Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Contains common pci routines for ALL ppc platform |
Kumar Gala | cf1d8a8 | 2007-06-28 22:56:24 -0500 | [diff] [blame] | 3 | * (based on pci_32.c and pci_64.c) |
| 4 | * |
| 5 | * Port for PPC64 David Engebretsen, IBM Corp. |
| 6 | * Contains common pci routines for ppc64 platform, pSeries and iSeries brands. |
| 7 | * |
| 8 | * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM |
| 9 | * Rework, based on alpha PCI code. |
| 10 | * |
| 11 | * Common pmac/prep/chrp pci routines. -- Cort |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License |
| 15 | * as published by the Free Software Foundation; either version |
| 16 | * 2 of the License, or (at your option) any later version. |
| 17 | */ |
| 18 | |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 19 | #include <linux/kernel.h> |
| 20 | #include <linux/pci.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/init.h> |
Gavin Shan | d92a208 | 2014-04-24 18:00:24 +1000 | [diff] [blame] | 23 | #include <linux/delay.h> |
Paul Gortmaker | 66b15db | 2011-05-27 10:46:24 -0400 | [diff] [blame] | 24 | #include <linux/export.h> |
Grant Likely | 22ae782 | 2010-07-29 11:49:01 -0600 | [diff] [blame] | 25 | #include <linux/of_address.h> |
Sebastian Andrzej Siewior | 04bea68 | 2011-01-24 09:58:55 +0530 | [diff] [blame] | 26 | #include <linux/of_pci.h> |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 27 | #include <linux/mm.h> |
| 28 | #include <linux/list.h> |
| 29 | #include <linux/syscalls.h> |
| 30 | #include <linux/irq.h> |
| 31 | #include <linux/vmalloc.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Brian King | c2e1d84 | 2013-04-08 03:05:10 +0000 | [diff] [blame] | 33 | #include <linux/vgaarb.h> |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 34 | |
| 35 | #include <asm/processor.h> |
| 36 | #include <asm/io.h> |
| 37 | #include <asm/prom.h> |
| 38 | #include <asm/pci-bridge.h> |
| 39 | #include <asm/byteorder.h> |
| 40 | #include <asm/machdep.h> |
| 41 | #include <asm/ppc-pci.h> |
Benjamin Herrenschmidt | 8b8da35 | 2008-10-27 19:48:37 +0000 | [diff] [blame] | 42 | #include <asm/eeh.h> |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 43 | |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 44 | static DEFINE_SPINLOCK(hose_spinlock); |
Milton Miller | c3bd517 | 2009-01-08 02:19:46 +0000 | [diff] [blame] | 45 | LIST_HEAD(hose_list); |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 46 | |
| 47 | /* XXX kill that some day ... */ |
Stephen Rothwell | ebfc00f | 2007-11-19 16:56:15 +1100 | [diff] [blame] | 48 | static int global_phb_number; /* Global phb counter */ |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 49 | |
Benjamin Herrenschmidt | 25e81f9 | 2007-12-11 14:48:17 +1100 | [diff] [blame] | 50 | /* ISA Memory physical address */ |
| 51 | resource_size_t isa_mem_base; |
| 52 | |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 53 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 54 | static struct dma_map_ops *pci_dma_ops = &dma_direct_ops; |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 55 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 56 | void set_pci_dma_ops(struct dma_map_ops *dma_ops) |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 57 | { |
| 58 | pci_dma_ops = dma_ops; |
| 59 | } |
| 60 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 61 | struct dma_map_ops *get_pci_dma_ops(void) |
Becky Bruce | 4fc665b | 2008-09-12 10:34:46 +0000 | [diff] [blame] | 62 | { |
| 63 | return pci_dma_ops; |
| 64 | } |
| 65 | EXPORT_SYMBOL(get_pci_dma_ops); |
| 66 | |
Stephen Rothwell | e60516e | 2007-12-11 11:02:07 +1100 | [diff] [blame] | 67 | struct pci_controller *pcibios_alloc_controller(struct device_node *dev) |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 68 | { |
| 69 | struct pci_controller *phb; |
| 70 | |
