+++ /dev/null
-/*
- * Copyright 2006 Freescale Semiconductor, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * Version 2 as published by the Free Software Foundation.
- *
- * 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_FSL_I2C
-#ifdef CONFIG_HARD_I2C
-
-#include <command.h>
-#include <i2c.h> /* Functional interface */
-
-#include <asm/io.h>
-#include <asm/fsl_i2c.h> /* HW definitions */
-
-#define I2C_TIMEOUT (CFG_HZ / 4)
-
-#define I2C_READ_BIT 1
-#define I2C_WRITE_BIT 0
-
-/* 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.
- */
-#ifdef CFG_SPD_BUS_NUM
-static unsigned int i2c_bus_num __attribute__ ((section ("data"))) = CFG_SPD_BUS_NUM;
-#else
-static unsigned int i2c_bus_num __attribute__ ((section ("data"))) = 0;
-#endif
-
-static volatile struct fsl_i2c *i2c_dev[2] = {
- (struct fsl_i2c *) (CFG_IMMR + CFG_I2C_OFFSET),
-#ifdef CFG_I2C2_OFFSET
- (struct fsl_i2c *) (CFG_IMMR + CFG_I2C2_OFFSET)
-#endif
-};
-
-void
-i2c_init(int speed, int slaveadd)
-{
- volatile struct fsl_i2c *dev;
-
- dev = (struct fsl_i2c *) (CFG_IMMR + CFG_I2C_OFFSET);
-
- writeb(0, &dev->cr); /* stop I2C controller */
- udelay(5); /* let it shutdown in peace */
- writeb(0x3F, &dev->fdr); /* set bus speed */
- writeb(0x3F, &dev->dfsrr); /* set default filter */
- writeb(slaveadd << 1, &dev->adr); /* write slave address */
- writeb(0x0, &dev->sr); /* clear status register */
- writeb(I2C_CR_MEN, &dev->cr); /* start I2C controller */
-
-#ifdef CFG_I2C2_OFFSET
- dev = (struct fsl_i2c *) (CFG_IMMR + CFG_I2C2_OFFSET);
-
- writeb(0, &dev->cr); /* stop I2C controller */
- udelay(5); /* let it shutdown in peace */
- writeb(0x3F, &dev->fdr); /* set bus speed */
- writeb(0x3F, &dev->dfsrr); /* set default filter */
- writeb(slaveadd << 1, &dev->adr); /* write slave address */
- writeb(0x0, &dev->sr); /* clear status register */
- writeb(I2C_CR_MEN, &dev->cr); /* start I2C controller */
-#endif /* CFG_I2C2_OFFSET */
-}
-
-static __inline__ int
-i2c_wait4bus(void)
-{
- ulong timeval = get_timer(0);
-
- while (readb(&i2c_dev[i2c_bus_num]->sr) & I2C_SR_MBB) {
- if (get_timer(timeval) > I2C_TIMEOUT) {
- return -1;
- }
- }
-
- return 0;
-}
-
-static __inline__ int
-i2c_wait(int write)
-{
- u32 csr;
- ulong timeval = get_timer(0);
-
- do {
- csr = readb(&i2c_dev[i2c_bus_num]->sr);
- if (!(csr & I2C_SR_MIF))
- continue;
-
- writeb(0x0, &i2c_dev[i2c_bus_num]->sr);
-
- if (csr & I2C_SR_MAL) {
- debug("i2c_wait: MAL\n");
- return -1;
- }
-
- if (!(csr & I2C_SR_MCF)) {
- debug("i2c_wait: unfinished\n");
- return -1;
- }
-
- if (write == I2C_WRITE_BIT && (csr & I2C_SR_RXAK)) {
- debug("i2c_wait: No RXACK\n");
- return -1;
- }
-
- return 0;
- } while (get_timer (timeval) < I2C_TIMEOUT);
-
- debug("i2c_wait: timed out\n");
- return -1;
-}
-
-static __inline__ int
-i2c_write_addr (u8 dev, u8 dir, int rsta)
-{
- writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX
- | (rsta ? I2C_CR_RSTA : 0),
- &i2c_dev[i2c_bus_num]->cr);
-
