diff options
author | Stefan Roese <sr@denx.de> | 2005-08-15 12:31:23 +0200 |
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committer | Stefan Roese <sr@denx.de> | 2005-08-15 12:31:23 +0200 |
commit | b79316f2a263f424e2a94abaa2c3f639fad7a864 (patch) | |
tree | 4d0db640a8221bffc6415c55a67f34561c97e693 /board/sandburst/common/ppc440gx_i2c.c | |
parent | 2893ecbf3e5b983970138289b759baf45a327ff3 (diff) |
Add Sandburst Metrobox and Sandburst Karef board support packages.
Second serial port on 440GX now defined as a system device.
Add 'Short Etch' code for Cicada PHY within 440gx_enet.c
Patch by Travis B. Sawyer, 12 Jul 2005
Check return value of malloc in 440gx_enet.c
Patch by Travis B. Sawyer, 18 Jul 2005
Diffstat (limited to 'board/sandburst/common/ppc440gx_i2c.c')
-rw-r--r-- | board/sandburst/common/ppc440gx_i2c.c | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/board/sandburst/common/ppc440gx_i2c.c b/board/sandburst/common/ppc440gx_i2c.c new file mode 100644 index 00000000000..c3b267c4942 --- /dev/null +++ b/board/sandburst/common/ppc440gx_i2c.c @@ -0,0 +1,515 @@ +/* + * Copyright (C) 2005 Sandburst Corporation + * + * 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 + */ + +/* + * Ported from cpu/ppc4xx/i2c.c by AS HARNOIS by + * Travis B. Sawyer + * Sandburst Corporation. + */ +#include <common.h> +#include <ppc4xx.h> +#if defined(CONFIG_440) +# include <440_i2c.h> +#else +# include <405gp_i2c.h> +#endif +#include <i2c.h> +#include <440_i2c.h> +#include <command.h> +#include "ppc440gx_i2c.h" + +#ifdef CONFIG_I2C_BUS1 + + + +#define IIC_OK 0 +#define IIC_NOK 1 +#define IIC_NOK_LA 2 /* Lost arbitration */ +#define IIC_NOK_ICT 3 /* Incomplete transfer */ +#define IIC_NOK_XFRA 4 /* Transfer aborted */ +#define IIC_NOK_DATA 5 /* No data in buffer */ +#define IIC_NOK_TOUT 6 /* Transfer timeout */ + +#define IIC_TIMEOUT 1 /* 1 second */ +#if defined(CFG_I2C_NOPROBES) +static uchar i2c_no_probes[] = CFG_I2C_NOPROBES; +#endif + +static void _i2c_bus1_reset (void) +{ + int i, status; + + /* Reset status register */ + /* write 1 in SCMP and IRQA to clear these fields */ + out8 (IIC_STS1, 0x0A); + + /* write 1 in IRQP IRQD LA ICT XFRA to clear these fields */ + out8 (IIC_EXTSTS1, 0x8F); + __asm__ volatile ("eieio"); + + /* + * Get current state, reset bus + * only if no transfers are pending. + */ + i = 10; + do { + /* Get status */ + status = in8 (IIC_STS1); + udelay (500); /* 500us */ + i--; + } while ((status & IIC_STS_PT) && (i > 0)); + /* Soft reset controller */ + status = in8 (IIC_XTCNTLSS1); + out8 (IIC_XTCNTLSS1, (status | IIC_XTCNTLSS_SRST)); + __asm__ volatile ("eieio"); + + /* make sure where in initial state, data hi, clock hi */ + out8 (IIC_DIRECTCNTL1, 0xC); + for (i = 0; i < 10; i++) { + if ((in8 (IIC_DIRECTCNTL1) & 0x3) != 0x3) { + /* clock until we get to known state */ + out8 (IIC_DIRECTCNTL1, 0x8); /* clock lo */ + udelay (100); /* 100us */ + out8 (IIC_DIRECTCNTL1, 0xC); /* clock hi */ + udelay (100); /* 100us */ + } else { + break; + } + } + /* send start condition */ + out8 (IIC_DIRECTCNTL1, 0x4); + udelay (1000); /* 1ms */ + /* send stop condition */ + out8 (IIC_DIRECTCNTL1, 0xC); + udelay (1000); /* 1ms */ + /* Unreset controller */ + out8 (IIC_XTCNTLSS1, (status & ~IIC_XTCNTLSS_SRST)); + udelay (1000); /* 1ms */ +} + +void i2c1_init (int speed, int slaveadd) +{ + sys_info_t sysInfo; + unsigned long freqOPB; + int val, divisor; + +#ifdef CFG_I2C_INIT_BOARD + /* call board specific i2c bus reset routine before accessing the */ + /* environment, which might be in a chip on that bus. For details */ + /* about this problem see doc/I2C_Edge_Conditions. */ + i2c_init_board(); +#endif + + /* Handle possible failed I2C state */ + /* FIXME: put this into i2c_init_board()? */ + _i2c_bus1_reset (); + + /* clear lo master address */ + out8 (IIC_LMADR1, 0); + + /* clear hi master address */ + out8 (IIC_HMADR1, 0); + + /* clear lo slave address */ + out8 (IIC_LSADR1, 0); + + /* clear hi slave address */ + out8 (IIC_HSADR1, 0); + + /* Clock divide Register */ + /* get OPB frequency */ + get_sys_info (&sysInfo); + freqOPB = sysInfo.freqPLB / sysInfo.pllOpbDiv; + /* set divisor according to freqOPB */ + divisor = (freqOPB - 1) / 10000000; + if (divisor == 0) + divisor = 1; + out8 (IIC_CLKDIV1, divisor); + + /* no interrupts */ + out8 (IIC_INTRMSK1, 0); + + /* clear transfer count */ + out8 (IIC_XFRCNT1, 0); + + /* clear extended control & stat */ + /* write 1 in SRC SRS SWC SWS to clear these fields */ + out8 (IIC_XTCNTLSS1, 0xF0); + + /* Mode Control Register + Flush Slave/Master data buffer */ + out8 (IIC_MDCNTL1, IIC_MDCNTL_FSDB | IIC_MDCNTL_FMDB); + __asm__ volatile ("eieio"); + + + val = in8(IIC_MDCNTL1); + __asm__ volatile ("eieio"); + + /* Ignore General Call, slave transfers are ignored, + disable interrupts, exit unknown bus state, enable hold + SCL + 100kHz normaly or FastMode for 400kHz and above + */ + + val |= IIC_MDCNTL_EUBS|IIC_MDCNTL_HSCL; + if( speed >= 400000 ){ + val |= IIC_MDCNTL_FSM; + } + out8 (IIC_MDCNTL1, val); + + /* clear control reg */ + out8 (IIC_CNTL1, 0x00); + __asm__ volatile ("eieio"); + +} + +/* + This code tries to use the features of the 405GP i2c + controller. It will transfer up to 4 bytes in one pass + on the loop. It only does out8(lbz) to the buffer when it + is possible to do out16(lhz) transfers. + + cmd_type is 0 for write 1 for read. + + addr_len can take any value from 0-255, it is only limited + by the char, we could make it larger if needed. If it is + 0 we skip the address write cycle. + + Typical case is a Write of an addr followd by a Read. The + IBM FAQ does not cover this. On the last byte of the write + we don't set the creg CHT bit, and on the first bytes of the + read we set the RPST bit. + + It does not support address only transfers, there must be + a data part. If you want to write the address yourself, put + it in the data pointer. + + It does not support transfer to/from address 0. + + It does not check XFRCNT. +*/ +static +int i2c_transfer1(unsigned char cmd_type, + unsigned char chip, + unsigned char addr[], + unsigned char addr_len, + unsigned char data[], + unsigned short data_len ) +{ + unsigned char* ptr; + int reading; + int tran,cnt; + int result; + int status; + int i; + uchar creg; + + if( data == 0 || data_len == 0 ){ + /*Don't support data transfer of no length or to address 0*/ + printf( "i2c_transfer: bad call\n" ); + return IIC_NOK; + } + if( addr && addr_len ){ + ptr = addr; + cnt = addr_len; + reading = 0; + }else{ + ptr = data; + cnt = data_len; + reading = cmd_type; + } + + /*Clear Stop Complete Bit*/ + out8(IIC_STS1,IIC_STS_SCMP); + /* Check init */ + i=10; + do { + /* Get status */ + status = in8(IIC_STS1); + __asm__ volatile("eieio"); + i--; + } while ((status & IIC_STS_PT) && (i>0)); + + if (status & IIC_STS_PT) { + result = IIC_NOK_TOUT; + return(result); + } + /*flush the Master/Slave Databuffers*/ + out8(IIC_MDCNTL1, ((in8(IIC_MDCNTL1))|IIC_MDCNTL_FMDB|IIC_MDCNTL_FSDB)); + /*need to wait 4 OPB clocks? code below should take that long*/ + + /* 7-bit adressing */ + out8(IIC_HMADR1,0); + out8(IIC_LMADR1, chip); + __asm__ volatile("eieio"); + + tran = 0; + result = IIC_OK; + creg = 0; + + while ( tran != cnt && (result == IIC_OK)) { + int bc,j; + + /* Control register = + Normal transfer, 7-bits adressing, Transfer up to bc bytes, Normal start, + Transfer is a sequence of transfers + */ + creg |= IIC_CNTL_PT; + + bc = (cnt - tran) > 4 ? 4 : + cnt - tran; + creg |= (bc-1)<<4; + /* if the real cmd type is write continue trans*/ + if ( (!cmd_type && (ptr == addr)) || ((tran+bc) != cnt) ) + creg |= IIC_CNTL_CHT; + + if (reading) + creg |= IIC_CNTL_READ; + else { + for(j=0; j<bc; j++) { + /* Set buffer */ + out8(IIC_MDBUF1,ptr[tran+j]); + __asm__ volatile("eieio"); + } + } + out8(IIC_CNTL1, creg ); + __asm__ volatile("eieio"); + + /* Transfer is in progress + we have to wait for upto 5 bytes of data + 1 byte chip address+r/w bit then bc bytes + of data. + udelay(10) is 1 bit time at 100khz + Doubled for slop. 20 is too small. + */ + i=2*5*8; + do { + /* Get status */ + status = in8(IIC_STS1); + __asm__ volatile("eieio"); + udelay (10); + i--; + } while ((status & IIC_STS_PT) && !(status & IIC_STS_ERR) + && (i>0)); + + if (status & IIC_STS_ERR) { + result = IIC_NOK; + status = in8 (IIC_EXTSTS1); + /* Lost arbitration? */ + if (status & IIC_EXTSTS_LA) + result = IIC_NOK_LA; + /* Incomplete transfer? */ + if (status & IIC_EXTSTS_ICT) + result = IIC_NOK_ICT; + /* Transfer aborted? */ + if (status & IIC_EXTSTS_XFRA) + result = IIC_NOK_XFRA; + } else if ( status & IIC_STS_PT) { + result = IIC_NOK_TOUT; + } + /* Command is reading => get buffer */ + if ((reading) && (result == IIC_OK)) { + /* Are there data in buffer */ + if (status & IIC_STS_MDBS) { + /* + even if we have data we have to wait 4OPB clocks + for it to hit the front of the FIFO, after that + we can just read. We should check XFCNT here and + if the FIFO is full there is no need to wait. + */ + udelay (1); + for(j=0;j<bc;j++) { + ptr[tran+j] = in8(IIC_MDBUF1); + __asm__ volatile("eieio"); + } + } else + result = IIC_NOK_DATA; + } + creg = 0; + tran+=bc; + if( ptr == addr && tran == cnt ) { + ptr = data; + cnt = data_len; + tran = 0; + reading = cmd_type; + if( reading ) + creg = IIC_CNTL_RPST; + } + } + return (result); +} + +int i2c_probe1 (uchar chip) +{ + uchar buf[1]; + + buf[0] = 0; + + /* + * What is needed is to send the chip address and verify that the + * address was <ACK>ed (i.e. there was a chip at that address which + * drove the data line low). + */ + return(i2c_transfer1 (1, chip << 1, 0,0, buf, 1) != 0); +} + + +int i2c_read1 (uchar chip, uint addr, int alen, uchar * buffer, int len) +{ + uchar xaddr[4]; + int