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Revert "ARM: I2C: I2C Multi byte address support"

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This reverts commits 2faa76196a as
this has introduced some large problems on all other platforms and have
more changes in them than the commit message implies.

Cc: Heiko Schocher <hs@denx.de>
Cc: Patil, Rachna <rachna@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>
master
Tom Rini 13 years ago committed by Heiko Schocher
parent c2459a405b
commit cec487a435
2 changed files with 173 additions and 296 deletions
  1. 467
      drivers/i2c/omap24xx_i2c.c
  2. 2
      drivers/i2c/omap24xx_i2c.h

467
drivers/i2c/omap24xx_i2c.c
Unescape View File

@ -29,11 +29,10 @@
DECLARE_GLOBAL_DATA_PTR;
#define I2C_STAT_TIMEO (1 << 31)
#define I2C_TIMEOUT 10
#define I2C_TIMEOUT 1000
static u32 wait_for_bb(void);
static u32 wait_for_status_mask(u16 mask);
static void wait_for_bb(void);
static u16 wait_for_pin(void);
static void flush_fifo(void);
/*
@ -51,6 +50,7 @@ void i2c_init(int speed, int slaveadd)
int psc, fsscll, fssclh;
int hsscll = 0, hssclh = 0;
u32 scll, sclh;
int timeout = I2C_TIMEOUT;
/* Only handle standard, fast and high speeds */
if ((speed != OMAP_I2C_STANDARD) &&
@ -112,14 +112,24 @@ void i2c_init(int speed, int slaveadd)
sclh = (unsigned int)fssclh;
}
if (gd->flags & GD_FLG_RELOC)
bus_initialized[current_bus] = 1;
if (readw(&i2c_base->con) & I2C_CON_EN) {
writew(0, &i2c_base->con);
udelay(50000);
}
writew(0x2, &i2c_base->sysc); /* for ES2 after soft reset */
udelay(1000);
writew(I2C_CON_EN, &i2c_base->con);
while (!(readw(&i2c_base->syss) & I2C_SYSS_RDONE) && timeout--) {
if (timeout <= 0) {
puts("ERROR: Timeout in soft-reset\n");
return;
}
udelay(1000);
}
writew(0, &i2c_base->con);
writew(psc, &i2c_base->psc);
writew(scll, &i2c_base->scll);
writew(sclh, &i2c_base->sclh);
@ -135,6 +145,81 @@ void i2c_init(int speed, int slaveadd)
flush_fifo();
writew(0xFFFF, &i2c_base->stat);
writew(0, &i2c_base->cnt);
if (gd->flags & GD_FLG_RELOC)
bus_initialized[current_bus] = 1;
}
static int i2c_read_byte(u8 devaddr, u8 regoffset, u8 *value)
{
int i2c_error = 0;
u16 status;
/* wait until bus not busy */
wait_for_bb();
/* one byte only */
writew(1, &i2c_base->cnt);
/* set slave address */
writew(devaddr, &i2c_base->sa);
/* no stop bit needed here */
writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT |
I2C_CON_TRX, &i2c_base->con);
/* send register offset */
while (1) {
status = wait_for_pin();
if (status == 0 || status & I2C_STAT_NACK) {
i2c_error = 1;
goto read_exit;
}
if (status & I2C_STAT_XRDY) {
/* Important: have to use byte access */
writeb(regoffset, &i2c_base->data);
writew(I2C_STAT_XRDY, &i2c_base->stat);
}
if (status & I2C_STAT_ARDY) {
writew(I2C_STAT_ARDY, &i2c_base->stat);
break;
}
}
/* set slave address */
writew(devaddr, &i2c_base->sa);
/* read one byte from slave */
writew(1, &i2c_base->cnt);
/* need stop bit here */
writew(I2C_CON_EN | I2C_CON_MST |
I2C_CON_STT | I2C_CON_STP,
&i2c_base->con);
/* receive data */
while (1) {
status = wait_for_pin();
if (status == 0 || status & I2C_STAT_NACK) {
i2c_error = 1;
goto read_exit;
}
if (status & I2C_STAT_RRDY) {
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
defined(CONFIG_OMAP44XX)
*value = readb(&i2c_base->data);
#else
*value = readw(&i2c_base->data);
#endif
writew(I2C_STAT_RRDY, &i2c_base->stat);
}
if (status & I2C_STAT_ARDY) {
writew(I2C_STAT_ARDY, &i2c_base->stat);
break;
}
}
read_exit:
flush_fifo();
writew(0xFFFF, &i2c_base->stat);
