1 files changed, 617 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c b/drivers/i2c/busses/i2c-xgene-slimpro.c
new file mode 100644
index 000000000..76e9dcd63
--- /dev/null
+++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
@@ -0,0 +1,617 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * X-Gene SLIMpro I2C Driver
+ *
+ * Copyright (c) 2014, Applied Micro Circuits Corporation
+ * Author: Feng Kan <fkan@apm.com>
+ * Author: Hieu Le <hnle@apm.com>
+ *
+ * This driver provides support for X-Gene SLIMpro I2C device access
+ * using the APM X-Gene SLIMpro mailbox driver.
+ */
+#include <acpi/pcc.h>
+#include <linux/acpi.h>
+#include <linux/dma-mapping.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/version.h>
+
+#define MAILBOX_OP_TIMEOUT		1000	/* Operation time out in ms */
+#define MAILBOX_I2C_INDEX		0
+#define SLIMPRO_IIC_BUS			1	/* Use I2C bus 1 only */
+
+#define SMBUS_CMD_LEN			1
+#define BYTE_DATA			1
+#define WORD_DATA			2
+#define BLOCK_DATA			3
+
+#define SLIMPRO_IIC_I2C_PROTOCOL	0
+#define SLIMPRO_IIC_SMB_PROTOCOL	1
+
+#define SLIMPRO_IIC_READ		0
+#define SLIMPRO_IIC_WRITE		1
+
+#define IIC_SMB_WITHOUT_DATA_LEN	0
+#define IIC_SMB_WITH_DATA_LEN		1
+
+#define SLIMPRO_DEBUG_MSG		0
+#define SLIMPRO_MSG_TYPE_SHIFT		28
+#define SLIMPRO_DBG_SUBTYPE_I2C1READ	4
+#define SLIMPRO_DBGMSG_TYPE_SHIFT	24
+#define SLIMPRO_DBGMSG_TYPE_MASK	0x0F000000U
+#define SLIMPRO_IIC_DEV_SHIFT		23
+#define SLIMPRO_IIC_DEV_MASK		0x00800000U
+#define SLIMPRO_IIC_DEVID_SHIFT		13
+#define SLIMPRO_IIC_DEVID_MASK		0x007FE000U
+#define SLIMPRO_IIC_RW_SHIFT		12
+#define SLIMPRO_IIC_RW_MASK		0x00001000U
+#define SLIMPRO_IIC_PROTO_SHIFT		11
+#define SLIMPRO_IIC_PROTO_MASK		0x00000800U
+#define SLIMPRO_IIC_ADDRLEN_SHIFT	8
+#define SLIMPRO_IIC_ADDRLEN_MASK	0x00000700U
+#define SLIMPRO_IIC_DATALEN_SHIFT	0
+#define SLIMPRO_IIC_DATALEN_MASK	0x000000FFU
+
+/*
+ * SLIMpro I2C message encode
+ *
+ * dev		- Controller number (0-based)
+ * chip		- I2C chip address
+ * op		- SLIMPRO_IIC_READ or SLIMPRO_IIC_WRITE
+ * proto	- SLIMPRO_IIC_SMB_PROTOCOL or SLIMPRO_IIC_I2C_PROTOCOL
+ * addrlen	- Length of the address field
+ * datalen	- Length of the data field
+ */
+#define SLIMPRO_IIC_ENCODE_MSG(dev, chip, op, proto, addrlen, datalen) \
+	((SLIMPRO_DEBUG_MSG << SLIMPRO_MSG_TYPE_SHIFT) | \
+	((SLIMPRO_DBG_SUBTYPE_I2C1READ << SLIMPRO_DBGMSG_TYPE_SHIFT) & \
+	SLIMPRO_DBGMSG_TYPE_MASK) | \
+	((dev << SLIMPRO_IIC_DEV_SHIFT) & SLIMPRO_IIC_DEV_MASK) | \
+	((chip << SLIMPRO_IIC_DEVID_SHIFT) & SLIMPRO_IIC_DEVID_MASK) | \
+	((op << SLIMPRO_IIC_RW_SHIFT) & SLIMPRO_IIC_RW_MASK) | \
+	((proto << SLIMPRO_IIC_PROTO_SHIFT) & SLIMPRO_IIC_PROTO_MASK) | \
+	((addrlen << SLIMPRO_IIC_ADDRLEN_SHIFT) & SLIMPRO_IIC_ADDRLEN_MASK) | \
+	((datalen << SLIMPRO_IIC_DATALEN_SHIFT) & SLIMPRO_IIC_DATALEN_MASK))
+
+#define SLIMPRO_MSG_TYPE(v)             (((v) & 0xF0000000) >> 28)
+
+/*
+ * Encode for upper address for block data
+ */
+#define SLIMPRO_IIC_ENCODE_FLAG_BUFADDR			0x80000000
+#define SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(a)	((u32) (((a) << 30) \
