1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * X-Gene SLIMpro I2C Driver
9  * This driver provides support for X-Gene SLIMpro I2C device access
10  * using the APM X-Gene SLIMpro mailbox driver.
14 #include <linux/dma-mapping.h>
62  * dev		- Controller number (0-based)
63  * chip		- I2C chip address
64  * op		- SLIMPRO_IIC_READ or SLIMPRO_IIC_WRITE
65  * proto	- SLIMPRO_IIC_SMB_PROTOCOL or SLIMPRO_IIC_I2C_PROTOCOL
66  * addrlen	- Length of the address field
67  * datalen	- Length of the data field
139 	if (ctx->resp_msg)  in slimpro_i2c_rx_cb()
140 		*ctx->resp_msg = ((u32 *)mssg)[1];  in slimpro_i2c_rx_cb()
142 	if (ctx->mbox_client.tx_block)  in slimpro_i2c_rx_cb()
143 		complete(&ctx->rd_complete);  in slimpro_i2c_rx_cb()
150 							ctx->pcc_chan->shmem;  in slimpro_i2c_pcc_rx_cb()
153 	if (!xgene_word_tst_and_clr(&generic_comm_base->status,  in slimpro_i2c_pcc_rx_cb()
157 	if (xgene_word_tst_and_clr(&generic_comm_base->status,  in slimpro_i2c_pcc_rx_cb()
162 		if (ctx->resp_msg)  in slimpro_i2c_pcc_rx_cb()
163 			*ctx->resp_msg = ((u32 *)msg)[1];  in slimpro_i2c_pcc_rx_cb()
165 		complete(&ctx->rd_complete);  in slimpro_i2c_pcc_rx_cb()
172 							ctx->pcc_chan->shmem;  in slimpro_i2c_pcc_tx_prepare()
177 	WRITE_ONCE(generic_comm_base->signature,  in slimpro_i2c_pcc_tx_prepare()
178 		   cpu_to_le32(PCC_SIGNATURE | ctx->mbox_idx));  in slimpro_i2c_pcc_tx_prepare()
180 	WRITE_ONCE(generic_comm_base->command,  in slimpro_i2c_pcc_tx_prepare()
183 	status = le16_to_cpu(READ_ONCE(generic_comm_base->status));  in slimpro_i2c_pcc_tx_prepare()
185 	WRITE_ONCE(generic_comm_base->status, cpu_to_le16(status));  in slimpro_i2c_pcc_tx_prepare()
194 	if (ctx->mbox_client.tx_block || !acpi_disabled) {  in start_i2c_msg_xfer()
195 		if (!wait_for_completion_timeout(&ctx->rd_complete,  in start_i2c_msg_xfer()
197 			return -ETIMEDOUT;  in start_i2c_msg_xfer()
201 	if (*ctx->resp_msg == 0xffffffff)  in start_i2c_msg_xfer()
202 		return -ENODEV;  in start_i2c_msg_xfer()
213 	ctx->resp_msg = data;  in slimpro_i2c_send_msg()
216 		reinit_completion(&ctx->rd_complete);  in slimpro_i2c_send_msg()
220 	rc = mbox_send_message(ctx->mbox_chan, msg);  in slimpro_i2c_send_msg()
228 		mbox_chan_txdone(ctx->mbox_chan, 0);  in slimpro_i2c_send_msg()
230 	ctx->resp_msg = NULL;  in slimpro_i2c_send_msg()
271 	paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen, DMA_FROM_DEVICE);  in slimpro_i2c_blkrd()
272 	if (dma_mapping_error(ctx->dev, paddr)) {  in slimpro_i2c_blkrd()
273 		dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",  in slimpro_i2c_blkrd()
274 			ctx->dma_buffer);  in slimpro_i2c_blkrd()
275 		return -ENOMEM;  in slimpro_i2c_blkrd()
289 	memcpy(data, ctx->dma_buffer, readlen);  in slimpro_i2c_blkrd()
291 	dma_unmap_single(ctx->dev, paddr, readlen, DMA_FROM_DEVICE);  in slimpro_i2c_blkrd()
304 		return -EINVAL;  in slimpro_i2c_blkwr()
306 	memcpy(ctx->dma_buffer, data, writelen);  in slimpro_i2c_blkwr()
307 	paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,  in slimpro_i2c_blkwr()
309 	if (dma_mapping_error(ctx->dev, paddr)) {  in slimpro_i2c_blkwr()
310 		dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",  in slimpro_i2c_blkwr()
311 			ctx->dma_buffer);  in slimpro_i2c_blkwr()
312 		return -ENOMEM;  in slimpro_i2c_blkwr()
322 	if (ctx->mbox_client.tx_block)  in slimpro_i2c_blkwr()
323 		reinit_completion(&ctx->rd_complete);  in slimpro_i2c_blkwr()
327 	dma_unmap_single(ctx->dev, paddr, writelen, DMA_TO_DEVICE);  in slimpro_i2c_blkwr()
337 	int ret = -EOPNOTSUPP;  in xgene_slimpro_i2c_xfer()
346 			data->byte = val;  in xgene_slimpro_i2c_xfer()
358 			data->byte = val;  in xgene_slimpro_i2c_xfer()
360 			val = data->byte;  in xgene_slimpro_i2c_xfer()