ret; + + if ( alen > 4 ) { + printf ("I2C read: addr len %d not supported\n", alen); + return 1; + } + + if ( alen > 0 ) { + xaddr[0] = (addr >> 24) & 0xFF; + xaddr[1] = (addr >> 16) & 0xFF; + xaddr[2] = (addr >> 8) & 0xFF; + xaddr[3] = addr & 0xFF; + } + + +#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW + /* + * EEPROM chips that implement "address overflow" are ones + * like Catalyst 24WC04/08/16 which has 9/10/11 bits of + * address and the extra bits end up in the "chip address" + * bit slots. This makes a 24WC08 (1Kbyte) chip look like + * four 256 byte chips. + * + * Note that we consider the length of the address field to + * still be one byte because the extra address bits are + * hidden in the chip address. + */ + if( alen > 0 ) + chip |= ((addr >> (alen * 8)) & CFG_I2C_EEPROM_ADDR_OVERFLOW); +#endif + if( (ret = i2c_transfer1( 1, chip<<1, &xaddr[4-alen], alen, buffer, len )) != 0) { + printf( "I2c read: failed %d\n", ret); + return 1; + } + return 0; +} + +int i2c_write1 (uchar chip, uint addr, int alen, uchar * buffer, int len) +{ + uchar xaddr[4]; + + if ( alen > 4 ) { + printf ("I2C write: addr len %d not supported\n", alen); + return 1; + + } + if ( alen > 0 ) { + xaddr[0] = (addr >> 24) & 0xFF; + xaddr[1] = (addr >> 16) & 0xFF; + xaddr[2] = (addr >> 8) & 0xFF; + xaddr[3] = addr & 0xFF; + } + +#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW + /* + * EEPROM chips that implement "address overflow" are ones + * like Catalyst 24WC04/08/16 which has 9/10/11 bits of + * address and the extra bits end up in the "chip address" + * bit slots. This makes a 24WC08 (1Kbyte) chip look like + * four 256 byte chips. + * + * Note that we consider the length of the address field to + * still be one byte because the extra address bits are + * hidden in the chip address. + */ + if( alen > 0 ) + chip |= ((addr >> (alen * 8)) & CFG_I2C_EEPROM_ADDR_OVERFLOW); +#endif + + return (i2c_transfer1( 0, chip<<1, &xaddr[4-alen], alen, buffer, len ) != 0); +} + +/*----------------------------------------------------------------------- + * Read a register + */ +uchar i2c_reg_read1(uchar i2c_addr, uchar reg) +{ + char buf; + + i2c_read1(i2c_addr, reg, 1, &buf, 1); + + return(buf); +} + +/*----------------------------------------------------------------------- + * Write a register + */ +void i2c_reg_write1(uchar i2c_addr, uchar reg, uchar val) +{ + i2c_write1(i2c_addr, reg, 1, &val, 1); +} + + +int do_i2c1_probe(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + int j; +#if defined(CFG_I2C_NOPROBES) + int k, skip; +#endif + + puts ("Valid chip addresses:"); + for(j = 0; j < 128; j++) { +#if defined(CFG_I2C_NOPROBES) + skip = 0; + for (k = 0; k < sizeof(i2c_no_probes); k++){ + if (j == i2c_no_probes[k]){ + skip = 1; + break; + } + } + if (skip) + continue; +#endif + if(i2c_probe1(j) == 0) { + printf(" %02X", j); + } + } + putc ('\n'); + +#if defined(CFG_I2C_NOPROBES) + puts ("Excluded chip addresses:"); + for( k = 0; k < sizeof(i2c_no_probes); k++ ) + printf(" %02X", i2c_no_probes[k] ); + putc ('\n'); +#endif + + return 0; +} + +U_BOOT_CMD( + iprobe1, 1, 1, do_i2c1_probe, + "iprobe1 - probe to discover valid I2C chip addresses\n", + "\n -discover valid I2C chip addresses\n" +); + +#endif + |