+								& 0x40000000))
+#define SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(a)		((u32) (((a) >> 12) \
+								& 0x3FF00000))
+#define SLIMPRO_IIC_ENCODE_ADDR(a)			((a) & 0x000FFFFF)
+
+#define SLIMPRO_IIC_MSG_DWORD_COUNT			3
+
+/* PCC related defines */
+#define PCC_SIGNATURE			0x50424300
+#define PCC_STS_CMD_COMPLETE		BIT(0)
+#define PCC_STS_SCI_DOORBELL		BIT(1)
+#define PCC_STS_ERR			BIT(2)
+#define PCC_STS_PLAT_NOTIFY		BIT(3)
+#define PCC_CMD_GENERATE_DB_INT		BIT(15)
+
+struct slimpro_i2c_dev {
+	struct i2c_adapter adapter;
+	struct device *dev;
+	struct mbox_chan *mbox_chan;
+	struct mbox_client mbox_client;
+	int mbox_idx;
+	struct completion rd_complete;
+	u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* dma_buffer[0] is used for length */
+	u32 *resp_msg;
+	phys_addr_t comm_base_addr;
+	void *pcc_comm_addr;
+};
+
+#define to_slimpro_i2c_dev(cl)	\
+		container_of(cl, struct slimpro_i2c_dev, mbox_client)
+
+enum slimpro_i2c_version {
+	XGENE_SLIMPRO_I2C_V1 = 0,
+	XGENE_SLIMPRO_I2C_V2 = 1,
+};
+
+/*
+ * This function tests and clears a bitmask then returns its old value
+ */
+static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
+{
+	u16 ret, val;
+
+	val = le16_to_cpu(READ_ONCE(*addr));
+	ret = val & mask;
+	val &= ~mask;
+	WRITE_ONCE(*addr, cpu_to_le16(val));
+
+	return ret;
+}
+
+static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
+{
+	struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
+
+	/*
+	 * Response message format:
+	 * mssg[0] is the return code of the operation
+	 * mssg[1] is the first data word
+	 * mssg[2] is NOT used
+	 */
+	if (ctx->resp_msg)
+		*ctx->resp_msg = ((u32 *)mssg)[1];
+
+	if (ctx->mbox_client.tx_block)
+		complete(&ctx->rd_complete);
+}
+
+static void slimpro_i2c_pcc_rx_cb(struct mbox_client *cl, void *msg)
+{
+	struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
+	struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
+
+	/* Check if platform sends interrupt */
+	if (!xgene_word_tst_and_clr(&generic_comm_base->status,
+				    PCC_STS_SCI_DOORBELL))
+		return;
+
+	if (xgene_word_tst_and_clr(&generic_comm_base->status,
+				   PCC_STS_CMD_COMPLETE)) {
+		msg = generic_comm_base + 1;
+
+		/* Response message msg[1] contains the return value. */
+		if (ctx->resp_msg)
+			*ctx->resp_msg = ((u32 *)msg)[1];
+
+		complete(&ctx->rd_complete);
+	}
+}
+
+static void slimpro_i2c_pcc_tx_prepare(struct slimpro_i2c_dev *ctx, u32 *msg)
+{
+	struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
+	u32 *ptr = (void *)(generic_comm_base + 1);
+	u16 status;
+	int i;
+
+	WRITE_ONCE(generic_comm_base->signature,
+		   cpu_to_le32(PCC_SIGNATURE | ctx->mbox_idx));
+
+	WRITE_ONCE(generic_comm_base->command,
+		   cpu_to_le16(SLIMPRO_MSG_TYPE(msg[0]) | PCC_CMD_GENERATE_DB_INT));
+
+	status = le16_to_cpu(READ_ONCE(generic_comm_base->status));
+	status &= ~PCC_STS_CMD_COMPLETE;
+	WRITE_ONCE(generic_comm_base->status, cpu_to_le16(status));
+
+	/* Copy the message to the PCC comm space */
