X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=drivers%2Fi2c%2Fadi_i2c.c;h=c58f14a36e5217624f398c2cbb0ec540cb1c474c;hb=6bed24cc62ecd8d7a96c34cf1cf3e5e093f7be62;hp=743aa251a125d2482dc1cd728c9b871e53b15af7;hpb=86bdd70a09be7868df19983af27f3c18e96c610f;p=oweals%2Fu-boot.git diff --git a/drivers/i2c/adi_i2c.c b/drivers/i2c/adi_i2c.c index 743aa251a1..c58f14a36e 100644 --- a/drivers/i2c/adi_i2c.c +++ b/drivers/i2c/adi_i2c.c @@ -1,7 +1,7 @@ /* - * i2c.c - driver for Blackfin on-chip TWI/I2C + * i2c.c - driver for ADI TWI/I2C * - * Copyright (c) 2006-2010 Analog Devices Inc. + * Copyright (c) 2006-2014 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ @@ -11,6 +11,9 @@ #include #include +#include + +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; @@ -35,25 +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 volatile 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 /* @@ -69,11 +59,11 @@ static volatile 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 */ -struct i2c_msg { +struct adi_i2c_msg { u8 flags; #define I2C_M_COMBO 0x4 #define I2C_M_STOP 0x2 @@ -91,55 +81,52 @@ 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 adi_i2c_msg *msg) { - uint16_t int_stat; + u16 int_stat, ctl; ulong timebase = get_timer(0); do { - int_stat = twi->int_stat; + int_stat = readw(&twi->int_stat); if (int_stat & XMTSERV) { - debugi("processing XMTSERV"); - twi->int_stat = XMTSERV; - SSYNC(); + writew(XMTSERV, &twi->int_stat); if (msg->alen) { - twi->xmt_data8 = *(msg->abuf++); + writew(*(msg->abuf++), &twi->xmt_data8); --msg->alen; } else if (!(msg->flags & I2C_M_COMBO) && msg->len) { - twi->xmt_data8 = *(msg->buf++); + writew(*(msg->buf++), &twi->xmt_data8); --msg->len; } else { - twi->master_ctl |= (msg->flags & I2C_M_COMBO) ? RSTART | MDIR : STOP; - SSYNC(); + ctl = readw(&twi->master_ctl); + if (msg->flags & I2C_M_COMBO) + writew(ctl | RSTART | MDIR, + &twi->master_ctl); + else + writew(ctl | STOP, &twi->master_ctl); } } if (int_stat & RCVSERV) { - debugi("processing RCVSERV"); - twi->int_stat = RCVSERV; - SSYNC(); + writew(RCVSERV, &twi->int_stat); if (msg->len) { - *(msg->buf++) = twi->rcv_data8; + *(msg->buf++) = readw(&twi->rcv_data8); --msg->len; } else if (msg->flags & I2C_M_STOP) { - twi->master_ctl |= STOP; - SSYNC(); + ctl = readw(&twi->master_ctl); + writew(ctl | STOP, &twi->master_ctl); } } if (int_stat & MERR) { - debugi("processing MERR"); - twi->int_stat = MERR; - SSYNC(); + writew(MERR, &twi->int_stat); return msg->len; } if (int_stat & MCOMP) { - debugi("processing MCOMP"); - twi->int_stat = MCOMP; - SSYNC(); + writew(MCOMP, &twi->int_stat); if (msg->flags & I2C_M_COMBO && msg->len) { - twi->master_ctl = (twi->master_ctl & ~RSTART) | + ctl = readw(&twi->master_ctl); + ctl = (ctl & ~RSTART) | (min(msg->len, 0xff) << 6) | MEN | MDIR; - SSYNC(); + writew(ctl, &twi->master_ctl); } else break; } @@ -153,226 +140,166 @@ 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[] = { (addr >> 0), (addr >> 8), (addr >> 16), }; - struct i2c_msg msg = { + struct adi_i2c_msg msg = { .flags = flags | (len >= 0xff ? I2C_M_STOP : 0), .buf = buffer, .len = len, .abuf = addr_buffer, .alen = alen, }; - int ret; - - dmemset(buffer, 0xff, len); - debugi("chip=0x%x