driver: brcm: add i2c driver
Broadcom I2C controller driver. Follwoing API's are supported:-
- i2c_init() Intialize ethe I2C controller
- i2c_probe()
- i2c_set_bus_speed() Set the I2C bus speed
- i2c_get_bus_speed() Get the current bus speed
- i2c_recv_byte() Receive one byte of data.
- i2c_send_byte() Send one byteof data
- i2c_read_byte() Read single byte of data
- i2c_read() Read multiple bytes of data
- i2c_write_byte Write single byte of data
- i2c_write() Write multiple bytes of data
This driver is verified by reading the DDR SPD data.
Signed-off-by: Bharat Gooty <bharat.gooty@broadcom.com>
Change-Id: I2d7fe53950e8b12fab19d0293020523ff8b74e13
diff --git a/drivers/brcm/i2c/i2c.c b/drivers/brcm/i2c/i2c.c
new file mode 100644
index 0000000..2096a82
--- /dev/null
+++ b/drivers/brcm/i2c/i2c.c
@@ -0,0 +1,886 @@
+/*
+ * Copyright (c) 2016 - 2021, Broadcom
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <i2c.h>
+#include <i2c_regs.h>
+#include <lib/mmio.h>
+
+#include <platform_def.h>
+
+/* Max instances */
+#define MAX_I2C 2U
+
+/* Transaction error codes defined in Master command register (0x30) */
+#define MSTR_STS_XACT_SUCCESS 0U
+#define MSTR_STS_LOST_ARB 1U
+#define MSTR_STS_NACK_FIRST_BYTE 2U
+ /* NACK on a byte other than the first byte */
+#define MSTR_STS_NACK_NON_FIRST_BYTE 3U
+
+#define MSTR_STS_TTIMEOUT_EXCEEDED 4U
+#define MSTR_STS_TX_TLOW_MEXT_EXCEEDED 5U
+#define MSTR_STS_RX_TLOW_MEXT_EXCEEDED 6U
+
+/* SMBUS protocol values defined in register 0x30 */
+#define SMBUS_PROT_QUICK_CMD 0U
+#define SMBUS_PROT_SEND_BYTE 1U
+#define SMBUS_PROT_RECV_BYTE 2U
+#define SMBUS_PROT_WR_BYTE 3U
+#define SMBUS_PROT_RD_BYTE 4U
+#define SMBUS_PROT_WR_WORD 5U
+#define SMBUS_PROT_RD_WORD 6U
+#define SMBUS_PROT_BLK_WR 7U
+#define SMBUS_PROT_BLK_RD 8U
+#define SMBUS_PROT_PROC_CALL 9U
+#define SMBUS_PROT_BLK_WR_BLK_RD_PROC_CALL 10U
+
+/* Number can be changed later */
+#define BUS_BUSY_COUNT 100000U
+
+#define IPROC_I2C_INVALID_ADDR 0xFFU
+
+#define I2C_SMBUS_BLOCK_MAX 32U
+
+/*
+ * Enum to specify clock speed. The user will provide it during initialization.
+ * If needed, it can be changed dynamically
+ */
+typedef enum iproc_smb_clk_freq {
+ IPROC_SMB_SPEED_100KHz = 0,
+ IPROC_SMB_SPEED_400KHz = 1,
+ IPROC_SMB_SPEED_INVALID = 255
+} smb_clk_freq_t;
+
+/* Structure used to pass information to read/write functions. */
+struct iproc_xact_info {
+ /* Bus Identifier */
+ uint32_t bus_id;
+ /* Device Address */
+ uint8_t devaddr;
+ /* Passed by caller to send SMBus command cod e*/
+ uint8_t command;
+ /* actual data passed by the caller */
+ uint8_t *data;
+ /* Size of data buffer passed */
+ uint32_t size;
+ /* Sent by caller specifying PEC, 10-bit addresses */
+ uint16_t flags;
+ /* SMBus protocol to use to perform transaction */
+ uint8_t smb_proto;
+ /* true if command field below is valid. Otherwise, false */
+ uint32_t cmd_valid;
+};
+
+static const uintptr_t smbus_base_reg_addr[MAX_I2C] = {
+ SMBUS0_REGS_BASE,
+ SMBUS1_REGS_BASE
+};
+
+/* Function to read a value from specified register. */
+static uint32_t iproc_i2c_reg_read(uint32_t bus_id, unsigned long reg_addr)
+{
+ uint32_t val;
+ uintptr_t smbus;
+
+ smbus = smbus_base_reg_addr[bus_id];
+
+ val = mmio_read_32(smbus + reg_addr);
+ VERBOSE("i2c %u: reg %p read 0x%x\n", bus_id,
+ (void *)(smbus + reg_addr), val);
+ return val;
+}
+
+/* Function to write a value ('val') in to a specified register. */
+static void iproc_i2c_reg_write(uint32_t bus_id,
+ unsigned long reg_addr,
+ uint32_t val)
+{
+ uintptr_t smbus;
+
+ smbus = smbus_base_reg_addr[bus_id];
+
+ mmio_write_32((smbus + reg_addr), val);
+ VERBOSE("i2c %u: reg %p wrote 0x%x\n", bus_id,
+ (void *)(smbus + reg_addr), val);
+}
+
+/* Function to clear and set bits in a specified register. */
+static void iproc_i2c_reg_clearset(uint32_t bus_id,
+ unsigned long reg_addr,
+ uint32_t clear,
+ uint32_t set)
+{
+ uintptr_t smbus;
+
+ smbus = smbus_base_reg_addr[bus_id];
+
+ mmio_clrsetbits_32((smbus + reg_addr), clear, set);
+ VERBOSE("i2c %u: reg %p clear 0x%x, set 0x%x\n", bus_id,
+ (void *)(smbus + reg_addr), clear, set);
+}
+
+/* Function to dump all SMBUS register */
+#ifdef BCM_I2C_DEBUG
+static int iproc_dump_i2c_regs(uint32_t bus_id)
+{
+ uint32_t regval;
+
+ if (bus_id > MAX_I2C) {
+ return -1;
+ }
+
+ INFO("----------------------------------------------\n");
+ INFO("%s: Dumping SMBus %u registers...\n", __func__, bus_id);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_CFG_REG);
