diff options
Diffstat (limited to 'drivers/pci_auto.c')
| -rwxr-xr-x | drivers/pci_auto.c | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/drivers/pci_auto.c b/drivers/pci_auto.c new file mode 100755 index 0000000..3302457 --- /dev/null +++ b/drivers/pci_auto.c @@ -0,0 +1,342 @@ +/* + * arch/ppc/kernel/pci_auto.c + * + * PCI autoconfiguration library + * + * Author: Matt Porter <mporter@mvista.com> + * + * Copyright 2000 MontaVista Software 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; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <common.h> + +#ifdef CONFIG_PCI + +#include <pci.h> + +#undef DEBUG +#ifdef DEBUG +#define DEBUGF(x...) printf(x) +#else +#define DEBUGF(x...) +#endif /* DEBUG */ + +#define PCIAUTO_IDE_MODE_MASK 0x05 + +/* + * + */ + +void pciauto_region_init(struct pci_region* res) +{ + res->bus_lower = res->bus_start; +} + +void pciauto_region_align(struct pci_region *res, unsigned long size) +{ + res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1; +} + +int pciauto_region_allocate(struct pci_region* res, unsigned int size, unsigned int *bar) +{ + unsigned long addr; + + if (!res) { + DEBUGF("No resource"); + goto error; + } + + addr = ((res->bus_lower - 1) | (size - 1)) + 1; + + if (addr - res->bus_start + size > res->size) { + DEBUGF("No room in resource"); + goto error; + } + + res->bus_lower = addr + size; + + DEBUGF("address=0x%lx", addr); + + *bar = addr; + return 0; + + error: + *bar = 0xffffffff; + return -1; +} + +/* + * + */ + +void pciauto_setup_device(struct pci_controller *hose, + pci_dev_t dev, int bars_num, + struct pci_region *mem, + struct pci_region *io) +{ + unsigned int bar_value, bar_response, bar_size; + unsigned int cmdstat = 0; + struct pci_region *bar_res; + int bar, bar_nr = 0; + int found_mem64 = 0; + + pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat); + cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER; + + for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_0 + (bars_num*4); bar += 4) { + /* Tickle the BAR and get the response */ + pci_hose_write_config_dword(hose, dev, bar, 0xffffffff); + pci_hose_read_config_dword(hose, dev, bar, &bar_response); + + /* If BAR is not implemented go to the next BAR */ + if (!bar_response) + continue; + + found_mem64 = 0; + + /* Check the BAR type and set our address mask */ + if (bar_response & PCI_BASE_ADDRESS_SPACE) { + bar_size = ~(bar_response & PCI_BASE_ADDRESS_IO_MASK) + 1; + bar_res = io; + + DEBUGF("PCI Autoconfig: BAR %d, I/O, size=0x%x, ", bar_nr, bar_size); + } else { + if ( (bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == + PCI_BASE_ADDRESS_MEM_TYPE_64) + found_mem64 = 1; + + bar_size = ~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1; + bar_res = mem; + + DEBUGF("PCI Autoconfig: BAR %d, Mem, size=0x%x, ", bar_nr, bar_size); + } + + if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) { + /* Write it out and update our limit */ + pci_hose_write_config_dword(hose, dev, bar, bar_value); + + /* + * If we are a 64-bit decoder then increment to the + * upper 32 bits of the bar and force it to locate + * in the lower 4GB of memory. + */ + if (found_mem64) { + bar += 4; + pci_hose_write_config_dword(hose, dev, bar, 0x00000000); + } + + cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ? + PCI_COMMAND_IO : PCI_COMMAND_MEMORY; + } + + DEBUGF("\n"); + + bar_nr++; + } + + pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat); + pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08); + pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80); +} + +static void pciauto_prescan_setup_bridge(struct pci_controller *hose, + pci_dev_t dev, int sub_bus) +{ + struct pci_region *pci_mem = hose->pci_mem; + struct pci_region *pci_io = hose->pci_io; + unsigned int cmdstat; + + pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat); + + /* Configure bus number registers */ + pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS, PCI_BUS(dev)); + pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS, sub_bus); + pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff); + + if (pci_mem) { + /* Round memory allocator to 1MB boundary */ + pciauto_region_align(pci_mem, 0x100000); + + /* Set up memory and I/O filter limits, assume 32-bit I/O space */ + pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE, + (pci_mem->bus_lower & 0xfff00000) >> 16); + + cmdstat |= PCI_COMMAND_MEMORY; + } + + if (pci_io) { + /* Round I/O allocator to 4KB boundary */ + pciauto_region_align(pci_io, 0x1000); + + pci_hose_write_config_byte(hose, dev, PCI_IO_BASE, + (pci_io->bus_lower & 