1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/edp/edp_phy.c b/drivers/gpu/drm/msm/edp/edp_phy.c
new file mode 100644
index 000000000000..36bb8933e9ee
--- /dev/null
+++ b/drivers/gpu/drm/msm/edp/edp_phy.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "edp.h"
+#include "edp.xml.h"
+
+#define EDP_MAX_LANE	4
+
+struct edp_phy {
+	void __iomem *base;
+};
+
+bool msm_edp_phy_ready(struct edp_phy *phy)
+{
+	u32 status;
+	int cnt = 100;
+
+	while (--cnt) {
+		status = edp_read(phy->base +
+				REG_EDP_PHY_GLB_PHY_STATUS);
+		if (status & 0x01)
+			break;
+		usleep_range(500, 1000);
+	}
+
+	if (cnt == 0) {
+		pr_err("%s: PHY NOT ready\n", __func__);
+		return false;
+	} else {
+		return true;
+	}
+}
+
+void msm_edp_phy_ctrl(struct edp_phy *phy, int enable)
+{
+	DBG("enable=%d", enable);
+	if (enable) {
+		/* Reset */
+		edp_write(phy->base + REG_EDP_PHY_CTRL,
+			EDP_PHY_CTRL_SW_RESET | EDP_PHY_CTRL_SW_RESET_PLL);
+		/* Make sure fully reset */
+		wmb();
+		usleep_range(500, 1000);
+		edp_write(phy->base + REG_EDP_PHY_CTRL, 0x000);
+		edp_write(phy->base + REG_EDP_PHY_GLB_PD_CTL, 0x3f);
+		edp_write(phy->base + REG_EDP_PHY_GLB_CFG, 0x1);
+	} else {
+		edp_write(phy->base + REG_EDP_PHY_GLB_PD_CTL, 0xc0);
+	}
+}
+
+/* voltage mode and pre emphasis cfg */
+void msm_edp_phy_vm_pe_init(struct edp_phy *phy)
+{
+	edp_write(phy->base + REG_EDP_PHY_GLB_VM_CFG0, 0x3);
+	edp_write(phy->base + REG_EDP_PHY_GLB_VM_CFG1, 0x64);
+	edp_write(phy->base + REG_EDP_PHY_GLB_MISC9, 0x6c);
+}
+
+void msm_edp_phy_vm_pe_cfg(struct edp_phy *phy, u32 v0, u32 v1)
+{
+	edp_write(phy->base + REG_EDP_PHY_GLB_VM_CFG0, v0);
+	edp_write(phy->base + REG_EDP_PHY_GLB_VM_CFG1, v1);
+}
+
+void msm_edp_phy_lane_power_ctrl(struct edp_phy *phy, bool up, u32 max_lane)
+{
+	u32 i;
+	u32 data;
+
+	if (up)
+		data = 0;	/* power up */
+	else
+		data = 0x7;	/* power down */
+
+	for (i = 0; i < max_lane; i++)
+		edp_write(phy->base + REG_EDP_PHY_LN_PD_CTL(i) , data);
+
+	/* power down unused lane */
+	data = 0x7;	/* power down */
+	for (i = max_lane; i < EDP_MAX_LANE; i++)
+		edp_write(phy->base + REG_EDP_PHY_LN_PD_CTL(i) , data);
+}
+
+void *msm_edp_phy_init(struct device *dev, void __iomem *regbase)
+{
+	struct edp_phy *phy = NULL;
+
+	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy)
+		return NULL;
+
+	phy->base = regbase;
+	return phy;
+}
+