diff options
| -rw-r--r-- | drivers/i2c/omap24xx_i2c.c | 105 |
1 files changed, 53 insertions, 52 deletions
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c index 8effc5d52..4ae237aa8 100644 --- a/drivers/i2c/omap24xx_i2c.c +++ b/drivers/i2c/omap24xx_i2c.c @@ -31,8 +31,8 @@ DECLARE_GLOBAL_DATA_PTR; #define I2C_TIMEOUT 1000 -static void wait_for_bb (void); -static u16 wait_for_pin (void); +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; @@ -40,7 +40,7 @@ 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) +void i2c_init(int speed, int slaveadd) { int psc, fsscll, fssclh; int hsscll = 0, hssclh = 0; @@ -107,9 +107,9 @@ void i2c_init (int speed, int slaveadd) sclh = (unsigned int)fssclh; } - if (readw (&i2c_base->con) & I2C_CON_EN) { - writew (0, &i2c_base->con); - udelay (50000); + 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 */ @@ -130,35 +130,36 @@ void i2c_init (int speed, int slaveadd) writew(sclh, &i2c_base->sclh); /* own address */ - writew (slaveadd, &i2c_base->oa); - writew (I2C_CON_EN, &i2c_base->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 | + writew(I2C_IE_XRDY_IE | I2C_IE_RRDY_IE | I2C_IE_ARDY_IE | I2C_IE_NACK_IE | I2C_IE_AL_IE, &i2c_base->ie); - udelay (1000); + udelay(1000); flush_fifo(); - writew (0xFFFF, &i2c_base->stat); - writew (0, &i2c_base->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) +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 (); + wait_for_bb(); /* one byte only */ - writew (1, &i2c_base->cnt); + writew(1, &i2c_base->cnt); /* set slave address */ - writew (devaddr, &i2c_base->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_base->con); + writew(I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | + I2C_CON_TRX, &i2c_base->con); /* send register offset */ while (1) { @@ -196,7 +197,7 @@ static int i2c_read_byte (u8 devaddr, u8 regoffset, u8 * value) } if (status & I2C_STAT_RRDY) { #if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \ - defined(CONFIG_OMAP44XX) + defined(CONFIG_OMAP44XX) *value = readb(&i2c_base->data); #else *value = readw(&i2c_base->data); @@ -211,8 +212,8 @@ static int i2c_read_byte (u8 devaddr, u8 regoffset, u8 * value) read_exit: flush_fifo(); - writew (0xFFFF, &i2c_base->stat); - writew (0, &i2c_base->cnt); + writew(0xFFFF, &i2c_base->stat); + writew(0, &i2c_base->cnt); return i2c_error; } @@ -222,38 +223,37 @@ static void flush_fifo(void) /* note: if you try and read data when its not there or ready * you get a bus error */ - while(1){ + while (1) { stat = readw(&i2c_base->stat); - if(stat == I2C_STAT_RRDY){ + if (stat == I2C_STAT_RRDY) { #if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \ - defined(CONFIG_OMAP44XX) + defined(CONFIG_OMAP44XX) readb(&i2c_base->data); #else readw(&i2c_base->data); #endif - writew(I2C_STAT_RRDY,&i2c_base->stat); + writew(I2C_STAT_RRDY, &i2c_base->stat); udelay(1000); - }else + } else break; } } -int i2c_probe (uchar chip) +int i2c_probe(uchar chip) { u16 status; int res = 1; /* default = fail */ - if (chip == readw (&i2c_base->oa)) { + if (chip == readw(&i2c_base->oa)) return res; - } /* wait until bus not busy */ - wait_for_bb (); + wait_for_bb(); /* try to write one byte */ - writew (1, &i2c_base->cnt); + writew(1, &i2c_base->cnt); /* set slave address */ - writew (chip, &i2c_base->sa); + 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); @@ -268,29 +268,30 @@ int i2c_probe (uchar chip) writew(0, &i2c_base->con); flush_fifo(); - writew (0, &i2c_base->cnt); /* don't allow any more data in...we don't want it.*/ + /* don't allow any more data in... we don't want it. */ + writew(0, &i2c_base->cnt); writew(0xFFFF, &i2c_base->stat); return res; } -int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len) +int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) { int i; if (alen > 1) { - printf ("I2C read: addr len %d not supported\n", alen); + printf("I2C read: addr len %d not supported\n", alen); return 1; } if (addr + len > 256) { - printf ("I2C read: address out of range\n"); + printf("I2C read: address out of range\n"); return 1; } for (i = 0; i < len; i++) { - if (i2c_read_byte (chip, addr + i, &buffer[i])) { - printf ("I2C read: I/O error\n"); - i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); + if (i2c_read_byte(chip, addr + i, &buffer[i])) { + printf("I2C read: I/O error\n"); + i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); return 1; } } @@ -298,7 +299,7 @@ int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len) return 0; } -int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len) +int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) { int i; u16 status; @@ -374,40 +375,40 @@ write_exit: return i2c_error; } -static void wait_for_bb (void) +static void wait_for_bb(void) { int timeout = I2C_TIMEOUT; 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); + 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_base->stat)); + printf("timed out in wait_for_bb: I2C_STAT=%x\n", + readw(&i2c_base->stat)); } writew(0xFFFF, &i2c_base->stat); /* clear delayed stuff*/ } -static u16 wait_for_pin (void) +static u16 wait_for_pin(void) { u16 status; int timeout = I2C_TIMEOUT; do { - udelay (1000); - status = readw (&i2c_base->stat); - } while ( !(status & + udelay(1000); + 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 | I2C_STAT_AL)) && timeout--); if (timeout <= 0) { - printf ("timed out in wait_for_pin: I2C_STAT=%x\n", - readw (&i2c_base->stat)); + printf("timed out in wait_for_pin: I2C_STAT=%x\n", + readw(&i2c_base->stat)); writew(0xFFFF, &i2c_base->stat); status = 0; } @@ -422,7 +423,7 @@ int i2c_set_bus_num(unsigned int bus) return -1; } -#if I2C_BUS_MAX==3 +#if I2C_BUS_MAX == 3 if (bus == 2) i2c_base = (struct i2c *)I2C_BASE3; else @@ -434,7 +435,7 @@ int i2c_set_bus_num(unsigned int bus) current_bus = bus; - if(!bus_initialized[current_bus]) + if (!bus_initialized[current_bus]) i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); return 0; |