diff options
Diffstat (limited to 'src/southbridge/via/k8t890/pcie.c')
| -rw-r--r-- | src/southbridge/via/k8t890/pcie.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/southbridge/via/k8t890/pcie.c b/src/southbridge/via/k8t890/pcie.c new file mode 100644 index 0000000000..2840bf3b2d --- /dev/null +++ b/src/southbridge/via/k8t890/pcie.c @@ -0,0 +1,176 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> + * + * 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 <console/console.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pciexp.h> +#include <device/pci_ids.h> +#include <delay.h> +#include "k8t890.h" + +/* + * Note: + * The pcie bridges are similar to the VX800 ones documented at + * http://linux.via.com.tw/ + */ + +static void pcie_common_init(struct device *dev) +{ + u8 reg; + int i, up; + + /* Disable downstream read cycle retry, + * otherwise the bus scan will hang if no device is plugged in. */ + reg = pci_read_config8(dev, 0xa3); + pci_write_config8(dev, 0xa3, reg & ~0x01); + + /* Use PHY negotiation for lane config */ + reg = pci_read_config8(dev, 0xc1); + pci_write_config8(dev, 0xc1, reg & ~0x1f); + + /* Award has 0xb, VIA recommends 0xd, default 0x8. + * bit4: receive polarity change control + * bits3:2: squelch window select 64~175mv + * bit1: Number of non-idle bits detected before exiting idle state + * 0: 10 bits, 1: 2 bits + * bit0: Number of idle bits detected before entering idle state + * 0: 10 bits, 1: 2 bits + */ + pci_write_config8(dev, 0xe1, 0xb); + + /* Set replay timer limit. */ + pci_write_config8(dev, 0xb1, 0xf0); + + /* Enable link. */ + reg = pci_read_config8(dev, 0x50); + pci_write_config8(dev, 0x50, reg & ~0x10); + + /* Wait up to 100ms for link to come up */ + up = 0; + for (i=0; i<1000; i++) { + if (pci_read_config16(dev, 0x52) & (1<<13)) { + up = 1; + break; + } + udelay(100); + } + + printk(BIOS_SPEW, "%s PCIe link ", dev_path(dev)); + if (up) + printk(BIOS_SPEW, "up after %d us\n", i*100); + else + printk(BIOS_SPEW, "timeout\n"); + + dump_south(dev); +} + +static void peg_init(struct device *dev) +{ + u8 reg; + + printk(BIOS_DEBUG, "Configuring PCIe PEG\n"); + dump_south(dev); + + /* Disable link. */ + reg = pci_read_config8(dev, 0x50); + pci_write_config8(dev, 0x50, reg | 0x10); + + /* + * pci_write_config8(dev, 0xe2, 0x0); + * pci_write_config8(dev, 0xe3, 0x92); + */ + + /* Bit0 = 1 SDP (Start DLLP) always at Lane0. */ + reg = pci_read_config8(dev, 0xb8); + pci_write_config8(dev, 0xb8, reg | 0x1); + + /* + * Downstream wait and Upstream Checking Malformed TLP through + * "Byte Enable Rule" And "Over 4K Boundary Rule". + */ + reg = pci_read_config8(dev, 0xa4); + pci_write_config8(dev, 0xa4, reg | 0x30); + + pcie_common_init(dev); +} + +static void pcie_init(struct device *dev) +{ + u8 reg; + + printk(BIOS_DEBUG, "Configuring PCIe PEXs\n"); + dump_south(dev); + + /* Disable link. */ + reg = pci_read_config8(dev, 0x50); + pci_write_config8(dev, 0x50, reg | 0x10); + + pcie_common_init(dev); +} + +static const struct device_operations peg_ops = { + .read_resources = pci_bus_read_resources, + .set_resources = pci_dev_set_resources, + .enable_resources = pci_bus_enable_resources, + .enable = peg_init, + .scan_bus = pciexp_scan_bridge, + .reset_bus = pci_bus_reset, + .ops_pci = 0, +}; + +static const struct device_operations pcie_ops = { + .read_resources = pci_bus_read_resources, + .set_resources = pci_dev_set_resources, + .enable_resources = pci_bus_enable_resources, + .enable = pcie_init, + .scan_bus = pciexp_scan_bridge, + .reset_bus = pci_bus_reset, + .ops_pci = 0, +}; + +static const struct pci_driver northbridge_driver __pci_driver = { + .ops = &peg_ops, + .vendor = PCI_VENDOR_ID_VIA, + .device = PCI_DEVICE_ID_VIA_K8T890CE_PEG, +}; + +static const struct pci_driver pcie_drvd3f0 __pci_driver = { + .ops = &pcie_ops, + .vendor = PCI_VENDOR_ID_VIA, + .device = PCI_DEVICE_ID_VIA_K8T890CE_PEX0, +}; + +static const struct pci_driver pcie_drvd3f1 __pci_driver = { + .ops = &pcie_ops, + .vendor = PCI_VENDOR_ID_VIA, + .device = PCI_DEVICE_ID_VIA_K8T890CE_PEX1, +}; + +static const struct pci_driver pcie_drvd3f2 __pci_driver = { + .ops = &pcie_ops, + .vendor = PCI_VENDOR_ID_VIA, + .device = PCI_DEVICE_ID_VIA_K8T890CE_PEX2, +}; + +static const struct pci_driver pcie_drvd3f3 __pci_driver = { + .ops = &pcie_ops, + .vendor = PCI_VENDOR_ID_VIA, + .device = PCI_DEVICE_ID_VIA_K8T890CE_PEX3, +}; |