sh: implement DMA_SLAVE capability in SH dmaengine driver

Tested to work with a SIU ASoC driver on sh7722 (migor).

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 144 insertions, 53 deletions

diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index 3e1037c5ebd1..b75ce8b84c46 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -48,6 +48,9 @@ enum sh_dmae_desc_status {
  */
 #define RS_DEFAULT  (RS_DUAL)
 
+/* A bitmask with bits enough for enum sh_dmae_slave_chan_id */
+static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SHDMA_SLAVE_NUMBER)];
+
 static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all);
 
 #define SH_DMAC_CHAN_BASE(id) (dma_base_addr[id])
@@ -61,12 +64,6 @@ static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
         return ctrl_inl(SH_DMAC_CHAN_BASE(sh_dc->id) + reg);
 }
 
-static void dmae_init(struct sh_dmae_chan *sh_chan)
-{
-        u32 chcr = RS_DEFAULT; /* default is DUAL mode */
-        sh_dmae_writel(sh_chan, chcr, CHCR);
-}
-
 /*
  * Reset DMA controller
  *
@@ -106,9 +103,8 @@ static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
 }
 
 static unsigned int ts_shift[] = TS_SHIFT;
-static inline unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan)
+static inline unsigned int calc_xmit_shift(u32 chcr)
 {
-        u32 chcr = sh_dmae_readl(sh_chan, CHCR);
         int cnt = ((chcr & CHCR_TS_LOW_MASK) >> CHCR_TS_LOW_SHIFT) |
                 ((chcr & CHCR_TS_HIGH_MASK) >> CHCR_TS_HIGH_SHIFT);
 
@@ -119,7 +115,7 @@ 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 >> calc_xmit_shift(sh_chan), TCR);
+        sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
 }
 
 static void dmae_start(struct sh_dmae_chan *sh_chan)
@@ -127,7 +123,7 @@ static void dmae_start(struct sh_dmae_chan *sh_chan)
         u32 chcr = sh_dmae_readl(sh_chan, CHCR);
 
         chcr |= CHCR_DE | CHCR_IE;
-        sh_dmae_writel(sh_chan, chcr, CHCR);
+        sh_dmae_writel(sh_chan, chcr & ~CHCR_TE, CHCR);
 }
 
 static void dmae_halt(struct sh_dmae_chan *sh_chan)
@@ -138,20 +134,27 @@ static void dmae_halt(struct sh_dmae_chan *sh_chan)
         sh_dmae_writel(sh_chan, chcr, CHCR);
 }
 
+static void dmae_init(struct sh_dmae_chan *sh_chan)
+{
+        u32 chcr = RS_DEFAULT; /* default is DUAL mode */
+        sh_chan->xmit_shift = calc_xmit_shift(chcr);
+        sh_dmae_writel(sh_chan, chcr, CHCR);
+}
+
 static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
 {
         /* When DMA was working, can not set data to CHCR */
         if (dmae_is_busy(sh_chan))
                 return -EBUSY;
 
+        sh_chan->xmit_shift = calc_xmit_shift(val);
         sh_dmae_writel(sh_chan, val, CHCR);
+
         return 0;
 }
 
-#define DMARS1_ADDR     0x04
-#define DMARS2_ADDR     0x08
-#define DMARS_SHIFT 8
-#define DMARS_CHAN_MSK 0x01
+#define DMARS_SHIFT     8
+#define DMARS_CHAN_MSK  0x01
 static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
 {
         u32 addr;
@@ -163,29 +166,18 @@ static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
         if (sh_chan->id & DMARS_CHAN_MSK)
                 shift = DMARS_SHIFT;
 
-        switch (sh_chan->id) {
-        /* DMARS0 */
-        case 0:
-        case 1:
-                addr = SH_DMARS_BASE;
-                break;
-        /* DMARS1 */
-        case 2:
-        case 3:
-                addr = (SH_DMARS_BASE + DMARS1_ADDR);
-                break;
-        /* DMARS2 */
-        case 4:
-        case 5:
-                addr = (SH_DMARS_BASE + DMARS2_ADDR);
-                break;
-        default:
+        if (sh_chan->id < 6)
+                /* DMA0RS0 - DMA0RS2 */
+                addr = SH_DMARS_BASE0 + (sh_chan->id / 2) * 4;
+#ifdef SH_DMARS_BASE1
+        else if (sh_chan->id < 12)
+                /* DMA1RS0 - DMA1RS2 */
+                addr = SH_DMARS_BASE1 + ((sh_chan->id - 6) / 2) * 4;
+#endif
+        else
                 return -EINVAL;
-        }
 
