328  * GPU doorbell aperture helpers function.
331  * radeon_doorbell_init - Init doorbell driver information.
335  * Init doorbell driver information (CIK)
340 	/* doorbell bar mapping */  in radeon_doorbell_init()
341 	rdev->doorbell.base = pci_resource_start(rdev->pdev, 2);  in radeon_doorbell_init()
342 	rdev->doorbell.size = pci_resource_len(rdev->pdev, 2);  in radeon_doorbell_init()
344 	rdev->doorbell.num_doorbells = min_t(u32, rdev->doorbell.size / sizeof(u32), RADEON_MAX_DOORBELLS);  in radeon_doorbell_init()
345 	if (rdev->doorbell.num_doorbells == 0)  in radeon_doorbell_init()
348 	rdev->doorbell.ptr = ioremap(rdev->doorbell.base, rdev->doorbell.num_doorbells * sizeof(u32));  in radeon_doorbell_init()
349 	if (rdev->doorbell.ptr == NULL) {  in radeon_doorbell_init()
352 	DRM_INFO("doorbell mmio base: 0x%08X\n", (uint32_t)rdev->doorbell.base);  in radeon_doorbell_init()
353 	DRM_INFO("doorbell mmio size: %u\n", (unsigned)rdev->doorbell.size);  in radeon_doorbell_init()
355 	memset(&rdev->doorbell.used, 0, sizeof(rdev->doorbell.used));  in radeon_doorbell_init()
361  * radeon_doorbell_fini - Tear down doorbell driver information.
365  * Tear down doorbell driver information (CIK)
369 	iounmap(rdev->doorbell.ptr);  in radeon_doorbell_fini()
370 	rdev->doorbell.ptr = NULL;  in radeon_doorbell_fini()
374  * radeon_doorbell_get - Allocate a doorbell entry
377  * @doorbell: doorbell index
379  * Allocate a doorbell for use by the driver (all asics).
382 int radeon_doorbell_get(struct radeon_device *rdev, u32 *doorbell)  in radeon_doorbell_get()  argument
384 	unsigned long offset = find_first_zero_bit(rdev->doorbell.used, rdev->doorbell.num_doorbells);  in radeon_doorbell_get()
385 	if (offset < rdev->doorbell.num_doorbells) {  in radeon_doorbell_get()
386 		__set_bit(offset, rdev->doorbell.used);  in radeon_doorbell_get()
387 		*doorbell = offset;  in radeon_doorbell_get()
395  * radeon_doorbell_free - Free a doorbell entry
398  * @doorbell: doorbell index
400  * Free a doorbell allocated for use by the driver (all asics)
402 void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell)  in radeon_doorbell_free()  argument
404 	if (doorbell < rdev->doorbell.num_doorbells)  in radeon_doorbell_free()
405 		__clear_bit(doorbell, rdev->doorbell.used);  in radeon_doorbell_free()
1405 	/* doorbell bar mapping */  in radeon_device_init()