iop3xx: surface the iop3xx DMA and AAU units to the iop-adma driver

Adds the platform device definitions and the architecture specific support
routines (i.e. register initialization and descriptor formats) for the
iop-adma driver.

Changelog:
* add support for > 1k zero sum buffer sizes
* added dma/aau platform devices to iq80321 and iq80332 setup
* fixed the calculation in iop_desc_is_aligned
* support xor buffer sizes larger than 16MB
* fix places where software descriptors are assumed to be contiguous, only
  hardware descriptors are contiguous for up to a PAGE_SIZE buffer size
* convert to async_tx
* add interrupt support
* add platform devices for 80219 boards
* do not call platform register macros in driver code
* remove switch() statements for compatible register offsets/layouts
* change over to bitmap based capabilities
* remove unnecessary ARM assembly statement
* checkpatch.pl fixes
* gpl v2 only correction
* phys move to dma_async_tx_descriptor

Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 892 insertions, 0 deletions

diff --git a/include/asm-arm/hardware/iop3xx-adma.h b/include/asm-arm/hardware/iop3xx-adma.h
new file mode 100644
index 000000000000..10834b54f681
--- /dev/null
+++ b/include/asm-arm/hardware/iop3xx-adma.h
@@ -0,0 +1,892 @@
+/*
+ * Copyright © 2006, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#ifndef _ADMA_H
+#define _ADMA_H
+#include <linux/types.h>
+#include <linux/io.h>
+#include <asm/hardware.h>
+#include <asm/hardware/iop_adma.h>
+
+/* Memory copy units */
+#define DMA_CCR(chan)           (chan->mmr_base + 0x0)
+#define DMA_CSR(chan)           (chan->mmr_base + 0x4)
+#define DMA_DAR(chan)           (chan->mmr_base + 0xc)
+#define DMA_NDAR(chan)          (chan->mmr_base + 0x10)
+#define DMA_PADR(chan)          (chan->mmr_base + 0x14)
+#define DMA_PUADR(chan) (chan->mmr_base + 0x18)
+#define DMA_LADR(chan)          (chan->mmr_base + 0x1c)
+#define DMA_BCR(chan)           (chan->mmr_base + 0x20)
+#define DMA_DCR(chan)           (chan->mmr_base + 0x24)
+
+/* Application accelerator unit  */
+#define AAU_ACR(chan)           (chan->mmr_base + 0x0)
+#define AAU_ASR(chan)           (chan->mmr_base + 0x4)
+#define AAU_ADAR(chan)          (chan->mmr_base + 0x8)
+#define AAU_ANDAR(chan) (chan->mmr_base + 0xc)
+#define AAU_SAR(src, chan)      (chan->mmr_base + (0x10 + ((src) << 2)))
+#define AAU_DAR(chan)           (chan->mmr_base + 0x20)
+#define AAU_ABCR(chan)          (chan->mmr_base + 0x24)
+#define AAU_ADCR(chan)          (chan->mmr_base + 0x28)
+#define AAU_SAR_EDCR(src_edc)   (chan->mmr_base + (0x02c + ((src_edc-4) << 2)))
+#define AAU_EDCR0_IDX   8
+#define AAU_EDCR1_IDX   17
+#define AAU_EDCR2_IDX   26
+
+#define DMA0_ID 0
+#define DMA1_ID 1
+#define AAU_ID 2
+
+struct iop3xx_aau_desc_ctrl {
+        unsigned int int_en:1;
+        unsigned int blk1_cmd_ctrl:3;
+        unsigned int blk2_cmd_ctrl:3;
+        unsigned int blk3_cmd_ctrl:3;
+        unsigned int blk4_cmd_ctrl:3;
+        unsigned int blk5_cmd_ctrl:3;
+        unsigned int blk6_cmd_ctrl:3;
+        unsigned int blk7_cmd_ctrl:3;
+        unsigned int blk8_cmd_ctrl:3;
+        unsigned int blk_ctrl:2;
+        unsigned int dual_xor_en:1;
+        unsigned int tx_complete:1;
+        unsigned int zero_result_err:1;
+        unsigned int zero_result_en:1;
+        unsigned int dest_write_en:1;
+};
+
+struct iop3xx_aau_e_desc_ctrl {
+        unsigned int reserved:1;
+        unsigned int blk1_cmd_ctrl:3;
+        unsigned int blk2_cmd_ctrl:3;
+        unsigned int blk3_cmd_ctrl:3;
+        unsigned int blk4_cmd_ctrl:3;
+        unsigned int blk5_cmd_ctrl:3;
