Lines Matching full:bus
30 * of the bus.
126 #define NPCM_I2CT_OUT 0x14 /* Bus T.O. */
153 #define NPCM_I2CST_BER BIT(5) /* Bus error */
159 #define NPCM_I2CCST_BB BIT(1) /* Bus busy */
337 static inline void npcm_i2c_select_bank(struct npcm_i2c *bus, in npcm_i2c_select_bank() argument
340 u8 i2cctl3 = ioread8(bus->reg + NPCM_I2CCTL3); in npcm_i2c_select_bank()
346 iowrite8(i2cctl3, bus->reg + NPCM_I2CCTL3); in npcm_i2c_select_bank()
349 static void npcm_i2c_init_params(struct npcm_i2c *bus) in npcm_i2c_init_params() argument
351 bus->stop_ind = I2C_NO_STATUS_IND; in npcm_i2c_init_params()
352 bus->rd_size = 0; in npcm_i2c_init_params()
353 bus->wr_size = 0; in npcm_i2c_init_params()
354 bus->rd_ind = 0; in npcm_i2c_init_params()
355 bus->wr_ind = 0; in npcm_i2c_init_params()
356 bus->read_block_use = false; in npcm_i2c_init_params()
357 bus->int_time_stamp = 0; in npcm_i2c_init_params()
358 bus->PEC_use = false; in npcm_i2c_init_params()
359 bus->PEC_mask = 0; in npcm_i2c_init_params()
361 if (bus->slave) in npcm_i2c_init_params()
362 bus->master_or_slave = I2C_SLAVE; in npcm_i2c_init_params()
366 static inline void npcm_i2c_wr_byte(struct npcm_i2c *bus, u8 data) in npcm_i2c_wr_byte() argument
368 iowrite8(data, bus->reg + NPCM_I2CSDA); in npcm_i2c_wr_byte()
371 static inline u8 npcm_i2c_rd_byte(struct npcm_i2c *bus) in npcm_i2c_rd_byte() argument
373 return ioread8(bus->reg + NPCM_I2CSDA); in npcm_i2c_rd_byte()
378 struct npcm_i2c *bus = container_of(_adap, struct npcm_i2c, adap); in npcm_i2c_get_SCL() local
380 return !!(I2CCTL3_SCL_LVL & ioread8(bus->reg + NPCM_I2CCTL3)); in npcm_i2c_get_SCL()
385 struct npcm_i2c *bus = container_of(_adap, struct npcm_i2c, adap); in npcm_i2c_get_SDA() local
387 return !!(I2CCTL3_SDA_LVL & ioread8(bus->reg + NPCM_I2CCTL3)); in npcm_i2c_get_SDA()
390 static inline u16 npcm_i2c_get_index(struct npcm_i2c *bus) in npcm_i2c_get_index() argument
392 if (bus->operation == I2C_READ_OPER) in npcm_i2c_get_index()
393 return bus->rd_ind; in npcm_i2c_get_index()
394 if (bus->operation == I2C_WRITE_OPER) in npcm_i2c_get_index()
395 return bus->wr_ind; in npcm_i2c_get_index()
400 static inline bool npcm_i2c_is_quick(struct npcm_i2c *bus) in npcm_i2c_is_quick() argument
402 return bus->wr_size == 0 && bus->rd_size == 0; in npcm_i2c_is_quick()
405 static void npcm_i2c_disable(struct npcm_i2c *bus) in npcm_i2c_disable() argument
414 iowrite8(0, bus->reg + npcm_i2caddr[i]); in npcm_i2c_disable()
418 i2cctl2 = ioread8(bus->reg + NPCM_I2CCTL2); in npcm_i2c_disable()
420 iowrite8(i2cctl2, bus->reg + NPCM_I2CCTL2); in npcm_i2c_disable()
422 bus->state = I2C_DISABLE; in npcm_i2c_disable()
425 static void npcm_i2c_enable(struct npcm_i2c *bus) in npcm_i2c_enable() argument
427 u8 i2cctl2 = ioread8(bus->reg + NPCM_I2CCTL2); in npcm_i2c_enable()
430 iowrite8(i2cctl2, bus->reg + NPCM_I2CCTL2); in npcm_i2c_enable()
431 bus->state = I2C_IDLE; in npcm_i2c_enable()
435 static inline void npcm_i2c_eob_int(struct npcm_i2c *bus, bool enable) in npcm_i2c_eob_int() argument
440 val = ioread8(bus->reg + NPCM_I2CCST3); in npcm_i2c_eob_int()
442 iowrite8(val, bus->reg + NPCM_I2CCST3); in npcm_i2c_eob_int()
444 val = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_eob_int()
450 iowrite8(val, bus->reg + NPCM_I2CCTL1); in npcm_i2c_eob_int()
453 static inline bool npcm_i2c_tx_fifo_empty(struct npcm_i2c *bus) in npcm_i2c_tx_fifo_empty() argument
457 tx_fifo_sts = ioread8(bus->reg + NPCM_I2CTXF_STS); in npcm_i2c_tx_fifo_empty()
459 if ((tx_fifo_sts & bus->data->txf_sts_tx_bytes) == 0) in npcm_i2c_tx_fifo_empty()
466 static inline bool npcm_i2c_rx_fifo_full(struct npcm_i2c *bus) in npcm_i2c_rx_fifo_full() argument
470 rx_fifo_sts = ioread8(bus->reg + NPCM_I2CRXF_STS); in npcm_i2c_rx_fifo_full()
472 if ((rx_fifo_sts & bus->data->rxf_sts_rx_bytes) == 0) in npcm_i2c_rx_fifo_full()
479 static inline void npcm_i2c_clear_fifo_int(struct npcm_i2c *bus) in npcm_i2c_clear_fifo_int() argument
483 val = ioread8(bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_clear_fifo_int()
485 iowrite8(val, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_clear_fifo_int()
488 static inline void npcm_i2c_clear_tx_fifo(struct npcm_i2c *bus) in npcm_i2c_clear_tx_fifo() argument
492 val = ioread8(bus->reg + NPCM_I2CTXF_STS); in npcm_i2c_clear_tx_fifo()
494 iowrite8(val, bus->reg + NPCM_I2CTXF_STS); in npcm_i2c_clear_tx_fifo()
497 static inline void npcm_i2c_clear_rx_fifo(struct npcm_i2c *bus) in npcm_i2c_clear_rx_fifo() argument
501 val = ioread8(bus->reg + NPCM_I2CRXF_STS); in npcm_i2c_clear_rx_fifo()
503 iowrite8(val, bus->reg + NPCM_I2CRXF_STS); in npcm_i2c_clear_rx_fifo()
506 static void npcm_i2c_int_enable(struct npcm_i2c *bus, bool enable) in npcm_i2c_int_enable() argument
510 val = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_int_enable()
516 iowrite8(val, bus->reg + NPCM_I2CCTL1); in npcm_i2c_int_enable()
519 static inline void npcm_i2c_master_start(struct npcm_i2c *bus) in npcm_i2c_master_start() argument
523 val = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_master_start()
526 iowrite8(val, bus->reg + NPCM_I2CCTL1); in npcm_i2c_master_start()
529 static inline void npcm_i2c_master_stop(struct npcm_i2c *bus) in npcm_i2c_master_stop() argument
539 val = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_master_stop()
542 iowrite8(val, bus->reg + NPCM_I2CCTL1); in npcm_i2c_master_stop()
544 if (!bus->fifo_use) in npcm_i2c_master_stop()
547 npcm_i2c_select_bank(bus, I2C_BANK_1); in npcm_i2c_master_stop()
549 if (bus->operation == I2C_READ_OPER) in npcm_i2c_master_stop()
550 npcm_i2c_clear_rx_fifo(bus); in npcm_i2c_master_stop()
552 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_master_stop()
553 npcm_i2c_clear_fifo_int(bus); in npcm_i2c_master_stop()
554 iowrite8(0, bus->reg + NPCM_I2CTXF_CTL); in npcm_i2c_master_stop()
557 static inline void npcm_i2c_stall_after_start(struct npcm_i2c *bus, bool stall) in npcm_i2c_stall_after_start() argument
561 val = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_stall_after_start()
567 iowrite8(val, bus->reg + NPCM_I2CCTL1); in npcm_i2c_stall_after_start()
570 static inline void npcm_i2c_nack(struct npcm_i2c *bus) in npcm_i2c_nack() argument
574 val = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_nack()
577 iowrite8(val, bus->reg + NPCM_I2CCTL1); in npcm_i2c_nack()
580 static inline void npcm_i2c_clear_master_status(struct npcm_i2c *bus) in npcm_i2c_clear_master_status() argument
586 iowrite8(val, bus->reg + NPCM_I2CST); in npcm_i2c_clear_master_status()
590 static void npcm_i2c_slave_int_enable(struct npcm_i2c *bus, bool enable) in npcm_i2c_slave_int_enable() argument
595 i2cctl1 = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_slave_int_enable()
