diff options
Diffstat (limited to 'src/southbridge/amd/cimx/sb700')
| -rw-r--r-- | src/southbridge/amd/cimx/sb700/Makefile.inc | 2 | ||||
| -rw-r--r-- | src/southbridge/amd/cimx/sb700/smbus_spd.c | 164 | ||||
| -rw-r--r-- | src/southbridge/amd/cimx/sb700/smbus_spd.h | 65 |
3 files changed, 230 insertions, 1 deletions
diff --git a/src/southbridge/amd/cimx/sb700/Makefile.inc b/src/southbridge/amd/cimx/sb700/Makefile.inc index ff96ca6a53..7e878e3690 100644 --- a/src/southbridge/amd/cimx/sb700/Makefile.inc +++ b/src/southbridge/amd/cimx/sb700/Makefile.inc @@ -21,7 +21,7 @@ # SB700 Platform Files romstage-y += early.c -romstage-y += smbus.c +romstage-y += smbus.c smbus_spd.c romstage-y += reset.c ramstage-y += late.c diff --git a/src/southbridge/amd/cimx/sb700/smbus_spd.c b/src/southbridge/amd/cimx/sb700/smbus_spd.c new file mode 100644 index 0000000000..5e3e6894b9 --- /dev/null +++ b/src/southbridge/amd/cimx/sb700/smbus_spd.c @@ -0,0 +1,164 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2012 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 <device/pci_def.h> +#include <device/device.h> +#include <stdlib.h> +#include "OEM.h" /* SMBUS0_BASE_ADDRESS */ + +/* warning: Porting.h includes an open #pragma pack(1) */ +#include "Porting.h" +#include "AGESA.h" +#include "amdlib.h" +#include "chip.h" +#include "smbus_spd.h" + +#include <northbridge/amd/agesa/dimmSpd.h> + +/* uncomment for source level debug - GDB gets really confused otherwise. */ +//#pragma optimize ("", off) + +/** + * Read a single SPD byte. If the first byte is being read, set up the + * address and offset. Following bytes auto increment. + */ +static UINT8 readSmbusByte(UINT16 iobase, UINT8 address, char *buffer, + int offset, int initial_offset) +{ + unsigned int status = -1; + UINT64 time_limit; + + /* clear status register */ + __outbyte(iobase + SMBUS_STATUS_REG, 0xFF); + __outbyte(iobase + SMBUS_SLAVE_STATUS_REG, 0x1F); + + if (offset == initial_offset) { + /* Set offset, set slave address and start reading */ + __outbyte(iobase + SMBUS_CONTROL_REG, offset); + __outbyte(iobase + SMBUS_HOST_CMD_REG, address | READ_BIT); + __outbyte(iobase + SMBUS_COMMAND_REG, SMBUS_READ_BYTE_COMMAND); + } else { + /* Issue read command - auto increments to next byte */ + __outbyte(iobase + SMBUS_COMMAND_REG, SMBUS_READ_COMMAND); + } + /* time limit to avoid hanging for unexpected error status */ + time_limit = __rdtsc() + MAX_READ_TSC_COUNT; + while (__rdtsc() <= time_limit) { + status = __inbyte(iobase + SMBUS_STATUS_REG); + if ((status & SMBUS_INTERRUPT_MASK) == 0) + continue; /* SMBusInterrupt not set, keep waiting */ + if ((status & HOSTBUSY_MASK) != 0) + continue; /* HostBusy set, keep waiting */ + break; + } + + if (status != STATUS__COMPLETED_SUCCESSFULLY) + return AGESA_ERROR; + + buffer[0] = __inbyte(iobase + SMBUS_DATA0_REG); + return AGESA_SUCCESS; +} + +/** + * Write a single smbus byte. + */ +UINT8 writeSmbusByte(UINT16 iobase, UINT8 address, UINT8 buffer, + int offset) +{ + unsigned int status = -1; + UINT64 time_limit; + + /* clear status register */ + __outbyte(iobase + SMBUS_STATUS_REG, 0xFF); + __outbyte(iobase + SMBUS_SLAVE_STATUS_REG, 0x1F); + + /* set offset, set slave address, set data and start writing */ + __outbyte(iobase + SMBUS_CONTROL_REG, offset); + __outbyte(iobase + SMBUS_HOST_CMD_REG, address & (~READ_BIT)); + __outbyte(iobase + SMBUS_DATA0_REG, buffer); + __outbyte(iobase + SMBUS_COMMAND_REG, SMBUS_WRITE_BYTE_COMMAND); + + /* time limit to avoid hanging for unexpected error status */ + time_limit = __rdtsc() + MAX_READ_TSC_COUNT; + while (__rdtsc() <= time_limit) { + status = __inbyte(iobase + SMBUS_STATUS_REG); + if ((status & SMBUS_INTERRUPT_MASK) == 0) + continue; /* SMBusInterrupt not set, keep waiting */ + if ((status & HOSTBUSY_MASK) != 0) + continue; /* HostBusy set, keep waiting */ + break; + } + + if (status != STATUS__COMPLETED_SUCCESSFULLY) + return AGESA_ERROR; + + return AGESA_SUCCESS; +} + +static void setupFch(UINT16 ioBase) +{ + AMD_CONFIG_PARAMS StdHeader; + UINT32 PciData32; + UINT8 PciData8; + PCI_ADDR PciAddress; + + /* Set SMBus MMIO. */ + PciAddress.AddressValue = MAKE_SBDFO (0, 0, 20, 0, 0x90); + PciData32 = (ioBase & 0xFFFFFFF0) | BIT0; + LibAmdPciWrite(AccessWidth32, PciAddress, &PciData32, &StdHeader); + + /* Enable SMBus MMIO. */ + PciAddress.AddressValue = MAKE_SBDFO (0, 0, 20, 0, 0xD2); + LibAmdPciRead(AccessWidth8, PciAddress, &PciData8, &StdHeader); ; + PciData8 |= BIT0; + LibAmdPciWrite(AccessWidth8, PciAddress, &PciData8, &StdHeader); + + /* Set SMBus clock to 400 KHz */ + __outbyte(ioBase + SMBUS_CLOCK_REG, SMBUS_FREQUENCY_CONST / 400000); +} + +/** + * Read one or more SPD bytes from a DIMM. + * Start with offset zero and read sequentially. + * Reads 128 bytes in 7-8 ms at 400 KHz. + */ +static UINT8 readspd(UINT16 iobase, UINT8 SmbusSlaveAddress, char *buffer, + UINT16 count) +{ + UINT16 index; + UINT8 status; + UINT8 initial_offset = 0; + + setupFch(iobase); + + for (index = initial_offset; index < count; index++) { + status = readSmbusByte(iobase, SmbusSlaveAddress, &buffer[index], index, + initial_offset); + if (status != AGESA_SUCCESS) + return status; + } + + return status; +} + +int smbus_readSpd(int spdAddress, char *buf, size_t len) +{ + int ioBase = SMBUS0_BASE_ADDRESS; + setupFch (ioBase); + return readspd (ioBase, spdAddress, buf, len); +} diff --git a/src/southbridge/amd/cimx/sb700/smbus_spd.h b/src/southbridge/amd/cimx/sb700/smbus_spd.h new file mode 100644 index 0000000000..107c79fb5b --- /dev/null +++ b/src/southbridge/amd/cimx/sb700/smbus_spd.h @@ -0,0 +1,65 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 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, MA02110-1301 USA + */ + +#ifndef _SMBUS_SPD_H_ +#define _SMBUS_SPD_H_ + +#define READ_BIT 0x01 + +#define SMBUS_INTERRUPT_MASK 0x02 +#define HOSTBUSY_MASK 0x01 + +#define SMBUS_READ_BYTE_COMMAND 0x48 +#define SMBUS_READ_COMMAND 0x44 + +#define SMBUS_WRITE_BYTE_COMMAND 0x48 + +#define MAX_READ_TSC_COUNT (2000000000 / 10) + +#define PMIO_INDEX_REG 0xCD6 +#define PMIO_DATA_REG 0xCD7 + +#define SMBUS_BAR_LOW_BYTE 0x2C +#define SMBUS_BAR_HIGH_BYTE 0x2D + +#define SMBUS_STATUS_REG 0x00 +#define SMBUS_SLAVE_STATUS_REG 0x01 +#define SMBUS_COMMAND_REG 0x02 +#define SMBUS_CONTROL_REG 0x03 +#define SMBUS_HOST_CMD_REG 0x04 +#define SMBUS_DATA0_REG 0x05 +#define SMBUS_CLOCK_REG 0x0E + +#define STATUS__COMPLETED_SUCCESSFULLY 0x02 + +#define SMBUS_FREQUENCY_CONST 66000000 / 4 + +/* + * This function prototype is only used by the AMD Dinar mainboard. The SMBus + * write is used to select which socket's SPD will be read by the subsequent + * SPD read call. This function is being placed in the F15 wrapper code with + * the other SPD read functions because the next step of the SPD read clean-up + * will be to move the SMBus read/write functions into the southbridge to make + * them more generic. Having the writeSmbusByte() function in the same file as + * the readSmbusByte() function will ensure that the writeSmbusByte() function + * is not overlooked. + */ +UINT8 writeSmbusByte(UINT16 iobase, UINT8 address, UINT8 buffer, int offset); + +#endif |