diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/southbridge/via/common/early_smbus_delay.c | 28 | ||||
| -rw-r--r-- | src/southbridge/via/common/early_smbus_is_busy.c | 31 | ||||
| -rw-r--r-- | src/southbridge/via/common/early_smbus_print_error.c | 53 | ||||
| -rw-r--r-- | src/southbridge/via/common/early_smbus_read_byte.c | 51 | ||||
| -rw-r--r-- | src/southbridge/via/common/early_smbus_reset.c | 30 | ||||
| -rw-r--r-- | src/southbridge/via/common/early_smbus_wait_until_ready.c | 43 | ||||
| -rw-r--r-- | src/southbridge/via/common/via_early_smbus.h | 56 |
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> |