-        ctrl_outw((val << shift) |
-                (ctrl_inw(addr) & (shift ? 0xFF00 : 0x00FF)),
-                addr);
+        ctrl_outw((val << shift) | (ctrl_inw(addr) & (0xFF00 >> shift)), addr);
 
         return 0;
 }
@@ -253,10 +245,53 @@ static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
         return NULL;
 }
 
+static struct sh_dmae_slave_config *sh_dmae_find_slave(
+        struct sh_dmae_chan *sh_chan, enum sh_dmae_slave_chan_id slave_id)
+{
+        struct dma_device *dma_dev = sh_chan->common.device;
+        struct sh_dmae_device *shdev = container_of(dma_dev,
+                                        struct sh_dmae_device, common);
+        struct sh_dmae_pdata *pdata = &shdev->pdata;
+        int i;
+
+        if ((unsigned)slave_id >= SHDMA_SLAVE_NUMBER)
+                return NULL;
+
+        for (i = 0; i < pdata->config_num; i++)
+                if (pdata->config[i].slave_id == slave_id)
+                        return pdata->config + i;
+
+        return NULL;
+}
+
 static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
 {
         struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
         struct sh_desc *desc;
+        struct sh_dmae_slave *param = chan->private;
+
+        /*
+         * This relies on the guarantee from dmaengine that alloc_chan_resources
+         * never runs concurrently with itself or free_chan_resources.
+         */
+        if (param) {
+                struct sh_dmae_slave_config *cfg;
+
+                cfg = sh_dmae_find_slave(sh_chan, param->slave_id);
+                if (!cfg)
+                        return -EINVAL;
+
+                if (test_and_set_bit(param->slave_id, sh_dmae_slave_used))
+                        return -EBUSY;
+
+                param->config = cfg;
+
+                dmae_set_dmars(sh_chan, cfg->mid_rid);
+                dmae_set_chcr(sh_chan, cfg->chcr);
+        } else {
+                if ((sh_dmae_readl(sh_chan, CHCR) & 0x700) != 0x400)
+                        dmae_set_chcr(sh_chan, RS_DEFAULT);
+        }
 
         spin_lock_bh(&sh_chan->desc_lock);
         while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) {
@@ -289,10 +324,18 @@ static void sh_dmae_free_chan_resources(struct dma_chan *chan)
         struct sh_desc *desc, *_desc;
         LIST_HEAD(list);
 
+        dmae_halt(sh_chan);
+
         /* Prepared and not submitted descriptors can still be on the queue */
         if (!list_empty(&sh_chan->ld_queue))
                 sh_dmae_chan_ld_cleanup(sh_chan, true);
 
+        if (chan->private) {
+                /* The caller is holding dma_list_mutex */
+                struct sh_dmae_slave *param = chan->private;
+                clear_bit(param->slave_id, sh_dmae_slave_used);
+        }
+
         spin_lock_bh(&sh_chan->desc_lock);
 
         list_splice_init(&sh_chan->ld_free, &list);
@@ -304,7 +347,7 @@ static void sh_dmae_free_chan_resources(struct dma_chan *chan)
                 kfree(desc);
 }
 
-/*
+/**
  * sh_dmae_add_desc - get, set up and return one transfer descriptor
  * @sh_chan:    DMA channel
  * @flags:      DMA transfer flags
@@ -351,12 +394,14 @@ static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan,
                 new->async_tx.cookie = -EINVAL;
         }
 
-        dev_dbg(sh_chan->dev, "chaining (%u/%u)@%x -> %x with %p, cookie %d\n",
+        dev_dbg(sh_chan->dev,
+                "chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n",
                 copy_size, *len, *src, *dest, &new->async_tx,
-                new->async_tx.cookie);
+                new->async_tx.cookie, sh_chan->xmit_shift);
 
         new->mark = DESC_PREPARED;
         new->async_tx.flags = flags;
+        new->direction = direction;
 
         *len -= copy_size;
         if (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE)
@@ -465,6 +510,8 @@ static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
         if (!chan || !len)
                 return NULL;
 
+        chan->private = NULL;
+
         sh_chan = to_sh_chan(chan);
 
         sg_init_table(&sg, 1);
@@ -477,6 +524,44 @@ static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
                                flags);
 }
 
