[PATCH v2 1/2] soc: aspeed: add BMC-side PCIe BMC device driver
Grégoire Layet
gregoire.layet at 9elements.com
Mon Jun 8 07:51:22 PDT 2026
Taken from ASPEED 6.18 Kernel SDK
Add support for VUART over PCIe between BMC and host.
This add BMC side driver.
Signed-off-by: Jacky Chou <jacky_chou at aspeedtech.com>
Signed-off-by: aspeedyh <yh_chung at aspeedtech.com>
Signed-off-by: Grégoire Layet <gregoire.layet at 9elements.com>
Tested-by: Grégoire Layet <gregoire.layet at 9elements.com>
---
drivers/soc/aspeed/Kconfig | 7 ++
drivers/soc/aspeed/Makefile | 1 +
drivers/soc/aspeed/aspeed-bmc-dev.c | 187 ++++++++++++++++++++++++++++
3 files changed, 195 insertions(+)
create mode 100644 drivers/soc/aspeed/aspeed-bmc-dev.c
diff --git a/drivers/soc/aspeed/Kconfig b/drivers/soc/aspeed/Kconfig
index f579ee0b5afa..3e1fcf3c3268 100644
--- a/drivers/soc/aspeed/Kconfig
+++ b/drivers/soc/aspeed/Kconfig
@@ -4,6 +4,13 @@ if ARCH_ASPEED || COMPILE_TEST
menu "ASPEED SoC drivers"
+config ASPEED_BMC_DEV
+ tristate "ASPEED BMC Device"
+ default n
+ help
+ Enable support for the ASPEED AST2600 BMC Device.
+ This exposes the PCIe-to-LPC bridge of the BMC to the host over PCIe.
+
config ASPEED_LPC_CTRL
tristate "ASPEED LPC firmware cycle control"
select REGMAP
diff --git a/drivers/soc/aspeed/Makefile b/drivers/soc/aspeed/Makefile
index b35d74592964..fab0d247df66 100644
--- a/drivers/soc/aspeed/Makefile
+++ b/drivers/soc/aspeed/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_ASPEED_BMC_DEV) += aspeed-bmc-dev.o
obj-$(CONFIG_ASPEED_LPC_CTRL) += aspeed-lpc-ctrl.o
obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
obj-$(CONFIG_ASPEED_UART_ROUTING) += aspeed-uart-routing.o
diff --git a/drivers/soc/aspeed/aspeed-bmc-dev.c b/drivers/soc/aspeed/aspeed-bmc-dev.c
new file mode 100644
index 000000000000..7a204b543c97
--- /dev/null
+++ b/drivers/soc/aspeed/aspeed-bmc-dev.c
@@ -0,0 +1,187 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright (C) ASPEED Technology Inc.
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+
+#include <linux/regmap.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/syscon.h>
+
+#define SCU_TRIGGER_MSI
+
+/* AST2600 SCU */
+#define ASPEED_SCU04 0x04
+#define AST2600A3_SCU04 0x05030303
+#define ASPEED_SCUC20 0xC20
+#define ASPEED_SCUC24 0xC24
+#define MSI_ROUTING_MASK GENMASK(11, 10)
+#define PCIDEV1_INTX_MSI_HOST2BMC_EN BIT(18)
+#define MSI_ROUTING_PCIe2LPC_PCIDEV0 (0x1 << 10)
+#define MSI_ROUTING_PCIe2LPC_PCIDEV1 (0x2 << 10)
+
+#define ASPEED_SCU_PCIE_CONF_CTRL 0xC20
+#define SCU_PCIE_CONF_BMC_DEV_EN BIT(8)
+#define SCU_PCIE_CONF_BMC_DEV_EN_MMIO BIT(9)
+#define SCU_PCIE_CONF_BMC_DEV_EN_MSI BIT(11)
+#define SCU_PCIE_CONF_BMC_DEV_EN_IRQ BIT(13)
+#define SCU_PCIE_CONF_BMC_DEV_EN_DMA BIT(14)
+#define SCU_PCIE_CONF_BMC_DEV_EN_E2L BIT(15)
+#define SCU_PCIE_CONF_BMC_DEV_EN_LPC_DECODE BIT(21)
+
+#define ASPEED_SCU_BMC_DEV_CLASS 0xC68
+
+
+struct aspeed_platform {
+ int (*init)(struct platform_device *pdev);
+};
+
+struct aspeed_bmc_device {
+ struct device *dev;
+ int id;
+ void __iomem *reg_base;
+
+ int pcie2lpc;
+ int irq;
+
+ const struct aspeed_platform *platform;
+
+ struct regmap *scu;
+ int pcie_irq;
+};
+
+
+static int aspeed_ast2600_init(struct platform_device *pdev)
+{
+ struct aspeed_bmc_device *bmc_device = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+ u32 pcie_config_ctl = SCU_PCIE_CONF_BMC_DEV_EN_IRQ |
+ SCU_PCIE_CONF_BMC_DEV_EN_MMIO | SCU_PCIE_CONF_BMC_DEV_EN;
+ u32 scu_id;
+
+ bmc_device->scu = syscon_regmap_lookup_by_phandle(dev->of_node, "aspeed,scu");
+ if (IS_ERR(bmc_device->scu)) {