+	for (i = 0; i < SLIMPRO_IIC_MSG_DWORD_COUNT; i++)
+		WRITE_ONCE(ptr[i], cpu_to_le32(msg[i]));
+}
+
+static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
+{
+	if (ctx->mbox_client.tx_block || !acpi_disabled) {
+		if (!wait_for_completion_timeout(&ctx->rd_complete,
+						 msecs_to_jiffies(MAILBOX_OP_TIMEOUT)))
+			return -ETIMEDOUT;
+	}
+
+	/* Check of invalid data or no device */
+	if (*ctx->resp_msg == 0xffffffff)
+		return -ENODEV;
+
+	return 0;
+}
+
+static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
+				u32 *msg,
+				u32 *data)
+{
+	int rc;
+
+	ctx->resp_msg = data;
+
+	if (!acpi_disabled) {
+		reinit_completion(&ctx->rd_complete);
+		slimpro_i2c_pcc_tx_prepare(ctx, msg);
+	}
+
+	rc = mbox_send_message(ctx->mbox_chan, msg);
+	if (rc < 0)
+		goto err;
+
+	rc = start_i2c_msg_xfer(ctx);
+
+err:
+	if (!acpi_disabled)
+		mbox_chan_txdone(ctx->mbox_chan, 0);
+
+	ctx->resp_msg = NULL;
+
+	return rc;
+}
+
+static int slimpro_i2c_rd(struct slimpro_i2c_dev *ctx, u32 chip,
+			  u32 addr, u32 addrlen, u32 protocol,
+			  u32 readlen, u32 *data)
+{
+	u32 msg[3];
+
+	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
+					SLIMPRO_IIC_READ, protocol, addrlen, readlen);
+	msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
+	msg[2] = 0;
+
+	return slimpro_i2c_send_msg(ctx, msg, data);
+}
+
+static int slimpro_i2c_wr(struct slimpro_i2c_dev *ctx, u32 chip,
+			  u32 addr, u32 addrlen, u32 protocol, u32 writelen,
+			  u32 data)
+{
+	u32 msg[3];
+
+	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
+					SLIMPRO_IIC_WRITE, protocol, addrlen, writelen);
+	msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
+	msg[2] = data;
+
+	return slimpro_i2c_send_msg(ctx, msg, msg);
+}
+
+static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
+			     u32 addrlen, u32 protocol, u32 readlen,
+			     u32 with_data_len, void *data)
+{
+	dma_addr_t paddr;
+	u32 msg[3];
+	int rc;
+
+	paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen, DMA_FROM_DEVICE);
+	if (dma_mapping_error(ctx->dev, paddr)) {
+		dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
+			ctx->dma_buffer);
+		return -ENOMEM;
+	}
+
+	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_READ,
+					protocol, addrlen, readlen);
+	msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
+		 SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(with_data_len) |
+		 SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
+		 SLIMPRO_IIC_ENCODE_ADDR(addr);
+	msg[2] = (u32)paddr;
+
+	rc = slimpro_i2c_send_msg(ctx, msg, msg);
+
+	/* Copy to destination */
+	memcpy(data, ctx->dma_buffer, readlen);
+
+	dma_unmap_single(ctx->dev, paddr, readlen, DMA_FROM_DEVICE);
+	return rc;
+}
+
+static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
+			     u32 addr, u32 addrlen, u32 protocol, u32 writelen,
+			     void *data)
+{
+	dma_addr_t paddr;
+	u32 msg[3];
+	int rc;
+
+	if (writelen > I2C_SMBUS_BLOCK_MAX)
+		return -EINVAL;
+
+	memcpy(ctx->dma_buffer, data, writelen);
+	paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
+			       DMA_TO_DEVICE);
