fsl-diu-fb: update Freescale DIU driver to use page_alloc_exact()

static struct diu_pool pool;

/*	To allocate memory for framebuffer. First try __get_free_pages(). If it

 *	fails, try rh_alloc. The reason is __get_free_pages() cannot allocate

 *	very large memory (more than 4MB). We don't want to allocate all memory

 *	in rheap since small memory allocation/deallocation will fragment the

 *	rheap and make the furture large allocation fail.

/**

 * fsl_diu_alloc - allocate memory for the DIU

 * @size: number of bytes to allocate

 * @param: returned physical address of memory

 *

 * This function allocates a physically-contiguous block of memory.

 */

static void *fsl_diu_alloc(unsigned long size, phys_addr_t *phys)

static void *fsl_diu_alloc(size_t size, phys_addr_t *phys)

{

	void *virt;

	pr_debug("size=%lu\n", size);

	pr_debug("size=%zu\n", size);

	virt = (void *)__get_free_pages(GFP_DMA | __GFP_ZERO, get_order(size));

	virt = alloc_pages_exact(size, GFP_DMA | __GFP_ZERO);

	if (virt) {

		*phys = virt_to_phys(virt);

		pr_debug("virt %p, phys=%llx\n", virt, (uint64_t) *phys);

		return virt;

	}

	if (!diu_ops.diu_mem) {

		printk(KERN_INFO "%s: no diu_mem."

			" To reserve more memory, put 'diufb=15M' "

			"in the command line\n", __func__);

		return NULL;

	}

	virt = (void *)rh_alloc(&diu_ops.diu_rh_info, size, "DIU");

	if (virt) {

		*phys = virt_to_bus(virt);

		memset(virt, 0, size);

		pr_debug("virt=%p phys=%llx\n", virt,

			(unsigned long long)*phys);

	}

	pr_debug("rh virt=%p phys=%llx\n", virt, (unsigned long long)*phys);

	return virt;

}

static void fsl_diu_free(void *p, unsigned long size)

/**

 * fsl_diu_free - release DIU memory

 * @virt: pointer returned by fsl_diu_alloc()

 * @size: number of bytes allocated by fsl_diu_alloc()

 *

 * This function releases memory allocated by fsl_diu_alloc().

 */

static void fsl_diu_free(void *virt, size_t size)

{

	pr_debug("p=%p size=%lu\n", p, size);

	pr_debug("virt=%p size=%zu\n", virt, size);

	if (!p)

		return;

	if ((p >= diu_ops.diu_mem) &&

	    (p < (diu_ops.diu_mem + diu_ops.diu_size))) {

		pr_debug("rh\n");

		rh_free(&diu_ops.diu_rh_info, (unsigned long) p);

	} else {

		pr_debug("dma\n");

		free_pages((unsigned long)p, get_order(size));

	}

	if (virt && size)

		free_pages_exact(virt, size);

}

static int fsl_diu_enable_panel(struct fb_info *info)