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
130 writeccr(i2c, 0); in mpc_i2c_fixup()
131 writeb(0, i2c->base + MPC_I2C_SR); /* clear any status bits */ in mpc_i2c_fixup()
132 writeccr(i2c, CCR_MEN | CCR_MSTA); /* START */ in mpc_i2c_fixup()
133 readb(i2c->base + MPC_I2C_DR); /* init xfer */ in mpc_i2c_fixup()
136 writeccr(i2c, CCR_MEN | CCR_MSTA | CCR_RSTA); /* delay SDA */ in mpc_i2c_fixup()
137 readb(i2c->base + MPC_I2C_DR); in mpc_i2c_fixup()
142 writeccr(i2c, CCR_MEN); /* Initiate STOP */ in mpc_i2c_fixup()
143 readb(i2c->base + MPC_I2C_DR); in mpc_i2c_fixup()
145 writeccr(i2c, 0); in mpc_i2c_fixup()
148 static int i2c_mpc_wait_sr(struct mpc_i2c *i2c, int mask) in i2c_mpc_wait_sr() argument
150 void __iomem *addr = i2c->base + MPC_I2C_SR; in i2c_mpc_wait_sr()
176 static void mpc_i2c_fixup_A004447(struct mpc_i2c *i2c) in mpc_i2c_fixup_A004447() argument
181 writeccr(i2c, CCR_MEN | CCR_MSTA); in mpc_i2c_fixup_A004447()
182 ret = i2c_mpc_wait_sr(i2c, CSR_MBB); in mpc_i2c_fixup_A004447()
184 dev_err(i2c->dev, "timeout waiting for CSR_MBB\n"); in mpc_i2c_fixup_A004447()
188 val = readb(i2c->base + MPC_I2C_SR); in mpc_i2c_fixup_A004447()
191 writeccr(i2c, 0x00); in mpc_i2c_fixup_A004447()
192 writeccr(i2c, CCR_MSTA | CCR_RSVD); in mpc_i2c_fixup_A004447()
193 writeccr(i2c, CCR_MEN | CCR_MSTA | CCR_RSVD); in mpc_i2c_fixup_A004447()
194 ret = i2c_mpc_wait_sr(i2c, CSR_MBB); in mpc_i2c_fixup_A004447()
196 dev_err(i2c->dev, "timeout waiting for CSR_MBB\n"); in mpc_i2c_fixup_A004447()
199 val = readb(i2c->base + MPC_I2C_DR); in mpc_i2c_fixup_A004447()
200 ret = i2c_mpc_wait_sr(i2c, CSR_MIF); in mpc_i2c_fixup_A004447()
202 dev_err(i2c->dev, "timeout waiting for CSR_MIF\n"); in mpc_i2c_fixup_A004447()
205 writeccr(i2c, CCR_MEN | CCR_RSVD); in mpc_i2c_fixup_A004447()
207 val = readb(i2c->base + MPC_I2C_DR); in mpc_i2c_fixup_A004447()
208 ret = i2c_mpc_wait_sr(i2c, CSR_MIF); in mpc_i2c_fixup_A004447()
210 dev_err(i2c->dev, "timeout waiting for CSR_MIF\n"); in mpc_i2c_fixup_A004447()
213 writeccr(i2c, CCR_MEN); in mpc_i2c_fixup_A004447()
274 struct mpc_i2c *i2c, in mpc_i2c_setup_52xx() argument
280 dev_dbg(i2c->dev, "using fdr %d\n", in mpc_i2c_setup_52xx()
281 readb(i2c->base + MPC_I2C_FDR)); in mpc_i2c_setup_52xx()
285 ret = mpc_i2c_get_fdr_52xx(node, clock, &i2c->real_clk); in mpc_i2c_setup_52xx()
288 writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR); in mpc_i2c_setup_52xx()
291 dev_info(i2c->dev, "clock %u Hz (fdr=%d)\n", i2c->real_clk, in mpc_i2c_setup_52xx()
296 struct mpc_i2c *i2c, in mpc_i2c_setup_52xx() argument
304 struct mpc_i2c *i2c, in mpc_i2c_setup_512x() argument
328 mpc_i2c_setup_52xx(node, i2c, clock); in mpc_i2c_setup_512x()
332 struct mpc_i2c *i2c, in mpc_i2c_setup_512x() argument
460 struct mpc_i2c *i2c, in mpc_i2c_setup_8xxx() argument
466 dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n", in mpc_i2c_setup_8xxx()
467 readb(i2c->base + MPC_I2C_DFSRR), in mpc_i2c_setup_8xxx()
468 readb(i2c->base + MPC_I2C_FDR)); in mpc_i2c_setup_8xxx()
472 ret = mpc_i2c_get_fdr_8xxx(node, clock, &i2c->real_clk); in mpc_i2c_setup_8xxx()