601 iowrite8(i2cctl1, bus->reg + NPCM_I2CCTL1); in npcm_i2c_slave_int_enable()
604 static int npcm_i2c_slave_enable(struct npcm_i2c *bus, enum i2c_addr addr_type, in npcm_i2c_slave_enable() argument
613 i2cctl1 = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_slave_enable()
618 iowrite8(i2cctl1, bus->reg + NPCM_I2CCTL1); in npcm_i2c_slave_enable()
621 i2cctl3 = ioread8(bus->reg + NPCM_I2CCTL3); in npcm_i2c_slave_enable()
626 iowrite8(i2cctl3, bus->reg + NPCM_I2CCTL3); in npcm_i2c_slave_enable()
630 dev_err(bus->dev, "try to enable more than 2 SA not supported\n"); in npcm_i2c_slave_enable()
636 iowrite8(sa_reg, bus->reg + npcm_i2caddr[addr_type]); in npcm_i2c_slave_enable()
637 npcm_i2c_slave_int_enable(bus, enable); in npcm_i2c_slave_enable()
643 static void npcm_i2c_reset(struct npcm_i2c *bus) in npcm_i2c_reset() argument
654 i2cctl1 = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_reset()
656 npcm_i2c_disable(bus); in npcm_i2c_reset()
657 npcm_i2c_enable(bus); in npcm_i2c_reset()
661 iowrite8(i2cctl1, bus->reg + NPCM_I2CCTL1); in npcm_i2c_reset()
663 /* Clear BB (BUS BUSY) bit */ in npcm_i2c_reset()
664 iowrite8(NPCM_I2CCST_BB, bus->reg + NPCM_I2CCST); in npcm_i2c_reset()
665 iowrite8(0xFF, bus->reg + NPCM_I2CST); in npcm_i2c_reset()
668 npcm_i2c_eob_int(bus, false); in npcm_i2c_reset()
671 iowrite8(NPCM_I2CFIF_CTS_CLR_FIFO, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_reset()
674 if (bus->slave) { in npcm_i2c_reset()
675 addr = bus->slave->addr; in npcm_i2c_reset()
676 npcm_i2c_slave_enable(bus, I2C_SLAVE_ADDR1, addr, true); in npcm_i2c_reset()
681 npcm_i2c_clear_master_status(bus); in npcm_i2c_reset()
683 bus->state = I2C_IDLE; in npcm_i2c_reset()
686 static inline bool npcm_i2c_is_master(struct npcm_i2c *bus) in npcm_i2c_is_master() argument
688 return !!FIELD_GET(NPCM_I2CST_MASTER, ioread8(bus->reg + NPCM_I2CST)); in npcm_i2c_is_master()
691 static void npcm_i2c_callback(struct npcm_i2c *bus, in npcm_i2c_callback() argument
698 msgs = bus->msgs; in npcm_i2c_callback()
699 msgs_num = bus->msgs_num; in npcm_i2c_callback()
707 if (completion_done(&bus->cmd_complete)) in npcm_i2c_callback()
712 bus->cmd_err = bus->msgs_num; in npcm_i2c_callback()
713 if (bus->tx_complete_cnt < ULLONG_MAX) in npcm_i2c_callback()
714 bus->tx_complete_cnt++; in npcm_i2c_callback()
718 if (bus->msgs) { in npcm_i2c_callback()
729 bus->cmd_err = -ENXIO; in npcm_i2c_callback()
733 /* Bus error */ in npcm_i2c_callback()
734 bus->cmd_err = -EAGAIN; in npcm_i2c_callback()
744 bus->operation = I2C_NO_OPER; in npcm_i2c_callback()
746 if (bus->slave) in npcm_i2c_callback()
747 bus->master_or_slave = I2C_SLAVE; in npcm_i2c_callback()
750 complete(&bus->cmd_complete); in npcm_i2c_callback()
753 static u8 npcm_i2c_fifo_usage(struct npcm_i2c *bus) in npcm_i2c_fifo_usage() argument
755 if (bus->operation == I2C_WRITE_OPER) in npcm_i2c_fifo_usage()
756 return (bus->data->txf_sts_tx_bytes & in npcm_i2c_fifo_usage()
757 ioread8(bus->reg + NPCM_I2CTXF_STS)); in npcm_i2c_fifo_usage()
758 if (bus->operation == I2C_READ_OPER) in npcm_i2c_fifo_usage()
759 return (bus->data->rxf_sts_rx_bytes & in npcm_i2c_fifo_usage()
760 ioread8(bus->reg + NPCM_I2CRXF_STS)); in npcm_i2c_fifo_usage()
764 static void npcm_i2c_write_to_fifo_master(struct npcm_i2c *bus, u16 max_bytes) in npcm_i2c_write_to_fifo_master() argument
772 size_free_fifo = bus->data->fifo_size - npcm_i2c_fifo_usage(bus); in npcm_i2c_write_to_fifo_master()
774 if (bus->wr_ind < bus->wr_size) in npcm_i2c_write_to_fifo_master()
775 npcm_i2c_wr_byte(bus, bus->wr_buf[bus->wr_ind++]); in npcm_i2c_write_to_fifo_master()
777 npcm_i2c_wr_byte(bus, 0xFF); in npcm_i2c_write_to_fifo_master()
778 size_free_fifo = bus->data->fifo_size - npcm_i2c_fifo_usage(bus); in npcm_i2c_write_to_fifo_master()
787 static void npcm_i2c_set_fifo(struct npcm_i2c *bus, int nread, int nwrite) in npcm_i2c_set_fifo() argument
791 if (!bus->fifo_use) in npcm_i2c_set_fifo()
793 npcm_i2c_select_bank(bus, I2C_BANK_1); in npcm_i2c_set_fifo()
794 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_set_fifo()
795 npcm_i2c_clear_rx_fifo(bus); in npcm_i2c_set_fifo()
799 rxf_ctl = min_t(int, nread, bus->data->fifo_size); in npcm_i2c_set_fifo()
802 if (nread <= bus->data->fifo_size) in npcm_i2c_set_fifo()
803 rxf_ctl |= bus->data->rxf_ctl_last_pec; in npcm_i2c_set_fifo()
810 if (bus->rd_ind == 0 && bus->read_block_use) { in npcm_i2c_set_fifo()
816 iowrite8(rxf_ctl, bus->reg + NPCM_I2CRXF_CTL); in npcm_i2c_set_fifo()
821 if (nwrite > bus->data->fifo_size) in npcm_i2c_set_fifo()
823 iowrite8(bus->data->fifo_size, bus->reg + NPCM_I2CTXF_CTL); in npcm_i2c_set_fifo()
825 iowrite8(nwrite, bus->reg + NPCM_I2CTXF_CTL); in npcm_i2c_set_fifo()
827 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_set_fifo()
831 static void npcm_i2c_read_fifo(struct npcm_i2c *bus, u8 bytes_in_fifo) in npcm_i2c_read_fifo() argument
836 data = npcm_i2c_rd_byte(bus); in npcm_i2c_read_fifo()
837 if (bus->rd_ind < bus->rd_size) in npcm_i2c_read_fifo()
838 bus->rd_buf[bus->rd_ind++] = data; in npcm_i2c_read_fifo()
842 static void npcm_i2c_master_abort(struct npcm_i2c *bus) in npcm_i2c_master_abort() argument
845 if (!npcm_i2c_is_master(bus)) in npcm_i2c_master_abort()
848 npcm_i2c_eob_int(bus, true); in npcm_i2c_master_abort()
849 npcm_i2c_master_stop(bus); in npcm_i2c_master_abort()
850 npcm_i2c_clear_master_status(bus); in npcm_i2c_master_abort()
854 static u8 npcm_i2c_get_slave_addr(struct npcm_i2c *bus, enum i2c_addr addr_type) in npcm_i2c_get_slave_addr() argument
859 dev_err(bus->dev, "get slave: try to use more than 2 SA not supported\n"); in npcm_i2c_get_slave_addr()
861 slave_add = ioread8(bus->reg + npcm_i2caddr[(int)addr_type]); in npcm_i2c_get_slave_addr()
866 static int npcm_i2c_remove_slave_addr(struct npcm_i2c *bus, u8 slave_add) in npcm_i2c_remove_slave_addr() argument
874 if (ioread8(bus->reg + npcm_i2caddr[i]) == slave_add) in npcm_i2c_remove_slave_addr()
875 iowrite8(0, bus->reg + npcm_i2caddr[i]); in npcm_i2c_remove_slave_addr()
881 static void npcm_i2c_write_fifo_slave(struct npcm_i2c *bus, u16 max_bytes) in npcm_i2c_write_fifo_slave() argument
887 npcm_i2c_clear_fifo_int(bus); in npcm_i2c_write_fifo_slave()
888 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_write_fifo_slave()
889 iowrite8(0, bus->reg + NPCM_I2CTXF_CTL); in npcm_i2c_write_fifo_slave()
890 while (max_bytes-- && bus->data->fifo_size != npcm_i2c_fifo_usage(bus)) { in npcm_i2c_write_fifo_slave()
891 if (bus->slv_wr_size <= 0) in npcm_i2c_write_fifo_slave()
893 bus->slv_wr_ind = bus->slv_wr_ind & (bus->data->fifo_size - 1); in npcm_i2c_write_fifo_slave()
894 npcm_i2c_wr_byte(bus, bus->slv_wr_buf[bus->slv_wr_ind]); in npcm_i2c_write_fifo_slave()
895 bus->slv_wr_ind++; in npcm_i2c_write_fifo_slave()
