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-rw-r--r--cpu/ppc4xx/i2c.c439
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diff --git a/cpu/ppc4xx/i2c.c b/cpu/ppc4xx/i2c.c
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--- a/cpu/ppc4xx/i2c.c
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-/*
- * (C) Copyright 2007-2009
- * Stefan Roese, DENX Software Engineering, sr@denx.de.
- *
- * based on work by Anne Sophie Harnois <anne-sophie.harnois@nextream.fr>
- *
- * (C) Copyright 2001
- * Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
- *
- * 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>
-#include <ppc4xx.h>
-#include <4xx_i2c.h>
-#include <i2c.h>
-#include <asm-ppc/io.h>
-
-#ifdef CONFIG_HARD_I2C
-
-DECLARE_GLOBAL_DATA_PTR;
-
-#if defined(CONFIG_I2C_MULTI_BUS)
-/*
- * Initialize the bus pointer to whatever one the SPD EEPROM is on.
- * Default is bus 0. This is necessary because the DDR initialization
- * runs from ROM, and we can't switch buses because we can't modify
- * the global variables.
- */
-#ifndef CONFIG_SYS_SPD_BUS_NUM
-#define CONFIG_SYS_SPD_BUS_NUM 0
-#endif
-static unsigned int i2c_bus_num __attribute__ ((section (".data"))) =
- CONFIG_SYS_SPD_BUS_NUM;
-#endif /* CONFIG_I2C_MULTI_BUS */
-
-static void _i2c_bus_reset(void)
-{
- struct ppc4xx_i2c *i2c = (struct ppc4xx_i2c *)I2C_BASE_ADDR;
- int i;
- u8 dc;
-
- /* Reset status register */
- /* write 1 in SCMP and IRQA to clear these fields */
- out_8(&i2c->sts, 0x0A);
-
- /* write 1 in IRQP IRQD LA ICT XFRA to clear these fields */
- out_8(&i2c->extsts, 0x8F);
-
- /* Place chip in the reset state */
- out_8(&i2c->xtcntlss, IIC_XTCNTLSS_SRST);
-
- /* Check if bus is free */
- dc = in_8(&i2c->directcntl);
- if (!DIRCTNL_FREE(dc)){
- /* Try to set bus free state */
- out_8(&i2c->directcntl, IIC_DIRCNTL_SDAC | IIC_DIRCNTL_SCC);
-
- /* Wait until we regain bus control */
- for (i = 0; i < 100; ++i) {
- dc = in_8(&i2c->directcntl);
- if (DIRCTNL_FREE(dc))
- break;
-
- /* Toggle SCL line */
- dc ^= IIC_DIRCNTL_SCC;
- out_8(&i2c->directcntl, dc);
- udelay(10);
- dc ^= IIC_DIRCNTL_SCC;
- out_8(&i2c->directcntl, dc);
- }
- }
-
- /* Remove reset */
- out_8(&i2c->xtcntlss, 0);
-}
-
-void i2c_init(int speed, int slaveaddr)
-{
- struct ppc4xx_i2c *i2c;
- int val, divisor;
- int bus;
-
-#ifdef CONFIG_SYS_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
-
- for (bus = 0; bus < CONFIG_SYS_MAX_I2C_BUS; bus++) {
- I2C_SET_BUS(bus);
-
- /* Set i2c pointer after calling I2C_SET_BUS() */
- i2c = (struct ppc4xx_i2c *)I2C_BASE_ADDR;
-
- /* Handle possible failed I2C state */
- /* FIXME: put this into i2c_init_board()? */
- _i2c_bus_reset();
-
- /* clear lo master address */
- out_8(&i2c->lmadr, 0);
-
- /* clear hi master address */
- out_8(&i2c->hmadr, 0);
-
- /* clear lo slave address */
- out_8(&i2c->lsadr, 0);
-
- /* clear hi slave address */
- out_8(&i2c->hsadr, 0);
-
- /* Clock divide Register */
- /* set divisor according to freq_opb */
- divisor = (get_OPB_freq() - 1) / 10000000;
- if (divisor == 0)
- divisor = 1;
- out_8(&i2c->clkdiv, divisor);
-
- /* no interrupts */
- out_8(&i2c->intrmsk, 0);
-
- /* clear transfer count */
- out_8(&i2c->xfrcnt, 0);
-
- /* clear extended control & stat */
- /* write 1 in SRC SRS SWC SWS to clear these fields */
- out_8(&i2c->xtcntlss, 0xF0);
-