+static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
+        struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
+        enum dma_data_direction direction, unsigned long flags)
+{
+        struct sh_dmae_slave *param;
+        struct sh_dmae_chan *sh_chan;
+
+        if (!chan)
+                return NULL;
+
+        sh_chan = to_sh_chan(chan);
+        param = chan->private;
+
+        /* Someone calling slave DMA on a public channel? */
+        if (!param || !sg_len) {
+                dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n",
+                         __func__, param, sg_len, param ? param->slave_id : -1);
+                return NULL;
+        }
+
+        /*
+         * if (param != NULL), this is a successfully requested slave channel,
+         * therefore param->config != NULL too.
+         */
+        return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &param->config->addr,
+                               direction, flags);
+}
+
+static void sh_dmae_terminate_all(struct dma_chan *chan)
+{
+        struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
+
+        if (!chan)
+                return;
+
+        sh_dmae_chan_ld_cleanup(sh_chan, true);
+}
+
 static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
 {
         struct sh_desc *desc, *_desc;
@@ -508,7 +593,11 @@ static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all
                         cookie = tx->cookie;
 
                 if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
-                        BUG_ON(sh_chan->completed_cookie != desc->cookie - 1);
+                        if (sh_chan->completed_cookie != desc->cookie - 1)
+                                dev_dbg(sh_chan->dev,
+                                        "Completing cookie %d, expected %d\n",
+                                        desc->cookie,
+                                        sh_chan->completed_cookie + 1);
                         sh_chan->completed_cookie = desc->cookie;
                 }
 
@@ -581,7 +670,7 @@ static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
                 return;
         }
 
-        /* Find the first un-transfer desciptor */
+        /* Find the first not transferred desciptor */
         list_for_each_entry(sd, &sh_chan->ld_queue, node)
                 if (sd->mark == DESC_SUBMITTED) {
                         /* Get the ld start address from ld_queue */
@@ -685,11 +774,14 @@ static void dmae_do_tasklet(unsigned long data)
         struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
         struct sh_desc *desc;
         u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
+        u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
 
         spin_lock(&sh_chan->desc_lock);
         list_for_each_entry(desc, &sh_chan->ld_queue, node) {
-                if ((desc->hw.sar + desc->hw.tcr) == sar_buf &&
-                    desc->mark == DESC_SUBMITTED) {
+                if (desc->mark == DESC_SUBMITTED &&
+                    ((desc->direction == DMA_FROM_DEVICE &&
+                      (desc->hw.dar + desc->hw.tcr) == dar_buf) ||
+                     (desc->hw.sar + desc->hw.tcr) == sar_buf)) {
                         dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n",
                                 desc->async_tx.cookie, &desc->async_tx,
                                 desc->hw.dar);
@@ -762,7 +854,7 @@ static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id)
         }
 
         snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
-                        "sh-dmae%d", new_sh_chan->id);
+                 "sh-dmae%d", new_sh_chan->id);
 
         /* set up channel irq */
         err = request_irq(irq, &sh_dmae_interrupt, irqflags,
@@ -773,11 +865,6 @@ static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id)
                 goto err_no_irq;
         }
 
-        /* CHCR register control function */
-        new_sh_chan->set_chcr = dmae_set_chcr;
-        /* DMARS register control function */
-        new_sh_chan->set_dmars = dmae_set_dmars;
-
         shdev->chan[id] = new_sh_chan;
         return 0;
 
@@ -848,12 +935,19 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
         INIT_LIST_HEAD(&shdev->common.channels);
 
         dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
+        dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
+
         shdev->common.device_alloc_chan_resources
                 = sh_dmae_alloc_chan_resources;
         shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
         shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
         shdev->common.device_is_tx_complete = sh_dmae_is_complete;
         shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
+
+        /* Compulsory for DMA_SLAVE fields */
+        shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
+        shdev->common.device_terminate_all = sh_dmae_terminate_all;
+
         shdev->common.dev = &pdev->dev;
         /* Default transfer size of 32 bytes requires 32-byte alignment */
         shdev->common.copy_align = 5;
diff --git a/drivers/dma/shdma.h b/drivers/dma/shdma.h
index 108f1cffb6f5..7e227f3c87c4 100644
--- a/drivers/dma/shdma.h
+++ b/drivers/dma/shdma.h
@@ -29,6 +29,7 @@ struct sh_desc {
         struct sh_dmae_regs hw;
         struct list_head node;
         struct dma_async_tx_descriptor async_tx;
+        enum dma_data_direction direction;
         dma_cookie_t cookie;
         int chunks;
         int mark;
@@ -45,13 +46,9 @@ struct sh_dmae_chan {
         struct device *dev;             /* Channel device */
         struct tasklet_struct tasklet;  /* Tasklet */
         int descs_allocated;            /* desc count */
+        int xmit_shift;                 /* log_2(bytes_per_xfer) */
         int id;                         /* Raw id of this channel */
         char dev_id[16];                /* unique name per DMAC of channel */
-
-        /* Set chcr */
-        int (*set_chcr)(struct sh_dmae_chan *sh_chan, u32 regs);
-        /* Set DMA resource */
-        int (*set_dmars)(struct sh_dmae_chan *sh_chan, u16 res);
 };
 
 struct sh_dmae_device {