| /* |
| * offload engine driver for the Marvell XOR engine |
| * Copyright (C) 2007, 2008, Marvell International Ltd. |
| * |
| * 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. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/delay.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/spinlock.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/memory.h> |
| #include <linux/clk.h> |
| #include <linux/of.h> |
| #include <linux/of_irq.h> |
| #include <linux/irqdomain.h> |
| #include <linux/platform_data/dma-mv_xor.h> |
| |
| #include "dmaengine.h" |
| #include "mv_xor.h" |
| |
| static void mv_xor_issue_pending(struct dma_chan *chan); |
| |
| #define to_mv_xor_chan(chan) \ |
| container_of(chan, struct mv_xor_chan, dmachan) |
| |
| #define to_mv_xor_slot(tx) \ |
| container_of(tx, struct mv_xor_desc_slot, async_tx) |
| |
| #define mv_chan_to_devp(chan) \ |
| ((chan)->dmadev.dev) |
| |
| static void mv_desc_init(struct mv_xor_desc_slot *desc, unsigned long flags) |
| { |
| struct mv_xor_desc *hw_desc = desc->hw_desc; |
| |
| hw_desc->status = (1 << 31); |
| hw_desc->phy_next_desc = 0; |
| hw_desc->desc_command = (1 << 31); |
| } |
| |
| static void mv_desc_set_byte_count(struct mv_xor_desc_slot *desc, |
| u32 byte_count) |
| { |
| struct mv_xor_desc *hw_desc = desc->hw_desc; |
| hw_desc->byte_count = byte_count; |
| } |
| |
| static void mv_desc_set_next_desc(struct mv_xor_desc_slot *desc, |
| u32 next_desc_addr) |
| { |
| struct mv_xor_desc *hw_desc = desc->hw_desc; |
| BUG_ON(hw_desc->phy_next_desc); |
| hw_desc->phy_next_desc = next_desc_addr; |
| } |
| |
| static void mv_desc_clear_next_desc(struct mv_xor_desc_slot *desc) |
| { |
| struct mv_xor_desc *hw_desc = desc->hw_desc; |
| hw_desc->phy_next_desc = 0; |
| } |
| |
| static void mv_desc_set_dest_addr(struct mv_xor_desc_slot *desc, |
| dma_addr_t addr) |
| { |
| struct mv_xor_desc *hw_desc = desc->hw_desc; |
| hw_desc->phy_dest_addr = addr; |
| } |
| |
| static int mv_chan_memset_slot_count(size_t len) |
| { |
| return 1; |
| } |
| |
| #define mv_chan_memcpy_slot_count(c) mv_chan_memset_slot_count(c) |
| |
| static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc, |
| int index, dma_addr_t addr) |
| { |
| struct mv_xor_desc *hw_desc = desc->hw_desc; |
| hw_desc->phy_src_addr[mv_phy_src_idx(index)] = addr; |
| if (desc->type == DMA_XOR) |
| hw_desc->desc_command |= (1 << index); |
| } |
| |
| static u32 mv_chan_get_current_desc(struct mv_xor_chan *chan) |
| { |
| return readl_relaxed(XOR_CURR_DESC(chan)); |
| } |
| |
| static void mv_chan_set_next_descriptor(struct mv_xor_chan *chan, |
| u32 next_desc_addr) |
| { |
| writel_relaxed(next_desc_addr, XOR_NEXT_DESC(chan)); |
| } |
| |
| static void mv_chan_unmask_interrupts(struct mv_xor_chan *chan) |
| { |
| u32 val = readl_relaxed(XOR_INTR_MASK(chan)); |
| val |= XOR_INTR_MASK_VALUE << (chan->idx * 16); |
| writel_relaxed(val, XOR_INTR_MASK(chan)); |
| } |
| |
| static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan) |
| { |
| u32 intr_cause = readl_relaxed(XOR_INTR_CAUSE(chan)); |
| intr_cause = (intr_cause >> (chan->idx * 16)) & 0xFFFF; |
| return intr_cause; |
| } |
| |
| static int mv_is_err_intr(u32 intr_cause) |
| { |
| if (intr_cause & ((1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9))) |
| return 1; |
| |
| return 0; |
| } |
| |
| static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan) |
| { |
| u32 val = ~(1 << (chan->idx * 16)); |
| dev_dbg(mv_chan_to_devp(chan), "%s, val 0x%08x\n", __func__, val); |
| writel_relaxed(val, XOR_INTR_CAUSE(chan)); |
| } |
| |
| static void mv_xor_device_clear_err_status(struct mv_xor_chan *chan) |
| { |
| u32 val = 0xFFFF0000 >> (chan->idx * 16); |
| writel_relaxed(val, XOR_INTR_CAUSE(chan)); |
| } |
| |
| static int mv_can_chain(struct mv_xor_desc_slot *desc) |
| { |
| struct mv_xor_desc_slot *chain_old_tail = list_entry( |
| desc->chain_node.prev, struct mv_xor_desc_slot, chain_node); |
| |
| if (chain_old_tail->type != desc->type) |
| return 0; |
| |
| return 1; |
| } |
| |
| static void mv_set_mode(struct mv_xor_chan *chan, |
| enum dma_transaction_type type) |
| { |
| u32 op_mode; |
| u32 config = readl_relaxed(XOR_CONFIG(chan)); |
| |
| switch (type) { |
| case DMA_XOR: |
| op_mode = XOR_OPERATION_MODE_XOR; |
| break; |
| case DMA_MEMCPY: |
| op_mode = XOR_OPERATION_MODE_MEMCPY; |
| break; |
| default: |
| dev_err(mv_chan_to_devp(chan), |
| "error: unsupported operation %d\n", |
| type); |
| BUG(); |
| return; |
| } |
| |
| config &= ~0x7; |
| config |= op_mode; |
| |
| #if defined(__BIG_ENDIAN) |
| config |= XOR_DESCRIPTOR_SWAP; |
| #else |
| config &= ~XOR_DESCRIPTOR_SWAP; |
| #endif |
| |
| writel_relaxed(config, XOR_CONFIG(chan)); |
| chan->current_type = type; |
| } |
| |
