| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2009 One Laptop per Child, Association, 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_ids.h> |
| #include "vx800.h" |
| |
| #define SMBUS_IO_BASE 0x0500 //from award bios |
| #define PMIO_BASE VX800_ACPI_IO_BASE //might as well set this while we're here |
| |
| #define SMBHSTSTAT SMBUS_IO_BASE + 0x0 |
| #define SMBSLVSTAT SMBUS_IO_BASE + 0x1 |
| #define SMBHSTCTL SMBUS_IO_BASE + 0x2 |
| #define SMBHSTCMD SMBUS_IO_BASE + 0x3 |
| #define SMBXMITADD SMBUS_IO_BASE + 0x4 |
| #define SMBHSTDAT0 SMBUS_IO_BASE + 0x5 |
| #define SMBHSTDAT1 SMBUS_IO_BASE + 0x6 |
| /* Rest of these aren't currently used... */ |
| #define SMBBLKDAT SMBUS_IO_BASE + 0x7 |
| #define SMBSLVCTL SMBUS_IO_BASE + 0x8 |
| #define SMBTRNSADD SMBUS_IO_BASE + 0x9 |
| #define SMBSLVDATA SMBUS_IO_BASE + 0xa |
| #define SMLINK_PIN_CTL SMBUS_IO_BASE + 0xe |
| #define SMBUS_PIN_CTL SMBUS_IO_BASE + 0xf |
| |
| /* Define register settings */ |
| #define HOST_RESET 0xff |
| #define READ_CMD 0x01 // 1 in the 0 bit of SMBHSTADD states to READ |
| |
| #define SMBUS_TIMEOUT (100*1000*10) |
| |
| #define I2C_TRANS_CMD 0x40 |
| #define CLOCK_SLAVE_ADDRESS 0x69 |
| |
| #define SMBUS_DELAY() outb(0x80, 0x80) |
| |
| #ifdef CONFIG_DEBUG_SMBUS |
| #define PRINT_DEBUG(x) print_debug(x) |
| #define PRINT_DEBUG_HEX16(x) print_debug_hex16(x) |
| #else |
| #define PRINT_DEBUG(x) |
| #define PRINT_DEBUG_HEX16(x) |
| #endif |
| |
| /* Internal functions */ |
| static void smbus_print_error(unsigned char host_status_register, int loops) |
| { |
| // print_err("some i2c error\n"); |
| /* Check if there actually was an error */ |
| if (host_status_register == 0x00 || host_status_register == 0x40 || |
| host_status_register == 0x42) |
| return; |
| print_err("smbus_error: "); |
| print_err_hex8(host_status_register); |
| print_err("\n"); |
| if (loops >= SMBUS_TIMEOUT) { |
| print_err("SMBus Timout\n"); |
| } |
| if (host_status_register & (1 << 4)) { |
| print_err("Interrup/SMI# was Failed Bus Transaction\n"); |
| } |
| if (host_status_register & (1 << 3)) { |
| print_err("Bus Error\n"); |
| } |
| if (host_status_register & (1 << 2)) { |
| print_err("Device Error\n"); |
| } |
| if (host_status_register & (1 << 1)) { |
| /* This isn't a real error... */ |
| print_debug("Interrupt/SMI# was Successful Completion\n"); |
| } |
| if (host_status_register & (1 << 0)) { |
| print_err("Host Busy\n"); |
| } |
| } |
| |
| static void smbus_wait_until_ready(void) |
| { |
| int loops; |
| |
| loops = 0; |
| /* Yes, this is a mess, but it's the easiest way to do it */ |
| while (((inb(SMBHSTSTAT) & 1) == 1) && (loops <= SMBUS_TIMEOUT)) { |
| SMBUS_DELAY(); |
| ++loops; |
| } |
| smbus_print_error(inb(SMBHSTSTAT), loops); |
| } |
| |
| static void smbus_reset(void) |
| { |
| outb(HOST_RESET, SMBHSTSTAT); |
| } |
| |
| /* Public functions */ |
| |
| static unsigned int get_spd_data(unsigned int dimm, unsigned int offset) |
| { |
| unsigned int val; |
| |
| smbus_reset(); |
| /* clear host data port */ |
| outb(0x00, SMBHSTDAT0); |
| SMBUS_DELAY(); |
| smbus_wait_until_ready(); |
| |
| /* Do some mathmatic magic */ |
| dimm = (DIMM0 + dimm) << 1; |
| |
| outb(dimm | 0x1, SMBXMITADD); |
| outb(offset, SMBHSTCMD); |
| outb(0x48, SMBHSTCTL); |
| |
| SMBUS_DELAY(); |
| |
| smbus_wait_until_ready(); |
