diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/beagle/include/i2c.h')
| -rw-r--r-- | c/src/lib/libbsp/arm/beagle/include/i2c.h | 304 |
1 files changed, 164 insertions, 140 deletions
diff --git a/c/src/lib/libbsp/arm/beagle/include/i2c.h b/c/src/lib/libbsp/arm/beagle/include/i2c.h index 010fcee09c..3ada3c4b0d 100644 --- a/c/src/lib/libbsp/arm/beagle/include/i2c.h +++ b/c/src/lib/libbsp/arm/beagle/include/i2c.h @@ -24,7 +24,7 @@ #define LIBBSP_ARM_BEAGLE_I2C_H #include <rtems.h> - +#include <dev/i2c/i2c.h> #include <bsp.h> #ifdef __cplusplus @@ -34,151 +34,175 @@ extern "C" { /* I2C Configuration Register (I2C_CON): */ -#define I2C_CON_EN (1 << 15) /* I2C module enable */ -#define I2C_CON_BE (1 << 14) /* Big endian mode */ -#define I2C_CON_STB (1 << 11) /* Start byte mode (master mode only) */ -#define I2C_CON_MST (1 << 10) /* Master/slave mode */ -#define I2C_CON_TRX (1 << 9) /* Transmitter/receiver mode */ +#define BBB_I2C_CON_EN (1 << 15) /* I2C module enable */ +#define BBB_I2C_CON_BE (1 << 14) /* Big endian mode */ +#define BBB_I2C_CON_STB (1 << 11) /* Start byte mode (master mode only) */ +#define BBB_I2C_CON_MST (1 << 10) /* Master/slave mode */ +#define BBB_I2C_CON_TRX (1 << 9) /* Transmitter/receiver mode */ /* (master mode only) */ -#define I2C_CON_XA (1 << 8) /* Expand address */ -#define I2C_CON_STP (1 << 1) /* Stop condition (master mode only) */ -#define I2C_CON_STT (1 << 0) /* Start condition (master mode only) */ - +#define BBB_I2C_CON_XA (1 << 8) /* Expand address */ +#define BBB_I2C_CON_STP (1 << 1) /* Stop condition (master mode only) */ +#define BBB_I2C_CON_STT (1 << 0) /* Start condition (master mode only) */ +#define BBB_I2C_CON_CLR 0x0 /* Clear configuration register */ /* I2C Status Register (I2C_STAT): */ -#define I2C_STAT_SBD (1 << 15) /* Single byte data */ -#define I2C_STAT_BB (1 << 12) /* Bus busy */ -#define I2C_STAT_ROVR (1 << 11) /* Receive overrun */ -#define I2C_STAT_XUDF (1 << 10) /* Transmit underflow */ -#define I2C_STAT_AAS (1 << 9) /* Address as slave */ -#define I2C_STAT_GC (1 << 5) -#define I2C_STAT_XRDY (1 << 4) /* Transmit data ready */ -#define I2C_STAT_RRDY (1 << 3) /* Receive data ready */ -#define I2C_STAT_ARDY (1 << 2) /* Register access ready */ -#define I2C_STAT_NACK (1 << 1) /* No acknowledgment interrupt enable */ -#define I2C_STAT_AL (1 << 0) /* Arbitration lost interrupt enable */ +#define BBB_I2C_STAT_SBD (1 << 15) /* Single byte data */ +#define BBB_I2C_STAT_BB (1 << 12) /* Bus busy */ +#define BBB_I2C_STAT_ROVR (1 << 11) /* Receive overrun */ +#define BBB_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */ +#define BBB_I2C_STAT_AAS (1 << 9) /* Address as slave */ +#define BBB_I2C_STAT_GC (1 << 5) +#define BBB_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */ +#define BBB_I2C_STAT_RRDY (1 << 3) /* Receive data ready */ +#define BBB_I2C_STAT_ARDY (1 << 2) /* Register access ready */ +#define BBB_I2C_STAT_NACK (1 << 1) /* No acknowledgment interrupt enable */ +#define BBB_I2C_STAT_AL (1 << 0) /* Arbitration lost interrupt enable */ /* I2C Interrupt Enable Register (I2C_IE): */ -#define I2C_IE_GC_IE (1 << 5) -#define I2C_IE_XRDY_IE (1 << 4) /* Transmit data ready interrupt enable */ -#define I2C_IE_RRDY_IE (1 << 3) /* Receive data ready interrupt enable */ -#define I2C_IE_ARDY_IE (1 << 2) /* Register access ready interrupt enable */ -#define I2C_IE_NACK_IE (1 << 1) /* No acknowledgment interrupt enable */ -#define I2C_IE_AL_IE (1 << 0) /* Arbitration lost interrupt enable */ -/* - * The equation for the low and high time is - * tlow = scll + scll_trim = (sampling clock * tlow_duty) / speed - * thigh = sclh + sclh_trim = (sampling clock * (1 - tlow_duty)) / speed - * - * If the duty cycle is 50% - * - * tlow = scll + scll_trim = sampling clock / (2 * speed) - * thigh = sclh + sclh_trim = sampling clock / (2 * speed) - * - * In TRM - * scll_trim = 7 - * sclh_trim = 5 - * - * The linux 2.6.30 kernel uses - * scll_trim = 6 - * sclh_trim = 6 - * - * These are the trim values for standard and fast speed - */ -#ifndef I2C_FASTSPEED_SCLL_TRIM -#define I2C_FASTSPEED_SCLL_TRIM 6 -#endif -#ifndef I2C_FASTSPEED_SCLH_TRIM -#define I2C_FASTSPEED_SCLH_TRIM 6 -#endif - -/* These are the trim values for high speed */ -#ifndef I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM -#define I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM I2C_FASTSPEED_SCLL_TRIM -#endif -#ifndef I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM -#define I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM I2C_FASTSPEED_SCLH_TRIM -#endif -#ifndef I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM -#define I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM I2C_FASTSPEED_SCLL_TRIM -#endif -#ifndef I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM -#define I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM I2C_FASTSPEED_SCLH_TRIM -#endif - -#define OMAP_I2C_STANDARD 100000 -#define OMAP_I2C_FAST_MODE 400000 -#define OMAP_I2C_HIGH_SPEED 3400000 - - -/* Use the reference value of 96MHz if not explicitly set by the board */ -#ifndef I2C_IP_CLK -#define I2C_IP_CLK SYSTEM_CLOCK_96 -#endif +#define BBB_I2C_IE_GC_IE (1 << 5) +#define BBB_I2C_IE_XRDY_IE (1 << 4) /* Transmit data ready interrupt enable */ +#define BBB_I2C_IE_RRDY_IE (1 << 3) /* Receive data ready interrupt enable */ +#define BBB_I2C_IE_ARDY_IE (1 << 2) /* Register access ready interrupt enable */ +#define BBB_I2C_IE_NACK_IE (1 << 1) /* No acknowledgment interrupt enable */ +#define BBB_I2C_IE_AL_IE (1 << 0) /* Arbitration lost interrupt enable */ + +/* I2C SYSC Register (I2C_SYSC): */ +#define BBB_I2C_SYSC_SRST (1 << 1) + +#define BBB_I2C_TIMEOUT 1000 + +#define BBB_I2C_SYSS_RDONE (1 << 0) /* Internel reset monitoring */ + +#define BBB_CONFIG_SYS_I2C_SPEED 100000 +#define BBB_CONFIG_SYS_I2C_SLAVE 1 +#define BBB_I2C_ALL_FLAGS 0x7FFF +#define BBB_I2C_ALL_IRQ_FLAGS 0xFFFF + +#define BBB_I2C_SYSCLK 48000000 +#define BBB_I2C_INTERNAL_CLK 12000000 +#define BBB_I2C_SPEED_CLK 100000 + +#define BBB_I2C_IRQ_ERROR \ + ( AM335X_I2C_IRQSTATUS_NACK \ + | AM335X_I2C_IRQSTATUS_ROVR \ + | AM335X_I2C_IRQSTATUS_AL \ + | AM335X_I2C_IRQSTATUS_ARDY \ + | AM335X_I2C_IRQSTATUS_RRDY \ + | AM335X_I2C_IRQSTATUS_XRDY \ + | AM335X_I2C_IRQSTATUS_XUDF ) + +#define BBB_I2C_IRQ_USED \ + ( AM335X_I2C_IRQSTATUS_ARDY \ + | AM335X_I2C_IRQSTATUS_XRDY ) + +#define BBB_I2C_0_BUS_PATH "/dev/i2c-0" +#define BBB_I2C_1_BUS_PATH "/dev/i2c-1" +#define BBB_I2C_2_BUS_PATH "/dev/i2c-2" + +#define BBB_I2C0_IRQ 70 +#define BBB_I2C1_IRQ 71 +#define BBB_I2C2_IRQ 30 + +#define BBB_MODE2 2 +#define BBB_MODE3 3 + +typedef enum { + I2C0, + I2C1, + I2C2, + I2C_COUNT +} bbb_i2c_id_t; + +typedef struct i2c_regs { + uint32_t BBB_I2C_REVNB_LO; + uint32_t BBB_I2C_REVNB_HI; + uint32_t dummy1[ 2 ]; + uint32_t BBB_I2C_SYSC; + uint32_t dummy2[ 4 ]; + uint32_t BBB_I2C_IRQSTATUS_RAW; + uint32_t BBB_I2C_IRQSTATUS; + uint32_t