diff options
Diffstat (limited to 'drivers/dma/fsldma.c')
| -rw-r--r-- | drivers/dma/fsldma.c | 1068 |
1 files changed, 1068 insertions, 0 deletions
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c new file mode 100644 index 00000000000..902e852571a --- /dev/null +++ b/drivers/dma/fsldma.c @@ -0,0 +1,1068 @@ +/* + * Freescale MPC85xx, MPC83xx DMA Engine support + * + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. + * + * Author: + * Zhang Wei <wei.zhang@freescale.com>, Jul 2007 + * Ebony Zhu <ebony.zhu@freescale.com>, May 2007 + * + * Description: + * DMA engine driver for Freescale MPC8540 DMA controller, which is + * also fit for MPC8560, MPC8555, MPC8548, MPC8641, and etc. + * The support for MPC8349 DMA contorller is also added. + * + * This 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. + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/of_platform.h> + +#include "fsldma.h" + +static void dma_init(struct fsl_dma_chan *fsl_chan) +{ + /* Reset the channel */ + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, 0, 32); + + switch (fsl_chan->feature & FSL_DMA_IP_MASK) { + case FSL_DMA_IP_85XX: + /* Set the channel to below modes: + * EIE - Error interrupt enable + * EOSIE - End of segments interrupt enable (basic mode) + * EOLNIE - End of links interrupt enable + */ + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, FSL_DMA_MR_EIE + | FSL_DMA_MR_EOLNIE | FSL_DMA_MR_EOSIE, 32); + break; + case FSL_DMA_IP_83XX: + /* Set the channel to below modes: + * EOTIE - End-of-transfer interrupt enable + */ + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, FSL_DMA_MR_EOTIE, + 32); + break; + } + +} + +static void set_sr(struct fsl_dma_chan *fsl_chan, dma_addr_t val) +{ + DMA_OUT(fsl_chan, &fsl_chan->reg_base->sr, val, 32); +} + +static dma_addr_t get_sr(struct fsl_dma_chan *fsl_chan) +{ + return DMA_IN(fsl_chan, &fsl_chan->reg_base->sr, 32); +} + +static void set_desc_cnt(struct fsl_dma_chan *fsl_chan, + struct fsl_dma_ld_hw *hw, u32 count) +{ + hw->count = CPU_TO_DMA(fsl_chan, count, 32); +} + +static void set_desc_src(struct fsl_dma_chan *fsl_chan, + struct fsl_dma_ld_hw *hw, dma_addr_t src) +{ + u64 snoop_bits; + + snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) + ? ((u64)FSL_DMA_SATR_SREADTYPE_SNOOP_READ << 32) : 0; + hw->src_addr = CPU_TO_DMA(fsl_chan, snoop_bits | src, 64); +} + +static void set_desc_dest(struct fsl_dma_chan *fsl_chan, + struct fsl_dma_ld_hw *hw, dma_addr_t dest) +{ + u64 snoop_bits; + + snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) + ? ((u64)FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE << 32) : 0; + hw->dst_addr = CPU_TO_DMA(fsl_chan, snoop_bits | dest, 64); +} + +static void set_desc_next(struct fsl_dma_chan *fsl_chan, + struct fsl_dma_ld_hw *hw, dma_addr_t next) +{ + u64 snoop_bits; + + snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX) + ? FSL_DMA_SNEN : 0; + hw->next_ln_addr = CPU_TO_DMA(fsl_chan, snoop_bits | next, 64); +} + +static void set_cdar(struct fsl_dma_chan *fsl_chan, dma_addr_t addr) +{ + DMA_OUT(fsl_chan, &fsl_chan->reg_base->cdar, addr | FSL_DMA_SNEN, 64); +} + +static dma_addr_t get_cdar(struct fsl_dma_chan *fsl_chan) +{ + return DMA_IN(fsl_chan, &fsl_chan->reg_base->cdar, 64) & ~FSL_DMA_SNEN; +} + +static void set_ndar(struct fsl_dma_chan *fsl_chan, dma_addr_t addr) +{ + DMA_OUT(fsl_chan, &fsl_chan->reg_base->ndar, addr, 64); +} + +static dma_addr_t get_ndar(struct fsl_dma_chan *fsl_chan) +{ + return DMA_IN(fsl_chan, &fsl_chan->reg_base->ndar, 64); +} + +static int dma_is_idle(struct fsl_dma_chan *fsl_chan) +{ + u32 sr = get_sr(fsl_chan); + return (!