+ INFO("SMB_CFG_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_TIMGCFG_REG);
+ INFO("SMB_TIMGCFG_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_ADDR_REG);
+ INFO("SMB_ADDR_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_MSTRFIFOCTL_REG);
+ INFO("SMB_MSTRFIFOCTL_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_SLVFIFOCTL_REG);
+ INFO("SMB_SLVFIFOCTL_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_BITBANGCTL_REG);
+ INFO("SMB_BITBANGCTL_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_MSTRCMD_REG);
+ INFO("SMB_MSTRCMD_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_SLVCMD_REG);
+ INFO("SMB_SLVCMD_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_EVTEN_REG);
+ INFO("SMB_EVTEN_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_EVTSTS_REG);
+ INFO("SMB_EVTSTS_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_MSTRDATAWR_REG);
+ INFO("SMB_MSTRDATAWR_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_MSTRDATARD_REG);
+ INFO("SMB_MSTRDATARD_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_SLVDATAWR_REG);
+ INFO("SMB_SLVDATAWR_REG=0x%x\n", regval);
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_SLVDATARD_REG);
+ INFO("SMB_SLVDATARD_REG=0x%x\n", regval);
+
+ INFO("----------------------------------------------\n");
+ return 0;
+}
+#endif
+
+/*
+ * Function to ensure that the previous transaction was completed before
+ * initiating a new transaction. It can also be used in polling mode to
+ * check status of completion of a command
+ */
+static int iproc_i2c_startbusy_wait(uint32_t bus_id)
+{
+ uint32_t regval;
+ uint32_t retry = 0U;
+
+ /*
+ * Check if an operation is in progress. During probe it won't be.
+ * Want to make sure that the transaction in progress is completed.
+ */
+ do {
+ udelay(1U);
+ regval = iproc_i2c_reg_read(bus_id, SMB_MSTRCMD_REG);
+ regval &= SMB_MSTRSTARTBUSYCMD_MASK;
+ if (retry++ > BUS_BUSY_COUNT) {
+ ERROR("%s: START_BUSY bit didn't clear, exiting\n",
+ __func__);
+ return -1;
+ }
+
+ } while (regval != 0U);
+
+ return 0;
+}
+
+/*
+ * This function copies data to SMBus's Tx FIFO. Valid for write transactions
+ * info: Data to copy in to Tx FIFO. For read commands, the size should be
+ * set to zero by the caller
+ */
+static void iproc_i2c_write_trans_data(struct iproc_xact_info *info)
+{
+ uint32_t regval;
+ uint8_t devaddr;
+ uint32_t i;
+ uint32_t num_data_bytes = 0U;
+
+#ifdef BCM_I2C_DEBUG
+ INFO("%s:dev_addr=0x%x,cmd_valid=%d, cmd=0x%x, size=%u proto=%d\n",
+ __func__, info->devaddr, info->cmd_valid, info->command,
+ info->size, info->smb_proto);
+#endif
+ /* Shift devaddr by 1 bit since SMBus uses the low bit[0] for R/W_n */
+ devaddr = (info->devaddr << 1);
+
+ /*
+ * Depending on the SMBus protocol, we need to write additional
+ * transaction data in to Tx FIFO. Refer to section 5.5 of SMBus spec
+ * for sequence for a transaction
+ */
+ switch (info->smb_proto) {
+ case SMBUS_PROT_RECV_BYTE:
+ /* No additional data to be written */
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ devaddr | 0x1U | SMB_MSTRWRSTS_MASK);
+ break;
+ case SMBUS_PROT_SEND_BYTE:
+ num_data_bytes = info->size;
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ devaddr);
+ break;
+ case SMBUS_PROT_RD_BYTE:
+ case SMBUS_PROT_RD_WORD:
+ case SMBUS_PROT_BLK_RD:
+ /* Write slave address with R/W~ set (bit #0) */
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ devaddr | 0x1U);
+ break;
+ case SMBUS_PROT_BLK_WR_BLK_RD_PROC_CALL:
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ devaddr | 0x1U | SMB_MSTRWRSTS_MASK);
+ break;
+ case SMBUS_PROT_WR_BYTE:
+ case SMBUS_PROT_WR_WORD:
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ devaddr);
+ /*
+ * No additional bytes to be written. Data portion is written
+ * in the 'for' loop below
+ */
+ num_data_bytes = info->size;
+ break;
+ case SMBUS_PROT_BLK_WR:
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ devaddr);
+ /* 3rd byte is byte count */
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ info->size);
+ num_data_bytes = info->size;
+ break;
+ default:
+ return;
+ }
+
+ /* If the protocol needs command code, copy it */
+ if (info->cmd_valid) {
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ info->command);
+ }
+
+ /*
+ * Copy actual data from caller. In general, for reads,
+ * no data is copied.
+ */
+ for (i = 0U; num_data_bytes; --num_data_bytes, i++) {
+ /* For the last byte, set MASTER_WR_STATUS bit */
+ regval = (num_data_bytes == 1U) ?