896 bus->slv_wr_ind = bus->slv_wr_ind & (bus->data->fifo_size - 1); in npcm_i2c_write_fifo_slave()
897 bus->slv_wr_size--; in npcm_i2c_write_fifo_slave()
901 static void npcm_i2c_read_fifo_slave(struct npcm_i2c *bus, u8 bytes_in_fifo) in npcm_i2c_read_fifo_slave() argument
905 if (!bus->slave) in npcm_i2c_read_fifo_slave()
909 data = npcm_i2c_rd_byte(bus); in npcm_i2c_read_fifo_slave()
911 bus->slv_rd_ind = bus->slv_rd_ind & (bus->data->fifo_size - 1); in npcm_i2c_read_fifo_slave()
912 bus->slv_rd_buf[bus->slv_rd_ind] = data; in npcm_i2c_read_fifo_slave()
913 bus->slv_rd_ind++; in npcm_i2c_read_fifo_slave()
916 if (bus->slv_rd_ind == 1 && bus->read_block_use) in npcm_i2c_read_fifo_slave()
917 bus->slv_rd_size = data + bus->PEC_use + 1; in npcm_i2c_read_fifo_slave()
921 static int npcm_i2c_slave_get_wr_buf(struct npcm_i2c *bus) in npcm_i2c_slave_get_wr_buf() argument
926 int ret = bus->slv_wr_ind; in npcm_i2c_slave_get_wr_buf()
929 for (i = 0; i < bus->data->fifo_size; i++) { in npcm_i2c_slave_get_wr_buf()
930 if (bus->slv_wr_size >= bus->data->fifo_size) in npcm_i2c_slave_get_wr_buf()
932 if (bus->state == I2C_SLAVE_MATCH) { in npcm_i2c_slave_get_wr_buf()
933 i2c_slave_event(bus->slave, I2C_SLAVE_READ_REQUESTED, &value); in npcm_i2c_slave_get_wr_buf()
934 bus->state = I2C_OPER_STARTED; in npcm_i2c_slave_get_wr_buf()
936 i2c_slave_event(bus->slave, I2C_SLAVE_READ_PROCESSED, &value); in npcm_i2c_slave_get_wr_buf()
938 ind = (bus->slv_wr_ind + bus->slv_wr_size) & (bus->data->fifo_size - 1); in npcm_i2c_slave_get_wr_buf()
939 bus->slv_wr_buf[ind] = value; in npcm_i2c_slave_get_wr_buf()
940 bus->slv_wr_size++; in npcm_i2c_slave_get_wr_buf()
942 return bus->data->fifo_size - ret; in npcm_i2c_slave_get_wr_buf()
945 static void npcm_i2c_slave_send_rd_buf(struct npcm_i2c *bus) in npcm_i2c_slave_send_rd_buf() argument
949 for (i = 0; i < bus->slv_rd_ind; i++) in npcm_i2c_slave_send_rd_buf()
950 i2c_slave_event(bus->slave, I2C_SLAVE_WRITE_RECEIVED, in npcm_i2c_slave_send_rd_buf()
951 &bus->slv_rd_buf[i]); in npcm_i2c_slave_send_rd_buf()
956 if (bus->slv_rd_ind) { in npcm_i2c_slave_send_rd_buf()
957 bus->slv_wr_size = 0; in npcm_i2c_slave_send_rd_buf()
958 bus->slv_wr_ind = 0; in npcm_i2c_slave_send_rd_buf()
961 bus->slv_rd_ind = 0; in npcm_i2c_slave_send_rd_buf()
962 bus->slv_rd_size = bus->adap.quirks->max_read_len; in npcm_i2c_slave_send_rd_buf()
964 npcm_i2c_clear_fifo_int(bus); in npcm_i2c_slave_send_rd_buf()
965 npcm_i2c_clear_rx_fifo(bus); in npcm_i2c_slave_send_rd_buf()
968 static void npcm_i2c_slave_receive(struct npcm_i2c *bus, u16 nread, in npcm_i2c_slave_receive() argument
971 bus->state = I2C_OPER_STARTED; in npcm_i2c_slave_receive()
972 bus->operation = I2C_READ_OPER; in npcm_i2c_slave_receive()
973 bus->slv_rd_size = nread; in npcm_i2c_slave_receive()
974 bus->slv_rd_ind = 0; in npcm_i2c_slave_receive()
976 iowrite8(0, bus->reg + NPCM_I2CTXF_CTL); in npcm_i2c_slave_receive()
977 iowrite8(bus->data->fifo_size, bus->reg + NPCM_I2CRXF_CTL); in npcm_i2c_slave_receive()
978 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_slave_receive()
979 npcm_i2c_clear_rx_fifo(bus); in npcm_i2c_slave_receive()
982 static void npcm_i2c_slave_xmit(struct npcm_i2c *bus, u16 nwrite, in npcm_i2c_slave_xmit() argument
988 bus->operation = I2C_WRITE_OPER; in npcm_i2c_slave_xmit()
991 npcm_i2c_slave_get_wr_buf(bus); in npcm_i2c_slave_xmit()
992 npcm_i2c_write_fifo_slave(bus, nwrite); in npcm_i2c_slave_xmit()
1000 * to the FIFO and onward to the bus.
1001 * NACK on read will be once reached to bus->adap->quirks->max_read_len.
1006 static void npcm_i2c_slave_wr_buf_sync(struct npcm_i2c *bus) in npcm_i2c_slave_wr_buf_sync() argument
1010 left_in_fifo = bus->data->txf_sts_tx_bytes & in npcm_i2c_slave_wr_buf_sync()
1011 ioread8(bus->reg + NPCM_I2CTXF_STS); in npcm_i2c_slave_wr_buf_sync()
1014 if (left_in_fifo >= bus->data->fifo_size || in npcm_i2c_slave_wr_buf_sync()
1015 bus->slv_wr_size >= bus->data->fifo_size) in npcm_i2c_slave_wr_buf_sync()
1019 bus->slv_wr_ind = bus->slv_wr_ind - left_in_fifo; in npcm_i2c_slave_wr_buf_sync()
1020 bus->slv_wr_size = bus->slv_wr_size + left_in_fifo; in npcm_i2c_slave_wr_buf_sync()
1022 if (bus->slv_wr_ind < 0) in npcm_i2c_slave_wr_buf_sync()
1023 bus->slv_wr_ind += bus->data->fifo_size; in npcm_i2c_slave_wr_buf_sync()
1026 static void npcm_i2c_slave_rd_wr(struct npcm_i2c *bus) in npcm_i2c_slave_rd_wr() argument
1028 if (NPCM_I2CST_XMIT & ioread8(bus->reg + NPCM_I2CST)) { in npcm_i2c_slave_rd_wr()
1033 bus->operation = I2C_WRITE_OPER; in npcm_i2c_slave_rd_wr()
1034 npcm_i2c_slave_xmit(bus, bus->adap.quirks->max_write_len, in npcm_i2c_slave_rd_wr()
1035 bus->slv_wr_buf); in npcm_i2c_slave_rd_wr()
1043 bus->operation = I2C_READ_OPER; in npcm_i2c_slave_rd_wr()
1044 npcm_i2c_read_fifo_slave(bus, npcm_i2c_fifo_usage(bus)); in npcm_i2c_slave_rd_wr()
1045 bus->stop_ind = I2C_SLAVE_RCV_IND; in npcm_i2c_slave_rd_wr()
1046 npcm_i2c_slave_send_rd_buf(bus); in npcm_i2c_slave_rd_wr()
1047 npcm_i2c_slave_receive(bus, bus->adap.quirks->max_read_len, in npcm_i2c_slave_rd_wr()
1048 bus->slv_rd_buf); in npcm_i2c_slave_rd_wr()
1052 static irqreturn_t npcm_i2c_int_slave_handler(struct npcm_i2c *bus) in npcm_i2c_int_slave_handler() argument
1056 u8 i2cst = ioread8(bus->reg + NPCM_I2CST); in npcm_i2c_int_slave_handler()
1060 bus->stop_ind = I2C_NACK_IND; in npcm_i2c_int_slave_handler()
1061 npcm_i2c_slave_wr_buf_sync(bus); in npcm_i2c_int_slave_handler()
1062 if (bus->fifo_use) in npcm_i2c_int_slave_handler()
1065 bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_int_slave_handler()
1068 bus->stop_ind = I2C_NO_STATUS_IND; in npcm_i2c_int_slave_handler()
1069 bus->operation = I2C_NO_OPER; in npcm_i2c_int_slave_handler()
1070 bus->own_slave_addr = 0xFF; in npcm_i2c_int_slave_handler()
1076 iowrite8(NPCM_I2CST_NEGACK, bus->reg + NPCM_I2CST); in npcm_i2c_int_slave_handler()
1081 /* Slave mode: a Bus Error (BER) has been identified */ in npcm_i2c_int_slave_handler()
1084 * Check whether bus arbitration or Start or Stop during data in npcm_i2c_int_slave_handler()
1085 * xfer bus arbitration problem should not result in recovery in npcm_i2c_int_slave_handler()
1087 bus->stop_ind = I2C_BUS_ERR_IND; in npcm_i2c_int_slave_handler()
1089 /* wait for bus busy before clear fifo */ in npcm_i2c_int_slave_handler()
1090 iowrite8(NPCM_I2CFIF_CTS_CLR_FIFO, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_int_slave_handler()
1092 bus->state = I2C_IDLE; in npcm_i2c_int_slave_handler()
1098 if (completion_done(&bus->cmd_complete) == false) { in npcm_i2c_int_slave_handler()
1099 bus->cmd_err = -EIO; in npcm_i2c_int_slave_handler()
1100 complete(&bus->cmd_complete); in npcm_i2c_int_slave_handler()