addr=0x%02x alen=%i buf[0]=0x%02x len=%i flags=0x%02x[%s] ", - chip, addr, alen, buffer[0], len, flags, (flags & I2C_M_READ ? "rd" : "wr")); /* wait for things to settle */ - while (twi->master_stat & BUSBUSY) + while (readw(&twi->master_stat) & BUSBUSY) if (ctrlc()) return 1; /* Set Transmit device address */ - twi->master_addr = chip; + writew(chip, &twi->master_addr); /* Clear the FIFO before starting things */ - twi->fifo_ctl = XMTFLUSH | RCVFLUSH; - SSYNC(); - twi->fifo_ctl = 0; - SSYNC(); + writew(XMTFLUSH | RCVFLUSH, &twi->fifo_ctl); + writew(0, &twi->fifo_ctl); /* prime the pump */ if (msg.alen) { len = (msg.flags & I2C_M_COMBO) ? msg.alen : msg.alen + len; - debugi("first byte=0x%02x", *msg.abuf); - twi->xmt_data8 = *(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); - twi->xmt_data8 = *(msg.buf++); + writew(*(msg.buf++), &twi->xmt_data8); --msg.len; } /* clear int stat */ - twi->master_stat = -1; - twi->int_stat = -1; - twi->int_mask = 0; - SSYNC(); + writew(-1, &twi->master_stat); + writew(-1, &twi->int_stat); + writew(0, &twi->int_mask); /* Master enable */ - twi->master_ctl = - (twi->master_ctl & FAST) | - (min(len, 0xff) << 6) | MEN | - ((msg.flags & I2C_M_READ) ? MDIR : 0); - SSYNC(); - debugi("CTL=0x%04x", twi->master_ctl); + ctl = readw(&twi->master_ctl); + ctl = (ctl & FAST) | (min(len, 0xff) << 6) | MEN | + ((msg.flags & I2C_M_READ) ? MDIR : 0); + 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) { - twi->master_ctl &= ~MEN; - twi->control &= ~TWI_ENA; - SSYNC(); - twi->control |= TWI_ENA; - SSYNC(); + ctl = readw(&twi->master_ctl) & ~MEN; + writew(ctl, &twi->master_ctl); + ctl = readw(&twi->control) & ~TWI_ENA; + writew(ctl, &twi->control); + ctl = readw(&twi->control) | TWI_ENA; + writew(ctl, &twi->control); } 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 */ if (clkdiv < I2C_DUTY_MAX || clkdiv > I2C_DUTY_MIN) return -1; - twi->clkdiv = (clkdiv << 8) | (clkdiv & 0xff); + clkdiv = (clkdiv << 8) | (clkdiv & 0xff); + writew(clkdiv, &twi->clkdiv); /* Don't turn it on */ - twi->master_ctl = (speed > 100000 ? FAST : 0); + writew(speed > 100000 ? FAST : 0, &twi->master_ctl); return 0; } -/** - * i2c_get_bus_speed - get i2c bus speed - * @speed: bus speed (in HZ) - */ -unsigned int i2c_get_bus_speed(void) -{ - /* 10 MHz / (2 * CLKDIV) -> 5 MHz / CLKDIV */ - return 5000000 / (twi->clkdiv & 0xff); -} - -/** - * 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 */ - twi->control = prescale; + writew(prescale, &twi->control); /* Set TWI interface clock as specified */ i2c_set_bus_speed(speed); /* Enable it */ - twi->control = TWI_ENA | prescale; - SSYNC(); - - debugi("CONTROL:0x%04x CLKDIV:0x%04x", twi->control, twi->clkdiv); - -#if CONFIG_SYS_I2C_SLAVE -# error I2C slave support not tested/supported - /* If they want us as a slave, do it */ - if (slaveaddr) { - twi->slave_addr = slaveaddr; - twi->slave_ctl = SEN; - } -#endif + writew(TWI_ENA | prescale, &twi->control); } -/** - * 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; + case 1: + return (struct twi_regs *)TWI1_CLKDIV; #endif -#if CONFIG_SYS_MAX_I2C_BUS > 2 - case 2: twi = (void *)TWI2_CLKDIV; return 0; -#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; - } -}