Re: [coreboot] SB600 SPI Driver for Flashrom (unfinished)

[Corey Osgood]

Thanks for your contribution! I know nothing about sb600, so I'll leave code
review to those who know, but for the patch itself, we need a sign-off
before we can commit any patches, see this:
http://www.coreboot.org/Development_Guidelines#Sign-off_Procedure Please
repost with your sign off, I assume this applies to your other patch too.

Thanks!
Corey

2008/10/15 Sean Nelson
> 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
> 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;
>
> +}