1 files changed, 24 insertions, 4 deletions

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 47ec77af4ccb..21cc0142b97a 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -123,6 +123,7 @@ static struct dma_link_info *dma_linked_lch;
 
 static int dma_lch_count;
 static int dma_chan_count;
+static int omap_dma_reserve_channels;
 
 static spinlock_t dma_chan_lock;
 static struct omap_dma_lch *dma_chan;
@@ -737,7 +738,7 @@ int omap_request_dma(int dev_id, const char *dev_name,
                  * id.
                  */
                 dma_write(dev_id | (1 << 10), CCR(free_ch));
-        } else if (cpu_is_omap730() || cpu_is_omap15xx()) {
+        } else if (cpu_is_omap7xx() || cpu_is_omap15xx()) {
                 dma_write(dev_id, CCR(free_ch));
         }
 
@@ -1900,7 +1901,7 @@ static int omap2_dma_handle_ch(int ch)
 /* STATUS register count is from 1-32 while our is 0-31 */
 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
 {
-        u32 val;
+        u32 val, enable_reg;
         int i;
 
         val = dma_read(IRQSTATUS_L0);
@@ -1909,6 +1910,8 @@ static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
                         printk(KERN_WARNING "Spurious DMA IRQ\n");
                 return IRQ_HANDLED;
         }
+        enable_reg = dma_read(IRQENABLE_L0);
+        val &= enable_reg; /* Dispatch only relevant interrupts */
         for (i = 0; i < dma_lch_count && val != 0; i++) {
                 if (val & 1)
                         omap2_dma_handle_ch(i);
@@ -2321,6 +2324,10 @@ static int __init omap_init_dma(void)
                 return -ENODEV;
         }
 
+        if (cpu_class_is_omap2() && omap_dma_reserve_channels
+                        && (omap_dma_reserve_channels <= dma_lch_count))
+                dma_lch_count = omap_dma_reserve_channels;
+
         dma_chan = kzalloc(sizeof(struct omap_dma_lch) * dma_lch_count,
                                 GFP_KERNEL);
         if (!dma_chan)
@@ -2339,7 +2346,7 @@ static int __init omap_init_dma(void)
                 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
                 dma_chan_count = 9;
                 enable_1510_mode = 1;
-        } else if (cpu_is_omap16xx() || cpu_is_omap730()) {
+        } else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
                 printk(KERN_INFO "OMAP DMA hardware version %d\n",
                        dma_read(HW_ID));
                 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
@@ -2371,7 +2378,7 @@ static int __init omap_init_dma(void)
                 u8 revision = dma_read(REVISION) & 0xff;
                 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
                        revision >> 4, revision & 0xf);
-                dma_chan_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
+                dma_chan_count = dma_lch_count;
         } else {
                 dma_chan_count = 0;
                 return 0;
@@ -2437,4 +2444,17 @@ static int __init omap_init_dma(void)
 
 arch_initcall(omap_init_dma);
 
+/*
+ * Reserve the omap SDMA channels using cmdline bootarg
+ * "omap_dma_reserve_ch=". The valid range is 1 to 32
+ */
+static int __init omap_dma_cmdline_reserve_ch(char *str)
+{
+        if (get_option(&str, &omap_dma_reserve_channels) != 1)
+                omap_dma_reserve_channels = 0;
+        return 1;
+}
+
+__setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
+