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, 213 insertions, 0 deletions

diff --git a/src/southbridge/amd/cs5536/early_smbus.c b/src/southbridge/amd/cs5536/early_smbus.c
new file mode 100644
index 0000000000..5cb815d250
--- /dev/null
+++ b/src/southbridge/amd/cs5536/early_smbus.c
@@ -0,0 +1,213 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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 "cs5536.h"
+
+#define SMBUS_ERROR -1
+#define SMBUS_WAIT_UNTIL_READY_TIMEOUT -2
+#define SMBUS_WAIT_UNTIL_DONE_TIMEOUT  -3
+#define SMBUS_TIMEOUT (1000)
+
+/* initialization for SMBus Controller */
+static void cs5536_enable_smbus(void)
+{
+
+	/* Set SCL freq and enable SMB controller */
+	/*outb((0x20 << 1) | SMB_CTRL2_ENABLE, smbus_io_base + SMB_CTRL2); */
+	outb((0x7F << 1) | SMB_CTRL2_ENABLE, SMBUS_IO_BASE + SMB_CTRL2);
+
+	/* Setup SMBus host controller address to 0xEF */
+	outb((0xEF | SMB_ADD_SAEN), SMBUS_IO_BASE + SMB_ADD);
+
+}
+
+static void smbus_delay(void)
+{
+	/* inb(0x80); */
+}
+
+static int smbus_wait(unsigned smbus_io_base)
+{
+	unsigned long loops = SMBUS_TIMEOUT;
+	unsigned char val;
+
+	do {
+		smbus_delay();
+		val = inb(smbus_io_base + SMB_STS);
+		if ((val & SMB_STS_SDAST) != 0)
+			break;
+		if (val & (SMB_STS_BER | SMB_STS_NEGACK)) {
+			/*printk(BIOS_DEBUG, "SMBUS WAIT ERROR %x\n", val); */
+			return SMBUS_ERROR;
+		}
+	} while (--loops);
+	return loops ? 0 : SMBUS_WAIT_UNTIL_READY_TIMEOUT;
+}
+
+/* generate a smbus start condition */
+static int smbus_start_condition(unsigned smbus_io_base)
+{
+	unsigned char val;
+
+	/* issue a START condition */
+	val = inb(smbus_io_base + SMB_CTRL1);
+	outb(val | SMB_CTRL1_START, smbus_io_base + SMB_CTRL1);
+
+	/* check for bus conflict */
+	val = inb(smbus_io_base + SMB_STS);
+	if ((val & SMB_STS_BER) != 0)
+		return SMBUS_ERROR;
+
+	return smbus_wait(smbus_io_base);
+}
+
+static int smbus_check_stop_condition(unsigned smbus_io_base)
+{
+	unsigned char val;
+	unsigned long loops;
+	loops = SMBUS_TIMEOUT;
+	/* check for SDA status */
+	do {
+		smbus_delay();
+		val = inb(smbus_io_base + SMB_CTRL1);
+		if ((val & SMB_CTRL1_STOP) == 0) {
+			break;
+		}
+		outb((0x7F << 1) | SMB_CTRL2_ENABLE, smbus_io_base + SMB_CTRL2);
+	} while (--loops);
+	return loops ? 0 : SMBUS_WAIT_UNTIL_READY_TIMEOUT;
+}
+
+static int smbus_stop_condition(unsigned smbus_io_base)
+{
+	outb(SMB_CTRL1_STOP, smbus_io_base + SMB_CTRL1);
+	return smbus_wait(smbus_io_base);
+}
+
+static int smbus_ack(unsigned smbus_io_base, int state)
+{
+	unsigned char val = inb(smbus_io_base + SMB_CTRL1);
+
+/*	if (state) */
+	outb(val | SMB_CTRL1_ACK, smbus_io_base + SMB_CTRL1);
+/*	else
+		outb(val & ~SMB_CTRL1_ACK, smbus_io_base + SMB_CTRL1);
+*/
+	return 0;
+}
+
+static int smbus_send_slave_address(unsigned smbus_io_base,
+				    unsigned char device)
+{
+	unsigned char val;
+
+	/* send the slave address */
+	outb(device, smbus_io_base + SMB_SDA);
+
+	/* check for bus conflict and NACK */
+	val = inb(smbus_io_base + SMB_STS);
+	if (((val & SMB_STS_BER) != 0) || ((val & SMB_STS_NEGACK) != 0)) {
+		/* printk(BIOS_DEBUG, "SEND SLAVE ERROR (%x)\n", val); */
+		return SMBUS_ERROR;
+	}
+	return smbus_wait(smbus_io_base);
+}
+
+static int smbus_send_command(unsigned smbus_io_base, unsigned char command)
+{
+	unsigned char val;
+
+	/* send the command */
+	outb(command, smbus_io_base + SMB_SDA);
+
+	/* check for bus conflict and NACK */
+	val = inb(smbus_io_base + SMB_STS);
+	if (((val & SMB_STS_BER) != 0) || ((val & SMB_STS_NEGACK) != 0))
+		return SMBUS_ERROR;
+
+	return smbus_wait(smbus_io_base);
+}
+
+static unsigned char smbus_get_result(unsigned smbus_io_base)
+{
+	return inb(smbus_io_base + SMB_SDA);
+}
+
+static unsigned char do_smbus_read_byte(unsigned smbus_io_base,
+					unsigned char device,
+					unsigned char address)
+{
+	unsigned char error = 0;
+
+	if ((smbus_check_stop_condition(smbus_io_base))) {
+		error = 1;
+		goto err;
+	}
+
+	if ((smbus_start_condition(smbus_io_base))) {
+		error = 2;
+		goto err;
+	}
+
+	if ((smbus_send_slave_address(smbus_io_base, device << 1))) {
+		error = 3;
+		goto err;
+	}
+
+	smbus_ack(smbus_io_base, 1);
+
+	if ((smbus_send_command(smbus_io_base, address))) {
+		error = 4;
+		goto err;
+	}
+
+	if ((smbus_start_condition(smbus_io_base))) {
+		error = 5;
+		goto err;
+	}
+
+	if ((smbus_send_slave_address(smbus_io_base, (device << 1) | 0x01))) {
+		error = 6;
+		goto err;
+	}
+
+	if ((smbus_stop_condition(smbus_io_base))) {
+		error = 7;
+		goto err;
+	}
+
+	return smbus_get_result(smbus_io_base);
+
+      err:
+	print_debug("SMBUS READ ERROR:");
+	print_debug_hex8(error);
+	print_debug(" device:");
+	print_debug_hex8(device);
+	print_debug("\n");
+	/* stop, clean up the error, and leave */
+	smbus_stop_condition(smbus_io_base);
+	outb(inb(smbus_io_base + SMB_STS), smbus_io_base + SMB_STS);
+	outb(0x0, smbus_io_base + SMB_STS);
+	return 0xFF;
+}
+
+static inline int smbus_read_byte(unsigned device, unsigned address)
+{
+	return do_smbus_read_byte(SMBUS_IO_BASE, device, address);
+}