| static void mv_chan_activate(struct mv_xor_chan *chan) |
| { |
| dev_dbg(mv_chan_to_devp(chan), " activate chan.\n"); |
| |
| /* writel ensures all descriptors are flushed before activation */ |
| writel(BIT(0), XOR_ACTIVATION(chan)); |
| } |
| |
| static char mv_chan_is_busy(struct mv_xor_chan *chan) |
| { |
| u32 state = readl_relaxed(XOR_ACTIVATION(chan)); |
| |
| state = (state >> 4) & 0x3; |
| |
| return (state == 1) ? 1 : 0; |
| } |
| |
| static int mv_chan_xor_slot_count(size_t len, int src_cnt) |
| { |
| return 1; |
| } |
| |
| /** |
| * mv_xor_free_slots - flags descriptor slots for reuse |
| * @slot: Slot to free |
| * Caller must hold &mv_chan->lock while calling this function |
| */ |
| static void mv_xor_free_slots(struct mv_xor_chan *mv_chan, |
| struct mv_xor_desc_slot *slot) |
| { |
| dev_dbg(mv_chan_to_devp(mv_chan), "%s %d slot %p\n", |
| __func__, __LINE__, slot); |
| |
| slot->slots_per_op = 0; |
| |
| } |
| |
| /* |
| * mv_xor_start_new_chain - program the engine to operate on new chain headed by |
| * sw_desc |
| * Caller must hold &mv_chan->lock while calling this function |
| */ |
| static void mv_xor_start_new_chain(struct mv_xor_chan *mv_chan, |
| struct mv_xor_desc_slot *sw_desc) |
| { |
| dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: sw_desc %p\n", |
| __func__, __LINE__, sw_desc); |
| if (sw_desc->type != mv_chan->current_type) |
| mv_set_mode(mv_chan, sw_desc->type); |
| |
| /* set the hardware chain */ |
| mv_chan_set_next_descriptor(mv_chan, sw_desc->async_tx.phys); |
| |
| mv_chan->pending += sw_desc->slot_cnt; |
| mv_xor_issue_pending(&mv_chan->dmachan); |
| } |
| |
| static dma_cookie_t |
| mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc, |
| struct mv_xor_chan *mv_chan, dma_cookie_t cookie) |
| { |
| BUG_ON(desc->async_tx.cookie < 0); |
| |
| if (desc->async_tx.cookie > 0) { |
| cookie = desc->async_tx.cookie; |
| |
| /* call the callback (must not sleep or submit new |
| * operations to this channel) |
| */ |
| if (desc->async_tx.callback) |
| desc->async_tx.callback( |
| desc->async_tx.callback_param); |
| |
| dma_descriptor_unmap(&desc->async_tx); |
| if (desc->group_head) |
| desc->group_head = NULL; |
| } |
| |
| /* run dependent operations */ |
| dma_run_dependencies(&desc->async_tx); |
| |
| return cookie; |
| } |
| |
| static int |
| mv_xor_clean_completed_slots(struct mv_xor_chan *mv_chan) |
| { |
| struct mv_xor_desc_slot *iter, *_iter; |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__); |
| list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots, |
| completed_node) { |
| |
| if (async_tx_test_ack(&iter->async_tx)) { |
| list_del(&iter->completed_node); |
| mv_xor_free_slots(mv_chan, iter); |
| } |
| } |
| return 0; |
| } |
| |
| static int |
| mv_xor_clean_slot(struct mv_xor_desc_slot *desc, |
| struct mv_xor_chan *mv_chan) |
| { |
| dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: desc %p flags %d\n", |
| __func__, __LINE__, desc, desc->async_tx.flags); |
| list_del(&desc->chain_node); |
| /* the client is allowed to attach dependent operations |
| * until 'ack' is set |
| */ |
| if (!async_tx_test_ack(&desc->async_tx)) { |
| /* move this slot to the completed_slots */ |
| list_add_tail(&desc->completed_node, &mv_chan->completed_slots); |
| return 0; |
| } |
| |
| mv_xor_free_slots(mv_chan, desc); |
| return 0; |
| } |
| |
| /* This function must be called with the mv_xor_chan spinlock held */ |
| static void mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan) |
| { |
| struct mv_xor_desc_slot *iter, *_iter; |
| dma_cookie_t cookie = 0; |
| int busy = mv_chan_is_busy(mv_chan); |
| u32 current_desc = mv_chan_get_current_desc(mv_chan); |
| int seen_current = 0; |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__); |
| dev_dbg(mv_chan_to_devp(mv_chan), "current_desc %x\n", current_desc); |
| mv_xor_clean_completed_slots(mv_chan); |
| |
| /* free completed slots from the chain starting with |
| * the oldest descriptor |
| */ |
| |
| list_for_each_entry_safe(iter, _iter, &mv_chan->chain, |
| chain_node) { |
| prefetch(_iter); |
| prefetch(&_iter->async_tx); |
| |
| /* do not advance past the current descriptor loaded into the |
| * hardware channel, subsequent descriptors are either in |
| * process or have not been submitted |
| */ |
| if (seen_current) |
| break; |
| |
| /* stop the search if we reach the current descriptor and the |
| * channel is busy |
| */ |
| if (iter->async_tx.phys == current_desc) { |
| seen_current = 1; |
| if (busy) |
| break; |
| } |
| |
| cookie = mv_xor_run_tx_complete_actions(iter, mv_chan, cookie); |
| |
| if (mv_xor_clean_slot(iter, mv_chan)) |
| break; |
| } |
| |
| if ((busy == 0) && !list_empty(&mv_chan->chain)) { |
| struct mv_xor_desc_slot *chain_head; |