- writeb((dev << 1) | dir, &i2c_dev[i2c_bus_num]->dr);
-
- if (i2c_wait(I2C_WRITE_BIT) < 0)
- return 0;
-
- return 1;
-}
-
-static __inline__ int
-__i2c_write(u8 *data, int length)
-{
- int i;
-
- writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX,
- &i2c_dev[i2c_bus_num]->cr);
-
- for (i = 0; i < length; i++) {
- writeb(data[i], &i2c_dev[i2c_bus_num]->dr);
-
- if (i2c_wait(I2C_WRITE_BIT) < 0)
- break;
- }
-
- return i;
-}
-
-static __inline__ int
-__i2c_read(u8 *data, int length)
-{
- int i;
-
- writeb(I2C_CR_MEN | I2C_CR_MSTA | ((length == 1) ? I2C_CR_TXAK : 0),
- &i2c_dev[i2c_bus_num]->cr);
-
- /* dummy read */
- readb(&i2c_dev[i2c_bus_num]->dr);
-
- for (i = 0; i < length; i++) {
- if (i2c_wait(I2C_READ_BIT) < 0)
- break;
-
- /* Generate ack on last next to last byte */
- if (i == length - 2)
- writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_TXAK,
- &i2c_dev[i2c_bus_num]->cr);
-
- /* Generate stop on last byte */
- if (i == length - 1)
- writeb(I2C_CR_MEN | I2C_CR_TXAK, &i2c_dev[i2c_bus_num]->cr);
-
- data[i] = readb(&i2c_dev[i2c_bus_num]->dr);
- }
-
- return i;
-}
-
-int
-i2c_read(u8 dev, uint addr, int alen, u8 *data, int length)
-{
- int i = -1; /* signal error */
- u8 *a = (u8*)&addr;
-
- if (i2c_wait4bus() >= 0
- && i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0
- && __i2c_write(&a[4 - alen], alen) == alen)
- i = 0; /* No error so far */
-
- if (length
- && i2c_write_addr(dev, I2C_READ_BIT, 1) != 0)
- i = __i2c_read(data, length);
-
- writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr);
-
- if (i == length)
- return 0;
-
- return -1;
-}
-
-int
-i2c_write(u8 dev, uint addr, int alen, u8 *data, int length)
-{
- int i = -1; /* signal error */
- u8 *a = (u8*)&addr;
-
- if (i2c_wait4bus() >= 0
- && i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0
- && __i2c_write(&a[4 - alen], alen) == alen) {
- i = __i2c_write(data, length);
- }
-
- writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr);
-
- if (i == length)
- return 0;
-
- return -1;
-}
-
-int
-i2c_probe(uchar chip)
-{
- /* For unknow reason the controller will ACK when
- * probing for a slave with the same address, so skip
- * it.
- */
- if (chip == (readb(&i2c_dev[i2c_bus_num]->adr) >> 1))
- return -1;
-
- return i2c_read(chip, 0, 0, NULL, 0);
-}
-
-uchar
-i2c_reg_read(uchar i2c_addr, uchar reg)
-{
- uchar buf[1];
-
- i2c_read(i2c_addr, reg, 1, buf, 1);
-
- return buf[0];
-}
-
-void
-i2c_reg_write(uchar i2c_addr, uchar reg, uchar val)
-{
- i2c_write(i2c_addr, reg, 1, &val, 1);
-}
-
-int i2c_set_bus_num(unsigned int bus)
-{
-#ifdef CFG_I2C2_OFFSET
- if (bus > 1) {
-#else
- if (bus > 0) {
-#endif
- return -1;
- }
-
- i2c_bus_num = bus;
-
- return 0;
-}
-
-int i2c_set_bus_speed(unsigned int speed)
-{
- return -1;
-}
-
-unsigned int i2c_get_bus_num(void)
-{
- return i2c_bus_num;
-}
-
-unsigned int i2c_get_bus_speed(void)
-{
- return 0;
-}
-#endif /* CONFIG_HARD_I2C */
-#endif /* CONFIG_FSL_I2C */
projects / karo-tx-uboot.git / blobdiff