/**
* pseries_eeh_write_config - Write PCI config space
* @dn: device node
* @where: PCI address
* @size: size to write
* @val: value to be written
*
* Write config space to the specified device
*/
static int pseries_eeh_write_config(struct device_node *dn, int where, int size, u32 val)
{
struct pci_dn *pdn;
pdn = PCI_DN(dn);
return rtas_write_config(pdn, where, size, val);
}
/**
* __restore_bars - Restore the Base Address Registers
* @pdn: pci device node
*
* Loads the PCI configuration space base address registers,
* the expansion ROM base address, the latency timer, and etc.
* from the saved values in the device node.
*/
static inline void __restore_bars (struct pci_dn *pdn)
{
int i;
if (NULL==pdn->phb) return;
for (i=4; i<10; i++) {
rtas_write_config(pdn, i*4, 4, pdn->config_space[i]);
}
/* 12 == Expansion ROM Address */
rtas_write_config(pdn, 12*4, 4, pdn->config_space[12]);
#define BYTE_SWAP(OFF) (8*((OFF)/4)+3-(OFF))
#define SAVED_BYTE(OFF) (((u8 *)(pdn->config_space))[BYTE_SWAP(OFF)])
rtas_write_config (pdn, PCI_CACHE_LINE_SIZE, 1,
SAVED_BYTE(PCI_CACHE_LINE_SIZE));
rtas_write_config (pdn, PCI_LATENCY_TIMER, 1,
SAVED_BYTE(PCI_LATENCY_TIMER));
/* max latency, min grant, interrupt pin and line */
rtas_write_config(pdn, 15*4, 4, pdn->config_space[15]);
}
static int rtas_pci_write_config(struct pci_bus *bus,
unsigned int devfn,
int where, int size, u32 val)
{
struct device_node *busdn, *dn;
busdn = pci_bus_to_OF_node(bus);
/* Search only direct children of the bus */
for (dn = busdn->child; dn; dn = dn->sibling) {
struct pci_dn *pdn = PCI_DN(dn);
if (pdn && pdn->devfn == devfn
&& of_device_is_available(dn))
return rtas_write_config(pdn, where, size, val);
}
return PCIBIOS_DEVICE_NOT_FOUND;
}