| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <amdblocks/agesawrapper.h> |
| #include <console/console.h> |
| #include <device/pci_def.h> |
| #include <device/device.h> |
| #include <device/smbus_host.h> |
| #include <soc/southbridge.h> |
| #include <amdblocks/dimm_spd.h> |
| |
| /* |
| * readspd - Read one or more SPD bytes from a DIMM. |
| * Start with offset zero and read sequentially. |
| * Optimization relies on autoincrement to avoid |
| * sending offset for every byte. |
| * Reads 128 bytes in 7-8 ms at 400 KHz. |
| */ |
| static int readspd(uint8_t SmbusSlaveAddress, char *buffer, size_t count) |
| { |
| uint8_t dev_addr; |
| size_t index; |
| int error; |
| char *pbuf = buffer; |
| |
| printk(BIOS_SPEW, "-------------READING SPD-----------\n"); |
| printk(BIOS_SPEW, "SmbusSlave: 0x%08X, count: %zd\n", |
| SmbusSlaveAddress, count); |
| |
| /* |
| * Convert received device address to the format accepted by |
| * do_smbus_read_byte and do_smbus_recv_byte. |
| */ |
| dev_addr = (SmbusSlaveAddress >> 1); |
| |
| /* Read the first SPD byte */ |
| error = do_smbus_read_byte(ACPIMMIO_SMBUS_BASE, dev_addr, 0); |
| if (error < 0) { |
| printk(BIOS_ERR, "-------------SPD READ ERROR-----------\n"); |
| return error; |
| } |
| *pbuf = (char) error; |
| pbuf++; |
| |
| /* Read the remaining SPD bytes using do_smbus_recv_byte for speed */ |
| for (index = 1 ; index < count ; index++) { |
| error = do_smbus_recv_byte(ACPIMMIO_SMBUS_BASE, dev_addr); |
| if (error < 0) { |
| printk(BIOS_ERR, "-------------SPD READ ERROR-----------\n"); |
| return error; |
| } |
| *pbuf = (char) error; |
| pbuf++; |
| } |
| printk(BIOS_SPEW, "\n"); |
| printk(BIOS_SPEW, "-------------FINISHED READING SPD-----------\n"); |
| |
| return 0; |
| } |
| |
| int sb_read_spd(uint8_t spdAddress, char *buf, size_t len) |
| { |
| return readspd(spdAddress, buf, len); |
| } |