+#define PHY848xx_CMDHDLR_WAIT 300
+#define PHY848xx_CMDHDLR_MAX_ARGS 5
+
+static int bnx2x_84858_cmd_hdlr(struct bnx2x_phy *phy,
+ struct link_params *params,
+ u16 fw_cmd,
+ u16 cmd_args[], int argc)
+{
+ int idx;
+ u16 val;
+ struct bnx2x *bp = params->bp;
+
+ /* Step 1: Poll the STATUS register to see whether the previous command
+ * is in progress or the system is busy (CMD_IN_PROGRESS or
+ * SYSTEM_BUSY). If previous command is in progress or system is busy,
+ * check again until the previous command finishes execution and the
+ * system is available for taking command
+ */
+
+ for (idx = 0; idx < PHY848xx_CMDHDLR_WAIT; idx++) {
+ bnx2x_cl45_read(bp, phy, MDIO_CTL_DEVAD,
+ MDIO_848xx_CMD_HDLR_STATUS, &val);
+ if ((val != PHY84858_STATUS_CMD_IN_PROGRESS) &&
+ (val != PHY84858_STATUS_CMD_SYSTEM_BUSY))
+ break;
+ usleep_range(1000, 2000);
+ }
+ if (idx >= PHY848xx_CMDHDLR_WAIT) {
+ DP(NETIF_MSG_LINK, "FW cmd: FW not ready.\n");
+ return -EINVAL;
+ }
+
+ /* Step2: If any parameters are required for the function, write them
+ * to the required DATA registers
+ */
+
+ for (idx = 0; idx < argc; idx++) {
+ bnx2x_cl45_write(bp, phy, MDIO_CTL_DEVAD,
+ MDIO_848xx_CMD_HDLR_DATA1 + idx,
+ cmd_args[idx]);
+ }
+
+ /* Step3: When the firmware is ready for commands, write the 'Command
+ * code' to the CMD register
+ */
+ bnx2x_cl45_write(bp, phy, MDIO_CTL_DEVAD,
+ MDIO_848xx_CMD_HDLR_COMMAND, fw_cmd);
+
+ /* Step4: Once the command has been written, poll the STATUS register
+ * to check whether the command has completed (CMD_COMPLETED_PASS/
+ * CMD_FOR_CMDS or CMD_COMPLETED_ERROR).
+ */
+
+ for (idx = 0; idx < PHY848xx_CMDHDLR_WAIT; idx++) {
+ bnx2x_cl45_read(bp, phy, MDIO_CTL_DEVAD,
+ MDIO_848xx_CMD_HDLR_STATUS, &val);
+ if ((val == PHY84858_STATUS_CMD_COMPLETE_PASS) ||
+ (val == PHY84858_STATUS_CMD_COMPLETE_ERROR))
+ break;
+ usleep_range(1000, 2000);
+ }
+ if ((idx >= PHY848xx_CMDHDLR_WAIT) ||
+ (val == PHY84858_STATUS_CMD_COMPLETE_ERROR)) {
+ DP(NETIF_MSG_LINK, "FW cmd failed.\n");
+ return -EINVAL;
+ }
+ /* Step5: Once the command has completed, read the specficied DATA
+ * registers for any saved results for the command, if applicable
+ */
+
+ /* Gather returning data */
+ for (idx = 0; idx < argc; idx++) {
+ bnx2x_cl45_read(bp, phy, MDIO_CTL_DEVAD,
+ MDIO_848xx_CMD_HDLR_DATA1 + idx,
+ &cmd_args[idx]);
+ }
+
+ return 0;
+}
+