From: Tirumala Marri <[email protected]>
This patch adds new header file which contains common macro
definitions and inline functions.
Signed-off-by: Tirumala R Marri <[email protected]>
---
V1:
* Remove all 440SPe specific references.
* Move some of the code from header file to c file.
---
drivers/dma/ppc4xx/ppc4xx-adma.h | 2424 ++++++++++++++++++++++++++++++++++++++
1 files changed, 2424 insertions(+), 0 deletions(-)
create mode 100644 drivers/dma/ppc4xx/ppc4xx-adma.h
diff --git a/drivers/dma/ppc4xx/ppc4xx-adma.h b/drivers/dma/ppc4xx/ppc4xx-adma.h
new file mode 100644
index 0000000..ae99350
--- /dev/null
+++ b/drivers/dma/ppc4xx/ppc4xx-adma.h
@@ -0,0 +1,2424 @@
+/*
+ * Copyright (C) 2006-2009 DENX Software Engineering.
+ *
+ * Author: Yuri Tikhonov <[email protected]>
+ *
+ * Further porting to arch/powerpc by
+ * Anatolij Gustschin <[email protected]>
+ * Tirumala R Marri <[email protected]>
+ *
+ * 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 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., 59
+ * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called COPYING.
+ */
+#ifndef __PPC4XX_ADMA_H
+#define __PPC4XX_ADMA_H
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <asm/dcr.h>
+#include <asm/dcr-regs.h>
+#include "adma.h"
+#if defined(CONFIG_440SPe) || defined(CONFIG_440SP)
+#include "ppc440spe-dma.h"
+#endif
+
+#define PPC4XX_ADMA_DMA_MAX_BYTE_COUNT 0xFFFFFFUL
+/* this is the XOR_CBBCR width */
+#define PPC4XX_ADMA_XOR_MAX_BYTE_COUNT (1 << 31)
+#define PPC4XX_ADMA_ZERO_SUM_MAX_BYTE_COUNT PPC4XX_ADMA_XOR_MAX_BYTE_COUNT
+#define PPC4XX_ADMA_ENGINES_NUM (XOR_ENGINES_NUM + DMA_ENGINES_NUM)
+#define PPC4XX_ADMA_THRESHOLD 1
+#ifdef ADMA_LL_DEBUG
+#define ADMA_LL_DBG(x) ({ if (1) x; 0; })
+#else
+#define ADMA_LL_DBG(x) ({ if (0) x; 0; })
+#endif
+
+#define PPC4XX_DMA0_ID 0
+#define PPC4XX_DMA1_ID 1
+#define PPC4XX_XOR_ID 2
+/* Default polynomial (for 440SP is only available) */
+#define PPC4XX_DEFAULT_POLY 0x4d
+#define PPC4XX_ADMA_WATCHDOG_MSEC 3
+#define PPC4XX_RXOR_RUN 0
+#define MQ0_CF2H_RXOR_BS_MASK 0x1FF
+#define PPC4XX_DESC_INT 0 /* generate interrupt on complete */
+#define PPC4XX_ZERO_P 1 /* clear P destionaion */
+#define PPC4XX_ZERO_Q 2 /* clear Q destination */
+#define PPC4XX_COHERENT 3 /* src/dst are coherent */
+#define PPC4XX_DESC_WXOR 4 /* WXORs are in chain */
+#define PPC4XX_DESC_RXOR 5 /* RXOR is in chain */
+#define PPC4XX_DESC_RXOR123 8 /* CDB for RXOR123 operation */
+#define PPC4XX_DESC_RXOR124 9 /* CDB for RXOR124 operation */
+#define PPC4XX_DESC_RXOR125 10 /* CDB for RXOR125 operation */
+#define PPC4XX_DESC_RXOR12 11 /* CDB for RXOR12 operation */
+#define PPC4XX_DESC_RXOR_REV 12 /* CDB has srcs in reversed order */
+#define PPC4XX_DESC_PCHECK 13
+#define PPC4XX_DESC_QCHECK 14
+#define PPC4XX_DESC_RXOR_MSK 0x3
+
+enum ppc_adma_init_code {
+ PPC_ADMA_INIT_OK = 0,
+ PPC_ADMA_INIT_MEMRES,
+ PPC_ADMA_INIT_MEMREG,
+ PPC_ADMA_INIT_ALLOC,
+ PPC_ADMA_INIT_COHERENT,
+ PPC_ADMA_INIT_CHANNEL,
+ PPC_ADMA_INIT_IRQ1,
+ PPC_ADMA_INIT_IRQ2,
+ PPC_ADMA_INIT_REGISTER
+};
+
+/* This flag is set when want to refetch the xor chain in the interrupt
+ * handler
+ */
+static u32 do_xor_refetch;
+static struct ppc4xx_adma_chan *ppc4xx_r6_tchan;
+/* Since RXOR operations use the common register (MQ0_CF2H) for setting-up
+ * the block size in transactions, then we do not allow to activate more than
+ * only one RXOR transactions simultaneously. So use this var to store
+ * the information about is RXOR currently active (PPC4XX_RXOR_RUN bit is
+ * set) or not (PPC4XX_RXOR_RUN is clear).
+ */
+static unsigned long ppc4xx_rxor_state;
+
+/* Pointer to last linked and submitted xor CB */
+static struct ppc4xx_adma_desc_slot *xor_last_linked;
+static struct ppc4xx_adma_desc_slot *xor_last_submit;
+
+
+/* Pointers to last submitted to DMA0, DMA1 CDBs */
+static struct ppc4xx_adma_desc_slot *chan_last_sub[3];
+static struct ppc4xx_adma_desc_slot *chan_first_cdb[3];
+
+/* The list of channels exported by ppc4xx ADMA */
+static struct list_head ppc4xx_adma_chan_list =
+LIST_HEAD_INIT(ppc4xx_adma_chan_list);
+
+static int ppc4xx_adma_devices[PPC4XX_ADMA_ENGINES_NUM];
+static struct of_platform_driver ppc4xx_adma_driver;
+
+#if defined(CONFIG_440SPe) || defined(CONFIG_440SP)
+static const struct of_device_id ppc4xx_adma_of_match[] __devinitconst = {
+ {.compatible = "ibm,dma-440spe",},
+ {.compatible = "amcc,xor-accelerator",},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, ppc4xx_adma_of_match);
+#endif
+
+
+
+irqreturn_t ppc4xx_adma_eot_handler(int irq, void *data);
+irqreturn_t ppc4xx_adma_err_handler(int irq, void *data);
+
+void ppc4xx_adma_issue_pending(struct dma_chan *chan);
+struct ppc4xx_adma_desc_slot *ppc4xx_adma_alloc_slots(struct
+ ppc4xx_adma_chan
+ *chan,
+ int num_slots,
+ int slots_per_op);
+void ppc4xx_adma_free_slots(struct ppc4xx_adma_desc_slot *slot,
+ struct ppc4xx_adma_chan *chan);
+dma_cookie_t ppc4xx_adma_tx_submit(struct dma_async_tx_descriptor *tx);
+void ppc4xx_chan_start_null_xor(struct ppc4xx_adma_chan *chan);
+void prep_dma_pqzero_sum_dbg(int id, dma_addr_t * src,
+ unsigned int src_cnt, const unsigned char *scf);
+/*
+ * ppc4xx_get_group_entry - get group entry with index idx
+ * @tdesc: is the last allocated slot in the group.
+ */
+static struct ppc4xx_adma_desc_slot *ppc4xx_get_group_entry(struct
+ ppc4xx_adma_desc_slot
+ *tdesc,
+ u32 entry_idx)
+{
+ struct ppc4xx_adma_desc_slot *iter = tdesc->group_head;
+ int i = 0;
+
+ if (entry_idx < 0 || entry_idx >= (tdesc->src_cnt + tdesc->dst_cnt)) {
+ printk("%s: entry_idx %d, src_cnt %d, dst_cnt %d\n",
+ __func__, entry_idx, tdesc->src_cnt, tdesc->dst_cnt);
+ BUG();
+ }
+
+ list_for_each_entry(iter, &tdesc->group_list, chain_node) {
+ if (i++ == entry_idx)
+ break;
+ }
+ return iter;
+}
+
+static inline void print_cb(struct ppc4xx_adma_chan *chan, void *block)
+{
+ struct dma_cdb *cdb;
+ struct xor_cb *cb;
+ int i;
+
+ switch (chan->device->id) {
+ case 0:
+ case 1:
+ cdb = block;
+
+ pr_debug("CDB at %p [%d]:\n"
+ "\t attr 0x%02x opc 0x%02x cnt 0x%08x\n"
+ "\t sg1u 0x%08x sg1l 0x%08x\n"
+ "\t sg2u 0x%08x sg2l 0x%08x\n"
+ "\t sg3u 0x%08x sg3l 0x%08x\n",
+ cdb, chan->device->id,
+ cdb->attr, cdb->opc, le32_to_cpu(cdb->cnt),
+ le32_to_cpu(cdb->sg1u), le32_to_cpu(cdb->sg1l),
+ le32_to_cpu(cdb->sg2u), le32_to_cpu(cdb->sg2l),
+ le32_to_cpu(cdb->sg3u), le32_to_cpu(cdb->sg3l)
+ );
+ break;
+ case 2:
+ cb = block;
+
+ pr_debug("CB at %p [%d]:\n"
+ "\t cbc 0x%08x cbbc 0x%08x cbs 0x%08x\n"
+ "\t cbtah 0x%08x cbtal 0x%08x\n"
+ "\t cblah 0x%08x cblal 0x%08x\n",
+ cb, chan->device->id,
+ cb->cbc, cb->cbbc, cb->cbs,
+ cb->cbtah, cb->cbtal, cb->cblah, cb->cblal);
+ for (i = 0; i < 16; i++) {
+ if (i && !cb->ops[i].h && !cb->ops[i].l)
+ continue;
+ pr_debug("\t ops[%2d]: h 0x%08x l 0x%08x\n",
+ i, cb->ops[i].h, cb->ops[i].l);
+ }
+ break;
+ }
+}
+
+/******************************************************************************
+ * Command (Descriptor) Blocks low-level routines
+ ******************************************************************************/
+/**
+ * ppc4xx_desc_init_interrupt - initialize the descriptor for INTERRUPT
+ * pseudo operation
+ */
+static inline void ppc4xx_desc_init_interrupt(struct ppc4xx_adma_desc_slot
+ *desc,
+ struct ppc4xx_adma_chan *chan)
+{
+ struct xor_cb *p;
+
+ switch (chan->device->id) {
+ case PPC4XX_XOR_ID:
