[PATCH] dmaengine: sh: Add support DMA-Engine driver for DMA of SuperH
From: Nobuhiro Iwamatsu
Date: Thu Mar 12 2009 - 02:45:17 EST
This supports DMA-Engine driver for DMA of SuperH.
This supported all DMA channels, and it was tested in SH7722/SH7780.
This can not use with SH DMA API and can control this in Kconfig.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Cc: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Cc: Maciej Sosnowski <maciej.sosnowski@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
---
arch/sh/drivers/dma/Kconfig | 12 +-
arch/sh/drivers/dma/Makefile | 3 +-
arch/sh/include/asm/dma-sh.h | 11 +
drivers/dma/Kconfig | 9 +
drivers/dma/Makefile | 2 +
drivers/dma/shdma.c | 743 ++++++++++++++++++++++++++++++++++++++++++
drivers/dma/shdma.h | 65 ++++
7 files changed, 840 insertions(+), 5 deletions(-)
create mode 100644 drivers/dma/shdma.c
create mode 100644 drivers/dma/shdma.h
diff --git a/arch/sh/drivers/dma/Kconfig b/arch/sh/drivers/dma/Kconfig
index 57d95fc..f556629 100644
--- a/arch/sh/drivers/dma/Kconfig
+++ b/arch/sh/drivers/dma/Kconfig
@@ -1,14 +1,20 @@
menu "DMA support"
-config SH_DMA_API
- bool
config SH_DMA
bool "SuperH on-chip DMA controller (DMAC) support"
depends on CPU_SH3 || CPU_SH4
- select SH_DMA_API
default n
+config SH_DMA_API
+ depends on SH_DMA
+ bool "SuperH DMA API support"
+ default n
+ help
+ SH_DMA_API always enabled DMA API of used SuperH.
+ If you want to use DMA ENGINE, you must not enable this.
+ Please enable DMA_ENGINE and SH_DMAE.
+
config NR_ONCHIP_DMA_CHANNELS
int
depends on SH_DMA
diff --git a/arch/sh/drivers/dma/Makefile b/arch/sh/drivers/dma/Makefile
index ab956ad..c78ddd3 100644
--- a/arch/sh/drivers/dma/Makefile
+++ b/arch/sh/drivers/dma/Makefile
@@ -2,7 +2,6 @@
# Makefile for the SuperH DMA specific kernel interface routines under Linux.
#
-obj-$(CONFIG_SH_DMA_API) += dma-api.o dma-sysfs.o
-obj-$(CONFIG_SH_DMA) += dma-sh.o
+obj-$(CONFIG_SH_DMA_API) += dma-sh.o dma-api.o dma-sysfs.o
obj-$(CONFIG_SH_DREAMCAST) += dma-pvr2.o dma-g2.o
obj-$(CONFIG_SH_DMABRG) += dmabrg.o
diff --git a/arch/sh/include/asm/dma-sh.h b/arch/sh/include/asm/dma-sh.h
index 0c8f8e1..c356df4 100644
--- a/arch/sh/include/asm/dma-sh.h
+++ b/arch/sh/include/asm/dma-sh.h
@@ -115,4 +115,15 @@ static u32 dma_base_addr[] __maybe_unused = {
#define CHCR 0x0C
#define DMAOR 0x40
+/* for dma engine */
+/* mode */
+#define SHDMA_MIX_IRQ (1 << 1)
+#define SHDMA_DMAOR1 (1 << 2)
+#define SHDMA_DMAE1 (1 << 3)
+
+struct sh_dmae_pdata {
+ unsigned long int2b3;
+ unsigned int mode;
+};
+
#endif /* __DMA_SH_H */
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 7f9e1ec..af74ff3 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -81,6 +81,15 @@ config MX3_IPU_IRQS
To avoid bloating the irq_desc[] array we allocate a sufficient
number of IRQ slots and map them dynamically to specific sources.
+config SH_DMAE
+ tristate "Renesas SuperH DMAC support"
+ depends on SUPERH && SH_DMA
+ depends on !SH_DMA_API
+ select DMA_ENGINE
+ help
+ There is SH_DMA_API which is another DMA implementation in SuperH.
+ When you want to use this, please enable SH_DMA_API.
