spi/dw_spi: Allow interrupt sharing

Allow interrupt sharing since exclusive interrupt line for
DW SPI controller is not provided on every platform.

Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c
index d256cb0..11fbbf6 100644 (file)
--- a/drivers/spi/dw_spi.c
+++ b/drivers/spi/dw_spi.c
@@ -396,6 +396,11 @@ static irqreturn_t interrupt_transfer(struct dw_spi *dws)
 static irqreturn_t dw_spi_irq(int irq, void *dev_id)
 {
        struct dw_spi *dws = dev_id;
+       u16 irq_status, irq_mask = 0x3f;
+
+       irq_status = dw_readw(dws, isr) & irq_mask;
+       if (!irq_status)
+               return IRQ_NONE;
 
        if (!dws->cur_msg) {
                spi_mask_intr(dws, SPI_INT_TXEI);
@@ -883,7 +888,7 @@ int __devinit dw_spi_add_host(struct dw_spi *dws)
        dws->dma_inited = 0;
        dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60);
 
-       ret = request_irq(dws->irq, dw_spi_irq, 0,
+       ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED,
                        "dw_spi", dws);
        if (ret < 0) {
                dev_err(&master->dev, "can not get IRQ\n");