[PATCH 2/7] PCI: rockchip: introduce per-lanes PHYs support

[Shawn Lin <shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org>]

We distinguish the legacy PHY with the newer per-lane
PHYs by adding legacy_phy flag and consolidate all
the phy operations into a single function to simply the
code. Note that the legacy phy is still the first option
to be searched in order not to break the backward compatibility
of DT blob, althoug we use devm_phy_optional_get instead which
seams to violate the original statement of pcie-rockchip's DT
document.

Signed-off-by: Shawn Lin <shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---

 drivers/pci/host/pcie-rockchip.c | 144 ++++++++++++++++++++++++++++++++-------
 1 file changed, 118 insertions(+), 26 deletions(-)

diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index 6632a51..f755df5 100644
--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -47,6 +47,7 @@
 #define HIWORD_UPDATE_BIT(val)		HIWORD_UPDATE(val, val)
 
 #define ENCODE_LANES(x)			((((x) >> 1) & 3) << 4)
+#define MAX_LANE_NUM			4
 
 #define PCIE_CLIENT_BASE		0x0
 #define PCIE_CLIENT_CONFIG		(PCIE_CLIENT_BASE + 0x00)
@@ -210,7 +211,9 @@
 struct rockchip_pcie {
 	void	__iomem *reg_base;		/* DT axi-base */
 	void	__iomem *apb_base;		/* DT apb-base */
+	bool	legacy_phy;
 	struct	phy *phy;
+	struct  phy **phys;
 	struct	reset_control *core_rst;
 	struct	reset_control *mgmt_rst;
 	struct	reset_control *mgmt_sticky_rst;
@@ -242,6 +245,15 @@ struct rockchip_pcie {
 	phys_addr_t mem_bus_addr;
 };
 
+enum phy_ops_type {
+	PHY_INIT,
+	PHY_PWR_ON,
+	PHY_PWR_OFF,
+	PHY_EXIT,
+};
+
+const char *phy_ops_name[] = {"init", "power on", "power off", "exit"};
+
 static u32 rockchip_pcie_read(struct rockchip_pcie *rockchip, u32 reg)
 {
 	return readl(rockchip->apb_base + reg);
@@ -507,6 +519,104 @@ static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
 	rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR);
 }
 
+static int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip)
+{
+	struct device *dev = rockchip->dev;
+	struct phy *phy;
+	char *name;
+	u32 i;
+
+	rockchip->phy = devm_phy_get(dev, "pcie-phy");
+	if (IS_ERR(rockchip->phy)) {
+		if (PTR_ERR(rockchip->phy) == -EPROBE_DEFER)
+			return PTR_ERR(rockchip->phy);
+		dev_dbg(dev, "missing legacy phy, and search for per-lane PHY\n");
+	} else {
+		rockchip->legacy_phy = true;
+		dev_warn(dev, "legacy phy model is deprecated!\n");
+		return 0;
+	}
+
+	/* per-lane PHYs */
+	rockchip->phys = devm_kcalloc(dev, sizeof(phy), MAX_LANE_NUM,
+				      GFP_KERNEL);
+	if (!rockchip->phys)
+		return -ENOMEM;
+
+	for (i = 0; i < MAX_LANE_NUM; i++) {
+		name = kasprintf(GFP_KERNEL, "%s-%u", "pcie-phy", i);
+		if (!name)
+			return -ENOMEM;
+
+		phy = devm_of_phy_get(rockchip->dev,
+				      rockchip->dev->of_node, name);
+		kfree(name);
+
+		if (IS_ERR(phy)) {
+			if (PTR_ERR(phy) != -EPROBE_DEFER)
+				dev_err(dev, "missing phy for lane %d: %ld\n",
+					i, PTR_ERR(phy));
+			return PTR_ERR(phy);
+		}
+
+		rockchip->phys[i] = phy;
+	}
+
+	return 0;
+}
+
+static int rockchip_pcie_manipulate_phys(struct rockchip_pcie *rockchip,
+					 enum phy_ops_type type)
+{
+	int i, phy_num, err;
+	struct device *dev = rockchip->dev;
+	struct phy *phy;
+
+	phy_num = rockchip->legacy_phy ? 1 : MAX_LANE_NUM;
+
+	for (i = 0; i < phy_num; i++) {
+		phy = rockchip->legacy_phy ? rockchip->phy :
+					     rockchip->phys[i];
+		switch (type) {
+		case PHY_INIT:
+			if (phy->init_count > phy_num)
+				continue;
+			err = phy_init(phy);
+			break;
+		case PHY_PWR_ON:
+			if (phy->power_count > phy_num)
+				continue;
+			err = phy_power_on(phy);
+			break;
+		case PHY_PWR_OFF:
+			if (!phy->power_count)
+				continue;
+			err = phy_power_off(phy);
+			break;
+		case PHY_EXIT:
+			if (!phy->init_count)
+				continue;
+			err = phy_exit(phy);
+			break;
+		default:
+			dev_err(dev, "unsupported phy_ops_type\n");
+			return -EOPNOTSUPP;
+		}
+
+		if (err < 0) {
+			if (rockchip->legacy_phy)
+				dev_err(dev, "fail to %s legacy PHY, err %d\n",
+					phy_ops_name[type], err);
+			else
+				dev_err(dev, "fail to %s per-lane PHY#%u, err %d\n",
+					phy_ops_name[type], i, err);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
 /**
  * rockchip_pcie_init_port - Initialize hardware
  * @rockchip: PCIe port information
@@ -537,11 +647,9 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
 		return err;
 	}
 
