Lines Matching refs:i2c
111 void (*setup)(struct device_node *node, struct mpc_i2c *i2c, u32 clock);
114 static inline void writeccr(struct mpc_i2c *i2c, u32 x) in writeccr() argument
116 writeb(x, i2c->base + MPC_I2C_CR); in writeccr()
124 static void mpc_i2c_fixup(struct mpc_i2c *i2c) in mpc_i2c_fixup() argument
127 u32 delay_val = 1000000 / i2c->real_clk + 1; in mpc_i2c_fixup()
133 writeccr(i2c, 0); in mpc_i2c_fixup()
134 writeccr(i2c, CCR_MSTA | CCR_MTX | CCR_MEN); in mpc_i2c_fixup()
135 readb(i2c->base + MPC_I2C_DR); in mpc_i2c_fixup()
136 writeccr(i2c, CCR_MEN); in mpc_i2c_fixup()
141 static int i2c_mpc_wait_sr(struct mpc_i2c *i2c, int mask) in i2c_mpc_wait_sr() argument
143 void __iomem *addr = i2c->base + MPC_I2C_SR; in i2c_mpc_wait_sr()
169 static void mpc_i2c_fixup_A004447(struct mpc_i2c *i2c) in mpc_i2c_fixup_A004447() argument
174 writeccr(i2c, CCR_MEN | CCR_MSTA); in mpc_i2c_fixup_A004447()
175 ret = i2c_mpc_wait_sr(i2c, CSR_MBB); in mpc_i2c_fixup_A004447()
177 dev_err(i2c->dev, "timeout waiting for CSR_MBB\n"); in mpc_i2c_fixup_A004447()
181 val = readb(i2c->base + MPC_I2C_SR); in mpc_i2c_fixup_A004447()
184 writeccr(i2c, 0x00); in mpc_i2c_fixup_A004447()
185 writeccr(i2c, CCR_MSTA | CCR_RSVD); in mpc_i2c_fixup_A004447()
186 writeccr(i2c, CCR_MEN | CCR_MSTA | CCR_RSVD); in mpc_i2c_fixup_A004447()
187 ret = i2c_mpc_wait_sr(i2c, CSR_MBB); in mpc_i2c_fixup_A004447()
189 dev_err(i2c->dev, "timeout waiting for CSR_MBB\n"); in mpc_i2c_fixup_A004447()
192 val = readb(i2c->base + MPC_I2C_DR); in mpc_i2c_fixup_A004447()
193 ret = i2c_mpc_wait_sr(i2c, CSR_MIF); in mpc_i2c_fixup_A004447()
195 dev_err(i2c->dev, "timeout waiting for CSR_MIF\n"); in mpc_i2c_fixup_A004447()
198 writeccr(i2c, CCR_MEN | CCR_RSVD); in mpc_i2c_fixup_A004447()
200 val = readb(i2c->base + MPC_I2C_DR); in mpc_i2c_fixup_A004447()
201 ret = i2c_mpc_wait_sr(i2c, CSR_MIF); in mpc_i2c_fixup_A004447()
203 dev_err(i2c->dev, "timeout waiting for CSR_MIF\n"); in mpc_i2c_fixup_A004447()
206 writeccr(i2c, CCR_MEN); in mpc_i2c_fixup_A004447()
267 struct mpc_i2c *i2c, in mpc_i2c_setup_52xx() argument
273 dev_dbg(i2c->dev, "using fdr %d\n", in mpc_i2c_setup_52xx()
274 readb(i2c->base + MPC_I2C_FDR)); in mpc_i2c_setup_52xx()
278 ret = mpc_i2c_get_fdr_52xx(node, clock, &i2c->real_clk); in mpc_i2c_setup_52xx()
281 writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR); in mpc_i2c_setup_52xx()
284 dev_info(i2c->dev, "clock %u Hz (fdr=%d)\n", i2c->real_clk, in mpc_i2c_setup_52xx()
289 struct mpc_i2c *i2c, in mpc_i2c_setup_52xx() argument
297 struct mpc_i2c *i2c, in mpc_i2c_setup_512x() argument
321 mpc_i2c_setup_52xx(node, i2c, clock); in mpc_i2c_setup_512x()
325 struct mpc_i2c *i2c, in mpc_i2c_setup_512x() argument
453 struct mpc_i2c *i2c, in mpc_i2c_setup_8xxx() argument
459 dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n", in mpc_i2c_setup_8xxx()
460 readb(i2c->base + MPC_I2C_DFSRR), in mpc_i2c_setup_8xxx()
461 readb(i2c->base + MPC_I2C_FDR)); in mpc_i2c_setup_8xxx()
465 ret = mpc_i2c_get_fdr_8xxx(node, clock, &i2c->real_clk); in mpc_i2c_setup_8xxx()
