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Commit 4f723df4 authored by Martyn Welch's avatar Martyn Welch Committed by Greg Kroah-Hartman
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Staging: vme: Attribute Testing For Dma Request 



Check the directions in which the DMA controller is expected to operate
before giving control of a resource.

Signed-off-by: default avatarMartyn Welch <martyn.welch@gefanuc.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 66bd8db5

drivers/staging/vme/TODO

+0 −22
Original line number Diff line number Diff line
@@ -4,28 +4,6 @@ 
API

===



DMA Resource Allocation incomplete

----------------------------------



The current DMA resource Allocation provides no means of selecting the

suitability of a DMA controller based on it's supported modes of operation, as

opposed to the resource allocation mechanisms for master and slave windows:



	struct vme_resource *vme_dma_request(struct device *dev);



As opposed to:



	struct vme_resource * vme_master_request(struct device *dev,

		vme_address_t aspace, vme_cycle_t cycle, vme_width_t width);



The TSI148 can perform, VME-to-PCI, PCI-to-VME, PATTERN-to-VME, PATTERN-to-PCI,

VME-to-VME and PCI-to-PCI transfers. The CA91C142 can only provide VME-to-PCI

and PCI-to-VME.



Add a mechanism to select a VME controller based on source/target type,

required aspace, cycle and width requirements.





Master window broadcast select mask

-----------------------------------

drivers/staging/vme/bridges/vme_ca91cx42.c

+2 −0
Original line number Diff line number Diff line
@@ -1109,6 +1109,8 @@ static int ca91cx42_probe(struct pci_dev *pdev, const struct pci_device_id *id) 
		mutex_init(&(dma_ctrlr->mtx));

		dma_ctrlr->locked = 0;

		dma_ctrlr->number = i;

		dma_ctrlr->route_attr = VME_DMA_VME_TO_MEM |

			VME_DMA_MEM_TO_VME;

		INIT_LIST_HEAD(&(dma_ctrlr->pending));

		INIT_LIST_HEAD(&(dma_ctrlr->running));

		list_add_tail(&(dma_ctrlr->list),

drivers/staging/vme/bridges/vme_tsi148.c

+4 −0
Original line number Diff line number Diff line
@@ -2421,6 +2421,10 @@ static int tsi148_probe(struct pci_dev *pdev, const struct pci_device_id *id) 
		mutex_init(&(dma_ctrlr->mtx));

		dma_ctrlr->locked = 0;

		dma_ctrlr->number = i;

		dma_ctrlr->route_attr = VME_DMA_VME_TO_MEM |

			VME_DMA_MEM_TO_VME | VME_DMA_VME_TO_VME |

			VME_DMA_MEM_TO_MEM | VME_DMA_PATTERN_TO_VME |

			VME_DMA_PATTERN_TO_MEM;

		INIT_LIST_HEAD(&(dma_ctrlr->pending));

		INIT_LIST_HEAD(&(dma_ctrlr->running));

		list_add_tail(&(dma_ctrlr->list),

drivers/staging/vme/vme.c

+5 −3
Original line number Diff line number Diff line
@@ -643,7 +643,7 @@ EXPORT_SYMBOL(vme_master_free); 
 * Request a DMA controller with specific attributes, return some unique

 * identifier.

 */

struct vme_resource *vme_dma_request(struct device *dev)

struct vme_resource *vme_dma_request(struct device *dev, vme_dma_route_t route)

{

	struct vme_bridge *bridge;

	struct list_head *dma_pos = NULL;
@@ -670,9 +670,11 @@ struct vme_resource *vme_dma_request(struct device *dev) 
			continue;

		}



		/* Find an unlocked controller */

		/* Find an unlocked and compatible controller */

		mutex_lock(&(dma_ctrlr->mtx));

		if (dma_ctrlr->locked == 0) {

		if (((dma_ctrlr->route_attr & route) == route) &&

			(dma_ctrlr->locked == 0)) {



			dma_ctrlr->locked = 1;

			mutex_unlock(&(dma_ctrlr->mtx));

			allocated_ctrlr = dma_ctrlr;

drivers/staging/vme/vme.h

+9 −1
Original line number Diff line number Diff line
@@ -68,6 +68,14 @@ typedef u32 vme_pattern_t; 
#define VME_DMA_PATTERN_WORD		(1<<1)

#define VME_DMA_PATTERN_INCREMENT	(1<<2)



typedef u32 vme_dma_route_t;

#define VME_DMA_VME_TO_MEM		(1<<0)

#define VME_DMA_MEM_TO_VME		(1<<1)

#define VME_DMA_VME_TO_VME		(1<<2)

#define VME_DMA_MEM_TO_MEM		(1<<3)

#define VME_DMA_PATTERN_TO_VME		(1<<4)

#define VME_DMA_PATTERN_TO_MEM		(1<<5)



struct vme_dma_attr {

	vme_dma_t type;

	void *private;
@@ -124,7 +132,7 @@ unsigned int vme_master_rmw(struct vme_resource *, unsigned int, unsigned int, 
	unsigned int, loff_t);

void vme_master_free(struct vme_resource *);



struct vme_resource *vme_dma_request(struct device *);

struct vme_resource *vme_dma_request(struct device *, vme_dma_route_t);

struct vme_dma_list *vme_new_dma_list(struct vme_resource *);

struct vme_dma_attr *vme_dma_pattern_attribute(u32, vme_pattern_t);

struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t);