1 // SPDX-License-Identifier: GPL-2.0
7  * Copyright (C) 2003-2004 Humboldt Solutions Ltd, adrian@humboldt.co.uk
32 #define DRV_NAME "mpc-i2c"
116 	writeb(x, i2c->base + MPC_I2C_CR);  in writeccr()
127 	u32 delay_val = 1000000 / i2c->real_clk + 1;  in mpc_i2c_fixup()
132 	for (k = 9; k; k--) {  in mpc_i2c_fixup()
135 		readb(i2c->base + MPC_I2C_DR);  in mpc_i2c_fixup()
143 	void __iomem *addr = i2c->base + MPC_I2C_SR;  in i2c_mpc_wait_sr()
153  * 2.  I2CCR - a0h
157  * 5.  I2CCR - 00h
158  * 6.  I2CCR - 22h
159  * 7.  I2CCR - a2h
163  * 11. I2CCR - 82h
167  * 15. I2CCR - 80h
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()
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()
195 			dev_err(i2c->dev, "timeout waiting for CSR_MIF\n");  in mpc_i2c_fixup_A004447()
200 		val = readb(i2c->base + MPC_I2C_DR);  in mpc_i2c_fixup_A004447()
203 			dev_err(i2c->dev, "timeout waiting for CSR_MIF\n");  in mpc_i2c_fixup_A004447()
241 		/* see below - default fdr = 0x3f -> div = 2048 */  in mpc_i2c_get_fdr_52xx()
243 		return -EINVAL;  in mpc_i2c_get_fdr_52xx()
256 		if (div->fdr & 0xc0 && pvr == 0x80822011)  in mpc_i2c_get_fdr_52xx()
258 		if (div->divider >= divider)  in mpc_i2c_get_fdr_52xx()
262 	*real_clk = mpc5xxx_get_bus_frequency(node) / div->divider;  in mpc_i2c_get_fdr_52xx()
263 	return (int)div->fdr;  in mpc_i2c_get_fdr_52xx()
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()
307 					    "fsl,mpc5121-i2c-ctrl");  in mpc_i2c_setup_512x()
311 			/* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */  in mpc_i2c_setup_512x()
358 	node = of_find_node_by_name(NULL, "global-utilities");  in mpc_i2c_get_sec_cfg_8xxx()
375 				val = in_be32(reg) & 0x00000020; /* sec-cfg */  in mpc_i2c_get_sec_cfg_8xxx()
388 	 * may have prescaler 1, 2, or 3, depending on the power-on  in mpc_i2c_get_prescaler_8xxx()
428 		/* see below - default fdr = 0x1031 -> div = 16 * 3072 */  in mpc_i2c_get_fdr_8xxx()
430 		return -EINVAL;  in mpc_i2c_get_fdr_8xxx()
444 		if (div->divider >= divider)  in mpc_i2c_get_fdr_8xxx()
448 	*real_clk = fsl_get_sys_freq() / prescaler / div->divider;  in mpc_i2c_get_fdr_8xxx()
449 	return (int)div->fdr;  in mpc_i2c_get_fdr_8xxx()
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()
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()
495 	struct i2c_msg *msg = &i2c->msgs[i2c->curr_msg];  in mpc_i2c_do_action()
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 (msg->flags & I2C_M_RD)  in mpc_i2c_do_action()
506 	if (msg->flags & I2C_M_RECV_LEN)  in mpc_i2c_do_action()
509 	switch (i2c->action) {  in mpc_i2c_do_action()
511 		i2c->cntl_bits |= CCR_RSTA;  in mpc_i2c_do_action()
515 		i2c->cntl_bits |= CCR_MSTA | CCR_MTX;  in mpc_i2c_do_action()
516 		writeccr(i2c, i2c->cntl_bits);  in mpc_i2c_do_action()
