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-rw-r--r--src/southbridge/via/common/early_smbus_delay.c28
-rw-r--r--src/southbridge/via/common/early_smbus_is_busy.c31
-rw-r--r--src/southbridge/via/common/early_smbus_print_error.c53
-rw-r--r--src/southbridge/via/common/early_smbus_read_byte.c51
-rw-r--r--src/southbridge/via/common/early_smbus_reset.c30
-rw-r--r--src/southbridge/via/common/early_smbus_wait_until_ready.c43
-rw-r--r--src/southbridge/via/common/via_early_smbus.h56
7 files changed, 292 insertions, 0 deletions
diff --git a/src/southbridge/via/common/early_smbus_delay.c b/src/southbridge/via/common/early_smbus_delay.c
new file mode 100644
index 0000000000..77733561d3
--- /dev/null
+++ b/src/southbridge/via/common/early_smbus_delay.c
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011-2013 Alexandru Gagniuc <mr.nuke.me@gmail.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
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "via_early_smbus.h"
+
+/**
+ * \brief Brief delay for SMBus transactions
+ */
+void smbus_delay(void)
+{
+ inb(0x80);
+}
diff --git a/src/southbridge/via/common/early_smbus_is_busy.c b/src/southbridge/via/common/early_smbus_is_busy.c
new file mode 100644
index 0000000000..1462141210
--- /dev/null
+++ b/src/southbridge/via/common/early_smbus_is_busy.c
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.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
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "via_early_smbus.h"
+
+/**
+ * \brief Checks if the SMBus is currently busy with a transaction
+ *
+ * @param smbus_dev The base SMBus IO port
+ */
+int smbus_is_busy(u32 smbus_dev)
+{
+ /* Check if bit 0 of the status register is 1 (busy) or 0 (ready) */
+ return ((inb(SMBHSTSTAT(smbus_dev)) & (1 << 0)) == 1);
+}
diff --git a/src/southbridge/via/common/early_smbus_print_error.c b/src/southbridge/via/common/early_smbus_print_error.c
new file mode 100644
index 0000000000..7b30a71c6e
--- /dev/null
+++ b/src/southbridge/via/common/early_smbus_print_error.c
@@ -0,0 +1,53 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.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
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "via_early_smbus.h"
+#include <console/console.h>
+
+/**
+ * \brief Print an error, should it occur. If no error, just exit.
+ *
+ * @param smbus_dev The base SMBus IO port
+ * @param host_status The data returned on the host status register after
+ * a transaction is processed.
+ * @param loops The number of times a transaction was attempted.
+ * @return 0 if no error occurred
+ * 1 if an error was detected
+ */
+int smbus_print_error(u32 smbus_dev, u8 host_status, int loops)
+{
+ /* Check if there actually was an error. */
+ if ((host_status == 0x00 || host_status == 0x40 ||
+ host_status == 0x42) && (loops < SMBUS_TIMEOUT))
+ return 0;
+
+ if (loops >= SMBUS_TIMEOUT)
+ printsmbus("SMBus timeout\n");
+ if (host_status & (1 << 4))
+ printsmbus("Interrupt/SMI# was Failed Bus Transaction\n");
+ if (host_status & (1 << 3))
+ printsmbus("Bus error\n");
+ if (host_status & (1 << 2))
+ printsmbus("Device error\n");
+ if (host_status & (1 << 1))
+ printsmbus("Interrupt/SMI# completed successfully\n");
+ if (host_status & (1 << 0))
+ printsmbus("Host busy\n");
+ return 1;
+}
diff --git a/src/southbridge/via/common/early_smbus_read_byte.c b/src/southbridge/via/common/early_smbus_read_byte.c
new file mode 100644
index 0000000000..de76ac9175
--- /dev/null
+++ b/src/southbridge/via/common/early_smbus_read_byte.c
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.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
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "via_early_smbus.h"
+
+/**
+ * \brief Read a byte from the SMBus.
+ *
+ * @param smbus_dev The base SMBus IO port
+ * @param addr The address location of the DIMM on the SMBus.
+ * @param offset The offset the data is located at.
