* DMA controller
Required properties:
-- compatible: should be "renesas,shdma"
+- compatible: should be of the form "renesas,shdma-<soc>", where <soc> should
+ be replaced with the desired SoC model, e.g.
+ "renesas,shdma-r8a73a4" for the system DMAC on r8a73a4 SoC
Example:
- dmac: dma-mux0 {
+ dmac: dma-multiplexer@0 {
compatible = "renesas,shdma-mux";
#dma-cells = <1>;
- dma-channels = <6>;
+ dma-channels = <20>;
dma-requests = <256>;
- reg = <0 0>; /* Needed for AUXDATA */
- #address-cells = <1>;
- #size-cells = <1>;
+ #address-cells = <2>;
+ #size-cells = <2>;
ranges;
- dma0: shdma@fe008020 {
- compatible = "renesas,shdma";
- reg = <0xfe008020 0x270>,
- <0xfe009000 0xc>;
+ dma0: dma-controller@e6700020 {
+ compatible = "renesas,shdma-r8a73a4";
+ reg = <0 0xe6700020 0 0x89e0>;
interrupt-parent = <&gic>;
- interrupts = <0 34 4
- 0 28 4
- 0 29 4
- 0 30 4
- 0 31 4
- 0 32 4
- 0 33 4>;
+ interrupts = <0 220 4
+ 0 200 4
+ 0 201 4
+ 0 202 4
+ 0 203 4
+ 0 204 4
+ 0 205 4
+ 0 206 4
+ 0 207 4
+ 0 208 4
+ 0 209 4
+ 0 210 4
+ 0 211 4
+ 0 212 4
+ 0 213 4
+ 0 214 4
+ 0 215 4
+ 0 216 4
+ 0 217 4
+ 0 218 4
+ 0 219 4>;
interrupt-names = "error",
"ch0", "ch1", "ch2", "ch3",
- "ch4", "ch5";
- };
-
- dma1: shdma@fe018020 {
- ...
- };
-
- dma2: shdma@fe028020 {
- ...
+ "ch4", "ch5", "ch6", "ch7",
+ "ch8", "ch9", "ch10", "ch11",
+ "ch12", "ch13", "ch14", "ch15",
+ "ch16", "ch17", "ch18", "ch19";
};
};
obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o
obj-$(CONFIG_SH_DMAE) += shdma.o
+shdma-y := shdmac.o
+shdma-objs := $(shdma-y)
obj-$(CONFIG_SUDMAC) += sudmac.o
return NULL;
}
-static int shdma_setup_slave(struct shdma_chan *schan, int slave_id)
+static int shdma_setup_slave(struct shdma_chan *schan, int slave_id,
+ dma_addr_t slave_addr)
{
struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
const struct shdma_ops *ops = sdev->ops;
if (schan->dev->of_node) {
match = schan->hw_req;
- ret = ops->set_slave(schan, match, true);
+ ret = ops->set_slave(schan, match, slave_addr, true);
if (ret < 0)
return ret;
if (test_and_set_bit(slave_id, shdma_slave_used))
return -EBUSY;
- ret = ops->set_slave(schan, match, false);
+ ret = ops->set_slave(schan, match, slave_addr, false);
if (ret < 0) {
clear_bit(slave_id, shdma_slave_used);
return ret;
if (!schan->dev->of_node && match >= slave_num)
return false;
- ret = ops->set_slave(schan, match, true);
+ ret = ops->set_slave(schan, match, 0, true);
if (ret < 0)
return false;
*/
if (slave) {
/* Legacy mode: .private is set in filter */
- ret = shdma_setup_slave(schan, slave->slave_id);
+ ret = shdma_setup_slave(schan, slave->slave_id, 0);
if (ret < 0)
goto esetslave;
} else {
* channel, while using it...
*/
config = (struct dma_slave_config *)arg;
- ret = shdma_setup_slave(schan, config->slave_id);
+ ret = shdma_setup_slave(schan, config->slave_id,
+ config->direction == DMA_DEV_TO_MEM ?
+ config->src_addr : config->dst_addr);
if (ret < 0)
return ret;
break;
const struct of_dev_auxdata *lookup = pdev->dev.platform_data;
int ret;
- if (!lookup)
- return -EINVAL;
-
ret = of_dma_controller_register(pdev->dev.of_node,
shdma_of_xlate, pdev);
if (ret < 0)
+++ /dev/null
-/*
- * Renesas SuperH DMA Engine support
- *
- * base is drivers/dma/flsdma.c
- *
- * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
- * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
- * 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/slab.h>
-#include <linux/interrupt.h>
-#include <linux/dmaengine.h>
-#include <linux/delay.h>
-#include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/sh_dma.h>
-#include <linux/notifier.h>
-#include <linux/kdebug.h>
-#include <linux/spinlock.h>
-#include <linux/rculist.h>
-
-#include "../dmaengine.h"
-#include "shdma.h"
-
-#define SH_DMAE_DRV_NAME "sh-dma-engine"
-
-/* Default MEMCPY transfer size = 2^2 = 4 bytes */
-#define LOG2_DEFAULT_XFER_SIZE 2
-#define SH_DMA_SLAVE_NUMBER 256
-#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1)
-
-/*
- * Used for write-side mutual exclusion for the global device list,
- * read-side synchronization by way of RCU, and per-controller data.
