dmaengine: shdma: convert to platform device resources
[linux-2.6.git] / drivers / dma / shdma.c
index 7731169..ab12fa5 100644 (file)
@@ -53,15 +53,24 @@ 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])
 static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
 {
-       ctrl_outl(data, SH_DMAC_CHAN_BASE(sh_dc->id) + reg);
+       __raw_writel(data, sh_dc->base + reg / sizeof(u32));
 }
 
 static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
 {
-       return ctrl_inl(SH_DMAC_CHAN_BASE(sh_dc->id) + reg);
+       return __raw_readl(sh_dc->base + reg / sizeof(u32));
+}
+
+static u16 dmaor_read(struct sh_dmae_device *shdev)
+{
+       return __raw_readw(shdev->chan_reg + DMAOR / sizeof(u32));
+}
+
+static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
+{
+       __raw_writew(data, shdev->chan_reg + DMAOR / sizeof(u32));
 }
 
 /*
@@ -69,23 +78,22 @@ static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
  *
  * SH7780 has two DMAOR register
  */
-static void sh_dmae_ctl_stop(int id)
+static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
 {
-       unsigned short dmaor = dmaor_read_reg(id);
+       unsigned short dmaor = dmaor_read(shdev);
 
-       dmaor &= ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
-       dmaor_write_reg(id, dmaor);
+       dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
 }
 
-static int sh_dmae_rst(int id)
+static int sh_dmae_rst(struct sh_dmae_device *shdev)
 {
        unsigned short dmaor;
 
-       sh_dmae_ctl_stop(id);
-       dmaor = dmaor_read_reg(id) | DMAOR_INIT;
+       sh_dmae_ctl_stop(shdev);
+       dmaor = dmaor_read(shdev) | DMAOR_INIT;
 
-       dmaor_write_reg(id, dmaor);
-       if (dmaor_read_reg(id) & (DMAOR_AE | DMAOR_NMIF)) {
+       dmaor_write(shdev, dmaor);
+       if (dmaor_read(shdev) & (DMAOR_AE | DMAOR_NMIF)) {
                pr_warning("dma-sh: Can't initialize DMAOR.\n");
                return -EINVAL;
        }
@@ -153,31 +161,20 @@ static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
        return 0;
 }
 
-#define DMARS_SHIFT    8
-#define DMARS_CHAN_MSK 0x01
 static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
 {
-       u32 addr;
-       int shift = 0;
+       struct sh_dmae_device *shdev = container_of(sh_chan->common.device,
+                                               struct sh_dmae_device, common);
+       struct sh_dmae_pdata *pdata = shdev->pdata;
+       struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id];
+       u16 __iomem *addr = shdev->dmars + chan_pdata->dmars / sizeof(u16);
+       int shift = chan_pdata->dmars_bit;
 
        if (dmae_is_busy(sh_chan))
                return -EBUSY;
 
-       if (sh_chan->id & DMARS_CHAN_MSK)
-               shift = DMARS_SHIFT;
-
-       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) & (0xFF00 >> shift)), addr);
+       __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
+                    addr);
 
        return 0;
 }
@@ -251,15 +248,15 @@ static struct sh_dmae_slave_config *sh_dmae_find_slave(
        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;
+       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;
+       for (i = 0; i < pdata->slave_num; i++)
+               if (pdata->slave[i].slave_id == slave_id)
+                       return pdata->slave + i;
 
        return NULL;
 }
@@ -757,9 +754,7 @@ static irqreturn_t sh_dmae_err(int irq, void *data)
        int i;
 
        /* halt the dma controller */
-       sh_dmae_ctl_stop(0);
-       if (shdev->pdata.mode & SHDMA_DMAOR1)
-               sh_dmae_ctl_stop(1);
+       sh_dmae_ctl_stop(shdev);
 
        /* We cannot detect, which channel caused the error, have to reset all */
        for (i = 0; i < MAX_DMA_CHANNELS; i++) {
@@ -778,9 +773,7 @@ static irqreturn_t sh_dmae_err(int irq, void *data)
                        list_splice_init(&sh_chan->ld_queue, &sh_chan->ld_free);
                }
        }
-       sh_dmae_rst(0);
-       if (shdev->pdata.mode & SHDMA_DMAOR1)
-               sh_dmae_rst(1);
+       sh_dmae_rst(shdev);
 
        return IRQ_HANDLED;
 }
@@ -813,19 +806,12 @@ static void dmae_do_tasklet(unsigned long data)
        sh_dmae_chan_ld_cleanup(sh_chan, false);
 }
 
