ASoC: sh: FSI: Remove DMA support

SuperH FSI device have the hardware limitation to use DMA.
If DMA is used, LCD output will be broken.
Maybe there are some solution. But I don't know how to do it now.
This patch remove DMA support and use soft transfer.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 20 insertions, 122 deletions

diff --git a/sound/soc/sh/Kconfig b/sound/soc/sh/Kconfig
index 9154b4363db3..9e6976586554 100644
--- a/sound/soc/sh/Kconfig
+++ b/sound/soc/sh/Kconfig
@@ -23,7 +23,6 @@ config SND_SOC_SH4_SSI
 config SND_SOC_SH4_FSI
         tristate "SH4 FSI support"
         depends on CPU_SUBTYPE_SH7724
-        select SH_DMA
         help
           This option enables FSI sound support
 
diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index 44123248b630..9742a280ba15 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -26,8 +26,6 @@
 #include <sound/pcm_params.h>
 #include <sound/sh_fsi.h>
 #include <asm/atomic.h>
-#include <asm/dma.h>
-#include <asm/dma-sh.h>
 
 #define DO_FMT          0x0000
 #define DOFF_CTL        0x0004
@@ -97,7 +95,6 @@ struct fsi_priv {
 
         int fifo_max;
         int chan;
-        int dma_chan;
 
         int byte_offset;
         int period_len;
@@ -308,62 +305,6 @@ static int fsi_get_fifo_residue(struct fsi_priv *fsi, int is_play)
         return residue;
 }
 
-static int fsi_get_residue(struct fsi_priv *fsi, int is_play)
-{
-        int residue;
-        int width;
-        struct snd_pcm_runtime *runtime;
-
-        runtime = fsi->substream->runtime;
-
-        /* get 1 channel data width */
-        width = frames_to_bytes(runtime, 1) / fsi->chan;
-
-        if (2 == width)
-                residue = fsi_get_fifo_residue(fsi, is_play);
-        else
-                residue = get_dma_residue(fsi->dma_chan);
-
-        return residue;
-}
-
-/************************************************************************
-
-
-                basic dma function
-
-
-************************************************************************/
-#define PORTA_DMA 0
-#define PORTB_DMA 1
-
-static int fsi_get_dma_chan(void)
-{
-        if (0 != request_dma(PORTA_DMA, "fsia"))
-                return -EIO;
-
-        if (0 != request_dma(PORTB_DMA, "fsib")) {
-                free_dma(PORTA_DMA);
-                return -EIO;
-        }
-
-        master->fsia.dma_chan = PORTA_DMA;
-        master->fsib.dma_chan = PORTB_DMA;
-
-        return 0;
-}
-
-static void fsi_free_dma_chan(void)
-{
-        dma_wait_for_completion(PORTA_DMA);
-        dma_wait_for_completion(PORTB_DMA);
-        free_dma(PORTA_DMA);
-        free_dma(PORTB_DMA);
-
-        master->fsia.dma_chan = -1;
-        master->fsib.dma_chan = -1;
-}
-
 /************************************************************************
 
 
@@ -435,44 +376,6 @@ static void fsi_soft_all_reset(void)
         mdelay(10);
 }
 
-static void fsi_16data_push(struct fsi_priv *fsi,
-                           struct snd_pcm_runtime *runtime,
-                           int send)
-{
-        u16 *dma_start;
-        u32 snd;
-        int i;
-
-        /* get dma start position for FSI */
-        dma_start = (u16 *)runtime->dma_area;
-        dma_start += fsi->byte_offset / 2;
-
-        /*
-         * soft dma
-         * FSI can not use DMA when 16bpp
-         */
-        for (i = 0; i < send; i++) {
-                snd = (u32)dma_start[i];
-                fsi_reg_write(fsi, DODT, snd << 8);
-        }
-}
-
-static void fsi_32data_push(struct fsi_priv *fsi,
-                           struct snd_pcm_runtime *runtime,
-                           int send)
-{
-        u32 *dma_start;
-
-        /* get dma start position for FSI */
-        dma_start = (u32 *)runtime->dma_area;
-        dma_start += fsi->byte_offset / 4;
-
-        dma_wait_for_completion(fsi->dma_chan);
-        dma_configure_channel(fsi->dma_chan, (SM_INC|0x400|TS_32|TM_BUR));
-        dma_write(fsi->dma_chan, (u32)dma_start,
-                  (u32)(fsi->base + DODT), send * 4);
-}
-
 /* playback interrupt */
 static int fsi_data_push(struct fsi_priv *fsi)
 {
@@ -481,6 +384,8 @@ static int fsi_data_push(struct fsi_priv *fsi)
         int send;
         int fifo_free;
         int width;
+        u8 *start;
+        int i;
 