+ p = desc->hw_desc;
+ memset(desc->hw_desc, 0, sizeof(struct xor_cb));
+ /* NOP with Command Block Complete Enable */
+ p->cbc = XOR_CBCR_CBCE_BIT;
+ break;
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ memset(desc->hw_desc, 0, sizeof(struct dma_cdb));
+ /* NOP with interrupt */
+ set_bit(PPC4XX_DESC_INT, &desc->flags);
+ break;
+ default:
+ printk(KERN_ERR "Unsupported id %d in %s\n", chan->device->id,
+ __func__);
+ break;
+ }
+}
+
+/**
+ * ppc4xx_desc_init_null_xor - initialize the descriptor for NULL XOR
+ * pseudo operation
+ */
+static inline void ppc4xx_desc_init_null_xor(struct ppc4xx_adma_desc_slot *desc)
+{
+ memset(desc->hw_desc, 0, sizeof(struct xor_cb));
+ desc->hw_next = NULL;
+ desc->src_cnt = 0;
+ desc->dst_cnt = 1;
+}
+
+/**
+ * ppc4xx_desc_init_xor - initialize the descriptor for XOR operation
+ */
+static inline void ppc4xx_desc_init_xor(struct ppc4xx_adma_desc_slot *desc,
+ int src_cnt, unsigned long flags)
+{
+ struct xor_cb *hw_desc = desc->hw_desc;
+
+ memset(desc->hw_desc, 0, sizeof(struct xor_cb));
+ desc->hw_next = NULL;
+ desc->src_cnt = src_cnt;
+ desc->dst_cnt = 1;
+
+ hw_desc->cbc = XOR_CBCR_TGT_BIT | src_cnt;
+ if (flags & DMA_PREP_INTERRUPT)
+ /* Enable interrupt on completion */
+ hw_desc->cbc |= XOR_CBCR_CBCE_BIT;
+}
+
+/**
+ * ppc4xx_desc_init_dma2pq - initialize the descriptor for PQ
+ * operation in DMA2 controller
+ */
+static inline void ppc4xx_desc_init_dma2pq(struct ppc4xx_adma_desc_slot *desc,
+ int dst_cnt, int src_cnt,
+ unsigned long flags)
+{
+ struct xor_cb *hw_desc = desc->hw_desc;
+
+ memset(desc->hw_desc, 0, sizeof(struct xor_cb));
+ desc->hw_next = NULL;
+ desc->src_cnt = src_cnt;
+ desc->dst_cnt = dst_cnt;
+ memset(desc->reverse_flags, 0, sizeof(desc->reverse_flags));
+ desc->descs_per_op = 0;
+
+ hw_desc->cbc = XOR_CBCR_TGT_BIT;
+ if (flags & DMA_PREP_INTERRUPT)
+ /* Enable interrupt on completion */
+ hw_desc->cbc |= XOR_CBCR_CBCE_BIT;
+}
+
+#define DMA_CTRL_FLAGS_LAST DMA_PREP_FENCE
+#define DMA_PREP_ZERO_P (DMA_CTRL_FLAGS_LAST << 1)
+#define DMA_PREP_ZERO_Q (DMA_PREP_ZERO_P << 1)
+
+/**
+ * ppc4xx_desc_init_dma01pq - initialize the descriptors for PQ operation
+ * with DMA0/1
+ */
+static inline void ppc4xx_desc_init_dma01pq(struct ppc4xx_adma_desc_slot *desc,
+ int dst_cnt, int src_cnt,
+ unsigned long flags,
+ unsigned long op)
+{
+ struct dma_cdb *hw_desc;
+ struct ppc4xx_adma_desc_slot *iter;
+ u8 dopc;
+
+ /* Common initialization of a PQ descriptors chain */
+ set_bits(op, &desc->flags);
+ desc->src_cnt = src_cnt;
+ desc->dst_cnt = dst_cnt;
+
+ /* WXOR MULTICAST if both P and Q are being computed
+ * MV_SG1_SG2 if Q only
+ */
+ dopc = (desc->dst_cnt == DMA_DEST_MAX_NUM) ?
+ DMA_CDB_OPC_MULTICAST : DMA_CDB_OPC_MV_SG1_SG2;
+
+ list_for_each_entry(iter, &desc->group_list, chain_node) {
+ hw_desc = iter->hw_desc;
+ memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
+
+ if (likely(!list_is_last(&iter->chain_node, &desc->group_list))) {
+ /* set 'next' pointer */
+ iter->hw_next = list_entry(iter->chain_node.next,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ clear_bit(PPC4XX_DESC_INT, &iter->flags);
+ } else {
+ /* this is the last descriptor.
+ * this slot will be pasted from ADMA level
+ * each time it wants to configure parameters
+ * of the transaction (src, dst, ...)
+ */
+ iter->hw_next = NULL;
+ if (flags & DMA_PREP_INTERRUPT)
+ set_bit(PPC4XX_DESC_INT, &iter->flags);
+ else
+ clear_bit(PPC4XX_DESC_INT, &iter->flags);
+ }
+ }
+
+ /* Set OPS depending on WXOR/RXOR type of operation */
+ if (!test_bit(PPC4XX_DESC_RXOR, &desc->flags)) {
+ /* This is a WXOR only chain:
+ * - first descriptors are for zeroing destinations
+ * if PPC4XX_ZERO_P/Q set;
+ * - descriptors remained are for GF-XOR operations.
+ */
+ iter = list_first_entry(&desc->group_list,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+
+ if (test_bit(PPC4XX_ZERO_P, &desc->flags)) {
+ hw_desc = iter->hw_desc;
+ hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
+ iter = list_first_entry(&iter->chain_node,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ }
+
+ if (test_bit(PPC4XX_ZERO_Q, &desc->flags)) {
+ hw_desc = iter->hw_desc;
+ hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
+ iter = list_first_entry(&iter->chain_node,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ }
+
+ list_for_each_entry_from(iter, &desc->group_list, chain_node) {
+ hw_desc = iter->hw_desc;
+ hw_desc->opc = dopc;
+ }
+ } else {
+ /* This is either RXOR-only or mixed RXOR/WXOR */
+
+ /* The first 1 or 2 slots in chain are always RXOR,
+ * if need to calculate P & Q, then there are two
+ * RXOR slots; if only P or only Q, then there is one
+ */
+ iter = list_first_entry(&desc->group_list,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ hw_desc = iter->hw_desc;
+ hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
+
+ if (desc->dst_cnt == DMA_DEST_MAX_NUM) {
+ iter = list_first_entry(&iter->chain_node,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ hw_desc = iter->hw_desc;
+ hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
+ }
+
+ /* The remaining descs (if any) are WXORs */
+ if (test_bit(PPC4XX_DESC_WXOR, &desc->flags)) {
+ iter = list_first_entry(&iter->chain_node,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ list_for_each_entry_from(iter, &desc->group_list,
+ chain_node) {
+ hw_desc = iter->hw_desc;
+ hw_desc->opc = dopc;
+ }
+ }
+ }
+}
+
+/**
+ * ppc4xx_desc_init_dma01pqzero_sum - initialize the descriptor
+ * for PQ_ZERO_SUM operation
+ */
+static inline void ppc4xx_desc_init_dma01pqzero_sum(struct ppc4xx_adma_desc_slot
+ *desc, int dst_cnt,
+ int src_cnt)
+{
+ struct dma_cdb *hw_desc;
+ struct ppc4xx_adma_desc_slot *iter;
+ int i = 0;
+ u8 dopc = (dst_cnt == 2) ? DMA_CDB_OPC_MULTICAST :
+ DMA_CDB_OPC_MV_SG1_SG2;
+ /*
+ * Initialize starting from 2nd or 3rd descriptor dependent
+ * on dst_cnt. First one or two slots are for cloning P
+ * and/or Q to chan->pdest and/or chan->qdest as we have
+ * to preserve original P/Q.
+ */
+ iter = list_first_entry(&desc->group_list,
+ struct ppc4xx_adma_desc_slot, chain_node);
+ iter = list_entry(iter->chain_node.next,
+ struct ppc4xx_adma_desc_slot, chain_node);
+
+ if (dst_cnt > 1) {
+ iter = list_entry(iter->chain_node.next,
+ struct ppc4xx_adma_desc_slot, chain_node);
+ }
+ /* initialize each source descriptor in chain */
+ list_for_each_entry_from(iter, &desc->group_list, chain_node) {
+ hw_desc = iter->hw_desc;
+ memset(iter->hw_desc, 0, sizeof(struct dma_cdb));
+ iter->src_cnt = 0;
+ iter->dst_cnt = 0;
+
+ /* This is a ZERO_SUM operation:
+ * - <src_cnt> descriptors starting from 2nd or 3rd
+ * descriptor are for GF-XOR operations;
+ * - remaining <dst_cnt> descriptors are for checking the result
+ */
+ if (i++ < src_cnt)
+ /* MV_SG1_SG2 if only Q is being verified
+ * MULTICAST if both P and Q are being verified
+ */
+ hw_desc->opc = dopc;
+ else
+ /* DMA_CDB_OPC_DCHECK128 operation */
+ hw_desc->opc = DMA_CDB_OPC_DCHECK128;
+
+ if (likely(!list_is_last(&iter->chain_node, &desc->group_list))) {
+ /* set 'next' pointer */
+ iter->hw_next = list_entry(iter->chain_node.next,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ } else {
+ /* this is the last descriptor.
+ * this slot will be pasted from ADMA level
+ * each time it wants to configure parameters
+ * of the transaction (src, dst, ...)