+ info->data[i] | SMB_MSTRWRSTS_MASK : info->data[i];
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRDATAWR_REG,
+ regval);
+ }
+}
+
+/*
+ * This function writes to the master command register and
+ * then polls for completion
+ */
+static int iproc_i2c_write_master_command(uint32_t mastercmd,
+ struct iproc_xact_info *info)
+{
+ uint32_t retry = 0U;
+ uint32_t regval;
+
+ iproc_i2c_reg_write(info->bus_id, SMB_MSTRCMD_REG, mastercmd);
+
+ /* Check for Master Busy status */
+ regval = iproc_i2c_reg_read(info->bus_id, SMB_MSTRCMD_REG);
+ while ((regval & SMB_MSTRSTARTBUSYCMD_MASK) != 0U) {
+ udelay(1U);
+ if (retry++ > BUS_BUSY_COUNT) {
+ ERROR("%s: START_BUSY bit didn't clear, exiting\n",
+ __func__);
+ return -1;
+ }
+ regval = iproc_i2c_reg_read(info->bus_id, SMB_MSTRCMD_REG);
+ }
+
+ /* If start_busy bit cleared, check if there are any errors */
+ if (!(regval & SMB_MSTRSTARTBUSYCMD_MASK)) {
+ /* start_busy bit cleared, check master_status field now */
+ regval &= SMB_MSTRSTS_MASK;
+ regval >>= SMB_MSTRSTS_SHIFT;
+ if (regval != MSTR_STS_XACT_SUCCESS) {
+ /* Error We can flush Tx FIFO here */
+ ERROR("%s: ERROR: %u exiting\n", __func__, regval);
+ return -1;
+ }
+ }
+ return 0;
+
+}
+/* Function to initiate data send and verify completion status */
+static int iproc_i2c_data_send(struct iproc_xact_info *info)
+{
+ int rc;
+ uint32_t mastercmd;
+
+ /* Make sure the previous transaction completed */
+ rc = iproc_i2c_startbusy_wait(info->bus_id);
+
+ if (rc < 0) {
+ WARN("%s: Send: bus is busy, exiting\n", __func__);
+ return rc;
+ }
+ /* Write transaction bytes to Tx FIFO */
+ iproc_i2c_write_trans_data(info);
+
+ /*
+ * Program master command register (0x30) with protocol type and set
+ * start_busy_command bit to initiate the write transaction
+ */
+ mastercmd = (info->smb_proto << SMB_MSTRSMBUSPROTO_SHIFT) |
+ SMB_MSTRSTARTBUSYCMD_MASK;
+
+ if (iproc_i2c_write_master_command(mastercmd, info)) {
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Function to initiate data receive, verify completion status,
+ * and read from SMBUS Read FIFO
+ */
+static int iproc_i2c_data_recv(struct iproc_xact_info *info,
+ uint32_t *num_bytes_read)
+{
+ int rc;
+ uint32_t mastercmd;
+ uint32_t regval;
+
+ /* Make sure the previous transaction completed */
+ rc = iproc_i2c_startbusy_wait(info->bus_id);
+
+ if (rc < 0) {
+ WARN("%s: Receive: Bus is busy, exiting\n", __func__);
+ return rc;
+ }
+
+ /* Program all transaction bytes into master Tx FIFO */
+ iproc_i2c_write_trans_data(info);
+
+ /*
+ * Program master command register (0x30) with protocol type and set
+ * start_busy_command bit to initiate the write transaction
+ */
+ mastercmd = (info->smb_proto << SMB_MSTRSMBUSPROTO_SHIFT) |
+ SMB_MSTRSTARTBUSYCMD_MASK | info->size;
+
+ if (iproc_i2c_write_master_command(mastercmd, info)) {
+ return -1;
+ }
+
+ /* Read received byte(s), after TX out address etc */
+ regval = iproc_i2c_reg_read(info->bus_id, SMB_MSTRDATARD_REG);
+
+ /* For block read, protocol (hw) returns byte count,as the first byte */
+ if (info->smb_proto == SMBUS_PROT_BLK_RD) {
+ uint32_t i;
+
+ *num_bytes_read = regval & SMB_MSTRRDDATA_MASK;
+ /*
+ * Limit to reading a max of 32 bytes only; just a safeguard.
+ * If # bytes read is a number > 32, check transaction set up,
+ * and contact hw engg.
+ * Assumption: PEC is disabled
+ */
+ for (i = 0U; (i < *num_bytes_read) &&
+ (i < I2C_SMBUS_BLOCK_MAX); i++) {
+ /* Read Rx FIFO for data bytes */
+ regval = iproc_i2c_reg_read(info->bus_id,
+ SMB_MSTRDATARD_REG);
+ info->data[i] = regval & SMB_MSTRRDDATA_MASK;
+ }
+ } else {
+ /* 1 Byte data */
+ *info->data = regval & SMB_MSTRRDDATA_MASK;
+ *num_bytes_read = 1U;
+ }
+
+ return 0;
+}
+
+/*
+ * This function set clock frequency for SMBus block. As per hardware
+ * engineering, the clock frequency can be changed dynamically.
+ */
+static int iproc_i2c_set_clk_freq(uint32_t bus_id, smb_clk_freq_t freq)
+{
+ uint32_t val;
+
+ switch (freq) {
+ case IPROC_SMB_SPEED_100KHz:
+ val = 0U;
+ break;
+ case IPROC_SMB_SPEED_400KHz:
+ val = 1U;
+ break;
+ default:
+ return -1;
+ }
+
+ iproc_i2c_reg_clearset(bus_id, SMB_TIMGCFG_REG,
+ SMB_TIMGCFG_MODE400_MASK,
+ val << SMB_TIMGCFG_MODE400_SHIFT);
+
+ return 0;
+}
+
+/* Helper function to fill the iproc_xact_info structure */
+static void iproc_i2c_fill_info(struct iproc_xact_info *info, uint32_t bus_id,
+ uint8_t devaddr, uint8_t cmd, uint8_t *value,
+ uint8_t smb_proto, uint32_t cmd_valid)
+{
+ info->bus_id = bus_id;
+ info->devaddr = devaddr;
+ info->command = (uint8_t)cmd;
+ info->smb_proto = smb_proto;
+ info->data = value;
+ info->size = 1U;
+ info->flags = 0U;
+ info->cmd_valid = cmd_valid;
+}
+
+/* This function initializes the SMBUS */
+static void iproc_i2c_init(uint32_t bus_id, int speed)
+{
+ uint32_t regval;
+
+#ifdef BCM_I2C_DEBUG
+ INFO("%s: Enter Init\n", __func__);
+#endif
+
+ /* Put controller in reset */
+ regval = iproc_i2c_reg_read(bus_id, SMB_CFG_REG);
+ regval |= BIT(SMB_CFG_RST_SHIFT);
+ regval &= ~(BIT(SMB_CFG_SMBEN_SHIFT));
+ iproc_i2c_reg_write(bus_id, SMB_CFG_REG, regval);
+
+ /* Wait 100 usec per spec */
+ udelay(100U);
+
+ /* Bring controller out of reset */
+ regval &= ~(BIT(SMB_CFG_RST_SHIFT));
+ iproc_i2c_reg_write(bus_id, SMB_CFG_REG, regval);
+
+ /*
+ * Flush Tx, Rx FIFOs. Note we are setting the Rx FIFO threshold to 0.