Stephen Rothwell | e60516e | 2007-12-11 11:02:07 +1100 | [diff] [blame] | 71 | phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL); |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 72 | if (phb == NULL) |
| 73 | return NULL; |
Stephen Rothwell | e60516e | 2007-12-11 11:02:07 +1100 | [diff] [blame] | 74 | spin_lock(&hose_spinlock); |
| 75 | phb->global_number = global_phb_number++; |
| 76 | list_add_tail(&phb->list_node, &hose_list); |
| 77 | spin_unlock(&hose_spinlock); |
Stephen Rothwell | 44ef339 | 2007-12-10 14:33:21 +1100 | [diff] [blame] | 78 | phb->dn = dev; |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 79 | phb->is_dynamic = mem_init_done; |
| 80 | #ifdef CONFIG_PPC64 |
| 81 | if (dev) { |
| 82 | int nid = of_node_to_nid(dev); |
| 83 | |
| 84 | if (nid < 0 || !node_online(nid)) |
| 85 | nid = -1; |
| 86 | |
| 87 | PHB_SET_NODE(phb, nid); |
| 88 | } |
| 89 | #endif |
| 90 | return phb; |
| 91 | } |
| 92 | |
| 93 | void pcibios_free_controller(struct pci_controller *phb) |
| 94 | { |
| 95 | spin_lock(&hose_spinlock); |
| 96 | list_del(&phb->list_node); |
| 97 | spin_unlock(&hose_spinlock); |
| 98 | |
| 99 | if (phb->is_dynamic) |
| 100 | kfree(phb); |
| 101 | } |
| 102 | |
Gavin Shan | 4c2245b | 2012-09-11 16:59:46 -0600 | [diff] [blame] | 103 | /* |
| 104 | * The function is used to return the minimal alignment |
| 105 | * for memory or I/O windows of the associated P2P bridge. |
| 106 | * By default, 4KiB alignment for I/O windows and 1MiB for |
| 107 | * memory windows. |
| 108 | */ |
| 109 | resource_size_t pcibios_window_alignment(struct pci_bus *bus, |
| 110 | unsigned long type) |
| 111 | { |
| 112 | if (ppc_md.pcibios_window_alignment) |
| 113 | return ppc_md.pcibios_window_alignment(bus, type); |
| 114 | |
| 115 | /* |
| 116 | * PCI core will figure out the default |
| 117 | * alignment: 4KiB for I/O and 1MiB for |
| 118 | * memory window. |
| 119 | */ |
| 120 | return 1; |
| 121 | } |
| 122 | |
Gavin Shan | d92a208 | 2014-04-24 18:00:24 +1000 | [diff] [blame] | 123 | void pcibios_reset_secondary_bus(struct pci_dev *dev) |
| 124 | { |
Gavin Shan | d92a208 | 2014-04-24 18:00:24 +1000 | [diff] [blame] | 125 | if (ppc_md.pcibios_reset_secondary_bus) { |
| 126 | ppc_md.pcibios_reset_secondary_bus(dev); |
| 127 | return; |
| 128 | } |
| 129 | |
Gavin Shan | 21dd5a4 | 2014-06-19 17:22:45 +1000 | [diff] [blame] | 130 | pci_reset_secondary_bus(dev); |
Gavin Shan | d92a208 | 2014-04-24 18:00:24 +1000 | [diff] [blame] | 131 | } |
| 132 | |
Milton Miller | c3bd517 | 2009-01-08 02:19:46 +0000 | [diff] [blame] | 133 | static resource_size_t pcibios_io_size(const struct pci_controller *hose) |
| 134 | { |
| 135 | #ifdef CONFIG_PPC64 |
| 136 | return hose->pci_io_size; |
| 137 | #else |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 138 | return resource_size(&hose->io_resource); |
Milton Miller | c3bd517 | 2009-01-08 02:19:46 +0000 | [diff] [blame] | 139 | #endif |
| 140 | } |
| 141 | |
Benjamin Herrenschmidt | 6dfbde2 | 2007-07-26 14:07:13 +1000 | [diff] [blame] | 142 | int pcibios_vaddr_is_ioport(void __iomem *address) |
| 143 | { |
| 144 | int ret = 0; |
| 145 | struct pci_controller *hose; |
Milton Miller | c3bd517 | 2009-01-08 02:19:46 +0000 | [diff] [blame] | 146 | resource_size_t size; |
Benjamin Herrenschmidt | 6dfbde2 | 2007-07-26 14:07:13 +1000 | [diff] [blame] | 147 | |
| 148 | spin_lock(&hose_spinlock); |
| 149 | list_for_each_entry(hose, &hose_list, list_node) { |
Milton Miller | c3bd517 | 2009-01-08 02:19:46 +0000 | [diff] [blame] | 150 | size = pcibios_io_size(hose); |
Benjamin Herrenschmidt | 6dfbde2 | 2007-07-26 14:07:13 +1000 | [diff] [blame] | 151 | if (address >= hose->io_base_virt && |
| 152 | address < (hose->io_base_virt + size)) { |
| 153 | ret = 1; |
| 154 | break; |
| 155 | } |
| 156 | } |
| 157 | spin_unlock(&hose_spinlock); |
| 158 | return ret; |
| 159 | } |
| 160 | |
