qlge: Add support for firmware mailbox commands.

This interface will be used for setting things like maximum
frame size, setting WOL, and ACKing changes requested by the FCOE
function.
Signed-off-by: Ron Mercer <ron.mercer@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/qlge/qlge_mpi.c

 #include "qlge.h"
 
+static void ql_display_mb_sts(struct ql_adapter *qdev,
+						struct mbox_params *mbcp)
+{
+	int i;
+	static char *err_sts[] = {
+		"Command Complete",
+		"Command Not Supported",
+		"Host Interface Error",
+		"Checksum Error",
+		"Unused Completion Status",
+		"Test Failed",
+		"Command Parameter Error"};
+
+	QPRINTK(qdev, DRV, DEBUG, "%s.\n",
+		err_sts[mbcp->mbox_out[0] & 0x0000000f]);
+	for (i = 0; i < mbcp->out_count; i++)
+		QPRINTK(qdev, DRV, DEBUG, "mbox_out[%d] = 0x%.08x.\n",
+				i, mbcp->mbox_out[i]);
+}
+
 int ql_read_mpi_reg(struct ql_adapter *qdev, u32 reg, u32 *data)
 {
 	int status;
@@ -65,6 +85,59 @@ static int ql_get_mb_sts(struct ql_adapter *qdev, struct mbox_params *mbcp)
 	return status;
 }
 
+/* Wait for a single mailbox command to complete.
+ * Returns zero on success.
+ */
+static int ql_wait_mbx_cmd_cmplt(struct ql_adapter *qdev)
+{
+	int count = 50;	/* TODO: arbitrary for now. */
+	u32 value;
+
+	do {
+		value = ql_read32(qdev, STS);
+		if (value & STS_PI)
+			return 0;
+		udelay(UDELAY_DELAY); /* 10us */
+	} while (--count);
+	return -ETIMEDOUT;
+}
+
+/* Execute a single mailbox command.
+ * Caller must hold PROC_ADDR semaphore.
+ */
+static int ql_exec_mb_cmd(struct ql_adapter *qdev, struct mbox_params *mbcp)
+{
+	int i, status;
+
+	/*
+	 * Make sure there's nothing pending.
+	 * This shouldn't happen.
+	 */
+	if (ql_read32(qdev, CSR) & CSR_HRI)
+		return -EIO;
+
+	status = ql_sem_spinlock(qdev, SEM_PROC_REG_MASK);
+	if (status)
+		return status;
+
+	/*
+	 * Fill the outbound mailboxes.
+	 */
+	for (i = 0; i < mbcp->in_count; i++) {
+		status = ql_write_mpi_reg(qdev, qdev->mailbox_in + i,
+						mbcp->mbox_in[i]);
+		if (status)
+			goto end;
+	}
+	/*
+	 * Wake up the MPI firmware.
+	 */
+	ql_write32(qdev, CSR, CSR_CMD_SET_H2R_INT);
+end:
+	ql_sem_unlock(qdev, SEM_PROC_REG_MASK);
+	return status;
+}
+
 static void ql_link_up(struct ql_adapter *qdev, struct mbox_params *mbcp)
 {
 	mbcp->out_count = 2;
@@ -133,6 +206,7 @@ exit:
 static int ql_mpi_handler(struct ql_adapter *qdev, struct mbox_params *mbcp)
 {
 	int status;
+	int orig_count = mbcp->out_count;
 
 	/* Just get mailbox zero for now. */
 	mbcp->out_count = 1;
@@ -146,6 +220,27 @@ static int ql_mpi_handler(struct ql_adapter *qdev, struct mbox_params *mbcp)
 
 	switch (mbcp->mbox_out[0]) {
 
+	/* This case is only active when we arrive here
+	 * as a result of issuing a mailbox command to
+	 * the firmware.
+	 */
+	case MB_CMD_STS_INTRMDT:
+	case MB_CMD_STS_GOOD:
+	case MB_CMD_STS_INVLD_CMD:
+	case MB_CMD_STS_XFC_ERR:
+	case MB_CMD_STS_CSUM_ERR:
+	case MB_CMD_STS_ERR:
+	case MB_CMD_STS_PARAM_ERR:
+		/* We can only get mailbox status if we're polling from an
+		 * unfinished command.  Get the rest of the status data and
+		 * return back to the caller.
+		 * We only end up here when we're polling for a mailbox
+		 * command completion.
+		 */
+		mbcp->out_count = orig_count;
+		status = ql_get_mb_sts(qdev, mbcp);
+		return status;
+
 	case AEN_LINK_UP:
 		ql_link_up(qdev, mbcp);
 		break;
@@ -158,12 +253,8 @@ static int ql_mpi_handler(struct ql_adapter *qdev, struct mbox_params *mbcp)
 		ql_init_fw_done(qdev, mbcp);
 		break;
 
