138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/sw/kernel/pci-noop.c
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*
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* Stub PCI interfaces for NO PCI kernels.
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*/
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#include <linux/pci.h>
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#include <linux/memblock.h>
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#include <linux/dma-mapping.h>
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/*
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* The PCI controller list.
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*/
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struct pci_controller *hose_head, **hose_tail = &hose_head;
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struct pci_controller * __init
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alloc_pci_controller(void)
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{
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struct pci_controller *hose;
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hose = memblock_alloc(sizeof(*hose), SMP_CACHE_BYTES);
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*hose_tail = hose;
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hose_tail = &hose->next;
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return hose;
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}
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struct resource * __init
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alloc_resource(void)
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{
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struct resource *res;
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res = memblock_alloc(sizeof(*res), SMP_CACHE_BYTES);
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return res;
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}
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asmlinkage long
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sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
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{
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return -ENODEV;
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}
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asmlinkage long
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sys_pciconfig_read(unsigned long bus, unsigned long dfn,
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unsigned long off, unsigned long len, void *buf)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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else
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return -ENODEV;
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}
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asmlinkage long
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sys_pciconfig_write(unsigned long bus, unsigned long dfn,
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unsigned long off, unsigned long len, void *buf)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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else
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return -ENODEV;
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}
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static void *sw64_noop_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp,
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unsigned long attrs)
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{
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void *ret;
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if (!dev || *dev->dma_mask >= 0xffffffffUL)
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gfp &= ~GFP_DMA;
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ret = (void *)__get_free_pages(gfp, get_order(size));
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if (ret) {
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memset(ret, 0, size);
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*dma_handle = virt_to_phys(ret);
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}
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return ret;
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}
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static void sw64_noop_free_coherent(struct device *dev, size_t size,
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void *cpu_addr, dma_addr_t dma_addr,
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unsigned long attrs)
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{
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free_pages((unsigned long)cpu_addr, get_order(size));
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}
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static dma_addr_t sw64_noop_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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return page_to_pa(page) + offset;
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}
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static int sw64_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
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enum dma_data_direction dir, unsigned long attrs)
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{
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int i;
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struct scatterlist *sg;
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for_each_sg(sgl, sg, nents, i) {
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void *va;
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BUG_ON(!sg_page(sg));
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va = sg_virt(sg);
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sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va);
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sg_dma_len(sg) = sg->length;
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}
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return nents;
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}
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static int sw64_noop_supported(struct device *dev, u64 mask)
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{
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return mask < 0x00ffffffUL ? 0 : 1;
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}
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const struct dma_map_ops sw64_noop_ops = {
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.alloc = sw64_noop_alloc_coherent,
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.free = sw64_noop_free_coherent,
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.map_page = sw64_noop_map_page,
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.map_sg = sw64_noop_map_sg,
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.dma_supported = sw64_noop_supported,
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};
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const struct dma_map_ops *dma_ops = &sw64_noop_ops;
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EXPORT_SYMBOL(dma_ops);
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void __init common_init_pci(void)
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{
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}
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void __init sw64_init_arch(void) { }
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void __init sw64_init_irq(void) { }
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