+
config DMA_ENGINE
bool
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 2e5dc96..0d2f3e9 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -8,3 +8,5 @@ obj-$(CONFIG_FSL_DMA) += fsldma.o
obj-$(CONFIG_MV_XOR) += mv_xor.o
obj-$(CONFIG_DW_DMAC) += dw_dmac.o
obj-$(CONFIG_MX3_IPU) += ipu/
+obj-$(CONFIG_SH_DMAE) += shdma.o
+
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
new file mode 100644
index 0000000..7f1ef7b
--- /dev/null
+++ b/drivers/dma/shdma.c
@@ -0,0 +1,743 @@
+/*
+ * Renesas SuperH DMA Engine support
+ *
+ * base is drivers/dma/flsdma.c
+ *
+ * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>
+ * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
+ * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * 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.
+ *
+ * - DMA of SuperH does not have Hardware DMA chain mode.
+ * - MAX DMA size is 16MB.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/platform_device.h>
+#include <cpu/dma.h>
+#include <asm/dma-sh.h>
+#include "shdma.h"
+
+/* DMA descriptor control */
+#define DESC_LAST (-1)
+#define DESC_COMP (1)
+#define DESC_NCOMP (0)
+
+/*
+ * Define the default configuration for dual address memory-memory transfer.
+ * The 0x400 value represents auto-request, external->external.
+ */
+#define RS_DEFAULT RS_DUAL
+
+#define SH_DMAC_CHAN_BASE(id) (dma_base_addr[id])
+static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
+{
+ ctrl_outl(data, (SH_DMAC_CHAN_BASE(sh_dc->id) + reg));
+}
+
+static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
+{
+ return ctrl_inl((SH_DMAC_CHAN_BASE(sh_dc->id) + reg));
+}
+
+static void sh_dmae_writew(struct sh_dmae_chan *sh_dc, u16 data, u32 reg)
+{
+ ctrl_outw(data, (SH_DMAC_CHAN_BASE(sh_dc->id) + reg));
+}
+
+static u16 sh_dmae_readw(struct sh_dmae_chan *sh_dc, u32 reg)
+{
+ return ctrl_inw((SH_DMAC_CHAN_BASE(sh_dc->id) + reg));
+}
+
+static void dmae_init(struct sh_dmae_chan *sh_chan)
+{
+ u32 chcr = RS_DEFAULT; /* default is DUAL mode */
+ sh_dmae_writel(sh_chan, chcr, CHCR);
+}
+
+/*
+ * Reset DMA controler
+ *
+ * SH7780 has two DMAOR register
+ */
+static void sh_dmae_ctl_stop(int id)
+{
+ unsigned short dmaor = dmaor_read_reg(id);
+
+ dmaor &= ~(DMAOR_NMIF | DMAOR_AE);
+ dmaor_write_reg(id, dmaor);
+}
+
+static int sh_dmae_rst(int id)
+{
+ unsigned short dmaor;
+
+ sh_dmae_ctl_stop(id);
+ dmaor = (dmaor_read_reg(id)|DMAOR_INIT);
+
+ dmaor_write_reg(id, dmaor);
+ if ((dmaor_read_reg(id) & (DMAOR_AE | DMAOR_NMIF))) {
+ pr_warning(KERN_ERR "dma-sh: Can't initialize DMAOR.\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int dmae_is_idle(struct sh_dmae_chan *sh_chan)
+{
+ u32 chcr = sh_dmae_readl(sh_chan, CHCR);
+ if (chcr & CHCR_DE) {
+ if (!(chcr & CHCR_TE))
+ return -EBUSY; /* working */
+ }
+ return 0; /* waiting */
+}
+
+static inline unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan)
