Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / misc / ibmasm / uart.c

diff --git a/kernel/drivers/misc/ibmasm/uart.c b/kernel/drivers/misc/ibmasm/uart.c
new file mode 100644 (file)
index 0000000..01e2b0d
--- /dev/null
+++ b/kernel/drivers/misc/ibmasm/uart.c
@@ -0,0 +1,72 @@
+
+/*
+ * IBM ASM Service Processor Device Driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2004
+ *
+ * Author: Max Asböck <amax@us.ibm.com>
+ *
+ */
+
+#include <linux/termios.h>
+#include <linux/tty.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/serial_8250.h>
+#include "ibmasm.h"
+#include "lowlevel.h"
+
+
+void ibmasm_register_uart(struct service_processor *sp)
+{
+       struct uart_8250_port uart;
+       void __iomem *iomem_base;
+
+       iomem_base = sp->base_address + SCOUT_COM_B_BASE;
+
+       /* read the uart scratch register to determine if the UART
+        * is dedicated to the service processor or if the OS can use it
+        */
+       if (0 == readl(iomem_base + UART_SCR)) {
+               dev_info(sp->dev, "IBM SP UART not registered, owned by service processor\n");
+               sp->serial_line = -1;
+               return;
+       }
+
+       memset(&uart, 0, sizeof(uart));
+       uart.port.irq           = sp->irq;
+       uart.port.uartclk       = 3686400;
+       uart.port.flags         = UPF_SHARE_IRQ;
+       uart.port.iotype        = UPIO_MEM;
+       uart.port.membase       = iomem_base;
+
+       sp->serial_line = serial8250_register_8250_port(&uart);
+       if (sp->serial_line < 0) {
+               dev_err(sp->dev, "Failed to register serial port\n");
+               return;
+       }
+       enable_uart_interrupts(sp->base_address);
+}
+
+void ibmasm_unregister_uart(struct service_processor *sp)
+{
+       if (sp->serial_line < 0)
+               return;
+
+       disable_uart_interrupts(sp->base_address);
+       serial8250_unregister_port(sp->serial_line);
+}