1 files changed, 183 insertions, 0 deletions

diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h
new file mode 100644
index 000000000000..57300fd7cc03
--- /dev/null
+++ b/include/linux/platform_data/edma.h
@@ -0,0 +1,183 @@
+/*
+ *  TI EDMA definitions
+ *
+ *  Copyright (C) 2006-2013 Texas Instruments.
+ *
+ *  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 of the  License, or (at your
+ *  option) any later version.
+ */
+
+/*
+ * This EDMA3 programming framework exposes two basic kinds of resource:
+ *
+ *  Channel     Triggers transfers, usually from a hardware event but
+ *              also manually or by "chaining" from DMA completions.
+ *              Each channel is coupled to a Parameter RAM (PaRAM) slot.
+ *
+ *  Slot        Each PaRAM slot holds a DMA transfer descriptor (PaRAM
+ *              "set"), source and destination addresses, a link to a
+ *              next PaRAM slot (if any), options for the transfer, and
+ *              instructions for updating those addresses.  There are
+ *              more than twice as many slots as event channels.
+ *
+ * Each PaRAM set describes a sequence of transfers, either for one large
+ * buffer or for several discontiguous smaller buffers.  An EDMA transfer
+ * is driven only from a channel, which performs the transfers specified
+ * in its PaRAM slot until there are no more transfers.  When that last
+ * transfer completes, the "link" field may be used to reload the channel's
+ * PaRAM slot with a new transfer descriptor.
+ *
+ * The EDMA Channel Controller (CC) maps requests from channels into physical
+ * Transfer Controller (TC) requests when the channel triggers (by hardware
+ * or software events, or by chaining).  The two physical DMA channels provided
+ * by the TCs are thus shared by many logical channels.
+ *
+ * DaVinci hardware also has a "QDMA" mechanism which is not currently
+ * supported through this interface.  (DSP firmware uses it though.)
+ */
+
+#ifndef EDMA_H_
+#define EDMA_H_
+
+/* PaRAM slots are laid out like this */
+struct edmacc_param {
+        unsigned int opt;
+        unsigned int src;
+        unsigned int a_b_cnt;
+        unsigned int dst;
+        unsigned int src_dst_bidx;
+        unsigned int link_bcntrld;
+        unsigned int src_dst_cidx;
+        unsigned int ccnt;
+};
+
+/* fields in edmacc_param.opt */
+#define SAM             BIT(0)
+#define DAM             BIT(1)
+#define SYNCDIM         BIT(2)
+#define STATIC          BIT(3)
+#define EDMA_FWID       (0x07 << 8)
+#define TCCMODE         BIT(11)
+#define EDMA_TCC(t)     ((t) << 12)
+#define TCINTEN         BIT(20)
+#define ITCINTEN        BIT(21)
+#define TCCHEN          BIT(22)
+#define ITCCHEN         BIT(23)
+
+/*ch_status paramater of callback function possible values*/
+#define DMA_COMPLETE 1
+#define DMA_CC_ERROR 2
+#define DMA_TC1_ERROR 3
+#define DMA_TC2_ERROR 4
+
+enum address_mode {
+        INCR = 0,
+        FIFO = 1
+};
+
+enum fifo_width {
+        W8BIT = 0,
+        W16BIT = 1,
+        W32BIT = 2,
+        W64BIT = 3,
+        W128BIT = 4,
+        W256BIT = 5
+};
+
+enum dma_event_q {
+        EVENTQ_0 = 0,
+        EVENTQ_1 = 1,
+        EVENTQ_2 = 2,
+        EVENTQ_3 = 3,
+        EVENTQ_DEFAULT = -1
+};
+
+enum sync_dimension {
+        ASYNC = 0,
+        ABSYNC = 1
+};
+
+#define EDMA_CTLR_CHAN(ctlr, chan)      (((ctlr) << 16) | (chan))
+#define EDMA_CTLR(i)                    ((i) >> 16)
+#define EDMA_CHAN_SLOT(i)               ((i) & 0xffff)
+
+#define EDMA_CHANNEL_ANY                -1      /* for edma_alloc_channel() */
+#define EDMA_SLOT_ANY                   -1      /* for edma_alloc_slot() */
+#define EDMA_CONT_PARAMS_ANY             1001
+#define EDMA_CONT_PARAMS_FIXED_EXACT     1002
+#define EDMA_CONT_PARAMS_FIXED_NOT_EXACT 1003
+
+#define EDMA_MAX_CC               2
+
+/* alloc/free DMA channels and their dedicated parameter RAM slots */
+int edma_alloc_channel(int channel,
+        void (*callback)(unsigned channel, u16 ch_status, void *data),
+        void *data, enum dma_event_q);
+void edma_free_channel(unsigned channel);
+
+/* alloc/free parameter RAM slots */
+int edma_alloc_slot(unsigned ctlr, int slot);
+void edma_free_slot(unsigned slot);
+
+/* alloc/free a set of contiguous parameter RAM slots */
+int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count);
+int edma_free_cont_slots(unsigned slot, int count);
+
+/* calls that operate on part of a parameter RAM slot */
+void edma_set_src(unsigned slot, dma_addr_t src_port,
+                                enum address_mode mode, enum fifo_width);
+void edma_set_dest(unsigned slot, dma_addr_t dest_port,
+                                 enum address_mode mode, enum fifo_width);
+void edma_get_position(unsigned slot, dma_addr_t *src, dma_addr_t *dst);
+void edma_set_src_index(unsigned slot, s16 src_bidx, s16 src_cidx);
+void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx);
+void edma_set_transfer_params(unsigned slot, u16 acnt, u16 bcnt, u16 ccnt,
+                u16 bcnt_rld, enum sync_dimension sync_mode);
+void edma_link(unsigned from, unsigned to);
+void edma_unlink(unsigned from);
+
+/* calls that operate on an entire parameter RAM slot */
+void edma_write_slot(unsigned slot, const struct edmacc_param *params);
+void edma_read_slot(unsigned slot, struct edmacc_param *params);
+
+/* channel control operations */
+int edma_start(unsigned channel);
+void edma_stop(unsigned channel);
+void edma_clean_channel(unsigned channel);
+void edma_clear_event(unsigned channel);
+void edma_pause(unsigned channel);
+void edma_resume(unsigned channel);
+
+struct edma_rsv_info {
+
+        const s16       (*rsv_chans)[2];
+        const s16       (*rsv_slots)[2];
+};
+
+/* platform_data for EDMA driver */
+struct edma_soc_info {
+
+        /* how many dma resources of each type */
+        unsigned        n_channel;
+        unsigned        n_region;
+        unsigned        n_slot;
+        unsigned        n_tc;
+        unsigned        n_cc;
+        /*
+         * Default queue is expected to be a low-priority queue.
+         * This way, long transfers on the default queue started
+         * by the codec engine will not cause audio defects.
+         */
+        enum dma_event_q        default_queue;
+
+        /* Resource reservation for other cores */
+        struct edma_rsv_info    *rsv;
+
+        s8      (*queue_tc_mapping)[2];
+        s8      (*queue_priority_mapping)[2];
+        const s16       (*xbar_chans)[2];
+};
+
+#endif