+ * May be OK since we are setting RX_EVENT and RX_FIFO_FULL interrupts
+ */
+ regval = SMB_MSTRRXFIFOFLSH_MASK | SMB_MSTRTXFIFOFLSH_MASK;
+ iproc_i2c_reg_write(bus_id, SMB_MSTRFIFOCTL_REG, regval);
+
+ /*
+ * Enable SMbus block. Note, we are setting MASTER_RETRY_COUNT to zero
+ * since there will be only one master
+ */
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_CFG_REG);
+ regval |= SMB_CFG_SMBEN_MASK;
+ iproc_i2c_reg_write(bus_id, SMB_CFG_REG, regval);
+ /* Wait a minimum of 50 Usec, as per SMB hw doc. But we wait longer */
+ mdelay(10U);
+
+ /* If error then set default speed */
+ if (i2c_set_bus_speed(bus_id, speed)) {
+ i2c_set_bus_speed(bus_id, I2C_SPEED_DEFAULT);
+ }
+
+ /* Disable intrs */
+ regval = 0x0U;
+ iproc_i2c_reg_write(bus_id, SMB_EVTEN_REG, regval);
+
+ /* Clear intrs (W1TC) */
+ regval = iproc_i2c_reg_read(bus_id, SMB_EVTSTS_REG);
+ iproc_i2c_reg_write(bus_id, SMB_EVTSTS_REG, regval);
+
+#ifdef BCM_I2C_DEBUG
+ iproc_dump_i2c_regs(bus_id);
+
+ INFO("%s: Exit Init Successfully\n", __func__);
+#endif
+}
+
+/*
+ * Function Name: i2c_init
+ *
+ * Description:
+ * This function initializes the SMBUS.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * speed - I2C bus speed in Hz
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_init(uint32_t bus_id, int speed)
+{
+ if (bus_id > MAX_I2C) {
+ WARN("%s: Invalid Bus %u\n", __func__, bus_id);
+ return -1;
+ }
+
+ iproc_i2c_init(bus_id, speed);
+ return 0U;
+}
+
+/*
+ * Function Name: i2c_probe
+ *
+ * Description:
+ * This function probes the I2C bus for the existence of the specified
+ * device.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_probe(uint32_t bus_id, uint8_t devaddr)
+{
+ uint32_t regval;
+ int rc;
+
+ /*
+ * i2c_init() Initializes internal regs, disable intrs (and then clear intrs),
+ * set fifo thresholds, etc.
+ * Shift devaddr by 1 bit since SMBus uses the low bit[0] for R/W_n
+ */
+ regval = (devaddr << 1U);
+ iproc_i2c_reg_write(bus_id, SMB_MSTRDATAWR_REG, regval);
+
+ regval = ((SMBUS_PROT_QUICK_CMD << SMB_MSTRSMBUSPROTO_SHIFT) |
+ SMB_MSTRSTARTBUSYCMD_MASK);
+ iproc_i2c_reg_write(bus_id, SMB_MSTRCMD_REG, regval);
+
+ rc = iproc_i2c_startbusy_wait(bus_id);
+
+ if (rc < 0) {
+ WARN("%s: Probe: bus is busy, exiting\n", __func__);
+ return rc;
+ }
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_MSTRCMD_REG);
+ if (((regval & SMB_MSTRSTS_MASK) >> SMB_MSTRSTS_SHIFT) == 0)
+ VERBOSE("i2c device address: 0x%x\n", devaddr);
+ else
+ return -1;
+
+#ifdef BCM_I2C_DEBUG
+ iproc_dump_i2c_regs(bus_id);
+#endif
+ return 0;
+}
+
+/*
+ * Function Name: i2c_recv_byte
+ *
+ * Description:
+ * This function reads I2C data from a device without specifying
+ * a command regsiter.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ * value - Data Read
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_recv_byte(uint32_t bus_id, uint8_t devaddr, uint8_t *value)
+{
+ int rc;
+ struct iproc_xact_info info;
+ uint32_t num_bytes_read = 0;
+
+ iproc_i2c_fill_info(&info, bus_id, devaddr, 0U, value,
+ SMBUS_PROT_RECV_BYTE, 0U);
+
+ /* Refer to i2c_smbus_read_byte for params passed. */
+ rc = iproc_i2c_data_recv(&info, &num_bytes_read);
+
+ if (rc < 0) {
+ printf("%s: %s error accessing device 0x%x\n",
+ __func__, "Read", devaddr);
+ }
+
+ return rc;
+}
+
+/*
+ * Function Name: i2c_send_byte
+ *
+ * Description:
+ * This function send I2C data to a device without specifying
+ * a command regsiter.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ * value - Data Send
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_send_byte(uint32_t bus_id, uint8_t devaddr, uint8_t value)
+{
+ int rc;
+ struct iproc_xact_info info;
+
+ iproc_i2c_fill_info(&info, bus_id, devaddr, 0U, &value,
+ SMBUS_PROT_SEND_BYTE, 0U);
+
+ /* Refer to i2c_smbus_write_byte params passed. */
+ rc = iproc_i2c_data_send(&info);
+
+ if (rc < 0) {
+ ERROR("%s: %s error accessing device 0x%x\n",
+ __func__, "Write", devaddr);
+ }
+
+ return rc;
+}
+
+/* Helper function to read a single byte */
+static int i2c_read_byte(uint32_t bus_id,
+ uint8_t devaddr,
+ uint8_t regoffset,
+ uint8_t *value)
+{
+ int rc;
+ struct iproc_xact_info info;
+ uint32_t num_bytes_read = 0U;
+
+ iproc_i2c_fill_info(&info, bus_id, devaddr, regoffset, value,
+ SMBUS_PROT_RD_BYTE, 1U);
+
+ /* Refer to i2c_smbus_read_byte for params passed. */
+ rc = iproc_i2c_data_recv(&info, &num_bytes_read);
+
+ if (rc < 0) {
+ ERROR("%s: %s error accessing device 0x%x\n",
+ __func__, "Read", devaddr);
+ }
+ return rc;
+}
+
+/*
+ * Function Name: i2c_read
+ *
+ * Description:
+ * This function reads I2C data from a device with a designated
+ * command register
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ * addr - Register Offset
+ * alen - Address Length, 1 for byte, 2 for word (not supported)
+ * buffer - Data Buffer
+ * len - Data Length in bytes
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_read(uint32_t bus_id,
+ uint8_t devaddr,
+ uint32_t addr,
+ int alen,
+ uint8_t *buffer,
+ int len)
+{
+ uint32_t i;
+
+ if (alen > 1) {