Milton Miller | c3bd517 | 2009-01-08 02:19:46 +0000 | [diff] [blame] | 161 | unsigned long pci_address_to_pio(phys_addr_t address) |
| 162 | { |
| 163 | struct pci_controller *hose; |
| 164 | resource_size_t size; |
| 165 | unsigned long ret = ~0; |
| 166 | |
| 167 | spin_lock(&hose_spinlock); |
| 168 | list_for_each_entry(hose, &hose_list, list_node) { |
| 169 | size = pcibios_io_size(hose); |
| 170 | if (address >= hose->io_base_phys && |
| 171 | address < (hose->io_base_phys + size)) { |
| 172 | unsigned long base = |
| 173 | (unsigned long)hose->io_base_virt - _IO_BASE; |
| 174 | ret = base + (address - hose->io_base_phys); |
| 175 | break; |
| 176 | } |
| 177 | } |
| 178 | spin_unlock(&hose_spinlock); |
| 179 | |
| 180 | return ret; |
| 181 | } |
| 182 | EXPORT_SYMBOL_GPL(pci_address_to_pio); |
| 183 | |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 184 | /* |
| 185 | * Return the domain number for this bus. |
| 186 | */ |
| 187 | int pci_domain_nr(struct pci_bus *bus) |
| 188 | { |
Stephen Rothwell | 6207e81 | 2007-12-07 02:04:33 +1100 | [diff] [blame] | 189 | struct pci_controller *hose = pci_bus_to_host(bus); |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 190 | |
Stephen Rothwell | 6207e81 | 2007-12-07 02:04:33 +1100 | [diff] [blame] | 191 | return hose->global_number; |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 192 | } |
Kumar Gala | 5516b54 | 2007-06-27 01:17:57 -0500 | [diff] [blame] | 193 | EXPORT_SYMBOL(pci_domain_nr); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 194 | |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 195 | /* This routine is meant to be used early during boot, when the |
| 196 | * PCI bus numbers have not yet been assigned, and you need to |
| 197 | * issue PCI config cycles to an OF device. |
| 198 | * It could also be used to "fix" RTAS config cycles if you want |
| 199 | * to set pci_assign_all_buses to 1 and still use RTAS for PCI |
| 200 | * config cycles. |
| 201 | */ |
| 202 | struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node) |
| 203 | { |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 204 | while(node) { |
| 205 | struct pci_controller *hose, *tmp; |
| 206 | list_for_each_entry_safe(hose, tmp, &hose_list, list_node) |
Stephen Rothwell | 44ef339 | 2007-12-10 14:33:21 +1100 | [diff] [blame] | 207 | if (hose->dn == node) |
Kumar Gala | a4c9e32 | 2007-06-27 13:09:43 -0500 | [diff] [blame] | 208 | return hose; |
| 209 | node = node->parent; |
| 210 | } |
| 211 | return NULL; |
| 212 | } |
| 213 | |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 214 | /* |
| 215 | * Reads the interrupt pin to determine if interrupt is use by card. |
| 216 | * If the interrupt is used, then gets the interrupt line from the |
| 217 | * openfirmware and sets it in the pci_dev and pci_config line. |
| 218 | */ |
Benjamin Herrenschmidt | 4666ca2 | 2011-11-29 20:16:25 +0000 | [diff] [blame] | 219 | static int pci_read_irq_line(struct pci_dev *pci_dev) |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 220 | { |
Grant Likely | 530210c | 2013-09-15 16:39:11 +0100 | [diff] [blame] | 221 | struct of_phandle_args oirq; |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 222 | unsigned int virq; |
| 223 | |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 224 | pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev)); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 225 | |
| 226 | #ifdef DEBUG |
| 227 | memset(&oirq, 0xff, sizeof(oirq)); |
| 228 | #endif |
| 229 | /* Try to get a mapping from the device-tree */ |
Grant Likely | 0c02c80 | 2013-09-19 11:22:36 -0500 | [diff] [blame] | 230 | if (of_irq_parse_pci(pci_dev, &oirq)) { |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 231 | u8 line, pin; |
| 232 | |
| 233 | /* If that fails, lets fallback to what is in the config |
| 234 | * space and map that through the default controller. We |
| 235 | * also set the type to level low since that's what PCI |