         if (!fsi                        ||
             !fsi->substream             ||
@@ -515,12 +420,22 @@ static int fsi_data_push(struct fsi_priv *fsi)
         if (fifo_free < send)
                 send = fifo_free;
 
-        if (2 == width)
-                fsi_16data_push(fsi, runtime, send);
-        else if (4 == width)
-                fsi_32data_push(fsi, runtime, send);
-        else
+        start = runtime->dma_area;
+        start += fsi->byte_offset;
+
+        switch (width) {
+        case 2:
+                for (i = 0; i < send; i++)
+                        fsi_reg_write(fsi, DODT,
+                                      ((u32)*((u16 *)start + i) << 8));
+                break;
+        case 4:
+                for (i = 0; i < send; i++)
+                        fsi_reg_write(fsi, DODT, *((u32 *)start + i));
+                break;
+        default:
                 return -EINVAL;
+        }
 
         fsi->byte_offset += send * width;
 
@@ -664,8 +579,6 @@ static int fsi_dai_startup(struct snd_pcm_substream *substream,
         }
 
         fsi_reg_write(fsi, reg, data);
-        dev_dbg(dai->dev, "use %s format (%d channel) use %d DMAC\n",
-                msg, fsi->chan, fsi->dma_chan);
 
         /*
          * clear clk reset if master mode
@@ -780,10 +693,9 @@ static snd_pcm_uframes_t fsi_pointer(struct snd_pcm_substream *substream)
 {
         struct snd_pcm_runtime *runtime = substream->runtime;
         struct fsi_priv *fsi = fsi_get(substream);
-        int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
         long location;
 
-        location = (fsi->byte_offset - 1) - fsi_get_residue(fsi, is_play);
+        location = (fsi->byte_offset - 1);
         if (location < 0)
                 location = 0;
 
@@ -912,22 +824,13 @@ static int fsi_probe(struct platform_device *pdev)
         master->fsia.base       = master->base;
         master->fsib.base       = master->base + 0x40;
 
-        master->fsia.dma_chan = -1;
-        master->fsib.dma_chan = -1;
-
-        ret = fsi_get_dma_chan();
-        if (ret < 0) {
-                dev_err(&pdev->dev, "cannot get dma api\n");
-                goto exit_iounmap;
-        }
-
         /* FSI is based on SPU mstp */
         snprintf(clk_name, sizeof(clk_name), "spu%d", pdev->id);
         master->clk = clk_get(NULL, clk_name);
         if (IS_ERR(master->clk)) {
                 dev_err(&pdev->dev, "cannot get %s mstp\n", clk_name);
                 ret = -EIO;
-                goto exit_free_dma;
+                goto exit_iounmap;
         }
 
         fsi_soc_dai[0].dev              = &pdev->dev;
@@ -938,7 +841,7 @@ static int fsi_probe(struct platform_device *pdev)
         ret = request_irq(irq, &fsi_interrupt, IRQF_DISABLED, "fsi", master);
         if (ret) {
                 dev_err(&pdev->dev, "irq request err\n");
-                goto exit_free_dma;
+                goto exit_iounmap;
         }
 
         ret = snd_soc_register_platform(&fsi_soc_platform);
@@ -951,8 +854,6 @@ static int fsi_probe(struct platform_device *pdev)
 
 exit_free_irq:
         free_irq(irq, master);
-exit_free_dma:
-        fsi_free_dma_chan();
 exit_iounmap:
         iounmap(master->base);
 exit_kfree:
@@ -969,8 +870,6 @@ static int fsi_remove(struct platform_device *pdev)
 
         clk_put(master->clk);
 
-        fsi_free_dma_chan();
-
         free_irq(master->irq, master);
 
         iounmap(master->base);