+ WARN("I2C read: addr len %d not supported\n", alen);
+ return -1;
+ }
+
+ if (addr + len > 256) {
+ WARN("I2C read: address out of range\n");
+ return -1;
+ }
+
+ for (i = 0U; i < len; i++) {
+ if (i2c_read_byte(bus_id, devaddr, addr + i, &buffer[i])) {
+ ERROR("I2C read: I/O error\n");
+ iproc_i2c_init(bus_id, i2c_get_bus_speed(bus_id));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/* Helper function to write a single byte */
+static int i2c_write_byte(uint32_t bus_id,
+ uint8_t devaddr,
+ uint8_t regoffset,
+ uint8_t value)
+{
+ int rc;
+ struct iproc_xact_info info;
+
+ iproc_i2c_fill_info(&info, bus_id, devaddr, regoffset, &value,
+ SMBUS_PROT_WR_BYTE, 1U);
+
+ /* Refer to i2c_smbus_write_byte params passed. */
+ rc = iproc_i2c_data_send(&info);
+
+ if (rc < 0) {
+ ERROR("%s: %s error accessing device 0x%x\n",
+ __func__, "Write", devaddr);
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Function Name: i2c_write
+ *
+ * Description:
+ * This function write I2C data to a device with a designated
+ * command register
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ * addr - Register Offset
+ * alen - Address Length, 1 for byte, 2 for word (not supported)
+ * buffer - Data Buffer
+ * len - Data Length in bytes
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_write(uint32_t bus_id,
+ uint8_t devaddr,
+ uint32_t addr,
+ int alen,
+ uint8_t *buffer,
+ int len)
+{
+ uint32_t i;
+
+ if (alen > 1) {
+ WARN("I2C write: addr len %d not supported\n", alen);
+ return -1;
+ }
+
+ if (addr + len > 256U) {
+ WARN("I2C write: address out of range\n");
+ return -1;
+ }
+
+ for (i = 0U; i < len; i++) {
+ if (i2c_write_byte(bus_id, devaddr, addr + i, buffer[i])) {
+ ERROR("I2C write: I/O error\n");
+ iproc_i2c_init(bus_id, i2c_get_bus_speed(bus_id));
+ return -1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Function Name: i2c_set_bus_speed
+ *
+ * Description:
+ * This function configures the SMBUS speed
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * speed - I2C bus speed in Hz
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_set_bus_speed(uint32_t bus_id, uint32_t speed)
+{
+ switch (speed) {
+ case I2C_SPEED_100KHz:
+ iproc_i2c_set_clk_freq(bus_id, IPROC_SMB_SPEED_100KHz);
+ break;
+
+ case I2C_SPEED_400KHz:
+ iproc_i2c_set_clk_freq(bus_id, IPROC_SMB_SPEED_400KHz);
+ break;
+
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * Function Name: i2c_get_bus_speed
+ *
+ * Description:
+ * This function returns the SMBUS speed.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ *
+ * Return:
+ * Bus speed in Hz, 0 on failure
+ */
+uint32_t i2c_get_bus_speed(uint32_t bus_id)
+{
+ uint32_t regval;
+ uint32_t retval = 0U;
+
+ regval = iproc_i2c_reg_read(bus_id, SMB_TIMGCFG_REG);
+ regval &= SMB_TIMGCFG_MODE400_MASK;
+ regval >>= SMB_TIMGCFG_MODE400_SHIFT;
+
+ switch (regval) {
+ case IPROC_SMB_SPEED_100KHz:
+ retval = I2C_SPEED_100KHz;
+ break;
+
+ case IPROC_SMB_SPEED_400KHz:
+ retval = I2C_SPEED_400KHz;
+ break;
+
+ default:
+ break;
+ }
+ return retval;
+}
+
diff --git a/include/drivers/brcm/i2c/i2c.h b/include/drivers/brcm/i2c/i2c.h
new file mode 100644
index 0000000..24d42e2
--- /dev/null
+++ b/include/drivers/brcm/i2c/i2c.h
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2016 - 2021, Broadcom
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef I2C_H
+#define I2C_H
+
+#include <stdint.h>
+
+#define I2C_SPEED_100KHz 100000
+#define I2C_SPEED_400KHz 400000
+#define I2C_SPEED_DEFAULT I2C_SPEED_100KHz
+
+/*
+ * Function Name: i2c_probe
+ *
+ * Description:
+ * This function probes the I2C bus for the existence of the specified
+ * device.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_probe(uint32_t bus_id, uint8_t devaddr);
+
+/*
+ * Function Name: i2c_init
+ *
+ * Description:
+ * This function initializes the SMBUS.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * speed - I2C bus speed in Hz
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_init(uint32_t bus_id, int speed);
+
+/*
+ * Function Name: i2c_set_bus_speed
+ *
+ * Description:
+ * This function configures the SMBUS speed
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * speed - I2C bus speed in Hz
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_set_bus_speed(uint32_t bus_id, uint32_t speed);
+
+/*
+ * Function Name: i2c_get_bus_speed
+ *
+ * Description:
+ * This function returns the SMBUS speed.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ *
+ * Return:
+ * Bus speed in Hz, 0 on failure
+ */
+uint32_t i2c_get_bus_speed(uint32_t bus_id);
+
+/*
+ * Function Name: i2c_recv_byte
+ *
+ * Description:
+ * This function reads I2C data from a device without specifying
+ * a command regsiter.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ * value - Data Read
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_recv_byte(uint32_t bus_id, uint8_t devaddr, uint8_t *value);
+
+/*
+ * Function Name: i2c_send_byte
+ *
+ * Description:
+ * This function send I2C data to a device without specifying
+ * a command regsiter.