- */
-static DEFINE_SPINLOCK(sh_dmae_lock);
-static LIST_HEAD(sh_dmae_devices);
-
-/*
- * Different DMAC implementations provide different ways to clear DMA channels:
- * (1) none - no CHCLR registers are available
- * (2) one CHCLR register per channel - 0 has to be written to it to clear
- * channel buffers
- * (3) one CHCLR per several channels - 1 has to be written to the bit,
- * corresponding to the specific channel to reset it
- */
-static void channel_clear(struct sh_dmae_chan *sh_dc)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
- const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel +
- sh_dc->shdma_chan.id;
- u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0;
-
- __raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset);
-}
-
-static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
-{
- __raw_writel(data, sh_dc->base + reg);
-}
-
-static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
-{
- return __raw_readl(sh_dc->base + reg);
-}
-
-static u16 dmaor_read(struct sh_dmae_device *shdev)
-{
- void __iomem *addr = shdev->chan_reg + DMAOR;
-
- if (shdev->pdata->dmaor_is_32bit)
- return __raw_readl(addr);
- else
- return __raw_readw(addr);
-}
-
-static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
-{
- void __iomem *addr = shdev->chan_reg + DMAOR;
-
- if (shdev->pdata->dmaor_is_32bit)
- __raw_writel(data, addr);
- else
- __raw_writew(data, addr);
-}
-
-static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
-
- __raw_writel(data, sh_dc->base + shdev->chcr_offset);
-}
-
-static u32 chcr_read(struct sh_dmae_chan *sh_dc)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
-
- return __raw_readl(sh_dc->base + shdev->chcr_offset);
-}
-
-/*
- * Reset DMA controller
- *
- * SH7780 has two DMAOR register
- */
-static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
-{
- unsigned short dmaor;
- unsigned long flags;
-
- spin_lock_irqsave(&sh_dmae_lock, flags);
-
- dmaor = dmaor_read(shdev);
- dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
-
- spin_unlock_irqrestore(&sh_dmae_lock, flags);
-}
-
-static int sh_dmae_rst(struct sh_dmae_device *shdev)
-{
- unsigned short dmaor;
- unsigned long flags;
-
- spin_lock_irqsave(&sh_dmae_lock, flags);
-
- dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
-
- if (shdev->pdata->chclr_present) {
- int i;
- for (i = 0; i < shdev->pdata->channel_num; i++) {
- struct sh_dmae_chan *sh_chan = shdev->chan[i];
- if (sh_chan)
- channel_clear(sh_chan);
- }
- }
-
- dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init);
-
- dmaor = dmaor_read(shdev);
-
- spin_unlock_irqrestore(&sh_dmae_lock, flags);
-
- if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
- dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n");
- return -EIO;
- }
- if (shdev->pdata->dmaor_init & ~dmaor)
- dev_warn(shdev->shdma_dev.dma_dev.dev,
- "DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
- dmaor, shdev->pdata->dmaor_init);
- return 0;
-}
-
-static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
-{
- u32 chcr = chcr_read(sh_chan);
-
- if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
- return true; /* working */
-
- return false; /* waiting */
-}
-
-static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- const struct sh_dmae_pdata *pdata = shdev->pdata;
- int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
- ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
-
- if (cnt >= pdata->ts_shift_num)
- cnt = 0;
-
- return pdata->ts_shift[cnt];
-}
-
-static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- const struct sh_dmae_pdata *pdata = shdev->pdata;
- int i;
-
- for (i = 0; i < pdata->ts_shift_num; i++)
- if (pdata->ts_shift[i] == l2size)
- break;
-
- if (i == pdata->ts_shift_num)
- i = 0;
-
- return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
- ((i << pdata->ts_high_shift) & pdata->ts_high_mask);
-}
-
-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 >> sh_chan->xmit_shift, TCR);
-}
-
-static void dmae_start(struct sh_dmae_chan *sh_chan)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- u32 chcr = chcr_read(sh_chan);
-
- if (shdev->pdata->needs_tend_set)
- sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND);
-
- chcr |= CHCR_DE | shdev->chcr_ie_bit;
- chcr_write(sh_chan, chcr & ~CHCR_TE);
-}
-
-static void dmae_init(struct sh_dmae_chan *sh_chan)
-{
- /*
- * Default configuration for dual address memory-memory transfer.
- * 0x400 represents auto-request.
- */
- u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
- LOG2_DEFAULT_XFER_SIZE);
- sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
- chcr_write(sh_chan, chcr);
-}
-
-static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
-{
- /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */
- if (dmae_is_busy(sh_chan))
- return -EBUSY;
-
- sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
- chcr_write(sh_chan, val);
-
- return 0;
-}
-
-static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- const struct sh_dmae_pdata *pdata = shdev->pdata;
- const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id];
- void __iomem *addr = shdev->dmars;
- unsigned int shift = chan_pdata->dmars_bit;
-
- if (dmae_is_busy(sh_chan))
- return -EBUSY;
-
- if (pdata->no_dmars)
- return 0;
-
- /* in the case of a missing DMARS resource use first memory window */
- if (!addr)
- addr = shdev->chan_reg;
- addr += chan_pdata->dmars;
-
- __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
- addr);
-
- return 0;
-}
-
-static void sh_dmae_start_xfer(struct shdma_chan *schan,
- struct shdma_desc *sdesc)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
- shdma_chan);
- struct sh_dmae_desc *sh_desc = container_of(sdesc,
- struct sh_dmae_desc, shdma_desc);
- dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n",
- sdesc->async_tx.cookie, sh_chan->shdma_chan.id,
- sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar);
- /* Get the ld start address from ld_queue */
- dmae_set_reg(sh_chan, &sh_desc->hw);
- dmae_start(sh_chan);
-}
-
-static bool sh_dmae_channel_busy(struct shdma_chan *schan)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
- shdma_chan);
- return dmae_is_busy(sh_chan);
-}
-
-static void sh_dmae_setup_xfer(struct shdma_chan *schan,
- int slave_id)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
- shdma_chan);
-
- if (slave_id >= 0) {
- const struct sh_dmae_slave_config *cfg =
- sh_chan->config;
-
- dmae_set_dmars(sh_chan, cfg->mid_rid);
- dmae_set_chcr(sh_chan, cfg->chcr);
- } else {
- dmae_init(sh_chan);
- }
-}
-
-/*
- * Find a slave channel configuration from the contoller list by either a slave
- * ID in the non-DT case, or by a MID/RID value in the DT case
- */
-static const struct sh_dmae_slave_config *dmae_find_slave(
- struct sh_dmae_chan *sh_chan, int match)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- const struct sh_dmae_pdata *pdata = shdev->pdata;
- const struct sh_dmae_slave_config *cfg;
- int i;
-
- if (!sh_chan->shdma_chan.dev->of_node) {
- if (match >= SH_DMA_SLAVE_NUMBER)
- return NULL;
-
- for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
- if (cfg->slave_id == match)
- return cfg;
- } else {
- for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
- if (cfg->mid_rid == match) {