writew(0, &i2c_base->cnt);
return i2c_error;
}
static void flush_fifo(void)
@ -161,42 +246,32 @@ static void flush_fifo(void)
int i2c_probe(uchar chip)
{
u32 status;
u16 status;
int res = 1; /* default = fail */
if (chip == readw(&i2c_base->oa))
return res;
/* wait until bus not busy */
status = wait_for_bb();
/* exit on BUS busy */
if (status & I2C_STAT_TIMEO)
return res;
wait_for_bb();
/* try to write 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_STP, &i2c_base->con);
/* enough delay for the NACK bit set */
udelay(9000);
if (!(readw(&i2c_base->stat) & I2C_STAT_NACK)) {
res = 0; /* success case */
flush_fifo();
writew(0xFFFF, &i2c_base->stat);
} else {
/* failure, clear sources*/
writew(0xFFFF, &i2c_base->stat);
/* finish up xfer */
writew(readw(&i2c_base->con) | I2C_CON_STP, &i2c_base->con);
status = wait_for_bb();
/* exit on BUS busy */
if (status & I2C_STAT_TIMEO)
return res;
}
writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
I2C_CON_STP, &i2c_base->con);
status = wait_for_pin();
/* check for ACK (!NAK) */
if (!(status & I2C_STAT_NACK))
res = 0;
/* abort transfer (force idle state) */
writew(0, &i2c_base->con);
flush_fifo();
/* don't allow any more data in... we don't want it. */
writew(0, &i2c_base->cnt);
@ -206,309 +281,111 @@ int i2c_probe(uchar chip)
int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
{
int i2c_error = 0, i;
u32 status;
if ((alen > 2) || (alen < 0))
return 1;
int i;
if (alen < 2) {
if (addr + len > 256)
return 1;
} else if (addr + len > 0xFFFF) {
if (alen > 1) {
printf("I2C read: addr len %d not supported\n", alen);
return 1;
}
/* wait until bus not busy */
status = wait_for_bb();
/* exit on BUS busy */
if (status & I2C_STAT_TIMEO)
if (addr + len > 256) {
puts("I2C read: address out of range\n");
return 1;
writew((alen & 0xFF), &i2c_base->cnt);
/* set slave address */
writew(chip, &i2c_base->sa);
/* Clear the Tx & Rx FIFOs */
writew((readw(&i2c_base->buf) | I2C_RXFIFO_CLEAR |
I2C_TXFIFO_CLEAR), &i2c_base->buf);
/* no stop bit needed here */
writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_TRX |
I2C_CON_STT, &i2c_base->con);
/* wait for Transmit ready condition */
status = wait_for_status_mask(I2C_STAT_XRDY | I2C_STAT_NACK);
if (status & (I2C_STAT_NACK | I2C_STAT_TIMEO))
i2c_error = 1;
if (!i2c_error) {
if (status & I2C_STAT_XRDY) {
switch (alen) {
case 2:
/* Send address MSByte */
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
writew(((addr >> 8) & 0xFF), &i2c_base->data);
/* Clearing XRDY event */
writew((status & I2C_STAT_XRDY),
&i2c_base->stat);
/* wait for Transmit ready condition */
status = wait_for_status_mask(I2C_STAT_XRDY |
I2C_STAT_NACK);
if (status & (I2C_STAT_NACK |
I2C_STAT_TIMEO)) {
i2c_error = 1;
break;
}
#endif
case 1:
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
/* Send address LSByte */
writew((addr & 0xFF), &i2c_base->data);
#else
/* Send address Short word */
writew((addr & 0xFFFF), &i2c_base->data);
#endif
/* Clearing XRDY event */
writew((status & I2C_STAT_XRDY),
&i2c_base->stat);
/*wait for Transmit ready condition */
status = wait_for_status_mask(I2C_STAT_ARDY |
I2C_STAT_NACK);
if (status & (I2C_STAT_NACK |
I2C_STAT_TIMEO)) {
i2c_error = 1;
break;
}
}
} else
i2c_error = 1;
}
/* Wait for ARDY to set */
status = wait_for_status_mask(I2C_STAT_ARDY | I2C_STAT_NACK
| I2C_STAT_AL);
if (!i2c_error) {
/* set slave address */
writew(chip, &i2c_base->sa);
writew((len & 0xFF), &i2c_base->cnt);
/* Clear the Tx & Rx FIFOs */
