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Message-id: <OF8D49C605.99A1CBE3-ON80257B9B.003FC397-80257B9B.004368CF@eu.necel.com>
Date: Mon, 01 Jul 2013 13:16:13 +0100
From: phil.edworthy@...esas.com
To: Max Filippov <max.filippov@...entembedded.com>
Cc: djbw@...com, linux-kernel@...r.kernel.org,
linux-sh@...r.kernel.org, linux-sh-owner@...r.kernel.org,
vinod.koul@...el.com,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH] dma: add driver for R-Car HPB-DMAC
Hi Max, Sergei,
Thanks for your work on this.
> Add support for HPB-DMAC found in Renesas R-Car SoCs, using 'shdma-base'
DMA
> driver framework.
>
> Based on the original patch by Phil Edworthy
<phil.edworthy@...esas.com>.
>
> Signed-off-by: Max Filippov <max.filippov@...entembedded.com>
> [Sergei: removed useless #include, sorted #include's, fixed
HPB_DMA_TCR_MAX,
> fixed formats and removed line breaks in the dev_dbg() calls, rephrased
and
> added IRQ # to the shdma_request_irq() failure message, added
MODULE_AUTHOR(),
> fixed guard macro name in the header file, fixed #define
ASYNCRSTR_ASRST20,
> added #define ASYNCRSTR_ASRST24, beautified some commets.]
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
>
> ---
> The patch is against the 'next' branch of Vinod Koul's 'slave-dma.git'
repo.
>
> drivers/dma/sh/Kconfig | 6
> drivers/dma/sh/Makefile | 1
> drivers/dma/sh/rcar-hpbdma.c | 623
++++++++++++++++++++++++++
> include/linux/platform_data/dma-rcar-hpbdma.h | 103 ++++
> 4 files changed, 733 insertions(+)
> create mode 100644 drivers/dma/sh/rcar-hpbdma.c
> create mode 100644 include/linux/platform_data/dma-rcar-hpbdma.h
>
> Index: slave-dma/drivers/dma/sh/Kconfig
> ===================================================================
> --- slave-dma.orig/drivers/dma/sh/Kconfig
> +++ slave-dma/drivers/dma/sh/Kconfig
> @@ -22,3 +22,9 @@ config SUDMAC
> depends on SH_DMAE_BASE
> help
> Enable support for the Renesas SUDMAC controllers.
> +
> +config RCAR_HPB_DMAE
> + tristate "Renesas R-Car HPB DMAC support"
> + depends on SH_DMAE_BASE
> + help
> + Enable support for the Renesas R-Car series DMA controllers.
> Index: slave-dma/drivers/dma/sh/Makefile
> ===================================================================
> --- slave-dma.orig/drivers/dma/sh/Makefile
> +++ slave-dma/drivers/dma/sh/Makefile
> @@ -1,3 +1,4 @@
> obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o
> obj-$(CONFIG_SH_DMAE) += shdma.o
> obj-$(CONFIG_SUDMAC) += sudmac.o
> +obj-$(CONFIG_RCAR_HPB_DMAE) += rcar-hpbdma.o
> Index: slave-dma/drivers/dma/sh/rcar-hpbdma.c
> ===================================================================
> --- /dev/null
> +++ slave-dma/drivers/dma/sh/rcar-hpbdma.c
> @@ -0,0 +1,623 @@
> +/*
> + * Copyright (C) 2011-2013 Renesas Electronics Corporation
> + * Copyright (C) 2013 Cogent Embedded, Inc.
> + *
> + * This file is based on the drivers/dma/sh/shdma.c
> + *
> + * Renesas SuperH DMA Engine support
> + *
> + * 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/dmaengine.h>
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/platform_data/dma-rcar-hpbdma.h>
> +#include <linux/platform_device.h>
> +#include <linux/shdma-base.h>
> +#include <linux/slab.h>
> +
> +/* DMA channel registers */
> +#define DSAR0 0x00
> +#define DDAR0 0x04
> +#define DTCR0 0x08
> +#define DSAR1 0x0C
> +#define DDAR1 0x10
> +#define DTCR1 0x14
> +#define DSASR 0x18
> +#define DDASR 0x1C
> +#define DTCSR 0x20
These are not used.
