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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 Advanced Micro Devices, Inc.
*
* 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
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <arch/io.h>
#include <spi.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
static u32 spibar;
static void reset_internal_fifo_pointer(void)
{
do {
write8(spibar + 2, read8(spibar + 2) | 0x10);
} while (read8(spibar + 0xD) & 0x7);
}
static void execute_command(void)
{
write8(spibar + 2, read8(spibar + 2) | 1);
while ((read8(spibar + 2) & 1) && (read8(spibar+3) & 0x80));
}
void spi_init()
{
device_t dev;
dev = dev_find_slot(0, PCI_DEVFN(0x14, 3));
spibar = pci_read_config32(dev, 0xA0) & ~0x1F;
}
int spi_xfer(struct spi_slave *slave, const void *dout,
unsigned int bitsout, void *din, unsigned int bitsin)
{
/* First byte is cmd which can not being sent through FIFO. */
u8 cmd = *(u8 *)dout++;
u8 readoffby1;
u8 readwrite;
u8 bytesout, bytesin;
u8 count;
bitsout -= 8;
bytesout = bitsout / 8;
bytesin = bitsin / 8;
readoffby1 = bytesout ? 0 : 1;
readwrite = (bytesin + readoffby1) << 4 | bytesout;
write8(spibar + 1, readwrite);
write8(spibar + 0, cmd);
reset_internal_fifo_pointer();
for (count = 0; count < bytesout; count++, dout++) {
write8(spibar + 0x0C, *(u8 *)dout);
}
reset_internal_fifo_pointer();
execute_command();
reset_internal_fifo_pointer();
/* Skip the bytes we sent. */
for (count = 0; count < bytesout; count++) {
cmd = read8(spibar + 0x0C);
}
reset_internal_fifo_pointer();
for (count = 0; count < bytesin; count++, din++) {
*(u8 *)din = read8(spibar + 0x0C);
}
return 0;
}
int spi_claim_bus(struct spi_slave *slave)
{
return 0;
}
void spi_release_bus(struct spi_slave *slave)
{
}
void spi_cs_activate(struct spi_slave *slave)
{
}
void spi_cs_deactivate(struct spi_slave *slave)
{
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct spi_slave *slave = malloc(sizeof(*slave));
if (!slave) {
return NULL;
}
memset(slave, 0, sizeof(*slave));
return slave;
}
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