diff options
Diffstat (limited to 'src/superio/smsc/lpc47n217/lpc47n217_early_serial.c')
| -rw-r--r-- | src/superio/smsc/lpc47n217/lpc47n217_early_serial.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/src/superio/smsc/lpc47n217/lpc47n217_early_serial.c b/src/superio/smsc/lpc47n217/lpc47n217_early_serial.c new file mode 100644 index 0000000000..afe55367d9 --- /dev/null +++ b/src/superio/smsc/lpc47n217/lpc47n217_early_serial.c @@ -0,0 +1,155 @@ +/*
+ * $Header: /home/cvs/BIR/ca-cpu/freebios/src/superio/smsc/lpc47n217/lpc47n217_early_serial.c,v 1.1.1.1 2005/07/11 15:28:51 smagnani Exp $
+ *
+ * lpc47n217_early_serial.c: Pre-RAM driver for SMSC LPC47N217 Super I/O chip
+ *
+ * Copyright (C) 2005 Digital Design Corporation
+ *
+ * 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
+ *
+ * $Log: lpc47n217_early_serial.c,v $
+ * Revision 1.1.1.1 2005/07/11 15:28:51 smagnani
+ * Initial revision.
+ *
+ *
+ */
+
+#include <arch/romcc_io.h>
+#include <assert.h>
+#include "lpc47n217.h"
+
+//----------------------------------------------------------------------------------
+// Function: pnp_enter_conf_state
+// Parameters: dev - high 8 bits = Super I/O port
+// Return Value: None
+// Description: Enable access to the LPC47N217's configuration registers.
+//
+static inline void pnp_enter_conf_state(device_t dev) {
+ unsigned port = dev>>8;
+ outb(0x55, port);
+}
+
+//----------------------------------------------------------------------------------
+// Function: pnp_exit_conf_state
+// Parameters: dev - high 8 bits = Super I/O port
+// Return Value: None
+// Description: Disable access to the LPC47N217's configuration registers.
+//
+static void pnp_exit_conf_state(device_t dev) {
+ unsigned port = dev>>8;
+ outb(0xaa, port);
+}
+
+//----------------------------------------------------------------------------------
+// Function: lpc47n217_pnp_set_iobase
+// Parameters: dev - high 8 bits = Super I/O port,
+// low 8 bits = logical device number (per lpc47n217.h)
+// iobase - base I/O port for the logical device
+// Return Value: None
+// Description: Program the base I/O port for the specified logical device.
+//
+void lpc47n217_pnp_set_iobase(device_t dev, unsigned iobase)
+{
+ // LPC47N217 requires base ports to be a multiple of 4
+ ASSERT(!(iobase & 0x3));
+
+ switch(dev & 0xFF) {
+ case LPC47N217_PP:
+ pnp_write_config(dev, 0x23, (iobase >> 2) & 0xff);
+ break;
+
+ case LPC47N217_SP1:
+ pnp_write_config(dev, 0x24, (iobase >> 2) & 0xff);
+ break;
+
+ case LPC47N217_SP2:
+ pnp_write_config(dev, 0x25, (iobase >> 2) & 0xff);
+ break;
+
+ default:
+ break;
+ }
+}
+
+//----------------------------------------------------------------------------------
+// Function: lpc47n217_pnp_set_enable
+// Parameters: dev - high 8 bits = Super I/O port,
+// low 8 bits = logical device number (per lpc47n217.h)
+// enable - 0 to disable, anythig else to enable
+// Return Value: None
+// Description: Enable or disable the specified logical device.
+// Technically, a full disable requires setting the device's base
+// I/O port below 0x100. We don't do that here, because we don't
+// have access to a data structure that specifies what the 'real'
+// base port is (when asked to enable the device). Also the function
+// is used only to disable the device while its true base port is
+// programmed (see lpc47n217_enable_serial() below).
+//
+void lpc47n217_pnp_set_enable(device_t dev, int enable)
+{
+ uint8_t power_register = 0;
+ uint8_t power_mask = 0;
+ uint8_t current_power;
+ uint8_t new_power;
+
+ switch(dev & 0xFF) {
+ case LPC47N217_PP:
+ power_register = 0x01;
+ power_mask = 0x04;
+ break;
+
+ case LPC47N217_SP1:
+ power_register = 0x02;
+ power_mask = 0x08;
+ break;
+
+ case LPC47N217_SP2:
+ power_register = 0x02;
+ power_mask = 0x80;
+ break;
+
+ default:
+ return;
+ }
+
+ current_power = pnp_read_config(dev, power_register);
+ new_power = current_power & ~power_mask; // disable by default
+
+ if (enable)
+ new_power |= power_mask; // Enable
+
+ pnp_write_config(dev, power_register, new_power);
+}
+
+//----------------------------------------------------------------------------------
+// Function: lpc47n217_enable_serial
+// Parameters: dev - high 8 bits = Super I/O port,
+// low 8 bits = logical device number (per lpc47n217.h)
+// iobase - processor I/O port address to assign to this serial device
+// Return Value: bool
+// Description: Configure the base I/O port of the specified serial device
+// and enable the serial device.
+//
+static void lpc47n217_enable_serial(device_t dev, unsigned iobase)
+{
+ // NOTE: Cannot use pnp_set_XXX() here because they assume chip
+ // support for logical devices, which the LPC47N217 doesn't have
+
+ pnp_enter_conf_state(dev);
+ lpc47n217_pnp_set_enable(dev, 0);
+ lpc47n217_pnp_set_iobase(dev, iobase);
+ lpc47n217_pnp_set_enable(dev, 1);
+ pnp_exit_conf_state(dev);
+}
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