unicore32 core architecture: mm related: generic codes

This patch includes generic codes for memory management.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 56 insertions, 0 deletions

diff --git a/arch/unicore32/mm/iomap.c b/arch/unicore32/mm/iomap.c
new file mode 100644
index 0000000..a7e1a3d
--- /dev/null
+++ b/arch/unicore32/mm/iomap.c
@@ -0,0 +1,56 @@
+/*
+ * linux/arch/unicore32/mm/iomap.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Map IO port and PCI memory spaces so that {read,write}[bwl] can
+ * be used to access this memory.
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+
+#ifdef __io
+void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+	/* we map PC lagcy 64K IO port to PCI IO space 0x80030000 */
+	return (void __iomem *) (unsigned long)
+			io_p2v((port & 0xffff) + PKUNITY_PCILIO_BASE);
+}
+EXPORT_SYMBOL(ioport_map);
+
+void ioport_unmap(void __iomem *addr)
+{
+}
+EXPORT_SYMBOL(ioport_unmap);
+#endif
+
+#ifdef CONFIG_PCI
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+	resource_size_t start = pci_resource_start(dev, bar);
+	resource_size_t len   = pci_resource_len(dev, bar);
+	unsigned long flags = pci_resource_flags(dev, bar);
+
+	if (!len || !start)
+		return NULL;
+	if (maxlen && len > maxlen)
+		len = maxlen;
+	if (flags & IORESOURCE_IO)
+		return ioport_map(start, len);
+	if (flags & IORESOURCE_MEM) {
+		if (flags & IORESOURCE_CACHEABLE)
+			return ioremap(start, len);
+		return ioremap_nocache(start, len);
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(pci_iomap);
+#endif