(sr & FSL_DMA_SR_CB)) || (sr & FSL_DMA_SR_CH); +} + +static void dma_start(struct fsl_dma_chan *fsl_chan) +{ + u32 mr_set = 0;; + + if (fsl_chan->feature & FSL_DMA_CHAN_PAUSE_EXT) { + DMA_OUT(fsl_chan, &fsl_chan->reg_base->bcr, 0, 32); + mr_set |= FSL_DMA_MR_EMP_EN; + } else + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) + & ~FSL_DMA_MR_EMP_EN, 32); + + if (fsl_chan->feature & FSL_DMA_CHAN_START_EXT) + mr_set |= FSL_DMA_MR_EMS_EN; + else + mr_set |= FSL_DMA_MR_CS; + + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) + | mr_set, 32); +} + +static void dma_halt(struct fsl_dma_chan *fsl_chan) +{ + int i = 0; + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | FSL_DMA_MR_CA, + 32); + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & ~(FSL_DMA_MR_CS + | FSL_DMA_MR_EMS_EN | FSL_DMA_MR_CA), 32); + + while (!dma_is_idle(fsl_chan) && (i++ < 100)) + udelay(10); + if (i >= 100 && !dma_is_idle(fsl_chan)) + dev_err(fsl_chan->dev, "DMA halt timeout!\n"); +} + +static void set_ld_eol(struct fsl_dma_chan *fsl_chan, + struct fsl_desc_sw *desc) +{ + desc->hw.next_ln_addr = CPU_TO_DMA(fsl_chan, + DMA_TO_CPU(fsl_chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL, + 64); +} + +static void append_ld_queue(struct fsl_dma_chan *fsl_chan, + struct fsl_desc_sw *new_desc) +{ + struct fsl_desc_sw *queue_tail = to_fsl_desc(fsl_chan->ld_queue.prev); + + if (list_empty(&fsl_chan->ld_queue)) + return; + + /* Link to the new descriptor physical address and + * Enable End-of-segment interrupt for + * the last link descriptor. + * (the previous node's next link descriptor) + * + * For FSL_DMA_IP_83xx, the snoop enable bit need be set. + */ + queue_tail->hw.next_ln_addr = CPU_TO_DMA(fsl_chan, + new_desc->async_tx.phys | FSL_DMA_EOSIE | + (((fsl_chan->feature & FSL_DMA_IP_MASK) + == FSL_DMA_IP_83XX) ? FSL_DMA_SNEN : 0), 64); +} + +/** + * fsl_chan_set_src_loop_size - Set source address hold transfer size + * @fsl_chan : Freescale DMA channel + * @size : Address loop size, 0 for disable loop + * + * The set source address hold transfer size. The source + * address hold or loop transfer size is when the DMA transfer + * data from source address (SA), if the loop size is 4, the DMA will + * read data from SA, SA + 1, SA + 2, SA + 3, then loop back to SA, + * SA + 1 ... and so on. + */ +static void fsl_chan_set_src_loop_size(struct fsl_dma_chan *fsl_chan, int size) +{ + switch (size) { + case 0: + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & + (~FSL_DMA_MR_SAHE), 32); + break; + case 1: + case 2: + case 4: + case 8: + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | + FSL_DMA_MR_SAHE | (__ilog2(size) << 14), + 32); + break; + } +} + +/** + * fsl_chan_set_dest_loop_size - Set destination address hold transfer size + * @fsl_chan : Freescale DMA channel + * @size : Address loop size, 0 for disable loop + * + * The set destination address hold transfer size. The destination + * address hold or loop transfer size is when the DMA transfer + * data to destination address (TA), if the loop size is 4, the DMA will + * write data to TA, TA + 1, TA + 2, TA + 3, then loop back to TA, + * TA + 1 ... and so on. + */ +static void fsl_chan_set_dest_loop_size(struct fsl_dma_chan *fsl_chan, int size) +{ + switch (size) { + case 0: + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & + (~FSL_DMA_MR_DAHE), 32); + break; + case 1: + case 2: + case 4: + case 8: + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | + FSL_DMA_MR_DAHE | (__ilog2(size) << 16), + 32); + break; + } +} + +/** + * fsl_chan_toggle_ext_pause - Toggle channel external pause status + * @fsl_chan : Freescale DMA channel + * @size : Pause control size, 0 for disable external pause