> +#define DPTR 0x24
> +#define DCR 0x28
> +#define DCMDR 0x2C
> +#define DSTPR 0x30
> +#define DSTSR 0x34
> +#define DDBGR 0x38
> +#define DDBGR2 0x3C
These are not used.
> +#define HPB_CHAN(n) (0x40 * (n))
> +
> +/* DMA command register (DCMDR) bits */
> +#define DCMDR_BDOUT BIT(7)
This is not used
> +#define DCMDR_DQSPD BIT(6)
> +#define DCMDR_DQSPC BIT(5)
> +#define DCMDR_DMSPD BIT(4)
> +#define DCMDR_DMSPC BIT(3)
These are not used.
> +#define DCMDR_DQEND BIT(2)
> +#define DCMDR_DNXT BIT(1)
> +#define DCMDR_DMEN BIT(0)
> +
> +/* DMA forced stop register (DSTPR) bits */
> +#define DSTPR_DMSTP BIT(0)
> +
> +/* DMA status register (DSTSR) bits */
> +#define DSTSR_DMSTS BIT(0)
> +
> +/* DMA common registers */
> +#define DTIMR 0x00
This is not used.
> +#define DINTSR0 0x0C
> +#define DINTSR1 0x10
> +#define DINTCR0 0x14
> +#define DINTCR1 0x18
> +#define DINTMR0 0x1C
> +#define DINTMR1 0x20
> +#define DACTSR0 0x24
> +#define DACTSR1 0x28
These are not used.
> +#define HSRSTR(n) (0x40 + (n) * 4)
> +#define HPB_DMASPR(n) (0x140 + (n) * 4)
> +#define HPB_DMLVLR0 0x160
> +#define HPB_DMLVLR1 0x164
> +#define HPB_DMSHPT0 0x168
> +#define HPB_DMSHPT1 0x16C
These are not used.
> +
> +#define HPB_DMA_SLAVE_NUMBER 256
> +#define HPB_DMA_TCR_MAX 0x01000000 /* 16 MiB */
> +
> +struct hpb_dmae_chan {
> + struct shdma_chan shdma_chan;
> + int xfer_mode; /* DMA transfer mode */
> +#define XFER_SINGLE 1
> +#define XFER_DOUBLE 2
> + unsigned plane_idx; /* current DMA information set */
> + bool first_desc; /* first/next transfer */
> + int xmit_shift; /* log_2(bytes_per_xfer) */
> + void __iomem *base;
> + const struct hpb_dmae_slave_config *cfg;
> + char dev_id[16]; /* unique name per DMAC of channel */
> +};
> +
> +struct hpb_dmae_device {
> + struct shdma_dev shdma_dev;
> + spinlock_t reg_lock; /* comm_reg operation lock */
> + struct hpb_dmae_pdata *pdata;
> + void __iomem *chan_reg;
> + void __iomem *comm_reg;
> + void __iomem *reset_reg;
> + void __iomem *mode_reg;
> +};
> +
> +struct hpb_dmae_regs {
> + u32 sar; /* SAR / source address */
> + u32 dar; /* DAR / destination address */
> + u32 tcr; /* TCR / transfer count */
> +};
> +
> +struct hpb_desc {
> + struct shdma_desc shdma_desc;
> + struct hpb_dmae_regs hw;
> + unsigned plane_idx;
> +};
> +
> +#define to_chan(schan) container_of(schan, struct hpb_dmae_chan,
shdma_chan)
> +#define to_desc(sdesc) container_of(sdesc, struct hpb_desc, shdma_desc)
> +#define to_dev(sc) container_of(sc->shdma_chan.dma_chan.device, \
> + struct hpb_dmae_device, shdma_dev.dma_dev)
> +
> +static void ch_reg_write(struct hpb_dmae_chan *hpb_dc, u32 data, u32
reg)
> +{
> + __raw_writel(data, hpb_dc->base + reg);
> +}
> +
> +static u32 ch_reg_read(struct hpb_dmae_chan *hpb_dc, u32 reg)
> +{
> + return __raw_readl(hpb_dc->base + reg);
> +}
> +
> +static void dcmdr_write(struct hpb_dmae_device *hpbdev, u32 data)
> +{
> + __raw_writel(data, hpbdev->chan_reg + DCMDR);