+{
+ u32 chcr = sh_dmae_readl(sh_chan, CHCR);
+ return ts_shift[(chcr & CHCR_TS_MASK) >> CHCR_TS_SHIFT];
+}
+
+static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs hw)
+{
+ sh_dmae_writel(sh_chan, hw.sar, SAR);
+ sh_dmae_writel(sh_chan, hw.dar, DAR);
+ sh_dmae_writel(sh_chan, hw.tcr, TCR);
+}
+
+static void dmae_start(struct sh_dmae_chan *sh_chan)
+{
+ u32 chcr = sh_dmae_readl(sh_chan, CHCR);
+
+ chcr |= (CHCR_DE|CHCR_IE);
+ sh_dmae_writel(sh_chan, chcr, CHCR);
+}
+
+static void dmae_halt(struct sh_dmae_chan *sh_chan)
+{
+ u32 chcr = sh_dmae_readl(sh_chan, CHCR);
+ chcr &= ~(CHCR_DE | CHCR_TE | CHCR_IE);
+ sh_dmae_writel(sh_chan, chcr, CHCR);
+}
+
+static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
+{
+ int ret = dmae_is_idle(sh_chan);
+ /* When DMA was working, can not set data to CHCR */
+ if (ret)
+ return ret;
+ sh_dmae_writel(sh_chan, val, CHCR);
+ return 0;
+}
+
+#define DMARS1_ADDR 0x04
+#define DMARS2_ADDR 0x08
+#define DMARS_SHIFT 8
+#define DMARS_CHAN_MSK 0x01
+static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
+{
+ u32 addr;
+ u16 dmars;
+ int shift = 0;
+ int ret = dmae_is_idle(sh_chan);
+ if (ret)
+ return ret;
+
+ if (sh_chan->id & DMARS_CHAN_MSK)
+ shift = DMARS_SHIFT;
+
+ switch (sh_chan->id) {
+ /* DMARS0 */
+ case 0:
+ case 1:
+ addr = SH_DMARS_BASE;
+ break;
+ /* DMARS1 */
+ case 2:
+ case 3:
+ addr = (SH_DMARS_BASE + DMARS1_ADDR);
+ break;
+ /* DMARS2 */
+ case 4:
+ case 5:
+ addr = (SH_DMARS_BASE + DMARS2_ADDR);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ dmars = sh_dmae_readw(sh_chan, addr);
+ sh_dmae_writew(sh_chan,
+ (val << shift) | (dmars & (shift ? 0xFF00 : 0x00FF)),
+ addr);
+ return 0;
+}
+
+static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct sh_desc *desc = tx_to_sh_desc(tx);
+ struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan);
+ unsigned long flags;
+ dma_cookie_t cookie;
+
+ spin_lock_irqsave(&sh_chan->desc_lock, flags);
+
+ cookie = sh_chan->common.cookie;
+ cookie++;
+ if (cookie < 0)
+ cookie = 1;
+
+ /* If desc only in the case of 1 */
+ if (desc->async_tx.cookie != -EBUSY)
+ desc->async_tx.cookie = cookie;
+ sh_chan->common.cookie = desc->async_tx.cookie;
+
+ list_splice_init(&desc->async_tx.tx_list, sh_chan->ld_queue.prev);
+
+ spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
+
+ return cookie;
+}
+
+static struct sh_desc *sh_dmae_alloc_descriptor(struct sh_dmae_chan *sh_chan)
+{
+ struct sh_desc *desc_sw;
+ desc_sw = kzalloc(sizeof(struct sh_desc), GFP_KERNEL);
+ if (desc_sw) {
+ dma_async_tx_descriptor_init(&desc_sw->async_tx,
+ &sh_chan->common);
+ desc_sw->async_tx.tx_submit = sh_dmae_tx_submit;
+ INIT_LIST_HEAD(&desc_sw->async_tx.tx_list);
+ }
+
+ return desc_sw;
+}
+
+static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
+{
+ return 1;
+}
+
+/*
+ * sh_dma_free_chan_resources - Free all resources of the channel.