| chain_head = list_entry(mv_chan->chain.next, |
| struct mv_xor_desc_slot, |
| chain_node); |
| |
| mv_xor_start_new_chain(mv_chan, chain_head); |
| } |
| |
| if (cookie > 0) |
| mv_chan->dmachan.completed_cookie = cookie; |
| } |
| |
| static void mv_xor_tasklet(unsigned long data) |
| { |
| struct mv_xor_chan *chan = (struct mv_xor_chan *) data; |
| |
| spin_lock_bh(&chan->lock); |
| mv_xor_slot_cleanup(chan); |
| spin_unlock_bh(&chan->lock); |
| } |
| |
| static struct mv_xor_desc_slot * |
| mv_xor_alloc_slots(struct mv_xor_chan *mv_chan, int num_slots, |
| int slots_per_op) |
| { |
| struct mv_xor_desc_slot *iter, *_iter, *alloc_start = NULL; |
| LIST_HEAD(chain); |
| int slots_found, retry = 0; |
| |
| /* start search from the last allocated descrtiptor |
| * if a contiguous allocation can not be found start searching |
| * from the beginning of the list |
| */ |
| retry: |
| slots_found = 0; |
| if (retry == 0) |
| iter = mv_chan->last_used; |
| else |
| iter = list_entry(&mv_chan->all_slots, |
| struct mv_xor_desc_slot, |
| slot_node); |
| |
| list_for_each_entry_safe_continue( |
| iter, _iter, &mv_chan->all_slots, slot_node) { |
| prefetch(_iter); |
| prefetch(&_iter->async_tx); |
| if (iter->slots_per_op) { |
| /* give up after finding the first busy slot |
| * on the second pass through the list |
| */ |
| if (retry) |
| break; |
| |
| slots_found = 0; |
| continue; |
| } |
| |
| /* start the allocation if the slot is correctly aligned */ |
| if (!slots_found++) |
| alloc_start = iter; |
| |
| if (slots_found == num_slots) { |
| struct mv_xor_desc_slot *alloc_tail = NULL; |
| struct mv_xor_desc_slot *last_used = NULL; |
| iter = alloc_start; |
| while (num_slots) { |
| int i; |
| |
| /* pre-ack all but the last descriptor */ |
| async_tx_ack(&iter->async_tx); |
| |
| list_add_tail(&iter->chain_node, &chain); |
| alloc_tail = iter; |
| iter->async_tx.cookie = 0; |
| iter->slot_cnt = num_slots; |
| iter->xor_check_result = NULL; |
| for (i = 0; i < slots_per_op; i++) { |
| iter->slots_per_op = slots_per_op - i; |
| last_used = iter; |
| iter = list_entry(iter->slot_node.next, |
| struct mv_xor_desc_slot, |
| slot_node); |
| } |
| num_slots -= slots_per_op; |
| } |
| alloc_tail->group_head = alloc_start; |
| alloc_tail->async_tx.cookie = -EBUSY; |
| list_splice(&chain, &alloc_tail->tx_list); |
| mv_chan->last_used = last_used; |
| mv_desc_clear_next_desc(alloc_start); |
| mv_desc_clear_next_desc(alloc_tail); |
| return alloc_tail; |
| } |
| } |
| if (!retry++) |
| goto retry; |
| |
| /* try to free some slots if the allocation fails */ |
| tasklet_schedule(&mv_chan->irq_tasklet); |
| |
| return NULL; |
| } |
| |
| /************************ DMA engine API functions ****************************/ |
| static dma_cookie_t |
| mv_xor_tx_submit(struct dma_async_tx_descriptor *tx) |
| { |
| struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx); |
| struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan); |
| struct mv_xor_desc_slot *grp_start, *old_chain_tail; |
| dma_cookie_t cookie; |
| int new_hw_chain = 1; |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), |
| "%s sw_desc %p: async_tx %p\n", |
| __func__, sw_desc, &sw_desc->async_tx); |
| |
| grp_start = sw_desc->group_head; |
| |
| spin_lock_bh(&mv_chan->lock); |
| cookie = dma_cookie_assign(tx); |
| |
| if (list_empty(&mv_chan->chain)) |
| list_splice_init(&sw_desc->tx_list, &mv_chan->chain); |
| else { |
| new_hw_chain = 0; |
| |
| old_chain_tail = list_entry(mv_chan->chain.prev, |
| struct mv_xor_desc_slot, |
| chain_node); |
| list_splice_init(&grp_start->tx_list, |
| &old_chain_tail->chain_node); |
| |
| if (!mv_can_chain(grp_start)) |
| goto submit_done; |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), "Append to last desc %pa\n", |
| &old_chain_tail->async_tx.phys); |
| |
| /* fix up the hardware chain */ |
| mv_desc_set_next_desc(old_chain_tail, grp_start->async_tx.phys); |
| |
| /* if the channel is not busy */ |
| if (!mv_chan_is_busy(mv_chan)) { |
| u32 current_desc = mv_chan_get_current_desc(mv_chan); |
| /* |
| * and the curren desc is the end of the chain before |
| * the append, then we need to start the channel |
| */ |
| if (current_desc == old_chain_tail->async_tx.phys) |
| new_hw_chain = 1; |
| } |
| } |
| |
| if (new_hw_chain) |
| mv_xor_start_new_chain(mv_chan, grp_start); |
| |
| submit_done: |
| spin_unlock_bh(&mv_chan->lock); |
| |
| return cookie; |
| } |
| |
| /* returns the number of allocated descriptors */ |
| static int mv_xor_alloc_chan_resources(struct dma_chan *chan) |
| { |
| void *virt_desc; |
| dma_addr_t dma_desc; |
| int idx; |
| struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); |
| struct mv_xor_desc_slot *slot = NULL; |
| int num_descs_in_pool = MV_XOR_POOL_SIZE/MV_XOR_SLOT_SIZE; |
