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spi/pxa2xx: add support for shared IRQ handler 

This is required in case the interrupt line is shared with other
devices.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
This commit is contained in:
Sebastian Andrzej Siewior 2010-11-22 17:12:14 -08:00
parent fbd29a14af
commit 49cbb1e0b6
1 changed files with 14 additions and 1 deletions
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15
drivers/spi/pxa2xx_spi.c
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@ -742,6 +742,18 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
{ {
struct driver_data *drv_data = dev_id; struct driver_data *drv_data = dev_id;
void __iomem *reg = drv_data->ioaddr; void __iomem *reg = drv_data->ioaddr;
u32 sccr1_reg = read_SSCR1(reg);
u32 mask = drv_data->mask_sr;
u32 status;
status = read_SSSR(reg);
/* Ignore possible writes if we don't need to write */
if (!(sccr1_reg & SSCR1_TIE))
mask &= ~SSSR_TFS;
if (!(status & mask))
return IRQ_NONE;
if (!drv_data->cur_msg) { if (!drv_data->cur_msg) {
@ -1512,7 +1524,8 @@ static int __devinit pxa2xx_spi_probe(struct platform_device *pdev)
drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR; drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
} }
status = request_irq(ssp->irq, ssp_int, 0, dev_name(dev), drv_data); status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev),
drv_data);
if (status < 0) { if (status < 0) {
dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq); dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq);
goto out_error_master_alloc; goto out_error_master_alloc;