[PATCH/RFC 2/4] mmc: renesas_sdhi, tmio: make dma more modular

Simon Horman
2016-06-15T04:01:55Z

Refactor DMA support to allow it to be provided by a set of call-backs
that are provided by a host driver. The motivation is to allow multiple
DMA implementations to be provided and instantiated at run-time.

Instantiate the existing DMA implementation from the renesas_sdhi driver
which appears to match the current use-case. This has the side effect
of moving the DMA code from the tmio_core to the renesas_sdhi driver.

A follow-up patch will change the source file for the SDHI DMA
implementation accordingly.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
drivers/mmc/host/Kconfig | 9 ++++++++
drivers/mmc/host/Makefile | 2 +-
drivers/mmc/host/renesas_sdhi.c | 13 ++++++++++++
drivers/mmc/host/tmio_mmc.h | 39 ++++++++--------------------------
drivers/mmc/host/tmio_mmc_dma.c | 26 ++++++++++++++++++-----
drivers/mmc/host/tmio_mmc_pio.c | 47 +++++++++++++++++++++++++++++++++++++++++
6 files changed, 100 insertions(+), 36 deletions(-)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 840b17150263..7ccae04632aa 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -564,10 +564,19 @@ config MMC_SDHI
depends on SUPERH || ARM || ARM64
depends on SUPERH || ARCH_RENESAS || COMPILE_TEST
select MMC_TMIO_CORE
+ select MMC_SDHI_DMA if (SUPERH || ARM)
help
This provides support for the SDHI SD/SDIO controller found in
SuperH, and Renesas ARM and arm64 based SoCs.

+config MMC_SDHI_DMA
+ tristate "DMA support for non R-Car Gen 3 Renesas SDHI SD/SDIO controller"
+ depends on SUPERH || ARM || COMPILE_TEST
+ depends on MMC_SDHI
+ help
+ This provides DMA support for the DMA support the SDHI SD/SDIO
+ found in SuperH and Renesas ARM based SoCs.
+
config MMC_CB710
tristate "ENE CB710 MMC/SD Interface support"
depends on PCI
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 206233218781..4f7903fbef26 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -37,8 +37,8 @@ obj-$(CONFIG_MMC_SDRICOH_CS) += sdricoh_cs.o
obj-$(CONFIG_MMC_TMIO) += tmio_mmc.o
obj-$(CONFIG_MMC_TMIO_CORE) += tmio_mmc_core.o
tmio_mmc_core-y := tmio_mmc_pio.o
-tmio_mmc_core-$(subst m,y,$(CONFIG_MMC_SDHI)) += tmio_mmc_dma.o
obj-$(CONFIG_MMC_SDHI) += renesas_sdhi.o
+renesas_sdhi-$(subst m,y,$(CONFIG_MMC_SDHI_DMA)) += tmio_mmc_dma.o
obj-$(CONFIG_MMC_CB710) += cb710-mmc.o
obj-$(CONFIG_MMC_VIA_SDMMC) += via-sdmmc.o
obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o
diff --git a/drivers/mmc/host/renesas_sdhi.c b/drivers/mmc/host/renesas_sdhi.c
index c3b651bf89cb..4403dfe1413d 100644
--- a/drivers/mmc/host/renesas_sdhi.c
+++ b/drivers/mmc/host/renesas_sdhi.c
@@ -106,6 +106,15 @@ struct sh_mobile_sdhi {
struct pinctrl_state *pins_default, *pins_uhs;
};

+#if IS_ENABLED(CONFIG_MMC_SDHI_DMA)
+int tmio_mmc_init_dma(void);
+#else
+static int tmio_mmc_init_dma(void)
+{
+ return -EINVAL;
+}
+#endif
+
static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
{
u32 val;
@@ -363,6 +372,10 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
host->bus_shift = of_data->bus_shift;
}

+ ret = tmio_mmc_init_dma();
+ if (ret < 0)
+ goto efree;
+
host->dma = dma_priv;
host->write16_hook = sh_mobile_sdhi_write16_hook;
host->clk_enable = sh_mobile_sdhi_clk_enable;
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 7f63ec05bdf4..cbe0212fbbf4 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -187,37 +187,16 @@ static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg,
local_irq_restore(*flags);
}

