ata: ceva: Move sata port phy oob settings to device-tree

In SATA Speed negotiation happens with  OOB(Out of Band) signals. These OOB
signal timing values are configured through vendor specific registers in the
SATA controller. These OOB timings depends on the generator and detector clock
frequency, which varies from board to board (ex: ep108 and zc1751 has different
clock frequencies).
To avoid maintaing these OOB settings in the driver, it is better to move these
settings to the device-tree node and read from the device-tree.

This patch does the same.
Signed-off-by: Anurag Kumar Vulisha <anuragku@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/ata/ahci_ceva.c

@@ -50,21 +50,6 @@
 #define PPCFG_PSS_EN	(1 << 29)
 #define PPCFG_ESDF_EN	(1 << 31)
 
-#define PP2C_CIBGMN	0x0F
-#define PP2C_CIBGMX	(0x25 << 8)
-#define PP2C_CIBGN	(0x18 << 16)
-#define PP2C_CINMP	(0x29 << 24)
-
-#define PP3C_CWBGMN	0x04
-#define PP3C_CWBGMX	(0x0B << 8)
-#define PP3C_CWBGN	(0x08 << 16)
-#define PP3C_CWNMP	(0x0F << 24)
-
-#define PP4C_BMX	0x0a
-#define PP4C_BNM	(0x08 << 8)
-#define PP4C_SFD	(0x4a << 16)
-#define PP4C_PTST	(0x06 << 24)
-
 #define PP5C_RIT	0x60216
 #define PP5C_RCT	(0x7f0 << 20)
 
@@ -87,6 +72,11 @@
 
 struct ceva_ahci_priv {
 	struct platform_device *ahci_pdev;
+	/* Port Phy2Cfg Register */
+	u32 pp2c[NR_PORTS];
+	u32 pp3c[NR_PORTS];
+	u32 pp4c[NR_PORTS];
+	u32 pp5c[NR_PORTS];
 	int flags;
 };
 
@@ -131,20 +121,16 @@ static void ahci_ceva_setup(struct ahci_host_priv *hpriv)
 		writel(tmp, mmio + AHCI_VEND_PPCFG);
 
 		/* Phy Control OOB timing parameters COMINIT */
-		tmp = PP2C_CIBGMN | PP2C_CIBGMX | PP2C_CIBGN | PP2C_CINMP;
-		writel(tmp, mmio + AHCI_VEND_PP2C);
+		writel(cevapriv->pp2c[i], mmio + AHCI_VEND_PP2C);
 
 		/* Phy Control OOB timing parameters COMWAKE */
-		tmp = PP3C_CWBGMN | PP3C_CWBGMX | PP3C_CWBGN | PP3C_CWNMP;
-		writel(tmp, mmio + AHCI_VEND_PP3C);
+		writel(cevapriv->pp3c[i], mmio + AHCI_VEND_PP3C);
 
 		/* Phy Control Burst timing setting */
-		tmp = PP4C_BMX | PP4C_BNM | PP4C_SFD | PP4C_PTST;
-		writel(tmp, mmio + AHCI_VEND_PP4C);
+		writel(cevapriv->pp4c[i], mmio + AHCI_VEND_PP4C);
 
 		/* Rate Change Timer and Retry Interval Timer setting */
-		tmp = PP5C_RIT | PP5C_RCT;
-		writel(tmp, mmio + AHCI_VEND_PP5C);
+		writel(cevapriv->pp5c[i], mmio + AHCI_VEND_PP5C);
 
 		/* Rx Watermark setting  */
 		tmp = PTC_RX_WM_VAL | PTC_RSVD;
@@ -187,6 +173,58 @@ static int ceva_ahci_probe(struct platform_device *pdev)
 	if (of_property_read_bool(np, "ceva,broken-gen2"))
 		cevapriv->flags = CEVA_FLAG_BROKEN_GEN2;
 
+	/* Read OOB timing value for COMINIT from device-tree */
+	if (of_property_read_u8_array(np, "ceva,p0-cominit-params",
+					(u8 *)&cevapriv->pp2c[0], 4) < 0) {
+		dev_warn(dev, "ceva,p0-cominit-params property not defined\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u8_array(np, "ceva,p1-cominit-params",
+					(u8 *)&cevapriv->pp2c[1], 4) < 0) {
+		dev_warn(dev, "ceva,p1-cominit-params property not defined\n");
+		return -EINVAL;
+	}
+
+	/* Read OOB timing value for COMWAKE from device-tree*/
+	if (of_property_read_u8_array(np, "ceva,p0-comwake-params",
+					(u8 *)&cevapriv->pp3c[0], 4) < 0) {
+		dev_warn(dev, "ceva,p0-comwake-params property not defined\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u8_array(np, "ceva,p1-comwake-params",
+					(u8 *)&cevapriv->pp3c[1], 4) < 0) {
+		dev_warn(dev, "ceva,p1-comwake-params property not defined\n");
+		return -EINVAL;
+	}
+
+	/* Read phy BURST timing value from device-tree */
+	if (of_property_read_u8_array(np, "ceva,p0-burst-params",
+					(u8 *)&cevapriv->pp4c[0], 4) < 0) {
+		dev_warn(dev, "ceva,p0-burst-params property not defined\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u8_array(np, "ceva,p1-burst-params",
+					(u8 *)&cevapriv->pp4c[1], 4) < 0) {
+		dev_warn(dev, "ceva,p1-burst-params property not defined\n");
+		return -EINVAL;
+	}
+
+	/* Read phy RETRY interval timing value from device-tree */
+	if (of_property_read_u16_array(np, "ceva,p0-retry-params",
+					(u16 *)&cevapriv->pp5c[0], 2) < 0) {
+		dev_warn(dev, "ceva,p0-retry-params property not defined\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u16_array(np, "ceva,p1-retry-params",
+					(u16 *)&cevapriv->pp5c[1], 2) < 0) {
+		dev_warn(dev, "ceva,p1-retry-params property not defined\n");
+		return -EINVAL;
+	}
+
 	hpriv->plat_data = cevapriv;
 
 	/* CEVA specific initialization */