- sh_chan->shdma_chan.slave_id = cfg->slave_id;
- return cfg;
- }
- }
-
- return NULL;
-}
-
-static int sh_dmae_set_slave(struct shdma_chan *schan,
- int slave_id, bool try)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
- shdma_chan);
- const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id);
- if (!cfg)
- return -ENXIO;
-
- if (!try)
- sh_chan->config = cfg;
-
- return 0;
-}
-
-static void dmae_halt(struct sh_dmae_chan *sh_chan)
-{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- u32 chcr = chcr_read(sh_chan);
-
- chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
- chcr_write(sh_chan, chcr);
-}
-
-static int sh_dmae_desc_setup(struct shdma_chan *schan,
- struct shdma_desc *sdesc,
- dma_addr_t src, dma_addr_t dst, size_t *len)
-{
- struct sh_dmae_desc *sh_desc = container_of(sdesc,
- struct sh_dmae_desc, shdma_desc);
-
- if (*len > schan->max_xfer_len)
- *len = schan->max_xfer_len;
-
- sh_desc->hw.sar = src;
- sh_desc->hw.dar = dst;
- sh_desc->hw.tcr = *len;
-
- return 0;
-}
-
-static void sh_dmae_halt(struct shdma_chan *schan)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
- shdma_chan);
- dmae_halt(sh_chan);
-}
-
-static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
- shdma_chan);
-
- if (!(chcr_read(sh_chan) & CHCR_TE))
- return false;
-
- /* DMA stop */
- dmae_halt(sh_chan);
-
- return true;
-}
-
-static size_t sh_dmae_get_partial(struct shdma_chan *schan,
- struct shdma_desc *sdesc)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
- shdma_chan);
- struct sh_dmae_desc *sh_desc = container_of(sdesc,
- struct sh_dmae_desc, shdma_desc);
- return (sh_desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
- sh_chan->xmit_shift;
-}
-
-/* Called from error IRQ or NMI */
-static bool sh_dmae_reset(struct sh_dmae_device *shdev)
-{
- bool ret;
-
- /* halt the dma controller */
- sh_dmae_ctl_stop(shdev);
-
- /* We cannot detect, which channel caused the error, have to reset all */
- ret = shdma_reset(&shdev->shdma_dev);
-
- sh_dmae_rst(shdev);
-
- return ret;
-}
-
-static irqreturn_t sh_dmae_err(int irq, void *data)
-{
- struct sh_dmae_device *shdev = data;
-
- if (!(dmaor_read(shdev) & DMAOR_AE))
- return IRQ_NONE;
-
- sh_dmae_reset(shdev);
- return IRQ_HANDLED;
-}
-
-static bool sh_dmae_desc_completed(struct shdma_chan *schan,
- struct shdma_desc *sdesc)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan,
- struct sh_dmae_chan, shdma_chan);
- struct sh_dmae_desc *sh_desc = container_of(sdesc,
- struct sh_dmae_desc, shdma_desc);
- u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
- u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
-
- return (sdesc->direction == DMA_DEV_TO_MEM &&
- (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) ||
- (sdesc->direction != DMA_DEV_TO_MEM &&
- (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf);
-}
-
-static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
-{
- /* Fast path out if NMIF is not asserted for this controller */
- if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
- return false;
-
- return sh_dmae_reset(shdev);
-}
-
-static int sh_dmae_nmi_handler(struct notifier_block *self,
- unsigned long cmd, void *data)
-{
- struct sh_dmae_device *shdev;
- int ret = NOTIFY_DONE;
- bool triggered;
-
- /*
- * Only concern ourselves with NMI events.
- *
- * Normally we would check the die chain value, but as this needs
- * to be architecture independent, check for NMI context instead.
- */
- if (!in_nmi())
- return NOTIFY_DONE;
-
- rcu_read_lock();
- list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
- /*
- * Only stop if one of the controllers has NMIF asserted,
- * we do not want to interfere with regular address error
- * handling or NMI events that don't concern the DMACs.
- */
- triggered = sh_dmae_nmi_notify(shdev);
- if (triggered == true)
- ret = NOTIFY_OK;
- }
- rcu_read_unlock();
-
- return ret;
-}
-
-static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
- .notifier_call = sh_dmae_nmi_handler,
-
- /* Run before NMI debug handler and KGDB */
- .priority = 1,
-};
-
-static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
- int irq, unsigned long flags)
-{
- const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
- struct shdma_dev *sdev = &shdev->shdma_dev;
- struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev);
- struct sh_dmae_chan *sh_chan;
- struct shdma_chan *schan;
- int err;
-
- sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan),
- GFP_KERNEL);
- if (!sh_chan) {
- dev_err(sdev->dma_dev.dev,
- "No free memory for allocating dma channels!\n");
- return -ENOMEM;
- }
-
- schan = &sh_chan->shdma_chan;
- schan->max_xfer_len = SH_DMA_TCR_MAX + 1;
-
- shdma_chan_probe(sdev, schan, id);
-
- sh_chan->base = shdev->chan_reg + chan_pdata->offset;
-
- /* set up channel irq */
- if (pdev->id >= 0)
- snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
- "sh-dmae%d.%d", pdev->id, id);
- else
- snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
- "sh-dma%d", id);
-
- err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id);
- if (err) {
- dev_err(sdev->dma_dev.dev,
- "DMA channel %d request_irq error %d\n",
- id, err);
- goto err_no_irq;
- }
-
- shdev->chan[id] = sh_chan;
- return 0;
-
-err_no_irq:
- /* remove from dmaengine device node */
- shdma_chan_remove(schan);
- return err;
-}
-
-static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
-{
- struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
- struct shdma_chan *schan;
- int i;
-
- shdma_for_each_chan(schan, &shdev->shdma_dev, i) {
- BUG_ON(!schan);
-
- shdma_chan_remove(schan);
- }
- dma_dev->chancnt = 0;
-}
-
-static void sh_dmae_shutdown(struct platform_device *pdev)
-{
- struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
- sh_dmae_ctl_stop(shdev);
-}
-
-static int sh_dmae_runtime_suspend(struct device *dev)
-{
- return 0;
-}
-
-static int sh_dmae_runtime_resume(struct device *dev)
-{
- struct sh_dmae_device *shdev = dev_get_drvdata(dev);
-
- return sh_dmae_rst(shdev);
-}
-
-#ifdef CONFIG_PM
-static int sh_dmae_suspend(struct device *dev)
-{
- return 0;
-}
-
-static int sh_dmae_resume(struct device *dev)
-{
- struct sh_dmae_device *shdev = dev_get_drvdata(dev);
- int i, ret;
-
- ret = sh_dmae_rst(shdev);
- if (ret < 0)
- dev_err(dev, "Failed to reset!\n");
-
- for (i = 0; i < shdev->pdata->channel_num; i++) {
- struct sh_dmae_chan *sh_chan = shdev->chan[i];
-
- if (!sh_chan->shdma_chan.desc_num)
- continue;
-
- if (sh_chan->shdma_chan.slave_id >= 0) {
- const struct sh_dmae_slave_config *cfg = sh_chan->config;
- dmae_set_dmars(sh_chan, cfg->mid_rid);
- dmae_set_chcr(sh_chan, cfg->chcr);
- } else {
- dmae_init(sh_chan);
- }
- }
-
- return 0;
-}
-#else
-#define sh_dmae_suspend NULL
-#define sh_dmae_resume NULL
-#endif
-
-const struct dev_pm_ops sh_dmae_pm = {
- .suspend = sh_dmae_suspend,
- .resume = sh_dmae_resume,
- .runtime_suspend = sh_dmae_runtime_suspend,
- .runtime_resume = sh_dmae_runtime_resume,
-};
-
-static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan)
-{
- struct sh_dmae_chan *sh_chan = container_of(schan,
- struct sh_dmae_chan, shdma_chan);
-
- /*
- * Implicit BUG_ON(!sh_chan->config)
- * This is an exclusive slave DMA operation, may only be called after a
- * successful slave configuration.