+ */
+ iter->hw_next = NULL;
+ /* always enable interrupt generation since we get
+ * the status of pqzero from the handler
+ */
+ set_bit(PPC4XX_DESC_INT, &iter->flags);
+ }
+ }
+ desc->src_cnt = src_cnt;
+ desc->dst_cnt = dst_cnt;
+}
+
+/**
+ * ppc4xx_desc_init_memcpy - initialize the descriptor for MEMCPY operation
+ */
+static inline void ppc4xx_desc_init_memcpy(struct ppc4xx_adma_desc_slot *desc,
+ unsigned long flags)
+{
+ struct dma_cdb *hw_desc = desc->hw_desc;
+
+ memset(desc->hw_desc, 0, sizeof(struct dma_cdb));
+ desc->hw_next = NULL;
+ desc->src_cnt = 1;
+ desc->dst_cnt = 1;
+
+ if (flags & DMA_PREP_INTERRUPT)
+ set_bit(PPC4XX_DESC_INT, &desc->flags);
+ else
+ clear_bit(PPC4XX_DESC_INT, &desc->flags);
+
+ hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2;
+}
+
+/**
+ * ppc4xx_desc_init_memset - initialize the descriptor for MEMSET operation
+ */
+static inline void ppc4xx_desc_init_memset(struct ppc4xx_adma_desc_slot *desc,
+ int value, unsigned long flags)
+{
+ struct dma_cdb *hw_desc = desc->hw_desc;
+
+ memset(desc->hw_desc, 0, sizeof(struct dma_cdb));
+ desc->hw_next = NULL;
+ desc->src_cnt = 1;
+ desc->dst_cnt = 1;
+
+ if (flags & DMA_PREP_INTERRUPT)
+ set_bit(PPC4XX_DESC_INT, &desc->flags);
+ else
+ clear_bit(PPC4XX_DESC_INT, &desc->flags);
+
+ hw_desc->sg1u = hw_desc->sg1l = cpu_to_le32((u32) value);
+ hw_desc->sg3u = hw_desc->sg3l = cpu_to_le32((u32) value);
+ hw_desc->opc = DMA_CDB_OPC_DFILL128;
+}
+
+/**
+ * ppc4xx_desc_set_byte_count - set number of data bytes involved
+ * into the operation
+ */
+static inline void ppc4xx_desc_set_byte_count(struct ppc4xx_adma_desc_slot
+ *desc,
+ struct ppc4xx_adma_chan *chan,
+ u32 byte_count)
+{
+ struct dma_cdb *dma_hw_desc;
+ struct xor_cb *xor_hw_desc;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ dma_hw_desc = desc->hw_desc;
+ dma_hw_desc->cnt = cpu_to_le32(byte_count);
+ break;
+ case PPC4XX_XOR_ID:
+ xor_hw_desc = desc->hw_desc;
+ xor_hw_desc->cbbc = byte_count;
+ break;
+ }
+}
+
+/**
+ * ppc4xx_desc_set_dcheck - set CHECK pattern
+ */
+static inline void ppc4xx_desc_set_dcheck(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan,
+ u8 * qword)
+{
+ struct dma_cdb *dma_hw_desc;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ dma_hw_desc = desc->hw_desc;
+ iowrite32(qword[0], &dma_hw_desc->sg3l);
+ iowrite32(qword[4], &dma_hw_desc->sg3u);
+ iowrite32(qword[8], &dma_hw_desc->sg2l);
+ iowrite32(qword[12], &dma_hw_desc->sg2u);
+ break;
+ default:
+ BUG();
+ }
+}
+
+/**
+ * ppc4xx_desc_get_src_addr - extract the source address from the descriptor
+ */
+static inline u32 ppc4xx_desc_get_src_addr(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan,
+ int src_idx)
+{
+ struct dma_cdb *dma_hw_desc;
+ struct xor_cb *xor_hw_desc;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ dma_hw_desc = desc->hw_desc;
+ /* May have 0, 1, 2, or 3 sources */
+ switch (dma_hw_desc->opc) {
+ case DMA_CDB_OPC_NO_OP:
+ case DMA_CDB_OPC_DFILL128:
+ return 0;
+ case DMA_CDB_OPC_DCHECK128:
+ if (unlikely(src_idx)) {
+ printk(KERN_ERR "%s: try to get %d source for"
+ " DCHECK128\n", __func__, src_idx);
+ BUG();
+ }
+ return le32_to_cpu(dma_hw_desc->sg1l);
+ case DMA_CDB_OPC_MULTICAST:
+ case DMA_CDB_OPC_MV_SG1_SG2:
+ if (unlikely(src_idx > 2)) {
+ printk(KERN_ERR "%s: try to get %d source from"
+ " DMA descr\n", __func__, src_idx);
+ BUG();
+ }
+ if (src_idx) {
+ if (le32_to_cpu(dma_hw_desc->sg1u) &
+ DMA_CUED_XOR_WIN_MSK) {
+ u8 region;
+
+ if (src_idx == 1)
+ return le32_to_cpu(dma_hw_desc->
+ sg1l) +
+ desc->unmap_len;
+
+ region =
+ (le32_to_cpu(dma_hw_desc->sg1u)) >>
+ DMA_CUED_REGION_OFF;
+
+ region &= DMA_CUED_REGION_MSK;
+ switch (region) {
+ case DMA_RXOR123:
+ return le32_to_cpu(dma_hw_desc->
+ sg1l) +
+ (desc->unmap_len << 1);
+ case DMA_RXOR124:
+ return le32_to_cpu(dma_hw_desc->
+ sg1l) +
+ (desc->unmap_len * 3);
+ case DMA_RXOR125:
+ return le32_to_cpu(dma_hw_desc->
+ sg1l) +
+ (desc->unmap_len << 2);
+ default:
+ printk(KERN_ERR
+ "%s: try to"
+ " get src3 for region %02x"
+ "PPC4XX_DESC_RXOR12?\n",
+ __func__, region);
+ BUG();
+ }
+ } else {
+ printk(KERN_ERR
+ "%s: try to get %d"
+ " source for non-cued descr\n",
+ __func__, src_idx);
+ BUG();
+ }
+ }
+ return le32_to_cpu(dma_hw_desc->sg1l);
+ default:
+ printk(KERN_ERR "%s: unknown OPC 0x%02x\n",
+ __func__, dma_hw_desc->opc);
+ BUG();
+ }
+ return le32_to_cpu(dma_hw_desc->sg1l);
+ case PPC4XX_XOR_ID:
+ /* May have up to 16 sources */
+ xor_hw_desc = desc->hw_desc;
+ return xor_hw_desc->ops[src_idx].l;
+ }
+ return 0;
+}
+
+/**
+ * ppc4xx_desc_get_dest_addr - extract the destination address from the
+ * descriptor
+ */
+static inline u32 ppc4xx_desc_get_dest_addr(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan,
+ int idx)
+{
+ struct dma_cdb *dma_hw_desc;
+ struct xor_cb *xor_hw_desc;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ dma_hw_desc = desc->hw_desc;
+
+ if (likely(!idx))
+ return le32_to_cpu(dma_hw_desc->sg2l);
+ return le32_to_cpu(dma_hw_desc->sg3l);
+ case PPC4XX_XOR_ID:
+ xor_hw_desc = desc->hw_desc;
+ return xor_hw_desc->cbtal;
+ }
+ return 0;
+}
+
+/**
+ * ppc4xx_desc_get_src_num - extract the number of source addresses from
+ * the descriptor
+ */
+static inline u32 ppc4xx_desc_get_src_num(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan)
+{
+ struct dma_cdb *dma_hw_desc;
+ struct xor_cb *xor_hw_desc;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ dma_hw_desc = desc->hw_desc;
+
+ switch (dma_hw_desc->opc) {
+ case DMA_CDB_OPC_NO_OP:
+ case DMA_CDB_OPC_DFILL128:
+ return 0;
+ case DMA_CDB_OPC_DCHECK128:
+ return 1;
+ case DMA_CDB_OPC_MV_SG1_SG2:
+ case DMA_CDB_OPC_MULTICAST:
+ /*
+ * Only for RXOR operations we have more than
+ * one source
+ */
+ if (le32_to_cpu(dma_hw_desc->sg1u) &
+ DMA_CUED_XOR_WIN_MSK) {
+ /* RXOR op, there are 2 or 3 sources */
+ if (((le32_to_cpu(dma_hw_desc->sg1u) >>
+ DMA_CUED_REGION_OFF) &
+ DMA_CUED_REGION_MSK) == DMA_RXOR12) {
+ /* RXOR 1-2 */
+ return 2;
+ } else {
+ /* RXOR 1-2-3/1-2-4/1-2-5 */
+ return 3;
+ }
+ }
+ return 1;
+ default:
+ printk(KERN_ERR "%s: unknown OPC 0x%02x\n",
+ __func__, dma_hw_desc->opc);
+ BUG();
+ }
+ case PPC4XX_XOR_ID:
+ /* up to 16 sources */
+ xor_hw_desc = desc->hw_desc;
+ return xor_hw_desc->cbc & XOR_CDCR_OAC_MSK;
+ default:
+ BUG();
+ }
+ return 0;
+}
+
+/**
+ * ppc4xx_desc_get_dst_num - get the number of destination addresses in
+ * this descriptor
+ */
+static inline u32 ppc4xx_desc_get_dst_num(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan)
+{
+ struct dma_cdb *dma_hw_desc;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ /* May be 1 or 2 destinations */
+ dma_hw_desc = desc->hw_desc;
+ switch (dma_hw_desc->opc) {
+ case DMA_CDB_OPC_NO_OP:
+ case DMA_CDB_OPC_DCHECK128:
+ return 0;
+ case DMA_CDB_OPC_MV_SG1_SG2:
+ case DMA_CDB_OPC_DFILL128:
+ return 1;
+ case DMA_CDB_OPC_MULTICAST:
+ if (desc->dst_cnt == 2)
+ return 2;
+ else
+ return 1;
+ default:
+ printk(KERN_ERR "%s: unknown OPC 0x%02x\n",
+ __func__, dma_hw_desc->opc);
+ BUG();
+ }
+ case PPC4XX_XOR_ID:
+ /* Always only 1 destination */
+ return 1;
+ default:
+ BUG();
+ }
+ return 0;
+}
+
+/******************************************************************************
+ * ADMA channel low-level routines
+ ******************************************************************************/
+
+static inline u32 ppc4xx_chan_get_current_descriptor(struct ppc4xx_adma_chan
+ *chan);
+static inline void ppc4xx_dma_put_desc(struct ppc4xx_adma_chan *chan,
+ struct ppc4xx_adma_desc_slot *desc);
+static inline void ppc4xx_xor_set_link(struct ppc4xx_adma_desc_slot *prev_desc,
+ struct ppc4xx_adma_desc_slot *next_desc);
+static inline void print_cb_list(struct ppc4xx_adma_chan *chan,
+ struct ppc4xx_adma_desc_slot *iter);
+/**
+ * ppc4xx_chan_append - update the h/w chain in the channel
+ */
+static inline void ppc4xx_chan_append(struct ppc4xx_adma_chan *chan)
+{
+ struct xor_regs *xor_reg;
+ struct ppc4xx_adma_desc_slot *iter;
+ struct xor_cb *xcb;
+ u32 cur_desc;
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ cur_desc = ppc4xx_chan_get_current_descriptor(chan);
+
+ if (likely(cur_desc)) {
+ iter = chan_last_sub[chan->device->id];
+ BUG_ON(!iter);
+ } else {
+ /* first peer */
+ iter = chan_first_cdb[chan->device->id];
+ BUG_ON(!iter);
+ ppc4xx_dma_put_desc(chan, iter);
+ chan->hw_chain_inited = 1;
+ }
+
+ /* is there something new to append */
+ if (!iter->hw_next)
+ break;
+
+ /* flush descriptors from the s/w queue to fifo */
+ list_for_each_entry_continue(iter, &chan->chain, chain_node) {
+ ppc4xx_dma_put_desc(chan, iter);
+ if (!iter->hw_next)
+ break;
+ }
+ break;
+ case PPC4XX_XOR_ID:
+ /* update h/w links and refetch */
+ if (!xor_last_submit->hw_next)
+ break;
+
+ xor_reg = chan->device->xor_reg;
+ /* the last linked CDB has to generate an interrupt
+ * that we'd be able to append the next lists to h/w
+ * regardless of the XOR engine state at the moment of
+ * appending of these next lists
+ */
+ xcb = xor_last_linked->hw_desc;
+ xcb->cbc |= XOR_CBCR_CBCE_BIT;
+
+ if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT)) {
+ /* XORcore is idle. Refetch now */
+ do_xor_refetch = 0;
+ ppc4xx_xor_set_link(xor_last_submit,
+ xor_last_submit->hw_next);
+
+ ADMA_LL_DBG(print_cb_list(chan,
+ xor_last_submit->hw_next));
+
+ xor_last_submit = xor_last_linked;
+ iowrite32be(ioread32be(&xor_reg->crsr) |
+ XOR_CRSR_RCBE_BIT | XOR_CRSR_64BA_BIT,
+ &xor_reg->crsr);
+ } else {
+ /* XORcore is running. Refetch later in the handler */
+ do_xor_refetch = 1;
+ }
+
+ break;
+ }
+
+ local_irq_restore(flags);
+}
+
+/**
+ * ppc4xx_adma_device_clear_eot_status - interrupt ack to XOR or DMA engine
+ */
+static inline void ppc4xx_adma_device_clear_eot_status(struct ppc4xx_adma_chan
+ *chan)
+{
+ struct dma_regs *dma_reg;
+ struct xor_regs *xor_reg;
+ u8 *p = chan->device->dma_desc_pool_virt;
+ struct dma_cdb *cdb;
+ u32 rv, i;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ /* read FIFO to ack */
+ dma_reg = chan->device->dma_reg;
+ while ((rv = ioread32(&dma_reg->csfpl))) {
+ i = rv & DMA_CDB_ADDR_MSK;
+ cdb = (struct dma_cdb *)&p[i -
+ (u32) chan->device->
+ dma_desc_pool];
+
+ /* Clear opcode to ack. This is necessary for
+ * ZeroSum operations only
+ */
+ cdb->opc = 0;
+
+ if (test_bit(PPC4XX_RXOR_RUN, &ppc4xx_rxor_state)) {
+ /* probably this is a completed RXOR op,
+ * get pointer to CDB using the fact that
+ * physical and virtual addresses of CDB
+ * in pools have the same offsets
+ */
+ if (le32_to_cpu(cdb->sg1u) & DMA_CUED_XOR_BASE) {
+ /* this is a RXOR */
+ clear_bit(PPC4XX_RXOR_RUN,
+ &ppc4xx_rxor_state);
+ }
+ }
+
+ if (rv & DMA_CDB_STATUS_MSK) {
+ /* ZeroSum check failed
+ */
+ struct ppc4xx_adma_desc_slot *iter;
+ dma_addr_t phys = rv & ~DMA_CDB_MSK;
+
+ /*
+ * Update the status of corresponding
+ * descriptor.
