PCI: rockchip: Split out common function to init controller

Most of the initialization are used for both of RC driver and
EP driver; factor the initialization out to a new function,
rockchip_pcie_init_port(), in pcie-rockchip.c and rename the
original function to rockchip_pcie_host_init_port() to avoid
confusion. No functional changed intended.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Jeffy Chen <jeffy.chen@rock-chips.com>

3 files changed, 152 insertions, 125 deletions

diff --git a/drivers/pci/host/pcie-rockchip-host.c b/drivers/pci/host/pcie-rockchip-host.c
index cf9713025061..388dbef8f23e 100644
--- a/drivers/pci/host/pcie-rockchip-host.c
+++ b/drivers/pci/host/pcie-rockchip-host.c
@@ -293,137 +293,20 @@ static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
 }
 
 /**
- * rockchip_pcie_init_port - Initialize hardware
+ * rockchip_pcie_host_init_port - Initialize hardware
  * @rockchip: PCIe port information
  */
-static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
+static int rockchip_pcie_host_init_port(struct rockchip_pcie *rockchip)
 {
 	struct device *dev = rockchip->dev;
-	int err, i;
+	int err, i = MAX_LANE_NUM;
 	u32 status;
 
 	gpiod_set_value_cansleep(rockchip->ep_gpio, 0);
 
-	err = reset_control_assert(rockchip->aclk_rst);
-	if (err) {
-		dev_err(dev, "assert aclk_rst err %d\n", err);
-		return err;
-	}
-
-	err = reset_control_assert(rockchip->pclk_rst);
-	if (err) {
-		dev_err(dev, "assert pclk_rst err %d\n", err);
-		return err;
-	}
-
-	err = reset_control_assert(rockchip->pm_rst);
-	if (err) {
-		dev_err(dev, "assert pm_rst err %d\n", err);
+	err = rockchip_pcie_init_port(rockchip);
+	if (err)
 		return err;
-	}
-
-	for (i = 0; i < MAX_LANE_NUM; i++) {
-		err = phy_init(rockchip->phys[i]);
-		if (err) {
-			dev_err(dev, "init phy%d err %d\n", i, err);
-			goto err_exit_phy;
-		}
-	}
-
-	err = reset_control_assert(rockchip->core_rst);
-	if (err) {
-		dev_err(dev, "assert core_rst err %d\n", err);
-		goto err_exit_phy;
-	}
-
-	err = reset_control_assert(rockchip->mgmt_rst);
-	if (err) {
-		dev_err(dev, "assert mgmt_rst err %d\n", err);
-		goto err_exit_phy;
-	}
-
-	err = reset_control_assert(rockchip->mgmt_sticky_rst);
-	if (err) {
-		dev_err(dev, "assert mgmt_sticky_rst err %d\n", err);
-		goto err_exit_phy;
-	}
-
-	err = reset_control_assert(rockchip->pipe_rst);
-	if (err) {
-		dev_err(dev, "assert pipe_rst err %d\n", err);
-		goto err_exit_phy;
-	}
-
-	udelay(10);
-
-	err = reset_control_deassert(rockchip->pm_rst);
-	if (err) {
-		dev_err(dev, "deassert pm_rst err %d\n", err);
-		goto err_exit_phy;
-	}
-
-	err = reset_control_deassert(rockchip->aclk_rst);
-	if (err) {
-		dev_err(dev, "deassert aclk_rst err %d\n", err);
-		goto err_exit_phy;
-	}
-
-	err = reset_control_deassert(rockchip->pclk_rst);
-	if (err) {
-		dev_err(dev, "deassert pclk_rst err %d\n", err);
-		goto err_exit_phy;
-	}
-
-	if (rockchip->link_gen == 2)
-		rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_2,
-				    PCIE_CLIENT_CONFIG);
-	else
-		rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_1,
-				    PCIE_CLIENT_CONFIG);
-
-	rockchip_pcie_write(rockchip,
-			    PCIE_CLIENT_CONF_ENABLE |
-			    PCIE_CLIENT_LINK_TRAIN_ENABLE |
-			    PCIE_CLIENT_ARI_ENABLE |
-			    PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes) |
-			    PCIE_CLIENT_MODE_RC,
-			    PCIE_CLIENT_CONFIG);
-
-	for (i = 0; i < MAX_LANE_NUM; i++) {
-		err = phy_power_on(rockchip->phys[i]);
-		if (err) {
-			dev_err(dev, "power on phy%d err %d\n", i, err);
-			goto err_power_off_phy;
-		}
-	}
-
-	/*
-	 * Please don't reorder the deassert sequence of the following
-	 * four reset pins.
-	 */
-	err = reset_control_deassert(rockchip->mgmt_sticky_rst);
-	if (err) {
-		dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err);
-		goto err_power_off_phy;
-	}
-
-	err = reset_control_deassert(rockchip->core_rst);
-	if (err) {
-		dev_err(dev, "deassert core_rst err %d\n", err);
-		goto err_power_off_phy;
-	}
-
-	err = reset_control_deassert(rockchip->mgmt_rst);
-	if (err) {
-		dev_err(dev, "deassert mgmt_rst err %d\n", err);
-		goto err_power_off_phy;
-	}
-
-	err = reset_control_deassert(rockchip->pipe_rst);
-	if (err) {
-		dev_err(dev, "deassert pipe_rst err %d\n", err);
-		goto err_power_off_phy;
-	}
 
