X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=cpu%2Fpxa%2Fi2c.c;h=722d949473f5a81bc3796bf682306665d48303f9;hb=71d67f43dabe8dd8adbe594b6c61944a2d106efa;hp=406f825cd50b0ef28038611fec06b7e56b643b51;hpb=4c3b21a5f915988e3d9681cf9cb566bb7bd56859;p=oweals%2Fu-boot.git diff --git a/cpu/pxa/i2c.c b/cpu/pxa/i2c.c index 406f825cd5..722d949473 100644 --- a/cpu/pxa/i2c.c +++ b/cpu/pxa/i2c.c @@ -36,18 +36,24 @@ #ifdef CONFIG_HARD_I2C -/* - * - CFG_I2C_SPEED - * - I2C_PXA_SLAVE_ADDR +/* + * - CFG_I2C_SPEED + * - I2C_PXA_SLAVE_ADDR */ #include #include #include -//#define DEBUG_I2C 1 /* activate local debugging output */ +/*#define DEBUG_I2C 1 /###* activate local debugging output */ #define I2C_PXA_SLAVE_ADDR 0x1 /* slave pxa unit address */ -#define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE) + +#if (CFG_I2C_SPEED == 400000) +#define I2C_ICR_INIT (ICR_FM | ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE) +#else +#define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE) +#endif + #define I2C_ISR_INIT 0x7FF #ifdef DEBUG_I2C @@ -63,7 +69,7 @@ #define I2C_COND_STOP 2 /* Shall the current transfer be ack/nacked or being waited for it? */ -#define I2C_ACKNAK_WAITACK 1 +#define I2C_ACKNAK_WAITACK 1 #define I2C_ACKNAK_SENDACK 2 #define I2C_ACKNAK_SENDNAK 4 @@ -74,39 +80,42 @@ /* All transfers are described by this data structure */ struct i2c_msg { u8 condition; - u8 acknack; - u8 direction; + u8 acknack; + u8 direction; u8 data; }; /** - * i2c_pxa_reset: - reset the host controller + * i2c_pxa_reset: - reset the host controller * */ static void i2c_reset( void ) { ICR &= ~ICR_IUE; /* disable unit */ - ICR |= ICR_UR; /* reset the unit */ - udelay(100); - ICR &= ~ICR_IUE; /* disable unit */ - CKEN |= CKEN14_I2C; /* set the global I2C clock on */ - ISAR = I2C_PXA_SLAVE_ADDR; /* set our slave address */ - ICR = I2C_ICR_INIT; /* set control register values */ - ISR = I2C_ISR_INIT; /* set clear interrupt bits */ - ICR |= ICR_IUE; /* enable unit */ - udelay(100); + ICR |= ICR_UR; /* reset the unit */ + udelay(100); + ICR &= ~ICR_IUE; /* disable unit */ +#ifdef CONFIG_CPU_MONAHANS + CKENB |= (CKENB_4_I2C); /* | CKENB_1_PWM1 | CKENB_0_PWM0); */ +#else /* CONFIG_CPU_MONAHANS */ + CKEN |= CKEN14_I2C; /* set the global I2C clock on */ +#endif + ISAR = I2C_PXA_SLAVE_ADDR; /* set our slave address */ + ICR = I2C_ICR_INIT; /* set control register values */ + ISR = I2C_ISR_INIT; /* set clear interrupt bits */ + ICR |= ICR_IUE; /* enable unit */ + udelay(100); } /** - * i2c_isr_set_cleared: - wait until certain bits of the I2C status register + * i2c_isr_set_cleared: - wait until certain bits of the I2C status register * are set and cleared * - * @return: 0 in case of success, 1 means timeout (no match within 10 ms). + * @return: 1 in case of success, 0 means timeout (no match within 10 ms). */ - static int i2c_isr_set_cleared( unsigned long set_mask, unsigned long cleared_mask ) { int timeout = 10000; @@ -116,15 +125,15 @@ static int i2c_isr_set_cleared( unsigned long set_mask, unsigned long cleared_ma if( timeout-- < 0 ) return 0; } - return 1; + return 1; } /** * i2c_transfer: - Transfer one byte over the i2c bus * - * This function can tranfer a byte