writew((readw(&i2c_base->buf) | I2C_RXFIFO_CLEAR |
I2C_TXFIFO_CLEAR), &i2c_base->buf);
/* need stop bit here */
writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP,
&i2c_base->con);
for (i = 0; i < len; i++) {
/* wait for Receive condition */
status = wait_for_status_mask(I2C_STAT_RRDY |
I2C_STAT_NACK);
if (status & (I2C_STAT_NACK | I2C_STAT_TIMEO)) {
i2c_error = 1;
break;
}
if (status & I2C_STAT_RRDY) {
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
buffer[i] = readb(&i2c_base->data);
#else
*((u16 *)&buffer[i]) =
readw(&i2c_base->data) & 0xFFFF;
i++;
#endif
writew((status & I2C_STAT_RRDY),
&i2c_base->stat);
udelay(1000);
} else {
i2c_error = 1;
}
for (i = 0; i < len; i++) {
if (i2c_read_byte(chip, addr + i, &buffer[i])) {
puts("I2C read: I/O error\n");
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
return 1;
}
}
/* Wait for ARDY to set */
status = wait_for_status_mask(I2C_STAT_ARDY | I2C_STAT_NACK
| I2C_STAT_AL);
if (i2c_error) {
writew(0, &i2c_base->con);
return 1;
}
writew(I2C_CON_EN, &i2c_base->con);
while (readw(&i2c_base->stat)
|| (readw(&i2c_base->con) & I2C_CON_MST)) {
udelay(10000);
writew(0xFFFF, &i2c_base->stat);
}
writew(I2C_CON_EN, &i2c_base->con);
flush_fifo();
writew(0xFFFF, &i2c_base->stat);
writew(0, &i2c_base->cnt);
return 0;
}
int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
{
int i;
u16 status;
int i2c_error = 0;
int i, i2c_error = 0;
u32 status;
u16 writelen;
if (alen > 2)
if (alen > 1) {
printf("I2C write: addr len %d not supported\n", alen);
return 1;
}
if (alen < 2) {
if (addr + len > 256)
return 1;
} else if (addr + len > 0xFFFF) {
if (addr + len > 256) {
printf("I2C write: address 0x%x + 0x%x out of range\n",
addr, len);
return 1;
}
/* wait until bus not busy */
status = wait_for_bb();
/* exiting on BUS busy */
if (status & I2C_STAT_TIMEO)
return 1;
wait_for_bb();
writelen = (len & 0xFFFF) + alen;
/* two bytes */
writew((writelen & 0xFFFF), &i2c_base->cnt);
/* Clear the Tx & Rx FIFOs */
writew((readw(&i2c_base->buf) | I2C_RXFIFO_CLEAR |
I2C_TXFIFO_CLEAR), &i2c_base->buf);
/* start address phase - will write regoffset + len bytes data */
/* TODO consider case when !CONFIG_OMAP243X/34XX/44XX */
writew(alen + len, &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);
/* wait for Transmit ready condition */
status = wait_for_status_mask(I2C_STAT_XRDY | I2C_STAT_NACK);
/* Send address byte */
status = wait_for_pin();
if (status & (I2C_STAT_NACK | I2C_STAT_TIMEO))
if (status == 0 || status & I2C_STAT_NACK) {
i2c_error = 1;
if (!i2c_error) {
if (status & I2C_STAT_XRDY) {
switch (alen) {
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
case 2:
/* send out MSB byte */
writeb(((addr >> 8) & 0xFF), &i2c_base->data);
#else
writeb((addr & 0xFFFF), &i2c_base->data);
break;
#endif
/* Clearing XRDY event */
writew((status & I2C_STAT_XRDY),
&i2c_base->stat);
/*waiting for Transmit ready * condition */
status = wait_for_status_mask(I2C_STAT_XRDY |
I2C_STAT_NACK);
if (status & (I2C_STAT_NACK | I2C_STAT_TIMEO)) {
i2c_error = 1;
break;
}
case 1:
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
/* send out MSB byte */
writeb((addr & 0xFF), &i2c_base->data);
#else
writew(((buffer[0] << 8) | (addr & 0xFF)),
&i2c_base->data);
#endif
}
/* Clearing XRDY event */
writew((status & I2C_STAT_XRDY), &i2c_base->stat);
}
/* waiting for Transmit ready condition */
status = wait_for_status_mask(I2C_STAT_XRDY | I2C_STAT_NACK);
if (status & (I2C_STAT_NACK | I2C_STAT_TIMEO))
i2c_error = 1;
if (!i2c_error) {
for (i = ((alen > 1) ? 0 : 1); i < len; i++) {
