diff options
Diffstat (limited to 'src/soc/amd/picasso/spi.c')
| -rw-r--r-- | src/soc/amd/picasso/spi.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/soc/amd/picasso/spi.c b/src/soc/amd/picasso/spi.c new file mode 100644 index 0000000000..8abfa160f4 --- /dev/null +++ b/src/soc/amd/picasso/spi.c @@ -0,0 +1,189 @@ +/* + * 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 <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 <amdblocks/lpc.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) +{ + set_spibar(lpc_get_spibase()); +} + +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); |