diff options
Diffstat (limited to 'drivers/dma/mv_xor.c')
| -rw-r--r-- | drivers/dma/mv_xor.c | 1375 |
1 files changed, 1375 insertions, 0 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c new file mode 100644 index 0000000..a4e4494 --- /dev/null +++ b/drivers/dma/mv_xor.c @@ -0,0 +1,1375 @@ +/* + * 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/async_tx.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 <asm/plat-orion/mv_xor.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, common) + +#define to_mv_xor_device(dev) \ + container_of(dev, struct mv_xor_device, common) + +#define to_mv_xor_slot(tx) \ + container_of(tx, struct mv_xor_desc_slot, async_tx) + +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 u32 mv_desc_get_dest_addr(struct mv_xor_desc_slot *desc) +{ + struct mv_xor_desc *hw_desc = desc->hw_desc; + return hw_desc->phy_dest_addr; +} + +static u32 mv_desc_get_src_addr(struct mv_xor_desc_slot *desc, + int src_idx) +{ + struct mv_xor_desc *hw_desc = desc->hw_desc; + return hw_desc->phy_src_addr[src_idx]; +} + + +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_block_fill_val(struct mv_xor_desc_slot *desc, u32 val) +{ + desc->value = val; +} + +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[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 __raw_readl(XOR_CURR_DESC(chan)); +} + +static void mv_chan_set_next_descriptor(struct mv_xor_chan *chan, + u32 next_desc_addr) +{ + __raw_writel(next_desc_addr, XOR_NEXT_DESC(chan)); +} + +static void mv_chan_set_dest_pointer(struct mv_xor_chan *chan, u32 desc_addr) +{ + __raw_writel(desc_addr, XOR_DEST_POINTER(chan)); +} + +static void mv_chan_set_block_size(struct mv_xor_chan *chan, u32 block_size) +{ + __raw_writel(block_size, XOR_BLOCK_SIZE(chan)); +} + +static void mv_chan_set_value(struct mv_xor_chan *chan, u32 value) +{ + __raw_writel(value, XOR_INIT_VALUE_LOW(chan)); + __raw_writel(value, XOR_INIT_VALUE_HIGH(chan)); +} + +static void mv_chan_unmask_interrupts(struct mv_xor_chan *chan) +{ + u32 val = __raw_readl(XOR_INTR_MASK(chan)); + val |= XOR_INTR_MASK_VALUE << (chan->idx * 16); + __raw_writel(val, XOR_INTR_MASK(chan)); +} + +static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan) +{ + u32 intr_cause = __raw_readl(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 << (1 + (chan->idx * 16))); + dev_dbg(chan->device->common.dev, "%s, val 0x%08x\n", __func__, val); + __raw_writel(val, XOR_INTR_CAUSE(chan)); +} + +static void mv_xor_device_clear_err_status(struct mv_xor_chan *chan) +{ + u32 val = 0xFFFF0000 >> (chan->idx * 16); + __raw_writel(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; + if (desc->type == DMA_MEMSET) + return 0; + + return 1; +} + +static void mv_set_mode(struct mv_xor_chan *chan, + enum dma_transaction_type type) +{ + u32 op_mode; + u32 config = __raw_readl(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; + case DMA_MEMSET: + op_mode = XOR_OPERATION_MODE_MEMSET; + break; + default: + dev_printk(KERN_ERR, chan->device->common.dev, + "error: unsupported operation %d.\n", + type); + BUG(); + return; + } + + config &= ~0x7; + config |= op_mode; + __raw_writel(config, XOR_CONFIG(chan)); + chan->current_type = type; +} + +static void mv_chan_activate(struct mv_xor_chan *chan) +{ + u32 activation; + + dev_dbg(chan->device->common.dev, " activate chan.\n"); + activation = __raw_readl(XOR_ACTIVATION(chan)); + activation |= 0x1; + __raw_writel(activation, XOR_ACTIVATION(chan)); +} + +static char mv_chan_is_busy(struct mv_xor_chan *chan) +{ + u32 state = __raw_readl(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->device->common.dev, "%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->device->common.dev, "%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); + + if (sw_desc->type == DMA_MEMSET) { + /* for memset requests we need to program the engine, no + * descriptors used. + */ + struct mv_xor_desc *hw_desc = sw_desc->hw_desc; + mv_chan_set_dest_pointer(mv_chan, hw_desc->phy_dest_addr); + mv_chan_set_block_size(mv_chan, sw_desc->unmap_len); + mv_chan_set_value(mv_chan, sw_desc->value); + } else { + /* 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->common); +} + +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); + + /* unmap dma addresses + * (unmap_single vs unmap_page?) + */ + if (desc->group_head && desc->unmap_len) { + struct mv_xor_desc_slot *unmap = desc->group_head; + struct device *dev = + &mv_chan->device->pdev->dev; + u32 len = unmap->unmap_len; + enum dma_ctrl_flags flags = desc->async_tx.flags; + u32 src_cnt; + dma_addr_t addr; + + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) { + addr = mv_desc_get_dest_addr(unmap); + dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE); + } + + if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + src_cnt = unmap->unmap_src_cnt; + while (src_cnt--) { + addr = mv_desc_get_src_addr(unmap, + src_cnt); + dma_unmap_page(dev, addr, len, + DMA_TO_DEVICE); + } + } + desc->group_head = NULL; + } + } + + /* run dependent operations */ + async_tx_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->device->common.dev, "%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->device->common.dev, "%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; +} + +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->device->common.dev, "%s %d\n", __func__, __LINE__); + dev_dbg(mv_chan->device->common.dev, "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->completed_cookie = cookie; +} + +static void +mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan) +{ + spin_lock_bh(&mv_chan->lock); + __mv_xor_slot_cleanup(mv_chan); + spin_unlock_bh(&mv_chan->lock); +} + +static void mv_xor_tasklet(unsigned long data) +{ + struct mv_xor_chan *chan = (struct mv_xor_chan *) data; + __mv_xor_slot_cleanup(chan); +} + +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->async_tx.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; +} + +static dma_cookie_t +mv_desc_assign_cookie(struct mv_xor_chan *mv_chan, + struct mv_xor_desc_slot *desc) +{ + dma_cookie_t cookie = mv_chan->common.cookie; + + if (++cookie < 0) + cookie = 1; + mv_chan->common.cookie = desc->async_tx.cookie = cookie; + return cookie; +} + +/************************ 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->device->common.dev, + "%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 = mv_desc_assign_cookie(mv_chan, sw_desc); + + if (list_empty(&mv_chan->chain)) + list_splice_init(&sw_desc->async_tx.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->async_tx.tx_list, + &old_chain_tail->chain_node); + + if (!mv_can_chain(grp_start)) + goto submit_done; + + dev_dbg(mv_chan->device->common.dev, "Append to last desc %x\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, + struct dma_client *client) +{ + char *hw_desc; + int idx; + struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); + struct mv_xor_desc_slot *slot = NULL; + struct mv_xor_platform_data *plat_data = + mv_chan->device->pdev->dev.platform_data; + int num_descs_in_pool = plat_data->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; + } + hw_desc = (char *) mv_chan->device->dma_desc_pool_virt; + slot->hw_desc = (void *) &hw_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->async_tx.tx_list); + hw_desc = (char *) mv_chan->device->dma_desc_pool; + slot->async_tx.phys = + (dma_addr_t) &hw_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->device->common.dev, + "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->device->common.dev, + "%s dest: %x src %x len: %u flags: %ld\n", + __func__, dest, src, len, flags); + if (unlikely(len < MV_XOR_MIN_BYTE_COUNT)) + return NULL; + + BUG_ON(unlikely(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->device->common.dev, + "%s sw_desc %p async_tx %p\n", + __func__, sw_desc, sw_desc ? &sw_desc->async_tx : 0); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static struct dma_async_tx_descriptor * +mv_xor_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value, + 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->device->common.dev, + "%s dest: %x len: %u flags: %ld\n", + __func__, dest, len, flags); + if (unlikely(len < MV_XOR_MIN_BYTE_COUNT)) + return NULL; + + BUG_ON(unlikely(len > MV_XOR_MAX_BYTE_COUNT)); + + spin_lock_bh(&mv_chan->lock); + slot_cnt = mv_chan_memset_slot_count(len); + sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1); + if (sw_desc) { + sw_desc->type = DMA_MEMSET; + 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_block_fill_val(grp_start, value); + sw_desc->unmap_src_cnt = 1; + sw_desc->unmap_len = len; + } + spin_unlock_bh(&mv_chan->lock); + dev_dbg(mv_chan->device->common.dev, + "%s sw_desc %p async_tx %p \n", + __func__, sw_desc, &sw_desc->async_tx); + 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(unlikely(len > MV_XOR_MAX_BYTE_COUNT)); + + dev_dbg(mv_chan->device->common.dev, + "%s src_cnt: %d len: dest %x %u 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->device->common.dev, + "%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; + + mv_xor_slot_cleanup(mv_chan); + + spin_lock_bh(&mv_chan->lock); + 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->device->common.dev, "%s slots_allocated %d\n", + __func__, mv_chan->slots_allocated); + spin_unlock_bh(&mv_chan->lock); + + if (in_use_descs) + dev_err(mv_chan->device->common.dev, + "freeing %d in use descriptors!\n", in_use_descs); +} + +/** + * mv_xor_is_complete - poll the status of an XOR transaction + * @chan: XOR channel handle + * @cookie: XOR transaction identifier + */ +static enum dma_status mv_xor_is_complete(struct dma_chan *chan, + dma_cookie_t cookie, + dma_cookie_t *done, + dma_cookie_t *used) +{ + struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); + dma_cookie_t last_used; + dma_cookie_t last_complete; + enum dma_status ret; + + last_used = chan->cookie; + last_complete = mv_chan->completed_cookie; + mv_chan->is_complete_cookie = cookie; + if (done) + *done = last_complete; + if (used) + *used = last_used; + + ret = dma_async_is_complete(cookie, last_complete, last_used); + if (ret == DMA_SUCCESS) { + mv_xor_clean_completed_slots(mv_chan); + return ret; + } + mv_xor_slot_cleanup(mv_chan); + + last_used = chan->cookie; + last_complete = mv_chan->completed_cookie; + + if (done) + *done = last_complete; + if (used) + *used = last_used; + + return dma_async_is_complete(cookie, last_complete, last_used); +} + +static void mv_dump_xor_regs(struct mv_xor_chan *chan) +{ + u32 val; + + val = __raw_readl(XOR_CONFIG(chan)); + dev_printk(KERN_ERR, chan->device->common.dev, + "config 0x%08x.\n", val); + + val = __raw_readl(XOR_ACTIVATION(chan)); + dev_printk(KERN_ERR, chan->device->common.dev, + "activation 0x%08x.\n", val); + + val = __raw_readl(XOR_INTR_CAUSE(chan)); + dev_printk(KERN_ERR, chan->device->common.dev, + "intr cause 0x%08x.\n", val); + + val = __raw_readl(XOR_INTR_MASK(chan)); + dev_printk(KERN_ERR, chan->device->common.dev, + "intr mask 0x%08x.\n", val); + + val = __raw_readl(XOR_ERROR_CAUSE(chan)); + dev_printk(KERN_ERR, chan->device->common.dev, + "error cause 0x%08x.\n", val); + + val = __raw_readl(XOR_ERROR_ADDR(chan)); + dev_printk(KERN_ERR, chan->device->common.dev, + "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(chan->device->common.dev, + "ignore this error\n"); + return; + } + + dev_printk(KERN_ERR, chan->device->common.dev, + "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(chan->device->common.dev, "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. + */ +#define MV_XOR_TEST_SIZE 2000 + +static int __devinit mv_xor_memcpy_self_test(struct mv_xor_device *device) +{ + int i; + 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; + int err = 0; + struct mv_xor_chan *mv_chan; + + src = kmalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL); + if (!src) + return -ENOMEM; + + dest = kzalloc(sizeof(u8) * MV_XOR_TEST_SIZE, GFP_KERNEL); + if (!dest) { + kfree(src); + return -ENOMEM; + } + + /* Fill in src buffer */ + for (i = 0; i < MV_XOR_TEST_SIZE; i++) + ((u8 *) src)[i] = (u8)i; + + /* Start copy, using first DMA channel */ + dma_chan = container_of(device->common.channels.next, + struct dma_chan, + device_node); + if (mv_xor_alloc_chan_resources(dma_chan, NULL) < 