> +}
> +
> +static void hsrstr_write(struct hpb_dmae_device *hpbdev, u32 ch)
> +{
> + __raw_writel(0x1, hpbdev->comm_reg + HSRSTR(ch));
> +}
> +
> +static u32 dintsr_read(struct hpb_dmae_device *hpbdev, u32 ch)
> +{
> + u32 v;
> +
> + if (ch < 32)
> + v = __raw_readl(hpbdev->comm_reg + DINTSR0) >> ch;
> + else
> + v = __raw_readl(hpbdev->comm_reg + DINTSR1) >> (ch - 32);
> + return v & 0x1;
> +}
> +
> +static void dintcr_write(struct hpb_dmae_device *hpbdev, u32 ch)
> +{
> + if (ch < 32)
> + __raw_writel((0x1 << ch), hpbdev->comm_reg + DINTCR0);
> + else
> + __raw_writel((0x1 << (ch - 32)), hpbdev->comm_reg + DINTCR1);
> +}
> +
> +static void asyncmdr_write(struct hpb_dmae_device *hpbdev, u32 data)
> +{
> + __raw_writel(data, hpbdev->mode_reg);
> +}
> +
> +static u32 asyncmdr_read(struct hpb_dmae_device *hpbdev)
> +{
> + return __raw_readl(hpbdev->mode_reg);
> +}
> +
> +static void hpb_dmae_enable_int(struct hpb_dmae_device *hpbdev, u32 ch)
> +{
> + u32 intreg;
> +
> + spin_lock_irq(&hpbdev->reg_lock);
> + if (ch < 32) {
> + intreg = __raw_readl(hpbdev->comm_reg + DINTMR0);
> + __raw_writel(BIT(ch) | intreg, hpbdev->comm_reg + DINTMR0);
> + } else {
> + intreg = __raw_readl(hpbdev->comm_reg + DINTMR1);
> + __raw_writel(BIT(ch - 32) | intreg, hpbdev->comm_reg + DINTMR1);
> + }
> + spin_unlock_irq(&hpbdev->reg_lock);
> +}
> +
> +static void hpb_dmae_async_reset(struct hpb_dmae_device *hpbdev, u32
data)
> +{
> + u32 rstr;
> + int timeout = 10000; /* 100 ms */
> +
> + spin_lock(&hpbdev->reg_lock);
> + rstr = __raw_readl(hpbdev->reset_reg);
> + rstr |= data;
> + __raw_writel(rstr, hpbdev->reset_reg);
> + do {
> + rstr = __raw_readl(hpbdev->reset_reg);
> + if ((rstr & data) == data)
> + break;
> + udelay(10);
> + } while (timeout--);
> +
> + if (timeout < 0)
> + dev_err(hpbdev->shdma_dev.dma_dev.dev,
> + "%s timeout\n", __func__);
> +
> + rstr &= ~data;
> + __raw_writel(rstr, hpbdev->reset_reg);
> + spin_unlock(&hpbdev->reg_lock);
> +}
> +
> +static void hpb_dmae_set_async_mode(struct hpb_dmae_device *hpbdev,
> + u32 mask, u32 data)
> +{
> + u32 mode;
> +
> + spin_lock_irq(&hpbdev->reg_lock);
> + mode = asyncmdr_read(hpbdev);
> + mode &= ~mask;
> + mode |= data;
> + asyncmdr_write(hpbdev, mode);
> + spin_unlock_irq(&hpbdev->reg_lock);
> +}
> +
> +static void hpb_dmae_ctl_stop(struct hpb_dmae_device *hpbdev)
> +{
> + dcmdr_write(hpbdev, DCMDR_DQSPD);
> +}
> +
> +static void hpb_dmae_reset(struct hpb_dmae_device *hpbdev)
> +{
> + u32 ch;
> +
> + for (ch = 0; ch < hpbdev->pdata->num_hw_channels; ch++)
> + hsrstr_write(hpbdev, ch);
> +}
> +
> +static unsigned int calc_xmit_shift(struct hpb_dmae_chan *hpb_chan)
> +{
> + struct hpb_dmae_device *hpbdev = to_dev(hpb_chan);
> + struct hpb_dmae_pdata *pdata = hpbdev->pdata;
> + int width = ch_reg_read(hpb_chan, DCR);
> + int i;
> +
> + switch (width & (DCR_SPDS_MASK | DCR_DPDS_MASK)) {
> + case DCR_SPDS_8BIT | DCR_DPDS_8BIT:
