ARM: OMAP: Fix DMA channel irq handling for omap24xx

- DMA CSR register is cleared by reading on omap1, but on
  omap2 it is cleard by writing to it.

- DMA TOUT interrupt does not exist on omap24xx, rename it

- Add SECURE and MISALIGNED errors by default for omap24xx

- Add defines for external DMA request lines

Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 22 insertions, 15 deletions

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 8e7c33656b52..c5d0214ef191 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -43,6 +43,7 @@
 
 #define OMAP_DMA_ACTIVE         0x01
 #define OMAP_DMA_CCR_EN         (1 << 7)
+#define OMAP2_DMA_CSR_CLEAR_MASK        0xffe
 
 #define OMAP_FUNC_MUX_ARM_BASE  (0xfffe1000 + 0xec)
 
@@ -409,8 +410,11 @@ static inline void omap_enable_channel_irq(int lch)
 {
         u32 status;
 
-        /* Read CSR to make sure it's cleared. */
-        status = OMAP_DMA_CSR_REG(lch);
+        /* Clear CSR */
+        if (cpu_class_is_omap1())
+                status = OMAP_DMA_CSR_REG(lch);
+        else if (cpu_is_omap24xx())
+                OMAP_DMA_CSR_REG(lch) = OMAP2_DMA_CSR_CLEAR_MASK;
 
         /* Enable some nice interrupts. */
         OMAP_DMA_CICR_REG(lch) = dma_chan[lch].enabled_irqs;
@@ -509,11 +513,13 @@ int omap_request_dma(int dev_id, const char *dev_name,
         chan->dev_name = dev_name;
         chan->callback = callback;
         chan->data = data;
-        chan->enabled_irqs = OMAP_DMA_TOUT_IRQ | OMAP_DMA_DROP_IRQ |
-                                OMAP_DMA_BLOCK_IRQ;
+        chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 
-        if (cpu_is_omap24xx())
-                chan->enabled_irqs |= OMAP2_DMA_TRANS_ERR_IRQ;
+        if (cpu_class_is_omap1())
+                chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
+        else if (cpu_is_omap24xx())
+                chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
+                        OMAP2_DMA_TRANS_ERR_IRQ;
 
         if (cpu_is_omap16xx()) {
                 /* If the sync device is set, configure it dynamically. */
@@ -533,7 +539,7 @@ int omap_request_dma(int dev_id, const char *dev_name,
 
                 omap_enable_channel_irq(free_ch);
                 /* Clear the CSR register and IRQ status register */
-                OMAP_DMA_CSR_REG(free_ch) = 0x0;
+                OMAP_DMA_CSR_REG(free_ch) = OMAP2_DMA_CSR_CLEAR_MASK;
                 omap_writel(~0x0, OMAP_DMA4_IRQSTATUS_L0);
         }
 
@@ -573,7 +579,7 @@ void omap_free_dma(int lch)
                 omap_writel(val, OMAP_DMA4_IRQENABLE_L0);
 
                 /* Clear the CSR register and IRQ status register */
-                OMAP_DMA_CSR_REG(lch) = 0x0;
+                OMAP_DMA_CSR_REG(lch) = OMAP2_DMA_CSR_CLEAR_MASK;
 
                 val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
                 val |= 1 << lch;
@@ -837,7 +843,7 @@ static int omap1_dma_handle_ch(int ch)
                        "%d (CSR %04x)\n", ch, csr);
                 return 0;
         }
-        if (unlikely(csr & OMAP_DMA_TOUT_IRQ))
+        if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
                 printk(KERN_WARNING "DMA timeout with device %d\n",
                        dma_chan[ch].dev_id);
         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
@@ -885,20 +891,21 @@ static int omap2_dma_handle_ch(int ch)
                 return 0;
         if (unlikely(dma_chan[ch].dev_id == -1))
                 return 0;
-        /* REVISIT: According to 24xx TRM, there's no TOUT_IE */
-        if (unlikely(status & OMAP_DMA_TOUT_IRQ))
-                printk(KERN_INFO "DMA timeout with device %d\n",
-                       dma_chan[ch].dev_id);
         if (unlikely(status & OMAP_DMA_DROP_IRQ))
                 printk(KERN_INFO
                        "DMA synchronization event drop occurred with device "
                        "%d\n", dma_chan[ch].dev_id);
-
         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ))
                 printk(KERN_INFO "DMA transaction error with device %d\n",
                        dma_chan[ch].dev_id);
+        if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
+                printk(KERN_INFO "DMA secure error with device %d\n",
+                       dma_chan[ch].dev_id);
+        if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
+                printk(KERN_INFO "DMA misaligned error with device %d\n",
+                       dma_chan[ch].dev_id);
 
-        OMAP_DMA_CSR_REG(ch) = 0x20;
+        OMAP_DMA_CSR_REG(ch) = OMAP2_DMA_CSR_CLEAR_MASK;
 
         val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
         /* ch in this function is from 0-31 while in register it is 1-32 */