1) { + err = -ENODEV; + goto out; + } + + dest_dma = dma_map_single(dma_chan->device->dev, dest, + MV_XOR_TEST_SIZE, DMA_FROM_DEVICE); + + src_dma = dma_map_single(dma_chan->device->dev, src, + MV_XOR_TEST_SIZE, DMA_TO_DEVICE); + + tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma, + MV_XOR_TEST_SIZE, 0); + cookie = mv_xor_tx_submit(tx); + mv_xor_issue_pending(dma_chan); + async_tx_ack(tx); + msleep(1); + + if (mv_xor_is_complete(dma_chan, cookie, NULL, NULL) != + DMA_SUCCESS) { + dev_printk(KERN_ERR, dma_chan->device->dev, + "Self-test copy timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + mv_chan = to_mv_xor_chan(dma_chan); + dma_sync_single_for_cpu(&mv_chan->device->pdev->dev, dest_dma, + MV_XOR_TEST_SIZE, DMA_FROM_DEVICE); + if (memcmp(src, dest, MV_XOR_TEST_SIZE)) { + dev_printk(KERN_ERR, dma_chan->device->dev, + "Self-test copy failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + +free_resources: + 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 __devinit +mv_xor_xor_self_test(struct mv_xor_device *device) +{ + int i, src_idx; + 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 dma_chan *dma_chan; + dma_cookie_t cookie; + u8 cmp_byte = 0; + u32 cmp_word; + int err = 0; + struct mv_xor_chan *mv_chan; + + for (src_idx = 0; src_idx < MV_XOR_NUM_SRC_TEST; 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 < MV_XOR_NUM_SRC_TEST; 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 < MV_XOR_NUM_SRC_TEST; 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 = container_of(device->common.channels.next, + struct dma_chan, + device_node); + if (mv_xor_alloc_chan_resources(dma_chan, NULL) < 1) { + err = -ENODEV; + goto out; + } + + /* test xor */ + dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE, + DMA_FROM_DEVICE); + + for (i = 0; i < MV_XOR_NUM_SRC_TEST; i++) + dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i], + 0, PAGE_SIZE, DMA_TO_DEVICE); + + tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs, + MV_XOR_NUM_SRC_TEST, PAGE_SIZE, 0); + + cookie = mv_xor_tx_submit(tx); + mv_xor_issue_pending(dma_chan); + async_tx_ack(tx); + msleep(8); + + if (mv_xor_is_complete(dma_chan, cookie, NULL, NULL) != + DMA_SUCCESS) { + dev_printk(KERN_ERR, dma_chan->device->dev, + "Self-test xor timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + mv_chan = to_mv_xor_chan(dma_chan); + dma_sync_single_for_cpu(&mv_chan->device->pdev->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_printk(KERN_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: + mv_xor_free_chan_resources(dma_chan); +out: + src_idx = MV_XOR_NUM_SRC_TEST; + while (src_idx--) + __free_page(xor_srcs[src_idx]); + __free_page(dest); + return err; +} + +static int __devexit mv_xor_remove(struct platform_device *dev) +{ + struct mv_xor_device *device = platform_get_drvdata(dev); + struct dma_chan *chan, *_chan; + struct mv_xor_chan *mv_chan; + struct mv_xor_platform_data *plat_data = dev->dev.platform_data; + + dma_async_device_unregister(&device->common); + + dma_free_coherent(&dev->dev, plat_data->pool_size, + device->dma_desc_pool_virt, device->dma_desc_pool); + + list_for_each_entry_safe(chan, _chan, &device->common.channels, + device_node) { + mv_chan = to_mv_xor_chan(chan); + list_del(&chan->device_node); + } + + return 0; +} + +static int __devinit mv_xor_probe(struct platform_device *pdev) +{ + int ret = 0; + int irq; + struct mv_xor_device *adev; + struct mv_xor_chan *mv_chan; + struct dma_device *dma_dev; + struct mv_xor_platform_data *plat_data = pdev->dev.platform_data; + + + adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL); + if (!adev) + return -ENOMEM; + + dma_dev = &adev->common; + + /* allocate coherent memory for hardware descriptors + * note: writecombine gives slightly better performance, but + * requires that we explicitly flush the writes + */ + adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev, + plat_data->pool_size, + &adev->dma_desc_pool, + GFP_KERNEL); + if (!adev->dma_desc_pool_virt) + return -ENOMEM; + + adev->id = plat_data->hw_id; + + /* discover