#include <asm/arch/i2c.h>
#include <asm/io.h>
+#include "omap24xx_i2c.h"
+
+#define I2C_TIMEOUT 1000
+
static void wait_for_bb (void);
static u16 wait_for_pin (void);
static void flush_fifo(void);
+static struct i2c *i2c_base = (struct i2c *)I2C_DEFAULT_BASE;
+
+static unsigned int bus_initialized[I2C_BUS_MAX];
+static unsigned int current_bus;
+
void i2c_init (int speed, int slaveadd)
{
- u16 scl;
+ DECLARE_GLOBAL_DATA_PTR;
+ 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) &&
+ (speed != OMAP_I2C_FAST_MODE) &&
+ (speed != OMAP_I2C_HIGH_SPEED)) {
+ printf("Error : I2C unsupported speed %d\n", speed);
+ return;
+ }
- writew(0x2, I2C_SYSC); /* for ES2 after soft reset */
- udelay(1000);
- writew(0x0, I2C_SYSC); /* will probably self clear but */
+ psc = I2C_IP_CLK / I2C_INTERNAL_SAMPLING_CLK;
+ psc -= 1;
+ if (psc < I2C_PSC_MIN) {
+ printf("Error : I2C unsupported prescalar %d\n", psc);
+ return;
+ }
+
+ if (speed == OMAP_I2C_HIGH_SPEED) {
+ /* High speed */
+
+ /* For first phase of HS mode */
+ fsscll = fssclh = I2C_INTERNAL_SAMPLING_CLK /
+ (2 * OMAP_I2C_FAST_MODE);
+
+ fsscll -= I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM;
+ fssclh -= I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM;
+ if (((fsscll < 0) || (fssclh < 0)) ||
+ ((fsscll > 255) || (fssclh > 255))) {
+ printf("Error : I2C initializing first phase clock\n");
+ return;
+ }
- if (readw (I2C_CON) & I2C_CON_EN) {
- writew (0, I2C_CON);
+ /* For second phase of HS mode */
+ hsscll = hssclh = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
+
+ hsscll -= I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM;
+ hssclh -= I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM;
+ if (((fsscll < 0) || (fssclh < 0)) ||
+ ((fsscll > 255) || (fssclh > 255))) {
+ printf("Error : I2C initializing second phase clock\n");
+ return;
+ }
+
+ scll = (unsigned int)hsscll << 8 | (unsigned int)fsscll;
+ sclh = (unsigned int)hssclh << 8 | (unsigned int)fssclh;
+
+ } else {
+ /* Standard and fast speed */
+ fsscll = fssclh = I2C_INTERNAL_SAMPLING_CLK / (2 * speed);
+
+ fsscll -= I2C_FASTSPEED_SCLL_TRIM;
+ fssclh -= I2C_FASTSPEED_SCLH_TRIM;
+ if (((fsscll < 0) || (fssclh < 0)) ||
+ ((fsscll > 255) || (fssclh > 255))) {
+ printf("Error : I2C initializing clock\n");
+ return;
+ }
+
+ scll = (unsigned int)fsscll;
+ sclh = (unsigned int)fssclh;
+ }
+
+ if (readw (&i2c_base->con) & I2C_CON_EN) {
+ writew (0, &i2c_base->con);
udelay (50000);
}
- /* 12MHz I2C module clock */
- writew (0, I2C_PSC);
- speed = speed/1000; /* 100 or 400 */
- scl = ((12000/(speed*2)) - 7); /* use 7 when PSC = 0 */
- writew (scl, I2C_SCLL);
- writew (scl, I2C_SCLH);
+ 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) {
+ printf("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);
+
/* own address */
- writew (slaveadd, I2C_OA);
- writew (I2C_CON_EN, I2C_CON);
+ writew (slaveadd, &i2c_base->oa);
+ writew (I2C_CON_EN, &i2c_base->con);
/* have to enable intrrupts or OMAP i2c module doesn't work */
writew (I2C_IE_XRDY_IE | I2C_IE_RRDY_IE | I2C_IE_ARDY_IE |
- I2C_IE_NACK_IE | I2C_IE_AL_IE, I2C_IE);
+ I2C_IE_NACK_IE | I2C_IE_AL_IE, &i2c_base->ie);
udelay (1000);
flush_fifo();
- writew (0xFFFF, I2C_STAT);
- writew (0, I2C_CNT);
+ 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)
wait_for_bb ();
/* one byte only */
- writew (1, I2C_CNT);
+ writew (1, &i2c_base->cnt);
/* set slave address */
- writew (devaddr, I2C_SA);
+ writew (devaddr, &i2c_base->sa);
/* no stop bit needed here */
- writew (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX, I2C_CON);
-
- status = wait_for_pin ();
+ writew (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX, &i2c_base->con);
- if (status & I2C_STAT_XRDY) {
- /* Important: have to use byte access */
- writeb (regoffset, I2C_DATA);
- udelay (20000);
- if (readw (I2C_STAT) & I2C_STAT_NACK) {