control. + * The maximum is 1024. + * + * The Freescale DMA channel can be controlled by the external + * signal DREQ#. The pause control size is how many bytes are allowed + * to transfer before pausing the channel, after which a new assertion + * of DREQ# resumes channel operation. + */ +static void fsl_chan_toggle_ext_pause(struct fsl_dma_chan *fsl_chan, int size) +{ + if (size > 1024) + return; + + if (size) { + DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, + DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) + | ((__ilog2(size) << 24) & 0x0f000000), + 32); + fsl_chan->feature |= FSL_DMA_CHAN_PAUSE_EXT; + } else + fsl_chan->feature &= ~FSL_DMA_CHAN_PAUSE_EXT; +} + +/** + * fsl_chan_toggle_ext_start - Toggle channel external start status + * @fsl_chan : Freescale DMA channel + * @enable : 0 is disabled, 1 is enabled. + * + * If enable the external start, the channel can be started by an + * external DMA start pin. So the dma_start() does not start the + * transfer immediately. The DMA channel will wait for the + * control pin asserted. + */ +static void fsl_chan_toggle_ext_start(struct fsl_dma_chan *fsl_chan, int enable) +{ + if (enable) + fsl_chan->feature |= FSL_DMA_CHAN_START_EXT; + else + fsl_chan->feature &= ~FSL_DMA_CHAN_START_EXT; +} + +static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct fsl_desc_sw *desc = tx_to_fsl_desc(tx); + struct fsl_dma_chan *fsl_chan = to_fsl_chan(tx->chan); + unsigned long flags; + dma_cookie_t cookie; + + /* cookie increment and adding to ld_queue must be atomic */ + spin_lock_irqsave(&fsl_chan->desc_lock, flags); + + cookie = fsl_chan->common.cookie; + cookie++; + if (cookie < 0) + cookie = 1; + desc->async_tx.cookie = cookie; + fsl_chan->common.cookie = desc->async_tx.cookie; + + append_ld_queue(fsl_chan, desc); + list_splice_init(&desc->async_tx.tx_list, fsl_chan->ld_queue.prev); + + spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); + + return cookie; +} + +/** + * fsl_dma_alloc_descriptor - Allocate descriptor from channel's DMA pool. + * @fsl_chan : Freescale DMA channel + * + * Return - The descriptor allocated. NULL for failed. + */ +static struct fsl_desc_sw *fsl_dma_alloc_descriptor( + struct fsl_dma_chan *fsl_chan) +{ + dma_addr_t pdesc; + struct fsl_desc_sw *desc_sw; + + desc_sw = dma_pool_alloc(fsl_chan->desc_pool, GFP_ATOMIC, &pdesc); + if (desc_sw) { + memset(desc_sw, 0, sizeof(struct fsl_desc_sw)); + dma_async_tx_descriptor_init(&desc_sw->async_tx, + &fsl_chan->common); + desc_sw->async_tx.tx_submit = fsl_dma_tx_submit; + INIT_LIST_HEAD(&desc_sw->async_tx.tx_list); + desc_sw->async_tx.phys = pdesc; + } + + return desc_sw; +} + + +/** + * fsl_dma_alloc_chan_resources - Allocate resources for DMA channel. + * @fsl_chan : Freescale DMA channel + * + * This function will create a dma pool for descriptor allocation. + * + * Return - The number of descriptors allocated. + */ +static int fsl_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); + LIST_HEAD(tmp_list); + + /* We need the descriptor to be aligned to 32bytes + * for meeting FSL DMA specification requirement. + */ + fsl_chan->desc_pool = dma_pool_create("fsl_dma_engine_desc_pool", + fsl_chan->dev, sizeof(struct fsl_desc_sw), + 32, 0); + if (!fsl_chan->desc_pool) { + dev_err(fsl_chan->dev, "No memory for channel %d " + "descriptor dma pool.\n", fsl_chan->id); + return 0; + } + + return 1; +} + +/** + * fsl_dma_free_chan_resources - Free all resources of the channel. + * @fsl_chan : Freescale DMA channel + */ +static void fsl_dma_free_chan_resources(struct dma_chan *chan) +{ + struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); + struct fsl_desc_sw *desc, *_desc; + unsigned long flags; + + dev_dbg(fsl_chan->dev, "Free all channel resources.