diff options
Diffstat (limited to 'drivers/i2c/adi_i2c.c')
| -rw-r--r-- | drivers/i2c/adi_i2c.c | 202 |
1 files changed, 60 insertions, 142 deletions
diff --git a/drivers/i2c/adi_i2c.c b/drivers/i2c/adi_i2c.c index 71077c5..20495b1 100644 --- a/drivers/i2c/adi_i2c.c +++ b/drivers/i2c/adi_i2c.c @@ -13,6 +13,8 @@ #include <asm/twi.h> #include <asm/io.h> +static struct twi_regs *i2c_get_base(struct i2c_adapter *adap); + /* Every register is 32bit aligned, but only 16bits in size */ #define ureg(name) u16 name; u16 __pad_##name; struct twi_regs { @@ -36,25 +38,12 @@ struct twi_regs { }; #undef ureg -/* U-Boot I2C framework allows only one active device at a time. */ #ifdef TWI_CLKDIV #define TWI0_CLKDIV TWI_CLKDIV -#endif -static struct twi_regs *twi = (void *)TWI0_CLKDIV; - -#ifdef DEBUG -# define dmemset(s, c, n) memset(s, c, n) -#else -# define dmemset(s, c, n) -#endif -#define debugi(fmt, args...) \ - debug( \ - "MSTAT:0x%03x FSTAT:0x%x ISTAT:0x%02x\t%-20s:%-3i: " fmt "\n", \ - twi->master_stat, twi->fifo_stat, twi->int_stat, \ - __func__, __LINE__, ## args) - -#ifdef CONFIG_TWICLK_KHZ -# error do not define CONFIG_TWICLK_KHZ ... use CONFIG_SYS_I2C_SPEED +# ifdef CONFIG_SYS_MAX_I2C_BUS +# undef CONFIG_SYS_MAX_I2C_BUS +# endif +#define CONFIG_SYS_MAX_I2C_BUS 1 #endif /* @@ -70,7 +59,7 @@ static struct twi_regs *twi = (void *)TWI0_CLKDIV; #define SYS_I2C_DUTY I2C_SPEED_TO_DUTY(CONFIG_SYS_I2C_SPEED) /* Note: duty is inverse of speed, so the comparisons below are correct */ #if SYS_I2C_DUTY < I2C_DUTY_MAX || SYS_I2C_DUTY > I2C_DUTY_MIN -# error "The Blackfin I2C hardware can only operate 20KHz - 400KHz" +# error "The I2C hardware can only operate 20KHz - 400KHz" #endif /* All transfers are described by this data structure */ @@ -92,7 +81,7 @@ struct i2c_msg { * wait_for_completion - manage the actual i2c transfer * @msg: the i2c msg */ -static int wait_for_completion(struct i2c_msg *msg) +static int wait_for_completion(struct twi_regs *twi, struct i2c_msg *msg) { u16 int_stat, ctl; ulong timebase = get_timer(0); @@ -101,7 +90,6 @@ static int wait_for_completion(struct i2c_msg *msg) int_stat = readw(&twi->int_stat); if (int_stat & XMTSERV) { - debugi("processing XMTSERV"); writew(XMTSERV, &twi->int_stat); if (msg->alen) { writew(*(msg->abuf++), &twi->xmt_data8); @@ -119,7 +107,6 @@ static int wait_for_completion(struct i2c_msg *msg) } } if (int_stat & RCVSERV) { - debugi("processing RCVSERV"); writew(RCVSERV, &twi->int_stat); if (msg->len) { *(msg->buf++) = readw(&twi->rcv_data8); @@ -130,12 +117,10 @@ static int wait_for_completion(struct i2c_msg *msg) } } if (int_stat & MERR) { - debugi("processing MERR"); writew(MERR, &twi->int_stat); return msg->len; } if (int_stat & MCOMP) { - debugi("processing MCOMP"); writew(MCOMP, &twi->int_stat); if (msg->flags & I2C_M_COMBO && msg->len) { ctl = readw(&twi->master_ctl); @@ -155,16 +140,10 @@ static int wait_for_completion(struct i2c_msg *msg) return msg->len; } -/** - * i2c_transfer - setup an i2c transfer - * @return: 0 if things worked, non-0 if things failed - * - * Here we just get the i2c stuff all prepped and ready, and then tail off - * into wait_for_completion() for all the bits