- /* Mode Control Register
- Flush Slave/Master data buffer */
- out_8(&i2c->mdcntl, IIC_MDCNTL_FSDB | IIC_MDCNTL_FMDB);
-
- val = in_8(&i2c->mdcntl);
-
- /* 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;
- out_8(&i2c->mdcntl, val);
-
- /* clear control reg */
- out_8(&i2c->cntl, 0x00);
- }
-
- /* set to SPD bus as default bus upon powerup */
- I2C_SET_BUS(CONFIG_SYS_SPD_BUS_NUM);
-}
-
-/*
- * 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 out_8((u8 *)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_transfer(unsigned char cmd_type,
- unsigned char chip,
- unsigned char addr[],
- unsigned char addr_len,
- unsigned char data[],
- unsigned short data_len)
-{
- struct ppc4xx_i2c *i2c = (struct ppc4xx_i2c *)I2C_BASE_ADDR;
- u8 *ptr;
- int reading;
- int tran, cnt;
- int result;
- int status;
- int i;
- u8 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 */
- out_8(&i2c->sts, IIC_STS_SCMP);
-
- /* Check init */
- i = 10;
- do {
- /* Get status */
- status = in_8(&i2c->sts);
- i--;
- } while ((status & IIC_STS_PT) && (i > 0));
-
- if (status & IIC_STS_PT) {
- result = IIC_NOK_TOUT;
- return(result);
- }
-
- /* flush the Master/Slave Databuffers */
- out_8(&i2c->mdcntl, in_8(&i2c->mdcntl) |
- IIC_MDCNTL_FMDB | IIC_MDCNTL_FSDB);
-
- /* need to wait 4 OPB clocks? code below should take that long */
-
- /* 7-bit adressing */
- out_8(&i2c->hmadr, 0);
- out_8(&i2c->lmadr, chip);
-
- 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 */
- out_8(&i2c->mdbuf, ptr[tran + j]);
- }
- }
- out_8(&i2c->cntl, creg);
-
- /*
- * 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 = in_8(&i2c->sts);
- udelay(10);
- i--;
- } while ((status & IIC_STS_PT) && !(status & IIC_STS_ERR) &&
- (i > 0));
-
- if (status & IIC_STS_ERR) {
- result = IIC_NOK;
- status = in_8(&i2c->extsts);
- /* 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] = in_8(&i2c->mdbuf);
- } 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_probe(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_transfer(1, chip << 1, 0, 0, buf, 1) != 0);
-}
-
-static int ppc4xx_i2c_transfer(uchar chip, uint addr, int alen, uchar *buffer,
- int len, int read)
-{
- uchar xaddr[4];
- int ret;
-
- if (alen > 4) {
- printf("I2C: 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 CONFIG_SYS_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)) &
- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
-#endif
- if ((ret = i2c_transfer(read, chip << 1, &xaddr[4 - alen], alen,
- buffer, len)) != 0) {
- if (gd->have_console) {
- printf("I2C %s: failed %d\n",
- read ? "read" : "write", ret);
- }
-
- return 1;
- }
-
- return 0;
-}
-
-int i2c_read(uchar chip, uint addr, int alen, uchar * buffer, int len)
-{
- return ppc4xx_i2c_transfer(chip, addr, alen, buffer, len, 1);
-}
-
-int i2c_write(uchar chip, uint addr, int alen, uchar * buffer, int len)
-{
- return ppc4xx_i2c_transfer(chip, addr, alen, buffer, len, 0);
-}
-
-#if defined(CONFIG_I2C_MULTI_BUS)
-/*
- * Functions for multiple I2C bus handling
- */
-unsigned int i2c_get_bus_num(void)
-{
- return i2c_bus_num;
-}
-
-int i2c_set_bus_num(unsigned int bus)
-{
- if (bus >= CONFIG_SYS_MAX_I2C_BUS)
- return -1;
-
- i2c_bus_num = bus;
-
- return 0;
-}
-#endif /* CONFIG_I2C_MULTI_BUS */
-#endif /* CONFIG_HARD_I2C */
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