diff options
Diffstat (limited to 'u-boot/board/mbx8xx/vpd.c')
| -rw-r--r-- | u-boot/board/mbx8xx/vpd.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/u-boot/board/mbx8xx/vpd.c b/u-boot/board/mbx8xx/vpd.c new file mode 100644 index 0000000..1c99fd6 --- /dev/null +++ b/u-boot/board/mbx8xx/vpd.c @@ -0,0 +1,196 @@ +/* + * (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). + * + * ----------------------------------------------------------------- + * 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 *)(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; +} |