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ * value - Data Send
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_send_byte(uint32_t bus_id, uint8_t devaddr, uint8_t value);
+
+/*
+ * Function Name: i2c_read
+ *
+ * Description:
+ * This function reads I2C data from a device with a designated
+ * command register
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ * addr - Register Offset
+ * alen - Address Length, 1 for byte, 2 for word (not supported)
+ * buffer - Data Buffer
+ * len - Data Length in bytes
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_read(uint32_t bus_id,
+ uint8_t devaddr,
+ uint32_t addr,
+ int alen,
+ uint8_t *buffer,
+ int len);
+
+/*
+ * Function Name: i2c_write
+ *
+ * Description:
+ * This function write I2C data to a device with a designated
+ * command register
+ *
+ * Parameters:
+ * bus_id - I2C bus ID
+ * devaddr - Device Address
+ * addr - Register Offset
+ * alen - Address Length, 1 for byte, 2 for word (not supported)
+ * buffer - Data Buffer
+ * len - Data Length in bytes
+ *
+ * Return:
+ * 0 on success, or -1 on failure.
+ */
+int i2c_write(uint32_t bus_id,
+ uint8_t devaddr,
+ uint32_t addr,
+ int alen,
+ uint8_t *buffer,
+ int len);
+
+
+#endif /* I2C_H */
diff --git a/include/drivers/brcm/i2c/i2c_regs.h b/include/drivers/brcm/i2c/i2c_regs.h
new file mode 100644
index 0000000..74ea824
--- /dev/null
+++ b/include/drivers/brcm/i2c/i2c_regs.h
@@ -0,0 +1,271 @@
+/*
+ * Copyright (c) 2016 - 2021, Broadcom
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef I2C_REGS
+#define I2C_REGS
+
+/* SMBUS Config register */
+#define SMB_CFG_REG 0x0U
+
+#define SMB_CFG_RST_MASK 0x80000000U
+#define SMB_CFG_RST_SHIFT 31U
+
+#define SMB_CFG_SMBEN_MASK 0x40000000U
+#define SMB_CFG_SMBEN_SHIFT 30U
+
+#define SMB_CFG_BITBANGEN_MASK 0x20000000U
+#define SMB_CFG_BITBANGEN_SHIFT 29U
+
+#define SMB_CFG_EN_NIC_SMBADDR0_MASK 0x10000000U
+#define SMB_CFG_EN_NIC_SMBADDR0_SHIFT 28U
+
+#define SMB_CFG_PROMISCMODE_MASK 0x08000000U
+#define SMB_CFG_PROMISCMODE_SHIFT 27U
+
+#define SMB_CFG_TSTMPCNTEN_MASK 0x04000000U
+#define SMB_CFG_TSTMPCNTEN_SHIFT 26U
+
+#define SMB_CFG_MSTRRTRYCNT_MASK 0x000F0000U
+#define SMB_CFG_MSTRRTRYCNT_SHIFT 16U
+
+/* SMBUS Timing config register */
+#define SMB_TIMGCFG_REG 0x4U
+
+#define SMB_TIMGCFG_MODE400_MASK 0x80000000U
+#define SMB_TIMGCFG_MODE400_SHIFT 31U
+
+#define SMB_TIMGCFG_RNDSLVSTR_MASK 0x7F000000U
+#define SMB_TIMGCFG_RNDSLVSTR_SHIFT 24U
+
+#define SMB_TIMGCFG_PERSLVSTR_MASK 0x00FF0000U
+#define SMB_TIMGCFG_PERSLVSTR_SHIFT 16U
+
+#define SMB_TIMGCFG_IDLTIME_MASK 0x0000FF00U
+#define SMB_TIMGCFG_IDLTIME_SHIFT 8U
+
+/* SMBUS Slave address register */
+#define SMB_ADDR_REG 0x8U
+
+#define SMB_EN_NIC_SMBADDR3_MASK 0x80000000U
+#define SMB_EN_NIC_SMBADDR3_SHIFT 31U
+
+#define SMB_NIC_SMBADDR3_MASK 0x7F000000U
+#define SMB_NIC_SMBADDR3_SHIFT 24U
+
+#define SMB_EN_NIC_SMBADDR2_MASK 0x00800000U
+#define SMB_EN_NIC_SMBADDR2_SHIFT 23U
+
+#define SMB_NIC_SMBADDR2_MASK 0x007F0000U
+#define SMB_NIC_SMBADDR2_SHIFT 16U
+
+#define SMB_EN_NIC_SMBADDR1_MASK 0x00008000U
+#define SMB_EN_NIC_SMBADDR1_SHIFT 15U
+
+#define SMB_NIC_SMBADDR1_MASK 0x00007F00U