+	if (dma_mapping_error(ctx->dev, paddr)) {
+		dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
+			ctx->dma_buffer);
+		return -ENOMEM;
+	}
+
+	msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_WRITE,
+					protocol, addrlen, writelen);
+	msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
+		 SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
+		 SLIMPRO_IIC_ENCODE_ADDR(addr);
+	msg[2] = (u32)paddr;
+
+	if (ctx->mbox_client.tx_block)
+		reinit_completion(&ctx->rd_complete);
+
+	rc = slimpro_i2c_send_msg(ctx, msg, msg);
+
+	dma_unmap_single(ctx->dev, paddr, writelen, DMA_TO_DEVICE);
+	return rc;
+}
+
+static int xgene_slimpro_i2c_xfer(struct i2c_adapter *adap, u16 addr,
+				  unsigned short flags, char read_write,
+				  u8 command, int size,
+				  union i2c_smbus_data *data)
+{
+	struct slimpro_i2c_dev *ctx = i2c_get_adapdata(adap);
+	int ret = -EOPNOTSUPP;
+	u32 val;
+
+	switch (size) {
+	case I2C_SMBUS_BYTE:
+		if (read_write == I2C_SMBUS_READ) {
+			ret = slimpro_i2c_rd(ctx, addr, 0, 0,
+					     SLIMPRO_IIC_SMB_PROTOCOL,
+					     BYTE_DATA, &val);
+			data->byte = val;
+		} else {
+			ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
+					     SLIMPRO_IIC_SMB_PROTOCOL,
+					     0, 0);
+		}
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		if (read_write == I2C_SMBUS_READ) {
+			ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
+					     SLIMPRO_IIC_SMB_PROTOCOL,
+					     BYTE_DATA, &val);
+			data->byte = val;
+		} else {
+			val = data->byte;
+			ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
+					     SLIMPRO_IIC_SMB_PROTOCOL,
+					     BYTE_DATA, val);
+		}
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		if (read_write == I2C_SMBUS_READ) {
+			ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
+					     SLIMPRO_IIC_SMB_PROTOCOL,
+					     WORD_DATA, &val);
+			data->word = val;
+		} else {
+			val = data->word;
+			ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
+					     SLIMPRO_IIC_SMB_PROTOCOL,
+					     WORD_DATA, val);
+		}
+		break;
+	case I2C_SMBUS_BLOCK_DATA:
+		if (read_write == I2C_SMBUS_READ) {
+			ret = slimpro_i2c_blkrd(ctx, addr, command,
+						SMBUS_CMD_LEN,
+						SLIMPRO_IIC_SMB_PROTOCOL,
+						I2C_SMBUS_BLOCK_MAX + 1,
+						IIC_SMB_WITH_DATA_LEN,
+						&data->block[0]);
+
+		} else {
+			ret = slimpro_i2c_blkwr(ctx, addr, command,
+						SMBUS_CMD_LEN,
+						SLIMPRO_IIC_SMB_PROTOCOL,
+						data->block[0] + 1,
+						&data->block[0]);
+		}
+		break;
+	case I2C_SMBUS_I2C_BLOCK_DATA:
+		if (read_write == I2C_SMBUS_READ) {
+			ret = slimpro_i2c_blkrd(ctx, addr,
+						command,
+						SMBUS_CMD_LEN,
+						SLIMPRO_IIC_I2C_PROTOCOL,
+						I2C_SMBUS_BLOCK_MAX,
+						IIC_SMB_WITHOUT_DATA_LEN,
+						&data->block[1]);
+		} else {
+			ret = slimpro_i2c_blkwr(ctx, addr, command,
+						SMBUS_CMD_LEN,
+						SLIMPRO_IIC_I2C_PROTOCOL,
+						data->block[0],
+						&data->block[1]);
+		}
+		break;
+	default:
+		break;
+	}
+	return ret;
+}
+
+/*
+* Return list of supported functionality.
