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Diffstat (limited to 'src/southbridge/amd/cimx_wrapper/sb800/smbus.c')
-rw-r--r--src/southbridge/amd/cimx_wrapper/sb800/smbus.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/src/southbridge/amd/cimx_wrapper/sb800/smbus.c b/src/southbridge/amd/cimx_wrapper/sb800/smbus.c
new file mode 100644
index 0000000000..6599cafc30
--- /dev/null
+++ b/src/southbridge/amd/cimx_wrapper/sb800/smbus.c
@@ -0,0 +1,249 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2010 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 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 <arch/io.h>
+#include <southbridge/amd/cimx_wrapper/sb800/smbus.h>
+
+static inline void smbus_delay(void)
+{
+ outb(inb(0x80), 0x80);
+}
+
+static int smbus_wait_until_ready(u32 smbus_io_base)
+{
+ u32 loops;
+
+ loops = SMBUS_TIMEOUT;
+ do {
+ u8 val;
+ val = inb(smbus_io_base + SMBHSTSTAT);
+ val &= 0x1f;
+ if (val == 0) { /* ready now */
+ return 0;
+ }
+ outb(val, smbus_io_base + SMBHSTSTAT);
+ } while (--loops);
+
+ return -2; /* time out */
+}
+
+static int smbus_wait_until_done(u32 smbus_io_base)
+{
+ u32 loops;
+
+ loops = SMBUS_TIMEOUT;
+ do {
+ u8 val;
+
+ val = inb(smbus_io_base + SMBHSTSTAT);
+ val &= 0x1f; /* mask off reserved bits */
+ if (val & 0x1c) {
+ return -5; /* error */
+ }
+ if (val == 0x02) {
+ outb(val, smbus_io_base + SMBHSTSTAT); /* clear status */
+ return 0;
+ }
+ } while (--loops);
+
+ return -3; /* timeout */
+}
+
+int do_smbus_recv_byte(u32 smbus_io_base, u32 device)
+{
+ u8 byte;
+
+ if (smbus_wait_until_ready(smbus_io_base) < 0) {
+ return -2; /* not ready */
+ }
+
+ /* set the device I'm talking too */
+ outb(((device & 0x7f) << 1) | 1, smbus_io_base + SMBHSTADDR);
+
+ byte = inb(smbus_io_base + SMBHSTCTRL);
+ byte &= 0xe3; /* Clear [4:2] */
+ byte |= (1 << 2) | (1 << 6); /* Byte data read/write command, start the command */
+ outb(byte, smbus_io_base + SMBHSTCTRL);
+
+ /* poll for transaction completion */
+ if (smbus_wait_until_done(smbus_io_base) < 0) {
+ return -3; /* timeout or error */
+ }
+
+ /* read results of transaction */
+ byte = inb(smbus_io_base + SMBHSTCMD);
+
+ return byte;
+}
+
+int do_smbus_send_byte(u32 smbus_io_base, u32 device, u8 val)
+{
+ u8 byte;
+
+ if (smbus_wait_until_ready(smbus_io_base) < 0) {
+ return -2; /* not ready */
+ }
+
+ /* set the command... */
+ outb(val, smbus_io_base + SMBHSTCMD);
+
+ /* set the device I'm talking too */
+ outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBHSTADDR);
+
+ byte = inb(smbus_io_base + SMBHSTCTRL);
+ byte &= 0xe3; /* Clear [4:2] */
+ byte |= (1 << 2) | (1 << 6); /* Byte data read/write command, start the command */
+ outb(byte, smbus_io_base + SMBHSTCTRL);
+
+ /* poll for transaction completion */
+ if (smbus_wait_until_done(smbus_io_base) < 0) {
+ return -3; /* timeout or error */
+ }
+
+ return 0;
+}
+
+int do_smbus_read_byte(u32 smbus_io_base, u32 device, u32 address)
+{
+ u8 byte;
+
+ if (smbus_wait_until_ready(smbus_io_base) < 0) {
+ return -2; /* not ready */
+ }
+
+ /* set the command/address... */
+ outb(address & 0xff, smbus_io_base + SMBHSTCMD);
+
+ /* set the device I'm talking too */
+ outb(((device & 0x7f) << 1) | 1, smbus_io_base + SMBHSTADDR);
