stex: Add S3/S4 support

Add S3/S4 support, add .suspend and .resume function in pci_driver.  In
.suspend handler, driver send S3/S4 signal to the device.

Signed-off-by: Charles Chiou <charles.chiou@tw.promise.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 65 insertions, 3 deletions

diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 19946031fa9a..5b23175a584c 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -167,6 +167,14 @@ enum {
 
         ST_ADDITIONAL_MEM                       = 0x200000,
         ST_ADDITIONAL_MEM_MIN                   = 0x80000,
+        PMIC_SHUTDOWN                           = 0x0D,
+        PMIC_REUMSE                                     = 0x10,
+        ST_IGNORED                                      = -1,
+        ST_NOTHANDLED                           = 7,
+        ST_S3                                           = 3,
+        ST_S4                                           = 4,
+        ST_S5                                           = 5,
+        ST_S6                                           = 6,
 };
 
 struct st_sgitem {
@@ -1718,7 +1726,7 @@ out_disable:
         return err;
 }
 
-static void stex_hba_stop(struct st_hba *hba)
+static void stex_hba_stop(struct st_hba *hba, int st_sleep_mic)
 {
         struct req_msg *req;
         struct st_msg_header *msg_h;
@@ -1727,6 +1735,15 @@ static void stex_hba_stop(struct st_hba *hba)
         u16 tag = 0;
 
         spin_lock_irqsave(hba->host->host_lock, flags);
+
+        if (hba->cardtype == st_yel && hba->supports_pm == 1)
+        {
+                if(st_sleep_mic == ST_NOTHANDLED)
+                {
+                        spin_unlock_irqrestore(hba->host->host_lock, flags);
+                        return;
+                }
+        }
         req = hba->alloc_rq(hba);
         if (hba->cardtype == st_yel) {
                 msg_h = (struct st_msg_header *)req - 1;
@@ -1734,11 +1751,18 @@ static void stex_hba_stop(struct st_hba *hba)
         } else
                 memset(req, 0, hba->rq_size);
 
-        if (hba->cardtype == st_yosemite || hba->cardtype == st_yel) {
+        if ((hba->cardtype == st_yosemite || hba->cardtype == st_yel)
+                && st_sleep_mic == ST_IGNORED) {
                 req->cdb[0] = MGT_CMD;
                 req->cdb[1] = MGT_CMD_SIGNATURE;
                 req->cdb[2] = CTLR_CONFIG_CMD;
                 req->cdb[3] = CTLR_SHUTDOWN;
+        } else if (hba->cardtype == st_yel && st_sleep_mic != ST_IGNORED) {
+                req->cdb[0] = MGT_CMD;
+                req->cdb[1] = MGT_CMD_SIGNATURE;
+                req->cdb[2] = CTLR_CONFIG_CMD;
+                req->cdb[3] = PMIC_SHUTDOWN;
+                req->cdb[4] = st_sleep_mic;
         } else {
                 req->cdb[0] = CONTROLLER_CMD;
                 req->cdb[1] = CTLR_POWER_STATE_CHANGE;
@@ -1758,10 +1782,12 @@ static void stex_hba_stop(struct st_hba *hba)
         while (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE) {
                 if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
                         hba->ccb[tag].req_type = 0;
+                        hba->mu_status = MU_STATE_STOP;
                         return;
                 }
                 msleep(1);
         }
+        hba->mu_status = MU_STATE_STOP;
 }
 
 static void stex_hba_free(struct st_hba *hba)
@@ -1801,9 +1827,43 @@ static void stex_shutdown(struct pci_dev *pdev)
 {
         struct st_hba *hba = pci_get_drvdata(pdev);
 
-        stex_hba_stop(hba);
+        if (hba->supports_pm == 0)
+                stex_hba_stop(hba, ST_IGNORED);
+        else
+                stex_hba_stop(hba, ST_S5);
+}
+
+static int stex_choice_sleep_mic(pm_message_t state)
+{
+        switch (state.event) {
+        case PM_EVENT_SUSPEND:
+                return ST_S3;
+        case PM_EVENT_HIBERNATE:
+                return ST_S4;
+        default:
+                return ST_NOTHANDLED;
+        }
 }
 
+static int stex_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        struct st_hba *hba = pci_get_drvdata(pdev);
+
+        if (hba->cardtype == st_yel && hba->supports_pm == 1)
+                stex_hba_stop(hba, stex_choice_sleep_mic(state));
+        else
+                stex_hba_stop(hba, ST_IGNORED);
+        return 0;
+}
+
+static int stex_resume(struct pci_dev *pdev)
+{
+        struct st_hba *hba = pci_get_drvdata(pdev);
+
+        hba->mu_status = MU_STATE_STARTING;
+        stex_handshake(hba);
+        return 0;
+}
 MODULE_DEVICE_TABLE(pci, stex_pci_tbl);
 
 static struct pci_driver stex_pci_driver = {
@@ -1812,6 +1872,8 @@ static struct pci_driver stex_pci_driver = {
         .probe          = stex_probe,
         .remove         = stex_remove,
         .shutdown       = stex_shutdown,
+        .suspend        = stex_suspend,
+        .resume         = stex_resume,
 };
 
 static int __init stex_init(void)