diff options
Diffstat (limited to 'src/southbridge/amd/sb700/enable_usbdebug.c')
| -rw-r--r-- | src/southbridge/amd/sb700/enable_usbdebug.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/southbridge/amd/sb700/enable_usbdebug.c b/src/southbridge/amd/sb700/enable_usbdebug.c new file mode 100644 index 0000000000..d74a9bbc9f --- /dev/null +++ b/src/southbridge/amd/sb700/enable_usbdebug.c @@ -0,0 +1,63 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2010 Advanced Micro Devices, Inc. + * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdint.h> +#include <arch/io.h> +#include <arch/romcc_io.h> +#include <usbdebug.h> +#include <device/pci_def.h> +#include "sb700.h" + +#define EHCI_EOR (CONFIG_EHCI_BAR + 0x20) +#define DEBUGPORT_MISC_CONTROL (EHCI_EOR + 0x80) + +void set_debug_port(unsigned int port) +{ + u32 reg32; + + /* Write the port number to DEBUGPORT_MISC_CONTROL[31:28]. */ + reg32 = read32(DEBUGPORT_MISC_CONTROL); + reg32 &= ~(0xf << 28); + reg32 |= (port << 28); + reg32 |= (1 << 27); /* Enable Debug Port port number remapping. */ + write32(DEBUGPORT_MISC_CONTROL, reg32); +} + +/* + * Note: The SB700 has two EHCI devices, D18:F2 and D19:F2. + * This code currently only supports the first one, i.e., USB Debug devices + * attached to physical USB ports belonging to the first EHCI device. + */ +void sb700_enable_usbdebug(unsigned int port) +{ + device_t dev = PCI_DEV(0, 0x12, 2); /* USB EHCI, D18:F2 */ + + /* Set the EHCI BAR address. */ + pci_write_config32(dev, EHCI_BAR_INDEX, CONFIG_EHCI_BAR); + + /* Enable access to the EHCI memory space registers. */ + pci_write_config8(dev, PCI_COMMAND, PCI_COMMAND_MEMORY); + + /* + * Select the requested physical USB port (1-15) as the Debug Port. + * Must be called after the EHCI BAR has been set up (see above). + */ + set_debug_port(port); +} |