-	err = phy_init(rockchip->phy);
-	if (err < 0) {
-		dev_err(dev, "fail to init phy, err %d\n", err);
+	err = rockchip_pcie_manipulate_phys(rockchip, PHY_INIT);
+	if (err < 0)
 		return err;
-	}
 
 	err = reset_control_assert(rockchip->core_rst);
 	if (err) {
@@ -602,11 +710,9 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
 			    PCIE_CLIENT_MODE_RC,
 			    PCIE_CLIENT_CONFIG);
 
-	err = phy_power_on(rockchip->phy);
-	if (err) {
-		dev_err(dev, "fail to power on phy, err %d\n", err);
+	err = rockchip_pcie_manipulate_phys(rockchip, PHY_PWR_ON);
+	if (err)
 		return err;
-	}
 
 	/*
 	 * Please don't reorder the deassert sequence of the following
@@ -853,20 +959,6 @@ static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
-static int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip)
-{
-	struct device *dev = rockchip->dev;
-
-	rockchip->phy = devm_phy_get(dev, "pcie-phy");
-	if (IS_ERR(rockchip->phy)) {
-		if (PTR_ERR(rockchip->phy) != -EPROBE_DEFER)
-			dev_err(dev, "missing phy\n");
-		return PTR_ERR(rockchip->phy);
-	}
-
-	return 0;
-}
-
 /**
  * rockchip_pcie_parse_dt - Parse Device Tree
  * @rockchip: PCIe port information
@@ -1295,8 +1387,8 @@ static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
 		return ret;
 	}
 
-	phy_power_off(rockchip->phy);
-	phy_exit(rockchip->phy);
+	rockchip_pcie_manipulate_phys(rockchip, PHY_PWR_OFF);
+	rockchip_pcie_manipulate_phys(rockchip, PHY_EXIT);
 
 	clk_disable_unprepare(rockchip->clk_pcie_pm);
 	clk_disable_unprepare(rockchip->hclk_pcie);
@@ -1538,8 +1630,8 @@ static int rockchip_pcie_remove(struct platform_device *pdev)
 	pci_unmap_iospace(rockchip->io);
 	irq_domain_remove(rockchip->irq_domain);
 
-	phy_power_off(rockchip->phy);
-	phy_exit(rockchip->phy);
+	rockchip_pcie_manipulate_phys(rockchip, PHY_PWR_OFF);
+	rockchip_pcie_manipulate_phys(rockchip, PHY_EXIT);
 
 	clk_disable_unprepare(rockchip->clk_pcie_pm);
 	clk_disable_unprepare(rockchip->hclk_pcie);
-- 
1.9.1


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