linux-kernel - [PATCH 5/9] scsi: hisi_sas: relocate some common code for v3 hw

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Message-ID: <1531923273-193768-6-git-send-email-john.garry@huawei.com>
Date:   Wed, 18 Jul 2018 22:14:29 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>,
        Xiaofei Tan <tanxiaofei@...wei.com>,
        "John Garry" <john.garry@...wei.com>
Subject: [PATCH 5/9] scsi: hisi_sas: relocate some common code for v3 hw

From: Xiaofei Tan <tanxiaofei@...wei.com>

Much code of PM suspend function also exists in soft reset function. This
is not concise. So, this patch relocates the common code of these two
functions to a separate function.

Signed-off-by: Xiaofei Tan <tanxiaofei@...wei.com>
Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 50 ++++++++++++++++++----------------
 1 file changed, 27 insertions(+), 23 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 70a6aa2..3577843 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -210,6 +210,8 @@
 
 #define AXI_MASTER_CFG_BASE		(0x5000)
 #define AM_CTRL_GLOBAL			(0x0)
+#define AM_CTRL_SHUTDOWN_REQ_OFF	0
+#define AM_CTRL_SHUTDOWN_REQ_MSK	(0x1 << AM_CTRL_SHUTDOWN_REQ_OFF)
 #define AM_CURR_TRANS_RETURN	(0x150)
 
 #define AM_CFG_MAX_TRANS		(0x5010)
@@ -1976,11 +1978,11 @@ static void phy_get_events_v3_hw(struct hisi_hba *hisi_hba, int phy_no)
 
 }
 
-static int soft_reset_v3_hw(struct hisi_hba *hisi_hba)
+static int disable_host_v3_hw(struct hisi_hba *hisi_hba)
 {
 	struct device *dev = hisi_hba->dev;
+	u32 status, reg_val;
 	int rc;
-	u32 status;
 
 	interrupt_disable_v3_hw(hisi_hba);
 	hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE, 0x0);
@@ -1990,14 +1992,32 @@ static int soft_reset_v3_hw(struct hisi_hba *hisi_hba)
 
 	mdelay(10);
 
-	hisi_sas_write32(hisi_hba, AXI_MASTER_CFG_BASE + AM_CTRL_GLOBAL, 0x1);
+	reg_val = hisi_sas_read32(hisi_hba, AXI_MASTER_CFG_BASE +
+				  AM_CTRL_GLOBAL);
+	reg_val |= AM_CTRL_SHUTDOWN_REQ_MSK;
+	hisi_sas_write32(hisi_hba, AXI_MASTER_CFG_BASE +
+			 AM_CTRL_GLOBAL, reg_val);
 
 	/* wait until bus idle */
 	rc = hisi_sas_read32_poll_timeout(AXI_MASTER_CFG_BASE +
 					  AM_CURR_TRANS_RETURN, status,
 					  status == 0x3, 10, 100);
 	if (rc) {
-		dev_err(dev, "axi bus is not idle, rc = %d\n", rc);
+		dev_err(dev, "axi bus is not idle, rc=%d\n", rc);
+		return rc;
+	}
+
+	return 0;
+}
+
+static int soft_reset_v3_hw(struct hisi_hba *hisi_hba)
+{
+	struct device *dev = hisi_hba->dev;
+	int rc;
+
+	rc = disable_host_v3_hw(hisi_hba);
+	if (rc) {
+		dev_err(dev, "soft reset: disable host failed rc=%d\n", rc);
 		return rc;
 	}
 
@@ -2456,9 +2476,8 @@ static int hisi_sas_v3_suspend(struct pci_dev *pdev, pm_message_t state)
 	struct hisi_hba *hisi_hba = sha->lldd_ha;
 	struct device *dev = hisi_hba->dev;
 	struct Scsi_Host *shost = hisi_hba->shost;
-	u32 device_state, status;
+	u32 device_state;
 	int rc;
-	u32 reg_val;
 
 	if (!pdev->pm_cap) {
 		dev_err(dev, "PCI PM not supported\n");
@@ -2471,25 +2490,10 @@ static int hisi_sas_v3_suspend(struct pci_dev *pdev, pm_message_t state)
 	scsi_block_requests(shost);
 	set_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
 	flush_workqueue(hisi_hba->wq);
-	/* disable DQ/PHY/bus */
-	interrupt_disable_v3_hw(hisi_hba);
-	hisi_sas_write32(hisi_hba, DLVRY_QUEUE_ENABLE, 0x0);
-	hisi_sas_kill_tasklets(hisi_hba);
 
-	hisi_sas_stop_phys(hisi_hba);
-
-	reg_val = hisi_sas_read32(hisi_hba, AXI_MASTER_CFG_BASE +
-		AM_CTRL_GLOBAL);
-	reg_val |= 0x1;
-	hisi_sas_write32(hisi_hba, AXI_MASTER_CFG_BASE +
-		AM_CTRL_GLOBAL, reg_val);
-
-	/* wait until bus idle */
-	rc = hisi_sas_read32_poll_timeout(AXI_MASTER_CFG_BASE +
-					  AM_CURR_TRANS_RETURN, status,
-					  status == 0x3, 10, 100);
+	rc = disable_host_v3_hw(hisi_hba);
 	if (rc) {
-		dev_err(dev, "axi bus is not idle, rc = %d\n", rc);
+		dev_err(dev, "PM suspend: disable host failed rc=%d\n", rc);
 		clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
 		clear_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags);
 		scsi_unblock_requests(shost);
-- 
1.9.1