| 236 | * interrupts are. If your platform does differently, then |
| 237 | * either provide a proper interrupt tree or don't use this |
| 238 | * function. |
| 239 | */ |
| 240 | if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin)) |
| 241 | return -1; |
| 242 | if (pin == 0) |
| 243 | return -1; |
| 244 | if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) || |
Benjamin Herrenschmidt | 54a24cb | 2007-12-20 15:10:02 +1100 | [diff] [blame] | 245 | line == 0xff || line == 0) { |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 246 | return -1; |
| 247 | } |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 248 | pr_debug(" No map ! Using line %d (pin %d) from PCI config\n", |
| 249 | line, pin); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 250 | |
| 251 | virq = irq_create_mapping(NULL, line); |
| 252 | if (virq != NO_IRQ) |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 253 | irq_set_irq_type(virq, IRQ_TYPE_LEVEL_LOW); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 254 | } else { |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 255 | pr_debug(" Got one, spec %d cells (0x%08x 0x%08x...) on %s\n", |
Grant Likely | 530210c | 2013-09-15 16:39:11 +0100 | [diff] [blame] | 256 | oirq.args_count, oirq.args[0], oirq.args[1], |
| 257 | of_node_full_name(oirq.np)); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 258 | |
Grant Likely | e6d30ab | 2013-09-15 16:55:53 +0100 | [diff] [blame] | 259 | virq = irq_create_of_mapping(&oirq); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 260 | } |
| 261 | if(virq == NO_IRQ) { |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 262 | pr_debug(" Failed to map !\n"); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 263 | return -1; |
| 264 | } |
| 265 | |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 266 | pr_debug(" Mapped to linux irq %d\n", virq); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 267 | |
| 268 | pci_dev->irq = virq; |
| 269 | |
| 270 | return 0; |
| 271 | } |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 272 | |
| 273 | /* |
| 274 | * Platform support for /proc/bus/pci/X/Y mmap()s, |
| 275 | * modelled on the sparc64 implementation by Dave Miller. |
| 276 | * -- paulus. |
| 277 | */ |
| 278 | |
| 279 | /* |
| 280 | * Adjust vm_pgoff of VMA such that it is the physical page offset |
| 281 | * corresponding to the 32-bit pci bus offset for DEV requested by the user. |
| 282 | * |
| 283 | * Basically, the user finds the base address for his device which he wishes |
| 284 | * to mmap. They read the 32-bit value from the config space base register, |
| 285 | * add whatever PAGE_SIZE multiple offset they wish, and feed this into the |
| 286 | * offset parameter of mmap on /proc/bus/pci/XXX for that device. |
| 287 | * |
| 288 | * Returns negative error code on failure, zero on success. |
| 289 | */ |
| 290 | static struct resource *__pci_mmap_make_offset(struct pci_dev *dev, |
| 291 | resource_size_t *offset, |
| 292 | enum pci_mmap_state mmap_state) |
| 293 | { |
| 294 | struct pci_controller *hose = pci_bus_to_host(dev->bus); |
| 295 | unsigned long io_offset = 0; |
| 296 | int i, res_bit; |
| 297 | |
Anton Blanchard | b0d436c | 2013-08-07 02:01:24 +1000 | [diff] [blame] | 298 | if (hose == NULL) |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 299 | return NULL; /* should never happen */ |
| 300 | |
| 301 | /* If memory, add on the PCI bridge address offset */ |
| 302 | if (mmap_state == pci_mmap_mem) { |
| 303 | #if 0 /* See comment in pci_resource_to_user() for why this is disabled */ |
| 304 | *offset += hose->pci_mem_offset; |
| 305 | #endif |
| 306 | res_bit = IORESOURCE_MEM; |
| 307 | } else { |
| 308 | io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 309 | *offset += io_offset; |
| 310 | res_bit = IORESOURCE_IO; |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Check that the offset requested corresponds to one of the |