+*/
+static u32 xgene_slimpro_i2c_func(struct i2c_adapter *adapter)
+{
+	return I2C_FUNC_SMBUS_BYTE |
+		I2C_FUNC_SMBUS_BYTE_DATA |
+		I2C_FUNC_SMBUS_WORD_DATA |
+		I2C_FUNC_SMBUS_BLOCK_DATA |
+		I2C_FUNC_SMBUS_I2C_BLOCK;
+}
+
+static const struct i2c_algorithm xgene_slimpro_i2c_algorithm = {
+	.smbus_xfer = xgene_slimpro_i2c_xfer,
+	.functionality = xgene_slimpro_i2c_func,
+};
+
+static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
+{
+	struct slimpro_i2c_dev *ctx;
+	struct i2c_adapter *adapter;
+	struct mbox_client *cl;
+	int rc;
+
+	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->dev = &pdev->dev;
+	platform_set_drvdata(pdev, ctx);
+	cl = &ctx->mbox_client;
+
+	/* Request mailbox channel */
+	cl->dev = &pdev->dev;
+	init_completion(&ctx->rd_complete);
+	cl->tx_tout = MAILBOX_OP_TIMEOUT;
+	cl->knows_txdone = false;
+	if (acpi_disabled) {
+		cl->tx_block = true;
+		cl->rx_callback = slimpro_i2c_rx_cb;
+		ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
+		if (IS_ERR(ctx->mbox_chan)) {
+			dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
+			return PTR_ERR(ctx->mbox_chan);
+		}
+	} else {
+		struct acpi_pcct_hw_reduced *cppc_ss;
+		const struct acpi_device_id *acpi_id;
+		int version = XGENE_SLIMPRO_I2C_V1;
+
+		acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
+					    &pdev->dev);
+		if (!acpi_id)
+			return -EINVAL;
+
+		version = (int)acpi_id->driver_data;
+
+		if (device_property_read_u32(&pdev->dev, "pcc-channel",
+					     &ctx->mbox_idx))
+			ctx->mbox_idx = MAILBOX_I2C_INDEX;
+
+		cl->tx_block = false;
+		cl->rx_callback = slimpro_i2c_pcc_rx_cb;
+		ctx->mbox_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);
+		if (IS_ERR(ctx->mbox_chan)) {
+			dev_err(&pdev->dev, "PCC mailbox channel request failed\n");
+			return PTR_ERR(ctx->mbox_chan);
+		}
+
+		/*
+		 * The PCC mailbox controller driver should
+		 * have parsed the PCCT (global table of all
+		 * PCC channels) and stored pointers to the
+		 * subspace communication region in con_priv.
+		 */
+		cppc_ss = ctx->mbox_chan->con_priv;
+		if (!cppc_ss) {
+			dev_err(&pdev->dev, "PPC subspace not found\n");
+			rc = -ENOENT;
+			goto mbox_err;
+		}
+
+		if (!ctx->mbox_chan->mbox->txdone_irq) {
+			dev_err(&pdev->dev, "PCC IRQ not supported\n");
+			rc = -ENOENT;
+			goto mbox_err;
+		}
+
+		/*
+		 * This is the shared communication region
+		 * for the OS and Platform to communicate over.
