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nuclear@78
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1 #include <stdio.h>
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nuclear@78
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2 #include <stdlib.h>
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nuclear@78
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3 #include <string.h>
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nuclear@83
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4 #include <ctype.h>
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nuclear@78
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5 #include <inttypes.h>
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6 #include <assert.h>
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nuclear@78
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7 #include "ata.h"
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8 #include "intr.h"
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9 #include "asmops.h"
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10
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11 /* registers */
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12 #define REG_DATA 0 /* R/W */
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13 #define REG_ERROR 1 /* R */
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14 #define REG_FEATURES 1 /* W */
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15 #define REG_COUNT 2 /* R/W */
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16 #define REG_LBA0 3 /* R/W */
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17 #define REG_LBA1 4 /* R/W */
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18 #define REG_LBA2 5 /* R/W */
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19 #define REG_DEVICE 6 /* R/W */
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20 #define REG_CMD 7 /* W */
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21 #define REG_STATUS 7 /* R */
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22
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23 #define REG_CTL 518
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24 #define REG_ALTSTAT 518
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25
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26 /* status bit fields */
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27 #define ST_ERR (1 << 0)
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28 #define ST_DRQ (1 << 3)
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29 #define ST_DRDY (1 << 6)
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30 #define ST_BSY (1 << 7)
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31
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32 /* device select bit in control register */
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33 #define DEV_SEL(x) (((x) & 1) << 4)
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34
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35 /* ATA commands */
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36 #define CMD_IDENTIFY 0xec
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37
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38
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39 struct device {
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40 int id; /* id of the device on its ATA interface (0 master, 1 slave) */
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41 int iface; /* ATA interface for this device (0 or 1) */
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42 int port_base; /* interface I/O port base */
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43
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44 uint32_t nsect_lba;
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45 uint64_t nsect_lba48;
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46 };
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47
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48
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49 static int identify(struct device *dev, int iface, int id);
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50 static void select_dev(struct device *dev);
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51 static int wait_busy(struct device *dev);
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52 static int wait_drq(struct device *dev);
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53 static void read_data(struct device *dev, void *buf);
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54 static inline uint8_t read_reg8(struct device *dev, int reg);
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55 static inline uint16_t read_reg16(struct device *dev, int reg);
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56 static inline void write_reg8(struct device *dev, int reg, uint8_t val);
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57 static inline void write_reg16(struct device *dev, int reg, uint16_t val);
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58 static void ata_intr(int inum);
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59 static void *atastr(void *res, void *src, int n);
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60 static char *size_str(uint64_t nsect, char *buf);
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61
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62 /* last drive selected on each bus */
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63 static int drvsel[2] = {-1, -1};
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64
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65 /* 4 possible devices: 2 ATA interfaces with 2 devices each.
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66 * this will never change unless we start querying the PCI config space
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67 * for additional drives (in which case this whole init code must be
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68 * rewritten anyway), but I like it spelt out like this.
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69 */
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70 #define MAX_IFACES 2
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71 #define MAX_DEV (MAX_IFACES * 2)
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72 static struct device dev[MAX_DEV];
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73
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74
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75 void init_ata(void)
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76 {
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77 int i;
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78
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79 interrupt(IRQ_TO_INTR(15), ata_intr);
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80
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81 for(i=0; i<MAX_DEV; i++) {
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82 int iface = i / MAX_IFACES;
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83 int id = i % MAX_IFACES;
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84
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85 if(identify(dev + i, iface, id) == -1) {
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86 dev[i].id = -1;
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87 }
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88 }
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89 }
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90
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91 static int identify(struct device *dev, int iface, int id)
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92 {
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93 /* base address of the two ATA interfaces */
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94 static const int port_base[] = {0x1f0, 0x170};
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95 unsigned char st;
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96 uint16_t *info;
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97 char textbuf[42]; /* at most we need 40 chars for ident strings */
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98
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99 dev->id = id;
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100 dev->iface = iface;
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101 dev->port_base = port_base[iface];
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102
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103 /* a status of 0xff means there's no drive on the interface */
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104 if((st = read_reg8(dev, REG_ALTSTAT)) == 0xff) {
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105 return -1;
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106 }
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107
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108 select_dev(dev);
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109 /* wait a bit to allow the device time to respond */
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110 iodelay(); iodelay(); iodelay(); iodelay();
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111
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112 write_reg8(dev, REG_CMD, CMD_IDENTIFY);
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113
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114 if(!(st = read_reg8(dev, REG_ALTSTAT)) || (st & ST_ERR)) {
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115 /* does not exist */
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116 return -1;
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117 }
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118 if(wait_busy(dev) == -1) {
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119 /* got ST_ERR, not ATA */
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120 return -1;
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121 }
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122
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123 info = malloc(512);
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124 assert(info);
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125
