sb600 spi driver file for flashrom
Index: sb600spi.c =================================================================== --- sb600spi.c (revision 0) +++ sb600spi.c (revision 0) @@ -0,0 +1,126 @@ +/* + * This file is part of the flashrom project. + * + * Copyright (C) 2008 Sean Nelson snelson@nmt.edu + * + * 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 + */ + +/* + * SPI interface for SB600 + */ + +#include <stdio.h> +#include <pci/pci.h> +#include <stdint.h> +#include <string.h> +#include "flash.h" +#include "spi.h" + +uint16_t sb600_flashport = 0; + +/* use fast 33MHz SPI (<>0) or slow 16MHz (0) */ +int fast_spi = 1; + +static uint16_t find_sb600_spi_flash_port(uint16_t device_id) +{ + struct pci_dev *dev; + uint16_t flashport = 0; + + /* sb600's LPC ISA Bridge */ + dev = pci_dev_find(0x1002, device_id); + + /* SPI Base Address (A0h) */ + flashport = pci_read_word(dev, 0xa0); + + return flashport; +} + +int sb600_probe_spi_flash(const char *name) +{ + sb600_flashport = find_ite_spi_flash_port(0x438d); + + if (sb600_flashport) + flashbus = BUS_TYPE_SB600_SPI; + + return (!it8716f_flashport); +} + +int sb600_spi_command(unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr) +{ + uint8_t busy, speed; + int i; + + if (readcnt > 8) { + printf("%s called with unsupported readcnt %i.\n", + __FUNCTION__, readcnt); + return 1; + } + + OUTB(writearr[0], sb600_flashport + 0x00); + for(i=1; i < (writecnt-1); i++) + { + OUTB(writearr[i], sb600_flashport + 0x0c); + } + + /* + * set the SPI clock speed (0x0D) + * NormSpeed: bit 5 & 4 + * FastSpeed: bit 7 & 6 + * + * 33MHz - 01b + * 16.5MHz - 11b + */ + speed = (fast_spi ? 1 : 3)<<6; + speed = (fast_spi ? 1 : 3)<<4; + OUTB(speed, sb600_flashport); + + /* + * set the TxByte and RxBytes (0x01) + * TxByteCount: bit 3-0 + * RxByteCount: bit 7-4 + */ + OUTB(((writecnt-1)<<4)|(readcnt), sb600_flashport) + + /* + * start the command execution (0x02) + * ExecuteOpCode: bit 0; start off the SPI command + * Reserved: bit 1&2 + * SpiArbEnable: bit 3; 0 to speed up SPI ROM Access + */ + OUTB((1<<3)|(1<<0), sb600_flashport); + + if (readcnt > 0) { + for (i = 0; i < readcnt; i++) { + readarr[i] = INB(sb600_flashport + 0x0c); + } + } + + return 0; +} + +int sb600_spi_chip_read(struct flashchip *flash, uint8_t *buf) +{ + int total_size = 1024 * flash->total_size; + memcpy(buf, (const char *)flash->virtual_memory, total_size); + return 0; +} + +int sb600_spi_chip_write(struct flashchip *flash, uint8_t *buf) +{ + int total_size = 1024 * flash->total_size; + memcpy((const char*)flash->virtual_memory, buf, total_size); + return 0; +} +