\n"); + spin_lock_irqsave(&fsl_chan->desc_lock, flags); + list_for_each_entry_safe(desc, _desc, &fsl_chan->ld_queue, node) { +#ifdef FSL_DMA_LD_DEBUG + dev_dbg(fsl_chan->dev, + "LD %p will be released.\n", desc); +#endif + list_del(&desc->node); + /* free link descriptor */ + dma_pool_free(fsl_chan->desc_pool, desc, desc->async_tx.phys); + } + spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); + dma_pool_destroy(fsl_chan->desc_pool); +} + +static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy( + struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, + size_t len, unsigned long flags) +{ + struct fsl_dma_chan *fsl_chan; + struct fsl_desc_sw *first = NULL, *prev = NULL, *new; + size_t copy; + LIST_HEAD(link_chain); + + if (!chan) + return NULL; + + if (!len) + return NULL; + + fsl_chan = to_fsl_chan(chan); + + do { + + /* Allocate the link descriptor from DMA pool */ + new = fsl_dma_alloc_descriptor(fsl_chan); + if (!new) { + dev_err(fsl_chan->dev, + "No free memory for link descriptor\n"); + return NULL; + } +#ifdef FSL_DMA_LD_DEBUG + dev_dbg(fsl_chan->dev, "new link desc alloc %p\n", new); +#endif + + copy = min(len, FSL_DMA_BCR_MAX_CNT); + + set_desc_cnt(fsl_chan, &new->hw, copy); + set_desc_src(fsl_chan, &new->hw, dma_src); + set_desc_dest(fsl_chan, &new->hw, dma_dest); + + if (!first) + first = new; + else + set_desc_next(fsl_chan, &prev->hw, new->async_tx.phys); + + new->async_tx.cookie = 0; + new->async_tx.ack = 1; + + prev = new; + len -= copy; + dma_src += copy; + dma_dest += copy; + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->async_tx.tx_list); + } while (len); + + new->async_tx.ack = 0; /* client is in control of this ack */ + new->async_tx.cookie = -EBUSY; + + /* Set End-of-link to the last link descriptor of new list*/ + set_ld_eol(fsl_chan, new); + + return first ? &first->async_tx : NULL; +} + +/** + * fsl_dma_update_completed_cookie - Update the completed cookie. + * @fsl_chan : Freescale DMA channel + */ +static void fsl_dma_update_completed_cookie(struct fsl_dma_chan *fsl_chan) +{ + struct fsl_desc_sw *cur_desc, *desc; + dma_addr_t ld_phy; + + ld_phy = get_cdar(fsl_chan) & FSL_DMA_NLDA_MASK; + + if (ld_phy) { + cur_desc = NULL; + list_for_each_entry(desc, &fsl_chan->ld_queue, node) + if (desc->async_tx.phys == ld_phy) { + cur_desc = desc; + break; + } + + if (cur_desc && cur_desc->async_tx.cookie) { + if (dma_is_idle(fsl_chan)) + fsl_chan->completed_cookie = + cur_desc->async_tx.cookie; + else + fsl_chan->completed_cookie = + cur_desc->async_tx.cookie - 1; + } + } +} + +/** + * fsl_chan_ld_cleanup - Clean up link descriptors + * @fsl_chan : Freescale DMA channel + * + * This function clean up the ld_queue of DMA channel. + * If 'in_intr' is set, the function will move the link descriptor to + * the recycle list. Otherwise, free it directly. + */ +static void fsl_chan_ld_cleanup(struct fsl_dma_chan *fsl_chan) +{ + struct fsl_desc_sw *desc, *_desc; + unsigned long flags; + + spin_lock_irqsave(&fsl_chan->desc_lock, flags); + + fsl_dma_update_completed_cookie(fsl_chan); + dev_dbg(fsl_chan->dev, "chan completed_cookie = %d\n", + fsl_chan->completed_cookie); + list_for_each_entry_safe(desc, _desc, &fsl_chan->ld_queue, node) { + dma_async_tx_callback callback; + void *callback_param; + + if (dma_async_is_complete(desc->async_tx.cookie, + fsl_chan->completed_cookie, fsl_chan->common.cookie) + == DMA_IN_PROGRESS) + break; + + callback = desc->async_tx.callback; + callback_param = desc->async_tx.callback_param; + + /* Remove from ld_queue list */ + list_del(&desc->node); + + dev_dbg(fsl_chan->dev, "link descriptor %p will be recycle.