summaryrefslogtreecommitdiffstats
path: root/arch/mips/pci/pci-generic.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/pci/pci-generic.c')
-rw-r--r--arch/mips/pci/pci-generic.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/mips/pci/pci-generic.c b/arch/mips/pci/pci-generic.c
new file mode 100644
index 0000000000..d2d68bac3d
--- /dev/null
+++ b/arch/mips/pci/pci-generic.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Imagination Technologies
+ * Author: Paul Burton <paul.burton@mips.com>
+ *
+ * pcibios_align_resource taken from arch/arm/kernel/bios32.c.
+ */
+
+#include <linux/pci.h>
+
+/*
+ * We need to avoid collisions with `mirrored' VGA ports
+ * and other strange ISA hardware, so we always want the
+ * addresses to be allocated in the 0x000-0x0ff region
+ * modulo 0x400.
+ *
+ * Why? Because some silly external IO cards only decode
+ * the low 10 bits of the IO address. The 0x00-0xff region
+ * is reserved for motherboard devices that decode all 16
+ * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
+ * but we want to try to avoid allocating at 0x2900-0x2bff
+ * which might have be mirrored at 0x0100-0x03ff..
+ */
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+ resource_size_t size, resource_size_t align)
+{
+ struct pci_dev *dev = data;
+ resource_size_t start = res->start;
+ struct pci_host_bridge *host_bridge;
+
+ if (res->flags & IORESOURCE_IO && start & 0x300)
+ start = (start + 0x3ff) & ~0x3ff;
+
+ start = (start + align - 1) & ~(align - 1);
+
+ host_bridge = pci_find_host_bridge(dev->bus);
+
+ if (host_bridge->align_resource)
+ return host_bridge->align_resource(dev, res,
+ start, size, align);
+
+ return start;
+}
+
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+ pci_read_bridge_bases(bus);
+}
+
+#ifdef pci_remap_iospace
+int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
+{
+ unsigned long vaddr;
+
+ if (res->start != 0) {
+ WARN_ONCE(1, "resource start address is not zero\n");
+ return -ENODEV;
+ }
+
+ vaddr = (unsigned long)ioremap(phys_addr, resource_size(res));
+ set_io_port_base(vaddr);
+ return 0;
+}
+#endif