static int kempld_get_info_generic(struct kempld_device_data *pld)
{
u16 version;
u8 spec;
kempld_get_mutex(pld);
version = kempld_read16(pld, KEMPLD_VERSION);
spec = kempld_read8(pld, KEMPLD_SPEC);
pld->info.buildnr = kempld_read16(pld, KEMPLD_BUILDNR);
pld->info.minor = KEMPLD_VERSION_GET_MINOR(version);
pld->info.major = KEMPLD_VERSION_GET_MAJOR(version);
pld->info.number = KEMPLD_VERSION_GET_NUMBER(version);
pld->info.type = KEMPLD_VERSION_GET_TYPE(version);
if (spec == 0xff) {
pld->info.spec_minor = 0;
pld->info.spec_major = 1;
} else {
pld->info.spec_minor = KEMPLD_SPEC_GET_MINOR(spec);
pld->info.spec_major = KEMPLD_SPEC_GET_MAJOR(spec);
}
if (pld->info.spec_major > 0)
pld->feature_mask = kempld_read16(pld, KEMPLD_FEATURE);
else
pld->feature_mask = 0;
kempld_release_mutex(pld);
return 0;
}
static int kempld_gpio_pincount(struct kempld_device_data *pld)
{
u16 evt, evt_back;
kempld_get_mutex(pld);
/* Backup event register as it might be already initialized */
evt_back = kempld_read16(pld, KEMPLD_GPIO_EVT_LVL_EDGE);
/* Clear event register */
kempld_write16(pld, KEMPLD_GPIO_EVT_LVL_EDGE, 0x0000);
/* Read back event register */
evt = kempld_read16(pld, KEMPLD_GPIO_EVT_LVL_EDGE);
/* Restore event register */
kempld_write16(pld, KEMPLD_GPIO_EVT_LVL_EDGE, evt_back);
kempld_release_mutex(pld);
return evt ? __ffs(evt) : 16;
}
/**
* kempld_read32 - read 32 bit register
* @pld: kempld_device_data structure describing the PLD
* @index: register index on the chip
*
* kempld_get_mutex must be called prior to calling this function.
*/
u32 kempld_read32(struct kempld_device_data *pld, u8 index)
{
return kempld_read16(pld, index) | kempld_read16(pld, index + 2) << 16;
}