| |
| /* Allocate descriptor slots */ |
| idx = mv_chan->slots_allocated; |
| while (idx < num_descs_in_pool) { |
| slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
| if (!slot) { |
| printk(KERN_INFO "MV XOR Channel only initialized" |
| " %d descriptor slots", idx); |
| break; |
| } |
| virt_desc = mv_chan->dma_desc_pool_virt; |
| slot->hw_desc = virt_desc + idx * MV_XOR_SLOT_SIZE; |
| |
| dma_async_tx_descriptor_init(&slot->async_tx, chan); |
| slot->async_tx.tx_submit = mv_xor_tx_submit; |
| INIT_LIST_HEAD(&slot->chain_node); |
| INIT_LIST_HEAD(&slot->slot_node); |
| INIT_LIST_HEAD(&slot->tx_list); |
| dma_desc = mv_chan->dma_desc_pool; |
| slot->async_tx.phys = dma_desc + idx * MV_XOR_SLOT_SIZE; |
| slot->idx = idx++; |
| |
| spin_lock_bh(&mv_chan->lock); |
| mv_chan->slots_allocated = idx; |
| list_add_tail(&slot->slot_node, &mv_chan->all_slots); |
| spin_unlock_bh(&mv_chan->lock); |
| } |
| |
| if (mv_chan->slots_allocated && !mv_chan->last_used) |
| mv_chan->last_used = list_entry(mv_chan->all_slots.next, |
| struct mv_xor_desc_slot, |
| slot_node); |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), |
| "allocated %d descriptor slots last_used: %p\n", |
| mv_chan->slots_allocated, mv_chan->last_used); |
| |
| return mv_chan->slots_allocated ? : -ENOMEM; |
| } |
| |
| static struct dma_async_tx_descriptor * |
| mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, |
| size_t len, unsigned long flags) |
| { |
| struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); |
| struct mv_xor_desc_slot *sw_desc, *grp_start; |
| int slot_cnt; |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), |
| "%s dest: %pad src %pad len: %u flags: %ld\n", |
| __func__, &dest, &src, len, flags); |
| if (unlikely(len < MV_XOR_MIN_BYTE_COUNT)) |
| return NULL; |
| |
| BUG_ON(len > MV_XOR_MAX_BYTE_COUNT); |
| |
| spin_lock_bh(&mv_chan->lock); |
| slot_cnt = mv_chan_memcpy_slot_count(len); |
| sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1); |
| if (sw_desc) { |
| sw_desc->type = DMA_MEMCPY; |
| sw_desc->async_tx.flags = flags; |
| grp_start = sw_desc->group_head; |
| mv_desc_init(grp_start, flags); |
| mv_desc_set_byte_count(grp_start, len); |
| mv_desc_set_dest_addr(sw_desc->group_head, dest); |
| mv_desc_set_src_addr(grp_start, 0, src); |
| sw_desc->unmap_src_cnt = 1; |
| sw_desc->unmap_len = len; |
| } |
| spin_unlock_bh(&mv_chan->lock); |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), |
| "%s sw_desc %p async_tx %p\n", |
| __func__, sw_desc, sw_desc ? &sw_desc->async_tx : NULL); |
| |
| return sw_desc ? &sw_desc->async_tx : NULL; |
| } |
| |
| static struct dma_async_tx_descriptor * |
| mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, |
| unsigned int src_cnt, size_t len, unsigned long flags) |
| { |
| struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); |
| struct mv_xor_desc_slot *sw_desc, *grp_start; |
| int slot_cnt; |
| |
| if (unlikely(len < MV_XOR_MIN_BYTE_COUNT)) |
| return NULL; |
| |
| BUG_ON(len > MV_XOR_MAX_BYTE_COUNT); |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), |
| "%s src_cnt: %d len: %u dest %pad flags: %ld\n", |
| __func__, src_cnt, len, &dest, flags); |
| |
| spin_lock_bh(&mv_chan->lock); |
| slot_cnt = mv_chan_xor_slot_count(len, src_cnt); |
| sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1); |
| if (sw_desc) { |
| sw_desc->type = DMA_XOR; |
| sw_desc->async_tx.flags = flags; |
| grp_start = sw_desc->group_head; |
| mv_desc_init(grp_start, flags); |
| /* the byte count field is the same as in memcpy desc*/ |
| mv_desc_set_byte_count(grp_start, len); |
| mv_desc_set_dest_addr(sw_desc->group_head, dest); |
| sw_desc->unmap_src_cnt = src_cnt; |
| sw_desc->unmap_len = len; |
| while (src_cnt--) |
| mv_desc_set_src_addr(grp_start, src_cnt, src[src_cnt]); |
| } |
| spin_unlock_bh(&mv_chan->lock); |
| dev_dbg(mv_chan_to_devp(mv_chan), |
| "%s sw_desc %p async_tx %p \n", |
| __func__, sw_desc, &sw_desc->async_tx); |
| return sw_desc ? &sw_desc->async_tx : NULL; |
| } |
| |
| static void mv_xor_free_chan_resources(struct dma_chan *chan) |
| { |
| struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); |
| struct mv_xor_desc_slot *iter, *_iter; |
| int in_use_descs = 0; |
| |
| spin_lock_bh(&mv_chan->lock); |
| |
| mv_xor_slot_cleanup(mv_chan); |
| |
| list_for_each_entry_safe(iter, _iter, &mv_chan->chain, |
| chain_node) { |
| in_use_descs++; |
| list_del(&iter->chain_node); |
| } |
| list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots, |
| completed_node) { |
| in_use_descs++; |
| list_del(&iter->completed_node); |
| } |
| list_for_each_entry_safe_reverse( |
| iter, _iter, &mv_chan->all_slots, slot_node) { |
| list_del(&iter->slot_node); |
| kfree(iter); |
| mv_chan->slots_allocated--; |
