#define I2C_TIMEOUT 1000
-static void wait_for_bb(void);
+static int wait_for_bb(void);
static u16 wait_for_pin(void);
static void flush_fifo(void);
bus_initialized[current_bus] = 1;
}
-static int i2c_read_byte(u8 devaddr, u8 regoffset, u8 *value)
+static int i2c_read_byte(u8 devaddr, u16 regoffset, u8 alen, u8 *value)
{
int i2c_error = 0;
u16 status;
+ int i = 2 - alen;
+ u8 tmpbuf[2] = {(regoffset) >> 8, regoffset & 0xff};
+ u16 w;
/* wait until bus not busy */
- wait_for_bb();
+ if (wait_for_bb())
+ return 1;
/* one byte only */
- writew(1, &i2c_base->cnt);
+ writew(alen, &i2c_base->cnt);
/* set slave address */
writew(devaddr, &i2c_base->sa);
/* no stop bit needed here */
goto read_exit;
}
if (status & I2C_STAT_XRDY) {
- /* Important: have to use byte access */
- writeb(regoffset, &i2c_base->data);
+ w = tmpbuf[i++];
+#if !(defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
+ defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+ defined(CONFIG_OMAP54XX))
+ w |= tmpbuf[i++] << 8;
+#endif
+ writew(w, &i2c_base->data);
writew(I2C_STAT_XRDY, &i2c_base->stat);
}
if (status & I2C_STAT_ARDY) {
}
if (status & I2C_STAT_RRDY) {
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
- defined(CONFIG_OMAP44XX)
+ defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+ defined(CONFIG_OMAP54XX)
*value = readb(&i2c_base->data);
#else
*value = readw(&i2c_base->data);
stat = readw(&i2c_base->stat);
if (stat == I2C_STAT_RRDY) {
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
- defined(CONFIG_OMAP44XX)
+ defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+ defined(CONFIG_OMAP54XX)
readb(&i2c_base->data);
#else
readw(&i2c_base->data);
return res;
/* wait until bus not busy */
- wait_for_bb();
+ if (wait_for_bb())
+ return res;
- /* try to write one byte */
+ /* try to read one byte */
writew(1, &i2c_base->cnt);
/* set slave address */
writew(chip, &i2c_base->sa);
/* stop bit needed here */
- writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
- I2C_CON_STP, &i2c_base->con);
+ writew (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP, &i2c_base->con);
- status = wait_for_pin();
+ while (1) {
+ status = wait_for_pin();
+ if (status == 0 || status & I2C_STAT_AL) {
+ res = 1;
+ goto probe_exit;
+ }
+ if (status & I2C_STAT_NACK) {
+ res = 1;
+ writew(0xff, &i2c_base->stat);
+ writew (readw (&i2c_base->con) | I2C_CON_STP, &i2c_base->con);
- /* check for ACK (!NAK) */
- if (!(status & I2C_STAT_NACK))
- res = 0;
+ if (wait_for_bb())
+ res = 1;
- /* abort transfer (force idle state) */
- writew(0, &i2c_base->con);
+ break;
+ }
+ if (status & I2C_STAT_ARDY) {
+ writew(I2C_STAT_ARDY, &i2c_base->stat);
+ break;
+ }
+ if (status & I2C_STAT_RRDY) {
+ res = 0;
+#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
+ defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+ defined(CONFIG_OMAP54XX)
+ readb(&i2c_base->data);
+#else
+ readw(&i2c_base->data);
+#endif
+ writew(I2C_STAT_RRDY, &i2c_base->stat);
+ }
+ }
+probe_exit:
flush_fifo();
/* don't allow any more data in... we don't want it. */
writew(0, &i2c_base->cnt);
{
int i;
- if (alen > 1) {
+ if (alen > 2) {
printf("I2C read: addr len %d not supported\n", alen);
return 1;
}
- if (addr + len > 256) {
+ if (addr + len > (1 << 16)) {
puts("I2C read: address out of range\n");
return 1;
}
for (i = 0; i < len; i++) {
- if (i2c_read_byte(chip, addr + i, &buffer[i])) {
+ if (i2c_read_byte(chip, addr + i, alen, &buffer[i])) {
puts("I2C read: I/O error\n");
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
return 1;
int i;
u16 status;
int i2c_error = 0;
+ u16 w;
+ u8 tmpbuf[2] = {addr >> 8, addr & 0xff};
- if (alen > 1) {
+ if (alen > 2) {
printf("I2C write: addr len %d not supported\n", alen);
return 1;
}
- if (addr + len > 256) {
+ if (addr + len > (1 << 16)) {
printf("I2C write: address 0x%x + 0x%x out of range\n",
addr, len);
return 1;
}
/* wait until bus not busy */
- wait_for_bb();
+ if (wait_for_bb())
+ return 1;
/* start address phase - will write regoffset + len bytes data */
/* TODO consider case when !CONFIG_OMAP243X/34XX/44XX */
writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
I2C_CON_STP, &i2c_base->con);
- /* Send address byte */
- status = wait_for_pin();
-
- if (status == 0 || status & I2C_STAT_NACK) {
- i2c_error = 1;
- printf("error waiting for i2c address ACK (status=0x%x)\n",
- status);
- goto write_exit;
- }
-
- if (status & I2C_STAT_XRDY) {
- writeb(addr & 0xFF, &i2c_base->data);
- writew(I2C_STAT_XRDY, &i2c_base->stat);
- } else {
- i2c_error = 1;
- printf("i2c bus not ready for transmit (status=0x%x)\n",
- status);
- goto write_exit;
- }
-
- /* address phase is over, now write data */
- for (i = 0; i < len; i++) {
+ /* Send address and data */
+ for (i = -alen; i < len; i++) {
status = wait_for_pin();
if (status == 0 || status & I2C_STAT_NACK) {
}
if (status & I2C_STAT_XRDY) {
- writeb(buffer[i], &i2c_base->data);
+ w = (i < 0) ? tmpbuf[2+i] : buffer[i];
+#if !(defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
+ defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+ defined(CONFIG_OMAP54XX))
+ w |= ((++i < 0) ? tmpbuf[2+i] : buffer[i]) << 8;
+#endif
+ writew(w, &i2c_base->data);
writew(I2C_STAT_XRDY, &i2c_base->stat);
} else {
i2c_error = 1;
return i2c_error;
}
-static void wait_for_bb(void)
+static int wait_for_bb(void)
{
int timeout = I2C_TIMEOUT;
u16 stat;
if (timeout <= 0) {
printf("timed out in wait_for_bb: I2C_STAT=%x\n",
readw(&i2c_base->stat));
+ return 1;
}
writew(0xFFFF, &i2c_base->stat); /* clear delayed stuff*/
+ return 0;
}
static u16 wait_for_pin(void)
return -1;
}
+#if I2C_BUS_MAX == 4
+ if (bus == 3)
+ i2c_base = (struct i2c *)I2C_BASE4;
+ else
+ if (bus == 2)
+ i2c_base = (struct i2c *)I2C_BASE3;
+ else
+#endif
#if I2C_BUS_MAX == 3
if (bus == 2)
i2c_base = (struct i2c *)I2C_BASE3;