> + default:
> + i = XMIT_SZ_8BIT;
> + break;
> + case DCR_SPDS_16BIT | DCR_DPDS_16BIT:
> + i = XMIT_SZ_16BIT;
> + break;
> + case DCR_SPDS_32BIT | DCR_DPDS_32BIT:
> + i = XMIT_SZ_32BIT;
> + break;
> + }
> + return pdata->ts_shift[i];
> +}
> +
> +static void hpb_dmae_set_reg(struct hpb_dmae_chan *hpb_chan,
> + struct hpb_dmae_regs *hw, unsigned plane)
> +{
> + ch_reg_write(hpb_chan, hw->sar, plane ? DSAR1 : DSAR0);
> + ch_reg_write(hpb_chan, hw->dar, plane ? DDAR1 : DDAR0);
> + ch_reg_write(hpb_chan, hw->tcr >> hpb_chan->xmit_shift,
> + plane ? DTCR1 : DTCR0);
> +}
> +
> +static void hpb_dmae_start(struct hpb_dmae_chan *hpb_chan, bool next)
> +{
> + ch_reg_write(hpb_chan, (next ? DCMDR_DNXT : 0) | DCMDR_DMEN, DCMDR);
> +}
> +
> +static void hpb_dmae_halt(struct shdma_chan *schan)
> +{
> + struct hpb_dmae_chan *chan = to_chan(schan);
> +
> + ch_reg_write(chan, DCMDR_DQEND, DCMDR);
> + ch_reg_write(chan, DSTPR_DMSTP, DSTPR);
> +}
> +
> +static const struct hpb_dmae_slave_config *
> +hpb_dmae_find_slave(struct hpb_dmae_chan *hpb_chan, int slave_id)
> +{
> + struct hpb_dmae_device *hpbdev = to_dev(hpb_chan);
> + struct hpb_dmae_pdata *pdata = hpbdev->pdata;
> + int i;
> +
> + if (slave_id >= HPB_DMA_SLAVE_NUMBER)
> + return NULL;
> +
> + for (i = 0; i < pdata->num_slaves; i++)
> + if (pdata->slaves[i].id == slave_id)
> + return pdata->slaves + i;
> +
> + return NULL;
> +}
> +
> +static void hpb_dmae_start_xfer(struct shdma_chan *schan,
> + struct shdma_desc *sdesc)
> +{
> + struct hpb_dmae_chan *chan = to_chan(schan);
> + struct hpb_dmae_device *hpbdev = to_dev(chan);
> + struct hpb_desc *desc = to_desc(sdesc);
> +
> + if (chan->cfg->flags & HPB_DMAE_SET_ASYNC_RESET)
> + hpb_dmae_async_reset(hpbdev, chan->cfg->rstr);
> +
> + desc->plane_idx = chan->plane_idx;
> + hpb_dmae_set_reg(chan, &desc->hw, chan->plane_idx);
> + hpb_dmae_start(chan, !chan->first_desc);
> +
> + if (chan->xfer_mode == XFER_DOUBLE) {
> + chan->plane_idx ^= 1;
> + chan->first_desc = false;
> + }
> +}
> +
> +static bool hpb_dmae_desc_completed(struct shdma_chan *schan,
> + struct shdma_desc *sdesc)
> +{
> + return true;
> +}
> +
> +static bool hpb_dmae_chan_irq(struct shdma_chan *schan, int irq)
> +{
> + struct hpb_dmae_chan *chan = to_chan(schan);
> + struct hpb_dmae_device *hpbdev = to_dev(chan);
> + int ch = chan->cfg->dma_ch;
> +
> + /* Check Complete DMA Transfer */
> + if (dintsr_read(hpbdev, ch)) {
> + /* Clear Interrupt status */
> + dintcr_write(hpbdev, ch);
> + return true;
> + }
> + return false;
> +}
For some peripherals, e.g. MMC, there is only one physical DMA channel
available for both tx & rx. In this case, the MMC driver should request
two logical channels. So, the DMAC driver should map logical channels to
physical channels. When it comes to the interrupt handler, the only way to
tell if the tx or rx logical channel completed, as far as I can see, is to
check the settings in the DCR reg.