| } |
| mv_chan->last_used = NULL; |
| |
| dev_dbg(mv_chan_to_devp(mv_chan), "%s slots_allocated %d\n", |
| __func__, mv_chan->slots_allocated); |
| spin_unlock_bh(&mv_chan->lock); |
| |
| if (in_use_descs) |
| dev_err(mv_chan_to_devp(mv_chan), |
| "freeing %d in use descriptors!\n", in_use_descs); |
| } |
| |
| /** |
| * mv_xor_status - poll the status of an XOR transaction |
| * @chan: XOR channel handle |
| * @cookie: XOR transaction identifier |
| * @txstate: XOR transactions state holder (or NULL) |
| */ |
| static enum dma_status mv_xor_status(struct dma_chan *chan, |
| dma_cookie_t cookie, |
| struct dma_tx_state *txstate) |
| { |
| struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); |
| enum dma_status ret; |
| |
| ret = dma_cookie_status(chan, cookie, txstate); |
| if (ret == DMA_COMPLETE) |
| return ret; |
| |
| spin_lock_bh(&mv_chan->lock); |
| mv_xor_slot_cleanup(mv_chan); |
| spin_unlock_bh(&mv_chan->lock); |
| |
| return dma_cookie_status(chan, cookie, txstate); |
| } |
| |
| static void mv_dump_xor_regs(struct mv_xor_chan *chan) |
| { |
| u32 val; |
| |
| val = readl_relaxed(XOR_CONFIG(chan)); |
| dev_err(mv_chan_to_devp(chan), "config 0x%08x\n", val); |
| |
| val = readl_relaxed(XOR_ACTIVATION(chan)); |
| dev_err(mv_chan_to_devp(chan), "activation 0x%08x\n", val); |
| |
| val = readl_relaxed(XOR_INTR_CAUSE(chan)); |
| dev_err(mv_chan_to_devp(chan), "intr cause 0x%08x\n", val); |
| |
| val = readl_relaxed(XOR_INTR_MASK(chan)); |
| dev_err(mv_chan_to_devp(chan), "intr mask 0x%08x\n", val); |
| |
| val = readl_relaxed(XOR_ERROR_CAUSE(chan)); |
| dev_err(mv_chan_to_devp(chan), "error cause 0x%08x\n", val); |
| |
| val = readl_relaxed(XOR_ERROR_ADDR(chan)); |
| dev_err(mv_chan_to_devp(chan), "error addr 0x%08x\n", val); |
| } |
| |
| static void mv_xor_err_interrupt_handler(struct mv_xor_chan *chan, |
| u32 intr_cause) |
| { |
| if (intr_cause & (1 << 4)) { |
| dev_dbg(mv_chan_to_devp(chan), |
| "ignore this error\n"); |
| return; |
| } |
| |
| dev_err(mv_chan_to_devp(chan), |
| "error on chan %d. intr cause 0x%08x\n", |
| chan->idx, intr_cause); |
| |
| mv_dump_xor_regs(chan); |
| BUG(); |
| } |
| |
| static irqreturn_t mv_xor_interrupt_handler(int irq, void *data) |
| { |
| struct mv_xor_chan *chan = data; |
| u32 intr_cause = mv_chan_get_intr_cause(chan); |
| |
| dev_dbg(mv_chan_to_devp(chan), "intr cause %x\n", intr_cause); |
| |
| if (mv_is_err_intr(intr_cause)) |
| mv_xor_err_interrupt_handler(chan, intr_cause); |
| |
| tasklet_schedule(&chan->irq_tasklet); |
| |
| mv_xor_device_clear_eoc_cause(chan); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void mv_xor_issue_pending(struct dma_chan *chan) |
| { |
| struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); |
| |
| if (mv_chan->pending >= MV_XOR_THRESHOLD) { |
| mv_chan->pending = 0; |
| mv_chan_activate(mv_chan); |
| } |
| } |
| |
| /* |
| * Perform a transaction to verify the HW works. |
| */ |
| |
| static int mv_xor_memcpy_self_test(struct mv_xor_chan *mv_chan) |
| { |
| int i, ret; |
| void *src, *dest; |
| dma_addr_t src_dma, dest_dma; |
| struct dma_chan *dma_chan; |
| dma_cookie_t cookie; |
| struct dma_async_tx_descriptor *tx; |
| struct dmaengine_unmap_data *unmap; |
| int err = 0; |
| |
| src = kmalloc(sizeof(u8) * PAGE_SIZE, GFP_KERNEL); |
| if (!src) |
| return -ENOMEM; |
| |
| dest = kzalloc(sizeof(u8) * PAGE_SIZE, GFP_KERNEL); |
| if (!dest) { |
| kfree(src); |
| return -ENOMEM; |
| } |
| |
| /* Fill in src buffer */ |
| for (i = 0; i < PAGE_SIZE; i++) |
| ((u8 *) src)[i] = (u8)i; |
| |
| dma_chan = &mv_chan->dmachan; |
| if (mv_xor_alloc_chan_resources(dma_chan) < 1) { |
| err = -ENODEV; |
| goto out; |
| } |
| |
| unmap = dmaengine_get_unmap_data(dma_chan->device->dev, 2, GFP_KERNEL); |
| if (!unmap) { |
| err = -ENOMEM; |
| goto free_resources; |
| } |
| |
| src_dma = dma_map_page(dma_chan->device->dev, virt_to_page(src), 0, |
| PAGE_SIZE, DMA_TO_DEVICE); |
| unmap->addr[0] = src_dma; |
| |
| ret = dma_mapping_error(dma_chan->device->dev, src_dma); |
| if (ret) { |
| err = -ENOMEM; |
| goto free_resources; |
| } |
| unmap->to_cnt = 1; |
| |
| dest_dma = dma_map_page(dma_chan->device->dev, virt_to_page(dest), 0, |
| PAGE_SIZE, DMA_FROM_DEVICE); |
| unmap->addr[1] = dest_dma; |
| |
| ret = dma_mapping_error(dma_chan->device->dev, dest_dma); |
| if (ret) { |
| err = -ENOMEM; |
| goto free_resources; |
| } |
| unmap->from_cnt = 1; |
| unmap->len = PAGE_SIZE; |
| |
| tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma, |
| PAGE_SIZE, 0); |
| if (!tx) { |
| dev_err(dma_chan->device->dev, |
| "Self-test cannot prepare operation, disabling\n"); |
| err = -ENODEV; |
| goto free_resources; |
| } |
| |
| cookie = mv_xor_tx_submit(tx); |
| if (dma_submit_error(cookie)) { |
