55d0f40734
Signed-off-by: Elyes Haouas <ehaouas@noos.fr> Change-Id: Ibe20d48bdd8c776f9658620a13814f96e564dabc Reviewed-on: https://review.coreboot.org/c/coreboot/+/65907 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <amdblocks/agesawrapper.h>
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#include <amdblocks/acpimmio.h>
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#include <console/console.h>
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#include <device/pci_def.h>
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#include <device/device.h>
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#include <device/smbus_host.h>
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#include <soc/southbridge.h>
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#include <amdblocks/dimm_spd.h>
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/*
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* readspd - Read one or more SPD bytes from a DIMM.
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* Start with offset zero and read sequentially.
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* Optimization relies on autoincrement to avoid
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* sending offset for every byte.
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* Reads 128 bytes in 7-8 ms at 400 KHz.
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*/
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static int readspd(uint8_t SmbusSlaveAddress, char *buffer, size_t count)
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{
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uint8_t dev_addr;
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size_t index;
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int error;
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char *pbuf = buffer;
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printk(BIOS_SPEW, "-------------READING SPD-----------\n");
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printk(BIOS_SPEW, "SmbusSlave: 0x%08X, count: %zd\n",
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SmbusSlaveAddress, count);
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/*
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* Convert received device address to the format accepted by
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* do_smbus_read_byte and do_smbus_recv_byte.
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*/
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dev_addr = (SmbusSlaveAddress >> 1);
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/* Read the first SPD byte */
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error = do_smbus_read_byte((uintptr_t)acpimmio_smbus, dev_addr, 0);
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if (error < 0) {
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printk(BIOS_ERR, "-------------SPD READ ERROR-----------\n");
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return error;
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}
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*pbuf = (char)error;
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pbuf++;
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/* Read the remaining SPD bytes using do_smbus_recv_byte for speed */
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for (index = 1 ; index < count ; index++) {
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error = do_smbus_recv_byte((uintptr_t)acpimmio_smbus, dev_addr);
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if (error < 0) {
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printk(BIOS_ERR, "-------------SPD READ ERROR-----------\n");
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return error;
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}
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*pbuf = (char)error;
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pbuf++;
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}
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printk(BIOS_SPEW, "\n");
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printk(BIOS_SPEW, "-------------FINISHED READING SPD-----------\n");
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return 0;
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}
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int sb_read_spd(uint8_t spdAddress, char *buf, size_t len)
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{
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return readspd(spdAddress, buf, len);
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}
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