- */
- return sh_chan->config->addr;
-}
-
-static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i)
-{
- return &((struct sh_dmae_desc *)buf)[i].shdma_desc;
-}
-
-static const struct shdma_ops sh_dmae_shdma_ops = {
- .desc_completed = sh_dmae_desc_completed,
- .halt_channel = sh_dmae_halt,
- .channel_busy = sh_dmae_channel_busy,
- .slave_addr = sh_dmae_slave_addr,
- .desc_setup = sh_dmae_desc_setup,
- .set_slave = sh_dmae_set_slave,
- .setup_xfer = sh_dmae_setup_xfer,
- .start_xfer = sh_dmae_start_xfer,
- .embedded_desc = sh_dmae_embedded_desc,
- .chan_irq = sh_dmae_chan_irq,
- .get_partial = sh_dmae_get_partial,
-};
-
-static int sh_dmae_probe(struct platform_device *pdev)
-{
- const struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
- unsigned long irqflags = IRQF_DISABLED,
- chan_flag[SH_DMAE_MAX_CHANNELS] = {};
- int errirq, chan_irq[SH_DMAE_MAX_CHANNELS];
- int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
- struct sh_dmae_device *shdev;
- struct dma_device *dma_dev;
- struct resource *chan, *dmars, *errirq_res, *chanirq_res;
-
- /* get platform data */
- if (!pdata || !pdata->channel_num)
- return -ENODEV;
-
- chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- /* DMARS area is optional */
- dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- /*
- * IRQ resources:
- * 1. there always must be at least one IRQ IO-resource. On SH4 it is
- * the error IRQ, in which case it is the only IRQ in this resource:
- * start == end. If it is the only IRQ resource, all channels also
- * use the same IRQ.
- * 2. DMA channel IRQ resources can be specified one per resource or in
- * ranges (start != end)
- * 3. iff all events (channels and, optionally, error) on this
- * controller use the same IRQ, only one IRQ resource can be
- * specified, otherwise there must be one IRQ per channel, even if
- * some of them are equal
- * 4. if all IRQs on this controller are equal or if some specific IRQs
- * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
- * requested with the IRQF_SHARED flag
- */
- errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (!chan || !errirq_res)
- return -ENODEV;
-
- shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device),
- GFP_KERNEL);
- if (!shdev) {
- dev_err(&pdev->dev, "Not enough memory\n");
- return -ENOMEM;
- }
-
- dma_dev = &shdev->shdma_dev.dma_dev;
-
- shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan);
- if (IS_ERR(shdev->chan_reg))
- return PTR_ERR(shdev->chan_reg);
- if (dmars) {
- shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars);
- if (IS_ERR(shdev->dmars))
- return PTR_ERR(shdev->dmars);
- }
-
- if (!pdata->slave_only)
- dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
- if (pdata->slave && pdata->slave_num)
- dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
-
- /* Default transfer size of 32 bytes requires 32-byte alignment */
- dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
-
- shdev->shdma_dev.ops = &sh_dmae_shdma_ops;
- shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc);
- err = shdma_init(&pdev->dev, &shdev->shdma_dev,
- pdata->channel_num);
- if (err < 0)
- goto eshdma;
-
- /* platform data */
- shdev->pdata = pdata;
-
- if (pdata->chcr_offset)
- shdev->chcr_offset = pdata->chcr_offset;
- else
- shdev->chcr_offset = CHCR;
-
- if (pdata->chcr_ie_bit)
- shdev->chcr_ie_bit = pdata->chcr_ie_bit;
- else
- shdev->chcr_ie_bit = CHCR_IE;
-
- platform_set_drvdata(pdev, shdev);
-
- pm_runtime_enable(&pdev->dev);
- err = pm_runtime_get_sync(&pdev->dev);
- if (err < 0)
- dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err);
-
- spin_lock_irq(&sh_dmae_lock);
- list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
- spin_unlock_irq(&sh_dmae_lock);
-
- /* reset dma controller - only needed as a test */
- err = sh_dmae_rst(shdev);
- if (err)
- goto rst_err;
-
-#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
- chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
-
- if (!chanirq_res)
- chanirq_res = errirq_res;
- else
- irqres++;
-
- if (chanirq_res == errirq_res ||
- (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
- irqflags = IRQF_SHARED;
-
- errirq = errirq_res->start;
-
- err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags,
- "DMAC Address Error", shdev);
- if (err) {
- dev_err(&pdev->dev,
- "DMA failed requesting irq #%d, error %d\n",
- errirq, err);
- goto eirq_err;
- }
-
-#else
- chanirq_res = errirq_res;
-#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
-
- if (chanirq_res->start == chanirq_res->end &&
- !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
- /* Special case - all multiplexed */
- for (; irq_cnt < pdata->channel_num; irq_cnt++) {
- if (irq_cnt < SH_DMAE_MAX_CHANNELS) {
- chan_irq[irq_cnt] = chanirq_res->start;
- chan_flag[irq_cnt] = IRQF_SHARED;
- } else {
- irq_cap = 1;
- break;
- }
- }
- } else {
- do {
- for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
- if (irq_cnt >= SH_DMAE_MAX_CHANNELS) {
- irq_cap = 1;
- break;
- }
-
- if ((errirq_res->flags & IORESOURCE_BITS) ==
- IORESOURCE_IRQ_SHAREABLE)
- chan_flag[irq_cnt] = IRQF_SHARED;
- else
- chan_flag[irq_cnt] = IRQF_DISABLED;
- dev_dbg(&pdev->dev,
- "Found IRQ %d for channel %d\n",
- i, irq_cnt);
- chan_irq[irq_cnt++] = i;
- }
-
- if (irq_cnt >= SH_DMAE_MAX_CHANNELS)
- break;
-
- chanirq_res = platform_get_resource(pdev,
- IORESOURCE_IRQ, ++irqres);
- } while (irq_cnt < pdata->channel_num && chanirq_res);
- }
-
- /* Create DMA Channel */
- for (i = 0; i < irq_cnt; i++) {
- err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
- if (err)
- goto chan_probe_err;
- }
-
- if (irq_cap)
- dev_notice(&pdev->dev, "Attempting to register %d DMA "
- "channels when a maximum of %d are supported.\n",
- pdata->channel_num, SH_DMAE_MAX_CHANNELS);
-
- pm_runtime_put(&pdev->dev);
-
- err = dma_async_device_register(&shdev->shdma_dev.dma_dev);
- if (err < 0)
- goto edmadevreg;
-
- return err;
-
-edmadevreg:
- pm_runtime_get(&pdev->dev);
-
-chan_probe_err:
- sh_dmae_chan_remove(shdev);
-
-#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
-eirq_err:
-#endif
-rst_err:
- spin_lock_irq(&sh_dmae_lock);
- list_del_rcu(&shdev->node);
- spin_unlock_irq(&sh_dmae_lock);
-
- pm_runtime_put(&pdev->dev);
- pm_runtime_disable(&pdev->dev);
-
- platform_set_drvdata(pdev, NULL);
- shdma_cleanup(&shdev->shdma_dev);
-eshdma:
- synchronize_rcu();
-
- return err;
-}
-
-static int sh_dmae_remove(struct platform_device *pdev)
-{
- struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
- struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
- struct resource *res;
- int errirq = platform_get_irq(pdev, 0);