1102 bus->own_slave_addr = 0xFF; in npcm_i2c_int_slave_handler()
1103 iowrite8(NPCM_I2CST_BER, bus->reg + NPCM_I2CST); in npcm_i2c_int_slave_handler()
1109 u8 bytes_in_fifo = npcm_i2c_fifo_usage(bus); in npcm_i2c_int_slave_handler()
1111 bus->stop_ind = I2C_SLAVE_DONE_IND; in npcm_i2c_int_slave_handler()
1113 if (bus->operation == I2C_READ_OPER) in npcm_i2c_int_slave_handler()
1114 npcm_i2c_read_fifo_slave(bus, bytes_in_fifo); in npcm_i2c_int_slave_handler()
1117 npcm_i2c_slave_send_rd_buf(bus); in npcm_i2c_int_slave_handler()
1120 bus->stop_ind = I2C_NO_STATUS_IND; in npcm_i2c_int_slave_handler()
1127 bus->operation = I2C_NO_OPER; in npcm_i2c_int_slave_handler()
1128 bus->own_slave_addr = 0xFF; in npcm_i2c_int_slave_handler()
1129 i2c_slave_event(bus->slave, I2C_SLAVE_STOP, 0); in npcm_i2c_int_slave_handler()
1130 iowrite8(NPCM_I2CST_SLVSTP, bus->reg + NPCM_I2CST); in npcm_i2c_int_slave_handler()
1131 if (bus->fifo_use) { in npcm_i2c_int_slave_handler()
1132 npcm_i2c_clear_fifo_int(bus); in npcm_i2c_int_slave_handler()
1133 npcm_i2c_clear_rx_fifo(bus); in npcm_i2c_int_slave_handler()
1134 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_int_slave_handler()
1137 bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_int_slave_handler()
1139 bus->state = I2C_IDLE; in npcm_i2c_int_slave_handler()
1144 if (bus->fifo_use && FIELD_GET(NPCM_I2CFIF_CTS_SLVRSTR, in npcm_i2c_int_slave_handler()
1145 ioread8(bus->reg + NPCM_I2CFIF_CTS))) { in npcm_i2c_int_slave_handler()
1146 bus->stop_ind = I2C_SLAVE_RESTART_IND; in npcm_i2c_int_slave_handler()
1147 bus->master_or_slave = I2C_SLAVE; in npcm_i2c_int_slave_handler()
1148 if (bus->operation == I2C_READ_OPER) in npcm_i2c_int_slave_handler()
1149 npcm_i2c_read_fifo_slave(bus, npcm_i2c_fifo_usage(bus)); in npcm_i2c_int_slave_handler()
1150 bus->operation = I2C_WRITE_OPER; in npcm_i2c_int_slave_handler()
1151 iowrite8(0, bus->reg + NPCM_I2CRXF_CTL); in npcm_i2c_int_slave_handler()
1154 iowrite8(val, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_int_slave_handler()
1155 npcm_i2c_slave_rd_wr(bus); in npcm_i2c_int_slave_handler()
1164 bus->master_or_slave = I2C_SLAVE; in npcm_i2c_int_slave_handler()
1165 npcm_i2c_clear_fifo_int(bus); in npcm_i2c_int_slave_handler()
1166 npcm_i2c_clear_rx_fifo(bus); in npcm_i2c_int_slave_handler()
1167 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_int_slave_handler()
1168 iowrite8(0, bus->reg + NPCM_I2CTXF_CTL); in npcm_i2c_int_slave_handler()
1169 iowrite8(bus->data->fifo_size, bus->reg + NPCM_I2CRXF_CTL); in npcm_i2c_int_slave_handler()
1171 bus->operation = I2C_WRITE_OPER; in npcm_i2c_int_slave_handler()
1173 i2c_slave_event(bus->slave, I2C_SLAVE_WRITE_REQUESTED, in npcm_i2c_int_slave_handler()
1175 bus->operation = I2C_READ_OPER; in npcm_i2c_int_slave_handler()
1177 if (bus->own_slave_addr == 0xFF) { in npcm_i2c_int_slave_handler()
1179 val = ioread8(bus->reg + NPCM_I2CCST); in npcm_i2c_int_slave_handler()
1186 i2ccst3 = ioread8(bus->reg + NPCM_I2CCST3); in npcm_i2c_int_slave_handler()
1187 i2ccst2 = ioread8(bus->reg + NPCM_I2CCST2); in npcm_i2c_int_slave_handler()
1198 addr = npcm_i2c_get_slave_addr(bus, eaddr); in npcm_i2c_int_slave_handler()
1200 bus->own_slave_addr = addr; in npcm_i2c_int_slave_handler()
1201 if (bus->PEC_mask & BIT(info)) in npcm_i2c_int_slave_handler()
1202 bus->PEC_use = true; in npcm_i2c_int_slave_handler()
1204 bus->PEC_use = false; in npcm_i2c_int_slave_handler()
1207 bus->own_slave_addr = 0; in npcm_i2c_int_slave_handler()
1209 bus->own_slave_addr = 0x61; in npcm_i2c_int_slave_handler()
1220 if ((bus->state == I2C_OPER_STARTED && in npcm_i2c_int_slave_handler()
1221 bus->operation == I2C_READ_OPER && in npcm_i2c_int_slave_handler()
1222 bus->stop_ind == I2C_SLAVE_XMIT_IND) || in npcm_i2c_int_slave_handler()
1223 bus->stop_ind == I2C_SLAVE_RCV_IND) { in npcm_i2c_int_slave_handler()
1225 bus->stop_ind = I2C_SLAVE_RESTART_IND; in npcm_i2c_int_slave_handler()
1230 bus->stop_ind = I2C_SLAVE_XMIT_IND; in npcm_i2c_int_slave_handler()
1232 bus->stop_ind = I2C_SLAVE_RCV_IND; in npcm_i2c_int_slave_handler()
1233 bus->state = I2C_SLAVE_MATCH; in npcm_i2c_int_slave_handler()
1234 npcm_i2c_slave_rd_wr(bus); in npcm_i2c_int_slave_handler()
1235 iowrite8(NPCM_I2CST_NMATCH, bus->reg + NPCM_I2CST); in npcm_i2c_int_slave_handler()
1241 (bus->fifo_use && in npcm_i2c_int_slave_handler()
1242 (npcm_i2c_tx_fifo_empty(bus) || npcm_i2c_rx_fifo_full(bus)))) { in npcm_i2c_int_slave_handler()
1243 npcm_i2c_slave_rd_wr(bus); in npcm_i2c_int_slave_handler()
1244 iowrite8(NPCM_I2CST_SDAST, bus->reg + NPCM_I2CST); in npcm_i2c_int_slave_handler()
1253 npcm_i2c_eob_int(bus, false); in npcm_i2c_int_slave_handler()
1254 npcm_i2c_clear_master_status(bus); in npcm_i2c_int_slave_handler()
1263 struct npcm_i2c *bus = i2c_get_adapdata(client->adapter); in npcm_i2c_reg_slave() local
1265 bus->slave = client; in npcm_i2c_reg_slave()
1267 if (!bus->slave) in npcm_i2c_reg_slave()
1273 spin_lock_irqsave(&bus->lock, lock_flags); in npcm_i2c_reg_slave()
1275 npcm_i2c_init_params(bus); in npcm_i2c_reg_slave()
1276 bus->slv_rd_size = 0; in npcm_i2c_reg_slave()
1277 bus->slv_wr_size = 0; in npcm_i2c_reg_slave()
1278 bus->slv_rd_ind = 0; in npcm_i2c_reg_slave()
1279 bus->slv_wr_ind = 0; in npcm_i2c_reg_slave()
1281 bus->PEC_use = true; in npcm_i2c_reg_slave()
1283 dev_info(bus->dev, "i2c%d register slave SA=0x%x, PEC=%d\n", bus->num, in npcm_i2c_reg_slave()
1284 client->addr, bus->PEC_use); in npcm_i2c_reg_slave()
1286 npcm_i2c_slave_enable(bus, I2C_SLAVE_ADDR1, client->addr, true); in npcm_i2c_reg_slave()
1287 npcm_i2c_clear_fifo_int(bus); in npcm_i2c_reg_slave()
1288 npcm_i2c_clear_rx_fifo(bus); in npcm_i2c_reg_slave()
1289 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_reg_slave()
1290 npcm_i2c_slave_int_enable(bus, true); in npcm_i2c_reg_slave()
1292 spin_unlock_irqrestore(&bus->lock, lock_flags); in npcm_i2c_reg_slave()
1298 struct npcm_i2c *bus = client->adapter->algo_data; in npcm_i2c_unreg_slave() local
1301 spin_lock_irqsave(&bus->lock, lock_flags); in npcm_i2c_unreg_slave()
1302 if (!bus->slave) { in npcm_i2c_unreg_slave()
1303 spin_unlock_irqrestore(&bus->lock, lock_flags); in npcm_i2c_unreg_slave()
1306 npcm_i2c_slave_int_enable(bus, false); in npcm_i2c_unreg_slave()
1307 npcm_i2c_remove_slave_addr(bus, client->addr); in npcm_i2c_unreg_slave()
1308 bus->slave = NULL; in npcm_i2c_unreg_slave()
1309 spin_unlock_irqrestore(&bus->lock, lock_flags); in npcm_i2c_unreg_slave()
1314 static void npcm_i2c_master_fifo_read(struct npcm_i2c *bus) in npcm_i2c_master_fifo_read() argument
1320 fifo_bytes = npcm_i2c_fifo_usage(bus); in npcm_i2c_master_fifo_read()
1321 rcount = bus->rd_size - bus->rd_ind; in npcm_i2c_master_fifo_read()