+        unsigned int blk6_cmd_ctrl:3;
+        unsigned int blk7_cmd_ctrl:3;
+        unsigned int blk8_cmd_ctrl:3;
+        unsigned int reserved2:7;
+};
+
+struct iop3xx_dma_desc_ctrl {
+        unsigned int pci_transaction:4;
+        unsigned int int_en:1;
+        unsigned int dac_cycle_en:1;
+        unsigned int mem_to_mem_en:1;
+        unsigned int crc_data_tx_en:1;
+        unsigned int crc_gen_en:1;
+        unsigned int crc_seed_dis:1;
+        unsigned int reserved:21;
+        unsigned int crc_tx_complete:1;
+};
+
+struct iop3xx_desc_dma {
+        u32 next_desc;
+        union {
+                u32 pci_src_addr;
+                u32 pci_dest_addr;
+                u32 src_addr;
+        };
+        union {
+                u32 upper_pci_src_addr;
+                u32 upper_pci_dest_addr;
+        };
+        union {
+                u32 local_pci_src_addr;
+                u32 local_pci_dest_addr;
+                u32 dest_addr;
+        };
+        u32 byte_count;
+        union {
+                u32 desc_ctrl;
+                struct iop3xx_dma_desc_ctrl desc_ctrl_field;
+        };
+        u32 crc_addr;
+};
+
+struct iop3xx_desc_aau {
+        u32 next_desc;
+        u32 src[4];
+        u32 dest_addr;
+        u32 byte_count;
+        union {
+                u32 desc_ctrl;
+                struct iop3xx_aau_desc_ctrl desc_ctrl_field;
+        };
+        union {
+                u32 src_addr;
+                u32 e_desc_ctrl;
+                struct iop3xx_aau_e_desc_ctrl e_desc_ctrl_field;
+        } src_edc[31];
+};
+
+struct iop3xx_aau_gfmr {
+        unsigned int gfmr1:8;
+        unsigned int gfmr2:8;
+        unsigned int gfmr3:8;
+        unsigned int gfmr4:8;
+};
+
+struct iop3xx_desc_pq_xor {
+        u32 next_desc;
+        u32 src[3];
+        union {
+                u32 data_mult1;
+                struct iop3xx_aau_gfmr data_mult1_field;
+        };
+        u32 dest_addr;
+        u32 byte_count;
+        union {
+                u32 desc_ctrl;
+                struct iop3xx_aau_desc_ctrl desc_ctrl_field;
+        };
+        union {
+                u32 src_addr;
+                u32 e_desc_ctrl;
+                struct iop3xx_aau_e_desc_ctrl e_desc_ctrl_field;
+                u32 data_multiplier;
+                struct iop3xx_aau_gfmr data_mult_field;
+                u32 reserved;
+        } src_edc_gfmr[19];
+};
+
+struct iop3xx_desc_dual_xor {
+        u32 next_desc;
+        u32 src0_addr;
+        u32 src1_addr;
+        u32 h_src_addr;
+        u32 d_src_addr;
+        u32 h_dest_addr;
+        u32 byte_count;
+        union {
+                u32 desc_ctrl;
+                struct iop3xx_aau_desc_ctrl desc_ctrl_field;
+        };
+        u32 d_dest_addr;
+};
+
+union iop3xx_desc {
+        struct iop3xx_desc_aau *aau;
+        struct iop3xx_desc_dma *dma;
+        struct iop3xx_desc_pq_xor *pq_xor;
+        struct iop3xx_desc_dual_xor *dual_xor;
+        void *ptr;
+};
+
+static inline int iop_adma_get_max_xor(void)
+{
+        return 32;
+}
+
+static inline u32 iop_chan_get_current_descriptor(struct iop_adma_chan *chan)
+{
+        int id = chan->device->id;
+
+        switch (id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                return __raw_readl(DMA_DAR(chan));
+        case AAU_ID:
+                return __raw_readl(AAU_ADAR(chan));
+        default:
+                BUG();
+        }
+        return 0;
+}
+
+static inline void iop_chan_set_next_descriptor(struct iop_adma_chan *chan,
+                                                u32 next_desc_addr)
+{
+        int id = chan->device->id;
+