+ */
+ list_for_each_entry(iter, &chan->chain,
+ chain_node) {
+ if (iter->phys == phys)
+ break;
+ }
+ /*
+ * if cannot find the corresponding
+ * slot it's a bug
+ */
+ BUG_ON(&iter->chain_node == &chan->chain);
+
+ if (iter->xor_check_result) {
+ if (test_bit(PPC4XX_DESC_PCHECK,
+ &iter->flags)) {
+ *iter->xor_check_result |=
+ SUM_CHECK_P_RESULT;
+ } else
+ if (test_bit(PPC4XX_DESC_QCHECK,
+ &iter->flags)) {
+ *iter->xor_check_result |=
+ SUM_CHECK_Q_RESULT;
+ } else
+ BUG();
+ }
+ }
+ }
+
+ rv = ioread32(&dma_reg->dsts);
+ if (rv) {
+ pr_err("DMA%d err status: 0x%x\n",
+ chan->device->id, rv);
+ /* write back to clear */
+ iowrite32(rv, &dma_reg->dsts);
+ }
+ break;
+ case PPC4XX_XOR_ID:
+ /* reset status bits to ack */
+ xor_reg = chan->device->xor_reg;
+ rv = ioread32be(&xor_reg->sr);
+ iowrite32be(rv, &xor_reg->sr);
+
+ if (rv &
+ (XOR_IE_ICBIE_BIT | XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT)) {
+ if (rv & XOR_IE_RPTIE_BIT) {
+ /* Read PLB Timeout Error.
+ * Try to resubmit the CB
+ */
+ u32 val = ioread32be(&xor_reg->ccbalr);
+
+ iowrite32be(val, &xor_reg->cblalr);
+
+ val = ioread32be(&xor_reg->crsr);
+ iowrite32be(val | XOR_CRSR_XAE_BIT,
+ &xor_reg->crsr);
+ } else
+ pr_err("XOR ERR 0x%x status\n", rv);
+ break;
+ }
+
+ /* if the XORcore is idle, but there are unprocessed CBs
+ * then refetch the s/w chain here
+ */
+ if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) &&
+ do_xor_refetch)
+ ppc4xx_chan_append(chan);
+ break;
+ }
+}
+
+/**
+ * ppc4xx_chan_is_busy - get the channel status
+ */
+static inline int ppc4xx_chan_is_busy(struct ppc4xx_adma_chan *chan)
+{
+ struct dma_regs *dma_reg;
+ struct xor_regs *xor_reg;
+ int busy = 0;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ dma_reg = chan->device->dma_reg;
+ /* if command FIFO's head and tail pointers are equal and
+ * status tail is the same as command, then channel is free
+ */
+ if (ioread16(&dma_reg->cpfhp) != ioread16(&dma_reg->cpftp) ||
+ ioread16(&dma_reg->cpftp) != ioread16(&dma_reg->csftp))
+ busy = 1;
+ break;
+ case PPC4XX_XOR_ID:
+ /* use the special status bit for the XORcore
+ */
+ xor_reg = chan->device->xor_reg;
+ busy = (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) ? 1 : 0;
+ break;
+ }
+
+ return busy;
+}
+
+/**
+ * ppc4xx_chan_set_first_xor_descriptor - init XORcore chain
+ */
+static inline void ppc4xx_chan_set_first_xor_descriptor(struct ppc4xx_adma_chan
+ *chan,
+ struct
+ ppc4xx_adma_desc_slot
+ *next_desc)
+{
+ struct xor_regs *xor_reg = chan->device->xor_reg;
+
+ if (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT)
+ printk(KERN_INFO "%s: Warn: XORcore is running "
+ "when try to set the first CDB!\n", __func__);
+
+ xor_last_submit = xor_last_linked = next_desc;
+
+ iowrite32be(XOR_CRSR_64BA_BIT, &xor_reg->crsr);
+
+ iowrite32be(next_desc->phys, &xor_reg->cblalr);
+ iowrite32be(0, &xor_reg->cblahr);
+ iowrite32be(ioread32be(&xor_reg->cbcr) | XOR_CBCR_LNK_BIT,
+ &xor_reg->cbcr);
+
+ chan->hw_chain_inited = 1;
+}
+
+/**
+ * ppc4xx_chan_run - enable the channel
+ */
+static inline void ppc4xx_chan_run(struct ppc4xx_adma_chan *chan)
+{
+ struct xor_regs *xor_reg;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ /* DMAs are always enabled, do nothing */
+ break;
+ case PPC4XX_XOR_ID:
+ /* drain write buffer */
+ xor_reg = chan->device->xor_reg;
+
+ /* fetch descriptor pointed to in <link> */
+ iowrite32be(XOR_CRSR_64BA_BIT | XOR_CRSR_XAE_BIT,
+ &xor_reg->crsr);
+ break;
+ }
+}
+
+/**
+ * ppc4xx_adma_device_estimate - estimate the efficiency of processing
+ * the operation given on this channel. It's assumed that 'chan' is
+ * capable to process 'cap' type of operation.
+ * @chan: channel to use
+ * @cap: type of transaction
+ * @dst_lst: array of destination pointers
+ * @dst_cnt: number of destination operands
+ * @src_lst: array of source pointers
+ * @src_cnt: number of source operands
+ * @src_sz: size of each source operand
+ */
+
+#define DMA_CTRL_FLAGS_LAST DMA_PREP_FENCE
+#define DMA_PREP_ZERO_P (DMA_CTRL_FLAGS_LAST << 1)
+#define DMA_PREP_ZERO_Q (DMA_PREP_ZERO_P << 1)
+
+static inline void print_cb_list(struct ppc4xx_adma_chan *chan,
+ struct ppc4xx_adma_desc_slot *iter)
+{
+ for (; iter; iter = iter->hw_next)
+ print_cb(chan, iter->hw_desc);
+}
+
+/**
+ * ppc4xx_dma_put_desc - put DMA0,1 descriptor to FIFO.
+ * called with irqs disabled
+ */
+static inline void ppc4xx_dma_put_desc(struct ppc4xx_adma_chan *chan,
+ struct ppc4xx_adma_desc_slot *desc)
+{
+ u32 pcdb;
+ struct dma_regs *dma_reg = chan->device->dma_reg;
+
+ pcdb = desc->phys;
+ if (!test_bit(PPC4XX_DESC_INT, &desc->flags))
+ pcdb |= DMA_CDB_NO_INT;
+
+ chan_last_sub[chan->device->id] = desc;
+
+ ADMA_LL_DBG(print_cb(chan, desc->hw_desc));
+
+ iowrite32(pcdb, &dma_reg->cpfpl);
+}
+
+/**
+ * ppc4xx_xor_set_link - set link address in xor CB
+ */
+static inline void ppc4xx_xor_set_link(struct ppc4xx_adma_desc_slot *prev_desc,
+ struct ppc4xx_adma_desc_slot *next_desc)
+{
+ struct xor_cb *xor_hw_desc = prev_desc->hw_desc;
+
+ if (unlikely(!next_desc || !(next_desc->phys))) {
+ printk(KERN_ERR "%s: next_desc=0x%p; next_desc->phys=0x%llx\n",
+ __func__, next_desc, next_desc ? next_desc->phys : 0);
+ BUG();
+ }
+
+ xor_hw_desc->cbs = 0;
+ xor_hw_desc->cblal = next_desc->phys;
+ xor_hw_desc->cblah = 0;
+ xor_hw_desc->cbc |= XOR_CBCR_LNK_BIT;
+}
+
+/**
+ * ppc4xx_desc_set_link - set the address of descriptor following this
+ * descriptor in chain
+ */
+static inline void ppc4xx_desc_set_link(struct ppc4xx_adma_chan *chan,
+ struct ppc4xx_adma_desc_slot *prev_desc,
+ struct ppc4xx_adma_desc_slot *next_desc)
+{
+ unsigned long flags;
+ struct ppc4xx_adma_desc_slot *tail = next_desc;
+
+ if (unlikely(!prev_desc || !next_desc ||
+ (prev_desc->hw_next && prev_desc->hw_next != next_desc))) {
+ /* If previous next is overwritten something is wrong.
+ * though we may refetch from append to initiate list
+ * processing; in this case - it's ok.