-	case MB_CMD_STS_GOOD:
-		break;
-
 	case AEN_FW_INIT_FAIL:
 	case AEN_SYS_ERR:
-	case MB_CMD_STS_ERR:
 		ql_queue_fw_error(qdev);
 		break;
 
@@ -177,6 +268,129 @@ end:
 	return status;
 }
 
+/* Execute a single mailbox command.
+ * mbcp is a pointer to an array of u32.  Each
+ * element in the array contains the value for it's
+ * respective mailbox register.
+ */
+static int ql_mailbox_command(struct ql_adapter *qdev, struct mbox_params *mbcp)
+{
+	int status, count;
+
+	mutex_lock(&qdev->mpi_mutex);
+
+	/* Begin polled mode for MPI */
+	ql_write32(qdev, INTR_MASK, (INTR_MASK_PI << 16));
+
+	/* Load the mailbox registers and wake up MPI RISC. */
+	status = ql_exec_mb_cmd(qdev, mbcp);
+	if (status)
+		goto end;
+
+
+	/* If we're generating a system error, then there's nothing
+	 * to wait for.
+	 */
+	if (mbcp->mbox_in[0] == MB_CMD_MAKE_SYS_ERR)
+		goto end;
+
+	/* Wait for the command to complete. We loop
+	 * here because some AEN might arrive while
+	 * we're waiting for the mailbox command to
+	 * complete. If more than 5 arrive then we can
+	 * assume something is wrong. */
+	count = 5;
+	do {
+		/* Wait for the interrupt to come in. */
+		status = ql_wait_mbx_cmd_cmplt(qdev);
+		if (status)
+			goto end;
+
+		/* Process the event.  If it's an AEN, it
+		 * will be handled in-line or a worker
+		 * will be spawned. If it's our completion
+		 * we will catch it below.
+		 */
+		status = ql_mpi_handler(qdev, mbcp);
+		if (status)
+			goto end;
+
+		/* It's either the completion for our mailbox
+		 * command complete or an AEN.  If it's our
+		 * completion then get out.
+		 */
+		if (((mbcp->mbox_out[0] & 0x0000f000) ==
+					MB_CMD_STS_GOOD) ||
+			((mbcp->mbox_out[0] & 0x0000f000) ==
+					MB_CMD_STS_INTRMDT))
+			break;
+	} while (--count);
+
+	if (!count) {
+		QPRINTK(qdev, DRV, ERR,
+			"Timed out waiting for mailbox complete.\n");
+		status = -ETIMEDOUT;
+		goto end;
+	}
+
+	/* Now we can clear the interrupt condition
+	 * and look at our status.
+	 */
+	ql_write32(qdev, CSR, CSR_CMD_CLR_R2PCI_INT);
+
+	if (((mbcp->mbox_out[0] & 0x0000f000) !=
+					MB_CMD_STS_GOOD) &&
+		((mbcp->mbox_out[0] & 0x0000f000) !=
+					MB_CMD_STS_INTRMDT)) {
+		ql_display_mb_sts(qdev, mbcp);
+		status = -EIO;
+	}
+end:
+	mutex_unlock(&qdev->mpi_mutex);
+	/* End polled mode for MPI */
+	ql_write32(qdev, INTR_MASK, (INTR_MASK_PI << 16) | INTR_MASK_PI);
+	return status;
+}
+
+/* Get functional state for MPI firmware.
+ * Returns zero on success.
+ */
+int ql_mb_get_fw_state(struct ql_adapter *qdev)
+{
+	struct mbox_params mbc;
+	struct mbox_params *mbcp = &mbc;
+	int status = 0;
+
+	memset(mbcp, 0, sizeof(struct mbox_params));
+
+	mbcp->in_count = 1;
+	mbcp->out_count = 2;
+
+	mbcp->mbox_in[0] = MB_CMD_GET_FW_STATE;
+
+	status = ql_mailbox_command(qdev, mbcp);
+	if (status)
+		return status;
+
+	if (mbcp->mbox_out[0] != MB_CMD_STS_GOOD) {
+		QPRINTK(qdev, DRV, ERR,
+			"Failed Get Firmware State.\n");
+		status = -EIO;
+	}
+
+	/* If bit zero is set in mbx 1 then the firmware is
+	 * running, but not initialized.  This should never
+	 * happen.
+	 */
+	if (mbcp->mbox_out[1] & 1) {
+		QPRINTK(qdev, DRV, ERR,
+			"Firmware waiting for initialization.\n");
+		status = -EIO;
+	}
+
+	return status;
+}
+
 void ql_mpi_work(struct work_struct *work)
 {
 	struct ql_adapter *qdev =