summaryrefslogtreecommitdiffstats
path: root/arch/tile/gxio/kiorpc.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/tile/gxio/kiorpc.c')
-rw-r--r--arch/tile/gxio/kiorpc.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/tile/gxio/kiorpc.c b/arch/tile/gxio/kiorpc.c
new file mode 100644
index 0000000..c8096aa
--- /dev/null
+++ b/arch/tile/gxio/kiorpc.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ * 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, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ *
+ * TILE-Gx IORPC support for kernel I/O drivers.
+ */
+
+#include <linux/mmzone.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <gxio/iorpc_globals.h>
+#include <gxio/kiorpc.h>
+
+#ifdef DEBUG_IORPC
+#define TRACE(FMT, ...) pr_info(SIMPLE_MSG_LINE FMT, ## __VA_ARGS__)
+#else
+#define TRACE(...)
+#endif
+
+/* Create kernel-VA-space MMIO mapping for an on-chip IO device. */
+void __iomem *iorpc_ioremap(int hv_fd, resource_size_t offset,
+ unsigned long size)
+{
+ pgprot_t mmio_base, prot = { 0 };
+ unsigned long pfn;
+ int err;
+
+ /* Look up the shim's lotar and base PA. */
+ err = __iorpc_get_mmio_base(hv_fd, &mmio_base);
+ if (err) {
+ TRACE("get_mmio_base() failure: %d\n", err);
+ return NULL;
+ }
+
+ /* Make sure the HV driver approves of our offset and size. */
+ err = __iorpc_check_mmio_offset(hv_fd, offset, size);
+ if (err) {
+ TRACE("check_mmio_offset() failure: %d\n", err);
+ return NULL;
+ }
+
+ /*
+ * mmio_base contains a base pfn and homing coordinates. Turn
+ * it into an MMIO pgprot and offset pfn.
+ */
+ prot = hv_pte_set_lotar(prot, hv_pte_get_lotar(mmio_base));
+ pfn = pte_pfn(mmio_base) + PFN_DOWN(offset);
+
+ return ioremap_prot(PFN_PHYS(pfn), size, prot);
+}
+
+EXPORT_SYMBOL(iorpc_ioremap);