linux-kernel - [PATCH v6 2/2] PCI: xilinx-cpm: Add support for Versal CPM5 Root Port

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Message-ID: <20220705105646.16980-3-bharat.kumar.gogada@xilinx.com>
Date:   Tue, 5 Jul 2022 16:26:46 +0530
From:   Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <bhelgaas@...gle.com>, <michals@...inx.com>,
        Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
Subject: [PATCH v6 2/2] PCI: xilinx-cpm: Add support for Versal CPM5 Root Port

Xilinx Versal Premium series has CPM5 block which supports Root Port
functioning at Gen5 speed.

Xilinx Versal CPM5 has few changes with existing CPM block.
- CPM5 has dedicated register space for control and status registers.
- CPM5 legacy interrupt handling needs additional register bit
  to enable and handle legacy interrupts.

Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
---
 drivers/pci/controller/pcie-xilinx-cpm.c | 64 ++++++++++++++++++++++--
 1 file changed, 61 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c b/drivers/pci/controller/pcie-xilinx-cpm.c
index c7cd44ed4dfc..65fbcf702a1b 100644
--- a/drivers/pci/controller/pcie-xilinx-cpm.c
+++ b/drivers/pci/controller/pcie-xilinx-cpm.c
@@ -35,6 +35,10 @@
 #define XILINX_CPM_PCIE_MISC_IR_ENABLE	0x00000348
 #define XILINX_CPM_PCIE_MISC_IR_LOCAL	BIT(1)
 
+#define XILINX_CPM_PCIE_IR_STATUS       0x000002A0
+#define XILINX_CPM_PCIE_IR_ENABLE       0x000002A8
+#define XILINX_CPM_PCIE_IR_LOCAL        BIT(0)
+
 /* Interrupt registers definitions */
 #define XILINX_CPM_PCIE_INTR_LINK_DOWN		0
 #define XILINX_CPM_PCIE_INTR_HOT_RESET		3
@@ -98,6 +102,20 @@
 /* Phy Status/Control Register definitions */
 #define XILINX_CPM_PCIE_REG_PSCR_LNKUP		BIT(11)
 
+enum xilinx_cpm_version {
+	CPM,
+	CPM5,
+};
+
+/**
+ * struct xilinx_cpm_variant - CPM variant information
+ * @version: CPM5 has few changes compared to CPM block.
+ *      CPM5 has dedicated register space for control and status registers.
+ */
+struct xilinx_cpm_variant {
+	enum xilinx_cpm_version version;
+};
+
 /**
  * struct xilinx_cpm_pcie - PCIe port information
  * @dev: Device pointer
@@ -109,6 +127,7 @@
  * @intx_irq: legacy interrupt number
  * @irq: Error interrupt number
  * @lock: lock protecting shared register access
+ * @variant: CPM version check pointer
  */
 struct xilinx_cpm_pcie {
 	struct device			*dev;
@@ -120,6 +139,7 @@ struct xilinx_cpm_pcie {
 	int				intx_irq;
 	int				irq;
 	raw_spinlock_t			lock;
+	const struct xilinx_cpm_variant   *variant;
 };
 
 static u32 pcie_read(struct xilinx_cpm_pcie *port, u32 reg)
@@ -285,6 +305,14 @@ static void xilinx_cpm_pcie_event_flow(struct irq_desc *desc)
 		generic_handle_domain_irq(port->cpm_domain, i);
 	pcie_write(port, val, XILINX_CPM_PCIE_REG_IDR);
 
+	if (port->variant->version) {
+		val = readl_relaxed(port->cpm_base + XILINX_CPM_PCIE_IR_STATUS);
+		if (val)
+			writel_relaxed(val,
+				       port->cpm_base +
+				       XILINX_CPM_PCIE_IR_STATUS);
+	}
+
 	/*
 	 * XILINX_CPM_PCIE_MISC_IR_STATUS register is mapped to
 	 * CPM SLCR block.
@@ -484,6 +512,12 @@ static void xilinx_cpm_pcie_init_port(struct xilinx_cpm_pcie *port)
 	 */
 	writel(XILINX_CPM_PCIE_MISC_IR_LOCAL,
 	       port->cpm_base + XILINX_CPM_PCIE_MISC_IR_ENABLE);
+
+	if (port->variant->version) {
+		writel(XILINX_CPM_PCIE_IR_LOCAL,
+		       port->cpm_base + XILINX_CPM_PCIE_IR_ENABLE);
+	}
+
 	/* Enable the Bridge enable bit */
 	pcie_write(port, pcie_read(port, XILINX_CPM_PCIE_REG_RPSC) |
 		   XILINX_CPM_PCIE_REG_RPSC_BEN,
@@ -518,7 +552,14 @@ static int xilinx_cpm_pcie_parse_dt(struct xilinx_cpm_pcie *port,
 	if (IS_ERR(port->cfg))
 		return PTR_ERR(port->cfg);
 
-	port->reg_base = port->cfg->win;
+	if (port->variant->version) {
+		port->reg_base = devm_platform_ioremap_resource_byname(pdev,
+								       "cpm_csr");
+		if (IS_ERR(port->reg_base))
+			return PTR_ERR(port->reg_base);
+	} else {
+		port->reg_base = port->cfg->win;
+	}
 
 	return 0;
 }
@@ -559,6 +600,8 @@ static int xilinx_cpm_pcie_probe(struct platform_device *pdev)
 	if (!bus)
 		return -ENODEV;
 
+	port->variant = of_device_get_match_data(dev);
+
 	err = xilinx_cpm_pcie_parse_dt(port, bus->res);
 	if (err) {
 		dev_err(dev, "Parsing DT failed\n");
@@ -591,9 +634,24 @@ static int xilinx_cpm_pcie_probe(struct platform_device *pdev)
 	return err;
 }
 
+static const struct xilinx_cpm_variant cpm_host = {
+	.version = CPM,
+};
+
+static const struct xilinx_cpm_variant cpm5_host = {
+	.version = CPM5,
+};
+
 static const struct of_device_id xilinx_cpm_pcie_of_match[] = {
-	{ .compatible = "xlnx,versal-cpm-host-1.00", },
-	{}
+	{
+		.compatible = "xlnx,versal-cpm-host-1.00",
+		.data = &cpm_host,
+	},
+	{
+		.compatible = "xlnx,versal-cpm5-host",
+		.data = &cpm5_host,
+	},
+	{},
 };
 
 static struct platform_driver xilinx_cpm_pcie_driver = {
-- 
2.17.1