-
- dma_async_device_unregister(dma_dev);
-
- if (errirq > 0)
- free_irq(errirq, shdev);
-
- spin_lock_irq(&sh_dmae_lock);
- list_del_rcu(&shdev->node);
- spin_unlock_irq(&sh_dmae_lock);
-
- pm_runtime_disable(&pdev->dev);
-
- sh_dmae_chan_remove(shdev);
- shdma_cleanup(&shdev->shdma_dev);
-
- platform_set_drvdata(pdev, NULL);
-
- synchronize_rcu();
-
- return 0;
-}
-
-static const struct of_device_id sh_dmae_of_match[] = {
- { .compatible = "renesas,shdma", },
- { }
-};
-MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
-
-static struct platform_driver sh_dmae_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .pm = &sh_dmae_pm,
- .name = SH_DMAE_DRV_NAME,
- .of_match_table = sh_dmae_of_match,
- },
- .remove = sh_dmae_remove,
- .shutdown = sh_dmae_shutdown,
-};
-
-static int __init sh_dmae_init(void)
-{
- /* Wire up NMI handling */
- int err = register_die_notifier(&sh_dmae_nmi_notifier);
- if (err)
- return err;
-
- 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);
-
- unregister_die_notifier(&sh_dmae_nmi_notifier);
-}
-module_exit(sh_dmae_exit);
-
-MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
-MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME);
void __iomem *base;
char dev_id[16]; /* unique name per DMAC of channel */
int pm_error;
+ dma_addr_t slave_addr;
};
struct sh_dmae_device {
--- /dev/null
+/*
+ * Renesas SuperH DMA Engine support
+ *
+ * base is drivers/dma/flsdma.c
+ *
+ * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
+ * 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/of.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/sh_dma.h>
+#include <linux/notifier.h>
+#include <linux/kdebug.h>
+#include <linux/spinlock.h>
+#include <linux/rculist.h>
+
+#include "../dmaengine.h"
+#include "shdma.h"
+
+#define SH_DMAE_DRV_NAME "sh-dma-engine"
+
+/* Default MEMCPY transfer size = 2^2 = 4 bytes */
+#define LOG2_DEFAULT_XFER_SIZE 2
+#define SH_DMA_SLAVE_NUMBER 256
+#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1)
+
+/*
+ * Used for write-side mutual exclusion for the global device list,
+ * read-side synchronization by way of RCU, and per-controller data.
+ */
+static DEFINE_SPINLOCK(sh_dmae_lock);
+static LIST_HEAD(sh_dmae_devices);
+
+/*
+ * Different DMAC implementations provide different ways to clear DMA channels:
+ * (1) none - no CHCLR registers are available
+ * (2) one CHCLR register per channel - 0 has to be written to it to clear
+ * channel buffers
+ * (3) one CHCLR per several channels - 1 has to be written to the bit,
+ * corresponding to the specific channel to reset it
+ */
+static void channel_clear(struct sh_dmae_chan *sh_dc)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+ const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel +
+ sh_dc->shdma_chan.id;
+ u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0;
+
+ __raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset);
+}
+
+static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
+{
+ __raw_writel(data, sh_dc->base + reg);
+}
+
+static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
+{
+ return __raw_readl(sh_dc->base + reg);
+}
+
+static u16 dmaor_read(struct sh_dmae_device *shdev)
+{
+ void __iomem *addr = shdev->chan_reg + DMAOR;
+
+ if (shdev->pdata->dmaor_is_32bit)
+ return __raw_readl(addr);
+ else
+ return __raw_readw(addr);
+}
+
+static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
+{
+ void __iomem *addr = shdev->chan_reg + DMAOR;
+
+ if (shdev->pdata->dmaor_is_32bit)
+ __raw_writel(data, addr);
+ else
+ __raw_writew(data, addr);
+}
+
+static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+
+ __raw_writel(data, sh_dc->base + shdev->chcr_offset);
+}
+
+static u32 chcr_read(struct sh_dmae_chan *sh_dc)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+
+ return __raw_readl(sh_dc->base + shdev->chcr_offset);
+}
+
+/*
+ * Reset DMA controller
+ *
+ * SH7780 has two DMAOR register
+ */
+static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
+{
+ unsigned short dmaor;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sh_dmae_lock, flags);
+
+ dmaor = dmaor_read(shdev);
+ dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
+
+ spin_unlock_irqrestore(&sh_dmae_lock, flags);
+}
+
+static int sh_dmae_rst(struct sh_dmae_device *shdev)
+{
+ unsigned short dmaor;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sh_dmae_lock, flags);
+
+ dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
+
+ if (shdev->pdata->chclr_present) {
+ int i;
+ for (i = 0; i < shdev->pdata->channel_num; i++) {
+ struct sh_dmae_chan *sh_chan = shdev->chan[i];
+ if (sh_chan)
+ channel_clear(sh_chan);
+ }
+ }
+
+ dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init);
+
+ dmaor = dmaor_read(shdev);
+
+ spin_unlock_irqrestore(&sh_dmae_lock, flags);
+
+ if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
+ dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n");
+ return -EIO;
+ }
+ if (shdev->pdata->dmaor_init & ~dmaor)
+ dev_warn(shdev->shdma_dev.dma_dev.dev,
+ "DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
+ dmaor, shdev->pdata->dmaor_init);
+ return 0;
+}
+
+static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
+{
+ u32 chcr = chcr_read(sh_chan);
+
+ if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
+ return true; /* working */
+
+ return false; /* waiting */
+}
+
+static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ const struct sh_dmae_pdata *pdata = shdev->pdata;
+ int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
+ ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
+
+ if (cnt >= pdata->ts_shift_num)
+ cnt = 0;
+
+ return pdata->ts_shift[cnt];
+}
+
+static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ const struct sh_dmae_pdata *pdata = shdev->pdata;
+ int i;
+
+ for (i = 0; i < pdata->ts_shift_num; i++)
+ if (pdata->ts_shift[i] == l2size)
+ break;
+
+ if (i == pdata->ts_shift_num)
+ i = 0;
+
+ return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
+ ((i << pdata->ts_high_shift) & pdata->ts_high_mask);
+}
+
+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 >> sh_chan->xmit_shift, TCR);
+}
+
+static void dmae_start(struct sh_dmae_chan *sh_chan)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ u32 chcr = chcr_read(sh_chan);
+
+ if (shdev->pdata->needs_tend_set)
+ sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND);
+
+ chcr |= CHCR_DE | shdev->chcr_ie_bit;
+ chcr_write(sh_chan, chcr & ~CHCR_TE);
+}
+
+static void dmae_init(struct sh_dmae_chan *sh_chan)
+{
+ /*
+ * Default configuration for dual address memory-memory transfer.
+ * 0x400 represents auto-request.
+ */
+ u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
+ LOG2_DEFAULT_XFER_SIZE);
+ sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
+ chcr_write(sh_chan, chcr);
+}
+
+static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
+{
+ /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */
+ if (dmae_is_busy(sh_chan))
+ return -EBUSY;
+
+ sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
+ chcr_write(sh_chan, val);
+
+ return 0;
+}
+
+static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ const struct sh_dmae_pdata *pdata = shdev->pdata;
+ const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id];
+ void __iomem *addr = shdev->dmars;
+ unsigned int shift = chan_pdata->dmars_bit;
+
+ if (dmae_is_busy(sh_chan))
+ return -EBUSY;
+
+ if (pdata->no_dmars)
+ return 0;
+
+ /* in the case of a missing DMARS resource use first memory window */
+ if (!addr)
+ addr = shdev->chan_reg;
+ addr += chan_pdata->dmars;
+
+ __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
+ addr);
+
+ return 0;
+}
+
+static void sh_dmae_start_xfer(struct shdma_chan *schan,
+ struct shdma_desc *sdesc)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, shdma_desc);
+ dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n",
+ sdesc->async_tx.cookie, sh_chan->shdma_chan.id,
+ sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar);
+ /* Get the ld start address from ld_queue */
+ dmae_set_reg(sh_chan, &sh_desc->hw);
+ dmae_start(sh_chan);
+}
+
+static bool sh_dmae_channel_busy(struct shdma_chan *schan)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ return dmae_is_busy(sh_chan);
+}
+
+static void sh_dmae_setup_xfer(struct shdma_chan *schan,
+ int slave_id)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+
+ if (slave_id >= 0) {
+ const struct sh_dmae_slave_config *cfg =
+ sh_chan->config;
+
+ dmae_set_dmars(sh_chan, cfg->mid_rid);
+ dmae_set_chcr(sh_chan, cfg->chcr);
+ } else {
+ dmae_init(sh_chan);
+ }
+}
+
+/*
+ * Find a slave channel configuration from the contoller list by either a slave
+ * ID in the non-DT case, or by a MID/RID value in the DT case
+ */
+static const struct sh_dmae_slave_config *dmae_find_slave(
+ struct sh_dmae_chan *sh_chan, int match)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ const struct sh_dmae_pdata *pdata = shdev->pdata;
+ const struct sh_dmae_slave_config *cfg;
+ int i;
+
+ if (!sh_chan->shdma_chan.dev->of_node) {
+ if (match >= SH_DMA_SLAVE_NUMBER)
+ return NULL;
+
+ for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
+ if (cfg->slave_id == match)
+ return cfg;
+ } else {
+ for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
+ if (cfg->mid_rid == match) {
+ sh_chan->shdma_chan.slave_id = i;
+ return cfg;
+ }
+ }
+
+ return NULL;
+}
+
+static int sh_dmae_set_slave(struct shdma_chan *schan,
+ int slave_id, dma_addr_t slave_addr, bool try)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id);
+ if (!cfg)
+ return -ENXIO;
+
+ if (!try) {
+ sh_chan->config = cfg;
+ sh_chan->slave_addr = slave_addr ? : cfg->addr;
+ }
+
+ return 0;
+}
+
+static void dmae_halt(struct sh_dmae_chan *sh_chan)
+{
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ u32 chcr = chcr_read(sh_chan);
+
+ chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
+ chcr_write(sh_chan, chcr);
+}
+
+static int sh_dmae_desc_setup(struct shdma_chan *schan,
+ struct shdma_desc *sdesc,
+ dma_addr_t src, dma_addr_t dst, size_t *len)
+{
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, shdma_desc);
+
+ if (*len > schan->max_xfer_len)
+ *len = schan->max_xfer_len;
+
+ sh_desc->hw.sar = src;
+ sh_desc->hw.dar = dst;
+ sh_desc->hw.tcr = *len;
+
+ return 0;
+}
+
+static void sh_dmae_halt(struct shdma_chan *schan)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ dmae_halt(sh_chan);
+}
+
+static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+
+ if (!(chcr_read(sh_chan) & CHCR_TE))
+ return false;
+
+ /* DMA stop */
+ dmae_halt(sh_chan);
+
+ return true;
+}
+
+static size_t sh_dmae_get_partial(struct shdma_chan *schan,
+ struct shdma_desc *sdesc)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, shdma_desc);
+ return (sh_desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
+ sh_chan->xmit_shift;
+}
+
+/* Called from error IRQ or NMI */
+static bool sh_dmae_reset(struct sh_dmae_device *shdev)
+{
+ bool ret;
+
+ /* halt the dma controller */
+ sh_dmae_ctl_stop(shdev);
+
+ /* We cannot detect, which channel caused the error, have to reset all */
+ ret = shdma_reset(&shdev->shdma_dev);
+
+ sh_dmae_rst(shdev);
+
+ return ret;
+}
+
+static irqreturn_t sh_dmae_err(int irq, void *data)
+{
+ struct sh_dmae_device *shdev = data;
+
+ if (!(dmaor_read(shdev) & DMAOR_AE))
+ return IRQ_NONE;
+
+ sh_dmae_reset(shdev);
+ return IRQ_HANDLED;
+}
+
+static bool sh_dmae_desc_completed(struct shdma_chan *schan,
+ struct shdma_desc *sdesc)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan,
+ struct sh_dmae_chan, shdma_chan);
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, shdma_desc);
+ u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
+ u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
+
+ return (sdesc->direction == DMA_DEV_TO_MEM &&
+ (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) ||
+ (sdesc->direction != DMA_DEV_TO_MEM &&
+ (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf);
+}
+
+static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
+{
+ /* Fast path out if NMIF is not asserted for this controller */
+ if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
+ return false;
+
+ return sh_dmae_reset(shdev);
+}
+
+static int sh_dmae_nmi_handler(struct notifier_block *self,
+ unsigned long cmd, void *data)
+{
+ struct sh_dmae_device *shdev;
+ int ret = NOTIFY_DONE;
+ bool triggered;
+
+ /*
+ * Only concern ourselves with NMI events.
+ *
+ * Normally we would check the die chain value, but as this needs
+ * to be architecture independent, check for NMI context instead.
+ */
+ if (!in_nmi())
+ return NOTIFY_DONE;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
+ /*
+ * Only stop if one of the controllers has NMIF asserted,
+ * we do not want to interfere with regular address error
+ * handling or NMI events that don't concern the DMACs.