+#define SMB_NIC_SMBADDR1_SHIFT 8U
+
+#define SMB_EN_NIC_SMBADDR0_MASK 0x00000080U
+#define SMB_EN_NIC_SMBADDR0_SHIFT 7U
+
+#define SMB_NIC_SMBADDR0_MASK 0x0000007FU
+#define SMB_NIC_SMBADDR0_SHIFT 0U
+
+/* SMBUS Master FIFO control register */
+#define SMB_MSTRFIFOCTL_REG 0xCU
+
+#define SMB_MSTRRXFIFOFLSH_MASK 0x80000000U
+#define SMB_MSTRRXFIFOFLSH_SHIFT 31U
+
+#define SMB_MSTRTXFIFOFLSH_MASK 0x40000000U
+#define SMB_MSTRTXFIFOFLSH_SHIFT 30U
+
+#define SMB_MSTRRXPKTCNT_MASK 0x007F0000U
+#define SMB_MSTRRXPKTCNT_SHIFT 16U
+
+#define SMB_MSTRRXFIFOTHR_MASK 0x00003F00U
+#define SMB_MSTRRXFIFOTHR_SHIFT 8U
+
+/* SMBUS Slave FIFO control register */
+#define SMB_SLVFIFOCTL_REG 0x10U
+
+#define SMB_SLVRXFIFOFLSH_MASK 0x80000000U
+#define SMB_SLVRXFIFOFLSH_SHIFT 31U
+
+#define SMB_SLVTXFIFOFLSH_MASK 0x40000000U
+#define SMB_SLVTXFIFOFLSH_SHIFT 30U
+
+#define SMB_SLVRXPKTCNT_MASK 0x007F0000U
+#define SMB_SLVRXPKTCNT_SHIFT 16U
+
+#define SMB_SLVRXFIFOTHR_MASK 0x00003F00U
+#define SMB_SLVRXFIFOTHR_SHIFT 8U
+
+/* SMBUS Bit-bang mode control register */
+#define SMB_BITBANGCTL_REG 0x14U
+
+#define SMB_SMBCLKIN_MASK 0x80000000U
+#define SMB_SMBCLKIN_SHIFT 31U
+
+#define SMB_SMBCLKOUTEN_MASK 0x40000000U
+#define SMB_SMBCLKOUTEN_SHIFT 30U
+
+#define SMB_SMBDATAIN_MASK 0x20000000U
+#define SMB_SMBDATAIN_SHIFT 29U
+
+#define SMB_SMBDATAOUTEN_MASK 0x10000000U
+#define SMB_SMBDATAOUTEN_SHIFT 28U
+
+/* SMBUS Master command register */
+#define SMB_MSTRCMD_REG 0x30U
+
+#define SMB_MSTRSTARTBUSYCMD_MASK 0x80000000U
+#define SMB_MSTRSTARTBUSYCMD_SHIFT 31U
+
+#define SMB_MSTRABORT_MASK 0x40000000U
+#define SMB_MSTRABORT_SHIFT 30U
+
+#define SMB_MSTRSTS_MASK 0x0E000000U
+#define SMB_MSTRSTS_SHIFT 25U
+
+#define SMB_MSTRSMBUSPROTO_MASK 0x00001E00U
+#define SMB_MSTRSMBUSPROTO_SHIFT 9U
+
+#define SMB_MSTRPEC_MASK 0x00000100U
+#define SMB_MSTRPEC_SHIFT 8U
+
+#define SMB_MSTRRDBYTECNT_MASK 0x000000FFU
+#define SMB_MSTRRDBYTECNT_SHIFT 0U
+
+/* SMBUS Slave command register */
+#define SMB_SLVCMD_REG 0x34U
+
+#define SMB_SLVSTARTBUSYCMD_MASK 0x80000000U
+#define SMB_SLVSTARTBUSYCMD_SHIFT 31U
+
+#define SMB_SLVABORT_MASK 0x40000000U
+#define SMB_SLVABORT_SHIFT 30U
+
+#define SMB_SLVSTS_MASK 0x03800000U
+#define SMB_SLVSTS_SHIFT 23U
+
+#define SMB_SLVPEC_MASK 0x00000100U
+#define SMB_SLVPEC_SHIFT 8U
+
+/* SMBUS Event enable register */
+#define SMB_EVTEN_REG 0x38U
+
+#define SMB_MSTRRXFIFOFULLEN_MASK 0x80000000U
+#define SMB_MSTRRXFIFOFULLEN_SHIFT 31U
+
+#define SMB_MSTRRXFIFOTHRHITEN_MASK 0x40000000U
+#define SMB_MSTRRXFIFOTHRHITEN_SHIFT 30U
+
+#define SMB_MSTRRXEVTEN_MASK 0x20000000U
+#define SMB_MSTRRXEVTEN_SHIFT 29U
+
+#define SMB_MSTRSTARTBUSYEN_MASK 0x10000000U
+#define SMB_MSTRSTARTBUSYEN_SHIFT 28U
+
+#define SMB_MSTRTXUNDEN_MASK 0x08000000U
+#define SMB_MSTRTXUNDEN_SHIFT 27U
+
+#define SMB_SLVRXFIFOFULLEN_MASK 0x04000000U
+#define SMB_SLVRXFIFOFULLEN_SHIFT 26U
+
+#define SMB_SLVRXFIFOTHRHITEN_MASK 0x02000000U
+#define SMB_SLVRXFIFOTHRHITEN_SHIFT 25U
+
+#define SMB_SLVRXEVTEN_MASK 0x01000000U
+#define SMB_SLVRXEVTEN_SHIFT 24U
+
+#define SMB_SLVSTARTBUSYEN_MASK 0x00800000U
+#define SMB_SLVSTARTBUSYEN_SHIFT 23U
+
+#define SMB_SLVTXUNDEN_MASK 0x00400000U
