Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates
 149.199.62.198 as permitted sender) receiver=protection.outlook.com;
 client-ip=149.199.62.198; helo=xsj-pvapexch01.xlnx.xilinx.com; pr=C
Envelope-to: linux-pci@vger.kernel.org,
 linux-kernel@vger.kernel.org,
 devicetree@vger.kernel.org,
 lorenzo.pieralisi@arm.com,
 bhelgaas@google.com,
 robh@kernel.org
From:   Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
To:     <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>
CC:     <lorenzo.pieralisi@arm.com>, <bhelgaas@google.com>,
        <michals@xilinx.com>, <robh@kernel.org>,
        Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
Subject: [PATCH v5 2/2] PCI: xilinx-cpm: Add support for Versal CPM5 Root Port
Date:   Sat, 18 Jun 2022 08:14:59 +0530
Message-ID: <20220618024459.7554-3-bharat.kumar.gogada@xilinx.com>
In-Reply-To: <20220618024459.7554-1-bharat.kumar.gogada@xilinx.com>
References: <20220618024459.7554-1-bharat.kumar.gogada@xilinx.com>
MIME-Version: 1.0
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jun 2022 02:45:15.9145
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: ac280487-2110-448b-08d6-08da50d49340
X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com]
X-MS-Exchange-CrossTenant-AuthSource: DM3NAM02FT041.eop-nam02.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR02MB5888
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,
        T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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@xilinx.com>
---
 drivers/pci/controller/pcie-xilinx-cpm.c | 62 ++++++++++++++++++++++--
 1 file changed, 59 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c b/drivers/pci/controller/pcie-xilinx-cpm.c
index c7cd44ed4dfc..0bcd11d27eeb 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 +102,16 @@
 /* Phy Status/Control Register definitions */
 #define XILINX_CPM_PCIE_REG_PSCR_LNKUP		BIT(11)
 
+/**
+ * struct xilinx_cpm_variant - CPM variant information
+ * @cpm_version: CPM5 has few changes compared to CPM block.
+ *      CPM5 has dedicated register space for control and status registers.
+ *
+ */
+struct xilinx_cpm_variant {
+	bool cpm_version;
+};
+
 /**
  * struct xilinx_cpm_pcie - PCIe port information
  * @dev: Device pointer
@@ -109,6 +123,7 @@
  * @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 +135,7 @@ 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 +301,14 @@ 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 +508,12 @@ 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,
@@ -503,6 +533,10 @@ static int xilinx_cpm_pcie_parse_dt(struct xilinx_cpm_pcie *port,
 	struct device *dev = port->dev;
 	struct platform_device *pdev = to_platform_device(dev);
 	struct resource *res;
+	const struct xilinx_cpm_variant *variant =
+		of_device_get_match_data(dev);
+
+	port->is_cpm5 = variant->cpm_version;
 
 	port->cpm_base = devm_platform_ioremap_resource_byname(pdev,
 							       "cpm_slcr");
@@ -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->is_cpm5) {
+		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;
 }
@@ -591,9 +632,24 @@ static int xilinx_cpm_pcie_probe(struct platform_device *pdev)
 	return err;
 }
 
+static const struct xilinx_cpm_variant cpm_host = {
+	.cpm_version = false,
+};
+
+static const struct xilinx_cpm_variant cpm5_host = {
+	.cpm_version = true,
+};
+
 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