475 writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR); in mpc_i2c_setup_8xxx()
476 writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR); in mpc_i2c_setup_8xxx()
479 dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n", in mpc_i2c_setup_8xxx()
480 i2c->real_clk, fdr >> 8, fdr & 0xff); in mpc_i2c_setup_8xxx()
485 struct mpc_i2c *i2c, in mpc_i2c_setup_8xxx() argument
491 static void mpc_i2c_finish(struct mpc_i2c *i2c, int rc) in mpc_i2c_finish() argument
493 i2c->rc = rc; in mpc_i2c_finish()
494 i2c->block = 0; in mpc_i2c_finish()
495 i2c->cntl_bits = CCR_MEN; in mpc_i2c_finish()
496 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_finish()
497 wake_up(&i2c->waitq); in mpc_i2c_finish()
500 static void mpc_i2c_do_action(struct mpc_i2c *i2c) in mpc_i2c_do_action() argument
507 dev_dbg(i2c->dev, "action = %s\n", action_str[i2c->action]); in mpc_i2c_do_action()
509 i2c->cntl_bits &= ~(CCR_RSTA | CCR_MTX | CCR_TXAK); in mpc_i2c_do_action()
511 if (i2c->action != MPC_I2C_ACTION_STOP) { in mpc_i2c_do_action()
512 msg = &i2c->msgs[i2c->curr_msg]; in mpc_i2c_do_action()
519 switch (i2c->action) { in mpc_i2c_do_action()
521 i2c->cntl_bits |= CCR_RSTA; in mpc_i2c_do_action()
525 i2c->cntl_bits |= CCR_MSTA | CCR_MTX; in mpc_i2c_do_action()
526 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_do_action()
527 writeb((msg->addr << 1) | dir, i2c->base + MPC_I2C_DR); in mpc_i2c_do_action()
528 i2c->expect_rxack = 1; in mpc_i2c_do_action()
529 i2c->action = dir ? MPC_I2C_ACTION_READ_BEGIN : MPC_I2C_ACTION_WRITE; in mpc_i2c_do_action()
535 i2c->cntl_bits |= CCR_TXAK; in mpc_i2c_do_action()
537 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_do_action()
539 readb(i2c->base + MPC_I2C_DR); in mpc_i2c_do_action()
541 i2c->action = MPC_I2C_ACTION_READ_BYTE; in mpc_i2c_do_action()
545 if (i2c->byte_posn || !recv_len) { in mpc_i2c_do_action()
547 if (i2c->byte_posn == msg->len - 2) in mpc_i2c_do_action()
548 i2c->cntl_bits |= CCR_TXAK; in mpc_i2c_do_action()
550 if (i2c->byte_posn == msg->len - 1) in mpc_i2c_do_action()
551 i2c->cntl_bits |= CCR_MTX; in mpc_i2c_do_action()
553 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_do_action()
556 byte = readb(i2c->base + MPC_I2C_DR); in mpc_i2c_do_action()
558 if (i2c->byte_posn == 0 && recv_len) { in mpc_i2c_do_action()
560 mpc_i2c_finish(i2c, -EPROTO); in mpc_i2c_do_action()
569 i2c->cntl_bits |= CCR_TXAK; in mpc_i2c_do_action()
570 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_do_action()
574 dev_dbg(i2c->dev, "%s %02x\n", action_str[i2c->action], byte); in mpc_i2c_do_action()
575 msg->buf[i2c->byte_posn++] = byte; in mpc_i2c_do_action()
579 dev_dbg(i2c->dev, "%s %02x\n", action_str[i2c->action], in mpc_i2c_do_action()
580 msg->buf[i2c->byte_posn]); in mpc_i2c_do_action()
581 writeb(msg->buf[i2c->byte_posn++], i2c->base + MPC_I2C_DR); in mpc_i2c_do_action()
582 i2c->expect_rxack = 1; in mpc_i2c_do_action()
586 mpc_i2c_finish(i2c, 0); in mpc_i2c_do_action()
590 WARN(1, "Unexpected action %d\n", i2c->action); in mpc_i2c_do_action()
