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Commit 0703ed2a authored by Russell King's avatar Russell King
Browse files

ARM: dmabounce: get rid of dma_needs_bounce global function 



Pass the device type specific needs_bounce function in at dmabounce
register time, avoiding the need for a platform specific global
function to do this.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent c289b2e0

arch/arm/common/dmabounce.c

+6 −2
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ struct dmabounce_device_info { 
	struct dmabounce_pool	large;



	rwlock_t lock;



	int (*needs_bounce)(struct device *, dma_addr_t, size_t);

};



#ifdef STATS
@@ -236,7 +238,7 @@ static int needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size) 
			return 1;

	}



	return dma_needs_bounce(dev, dma_addr, size) ? 1 : 0;

	return !!dev->archdata.dmabounce->needs_bounce(dev, dma_addr, size);

}



static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
@@ -430,7 +432,8 @@ static int dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev, 
}



int dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size,

		unsigned long large_buffer_size)

		unsigned long large_buffer_size,

		int (*needs_bounce_fn)(struct device *, dma_addr_t, size_t))

{

	struct dmabounce_device_info *device_info;

	int ret;
@@ -466,6 +469,7 @@ int dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size, 
	device_info->dev = dev;

	INIT_LIST_HEAD(&device_info->safe_buffers);

	rwlock_init(&device_info->lock);

	device_info->needs_bounce = needs_bounce_fn;



#ifdef STATS

	device_info->total_allocs = 0;

arch/arm/common/it8152.c

+8 −9
Original line number Diff line number Diff line
@@ -243,6 +243,13 @@ static struct resource it8152_mem = { 
 * ITE8152 chip can address up to 64MByte, so all the devices

 * connected to ITE8152 (PCI and USB) should have limited DMA window

 */

static int it8152_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)

{

	dev_dbg(dev, "%s: dma_addr %08x, size %08x\n",

		__func__, dma_addr, size);

	return dev->bus == &pci_bus_type &&

		(dma_addr + size - PHYS_OFFSET) >= SZ_64M;

}



/*

 * Setup DMA mask to 64MB on devices connected to ITE8152. Ignore all
@@ -254,7 +261,7 @@ static int it8152_pci_platform_notify(struct device *dev) 
		if (dev->dma_mask)

			*dev->dma_mask = (SZ_64M - 1) | PHYS_OFFSET;

		dev->coherent_dma_mask = (SZ_64M - 1) | PHYS_OFFSET;

		dmabounce_register_dev(dev, 2048, 4096);

		dmabounce_register_dev(dev, 2048, 4096, it8152_needs_bounce);

	}

	return 0;

}
@@ -267,14 +274,6 @@ static int it8152_pci_platform_notify_remove(struct device *dev) 
	return 0;

}



int dma_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)

{

	dev_dbg(dev, "%s: dma_addr %08x, size %08x\n",

		__func__, dma_addr, size);

	return (dev->bus == &pci_bus_type) &&

		((dma_addr + size - PHYS_OFFSET) >= SZ_64M);

}



int dma_set_coherent_mask(struct device *dev, u64 mask)

{

	if (mask >= PHYS_OFFSET + SZ_64M - 1)

arch/arm/common/sa1111.c

+31 −29
Original line number Diff line number Diff line
@@ -579,7 +579,36 @@ sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac, 


	sachip->dev->coherent_dma_mask &= sa1111_dma_mask[drac >> 2];

}

#endif



#ifdef CONFIG_DMABOUNCE

/*

 * According to the "Intel StrongARM SA-1111 Microprocessor Companion

 * Chip Specification Update" (June 2000), erratum #7, there is a

 * significant bug in the SA1111 SDRAM shared memory controller.  If

 * an access to a region of memory above 1MB relative to the bank base,

 * it is important that address bit 10 _NOT_ be asserted. Depending

 * on the configuration of the RAM, bit 10 may correspond to one

 * of several different (processor-relative) address bits.

 *

 * This routine only identifies whether or not a given DMA address

 * is susceptible to the bug.

 *

 * This should only get called for sa1111_device types due to the

 * way we configure our device dma_masks.

 */

static int sa1111_needs_bounce(struct device *dev, dma_addr_t addr, size_t size)

{

	/*

	 * Section 4.6 of the "Intel StrongARM SA-1111 Development Module

	 * User's Guide" mentions that jumpers R51 and R52 control the

	 * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or

	 * SDRAM bank 1 on Neponset). The default configuration selects

	 * Assabet, so any address in bank 1 is necessarily invalid.