+        switch (id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                __raw_writel(next_desc_addr, DMA_NDAR(chan));
+                break;
+        case AAU_ID:
+                __raw_writel(next_desc_addr, AAU_ANDAR(chan));
+                break;
+        }
+
+}
+
+#define IOP_ADMA_STATUS_BUSY (1 << 10)
+#define IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT (1024)
+#define IOP_ADMA_XOR_MAX_BYTE_COUNT (16 * 1024 * 1024)
+#define IOP_ADMA_MAX_BYTE_COUNT (16 * 1024 * 1024)
+
+static inline int iop_chan_is_busy(struct iop_adma_chan *chan)
+{
+        u32 status = __raw_readl(DMA_CSR(chan));
+        return (status & IOP_ADMA_STATUS_BUSY) ? 1 : 0;
+}
+
+static inline int iop_desc_is_aligned(struct iop_adma_desc_slot *desc,
+                                        int num_slots)
+{
+        /* num_slots will only ever be 1, 2, 4, or 8 */
+        return (desc->idx & (num_slots - 1)) ? 0 : 1;
+}
+
+/* to do: support large (i.e. > hw max) buffer sizes */
+static inline int iop_chan_memcpy_slot_count(size_t len, int *slots_per_op)
+{
+        *slots_per_op = 1;
+        return 1;
+}
+
+/* to do: support large (i.e. > hw max) buffer sizes */
+static inline int iop_chan_memset_slot_count(size_t len, int *slots_per_op)
+{
+        *slots_per_op = 1;
+        return 1;
+}
+
+static inline int iop3xx_aau_xor_slot_count(size_t len, int src_cnt,
+                                        int *slots_per_op)
+{
+        const static int slot_count_table[] = { 0,
+                                                1, 1, 1, 1, /* 01 - 04 */
+                                                2, 2, 2, 2, /* 05 - 08 */
+                                                4, 4, 4, 4, /* 09 - 12 */
+                                                4, 4, 4, 4, /* 13 - 16 */
+                                                8, 8, 8, 8, /* 17 - 20 */
+                                                8, 8, 8, 8, /* 21 - 24 */
+                                                8, 8, 8, 8, /* 25 - 28 */
+                                                8, 8, 8, 8, /* 29 - 32 */
+                                              };
+        *slots_per_op = slot_count_table[src_cnt];
+        return *slots_per_op;
+}
+
+static inline int
+iop_chan_interrupt_slot_count(int *slots_per_op, struct iop_adma_chan *chan)
+{
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                return iop_chan_memcpy_slot_count(0, slots_per_op);
+        case AAU_ID:
+                return iop3xx_aau_xor_slot_count(0, 2, slots_per_op);
+        default:
+                BUG();
+        }
+        return 0;
+}
+
+static inline int iop_chan_xor_slot_count(size_t len, int src_cnt,
+                                                int *slots_per_op)
+{
+        int slot_cnt = iop3xx_aau_xor_slot_count(len, src_cnt, slots_per_op);
+
+        if (len <= IOP_ADMA_XOR_MAX_BYTE_COUNT)
+                return slot_cnt;
+
+        len -= IOP_ADMA_XOR_MAX_BYTE_COUNT;
+        while (len > IOP_ADMA_XOR_MAX_BYTE_COUNT) {
+                len -= IOP_ADMA_XOR_MAX_BYTE_COUNT;
+                slot_cnt += *slots_per_op;
+        }
+
+        if (len)
+                slot_cnt += *slots_per_op;
+
+        return slot_cnt;
+}
+
+/* zero sum on iop3xx is limited to 1k at a time so it requires multiple
+ * descriptors
+ */
+static inline int iop_chan_zero_sum_slot_count(size_t len, int src_cnt,
+                                                int *slots_per_op)
+{
+        int slot_cnt = iop3xx_aau_xor_slot_count(len, src_cnt, slots_per_op);
+
+        if (len <= IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT)