> +
> +static int hpb_dmae_desc_setup(struct shdma_chan *schan,
> + struct shdma_desc *sdesc,
> + dma_addr_t src, dma_addr_t dst, size_t *len)
> +{
> + struct hpb_desc *desc = to_desc(sdesc);
> +
> + if (*len > (size_t)HPB_DMA_TCR_MAX)
> + *len = (size_t)HPB_DMA_TCR_MAX;
> +
> + desc->hw.sar = src;
> + desc->hw.dar = dst;
> + desc->hw.tcr = *len;
> +
> + return 0;
> +}
> +
> +static size_t hpb_dmae_get_partial(struct shdma_chan *schan,
> + struct shdma_desc *sdesc)
> +{
> + struct hpb_desc *desc = to_desc(sdesc);
> + struct hpb_dmae_chan *chan = to_chan(schan);
> + u32 tcr = ch_reg_read(chan, desc->plane_idx ? DTCR1 : DTCR0);
> +
> + return (desc->hw.tcr - tcr) << chan->xmit_shift;
> +}
> +
> +static bool hpb_dmae_channel_busy(struct shdma_chan *schan)
> +{
> + struct hpb_dmae_chan *chan = to_chan(schan);
> + u32 dstsr = ch_reg_read(chan, DSTSR);
> +
> + return (dstsr & DSTSR_DMSTS) == DSTSR_DMSTS;
> +}
> +
> +static int
> +hpb_dmae_alloc_chan_resources(struct hpb_dmae_chan *hpb_chan,
> + const struct hpb_dmae_slave_config *cfg)
> +{
> + struct hpb_dmae_device *hpbdev = to_dev(hpb_chan);
> + struct hpb_dmae_pdata *pdata = hpbdev->pdata;
> + const struct hpb_dmae_channel *channel = pdata->channels;
> + int slave_id = cfg->id;
> + int i, err;
> +
> + for (i = 0; i < pdata->num_channels; i++, channel++) {
> + if (channel->s_id == slave_id) {
> + struct device *dev = hpb_chan->shdma_chan.dev;
> +
> + hpb_chan->base =
> + hpbdev->chan_reg + HPB_CHAN(cfg->dma_ch);
> +
> + dev_dbg(dev, "Detected Slave device\n");
> + dev_dbg(dev, " -- slave_id : 0x%x\n", slave_id);
> + dev_dbg(dev, " -- cfg->dma_ch : %d\n", cfg->dma_ch);
> + dev_dbg(dev, " -- channel->ch_irq: %d\n",
> + channel->ch_irq);
> + break;
> + }
> + }
> +
> + err = shdma_request_irq(&hpb_chan->shdma_chan, channel->ch_irq,
> + IRQF_SHARED, hpb_chan->dev_id);
> + if (err) {
> + dev_err(hpb_chan->shdma_chan.dev,
> + "DMA channel request_irq %d failed with error %d\n",
> + channel->ch_irq, err);
> + return err;
> + }
> +
> + hpb_chan->plane_idx = 0;
> + hpb_chan->first_desc = true;
> +
> + if ((cfg->dcr & (DCR_CT | DCR_DIP)) == 0) {
> + hpb_chan->xfer_mode = XFER_SINGLE;
> + } else if ((cfg->dcr & (DCR_CT | DCR_DIP)) == (DCR_CT | DCR_DIP)) {
> + hpb_chan->xfer_mode = XFER_DOUBLE;
> + } else {
> + dev_err(hpb_chan->shdma_chan.dev, "DCR setting error");
> + shdma_free_irq(&hpb_chan->shdma_chan);
> + return -EINVAL;
> + }
> +
> + if (cfg->flags & HPB_DMAE_SET_ASYNC_MODE)
> + hpb_dmae_set_async_mode(hpbdev, cfg->mdm, cfg->mdr);
> + ch_reg_write(hpb_chan, cfg->dcr, DCR);
> + ch_reg_write(hpb_chan, cfg->port, DPTR);
> + hpb_chan->xmit_shift = calc_xmit_shift(hpb_chan);
> + hpb_dmae_enable_int(hpbdev, cfg->dma_ch);
> +
> + return 0;
> +}
> +
> +static int hpb_dmae_set_slave(struct shdma_chan *schan, int slave_id,
bool try)
> +{
> + struct hpb_dmae_chan *chan = to_chan(schan);
> + const struct hpb_dmae_slave_config *sc =
> + hpb_dmae_find_slave(chan, slave_id);