| 315 | * resources of the device. |
| 316 | */ |
| 317 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
| 318 | struct resource *rp = &dev->resource[i]; |
| 319 | int flags = rp->flags; |
| 320 | |
| 321 | /* treat ROM as memory (should be already) */ |
| 322 | if (i == PCI_ROM_RESOURCE) |
| 323 | flags |= IORESOURCE_MEM; |
| 324 | |
| 325 | /* Active and same type? */ |
| 326 | if ((flags & res_bit) == 0) |
| 327 | continue; |
| 328 | |
| 329 | /* In the range of this resource? */ |
| 330 | if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end) |
| 331 | continue; |
| 332 | |
| 333 | /* found it! construct the final physical address */ |
| 334 | if (mmap_state == pci_mmap_io) |
| 335 | *offset += hose->io_base_phys - io_offset; |
| 336 | return rp; |
| 337 | } |
| 338 | |
| 339 | return NULL; |
| 340 | } |
| 341 | |
| 342 | /* |
| 343 | * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci |
| 344 | * device mapping. |
| 345 | */ |
| 346 | static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp, |
| 347 | pgprot_t protection, |
| 348 | enum pci_mmap_state mmap_state, |
| 349 | int write_combine) |
| 350 | { |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 351 | |
| 352 | /* Write combine is always 0 on non-memory space mappings. On |
| 353 | * memory space, if the user didn't pass 1, we check for a |
| 354 | * "prefetchable" resource. This is a bit hackish, but we use |
| 355 | * this to workaround the inability of /sysfs to provide a write |
| 356 | * combine bit |
| 357 | */ |
| 358 | if (mmap_state != pci_mmap_mem) |
| 359 | write_combine = 0; |
| 360 | else if (write_combine == 0) { |
| 361 | if (rp->flags & IORESOURCE_PREFETCH) |
| 362 | write_combine = 1; |
| 363 | } |
| 364 | |
| 365 | /* XXX would be nice to have a way to ask for write-through */ |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 366 | if (write_combine) |
Aneesh Kumar K.V | 83d5e64 | 2013-05-06 10:51:00 +0000 | [diff] [blame] | 367 | return pgprot_noncached_wc(protection); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 368 | else |
Aneesh Kumar K.V | 83d5e64 | 2013-05-06 10:51:00 +0000 | [diff] [blame] | 369 | return pgprot_noncached(protection); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | /* |
| 373 | * This one is used by /dev/mem and fbdev who have no clue about the |
| 374 | * PCI device, it tries to find the PCI device first and calls the |
| 375 | * above routine |
| 376 | */ |
| 377 | pgprot_t pci_phys_mem_access_prot(struct file *file, |
| 378 | unsigned long pfn, |
| 379 | unsigned long size, |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 380 | pgprot_t prot) |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 381 | { |
| 382 | struct pci_dev *pdev = NULL; |
| 383 | struct resource *found = NULL; |
Benjamin Herrenschmidt | 7c12d90 | 2008-10-01 15:30:04 +0000 | [diff] [blame] | 384 | resource_size_t offset = ((resource_size_t)pfn) << PAGE_SHIFT; |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 385 | int i; |
| 386 | |
| 387 | if (page_is_ram(pfn)) |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 388 | return prot; |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 389 | |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 390 | prot = pgprot_noncached(prot); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 391 | for_each_pci_dev(pdev) { |
| 392 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) { |
| 393 | struct resource *rp = &pdev->resource[i]; |
| 394 | int flags = rp->flags; |
| 395 | |
| 396 | /* Active and same type? */ |
| 397 | if ((flags & IORESOURCE_MEM) == 0) |
| 398 | continue; |
| 399 | /* In the range of this resource? */ |
| 400 | if (offset < (rp->start & PAGE_MASK) || |
| 401 | offset > rp->end) |
| 402 | continue; |
| 403 | found = rp; |
| 404 | break; |
| 405 | } |
| 406 | if (found) |
| 407 | break; |
