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Wysocki" , Len Brown , Bjorn Helgaas , Anup Patel , Thomas Gleixner , Samuel Holland , Greg Kroah-Hartman , Jiri Slaby , Robert Moore , Conor Dooley , Andrew Jones , Andy Shevchenko , Marc Zyngier , Atish Kumar Patra , Andrei Warkentin , Haibo1 Xu , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Sunil V L Subject: [PATCH v5 17/17] serial: 8250: Add 8250_acpi driver Date: Wed, 1 May 2024 17:47:42 +0530 Message-Id: <20240501121742.1215792-18-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240501121742.1215792-1-sunilvl@ventanamicro.com> References: <20240501121742.1215792-1-sunilvl@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 RISC-V has non-PNP generic 16550A compatible UART which needs to be enumerated as ACPI platform device. Add driver support for such devices similar to 8250_of. The driver is enabled when the CONFIG_SERIAL_ACPI_PLATFORM option is enabled. Enable this option for RISC-V. Signed-off-by: Sunil V L --- arch/riscv/configs/defconfig | 1 + drivers/tty/serial/8250/8250_acpi.c | 96 +++++++++++++++++++++++++++++ drivers/tty/serial/8250/Kconfig | 8 +++ drivers/tty/serial/8250/Makefile | 1 + 4 files changed, 106 insertions(+) create mode 100644 drivers/tty/serial/8250/8250_acpi.c diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index 3cae018f9315..bea8241f52eb 100644 --- a/arch/riscv/configs/defconfig +++ b/arch/riscv/configs/defconfig @@ -150,6 +150,7 @@ CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y CONFIG_SERIAL_8250_DW=y CONFIG_SERIAL_OF_PLATFORM=y +CONFIG_SERIAL_ACPI_PLATFORM=y CONFIG_SERIAL_SH_SCI=y CONFIG_SERIAL_EARLYCON_RISCV_SBI=y CONFIG_VIRTIO_CONSOLE=y diff --git a/drivers/tty/serial/8250/8250_acpi.c b/drivers/tty/serial/8250/8250_acpi.c new file mode 100644 index 000000000000..3682443bb69c --- /dev/null +++ b/drivers/tty/serial/8250/8250_acpi.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Serial Port driver for ACPI platform devices + * + * This driver is for generic 16550 compatible UART enumerated via ACPI + * platform bus instead of PNP bus like PNP0501. This is not a full + * driver but mostly provides the ACPI wrapper and uses generic + * 8250 framework for rest of the functionality. + */ + +#include +#include +#include + +#include "8250.h" + +struct acpi_serial_info { + int line; +}; + +static int acpi_platform_serial_probe(struct platform_device *pdev) +{ + struct acpi_serial_info *data; + struct uart_8250_port port8250; + struct device *dev = &pdev->dev; + struct resource *regs; + + int ret, irq; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) { + dev_err(dev, "no registers defined\n"); + return -EINVAL; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + memset(&port8250, 0, sizeof(port8250)); + + spin_lock_init(&port8250.port.lock); + + port8250.port.mapbase = regs->start; + port8250.port.irq = irq; + port8250.port.type = PORT_16550A; + port8250.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | + UPF_IOREMAP | UPF_FIXED_TYPE; + port8250.port.dev = dev; + port8250.port.mapsize = resource_size(regs); + port8250.port.iotype = UPIO_MEM; + port8250.port.irqflags = IRQF_SHARED; + + port8250.port.membase = devm_ioremap(dev, port8250.port.mapbase, port8250.port.mapsize); + if (!port8250.port.membase) + return -ENOMEM; + + ret = uart_read_and_validate_port_properties(&port8250.port); + if (ret) + return -EINVAL; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->line = serial8250_register_8250_port(&port8250); + if (data->line < 0) + return data->line; + + platform_set_drvdata(pdev, data); + return 0; +} + +static void acpi_platform_serial_remove(struct platform_device *pdev) +{ + struct acpi_serial_info *data = platform_get_drvdata(pdev); + + serial8250_unregister_port(data->line); +} + +static const struct acpi_device_id acpi_platform_serial_table[] = { + { "RSCV0003", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, acpi_platform_serial_table); + +static struct platform_driver acpi_platform_serial_driver = { + .driver = { + .name = "acpi_serial", + .acpi_match_table = ACPI_PTR(acpi_platform_serial_table), + }, + .probe = acpi_platform_serial_probe, + .remove_new = acpi_platform_serial_remove, +}; + +builtin_platform_driver(acpi_platform_serial_driver); diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig index 47ff50763c04..fbfe4d3501b1 100644 --- a/drivers/tty/serial/8250/Kconfig +++ b/drivers/tty/serial/8250/Kconfig @@ -576,3 +576,11 @@ config SERIAL_OF_PLATFORM are probed through devicetree, including Open Firmware based PowerPC systems and embedded systems on architectures using the flattened device tree format. + +config SERIAL_ACPI_PLATFORM + tristate "ACPI platform bus based probing for 8250 ports" + depends on SERIAL_8250 && ACPI + default n + help + This option is used for generic 8250 compatible serial ports + that are enumerated through ACPI platform bus. diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile index ea2e81f58eac..8c0ef357fc4e 100644 --- a/drivers/tty/serial/8250/Makefile +++ b/drivers/tty/serial/8250/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_SERIAL_8250_CONSOLE) += 8250_early.o obj-$(CONFIG_SERIAL_8250_ACCENT) += 8250_accent.o obj-$(CONFIG_SERIAL_8250_ACORN) += 8250_acorn.o +obj-$(CONFIG_SERIAL_ACPI_PLATFORM) += 8250_acpi.o obj-$(CONFIG_SERIAL_8250_ASPEED_VUART) += 8250_aspeed_vuart.o obj-$(CONFIG_SERIAL_8250_BCM2835AUX) += 8250_bcm2835aux.o obj-$(CONFIG_SERIAL_8250_BCM7271) += 8250_bcm7271.o