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git.ipfire.org Git - thirdparty/u-boot.git/blob - examples/standalone/eepro100_eeprom.c
2 * Copyright 1998-2001 by Donald Becker.
3 * This software may be used and distributed according to the terms of
4 * the GNU General Public License (GPL), incorporated herein by reference.
5 * Contact the author for use under other terms.
7 * This program must be compiled with "-O"!
8 * See the bottom of this file for the suggested compile-command.
10 * The author may be reached as becker@scyld.com, or C/O
11 * Scyld Computing Corporation
12 * 410 Severn Ave., Suite 210
15 * Common-sense licensing statement: Using any portion of this program in
16 * your own program means that you must give credit to the original author
17 * and release the resulting code under the GPL.
20 /* avoid unnecessary memcpy function */
21 #define __HAVE_ARCH_MEMCPY
22 #define _PPC_STRING_H_
27 static int reset_eeprom(unsigned long ioaddr
, unsigned char *hwaddr
);
29 int eepro100_eeprom(int argc
, char *argv
[])
33 unsigned char hwaddr1
[6] = { 0x00, 0x00, 0x02, 0x03, 0x04, 0x05 };
34 unsigned char hwaddr2
[6] = { 0x00, 0x00, 0x02, 0x03, 0x04, 0x06 };
38 #if defined(CONFIG_OXC)
39 ret
|= reset_eeprom(0x80000000, hwaddr1
);
40 ret
|= reset_eeprom(0x81000000, hwaddr2
);
46 /* Default EEPROM for i82559 */
47 static unsigned short default_eeprom
[64] = {
48 0x0100, 0x0302, 0x0504, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
49 0xffff, 0xffff, 0x40c0, 0x0000, 0x0000, 0xffff, 0xffff, 0xffff,
50 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
51 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
52 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
53 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
54 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
55 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff
58 static unsigned short eeprom
[256];
60 static int eeprom_size
= 64;
61 static int eeprom_addr_size
= 6;
65 static inline unsigned short swap16(unsigned short x
)
67 return (((x
& 0xff) << 8) | ((x
& 0xff00) >> 8));
70 static inline void outw(short data
, long addr
)
72 *(volatile short *)(addr
) = swap16(data
);
75 static inline short inw(long addr
)
77 return swap16(*(volatile short *)(addr
));
80 static inline void *memcpy(void *dst
, const void *src
, unsigned int len
)
84 *ret
++ = *((char *)src
);
90 /* The EEPROM commands include the alway-set leading bit. */
91 #define EE_WRITE_CMD (5)
92 #define EE_READ_CMD (6)
93 #define EE_ERASE_CMD (7)
95 /* Serial EEPROM section. */
96 #define EE_SHIFT_CLK 0x01 /* EEPROM shift clock. */
97 #define EE_CS 0x02 /* EEPROM chip select. */
98 #define EE_DATA_WRITE 0x04 /* EEPROM chip data in. */
99 #define EE_DATA_READ 0x08 /* EEPROM chip data out. */
100 #define EE_ENB (0x4800 | EE_CS)
101 #define EE_WRITE_0 0x4802
102 #define EE_WRITE_1 0x4806
105 /* Delay between EEPROM clock transitions. */
106 #define eeprom_delay(ee_addr) inw(ee_addr)
108 /* Wait for the EEPROM to finish the previous operation. */
109 static int eeprom_busy_poll(long ee_ioaddr
)
112 outw(EE_ENB
, ee_ioaddr
);
113 for (i
= 0; i
< 10000; i
++) /* Typical 2000 ticks */
114 if (inw(ee_ioaddr
) & EE_DATA_READ
)
119 /* This executes a generic EEPROM command, typically a write or write enable.
120 It returns the data output from the EEPROM, and thus may also be used for
122 static int do_eeprom_cmd(long ioaddr
, int cmd
, int cmd_len
)
125 long ee_addr
= ioaddr
+ EE_OFFSET
;
128 printf(" EEPROM op 0x%x: ", cmd
);
130 outw(EE_ENB
| EE_SHIFT_CLK
, ee_addr
);
132 /* Shift the command bits out. */
134 short dataval
= (cmd
& (1 << cmd_len
)) ? EE_WRITE_1
: EE_WRITE_0
;
135 outw(dataval
, ee_addr
);
136 eeprom_delay(ee_addr
);
138 printf("%X", inw(ee_addr
) & 15);
139 outw(dataval
| EE_SHIFT_CLK
, ee_addr
);
140 eeprom_delay(ee_addr
);
141 retval
= (retval
<< 1) | ((inw(ee_addr
) & EE_DATA_READ
) ? 1 : 0);
142 } while (--cmd_len
>= 0);
144 outw(EE_ENB
, ee_addr
);
146 /* Terminate the EEPROM access. */
147 outw(EE_ENB
& ~EE_CS
, ee_addr
);
149 printf(" EEPROM result is 0x%5.5x.\n", retval
);
153 static int read_eeprom(long ioaddr
, int location
, int addr_len
)
155 return do_eeprom_cmd(ioaddr
, ((EE_READ_CMD
<< addr_len
) | location
)
156 << 16 , 3 + addr_len
+ 16) & 0xffff;
159 static void write_eeprom(long ioaddr
, int index
, int value
, int addr_len
)
161 long ee_ioaddr
= ioaddr
+ EE_OFFSET
;
164 /* Poll for previous op finished. */
165 eeprom_busy_poll(ee_ioaddr
); /* Typical 0 ticks */
166 /* Enable programming modes. */
167 do_eeprom_cmd(ioaddr
, (0x4f << (addr_len
-4)), 3 + addr_len
);
168 /* Do the actual write. */
169 do_eeprom_cmd(ioaddr
,
170 (((EE_WRITE_CMD
<<addr_len
) | index
)<<16) | (value
& 0xffff),
172 /* Poll for write finished. */
173 i
= eeprom_busy_poll(ee_ioaddr
); /* Typical 2000 ticks */
175 printf(" Write finished after %d ticks.\n", i
);
176 /* Disable programming. This command is not instantaneous, so we check
177 for busy before the next op. */
178 do_eeprom_cmd(ioaddr
, (0x40 << (addr_len
-4)), 3 + addr_len
);
179 eeprom_busy_poll(ee_ioaddr
);
182 static int reset_eeprom(unsigned long ioaddr
, unsigned char *hwaddr
)
184 unsigned short checksum
= 0;
188 printf("Resetting i82559 EEPROM @ 0x%08lX ... ", ioaddr
);
190 size_test
= do_eeprom_cmd(ioaddr
, (EE_READ_CMD
<< 8) << 16, 27);
191 eeprom_addr_size
= (size_test
& 0xffe0000) == 0xffe0000 ? 8 : 6;
192 eeprom_size
= 1 << eeprom_addr_size
;
194 memcpy(eeprom
, default_eeprom
, sizeof default_eeprom
);
196 for (i
= 0; i
< 3; i
++)
197 eeprom
[i
] = (hwaddr
[i
*2+1]<<8) + hwaddr
[i
*2];
199 /* Recalculate the checksum. */
200 for (i
= 0; i
< eeprom_size
- 1; i
++)
201 checksum
+= eeprom
[i
];
202 eeprom
[i
] = 0xBABA - checksum
;
204 for (i
= 0; i
< eeprom_size
; i
++)
205 write_eeprom(ioaddr
, i
, eeprom
[i
], eeprom_addr_size
);
207 for (i
= 0; i
< eeprom_size
; i
++)
208 if (read_eeprom(ioaddr
, i
, eeprom_addr_size
) != eeprom
[i
]) {