-static unsigned int get_dmae_irq(unsigned int id)
-{
-       unsigned int irq = 0;
-       if (id < ARRAY_SIZE(dmte_irq_map))
-               irq = dmte_irq_map[id];
-       return irq;
-}
-
-static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id)
+static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
+                                       int irq, unsigned long flags)
 {
        int err;
-       unsigned int irq = get_dmae_irq(id);
-       unsigned long irqflags = IRQF_DISABLED;
+       struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
+       struct platform_device *pdev = to_platform_device(shdev->common.dev);
        struct sh_dmae_chan *new_sh_chan;
 
        /* alloc channel */
@@ -838,6 +824,8 @@ static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id)
 
        new_sh_chan->dev = shdev->common.dev;
        new_sh_chan->id = id;
+       new_sh_chan->irq = irq;
+       new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
 
        /* Init DMA tasklet */
        tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
@@ -860,21 +848,15 @@ static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id)
                        &shdev->common.channels);
        shdev->common.chancnt++;
 
-       if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
-               irqflags = IRQF_SHARED;
-#if defined(DMTE6_IRQ)
-               if (irq >= DMTE6_IRQ)
-                       irq = DMTE6_IRQ;
-               else
-#endif
-                       irq = DMTE0_IRQ;
-       }
-
-       snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
-                "sh-dmae%d", new_sh_chan->id);
+       if (pdev->id >= 0)
+               snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
+                        "sh-dmae%d.%d", pdev->id, new_sh_chan->id);
+       else
+               snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
+                        "sh-dma%d", new_sh_chan->id);
 
        /* set up channel irq */
-       err = request_irq(irq, &sh_dmae_interrupt, irqflags,
+       err = request_irq(irq, &sh_dmae_interrupt, flags,
                          new_sh_chan->dev_id, new_sh_chan);
        if (err) {
                dev_err(shdev->common.dev, "DMA channel %d request_irq error "
@@ -898,12 +880,12 @@ static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
 
        for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
                if (shdev->chan[i]) {
-                       struct sh_dmae_chan *shchan = shdev->chan[i];
-                       if (!(shdev->pdata.mode & SHDMA_MIX_IRQ))
-                               free_irq(dmte_irq_map[i], shchan);
+                       struct sh_dmae_chan *sh_chan = shdev->chan[i];
+
+                       free_irq(sh_chan->irq, sh_chan);
 
-                       list_del(&shchan->common.device_node);
-                       kfree(shchan);
+                       list_del(&sh_chan->common.device_node);
+                       kfree(sh_chan);
                        shdev->chan[i] = NULL;
                }
        }
@@ -912,47 +894,81 @@ static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
 
 static int __init sh_dmae_probe(struct platform_device *pdev)
 {
-       int err = 0, cnt, ecnt;
-       unsigned long irqflags = IRQF_DISABLED;
-#if defined(CONFIG_CPU_SH4)
-       int eirq[] = { DMAE0_IRQ,
-#if defined(DMAE1_IRQ)
-                       DMAE1_IRQ
-#endif
-               };
-#endif
+       struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
+       unsigned long irqflags = IRQF_DISABLED,
+               chan_flag[MAX_DMA_CHANNELS] = {};
+       int errirq, chan_irq[MAX_DMA_CHANNELS];
+       int err, i, irq_cnt = 0, irqres = 0;
        struct sh_dmae_device *shdev;
+       struct resource *chan, *dmars, *errirq_res, *chanirq_res;
 
        /* get platform data */
-       if (!pdev->dev.platform_data)
+       if (!pdata || !pdata->channel_num)
                return -ENODEV;
 
+       chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       /* DMARS area is optional, if absent, this controller cannot do slave DMA */
+       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;
+
+       if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) {
+               dev_err(&pdev->dev, "DMAC register region already claimed\n");
+               return -EBUSY;
+       }
+
+       if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) {
+               dev_err(&pdev->dev, "DMAC DMARS region already claimed\n");
+               err = -EBUSY;
+               goto ermrdmars;
+       }
+
+       err = -ENOMEM;
        shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
        if (!shdev) {
-               dev_err(&pdev->dev, "No enough memory\n");
-               return -ENOMEM;
+               dev_err(&pdev->dev, "Not enough memory\n");
+               goto ealloc;
+       }
+
+       shdev->chan_reg = ioremap(chan->start, resource_size(chan));
+       if (!shdev->chan_reg)
+               goto emapchan;
+       if (dmars) {
+               shdev->dmars = ioremap(dmars->start, resource_size(dmars));
+               if (!shdev->dmars)
+                       goto emapdmars;
        }
 
        /* platform data */
-       memcpy(&shdev->pdata, pdev->dev.platform_data,
-                       sizeof(struct sh_dmae_pdata));
+       shdev->pdata = pdata;
 
        /* reset dma controller */
-       err = sh_dmae_rst(0);
+       err = sh_dmae_rst(shdev);
        if (err)
                goto rst_err;
 