transaction capabilites from the platform data */ + dma_dev->cap_mask = plat_data->cap_mask; + adev->pdev = pdev; + platform_set_drvdata(pdev, adev); + + adev->shared = platform_get_drvdata(plat_data->shared); + + 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_is_tx_complete = mv_xor_is_complete; + dma_dev->device_issue_pending = mv_xor_issue_pending; + 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_MEMSET, dma_dev->cap_mask)) + dma_dev->device_prep_dma_memset = mv_xor_prep_dma_memset; + 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 = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL); + if (!mv_chan) { + ret = -ENOMEM; + goto err_free_dma; + } + mv_chan->device = adev; + mv_chan->idx = plat_data->hw_id; + mv_chan->mmr_base = adev->shared->xor_base; + + if (!mv_chan->mmr_base) { + ret = -ENOMEM; + goto err_free_dma; + } + 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); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto err_free_dma; + } + ret = devm_request_irq(&pdev->dev, 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); + INIT_RCU_HEAD(&mv_chan->common.rcu); + mv_chan->common.device = dma_dev; + + list_add_tail(&mv_chan->common.device_node, &dma_dev->channels); + + if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { + ret = mv_xor_memcpy_self_test(adev); + dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); + if (ret) + goto err_free_dma; + } + + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { + ret = mv_xor_xor_self_test(adev); + dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); + if (ret) + goto err_free_dma; + } + + dev_printk(KERN_INFO, &pdev->dev, "Marvell XOR: " + "( %s%s%s%s)\n", + dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", + dma_has_cap(DMA_MEMSET, dma_dev->cap_mask) ? "fill " : "", + 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); + goto out; + + err_free_dma: + dma_free_coherent(&adev->pdev->dev, plat_data->pool_size, + adev->dma_desc_pool_virt, adev->dma_desc_pool); + out: + return ret; +} + +static void +mv_xor_conf_mbus_windows(struct mv_xor_shared_private *msp, + struct mbus_dram_target_info *dram) +{ + void __iomem *base = msp->xor_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++) { + 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)); +} + +static struct platform_driver mv_xor_driver = { + .probe = mv_xor_probe, + .remove = mv_xor_remove, + .driver = { + .owner = THIS_MODULE, + .name = MV_XOR_NAME, + }, +}; + +static int mv_xor_shared_probe(struct platform_device *pdev) +{ + struct mv_xor_platform_shared_data *msd = pdev->dev.platform_data; + struct mv_xor_shared_private *msp; + struct resource *res; + + dev_printk(KERN_NOTICE, &pdev->dev, "Marvell shared XOR driver\n"); + + msp = devm_kzalloc(&pdev->dev, sizeof(*msp), GFP_KERNEL); + if (!msp) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + msp->xor_base = devm_ioremap(&pdev->dev, res->start, + res->end - res->start + 1); + if (!msp->xor_base) + return -EBUSY; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) + return -ENODEV; + + msp->xor_high_base = devm_ioremap(&pdev->dev, res->start, + res->end - res->start + 1); + if (!msp->xor_high_base) + return -EBUSY; + + platform_set_drvdata(pdev, msp); + + /* + * (Re-)program MBUS remapping windows if we are asked to. + */ + if (msd != NULL && msd->dram != NULL) + mv_xor_conf_mbus_windows(msp, msd->dram); + + return 0; +} + +static int mv_xor_shared_remove(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver mv_xor_shared_driver = { + .probe = mv_xor_shared_probe, + .remove = mv_xor_shared_remove, + .driver = { + .owner = THIS_MODULE, + .name = MV_XOR_SHARED_NAME, + }, +}; + + +static int __init mv_xor_init(void) +{ + int rc; + + rc = platform_driver_register(&mv_xor_shared_driver); + if (!rc) { + rc = platform_driver_register(&mv_xor_driver); + if (rc) + platform_driver_unregister(&mv_xor_shared_driver); + } + return rc; +} +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); + platform_driver_unregister(&mv_xor_shared_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"); |