BBB_I2C_IRQENABLE_SET; + uint32_t BBB_I2C_IRQENABLE_CLR; + uint32_t BBB_I2C_WE; + uint32_t BBB_I2C_DMARXENABLE_SET; + uint32_t BBB_I2C_DMATXENABLE_SET; + uint32_t BBB_I2C_DMARXENABLE_CLR; + uint32_t BBB_I2C_DMATXENABLE_CLR; + uint32_t BBB_I2C_DMARXWAKE_EN; + uint32_t BBB_I2C_DMATXWAKE_EN; + uint32_t dummy3[ 16 ]; + uint32_t BBB_I2C_SYSS; + uint32_t BBB_I2C_BUF; + uint32_t BBB_I2C_CNT; + uint32_t BBB_I2C_DATA; + uint32_t dummy4; + uint32_t BBB_I2C_CON; + uint32_t BBB_I2C_OA; + uint32_t BBB_I2C_SA; + uint32_t BBB_I2C_PSC; + uint32_t BBB_I2C_SCLL; + uint32_t BBB_I2C_SCLH; + uint32_t BBB_I2C_SYSTEST; + uint32_t BBB_I2C_BUFSTAT; + uint32_t BBB_I2C_OA1; + uint32_t BBB_I2C_OA2; + uint32_t BBB_I2C_OA3; + uint32_t BBB_I2C_ACTOA; + uint32_t BBB_I2C_SBLOCK; +} bbb_i2c_regs; + +typedef struct bbb_i2c_bus { + i2c_bus base; + volatile bbb_i2c_regs *regs; + i2c_msg *msgs; + uint32_t msg_todo; + uint32_t current_msg_todo; + uint8_t *current_msg_byte; + uint32_t current_todo; + bool read; + bool hold; + rtems_id task_id; + rtems_vector_number irq; + uint32_t input_clock; + uint32_t already_transferred; +} bbb_i2c_bus; + +int am335x_i2c_bus_register( + const char *bus_path, + uintptr_t register_base, + uint32_t input_clock, + rtems_vector_number irq +); + +static inline int bbb_register_i2c_0( void ) +{ + return am335x_i2c_bus_register( + BBB_I2C_0_BUS_PATH, + AM335X_I2C0_BASE, + I2C_BUS_CLOCK_DEFAULT, + BBB_I2C0_IRQ + ); +} -/* - * The reference minimum clock for high speed is 19.2MHz. - * The linux 2.6.30 kernel uses this value. - * The reference minimum clock for fast mode is 9.6MHz - * The reference minimum clock for standard mode is 4MHz - * In TRM, the value of 12MHz is used. - */ -#ifndef I2C_INTERNAL_SAMPLING_CLK -#define I2C_INTERNAL_SAMPLING_CLK 19200000 -#endif - -#define I2C_PSC_MAX 0x0f -#define I2C_PSC_MIN 0x00 - - -#define DISP_LINE_LEN 128 -#define I2C_TIMEOUT 1000 - -#define I2C_BUS_MAX 3 - -#define I2C_BASE1 (OMAP34XX_CORE_L4_IO_BASE + 0x070000) - -#define I2C_DEFAULT_BASE I2C_BASE1 - -#define I2C_SYSS_RDONE (1 << 0) /* Internel reset monitoring */ - -#define CONFIG_SYS_I2C_SPEED 100000 -#define CONFIG_SYS_I2C_SLAVE 1 - -struct i2c { - unsigned short rev; /* 0x00 */ - unsigned short res1; - unsigned short ie; /* 0x04 */ - unsigned short res2; - unsigned short stat; /* 0x08 */ - unsigned short res3; - unsigned short iv; /* 0x0C */ - unsigned short res4; - unsigned short syss; /* 0x10 */ - unsigned short res4a; - unsigned short buf; /* 0x14 */ - unsigned short res5; - unsigned short cnt; /* 0x18 */ - unsigned short res6; - unsigned short data; /* 0x1C */ - unsigned short res7; - unsigned short sysc; /* 0x20 */ - unsigned short res8; - unsigned short con; /* 0x24 */ - unsigned short res9; - unsigned short oa; /* 0x28 */ - unsigned short res10; - unsigned short sa; /* 0x2C */ - unsigned short res11; - unsigned short psc; /* 0x30 */ - unsigned short res12; - unsigned short scll; /* 0x34 */ - unsigned short res13; - unsigned short sclh; /* 0x38 */ - unsigned short res14; - unsigned short systest; /* 0x3c */ - unsigned short res15; -}; +static inline int bbb_register_i2c_1( void ) +{ + return am335x_i2c_bus_register( + BBB_I2C_1_BUS_PATH, + AM335X_I2C1_BASE, + I2C_BUS_CLOCK_DEFAULT, + BBB_I2C1_IRQ + ); +} + +static inline int bbb_register_i2c_2( void ) +{ + return am335x_i2c_bus_register( + BBB_I2C_2_BUS_PATH, + AM335X_I2C2_BASE, + I2C_BUS_CLOCK_DEFAULT, + BBB_I2C2_IRQ + ); +} #ifdef __cplusplus } |