dm: pci: Move common auto-config functions to a common file

Some functions will be used by driver model and legacy PCI code. To avoid
duplication, put these in a separate, shared file.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 128 insertions, 0 deletions

diff --git a/drivers/pci/pci_auto_common.c b/drivers/pci/pci_auto_common.c
new file mode 100644
index 0000000000..85c419e6f4
--- /dev/null
+++ b/drivers/pci/pci_auto_common.c
@@ -0,0 +1,128 @@
+/*
+ * PCI auto-configuration library
+ *
+ * Author: Matt Porter <mporter@mvista.com>
+ *
+ * Copyright 2000 MontaVista Software Inc.
+ *
+ * Modifications for driver model:
+ * Copyright 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <pci.h>
+
+void pciauto_region_init(struct pci_region *res)
+{
+	/*
+	 * Avoid allocating PCI resources from address 0 -- this is illegal
+	 * according to PCI 2.1 and moreover, this is known to cause Linux IDE
+	 * drivers to fail. Use a reasonable starting value of 0x1000 instead.
+	 */
+	res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
+}
+
+void pciauto_region_align(struct pci_region *res, pci_size_t size)
+{
+	res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
+}
+
+int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
+	pci_addr_t *bar)
+{
+	pci_addr_t addr;
+
+	if (!res) {
+		debug("No resource");
+		goto error;
+	}
+
+	addr = ((res->bus_lower - 1) | (size - 1)) + 1;
+
+	if (addr - res->bus_start + size > res->size) {
+		debug("No room in resource");
+		goto error;
+	}
+
+	res->bus_lower = addr + size;
+
+	debug("address=0x%llx bus_lower=0x%llx", (unsigned long long)addr,
+	      (unsigned long long)res->bus_lower);
+
+	*bar = addr;
+	return 0;
+
+ error:
+	*bar = (pci_addr_t)-1;
+	return -1;
+}
+
+void pciauto_config_init(struct pci_controller *hose)
+{
+	int i;
+
+	hose->pci_io = NULL;
+	hose->pci_mem = NULL;
+	hose->pci_prefetch = 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;
+		case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
+			if (!hose->pci_prefetch ||
+			    hose->pci_prefetch->size < hose->regions[i].size)
+				hose->pci_prefetch = hose->regions + i;
+			break;
+		}
+	}
+
+
+	if (hose->pci_mem) {
+		pciauto_region_init(hose->pci_mem);
+
+		debug("PCI Autoconfig: Bus Memory region: [0x%llx-0x%llx],\n"
+		       "\t\tPhysical Memory [%llx-%llxx]\n",
+		    (u64)hose->pci_mem->bus_start,
+		    (u64)(hose->pci_mem->bus_start + hose->pci_mem->size - 1),
+		    (u64)hose->pci_mem->phys_start,
+		    (u64)(hose->pci_mem->phys_start + hose->pci_mem->size - 1));
+	}
+
+	if (hose->pci_prefetch) {
+		pciauto_region_init(hose->pci_prefetch);
+
+		debug("PCI Autoconfig: Bus Prefetchable Mem: [0x%llx-0x%llx],\n"
+		       "\t\tPhysical Memory [%llx-%llx]\n",
+		    (u64)hose->pci_prefetch->bus_start,
+		    (u64)(hose->pci_prefetch->bus_start +
+			    hose->pci_prefetch->size - 1),
+		    (u64)hose->pci_prefetch->phys_start,
+		    (u64)(hose->pci_prefetch->phys_start +
+			    hose->pci_prefetch->size - 1));
+	}
+
+	if (hose->pci_io) {
+		pciauto_region_init(hose->pci_io);
+
+		debug("PCI Autoconfig: Bus I/O region: [0x%llx-0x%llx],\n"
+		       "\t\tPhysical Memory: [%llx-%llx]\n",
+		    (u64)hose->pci_io->bus_start,
+		    (u64)(hose->pci_io->bus_start + hose->pci_io->size - 1),
+		    (u64)hose->pci_io->phys_start,
+		    (u64)(hose->pci_io->phys_start + hose->pci_io->size - 1));
+	}
+}