+ */
+ printk(KERN_ERR "%s: prev_desc=0x%p; next_desc=0x%p; "
+ "prev->hw_next=0x%p\n", __func__, prev_desc,
+ next_desc, prev_desc ? prev_desc->hw_next : 0);
+ BUG();
+ }
+
+ local_irq_save(flags);
+
+ /* do s/w chaining both for DMA and XOR descriptors */
+ prev_desc->hw_next = next_desc;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ break;
+ case PPC4XX_XOR_ID:
+ /* bind descriptor to the chain */
+ while (tail->hw_next)
+ tail = tail->hw_next;
+ xor_last_linked = tail;
+
+ if (prev_desc == xor_last_submit)
+ /* do not link to the last submitted CB */
+ break;
+ ppc4xx_xor_set_link(prev_desc, next_desc);
+ break;
+ }
+
+ local_irq_restore(flags);
+}
+
+/******************************************************************************
+ * CDB field manipulation routines
+ ******************************************************************************/
+/**
+ * ppc4xx_desc_set_dest_addr - set destination address into the descriptor
+ */
+static inline void ppc4xx_desc_set_dest_addr(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan,
+ dma_addr_t addrh, dma_addr_t addrl,
+ u32 dst_idx)
+{
+ struct dma_cdb *dma_hw_desc;
+ struct xor_cb *xor_hw_desc;
+ phys_addr_t addr64, tmphi, tmplow;
+ u32 *psgu, *psgl;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ if (!addrh) {
+ addr64 = addrl;
+ tmphi = (addr64 >> 32);
+ tmplow = (addr64 & 0xFFFFFFFF);
+ } else {
+ tmphi = addrh;
+ tmplow = addrl;
+ }
+ dma_hw_desc = desc->hw_desc;
+
+ psgu = dst_idx ? &dma_hw_desc->sg3u : &dma_hw_desc->sg2u;
+ psgl = dst_idx ? &dma_hw_desc->sg3l : &dma_hw_desc->sg2l;
+
+ *psgl = cpu_to_le32((u32) tmplow);
+ *psgu |= cpu_to_le32((u32) tmphi);
+ break;
+ case PPC4XX_XOR_ID:
+ xor_hw_desc = desc->hw_desc;
+ xor_hw_desc->cbtal = addrl;
+ xor_hw_desc->cbtah |= addrh;
+ break;
+ }
+}
+
+/**
+ * ppc4xx_desc_set_src_addr - set source address into the descriptor
+ */
+static inline void ppc4xx_desc_set_src_addr(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan,
+ int src_idx, dma_addr_t addrh,
+ dma_addr_t addrl)
+{
+ struct dma_cdb *dma_hw_desc;
+ struct xor_cb *xor_hw_desc;
+ phys_addr_t addr64, tmplow, tmphi;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ if (!addrh) {
+ addr64 = addrl;
+ tmphi = (addr64 >> 32);
+ tmplow = (addr64 & 0xFFFFFFFF);
+ } else {
+ tmphi = addrh;
+ tmplow = addrl;
+ }
+ dma_hw_desc = desc->hw_desc;
+ dma_hw_desc->sg1l = cpu_to_le32((u32) tmplow);
+ dma_hw_desc->sg1u |= cpu_to_le32((u32) tmphi);
+ break;
+ case PPC4XX_XOR_ID:
+ xor_hw_desc = desc->hw_desc;
+ xor_hw_desc->ops[src_idx].l = addrl;
+ xor_hw_desc->ops[src_idx].h |= addrh;
+ break;
+ }
+}
+
+/**
+ * ppc4xx_desc_set_src_mult - set source address mult into the descriptor
+ */
+static inline void ppc4xx_desc_set_src_mult(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan,
+ u32 mult_index, int sg_index,
+ unsigned char mult_value)
+{
+ struct dma_cdb *dma_hw_desc;
+ struct xor_cb *xor_hw_desc;
+ u32 *psgu;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ dma_hw_desc = desc->hw_desc;
+
+ switch (sg_index) {
+ /* for RXOR operations set multiplier
+ * into source cued address
+ */
+ case DMA_CDB_SG_SRC:
+ psgu = &dma_hw_desc->sg1u;
+ break;
+ /* for WXOR operations set multiplier
+ * into destination cued address(es)
+ */
+ case DMA_CDB_SG_DST1:
+ psgu = &dma_hw_desc->sg2u;
+ break;
+ case DMA_CDB_SG_DST2:
+ psgu = &dma_hw_desc->sg3u;
+ break;
+ default:
+ BUG();
+ }
+
+ *psgu |= cpu_to_le32(mult_value << mult_index);
+ break;
+ case PPC4XX_XOR_ID:
+ xor_hw_desc = desc->hw_desc;
+ break;
+ default:
+ BUG();
+ }
+}
+
+/******************************************************************************
+ * ADMA channel low-level routines
+ ******************************************************************************/
+
+static void ppc4xx_adma_device_clear_eot_status(struct ppc4xx_adma_chan *chan);
+static inline int ppc4xx_adma_dma2rxor_prep_src(struct ppc4xx_adma_desc_slot
+ *hdesc,
+ struct ppc4xx_rxor *cursor,
+ int index, int src_cnt,
+ u32 addr);
+
+static int ppc4xx_chan_is_busy(struct ppc4xx_adma_chan *chan);
+static void ppc4xx_chan_set_first_xor_descriptor(struct ppc4xx_adma_chan *chan, struct ppc4xx_adma_desc_slot
+ *next_desc);
+/**
+ * ppc4xx_chan_get_current_descriptor - get the currently executed descriptor
+ */
+static inline u32 ppc4xx_chan_get_current_descriptor(struct ppc4xx_adma_chan
+ *chan)
+{
+ struct dma_regs *dma_reg;
+ struct xor_regs *xor_reg;
+
+ if (unlikely(!chan->hw_chain_inited))
+ /* h/w descriptor chain is not initialized yet */
+ return 0;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ dma_reg = chan->device->dma_reg;
+ return ioread32(&dma_reg->acpl) & (~DMA_CDB_MSK);
+ case PPC4XX_XOR_ID:
+ xor_reg = chan->device->xor_reg;
+ return ioread32be(&xor_reg->ccbalr);
+ }
+ return 0;
+}
+
+static void ppc4xx_chan_run(struct ppc4xx_adma_chan *chan);
+/**
+ * ppc4xx_adma_clean_slot - clean up CDB slot (if ack is set)
+ */
+static inline int ppc4xx_adma_clean_slot(struct ppc4xx_adma_desc_slot *desc,
+ struct ppc4xx_adma_chan *chan)
+{
+ /* the client is allowed to attach dependent operations
+ * until 'ack' is set
+ */
+ if (!async_tx_test_ack(&desc->async_tx))
+ return 0;
+
+ /* leave the last descriptor in the chain
+ * so we can append to it
+ */
+ if (list_is_last(&desc->chain_node, &chan->chain) ||
+ desc->phys == ppc4xx_chan_get_current_descriptor(chan))
+ return 1;
+
+ if (chan->device->id != PPC4XX_XOR_ID) {
+ /* our DMA interrupt handler clears opc field of
+ * each processed descriptor. For all types of
+ * operations except for ZeroSum we do not actually
+ * need ack from the interrupt handler. ZeroSum is a
+ * special case since the result of this operation
+ * is available from the handler only, so if we see
+ * such type of descriptor (which is unprocessed yet)
+ * then leave it in chain.
+ */
+ struct dma_cdb *cdb = desc->hw_desc;
+ if (cdb->opc == DMA_CDB_OPC_DCHECK128)
+ return 1;
+ }
+
+ dev_dbg(chan->device->common.dev, "\tfree slot %llx: %d stride: %d\n",
+ desc->phys, desc->idx, desc->slots_per_op);
+
+ list_del(&desc->chain_node);
+ ppc4xx_adma_free_slots(desc, chan);
+ return 0;
+}
+
+/**
+ * ppc4xx_rxor_set_region_data -
+ */
+static inline void ppc4xx_rxor_set_region(struct ppc4xx_adma_desc_slot *desc,
+ u8 xor_arg_no, u32 mask)
+{
+ struct xor_cb *xcb = desc->hw_desc;
+
+ xcb->ops[xor_arg_no].h |= mask;
+}
+
+/**
+ * ppc4xx_rxor_set_src -
+ */
+static inline void ppc4xx_rxor_set_src(struct ppc4xx_adma_desc_slot *desc,
+ u8 xor_arg_no, dma_addr_t addr)
+{
+ struct xor_cb *xcb = desc->hw_desc;
+
+ xcb->ops[xor_arg_no].h |= DMA_CUED_XOR_BASE;
+ xcb->ops[xor_arg_no].l = addr;
+}
+
+/**
+ * ppc4xx_rxor_set_mult -
+ */
+static inline void ppc4xx_rxor_set_mult(struct ppc4xx_adma_desc_slot *desc,
+ u8 xor_arg_no, u8 idx, u8 mult)
+{
+ struct xor_cb *xcb = desc->hw_desc;
+
+ xcb->ops[xor_arg_no].h |= mult << (DMA_CUED_MULT1_OFF + idx * 8);
+}
+
+/**
+ * ppc4xx_adma_dma2rxor_set_src - set RXOR source address; it's assumed that
+ * ppc4xx_adma_dma2rxor_prep_src() has already done prior this call
+ */
+static inline void ppc4xx_adma_dma2rxor_set_src(struct ppc4xx_adma_desc_slot
+ *desc, int index,
+ dma_addr_t addr)
+{
+ struct xor_cb *xcb = desc->hw_desc;
+ int k = 0, op = 0, lop = 0;
+
+ /* get the RXOR operand which corresponds to index addr */
+ while (op <= index) {
+ lop = op;
+ if (k == XOR_MAX_OPS) {
+ k = 0;
+ desc = list_entry(desc->chain_node.next,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ xcb = desc->hw_desc;
+
+ }
+ if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) ==
+ (DMA_RXOR12 << DMA_CUED_REGION_OFF))
+ op += 2;
+ else
+ op += 3;
+ }
+
+ BUG_ON(k < 1);
+
+ if (test_bit(k - 1, desc->reverse_flags)) {
+ /* reverse operand order; put last op in RXOR group */
+ if (index == op - 1)
+ ppc4xx_rxor_set_src(desc, k - 1, addr);
+ } else {
+ /* direct operand order; put first op in RXOR group */
+ if (index == lop)
+ ppc4xx_rxor_set_src(desc, k - 1, addr);
+ }
+}
+
+/**
+ * ppc4xx_adma_pq_set_src - set source address into descriptor
+ */
+static inline void ppc4xx_adma_pq_set_src(struct ppc4xx_adma_desc_slot *sw_desc,
+ dma_addr_t addr, int index)
+{
+ struct ppc4xx_adma_chan *chan;
+ dma_addr_t haddr = 0;
+ struct ppc4xx_adma_desc_slot *iter = NULL;
+
+ chan = to_ppc4xx_adma_chan(sw_desc->async_tx.chan);
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ /* DMA0,1 may do: WXOR, RXOR, RXOR+WXORs chain
+ */
+ if (test_bit(PPC4XX_DESC_RXOR, &sw_desc->flags)) {
+ /* RXOR-only or RXOR/WXOR operation */
+ int iskip = test_bit(PPC4XX_DESC_RXOR12,
+ &sw_desc->flags) ? 2 : 3;
+
+ if (index == 0) {
+ /* 1st slot (RXOR) */
+ /* setup sources region (R1-2-3, R1-2-4,
+ * or R1-2-5)
+ */
+ if (test_bit(PPC4XX_DESC_RXOR12,
+ &sw_desc->flags))
+ haddr = DMA_RXOR12 <<
+ DMA_CUED_REGION_OFF;
+ else if (test_bit(PPC4XX_DESC_RXOR123,
+ &sw_desc->flags))
+ haddr = DMA_RXOR123 <<
+ DMA_CUED_REGION_OFF;
+ else if (test_bit(PPC4XX_DESC_RXOR124,
+ &sw_desc->flags))
+ haddr = DMA_RXOR124 <<
+ DMA_CUED_REGION_OFF;
+ else if (test_bit(PPC4XX_DESC_RXOR125,
+ &sw_desc->flags))
+ haddr = DMA_RXOR125 <<
+ DMA_CUED_REGION_OFF;
+ else
+ BUG();
+ haddr |= DMA_CUED_XOR_BASE;