+ */
+ triggered = sh_dmae_nmi_notify(shdev);
+ if (triggered == true)
+ ret = NOTIFY_OK;
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
+static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
+ .notifier_call = sh_dmae_nmi_handler,
+
+ /* Run before NMI debug handler and KGDB */
+ .priority = 1,
+};
+
+static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
+ int irq, unsigned long flags)
+{
+ const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
+ struct shdma_dev *sdev = &shdev->shdma_dev;
+ struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev);
+ struct sh_dmae_chan *sh_chan;
+ struct shdma_chan *schan;
+ int err;
+
+ sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan),
+ GFP_KERNEL);
+ if (!sh_chan) {
+ dev_err(sdev->dma_dev.dev,
+ "No free memory for allocating dma channels!\n");
+ return -ENOMEM;
+ }
+
+ schan = &sh_chan->shdma_chan;
+ schan->max_xfer_len = SH_DMA_TCR_MAX + 1;
+
+ shdma_chan_probe(sdev, schan, id);
+
+ sh_chan->base = shdev->chan_reg + chan_pdata->offset;
+
+ /* set up channel irq */
+ if (pdev->id >= 0)
+ snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
+ "sh-dmae%d.%d", pdev->id, id);
+ else
+ snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
+ "sh-dma%d", id);
+
+ err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id);
+ if (err) {
+ dev_err(sdev->dma_dev.dev,
+ "DMA channel %d request_irq error %d\n",
+ id, err);
+ goto err_no_irq;
+ }
+
+ shdev->chan[id] = sh_chan;
+ return 0;
+
+err_no_irq:
+ /* remove from dmaengine device node */
+ shdma_chan_remove(schan);
+ return err;
+}
+
+static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
+{
+ struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
+ struct shdma_chan *schan;
+ int i;
+
+ shdma_for_each_chan(schan, &shdev->shdma_dev, i) {
+ BUG_ON(!schan);
+
+ shdma_chan_remove(schan);
+ }
+ dma_dev->chancnt = 0;
+}
+
+static void sh_dmae_shutdown(struct platform_device *pdev)
+{
+ struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
+ sh_dmae_ctl_stop(shdev);
+}
+
+static int sh_dmae_runtime_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int sh_dmae_runtime_resume(struct device *dev)
+{
+ struct sh_dmae_device *shdev = dev_get_drvdata(dev);
+
+ return sh_dmae_rst(shdev);
+}
+
+#ifdef CONFIG_PM
+static int sh_dmae_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int sh_dmae_resume(struct device *dev)
+{
+ struct sh_dmae_device *shdev = dev_get_drvdata(dev);
+ int i, ret;
+
+ ret = sh_dmae_rst(shdev);
+ if (ret < 0)
+ dev_err(dev, "Failed to reset!\n");
+
+ for (i = 0; i < shdev->pdata->channel_num; i++) {
+ struct sh_dmae_chan *sh_chan = shdev->chan[i];
+
+ if (!sh_chan->shdma_chan.desc_num)
+ continue;
+
+ if (sh_chan->shdma_chan.slave_id >= 0) {
+ const struct sh_dmae_slave_config *cfg = sh_chan->config;
+ dmae_set_dmars(sh_chan, cfg->mid_rid);
+ dmae_set_chcr(sh_chan, cfg->chcr);
+ } else {
+ dmae_init(sh_chan);
+ }
+ }
+
+ return 0;
+}
+#else
+#define sh_dmae_suspend NULL
+#define sh_dmae_resume NULL
+#endif
+
+const struct dev_pm_ops sh_dmae_pm = {
+ .suspend = sh_dmae_suspend,
+ .resume = sh_dmae_resume,
+ .runtime_suspend = sh_dmae_runtime_suspend,
+ .runtime_resume = sh_dmae_runtime_resume,
+};
+
+static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan,
+ struct sh_dmae_chan, shdma_chan);
+
+ /*
+ * Implicit BUG_ON(!sh_chan->config)
+ * This is an exclusive slave DMA operation, may only be called after a
+ * successful slave configuration.
+ */
+ return sh_chan->slave_addr;
+}
+
+static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i)
+{
+ return &((struct sh_dmae_desc *)buf)[i].shdma_desc;
+}
+
+static const struct shdma_ops sh_dmae_shdma_ops = {
+ .desc_completed = sh_dmae_desc_completed,
+ .halt_channel = sh_dmae_halt,
+ .channel_busy = sh_dmae_channel_busy,
+ .slave_addr = sh_dmae_slave_addr,
+ .desc_setup = sh_dmae_desc_setup,
+ .set_slave = sh_dmae_set_slave,
+ .setup_xfer = sh_dmae_setup_xfer,
+ .start_xfer = sh_dmae_start_xfer,
+ .embedded_desc = sh_dmae_embedded_desc,
+ .chan_irq = sh_dmae_chan_irq,
+ .get_partial = sh_dmae_get_partial,
+};
+
+static const struct of_device_id sh_dmae_of_match[] = {
+ {}
+};
+MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
+
+static int sh_dmae_probe(struct platform_device *pdev)
+{
+ const struct sh_dmae_pdata *pdata;
+ unsigned long irqflags = IRQF_DISABLED,
+ chan_flag[SH_DMAE_MAX_CHANNELS] = {};
+ int errirq, chan_irq[SH_DMAE_MAX_CHANNELS];
+ int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
+ struct sh_dmae_device *shdev;
+ struct dma_device *dma_dev;
+ struct resource *chan, *dmars, *errirq_res, *chanirq_res;
+
+ if (pdev->dev.of_node)
+ pdata = of_match_device(sh_dmae_of_match, &pdev->dev)->data;
+ else
+ pdata = pdev->dev.platform_data;
+
+ /* get platform data */
+ if (!pdata || !pdata->channel_num)
+ return -ENODEV;
+
+ chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ /* DMARS area is optional */
+ dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ /*
+ * IRQ resources:
+ * 1. there always must be at least one IRQ IO-resource. On SH4 it is
+ * the error IRQ, in which case it is the only IRQ in this resource:
+ * start == end. If it is the only IRQ resource, all channels also
+ * use the same IRQ.
