| /* |
| * 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_HUDSON_IMC_FWM) |
| #include <Proc/Fch/FchPlatform.h> |
| |
| static int bus_claimed = 0; |
| #endif |
| |
| #define SPI_REG_OPCODE 0x0 |
| #define SPI_REG_CNTRL01 0x1 |
| #define SPI_REG_CNTRL02 0x2 |
| #define CNTRL02_FIFO_RESET (1 << 4) |
| #define CNTRL02_EXEC_OPCODE (1 << 0) |
| #define SPI_REG_CNTRL03 0x3 |
| #define CNTRL03_SPIBUSY (1 << 7) |
| #define SPI_REG_FIFO 0xc |
| #define SPI_REG_CNTRL11 0xd |
| #define CNTRL11_FIFOPTR_MASK 0x07 |
| |
| #if IS_ENABLED(CONFIG_SOUTHBRIDGE_AMD_AGESA_YANGTZE) |
| #define AMD_SB_SPI_TX_LEN 64 |
| #else |
| #define AMD_SB_SPI_TX_LEN 8 |
| #endif |
| |
| static uintptr_t spibar; |
| |
| static inline uint8_t spi_read(uint8_t reg) |
| { |
| return read8((void *)(spibar + reg)); |
| } |
| |
| static inline void spi_write(uint8_t reg, uint8_t val) |
| { |
| write8((void *)(spibar + reg), val); |
| } |
| |
| static void reset_internal_fifo_pointer(void) |
| { |
| uint8_t reg8; |
| |
| do { |
| reg8 = spi_read(SPI_REG_CNTRL02); |
| reg8 |= CNTRL02_FIFO_RESET; |
| spi_write(SPI_REG_CNTRL02, reg8); |
| } while (spi_read(SPI_REG_CNTRL11) & CNTRL11_FIFOPTR_MASK); |
| } |
| |
| static void execute_command(void) |
| { |
| uint8_t reg8; |
| |
| reg8 = spi_read(SPI_REG_CNTRL02); |
| reg8 |= CNTRL02_EXEC_OPCODE; |
| spi_write(SPI_REG_CNTRL02, reg8); |
| |
| while ((spi_read(SPI_REG_CNTRL02) & CNTRL02_EXEC_OPCODE) && |
| (spi_read(SPI_REG_CNTRL03) & CNTRL03_SPIBUSY)); |
| } |
| |
| void spi_init(void) |
| { |
| 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 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; |
| |
| #if CONFIG_SOUTHBRIDGE_AMD_AGESA_YANGTZE |
| spi_write(0x1E, 5); |
| spi_write(0x1F, bytesout); /* SpiExtRegIndx [5] - TxByteCount */ |
| spi_write(0x1E, 6); |
| spi_write(0x1F, bytesin); /* SpiExtRegIndx [6] - RxByteCount */ |
| #else |
| u8 readwrite = (bytesin + readoffby1) << 4 | bytesout; |
| spi_write(SPI_REG_CNTRL01, readwrite); |
| #endif |
| spi_write(SPI_REG_OPCODE, cmd); |
| |
| reset_internal_fifo_pointer(); |
| for (count = 0; count < bytesout; count++, dout++) { |
| spi_write(SPI_REG_FIFO, *(uint8_t *)dout); |
| } |
| |
| reset_internal_fifo_pointer(); |
| execute_command(); |
| |
| reset_internal_fifo_pointer(); |
| /* Skip the bytes we sent. */ |
| for (count = 0; count < bytesout; count++) { |
| cmd = spi_read(SPI_REG_FIFO); |
| } |
| |
| reset_internal_fifo_pointer(); |
| for (count = 0; count < bytesin; count++, din++) { |
| *(uint8_t *)din = spi_read(SPI_REG_FIFO); |
| } |
| |
| return 0; |
| } |
| int spi_claim_bus(struct spi_slave *slave) |
| { |
| #if IS_ENABLED (CONFIG_HUDSON_IMC_FWM) |
| |
| if (slave->rw == SPI_WRITE_FLAG) { |
| bus_claimed++; |
| if (bus_claimed == 1) |
| ImcSleep(NULL); |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| void spi_release_bus(struct spi_slave *slave) |
| { |
| #if IS_ENABLED (CONFIG_HUDSON_IMC_FWM) |
| |
| if (slave->rw == SPI_WRITE_FLAG) { |
| bus_claimed--; |
| if (bus_claimed <= 0) { |
| bus_claimed = 0; |
| ImcWakeup(NULL); |
| } |
| } |
| #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; |
| } |