+ iter = ppc4xx_get_group_entry(sw_desc, 0);
+ } else if (index < iskip) {
+ /* 1st slot (RXOR)
+ * shall actually set source address only once
+ * instead of first <iskip>
+ */
+ iter = NULL;
+ } else {
+ /* 2nd/3d and next slots (WXOR);
+ * skip first slot with RXOR
+ */
+ haddr = DMA_CUED_XOR_HB;
+ iter = ppc4xx_get_group_entry(sw_desc,
+ index - iskip +
+ sw_desc->dst_cnt);
+ }
+ } else {
+ int znum = 0;
+
+ /* WXOR-only operation; skip first slots with
+ * zeroing destinations
+ */
+ if (test_bit(PPC4XX_ZERO_P, &sw_desc->flags))
+ znum++;
+ if (test_bit(PPC4XX_ZERO_Q, &sw_desc->flags))
+ znum++;
+
+ haddr = DMA_CUED_XOR_HB;
+ iter = ppc4xx_get_group_entry(sw_desc, index + znum);
+ }
+
+ if (likely(iter)) {
+ ppc4xx_desc_set_src_addr(iter, chan, 0, haddr, addr);
+
+ if (!index &&
+ test_bit(PPC4XX_DESC_RXOR, &sw_desc->flags) &&
+ sw_desc->dst_cnt == 2) {
+ /* if we have two destinations for RXOR, then
+ * setup source in the second descr too
+ */
+ iter = ppc4xx_get_group_entry(sw_desc, 1);
+ ppc4xx_desc_set_src_addr(iter, chan, 0,
+ haddr, addr);
+ }
+ }
+ break;
+
+ case PPC4XX_XOR_ID:
+ /* DMA2 may do Biskup */
+ iter = sw_desc->group_head;
+ if (iter->dst_cnt == 2) {
+ /* both P & Q calculations required; set P src here */
+ ppc4xx_adma_dma2rxor_set_src(iter, index, addr);
+
+ /* this is for Q */
+ iter = ppc4xx_get_group_entry(sw_desc,
+ sw_desc->descs_per_op);
+ }
+ ppc4xx_adma_dma2rxor_set_src(iter, index, addr);
+ break;
+ }
+}
+
+/**
+ * ppc4xx_adma_dma2rxor_set_mult - set RXOR multipliers; it's assumed that
+ * ppc4xx_adma_dma2rxor_prep_src() has already done prior this call
+ */
+static inline void ppc4xx_adma_dma2rxor_set_mult(struct ppc4xx_adma_desc_slot
+ *desc, int index, u8 mult)
+{
+ struct xor_cb *xcb = desc->hw_desc;
+ int k = 0, op = 0, lop = 0;
+
+ /* get the RXOR operand which corresponds to index mult */
+ while (op <= index) {
+ lop = op;
+ if (k == XOR_MAX_OPS) {
+ k = 0;
+ desc = list_entry(desc->chain_node.next,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ xcb = desc->hw_desc;
+
+ }
+ if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) ==
+ (DMA_RXOR12 << DMA_CUED_REGION_OFF))
+ op += 2;
+ else
+ op += 3;
+ }
+
+ BUG_ON(k < 1);
+ if (test_bit(k - 1, desc->reverse_flags)) {
+ /* reverse order */
+ ppc4xx_rxor_set_mult(desc, k - 1, op - index - 1, mult);
+ } else {
+ /* direct order */
+ ppc4xx_rxor_set_mult(desc, k - 1, index - lop, mult);
+ }
+}
+
+/**
+ * ppc4xx_adma_pq_set_src_mult - set multiplication coefficient into
+ * descriptor for the PQXOR operation
+ */
+static inline void ppc4xx_adma_pq_set_src_mult(struct ppc4xx_adma_desc_slot
+ *sw_desc, unsigned char mult,
+ int index, int dst_pos)
+{
+ struct ppc4xx_adma_chan *chan;
+ u32 mult_idx, mult_dst;
+ struct ppc4xx_adma_desc_slot *iter = NULL, *iter1 = NULL;
+
+ chan = to_ppc4xx_adma_chan(sw_desc->async_tx.chan);
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ if (test_bit(PPC4XX_DESC_RXOR, &sw_desc->flags)) {
+ int region = test_bit(PPC4XX_DESC_RXOR12,
+ &sw_desc->flags) ? 2 : 3;
+
+ if (index < region) {
+ /* RXOR multipliers */
+ iter = ppc4xx_get_group_entry(sw_desc,
+ sw_desc->
+ dst_cnt - 1);
+ if (sw_desc->dst_cnt == 2)
+ iter1 =
+ ppc4xx_get_group_entry(sw_desc, 0);
+
+ mult_idx = DMA_CUED_MULT1_OFF + (index << 3);
+ mult_dst = DMA_CDB_SG_SRC;
+ } else {
+ /* WXOR multiplier */
+ iter = ppc4xx_get_group_entry(sw_desc,
+ index -
+ region +
+ sw_desc->dst_cnt);
+ mult_idx = DMA_CUED_MULT1_OFF;
+ mult_dst = dst_pos ? DMA_CDB_SG_DST2 :
+ DMA_CDB_SG_DST1;
+ }
+ } else {
+ int znum = 0;
+
+ /* WXOR-only;
+ * skip first slots with destinations (if ZERO_DST has
+ * place)
+ */
+ if (test_bit(PPC4XX_ZERO_P, &sw_desc->flags))
+ znum++;
+ if (test_bit(PPC4XX_ZERO_Q, &sw_desc->flags))
+ znum++;
+
+ iter = ppc4xx_get_group_entry(sw_desc, index + znum);
+ mult_idx = DMA_CUED_MULT1_OFF;
+ mult_dst = dst_pos ? DMA_CDB_SG_DST2 : DMA_CDB_SG_DST1;
+ }
+
+ if (likely(iter)) {
+ ppc4xx_desc_set_src_mult(iter, chan,
+ mult_idx, mult_dst, mult);
+
+ if (unlikely(iter1)) {
+ /* if we have two destinations for RXOR, then
+ * we've just set Q mult. Set-up P now.
+ */
+ ppc4xx_desc_set_src_mult(iter1, chan,
+ mult_idx, mult_dst, 1);
+ }
+
+ }
+ break;
+
+ case PPC4XX_XOR_ID:
+ iter = sw_desc->group_head;
+ if (sw_desc->dst_cnt == 2) {
+ /* both P & Q calculations required; set P mult here */
+ ppc4xx_adma_dma2rxor_set_mult(iter, index, 1);
+
+ /* and then set Q mult */
+ iter = ppc4xx_get_group_entry(sw_desc,
+ sw_desc->descs_per_op);
+ }
+ ppc4xx_adma_dma2rxor_set_mult(iter, index, mult);
+ break;
+ }
+}
+
+/**
+ * ppc4xx_adma_pq_zero_sum_set_dest - set destination address into descriptor
+ * for the PQ_ZERO_SUM operation
+ */
+static inline void ppc4xx_adma_pqzero_sum_set_dest(struct ppc4xx_adma_desc_slot
+ *sw_desc, dma_addr_t paddr,
+ dma_addr_t qaddr)
+{
+ struct ppc4xx_adma_desc_slot *iter, *end;
+ struct ppc4xx_adma_chan *chan;
+ dma_addr_t addr = 0;
+ int idx;
+
+ chan = to_ppc4xx_adma_chan(sw_desc->async_tx.chan);
+
+ /* walk through the WXOR source list and set P/Q-destinations
+ * for each slot
+ */
+ idx = (paddr && qaddr) ? 2 : 1;
+ /* set end */
+ list_for_each_entry_reverse(end, &sw_desc->group_list, chain_node) {
+ if (!(--idx))
+ break;
+ }
+ /* set start */
+ idx = (paddr && qaddr) ? 2 : 1;
+ iter = ppc4xx_get_group_entry(sw_desc, idx);
+
+ if (paddr && qaddr) {
+ /* two destinations */
+ list_for_each_entry_from(iter, &sw_desc->group_list, chain_node) {
+ if (unlikely(iter == end))
+ break;
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ DMA_CUED_XOR_BASE, paddr, 0);
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ DMA_CUED_XOR_BASE, qaddr, 1);
+ }
+ } else {
+ /* one destination */
+ addr = paddr ? paddr : qaddr;
+ list_for_each_entry_from(iter, &sw_desc->group_list, chain_node) {
+ if (unlikely(iter == end))
+ break;
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ DMA_CUED_XOR_BASE, addr, 0);
+ }
+ }
+
+ /* The remaining descriptors are DATACHECK. These have no need in
+ * destination. Actually, these destinations are used there
+ * as sources for check operation. So, set addr as source.
+ */
+ ppc4xx_desc_set_src_addr(end, chan, 0, 0, addr ? addr : paddr);
+
+ if (!addr) {
+ end = list_entry(end->chain_node.next,
+ struct ppc4xx_adma_desc_slot, chain_node);
+ ppc4xx_desc_set_src_addr(end, chan, 0, 0, qaddr);
+ }
+}
+
+static inline void ppc4xx_adma_pq_zero_op(struct ppc4xx_adma_desc_slot *iter,
+ struct ppc4xx_adma_chan *chan,
+ dma_addr_t addr)
+{
+ /* To clear destinations update the descriptor
+ * (P or Q depending on index) as follows:
+ * addr is destination (0 corresponds to SG2):
+ */
+ ppc4xx_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, addr, 0);
+
+ /* ... and the addr is source: */
+ ppc4xx_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, addr);
+
+ /* addr is always SG2 then the mult is always DST1 */
+ ppc4xx_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF,
+ DMA_CDB_SG_DST1, 1);
+}
+
+/**
+ * ppc4xx_adma_pq_set_dest - set destination address into descriptor
+ * for the PQXOR operation
+ */
+static inline void ppc4xx_adma_pq_set_dest(struct ppc4xx_adma_desc_slot
+ *sw_desc, dma_addr_t * addrs,
+ unsigned long flags)
+{
+ struct ppc4xx_adma_desc_slot *iter;
+ struct ppc4xx_adma_chan *chan;
+ dma_addr_t paddr, qaddr;
+ dma_addr_t addr = 0, ppath, qpath;
+ int index = 0, i;
+
+ chan = to_ppc4xx_adma_chan(sw_desc->async_tx.chan);
+
+ if (flags & DMA_PREP_PQ_DISABLE_P)
+ paddr = 0;
+ else
+ paddr = addrs[0];
+
+ if (flags & DMA_PREP_PQ_DISABLE_Q)
+ qaddr = 0;
+ else
+ qaddr = addrs[1];
+
+ if (!paddr || !qaddr)
+ addr = paddr ? paddr : qaddr;
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ /* walk through the WXOR source list and set P/Q-destinations
+ * for each slot:
+ */
+ if (!test_bit(PPC4XX_DESC_RXOR, &sw_desc->flags)) {
+ /* This is WXOR-only chain; may have 1/2 zero descs */
+ if (test_bit(PPC4XX_ZERO_P, &sw_desc->flags))
+ index++;
+ if (test_bit(PPC4XX_ZERO_Q, &sw_desc->flags))
+ index++;
+
+ iter = ppc4xx_get_group_entry(sw_desc, index);
+ if (addr) {
+ /* one destination */
+ list_for_each_entry_from(iter,
+ &sw_desc->group_list,
+ chain_node)
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ DMA_CUED_XOR_BASE,
+ addr, 0);
+ } else {
+ /* two destinations */
+ list_for_each_entry_from(iter,
+ &sw_desc->group_list,
+ chain_node) {
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ DMA_CUED_XOR_BASE,
+ paddr, 0);
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ DMA_CUED_XOR_BASE,
+ qaddr, 1);
+ }
+ }
+
+ if (index) {
+ /* To clear destinations update the descriptor
+ * (1st,2nd, or both depending on flags)
+ */
+ index = 0;
+ if (test_bit(PPC4XX_ZERO_P, &sw_desc->flags)) {
+ iter =
+ ppc4xx_get_group_entry(sw_desc,
+ index++);
+ ppc4xx_adma_pq_zero_op(iter, chan,
+ paddr);
+ }
+
+ if (test_bit(PPC4XX_ZERO_Q, &sw_desc->flags)) {
+ iter =
+ ppc4xx_get_group_entry(sw_desc,
+ index++);
+ ppc4xx_adma_pq_zero_op(iter, chan,
+ qaddr);
+ }
+
+ return;
+ }
+ } else {
+ /* This is RXOR-only or RXOR/WXOR mixed chain */
+
+ /* If we want to include destination into calculations,
+ * then make dest addresses cued with mult=1 (XOR).
