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Simple PCIe FMC carrier SPEC - Software
Commit 8037b7d9 authored by Alessandro Rubini's avatar Alessandro Rubini
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setup/clear gpio interrupts at irq request/free

parent 491f3df0
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Showing with 42 additions and 2 deletions
kernel/spec-fmc.c
View file @ 8037b7d9
......@@ -21,7 +21,34 @@ module_param_named(test_irq, spec_test_irq, int, 0444);
static int spec_irq_request(struct fmc_device *fmc, irq_handler_t handler,
char *name, int flags)
{
return request_irq(fmc->irq, handler, flags, name, fmc);
struct spec_dev *spec = fmc->carrier_data;
int ret;
ret = request_irq(fmc->irq, handler, flags, name, fmc);
if (ret) return ret;
/* Enable gpio interrupts:
* gpio6: tp8: output low
* gpio7: tp7: interrupt, raising edge
* gpio8: IRQ1 from FPGA: interrupt, raising edge
* gpio9: IRQ0 from FPGA: interrupt, raising edge
* gpio10: tp6: output low
* gpio11: tp5: interrupt, raising edge
*/
/* bypass = alternate function */
gennum_mask_val(spec, 0xfc, 0x00, GNGPIO_BYPASS_MODE);
/* direction 0 = output */
gennum_mask_val(spec, 0x44, 0x00, GNGPIO_DIRECTION_MODE);
gennum_mask_val(spec, 0xb8, 0xb8, GNGPIO_DIRECTION_MODE);
gennum_mask_val(spec, 0x44, 0x44, GNGPIO_OUTPUT_ENABLE);
gennum_mask_val(spec, 0xb8, 0x00, GNGPIO_INT_TYPE); /* 0 = edge */
gennum_mask_val(spec, 0xb8, 0xb8, GNGPIO_INT_VALUE); /* 1 = raising */
gennum_mask_val(spec, 0xb8, 0x00, GNGPIO_INT_ON_ANY);
gennum_writel(spec, 0xb8, GNGPIO_INT_MASK_CLR); /* enable */
return 0;
}
static void spec_irq_ack(struct fmc_device *fmc)
......@@ -38,6 +65,9 @@ static void spec_irq_ack(struct fmc_device *fmc)
static int spec_irq_free(struct fmc_device *fmc)
{
struct spec_dev *spec = fmc->carrier_data;
gennum_writel(spec, 0xffff, GNGPIO_INT_MASK_SET); /* disable */
free_irq(fmc->irq, fmc);
return 0;
}
......@@ -68,6 +98,9 @@ static irqreturn_t spec_test_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
/*
* Finally, the real init and exit
*/
static int spec_irq_init(struct fmc_device *fmc)
{
struct spec_dev *spec = fmc->carrier_data;
......
kernel/spec.h
View file @ 8037b7d9
......@@ -104,7 +104,14 @@ static inline void gennum_writel(struct spec_dev *spec, uint32_t val, int reg)
{
writel(val, spec->remap[2] + reg);
}
static inline void gennum_mask_val(struct spec_dev *spec,
uint32_t mask, uint32_t val, int reg)
{
uint32_t v = gennum_readl(spec, reg);
v &= ~mask;
v |= val;
gennum_writel(spec, v, reg);
}
/* Functions in spec-fmc.c, used by spec-pci.c */
......
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