| 408 | } |
| 409 | if (found) { |
| 410 | if (found->flags & IORESOURCE_PREFETCH) |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 411 | prot = pgprot_noncached_wc(prot); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 412 | pci_dev_put(pdev); |
| 413 | } |
| 414 | |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 415 | pr_debug("PCI: Non-PCI map for %llx, prot: %lx\n", |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 416 | (unsigned long long)offset, pgprot_val(prot)); |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 417 | |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 418 | return prot; |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | |
| 422 | /* |
| 423 | * Perform the actual remap of the pages for a PCI device mapping, as |
| 424 | * appropriate for this architecture. The region in the process to map |
| 425 | * is described by vm_start and vm_end members of VMA, the base physical |
| 426 | * address is found in vm_pgoff. |
| 427 | * The pci device structure is provided so that architectures may make mapping |
| 428 | * decisions on a per-device or per-bus basis. |
| 429 | * |
| 430 | * Returns a negative error code on failure, zero on success. |
| 431 | */ |
| 432 | int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, |
| 433 | enum pci_mmap_state mmap_state, int write_combine) |
| 434 | { |
Benjamin Herrenschmidt | 7c12d90 | 2008-10-01 15:30:04 +0000 | [diff] [blame] | 435 | resource_size_t offset = |
| 436 | ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 437 | struct resource *rp; |
| 438 | int ret; |
| 439 | |
| 440 | rp = __pci_mmap_make_offset(dev, &offset, mmap_state); |
| 441 | if (rp == NULL) |
| 442 | return -EINVAL; |
| 443 | |
| 444 | vma->vm_pgoff = offset >> PAGE_SHIFT; |
| 445 | vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp, |
| 446 | vma->vm_page_prot, |
| 447 | mmap_state, write_combine); |
| 448 | |
| 449 | ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
| 450 | vma->vm_end - vma->vm_start, vma->vm_page_prot); |
| 451 | |
| 452 | return ret; |
| 453 | } |
| 454 | |
Benjamin Herrenschmidt | e9f82cb | 2008-10-14 11:55:31 +1100 | [diff] [blame] | 455 | /* This provides legacy IO read access on a bus */ |
| 456 | int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size) |
| 457 | { |
| 458 | unsigned long offset; |
| 459 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 460 | struct resource *rp = &hose->io_resource; |
| 461 | void __iomem *addr; |
| 462 | |
| 463 | /* Check if port can be supported by that bus. We only check |
| 464 | * the ranges of the PHB though, not the bus itself as the rules |
| 465 | * for forwarding legacy cycles down bridges are not our problem |
| 466 | * here. So if the host bridge supports it, we do it. |
| 467 | */ |
| 468 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 469 | offset += port; |
| 470 | |
| 471 | if (!(rp->flags & IORESOURCE_IO)) |
| 472 | return -ENXIO; |
| 473 | if (offset < rp->start || (offset + size) > rp->end) |
| 474 | return -ENXIO; |
| 475 | addr = hose->io_base_virt + port; |
| 476 | |
| 477 | switch(size) { |
| 478 | case 1: |
| 479 | *((u8 *)val) = in_8(addr); |
| 480 | return 1; |
| 481 | case 2: |
| 482 | if (port & 1) |
| 483 | return -EINVAL; |
| 484 | *((u16 *)val) = in_le16(addr); |
| 485 | return 2; |
| 486 | case 4: |
| 487 | if (port & 3) |
| 488 | return -EINVAL; |
| 489 | *((u32 *)val) = in_le32(addr); |
| 490 | return 4; |
| 491 | } |
| 492 | return -EINVAL; |
| 493 | } |
| 494 | |
| 495 | /* This provides legacy IO write access on a bus */ |
| 496 | int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size) |
| 497 | { |
| 498 | unsigned long offset; |
| 499 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 500 | struct resource *rp = &hose->io_resource; |
| 501 | void __iomem *addr; |
| 502 | |
| 503 | /* Check if port can be supported by that bus. We only check |