517 		writeb((msg->addr << 1) | dir, i2c->base + MPC_I2C_DR);  in mpc_i2c_do_action()
518 		i2c->expect_rxack = 1;  in mpc_i2c_do_action()
519 		i2c->action = dir ? MPC_I2C_ACTION_READ_BEGIN : MPC_I2C_ACTION_WRITE;  in mpc_i2c_do_action()
523 		if (msg->len) {  in mpc_i2c_do_action()
524 			if (msg->len == 1 && !(msg->flags & I2C_M_RECV_LEN))  in mpc_i2c_do_action()
525 				i2c->cntl_bits |= CCR_TXAK;  in mpc_i2c_do_action()
527 			writeccr(i2c, i2c->cntl_bits);  in mpc_i2c_do_action()
529 			readb(i2c->base + MPC_I2C_DR);  in mpc_i2c_do_action()
531 		i2c->action = MPC_I2C_ACTION_READ_BYTE;  in mpc_i2c_do_action()
535 		if (i2c->byte_posn || !recv_len) {  in mpc_i2c_do_action()
537 			if (i2c->byte_posn == msg->len - 2)  in mpc_i2c_do_action()
538 				i2c->cntl_bits |= CCR_TXAK;  in mpc_i2c_do_action()
540 			if (i2c->byte_posn == msg->len - 1)  in mpc_i2c_do_action()
541 				i2c->cntl_bits |= CCR_MTX;  in mpc_i2c_do_action()
543 			writeccr(i2c, i2c->cntl_bits);  in mpc_i2c_do_action()
546 		byte = readb(i2c->base + MPC_I2C_DR);  in mpc_i2c_do_action()
548 		if (i2c->byte_posn == 0 && recv_len) {  in mpc_i2c_do_action()
550 				mpc_i2c_finish(i2c, -EPROTO);  in mpc_i2c_do_action()
553 			msg->len += byte;  in mpc_i2c_do_action()
558 			if (msg->len == 2) {  in mpc_i2c_do_action()
559 				i2c->cntl_bits |= CCR_TXAK;  in mpc_i2c_do_action()
560 				writeccr(i2c, i2c->cntl_bits);  in mpc_i2c_do_action()
564 		dev_dbg(i2c->dev, "%s %02x\n", action_str[i2c->action], byte);  in mpc_i2c_do_action()
565 		msg->buf[i2c->byte_posn++] = byte;  in mpc_i2c_do_action()
569 		dev_dbg(i2c->dev, "%s %02x\n", action_str[i2c->action],  in mpc_i2c_do_action()
570 			msg->buf[i2c->byte_posn]);  in mpc_i2c_do_action()
571 		writeb(msg->buf[i2c->byte_posn++], i2c->base + MPC_I2C_DR);  in mpc_i2c_do_action()
572 		i2c->expect_rxack = 1;  in mpc_i2c_do_action()
580 		WARN(1, "Unexpected action %d\n", i2c->action);  in mpc_i2c_do_action()
584 	if (msg->len == i2c->byte_posn) {  in mpc_i2c_do_action()
585 		i2c->curr_msg++;  in mpc_i2c_do_action()
586 		i2c->byte_posn = 0;  in mpc_i2c_do_action()
588 		if (i2c->curr_msg == i2c->num_msgs) {  in mpc_i2c_do_action()
589 			i2c->action = MPC_I2C_ACTION_STOP;  in mpc_i2c_do_action()
597 			i2c->action = MPC_I2C_ACTION_RESTART;  in mpc_i2c_do_action()
604 	spin_lock(&i2c->lock);  in mpc_i2c_do_intr()
607 		dev_dbg(i2c->dev, "unfinished\n");  in mpc_i2c_do_intr()
608 		mpc_i2c_finish(i2c, -EIO);  in mpc_i2c_do_intr()
613 		dev_dbg(i2c->dev, "arbitration lost\n");  in mpc_i2c_do_intr()
614 		mpc_i2c_finish(i2c, -EAGAIN);  in mpc_i2c_do_intr()
618 	if (i2c->expect_rxack && (status & CSR_RXAK)) {  in mpc_i2c_do_intr()
619 		dev_dbg(i2c->dev, "no Rx ACK\n");  in mpc_i2c_do_intr()
620 		mpc_i2c_finish(i2c, -ENXIO);  in mpc_i2c_do_intr()