over the i2c bus in both directions. - * It is used by the public API functions. + * This function can tranfer a byte over the i2c bus in both directions. + * It is used by the public API functions. * * @return: 0: transfer successful * -1: message is empty @@ -133,12 +142,12 @@ static int i2c_isr_set_cleared( unsigned long set_mask, unsigned long cleared_ma * -4: receive timeout * -5: illegal parameters * -6: bus is busy and couldn't be aquired - */ + */ int i2c_transfer(struct i2c_msg *msg) { int ret; - if (!msg) + if (!msg) goto transfer_error_msg_empty; switch(msg->direction) { @@ -154,14 +163,14 @@ int i2c_transfer(struct i2c_msg *msg) ICR &= ~ICR_STOP; IDBR = msg->data; if (msg->condition == I2C_COND_START) ICR |= ICR_START; - if (msg->condition == I2C_COND_STOP) ICR |= ICR_STOP; + if (msg->condition == I2C_COND_STOP) ICR |= ICR_STOP; if (msg->acknack == I2C_ACKNAK_SENDNAK) ICR |= ICR_ACKNAK; if (msg->acknack == I2C_ACKNAK_SENDACK) ICR &= ~ICR_ACKNAK; ICR &= ~ICR_ALDIE; - ICR |= ICR_TB; + ICR |= ICR_TB; /* transmit register empty? */ - if (!i2c_isr_set_cleared(ISR_ITE,0)) + if (!i2c_isr_set_cleared(ISR_ITE,0)) goto transfer_error_transmit_timeout; /* clear 'transmit empty' state */ @@ -169,7 +178,7 @@ int i2c_transfer(struct i2c_msg *msg) /* wait for ACK from slave */ if (msg->acknack == I2C_ACKNAK_WAITACK) - if (!i2c_isr_set_cleared(0,ISR_ACKNAK)) + if (!i2c_isr_set_cleared(0,ISR_ACKNAK)) goto transfer_error_ack_missing; break; @@ -190,8 +199,8 @@ int i2c_transfer(struct i2c_msg *msg) ICR |= ICR_TB; /* receive register full? */ - if (!i2c_isr_set_cleared(ISR_IRF,0)) - goto transfer_error_receive_timeout; + if (!i2c_isr_set_cleared(ISR_IRF,0)) + goto transfer_error_receive_timeout; msg->data = IDBR; @@ -206,9 +215,9 @@ int i2c_transfer(struct i2c_msg *msg) } - return 0; + return 0; -transfer_error_msg_empty: +transfer_error_msg_empty: PRINTD(("i2c_transfer: error: 'msg' is empty\n")); ret = -1; goto i2c_transfer_finish; @@ -245,7 +254,7 @@ i2c_transfer_finish: void i2c_init(int speed, int slaveaddr) { -#ifdef CFG_I2C_INIT_BOARD +#ifdef CFG_I2C_INIT_BOARD /* call board specific i2c bus reset routine before accessing the */ /* environment, which might be in a chip on that bus. For details */ /* about this problem see doc/I2C_Edge_Conditions. */ @@ -257,7 +266,7 @@ void i2c_init(int speed, int slaveaddr) /** * i2c_probe: - Test if a chip answers for a given i2c address * - * @chip: address of the chip which is searched for + * @chip: address of the chip which is searched for * @return: 0 if a chip was found, -1 otherwhise */ @@ -287,7 +296,7 @@ int i2c_probe(uchar chip) * i2c_read: - Read multiple bytes from an i2c device * * The higher level routines take into account that this function is only - * called with len < page length of the device (see configuration file) + * called with len < page length of the device (see configuration file) * * @chip: address of the chip which is to be read * @addr: i2c data address within the chip @@ -315,12 +324,12 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) msg.data = (chip << 1); msg.data &= 0xFE; if ((ret=i2c_transfer(&msg))) return -1; - + /* - * send memory address bytes; - * alen defines how much