| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering |
| * 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 <spi_flash.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ops.h> |
| |
| #define AMD_SB_SPI_TX_LEN 8 |
| |
| static uint32_t get_spi_bar(void) |
| { |
| device_t dev; |
| |
| dev = dev_find_slot(0, PCI_DEVFN(0x14, 3)); |
| return pci_read_config32(dev, 0xa0) & ~0x1f; |
| } |
| |
| void spi_init(void) |
| { |
| /* Not needed */ |
| } |
| |
| unsigned int spi_crop_chunk(unsigned int cmd_len, unsigned int buf_len) |
| { |
| return min(AMD_SB_SPI_TX_LEN - cmd_len, buf_len); |
| } |
| |
| static void reset_internal_fifo_pointer(void) |
| { |
| uint32_t spibar = get_spi_bar(); |
| |
| do { |
| write8((void *)(spibar + 2), |
| read8((void *)(spibar + 2)) | 0x10); |
| } while (read8((void *)(spibar + 0xd)) & 0x7); |
| } |
| |
| static void execute_command(void) |
| { |
| uint32_t spibar = get_spi_bar(); |
| |
| write8((void *)(spibar + 2), read8((void *)(spibar + 2)) | 1); |
| |
| while ((read8((void *)(spibar + 2)) & 1) && |
| (read8((void *)(spibar+3)) & 0x80)); |
| } |
| |
| int spi_claim_bus(struct spi_slave *slave) |
| { |
| /* Handled internally by the SB700 */ |
| return 0; |
| } |
| |
| void spi_release_bus(struct spi_slave *slave) |
| { |
| /* Handled internally by the SB700 */ |
| } |
| |
| 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; |
| } |
| |
| int spi_xfer(struct spi_slave *slave, const void *dout, |
| unsigned int bytesout, void *din, unsigned int bytesin) |
| { |
| /* First byte is cmd which cannot be sent through the FIFO. */ |
| u8 cmd = *(u8 *)dout++; |
| u8 readoffby1; |
| u8 readwrite; |
| u8 count; |
| |
| uint32_t spibar = get_spi_bar(); |
| |
| 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; |
| } |