> +
> + if (!sc)
> + return -ENODEV;
> +
> + chan->cfg = sc;
> + return hpb_dmae_alloc_chan_resources(chan, sc);
> +}
> +
> +static void hpb_dmae_setup_xfer(struct shdma_chan *schan, int slave_id)
> +{
> +}
> +
> +static dma_addr_t hpb_dmae_slave_addr(struct shdma_chan *schan)
> +{
> + struct hpb_dmae_chan *chan = to_chan(schan);
> +
> + return chan->cfg->addr;
> +}
> +
> +static struct shdma_desc *hpb_dmae_embedded_desc(void *buf, int i)
> +{
> + return &((struct hpb_desc *)buf)[i].shdma_desc;
> +}
> +
> +static const struct shdma_ops hpb_dmae_ops = {
> + .desc_completed = hpb_dmae_desc_completed,
> + .halt_channel = hpb_dmae_halt,
> + .channel_busy = hpb_dmae_channel_busy,
> + .slave_addr = hpb_dmae_slave_addr,
> + .desc_setup = hpb_dmae_desc_setup,
> + .set_slave = hpb_dmae_set_slave,
> + .setup_xfer = hpb_dmae_setup_xfer,
> + .start_xfer = hpb_dmae_start_xfer,
> + .embedded_desc = hpb_dmae_embedded_desc,
> + .chan_irq = hpb_dmae_chan_irq,
> + .get_partial = hpb_dmae_get_partial,
> +};
> +
> +static int hpb_dmae_chan_probe(struct hpb_dmae_device *hpbdev, int id)
> +{
> + struct shdma_dev *sdev = &hpbdev->shdma_dev;
> + struct platform_device *pdev =
> + to_platform_device(hpbdev->shdma_dev.dma_dev.dev);
> + struct hpb_dmae_chan *new_hpb_chan;
> + struct shdma_chan *schan;
> +
> + /* alloc channel */
> + new_hpb_chan = devm_kzalloc(&pdev->dev,
> + sizeof(struct hpb_dmae_chan), GFP_KERNEL);
> + if (!new_hpb_chan) {
> + dev_err(hpbdev->shdma_dev.dma_dev.dev,
> + "No free memory for allocating DMA channels!\n");
> + return -ENOMEM;
> + }
> +
> + schan = &new_hpb_chan->shdma_chan;
> + shdma_chan_probe(sdev, schan, id);
> +
> + if (pdev->id >= 0)
> + snprintf(new_hpb_chan->dev_id, sizeof(new_hpb_chan->dev_id),
> + "hpb-dmae%d.%d", pdev->id, id);
> + else
> + snprintf(new_hpb_chan->dev_id, sizeof(new_hpb_chan->dev_id),
> + "hpb-dma.%d", id);
> +
> + return 0;
> +}
> +
> +static int __init hpb_dmae_probe(struct platform_device *pdev)
> +{
> + struct hpb_dmae_pdata *pdata = pdev->dev.platform_data;
> + struct hpb_dmae_device *hpbdev;
> + struct dma_device *dma_dev;
> + struct resource *chan, *comm, *rest, *mode, *irq_res;
> + int err, i;
> +
> + /* get platform data */
> + if (!pdata || !pdata->num_channels)
> + return -ENODEV;
> +
> + chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + comm = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + rest = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> + mode = platform_get_resource(pdev, IORESOURCE_MEM, 3);
> +
> + irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> + if (!irq_res)
> + return -ENODEV;
> +
> + hpbdev = devm_kzalloc(&pdev->dev, sizeof(struct hpb_dmae_device),
> + GFP_KERNEL);
> + if (!hpbdev) {
> + dev_err(&pdev->dev, "Not enough memory\n");
> + return -ENOMEM;
> + }
> +
> + hpbdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan);
> + if (IS_ERR(hpbdev->chan_reg))
> + return PTR_ERR(hpbdev->chan_reg);
