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annotate packages/devs/flash/powerpc/moab/current/src/moab_nand_flash.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents 7fbd87364c15
children
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1 //==========================================================================
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2 //
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3 // moab_nand_flash.c
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4 //
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5 // Flash programming for Toshiba NAND FLASH device on MOAB board
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): Gary Thomas <gary@mlbassoc.com>
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43 // Contributors:
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44 // Date: 2003-09-02
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45 // Purpose:
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46 // Description:
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //==========================================================================
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51
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52 #include <cyg/infra/cyg_type.h>
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53 #define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS
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54 #include <cyg/hal/ppc_regs.h> // Platform registers
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55 #include <cyg/hal/hal_io.h> // I/O macros
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56 #include <cyg/hal/hal_if.h> // Virtual vector interfaces
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57
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58 // There's a single TC58256 or TC58DVG02 on the MOAB board.
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59
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60 #define CYGHWR_DEVS_FLASH_TOSHIBA_TC58256
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61 #define CYGHWR_DEVS_FLASH_TOSHIBA_TC58DVG02
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62 #define CYGNUM_FLASH_BLANK (1)
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63 #define CYGNUM_FLASH_INTERLEAVE (1)
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64 #define CYGNUM_FLASH_WIDTH (8)
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65 #define CYGNUM_FLASH_SERIES (1)
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66 #define CYGNUM_FLASH_BASE (_MOAB_NAND)
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67
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68 #define CYGHWR_FLASH_TC58XXX_CE moab_CE
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69 #define CYGHWR_FLASH_TC58XXX_CLE moab_CLE
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70 #define CYGHWR_FLASH_TC58XXX_ALE moab_ALE
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71 #define CYGHWR_FLASH_TC58XXX_RDY moab_RDY
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72
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73 //
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74 // Select the NAND device - this will be held until the
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75 // entire command/data sequence has completed (which is
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76 // necessary for read sequential)
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77 //
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78 static void __inline__
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79 moab_CE(int state)
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80 {
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81 cyg_uint32 gpio_or;
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82 HAL_READ_UINT32(GPIO_OR, gpio_or);
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83 if (state) {
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84 // Assert CE
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85 gpio_or &= ~_MOAB_CE;
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86 } else {
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87 // De-assert CE
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88 gpio_or |= _MOAB_CE;
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89 }
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90 HAL_WRITE_UINT32(GPIO_OR, gpio_or);
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91 }
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92
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93 //
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94 // Prepare to send a command byte to the NAND interface
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95 //
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96 static void __inline__
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97 moab_CLE(int state)
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98 {
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99 cyg_uint32 gpio_or;
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100 HAL_READ_UINT32(GPIO_OR, gpio_or);
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101 if (state) {
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102 // Assert CLE
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103 gpio_or |= _MOAB_CLE;
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104 } else {
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105 // De-assert CLE
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106 gpio_or &= ~_MOAB_CLE;
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107 }
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108 HAL_WRITE_UINT32(GPIO_OR, gpio_or);
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109 }
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110
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111 //
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112 // Prepare to send address byte(s) to the NAND interface
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113 //
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114 static void __inline__
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115 moab_ALE(int state)
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116 {
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117 cyg_uint32 gpio_or;
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118
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119 HAL_READ_UINT32(GPIO_OR, gpio_or);
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120 if (state) {
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121 // Assert ALE
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122 gpio_or |= _MOAB_ALE;
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123 } else {
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124 // De-assert ALE
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125 gpio_or &= ~_MOAB_ALE;
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126 }
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127 HAL_WRITE_UINT32(GPIO_OR, gpio_or);
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128 }
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129
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130 //
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131 // Wait until the NAND device is ready (after a long operation)
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132 //
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133 static bool __inline__
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134 moab_RDY(void)
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135 {
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136 cyg_uint32 gpio_ir;
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137
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138 HAL_READ_UINT32(GPIO_IR, gpio_ir);
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139 return ((gpio_ir & _MOAB_RDY) != 0);
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140 }
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141
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142 #include <cyg/io/flash_tc58xxx.inl>
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143
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144
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145 // ------------------------------------------------------------------------
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146 // EOF moab_nand_flash.c