+                return slot_cnt;
+
+        len -= IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT;
+        while (len > IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT) {
+                len -= IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT;
+                slot_cnt += *slots_per_op;
+        }
+
+        if (len)
+                slot_cnt += *slots_per_op;
+
+        return slot_cnt;
+}
+
+static inline u32 iop_desc_get_dest_addr(struct iop_adma_desc_slot *desc,
+                                        struct iop_adma_chan *chan)
+{
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                return hw_desc.dma->dest_addr;
+        case AAU_ID:
+                return hw_desc.aau->dest_addr;
+        default:
+                BUG();
+        }
+        return 0;
+}
+
+static inline u32 iop_desc_get_byte_count(struct iop_adma_desc_slot *desc,
+                                        struct iop_adma_chan *chan)
+{
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                return hw_desc.dma->byte_count;
+        case AAU_ID:
+                return hw_desc.aau->byte_count;
+        default:
+                BUG();
+        }
+        return 0;
+}
+
+/* translate the src_idx to a descriptor word index */
+static inline int __desc_idx(int src_idx)
+{
+        const static int desc_idx_table[] = { 0, 0, 0, 0,
+                                              0, 1, 2, 3,
+                                              5, 6, 7, 8,
+                                              9, 10, 11, 12,
+                                              14, 15, 16, 17,
+                                              18, 19, 20, 21,
+                                              23, 24, 25, 26,
+                                              27, 28, 29, 30,
+                                            };
+
+        return desc_idx_table[src_idx];
+}
+
+static inline u32 iop_desc_get_src_addr(struct iop_adma_desc_slot *desc,
+                                        struct iop_adma_chan *chan,
+                                        int src_idx)
+{
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                return hw_desc.dma->src_addr;
+        case AAU_ID:
+                break;
+        default:
+                BUG();
+        }
+
+        if (src_idx < 4)
+                return hw_desc.aau->src[src_idx];
+        else
+                return hw_desc.aau->src_edc[__desc_idx(src_idx)].src_addr;
+}
+
+static inline void iop3xx_aau_desc_set_src_addr(struct iop3xx_desc_aau *hw_desc,
+                                        int src_idx, dma_addr_t addr)
+{
+        if (src_idx < 4)
+                hw_desc->src[src_idx] = addr;
+        else
+                hw_desc->src_edc[__desc_idx(src_idx)].src_addr = addr;
+}
+
+static inline void
+iop_desc_init_memcpy(struct iop_adma_desc_slot *desc, int int_en)
+{
+        struct iop3xx_desc_dma *hw_desc = desc->hw_desc;
+        union {
+                u32 value;
+                struct iop3xx_dma_desc_ctrl field;
+        } u_desc_ctrl;
+
+        u_desc_ctrl.value = 0;
+        u_desc_ctrl.field.mem_to_mem_en = 1;
+        u_desc_ctrl.field.pci_transaction = 0xe; /* memory read block */
+        u_desc_ctrl.field.int_en = int_en;
+        hw_desc->desc_ctrl = u_desc_ctrl.value;
+        hw_desc->upper_pci_src_addr = 0;
+        hw_desc->crc_addr = 0;
+}
+
+static inline void
+iop_desc_init_memset(struct iop_adma_desc_slot *desc, int int_en)
+{
+        struct iop3xx_desc_aau *hw_desc = desc->hw_desc;
+        union {
+                u32 value;
+                struct iop3xx_aau_desc_ctrl field;
+        } u_desc_ctrl;
