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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.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <arch/io.h>
#include <console/console.h>
#include <spi-generic.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#if IS_ENABLED (CONFIG_SB800_IMC_FWM)
#include "SBPLATFORM.h"
#include <vendorcode/amd/cimx/sb800/ECfan.h>
static int bus_claimed = 0;
#endif
#define AMD_SB_SPI_TX_LEN 8
static uintptr_t spibar;
static void reset_internal_fifo_pointer(void)
{
do {
write8((void *)(spibar + 2),
read8((void *)(spibar + 2)) | 0x10);
} while (read8((void *)(spibar + 0xD)) & 0x7);
}
static void execute_command(void)
{
write8((void *)(spibar + 2), read8((void *)(spibar + 2)) | 1);
while ((read8((void *)(spibar + 2)) & 1) &&
(read8((void *)(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;
}
unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len)
{
return min(AMD_SB_SPI_TX_LEN - cmd_len, buf_len);
}
int spi_xfer(struct spi_slave *slave, const void *dout,
unsigned int bytesout, void *din, unsigned int bytesin)
{
/* First byte is cmd which can not being sent through FIFO. */
u8 cmd = *(u8 *)dout++;
u8 readoffby1;
u8 readwrite;
u8 count;
bytesout--;
/*
* Check if this is a write command attempting to transfer more bytes
* than the controller can handle. Iterations for writes are not
* supported here because each SPI write command needs to be preceded
* and followed by other SPI commands, and this sequence is controlled
* by the SPI chip driver.
*/
if (bytesout > AMD_SB_SPI_TX_LEN) {
printk(BIOS_DEBUG, "FCH SPI: Too much to write. Does your SPI chip driver use"
" spi_crop_chunk()?\n");
return -1;
}
readoffby1 = bytesout ? 0 : 1;
readwrite = (bytesin + readoffby1) << 4 | bytesout;
write8((void *)(spibar + 1), readwrite);
write8((void *)(spibar + 0), cmd);
reset_internal_fifo_pointer();
for (count = 0; count < bytesout; count++, dout++) {
write8((void *)(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((void *)(spibar + 0x0C));
}
reset_internal_fifo_pointer();
for (count = 0; count < bytesin; count++, din++) {
*(u8 *)din = read8((void *)(spibar + 0x0C));
}
return 0;
}
#if IS_ENABLED (CONFIG_SB800_IMC_FWM)
static void ImcSleep(void)
{
u8 cmd_val = 0x96; /* Kick off IMC Mailbox command 96 */
u8 reg0_val = 0; /* clear response register */
u8 reg1_val = 0xB4; /* request ownership flag */
WriteECmsg (MSG_REG0, AccWidthUint8, ®0_val);
WriteECmsg (MSG_REG1, AccWidthUint8, ®1_val);
WriteECmsg (MSG_SYS_TO_IMC, AccWidthUint8, &cmd_val);
WaitForEcLDN9MailboxCmdAck();
}
static void ImcWakeup(void)
{
u8 cmd_val = 0x96; /* Kick off IMC Mailbox command 96 */
u8 reg0_val = 0; /* clear response register */
u8 reg1_val = 0xB5; /* release ownership flag */
WriteECmsg (MSG_REG0, AccWidthUint8, ®0_val);
WriteECmsg (MSG_REG1, AccWidthUint8, ®1_val);
WriteECmsg (MSG_SYS_TO_IMC, AccWidthUint8, &cmd_val);
WaitForEcLDN9MailboxCmdAck();
}
#endif
int spi_claim_bus(struct spi_slave *slave)
{
#if IS_ENABLED (CONFIG_SB800_IMC_FWM)
if (slave->rw == SPI_WRITE_FLAG) {
bus_claimed++;
if (bus_claimed == 1)
ImcSleep();
}
#endif
return 0;
}
void spi_release_bus(struct spi_slave *slave)
{
#if IS_ENABLED (CONFIG_SB800_IMC_FWM)
if (slave->rw == SPI_WRITE_FLAG) {
bus_claimed--;
if (bus_claimed <= 0) {
bus_claimed = 0;
ImcWakeup();
}
}
#endif
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
{
struct spi_slave *slave = malloc(sizeof(*slave));
if (!slave) {
return NULL;
}
memset(slave, 0, sizeof(*slave));
return slave;
}
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