superio/ite/it8721f: Rewrite from hardcoded base addr

Rewrite early_serial.c implementation to honour a passed base address in
device_t, removing any hard coding of values. We also expose early sio
init functions as romstage symbols to avoid falsely #including
"early_serial.c" in romstage.c of board support.

Change-Id: I521b8f7cf85173345b90745c6f2ab66e25429f5d
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5561
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

5 files changed, 47 insertions, 53 deletions

diff --git a/src/superio/ite/it8721f/Makefile.inc b/src/superio/ite/it8721f/Makefile.inc
index 712d020eb2..ef616f4460 100644
--- a/src/superio/ite/it8721f/Makefile.inc
+++ b/src/superio/ite/it8721f/Makefile.inc
@@ -18,5 +18,5 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 ##
 
+romstage-$(CONFIG_SUPERIO_ITE_IT8721F) += early_serial.c
 ramstage-$(CONFIG_SUPERIO_ITE_IT8721F) += superio.c
-
diff --git a/src/superio/ite/it8721f/chip.h b/src/superio/ite/it8721f/chip.h
index bd04460b5a..e903cd651a 100644
--- a/src/superio/ite/it8721f/chip.h
+++ b/src/superio/ite/it8721f/chip.h
@@ -21,11 +21,10 @@
 #ifndef SUPERIO_ITE_IT8721F_CHIP_H
 #define SUPERIO_ITE_IT8721F_CHIP_H
 
-#include <device/device.h>
 #include <pc80/keyboard.h>
 
 struct superio_ite_it8721f_config {
 	struct pc_keyboard keyboard;
 };
 
-#endif
+#endif /* SUPERIO_ITE_IT8721F_CHIP_H */
diff --git a/src/superio/ite/it8721f/early_serial.c b/src/superio/ite/it8721f/early_serial.c
index 20e19b65aa..df662223dc 100644
--- a/src/superio/ite/it8721f/early_serial.c
+++ b/src/superio/ite/it8721f/early_serial.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
  * Copyright (C) 2011 QingPei Wang <wangqingpei@gmail.com>
+ * Copyright (C) 2014 Edward O'Callaghan <eocallaghan@alterapraxis.com>
  *
  * 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
@@ -20,30 +21,25 @@
  */
 
 #include <arch/io.h>
+#include <device/pnp.h>
+#include <stdint.h>
 #include "it8721f.h"
 
-/* The base address is 0x2e or 0x4e, depending on config bytes. */
-#define SIO_BASE                     0x2e
-#define SIO_INDEX                    SIO_BASE
-#define SIO_DATA                     (SIO_BASE + 1)
-
 /* Global configuration registers. */
 #define IT8721F_CONFIG_REG_CC        0x02 /* Configure Control (write-only). */
 #define IT8721F_CONFIG_REG_LDN       0x07 /* Logical Device Number. */
 #define IT8721F_CONFIG_REG_CLOCKSEL  0x23 /* Clock Selection. */
 #define IT8721F_CONFIG_REG_SWSUSP    0x24 /* Software Suspend, Flash I/F. */
 
-static void it8721f_sio_write(u8 ldn, u8 index, u8 value)
+static void it8721f_sio_write(device_t dev, u8 index, u8 value)
 {
-	outb(IT8721F_CONFIG_REG_LDN, SIO_BASE);
-	outb(ldn, SIO_DATA);
-	outb(index, SIO_BASE);
-	outb(value, SIO_DATA);
+	pnp_set_logical_device(dev);
+	pnp_write_config(dev, index, value);
 }
 
-static void it8721f_enter_conf(void)
+static void it8721f_enter_conf(device_t dev)
 {
-	u16 port = 0x2e; /* TODO: Don't hardcode! */
+	u16 port = dev >> 8;
 
 	outb(0x87, port);
 	outb(0x01, port);
@@ -51,43 +47,39 @@ static void it8721f_enter_conf(void)
 	outb((port == 0x4e) ? 0xaa : 0x55, port);
 }
 
-static void it8721f_exit_conf(void)
+static void it8721f_exit_conf(device_t dev)
 {
-	it8721f_sio_write(0x00, IT8721F_CONFIG_REG_CC, 0x02);
+	it8721f_sio_write(dev, IT8721F_CONFIG_REG_CC, 0x02);
 }
 
