diff options
Diffstat (limited to 'src/devices/pcix_device.c')
| -rw-r--r-- | src/devices/pcix_device.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/devices/pcix_device.c b/src/devices/pcix_device.c new file mode 100644 index 0000000000..8915e56a1b --- /dev/null +++ b/src/devices/pcix_device.c @@ -0,0 +1,140 @@ +/* (c) 2005 Linux Networx GPL see COPYING for details */ + +#include <console/console.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pci_ids.h> +#include <device/pcix.h> + + +static void pcix_tune_dev(device_t dev) +{ + unsigned cap; + unsigned status, orig_cmd, cmd; + unsigned max_read, max_tran; + + if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) { + return; + } + cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); + if (!cap) { + return; + } + printk_debug("%s PCI-X tuning\n", dev_path(dev)); + status = pci_read_config32(dev, cap + PCI_X_STATUS); + orig_cmd = cmd = pci_read_config16(dev,cap + PCI_X_CMD); + + max_read = (status & PCI_X_STATUS_MAX_READ) >> 21; + max_tran = (status & PCI_X_STATUS_MAX_SPLIT) >> 23; + if (max_read != ((cmd & PCI_X_CMD_MAX_READ) >> 2)) { + cmd &= ~PCI_X_CMD_MAX_READ; + cmd |= max_read << 2; + } + if (max_tran != ((cmd & PCI_X_CMD_MAX_SPLIT) >> 4)) { + cmd &= ~PCI_X_CMD_MAX_SPLIT; + cmd |= max_tran << 4; + } + /* Don't attempt to handle PCI-X errors */ + cmd &= ~PCI_X_CMD_DPERR_E; + /* Enable Relaxed Ordering */ + cmd |= PCI_X_CMD_ERO; + if (orig_cmd != cmd) { + pci_write_config16(dev, cap + PCI_X_CMD, cmd); + } +} + +unsigned int pcix_scan_bus(struct bus *bus, + unsigned min_devfn, unsigned max_devfn, unsigned int max) +{ + device_t child; + max = pci_scan_bus(bus, min_devfn, max_devfn, max); + for(child = bus->children; child; child = child->sibling) { + if ( (child->path.u.pci.devfn < min_devfn) || + (child->path.u.pci.devfn > max_devfn)) + { + continue; + } + pcix_tune_dev(child); + } + return max; +} + +const char *pcix_speed(unsigned sstatus) +{ + static const char conventional[] = "Conventional PCI"; + static const char pcix_66mhz[] = "66MHz PCI-X"; + static const char pcix_100mhz[] = "100MHz PCI-X"; + static const char pcix_133mhz[] = "133MHz PCI-X"; + static const char pcix_266mhz[] = "266MHz PCI-X"; + static const char pcix_533mhz[] = "533MHZ PCI-X"; + static const char unknown[] = "Unknown"; + + const char *result; + result = unknown; + switch(PCI_X_SSTATUS_MFREQ(sstatus)) { + case PCI_X_SSTATUS_CONVENTIONAL_PCI: + result = conventional; + break; + case PCI_X_SSTATUS_MODE1_66MHZ: + result = pcix_66mhz; + break; + case PCI_X_SSTATUS_MODE1_100MHZ: + result = pcix_100mhz; + break; + + case PCI_X_SSTATUS_MODE1_133MHZ: + result = pcix_133mhz; + break; + + case PCI_X_SSTATUS_MODE2_266MHZ_REF_66MHZ: + case PCI_X_SSTATUS_MODE2_266MHZ_REF_100MHZ: + case PCI_X_SSTATUS_MODE2_266MHZ_REF_133MHZ: + result = pcix_266mhz; + break; + + case PCI_X_SSTATUS_MODE2_533MHZ_REF_66MHZ: + case PCI_X_SSTATUS_MODE2_533MHZ_REF_100MHZ: + case PCI_X_SSTATUS_MODE2_533MHZ_REF_133MHZ: + result = pcix_533mhz; + break; + } + return result; +} + +unsigned int pcix_scan_bridge(device_t dev, unsigned int max) +{ + unsigned pos; + unsigned sstatus; + + /* Find the PCI-X capability */ + pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); + sstatus = pci_read_config16(dev, pos + PCI_X_SEC_STATUS); + + if (PCI_X_SSTATUS_MFREQ(sstatus) == PCI_X_SSTATUS_CONVENTIONAL_PCI) { + max = do_pci_scan_bridge(dev, max, pci_scan_bus); + } else { + max = do_pci_scan_bridge(dev, max, pcix_scan_bus); + } + + /* Print the PCI-X bus speed */ + printk_debug("PCI: %02x: %s\n", dev->link[0].secondary, pcix_speed(sstatus)); + + return max; +} + + +/** Default device operations for PCI-X bridges */ +static struct pci_operations pcix_bus_ops_pci = { + .set_subsystem = 0, +}; + +struct device_operations default_pcix_ops_bus = { + .read_resources = pci_bus_read_resources, + .set_resources = pci_dev_set_resources, + .enable_resources = pci_bus_enable_resources, + .init = 0, + .scan_bus = pcix_scan_bridge, + .enable = 0, + .reset_bus = pci_bus_reset, + .ops_pci = &pcix_bus_ops_pci, +}; |