\n", + desc); + dma_pool_free(fsl_chan->desc_pool, desc, desc->async_tx.phys); + + /* Run the link descriptor callback function */ + if (callback) { + spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); + dev_dbg(fsl_chan->dev, "link descriptor %p callback\n", + desc); + callback(callback_param); + spin_lock_irqsave(&fsl_chan->desc_lock, flags); + } + } + spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); +} + +/** + * fsl_chan_xfer_ld_queue - Transfer link descriptors in channel ld_queue. + * @fsl_chan : Freescale DMA channel + */ +static void fsl_chan_xfer_ld_queue(struct fsl_dma_chan *fsl_chan) +{ + struct list_head *ld_node; + dma_addr_t next_dest_addr; + unsigned long flags; + + if (!dma_is_idle(fsl_chan)) + return; + + dma_halt(fsl_chan); + + /* If there are some link descriptors + * not transfered in queue. We need to start it. + */ + spin_lock_irqsave(&fsl_chan->desc_lock, flags); + + /* Find the first un-transfer desciptor */ + for (ld_node = fsl_chan->ld_queue.next; + (ld_node != &fsl_chan->ld_queue) + && (dma_async_is_complete( + to_fsl_desc(ld_node)->async_tx.cookie, + fsl_chan->completed_cookie, + fsl_chan->common.cookie) == DMA_SUCCESS); + ld_node = ld_node->next); + + spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); + + if (ld_node != &fsl_chan->ld_queue) { + /* Get the ld start address from ld_queue */ + next_dest_addr = to_fsl_desc(ld_node)->async_tx.phys; + dev_dbg(fsl_chan->dev, "xfer LDs staring from 0x%016llx\n", + (u64)next_dest_addr); + set_cdar(fsl_chan, next_dest_addr); + dma_start(fsl_chan); + } else { + set_cdar(fsl_chan, 0); + set_ndar(fsl_chan, 0); + } +} + +/** + * fsl_dma_memcpy_issue_pending - Issue the DMA start command + * @fsl_chan : Freescale DMA channel + */ +static void fsl_dma_memcpy_issue_pending(struct dma_chan *chan) +{ + struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); + +#ifdef FSL_DMA_LD_DEBUG + struct fsl_desc_sw *ld; + unsigned long flags; + + spin_lock_irqsave(&fsl_chan->desc_lock, flags); + if (list_empty(&fsl_chan->ld_queue)) { + spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); + return; + } + + dev_dbg(fsl_chan->dev, "--memcpy issue--\n"); + list_for_each_entry(ld, &fsl_chan->ld_queue, node) { + int i; + dev_dbg(fsl_chan->dev, "Ch %d, LD %08x\n", + fsl_chan->id, ld->async_tx.phys); + for (i = 0; i < 8; i++) + dev_dbg(fsl_chan->dev, "LD offset %d: %08x\n", + i, *(((u32 *)&ld->hw) + i)); + } + dev_dbg(fsl_chan->dev, "----------------\n"); + spin_unlock_irqrestore(&fsl_chan->desc_lock, flags); +#endif + + fsl_chan_xfer_ld_queue(fsl_chan); +} + +static void fsl_dma_dependency_added(struct dma_chan *chan) +{ + struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); + + fsl_chan_ld_cleanup(fsl_chan); +} + +/** + * fsl_dma_is_complete - Determine the DMA status + * @fsl_chan : Freescale DMA channel + */ +static enum dma_status fsl_dma_is_complete(struct dma_chan *chan, + dma_cookie_t cookie, + dma_cookie_t *done, + dma_cookie_t *used) +{ + struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan); + dma_cookie_t last_used; + dma_cookie_t last_complete; + + fsl_chan_ld_cleanup(fsl_chan); + + last_used = chan->cookie; + last_complete = fsl_chan->completed_cookie; + + if (done) + *done = last_complete; + + if (used) + *used = last_used; + + return dma_async_is_complete(cookie, last_complete, last_used); +} + +static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data) +{ + struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data; + dma_addr_t stat; + + stat = get_sr(fsl_chan); + dev_dbg(fsl_chan->dev, "event: channel %d, stat = 0x%x\n", + fsl_chan->id, stat); + set_sr(fsl_chan, stat); /* Clear the event register */ + + stat &= ~(FSL_DMA_SR_CB | FSL_DMA_SR_CH); + if (!stat) + return IRQ_NONE; + + if (stat & FSL_DMA_SR_TE) + dev_err(fsl_chan->dev, "Transfer Error!