summaryrefslogtreecommitdiff
path: root/drivers/pci_auto.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci_auto.c')
-rw-r--r--drivers/pci_auto.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/pci_auto.c b/drivers/pci_auto.c
new file mode 100644
index 000000000..f665ee6fe
--- /dev/null
+++ b/drivers/pci_auto.c
@@ -0,0 +1,319 @@
+/*
+ * 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 + 1);
+ 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);
+ }
+}
+
+void pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
+{
+ unsigned int sub_bus;
+ unsigned short class;
+ unsigned char prg_iface;
+
+ pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
+
+ switch(class)
+ {
+ case PCI_CLASS_BRIDGE_PCI:
+ pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_io);
+
+ DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
+
+ pciauto_prescan_setup_bridge(hose, dev, PCI_BUS(dev));
+
+ sub_bus = pci_hose_scan_bus(hose, PCI_BUS(dev)+1);
+
+ pciauto_postscan_setup_bridge(hose, dev, sub_bus);
+ 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;
+ }
+
+ pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_io);
+ break;
+
+ default:
+ pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_io);
+ break;
+ }
+}
+
+#endif /* CONFIG_PCI */
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 19:58:23 +0000