+ */
+ ppath = test_bit(PPC4XX_ZERO_P, &sw_desc->flags) ?
+ DMA_CUED_XOR_HB :
+ DMA_CUED_XOR_BASE | (1 << DMA_CUED_MULT1_OFF);
+ qpath = test_bit(PPC4XX_ZERO_Q, &sw_desc->flags) ?
+ DMA_CUED_XOR_HB :
+ DMA_CUED_XOR_BASE | (1 << DMA_CUED_MULT1_OFF);
+
+ /* Setup destination(s) in RXOR slot(s) */
+ iter = ppc4xx_get_group_entry(sw_desc, index++);
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ paddr ? ppath : qpath,
+ paddr ? paddr : qaddr, 0);
+ if (!addr) {
+ /* two destinations */
+ iter = ppc4xx_get_group_entry(sw_desc, index++);
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ qpath, qaddr, 0);
+ }
+
+ if (test_bit(PPC4XX_DESC_WXOR, &sw_desc->flags)) {
+ /* Setup destination(s) in remaining WXOR
+ * slots
+ */
+ iter = ppc4xx_get_group_entry(sw_desc, index);
+ if (addr) {
+ /* one destination */
+ list_for_each_entry_from(iter,
+ &sw_desc->
+ group_list,
+ chain_node)
+ ppc4xx_desc_set_dest_addr(iter,
+ chan,
+ DMA_CUED_XOR_BASE,
+ addr, 0);
+
+ } else {
+ /* two destinations */
+ list_for_each_entry_from(iter,
+ &sw_desc->
+ group_list,
+ chain_node) {
+ ppc4xx_desc_set_dest_addr
+ (iter, chan,
+ DMA_CUED_XOR_BASE, paddr,
+ 0);
+ ppc4xx_desc_set_dest_addr
+ (iter, chan,
+ DMA_CUED_XOR_BASE, qaddr,
+ 1);
+ }
+ }
+ }
+
+ }
+ break;
+
+ case PPC4XX_XOR_ID:
+ /* DMA2 descriptors have only 1 destination, so there are
+ * two chains - one for each dest.
+ * If we want to include destination into calculations,
+ * then make dest addresses cued with mult=1 (XOR).
+ */
+ ppath = test_bit(PPC4XX_ZERO_P, &sw_desc->flags) ?
+ DMA_CUED_XOR_HB :
+ DMA_CUED_XOR_BASE | (1 << DMA_CUED_MULT1_OFF);
+
+ qpath = test_bit(PPC4XX_ZERO_Q, &sw_desc->flags) ?
+ DMA_CUED_XOR_HB :
+ DMA_CUED_XOR_BASE | (1 << DMA_CUED_MULT1_OFF);
+
+ iter = ppc4xx_get_group_entry(sw_desc, 0);
+ for (i = 0; i < sw_desc->descs_per_op; i++) {
+ ppc4xx_desc_set_dest_addr(iter, chan,
+ paddr ? ppath : qpath,
+ paddr ? paddr : qaddr, 0);
+ iter = list_entry(iter->chain_node.next,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ }
+
+ if (!addr) {
+ /* Two destinations; setup Q here */
+ iter = ppc4xx_get_group_entry(sw_desc,
+ sw_desc->descs_per_op);
+ for (i = 0; i < sw_desc->descs_per_op; i++) {
+ ppc4xx_desc_set_dest_addr(iter,
+ chan, qpath, qaddr,
+ 0);
+ iter =
+ list_entry(iter->chain_node.next,
+ struct ppc4xx_adma_desc_slot,
+ chain_node);
+ }
+ }
+
+ break;
+ }
+}
+
+/**
+ * ppc4xx_dma2_pq_slot_count - get the number of slots necessary for
+ * DMA2 PQ operation
+ */
+static inline int ppc4xx_dma2_pq_slot_count(dma_addr_t * srcs, int src_cnt,
+ size_t len)
+{
+ signed long long order = 0;
+ int state = 0;
+ int addr_count = 0;
+ int i;
+ for (i = 1; i < src_cnt; i++) {
+ dma_addr_t cur_addr = srcs[i];
+ dma_addr_t old_addr = srcs[i - 1];
+ switch (state) {
+ case 0:
+ if (cur_addr == old_addr + len) {
+ /* direct RXOR */
+ order = 1;
+ state = 1;
+ if (i == src_cnt - 1)
+ addr_count++;
+ } else if (old_addr == cur_addr + len) {
+ /* reverse RXOR */
+ order = -1;
+ state = 1;
+ if (i == src_cnt - 1)
+ addr_count++;
+ } else {
+ state = 3;
+ }
+ break;
+ case 1:
+ if (i == src_cnt - 2 || (order == -1
+ && cur_addr !=
+ old_addr - len)) {
+ order = 0;
+ state = 0;
+ addr_count++;
+ } else if (cur_addr == old_addr + len * order) {
+ state = 2;
+ if (i == src_cnt - 1)
+ addr_count++;
+ } else if (cur_addr == old_addr + 2 * len) {
+ state = 2;
+ if (i == src_cnt - 1)
+ addr_count++;
+ } else if (cur_addr == old_addr + 3 * len) {
+ state = 2;
+ if (i == src_cnt - 1)
+ addr_count++;
+ } else {
+ order = 0;
+ state = 0;
+ addr_count++;
+ }
+ break;
+ case 2:
+ order = 0;
+ state = 0;
+ addr_count++;
+ break;
+ }
+ if (state == 3)
+ break;
+ }
+ if (src_cnt <= 1 || (state != 1 && state != 2)) {
+ pr_err("%s: src_cnt=%d, state=%d, addr_count=%d, order=%lld\n",
+ __func__, src_cnt, state, addr_count, order);
+ for (i = 0; i < src_cnt; i++)
+ pr_err("\t[%d] 0x%llx \n", i, srcs[i]);
+ BUG();
+ }
+
+ return (addr_count + XOR_MAX_OPS - 1) / XOR_MAX_OPS;
+}
+
+/**
+ * ppc4xx_adma_set_dest - set destination address into descriptor
+ */
+static inline void ppc4xx_adma_set_dest(struct ppc4xx_adma_desc_slot *sw_desc,
+ dma_addr_t addr, int index)
+{
+ struct ppc4xx_adma_chan *chan;
+
+ BUG_ON(index >= sw_desc->dst_cnt);
+
+ chan = to_ppc4xx_adma_chan(sw_desc->async_tx.chan);
+
+ switch (chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ /* to do: support transfers lengths >
+ * ppc4xx_adma_DMA/XOR_MAX_BYTE_COUNT
+ */
+ ppc4xx_desc_set_dest_addr(sw_desc->group_head,
+ chan, 0, addr, index);
+ break;
+ case PPC4XX_XOR_ID:
+ sw_desc = ppc4xx_get_group_entry(sw_desc, index);
+ ppc4xx_desc_set_dest_addr(sw_desc, chan, 0, addr, index);
+ break;
+ }
+}
+
+/**
+ * ppc4xx_desc_set_xor_src_cnt - set source count into descriptor
+ */
+static inline void ppc4xx_desc_set_xor_src_cnt(struct ppc4xx_adma_desc_slot
+ *desc, int src_cnt)
+{
+ struct xor_cb *hw_desc = desc->hw_desc;
+
+ hw_desc->cbc &= ~XOR_CDCR_OAC_MSK;
+ hw_desc->cbc |= src_cnt;
+}
+
+/**
+ * ppc4xx_adma_memcpy_xor_set_src - set source address into descriptor
+ */
+static inline void ppc4xx_adma_memcpy_xor_set_src(struct ppc4xx_adma_desc_slot
+ *sw_desc, dma_addr_t addr,
+ int index)
+{
+ struct ppc4xx_adma_chan *chan;
+
+ chan = to_ppc4xx_adma_chan(sw_desc->async_tx.chan);
+ sw_desc = sw_desc->group_head;
+
+ if (likely(sw_desc))
+ ppc4xx_desc_set_src_addr(sw_desc, chan, index, 0, addr);
+}
+
+/**
+ * ppc4xx_adma_dma2rxor_inc_addr -
+ */
+static inline void ppc4xx_adma_dma2rxor_inc_addr(struct ppc4xx_adma_desc_slot
+ *desc,
+ struct ppc4xx_rxor *cursor,
+ int index, int src_cnt)
+{
+ cursor->addr_count++;
+ if (index == src_cnt - 1) {
+ ppc4xx_desc_set_xor_src_cnt(desc, cursor->addr_count);
+ } else if (cursor->addr_count == XOR_MAX_OPS) {
+ ppc4xx_desc_set_xor_src_cnt(desc, cursor->addr_count);
+ cursor->addr_count = 0;
+ cursor->desc_count++;
+ }
+}
+
+/**
+ * ppc4xx_adma_dma2rxor_prep_src - setup RXOR types in DMA2 CDB
+ */
+static inline int ppc4xx_adma_dma2rxor_prep_src(struct ppc4xx_adma_desc_slot
+ *hdesc,
+ struct ppc4xx_rxor *cursor,
+ int index, int src_cnt,
+ u32 addr)
+{
+ int rval = 0;
+ u32 sign;
+ struct ppc4xx_adma_desc_slot *desc = hdesc;
+ int i;
+
+ for (i = 0; i < cursor->desc_count; i++) {
+ desc = list_entry(hdesc->chain_node.next,
+ struct ppc4xx_adma_desc_slot, chain_node);
+ }
+
+ switch (cursor->state) {
+ case 0:
+ if (addr == cursor->addrl + cursor->len) {
+ /* direct RXOR */
+ cursor->state = 1;
+ cursor->xor_count++;
+ if (index == src_cnt - 1) {
+ ppc4xx_rxor_set_region(desc,
+ cursor->addr_count,
+ DMA_RXOR12 <<
+ DMA_CUED_REGION_OFF);
+ ppc4xx_adma_dma2rxor_inc_addr(desc, cursor,
+ index, src_cnt);
+ }
+ } else if (cursor->addrl == addr + cursor->len) {
+ /* reverse RXOR */
+ cursor->state = 1;
+ cursor->xor_count++;
+ set_bit(cursor->addr_count, &desc->reverse_flags[0]);
+ if (index == src_cnt - 1) {