+
+        u_desc_ctrl.value = 0;
+        u_desc_ctrl.field.blk1_cmd_ctrl = 0x2; /* memory block fill */
+        u_desc_ctrl.field.dest_write_en = 1;
+        u_desc_ctrl.field.int_en = int_en;
+        hw_desc->desc_ctrl = u_desc_ctrl.value;
+}
+
+static inline u32
+iop3xx_desc_init_xor(struct iop3xx_desc_aau *hw_desc, int src_cnt, int int_en)
+{
+        int i, shift;
+        u32 edcr;
+        union {
+                u32 value;
+                struct iop3xx_aau_desc_ctrl field;
+        } u_desc_ctrl;
+
+        u_desc_ctrl.value = 0;
+        switch (src_cnt) {
+        case 25 ... 32:
+                u_desc_ctrl.field.blk_ctrl = 0x3; /* use EDCR[2:0] */
+                edcr = 0;
+                shift = 1;
+                for (i = 24; i < src_cnt; i++) {
+                        edcr |= (1 << shift);
+                        shift += 3;
+                }
+                hw_desc->src_edc[AAU_EDCR2_IDX].e_desc_ctrl = edcr;
+                src_cnt = 24;
+                /* fall through */
+        case 17 ... 24:
+                if (!u_desc_ctrl.field.blk_ctrl) {
+                        hw_desc->src_edc[AAU_EDCR2_IDX].e_desc_ctrl = 0;
+                        u_desc_ctrl.field.blk_ctrl = 0x3; /* use EDCR[2:0] */
+                }
+                edcr = 0;
+                shift = 1;
+                for (i = 16; i < src_cnt; i++) {
+                        edcr |= (1 << shift);
+                        shift += 3;
+                }
+                hw_desc->src_edc[AAU_EDCR1_IDX].e_desc_ctrl = edcr;
+                src_cnt = 16;
+                /* fall through */
+        case 9 ... 16:
+                if (!u_desc_ctrl.field.blk_ctrl)
+                        u_desc_ctrl.field.blk_ctrl = 0x2; /* use EDCR0 */
+                edcr = 0;
+                shift = 1;
+                for (i = 8; i < src_cnt; i++) {
+                        edcr |= (1 << shift);
+                        shift += 3;
+                }
+                hw_desc->src_edc[AAU_EDCR0_IDX].e_desc_ctrl = edcr;
+                src_cnt = 8;
+                /* fall through */
+        case 2 ... 8:
+                shift = 1;
+                for (i = 0; i < src_cnt; i++) {
+                        u_desc_ctrl.value |= (1 << shift);
+                        shift += 3;
+                }
+
+                if (!u_desc_ctrl.field.blk_ctrl && src_cnt > 4)
+                        u_desc_ctrl.field.blk_ctrl = 0x1; /* use mini-desc */
+        }
+
+        u_desc_ctrl.field.dest_write_en = 1;
+        u_desc_ctrl.field.blk1_cmd_ctrl = 0x7; /* direct fill */
+        u_desc_ctrl.field.int_en = int_en;
+        hw_desc->desc_ctrl = u_desc_ctrl.value;
+
+        return u_desc_ctrl.value;
+}
+
+static inline void
+iop_desc_init_xor(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
+{
+        iop3xx_desc_init_xor(desc->hw_desc, src_cnt, int_en);
+}
+
+/* return the number of operations */
+static inline int
+iop_desc_init_zero_sum(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
+{
+        int slot_cnt = desc->slot_cnt, slots_per_op = desc->slots_per_op;
+        struct iop3xx_desc_aau *hw_desc, *prev_hw_desc, *iter;
+        union {
+                u32 value;
+                struct iop3xx_aau_desc_ctrl field;
+        } u_desc_ctrl;
+        int i, j;
+
+        hw_desc = desc->hw_desc;
+
+        for (i = 0, j = 0; (slot_cnt -= slots_per_op) >= 0;
+                i += slots_per_op, j++) {
+                iter = iop_hw_desc_slot_idx(hw_desc, i);
+                u_desc_ctrl.value = iop3xx_desc_init_xor(iter, src_cnt, int_en);
+                u_desc_ctrl.field.dest_write_en = 0;