bytes we have to send. + * send memory address bytes; + * alen defines how much bytes we have to send. */ - //addr &= ((1 << CFG_EEPROM_PAGE_WRITE_BITS)-1); + /*addr &= ((1 << CFG_EEPROM_PAGE_WRITE_BITS)-1); */ addr_bytes[0] = (u8)((addr >> 0) & 0x000000FF); addr_bytes[1] = (u8)((addr >> 8) & 0x000000FF); addr_bytes[2] = (u8)((addr >> 16) & 0x000000FF); @@ -334,7 +343,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) msg.data = addr_bytes[alen]; if ((ret=i2c_transfer(&msg))) return -1; } - + /* start read sequence */ PRINTD(("i2c_read: start read sequence\n")); @@ -348,7 +357,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) /* read bytes; send NACK at last byte */ while (len--) { - if (len==0) { + if (len==0) { msg.condition = I2C_COND_STOP; msg.acknack = I2C_ACKNAK_SENDNAK; } else { @@ -360,9 +369,9 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) msg.data = 0x00; if ((ret=i2c_transfer(&msg))) return -1; - *(buffer++) = msg.data; - + *buffer = msg.data; PRINTD(("i2c_read: reading byte (0x%08x)=0x%02x\n",(unsigned int)buffer,*buffer)); + buffer++; } @@ -376,12 +385,12 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) * i2c_write: - Write multiple bytes to an i2c device * * The higher level routines take into account that this function is only - * called with len < page length of the device (see configuration file) + * called with len < page length of the device (see configuration file) * * @chip: address of the chip which is to be written * @addr: i2c data address within the chip * @alen: length of the i2c data address (1..2 bytes) - * @buffer: where to find the data to be written + * @buffer: where to find the data to be written * @len: how much byte do we want to read * @return: 0 in case of success */ @@ -403,10 +412,10 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) msg.data = (chip << 1); msg.data &= 0xFE; if (i2c_transfer(&msg)) return -1; - + /* - * send memory address bytes; - * alen defines how much bytes we have to send. + * send memory address bytes; + * alen defines how much bytes we have to send. */ addr_bytes[0] = (u8)((addr >> 0) & 0x000000FF); addr_bytes[1] = (u8)((addr >> 8) & 0x000000FF); @@ -421,13 +430,13 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) msg.data = addr_bytes[alen]; if (i2c_transfer(&msg)) return -1; } - + /* write bytes; send NACK at last byte */ while (len--) { PRINTD(("i2c_write: writing byte (0x%08x)=0x%02x\n",(unsigned int)buffer,*buffer)); - if (len==0) + if (len==0) msg.condition = I2C_COND_STOP; else msg.condition = I2C_COND_NORMAL; @@ -435,7 +444,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) msg.acknack = I2C_ACKNAK_WAITACK; msg.direction = I2C_WRITE; msg.data = *(buffer++); - + if (i2c_transfer(&msg)) return -1; } @@ -448,13 +457,17 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) uchar i2c_reg_read (uchar chip, uchar reg) { + char buf; + PRINTD(("i2c_reg_read(chip=0x%02x, reg=0x%02x)\n",chip,reg)); - return 0; + i2c_read(chip, reg, 1, &buf, 1); + return (buf); } void i2c_reg_write(uchar chip, uchar reg, uchar val) { PRINTD(("i2c_reg_write(chip=0x%02x, reg=0x%02x, val=0x%02x)\n",chip,reg,val)); + i2c_write(chip, reg, 1, &val, 1); } #endif /* CONFIG_HARD_I2C */