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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/misc/ibmasm/uart.c
Initial import
Diffstat (limited to 'drivers/misc/ibmasm/uart.c')
-rw-r--r--drivers/misc/ibmasm/uart.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/misc/ibmasm/uart.c b/drivers/misc/ibmasm/uart.c
new file mode 100644
index 000000000..01e2b0d7e
--- /dev/null
+++ b/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);
+}