+ ppc4xx_rxor_set_region(desc,
+ cursor->addr_count,
+ DMA_RXOR12 <<
+ DMA_CUED_REGION_OFF);
+ ppc4xx_adma_dma2rxor_inc_addr(desc, cursor,
+ index, src_cnt);
+ }
+ } else {
+ printk(KERN_ERR "Cannot build "
+ "DMA2 RXOR command block.\n");
+ BUG();
+ }
+ break;
+ case 1:
+ sign = test_bit(cursor->addr_count, desc->reverse_flags)
+ ? -1 : 1;
+ if (index == src_cnt - 2 || (sign == -1
+ && addr !=
+ cursor->addrl - 2 * cursor->len)) {
+ cursor->state = 0;
+ cursor->xor_count = 1;
+ cursor->addrl = addr;
+ ppc4xx_rxor_set_region(desc,
+ cursor->addr_count,
+ DMA_RXOR12 <<
+ DMA_CUED_REGION_OFF);
+ ppc4xx_adma_dma2rxor_inc_addr(desc, cursor, index,
+ src_cnt);
+ } else if (addr == cursor->addrl + 2 * sign * cursor->len) {
+ cursor->state = 2;
+ cursor->xor_count = 0;
+ ppc4xx_rxor_set_region(desc,
+ cursor->addr_count,
+ DMA_RXOR123 <<
+ DMA_CUED_REGION_OFF);
+ if (index == src_cnt - 1) {
+ ppc4xx_adma_dma2rxor_inc_addr(desc, cursor,
+ index, src_cnt);
+ }
+ } else if (addr == cursor->addrl + 3 * cursor->len) {
+ cursor->state = 2;
+ cursor->xor_count = 0;
+ ppc4xx_rxor_set_region(desc,
+ cursor->addr_count,
+ DMA_RXOR124 <<
+ DMA_CUED_REGION_OFF);
+ if (index == src_cnt - 1) {
+ ppc4xx_adma_dma2rxor_inc_addr(desc, cursor,
+ index, src_cnt);
+ }
+ } else if (addr == cursor->addrl + 4 * cursor->len) {
+ cursor->state = 2;
+ cursor->xor_count = 0;
+ ppc4xx_rxor_set_region(desc,
+ cursor->addr_count,
+ DMA_RXOR125 <<
+ DMA_CUED_REGION_OFF);
+ if (index == src_cnt - 1) {
+ ppc4xx_adma_dma2rxor_inc_addr(desc, cursor,
+ index, src_cnt);
+ }
+ } else {
+ cursor->state = 0;
+ cursor->xor_count = 1;
+ cursor->addrl = addr;
+ ppc4xx_rxor_set_region(desc,
+ cursor->addr_count,
+ DMA_RXOR12 <<
+ DMA_CUED_REGION_OFF);
+ ppc4xx_adma_dma2rxor_inc_addr(desc, cursor, index,
+ src_cnt);
+ }
+ break;
+ case 2:
+ cursor->state = 0;
+ cursor->addrl = addr;
+ cursor->xor_count++;
+ if (index) {
+ ppc4xx_adma_dma2rxor_inc_addr(desc, cursor, index,
+ src_cnt);
+ }
+ break;
+ }
+
+ return rval;
+}
+
+static void ppc4xx_adma_set_dest(struct ppc4xx_adma_desc_slot *sw_desc,
+ dma_addr_t addr, int index);
+static void ppc4xx_adma_memcpy_xor_set_src(struct ppc4xx_adma_desc_slot
+ *sw_desc, dma_addr_t addr,
+ int index);
+
+static inline void ppc4xx_free_ref(struct ppc4xx_adma_device *adev,
+ struct platform_device *ofdev,
+ struct ppc4xx_adma_chan *chan)
+{
+ if (adev->id != PPC4XX_XOR_ID) {
+ dma_unmap_page(&ofdev->dev, chan->pdest,
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+ dma_unmap_page(&ofdev->dev, chan->qdest,
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+ __free_page(chan->pdest_page);
+ __free_page(chan->qdest_page);
+ }
+}
+static inline void ppc4xx_free_reg(struct ppc4xx_adma_device *adev)
+{
+ if (adev->id == PPC4XX_XOR_ID)
+ iounmap(adev->xor_reg);
+ else
+ iounmap(adev->dma_reg);
+}
+static inline int ppc4xx_get_cdb_size(struct ppc4xx_adma_chan *ppc4xx_chan)
+{
+ int db_sz;
+ if (ppc4xx_chan->device->id != PPC4XX_XOR_ID)
+ db_sz = sizeof(struct dma_cdb);
+ else
+ db_sz = sizeof(struct xor_cb);
+ return db_sz;
+}
+
+/*
+ * initialize the channel and the chain with a null operation
+ */
+static inline void ppc4xx_init_chan_null_op(struct ppc4xx_adma_chan
+ *ppc4xx_chan)
+{
+ switch (ppc4xx_chan->device->id) {
+ case PPC4XX_DMA0_ID:
+ case PPC4XX_DMA1_ID:
+ ppc4xx_chan->hw_chain_inited = 0;
+ /* Use WXOR for self-testing */
+ if (!ppc4xx_r6_tchan)
+ ppc4xx_r6_tchan = ppc4xx_chan;
+ break;
+ case PPC4XX_XOR_ID:
+ ppc4xx_chan_start_null_xor(ppc4xx_chan);
+ break;
+ default:
+ BUG();
+ }
+}
+static inline int ppc4xx_adma_get_devid(struct platform_device *ofdev,
+ struct device_node *np)
+{
+ unsigned int id;
+ unsigned int len;
+ const unsigned int *idx;
+ if (of_device_is_compatible(np, "amcc,xor-accelerator")) {
+ id = PPC4XX_XOR_ID;
+ } else {
+ /* it is DMA0 or DMA1 */
+ idx = of_get_property(np, "cell-index", &len);
+ /* it is DMA0 or DMA1 */
+ if (!idx || (len != sizeof(u32))) {
+ dev_err(&ofdev->dev, "Device node %s has missing "
+ "or invalid cell-index property\n",
+ np->full_name);
+ return -EINVAL;
+ }
+ id = *idx;
+ }
+ return id;
+}
+static inline int ppc4xx_adma_get_pool_size(struct device_node *np, int id)
+{
+ unsigned int pool_size;
+ if (of_device_is_compatible(np, "amcc,xor-accelerator")) {
+ /* As far as the XOR engine is concerned, it does not
+ * use FIFOs but uses linked list. So there is no dependency
+ * between pool size to allocate and the engine configuration.
+ */
+ pool_size = PAGE_SIZE << 1;
+ } else {
+ /* DMA0,1 engines use FIFO to maintain CDBs, so we
+ * should allocate the pool accordingly to size of this
+ * FIFO. Thus, the pool size depends on the FIFO depth:
+ * how much CDBs pointers the FIFO may contain then so
+ * much CDBs we should provide in the pool.
+ * That is
+ * CDB size = 32B;
+ * CDBs number = (DMA0_FIFO_SIZE >> 3);
+ * Pool size = CDBs number * CDB size =
+ * = (DMA0_FIFO_SIZE >> 3) << 5 = DMA0_FIFO_SIZE << 2.
+ */
+ pool_size = (id == PPC4XX_DMA0_ID) ?
+ DMA0_FIFO_SIZE : DMA1_FIFO_SIZE;
+ pool_size <<= 2;
+ }
+ return pool_size;
+}
+static inline void ppc4xx_adma_init_hw(struct ppc4xx_adma_device *adev,
+ void *regs)
+{
+ if (adev->id == PPC4XX_XOR_ID) {
+ adev->xor_reg = regs;
+ /* Reset XOR */
+ iowrite32be(XOR_CRSR_XASR_BIT, &adev->xor_reg->crsr);
+ iowrite32be(XOR_CRSR_64BA_BIT, &adev->xor_reg->crrr);
+ } else {
+ size_t fifo_size = (adev->id == PPC4XX_DMA0_ID) ?
+ DMA0_FIFO_SIZE : DMA1_FIFO_SIZE;
+ adev->dma_reg = regs;
+ /* DMAx_FIFO_SIZE is defined in bytes,
+ * <fsiz> - is defined in number of CDB pointers (8byte).
+ * DMA FIFO Length = CSlength + CPlength, where
+ * CSlength = CPlength = (fsiz + 1) * 8.
+ */
+ iowrite32(DMA_FIFO_ENABLE | ((fifo_size >> 3) - 2),
+ &adev->dma_reg->fsiz);
+ /* Configure DMA engine */
+ iowrite32(DMA_CFG_DXEPR_HP | DMA_CFG_DFMPP_HP | DMA_CFG_FALGN,
+ &adev->dma_reg->cfg);
+ /* Clear Status */
+ iowrite32(~0, &adev->dma_reg->dsts);
+ }
+}
+static inline int ppc4xx_create_helper_pages(struct ppc4xx_adma_device *adev,
+ struct platform_device *ofdev,
+ struct ppc4xx_adma_chan *chan)
+{
+ int ret = 0;
+ /* allocate and map helper pages for async validation or
+ * async_mult/async_sum_product operations on DMA0/1.
+ */
+ if (adev->id != PPC4XX_XOR_ID) {
+ chan->pdest_page = alloc_page(GFP_KERNEL);
+ chan->qdest_page = alloc_page(GFP_KERNEL);
+ if (!chan->pdest_page || !chan->qdest_page) {
+ if (chan->pdest_page)
+ __free_page(chan->pdest_page);
+ if (chan->qdest_page)
+ __free_page(chan->qdest_page);
+ ret = -ENOMEM;
+ goto err_page_alloc;
+ }
+ chan->pdest = dma_map_page(&ofdev->dev, chan->pdest_page, 0,
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+ chan->qdest = dma_map_page(&ofdev->dev, chan->qdest_page, 0,
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+ }
+ err_page_alloc:
+ return ret;
+}
+
+#endif /*__PPC4XX_ADMA_H*/
--
1.6.1.rc3