The patch titled mn10300: make the ASB2305's PCnet32 NIC work by using the PCI bridge's SRAM has been added to the -mm tree. Its filename is mn10300-make-the-asb2305s-pcnet32-nic-work-by-using-the-pci-bridges-sram.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: mn10300: make the ASB2305's PCnet32 NIC work by using the PCI bridge's SRAM From: David Howells <dhowells@xxxxxxxxxx> Access to the ASB2305's PCnet32 NIC doesn't work correctly because when the NIC attempts to update the ring buffer flags by DMA, the change to RAM crops up about 17uS after the interrupt line is asserted. This is almost certainly due to a bug in the PCI bridge FPGA on that board. We can get around this by making dma_alloc_coherent() put the ring buffer in the SRAM attached to the PCI bridge rather than in the SDRAM. Signed-off-by: David Howells <dhowells@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/mn10300/mm/dma-alloc.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff -puN arch/mn10300/mm/dma-alloc.c~mn10300-make-the-asb2305s-pcnet32-nic-work-by-using-the-pci-bridges-sram arch/mn10300/mm/dma-alloc.c --- a/arch/mn10300/mm/dma-alloc.c~mn10300-make-the-asb2305s-pcnet32-nic-work-by-using-the-pci-bridges-sram +++ a/arch/mn10300/mm/dma-alloc.c @@ -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 * /* 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 *de { unsigned long addr = (unsigned long) vaddr & ~0x20000000; + if (addr >= 0x9c000000) + return; + free_pages(addr, get_order(size)); } EXPORT_SYMBOL(dma_free_coherent); _ Patches currently in -mm which might be from dhowells@xxxxxxxxxx are mm-make-totalhigh_pages-unsigned-long.patch fdpic-respect-pt_gnu_stack-exec-protection-markings-when-creating-nommu-stack.patch nommu-avoiding-duplicate-icache-flushes-of-shared-maps.patch nommu-use-copy__user_page-in-access_process_vm.patch mn10300-signal-stack-fix.patch mn10300-objcopy-flags-fix.patch mn10300-add-cc-clobbers-to-asm-statements.patch mn10300-wire-up-missing-new-syscalls.patch fix-several-bogus-includes-on-mn10300-abs2305.patch mn10300-use-kern_err-not-kern_error.patch mn10300-use-generic-pci_enable_resources.patch mn10300-insert-pci-root-bus-resources-for-the-asb2305-devel-motherboard.patch mn10300-make-the-asb2305s-pcnet32-nic-work-by-using-the-pci-bridges-sram.patch mn10300-update-the-asb2303-defconfig.patch kernel-credc-use-kmem_cache_free.patch frv-duplicate-output_buffer-of-e03.patch mutex-subsystem-synchro-test-module.patch mutex-subsystem-synchro-test-module-add-missing-header-file.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html