+
+ byte = inb(smbus_io_base + SMBHSTCTRL);
+ byte &= 0xe3; /* Clear [4:2] */
+ byte |= (1 << 3) | (1 << 6); /* Byte data read/write command, start the command */
+ outb(byte, smbus_io_base + SMBHSTCTRL);
+
+ /* poll for transaction completion */
+ if (smbus_wait_until_done(smbus_io_base) < 0) {
+ return -3; /* timeout or error */
+ }
+
+ /* read results of transaction */
+ byte = inb(smbus_io_base + SMBHSTDAT0);
+
+ return byte;
+}
+
+int do_smbus_write_byte(u32 smbus_io_base, u32 device, u32 address, u8 val)
+{
+ u8 byte;
+
+ if (smbus_wait_until_ready(smbus_io_base) < 0) {
+ return -2; /* not ready */
+ }
+
+ /* set the command/address... */
+ outb(address & 0xff, smbus_io_base + SMBHSTCMD);
+
+ /* set the device I'm talking too */
+ outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBHSTADDR);
+
+ /* output value */
+ outb(val, smbus_io_base + SMBHSTDAT0);
+
+ byte = inb(smbus_io_base + SMBHSTCTRL);
+ byte &= 0xe3; /* Clear [4:2] */
+ byte |= (1 << 3) | (1 << 6); /* Byte data read/write command, start the command */
+ outb(byte, smbus_io_base + SMBHSTCTRL);
+
+ /* poll for transaction completion */
+ if (smbus_wait_until_done(smbus_io_base) < 0) {
+ return -3; /* timeout or error */
+ }
+
+ return 0;
+}
+
+void alink_ab_indx(u32 reg_space, u32 reg_addr, u32 mask, u32 val)
+{
+ u32 tmp;
+
+ outl((reg_space & 0x7) << 29 | reg_addr, AB_INDX);
+ tmp = inl(AB_DATA);
+ /* rpr 4.2
+ * For certain revisions of the chip, the ABCFG registers,
+ * with an address of 0x100NN (where 'N' is any hexadecimal
+ * number), require an extra programming step.*/
+ outl(0, AB_INDX);
+
+ tmp &= ~mask;
+ tmp |= val;
+
+ /* printk(BIOS_DEBUG, "about write %x, index=%x", tmp, (reg_space&0x3)<<29 | reg_addr); */
+ outl((reg_space & 0x7) << 29 | reg_addr, AB_INDX); /* probably we dont have to do it again. */
+ outl(tmp, AB_DATA);
+ outl(0, AB_INDX);
+}
+
+void alink_rc_indx(u32 reg_space, u32 reg_addr, u32 port, u32 mask, u32 val)
+{
+ u32 tmp;
+
+ outl((reg_space & 0x7) << 29 | (port & 3) << 24 | reg_addr, AB_INDX);
+ tmp = inl(AB_DATA);
+ /* rpr 4.2
+ * For certain revisions of the chip, the ABCFG registers,
+ * with an address of 0x100NN (where 'N' is any hexadecimal
+ * number), require an extra programming step.*/
+ outl(0, AB_INDX);
+
+ tmp &= ~mask;
+ tmp |= val;
+
+ //printk(BIOS_DEBUG, "about write %x, index=%x", tmp, (reg_space&0x3)<<29 | (port&3) << 24 | reg_addr);
+ outl((reg_space & 0x7) << 29 | (port & 3) << 24 | reg_addr, AB_INDX); /* probably we dont have to do it again. */
+ outl(tmp, AB_DATA);
+ outl(0, AB_INDX);
+}
+
+/* space = 0: AX_INDXC, AX_DATAC
+ * space = 1: AX_INDXP, AX_DATAP
+ */
+void alink_ax_indx(u32 space /*c or p? */ , u32 axindc, u32 mask, u32 val)
+{
+ u32 tmp;
+
+ /* read axindc to tmp */
+ outl(space << 29 | space << 3 | 0x30, AB_INDX);
+ outl(axindc, AB_DATA);
+ outl(0, AB_INDX);
+ outl(space << 29 | space << 3 | 0x34, AB_INDX);
+ tmp = inl(AB_DATA);
+ outl(0, AB_INDX);
+
+ tmp &= ~mask;
+ tmp |= val;
+
+ /* write tmp */
+ outl(space << 29 | space << 3 | 0x30, AB_INDX);
+ outl(axindc, AB_DATA);
+ outl(0, AB_INDX);
+ outl(space << 29 | space << 3 | 0x34, AB_INDX);
+ outl(tmp, AB_DATA);
+ outl(0, AB_INDX);
+}
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