| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2012 Google Inc. All rights reserved. |
| * |
| * 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. |
| */ |
| |
| #include <arch/io.h> |
| #include <console/console.h> |
| #include <device/pci_ids.h> |
| #include <device/pci_def.h> |
| #include <delay.h> |
| #include "pch.h" |
| |
| #define SPI_DELAY 10 /* 10us */ |
| #define SPI_RETRY 200000 /* 2s */ |
| |
| static int early_spi_read_block(u32 offset, u8 size, u8 *buffer) |
| { |
| u32 *ptr32 = (u32*)buffer; |
| u32 i; |
| |
| /* Clear status bits */ |
| RCBA16(SPIBAR_HSFS) |= SPIBAR_HSFS_AEL | SPIBAR_HSFS_FCERR | |
| SPIBAR_HSFS_FDONE; |
| |
| if (RCBA16(SPIBAR_HSFS) & SPIBAR_HSFS_SCIP) { |
| printk(BIOS_ERR, "SPI ERROR: transaction in progress\n"); |
| return -1; |
| } |
| |
| /* Set flash address */ |
| RCBA32(SPIBAR_FADDR) = offset; |
| |
| /* Setup read transaction */ |
| RCBA16(SPIBAR_HSFC) = SPIBAR_HSFC_BYTE_COUNT(size) | |
| SPIBAR_HSFC_CYCLE_READ; |
| |
| /* Start transactinon */ |
| RCBA16(SPIBAR_HSFC) |= SPIBAR_HSFC_GO; |
| |
| /* Wait for completion */ |
| for (i = 0; i < SPI_RETRY; i++) { |
| if (RCBA16(SPIBAR_HSFS) & SPIBAR_HSFS_SCIP) { |
| /* Cycle in progress, wait 1ms */ |
| udelay(SPI_DELAY); |
| continue; |
| } |
| |
| if (RCBA16(SPIBAR_HSFS) & SPIBAR_HSFS_AEL) { |
| printk(BIOS_ERR, "SPI ERROR: Access Error\n"); |
| return -1; |
| |
| } |
| |
| if (RCBA16(SPIBAR_HSFS) & SPIBAR_HSFS_FCERR) { |
| printk(BIOS_ERR, "SPI ERROR: Flash Cycle Error\n"); |
| return -1; |
| } |
| break; |
| } |
| |
| if (i >= SPI_RETRY) { |
| printk(BIOS_ERR, "SPI ERROR: Timeout\n"); |
| return -1; |
| } |
| |
| /* Read the data */ |
| for (i = 0; i < size; i+=sizeof(u32)) { |
| if (size-i >= 4) { |
| /* reading >= dword */ |
| *ptr32++ = RCBA32(SPIBAR_FDATA(i/sizeof(u32))); |
| } else { |
| /* reading < dword */ |
| u8 j, *ptr8 = (u8*)ptr32; |
| u32 temp = RCBA32(SPIBAR_FDATA(i/sizeof(u32))); |
| for (j = 0; j < (size-i); j++) { |
| *ptr8++ = temp & 0xff; |
| temp >>= 8; |
| } |
| } |
| } |
| |
| return size; |
| } |
| |
| int early_spi_read(u32 offset, u32 size, u8 *buffer) |
| { |
| u32 current = 0; |
| |
| while (size > 0) { |
| u8 count = (size < 64) ? size : 64; |
| if (early_spi_read_block(offset + current, count, |
| buffer + current) < 0) |
| return -1; |
| size -= count; |
| current += count; |
| } |
| |
| return 0; |
| } |