| dev_err(dma_chan->device->dev, |
| "Self-test submit error, disabling\n"); |
| err = -ENODEV; |
| goto free_resources; |
| } |
| |
| mv_xor_issue_pending(dma_chan); |
| async_tx_ack(tx); |
| msleep(1); |
| |
| if (mv_xor_status(dma_chan, cookie, NULL) != |
| DMA_COMPLETE) { |
| dev_err(dma_chan->device->dev, |
| "Self-test copy timed out, disabling\n"); |
| err = -ENODEV; |
| goto free_resources; |
| } |
| |
| dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma, |
| PAGE_SIZE, DMA_FROM_DEVICE); |
| if (memcmp(src, dest, PAGE_SIZE)) { |
| dev_err(dma_chan->device->dev, |
| "Self-test copy failed compare, disabling\n"); |
| err = -ENODEV; |
| goto free_resources; |
| } |
| |
| free_resources: |
| dmaengine_unmap_put(unmap); |
| mv_xor_free_chan_resources(dma_chan); |
| out: |
| kfree(src); |
| kfree(dest); |
| return err; |
| } |
| |
| #define MV_XOR_NUM_SRC_TEST 4 /* must be <= 15 */ |
| static int |
| mv_xor_xor_self_test(struct mv_xor_chan *mv_chan) |
| { |
| int i, src_idx, ret; |
| struct page *dest; |
| struct page *xor_srcs[MV_XOR_NUM_SRC_TEST]; |
| dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST]; |
| dma_addr_t dest_dma; |
| struct dma_async_tx_descriptor *tx; |
| struct dmaengine_unmap_data *unmap; |
| struct dma_chan *dma_chan; |
| dma_cookie_t cookie; |
| u8 cmp_byte = 0; |
| u32 cmp_word; |
| int err = 0; |
| int src_count = MV_XOR_NUM_SRC_TEST; |
| |
| for (src_idx = 0; src_idx < src_count; src_idx++) { |
| xor_srcs[src_idx] = alloc_page(GFP_KERNEL); |
| if (!xor_srcs[src_idx]) { |
| while (src_idx--) |
| __free_page(xor_srcs[src_idx]); |
| return -ENOMEM; |
| } |
| } |
| |
| dest = alloc_page(GFP_KERNEL); |
| if (!dest) { |
| while (src_idx--) |
| __free_page(xor_srcs[src_idx]); |
| return -ENOMEM; |
| } |
| |
| /* Fill in src buffers */ |
| for (src_idx = 0; src_idx < src_count; src_idx++) { |
| u8 *ptr = page_address(xor_srcs[src_idx]); |
| for (i = 0; i < PAGE_SIZE; i++) |
| ptr[i] = (1 << src_idx); |
| } |
| |
| for (src_idx = 0; src_idx < src_count; src_idx++) |
| cmp_byte ^= (u8) (1 << src_idx); |
| |
| cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | |
| (cmp_byte << 8) | cmp_byte; |
| |
| memset(page_address(dest), 0, PAGE_SIZE); |
| |
| dma_chan = &mv_chan->dmachan; |
| if (mv_xor_alloc_chan_resources(dma_chan) < 1) { |
| err = -ENODEV; |
| goto out; |
| } |
| |
| unmap = dmaengine_get_unmap_data(dma_chan->device->dev, src_count + 1, |
| GFP_KERNEL); |
| if (!unmap) { |
| err = -ENOMEM; |
| goto free_resources; |
| } |
| |
| /* test xor */ |
| for (i = 0; i < src_count; i++) { |
| unmap->addr[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i], |
| 0, PAGE_SIZE, DMA_TO_DEVICE); |
| dma_srcs[i] = unmap->addr[i]; |
| ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[i]); |
| if (ret) { |
| err = -ENOMEM; |
| goto free_resources; |
| } |
| unmap->to_cnt++; |
| } |
| |
| unmap->addr[src_count] = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE, |
| DMA_FROM_DEVICE); |
| dest_dma = unmap->addr[src_count]; |
| ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[src_count]); |
| if (ret) { |
| err = -ENOMEM; |
| goto free_resources; |
| } |
| unmap->from_cnt = 1; |
| unmap->len = PAGE_SIZE; |
| |
| tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs, |
| src_count, PAGE_SIZE, 0); |
| if (!tx) { |
| dev_err(dma_chan->device->dev, |
| "Self-test cannot prepare operation, disabling\n"); |
| err = -ENODEV; |
| goto free_resources; |
| } |
| |
| cookie = mv_xor_tx_submit(tx); |
| if (dma_submit_error(cookie)) { |
| dev_err(dma_chan->device->dev, |
| "Self-test submit error, disabling\n"); |
| err = -ENODEV; |
| goto free_resources; |
| } |
| |
| mv_xor_issue_pending(dma_chan); |
| async_tx_ack(tx); |
| msleep(8); |
| |
| if (mv_xor_status(dma_chan, cookie, NULL) != |
| DMA_COMPLETE) { |
| dev_err(dma_chan->device->dev, |
| "Self-test xor timed out, disabling\n"); |
| err = -ENODEV; |
| goto free_resources; |
| } |
| |
| dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma, |
| PAGE_SIZE, DMA_FROM_DEVICE); |
| for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { |
| u32 *ptr = page_address(dest); |
| if (ptr[i] != cmp_word) { |
| dev_err(dma_chan->device->dev, |
| "Self-test xor failed compare, disabling. index %d, data %x, expected %x\n", |
| i, ptr[i], cmp_word); |
| err = -ENODEV; |
| goto free_resources; |
| } |
| } |
| |
| free_resources: |
| dmaengine_unmap_put(unmap); |
| mv_xor_free_chan_resources(dma_chan); |
| out: |
| src_idx = src_count; |
| while (src_idx--) |
| __free_page(xor_srcs[src_idx]); |
| __free_page(dest); |
| return err; |
| } |
| |
| /* This driver does not implement any of the optional DMA operations. */ |
| static int |
| mv_xor_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
| unsigned long arg) |
| { |