+		 */
+		ctx->comm_base_addr = cppc_ss->base_address;
+		if (ctx->comm_base_addr) {
+			if (version == XGENE_SLIMPRO_I2C_V2)
+				ctx->pcc_comm_addr = memremap(
+							ctx->comm_base_addr,
+							cppc_ss->length,
+							MEMREMAP_WT);
+			else
+				ctx->pcc_comm_addr = memremap(
+							ctx->comm_base_addr,
+							cppc_ss->length,
+							MEMREMAP_WB);
+		} else {
+			dev_err(&pdev->dev, "Failed to get PCC comm region\n");
+			rc = -ENOENT;
+			goto mbox_err;
+		}
+
+		if (!ctx->pcc_comm_addr) {
+			dev_err(&pdev->dev,
+				"Failed to ioremap PCC comm region\n");
+			rc = -ENOMEM;
+			goto mbox_err;
+		}
+	}
+	rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (rc)
+		dev_warn(&pdev->dev, "Unable to set dma mask\n");
+
+	/* Setup I2C adapter */
+	adapter = &ctx->adapter;
+	snprintf(adapter->name, sizeof(adapter->name), "MAILBOX I2C");
+	adapter->algo = &xgene_slimpro_i2c_algorithm;
+	adapter->class = I2C_CLASS_HWMON;
+	adapter->dev.parent = &pdev->dev;
+	adapter->dev.of_node = pdev->dev.of_node;
+	ACPI_COMPANION_SET(&adapter->dev, ACPI_COMPANION(&pdev->dev));
+	i2c_set_adapdata(adapter, ctx);
+	rc = i2c_add_adapter(adapter);
+	if (rc)
+		goto mbox_err;
+
+	dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");
+	return 0;
+
+mbox_err:
+	if (acpi_disabled)
+		mbox_free_channel(ctx->mbox_chan);
+	else
+		pcc_mbox_free_channel(ctx->mbox_chan);
+
+	return rc;
+}
+
+static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
+{
+	struct slimpro_i2c_dev *ctx = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(&ctx->adapter);
+
+	if (acpi_disabled)
+		mbox_free_channel(ctx->mbox_chan);
+	else
+		pcc_mbox_free_channel(ctx->mbox_chan);
+
+	return 0;
+}
+
+static const struct of_device_id xgene_slimpro_i2c_dt_ids[] = {
+	{.compatible = "apm,xgene-slimpro-i2c" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, xgene_slimpro_i2c_dt_ids);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_slimpro_i2c_acpi_ids[] = {
+	{"APMC0D40", XGENE_SLIMPRO_I2C_V1},
+	{"APMC0D8B", XGENE_SLIMPRO_I2C_V2},
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, xgene_slimpro_i2c_acpi_ids);
+#endif
+
+static struct platform_driver xgene_slimpro_i2c_driver = {
+	.probe	= xgene_slimpro_i2c_probe,
+	.remove	= xgene_slimpro_i2c_remove,
+	.driver	= {
+		.name	= "xgene-slimpro-i2c",
+		.of_match_table = of_match_ptr(xgene_slimpro_i2c_dt_ids),
+		.acpi_match_table = ACPI_PTR(xgene_slimpro_i2c_acpi_ids)
+	},
+};
+
+module_platform_driver(xgene_slimpro_i2c_driver);
+
+MODULE_DESCRIPTION("APM X-Gene SLIMpro I2C driver");
+MODULE_AUTHOR("Feng Kan <fkan@apm.com>");
+MODULE_AUTHOR("Hieu Le <hnle@apm.com>");
+MODULE_LICENSE("GPL");