summaryrefslogtreecommitdiffstats
path: root/board/mbx8xx/vpd.c
blob: 6f883520cde13bba9f3eaddb445c7769614eec5f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
/*
 * (C) Copyright 2000
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * Code in faintly related to linux/arch/ppc/8xx_io:
 * MPC8xx CPM I2C interface. Copyright (c) 1999 Dan Malek (dmalek@jlc.net).
 *
 * This file implements functions to read the MBX's Vital Product Data
 * (VPD). I can't use the more general i2c code in mpc8xx/... since I need
 * the VPD at a time where there is no RAM available yet. Hence the VPD is
 * read into a special area in the DPRAM (see config_MBX.h::CFG_DPRAMVPD).
 *
 * -----------------------------------------------------------------
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#ifdef CONFIG_8xx
#include <commproc.h>
#endif
#include "vpd.h"

/* Location of receive/transmit buffer descriptors
 * Allocate one transmit bd and one receive bd.
 * IIC_BD_FREE points to free bd space which we'll use as tx buffer.
 */
#define IIC_BD_TX1     (BD_IIC_START + 0*sizeof(cbd_t))
#define IIC_BD_TX2     (BD_IIC_START + 1*sizeof(cbd_t))
#define IIC_BD_RX      (BD_IIC_START + 2*sizeof(cbd_t))
#define IIC_BD_FREE    (BD_IIC_START + 3*sizeof(cbd_t))

/* FIXME -- replace 0x2000 with offsetof */
#define VPD_P ((vpd_t *)(CFG_IMMR + 0x2000 + CFG_DPRAMVPD))

/* transmit/receive buffers */
#define IIC_RX_LENGTH 128

#define WITH_MICROCODE_PATCH

vpd_packet_t * vpd_find_packet(u_char ident)
{
    vpd_packet_t *packet;
    vpd_t *vpd = VPD_P;

    packet = (vpd_packet_t *)&vpd->packets;
    while ((packet->identifier != ident) && packet->identifier != 0xFF)
    {
	packet = (vpd_packet_t *)((char *)packet + packet->size + 2);
    }
    return packet;
}

void vpd_init(void)
{
    volatile immap_t  *im = (immap_t *)CFG_IMMR;
    volatile cpm8xx_t *cp = &(im->im_cpm);
    volatile i2c8xx_t *i2c = (i2c8xx_t *)&(im->im_i2c);
    volatile iic_t *iip;
#ifdef WITH_MICROCODE_PATCH
    ulong reloc = 0;
#endif

    iip = (iic_t *)&cp->cp_dparam[PROFF_IIC];

    /*
     * kludge: when running from flash, no microcode patch can be
     * installed. However, the DPMEM usually contains non-zero
     * garbage at the relocatable patch base location, so lets clear
     * it now. This way the rest of the code can support the microcode
     * patch dynamically.
     */
    if ((ulong)vpd_init & 0xff000000)
      iip->iic_rpbase = 0;

#ifdef WITH_MICROCODE_PATCH
    /* Check for and use a microcode relocation patch. */
    if ((reloc = iip->iic_rpbase))
      iip = (iic_t *)&cp->cp_dpmem[iip->iic_rpbase];
#endif
    /* Initialize Port B IIC pins */
    cp->cp_pbpar |= 0x00000030;
    cp->cp_pbdir |= 0x00000030;
    cp->cp_pbodr |= 0x00000030;

    i2c->i2c_i2mod = 0x04;  /* filter clock */
    i2c->i2c_i2add = 0x34;	/* select an arbitrary (unique) address */
    i2c->i2c_i2brg = 0x07;  /* make clock run maximum slow	*/
    i2c->i2c_i2cmr = 0x00;  /* disable interrupts */
    i2c->i2c_i2cer = 0x1f;  /* clear events */
    i2c->i2c_i2com = 0x01;  /* configure i2c to work as master */

    if (vpd_read(0xa4, (uchar*)VPD_P, VPD_EEPROM_SIZE, 0) != VPD_EEPROM_SIZE)
    {
	hang();
    }
}


/* Read from I2C.
 * This is a two step process.  First, we send the "dummy" write
 * to set the device offset for the read.  Second, we perform
 * the read operation.
 */
int vpd_read(uint iic_device, uchar *buf, int count, int offset)
{
    volatile immap_t  *im = (immap_t *)CFG_IMMR;
    volatile cpm8xx_t *cp = &(im->im_cpm);
    volatile i2c8xx_t *i2c = (i2c8xx_t *)&(im->im_i2c);
    volatile iic_t *iip;
    volatile cbd_t *tbdf1, *tbdf2, *rbdf;
    uchar *tb;
    uchar event;
#ifdef WITH_MICROCODE_PATCH
    ulong reloc = 0;
#endif

    iip = (iic_t *)&cp->cp_dparam[PROFF_IIC];
#ifdef WITH_MICROCODE_PATCH
    /* Check for and use a microcode relocation patch. */
    if ((reloc = iip->iic_rpbase))
      iip = (iic_t *)&cp->cp_dpmem[iip->iic_rpbase];
#endif
    tbdf1 = (cbd_t *)&cp->cp_dpmem[IIC_BD_TX1];
    tbdf2 = (cbd_t *)&cp->cp_dpmem[IIC_BD_TX2];
    rbdf  = (cbd_t *)&cp->cp_dpmem[IIC_BD_RX];

    /* Send a "dummy write" operation.  This is a write request with
     * only the offset sent, followed by another start condition.
     * This will ensure we start reading from the first location
     * of the EEPROM.
     */
    tb = (uchar*)&cp->cp_dpmem[IIC_BD_FREE];
    tb[0] = iic_device & 0xfe;	/* device address */
    tb[1] = offset;	        /* offset */
    tbdf1->cbd_bufaddr = (uint)tb;
    tbdf1->cbd_datlen = 2;
    tbdf1->cbd_sc = 0x8400;

    tb += 2;
    tb[0] = iic_device | 1;	/* device address */
    tbdf2->cbd_bufaddr = (uint)tb;
    tbdf2->cbd_datlen = count+1;
    tbdf2->cbd_sc = 0xbc00;

    rbdf->cbd_bufaddr = (uint)buf;
    rbdf->cbd_datlen = 0;
    rbdf->cbd_sc = 0xb000;

    iip->iic_tbase = IIC_BD_TX1;
    iip->iic_tbptr = IIC_BD_TX1;
    iip->iic_rbase = IIC_BD_RX;
    iip->iic_rbptr = IIC_BD_RX;
    iip->iic_rfcr = 0x15;
    iip->iic_tfcr = 0x15;
    iip->iic_mrblr = count;
    iip->iic_rstate = 0;
    iip->iic_tstate = 0;

    i2c->i2c_i2cer = 0x1f;  /* clear event mask */
    i2c->i2c_i2mod |= 1;    /* enable iic operation */
    i2c->i2c_i2com |= 0x80;	/* start master */

    /* wait for IIC transfer */
    do {
	__asm__ volatile ("eieio");
	event = i2c->i2c_i2cer;
    } while (event == 0);

    if ((event & 0x10) || (event & 0x04)) {
	count = -1;
	goto bailout;
    }

bailout:
    i2c->i2c_i2mod &= ~1;   /* turn off iic operation */
    i2c->i2c_i2cer = 0x1f;  /* clear event mask */

    return count;
}