* grub-core/term/serial.c: Add option for enabling/disabling

RTS/CTS flow control.

ChangeLog

@@ -1,3 +1,8 @@
+2013-11-08  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* b/grub-core/term/serial.c: Add option for enabling/disabling
+	RTS/CTS flow control.
+
 2013-11-08  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/lib/libgcrypt/cipher/idea.c (mul_inv): Remove signed

grub-core/bus/usb/serial/ftdi.c

@@ -91,11 +91,13 @@ real_config (struct grub_serial_port *port)
 
   grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
 			GRUB_FTDI_MODEM_CTRL,
-			GRUB_FTDI_MODEM_CTRL_DTRRTS, 0, 0, 0);
+			port->config.rtscts ? GRUB_FTDI_MODEM_CTRL_DTRRTS : 0,
+			0, 0, 0);
 
   grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
 			GRUB_FTDI_FLOW_CTRL,
-			GRUB_FTDI_FLOW_CTRL_DTRRTS, 0, 0, 0);
+			port->config.rtscts ? GRUB_FTDI_FLOW_CTRL_DTRRTS : 0,
+			0, 0, 0);
 
   divisor = get_divisor (port->config.speed);
   grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,

grub-core/bus/usb/serial/pl2303.c

@@ -125,7 +125,7 @@ real_config (struct grub_serial_port *port)
 			0x22, 3, 0, 0, 0);
 
   grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
-			1, 0, 0x61, 0, 0);
+			1, 0, port->config.rtscts ? 0x61 : 0, 0, 0);
   port->configured = 1;
 }
 

grub-core/term/efi/serial.c

@@ -58,6 +58,10 @@ do_real_config (struct grub_serial_port *port)
 		       stop_bits[port->config.stop_bits]);
   if (status != GRUB_EFI_SUCCESS)
     port->broken = 1;
+
+  status = efi_call_2 (port->interface->set_control_bits, port->interface,
+		       port->config.rtscts ? 0x4002 : 0x2);
+
   port->configured = 1;
 }
 

grub-core/term/ns8250.c

@@ -107,20 +107,22 @@ do_real_config (struct grub_serial_port *port)
 	     | stop_bits[port->config.stop_bits]);
   grub_outb (status, port->port + UART_LCR);
 
-  /* On Loongson machines serial port has only 3 wires.  */
+  if (port->config.rtscts)
-#ifndef GRUB_MACHINE_MIPS_LOONGSON
+    {
       /* Enable the FIFO.  */
       grub_outb (UART_ENABLE_FIFO_TRIGGER1, port->port + UART_FCR);
 
       /* Turn on DTR and RTS.  */
       grub_outb (UART_ENABLE_DTRRTS, port->port + UART_MCR);
-#else
+    }
+  else
+    {
       /* Enable the FIFO.  */
       grub_outb (UART_ENABLE_FIFO_TRIGGER14, port->port + UART_FCR);
 
       /* Turn on DTR, RTS, and OUT2.  */
       grub_outb (UART_ENABLE_DTRRTS | UART_ENABLE_OUT2, port->port + UART_MCR);
-#endif
+    }
 
   /* Drain the input buffer.  */
   endtime = grub_get_time_ms () + 1000;

grub-core/term/serial.c

@@ -47,7 +47,8 @@ enum
     OPTION_WORD,
     OPTION_PARITY,
     OPTION_STOP,
-    OPTION_BASE_CLOCK
+    OPTION_BASE_CLOCK,
+    OPTION_RTSCTS
   };
 
 /* Argument options.  */
@@ -60,6 +61,7 @@ static const struct grub_arg_option options[] =
   {"parity", 'r', 0, N_("Set the serial port parity."),      0, ARG_TYPE_STRING},
   {"stop",   't', 0, N_("Set the serial port stop bits."),   0, ARG_TYPE_INT},
   {"base-clock",   'b', 0, N_("Set the base clock."),   0, ARG_TYPE_STRING},
+  {"rtscts",   'f', 0, N_("Enable/disable RTS/CTS."),   "on|off", ARG_TYPE_STRING},
   {0, 0, 0, 0, 0, 0}
 };
 
@@ -237,6 +239,17 @@ grub_cmd_serial (grub_extcmd_context_t ctxt, int argc, char **args)
 			   N_("unsupported serial port parity"));
     }
 
+  if (state[OPTION_RTSCTS].set)
+    {
+      if (grub_strcmp (state[OPTION_PARITY].arg, "on") == 0)
+	config.rtscts = 1;
+      if (grub_strcmp (state[OPTION_PARITY].arg, "off") == 0)
+	config.rtscts = 0;
+      else
+	return grub_error (GRUB_ERR_BAD_ARGUMENT,
+			   N_("unsupported serial port flow"));
+    }
+
   if (state[OPTION_STOP].set)
     {
       if (! grub_strcmp (state[OPTION_STOP].arg, "1"))

include/grub/efi/api.h

@@ -1244,7 +1244,8 @@ struct grub_efi_serial_io_interface
 				       grub_efi_parity_type_t parity,
 				       grub_uint8_t word_len,
 				       grub_efi_stop_bits_t stop_bits);
-  void (*set_control_bits) (void);
+  grub_efi_status_t (*set_control_bits) (struct grub_efi_serial_io_interface *this,
+					 grub_efi_uint32_t flags);
   void (*get_control_bits) (void);
   grub_efi_status_t (*write) (struct grub_efi_serial_io_interface *this,
 			      grub_efi_uintn_t *buf_size,

include/grub/serial.h

@@ -68,6 +68,7 @@ struct grub_serial_config
   grub_serial_parity_t parity;
   grub_serial_stop_bits_t stop_bits;
   grub_uint64_t base_clock;
+  int rtscts;
 };
 
 struct grub_serial_port
@@ -159,8 +160,11 @@ grub_serial_config_defaults (struct grub_serial_port *port)
     {
 #ifdef GRUB_MACHINE_MIPS_LOONGSON
       .speed = 115200,
+      /* On Loongson machines serial port has only 3 wires.  */
+      .rtscts = 0,
 #else
       .speed = 9600,
+      .rtscts = 1,
 #endif
       .word_len = 8,
       .parity = GRUB_SERIAL_PARITY_NONE,