371 			data->word = val;  in xgene_slimpro_i2c_xfer()
373 			val = data->word;  in xgene_slimpro_i2c_xfer()
386 						&data->block[0]);  in xgene_slimpro_i2c_xfer()
392 						data->block[0] + 1,  in xgene_slimpro_i2c_xfer()
393 						&data->block[0]);  in xgene_slimpro_i2c_xfer()
404 						&data->block[1]);  in xgene_slimpro_i2c_xfer()
409 						data->block[0],  in xgene_slimpro_i2c_xfer()
410 						&data->block[1]);  in xgene_slimpro_i2c_xfer()
443 	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);  in xgene_slimpro_i2c_probe()
445 		return -ENOMEM;  in xgene_slimpro_i2c_probe()
447 	ctx->dev = &pdev->dev;  in xgene_slimpro_i2c_probe()
449 	cl = &ctx->mbox_client;  in xgene_slimpro_i2c_probe()
452 	cl->dev = &pdev->dev;  in xgene_slimpro_i2c_probe()
453 	init_completion(&ctx->rd_complete);  in xgene_slimpro_i2c_probe()
454 	cl->tx_tout = MAILBOX_OP_TIMEOUT;  in xgene_slimpro_i2c_probe()
455 	cl->knows_txdone = false;  in xgene_slimpro_i2c_probe()
457 		cl->tx_block = true;  in xgene_slimpro_i2c_probe()
458 		cl->rx_callback = slimpro_i2c_rx_cb;  in xgene_slimpro_i2c_probe()
459 		ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);  in xgene_slimpro_i2c_probe()
460 		if (IS_ERR(ctx->mbox_chan))  in xgene_slimpro_i2c_probe()
461 			return dev_err_probe(&pdev->dev, PTR_ERR(ctx->mbox_chan),  in xgene_slimpro_i2c_probe()
467 		acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,  in xgene_slimpro_i2c_probe()
468 					    &pdev->dev);  in xgene_slimpro_i2c_probe()
470 			return -EINVAL;  in xgene_slimpro_i2c_probe()
472 		if (device_property_read_u32(&pdev->dev, "pcc-channel",  in xgene_slimpro_i2c_probe()
473 					     &ctx->mbox_idx))  in xgene_slimpro_i2c_probe()
474 			ctx->mbox_idx = MAILBOX_I2C_INDEX;  in xgene_slimpro_i2c_probe()
476 		cl->tx_block = false;  in xgene_slimpro_i2c_probe()
477 		cl->rx_callback = slimpro_i2c_pcc_rx_cb;  in xgene_slimpro_i2c_probe()
478 		pcc_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);  in xgene_slimpro_i2c_probe()
480 			return dev_err_probe(&pdev->dev, PTR_ERR(pcc_chan),  in xgene_slimpro_i2c_probe()
483 		ctx->pcc_chan = pcc_chan;  in xgene_slimpro_i2c_probe()
484 		ctx->mbox_chan = pcc_chan->mchan;  in xgene_slimpro_i2c_probe()
486 		if (!ctx->mbox_chan->mbox->txdone_irq) {  in xgene_slimpro_i2c_probe()
487 			rc = dev_err_probe(&pdev->dev, -ENOENT,  in xgene_slimpro_i2c_probe()
493 	rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));  in xgene_slimpro_i2c_probe()
495 		dev_warn(&pdev->dev, "Unable to set dma mask\n");  in xgene_slimpro_i2c_probe()
498 	adapter = &ctx->adapter;  in xgene_slimpro_i2c_probe()
499 	snprintf(adapter->name, sizeof(adapter->name), "MAILBOX I2C");  in xgene_slimpro_i2c_probe()
500 	adapter->algo = &xgene_slimpro_i2c_algorithm;  in xgene_slimpro_i2c_probe()
501 	adapter->class = I2C_CLASS_HWMON;  in xgene_slimpro_i2c_probe()
502 	adapter->dev.parent = &pdev->dev;  in xgene_slimpro_i2c_probe()
503 	adapter->dev.of_node = pdev->dev.of_node;  in xgene_slimpro_i2c_probe()
504 	ACPI_COMPANION_SET(&adapter->dev, ACPI_COMPANION(&pdev->dev));  in xgene_slimpro_i2c_probe()
510 	dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");  in xgene_slimpro_i2c_probe()
515 		mbox_free_channel(ctx->mbox_chan);  in xgene_slimpro_i2c_probe()
517 		pcc_mbox_free_channel(ctx->pcc_chan);  in xgene_slimpro_i2c_probe()
526 	i2c_del_adapter(&ctx->adapter);  in xgene_slimpro_i2c_remove()
529 		mbox_free_channel(ctx->mbox_chan);  in xgene_slimpro_i2c_remove()
531 		pcc_mbox_free_channel(ctx->pcc_chan);  in xgene_slimpro_i2c_remove()
535 	{.compatible = "apm,xgene-slimpro-i2c" },
553 		.name	= "xgene-slimpro-i2c",
561 MODULE_DESCRIPTION("APM X-Gene SLIMpro I2C driver");