+ /* 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;
}
- } else {
- i2c_error = 1;
}
- if (!i2c_error) {
- /* free bus, otherwise we can't use a combined transction */
- writew (0, I2C_CON);
- while (readw (I2C_STAT) || (readw (I2C_CON) & I2C_CON_MST)) {
- udelay (10000);
- /* Have to clear pending interrupt to clear I2C_STAT */
- writew (0xFFFF, I2C_STAT);
+ /* 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;
}
-
- wait_for_bb ();
- /* set slave address */
- writew (devaddr, I2C_SA);
- /* read one byte from slave */
- writew (1, I2C_CNT);
- /* need stop bit here */
- writew (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP,
- I2C_CON);
-
- status = wait_for_pin ();
if (status & I2C_STAT_RRDY) {
-#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
- *value = readb (I2C_DATA);
+#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
+ defined(CONFIG_OMAP44XX)
+ *value = readb(&i2c_base->data);
#else
- *value = readw (I2C_DATA);
+ *value = readw(&i2c_base->data);
#endif
- udelay (20000);
- } else {
- i2c_error = 1;
+ writew(I2C_STAT_RRDY, &i2c_base->stat);
}
-
- if (!i2c_error) {
- writew (I2C_CON_EN, I2C_CON);
- while (readw (I2C_STAT)
- || (readw (I2C_CON) & I2C_CON_MST)) {
- udelay (10000);
- writew (0xFFFF, I2C_STAT);
- }
+ if (status & I2C_STAT_ARDY) {
+ writew(I2C_STAT_ARDY, &i2c_base->stat);
+ break;
}
}
+
+read_exit:
flush_fifo();
- writew (0xFFFF, I2C_STAT);
- writew (0, I2C_CNT);
+ writew (0xFFFF, &i2c_base->stat);
+ writew (0, &i2c_base->cnt);
return i2c_error;
}
static int i2c_write_byte (u8 devaddr, u8 regoffset, u8 value)
{
int i2c_error = 0;
- u16 status, stat;
+ u16 status;
/* wait until bus not busy */
wait_for_bb ();
/* two bytes */
- writew (2, I2C_CNT);
+ writew (2, &i2c_base->cnt);
/* set slave address */
- writew (devaddr, I2C_SA);
+ writew (devaddr, &i2c_base->sa);
/* stop bit needed here */
writew (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
- I2C_CON_STP, I2C_CON);
-
- /* wait until state change */
- status = wait_for_pin ();
-
- if (status & I2C_STAT_XRDY) {
-#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
- /* send out 1 byte */
- writeb (regoffset, I2C_DATA);
- writew (I2C_STAT_XRDY, I2C_STAT);
-
- status = wait_for_pin ();
- if ((status & I2C_STAT_XRDY)) {
- /* send out next 1 byte */
- writeb (value, I2C_DATA);
- writew (I2C_STAT_XRDY, I2C_STAT);
- } else {
+ I2C_CON_STP, &i2c_base->con);
+
+ while (1) {
+ status = wait_for_pin();
+ if (status == 0 || status & I2C_STAT_NACK) {
i2c_error = 1;
+ goto write_exit;
}
+ if (status & I2C_STAT_XRDY) {
+#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
+ defined(CONFIG_OMAP44XX)
+ /* send register offset */
+ writeb(regoffset, &i2c_base->data);
+ writew(I2C_STAT_XRDY, &i2c_base->stat);
+
+ while (1) {
+ status = wait_for_pin();
+ if (status == 0 || status & I2C_STAT_NACK) {
+ i2c_error = 1;
+ goto write_exit;
+ }
+ if (status & I2C_STAT_XRDY) {
+ /* send data */
+ writeb(value, &i2c_base->data);
+ writew(I2C_STAT_XRDY, &i2c_base->stat);
+ }
+ if (status & I2C_STAT_ARDY) {
+ writew(I2C_STAT_ARDY, &i2c_base->stat);
+ break;
+ }
+ }
+ break;
#else
- /* send out two bytes */
- writew ((value << 8) + regoffset, I2C_DATA);
+ /* send out two bytes */
+ writew((value << 8) + regoffset, &i2c_base->data);
+ writew(I2C_STAT_XRDY, &i2c_base->stat);
#endif
- /* must have enough delay to allow BB bit to go low */
- udelay (50000);
- if (readw (I2C_STAT) & I2C_STAT_NACK) {
- i2c_error = 1;
}
- } else {
- i2c_error = 1;
+ if (status & I2C_STAT_ARDY) {
+ writew(I2C_STAT_ARDY, &i2c_base->stat);
+ break;
+ }
}
- if (!i2c_error) {
- int eout = 200;
+ wait_for_bb();
- writew (I2C_CON_EN, I2C_CON);
- while ((stat = readw (I2C_STAT)) || (readw (I2C_CON) & I2C_CON_MST)) {
- udelay (1000);
- /* have to read to clear intrrupt */
- writew (0xFFFF, I2C_STAT);
- if(--eout == 0) /* better leave with error than hang */
- break;
- }
- }