to go. - */ -static int i2c_transfer(uchar chip, uint addr, int alen, uchar *buffer, - int len, u8 flags) +static int i2c_transfer(struct i2c_adapter *adap, uint8_t chip, uint addr, + int alen, uint8_t *buffer, int len, uint8_t flags) { + struct twi_regs *twi = i2c_get_base(adap); int ret; u16 ctl; uchar addr_buffer[] = { @@ -180,12 +159,6 @@ static int i2c_transfer(uchar chip, uint addr, int alen, uchar *buffer, .alen = alen, }; - dmemset(buffer, 0xff, len); - debugi("chip=0x%x addr=0x%02x alen=%i buf[0]=0x%02x len=%i ", - chip, addr, alen, buffer[0], len); - debugi("flags=0x%02x[%s] ", flags, - (flags & I2C_M_READ ? "rd" : "wr")); - /* wait for things to settle */ while (readw(&twi->master_stat) & BUSBUSY) if (ctrlc()) @@ -201,11 +174,9 @@ static int i2c_transfer(uchar chip, uint addr, int alen, uchar *buffer, /* prime the pump */ if (msg.alen) { len = (msg.flags & I2C_M_COMBO) ? msg.alen : msg.alen + len; - debugi("first byte=0x%02x", *msg.abuf); writew(*(msg.abuf++), &twi->xmt_data8); --msg.alen; } else if (!(msg.flags & I2C_M_READ) && msg.len) { - debugi("first byte=0x%02x", *msg.buf); writew(*(msg.buf++), &twi->xmt_data8); --msg.len; } @@ -222,8 +193,7 @@ static int i2c_transfer(uchar chip, uint addr, int alen, uchar *buffer, writew(ctl, &twi->master_ctl); /* process the rest */ - ret = wait_for_completion(&msg); - debugi("ret=%d", ret); + ret = wait_for_completion(twi, &msg); if (ret) { ctl = readw(&twi->master_ctl) & ~MEN; @@ -237,12 +207,9 @@ static int i2c_transfer(uchar chip, uint addr, int alen, uchar *buffer, return ret; } -/** - * i2c_set_bus_speed - set i2c bus speed - * @speed: bus speed (in HZ) - */ -int i2c_set_bus_speed(unsigned int speed) +static uint adi_i2c_setspeed(struct i2c_adapter *adap, uint speed) { + struct twi_regs *twi = i2c_get_base(adap); u16 clkdiv = I2C_SPEED_TO_DUTY(speed); /* Set TWI interface clock */ @@ -257,28 +224,10 @@ int i2c_set_bus_speed(unsigned int speed) return 0; } -/** - * i2c_get_bus_speed - get i2c bus speed - * @speed: bus speed (in HZ) - */ -unsigned int i2c_get_bus_speed(void) -{ - u16 clkdiv = readw(&twi->clkdiv) & 0xff; - /* 10 MHz / (2 * CLKDIV) -> 5 MHz / CLKDIV */ - return 5000000 / clkdiv; -} - -/** - * i2c_init - initialize the i2c bus - * @speed: bus speed (in HZ) - * @slaveaddr: address of device in slave mode (0 - not slave) - * - * Slave mode isn't actually implemented. It'll stay that way until - * we get a real request for it. - */ -void i2c_init(int speed, int slaveaddr) +static void adi_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) { - uint8_t prescale = ((get_i2c_clk() / 1000 / 1000 + 5) / 10) & 0x7F; + struct twi_regs *twi = i2c_get_base(adap); + u16 prescale = ((get_i2c_clk() / 1000 / 1000 + 5) / 10) & 0x7F; /* Set TWI internal clock as 10MHz */ writew(prescale, &twi->control); @@ -288,100 +237,69 @@ void i2c_init(int speed, int slaveaddr) /* Enable it */ writew(TWI_ENA | prescale, &twi->control); - - debugi("CONTROL:0x%04x CLKDIV:0x%04x", readw(&twi->control), - readw(&twi->clkdiv)); - -#if CONFIG_SYS_I2C_SLAVE -# error I2C slave support not tested/supported -#endif } -/** - * i2c_probe - test if a chip exists at a given i2c address - * @chip: i2c chip addr to search for - * @return: 0 if found, non-0 if not found - */ -int i2c_probe(uchar chip) +static int adi_i2c_read(struct i2c_adapter *adap, uint8_t chip, + uint addr, int alen, uint8_t *buffer, int len) { - u8 byte; - return i2c_read(chip, 0, 0, &byte, 1); + return i2c_transfer(adap, chip, addr, alen, buffer, + len, alen ? I2C_M_COMBO : I2C_M_READ); } -/** - * i2c_read - read data from an i2c device - * @chip: i2c chip addr - * @addr: memory (register) address in the chip - * @alen: byte size of address - * @buffer: buffer to store data read from chip - * @len: how many bytes to read - * @return: 0 on success, non-0 on failure - */ -int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) +static int adi_i2c_write(struct i2c_adapter *adap, uint8_t chip, + uint addr, int alen, uint8_t *buffer, int len) { - return i2c_transfer(chip, addr, alen, buffer, - len, (alen ? I2C_M_COMBO : I2C_M_READ)); + return i2c_transfer(adap, chip, addr, alen, buffer, len, 0); } -/** - * i2c_write - write data to an i2c device - * @chip: i2c chip addr - * @addr: memory (register) address in the chip - * @alen: byte size of address - * @buffer: buffer holding data to write to chip - * @len: how many bytes to write - * @return: 0 on success, non-0 on failure - */ -int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) +static int adi_i2c_probe(struct i2c_adapter *adap, uint8_t chip) { - return i2c_transfer(chip, addr, alen, buffer, len, 0); + u8 byte; + return adi_i2c_read(adap, chip, 0, 0, &byte, 1); } -/** - * i2c_set_bus_num - change active I2C bus - * @bus: bus index, zero based - * @returns: 0 on success, non-0 on failure - */ -int i2c_set_bus_num(unsigned int bus) +static struct twi_regs *i2c_get_base(struct i2c_adapter *adap) { - switch (bus) { -#if CONFIG_SYS_MAX_I2C_BUS > 0 - case 0: - twi = (void *)TWI0_CLKDIV; - return 0; + switch (adap->hwadapnr) { +#if CONFIG_SYS_MAX_I2C_BUS > 2 + case 2: + return (struct twi_regs *)TWI2_CLKDIV; #endif #if CONFIG_SYS_MAX_I2C_BUS > 1 case 1: - twi = (void *)TWI1_CLKDIV; - return 0; -#endif -#if CONFIG_SYS_MAX_I2C_BUS > 2 - case 2: - twi = (void *)TWI2_CLKDIV; - return 0; + return (struct twi_regs *)TWI1_CLKDIV; #endif - default: return -1; + case 0: + return (struct twi_regs *)TWI0_CLKDIV; + + default: + printf("wrong hwadapnr: %d\n", adap->hwadapnr); } + + return NULL; } -/** - * i2c_get_bus_num - returns index of active I2C bus - */ -unsigned int i2c_get_bus_num(void) -{ - switch ((unsigned long)twi) { -#if CONFIG_SYS_MAX_I2C_BUS > 0 - case TWI0_CLKDIV: - return 0; -#endif +U_BOOT_I2C_ADAP_COMPLETE(adi_i2c0, adi_i2c_init, adi_i2c_probe, + adi_i2c_read, adi_i2c_write, + adi_i2c_setspeed, + CONFIG_SYS_I2C_SPEED, + 0, + 0) + #if CONFIG_SYS_MAX_I2C_BUS > 1 - case TWI1_CLKDIV: - return 1; +U_BOOT_I2C_ADAP_COMPLETE(adi_i2c1, adi_i2c_init, adi_i2c_probe, + adi_i2c_read, adi_i2c_write, + adi_i2c_setspeed, + CONFIG_SYS_I2C_SPEED, + 0, + 1) #endif + #if CONFIG_SYS_MAX_I2C_BUS > 2 - case TWI2_CLKDIV: - return 2; +U_BOOT_I2C_ADAP_COMPLETE(adi_i2c2, adi_i2c_init, adi_i2c_probe, + adi_i2c_read, adi_i2c_write, + adi_i2c_setspeed, + CONFIG_SYS_I2C_SPEED, + 0, + 2) #endif - default: return -1; - } -} |