 	/* Fix the transmitted FTS count desired to exit from L0s. */
 	status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1);
@@ -517,7 +400,6 @@ err_power_off_phy:
 	while (i--)
 		phy_power_off(rockchip->phys[i]);
 	i = MAX_LANE_NUM;
-err_exit_phy:
 	while (i--)
 		phy_exit(rockchip->phys[i]);
 	return err;
@@ -1036,7 +918,7 @@ static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev)
 	if (err)
 		goto err_disable_0v9;
 
-	err = rockchip_pcie_init_port(rockchip);
+	err = rockchip_pcie_host_init_port(rockchip);
 	if (err)
 		goto err_pcie_resume;
 
@@ -1101,7 +983,7 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
 		goto err_set_vpcie;
 	}
 
-	err = rockchip_pcie_init_port(rockchip);
+	err = rockchip_pcie_host_init_port(rockchip);
 	if (err)
 		goto err_vpcie;
 
diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index bcc222b060c6..b27e975a0a90 100644
--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/of_pci.h>
 #include <linux/phy/phy.h>
@@ -145,6 +146,147 @@ int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
 }
 EXPORT_SYMBOL_GPL(rockchip_pcie_parse_dt);
 
+int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
+{
+	struct device *dev = rockchip->dev;
+	int err, i;
+	u32 regs;
+
+	err = reset_control_assert(rockchip->aclk_rst);
+	if (err) {
+		dev_err(dev, "assert aclk_rst err %d\n", err);
+		return err;
+	}
+
+	err = reset_control_assert(rockchip->pclk_rst);
+	if (err) {
+		dev_err(dev, "assert pclk_rst err %d\n", err);
+		return err;
+	}
+
+	err = reset_control_assert(rockchip->pm_rst);
+	if (err) {
+		dev_err(dev, "assert pm_rst err %d\n", err);
+		return err;
+	}
+
+	for (i = 0; i < MAX_LANE_NUM; i++) {
+		err = phy_init(rockchip->phys[i]);
+		if (err) {
+			dev_err(dev, "init phy%d err %d\n", i, err);
+			goto err_exit_phy;
+		}
+	}
+
+	err = reset_control_assert(rockchip->core_rst);
+	if (err) {
+		dev_err(dev, "assert core_rst err %d\n", err);
+		goto err_exit_phy;
+	}
+
+	err = reset_control_assert(rockchip->mgmt_rst);
+	if (err) {
+		dev_err(dev, "assert mgmt_rst err %d\n", err);
+		goto err_exit_phy;
+	}
+
+	err = reset_control_assert(rockchip->mgmt_sticky_rst);
+	if (err) {
+		dev_err(dev, "assert mgmt_sticky_rst err %d\n", err);
+		goto err_exit_phy;
+	}
+
+	err = reset_control_assert(rockchip->pipe_rst);
+	if (err) {
+		dev_err(dev, "assert pipe_rst err %d\n", err);
+		goto err_exit_phy;
+	}
+
+	udelay(10);
+
+	err = reset_control_deassert(rockchip->pm_rst);
+	if (err) {
+		dev_err(dev, "deassert pm_rst err %d\n", err);
+		goto err_exit_phy;
+	}
+
+	err = reset_control_deassert(rockchip->aclk_rst);
+	if (err) {
+		dev_err(dev, "deassert aclk_rst err %d\n", err);
+		goto err_exit_phy;
+	}
+
+	err = reset_control_deassert(rockchip->pclk_rst);
+	if (err) {
+		dev_err(dev, "deassert pclk_rst err %d\n", err);
+		goto err_exit_phy;
+	}
+
+	if (rockchip->link_gen == 2)
+		rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_2,
+				    PCIE_CLIENT_CONFIG);
+	else
+		rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_1,