-/* Select 24MHz CLKIN (48MHz default). */
-void it8721f_24mhz_clkin(void)
+static void it8721f_reg_write(device_t dev, u8 index, u8 value)
 {
-	it8721f_enter_conf();
-	it8721f_sio_write(0x00, IT8721F_CONFIG_REG_CLOCKSEL, 0x1);
-	it8721f_exit_conf();
+	it8721f_enter_conf(dev);
+	it8721f_sio_write(dev, index, value);
+	it8721f_exit_conf(dev);
 }
 
 
-/* Enable the serial port(s). */
-void it8721f_enable_serial(device_t dev, u16 iobase)
+/*
+ * in romstage.c
+ * #define CLKIN_DEV PNP_DEV(0x2e, IT8721F_GPIO)
+ * and pass: CLKIN_DEV
+ * IT8721F_UART_CLK_PREDIVIDE_24
+ * IT8721F_UART_CLK_PREDIVIDE_48 (default)
+ */
+void it8721f_conf_clkin(device_t dev, u8 predivide)
 {
-	/* (1) Enter the configuration state (MB PnP mode). */
-	it8721f_enter_conf();
-
-	/* (2) Modify the data of configuration registers. */
-
-	/*
-	 * Select the chip to configure (if there's more than one).
-	 * Set bit 7 to select JP3=1, clear bit 7 to select JP3=0.
-	 * If this register is not written, both chips are configured.
-	 */
-
-	/* it8718f_sio_write(0x00, IT8718F_CONFIG_REG_CONFIGSEL, 0x00); */
-
-	/* Enable serial port(s). */
-	it8721f_sio_write(IT8721F_SP1, 0x30, 0x1); /* Serial port 1 */
-	it8721f_sio_write(IT8721F_SP2, 0x30, 0x1); /* Serial port 2 */
+	it8721f_reg_write(dev, IT8721F_CONFIG_REG_CLOCKSEL, (0x1 & predivide));
+}
 
-	/* Clear software suspend mode (clear bit 0). TODO: Needed? */
-	/* it8718f_sio_write(0x00, IT8718F_CONFIG_REG_SWSUSP, 0x00); */
 
-	/* (3) Exit the configuration state (MB PnP mode). */
-	it8721f_exit_conf();
+/* Enable the serial port(s). */
+void it8721f_enable_serial(device_t dev, u16 iobase)
+{
+	it8721f_enter_conf(dev);
+	pnp_set_logical_device(dev);
+	pnp_set_enable(dev, 0);
+	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
+	pnp_set_enable(dev, 1);
+	it8721f_exit_conf(dev);
 }
diff --git a/src/superio/ite/it8721f/it8721f.h b/src/superio/ite/it8721f/it8721f.h
index 25300e6659..9d5a528295 100644
--- a/src/superio/ite/it8721f/it8721f.h
+++ b/src/superio/ite/it8721f/it8721f.h
@@ -19,9 +19,13 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#ifndef SUPERIO_ITE_IT8721F_IT8721F_H
-#define SUPERIO_ITE_IT8721F_IT8721F_H
+#ifndef SUPERIO_ITE_IT8721F_H
+#define SUPERIO_ITE_IT8721F_H
 
+#include <device/pnp.h>
+#include <stdint.h>
+
+/* Logical Device Numbers (LDN). */
 #define IT8721F_FDC  0x00 /* Floppy */
 #define IT8721F_SP1  0x01 /* Com1 */
 #define IT8721F_SP2  0x02 /* Com2 */
@@ -32,10 +36,10 @@
 #define IT8721F_GPIO 0x07 /* GPIO */
 #define IT8721F_IR   0x0a /* Consumer IR */
 
-#if defined(__PRE_RAM__)
-void it8721f_24mhz_clkin(void);
-void it8721f_disable_reboot(void);
+#define IT8721F_UART_CLK_PREDIVIDE_48 0x00 /* default */
+#define IT8721F_UART_CLK_PREDIVIDE_24 0x01
+
+void it8721f_conf_clkin(device_t dev, u8 predivide);
 void it8721f_enable_serial(device_t dev, u16 iobase);
-#endif
 
-#endif
+#endif /* SUPERIO_ITE_IT8721F_H */
diff --git a/src/superio/ite/it8721f/superio.c b/src/superio/ite/it8721f/superio.c
index 27eab4905d..300a480e60 100644
--- a/src/superio/ite/it8721f/superio.c
+++ b/src/superio/ite/it8721f/superio.c
@@ -67,8 +67,7 @@ static struct pnp_info pnp_dev_info[] = {
 
 static void enable_dev(struct device *dev)
 {
-	pnp_enable_devices(dev, &pnp_ops,
-		ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
+	pnp_enable_devices(dev, &pnp_ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
 }
 
 struct chip_operations superio_ite_it8721f_ops = {