594 if (msg && msg->len == i2c->byte_posn) { in mpc_i2c_do_action()
595 i2c->curr_msg++; in mpc_i2c_do_action()
596 i2c->byte_posn = 0; in mpc_i2c_do_action()
598 if (i2c->curr_msg == i2c->num_msgs) { in mpc_i2c_do_action()
599 i2c->action = MPC_I2C_ACTION_STOP; in mpc_i2c_do_action()
605 mpc_i2c_finish(i2c, 0); in mpc_i2c_do_action()
607 i2c->action = MPC_I2C_ACTION_RESTART; in mpc_i2c_do_action()
612 static void mpc_i2c_do_intr(struct mpc_i2c *i2c, u8 status) in mpc_i2c_do_intr() argument
614 spin_lock(&i2c->lock); in mpc_i2c_do_intr()
617 dev_dbg(i2c->dev, "unfinished\n"); in mpc_i2c_do_intr()
618 mpc_i2c_finish(i2c, -EIO); in mpc_i2c_do_intr()
623 dev_dbg(i2c->dev, "arbitration lost\n"); in mpc_i2c_do_intr()
624 mpc_i2c_finish(i2c, -EAGAIN); in mpc_i2c_do_intr()
628 if (i2c->expect_rxack && (status & CSR_RXAK)) { in mpc_i2c_do_intr()
629 dev_dbg(i2c->dev, "no Rx ACK\n"); in mpc_i2c_do_intr()
630 mpc_i2c_finish(i2c, -ENXIO); in mpc_i2c_do_intr()
633 i2c->expect_rxack = 0; in mpc_i2c_do_intr()
635 mpc_i2c_do_action(i2c); in mpc_i2c_do_intr()
638 spin_unlock(&i2c->lock); in mpc_i2c_do_intr()
643 struct mpc_i2c *i2c = dev_id; in mpc_i2c_isr() local
646 status = readb(i2c->base + MPC_I2C_SR); in mpc_i2c_isr()
649 readb_poll_timeout_atomic(i2c->base + MPC_I2C_SR, status, status & CSR_MCF, 0, 100); in mpc_i2c_isr()
650 writeb(0, i2c->base + MPC_I2C_SR); in mpc_i2c_isr()
651 mpc_i2c_do_intr(i2c, status); in mpc_i2c_isr()
657 static int mpc_i2c_wait_for_completion(struct mpc_i2c *i2c) in mpc_i2c_wait_for_completion() argument
661 time_left = wait_event_timeout(i2c->waitq, !i2c->block, i2c->adap.timeout); in mpc_i2c_wait_for_completion()
670 static int mpc_i2c_execute_msg(struct mpc_i2c *i2c) in mpc_i2c_execute_msg() argument
676 spin_lock_irqsave(&i2c->lock, flags); in mpc_i2c_execute_msg()
678 i2c->curr_msg = 0; in mpc_i2c_execute_msg()
679 i2c->rc = 0; in mpc_i2c_execute_msg()
680 i2c->byte_posn = 0; in mpc_i2c_execute_msg()
681 i2c->block = 1; in mpc_i2c_execute_msg()
682 i2c->action = MPC_I2C_ACTION_START; in mpc_i2c_execute_msg()
684 i2c->cntl_bits = CCR_MEN | CCR_MIEN; in mpc_i2c_execute_msg()
685 writeb(0, i2c->base + MPC_I2C_SR); in mpc_i2c_execute_msg()
686 writeccr(i2c, i2c->cntl_bits); in mpc_i2c_execute_msg()
688 mpc_i2c_do_action(i2c); in mpc_i2c_execute_msg()
690 spin_unlock_irqrestore(&i2c->lock, flags); in mpc_i2c_execute_msg()
692 ret = mpc_i2c_wait_for_completion(i2c); in mpc_i2c_execute_msg()
694 i2c->rc = ret; in mpc_i2c_execute_msg()
696 if (i2c->rc == -EIO || i2c->rc == -EAGAIN || i2c->rc == -ETIMEDOUT) in mpc_i2c_execute_msg()
697 i2c_recover_bus(&i2c->adap); in mpc_i2c_execute_msg()
701 while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) { in mpc_i2c_execute_msg()
703 u8 status = readb(i2c->base + MPC_I2C_SR); in mpc_i2c_execute_msg()
705 dev_dbg(i2c->dev, "timeout\n"); in mpc_i2c_execute_msg()
708 i2c->base + MPC_I2C_SR); in mpc_i2c_execute_msg()
709 i2c_recover_bus(&i2c->adap); in mpc_i2c_execute_msg()
716 return i2c->rc; in mpc_i2c_execute_msg()
722 struct mpc_i2c *i2c = i2c_get_adapdata(adap); in mpc_xfer() local