+ status = readw(&i2c_base->stat);
+ if (status & I2C_STAT_NACK)
+ i2c_error = 1;
+
+write_exit:
flush_fifo();
- writew (0xFFFF, I2C_STAT);
- writew (0, I2C_CNT);
+ writew (0xFFFF, &i2c_base->stat);
+ writew (0, &i2c_base->cnt);
return i2c_error;
}
* you get a bus error
*/
while(1){
- stat = readw(I2C_STAT);
+ stat = readw(&i2c_base->stat);
if(stat == I2C_STAT_RRDY){
-#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
- readb(I2C_DATA);
+#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
+ defined(CONFIG_OMAP44XX)
+ readb(&i2c_base->data);
#else
- readw(I2C_DATA);
+ readw(&i2c_base->data);
#endif
- writew(I2C_STAT_RRDY,I2C_STAT);
+ writew(I2C_STAT_RRDY,&i2c_base->stat);
udelay(1000);
}else
break;
int i2c_probe (uchar chip)
{
+ u16 status;
int res = 1; /* default = fail */
- if (chip == readw (I2C_OA)) {
+ if (chip == readw (&i2c_base->oa)) {
return res;
}
wait_for_bb ();
/* try to read one byte */
- writew (1, I2C_CNT);
+ writew (1, &i2c_base->cnt);
/* set slave address */
- writew (chip, I2C_SA);
+ writew (chip, &i2c_base->sa);
/* stop bit needed here */
- writew (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP, I2C_CON);
- /* enough delay for the NACK bit set */
- udelay (50000);
-
- if (!(readw (I2C_STAT) & I2C_STAT_NACK)) {
- res = 0; /* success case */
- flush_fifo();
- writew(0xFFFF, I2C_STAT);
- } else {
- writew(0xFFFF, I2C_STAT); /* failue, clear sources*/
- writew (readw (I2C_CON) | I2C_CON_STP, I2C_CON); /* finish up xfer */
- udelay(20000);
- wait_for_bb ();
+ writew (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP, &i2c_base->con);
+
+ 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);
+ wait_for_bb ();
+ 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)
+ readb(&i2c_base->data);
+#else
+ readw(&i2c_base->data);
+#endif
+ writew(I2C_STAT_RRDY, &i2c_base->stat);
+ }
}
+
+probe_exit:
flush_fifo();
- writew (0, I2C_CNT); /* don't allow any more data in...we don't want it.*/
- writew(0xFFFF, I2C_STAT);
+ writew (0, &i2c_base->cnt); /* don't allow any more data in...we don't want it.*/
+ writew(0xFFFF, &i2c_base->stat);
return res;
}
static void wait_for_bb (void)
{
- int timeout = 10;
+ int timeout = I2C_TIMEOUT;
u16 stat;
- writew(0xFFFF, I2C_STAT); /* clear current interruts...*/
- while ((stat = readw (I2C_STAT) & I2C_STAT_BB) && timeout--) {
- writew (stat, I2C_STAT);
- udelay (50000);
+ writew(0xFFFF, &i2c_base->stat); /* clear current interruts...*/
+ while ((stat = readw (&i2c_base->stat) & I2C_STAT_BB) && timeout--) {
+ writew (stat, &i2c_base->stat);
+ udelay(1000);
}
if (timeout <= 0) {
printf ("timed out in wait_for_bb: I2C_STAT=%x\n",
- readw (I2C_STAT));
+ readw (&i2c_base->stat));
}
- writew(0xFFFF, I2C_STAT); /* clear delayed stuff*/
+ writew(0xFFFF, &i2c_base->stat); /* clear delayed stuff*/
}
static u16 wait_for_pin (void)
{
u16 status;
- int timeout = 10;
+ int timeout = I2C_TIMEOUT;
do {
udelay (1000);
- status = readw (I2C_STAT);
+ status = readw (&i2c_base->stat);
} while ( !(status &
(I2C_STAT_ROVR | I2C_STAT_XUDF | I2C_STAT_XRDY |
I2C_STAT_RRDY | I2C_STAT_ARDY | I2C_STAT_NACK |
if (timeout <= 0) {
printf ("timed out in wait_for_pin: I2C_STAT=%x\n",
- readw (I2C_STAT));
- writew(0xFFFF, I2C_STAT);
-}
+ readw (&i2c_base->stat));
+ writew(0xFFFF, &i2c_base->stat);
+ status = 0;
+ }
+
return status;
}
+
+int i2c_set_bus_num(unsigned int bus)
+{
+ if ((bus < 0) || (bus >= I2C_BUS_MAX)) {
+ printf("Bad bus: %d\n", bus);
+ return -1;
+ }
+
+#if I2C_BUS_MAX==3
+ if (bus == 2)
+ i2c_base = (struct i2c *)I2C_BASE3;
+ else
+#endif
+ if (bus == 1)
+ i2c_base = (struct i2c *)I2C_BASE2;
+ else
+ i2c_base = (struct i2c *)I2C_BASE1;
+
+ current_bus = bus;
+
+ if(!bus_initialized[current_bus])
+ i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+
+ return 0;
+}
+
+int i2c_get_bus_num(void)
+{
+ return (int) current_bus;
+}
projects / u-boot / blobdiff