+                u_desc_ctrl.field.zero_result_en = 1;
+                u_desc_ctrl.field.int_en = int_en;
+                iter->desc_ctrl = u_desc_ctrl.value;
+
+                /* for the subsequent descriptors preserve the store queue
+                 * and chain them together
+                 */
+                if (i) {
+                        prev_hw_desc =
+                                iop_hw_desc_slot_idx(hw_desc, i - slots_per_op);
+                        prev_hw_desc->next_desc =
+                                (u32) (desc->async_tx.phys + (i << 5));
+                }
+        }
+
+        return j;
+}
+
+static inline void
+iop_desc_init_null_xor(struct iop_adma_desc_slot *desc, int src_cnt, int int_en)
+{
+        struct iop3xx_desc_aau *hw_desc = desc->hw_desc;
+        union {
+                u32 value;
+                struct iop3xx_aau_desc_ctrl field;
+        } u_desc_ctrl;
+
+        u_desc_ctrl.value = 0;
+        switch (src_cnt) {
+        case 25 ... 32:
+                u_desc_ctrl.field.blk_ctrl = 0x3; /* use EDCR[2:0] */
+                hw_desc->src_edc[AAU_EDCR2_IDX].e_desc_ctrl = 0;
+                /* fall through */
+        case 17 ... 24:
+                if (!u_desc_ctrl.field.blk_ctrl) {
+                        hw_desc->src_edc[AAU_EDCR2_IDX].e_desc_ctrl = 0;
+                        u_desc_ctrl.field.blk_ctrl = 0x3; /* use EDCR[2:0] */
+                }
+                hw_desc->src_edc[AAU_EDCR1_IDX].e_desc_ctrl = 0;
+                /* fall through */
+        case 9 ... 16:
+                if (!u_desc_ctrl.field.blk_ctrl)
+                        u_desc_ctrl.field.blk_ctrl = 0x2; /* use EDCR0 */
+                hw_desc->src_edc[AAU_EDCR0_IDX].e_desc_ctrl = 0;
+                /* fall through */
+        case 1 ... 8:
+                if (!u_desc_ctrl.field.blk_ctrl && src_cnt > 4)
+                        u_desc_ctrl.field.blk_ctrl = 0x1; /* use mini-desc */
+        }
+
+        u_desc_ctrl.field.dest_write_en = 0;
+        u_desc_ctrl.field.int_en = int_en;
+        hw_desc->desc_ctrl = u_desc_ctrl.value;
+}
+
+static inline void iop_desc_set_byte_count(struct iop_adma_desc_slot *desc,
+                                        struct iop_adma_chan *chan,
+                                        u32 byte_count)
+{
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                hw_desc.dma->byte_count = byte_count;
+                break;
+        case AAU_ID:
+                hw_desc.aau->byte_count = byte_count;
+                break;
+        default:
+                BUG();
+        }
+}
+
+static inline void
+iop_desc_init_interrupt(struct iop_adma_desc_slot *desc,
+                        struct iop_adma_chan *chan)
+{
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                iop_desc_init_memcpy(desc, 1);
+                hw_desc.dma->byte_count = 0;
+                hw_desc.dma->dest_addr = 0;
+                hw_desc.dma->src_addr = 0;
+                break;
+        case AAU_ID:
+                iop_desc_init_null_xor(desc, 2, 1);
+                hw_desc.aau->byte_count = 0;
+                hw_desc.aau->dest_addr = 0;
+                hw_desc.aau->src[0] = 0;
+                hw_desc.aau->src[1] = 0;
+                break;
+        default:
+                BUG();
+        }
+}
+
+static inline void
+iop_desc_set_zero_sum_byte_count(struct iop_adma_desc_slot *desc, u32 len)
+{
+        int slots_per_op = desc->slots_per_op;
+        struct iop3xx_desc_aau *hw_desc = desc->hw_desc, *iter;
+        int i = 0;
+
+        if (len <= IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT) {
