1 /* -*- linux-c -*- */
2 /*
3 * Copyright (C) 2001 By Joachim Martillo, Telford Tools, Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 *
10 */
11 /* This file is linked in, but I am
12 not sure there is ever any
13 reason directly to read the
14 serial eprom on the multichannel
15 server host card. */
16
17 /* We handle PCI devices */
18 #include <linux/pci.h>
19
20 /* We need to use ioremap */
21 #include <asm/io.h>
22
23 #include <linux/delay.h>
24
25 #include "8253xmcs.h"
26 #include "8253xctl.h"
27
28 /* read a byte out of the serial eeprom/nvram by means of
29 * 16 short commands */
30
amcc_nvram_breadw(unsigned char * bridge_space,unsigned short address,unsigned char * value)31 static unsigned int amcc_nvram_breadw(unsigned char *bridge_space,
32 unsigned short address,
33 unsigned char *value)
34 {
35 unsigned int count;
36 unsigned rhr;
37
38 for(count = 0; count < 20000; ++count)
39 {
40 rhr = readl(bridge_space + AMCC_RCR);
41 if((rhr & AMCC_NVRBUSY) == 0)
42 {
43 break;
44 }
45 udelay(1);
46 }
47 if(count >= 20000)
48 {
49 return FALSE;
50 }
51 rhr = AMCC_NVRWRLA | ((address & 0x00FF) << 16);
52 writel(rhr, bridge_space + AMCC_RCR);
53 rhr = AMCC_NVRWRHA | ((address & 0xFF00) << 8);
54 writel(rhr, bridge_space + AMCC_RCR);
55 writel(AMCC_NVRRDDB, bridge_space + AMCC_RCR);
56 for(count = 0; count < 20000; ++count)
57 {
58 rhr = readl(bridge_space + AMCC_RCR);
59 if((rhr & AMCC_NVRBUSY) == 0)
60 {
61 break;
62 }
63 udelay(1);
64 }
65 if(count >= 20000)
66 {
67 return FALSE;
68 }
69 if(rhr & AMCC_NVRACCFAIL)
70 {
71 return FALSE;
72 }
73 *value = (unsigned char) (rhr >> 16);
74 return TRUE;
75 }
76
77 /* read the whole serial eeprom from the host card */
78
amcc_read_nvram(unsigned char * buffer,unsigned length,unsigned char * bridge_space)79 unsigned int amcc_read_nvram(unsigned char* buffer, unsigned length, unsigned char *bridge_space)
80 {
81 unsigned int count;
82 length <<= 1; /* covert words to bytes */
83
84 for(count = 0; count < length; ++count)
85 {
86 if(amcc_nvram_breadw(bridge_space, count, &buffer[count]) == FALSE)
87 {
88 return FALSE;
89 }
90 }
91 return TRUE;
92 }
93