	 */

	return (machine_is_assabet() || machine_is_pfs168()) &&

		(addr >= 0xc8000000 || (addr + size) >= 0xc8000000);

}

#endif



static void sa1111_dev_release(struct device *_dev)
@@ -644,7 +673,8 @@ sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent, 
		dev->dev.dma_mask = &dev->dma_mask;



		if (dev->dma_mask != 0xffffffffUL) {

			ret = dmabounce_register_dev(&dev->dev, 1024, 4096);

			ret = dmabounce_register_dev(&dev->dev, 1024, 4096,

					sa1111_needs_bounce);

			if (ret) {

				dev_err(&dev->dev, "SA1111: Failed to register"

					" with dmabounce\n");
@@ -818,34 +848,6 @@ static void __sa1111_remove(struct sa1111 *sachip) 
	kfree(sachip);

}



/*

 * According to the "Intel StrongARM SA-1111 Microprocessor Companion

 * Chip Specification Update" (June 2000), erratum #7, there is a

 * significant bug in the SA1111 SDRAM shared memory controller.  If

 * an access to a region of memory above 1MB relative to the bank base,

 * it is important that address bit 10 _NOT_ be asserted. Depending

 * on the configuration of the RAM, bit 10 may correspond to one

 * of several different (processor-relative) address bits.

 *

 * This routine only identifies whether or not a given DMA address

 * is susceptible to the bug.

 *

 * This should only get called for sa1111_device types due to the

 * way we configure our device dma_masks.

 */

int dma_needs_bounce(struct device *dev, dma_addr_t addr, size_t size)

{

	/*

	 * Section 4.6 of the "Intel StrongARM SA-1111 Development Module

	 * User's Guide" mentions that jumpers R51 and R52 control the

	 * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or

	 * SDRAM bank 1 on Neponset). The default configuration selects

	 * Assabet, so any address in bank 1 is necessarily invalid.

	 */

	return ((machine_is_assabet() || machine_is_pfs168()) &&

		(addr >= 0xc8000000 || (addr + size) >= 0xc8000000));

}



struct sa1111_save_data {

	unsigned int	skcr;

	unsigned int	skpcr;

arch/arm/include/asm/dma-mapping.h

+2 −20
Original line number Diff line number Diff line
@@ -256,14 +256,14 @@ int dma_mmap_writecombine(struct device *, struct vm_area_struct *, 
 * @dev: valid struct device pointer

 * @small_buf_size: size of buffers to use with small buffer pool

 * @large_buf_size: size of buffers to use with large buffer pool (can be 0)

 * @needs_bounce_fn: called to determine whether buffer needs bouncing

 *

 * This function should be called by low-level platform code to register

 * a device as requireing DMA buffer bouncing. The function will allocate

 * appropriate DMA pools for the device.

 *

 */

extern int dmabounce_register_dev(struct device *, unsigned long,

		unsigned long);

		unsigned long, int (*)(struct device *, dma_addr_t, size_t));



/**

 * dmabounce_unregister_dev
@@ -277,24 +277,6 @@ extern int dmabounce_register_dev(struct device *, unsigned long, 
 */

extern void dmabounce_unregister_dev(struct device *);



/**

 * dma_needs_bounce

 *

 * @dev: valid struct device pointer

 * @dma_handle: dma_handle of unbounced buffer

 * @size: size of region being mapped

 *

 * Platforms that utilize the dmabounce mechanism must implement

 * this function.

 *

 * The dmabounce routines call this function whenever a dma-mapping

 * is requested to determine whether a given buffer needs to be bounced

 * or not. The function must return 0 if the buffer is OK for

 * DMA access and 1 if the buffer needs to be bounced.

 *

 */

extern int dma_needs_bounce(struct device*, dma_addr_t, size_t);



/*

 * The DMA API, implemented by dmabounce.c.  See below for descriptions.

 */

arch/arm/mach-ixp4xx/common-pci.c

+6 −6
Original line number Diff line number Diff line
@@ -316,6 +316,11 @@ static int abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *r 
}





static int ixp4xx_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)

{

	return dev->bus == &pci_bus_type && (dma_addr + size) >= SZ_64M;

}



/*

 * Setup DMA mask to 64MB on PCI devices. Ignore all other devices.

 */
@@ -324,7 +329,7 @@ static int ixp4xx_pci_platform_notify(struct device *dev) 
	if(dev->bus == &pci_bus_type) {

		*dev->dma_mask =  SZ_64M - 1;

		dev->coherent_dma_mask = SZ_64M - 1;

		dmabounce_register_dev(dev, 2048, 4096);

		dmabounce_register_dev(dev, 2048, 4096, ixp4xx_needs_bounce);

	}

	return 0;

}
@@ -337,11 +342,6 @@ static int ixp4xx_pci_platform_notify_remove(struct device *dev) 
	return 0;

}



int dma_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)

{

	return (dev->bus == &pci_bus_type ) && ((dma_addr + size) >= SZ_64M);

}



void __init ixp4xx_pci_preinit(void)

{

	unsigned long cpuid = read_cpuid_id();