623 	i2c->expect_rxack = 0;  in mpc_i2c_do_intr()
628 	spin_unlock(&i2c->lock);  in mpc_i2c_do_intr()
636 	status = readb(i2c->base + MPC_I2C_SR);  in mpc_i2c_isr()
639 		readb_poll_timeout(i2c->base + MPC_I2C_SR, status, !(status & CSR_MCF), 0, 100);  in mpc_i2c_isr()
640 		writeb(0, i2c->base + MPC_I2C_SR);  in mpc_i2c_isr()
651 	time_left = wait_event_timeout(i2c->waitq, !i2c->block, i2c->adap.timeout);  in mpc_i2c_wait_for_completion()
653 		return -ETIMEDOUT;  in mpc_i2c_wait_for_completion()
666 	spin_lock_irqsave(&i2c->lock, flags);  in mpc_i2c_execute_msg()
668 	i2c->curr_msg = 0;  in mpc_i2c_execute_msg()
669 	i2c->rc = 0;  in mpc_i2c_execute_msg()
670 	i2c->byte_posn = 0;  in mpc_i2c_execute_msg()
671 	i2c->block = 1;  in mpc_i2c_execute_msg()
672 	i2c->action = MPC_I2C_ACTION_START;  in mpc_i2c_execute_msg()
674 	i2c->cntl_bits = CCR_MEN | CCR_MIEN;  in mpc_i2c_execute_msg()
675 	writeb(0, i2c->base + MPC_I2C_SR);  in mpc_i2c_execute_msg()
676 	writeccr(i2c, i2c->cntl_bits);  in mpc_i2c_execute_msg()
680 	spin_unlock_irqrestore(&i2c->lock, flags);  in mpc_i2c_execute_msg()
684 		i2c->rc = ret;  in mpc_i2c_execute_msg()
686 	if (i2c->rc == -EIO || i2c->rc == -EAGAIN || i2c->rc == -ETIMEDOUT)  in mpc_i2c_execute_msg()
687 		i2c_recover_bus(&i2c->adap);  in mpc_i2c_execute_msg()
691 	while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {  in mpc_i2c_execute_msg()
693 			u8 status = readb(i2c->base + MPC_I2C_SR);  in mpc_i2c_execute_msg()
695 			dev_dbg(i2c->dev, "timeout\n");  in mpc_i2c_execute_msg()
698 				       i2c->base + MPC_I2C_SR);  in mpc_i2c_execute_msg()
699 				i2c_recover_bus(&i2c->adap);  in mpc_i2c_execute_msg()
701 			return -EIO;  in mpc_i2c_execute_msg()
706 	return i2c->rc;  in mpc_i2c_execute_msg()
715 	dev_dbg(i2c->dev, "num = %d\n", num);  in mpc_xfer()
717 		dev_dbg(i2c->dev, "  addr = %02x, flags = %02x, len = %d, %*ph\n",  in mpc_xfer()
722 	WARN_ON(i2c->msgs != NULL);  in mpc_xfer()
723 	i2c->msgs = msgs;  in mpc_xfer()
724 	i2c->num_msgs = num;  in mpc_xfer()
730 	i2c->num_msgs = 0;  in mpc_xfer()
731 	i2c->msgs = NULL;  in mpc_xfer()
746 	if (i2c->has_errata_A004447)  in fsl_i2c_bus_recovery()
780 	i2c = devm_kzalloc(&op->dev, sizeof(*i2c), GFP_KERNEL);  in fsl_i2c_probe()
782 		return -ENOMEM;  in fsl_i2c_probe()
784 	i2c->dev = &op->dev; /* for debug and error output */  in fsl_i2c_probe()
786 	init_waitqueue_head(&i2c->waitq);  in fsl_i2c_probe()
787 	spin_lock_init(&i2c->lock);  in fsl_i2c_probe()
789 	i2c->base = devm_platform_ioremap_resource(op, 0);  in fsl_i2c_probe()
790 	if (IS_ERR(i2c->base))  in fsl_i2c_probe()
791 		return PTR_ERR(i2c->base);  in fsl_i2c_probe()
793 	i2c->irq = platform_get_irq(op, 0);  in fsl_i2c_probe()
794 	if (i2c->irq < 0)  in fsl_i2c_probe()
795 		return i2c->irq;  in fsl_i2c_probe()
