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Message-Id: <162d064228261ccd0bf9313a20288e510912effd.1757467895.git.unicorn_wang@outlook.com>
Date: Wed, 10 Sep 2025 10:08:39 +0800
From: Chen Wang <unicornxw@...il.com>
To: kwilczynski@...nel.org,
u.kleine-koenig@...libre.com,
aou@...s.berkeley.edu,
alex@...ti.fr,
arnd@...db.de,
bwawrzyn@...co.com,
bhelgaas@...gle.com,
unicorn_wang@...look.com,
conor+dt@...nel.org,
18255117159@....com,
inochiama@...il.com,
kishon@...nel.org,
krzk+dt@...nel.org,
lpieralisi@...nel.org,
mani@...nel.org,
palmer@...belt.com,
paul.walmsley@...ive.com,
robh@...nel.org,
s-vadapalli@...com,
tglx@...utronix.de,
thomas.richard@...tlin.com,
sycamoremoon376@...il.com,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org,
linux-riscv@...ts.infradead.org,
sophgo@...ts.linux.dev,
rabenda.cn@...il.com,
chao.wei@...hgo.com,
xiaoguang.xing@...hgo.com,
fengchun.li@...hgo.com
Subject: [PATCH v2 3/7] PCI: sg2042: Add Sophgo SG2042 PCIe driver
From: Chen Wang <unicorn_wang@...look.com>
Add support for PCIe controller in SG2042 SoC. The controller
uses the Cadence PCIe core programmed by pcie-cadence*.c. The
PCIe controller will work in host mode only, supporting data
rate(gen4) and lanes(x16 or x8).
Signed-off-by: Chen Wang <unicorn_wang@...look.com>
---
drivers/pci/controller/cadence/Kconfig | 10 ++
drivers/pci/controller/cadence/Makefile | 1 +
drivers/pci/controller/cadence/pcie-sg2042.c | 104 +++++++++++++++++++
3 files changed, 115 insertions(+)
create mode 100644 drivers/pci/controller/cadence/pcie-sg2042.c
diff --git a/drivers/pci/controller/cadence/Kconfig b/drivers/pci/controller/cadence/Kconfig
index 666e16b6367f..02a639e55fd8 100644
--- a/drivers/pci/controller/cadence/Kconfig
+++ b/drivers/pci/controller/cadence/Kconfig
@@ -42,6 +42,15 @@ config PCIE_CADENCE_PLAT_EP
endpoint mode. This PCIe controller may be embedded into many
different vendors SoCs.
+config PCIE_SG2042_HOST
+ tristate "Sophgo SG2042 PCIe controller (host mode)"
+ depends on OF && (ARCH_SOPHGO || COMPILE_TEST)
+ select PCIE_CADENCE_HOST
+ help
+ Say Y here if you want to support the Sophgo SG2042 PCIe platform
+ controller in host mode. Sophgo SG2042 PCIe controller uses Cadence
+ PCIe core.
+
config PCI_J721E
tristate
select PCIE_CADENCE_HOST if PCI_J721E_HOST != n
@@ -67,4 +76,5 @@ config PCI_J721E_EP
Say Y here if you want to support the TI J721E PCIe platform
controller in endpoint mode. TI J721E PCIe controller uses Cadence PCIe
core.
+
endmenu
diff --git a/drivers/pci/controller/cadence/Makefile b/drivers/pci/controller/cadence/Makefile
index 9bac5fb2f13d..5e23f8539ecc 100644
--- a/drivers/pci/controller/cadence/Makefile
+++ b/drivers/pci/controller/cadence/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_PCIE_CADENCE_HOST) += pcie-cadence-host.o
obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o
obj-$(CONFIG_PCIE_CADENCE_PLAT) += pcie-cadence-plat.o
obj-$(CONFIG_PCI_J721E) += pci-j721e.o
+obj-$(CONFIG_PCIE_SG2042_HOST) += pcie-sg2042.o
diff --git a/drivers/pci/controller/cadence/pcie-sg2042.c b/drivers/pci/controller/cadence/pcie-sg2042.c
new file mode 100644
index 000000000000..c026e1ca5d6e
--- /dev/null
+++ b/drivers/pci/controller/cadence/pcie-sg2042.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * pcie-sg2042 - PCIe controller driver for Sophgo SG2042 SoC
+ *
+ * Copyright (C) 2025 Sophgo Technology Inc.
+ * Copyright (C) 2025 Chen Wang <unicorn_wang@...look.com>
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "pcie-cadence.h"
+
+/*
+ * SG2042 only supports 4-byte aligned access, so for the rootbus (i.e. to
+ * read/write the Root Port itself, read32/write32 is required. For
+ * non-rootbus (i.e. to read/write the PCIe peripheral registers, supports
+ * 1/2/4 byte aligned access, so directly using read/write should be fine.
+ */
+
+static struct pci_ops sg2042_pcie_root_ops = {
+ .map_bus = cdns_pci_map_bus,
+ .read = pci_generic_config_read32,
+ .write = pci_generic_config_write32,
+};
+
+static struct pci_ops sg2042_pcie_child_ops = {
+ .map_bus = cdns_pci_map_bus,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
+};
+
+static int sg2042_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct pci_host_bridge *bridge;
+ struct cdns_pcie *pcie;
+ struct cdns_pcie_rc *rc;
+ int ret;
+
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
+ if (!bridge) {
+ dev_err_probe(dev, -ENOMEM, "Failed to alloc host bridge!\n");
+ return -ENOMEM;
+ }
+
+ bridge->ops = &sg2042_pcie_root_ops;
+ bridge->child_ops = &sg2042_pcie_child_ops;
+
+ rc = pci_host_bridge_priv(bridge);
+ pcie = &rc->pcie;
+ pcie->dev = dev;
+
+ platform_set_drvdata(pdev, pcie);
+
+ pm_runtime_set_active(dev);
+ pm_runtime_no_callbacks(dev);
+ devm_pm_runtime_enable(dev);
+
+ ret = cdns_pcie_init_phy(dev, pcie);
+ if (ret) {
+ dev_err_probe(dev, ret, "Failed to init phy!\n");
+ return ret;
+ }
+
+ ret = cdns_pcie_host_setup(rc);
+ if (ret) {
+ dev_err_probe(dev, ret, "Failed to setup host!\n");
+ cdns_pcie_disable_phy(pcie);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void sg2042_pcie_remove(struct platform_device *pdev)
+{
+ struct cdns_pcie *pcie = platform_get_drvdata(pdev);
+
+ cdns_pcie_disable_phy(pcie);
+}
+
+static const struct of_device_id sg2042_pcie_of_match[] = {
+ { .compatible = "sophgo,sg2042-pcie-host" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sg2042_pcie_of_match);
+
+static struct platform_driver sg2042_pcie_driver = {
+ .driver = {
+ .name = "sg2042-pcie",
+ .of_match_table = sg2042_pcie_of_match,
+ .pm = &cdns_pcie_pm_ops,
+ },
+ .probe = sg2042_pcie_probe,
+ .remove = sg2042_pcie_remove,
+};
+module_platform_driver(sg2042_pcie_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PCIe controller driver for SG2042 SoCs");
+MODULE_AUTHOR("Chen Wang <unicorn_wang@...look.com>");
--
2.34.1
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