468 writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR); in mpc_i2c_setup_8xxx()
469 writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR); in mpc_i2c_setup_8xxx()
472 dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n", in mpc_i2c_setup_8xxx()
473 i2c->real_clk, fdr >> 8, fdr & 0xff); in mpc_i2c_setup_8xxx()
478 struct mpc_i2c *i2c, in mpc_i2c_setup_8xxx() argument
484 static void mpc_i2c_finish(struct mpc_i2c *i2c, int rc) in mpc_i2c_finish() argument
486 i2c->rc = rc; in mpc_i2c_finish()
487 i2c->block = 0; in mpc_i2c_finish()
488 i2c->cntl_bits = CCR_MEN; in mpc_i2c_finish()
489 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_finish()
490 wake_up(&i2c->waitq); in mpc_i2c_finish()
493 static void mpc_i2c_do_action(struct mpc_i2c *i2c) in mpc_i2c_do_action() argument
500 dev_dbg(i2c->dev, "action = %s\n", action_str[i2c->action]); in mpc_i2c_do_action()
502 i2c->cntl_bits &= ~(CCR_RSTA | CCR_MTX | CCR_TXAK); in mpc_i2c_do_action()
504 if (i2c->action != MPC_I2C_ACTION_STOP) { in mpc_i2c_do_action()
505 msg = &i2c->msgs[i2c->curr_msg]; in mpc_i2c_do_action()
512 switch (i2c->action) { in mpc_i2c_do_action()
514 i2c->cntl_bits |= CCR_RSTA; in mpc_i2c_do_action()
518 i2c->cntl_bits |= CCR_MSTA | CCR_MTX; in mpc_i2c_do_action()
519 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_do_action()
520 writeb((msg->addr << 1) | dir, i2c->base + MPC_I2C_DR); in mpc_i2c_do_action()
521 i2c->expect_rxack = 1; in mpc_i2c_do_action()
522 i2c->action = dir ? MPC_I2C_ACTION_READ_BEGIN : MPC_I2C_ACTION_WRITE; in mpc_i2c_do_action()
528 i2c->cntl_bits |= CCR_TXAK; in mpc_i2c_do_action()
530 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_do_action()
532 readb(i2c->base + MPC_I2C_DR); in mpc_i2c_do_action()
534 i2c->action = MPC_I2C_ACTION_READ_BYTE; in mpc_i2c_do_action()
538 if (i2c->byte_posn || !recv_len) { in mpc_i2c_do_action()
540 if (i2c->byte_posn == msg->len - 2) in mpc_i2c_do_action()
541 i2c->cntl_bits |= CCR_TXAK; in mpc_i2c_do_action()
543 if (i2c->byte_posn == msg->len - 1) in mpc_i2c_do_action()
544 i2c->cntl_bits |= CCR_MTX; in mpc_i2c_do_action()
546 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_do_action()
549 byte = readb(i2c->base + MPC_I2C_DR); in mpc_i2c_do_action()
551 if (i2c->byte_posn == 0 && recv_len) { in mpc_i2c_do_action()
553 mpc_i2c_finish(i2c, -EPROTO); in mpc_i2c_do_action()
562 i2c->cntl_bits |= CCR_TXAK; in mpc_i2c_do_action()
563 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_do_action()
567 dev_dbg(i2c->dev, "%s %02x\n", action_str[i2c->action], byte); in mpc_i2c_do_action()
568 msg->buf[i2c->byte_posn++] = byte; in mpc_i2c_do_action()
572 dev_dbg(i2c->dev, "%s %02x\n", action_str[i2c->action], in mpc_i2c_do_action()
573 msg->buf[i2c->byte_posn]); in mpc_i2c_do_action()
574 writeb(msg->buf[i2c->byte_posn++], i2c->base + MPC_I2C_DR); in mpc_i2c_do_action()
575 i2c->expect_rxack = 1; in mpc_i2c_do_action()
579 mpc_i2c_finish(i2c, 0); in mpc_i2c_do_action()
583 WARN(1, "Unexpected action %d\n", i2c->action); in mpc_i2c_do_action()
