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Mon, 08 Jun 2026 07:54:23 -0700 (PDT) From: =?UTF-8?q?Gr=C3=A9goire=20Layet?= To: joel@jms.id.au, andrew@codeconstruct.com.au Cc: andrew@lunn.ch, jacky_chou@aspeedtech.com, yh_chung@aspeedtech.com, ninad@linux.ibm.com, linux-aspeed@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Gr=C3=A9goire=20Layet?= Subject: [PATCH v2 1/2] soc: aspeed: add BMC-side PCIe BMC device driver Date: Mon, 8 Jun 2026 14:51:22 +0000 Message-ID: X-Mailer: git-send-email 2.51.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: aspeedyh Signed-off-by: Grégoire Layet Tested-by: Grégoire Layet --- 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 +#include +#include +#include + +#include +#include + +#include +#include +#include + +#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 "); +MODULE_DESCRIPTION("ASPEED BMC DEVICE Driver"); +MODULE_LICENSE("GPL"); \ No newline at end of file -- 2.51.2