+ dev_err(&pdev->dev, "failed to find SCU regmap\n");
+ return PTR_ERR(bmc_device->scu);
+ }
+
+ if (bmc_device->pcie2lpc)
+ pcie_config_ctl |= SCU_PCIE_CONF_BMC_DEV_EN_E2L |
+ SCU_PCIE_CONF_BMC_DEV_EN_LPC_DECODE;
+
+ regmap_update_bits(bmc_device->scu, ASPEED_SCU_PCIE_CONF_CTRL,
+ pcie_config_ctl, pcie_config_ctl);
+
+ /* update class code to others as it is a MFD device */
+ regmap_write(bmc_device->scu, ASPEED_SCU_BMC_DEV_CLASS, 0xff000000);
+
+#ifdef SCU_TRIGGER_MSI
+ //SCUC24[17]: Enable PCI device 1 INTx/MSI from SCU560[15]. Will be added in next version
+ regmap_update_bits(bmc_device->scu, ASPEED_SCUC20, BIT(11) | BIT(14), BIT(11) | BIT(14));
+
+ regmap_read(bmc_device->scu, ASPEED_SCU04, &scu_id);
+ if (scu_id == AST2600A3_SCU04)
+ regmap_update_bits(bmc_device->scu, ASPEED_SCUC24,
+ PCIDEV1_INTX_MSI_HOST2BMC_EN | MSI_ROUTING_MASK,
+ PCIDEV1_INTX_MSI_HOST2BMC_EN | MSI_ROUTING_PCIe2LPC_PCIDEV1);
+ else
+ regmap_update_bits(bmc_device->scu, ASPEED_SCUC24,
+ BIT(17) | BIT(14) | BIT(11), BIT(17) | BIT(14) | BIT(11));
+#else
+ //SCUC24[18]: Enable PCI device 1 INTx/MSI from Host-to-BMC controller.
+ regmap_update_bits(bmc_device->scu, 0xc24, BIT(18) | BIT(14), BIT(18) | BIT(14));
+#endif
+
+
+ return 0;
+}
+
+
+static struct aspeed_platform ast2600_plaform = {
+ .init = aspeed_ast2600_init
+};
+
+
+static const struct of_device_id aspeed_bmc_device_of_matches[] = {
+ { .compatible = "aspeed,ast2600-bmc-device", .data = &ast2600_plaform },
+ {},
+};
+MODULE_DEVICE_TABLE(of, aspeed_bmc_device_of_matches);
+
+static int aspeed_bmc_device_probe(struct platform_device *pdev)
+{
+ struct aspeed_bmc_device *bmc_device;
+ struct device *dev = &pdev->dev;
+ const void *md = of_device_get_match_data(dev);
+ int ret = 0;
+
+ if (!md)
+ return -ENODEV;
+
+ bmc_device = devm_kzalloc(&pdev->dev, sizeof(struct aspeed_bmc_device), GFP_KERNEL);
+ if (!bmc_device)
+ return -ENOMEM;
+ dev_set_drvdata(dev, bmc_device);
+
+ bmc_device->platform = md;
+
+ bmc_device->id = of_alias_get_id(dev->of_node, "bmcdev");
+ if (bmc_device->id < 0)
+ bmc_device->id = 0;
+
+ bmc_device->dev = dev;
+ bmc_device->reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(bmc_device->reg_base))
+ return PTR_ERR(bmc_device->reg_base);
+
+ bmc_device->irq = platform_get_irq(pdev, 0);
+ if (bmc_device->irq < 0) {
+ dev_err(&pdev->dev, "platform get of irq[=%d] failed!\n", bmc_device->irq);
+ return bmc_device->irq;
+ }
+
+ if (of_property_read_bool(dev->of_node, "pcie2lpc"))
+ bmc_device->pcie2lpc = 1;
+
+ ret = bmc_device->platform->init(pdev);
+ if (ret) {
+ dev_err(dev, "Initialize bmc device failed\n");
+ goto out;
+ }
+
+ dev_info(dev, "aspeed bmc device: driver successfully loaded.\n");
+
+ return 0;
+
+out:
+ dev_warn(dev, "aspeed bmc device: driver init failed (ret=%d)!\n", ret);
+ return ret;
+}
+
+static void aspeed_bmc_device_remove(struct platform_device *pdev)
+{
+ struct aspeed_bmc_device *bmc_device = platform_get_drvdata(pdev);
+
+ devm_free_irq(&pdev->dev, bmc_device->irq, bmc_device);
+ devm_kfree(&pdev->dev, bmc_device);
+}
+
+static struct platform_driver aspeed_bmc_device_driver = {
+ .probe = aspeed_bmc_device_probe,
+ .remove = aspeed_bmc_device_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = aspeed_bmc_device_of_matches,
+ },
+};
+
+module_platform_driver(aspeed_bmc_device_driver);
+
+MODULE_AUTHOR("Ryan Chen <ryan_chen at aspeedtech.com>");
+MODULE_DESCRIPTION("ASPEED BMC DEVICE Driver");
+MODULE_LICENSE("GPL");
\ No newline at end of file
--
2.51.2
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