+ */
+static void sh_dmae_free_chan_resources(struct dma_chan *chan)
+{
+ struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
+ struct sh_desc *desc, *_desc;
+ unsigned long flags;
+
+ dev_dbg(sh_chan->dev, "Free all channel resources.\n");
+ spin_lock_irqsave(&sh_chan->desc_lock, flags);
+ list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
+ list_del(&desc->node);
+ /* free link descriptor */
+ kfree(desc);
+ }
+ spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
+}
+
+static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
+ struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
+ size_t len, unsigned long flags)
+{
+ struct sh_dmae_chan *sh_chan;
+ struct sh_desc *first = NULL, *prev = NULL, *new;
+ size_t copy_size;
+ int cnt = 0;
+ LIST_HEAD(link_chain);
+
+ if (!chan)
+ return NULL;
+
+ if (!len)
+ return NULL;
+
+ sh_chan = to_sh_chan(chan);
+
+ do {
+ /* Allocate the link descriptor from DMA pool */
+ new = sh_dmae_alloc_descriptor(sh_chan);
+ if (!new) {
+ dev_err(sh_chan->dev,
+ "No free memory for link descriptor\n");
+ return NULL;
+ }
+
+ copy_size = min(len, (size_t)SH_DMA_TCR_MAX);
+
+ new->hw.sar = dma_src;
+ new->hw.dar = dma_dest;
+ new->hw.tcr = (copy_size >> calc_xmit_shift(sh_chan));
+ if (!first)
+ first = new;
+
+ new->mark = DESC_NCOMP;
+ async_tx_ack(&new->async_tx);
+
+ prev = new;
+ len -= copy_size;
+ dma_src += copy_size;
+ dma_dest += copy_size;
+ cnt++;
+ /* Insert the link descriptor to the LD ring */
+ list_add_tail(&new->node, &first->async_tx.tx_list);
+ } while (len);
+
+ new->async_tx.flags = flags; /* client is in control of this ack */
+ new->async_tx.cookie = -EBUSY;
+
+ sh_chan->set_chcr = dmae_set_chcr;
+ sh_chan->set_dmars = dmae_set_dmars;
+
+ return first ? &first->async_tx : NULL;
+}
+
+/*
+ * sh_chan_ld_cleanup - Clean up link descriptors
+ *
+ * This function clean up the ld_queue of DMA channel.
+ */
+static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan)
+{
+ struct sh_desc *desc, *_desc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sh_chan->desc_lock, flags);
+ list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
+ dma_async_tx_callback callback;
+ void *callback_param;
+
+ /* non send data */
+ if (desc->mark == DESC_NCOMP)
+ break;
+
+ /* send data sesc */
+ callback = desc->async_tx.callback;
+ callback_param = desc->async_tx.callback_param;
+
+ /* Remove from ld_queue list */
+ list_del(&desc->node);
+
+ dev_dbg(sh_chan->dev, "link descriptor %p will be recycle.\n",
+ desc);
+ kfree(desc);
+ /* Run the link descriptor callback function */
+ if (callback) {
+ spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
+ dev_dbg(sh_chan->dev, "link descriptor %p callback\n",
+ desc);
+ callback(callback_param);
+ spin_lock_irqsave(&sh_chan->desc_lock, flags);
+ }
+ }
+ spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
+}
+
+static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
+{
+ struct list_head *ld_node;
+ unsigned long flags;
+ struct sh_dmae_regs hw;
+
+ if (dmae_is_idle(sh_chan))
+ return;
+
+ dmae_halt(sh_chan);
+ spin_lock_irqsave(&sh_chan->desc_lock, flags);
+
+ /* Find the first un-transfer desciptor */
+ for (ld_node = sh_chan->ld_queue.next;
+ (ld_node != &sh_chan->ld_queue)
+ && (to_sh_desc(ld_node)->mark == DESC_COMP);
+ ld_node = ld_node->next)
+ cpu_relax();
+
+ spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
+
+ if (ld_node != &sh_chan->ld_queue) {
+ /* Get the ld start address from ld_queue */
