Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/alpha/kernel/pci-noop.c |
| 3 | * |
| 4 | * Stub PCI interfaces for Jensen-specific kernels. |
| 5 | */ |
| 6 | |
| 7 | #include <linux/pci.h> |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/bootmem.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 10 | #include <linux/gfp.h> |
Randy Dunlap | a941564 | 2006-01-11 12:17:48 -0800 | [diff] [blame] | 11 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/mm.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/dma-mapping.h> |
FUJITA Tomonori | 8c8d721 | 2007-11-21 12:26:31 +0100 | [diff] [blame] | 16 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #include "proto.h" |
| 19 | |
| 20 | |
| 21 | /* |
| 22 | * The PCI controller list. |
| 23 | */ |
| 24 | |
| 25 | struct pci_controller *hose_head, **hose_tail = &hose_head; |
| 26 | struct pci_controller *pci_isa_hose; |
| 27 | |
| 28 | |
| 29 | struct pci_controller * __init |
| 30 | alloc_pci_controller(void) |
| 31 | { |
| 32 | struct pci_controller *hose; |
| 33 | |
| 34 | hose = alloc_bootmem(sizeof(*hose)); |
| 35 | |
| 36 | *hose_tail = hose; |
| 37 | hose_tail = &hose->next; |
| 38 | |
| 39 | return hose; |
| 40 | } |
| 41 | |
| 42 | struct resource * __init |
| 43 | alloc_resource(void) |
| 44 | { |
| 45 | struct resource *res; |
| 46 | |
| 47 | res = alloc_bootmem(sizeof(*res)); |
| 48 | |
| 49 | return res; |
| 50 | } |
| 51 | |
| 52 | asmlinkage long |
| 53 | sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn) |
| 54 | { |
| 55 | struct pci_controller *hose; |
| 56 | |
| 57 | /* from hose or from bus.devfn */ |
| 58 | if (which & IOBASE_FROM_HOSE) { |
| 59 | for (hose = hose_head; hose; hose = hose->next) |
| 60 | if (hose->index == bus) |
| 61 | break; |
| 62 | if (!hose) |
| 63 | return -ENODEV; |
| 64 | } else { |
| 65 | /* Special hook for ISA access. */ |
| 66 | if (bus == 0 && dfn == 0) |
| 67 | hose = pci_isa_hose; |
| 68 | else |
| 69 | return -ENODEV; |
| 70 | } |
| 71 | |
| 72 | switch (which & ~IOBASE_FROM_HOSE) { |
| 73 | case IOBASE_HOSE: |
| 74 | return hose->index; |
| 75 | case IOBASE_SPARSE_MEM: |
| 76 | return hose->sparse_mem_base; |
| 77 | case IOBASE_DENSE_MEM: |
| 78 | return hose->dense_mem_base; |
| 79 | case IOBASE_SPARSE_IO: |
| 80 | return hose->sparse_io_base; |
| 81 | case IOBASE_DENSE_IO: |
| 82 | return hose->dense_io_base; |
| 83 | case IOBASE_ROOT_BUS: |
| 84 | return hose->bus->number; |
| 85 | } |
| 86 | |
| 87 | return -EOPNOTSUPP; |
| 88 | } |
| 89 | |
| 90 | asmlinkage long |
| 91 | sys_pciconfig_read(unsigned long bus, unsigned long dfn, |
| 92 | unsigned long off, unsigned long len, void *buf) |
| 93 | { |
| 94 | if (!capable(CAP_SYS_ADMIN)) |
| 95 | return -EPERM; |
| 96 | else |
| 97 | return -ENODEV; |
| 98 | } |
| 99 | |
| 100 | asmlinkage long |
| 101 | sys_pciconfig_write(unsigned long bus, unsigned long dfn, |
| 102 | unsigned long off, unsigned long len, void *buf) |
| 103 | { |
| 104 | if (!capable(CAP_SYS_ADMIN)) |
| 105 | return -EPERM; |
| 106 | else |
| 107 | return -ENODEV; |
| 108 | } |
| 109 | |
FUJITA Tomonori | c186cac | 2010-03-10 15:23:37 -0800 | [diff] [blame] | 110 | static void *alpha_noop_alloc_coherent(struct device *dev, size_t size, |
| 111 | dma_addr_t *dma_handle, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
| 113 | void *ret; |
| 114 | |
| 115 | if (!dev || *dev->dma_mask >= 0xffffffffUL) |