+                hw_desc->byte_count = len;
+        } else {
+                do {
+                        iter = iop_hw_desc_slot_idx(hw_desc, i);
+                        iter->byte_count = IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT;
+                        len -= IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT;
+                        i += slots_per_op;
+                } while (len > IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT);
+
+                if (len) {
+                        iter = iop_hw_desc_slot_idx(hw_desc, i);
+                        iter->byte_count = len;
+                }
+        }
+}
+
+static inline void iop_desc_set_dest_addr(struct iop_adma_desc_slot *desc,
+                                        struct iop_adma_chan *chan,
+                                        dma_addr_t addr)
+{
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                hw_desc.dma->dest_addr = addr;
+                break;
+        case AAU_ID:
+                hw_desc.aau->dest_addr = addr;
+                break;
+        default:
+                BUG();
+        }
+}
+
+static inline void iop_desc_set_memcpy_src_addr(struct iop_adma_desc_slot *desc,
+                                        dma_addr_t addr)
+{
+        struct iop3xx_desc_dma *hw_desc = desc->hw_desc;
+        hw_desc->src_addr = addr;
+}
+
+static inline void
+iop_desc_set_zero_sum_src_addr(struct iop_adma_desc_slot *desc, int src_idx,
+                                dma_addr_t addr)
+{
+
+        struct iop3xx_desc_aau *hw_desc = desc->hw_desc, *iter;
+        int slot_cnt = desc->slot_cnt, slots_per_op = desc->slots_per_op;
+        int i;
+
+        for (i = 0; (slot_cnt -= slots_per_op) >= 0;
+                i += slots_per_op, addr += IOP_ADMA_ZERO_SUM_MAX_BYTE_COUNT) {
+                iter = iop_hw_desc_slot_idx(hw_desc, i);
+                iop3xx_aau_desc_set_src_addr(iter, src_idx, addr);
+        }
+}
+
+static inline void iop_desc_set_xor_src_addr(struct iop_adma_desc_slot *desc,
+                                        int src_idx, dma_addr_t addr)
+{
+
+        struct iop3xx_desc_aau *hw_desc = desc->hw_desc, *iter;
+        int slot_cnt = desc->slot_cnt, slots_per_op = desc->slots_per_op;
+        int i;
+
+        for (i = 0; (slot_cnt -= slots_per_op) >= 0;
+                i += slots_per_op, addr += IOP_ADMA_XOR_MAX_BYTE_COUNT) {
+                iter = iop_hw_desc_slot_idx(hw_desc, i);
+                iop3xx_aau_desc_set_src_addr(iter, src_idx, addr);
+        }
+}
+
+static inline void iop_desc_set_next_desc(struct iop_adma_desc_slot *desc,
+                                        u32 next_desc_addr)
+{
+        /* hw_desc->next_desc is the same location for all channels */
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+        BUG_ON(hw_desc.dma->next_desc);
+        hw_desc.dma->next_desc = next_desc_addr;
+}
+
+static inline u32 iop_desc_get_next_desc(struct iop_adma_desc_slot *desc)
+{
+        /* hw_desc->next_desc is the same location for all channels */
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+        return hw_desc.dma->next_desc;
+}
+
+static inline void iop_desc_clear_next_desc(struct iop_adma_desc_slot *desc)
+{
+        /* hw_desc->next_desc is the same location for all channels */
+        union iop3xx_desc hw_desc = { .ptr = desc->hw_desc, };
+        hw_desc.dma->next_desc = 0;
+}
+
+static inline void iop_desc_set_block_fill_val(struct iop_adma_desc_slot *desc,
+                                                u32 val)
+{
+        struct iop3xx_desc_aau *hw_desc = desc->hw_desc;