+ hw = to_sh_desc(ld_node)->hw;
+ dmae_set_reg(sh_chan, hw);
+ dmae_start(sh_chan);
+ }
+}
+
+static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
+{
+ struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
+
+ sh_chan_xfer_ld_queue(sh_chan);
+}
+
+static enum dma_status sh_dmae_is_complete(struct dma_chan *chan,
+ dma_cookie_t cookie,
+ dma_cookie_t *done,
+ dma_cookie_t *used)
+{
+ struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
+ dma_cookie_t last_used;
+ dma_cookie_t last_complete;
+
+ sh_dmae_chan_ld_cleanup(sh_chan);
+
+ last_used = chan->cookie;
+ last_complete = sh_chan->completed_cookie;
+ if (last_complete == -EBUSY)
+ last_complete = last_used;
+
+ if (done)
+ *done = last_complete;
+
+ if (used)
+ *used = last_used;
+
+ return dma_async_is_complete(cookie, last_complete, last_used);
+}
+
+static irqreturn_t sh_dmae_interrupt(int irq, void *data)
+{
+ irqreturn_t ret = IRQ_NONE;
+ struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
+ u32 chcr = sh_dmae_readl(sh_chan, CHCR);
+
+ if (chcr & CHCR_TE) {
+ struct sh_desc *desc, *cur_desc = NULL;
+ u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
+
+ list_for_each_entry(desc, &sh_chan->ld_queue, node) {
+ if ((desc->hw.sar + desc->hw.tcr) == sar_buf) {
+ cur_desc = desc;
+ break;
+ }
+ }
+ if (cur_desc) {
+ switch (cur_desc->async_tx.cookie) {
+ case 0: /* other desc data */
+ break;
+ case -EBUSY: /* last desc */
+ sh_chan->completed_cookie =
+ cur_desc->async_tx.cookie;
+ break;
+ default: /* first desc ( 0 < )*/
+ sh_chan->completed_cookie =
+ cur_desc->async_tx.cookie - 1;
+ break;
+ }
+ cur_desc->mark = DESC_COMP;
+ }
+ /* Next desc */
+ sh_chan_xfer_ld_queue(sh_chan);
+ ret = IRQ_HANDLED;
+ }
+ tasklet_schedule(&sh_chan->tasklet);
+ return ret;
+}
+
+#if defined(CONFIG_CPU_SH4)
+static irqreturn_t sh_dmae_err(int irq, void *data)
+{
+ int err = 0;
+ struct sh_dmae_device *shdev = (struct sh_dmae_device *)data;
+
+ /* IRQ Multi */
+ if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
+ int cnt = 0;
+ switch (irq) {
+#if defined(DMTE6_IRQ) && defined(DMAE1_IRQ)
+ case DMTE6_IRQ:
+ cnt++;
+#endif
+ case DMTE0_IRQ:
+ if (dmaor_read_reg(cnt) & (DMAOR_NMIF | DMAOR_AE)) {
+ disable_irq(irq);
+ return IRQ_HANDLED;
+ }
+ default:
+ return IRQ_NONE;
+ }
+ } else {
+ /* reset dma controler */
+ err = sh_dmae_rst(0);
+ if (err)
+ return err;
+ if (shdev->pdata.mode & SHDMA_DMAOR1) {
+ err = sh_dmae_rst(1);
+ if (err)
+ return err;
+ }
+ disable_irq(irq);
+ return IRQ_HANDLED;
+ }
+}
+#endif
+
+static void dmae_do_tasklet(unsigned long data)
+{
+ struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
+ sh_dmae_chan_ld_cleanup(sh_chan);
+}
+
+static unsigned int get_dmae_irq(unsigned int id)
+{
+ unsigned int irq = 0;
+ if (id < ARRAY_SIZE(dmte_irq_map))
+ irq = dmte_irq_map[id];
+ return irq;
+}
+
+static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id)
+{
+ int err;
+ unsigned int irq = get_dmae_irq(id);
+ unsigned long irqflags = IRQF_DISABLED;
+ struct sh_dmae_chan *new_sh_chan;
+
+ /* alloc channel */
+ new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
+ if (!new_sh_chan) {
+ dev_err(shdev->dev, "No free memory for allocating "
+ "dma channels!\n");
+ return -ENOMEM;
+ }
+
+ new_sh_chan->dev = shdev->dev;
+ shdev->chan[id] = new_sh_chan;
+ new_sh_chan->id = id;
+
+ /* Init DMA tasklet */
+ tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
+ (unsigned long)new_sh_chan);
+
+ /* Init the channel */
+ dmae_init(new_sh_chan);