> +
> + hpbdev->comm_reg = devm_ioremap_resource(&pdev->dev, comm);
> + if (IS_ERR(hpbdev->comm_reg))
> + return PTR_ERR(hpbdev->comm_reg);
> +
> + hpbdev->reset_reg = devm_ioremap_resource(&pdev->dev, rest);
> + if (IS_ERR(hpbdev->reset_reg))
> + return PTR_ERR(hpbdev->reset_reg);
> +
> + hpbdev->mode_reg = devm_ioremap_resource(&pdev->dev, mode);
> + if (IS_ERR(hpbdev->mode_reg))
> + return PTR_ERR(hpbdev->mode_reg);
> +
> + dma_dev = &hpbdev->shdma_dev.dma_dev;
> +
> + spin_lock_init(&hpbdev->reg_lock);
> +
> + /* platform data */
> + hpbdev->pdata = pdata;
> +
> + /* reset dma controller */
> + hpb_dmae_reset(hpbdev);
> +
> + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
> + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
> +
> + hpbdev->shdma_dev.ops = &hpb_dmae_ops;
> + hpbdev->shdma_dev.desc_size = sizeof(struct hpb_desc);
> + err = shdma_init(&pdev->dev, &hpbdev->shdma_dev,
pdata->num_channels);
> + if (err < 0)
> + return err;
> +
> + /* Create DMA Channel */
> + for (i = 0; i < pdata->num_channels; i++)
> + hpb_dmae_chan_probe(hpbdev, i);
> +
> + platform_set_drvdata(pdev, hpbdev);
> + dma_async_device_register(dma_dev);
> +
> + return err;
> +}
> +
> +static void hpb_dmae_chan_remove(struct hpb_dmae_device *hpbdev)
> +{
> + struct dma_device *dma_dev = &hpbdev->shdma_dev.dma_dev;
> + struct shdma_chan *schan;
> + int i;
> +
> + shdma_for_each_chan(schan, &hpbdev->shdma_dev, i) {
> + BUG_ON(!schan);
> +
> + shdma_free_irq(schan);
> + shdma_chan_remove(schan);
> + }
> + dma_dev->chancnt = 0;
> +}
> +
> +static int __exit hpb_dmae_remove(struct platform_device *pdev)
> +{
> + struct hpb_dmae_device *hpbdev = platform_get_drvdata(pdev);
> +
> + dma_async_device_unregister(&hpbdev->shdma_dev.dma_dev);
> + hpb_dmae_chan_remove(hpbdev);
> +
> + return 0;
> +}
> +
> +static void hpb_dmae_shutdown(struct platform_device *pdev)
> +{
> + struct hpb_dmae_device *hpbdev = platform_get_drvdata(pdev);
> + hpb_dmae_ctl_stop(hpbdev);
> +}
> +
> +static struct platform_driver hpb_dmae_driver __initdata = {
> + .probe = hpb_dmae_probe,
> + .remove = __exit_p(hpb_dmae_remove),
> + .shutdown = hpb_dmae_shutdown,
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = "hpb-dma-engine",
> + },
> +};
> +module_platform_driver(hpb_dmae_driver);
> +
> +MODULE_AUTHOR("Max Filippov <max.filippov@...entembedded.com>");
> +MODULE_DESCRIPTION("Renesas HPB DMA Engine driver");
> +MODULE_LICENSE("GPL");
> Index: slave-dma/include/linux/platform_data/dma-rcar-hpbdma.h
> ===================================================================
> --- /dev/null
> +++ slave-dma/include/linux/platform_data/dma-rcar-hpbdma.h
> @@ -0,0 +1,103 @@
> +/*
> + * Copyright (C) 2011-2013 Renesas Electronics Corporation
> + * Copyright (C) 2013 Cogent Embedded, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + */
> +
> +#ifndef __DMA_RCAR_HPBDMA_H
> +#define __DMA_RCAR_HPBDMA_H
> +
> +#include <linux/bitops.h>