| return -ENOSYS; |
| } |
| |
| static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan) |
| { |
| struct dma_chan *chan, *_chan; |
| struct device *dev = mv_chan->dmadev.dev; |
| |
| dma_async_device_unregister(&mv_chan->dmadev); |
| |
| dma_free_coherent(dev, MV_XOR_POOL_SIZE, |
| mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool); |
| |
| list_for_each_entry_safe(chan, _chan, &mv_chan->dmadev.channels, |
| device_node) { |
| list_del(&chan->device_node); |
| } |
| |
| free_irq(mv_chan->irq, mv_chan); |
| |
| return 0; |
| } |
| |
| static struct mv_xor_chan * |
| mv_xor_channel_add(struct mv_xor_device *xordev, |
| struct platform_device *pdev, |
| int idx, dma_cap_mask_t cap_mask, int irq) |
| { |
| int ret = 0; |
| struct mv_xor_chan *mv_chan; |
| struct dma_device *dma_dev; |
| |
| mv_chan = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL); |
| if (!mv_chan) |
| return ERR_PTR(-ENOMEM); |
| |
| mv_chan->idx = idx; |
| mv_chan->irq = irq; |
| |
| dma_dev = &mv_chan->dmadev; |
| |
| /* allocate coherent memory for hardware descriptors |
| * note: writecombine gives slightly better performance, but |
| * requires that we explicitly flush the writes |
| */ |
| mv_chan->dma_desc_pool_virt = |
| dma_alloc_writecombine(&pdev->dev, MV_XOR_POOL_SIZE, |
| &mv_chan->dma_desc_pool, GFP_KERNEL); |
| if (!mv_chan->dma_desc_pool_virt) |
| return ERR_PTR(-ENOMEM); |
| |
| /* discover transaction capabilites from the platform data */ |
| dma_dev->cap_mask = cap_mask; |
| |
| INIT_LIST_HEAD(&dma_dev->channels); |
| |
| /* set base routines */ |
| dma_dev->device_alloc_chan_resources = mv_xor_alloc_chan_resources; |
| dma_dev->device_free_chan_resources = mv_xor_free_chan_resources; |
| dma_dev->device_tx_status = mv_xor_status; |
| dma_dev->device_issue_pending = mv_xor_issue_pending; |
| dma_dev->device_control = mv_xor_control; |
| dma_dev->dev = &pdev->dev; |
| |
| /* set prep routines based on capability */ |
| if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) |
| dma_dev->device_prep_dma_memcpy = mv_xor_prep_dma_memcpy; |
| if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { |
| dma_dev->max_xor = 8; |
| dma_dev->device_prep_dma_xor = mv_xor_prep_dma_xor; |
| } |
| |
| mv_chan->mmr_base = xordev->xor_base; |
| mv_chan->mmr_high_base = xordev->xor_high_base; |
| tasklet_init(&mv_chan->irq_tasklet, mv_xor_tasklet, (unsigned long) |
| mv_chan); |
| |
| /* clear errors before enabling interrupts */ |
| mv_xor_device_clear_err_status(mv_chan); |
| |
| ret = request_irq(mv_chan->irq, mv_xor_interrupt_handler, |
| 0, dev_name(&pdev->dev), mv_chan); |
| if (ret) |
| goto err_free_dma; |
| |
| mv_chan_unmask_interrupts(mv_chan); |
| |
| mv_set_mode(mv_chan, DMA_MEMCPY); |
| |
| spin_lock_init(&mv_chan->lock); |
| INIT_LIST_HEAD(&mv_chan->chain); |
| INIT_LIST_HEAD(&mv_chan->completed_slots); |
| INIT_LIST_HEAD(&mv_chan->all_slots); |
| mv_chan->dmachan.device = dma_dev; |
| dma_cookie_init(&mv_chan->dmachan); |
| |
| list_add_tail(&mv_chan->dmachan.device_node, &dma_dev->channels); |
| |
| if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { |
| ret = mv_xor_memcpy_self_test(mv_chan); |
| dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); |
| if (ret) |
| goto err_free_irq; |
| } |
| |
| if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { |
| ret = mv_xor_xor_self_test(mv_chan); |
| dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); |
| if (ret) |
| goto err_free_irq; |
| } |
| |
| dev_info(&pdev->dev, "Marvell XOR: ( %s%s%s)\n", |
| dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", |
| dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", |
| dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : ""); |
| |
| dma_async_device_register(dma_dev); |
| return mv_chan; |
| |
| err_free_irq: |
| free_irq(mv_chan->irq, mv_chan); |
| err_free_dma: |
| dma_free_coherent(&pdev->dev, MV_XOR_POOL_SIZE, |
| mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool); |
| return ERR_PTR(ret); |
| } |
| |
| static void |
| mv_xor_conf_mbus_windows(struct mv_xor_device *xordev, |
| const struct mbus_dram_target_info *dram) |
| { |
| void __iomem *base = xordev->xor_high_base; |
| u32 win_enable = 0; |
| int i; |
| |
| for (i = 0; i < 8; i++) { |
| writel(0, base + WINDOW_BASE(i)); |
| writel(0, base + WINDOW_SIZE(i)); |
| if (i < 4) |
| writel(0, base + WINDOW_REMAP_HIGH(i)); |
| } |
| |
| for (i = 0; i < dram->num_cs; i++) { |
| const struct mbus_dram_window *cs = dram->cs + i; |
| |
| writel((cs->base & 0xffff0000) | |
| (cs->mbus_attr << 8) | |
| dram->mbus_dram_target_id, base + WINDOW_BASE(i)); |
| writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i)); |
| |
| win_enable |= (1 << i); |
| win_enable |= 3 << (16 + (2 * i)); |
| } |
| |
