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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 <device/mmio.h>
#include <lib.h>
#include <timer.h>
#include <console/console.h>
#include <commonlib/helpers.h>
#include <spi_flash.h>
#include <spi-generic.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ops.h>
#include <soc/southbridge.h>
#include <soc/pci_devs.h>
#define SPI_DEBUG_DRIVER CONFIG(DEBUG_SPI_FLASH)
static uintptr_t spibar;
static void set_spibar(uintptr_t base)
{
spibar = base;
}
static inline uint8_t spi_read8(uint8_t reg)
{
return read8((void *)(spibar + reg));
}
static inline uint32_t spi_read32(uint8_t reg)
{
return read32((void *)(spibar + reg));
}
static inline void spi_write8(uint8_t reg, uint8_t val)
{
write8((void *)(spibar + reg), val);
}
static inline void spi_write32(uint8_t reg, uint32_t val)
{
write32((void *)(spibar + reg), val);
}
static void dump_state(const char *str)
{
if (!SPI_DEBUG_DRIVER)
return;
printk(BIOS_DEBUG, "SPI: %s\n", str);
printk(BIOS_DEBUG, "Cntrl0: %x\n", spi_read32(SPI_CNTRL0));
printk(BIOS_DEBUG, "Status: %x\n", spi_read32(SPI_STATUS));
printk(BIOS_DEBUG, "TxByteCount: %x\n", spi_read8(SPI_TX_BYTE_COUNT));
printk(BIOS_DEBUG, "RxByteCount: %x\n", spi_read8(SPI_RX_BYTE_COUNT));
printk(BIOS_DEBUG, "CmdCode: %x\n", spi_read8(SPI_CMD_CODE));
hexdump((void *)(spibar + SPI_FIFO), SPI_FIFO_DEPTH);
}
static int wait_for_ready(void)
{
const uint32_t timeout_ms = 500;
struct stopwatch sw;
stopwatch_init_msecs_expire(&sw, timeout_ms);
do {
if (!(spi_read32(SPI_STATUS) & SPI_BUSY))
return 0;
} while (!stopwatch_expired(&sw));
return -1;
}
static int execute_command(void)
{
dump_state("Before Execute");
spi_write8(SPI_CMD_TRIGGER, SPI_CMD_TRIGGER_EXECUTE);
if (wait_for_ready())
printk(BIOS_DEBUG,
"FCH SPI Error: Timeout executing command\n");
dump_state("Transaction finished");
return 0;
}
void spi_init(void)
{
uintptr_t bar;
bar = pci_read_config32(SOC_LPC_DEV, SPIROM_BASE_ADDRESS_REGISTER);
bar = ALIGN_DOWN(bar, 64);
set_spibar(bar);
}
static int spi_ctrlr_xfer(const struct spi_slave *slave, const void *dout,
size_t bytesout, void *din, size_t bytesin)
{
size_t count;
uint8_t cmd;
uint8_t *bufin = din;
const uint8_t *bufout = dout;
if (SPI_DEBUG_DRIVER)
printk(BIOS_DEBUG, "%s(%zx, %zx)\n", __func__, bytesout,
bytesin);
/* First byte is cmd which cannot be sent through FIFO */
cmd = bufout[0];
bufout++;
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 + bytesin > SPI_FIFO_DEPTH) {
printk(BIOS_DEBUG, "FCH SPI: Too much to write. Does your SPI"
" chip driver use spi_crop_chunk()?\n");
return -1;
}
if (wait_for_ready())
return -1;
spi_write8(SPI_CMD_CODE, cmd);
spi_write8(SPI_TX_BYTE_COUNT, bytesout);
spi_write8(SPI_RX_BYTE_COUNT, bytesin);
for (count = 0; count < bytesout; count++)
spi_write8(SPI_FIFO + count, bufout[count]);
if (execute_command())
return -1;
for (count = 0; count < bytesin; count++)
bufin[count] = spi_read8(SPI_FIFO + count + bytesout);
return 0;
}
int chipset_volatile_group_begin(const struct spi_flash *flash)
{
return 0;
}
int chipset_volatile_group_end(const struct spi_flash *flash)
{
return 0;
}
static int xfer_vectors(const struct spi_slave *slave,
struct spi_op vectors[], size_t count)
{
return spi_flash_vector_helper(slave, vectors, count, spi_ctrlr_xfer);
}
static const struct spi_ctrlr spi_ctrlr = {
.xfer_vector = xfer_vectors,
.max_xfer_size = SPI_FIFO_DEPTH,
.flags = SPI_CNTRLR_DEDUCT_CMD_LEN | SPI_CNTRLR_DEDUCT_OPCODE_LEN,
};
const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = {
{
.ctrlr = &spi_ctrlr,
.bus_start = 0,
.bus_end = 0,
},
};
const size_t spi_ctrlr_bus_map_count = ARRAY_SIZE(spi_ctrlr_bus_map);
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