| 116 | gfp &= ~GFP_DMA; |
| 117 | ret = (void *)__get_free_pages(gfp, get_order(size)); |
| 118 | if (ret) { |
| 119 | memset(ret, 0, size); |
FUJITA Tomonori | fd2e263 | 2008-02-04 22:30:02 -0800 | [diff] [blame] | 120 | *dma_handle = virt_to_phys(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | } |
| 122 | return ret; |
| 123 | } |
| 124 | |
FUJITA Tomonori | c186cac | 2010-03-10 15:23:37 -0800 | [diff] [blame] | 125 | static void alpha_noop_free_coherent(struct device *dev, size_t size, |
| 126 | void *cpu_addr, dma_addr_t dma_addr) |
| 127 | { |
| 128 | free_pages((unsigned long)cpu_addr, get_order(size)); |
| 129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
FUJITA Tomonori | c186cac | 2010-03-10 15:23:37 -0800 | [diff] [blame] | 131 | static dma_addr_t alpha_noop_map_page(struct device *dev, struct page *page, |
| 132 | unsigned long offset, size_t size, |
| 133 | enum dma_data_direction dir, |
| 134 | struct dma_attrs *attrs) |
| 135 | { |
| 136 | return page_to_pa(page) + offset; |
| 137 | } |
| 138 | |
| 139 | static int alpha_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents, |
| 140 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | { |
| 142 | int i; |
FUJITA Tomonori | 8c8d721 | 2007-11-21 12:26:31 +0100 | [diff] [blame] | 143 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
FUJITA Tomonori | 8c8d721 | 2007-11-21 12:26:31 +0100 | [diff] [blame] | 145 | for_each_sg(sgl, sg, nents, i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | void *va; |
| 147 | |
FUJITA Tomonori | 8c8d721 | 2007-11-21 12:26:31 +0100 | [diff] [blame] | 148 | BUG_ON(!sg_page(sg)); |
| 149 | va = sg_virt(sg); |
FUJITA Tomonori | fd2e263 | 2008-02-04 22:30:02 -0800 | [diff] [blame] | 150 | sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va); |
FUJITA Tomonori | 8c8d721 | 2007-11-21 12:26:31 +0100 | [diff] [blame] | 151 | sg_dma_len(sg) = sg->length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | return nents; |
| 155 | } |
| 156 | |
FUJITA Tomonori | c186cac | 2010-03-10 15:23:37 -0800 | [diff] [blame] | 157 | static int alpha_noop_mapping_error(struct device *dev, dma_addr_t dma_addr) |
| 158 | { |
| 159 | return 0; |
| 160 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
FUJITA Tomonori | c186cac | 2010-03-10 15:23:37 -0800 | [diff] [blame] | 162 | static int alpha_noop_supported(struct device *dev, u64 mask) |
| 163 | { |
| 164 | return mask < 0x00ffffffUL ? 0 : 1; |
| 165 | } |
| 166 | |
| 167 | static int alpha_noop_set_mask(struct device *dev, u64 mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
| 169 | if (!dev->dma_mask || !dma_supported(dev, mask)) |
| 170 | return -EIO; |
| 171 | |
| 172 | *dev->dma_mask = mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | return 0; |
| 174 | } |
FUJITA Tomonori | c186cac | 2010-03-10 15:23:37 -0800 | [diff] [blame] | 175 | |
| 176 | struct dma_map_ops alpha_noop_ops = { |
| 177 | .alloc_coherent = alpha_noop_alloc_coherent, |
| 178 | .free_coherent = alpha_noop_free_coherent, |
| 179 | .map_page = alpha_noop_map_page, |
| 180 | .map_sg = alpha_noop_map_sg, |
| 181 | .mapping_error = alpha_noop_mapping_error, |
| 182 | .dma_supported = alpha_noop_supported, |
| 183 | .set_dma_mask = alpha_noop_set_mask, |
| 184 | }; |
| 185 | |
| 186 | struct dma_map_ops *dma_ops = &alpha_noop_ops; |
| 187 | EXPORT_SYMBOL(dma_ops); |