1330 if (rcount < (2 * bus->data->fifo_size) && rcount > bus->data->fifo_size) in npcm_i2c_master_fifo_read()
1331 fifo_bytes = rcount - bus->data->fifo_size; in npcm_i2c_master_fifo_read()
1335 bus->state = I2C_STOP_PENDING; in npcm_i2c_master_fifo_read()
1336 bus->stop_ind = ind; in npcm_i2c_master_fifo_read()
1337 npcm_i2c_eob_int(bus, true); in npcm_i2c_master_fifo_read()
1339 npcm_i2c_master_stop(bus); in npcm_i2c_master_fifo_read()
1340 npcm_i2c_read_fifo(bus, fifo_bytes); in npcm_i2c_master_fifo_read()
1342 npcm_i2c_read_fifo(bus, fifo_bytes); in npcm_i2c_master_fifo_read()
1343 rcount = bus->rd_size - bus->rd_ind; in npcm_i2c_master_fifo_read()
1344 npcm_i2c_set_fifo(bus, rcount, -1); in npcm_i2c_master_fifo_read()
1348 static void npcm_i2c_irq_master_handler_write(struct npcm_i2c *bus) in npcm_i2c_irq_master_handler_write() argument
1352 if (bus->fifo_use) in npcm_i2c_irq_master_handler_write()
1353 npcm_i2c_clear_tx_fifo(bus); /* clear the TX fifo status bit */ in npcm_i2c_irq_master_handler_write()
1356 if (bus->wr_ind == bus->wr_size) { in npcm_i2c_irq_master_handler_write()
1357 if (bus->fifo_use && npcm_i2c_fifo_usage(bus) > 0) in npcm_i2c_irq_master_handler_write()
1367 if (bus->rd_size == 0) { in npcm_i2c_irq_master_handler_write()
1369 npcm_i2c_eob_int(bus, true); in npcm_i2c_irq_master_handler_write()
1370 bus->state = I2C_STOP_PENDING; in npcm_i2c_irq_master_handler_write()
1371 bus->stop_ind = I2C_MASTER_DONE_IND; in npcm_i2c_irq_master_handler_write()
1372 npcm_i2c_master_stop(bus); in npcm_i2c_irq_master_handler_write()
1374 npcm_i2c_wr_byte(bus, 0xFF); in npcm_i2c_irq_master_handler_write()
1378 npcm_i2c_set_fifo(bus, bus->rd_size, -1); in npcm_i2c_irq_master_handler_write()
1380 npcm_i2c_master_start(bus); in npcm_i2c_irq_master_handler_write()
1388 if (bus->rd_size == 1) in npcm_i2c_irq_master_handler_write()
1389 npcm_i2c_stall_after_start(bus, true); in npcm_i2c_irq_master_handler_write()
1392 bus->operation = I2C_READ_OPER; in npcm_i2c_irq_master_handler_write()
1394 npcm_i2c_wr_byte(bus, bus->dest_addr | 0x1); in npcm_i2c_irq_master_handler_write()
1398 if (!bus->fifo_use || bus->wr_size == 1) { in npcm_i2c_irq_master_handler_write()
1399 npcm_i2c_wr_byte(bus, bus->wr_buf[bus->wr_ind++]); in npcm_i2c_irq_master_handler_write()
1401 wcount = bus->wr_size - bus->wr_ind; in npcm_i2c_irq_master_handler_write()
1402 npcm_i2c_set_fifo(bus, -1, wcount); in npcm_i2c_irq_master_handler_write()
1404 npcm_i2c_write_to_fifo_master(bus, wcount); in npcm_i2c_irq_master_handler_write()
1409 static void npcm_i2c_irq_master_handler_read(struct npcm_i2c *bus) in npcm_i2c_irq_master_handler_read() argument
1415 block_extra_bytes_size = bus->read_block_use + bus->PEC_use; in npcm_i2c_irq_master_handler_read()
1421 if (bus->rd_ind == 0) { /* first byte handling: */ in npcm_i2c_irq_master_handler_read()
1422 if (bus->read_block_use) { in npcm_i2c_irq_master_handler_read()
1424 data = npcm_i2c_rd_byte(bus); in npcm_i2c_irq_master_handler_read()
1426 bus->rd_size = data + block_extra_bytes_size; in npcm_i2c_irq_master_handler_read()
1427 bus->rd_buf[bus->rd_ind++] = data; in npcm_i2c_irq_master_handler_read()
1430 if (bus->fifo_use) { in npcm_i2c_irq_master_handler_read()
1431 data = ioread8(bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_irq_master_handler_read()
1433 iowrite8(data, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_irq_master_handler_read()
1436 npcm_i2c_set_fifo(bus, bus->rd_size - 1, -1); in npcm_i2c_irq_master_handler_read()
1437 npcm_i2c_stall_after_start(bus, false); in npcm_i2c_irq_master_handler_read()
1439 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_irq_master_handler_read()
1440 npcm_i2c_master_fifo_read(bus); in npcm_i2c_irq_master_handler_read()
1443 if (bus->rd_size == block_extra_bytes_size && in npcm_i2c_irq_master_handler_read()
1444 bus->read_block_use) { in npcm_i2c_irq_master_handler_read()
1445 bus->state = I2C_STOP_PENDING; in npcm_i2c_irq_master_handler_read()
1446 bus->stop_ind = I2C_BLOCK_BYTES_ERR_IND; in npcm_i2c_irq_master_handler_read()
1447 bus->cmd_err = -EIO; in npcm_i2c_irq_master_handler_read()
1448 npcm_i2c_eob_int(bus, true); in npcm_i2c_irq_master_handler_read()
1449 npcm_i2c_master_stop(bus); in npcm_i2c_irq_master_handler_read()
1450 npcm_i2c_read_fifo(bus, npcm_i2c_fifo_usage(bus)); in npcm_i2c_irq_master_handler_read()
1452 npcm_i2c_master_fifo_read(bus); in npcm_i2c_irq_master_handler_read()
1457 static void npcm_i2c_irq_handle_nmatch(struct npcm_i2c *bus) in npcm_i2c_irq_handle_nmatch() argument
1459 iowrite8(NPCM_I2CST_NMATCH, bus->reg + NPCM_I2CST); in npcm_i2c_irq_handle_nmatch()
1460 npcm_i2c_nack(bus); in npcm_i2c_irq_handle_nmatch()
1461 bus->stop_ind = I2C_BUS_ERR_IND; in npcm_i2c_irq_handle_nmatch()
1462 npcm_i2c_callback(bus, bus->stop_ind, npcm_i2c_get_index(bus)); in npcm_i2c_irq_handle_nmatch()
1466 static void npcm_i2c_irq_handle_nack(struct npcm_i2c *bus) in npcm_i2c_irq_handle_nack() argument
1470 if (bus->nack_cnt < ULLONG_MAX) in npcm_i2c_irq_handle_nack()
1471 bus->nack_cnt++; in npcm_i2c_irq_handle_nack()
1473 if (bus->fifo_use) { in npcm_i2c_irq_handle_nack()
1478 if (bus->operation == I2C_WRITE_OPER) in npcm_i2c_irq_handle_nack()
1479 bus->wr_ind -= npcm_i2c_fifo_usage(bus); in npcm_i2c_irq_handle_nack()
1482 iowrite8(NPCM_I2CFIF_CTS_CLR_FIFO, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_irq_handle_nack()
1486 bus->stop_ind = I2C_NACK_IND; in npcm_i2c_irq_handle_nack()
1488 if (npcm_i2c_is_master(bus)) { in npcm_i2c_irq_handle_nack()
1490 npcm_i2c_eob_int(bus, false); in npcm_i2c_irq_handle_nack()
1491 npcm_i2c_master_stop(bus); in npcm_i2c_irq_handle_nack()
1494 npcm_i2c_rd_byte(bus); in npcm_i2c_irq_handle_nack()
1497 * The bus is released from stall only after the SW clears in npcm_i2c_irq_handle_nack()
1500 npcm_i2c_clear_master_status(bus); in npcm_i2c_irq_handle_nack()
1501 readx_poll_timeout_atomic(ioread8, bus->reg + NPCM_I2CCST, val, in npcm_i2c_irq_handle_nack()
1503 /* Verify no status bits are still set after bus is released */ in npcm_i2c_irq_handle_nack()
1504 npcm_i2c_clear_master_status(bus); in npcm_i2c_irq_handle_nack()
1506 bus->state = I2C_IDLE; in npcm_i2c_irq_handle_nack()
1510 * In such case, the bus is released from stall only after the in npcm_i2c_irq_handle_nack()
1513 npcm_i2c_callback(bus, bus->stop_ind, bus->wr_ind); in npcm_i2c_irq_handle_nack()
1516 /* Master mode: a Bus Error has been identified */
1517 static void npcm_i2c_irq_handle_ber(struct npcm_i2c *bus) in npcm_i2c_irq_handle_ber() argument
1519 if (bus->ber_cnt < ULLONG_MAX) in npcm_i2c_irq_handle_ber()
1520 bus->ber_cnt++; in npcm_i2c_irq_handle_ber()
1521 bus->stop_ind = I2C_BUS_ERR_IND; in npcm_i2c_irq_handle_ber()
1522 if (npcm_i2c_is_master(bus)) { in npcm_i2c_irq_handle_ber()