797 	result = devm_request_irq(&op->dev, i2c->irq, mpc_i2c_isr,  in fsl_i2c_probe()
798 			IRQF_SHARED, "i2c-mpc", i2c);  in fsl_i2c_probe()
800 		dev_err(i2c->dev, "failed to attach interrupt\n");  in fsl_i2c_probe()
808 	clk = devm_clk_get_optional(&op->dev, NULL);  in fsl_i2c_probe()
814 		dev_err(&op->dev, "failed to enable clock\n");  in fsl_i2c_probe()
818 	i2c->clk_per = clk;  in fsl_i2c_probe()
820 	if (of_property_read_bool(op->dev.of_node, "fsl,preserve-clocking")) {  in fsl_i2c_probe()
823 		prop = of_get_property(op->dev.of_node, "clock-frequency",  in fsl_i2c_probe()
829 	data = device_get_match_data(&op->dev);  in fsl_i2c_probe()
831 		data->setup(op->dev.of_node, i2c, clock);  in fsl_i2c_probe()
834 		if (of_get_property(op->dev.of_node, "dfsrr", NULL))  in fsl_i2c_probe()
835 			mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock);  in fsl_i2c_probe()
838 	prop = of_get_property(op->dev.of_node, "fsl,timeout", &plen);  in fsl_i2c_probe()
844 	dev_info(i2c->dev, "timeout %u us\n", mpc_ops.timeout * 1000000 / HZ);  in fsl_i2c_probe()
846 	if (of_property_read_bool(op->dev.of_node, "fsl,i2c-erratum-a004447"))  in fsl_i2c_probe()
847 		i2c->has_errata_A004447 = true;  in fsl_i2c_probe()
849 	i2c->adap = mpc_ops;  in fsl_i2c_probe()
850 	scnprintf(i2c->adap.name, sizeof(i2c->adap.name),  in fsl_i2c_probe()
851 		  "MPC adapter (%s)", of_node_full_name(op->dev.of_node));  in fsl_i2c_probe()
852 	i2c->adap.dev.parent = &op->dev;  in fsl_i2c_probe()
853 	i2c->adap.nr = op->id;  in fsl_i2c_probe()
854 	i2c->adap.dev.of_node = of_node_get(op->dev.of_node);  in fsl_i2c_probe()
855 	i2c->adap.bus_recovery_info = &fsl_i2c_recovery_info;  in fsl_i2c_probe()
857 	i2c_set_adapdata(&i2c->adap, i2c);  in fsl_i2c_probe()
859 	result = i2c_add_numbered_adapter(&i2c->adap);  in fsl_i2c_probe()
866 	clk_disable_unprepare(i2c->clk_per);  in fsl_i2c_probe()
875 	i2c_del_adapter(&i2c->adap);  in fsl_i2c_remove()
877 	clk_disable_unprepare(i2c->clk_per);  in fsl_i2c_remove()
886 	i2c->fdr = readb(i2c->base + MPC_I2C_FDR);  in mpc_i2c_suspend()
887 	i2c->dfsrr = readb(i2c->base + MPC_I2C_DFSRR);  in mpc_i2c_suspend()
896 	writeb(i2c->fdr, i2c->base + MPC_I2C_FDR);  in mpc_i2c_resume()
897 	writeb(i2c->dfsrr, i2c->base + MPC_I2C_DFSRR);  in mpc_i2c_resume()
924 	{.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
925 	{.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
926 	{.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
927 	{.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, },
928 	{.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
929 	{.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
930 	{.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
932 	{.compatible = "fsl-i2c", },
951 MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "