first round name simplification. drop the <component>_ prefix.

the prefix was introduced in the early v2 tree many years ago
because our old build system "newconfig" could not handle two files with
the same name in different paths like /path/to/usb.c and
/another/path/to/usb.c correctly. Only one of the files would end up
being compiled into the final image.

Since Kconfig (actually since shortly before we switched to Kconfig) we
don't suffer from that problem anymore. So we could drop the sb700_
prefix from all those filenames (or, the <componentname>_ prefix in general)

- makes it easier to fork off a new chipset
- makes it easier to diff against other chipsets
- storing redundant information in filenames seems wrong

Signed-off-by: <stepan@coresystems.de>

Acked-by: Patrick Georgi <patrick@georgi-clan.de>
Acked-by: Peter Stuge <peter@stuge.se>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6149 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 196 insertions, 0 deletions

diff --git a/src/southbridge/intel/i82801dx/early_smbus.c b/src/southbridge/intel/i82801dx/early_smbus.c
new file mode 100644
index 000000000000..f58cd863427a
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/early_smbus.c
@@ -0,0 +1,196 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2004 Ronald G. Minnich
+ *
+ * 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; version 2 of
+ * the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include "i82801dx.h"
+
+#define SMBHSTSTAT 0x0
+#define SMBHSTCTL  0x2
+#define SMBHSTCMD  0x3
+#define SMBXMITADD 0x4
+#define SMBHSTDAT0 0x5
+#define SMBHSTDAT1 0x6
+#define SMBBLKDAT  0x7
+#define SMBTRNSADD 0x9
+#define SMBSLVDATA 0xa
+#define SMLINK_PIN_CTL 0xe
+#define SMBUS_PIN_CTL  0xf
+
+/* Between 1-10 seconds, We should never timeout normally
+ * Longer than this is just painful when a timeout condition occurs.
+ */
+//#define SMBUS_TIMEOUT (100*1000*10)
+
+static void enable_smbus(void)
+{
+	device_t dev = PCI_DEV(0x0, 0x1f, 0x3);
+
+	printk(BIOS_DEBUG, "SMBus controller enabled\n");
+	/* set smbus iobase */
+	pci_write_config32(dev, 0x20, SMBUS_IO_BASE | 1);
+	/* Set smbus enable */
+	pci_write_config8(dev, 0x40, 0x01);
+	/* Set smbus iospace enable */
+	pci_write_config16(dev, 0x4, 0x01);
+	/* Disable interrupt generation */
+	outb(0, SMBUS_IO_BASE + SMBHSTCTL);
+	/* clear any lingering errors, so the transaction will run */
+	outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
+}
+
+static inline void smbus_delay(void)
+{
+	outb(0x80, 0x80);
+}
+
+static int smbus_wait_until_active(void)
+{
+	unsigned long loops;
+	loops = SMBUS_TIMEOUT;
+	do {
+		unsigned char val;
+		smbus_delay();
+		val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
+		if ((val & 1)) {
+			break;
+		}
+	} while (--loops);
+	return loops ? 0 : -4;
+}
+
+static int smbus_wait_until_ready(void)
+{
+	unsigned long loops;
+	loops = SMBUS_TIMEOUT;
+	do {
+		unsigned char val;
+		smbus_delay();
+		val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
+		if ((val & 1) == 0) {
+			break;
+		}
+		if (loops == (SMBUS_TIMEOUT / 2)) {
+			outb(inb(SMBUS_IO_BASE + SMBHSTSTAT),
+			     SMBUS_IO_BASE + SMBHSTSTAT);
+		}
+	} while (--loops);
+	return loops ? 0 : -2;
+}
+
+static int smbus_wait_until_done(void)
+{
+	unsigned long loops;
+	loops = SMBUS_TIMEOUT;
+	do {
+		unsigned char val;
+		smbus_delay();
+
+		val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
+		if ((val & 1) == 0) {
+			break;
+		}
+		if ((val & ~((1 << 6) | (1 << 0))) != 0) {
+			break;
+		}
+	} while (--loops);
+	return loops ? 0 : -3;
+}
+
+static int smbus_read_byte(unsigned device, unsigned address)
+{
+	unsigned char global_status_register;
+	unsigned char byte;
+
+	/* printk(BIOS_ERR, "smbus_read_byte\n"); */
+	if (smbus_wait_until_ready() < 0) {
+		printk(BIOS_ERR, "SMBUS not ready (%02x)\n", -2);
+		return -2;
+	}
+
+	/* setup transaction */
+	/* disable interrupts */
+	outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xfe, SMBUS_IO_BASE + SMBHSTCTL);
+	/* set the device I'm talking too */
+	outb(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBXMITADD);
+	/* set the command/address... */
+	outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
+	/* set up for a byte data read */
+	outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xe3) | (0x2 << 2),
+	     SMBUS_IO_BASE + SMBHSTCTL);
+
+	/* clear any lingering errors, so the transaction will run */
+	outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
+
+	/* clear the data byte... */
+	outb(0, SMBUS_IO_BASE + SMBHSTDAT0);
+
+	/* start a byte read, with interrupts disabled */
+	outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40),
+	     SMBUS_IO_BASE + SMBHSTCTL);
+	/* poll for it to start */
+	if (smbus_wait_until_active() < 0) {
+		printk(BIOS_ERR, "SMBUS not active (%02x)\n", -4);
+		return -4;
+	}
+
+	/* poll for transaction completion */
+	if (smbus_wait_until_done() < 0) {
+		printk(BIOS_ERR, "SMBUS not completed (%02x)\n", -3);
+		return -3;
+	}
+
+	global_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT) & ~(1 << 6);	/* Ignore the In Use Status... */
+
+	/* read results of transaction */
+	byte = inb(SMBUS_IO_BASE + SMBHSTDAT0);
+
+	if (global_status_register != 2) {
+		//printk(BIOS_SPEW, "%s: no device (%02x, %02x)\n", __func__, device, address);
+		return -1;
+	}
+	//printk(BIOS_DEBUG, "%s: %02x@%02x = %02x\n", __func__, device, address, byte);
+	return byte;
+}
+
+#if 0
+static void smbus_write_byte(unsigned device, unsigned address,
+			     unsigned char val)
+{
+	if (smbus_wait_until_ready() < 0) {
+		return;
+	}
+
+	/* by LYH */
+	outb(0x37, SMBUS_IO_BASE + SMBHSTSTAT);
+	/* set the device I'm talking too */
+	outw(((device & 0x7f) << 1) | 0, SMBUS_IO_BASE + SMBHSTADDR);
+
+	/* data to send */
+	outb(val, SMBUS_IO_BASE + SMBHSTDAT);
+
+	outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
+
+	/* start the command */
+	outb(0xa, SMBUS_IO_BASE + SMBHSTCTL);
+
+	/* poll for transaction completion */
+	smbus_wait_until_done();
+	return;
+}
+#endif