> +#include <linux/types.h>
> +
> +/* Transmit sizes and respective register values */
> +enum {
> + XMIT_SZ_8BIT = 0,
> + XMIT_SZ_16BIT = 1,
> + XMIT_SZ_32BIT = 2,
> + XMIT_SZ_MAX
> +};
> +
> +/* DMA control register (DCR) bits */
> +#define DCR_DTAMD (1u << 26)
> +#define DCR_DTAC (1u << 25)
> +#define DCR_DTAU (1u << 24)
> +#define DCR_DTAU1 (1u << 23)
> +#define DCR_SWMD (1u << 22)
> +#define DCR_BTMD (1u << 21)
> +#define DCR_PKMD (1u << 20)
> +#define DCR_CT (1u << 18)
> +#define DCR_ACMD (1u << 17)
> +#define DCR_DIP (1u << 16)
> +#define DCR_SMDL (1u << 13)
> +#define DCR_SPDAM (1u << 12)
> +#define DCR_SDRMD_MASK (3u << 10)
> +#define DCR_SDRMD_MOD (0u << 10)
> +#define DCR_SDRMD_AUTO (1u << 10)
> +#define DCR_SDRMD_TIMER (2u << 10)
> +#define DCR_SPDS_MASK (3u << 8)
> +#define DCR_SPDS_8BIT (0u << 8)
> +#define DCR_SPDS_16BIT (1u << 8)
> +#define DCR_SPDS_32BIT (2u << 8)
> +#define DCR_DMDL (1u << 5)
> +#define DCR_DPDAM (1u << 4)
> +#define DCR_DDRMD_MASK (3u << 2)
> +#define DCR_DDRMD_MOD (0u << 2)
> +#define DCR_DDRMD_AUTO (1u << 2)
> +#define DCR_DDRMD_TIMER (2u << 2)
> +#define DCR_DPDS_MASK (3u << 0)
> +#define DCR_DPDS_8BIT (0u << 0)
> +#define DCR_DPDS_16BIT (1u << 0)
> +#define DCR_DPDS_32BIT (2u << 0)
> +
> +/* Asynchronous reset register (ASYNCRSTR) bits */
> +#define ASYNCRSTR_ASRST41 BIT(10)
> +#define ASYNCRSTR_ASRST40 BIT(9)
> +#define ASYNCRSTR_ASRST39 BIT(8)
> +#define ASYNCRSTR_ASRST27 BIT(7)
> +#define ASYNCRSTR_ASRST26 BIT(6)
> +#define ASYNCRSTR_ASRST25 BIT(5)
> +#define ASYNCRSTR_ASRST24 BIT(4)
> +#define ASYNCRSTR_ASRST23 BIT(3)
> +#define ASYNCRSTR_ASRST22 BIT(2)
> +#define ASYNCRSTR_ASRST21 BIT(1)
> +#define ASYNCRSTR_ASRST20 BIT(0)
If you replace this with a macro with an argument, you can simplify the
setup code. I.e. since we already have .dma_ch in the slave config struct,
you won't need the .rstr field.
Similarly, looking at your patches to add SDHC DMA support, the .mdr and
.mdm fields do not need to be channel specific. All we really need to know
is if the channel needs async MD single and async BTMD burst. The
calculation for the bits required can be internal to the DMAC driver.
> +
> +struct hpb_dmae_slave_config {
> + unsigned int id;
> + dma_addr_t addr;
> + u32 dcr;
> + u32 port;
> + u32 rstr;
> + u32 mdr;
> + u32 mdm;
> + u32 flags;
> +#define HPB_DMAE_SET_ASYNC_RESET BIT(0)
> +#define HPB_DMAE_SET_ASYNC_MODE BIT(1)
> + u32 dma_ch;
> +};
> +
> +#define HPB_DMAE_CHANNEL(_irq, _s_id) \
> +{ \
> + .ch_irq = _irq, \
> + .s_id = _s_id, \
> +}
> +
> +struct hpb_dmae_channel {
> + unsigned int ch_irq;
> + unsigned int s_id;
> +};
> +
> +struct hpb_dmae_pdata {
> + const struct hpb_dmae_slave_config *slaves;
> + int num_slaves;
> + const struct hpb_dmae_channel *channels;
> + int num_channels;
> + const unsigned int ts_shift[XMIT_SZ_MAX];
> + int num_hw_channels;
> +};
> +
> +#endif
> --
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