| |
| val = inb(SMBHSTDAT0); |
| smbus_reset(); |
| return val; |
| } |
| |
| void enable_smbus(void) |
| { |
| device_t dev; |
| |
| dev = pci_locate_device(PCI_ID(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855_LPC), 0); |
| |
| if (dev == PCI_DEV_INVALID) { |
| /* This won't display text if enable_smbus() is before serial init */ |
| die("Power Managment Controller not found\n"); |
| } |
| |
| /* Set clock source */ |
| pci_write_config8(dev, 0x94, 0x20); |
| |
| /* Write SMBus IO base to 0xd0, and enable SMBus */ |
| pci_write_config16(dev, 0xd0, SMBUS_IO_BASE | 1); |
| |
| /* Set to Award value */ |
| pci_write_config8(dev, 0xd2, 0x05); |
| |
| /* Make it work for I/O ... */ |
| pci_write_config16(dev, 0x04, 0x0003); |
| |
| smbus_reset(); |
| /* clear host data port */ |
| outb(0x00, SMBHSTDAT0); |
| SMBUS_DELAY(); |
| smbus_wait_until_ready(); |
| } |
| |
| /** |
| * A fixup for some systems that need time for the SMBus to "warm up". This is |
| * needed on some VT823x based systems, where the SMBus spurts out bad data for |
| * a short time after power on. This has been seen on the VIA Epia series and |
| * Jetway J7F2-series. It reads the ID byte from SMBus, looking for |
| * known-good data from a slot/address. Exits on either good data or a timeout. |
| * |
| * TODO: This should probably go into some global file, but one would need to |
| * be created just for it. If some other chip needs/wants it, we can |
| * worry about it then. |
| * |
| * @param mem_ctrl The memory controller and SMBus addresses. |
| */ |
| void smbus_fixup(const struct mem_controller *mem_ctrl) |
| { |
| int i, ram_slots, current_slot = 0; |
| u8 result = 0; |
| |
| ram_slots = ARRAY_SIZE(mem_ctrl->channel0); |
| if (!ram_slots) { |
| print_err("smbus_fixup() thinks there are no RAM slots!\n"); |
| return; |
| } |
| |
| PRINT_DEBUG("Waiting for SMBus to warm up"); |
| |
| /* |
| * Bad SPD data should be either 0 or 0xff, but YMMV. So we look for |
| * the ID bytes of SDRAM, DDR, DDR2, and DDR3 (and anything in between). |
| * VT8237R has only been seen on DDR and DDR2 based systems, so far. |
| */ |
| for (i = 0; (i < SMBUS_TIMEOUT && ((result < SPD_MEMORY_TYPE_SDRAM) || |
| (result > |
| SPD_MEMORY_TYPE_SDRAM_DDR3))); |
| i++) { |
| |
| if (current_slot > ram_slots) |
| current_slot = 0; |
| |
| result = get_spd_data(mem_ctrl->channel0[current_slot], |
| SPD_MEMORY_TYPE); |
| current_slot++; |
| PRINT_DEBUG("."); |
| } |
| |
| if (i >= SMBUS_TIMEOUT) |
| print_err("SMBus timed out while warming up\n"); |
| else |
| PRINT_DEBUG("Done\n"); |
| } |
| |
| /* Debugging Function */ |
| #if CONFIG_DEBUG_SMBUS |
| static void dump_spd_data(void) |
| { |
| int dimm, offset, regs; |
| unsigned int val; |
| |
| for (dimm = 0; dimm < 8; dimm++) { |
| print_debug("SPD Data for DIMM "); |
| print_debug_hex8(dimm); |
| print_debug("\n"); |
| |
| val = get_spd_data(dimm, 0); |
| if (val == 0xff) { |
| regs = 256; |
| } else if (val == 0x80) { |
| regs = 128; |
| } else { |
| print_debug("No DIMM present\n"); |
| regs = 0; |
| } |
| for (offset = 0; offset < regs; offset++) { |
| print_debug(" Offset "); |
| print_debug_hex8(offset); |
| print_debug(" = 0x"); |
| print_debug_hex8(get_spd_data(dimm, offset)); |
| print_debug("\n"); |
| } |
| } |
| } |
| #else |
| #define dump_spd_data() |
| #endif |