-       /* SH7780/85/23 has DMAOR1 */
-       if (shdev->pdata.mode & SHDMA_DMAOR1) {
-               err = sh_dmae_rst(1);
-               if (err)
-                       goto rst_err;
-       }
-
        INIT_LIST_HEAD(&shdev->common.channels);
 
        dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
-       dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
+       if (dmars)
+               dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
 
        shdev->common.device_alloc_chan_resources
                = sh_dmae_alloc_chan_resources;
@@ -970,30 +986,63 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
        shdev->common.copy_align = 5;
 
 #if defined(CONFIG_CPU_SH4)
-       /* Non Mix IRQ mode SH7722/SH7730 etc... */
-       if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
+       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;
-               eirq[0] = DMTE0_IRQ;
-#if defined(DMTE6_IRQ) && defined(DMAE1_IRQ)
-               eirq[1] = DMTE6_IRQ;
-#endif
+
+       errirq = errirq_res->start;
+
+       err = request_irq(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;
        }
 
-       for (ecnt = 0 ; ecnt < ARRAY_SIZE(eirq); ecnt++) {
-               err = request_irq(eirq[ecnt], sh_dmae_err, irqflags,
-                                 "DMAC Address Error", shdev);
-               if (err) {
-                       dev_err(&pdev->dev, "DMA device request_irq"
-                               "error (irq %d) with return %d\n",
-                               eirq[ecnt], err);
-                       goto eirq_err;
+#else
+       chanirq_res = errirq_res;
+#endif /* CONFIG_CPU_SH4 */
+
+       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++) {
+                       chan_irq[irq_cnt] = chanirq_res->start;
+                       chan_flag[irq_cnt] = IRQF_SHARED;
                }
+       } else {
+               do {
+                       for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
+                               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;
+                       }
+                       chanirq_res = platform_get_resource(pdev,
+                                               IORESOURCE_IRQ, ++irqres);
+               } while (irq_cnt < pdata->channel_num && chanirq_res);
        }
-#endif /* CONFIG_CPU_SH4 */
+
+       if (irq_cnt < pdata->channel_num)
+               goto eirqres;
 
        /* Create DMA Channel */
-       for (cnt = 0 ; cnt < MAX_DMA_CHANNELS ; cnt++) {
-               err = sh_dmae_chan_probe(shdev, cnt);
+       for (i = 0; i < pdata->channel_num; i++) {
+               err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
                if (err)
                        goto chan_probe_err;
        }
@@ -1005,13 +1054,23 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
 
 chan_probe_err:
        sh_dmae_chan_remove(shdev);
-
+eirqres:
+#if defined(CONFIG_CPU_SH4)
+       free_irq(errirq, shdev);
 eirq_err:
-       for (ecnt-- ; ecnt >= 0; ecnt--)
-               free_irq(eirq[ecnt], shdev);
-
+#endif
 rst_err:
+       if (dmars)
+               iounmap(shdev->dmars);
+emapdmars:
+       iounmap(shdev->chan_reg);
+emapchan:
        kfree(shdev);
+ealloc:
+       if (dmars)
+               release_mem_region(dmars->start, resource_size(dmars));
+ermrdmars:
+       release_mem_region(chan->start, resource_size(chan));
 
        return err;
 }
@@ -1019,36 +1078,37 @@ rst_err:
 static int __exit sh_dmae_remove(struct platform_device *pdev)
 {
        struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
+       struct resource *res;
+       int errirq = platform_get_irq(pdev, 0);
 
        dma_async_device_unregister(&shdev->common);
 
-       if (shdev->pdata.mode & SHDMA_MIX_IRQ) {
-               free_irq(DMTE0_IRQ, shdev);
-#if defined(DMTE6_IRQ)
-               free_irq(DMTE6_IRQ, shdev);
-#endif
-       }
+       if (errirq > 0)
+               free_irq(errirq, shdev);
 
        /* channel data remove */
        sh_dmae_chan_remove(shdev);
 
-       if (!(shdev->pdata.mode & SHDMA_MIX_IRQ)) {
-               free_irq(DMAE0_IRQ, shdev);
-#if defined(DMAE1_IRQ)
-               free_irq(DMAE1_IRQ, shdev);
-#endif
-       }
+       if (shdev->dmars)
+               iounmap(shdev->dmars);
+       iounmap(shdev->chan_reg);
+
        kfree(shdev);
 
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (res)
+               release_mem_region(res->start, resource_size(res));
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+       if (res)
+               release_mem_region(res->start, resource_size(res));
+
        return 0;
 }
 
 static void sh_dmae_shutdown(struct platform_device *pdev)
 {
        struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
-       sh_dmae_ctl_stop(0);
-       if (shdev->pdata.mode & SHDMA_DMAOR1)
-               sh_dmae_ctl_stop(1);
+       sh_dmae_ctl_stop(shdev);
 }
 
 static struct platform_driver sh_dmae_driver = {