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126 /* read the device information */
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127 read_data(dev, info);
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128
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129 /* print model and serial */
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130 printf("ata%d: %s", (dev->iface << 1) | dev->id, atastr(textbuf, info + 27, 40));
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131 printf(" [s/n: %s]", atastr(textbuf, info + 10, 20));
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132
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133 dev->nsect_lba = *(uint32_t*)(info + 60);
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134 dev->nsect_lba48 = *(uint64_t*)(info + 100) & 0xffffffffffffull;
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135
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136 if(!dev->nsect_lba) {
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137 printf(" drive does not support LBA, ignoring!\n");
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138 free(info);
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139 return -1;
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140 }
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141
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142 if(dev->nsect_lba48) {
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143 size_str(dev->nsect_lba48, textbuf);
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144 } else {
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145 size_str(dev->nsect_lba, textbuf);
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146 }
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147 printf(" size: %s\n", textbuf);
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148
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149 free(info);
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150 return 0;
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151 }
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152
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153 static void select_dev(struct device *dev)
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154 {
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155 /* if this is the currently selected device, thy work is done */
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156 if(drvsel[dev->iface] == dev->id)
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157 return;
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158
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159 /* wait for BSY and DRQ to clear */
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160 while(read_reg8(dev, REG_ALTSTAT) & (ST_BSY | ST_DRQ));
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161
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162 /* set the correct device bit to the device register */
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163 write_reg8(dev, REG_DEVICE, DEV_SEL(dev->id));
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164 }
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165
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166 static int wait_busy(struct device *dev)
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167 {
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168 unsigned char st;
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169
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170 do {
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171 st = read_reg8(dev, REG_ALTSTAT);
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172 } while((st & ST_BSY) && !(st & ST_ERR));
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173
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174 return st & ST_ERR ? -1 : 0;
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175 }
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176
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177 static int wait_drq(struct device *dev)
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178 {
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179 unsigned char st;
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180
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181 do {
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182 st = read_reg8(dev, REG_ALTSTAT);
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183 } while(!(st & (ST_DRQ | ST_ERR)));
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184
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185 return st & ST_ERR ? -1 : 0;
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186 }
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187
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188 static void read_data(struct device *dev, void *buf)
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189 {
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190 int i;
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191 uint16_t *ptr = buf;
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192
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193 /* wait for the data request from the drive */
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194 wait_drq(dev);
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195
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196 /* ready to transfer */
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197 for(i=0; i<256; i++) {
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198 *ptr++ = read_reg16(dev, REG_DATA);
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199 }
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200 }
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201
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202 static inline uint8_t read_reg8(struct device *dev, int reg)
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203 {
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204 uint8_t val;
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205 inb(val, dev->port_base + reg);
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206 return val;
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207 }
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208
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209 static inline uint16_t read_reg16(struct device *dev, int reg)
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210 {
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211 uint16_t val;
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212 inw(val, dev->port_base + reg);
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213 return val;
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214 }
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215
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216 static inline void write_reg8(struct device *dev, int reg, uint8_t val)
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217 {
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218 outb(val, dev->port_base + reg);
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219 }
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220
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221 static inline void write_reg16(struct device *dev, int reg, uint16_t val)
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222 {
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223 outw(val, dev->port_base + reg);
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224 }
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225
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226 static void ata_intr(int inum)
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227 {
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228 printf("ATA interrupt\n");
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229 }
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230
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231 static void *atastr(void *res, void *src, int n)
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232 {
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233 int i;
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234 uint16_t *sptr = (uint16_t*)src;
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235 char *dptr = res;
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236
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237 for(i=0; i<n/2; i++) {
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238 *dptr++ = (*sptr & 0xff00) >> 8;
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239 *dptr++ = *sptr++ & 0xff;
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240 }
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241
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242 while(isspace(*--dptr));
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243 *++dptr = 0;
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244 return res;
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245 }
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246
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247 static char *size_str(uint64_t nsect, char *buf)
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248 {
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249 static const char *suffix[] = {"kb", "mb", "gb", "tb", "pb", 0};
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250 int i;
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251 unsigned int rem;
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252
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253 /* start with kilobytes */
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254 nsect /= 2;
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255
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256 for(i=0; nsect >= 1024 && suffix[i + 1]; i++) {
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257 rem = nsect % 1024;
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258 nsect /= 1024;
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259 }
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260 sprintf(buf, "%u.%u%s", (unsigned int)nsect, 100 * rem / 1024, suffix[i]);
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261 return buf;
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262 }
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263
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