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add a more flexible interface to determine PCI information

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=> now, we determine also the size of the IO address space
This commit is contained in:
Stefan Lankes 2012-07-26 09:07:20 +02:00
parent bb467767d0
commit 3e01fbad68
2 changed files with 30 additions and 7 deletions
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11
arch/x86/include/asm/pci.h
View file

@ -33,6 +33,12 @@
extern "C" {
#endif
typedef struct {
uint32_t base[6];
uint32_t size[6];
uint32_t irq;
} pci_info_t;
/** @brief Initialize the PCI environment
*/
int pci_init(void);
@ -41,14 +47,13 @@ int pci_init(void);
*
* @param vendor_id The device's vendor ID
* @param device_id the device's ID
* @param iobase Pointer to a 4 byte variable where the determined IObase address will be stored
* @param irq Pointer to a 4 byte variable where the determined IRQ number will be stored
* @param info Pointer to the record pci_info_t where among other the IObase address will be stored
*
* @return
* - 0 on success
* - -EINVAL (-22) on failure
*/
int pci_get_device_info(uint32_t vendor_id, uint32_t device_id, uint32_t* iobase, uint32_t* irq);
int pci_get_device_info(uint32_t vendor_id, uint32_t device_id, pci_info_t* info);
/** @brief Print information of existing pci adapters
*

26
arch/x86/kernel/pci.c
View file

@ -103,6 +103,23 @@ static inline uint32_t pci_what_iobase(uint32_t bus, uint32_t slot)
return pci_conf_read(bus, slot, PCI_CBIO) & 0xFFFFFFFC;
}
static inline uint32_t pci_what_size(uint32_t bus, uint32_t slot)
{
uint32_t tmp, ret;
// backup the original value
tmp = pci_conf_read(bus, slot, PCI_CBIO);
// determine size
pci_conf_write(bus, slot, PCI_CBIO, 0xFFFFFFFF);
ret = ~pci_conf_read(bus, slot, PCI_CBIO) + 1;
// restore original value
pci_conf_write(bus, slot, PCI_CBIO, tmp);
return ret;
}
int pci_init(void)
{
uint32_t slot, bus;
@ -114,11 +131,11 @@ int pci_init(void)
return 0;
}
int pci_get_device_info(uint32_t vendor_id, uint32_t device_id, uint32_t* iobase, uint32_t* irq)
int pci_get_device_info(uint32_t vendor_id, uint32_t device_id, pci_info_t* info)
{
uint32_t slot, bus;
if (!iobase || !irq)
if (!info)
return -EINVAL;
if (!mechanism)
@ -129,8 +146,9 @@ int pci_get_device_info(uint32_t vendor_id, uint32_t device_id, uint32_t* iobase
if (adapters[bus][slot] != -1) {
if (((adapters[bus][slot] & 0xffff) == vendor_id) &&
(((adapters[bus][slot] & 0xffff0000) >> 16) == device_id)) {
*iobase = pci_what_iobase(bus, slot);
*irq = pci_what_irq(bus, slot);
info->base[0] = pci_what_iobase(bus, slot);
info->size[0] = pci_what_size(bus, slot);
info->irq = pci_what_irq(bus, slot);
return 0;
}
}