1 files changed, 160 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/spu_utils.h b/arch/powerpc/platforms/cell/spufs/spu_utils.h
new file mode 100644
index 000000000000..58359feb6c95
--- /dev/null
+++ b/arch/powerpc/platforms/cell/spufs/spu_utils.h
@@ -0,0 +1,160 @@
+/*
+ * utils.h: Utilities for SPU-side of the context switch operation.
+ *
+ * (C) Copyright IBM 2005
+ *
+ * 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, or (at your option)
+ * any later version.
+ *
+ * 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. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _SPU_CONTEXT_UTILS_H_
+#define _SPU_CONTEXT_UTILS_H_
+
+/*
+ * 64-bit safe EA.
+ */
+typedef union {
+        unsigned long long ull;
+        unsigned int ui[2];
+} addr64;
+
+/*
+ * 128-bit register template.
+ */
+typedef union {
+        unsigned int slot[4];
+        vector unsigned int v;
+} spu_reg128v;
+
+/*
+ * DMA list structure.
+ */
+struct dma_list_elem {
+        unsigned int size;
+        unsigned int ea_low;
+};
+
+/*
+ * Declare storage for 8-byte aligned DMA list.
+ */
+struct dma_list_elem dma_list[15] __attribute__ ((aligned(8)));
+
+/*
+ * External definition for storage
+ * declared in crt0.
+ */
+extern spu_reg128v regs_spill[NR_SPU_SPILL_REGS];
+
+/*
+ * Compute LSCSA byte offset for a given field.
+ */
+static struct spu_lscsa *dummy = (struct spu_lscsa *)0;
+#define LSCSA_BYTE_OFFSET(_field)  \
+        ((char *)(&(dummy->_field)) - (char *)(&(dummy->gprs[0].slot[0])))
+#define LSCSA_QW_OFFSET(_field)  (LSCSA_BYTE_OFFSET(_field) >> 4)
+
+static inline void set_event_mask(void)
+{
+        unsigned int event_mask = 0;
+
+        /* Save, Step 4:
+         * Restore, Step 1:
+         *    Set the SPU_RdEventMsk channel to zero to mask
+         *    all events.
+         */
+        spu_writech(SPU_WrEventMask, event_mask);
+}
+
+static inline void set_tag_mask(void)
+{
+        unsigned int tag_mask = 1;
+
+        /* Save, Step 5:
+         * Restore, Step 2:
+         *    Set the SPU_WrTagMsk channel to '01' to unmask
+         *    only tag group 0.
+         */
+        spu_writech(MFC_WrTagMask, tag_mask);
+}
+
+static inline void build_dma_list(addr64 lscsa_ea)
+{
+        unsigned int ea_low;
+        int i;
+
+        /* Save, Step 6:
+         * Restore, Step 3:
+         *    Update the effective address for the CSA in the
+         *    pre-canned DMA-list in local storage.
+         */
+        ea_low = lscsa_ea.ui[1];
+        ea_low += LSCSA_BYTE_OFFSET(ls[16384]);
+
+        for (i = 0; i < 15; i++, ea_low += 16384) {
+                dma_list[i].size = 16384;
+                dma_list[i].ea_low = ea_low;
+        }
+}
+
+static inline void enqueue_putllc(addr64 lscsa_ea)
+{
+        unsigned int ls = 0;
+        unsigned int size = 128;
+        unsigned int tag_id = 0;
+        unsigned int cmd = 0xB4;        /* PUTLLC */
+
+        /* Save, Step 12:
+         * Restore, Step 7:
+         *    Send a PUTLLC (tag 0) command to the MFC using
+         *    an effective address in the CSA in order to
+         *    remove any possible lock-line reservation.
+         */
+        spu_writech(MFC_LSA, ls);
+        spu_writech(MFC_EAH, lscsa_ea.ui[0]);
+        spu_writech(MFC_EAL, lscsa_ea.ui[1]);
+        spu_writech(MFC_Size, size);
+        spu_writech(MFC_TagID, tag_id);
+        spu_writech(MFC_Cmd, cmd);
+}
+
+static inline void set_tag_update(void)
+{
+        unsigned int update_any = 1;
+
+        /* Save, Step 15:
+         * Restore, Step 8:
+         *    Write the MFC_TagUpdate channel with '01'.
+         */
+        spu_writech(MFC_WrTagUpdate, update_any);
+}
+
+static inline void read_tag_status(void)
+{
+        /* Save, Step 16:
+         * Restore, Step 9:
+         *    Read the MFC_TagStat channel data.
+         */
+        spu_readch(MFC_RdTagStat);
+}
+
+static inline void read_llar_status(void)
+{
+        /* Save, Step 17:
+         * Restore, Step 10:
+         *    Read the MFC_AtomicStat channel data.
+         */
+        spu_readch(MFC_RdAtomicStat);
+}
+
+#endif                          /* _SPU_CONTEXT_UTILS_H_ */