+
+ spin_lock_init(&new_sh_chan->desc_lock);
+
+ /* Init descripter manage list */
+ INIT_LIST_HEAD(&new_sh_chan->ld_queue);
+
+ /* copy struct dma_device */
+ new_sh_chan->common.device = &shdev->common;
+
+ /* Add the channel to DMA device channel list */
+ list_add_tail(&new_sh_chan->common.device_node,
+ &shdev->common.channels);
+ shdev->common.chancnt++;
+
+ if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
+ irqflags = IRQF_SHARED;
+#if defined(DMTE6_IRQ)
+ if (irq >= DMTE6_IRQ)
+ irq = DMTE6_IRQ;
+ else
+#endif
+ irq = DMTE0_IRQ;
+ }
+
+ snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
+ "sh-dmae%d", new_sh_chan->id);
+
+ /* set up channel irq */
+ err = request_irq(irq, &sh_dmae_interrupt,
+ irqflags, new_sh_chan->dev_id, new_sh_chan);
+ if (err) {
+ dev_err(shdev->dev, "DMA channel %d request_irq error "
+ "with return %d\n", id, err);
+ goto err_no_irq;
+ }
+
+ return 0;
+
+err_no_irq:
+ /* remove from dmaengine device node */
+ list_del(&new_sh_chan->common.device_node);
+ kfree(new_sh_chan);
+ return err;
+}
+
+static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
+{
+ int i;
+
+ for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
+ if (shdev->chan[i]) {
+ struct sh_dmae_chan *shchan = shdev->chan[i];
+ if (!(shdev->pdata.mode & SHDMA_MIX_IRQ))
+ free_irq(dmte_irq_map[i], shchan);
+
+ list_del(&shchan->common.device_node);
+ kfree(shchan);
+ shdev->chan[i] = NULL;
+ }
+ }
+ shdev->common.chancnt = 0;
+}
+
+static int __init sh_dmae_probe(struct platform_device *pdev)
+{
+ int err = 0, cnt, ecnt;
+ unsigned long irqflags = IRQF_DISABLED;
+ int eirq[] = { DMAE0_IRQ,
+#if defined(DMAE1_IRQ)
+ DMAE1_IRQ
+#endif
+ };
+ struct sh_dmae_device *shdev;
+
+ shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
+ if (!shdev) {
+ dev_err(&pdev->dev, "No enough memory\n");
+ err = -ENOMEM;
+ goto shdev_err;
+ }
+
+ /* get platform data */
+ if (!pdev->dev.platform_data)
+ goto shdev_err;
+
+ /* platform data */
+ memcpy(&shdev->pdata, pdev->dev.platform_data,
+ sizeof(struct sh_dmae_pdata));
+
+ /* reset dma controler */
+ err = sh_dmae_rst(0);
+ if (err)
+ goto rst_err;
+
+ /* SH7780/85/23 has DMAOR1 */
+ if (shdev->pdata.mode & SHDMA_DMAOR1) {
+ err = sh_dmae_rst(1);
+ if (err)
+ goto rst_err;
+ }
+
+ shdev->dev = &pdev->dev;
+ INIT_LIST_HEAD(&shdev->common.channels);
+
+ dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
+ shdev->common.device_alloc_chan_resources
+ = sh_dmae_alloc_chan_resources;
+ shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
+ shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
+ shdev->common.device_is_tx_complete = sh_dmae_is_complete;
+ shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
+ shdev->common.dev = &pdev->dev;
+
+ /* Non Mix IRQ mode SH7722/SH7730 etc... */
+ if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
+ irqflags = IRQF_SHARED;
+ eirq[0] = DMTE0_IRQ;
+#if defined(DMTE6_IRQ) && defined(DMAE1_IRQ)
+ eirq[1] = DMTE6_IRQ;
+#endif
+ }
+
+ for (ecnt = 0 ; ecnt < ARRAY_SIZE(eirq); ecnt++) {
+ err = request_irq(eirq[ecnt], sh_dmae_err,
+ irqflags, "DMAC Address Error", shdev);
+ if (err) {
+ dev_err(&pdev->dev, "DMA device request_irq"
+ "erro (irq %d) with return %d\n",
+ eirq[ecnt], err);
+ goto eirq_err;
+ }
+ }
+
+ /* Create DMA Channel */
+ for (cnt = 0 ; cnt < MAX_DMA_CHANNELS ; cnt++) {
+ err = sh_dmae_chan_probe(shdev, cnt);
+ if (err)
+ goto chan_probe_err;
+ }
+
+ platform_set_drvdata(pdev, shdev);
+ dma_async_device_register(&shdev->common);
