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Diffstat (limited to 'src/soc/amd/stoneyridge/spi.c')
| -rw-r--r-- | src/soc/amd/stoneyridge/spi.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/src/soc/amd/stoneyridge/spi.c b/src/soc/amd/stoneyridge/spi.c new file mode 100644 index 0000000000..84b56dfa3d --- /dev/null +++ b/src/soc/amd/stoneyridge/spi.c @@ -0,0 +1,207 @@ +/* + * 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 <arch/early_variables.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> +#include <soc/imc.h> + +static uintptr_t spibar CAR_GLOBAL; + +static uintptr_t get_spibase(void) +{ + return *(uintptr_t *)car_get_var_ptr(&spibar); +} + +static void set_spibar(uintptr_t base) +{ + *(uintptr_t *)car_get_var_ptr(&spibar) = base; +} + +static inline uint8_t spi_read8(uint8_t reg) +{ + return read8((void *)(get_spibase() + reg)); +} + +static inline uint32_t spi_read32(uint8_t reg) +{ + return read32((void *)(get_spibase() + reg)); +} + +static inline void spi_write8(uint8_t reg, uint8_t val) +{ + write8((void *)(get_spibase() + reg), val); +} + +static inline void spi_write32(uint8_t reg, uint32_t val) +{ + write32((void *)(get_spibase() + reg), val); +} + +static int reset_internal_fifo_pointer(void) +{ + uint8_t reg; + const uint32_t timeout_ms = 500; + struct stopwatch sw; + + stopwatch_init_msecs_expire(&sw, timeout_ms); + + do { + reg = spi_read8(SPI_REG_CNTRL02); + reg |= SPI_FIFO_PTR_CLR02; + spi_write8(SPI_REG_CNTRL02, reg); + /* wait for ptr=0 */ + if (!(spi_read8(SPI_CNTRL11) & (SPI_FIFO_PTR_MASK11))) + return 0; + } while (!stopwatch_expired(&sw)); + + printk(BIOS_DEBUG, "FCH SPI Error: FIFO reset failed\n"); + return -1; +} + +static int execute_command(void) +{ + uint32_t reg; + const uint32_t timeout_ms = 500; + struct stopwatch sw; + + stopwatch_init_msecs_expire(&sw, timeout_ms); + + reg = spi_read32(SPI_CNTRL0); + reg |= EXEC_OPCODE; + spi_write32(SPI_CNTRL0, reg); + + do { + if (!(spi_read32(SPI_CNTRL0) & (EXEC_OPCODE | SPI_BUSY))) + return 0; + } while (!stopwatch_expired(&sw)); + + printk(BIOS_DEBUG, "FCH SPI Error: Timeout executing command\n"); + return -1; +} + +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 do_command(uint8_t cmd, const void *dout, + size_t bytesout, void *din, size_t *bytesin) +{ + size_t count; + size_t max_in = MIN(*bytesin, SPI_FIFO_DEPTH); + + spi_write8(SPI_EXT_INDEX, SPI_TX_BYTE_COUNT); + spi_write8(SPI_EXT_DATA, bytesout); + spi_write8(SPI_EXT_INDEX, SPI_RX_BYTE_COUNT); + spi_write8(SPI_EXT_DATA, max_in); + spi_write8(SPI_CNTRL0, cmd); + + if (reset_internal_fifo_pointer()) + return -1; + for (count = 0; count < bytesout; count++, dout++) + spi_write8(SPI_CNTRL1, *(uint8_t *)dout); + + if (execute_command()) + return -1; + + if (reset_internal_fifo_pointer()) + return -1; + for (count = 0; count < bytesout; count++) + spi_read8(SPI_CNTRL1); /* skip the bytes we sent */ + + for (count = 0; count < max_in; count++, din++) + *(uint8_t *)din = spi_read8(SPI_CNTRL1); + + *bytesin -= max_in; + return 0; +} + +static int spi_ctrlr_xfer(const struct spi_slave *slave, const void *dout, + size_t bytesout, void *din, size_t bytesin) +{ + uint8_t cmd; + + /* First byte is cmd which cannot be sent through FIFO */ + cmd = *(uint8_t *)dout++; + 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 > SPI_FIFO_DEPTH) { + printk(BIOS_DEBUG, "FCH SPI: Too much to write. Does your SPI" + " chip driver use spi_crop_chunk()?\n"); + return -1; + } + + do { + if (do_command(cmd, dout, bytesout, din, &bytesin)) + return -1; + } while (bytesin); + + return 0; +} + +int chipset_volatile_group_begin(const struct spi_flash *flash) +{ + if (IS_ENABLED(CONFIG_STONEYRIDGE_IMC_FWM)) + imc_sleep(); + return 0; +} + +int chipset_volatile_group_end(const struct spi_flash *flash) +{ + if (IS_ENABLED(CONFIG_STONEYRIDGE_IMC_FWM)) + imc_wakeup(); + return 0; +} + +static const struct spi_ctrlr spi_ctrlr = { + .xfer = spi_ctrlr_xfer, + .xfer_vector = spi_xfer_two_vectors, + .max_xfer_size = SPI_FIFO_DEPTH, + .deduct_cmd_len = true, +}; + +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); |