\n"); + + /* If the link descriptor segment transfer finishes, + * we will recycle the used descriptor. + */ + if (stat & FSL_DMA_SR_EOSI) { + dev_dbg(fsl_chan->dev, "event: End-of-segments INT\n"); + dev_dbg(fsl_chan->dev, "event: clndar 0x%016llx, " + "nlndar 0x%016llx\n", (u64)get_cdar(fsl_chan), + (u64)get_ndar(fsl_chan)); + stat &= ~FSL_DMA_SR_EOSI; + fsl_chan_ld_cleanup(fsl_chan); + } + + /* If it current transfer is the end-of-transfer, + * we should clear the Channel Start bit for + * prepare next transfer. + */ + if (stat & (FSL_DMA_SR_EOLNI | FSL_DMA_SR_EOCDI)) { + dev_dbg(fsl_chan->dev, "event: End-of-link INT\n"); + stat &= ~FSL_DMA_SR_EOLNI; + fsl_chan_xfer_ld_queue(fsl_chan); + } + + if (stat) + dev_dbg(fsl_chan->dev, "event: unhandled sr 0x%02x\n", + stat); + + dev_dbg(fsl_chan->dev, "event: Exit\n"); + tasklet_schedule(&fsl_chan->tasklet); + return IRQ_HANDLED; +} + +static irqreturn_t fsl_dma_do_interrupt(int irq, void *data) +{ + struct fsl_dma_device *fdev = (struct fsl_dma_device *)data; + u32 gsr; + int ch_nr; + + gsr = (fdev->feature & FSL_DMA_BIG_ENDIAN) ? in_be32(fdev->reg_base) + : in_le32(fdev->reg_base); + ch_nr = (32 - ffs(gsr)) / 8; + + return fdev->chan[ch_nr] ? fsl_dma_chan_do_interrupt(irq, + fdev->chan[ch_nr]) : IRQ_NONE; +} + +static void dma_do_tasklet(unsigned long data) +{ + struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data; + fsl_chan_ld_cleanup(fsl_chan); +} + +static void fsl_dma_callback_test(struct fsl_dma_chan *fsl_chan) +{ + if (fsl_chan) + dev_info(fsl_chan->dev, "selftest: callback is ok!\n"); +} + +static int fsl_dma_self_test(struct fsl_dma_chan *fsl_chan) +{ + struct dma_chan *chan; + int err = 0; + dma_addr_t dma_dest, dma_src; + dma_cookie_t cookie; + u8 *src, *dest; + int i; + size_t test_size; + struct dma_async_tx_descriptor *tx1, *tx2, *tx3; + + test_size = 4096; + + src = kmalloc(test_size * 2, GFP_KERNEL); + if (!src) { + dev_err(fsl_chan->dev, + "selftest: Cannot alloc memory for test!\n"); + err = -ENOMEM; + goto out; + } + + dest = src + test_size; + + for (i = 0; i < test_size; i++) + src[i] = (u8) i; + + chan = &fsl_chan->common; + + if (fsl_dma_alloc_chan_resources(chan) < 1) { + dev_err(fsl_chan->dev, + "selftest: Cannot alloc resources for DMA\n"); + err = -ENODEV; + goto out; + } + + /* TX 1 */ + dma_src = dma_map_single(fsl_chan->dev, src, test_size / 2, + DMA_TO_DEVICE); + dma_dest = dma_map_single(fsl_chan->dev, dest, test_size / 2, + DMA_FROM_DEVICE); + tx1 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 2, 0); + async_tx_ack(tx1); + + cookie = fsl_dma_tx_submit(tx1); + fsl_dma_memcpy_issue_pending(chan); + msleep(2); + + if (fsl_dma_is_complete(chan, cookie, NULL, NULL) != DMA_SUCCESS) { + dev_err(fsl_chan->dev, "selftest: Time out!\n"); + err = -ENODEV; + goto out; + } + + /* Test free and re-alloc channel resources */ + fsl_dma_free_chan_resources(chan); + + if (fsl_dma_alloc_chan_resources(chan) < 1) { + dev_err(fsl_chan->dev, + "selftest: Cannot alloc resources for DMA\n"); + err = -ENODEV; + goto free_resources; + } + + /* Continue to test + * TX 2 + */ + dma_src = dma_map_single(fsl_chan->dev, src + test_size / 2, + test_size / 4, DMA_TO_DEVICE); + dma_dest = dma_map_single(fsl_chan->dev, dest + test_size / 2, + test_size / 4, DMA_FROM_DEVICE); + tx2 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 4, 0); + async_tx_ack(tx2); + + /* TX 3 */ + dma_src = dma_map_single(fsl_chan->dev, src + test_size * 3 / 4, + test_size / 4, DMA_TO_DEVICE); + dma_dest = dma_map_single(fsl_chan->dev, dest + test_size * 3 / 4, + test_size / 4, DMA_FROM_DEVICE); + tx3 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 4, 0); + async_tx_ack(tx3); + + /* Test exchanging the prepared tx sort */ + cookie = fsl_dma_tx_submit(tx3); + cookie = fsl_dma_tx_submit(tx2); + +#ifdef FSL_DMA_CALLBACKTEST + if (dma_has_cap(DMA_INTERRUPT, ((struct fsl_dma_device *) + dev_get_drvdata(fsl_chan->dev->parent))->common.cap_mask)) { + tx3->callback = fsl_dma_callback_test; + tx3->callback_param = fsl_chan; + } +#endif + fsl_dma_memcpy_issue_pending(chan); + msleep(2); + + if (fsl_dma_is_complete(chan, cookie, NULL, NULL) != DMA_SUCCESS) { + dev_err(fsl_chan->dev, "selftest: Time out!\n"); + err = -ENODEV; + goto free_resources; + } + + err = memcmp(src, dest, test_size); + if (err) { + for (i = 0; (*(src + i) == *(dest + i)) && (i < test_size); + i++); + dev_err(fsl_chan->dev, "selftest: Test failed, data %d/%d is " + "error! src 0x%x, dest 0x%x\n", + i, test_size, *(src + i), *(dest + i)); + } + +free_resources: + fsl_dma_free_chan_resources(chan); +out: + kfree(src); + return err; +} + +static int __devinit of_fsl_dma_chan_probe(struct of_device *dev, + const struct of_device_id *match) +{ + struct fsl_dma_device *fdev; + struct fsl_dma_chan *new_fsl_chan; + int err; + + fdev = dev_get_drvdata(dev->dev.parent); + BUG_ON(!fdev); + + /* alloc channel */ + new_fsl_chan = kzalloc(sizeof(struct fsl_dma_chan), GFP_KERNEL); + if (!new_fsl_chan) { + dev_err(&dev->dev, "No free memory for allocating " + "dma channels!\n"); + err = -ENOMEM; + goto err; + } + + /* get dma channel register base */ + err = of_address_to_resource(dev->node, 0, &new_fsl_chan->reg); + if (err) { + dev_err(&dev->dev, "Can't get %s property 'reg'\n", + dev->node->full_name); + goto err; + } + + new_fsl_chan->feature = *(u32 *)match->data; + + if (!fdev->feature) + fdev->feature = new_fsl_chan->feature; + + /* If the DMA device's feature is different than its channels', + * report the bug. + */ + WARN_ON(fdev->feature != new_fsl_chan->feature); + + new_fsl_chan->dev = &dev->dev; + new_fsl_chan->reg_base = ioremap(new_fsl_chan->reg.start, + new_fsl_chan->reg.end - new_fsl_chan->reg.start + 1); + + new_fsl_chan->id = ((new_fsl_chan->reg.start - 0x100) & 0xfff) >> 7; + if (new_fsl_chan->id > FSL_DMA_MAX_CHANS_PER_DEVICE) { + dev_err(&dev->dev, "There is no %d channel!\n", + new_fsl_chan->id); + err = -EINVAL; + goto err; + } + fdev->chan[new_fsl_chan->id] = new_fsl_chan; + tasklet_init(&new_fsl_chan->tasklet, dma_do_tasklet, + (unsigned long)new_fsl_chan); + + /* Init the channel */ + dma_init(new_fsl_chan); + + /* Clear cdar registers */ + set_cdar(new_fsl_chan, 0); + + switch (new_fsl_chan->feature & FSL_DMA_IP_MASK) { + case FSL_DMA_IP_85XX: + new_fsl_chan->toggle_ext_start = fsl_chan_toggle_ext_start; + new_fsl_chan->toggle_ext_pause = fsl_chan_toggle_ext_pause; + case FSL_DMA_IP_83XX: + new_fsl_chan->set_src_loop_size = fsl_chan_set_src_loop_size; + new_fsl_chan->set_dest_loop_size = fsl_chan_set_dest_loop_size; + } + + spin_lock_init(&new_fsl_chan->desc_lock); + INIT_LIST_HEAD(&new_fsl_chan->ld_queue); + + new_fsl_chan->common.device = &fdev->common; + + /* Add the channel to DMA device channel list */ + list_add_tail(&new_fsl_chan->common.device_node, + &fdev->common.channels); + fdev->common.chancnt++; + + new_fsl_chan->irq = irq_of_parse_and_map(dev->node, 0); + if (new_fsl_chan->irq != NO_IRQ) { + err = request_irq(new_fsl_chan->irq, + &fsl_dma_chan_do_interrupt, IRQF_SHARED, + "fsldma-channel", new_fsl_chan); + if (err) { + dev_err(&dev->dev, "DMA channel %s request_irq error " + "with return %d\n", dev->node->full_name, err); + goto err; + } + } + +#ifdef CONFIG_FSL_DMA_SELFTEST + err = fsl_dma_self_test(new_fsl_chan); + if (err) + goto err; +#endif + + dev_info(&dev->dev, "#%d (%s), irq %d\n", new_fsl_chan->id, + match->compatible, new_fsl_chan->irq); + + return 0; +err: + dma_halt(new_fsl_chan); + iounmap(new_fsl_chan->reg_base); + free_irq(new_fsl_chan->irq, new_fsl_chan); + list_del(&new_fsl_chan->common.device_node); + kfree(new_fsl_chan); + return err; +} + +const u32 mpc8540_dma_ip_feature = FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN; +const u32 mpc8349_dma_ip_feature = FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN; + +static struct of_device_id of_fsl_dma_chan_ids[] = { + { + .compatible = "fsl,mpc8540-dma-channel", + .data = (void *)&mpc8540_dma_ip_feature, + }, + { + .compatible = "fsl,mpc8349-dma-channel", + .data = (void *)&mpc8349_dma_ip_feature, + }, + {} +}; + +static struct of_platform_driver of_fsl_dma_chan_driver = { + .name = "of-fsl-dma-channel", + .match_table = of_fsl_dma_chan_ids, + .probe = of_fsl_dma_chan_probe, +}; + +static __init int of_fsl_dma_chan_init(void) +{ + return of_register_platform_driver(&of_fsl_dma_chan_driver); +} + +static int __devinit of_fsl_dma_probe(struct of_device *dev, + const struct of_device_id *match) +{ + int err; + unsigned int irq; + struct fsl_dma_device *fdev; + + fdev = kzalloc(sizeof(struct fsl_dma_device), GFP_KERNEL); + if (!fdev) { + dev_err(&dev->dev, "No enough memory for 'priv'\n"); + err = -ENOMEM; + goto err; + } + fdev->dev = &dev->dev; + INIT_LIST_HEAD(&fdev->common.channels); + + /* get DMA controller register base */ + err = of_address_to_resource(dev->node, 0, &fdev->reg); + if (err) { + dev_err(&dev->dev, "Can't get %s property 'reg'\n", + dev->node->full_name); + goto err; + } + + dev_info(&dev->dev, "Probe the Freescale DMA driver for %s " + "controller at 0x%08x...\n", + match->compatible, fdev->reg.start); + fdev->reg_base = ioremap(fdev->reg.start, fdev->reg.end + - fdev->reg.start + 1); + + dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask); + dma_cap_set(DMA_INTERRUPT, fdev->common.cap_mask); + fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources; + fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources; + fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy; + fdev->common.device_is_tx_complete = fsl_dma_is_complete; + fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending; + fdev->common.device_dependency_added = fsl_dma_dependency_added; + fdev->common.dev = &dev->dev; + + irq = irq_of_parse_and_map(dev->node, 0); + if (irq != NO_IRQ) { + err = request_irq(irq, &fsl_dma_do_interrupt, IRQF_SHARED, + "fsldma-device", fdev); + if (err) { + dev_err(&dev->dev, "DMA device request_irq error " + "with return %d\n", err); + goto err; + } + } + + dev_set_drvdata(&(dev->dev), fdev); + of_platform_bus_probe(dev->node, of_fsl_dma_chan_ids, &dev->dev); + + dma_async_device_register(&fdev->common); + return 0; + +err: + iounmap(fdev->reg_base); + kfree(fdev); + return err; +} + +static struct of_device_id of_fsl_dma_ids[] = { + { .compatible = "fsl,mpc8540-dma", }, + { .compatible = "fsl,mpc8349-dma", }, + {} +}; + +static struct of_platform_driver of_fsl_dma_driver = { + .name = "of-fsl-dma", + .match_table = of_fsl_dma_ids, + .probe = of_fsl_dma_probe, +}; + +static __init int of_fsl_dma_init(void) +{ + return of_register_platform_driver(&of_fsl_dma_driver); +} + +subsys_initcall(of_fsl_dma_chan_init); +subsys_initcall(of_fsl_dma_init); 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