+
+ return err;
+
+chan_probe_err:
+ sh_dmae_chan_remove(shdev);
+
+eirq_err:
+ for (ecnt-- ; ecnt >= 0; ecnt--)
+ free_irq(eirq[ecnt], shdev);
+
+rst_err:
+ kfree(shdev);
+
+shdev_err:
+ return err;
+}
+
+static int __exit sh_dmae_remove(struct platform_device *pdev)
+{
+ struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
+
+ dma_async_device_unregister(&shdev->common);
+
+ if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
+ free_irq(DMTE0_IRQ, shdev);
+#if defined(DMTE6_IRQ)
+ free_irq(DMTE6_IRQ, shdev);
+#endif
+ }
+
+ /* channel data remove */
+ sh_dmae_chan_remove(shdev);
+
+ if (!(shdev->pdata.mode & SHDMA_MIX_IRQ)) {
+ free_irq(DMAE0_IRQ, shdev);
+#if defined(DMAE1_IRQ)
+ free_irq(DMAE1_IRQ, shdev);
+#endif
+ }
+ kfree(shdev);
+
+ return 0;
+}
+
+static void sh_dmae_shutdown(struct platform_device *pdev)
+{
+ struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
+ sh_dmae_ctl_stop(0);
+ if (shdev->pdata.mode & SHDMA_DMAOR1)
+ sh_dmae_ctl_stop(1);
+}
+
+static struct platform_driver sh_dmae_driver = {
+ .remove = __exit_p(sh_dmae_remove),
+ .shutdown = sh_dmae_shutdown,
+ .driver = {
+ .name = "sh-dma-engine",
+ },
+};
+
+static int __init sh_dmae_init(void)
+{
+ return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
+}
+module_init(sh_dmae_init);
+
+static void __exit sh_dmae_exit(void)
+{
+ platform_driver_unregister(&sh_dmae_driver);
+}
+module_exit(sh_dmae_exit);
+
+MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/dma/shdma.h b/drivers/dma/shdma.h
new file mode 100644
index 0000000..5f2d9b6
--- /dev/null
+++ b/drivers/dma/shdma.h
@@ -0,0 +1,65 @@
+/*
+ * Renesas SuperH DMA Engine support
+ *
+ * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>
+ * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
+ *
+ * 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.
+ *
+ */
+#ifndef __DMA_SHDMA_H
+#define __DMA_SHDMA_H
+
+#include <linux/device.h>
+#include <linux/dmapool.h>
+#include <linux/dmaengine.h>
+
+#define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
+
+struct sh_dmae_regs {
+ u32 sar; /* SAR / source address */
+ u32 dar; /* DAR / destination address */
+ u32 tcr; /* TCR / transfer count */
+};
+
+struct sh_desc {
+ struct sh_dmae_regs hw;
+ struct list_head node;
+ struct dma_async_tx_descriptor async_tx;
+ struct list_head *ld;
+ int mark;
+};
+
+struct sh_dmae_chan {
+ dma_cookie_t completed_cookie; /* The maximum cookie completed */
+ spinlock_t desc_lock; /* Descriptor operation lock */
+ struct list_head ld_queue; /* Link descriptors queue */
+ struct dma_chan common; /* DMA common channel */
+ struct device *dev; /* Channel device */
+ struct resource reg; /* Resource for register */
+ struct tasklet_struct tasklet;
+ int id; /* Raw id of this channel */
+ char dev_id[16]; /* unique name per DMAC of channel */
+
+ /* Set chcr */
+ int (*set_chcr)(struct sh_dmae_chan *sh_chan, u32 regs);
+ /* Set DMA resource */
+ int (*set_dmars)(struct sh_dmae_chan *sh_chan, u16 res);
+};
+
+struct sh_dmae_device {
+ struct resource reg; /* Resource for register */
+ struct device *dev;
+ struct dma_device common;
+ struct sh_dmae_chan *chan[CONFIG_NR_ONCHIP_DMA_CHANNELS];
+ struct sh_dmae_pdata pdata;
+};
+
+#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
+#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
+#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
+
+#endif /* __DMA_SHDMA_H */
--
1.6.2
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