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

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Message-ID: <20220204130216.2206-3-bharat.kumar.gogada@xilinx.com>
Date:   Fri, 4 Feb 2022 18:32:16 +0530
From:   Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <michals@...inx.com>,
        Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
Subject: [PATCH 2/2] PCI: xilinx-cpm: Add support for Versal CPM5 Root Port driver

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 | 33 +++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c b/drivers/pci/controller/pcie-xilinx-cpm.c
index c7cd44ed4dfc..eb69f494571a 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
@@ -109,6 +113,7 @@
  * @intx_irq: legacy interrupt number
  * @irq: Error interrupt number
  * @lock: lock protecting shared register access
+ * @is_cpm5: value to check cpm version
  */
 struct xilinx_cpm_pcie {
 	struct device			*dev;
@@ -120,6 +125,7 @@ struct xilinx_cpm_pcie {
 	int				intx_irq;
 	int				irq;
 	raw_spinlock_t			lock;
+	bool                            is_cpm5;
 };
 
 static u32 pcie_read(struct xilinx_cpm_pcie *port, u32 reg)
@@ -285,6 +291,14 @@ 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->is_cpm5) {
+		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 +498,12 @@ 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->is_cpm5) {
+		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,
@@ -504,6 +524,9 @@ static int xilinx_cpm_pcie_parse_dt(struct xilinx_cpm_pcie *port,
 	struct platform_device *pdev = to_platform_device(dev);
 	struct resource *res;
 
+	if (of_device_is_compatible(dev->of_node, "xlnx,versal-cpm5-host-1.00"))
+		port->is_cpm5 = true;
+
 	port->cpm_base = devm_platform_ioremap_resource_byname(pdev,
 							       "cpm_slcr");
 	if (IS_ERR(port->cpm_base))
@@ -518,7 +541,14 @@ 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->is_cpm5) {
+		port->reg_base = port->cfg->win;
+	} else {
+		port->reg_base = devm_platform_ioremap_resource_byname(pdev,
+								       "cpm_csr");
+		if (IS_ERR(port->reg_base))
+			return PTR_ERR(port->reg_base);
+	}
 
 	return 0;
 }
@@ -593,6 +623,7 @@ static int xilinx_cpm_pcie_probe(struct platform_device *pdev)
 
 static const struct of_device_id xilinx_cpm_pcie_of_match[] = {
 	{ .compatible = "xlnx,versal-cpm-host-1.00", },
+	{ .compatible = "xlnx,versal-cpm5-host-1.00", },
 	{}
 };
 
-- 
2.17.1