hal_i2c.h

ucos 在arca方舟芯片（mips）上的移植。

//--------------------------------------------------------------------------
// I2C bus registers
#define UCOS_REG_I2CDR        0xE0000800   /* 8bit acess data*/
#define UCOS_REG_I2CCR        0xE0000804   /* 8bit acess control*/
#define UCOS_REG_I2CSR        0xE0000808   /* 8bit acess status*/
#define UCOS_REG_I2CGR        0xE000080c   /* 16bit acess clock*/

#define I2CCR_ENABLE            0x01
#define I2CCR_ACK               0x02
#define I2CCR_STOP              0x04
#define I2CCR_START             0x08
#define I2CCR_IEN               0x10

#define I2CSR_ACKF              0x01
#define I2CSR_DRF               0x02
#define I2CSR_TEND              0x04
#define I2CSR_BUSY              0x08

#define I2C_WRITE               0
#define I2C_READ                1

#define ERR_NODEV               1
#define ERR_TIMEOUT             2

#define SPD_DEV                 0x50	//0b01010000
#define SPD_DEV2                0x51	//0b01010001
#define HCI_DEV                 0x57	//0b01010111
#define RTC_DEV                 0x68	//0b01101000

/* SPD */
#define SPD_DRAM_ROW		3
#define SPD_DRAM_COL		4
#define SPD_DRAM_CHIP		5
#define SPD_DRAM_REFRESH_RATE	12 /* Define it by us */
#define SPD_DRAM_MB_LEN		16
#define SPD_DRAM_BANK		17
#define SPD_DRAM_CAS_LATENCY	18 /* CAS_LATENCY */
#define SPD_DRAM_TRWL   	20 /* Write precharge time
				    * Write Latency */
#define SPD_DRAM_TPC    	27 /* RAS precharge time
				    * Min Row Precharge Time TRP */
#define SPD_DRAM_RRD    	28 /* Min Row active to Row active TRRD*/
#define SPD_DRAM_RCD		29 /* RCD RAS-CAS delay */
#define SPD_DRAM_TRAS   	30 /* TRAS RAS asserte time */
#define SPD_DRAM_DENSITY	31 /* Density of each row */

/* HCI */

#define HCI_CHIP_2BUS_WIDTH	11 /* bit7--4:0:8byte 1:16byte 2:32byte */
#define HCI_CHIP_2FLASH_ADDR	14 /* bit7--0:A31--A24 */
#define HCI_CHIP_3BUS_WIDTH	147 /* bit7--4:0:8byte 1:16byte 2:32byte */
#define HCI_CHIP_3FLASH_ADDR	150 /* bit7--0:A31--A24 */
#define HCI_CHIP_TYPE		16 /* 0:DIMM 1:SODIMM 2:chip */
#define HCI_CHIP_CHIP		29 /* Chip Location:CS */
#define HCI_CHIP_ROW		17
#define HCI_CHIP_COL		18
#define HCI_CHIP_BANK		19
#define HCI_CHIP_TRAS   	20 /* RAS pulse width:TRAS */
#define HCI_CHIP_RCD		21 /* min RAS-CAS delay:RCD */
#define HCI_CHIP_TPC    	22 /* Min RAS Precharge Time:TPC */
#define HCI_CHIP_TRWL   	23 /* Write Latency:TRWL */
#define HCI_CHIP_RRD    	24 /* Min RAS cycle time:TRRD*/
#define HCI_CHIP_CAS_LATENCY	25 /* CAS latency:TCL */
#define HCI_CHIP_REFRESH_RATE	27 
#define HCI_CHIP_MB_LEN		28 /* burst length */
#define HCI_CHIP_SIZE		30 /* memory size */
#define HCI_CHIP_VERSION	120 /* version */
#define HCI_CHIP_MAC		64 /*  mac address,used 6 byte */
#define HCI_VERSION_NULL	0xffffffff


#if !defined(__ASSEMBLE__)

#define I2CGR_VALUE 63	/* 80M / (16 * 80K(BautRate)) - 1 */

#define REG16(addr)     (*((unsigned short volatile *)(addr)))
#define REG8(addr)      (*((unsigned char  volatile *)(addr)))

#define i2c_start()				\
do {						\
    REG8(UCOS_REG_I2CCR) |= I2CCR_START;	\
} while (0)

#define i2c_stop()				\
do {						\
    REG8(UCOS_REG_I2CCR) |= I2CCR_STOP;	\
} while (0)

#define i2c_stop2()				\
do {						\
    REG8(UCOS_REG_I2CCR) &= ~I2CCR_ENABLE;	\
    REG8(UCOS_REG_I2CCR) |= I2CCR_ENABLE;	\
} while (0)

#define i2c_enable()				\
do {						\
    REG8(UCOS_REG_I2CCR) |= I2CCR_ENABLE;	\
} while (0)

#define i2c_disable()				\
do {						\
    REG8(UCOS_REG_I2CCR) &= ~I2CCR_ENABLE;	\
} while (0)

#define i2c_set_ack()				\
do {						\
    REG8(UCOS_REG_I2CCR) &= ~I2CCR_ACK;	\
} while (0)

#define i2c_set_nack()				\
do {						\
    REG8(UCOS_REG_I2CCR) |= I2CCR_ACK;	\
} while (0)

#define i2c_set_drf()				\
do {						\
    REG8(UCOS_REG_I2CSR) |= I2CSR_DRF;	\
} while (0)

#define i2c_clear_drf()				\
do {						\
    REG8(UCOS_REG_I2CSR) &= ~I2CSR_DRF;	\
} while (0)

#define i2c_check_ack() (!(REG8(UCOS_REG_I2CSR) & I2CSR_ACKF))

#define i2c_check_transmit_end() (REG8(UCOS_REG_I2CSR) & I2CSR_TEND)

#define i2c_check_drf() (REG8(UCOS_REG_I2CSR) & I2CSR_DRF)

#define i2c_read() REG8(UCOS_REG_I2CDR)

#define i2c_write(val)				\
do {						\
    REG8(UCOS_REG_I2CDR) = (val);		\
} while (0);

#define i2c_set_clock()				\
do {						\
    REG16(UCOS_REG_I2CGR) = I2CGR_VALUE;	\
} while (0);

#endif