-#if defined(CONFIG_MMC_SDHI) || defined(CONFIG_MMC_SDHI_MODULE)
-void tmio_mmc_start_dma(struct tmio_mmc_host *host, struct mmc_data *data);
-void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable);
-void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata);
-void tmio_mmc_release_dma(struct tmio_mmc_host *host);
-void tmio_mmc_abort_dma(struct tmio_mmc_host *host);
-#else
-static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
- struct mmc_data *data)
-{
-}
-
-static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
-{
-}
-
-static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
- struct tmio_mmc_data *pdata)
-{
- host->chan_tx = NULL;
- host->chan_rx = NULL;
-}
-
-static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
-{
-}
+struct tmio_mmc_dma_ops {
+ void (*start)(struct tmio_mmc_host *host, struct mmc_data *data);
+ void (*enable)(struct tmio_mmc_host *host, bool enable);
+ void (*request)(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata);
+ void (*release)(struct tmio_mmc_host *host);
+ void (*abort)(struct tmio_mmc_host *host);
+};

-static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
-{
-}
-#endif
+void tmio_set_dma_ops(const struct tmio_mmc_dma_ops *ops);

#ifdef CONFIG_PM
int tmio_mmc_host_runtime_suspend(struct device *dev);
diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c
index fa8a936a3d9b..381bc40e506b 100644
--- a/drivers/mmc/host/tmio_mmc_dma.c
+++ b/drivers/mmc/host/tmio_mmc_dma.c
@@ -22,7 +22,7 @@

#define TMIO_MMC_MIN_DMA_LEN 8

-void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
+static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
{
if (!host->chan_tx || !host->chan_rx)
return;
@@ -31,7 +31,7 @@ void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
host->dma->enable(host, enable);
}

-void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
+static void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
{
tmio_mmc_enable_dma(host, false);

@@ -187,7 +187,7 @@ pio:
}
}

-void tmio_mmc_start_dma(struct tmio_mmc_host *host,
+static void tmio_mmc_start_dma(struct tmio_mmc_host *host,
struct mmc_data *data)
{
if (data->flags & MMC_DATA_READ) {
@@ -244,7 +244,8 @@ out:
spin_unlock_irq(&host->lock);
}

-void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata)
+static void tmio_mmc_request_dma(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata)
{
/* We can only either use DMA for both Tx and Rx or not use it at all */
if (!host->dma || (!host->pdev->dev.of_node &&
@@ -324,7 +325,7 @@ ecfgtx:
host->chan_tx = NULL;
}

-void tmio_mmc_release_dma(struct tmio_mmc_host *host)
+static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
{
if (host->chan_tx) {
struct dma_chan *chan = host->chan_tx;
@@ -341,3 +342,18 @@ void tmio_mmc_release_dma(struct tmio_mmc_host *host)
host->bounce_buf = NULL;
}
}
+
+static struct tmio_mmc_dma_ops tmio_mmc_dma_ops __initdata = {
+ .start = tmio_mmc_start_dma,
+ .enable = tmio_mmc_enable_dma,
+ .request = tmio_mmc_request_dma,
+ .release = tmio_mmc_release_dma,
+ .abort = tmio_mmc_abort_dma,
+};
+
+int tmio_mmc_init_dma(void)
+{
+ tmio_set_dma_ops(&tmio_mmc_dma_ops);
+
+ return 0;
+}
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index f44e2ab7aea2..59e773cc36c1 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -52,17 +52,63 @@

#include "tmio_mmc.h"

+static struct tmio_mmc_dma_ops tmio_dma_ops;
+
+void tmio_set_dma_ops(const struct tmio_mmc_dma_ops *ops)
+{
+ tmio_dma_ops = *ops;
+}
+EXPORT_SYMBOL(tmio_set_dma_ops);
+
+static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
+ struct mmc_data *data)
+{
+ if (tmio_dma_ops.start)
+ tmio_dma_ops.start(host, data);
+}
+
+static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
+{
+ if (tmio_dma_ops.enable)
+ tmio_dma_ops.enable(host, enable);
+}
+
+static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata)
+{
+ if (tmio_dma_ops.request) {
+ tmio_dma_ops.request(host, pdata);
+ } else {
+ host->chan_tx = NULL;
+ host->chan_rx = NULL;
+ }
+}
+
+static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
+{
+ if (tmio_dma_ops.release)
+ tmio_dma_ops.release(host);
+}
+
+static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
+{
+ if (tmio_dma_ops.abort)
+ tmio_dma_ops.abort(host);
+}
+
void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
}
+EXPORT_SYMBOL(tmio_mmc_enable_mmc_irqs);

void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
}
+EXPORT_SYMBOL(tmio_mmc_disable_mmc_irqs);

static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
{
@@ -519,6 +565,7 @@ void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)

schedule_work(&host->done);
}
+EXPORT_SYMBOL(tmio_mmc_do_data_irq);

static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
{
--
2.1.4