mn10300: make the ASB2305's PCnet32 NIC work by using the PCI bridge's SRAM (012c79ba) · Commits · 戴 / test

arch/mn10300/mm/dma-alloc.c

+17 −0

Original line number	Diff line number	Diff line
		@@ -16,12 +16,24 @@
		#include <linux/pci.h>
		#include <asm/io.h>

		static unsigned long pci_sram_allocated = 0xbc000000;

		void dma_alloc_coherent(struct device dev, size_t size,
		dma_addr_t *dma_handle, int gfp)
		{
		unsigned long addr;
		void *ret;

		printk("dma_alloc_coherent(%s,%zu,,%x)\n", dev_name(dev), size, gfp);

		if (0xbe000000 - pci_sram_allocated >= size) {
		size = (size + 255) & ~255;
		addr = pci_sram_allocated;
		pci_sram_allocated += size;
		ret = (void *) addr;
		goto done;
		}

		/* ignore region specifiers */
		gfp &= ~(__GFP_DMA \| __GFP_HIGHMEM);

		@@ -41,7 +53,9 @@ void dma_alloc_coherent(struct device dev, size_t size,
		/* write back and evict all cache lines covering this region */
		mn10300_dcache_flush_inv_range2(virt_to_phys((void *) addr), PAGE_SIZE);

		done:
		dma_handle = virt_to_bus((void ) addr);
		printk("dma_alloc_coherent() = %p [%x]\n", ret, *dma_handle);
		return ret;
		}
		EXPORT_SYMBOL(dma_alloc_coherent);
		@@ -51,6 +65,9 @@ void dma_free_coherent(struct device dev, size_t size, void vaddr,
		{
		unsigned long addr = (unsigned long) vaddr & ~0x20000000;

		if (addr >= 0x9c000000)
		return;

		free_pages(addr, get_order(size));
		}
		EXPORT_SYMBOL(dma_free_coherent);