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added a structure to hold interrupt handler addresses for the PCI cards

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This commit is contained in:
Markus Fröschle
2013-12-17 15:59:08 +00:00
parent 2fd6cfc633
commit 51938eef49
1 changed files with 66 additions and 0 deletions
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66
BaS_gcc/sources/pci.c
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@@ -81,6 +81,17 @@ static int num_pci_classes = sizeof(pci_classes) / sizeof(struct pci_class);
#define NUM_RESOURCES 6
/* holds the handle of a card at position = array index */
static int32_t handles[NUM_CARDS];
/* holds the interrupt handler addresses (see pci_hook_interrupt() and pci_unhook_interrupt()) of the PCI cards */
struct pci_interrupt
{
void (*handler)(void);
int32_t parameter;
struct pci_interrupt *next;
};
#define MAX_INTERRUPTS (NUM_CARDS * 3)
static struct pci_interrupt interrupts[MAX_INTERRUPTS];
/* holds the card's resource descriptors; filled in pci_device_config() */
static struct pci_rd resource_descriptors[NUM_CARDS][NUM_RESOURCES];
@@ -139,6 +150,57 @@ __attribute__((interrupt)) void pci_interrupt(void)
{
}
int32_t pci_get_interrupt_cause(int32_t *handles)
{
int32_t handle;
while ((handle = *handles++) != -1)
{
uint32_t csr = swpl(pci_read_config_longword(handle, PCICSR));
if ((csr & (1 << 3)) && (csr & !(csr & (1 << 10))))
{
/* device has interrupts enabled and has an active interrupt, so its probably ours */
return handle;
}
}
debug_printf("%s: no interrupt cause found\r\n", __FUNCTION__);
return -1;
}
/*
* This gets called from irq5 in exceptions.S
* Once we arrive here, the SR has been set to disable interrupts and the gcc scratch registers have been saved
*/
void irq5_handler(void)
{
int32_t handle;
MCF_EPORT_EPFR |= (1 << 5); /* clear interrupt from edge port */
xprintf("IRQ5!\r\n");
if ((handle = pci_get_interrupt_cause(handles)) > 0)
{
;
}
}
/*
* This gets called from irq7 in exceptions.S
* Once we arrive here, the SR has been set to disable interrupts and the gcc scratch registers have been saved
*/
void irq7_handler(void)
{
int32_t handle;
MCF_EPORT_EPFR |= (1 << 7);
debug_printf("IRQ7!\r\n");
if ((handle = pci_get_interrupt_cause(handles)) > 0)
{
;
}
}
/*
* retrieve handle for i'th device
*/
@@ -569,6 +631,8 @@ static void pci_device_config(uint16_t bus, uint16_t device, uint16_t function)
/* if so, register interrupts */
/* TODO: register interrupts here */
/*
* enable device memory or I/O access
*/
@@ -799,6 +863,8 @@ void init_pci(void)
memset(&resource_descriptors, 0, NUM_CARDS * NUM_RESOURCES * sizeof(struct pci_rd));
/* initialize/clear handles array */
memset(handles, 0, NUM_CARDS * sizeof(int32_t));
/* initialize/clear interrupts array */
memset(interrupts, 0, MAX_INTERRUPTS * sizeof(struct pci_interrupt));
/*
* do normal initialization