+				    PCIE_CLIENT_CONFIG);
+
+	regs = PCIE_CLIENT_LINK_TRAIN_ENABLE | PCIE_CLIENT_ARI_ENABLE |
+	       PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes);
+
+	if (rockchip->is_rc)
+		regs |= PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC;
+	else
+		regs |= PCIE_CLIENT_CONF_DISABLE | PCIE_CLIENT_MODE_EP;
+
+	rockchip_pcie_write(rockchip, regs, PCIE_CLIENT_CONFIG);
+
+	for (i = 0; i < MAX_LANE_NUM; i++) {
+		err = phy_power_on(rockchip->phys[i]);
+		if (err) {
+			dev_err(dev, "power on phy%d err %d\n", i, err);
+			goto err_power_off_phy;
+		}
+	}
+
+	/*
+	 * Please don't reorder the deassert sequence of the following
+	 * four reset pins.
+	 */
+	err = reset_control_deassert(rockchip->mgmt_sticky_rst);
+	if (err) {
+		dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err);
+		goto err_power_off_phy;
+	}
+
+	err = reset_control_deassert(rockchip->core_rst);
+	if (err) {
+		dev_err(dev, "deassert core_rst err %d\n", err);
+		goto err_power_off_phy;
+	}
+
+	err = reset_control_deassert(rockchip->mgmt_rst);
+	if (err) {
+		dev_err(dev, "deassert mgmt_rst err %d\n", err);
+		goto err_power_off_phy;
+	}
+
+	err = reset_control_deassert(rockchip->pipe_rst);
+	if (err) {
+		dev_err(dev, "deassert pipe_rst err %d\n", err);
+		goto err_power_off_phy;
+	}
+
+	return 0;
+err_power_off_phy:
+	while (i--)
+		phy_power_off(rockchip->phys[i]);
+	i = MAX_LANE_NUM;
+err_exit_phy:
+	while (i--)
+		phy_exit(rockchip->phys[i]);
+	return err;
+}
+EXPORT_SYMBOL_GPL(rockchip_pcie_init_port);
+
 int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip)
 {
 	struct device *dev = rockchip->dev;
diff --git a/drivers/pci/host/pcie-rockchip.h b/drivers/pci/host/pcie-rockchip.h
index 473e74f85749..6f6e7adf0331 100644
--- a/drivers/pci/host/pcie-rockchip.h
+++ b/drivers/pci/host/pcie-rockchip.h
@@ -27,10 +27,12 @@
 #define PCIE_CLIENT_BASE		0x0
 #define PCIE_CLIENT_CONFIG		(PCIE_CLIENT_BASE + 0x00)
 #define   PCIE_CLIENT_CONF_ENABLE	  HIWORD_UPDATE_BIT(0x0001)
+#define   PCIE_CLIENT_CONF_DISABLE       HIWORD_UPDATE(0x0001, 0)
 #define   PCIE_CLIENT_LINK_TRAIN_ENABLE	  HIWORD_UPDATE_BIT(0x0002)
 #define   PCIE_CLIENT_ARI_ENABLE	  HIWORD_UPDATE_BIT(0x0008)
 #define   PCIE_CLIENT_CONF_LANE_NUM(x)	  HIWORD_UPDATE(0x0030, ENCODE_LANES(x))
 #define   PCIE_CLIENT_MODE_RC		  HIWORD_UPDATE_BIT(0x0040)
+#define   PCIE_CLIENT_MODE_EP            HIWORD_UPDATE(0x0040, 0)
 #define   PCIE_CLIENT_GEN_SEL_1		  HIWORD_UPDATE(0x0080, 0)
 #define   PCIE_CLIENT_GEN_SEL_2		  HIWORD_UPDATE_BIT(0x0080)
 #define PCIE_CLIENT_DEBUG_OUT_0		(PCIE_CLIENT_BASE + 0x3c)
@@ -237,6 +239,7 @@ static void rockchip_pcie_write(struct rockchip_pcie *rockchip, u32 val,
 }
 
 int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip);
+int rockchip_pcie_init_port(struct rockchip_pcie *rockchip);
 int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip);
 void rockchip_pcie_deinit_phys(struct rockchip_pcie *rockchip);
 int rockchip_pcie_enable_clocks(struct rockchip_pcie *rockchip);