0x0000f000) >> 8); + pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16, + (pci_io->bus_lower & 0xffff0000) >> 16); + + cmdstat |= PCI_COMMAND_IO; + } + + /* We don't support prefetchable memory for now, so disable */ + pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000); + pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x1000); + + /* Enable memory and I/O accesses, enable bus master */ + pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER); +} + +static void pciauto_postscan_setup_bridge(struct pci_controller *hose, + pci_dev_t dev, int sub_bus) +{ + struct pci_region *pci_mem = hose->pci_mem; + struct pci_region *pci_io = hose->pci_io; + + /* Configure bus number registers */ + pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, sub_bus); + + if (pci_mem) { + /* Round memory allocator to 1MB boundary */ + pciauto_region_align(pci_mem, 0x100000); + + pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT, + (pci_mem->bus_lower-1) >> 16); + } + + if (pci_io) { + /* Round I/O allocator to 4KB boundary */ + pciauto_region_align(pci_io, 0x1000); + + pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT, + ((pci_io->bus_lower-1) & 0x0000f000) >> 8); + pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16, + ((pci_io->bus_lower-1) & 0xffff0000) >> 16); + } +} + +/* + * + */ + +void pciauto_config_init(struct pci_controller *hose) +{ + int i; + + hose->pci_io = hose->pci_mem = NULL; + + for (i=0; i<hose->region_count; i++) { + switch(hose->regions[i].flags) { + case PCI_REGION_IO: + if (!hose->pci_io || + hose->pci_io->size < hose->regions[i].size) + hose->pci_io = hose->regions + i; + break; + case PCI_REGION_MEM: + if (!hose->pci_mem || + hose->pci_mem->size < hose->regions[i].size) + hose->pci_mem = hose->regions + i; + break; + } + } + + + if (hose->pci_mem) { + pciauto_region_init(hose->pci_mem); + + DEBUGF("PCI Autoconfig: Memory region: [%lx-%lx]\n", + hose->pci_mem->bus_start, + hose->pci_mem->bus_start + hose->pci_mem->size - 1); + } + + if (hose->pci_io) { + pciauto_region_init(hose->pci_io); + + DEBUGF("PCI Autoconfig: I/O region: [%lx-%lx]\n", + hose->pci_io->bus_start, + hose->pci_io->bus_start + hose->pci_io->size - 1); + } +} + +/* HJF: Changed this to return int. I think this is required + * to get the correct result when scanning bridges + */ +int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev) +{ + unsigned int sub_bus = PCI_BUS(dev); + unsigned short class; + unsigned char prg_iface; + int n; + + pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class); + + switch(class) { + case PCI_CLASS_BRIDGE_PCI: + hose->current_busno++; + pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_io); + + DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev)); + + /* Passing in current_busno allows for sibling P2P bridges */ + pciauto_prescan_setup_bridge(hose, dev, hose->current_busno); + /* + * need to figure out if this is a subordinate bridge on the bus + * to be able to properly set the pri/sec/sub bridge registers. + */ + n = pci_hose_scan_bus(hose, hose->current_busno); + + /* figure out the deepest we've gone for this leg */ + sub_bus = max(n, sub_bus); + pciauto_postscan_setup_bridge(hose, dev, sub_bus); + + sub_bus = hose->current_busno; + break; + + case PCI_CLASS_STORAGE_IDE: + pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prg_iface); + if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) { + DEBUGF("PCI Autoconfig: Skipping legacy mode IDE controller\n"); + return sub_bus; + } + + pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_io); + break; + + case PCI_CLASS_BRIDGE_CARDBUS: + /* just do a minimal setup of the bridge, let the OS take care of the rest */ + pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_io); + + DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n", PCI_DEV(dev)); + + hose->current_busno++; + break; + +#ifdef CONFIG_MPC5200 + case PCI_CLASS_BRIDGE_OTHER: + DEBUGF("PCI Autoconfig: Skipping bridge device %d\n", + PCI_DEV(dev)); + break; +#endif +#ifdef CONFIG_MPC834X + case PCI_CLASS_BRIDGE_OTHER: + /* + * The host/PCI bridge 1 seems broken in 8349 - it presents + * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_ + * device claiming resources io/mem/irq.. we only allow for + * the PIMMR window to be allocated (BAR0 - 1MB size) + */ + DEBUGF("PCI Autoconfig: Broken bridge found, only minimal config\n"); + pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_io); + break; +#endif + default: + pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_io); + break; + } + + return sub_bus; +} + +#endif /* CONFIG_PCI */ |