From 0ce5ebd24d25f02c73940f047b12733d84b125e8 Mon Sep 17 00:00:00 2001 From: Thomas Bogendoerfer Date: Thu, 9 Jan 2020 11:34:29 +0100 Subject: mfd: ioc3: Add driver for SGI IOC3 chip SGI IOC3 chip has integrated ethernet, keyboard and mouse interface. It also supports connecting a SuperIO chip for serial and parallel interfaces. IOC3 is used inside various SGI systemboards and add-on cards with different equipped external interfaces. Support for ethernet and serial interfaces were implemented inside the network driver. This patchset moves out the not network related parts to a new MFD driver, which takes care of card detection, setup of platform devices and interrupt distribution for the subdevices. Serial portion: Acked-by: Greg Kroah-Hartman Acked-for-MFD-by: Lee Jones Network part: Reviewed-by: Jakub Kicinski Network part: Acked-by: Jakub Kicinski Signed-off-by: Thomas Bogendoerfer Signed-off-by: Paul Burton Cc: James Hogan Cc: David S. Miller Cc: Jiri Slaby Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: netdev@vger.kernel.org Cc: linux-serial@vger.kernel.org --- drivers/tty/serial/8250/8250_ioc3.c | 98 +++++++++++++++++++++++++++++++++++++ drivers/tty/serial/8250/Kconfig | 11 +++++ drivers/tty/serial/8250/Makefile | 1 + 3 files changed, 110 insertions(+) create mode 100644 drivers/tty/serial/8250/8250_ioc3.c (limited to 'drivers/tty') diff --git a/drivers/tty/serial/8250/8250_ioc3.c b/drivers/tty/serial/8250/8250_ioc3.c new file mode 100644 index 000000000000..4c405f1b9c67 --- /dev/null +++ b/drivers/tty/serial/8250/8250_ioc3.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SGI IOC3 8250 UART driver + * + * Copyright (C) 2019 Thomas Bogendoerfer + * + * based on code Copyright (C) 2005 Stanislaw Skowronek + * Copyright (C) 2014 Joshua Kinard + */ + +#include +#include +#include +#include + +#include "8250.h" + +#define IOC3_UARTCLK (22000000 / 3) + +struct ioc3_8250_data { + int line; +}; + +static unsigned int ioc3_serial_in(struct uart_port *p, int offset) +{ + return readb(p->membase + (offset ^ 3)); +} + +static void ioc3_serial_out(struct uart_port *p, int offset, int value) +{ + writeb(value, p->membase + (offset ^ 3)); +} + +static int serial8250_ioc3_probe(struct platform_device *pdev) +{ + struct ioc3_8250_data *data; + struct uart_8250_port up; + struct resource *r; + void __iomem *membase; + int irq, line; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) + return -ENODEV; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + membase = devm_ioremap_nocache(&pdev->dev, r->start, resource_size(r)); + if (!membase) + return -ENOMEM; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + irq = 0; /* no interrupt -> use polling */ + + /* Register serial ports with 8250.c */ + memset(&up, 0, sizeof(struct uart_8250_port)); + up.port.iotype = UPIO_MEM; + up.port.uartclk = IOC3_UARTCLK; + up.port.type = PORT_16550A; + up.port.irq = irq; + up.port.flags = (UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ); + up.port.dev = &pdev->dev; + up.port.membase = membase; + up.port.mapbase = r->start; + up.port.serial_in = ioc3_serial_in; + up.port.serial_out = ioc3_serial_out; + line = serial8250_register_8250_port(&up); + if (line < 0) + return line; + + platform_set_drvdata(pdev, data); + return 0; +} + +static int serial8250_ioc3_remove(struct platform_device *pdev) +{ + struct ioc3_8250_data *data = platform_get_drvdata(pdev); + + serial8250_unregister_port(data->line); + return 0; +} + +static struct platform_driver serial8250_ioc3_driver = { + .probe = serial8250_ioc3_probe, + .remove = serial8250_ioc3_remove, + .driver = { + .name = "ioc3-serial8250", + } +}; + +module_platform_driver(serial8250_ioc3_driver); + +MODULE_AUTHOR("Thomas Bogendoerfer "); +MODULE_DESCRIPTION("SGI IOC3 8250 UART driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig index fab3d4f20667..af69a5d4ba48 100644 --- a/drivers/tty/serial/8250/Kconfig +++ b/drivers/tty/serial/8250/Kconfig @@ -371,6 +371,17 @@ config SERIAL_8250_EM port hardware found on the Emma Mobile line of processors. If unsure, say N. +config SERIAL_8250_IOC3 + tristate "SGI IOC3 8250 UART support" + depends on SGI_MFD_IOC3 && SERIAL_8250 + select SERIAL_8250_EXTENDED + select SERIAL_8250_SHARE_IRQ + help + Enable this if you have a SGI Origin or Octane machine. This module + provides basic serial support by directly driving the UART chip + behind the IOC3 device on those systems. Maximum baud speed is + 38400bps using this driver. + config SERIAL_8250_RT288X bool "Ralink RT288x/RT305x/RT3662/RT3883 serial port support" depends on SERIAL_8250 diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile index 08c1d8117506..51a6079d3f1f 100644 --- a/drivers/tty/serial/8250/Makefile +++ b/drivers/tty/serial/8250/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_SERIAL_8250_FSL) += 8250_fsl.o obj-$(CONFIG_SERIAL_8250_MEN_MCB) += 8250_men_mcb.o obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o obj-$(CONFIG_SERIAL_8250_EM) += 8250_em.o +obj-$(CONFIG_SERIAL_8250_IOC3) += 8250_ioc3.o obj-$(CONFIG_SERIAL_8250_OMAP) += 8250_omap.o obj-$(CONFIG_SERIAL_8250_LPC18XX) += 8250_lpc18xx.o obj-$(CONFIG_SERIAL_8250_MT6577) += 8250_mtk.o -- cgit v1.2.3