diff options
Diffstat (limited to 'drivers/fsl_i2c.c')
| -rw-r--r-- | drivers/fsl_i2c.c | 130 |
1 files changed, 91 insertions, 39 deletions
diff --git a/drivers/fsl_i2c.c b/drivers/fsl_i2c.c index 65c2743..c929096 100644 --- a/drivers/fsl_i2c.c +++ b/drivers/fsl_i2c.c @@ -28,29 +28,52 @@ #include <asm/fsl_i2c.h> /* HW definitions */ #define I2C_TIMEOUT (CFG_HZ / 4) -#define I2C ((struct fsl_i2c *)(CFG_IMMR + CFG_I2C_OFFSET)) +#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) { - /* stop I2C controller */ - writeb(0x0, &I2C->cr); - - /* set clock */ - writeb(0x3f, &I2C->fdr); - - /* set default filter */ - writeb(0x10, &I2C->dfsrr); - - /* write slave address */ - writeb(slaveadd, &I2C->adr); - - /* clear status register */ - writeb(0x0, &I2C->sr); - - /* start I2C controller */ - writeb(I2C_CR_MEN, &I2C->cr); + volatile struct fsl_i2c *dev; + + dev = (struct fsl_i2c *) (CFG_IMMR + CFG_I2C_OFFSET); + + writeb(0, &dev->cr); /* stop I2C controller */ + 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 */ + writeb(0x3F, &dev->fdr); /* set bus speed */ + writeb(0x3F, &dev->dfsrr); /* set default filter */ + writeb(slaveadd, &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 @@ -58,7 +81,7 @@ i2c_wait4bus(void) { ulong timeval = get_timer(0); - while (readb(&I2C->sr) & I2C_SR_MBB) { + while (readb(&i2c_dev[i2c_bus_num]->sr) & I2C_SR_MBB) { if (get_timer(timeval) > I2C_TIMEOUT) { return -1; } @@ -74,11 +97,11 @@ i2c_wait(int write) ulong timeval = get_timer(0); do { - csr = readb(&I2C->sr); + csr = readb(&i2c_dev[i2c_bus_num]->sr); if (!(csr & I2C_SR_MIF)) continue; - writeb(0x0, &I2C->sr); + writeb(0x0, &i2c_dev[i2c_bus_num]->sr); if (csr & I2C_SR_MAL) { debug("i2c_wait: MAL\n"); @@ -90,7 +113,7 @@ i2c_wait(int write) return -1; } - if (write == I2C_WRITE && (csr & I2C_SR_RXAK)) { + if (write == I2C_WRITE_BIT && (csr & I2C_SR_RXAK)) { debug("i2c_wait: No RXACK\n"); return -1; } @@ -107,11 +130,11 @@ 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->cr); + &i2c_dev[i2c_bus_num]->cr); - writeb((dev << 1) | dir, &I2C->dr); + writeb((dev << 1) | dir, &i2c_dev[i2c_bus_num]->dr); - if (i2c_wait(I2C_WRITE) < 0) + if (i2c_wait(I2C_WRITE_BIT) < 0) return 0; return 1; @@ -123,12 +146,12 @@ __i2c_write(u8 *data, int length) int i; writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX, - &I2C->cr); + &i2c_dev[i2c_bus_num]->cr); for (i = 0; i < length; i++) { - writeb(data[i], &I2C->dr); + writeb(data[i], &i2c_dev[i2c_bus_num]->dr); - if (i2c_wait(I2C_WRITE) < 0) + if (i2c_wait(I2C_WRITE_BIT) < 0) break; } @@ -141,25 +164,25 @@ __i2c_read(u8 *data, int length) int i; writeb(I2C_CR_MEN | I2C_CR_MSTA | ((length == 1) ? I2C_CR_TXAK : 0), - &I2C->cr); + &i2c_dev[i2c_bus_num]->cr); /* dummy read */ - readb(&I2C->dr); + readb(&i2c_dev[i2c_bus_num]->dr); for (i = 0; i < length; i++) { - if (i2c_wait(I2C_READ) < 0) + 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->cr); + &i2c_dev[i2c_bus_num]->cr); /* Generate stop on last byte */ if (i == length - 1) - writeb(I2C_CR_MEN | I2C_CR_TXAK, &I2C->cr); + writeb(I2C_CR_MEN | I2C_CR_TXAK, &i2c_dev[i2c_bus_num]->cr); - data[i] = readb(&I2C->dr); + data[i] = readb(&i2c_dev[i2c_bus_num]->dr); } return i; @@ -172,13 +195,13 @@ i2c_read(u8 dev, uint addr, int alen, u8 *data, int length) u8 *a = (u8*)&addr; if (i2c_wait4bus() >= 0 - && i2c_write_addr(dev, I2C_WRITE, 0) != 0 + && i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0 && __i2c_write(&a[4 - alen], alen) == alen - && i2c_write_addr(dev, I2C_READ, 1) != 0) { + && i2c_write_addr(dev, I2C_READ_BIT, 1) != 0) { i = __i2c_read(data, length); } - writeb(I2C_CR_MEN, &I2C->cr); + writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr); if (i == length) return 0; @@ -193,12 +216,12 @@ i2c_write(u8 dev, uint addr, int alen, u8 *data, int length) u8 *a = (u8*)&addr; if (i2c_wait4bus() >= 0 - && i2c_write_addr(dev, I2C_WRITE, 0) != 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->cr); + writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr); if (i == length) return 0; @@ -237,5 +260,34 @@ 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 */ |