+#define SMB_SLVTXUNDEN_SHIFT 22U
+
+#define SMB_SLVRDEVTEN_MASK 0x00200000U
+#define SMB_SLVRDEVTEN_SHIFT 21U
+
+/* SMBUS Event status register */
+#define SMB_EVTSTS_REG 0x3CU
+
+#define SMB_MSTRRXFIFOFULLSTS_MASK 0x80000000U
+#define SMB_MSTRRXFIFOFULLSTS_SHIFT 31U
+
+#define SMB_MSTRRXFIFOTHRHITSTS_MASK 0x40000000U
+#define SMB_MSTRRXFIFOTHRHITSTS_SHIFT 30U
+
+#define SMB_MSTRRXEVTSTS_MASK 0x20000000U
+#define SMB_MSTRRXEVTSTS_SHIFT 29U
+
+#define SMB_MSTRSTARTBUSYSTS_MASK 0x10000000U
+#define SMB_MSTRSTARTBUSYSTS_SHIFT 28U
+
+#define SMB_MSTRTXUNDSTS_MASK 0x08000000U
+#define SMB_MSTRTXUNDSTS_SHIFT 27U
+
+#define SMB_SLVRXFIFOFULLSTS_MASK 0x04000000U
+#define SMB_SLVRXFIFOFULLSTS_SHIFT 26U
+
+#define SMB_SLVRXFIFOTHRHITSTS_MASK 0x02000000U
+#define SMB_SLVRXFIFOTHRHITSTS_SHIFT 25U
+
+#define SMB_SLVRXEVTSTS_MASK 0x01000000U
+#define SMB_SLVRXEVTSTS_SHIFT 24U
+
+#define SMB_SLVSTARTBUSYSTS_MASK 0x00800000U
+#define SMB_SLVSTARTBUSYSTS_SHIFT 23U
+
+#define SMB_SLVTXUNDSTS_MASK 0x00400000U
+#define SMB_SLVTXUNDSTS_SHIFT 22U
+
+#define SMB_SLVRDEVTSTS_MASK 0x00200000U
+#define SMB_SLVRDEVTSTS_SHIFT 21U
+
+/* SMBUS Master data write register */
+#define SMB_MSTRDATAWR_REG 0x40U
+
+#define SMB_MSTRWRSTS_MASK 0x80000000U
+#define SMB_MSTRWRSTS_SHIFT 31U
+
+#define SMB_MSTRWRDATA_MASK 0x000000FFU
+#define SMB_MSTRWRDATA_SHIFT 0U
+
+/* SMBUS Master data read register */
+#define SMB_MSTRDATARD_REG 0x44U
+
+#define SMB_MSTRRDSTS_MASK 0xC0000000U
+#define SMB_MSTRRDSTS_SHIFT 30U
+
+#define SMB_MSTRRDPECERR_MASK 0x20000000U
+#define SMB_MSTRRDPECERR_SHIFT 29U
+
+#define SMB_MSTRRDDATA_MASK 0x000000FFU
+#define SMB_MSTRRDDATA_SHIFT 0U
+
+/* SMBUS Slave data write register */
+#define SMB_SLVDATAWR_REG 0x48U
+
+#define SMB_SLVWRSTS_MASK 0x80000000U
+#define SMB_SLVWRSTS_SHIFT 31U
+
+#define SMB_SLVWRDATA_MASK 0x000000FFU
+#define SMB_SLVWRDATA_SHIFT 0U
+
+/* SMBUS Slave data read register */
+#define SMB_SLVDATARD_REG 0x4CU
+
+#define SMB_SLVRDSTS_MASK 0xC0000000U
+#define SMB_SLVRDSTS_SHIFT 30U
+
+#define SMB_SLVRDERRSTS_MASK 0x30000000U
+#define SMB_SLVRDERRSTS_SHIFT 28U
+
+#define SMB_SLVRDDATA_MASK 0x000000FFU
+#define SMB_SLVRDDATA_SHIFT 0U
+
+#endif /* I2C_REGS */
diff --git a/plat/brcm/board/common/board_common.mk b/plat/brcm/board/common/board_common.mk
index 3069f91..2945749 100644
--- a/plat/brcm/board/common/board_common.mk
+++ b/plat/brcm/board/common/board_common.mk
@@ -1,5 +1,5 @@
#
-# Copyright (c) 2015 - 2020, Broadcom
+# Copyright (c) 2015 - 2021, Broadcom
#
# SPDX-License-Identifier: BSD-3-Clause
#
@@ -36,6 +36,10 @@
DRIVER_SPI_ENABLE := 0
endif
+ifeq (${DRIVER_I2C_ENABLE},)
+DRIVER_I2C_ENABLE := 0
+endif
+
# By default, Trusted Watchdog is always enabled unless SPIN_ON_BL1_EXIT is set
ifeq (${BRCM_DISABLE_TRUSTED_WDOG},)
BRCM_DISABLE_TRUSTED_WDOG := 0
@@ -181,6 +185,12 @@
drivers/brcm/spi_flash.c
endif
+ifeq (${DRIVER_I2C_ENABLE},1)
+$(eval $(call add_define,DRIVER_I2C_ENABLE))
+BL2_SOURCES += drivers/brcm/i2c/i2c.c
+PLAT_INCLUDES += -Iinclude/drivers/brcm/i2c
+endif
+
ifeq (${DRIVER_OCOTP_ENABLE},1)
$(eval $(call add_define,DRIVER_OCOTP_ENABLE))
BL2_SOURCES += drivers/brcm/ocotp.c