725 dev_dbg(i2c->dev, "num = %d\n", num); in mpc_xfer()
727 dev_dbg(i2c->dev, " addr = %02x, flags = %02x, len = %d, %*ph\n", in mpc_xfer()
732 WARN_ON(i2c->msgs != NULL); in mpc_xfer()
733 i2c->msgs = msgs; in mpc_xfer()
734 i2c->num_msgs = num; in mpc_xfer()
736 rc = mpc_i2c_execute_msg(i2c); in mpc_xfer()
740 i2c->num_msgs = 0; in mpc_xfer()
741 i2c->msgs = NULL; in mpc_xfer()
754 struct mpc_i2c *i2c = i2c_get_adapdata(adap); in fsl_i2c_bus_recovery() local
756 if (i2c->has_errata_A004447) in fsl_i2c_bus_recovery()
757 mpc_i2c_fixup_A004447(i2c); in fsl_i2c_bus_recovery()
759 mpc_i2c_fixup(i2c); in fsl_i2c_bus_recovery()
782 struct mpc_i2c *i2c; in fsl_i2c_probe() local
790 i2c = devm_kzalloc(&op->dev, sizeof(*i2c), GFP_KERNEL); in fsl_i2c_probe()
791 if (!i2c) in fsl_i2c_probe()
794 i2c->dev = &op->dev; /* for debug and error output */ in fsl_i2c_probe()
796 init_waitqueue_head(&i2c->waitq); in fsl_i2c_probe()
797 spin_lock_init(&i2c->lock); in fsl_i2c_probe()
799 i2c->base = devm_platform_ioremap_resource(op, 0); in fsl_i2c_probe()
800 if (IS_ERR(i2c->base)) in fsl_i2c_probe()
801 return PTR_ERR(i2c->base); in fsl_i2c_probe()
803 i2c->irq = platform_get_irq(op, 0); in fsl_i2c_probe()
804 if (i2c->irq < 0) in fsl_i2c_probe()
805 return i2c->irq; in fsl_i2c_probe()
807 result = devm_request_irq(&op->dev, i2c->irq, mpc_i2c_isr, in fsl_i2c_probe()
808 IRQF_SHARED, "i2c-mpc", i2c); in fsl_i2c_probe()
810 dev_err(i2c->dev, "failed to attach interrupt\n"); in fsl_i2c_probe()
828 i2c->clk_per = clk; in fsl_i2c_probe()
841 data->setup(op->dev.of_node, i2c, clock); in fsl_i2c_probe()
845 mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock); in fsl_i2c_probe()
854 dev_info(i2c->dev, "timeout %u us\n", mpc_ops.timeout * 1000000 / HZ); in fsl_i2c_probe()
857 i2c->has_errata_A004447 = true; in fsl_i2c_probe()
859 i2c->adap = mpc_ops; in fsl_i2c_probe()
860 scnprintf(i2c->adap.name, sizeof(i2c->adap.name), in fsl_i2c_probe()
862 i2c->adap.dev.parent = &op->dev; in fsl_i2c_probe()
863 i2c->adap.nr = op->id; in fsl_i2c_probe()
864 i2c->adap.dev.of_node = of_node_get(op->dev.of_node); in fsl_i2c_probe()
865 i2c->adap.bus_recovery_info = &fsl_i2c_recovery_info; in fsl_i2c_probe()
866 platform_set_drvdata(op, i2c); in fsl_i2c_probe()
867 i2c_set_adapdata(&i2c->adap, i2c); in fsl_i2c_probe()
869 result = i2c_add_numbered_adapter(&i2c->adap); in fsl_i2c_probe()
876 clk_disable_unprepare(i2c->clk_per); in fsl_i2c_probe()
883 struct mpc_i2c *i2c = platform_get_drvdata(op); in fsl_i2c_remove() local
885 i2c_del_adapter(&i2c->adap); in fsl_i2c_remove()
887 clk_disable_unprepare(i2c->clk_per); in fsl_i2c_remove()
894 struct mpc_i2c *i2c = dev_get_drvdata(dev); in mpc_i2c_suspend() local
896 i2c->fdr = readb(i2c->base + MPC_I2C_FDR); in mpc_i2c_suspend()
897 i2c->dfsrr = readb(i2c->base + MPC_I2C_DFSRR); in mpc_i2c_suspend()
904 struct mpc_i2c *i2c = dev_get_drvdata(dev); in mpc_i2c_resume() local
906 writeb(i2c->fdr, i2c->base + MPC_I2C_FDR); in mpc_i2c_resume()
907 writeb(i2c->dfsrr, i2c->base + MPC_I2C_DFSRR); in mpc_i2c_resume()