+        hw_desc->src[0] = val;
+}
+
+static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
+{
+        struct iop3xx_desc_aau *hw_desc = desc->hw_desc;
+        struct iop3xx_aau_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field;
+
+        BUG_ON(!(desc_ctrl.tx_complete && desc_ctrl.zero_result_en));
+        return desc_ctrl.zero_result_err;
+}
+
+static inline void iop_chan_append(struct iop_adma_chan *chan)
+{
+        u32 dma_chan_ctrl;
+        /* workaround dropped interrupts on 3xx */
+        mod_timer(&chan->cleanup_watchdog, jiffies + msecs_to_jiffies(3));
+
+        dma_chan_ctrl = __raw_readl(DMA_CCR(chan));
+        dma_chan_ctrl |= 0x2;
+        __raw_writel(dma_chan_ctrl, DMA_CCR(chan));
+}
+
+static inline void iop_chan_idle(int busy, struct iop_adma_chan *chan)
+{
+        if (!busy)
+                del_timer(&chan->cleanup_watchdog);
+}
+
+static inline u32 iop_chan_get_status(struct iop_adma_chan *chan)
+{
+        return __raw_readl(DMA_CSR(chan));
+}
+
+static inline void iop_chan_disable(struct iop_adma_chan *chan)
+{
+        u32 dma_chan_ctrl = __raw_readl(DMA_CCR(chan));
+        dma_chan_ctrl &= ~1;
+        __raw_writel(dma_chan_ctrl, DMA_CCR(chan));
+}
+
+static inline void iop_chan_enable(struct iop_adma_chan *chan)
+{
+        u32 dma_chan_ctrl = __raw_readl(DMA_CCR(chan));
+
+        dma_chan_ctrl |= 1;
+        __raw_writel(dma_chan_ctrl, DMA_CCR(chan));
+}
+
+static inline void iop_adma_device_clear_eot_status(struct iop_adma_chan *chan)
+{
+        u32 status = __raw_readl(DMA_CSR(chan));
+        status &= (1 << 9);
+        __raw_writel(status, DMA_CSR(chan));
+}
+
+static inline void iop_adma_device_clear_eoc_status(struct iop_adma_chan *chan)
+{
+        u32 status = __raw_readl(DMA_CSR(chan));
+        status &= (1 << 8);
+        __raw_writel(status, DMA_CSR(chan));
+}
+
+static inline void iop_adma_device_clear_err_status(struct iop_adma_chan *chan)
+{
+        u32 status = __raw_readl(DMA_CSR(chan));
+
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                status &= (1 << 5) | (1 << 3) | (1 << 2) | (1 << 1);
+                break;
+        case AAU_ID:
+                status &= (1 << 5);
+                break;
+        default:
+                BUG();
+        }
+
+        __raw_writel(status, DMA_CSR(chan));
+}
+
+static inline int
+iop_is_err_int_parity(unsigned long status, struct iop_adma_chan *chan)
+{
+        return 0;
+}
+
+static inline int
+iop_is_err_mcu_abort(unsigned long status, struct iop_adma_chan *chan)
+{
+        return 0;
+}
+
+static inline int
+iop_is_err_int_tabort(unsigned long status, struct iop_adma_chan *chan)
+{
+        return 0;
+}
+
+static inline int
+iop_is_err_int_mabort(unsigned long status, struct iop_adma_chan *chan)
+{
+        return test_bit(5, &status);
+}
+
+static inline int
+iop_is_err_pci_tabort(unsigned long status, struct iop_adma_chan *chan)
+{
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                return test_bit(2, &status);
+        default:
+                return 0;
+        }
+}
+
+static inline int
+iop_is_err_pci_mabort(unsigned long status, struct iop_adma_chan *chan)
+{
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                return test_bit(3, &status);
+        default:
+                return 0;
+        }
+}
+
+static inline int
+iop_is_err_split_tx(unsigned long status, struct iop_adma_chan *chan)
+{
+        switch (chan->device->id) {
+        case DMA0_ID:
+        case DMA1_ID:
+                return test_bit(1, &status);
+        default:
+                return 0;
+        }
+}
+#endif /* _ADMA_H */