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-rw-r--r--board/mbx8xx/vpd.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/board/mbx8xx/vpd.c b/board/mbx8xx/vpd.c
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+/*
+ * (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;
+}
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