文件系统转换 Bootloader之uBoot简介（转）(28)

63 break;

64 }

65 }

66

67 /* S3C2410：查询NAND Flash状态

68 *

69 * 返回值：0 – 忙, 1 – 就绪

70 */

71 static int s3c2410_nand_devready(struct mtd_info *mtd)

72 {

73 S3C2410_NAND * const s3c2410nand = S3C2410_GetBase_NAND();

74

75 return (s3c2410nand->NFSTAT & S3C2410_NFSTAT_READY);

76 }

77

78

79 /* S3C2440：NAND Flash的片选函数 */

80 static void s3c2440_nand_select_chip(struct mtd_info *mtd, int chip)

81 {

82 S3C2440_NAND * const s3c2440nand = S3C2440_GetBase_NAND();

83

84 if (chip == -1) {

85 s3c2440nand->NFCONT |= S3C2440_NFCONT_nFCE;/* 禁止片选信号 */

86 } else {

87 s3c2440nand->NFCONT &= ~S3C2440_NFCONT_nFCE;/* 使能片选信号 */

88 }

89 }

90

91 /* S3C2440：命令和控制函数，与s3c2410_nand_hwcontrol函数类似 */

92 static void s3c2440_nand_hwcontrol(struct mtd_info *mtd, int cmd)

93 {

94 S3C2440_NAND * const s3c2440nand = S3C2440_GetBase_NAND();

95 struct nand_chip *chip = mtd->priv;

96

97 switch (cmd) {

98 case NAND_CTL_SETNCE:

99 case NAND_CTL_CLRNCE:

100 printf("%s: called for NCE\n", __FUNCTION__);

101 break;

102

103 case NAND_CTL_SETCLE:

104 chip->IO_ADDR_W = (void *)&s3c2440nand->NFCMD;

105 break;

106

107 case NAND_CTL_SETALE:

108 chip->IO_ADDR_W = (void *)&s3c2440nand->NFADDR;

109 break;

110

111 /* NAND_CTL_CLRCLE: */

112 /* NAND_CTL_CLRALE: */

113 default:

114 chip->IO_ADDR_W = (void *)&s3c2440nand->NFDATA;

115 break;

116 }

117 }

118

119 /* S3C2440：查询NAND Flash状态

120 *

121 * 返回值：0 – 忙, 1 – 就绪

122 */

123 static int s3c2440_nand_devready(struct mtd_info *mtd)

本文来自电脑杂谈，转载请注明本文网址：
http://www.pc-fly.com/a/jisuanjixue/article-66092-28.html