_read_byte(struct mtd_info *mtd)
 125 {
 126         struct nand_chip *chip = mtd_to_nand(mtd);
 127
 128         return in_8(chip->IO_ADDR_R);
 129 }
 130
 131 static void upm_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 132 {
 133         int i;
 134         struct nand_chip *chip = mtd_to_nand(mtd);
 135         struct fsl_upm_nand *fun = nand_get_controller_data(chip);
 136
 137         for (i = 0; i < len; i++) {
 138                 out_8(chip->IO_ADDR_W, buf[i]);
 139                 if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE)
 140                         fun_wait(fun);
 141         }
 142
 143         if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER)
 144                 fun_wait(fun);
 145 }
 146
 147 static void upm_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 148 {
 149         int i;
 150         struct nand_chip *chip = mtd_to_nand(mtd);
 151
 152         for (i = 0; i < len; i++)
 153                 buf[i] = in_8(chip->IO_ADDR_R);
 154 }
 155
 156 static int nand_dev_ready(struct mtd_info *mtd)
 157 {
 158         struct nand_chip *chip = mtd_to_nand(mtd);
 159         struct fsl_upm_nand *fun = nand_get_controller_data(chip);
 160
 161         return fun->dev_ready(fun->chip_nr);
 162 }
 163
 164 int fsl_upm_nand_init(struct nand_chip *chip, struct fsl_upm_nand *fun)
 165 {
 166         if (fun->width != 8 && fun->width != 16 && fun->width != 32)
 167                 return -ENOSYS;
 168
 169         fun->last_ctrl = NAND_CLE;
 170
 171         nand_set_controller_data(chip, fun);
 172         chip->chip_delay = fun->chip_delay;
 173         chip->ecc.mode = NAND_ECC_SOFT;
 174         chip->cmd_ctrl = fun_cmd_ctrl;
 175 #if CONFIG_SYS_NAND_MAX_CHIPS > 1
 176         chip->select_chip = fun_select_chip;
 177 #endif
 178         chip->read_byte = upm_nand_read_byte;
 179         chip->read_buf = upm_nand_read_buf;
 180         chip->write_buf = upm_nand_write_buf;
 181         if (fun->dev_ready)
 182                 chip->dev_ready = nand_dev_ready;
 183
 184         return 0;
 185 }