+ * 2. DMA channel IRQ resources can be specified one per resource or in
+ * ranges (start != end)
+ * 3. iff all events (channels and, optionally, error) on this
+ * controller use the same IRQ, only one IRQ resource can be
+ * specified, otherwise there must be one IRQ per channel, even if
+ * some of them are equal
+ * 4. if all IRQs on this controller are equal or if some specific IRQs
+ * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
+ * requested with the IRQF_SHARED flag
+ */
+ errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!chan || !errirq_res)
+ return -ENODEV;
+
+ shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device),
+ GFP_KERNEL);
+ if (!shdev) {
+ dev_err(&pdev->dev, "Not enough memory\n");
+ return -ENOMEM;
+ }
+
+ dma_dev = &shdev->shdma_dev.dma_dev;
+
+ shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan);
+ if (IS_ERR(shdev->chan_reg))
+ return PTR_ERR(shdev->chan_reg);
+ if (dmars) {
+ shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars);
+ if (IS_ERR(shdev->dmars))
+ return PTR_ERR(shdev->dmars);
+ }
+
+ if (!pdata->slave_only)
+ dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
+ if (pdata->slave && pdata->slave_num)
+ dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
+
+ /* Default transfer size of 32 bytes requires 32-byte alignment */
+ dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
+
+ shdev->shdma_dev.ops = &sh_dmae_shdma_ops;
+ shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc);
+ err = shdma_init(&pdev->dev, &shdev->shdma_dev,
+ pdata->channel_num);
+ if (err < 0)
+ goto eshdma;
+
+ /* platform data */
+ shdev->pdata = pdata;
+
+ if (pdata->chcr_offset)
+ shdev->chcr_offset = pdata->chcr_offset;
+ else
+ shdev->chcr_offset = CHCR;
+
+ if (pdata->chcr_ie_bit)
+ shdev->chcr_ie_bit = pdata->chcr_ie_bit;
+ else
+ shdev->chcr_ie_bit = CHCR_IE;
+
+ platform_set_drvdata(pdev, shdev);
+
+ pm_runtime_enable(&pdev->dev);
+ err = pm_runtime_get_sync(&pdev->dev);
+ if (err < 0)
+ dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err);
+
+ spin_lock_irq(&sh_dmae_lock);
+ list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
+ spin_unlock_irq(&sh_dmae_lock);
+
+ /* reset dma controller - only needed as a test */
+ err = sh_dmae_rst(shdev);
+ if (err)
+ goto rst_err;
+
+#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
+ chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
+
+ if (!chanirq_res)
+ chanirq_res = errirq_res;
+ else
+ irqres++;
+
+ if (chanirq_res == errirq_res ||
+ (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
+ irqflags = IRQF_SHARED;
+
+ errirq = errirq_res->start;
+
+ err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags,
+ "DMAC Address Error", shdev);
+ if (err) {
+ dev_err(&pdev->dev,
+ "DMA failed requesting irq #%d, error %d\n",
+ errirq, err);
+ goto eirq_err;
+ }
+
+#else
+ chanirq_res = errirq_res;
+#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
+
+ if (chanirq_res->start == chanirq_res->end &&
+ !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
+ /* Special case - all multiplexed */
+ for (; irq_cnt < pdata->channel_num; irq_cnt++) {
+ if (irq_cnt < SH_DMAE_MAX_CHANNELS) {
+ chan_irq[irq_cnt] = chanirq_res->start;
+ chan_flag[irq_cnt] = IRQF_SHARED;
+ } else {
+ irq_cap = 1;
+ break;
+ }
+ }
+ } else {
+ do {
+ for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
+ if (irq_cnt >= SH_DMAE_MAX_CHANNELS) {
+ irq_cap = 1;
+ break;
+ }
+
+ if ((errirq_res->flags & IORESOURCE_BITS) ==
+ IORESOURCE_IRQ_SHAREABLE)
+ chan_flag[irq_cnt] = IRQF_SHARED;
+ else
+ chan_flag[irq_cnt] = IRQF_DISABLED;
+ dev_dbg(&pdev->dev,
+ "Found IRQ %d for channel %d\n",
+ i, irq_cnt);
+ chan_irq[irq_cnt++] = i;
+ }
+
+ if (irq_cnt >= SH_DMAE_MAX_CHANNELS)
+ break;
+
+ chanirq_res = platform_get_resource(pdev,
+ IORESOURCE_IRQ, ++irqres);
+ } while (irq_cnt < pdata->channel_num && chanirq_res);
+ }
+
+ /* Create DMA Channel */
+ for (i = 0; i < irq_cnt; i++) {
+ err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
+ if (err)
+ goto chan_probe_err;
+ }
+
+ if (irq_cap)
+ dev_notice(&pdev->dev, "Attempting to register %d DMA "
+ "channels when a maximum of %d are supported.\n",
+ pdata->channel_num, SH_DMAE_MAX_CHANNELS);
+
+ pm_runtime_put(&pdev->dev);
+
+ err = dma_async_device_register(&shdev->shdma_dev.dma_dev);
+ if (err < 0)
+ goto edmadevreg;
+
+ return err;
+
+edmadevreg:
+ pm_runtime_get(&pdev->dev);
+
+chan_probe_err:
+ sh_dmae_chan_remove(shdev);
+
+#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
+eirq_err:
+#endif
+rst_err:
+ spin_lock_irq(&sh_dmae_lock);
+ list_del_rcu(&shdev->node);
+ spin_unlock_irq(&sh_dmae_lock);
+
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ platform_set_drvdata(pdev, NULL);
+ shdma_cleanup(&shdev->shdma_dev);
+eshdma:
+ synchronize_rcu();
+
+ return err;
+}
+
+static int sh_dmae_remove(struct platform_device *pdev)
+{
+ struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
+ struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
+ struct resource *res;
+ int errirq = platform_get_irq(pdev, 0);
+
+ dma_async_device_unregister(dma_dev);
+
+ if (errirq > 0)
+ free_irq(errirq, shdev);
+
+ spin_lock_irq(&sh_dmae_lock);
+ list_del_rcu(&shdev->node);
+ spin_unlock_irq(&sh_dmae_lock);
+
+ pm_runtime_disable(&pdev->dev);
+
+ sh_dmae_chan_remove(shdev);
+ shdma_cleanup(&shdev->shdma_dev);
+
+ platform_set_drvdata(pdev, NULL);
+
+ synchronize_rcu();
+
+ return 0;
+}
+
+static struct platform_driver sh_dmae_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .pm = &sh_dmae_pm,
+ .name = SH_DMAE_DRV_NAME,
+ .of_match_table = sh_dmae_of_match,
+ },
+ .remove = sh_dmae_remove,
+ .shutdown = sh_dmae_shutdown,
+};
+
+static int __init sh_dmae_init(void)
+{
+ /* Wire up NMI handling */
+ int err = register_die_notifier(&sh_dmae_nmi_notifier);
+ if (err)
+ return err;
+
+ 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);
+
+ unregister_die_notifier(&sh_dmae_nmi_notifier);
+}
+module_exit(sh_dmae_exit);
+
+MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
+MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME);
return NULL;
}
-static int sudmac_set_slave(struct shdma_chan *schan, int slave_id, bool try)
+static int sudmac_set_slave(struct shdma_chan *schan, int slave_id,
+ dma_addr_t slave_addr, bool try)
{
struct sudmac_chan *sc = to_chan(schan);
const struct sudmac_slave_config *cfg = sudmac_find_slave(sc, slave_id);
dma_addr_t (*slave_addr)(struct shdma_chan *);
int (*desc_setup)(struct shdma_chan *, struct shdma_desc *,
dma_addr_t, dma_addr_t, size_t *);
- int (*set_slave)(struct shdma_chan *, int, bool);
+ int (*set_slave)(struct shdma_chan *, int, dma_addr_t, bool);
void (*setup_xfer)(struct shdma_chan *, int);
void (*start_xfer)(struct shdma_chan *, struct shdma_desc *);
struct shdma_desc *(*embedded_desc)(void *, int);
projects / linux.git / commitdiff