587 if (msg && msg->len == i2c->byte_posn) { in mpc_i2c_do_action()
588 i2c->curr_msg++; in mpc_i2c_do_action()
589 i2c->byte_posn = 0; in mpc_i2c_do_action()
591 if (i2c->curr_msg == i2c->num_msgs) { in mpc_i2c_do_action()
592 i2c->action = MPC_I2C_ACTION_STOP; in mpc_i2c_do_action()
598 mpc_i2c_finish(i2c, 0); in mpc_i2c_do_action()
600 i2c->action = MPC_I2C_ACTION_RESTART; in mpc_i2c_do_action()
605 static void mpc_i2c_do_intr(struct mpc_i2c *i2c, u8 status) in mpc_i2c_do_intr() argument
607 spin_lock(&i2c->lock); in mpc_i2c_do_intr()
610 dev_dbg(i2c->dev, "unfinished\n"); in mpc_i2c_do_intr()
611 mpc_i2c_finish(i2c, -EIO); in mpc_i2c_do_intr()
616 dev_dbg(i2c->dev, "arbitration lost\n"); in mpc_i2c_do_intr()
617 mpc_i2c_finish(i2c, -EAGAIN); in mpc_i2c_do_intr()
621 if (i2c->expect_rxack && (status & CSR_RXAK)) { in mpc_i2c_do_intr()
622 dev_dbg(i2c->dev, "no Rx ACK\n"); in mpc_i2c_do_intr()
623 mpc_i2c_finish(i2c, -ENXIO); in mpc_i2c_do_intr()
626 i2c->expect_rxack = 0; in mpc_i2c_do_intr()
628 mpc_i2c_do_action(i2c); in mpc_i2c_do_intr()
631 spin_unlock(&i2c->lock); in mpc_i2c_do_intr()
636 struct mpc_i2c *i2c = dev_id; in mpc_i2c_isr() local
639 status = readb(i2c->base + MPC_I2C_SR); in mpc_i2c_isr()
642 readb_poll_timeout_atomic(i2c->base + MPC_I2C_SR, status, status & CSR_MCF, 0, 100); in mpc_i2c_isr()
643 writeb(0, i2c->base + MPC_I2C_SR); in mpc_i2c_isr()
644 mpc_i2c_do_intr(i2c, status); in mpc_i2c_isr()
650 static int mpc_i2c_wait_for_completion(struct mpc_i2c *i2c) in mpc_i2c_wait_for_completion() argument
654 time_left = wait_event_timeout(i2c->waitq, !i2c->block, i2c->adap.timeout); in mpc_i2c_wait_for_completion()
663 static int mpc_i2c_execute_msg(struct mpc_i2c *i2c) in mpc_i2c_execute_msg() argument
669 spin_lock_irqsave(&i2c->lock, flags); in mpc_i2c_execute_msg()
671 i2c->curr_msg = 0; in mpc_i2c_execute_msg()
672 i2c->rc = 0; in mpc_i2c_execute_msg()
673 i2c->byte_posn = 0; in mpc_i2c_execute_msg()
674 i2c->block = 1; in mpc_i2c_execute_msg()
675 i2c->action = MPC_I2C_ACTION_START; in mpc_i2c_execute_msg()
677 i2c->cntl_bits = CCR_MEN | CCR_MIEN; in mpc_i2c_execute_msg()
678 writeb(0, i2c->base + MPC_I2C_SR); in mpc_i2c_execute_msg()
679 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_execute_msg()
681 mpc_i2c_do_action(i2c); in mpc_i2c_execute_msg()
683 spin_unlock_irqrestore(&i2c->lock, flags); in mpc_i2c_execute_msg()
685 ret = mpc_i2c_wait_for_completion(i2c); in mpc_i2c_execute_msg()
687 i2c->rc = ret; in mpc_i2c_execute_msg()
689 if (i2c->rc == -EIO || i2c->rc == -EAGAIN || i2c->rc == -ETIMEDOUT) in mpc_i2c_execute_msg()
690 i2c_recover_bus(&i2c->adap); in mpc_i2c_execute_msg()
694 while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) { in mpc_i2c_execute_msg()
696 u8 status = readb(i2c->base + MPC_I2C_SR); in mpc_i2c_execute_msg()
698 dev_dbg(i2c->dev, "timeout\n"); in mpc_i2c_execute_msg()
701 i2c->base + MPC_I2C_SR); in mpc_i2c_execute_msg()
702 i2c_recover_bus(&i2c->adap); in mpc_i2c_execute_msg()
709 return i2c->rc; in mpc_i2c_execute_msg()
715 struct mpc_i2c *i2c = i2c_get_adapdata(adap); in mpc_xfer() local
