+/*
+* qla82xx_need_qsnt_handler
+* Code to start quiescence sequence
+*
+* Note:
+* IDC lock must be held upon entry
+*
+* Return: void
+*/
+
+static void
+qla82xx_need_qsnt_handler(scsi_qla_host_t *vha)
+{
+ struct qla_hw_data *ha = vha->hw;
+ uint32_t dev_state, drv_state, drv_active;
+ unsigned long reset_timeout;
+
+ if (vha->flags.online) {
+ /*Block any further I/O and wait for pending cmnds to complete*/
+ qla82xx_quiescent_state_cleanup(vha);
+ }
+
+ /* Set the quiescence ready bit */
+ qla82xx_set_qsnt_ready(ha);
+
+ /*wait for 30 secs for other functions to ack */
+ reset_timeout = jiffies + (30 * HZ);
+
+ drv_state = qla82xx_rd_32(ha, QLA82XX_CRB_DRV_STATE);
+ drv_active = qla82xx_rd_32(ha, QLA82XX_CRB_DRV_ACTIVE);
+ /* Its 2 that is written when qsnt is acked, moving one bit */
+ drv_active = drv_active << 0x01;
+
+ while (drv_state != drv_active) {
+
+ if (time_after_eq(jiffies, reset_timeout)) {
+ /* quiescence timeout, other functions didn't ack
+ * changing the state to DEV_READY
+ */
+ qla_printk(KERN_INFO, ha,
+ "%s: QUIESCENT TIMEOUT\n", QLA2XXX_DRIVER_NAME);
+ qla_printk(KERN_INFO, ha,
+ "DRV_ACTIVE:%d DRV_STATE:%d\n", drv_active,
+ drv_state);
+ qla82xx_wr_32(ha, QLA82XX_CRB_DEV_STATE,
+ QLA82XX_DEV_READY);
+ qla_printk(KERN_INFO, ha,
+ "HW State: DEV_READY\n");
+ qla82xx_idc_unlock(ha);
+ qla2x00_perform_loop_resync(vha);
+ qla82xx_idc_lock(ha);
+
+ qla82xx_clear_qsnt_ready(vha);
+ return;
+ }
+
+ qla82xx_idc_unlock(ha);
+ msleep(1000);
+ qla82xx_idc_lock(ha);
+
+ drv_state = qla82xx_rd_32(ha, QLA82XX_CRB_DRV_STATE);
+ drv_active = qla82xx_rd_32(ha, QLA82XX_CRB_DRV_ACTIVE);
+ drv_active = drv_active << 0x01;
+ }
+ dev_state = qla82xx_rd_32(ha, QLA82XX_CRB_DEV_STATE);
+ /* everyone acked so set the state to DEV_QUIESCENCE */
+ if (dev_state == QLA82XX_DEV_NEED_QUIESCENT) {
+ qla_printk(KERN_INFO, ha, "HW State: DEV_QUIESCENT\n");
+ qla82xx_wr_32(ha, QLA82XX_CRB_DEV_STATE, QLA82XX_DEV_QUIESCENT);
+ }
+}
+
+/*
+* qla82xx_wait_for_state_change
+* Wait for device state to change from given current state
+*
+* Note:
+* IDC lock must not be held upon entry
+*
+* Return:
+* Changed device state.
+*/
+uint32_t
+qla82xx_wait_for_state_change(scsi_qla_host_t *vha, uint32_t curr_state)
+{
+ struct qla_hw_data *ha = vha->hw;
+ uint32_t dev_state;
+
+ do {
+ msleep(1000);
+ qla82xx_idc_lock(ha);
+ dev_state = qla82xx_rd_32(ha, QLA82XX_CRB_DEV_STATE);
+ qla82xx_idc_unlock(ha);
+ } while (dev_state == curr_state);
+
+ return dev_state;
+}
+