+ */
+u8 smbus_read_byte(u32 smbus_dev, u8 addr, u8 offset)
+{
+ u8 val;
+
+ /* Initialize SMBus sequence */
+ smbus_reset(smbus_dev);
+ /* Clear host data port. */
+ outb(0x00, SMBHSTDAT0(smbus_dev));
+
+ smbus_wait_until_ready(smbus_dev);
+
+ /* Actual addr to reg format. */
+ addr = (addr << 1);
+ addr |= 1; /* read command */
+ outb(addr, SMBXMITADD(smbus_dev));
+ outb(offset, SMBHSTCMD(smbus_dev));
+ /* Start transaction, byte data read. */
+ outb(0x48, SMBHSTCTL(smbus_dev));
+ smbus_wait_until_ready(smbus_dev);
+
+ val = inb(SMBHSTDAT0(smbus_dev));
+ return val;
+}
diff --git a/src/southbridge/via/common/early_smbus_reset.c b/src/southbridge/via/common/early_smbus_reset.c
new file mode 100644
index 0000000000..68cdd4f75a
--- /dev/null
+++ b/src/southbridge/via/common/early_smbus_reset.c
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.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
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "via_early_smbus.h"
+
+/**
+ * \brief Clear the SMBus host status register
+ *
+ * @param smbus_dev The base SMBus IO port
+ */
+void smbus_reset(u32 smbus_dev)
+{
+ outb(0xdf, SMBHSTSTAT(smbus_dev));
+}
diff --git a/src/southbridge/via/common/early_smbus_wait_until_ready.c b/src/southbridge/via/common/early_smbus_wait_until_ready.c
new file mode 100644
index 0000000000..dba37ff0cd
--- /dev/null
+++ b/src/southbridge/via/common/early_smbus_wait_until_ready.c
@@ -0,0 +1,43 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.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
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "via_early_smbus.h"
+#include <console/console.h>
+
+/**
+ * \brief Wait for the SMBus to become ready to process a new transaction.
+ *
+ * @param smbus_dev The base SMBus IO port
+ */
+int smbus_wait_until_ready(u32 smbus_dev)
+{
+ int loops;
+
+ printsmbus("Waiting until SMBus ready\n");
+
+ /* Loop up to SMBUS_TIMEOUT times, waiting for bit 0 of the
+ * SMBus Host Status register to go to 0, indicating the operation
+ * was completed successfully. I don't remember why I did it this way,
+ * but I think it was because ROMCC was running low on registers */
+ loops = 0;
+ while (smbus_is_busy(smbus_dev) && loops < SMBUS_TIMEOUT)
+ ++loops;
+
+ return smbus_print_error(smbus_dev, inb(SMBHSTSTAT(smbus_dev)), loops);
+}
diff --git a/src/southbridge/via/common/via_early_smbus.h b/src/southbridge/via/common/via_early_smbus.h
new file mode 100644
index 0000000000..aca920b470
--- /dev/null
+++ b/src/southbridge/via/common/via_early_smbus.h
@@ -0,0 +1,56 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.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
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file via_early_sambus.h
+ *
+ * This file contains generic definitions used in VIA SMBus controllers.
+ *
+ * Functions defined in device/early/smbus.h are each implemented in a separate
+ * early_smbus_[func_name].c file. This makes it possible to override any of
+ * these functions by not including them in yout build, via Makefile.c. This is
+ * useful when there is a need to work around chipset bugs.
+ *
+ * These implementations work with most via chipsets. Any VIA port should try
+ * to use these. Makefile.inc needs to be adapted to link against the files
+ * providing SMBus functionality:
+ * @code
+ * romstage-y += ./../../../southbridge/via/common/early_smbus_func.c
+ * @endcode
+ */
+
+/**
+ * \brief SMBus IO ports in relation to the base IO port
+ */
+#define SMBHSTSTAT(base) ((u16)base + 0x0)
+#define SMBSLVSTAT(base) ((u16)base + 0x1)
+#define SMBHSTCTL(base) ((u16)base + 0x2)
+#define SMBHSTCMD(base) ((u16)base + 0x3)
+#define SMBXMITADD(base) ((u16)base + 0x4)
+#define SMBHSTDAT0(base) ((u16)base + 0x5)
+#define SMBHSTDAT1(base) ((u16)base + 0x6)
+#define SMBBLKDAT(base) ((u16)base + 0x7)
+#define SMBSLVCTL(base) ((u16)base + 0x8)
+#define SMBTRNSADD(base) ((u16)base + 0x9)
+#define SMBSLVDATA (base) ((u16)base + 0xa)
+
+#define SMBUS_TIMEOUT (100*1000*10)
+
+#include <device/early_smbus.h>
+#include <arch/io.h>