if (status & I2C_STAT_XRDY) {
#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
writeb((buffer[i] & 0xFF),
&i2c_base->data);
#else
writew((((buffer[i] << 8) |
buffer[i + 1]) & 0xFFFF),
&i2c_base->data);
i++;
#endif
} else
i2c_error = 1;
/* Clearing XRDY event */
writew((status & I2C_STAT_XRDY),
&i2c_base->stat);
/* waiting for XRDY condition */
status = wait_for_status_mask(
I2C_STAT_XRDY |
I2C_STAT_ARDY |
I2C_STAT_NACK);
if (status & (I2C_STAT_NACK |
I2C_STAT_TIMEO)) {
i2c_error = 1;
break;
}
if (status & I2C_STAT_ARDY)
break;
}
}
printf("error waiting for i2c address ACK (status=0x%x)\n",
status);
goto write_exit;
}
status = wait_for_status_mask(I2C_STAT_ARDY | I2C_STAT_NACK |
I2C_STAT_AL);
if (status & (I2C_STAT_NACK | I2C_STAT_TIMEO))
if (status & I2C_STAT_XRDY) {
writeb(addr & 0xFF, &i2c_base->data);
writew(I2C_STAT_XRDY, &i2c_base->stat);
} else {
i2c_error = 1;
if (i2c_error) {
writew(0, &i2c_base->con);
return 1;
printf("i2c bus not ready for transmit (status=0x%x)\n",
status);
goto write_exit;
}
if (!i2c_error) {
int eout = 200;
/* address phase is over, now write data */
for (i = 0; i < len; i++) {
status = wait_for_pin();
writew(I2C_CON_EN, &i2c_base->con);
while ((status = readw(&i2c_base->stat)) ||
(readw(&i2c_base->con) & I2C_CON_MST)) {
udelay(1000);
/* have to read to clear intrrupt */
writew(0xFFFF, &i2c_base->stat);
if (--eout == 0)
/* better leave with error than hang */
break;
if (status == 0 || status & I2C_STAT_NACK) {
i2c_error = 1;
printf("i2c error waiting for data ACK (status=0x%x)\n",
status);
goto write_exit;
}
if (status & I2C_STAT_XRDY) {
writeb(buffer[i], &i2c_base->data);
writew(I2C_STAT_XRDY, &i2c_base->stat);
} else {
i2c_error = 1;
printf("i2c bus not ready for Tx (i=%d)\n", i);
goto write_exit;
}
}
write_exit:
flush_fifo();
writew(0xFFFF, &i2c_base->stat);
writew(0, &i2c_base->cnt);
return 0;
return i2c_error;
}
static u32 wait_for_bb(void)
static void wait_for_bb(void)
{
int timeout = I2C_TIMEOUT;
u32 stat;
u16 stat;
writew(0xFFFF, &i2c_base->stat); /* clear current interrupts...*/
while ((stat = readw(&i2c_base->stat) & I2C_STAT_BB) && timeout--) {
writew(stat, &i2c_base->stat);
udelay(1000);
@ -517,28 +394,30 @@ static u32 wait_for_bb(void)
if (timeout <= 0) {
printf("timed out in wait_for_bb: I2C_STAT=%x\n",
readw(&i2c_base->stat));
stat |= I2C_STAT_TIMEO;
}
writew(0xFFFF, &i2c_base->stat); /* clear delayed stuff*/
return stat;
}
static u32 wait_for_status_mask(u16 mask)
static u16 wait_for_pin(void)
{
u32 status;
u16 status;
int timeout = I2C_TIMEOUT;
do {
udelay(1000);
status = readw(&i2c_base->stat);
} while (!(status & mask) && timeout--);
} while (!(status &
(I2C_STAT_ROVR | I2C_STAT_XUDF | I2C_STAT_XRDY |
I2C_STAT_RRDY | I2C_STAT_ARDY | I2C_STAT_NACK |
I2C_STAT_AL)) && timeout--);
if (timeout <= 0) {
printf("timed out in wait_for_status_mask: I2C_STAT=%x\n",
printf("timed out in wait_for_pin: I2C_STAT=%x\n",
readw(&i2c_base->stat));
writew(0xFFFF, &i2c_base->stat);
status |= I2C_STAT_TIMEO;
status = 0;
}
return status;
}

2
drivers/i2c/omap24xx_i2c.h
Unescape View File

@ -60,9 +60,7 @@
/* I2C Buffer Configuration Register (I2C_BUF): */
#define I2C_BUF_RDMA_EN (1 << 15) /* Receive DMA channel enable */
#define I2C_RXFIFO_CLEAR (1 << 14) /* RX FIFO Clear */
#define I2C_BUF_XDMA_EN (1 << 7) /* Transmit DMA channel enable */
#define I2C_TXFIFO_CLEAR (1 << 6) /* TX FIFO clear */
/* I2C Configuration Register (I2C_CON): */

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