| writel(win_enable, base + WINDOW_BAR_ENABLE(0)); |
| writel(win_enable, base + WINDOW_BAR_ENABLE(1)); |
| writel(0, base + WINDOW_OVERRIDE_CTRL(0)); |
| writel(0, base + WINDOW_OVERRIDE_CTRL(1)); |
| } |
| |
| static int mv_xor_probe(struct platform_device *pdev) |
| { |
| const struct mbus_dram_target_info *dram; |
| struct mv_xor_device *xordev; |
| struct mv_xor_platform_data *pdata = dev_get_platdata(&pdev->dev); |
| struct resource *res; |
| int i, ret; |
| |
| dev_notice(&pdev->dev, "Marvell shared XOR driver\n"); |
| |
| xordev = devm_kzalloc(&pdev->dev, sizeof(*xordev), GFP_KERNEL); |
| if (!xordev) |
| return -ENOMEM; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) |
| return -ENODEV; |
| |
| xordev->xor_base = devm_ioremap(&pdev->dev, res->start, |
| resource_size(res)); |
| if (!xordev->xor_base) |
| return -EBUSY; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| if (!res) |
| return -ENODEV; |
| |
| xordev->xor_high_base = devm_ioremap(&pdev->dev, res->start, |
| resource_size(res)); |
| if (!xordev->xor_high_base) |
| return -EBUSY; |
| |
| platform_set_drvdata(pdev, xordev); |
| |
| /* |
| * (Re-)program MBUS remapping windows if we are asked to. |
| */ |
| dram = mv_mbus_dram_info(); |
| if (dram) |
| mv_xor_conf_mbus_windows(xordev, dram); |
| |
| /* Not all platforms can gate the clock, so it is not |
| * an error if the clock does not exists. |
| */ |
| xordev->clk = clk_get(&pdev->dev, NULL); |
| if (!IS_ERR(xordev->clk)) |
| clk_prepare_enable(xordev->clk); |
| |
| if (pdev->dev.of_node) { |
| struct device_node *np; |
| int i = 0; |
| |
| for_each_child_of_node(pdev->dev.of_node, np) { |
| struct mv_xor_chan *chan; |
| dma_cap_mask_t cap_mask; |
| int irq; |
| |
| dma_cap_zero(cap_mask); |
| if (of_property_read_bool(np, "dmacap,memcpy")) |
| dma_cap_set(DMA_MEMCPY, cap_mask); |
| if (of_property_read_bool(np, "dmacap,xor")) |
| dma_cap_set(DMA_XOR, cap_mask); |
| if (of_property_read_bool(np, "dmacap,interrupt")) |
| dma_cap_set(DMA_INTERRUPT, cap_mask); |
| |
| irq = irq_of_parse_and_map(np, 0); |
| if (!irq) { |
| ret = -ENODEV; |
| goto err_channel_add; |
| } |
| |
| chan = mv_xor_channel_add(xordev, pdev, i, |
| cap_mask, irq); |
| if (IS_ERR(chan)) { |
| ret = PTR_ERR(chan); |
| irq_dispose_mapping(irq); |
| goto err_channel_add; |
| } |
| |
| xordev->channels[i] = chan; |
| i++; |
| } |
| } else if (pdata && pdata->channels) { |
| for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) { |
| struct mv_xor_channel_data *cd; |
| struct mv_xor_chan *chan; |
| int irq; |
| |
| cd = &pdata->channels[i]; |
| if (!cd) { |
| ret = -ENODEV; |
| goto err_channel_add; |
| } |
| |
| irq = platform_get_irq(pdev, i); |
| if (irq < 0) { |
| ret = irq; |
| goto err_channel_add; |
| } |
| |
| chan = mv_xor_channel_add(xordev, pdev, i, |
| cd->cap_mask, irq); |
| if (IS_ERR(chan)) { |
| ret = PTR_ERR(chan); |
| goto err_channel_add; |
| } |
| |
| xordev->channels[i] = chan; |
| } |
| } |
| |
| return 0; |
| |
| err_channel_add: |
| for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) |
| if (xordev->channels[i]) { |
| mv_xor_channel_remove(xordev->channels[i]); |
| if (pdev->dev.of_node) |
| irq_dispose_mapping(xordev->channels[i]->irq); |
| } |
| |
| if (!IS_ERR(xordev->clk)) { |
| clk_disable_unprepare(xordev->clk); |
| clk_put(xordev->clk); |
| } |
| |
| return ret; |
| } |
| |
| static int mv_xor_remove(struct platform_device *pdev) |
| { |
| struct mv_xor_device *xordev = platform_get_drvdata(pdev); |
| int i; |
| |
| for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) { |
| if (xordev->channels[i]) |
| mv_xor_channel_remove(xordev->channels[i]); |
| } |
| |
| if (!IS_ERR(xordev->clk)) { |
| clk_disable_unprepare(xordev->clk); |
| clk_put(xordev->clk); |
| } |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_OF |
| static struct of_device_id mv_xor_dt_ids[] = { |
| { .compatible = "marvell,orion-xor", }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, mv_xor_dt_ids); |
| #endif |
| |
| static struct platform_driver mv_xor_driver = { |
| .probe = mv_xor_probe, |
| .remove = mv_xor_remove, |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = MV_XOR_NAME, |
| .of_match_table = of_match_ptr(mv_xor_dt_ids), |
| }, |
| }; |
| |
| |
| static int __init mv_xor_init(void) |
| { |
| return platform_driver_register(&mv_xor_driver); |
| } |
| module_init(mv_xor_init); |
| |
| /* it's currently unsafe to unload this module */ |
| #if 0 |
| static void __exit mv_xor_exit(void) |
| { |
| platform_driver_unregister(&mv_xor_driver); |
| return; |
| } |
| |
| module_exit(mv_xor_exit); |
| #endif |
| |
| MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>"); |
| MODULE_DESCRIPTION("DMA engine driver for Marvell's XOR engine"); |
| MODULE_LICENSE("GPL"); |