1523 npcm_i2c_master_abort(bus); in npcm_i2c_irq_handle_ber()
1525 npcm_i2c_clear_master_status(bus); in npcm_i2c_irq_handle_ber()
1527 /* Clear BB (BUS BUSY) bit */ in npcm_i2c_irq_handle_ber()
1528 iowrite8(NPCM_I2CCST_BB, bus->reg + NPCM_I2CCST); in npcm_i2c_irq_handle_ber()
1530 bus->cmd_err = -EAGAIN; in npcm_i2c_irq_handle_ber()
1531 npcm_i2c_callback(bus, bus->stop_ind, npcm_i2c_get_index(bus)); in npcm_i2c_irq_handle_ber()
1533 bus->state = I2C_IDLE; in npcm_i2c_irq_handle_ber()
1537 static void npcm_i2c_irq_handle_eob(struct npcm_i2c *bus) in npcm_i2c_irq_handle_eob() argument
1539 npcm_i2c_eob_int(bus, false); in npcm_i2c_irq_handle_eob()
1540 bus->state = I2C_IDLE; in npcm_i2c_irq_handle_eob()
1541 npcm_i2c_callback(bus, bus->stop_ind, bus->rd_ind); in npcm_i2c_irq_handle_eob()
1545 static void npcm_i2c_irq_handle_stall_after_start(struct npcm_i2c *bus) in npcm_i2c_irq_handle_stall_after_start() argument
1547 if (npcm_i2c_is_quick(bus)) { in npcm_i2c_irq_handle_stall_after_start()
1548 bus->state = I2C_STOP_PENDING; in npcm_i2c_irq_handle_stall_after_start()
1549 bus->stop_ind = I2C_MASTER_DONE_IND; in npcm_i2c_irq_handle_stall_after_start()
1550 npcm_i2c_eob_int(bus, true); in npcm_i2c_irq_handle_stall_after_start()
1551 npcm_i2c_master_stop(bus); in npcm_i2c_irq_handle_stall_after_start()
1552 } else if ((bus->rd_size == 1) && !bus->read_block_use) { in npcm_i2c_irq_handle_stall_after_start()
1557 npcm_i2c_nack(bus); in npcm_i2c_irq_handle_stall_after_start()
1561 npcm_i2c_stall_after_start(bus, false); in npcm_i2c_irq_handle_stall_after_start()
1564 iowrite8(NPCM_I2CST_STASTR, bus->reg + NPCM_I2CST); in npcm_i2c_irq_handle_stall_after_start()
1568 static void npcm_i2c_irq_handle_sda(struct npcm_i2c *bus, u8 i2cst) in npcm_i2c_irq_handle_sda() argument
1572 if (!npcm_i2c_is_master(bus)) in npcm_i2c_irq_handle_sda()
1575 if (bus->state == I2C_IDLE) { in npcm_i2c_irq_handle_sda()
1576 bus->stop_ind = I2C_WAKE_UP_IND; in npcm_i2c_irq_handle_sda()
1578 if (npcm_i2c_is_quick(bus) || bus->read_block_use) in npcm_i2c_irq_handle_sda()
1583 npcm_i2c_stall_after_start(bus, true); in npcm_i2c_irq_handle_sda()
1585 npcm_i2c_stall_after_start(bus, false); in npcm_i2c_irq_handle_sda()
1593 if (bus->wr_size == 0 && bus->rd_size == 1) in npcm_i2c_irq_handle_sda()
1594 npcm_i2c_stall_after_start(bus, true); in npcm_i2c_irq_handle_sda()
1599 npcm_i2c_select_bank(bus, I2C_BANK_1); in npcm_i2c_irq_handle_sda()
1601 fif_cts = ioread8(bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_irq_handle_sda()
1606 iowrite8(fif_cts, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_irq_handle_sda()
1610 iowrite8(fif_cts, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_irq_handle_sda()
1619 if (bus->wr_size) in npcm_i2c_irq_handle_sda()
1620 npcm_i2c_set_fifo(bus, -1, bus->wr_size); in npcm_i2c_irq_handle_sda()
1622 npcm_i2c_set_fifo(bus, bus->rd_size, -1); in npcm_i2c_irq_handle_sda()
1624 bus->state = I2C_OPER_STARTED; in npcm_i2c_irq_handle_sda()
1626 if (npcm_i2c_is_quick(bus) || bus->wr_size) in npcm_i2c_irq_handle_sda()
1627 npcm_i2c_wr_byte(bus, bus->dest_addr); in npcm_i2c_irq_handle_sda()
1629 npcm_i2c_wr_byte(bus, bus->dest_addr | BIT(0)); in npcm_i2c_irq_handle_sda()
1633 bus->operation = I2C_WRITE_OPER; in npcm_i2c_irq_handle_sda()
1634 npcm_i2c_irq_master_handler_write(bus); in npcm_i2c_irq_handle_sda()
1636 bus->operation = I2C_READ_OPER; in npcm_i2c_irq_handle_sda()
1637 npcm_i2c_irq_master_handler_read(bus); in npcm_i2c_irq_handle_sda()
1642 static int npcm_i2c_int_master_handler(struct npcm_i2c *bus) in npcm_i2c_int_master_handler() argument
1647 i2cst = ioread8(bus->reg + NPCM_I2CST); in npcm_i2c_int_master_handler()
1650 npcm_i2c_irq_handle_nmatch(bus); in npcm_i2c_int_master_handler()
1655 npcm_i2c_irq_handle_nack(bus); in npcm_i2c_int_master_handler()
1659 /* Master mode: a Bus Error has been identified */ in npcm_i2c_int_master_handler()
1661 npcm_i2c_irq_handle_ber(bus); in npcm_i2c_int_master_handler()
1667 ioread8(bus->reg + NPCM_I2CCTL1)) == 1) && in npcm_i2c_int_master_handler()
1669 ioread8(bus->reg + NPCM_I2CCST3)))) { in npcm_i2c_int_master_handler()
1670 npcm_i2c_irq_handle_eob(bus); in npcm_i2c_int_master_handler()
1676 npcm_i2c_irq_handle_stall_after_start(bus); in npcm_i2c_int_master_handler()
1682 (bus->fifo_use && in npcm_i2c_int_master_handler()
1683 (npcm_i2c_tx_fifo_empty(bus) || npcm_i2c_rx_fifo_full(bus)))) { in npcm_i2c_int_master_handler()
1684 npcm_i2c_irq_handle_sda(bus, i2cst); in npcm_i2c_int_master_handler()
1698 struct npcm_i2c *bus = container_of(_adap, struct npcm_i2c, adap); in npcm_i2c_recovery_tgclk() local
1703 dev_dbg(bus->dev, "bus%d-0x%x recovery skipped, bus not stuck", in npcm_i2c_recovery_tgclk()
1704 bus->num, bus->dest_addr); in npcm_i2c_recovery_tgclk()
1705 npcm_i2c_reset(bus); in npcm_i2c_recovery_tgclk()
1709 npcm_i2c_int_enable(bus, false); in npcm_i2c_recovery_tgclk()
1710 npcm_i2c_disable(bus); in npcm_i2c_recovery_tgclk()
1711 npcm_i2c_enable(bus); in npcm_i2c_recovery_tgclk()
1712 iowrite8(NPCM_I2CCST_BB, bus->reg + NPCM_I2CCST); in npcm_i2c_recovery_tgclk()
1713 npcm_i2c_clear_tx_fifo(bus); in npcm_i2c_recovery_tgclk()
1714 npcm_i2c_clear_rx_fifo(bus); in npcm_i2c_recovery_tgclk()
1715 iowrite8(0, bus->reg + NPCM_I2CRXF_CTL); in npcm_i2c_recovery_tgclk()
1716 iowrite8(0, bus->reg + NPCM_I2CTXF_CTL); in npcm_i2c_recovery_tgclk()
1717 npcm_i2c_stall_after_start(bus, false); in npcm_i2c_recovery_tgclk()
1720 npcm_i2c_select_bank(bus, I2C_BANK_1); in npcm_i2c_recovery_tgclk()
1723 fif_cts = ioread8(bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_recovery_tgclk()
1726 iowrite8(fif_cts, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_recovery_tgclk()
1727 npcm_i2c_set_fifo(bus, -1, 0); in npcm_i2c_recovery_tgclk()
1732 iowrite8(NPCM_I2CCST_TGSCL, bus->reg + NPCM_I2CCST); in npcm_i2c_recovery_tgclk()
1744 npcm_i2c_wr_byte(bus, bus->dest_addr); in npcm_i2c_recovery_tgclk()
1745 npcm_i2c_master_start(bus); in npcm_i2c_recovery_tgclk()
1750 if (npcm_i2c_is_master(bus) > 0) { in npcm_i2c_recovery_tgclk()
1752 npcm_i2c_master_stop(bus); in npcm_i2c_recovery_tgclk()
1756 npcm_i2c_reset(bus); in npcm_i2c_recovery_tgclk()
1757 npcm_i2c_int_enable(bus, true); in npcm_i2c_recovery_tgclk()
1764 if (bus->rec_fail_cnt < ULLONG_MAX) in npcm_i2c_recovery_tgclk()
1765 bus->rec_fail_cnt++; in npcm_i2c_recovery_tgclk()
1767 if (bus->rec_succ_cnt < ULLONG_MAX) in npcm_i2c_recovery_tgclk()
1768 bus->rec_succ_cnt++; in npcm_i2c_recovery_tgclk()
1776 struct npcm_i2c *bus = container_of(_adap, struct npcm_i2c, adap); in npcm_i2c_recovery_init() local
1777 struct i2c_bus_recovery_info *rinfo = &bus->rinfo; in npcm_i2c_recovery_init()
1800 * and bus frequency.
