+++ /dev/null
-/*
- * (C) Copyright 2000
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Marius Groeger <mgroeger@sysgo.de>
- *
- * Code in faintly related to linux/arch/powerpc/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).
- *
- * -----------------------------------------------------------------
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-#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 *)(CONFIG_SYS_IMMR + 0x2000 + CONFIG_SYS_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 *)CONFIG_SYS_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 *)CONFIG_SYS_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;
-}
projects / karo-tx-uboot.git / blobdiff