718 dev_dbg(i2c->dev, "num = %d\n", num); in mpc_xfer()
720 dev_dbg(i2c->dev, " addr = %02x, flags = %02x, len = %d, %*ph\n", in mpc_xfer()
725 WARN_ON(i2c->msgs != NULL); in mpc_xfer()
726 i2c->msgs = msgs; in mpc_xfer()
727 i2c->num_msgs = num; in mpc_xfer()
729 rc = mpc_i2c_execute_msg(i2c); in mpc_xfer()
733 i2c->num_msgs = 0; in mpc_xfer()
734 i2c->msgs = NULL; in mpc_xfer()
747 struct mpc_i2c *i2c = i2c_get_adapdata(adap); in fsl_i2c_bus_recovery() local
749 if (i2c->has_errata_A004447) in fsl_i2c_bus_recovery()
750 mpc_i2c_fixup_A004447(i2c); in fsl_i2c_bus_recovery()
752 mpc_i2c_fixup(i2c); in fsl_i2c_bus_recovery()
775 struct mpc_i2c *i2c; in fsl_i2c_probe() local
783 i2c = devm_kzalloc(&op->dev, sizeof(*i2c), GFP_KERNEL); in fsl_i2c_probe()
784 if (!i2c) in fsl_i2c_probe()
787 i2c->dev = &op->dev; /* for debug and error output */ in fsl_i2c_probe()
789 init_waitqueue_head(&i2c->waitq); in fsl_i2c_probe()
790 spin_lock_init(&i2c->lock); in fsl_i2c_probe()
792 i2c->base = devm_platform_ioremap_resource(op, 0); in fsl_i2c_probe()
793 if (IS_ERR(i2c->base)) in fsl_i2c_probe()
794 return PTR_ERR(i2c->base); in fsl_i2c_probe()
796 i2c->irq = platform_get_irq(op, 0); in fsl_i2c_probe()
797 if (i2c->irq < 0) in fsl_i2c_probe()
798 return i2c->irq; in fsl_i2c_probe()
800 result = devm_request_irq(&op->dev, i2c->irq, mpc_i2c_isr, in fsl_i2c_probe()
801 IRQF_SHARED, "i2c-mpc", i2c); in fsl_i2c_probe()
803 dev_err(i2c->dev, "failed to attach interrupt\n"); in fsl_i2c_probe()
821 i2c->clk_per = clk; in fsl_i2c_probe()
834 data->setup(op->dev.of_node, i2c, clock); in fsl_i2c_probe()
838 mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock); in fsl_i2c_probe()
847 dev_info(i2c->dev, "timeout %u us\n", mpc_ops.timeout * 1000000 / HZ); in fsl_i2c_probe()
850 i2c->has_errata_A004447 = true; in fsl_i2c_probe()
852 i2c->adap = mpc_ops; in fsl_i2c_probe()
853 scnprintf(i2c->adap.name, sizeof(i2c->adap.name), in fsl_i2c_probe()
855 i2c->adap.dev.parent = &op->dev; in fsl_i2c_probe()
856 i2c->adap.nr = op->id; in fsl_i2c_probe()
857 i2c->adap.dev.of_node = of_node_get(op->dev.of_node); in fsl_i2c_probe()
858 i2c->adap.bus_recovery_info = &fsl_i2c_recovery_info; in fsl_i2c_probe()
859 platform_set_drvdata(op, i2c); in fsl_i2c_probe()
860 i2c_set_adapdata(&i2c->adap, i2c); in fsl_i2c_probe()
862 result = i2c_add_numbered_adapter(&i2c->adap); in fsl_i2c_probe()
869 clk_disable_unprepare(i2c->clk_per); in fsl_i2c_probe()
876 struct mpc_i2c *i2c = platform_get_drvdata(op); in fsl_i2c_remove() local
878 i2c_del_adapter(&i2c->adap); in fsl_i2c_remove()
880 clk_disable_unprepare(i2c->clk_per); in fsl_i2c_remove()
887 struct mpc_i2c *i2c = dev_get_drvdata(dev); in mpc_i2c_suspend() local
889 i2c->fdr = readb(i2c->base + MPC_I2C_FDR); in mpc_i2c_suspend()
890 i2c->dfsrr = readb(i2c->base + MPC_I2C_DFSRR); in mpc_i2c_suspend()
897 struct mpc_i2c *i2c = dev_get_drvdata(dev); in mpc_i2c_resume() local
899 writeb(i2c->fdr, i2c->base + MPC_I2C_FDR); in mpc_i2c_resume()
900 writeb(i2c->dfsrr, i2c->base + MPC_I2C_DFSRR); in mpc_i2c_resume()