1801 * 100kHz bus requires tSCL = 4 * SCLFRQ * tCLK. LT and HT are symmetric.
1802 * 400kHz bus requires asymmetric HT and LT. A different equation is recommended
1806 static int npcm_i2c_init_clk(struct npcm_i2c *bus, u32 bus_freq_hz) in npcm_i2c_init_clk() argument
1817 src_clk_khz = bus->apb_clk / 1000; in npcm_i2c_init_clk()
1819 bus->bus_freq = bus_freq_hz; in npcm_i2c_init_clk()
1900 bus->reg + NPCM_I2CCTL2); in npcm_i2c_init_clk()
1904 bus->reg + NPCM_I2CCTL3); in npcm_i2c_init_clk()
1907 npcm_i2c_select_bank(bus, I2C_BANK_0); in npcm_i2c_init_clk()
1915 iowrite8(k1 / 2, bus->reg + NPCM_I2CSCLLT); in npcm_i2c_init_clk()
1916 iowrite8(k2 / 2, bus->reg + NPCM_I2CSCLHT); in npcm_i2c_init_clk()
1918 iowrite8(dbnct, bus->reg + NPCM_I2CCTL5); in npcm_i2c_init_clk()
1921 iowrite8(hldt, bus->reg + NPCM_I2CCTL4); in npcm_i2c_init_clk()
1924 npcm_i2c_select_bank(bus, I2C_BANK_1); in npcm_i2c_init_clk()
1929 static int npcm_i2c_init_module(struct npcm_i2c *bus, enum i2c_mode mode, in npcm_i2c_init_module() argument
1936 if ((bus->state != I2C_DISABLE && bus->state != I2C_IDLE) || in npcm_i2c_init_module()
1940 npcm_i2c_int_enable(bus, false); in npcm_i2c_init_module()
1941 npcm_i2c_disable(bus); in npcm_i2c_init_module()
1944 if (FIELD_GET(I2C_VER_FIFO_EN, ioread8(bus->reg + I2C_VER))) { in npcm_i2c_init_module()
1945 bus->fifo_use = true; in npcm_i2c_init_module()
1946 npcm_i2c_select_bank(bus, I2C_BANK_0); in npcm_i2c_init_module()
1947 val = ioread8(bus->reg + NPCM_I2CFIF_CTL); in npcm_i2c_init_module()
1949 iowrite8(val, bus->reg + NPCM_I2CFIF_CTL); in npcm_i2c_init_module()
1950 npcm_i2c_select_bank(bus, I2C_BANK_1); in npcm_i2c_init_module()
1952 bus->fifo_use = false; in npcm_i2c_init_module()
1956 ret = npcm_i2c_init_clk(bus, bus_freq_hz); in npcm_i2c_init_module()
1958 dev_err(bus->dev, "npcm_i2c_init_clk failed\n"); in npcm_i2c_init_module()
1963 npcm_i2c_enable(bus); in npcm_i2c_init_module()
1964 bus->state = I2C_IDLE; in npcm_i2c_init_module()
1965 val = ioread8(bus->reg + NPCM_I2CCTL1); in npcm_i2c_init_module()
1967 iowrite8(val, bus->reg + NPCM_I2CCTL1); in npcm_i2c_init_module()
1969 npcm_i2c_reset(bus); in npcm_i2c_init_module()
1972 if ((npcm_i2c_get_SDA(&bus->adap) == 0) || (npcm_i2c_get_SCL(&bus->adap) == 0)) { in npcm_i2c_init_module()
1973 dev_err(bus->dev, "I2C%d init fail: lines are low\n", bus->num); in npcm_i2c_init_module()
1974 dev_err(bus->dev, "SDA=%d SCL=%d\n", npcm_i2c_get_SDA(&bus->adap), in npcm_i2c_init_module()
1975 npcm_i2c_get_SCL(&bus->adap)); in npcm_i2c_init_module()
1979 npcm_i2c_int_enable(bus, true); in npcm_i2c_init_module()
1983 static int __npcm_i2c_init(struct npcm_i2c *bus, struct platform_device *pdev) in __npcm_i2c_init() argument
1989 bus->state = I2C_DISABLE; in __npcm_i2c_init()
1990 bus->master_or_slave = I2C_SLAVE; in __npcm_i2c_init()
1991 bus->int_time_stamp = 0; in __npcm_i2c_init()
1993 bus->slave = NULL; in __npcm_i2c_init()
2003 ret = npcm_i2c_init_module(bus, I2C_MASTER, clk_freq_hz); in __npcm_i2c_init()
2014 struct npcm_i2c *bus = dev_id; in npcm_i2c_bus_irq() local
2016 if (npcm_i2c_is_master(bus)) in npcm_i2c_bus_irq()
2017 bus->master_or_slave = I2C_MASTER; in npcm_i2c_bus_irq()
2019 if (bus->master_or_slave == I2C_MASTER) { in npcm_i2c_bus_irq()
2020 bus->int_time_stamp = jiffies; in npcm_i2c_bus_irq()
2021 if (!npcm_i2c_int_master_handler(bus)) in npcm_i2c_bus_irq()
2025 if (bus->slave) { in npcm_i2c_bus_irq()
2026 bus->master_or_slave = I2C_SLAVE; in npcm_i2c_bus_irq()
2027 if (npcm_i2c_int_slave_handler(bus)) in npcm_i2c_bus_irq()
2032 npcm_i2c_clear_master_status(bus); in npcm_i2c_bus_irq()
2037 static bool npcm_i2c_master_start_xmit(struct npcm_i2c *bus, in npcm_i2c_master_start_xmit() argument
2042 if (bus->state != I2C_IDLE) { in npcm_i2c_master_start_xmit()
2043 bus->cmd_err = -EBUSY; in npcm_i2c_master_start_xmit()
2046 bus->dest_addr = slave_addr << 1; in npcm_i2c_master_start_xmit()
2047 bus->wr_buf = write_data; in npcm_i2c_master_start_xmit()
2048 bus->wr_size = nwrite; in npcm_i2c_master_start_xmit()
2049 bus->wr_ind = 0; in npcm_i2c_master_start_xmit()
2050 bus->rd_buf = read_data; in npcm_i2c_master_start_xmit()
2051 bus->rd_size = nread; in npcm_i2c_master_start_xmit()
2052 bus->rd_ind = 0; in npcm_i2c_master_start_xmit()
2053 bus->PEC_use = 0; in npcm_i2c_master_start_xmit()
2057 bus->PEC_use = use_PEC; in npcm_i2c_master_start_xmit()
2059 bus->read_block_use = use_read_block; in npcm_i2c_master_start_xmit()
2061 bus->operation = I2C_READ_OPER; in npcm_i2c_master_start_xmit()
2063 bus->operation = I2C_WRITE_OPER; in npcm_i2c_master_start_xmit()
2064 if (bus->fifo_use) { in npcm_i2c_master_start_xmit()
2067 npcm_i2c_select_bank(bus, I2C_BANK_1); in npcm_i2c_master_start_xmit()
2069 i2cfif_cts = ioread8(bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_master_start_xmit()
2072 iowrite8(i2cfif_cts, bus->reg + NPCM_I2CFIF_CTS); in npcm_i2c_master_start_xmit()
2075 bus->state = I2C_IDLE; in npcm_i2c_master_start_xmit()
2076 npcm_i2c_stall_after_start(bus, true); in npcm_i2c_master_start_xmit()
2077 npcm_i2c_master_start(bus); in npcm_i2c_master_start_xmit()
2084 struct npcm_i2c *bus = container_of(adap, struct npcm_i2c, adap); in npcm_i2c_master_xfer() local
2096 if (bus->state == I2C_DISABLE) { in npcm_i2c_master_xfer()
2097 dev_err(bus->dev, "I2C%d module is disabled", bus->num); in npcm_i2c_master_xfer()
2140 timeout_usec = (2 * 9 * USEC_PER_SEC / bus->bus_freq) * (2 + nread + nwrite); in npcm_i2c_master_xfer()
2141 timeout = max_t(unsigned long, bus->adap.timeout, usecs_to_jiffies(timeout_usec)); in npcm_i2c_master_xfer()
2143 dev_err(bus->dev, "i2c%d buffer too big\n", bus->num); in npcm_i2c_master_xfer()
2150 * we must clear slave address immediately when the bus is not in npcm_i2c_master_xfer()
2154 spin_lock_irqsave(&bus->lock, flags); in npcm_i2c_master_xfer()
2155 bus_busy = ioread8(bus->reg + NPCM_I2CCST) & NPCM_I2CCST_BB; in npcm_i2c_master_xfer()
2157 if (!bus_busy && bus->slave) in npcm_i2c_master_xfer()
2158 iowrite8((bus->slave->addr & 0x7F), in npcm_i2c_master_xfer()
2159 bus->reg + NPCM_I2CADDR1); in npcm_i2c_master_xfer()
2161 spin_unlock_irqrestore(&bus->lock, flags); in npcm_i2c_master_xfer()
2166 iowrite8(NPCM_I2CCST_BB, bus->reg + NPCM_I2CCST); in npcm_i2c_master_xfer()
2167 npcm_i2c_reset(bus); in npcm_i2c_master_xfer()
2172 npcm_i2c_init_params(bus); in npcm_i2c_master_xfer()
2173 bus->dest_addr = slave_addr; in npcm_i2c_master_xfer()
2174 bus->msgs = msgs; in npcm_i2c_master_xfer()
2175 bus->msgs_num = num; in npcm_i2c_master_xfer()
2176 bus->cmd_err = 0; in npcm_i2c_master_xfer()
2177 bus->read_block_use = read_block; in npcm_i2c_master_xfer()
2179 reinit_completion(&bus->cmd_complete); in npcm_i2c_master_xfer()
2181 npcm_i2c_int_enable(bus, true); in npcm_i2c_master_xfer()
2183 if (npcm_i2c_master_start_xmit(bus, slave_addr, nwrite, nread, in npcm_i2c_master_xfer()
2186 time_left = wait_for_completion_timeout(&bus->cmd_complete, in npcm_i2c_master_xfer()
2190 if (bus->timeout_cnt < ULLONG_MAX) in npcm_i2c_master_xfer()
2191 bus->timeout_cnt++; in npcm_i2c_master_xfer()
2192 if (bus->master_or_slave == I2C_MASTER) { in npcm_i2c_master_xfer()
2194 bus->cmd_err = -EIO; in npcm_i2c_master_xfer()
2195 bus->state = I2C_IDLE; in npcm_i2c_master_xfer()
2200 /* if there was BER, check if need to recover the bus: */ in npcm_i2c_master_xfer()
2201 if (bus->cmd_err == -EAGAIN) in npcm_i2c_master_xfer()
2202 bus->cmd_err = i2c_recover_bus(adap); in npcm_i2c_master_xfer()
2209 else if (bus->cmd_err && in npcm_i2c_master_xfer()
2210 (bus->data->rxf_ctl_last_pec & ioread8(bus->reg + NPCM_I2CRXF_CTL))) in npcm_i2c_master_xfer()
2211 npcm_i2c_reset(bus); in npcm_i2c_master_xfer()
2214 npcm_i2c_stall_after_start(bus, false); in npcm_i2c_master_xfer()
2215 npcm_i2c_eob_int(bus, false); in npcm_i2c_master_xfer()
2219 if (bus->slave) in npcm_i2c_master_xfer()
2220 iowrite8((bus->slave->addr & 0x7F) | NPCM_I2CADDR_SAEN, in npcm_i2c_master_xfer()
2221 bus->reg + NPCM_I2CADDR1); in npcm_i2c_master_xfer()
2223 npcm_i2c_int_enable(bus, false); in npcm_i2c_master_xfer()
2225 return bus->cmd_err; in npcm_i2c_master_xfer()
2253 struct npcm_i2c *bus) in npcm_i2c_init_debugfs() argument
2255 debugfs_create_u64("ber_cnt", 0444, bus->adap.debugfs, &bus->ber_cnt); in npcm_i2c_init_debugfs()
2256 debugfs_create_u64("nack_cnt", 0444, bus->adap.debugfs, &bus->nack_cnt); in npcm_i2c_init_debugfs()
2257 debugfs_create_u64("rec_succ_cnt", 0444, bus->adap.debugfs, &bus->rec_succ_cnt); in npcm_i2c_init_debugfs()
2258 debugfs_create_u64("rec_fail_cnt", 0444, bus->adap.debugfs, &bus->rec_fail_cnt); in npcm_i2c_init_debugfs()
2259 debugfs_create_u64("timeout_cnt", 0444, bus->adap.debugfs, &bus->timeout_cnt); in npcm_i2c_init_debugfs()
2260 debugfs_create_u64("tx_complete_cnt", 0444, bus->adap.debugfs, &bus->tx_complete_cnt); in npcm_i2c_init_debugfs()
2269 struct npcm_i2c *bus; in npcm_i2c_probe_bus() local
2274 bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL); in npcm_i2c_probe_bus()
2275 if (!bus) in npcm_i2c_probe_bus()
2278 bus->dev = &pdev->dev; in npcm_i2c_probe_bus()
2280 bus->data = of_device_get_match_data(dev); in npcm_i2c_probe_bus()
2281 if (!bus->data) { in npcm_i2c_probe_bus()
2286 bus->num = of_alias_get_id(pdev->dev.of_node, "i2c"); in npcm_i2c_probe_bus()
2291 bus->apb_clk = clk_get_rate(i2c_clk); in npcm_i2c_probe_bus()
2299 regmap_write(gcr_regmap, NPCM_I2CSEGCTL, bus->data->segctl_init_val); in npcm_i2c_probe_bus()
2301 bus->reg = devm_platform_ioremap_resource(pdev, 0); in npcm_i2c_probe_bus()
2302 if (IS_ERR(bus->reg)) in npcm_i2c_probe_bus()
2303 return PTR_ERR(bus->reg); in npcm_i2c_probe_bus()
2305 spin_lock_init(&bus->lock); in npcm_i2c_probe_bus()
2306 init_completion(&bus->cmd_complete); in npcm_i2c_probe_bus()
2308 adap = &bus->adap; in npcm_i2c_probe_bus()
2314 adap->algo_data = bus; in npcm_i2c_probe_bus()
2323 ret = devm_request_irq(bus->dev, irq, npcm_i2c_bus_irq, 0, in npcm_i2c_probe_bus()
2324 dev_name(bus->dev), bus); in npcm_i2c_probe_bus()
2328 ret = __npcm_i2c_init(bus, pdev); in npcm_i2c_probe_bus()
2334 i2c_set_adapdata(adap, bus); in npcm_i2c_probe_bus()
2336 snprintf(bus->adap.name, sizeof(bus->adap.name), "npcm_i2c_%d", in npcm_i2c_probe_bus()
2337 bus->num); in npcm_i2c_probe_bus()
2338 ret = i2c_add_numbered_adapter(&bus->adap); in npcm_i2c_probe_bus()
2342 platform_set_drvdata(pdev, bus); in npcm_i2c_probe_bus()
2343 npcm_i2c_init_debugfs(pdev, bus); in npcm_i2c_probe_bus()
2350 struct npcm_i2c *bus = platform_get_drvdata(pdev); in npcm_i2c_remove_bus() local
2352 spin_lock_irqsave(&bus->lock, lock_flags); in npcm_i2c_remove_bus()
2353 npcm_i2c_disable(bus); in npcm_i2c_remove_bus()
2354 spin_unlock_irqrestore(&bus->lock, lock_flags); in npcm_i2c_remove_bus()
2355 i2c_del_adapter(&bus->adap); in npcm_i2c_remove_bus()
2379 MODULE_DESCRIPTION("Nuvoton I2C Bus Driver");