| 504 | * the ranges of the PHB though, not the bus itself as the rules |
| 505 | * for forwarding legacy cycles down bridges are not our problem |
| 506 | * here. So if the host bridge supports it, we do it. |
| 507 | */ |
| 508 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 509 | offset += port; |
| 510 | |
| 511 | if (!(rp->flags & IORESOURCE_IO)) |
| 512 | return -ENXIO; |
| 513 | if (offset < rp->start || (offset + size) > rp->end) |
| 514 | return -ENXIO; |
| 515 | addr = hose->io_base_virt + port; |
| 516 | |
| 517 | /* WARNING: The generic code is idiotic. It gets passed a pointer |
| 518 | * to what can be a 1, 2 or 4 byte quantity and always reads that |
| 519 | * as a u32, which means that we have to correct the location of |
| 520 | * the data read within those 32 bits for size 1 and 2 |
| 521 | */ |
| 522 | switch(size) { |
| 523 | case 1: |
| 524 | out_8(addr, val >> 24); |
| 525 | return 1; |
| 526 | case 2: |
| 527 | if (port & 1) |
| 528 | return -EINVAL; |
| 529 | out_le16(addr, val >> 16); |
| 530 | return 2; |
| 531 | case 4: |
| 532 | if (port & 3) |
| 533 | return -EINVAL; |
| 534 | out_le32(addr, val); |
| 535 | return 4; |
| 536 | } |
| 537 | return -EINVAL; |
| 538 | } |
| 539 | |
| 540 | /* This provides legacy IO or memory mmap access on a bus */ |
| 541 | int pci_mmap_legacy_page_range(struct pci_bus *bus, |
| 542 | struct vm_area_struct *vma, |
| 543 | enum pci_mmap_state mmap_state) |
| 544 | { |
| 545 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 546 | resource_size_t offset = |
| 547 | ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; |
| 548 | resource_size_t size = vma->vm_end - vma->vm_start; |
| 549 | struct resource *rp; |
| 550 | |
| 551 | pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n", |
| 552 | pci_domain_nr(bus), bus->number, |
| 553 | mmap_state == pci_mmap_mem ? "MEM" : "IO", |
| 554 | (unsigned long long)offset, |
| 555 | (unsigned long long)(offset + size - 1)); |
| 556 | |
| 557 | if (mmap_state == pci_mmap_mem) { |
Benjamin Herrenschmidt | 5b11abf | 2009-02-08 14:27:21 +0000 | [diff] [blame] | 558 | /* Hack alert ! |
| 559 | * |
| 560 | * Because X is lame and can fail starting if it gets an error trying |
| 561 | * to mmap legacy_mem (instead of just moving on without legacy memory |
| 562 | * access) we fake it here by giving it anonymous memory, effectively |
| 563 | * behaving just like /dev/zero |
| 564 | */ |
| 565 | if ((offset + size) > hose->isa_mem_size) { |
| 566 | printk(KERN_DEBUG |
| 567 | "Process %s (pid:%d) mapped non-existing PCI legacy memory for 0%04x:%02x\n", |
| 568 | current->comm, current->pid, pci_domain_nr(bus), bus->number); |
| 569 | if (vma->vm_flags & VM_SHARED) |
| 570 | return shmem_zero_setup(vma); |
| 571 | return 0; |
| 572 | } |
Benjamin Herrenschmidt | e9f82cb | 2008-10-14 11:55:31 +1100 | [diff] [blame] | 573 | offset += hose->isa_mem_phys; |
| 574 | } else { |
| 575 | unsigned long io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 576 | unsigned long roffset = offset + io_offset; |
| 577 | rp = &hose->io_resource; |
| 578 | if (!(rp->flags & IORESOURCE_IO)) |
| 579 | return -ENXIO; |
| 580 | if (roffset < rp->start || (roffset + size) > rp->end) |
| 581 | return -ENXIO; |
| 582 | offset += hose->io_base_phys; |
| 583 | } |
| 584 | pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset); |
| 585 | |
| 586 | vma->vm_pgoff = offset >> PAGE_SHIFT; |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 587 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
Benjamin Herrenschmidt | e9f82cb | 2008-10-14 11:55:31 +1100 | [diff] [blame] | 588 | return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
| 589 | vma->vm_end - vma->vm_start, |
| 590 | vma->vm_page_prot); |
| 591 | } |
| 592 | |
Kumar Gala | 58083da | 2007-06-27 11:07:51 -0500 | [diff] [blame] | 593 | void pci_resource_to_user(const struct pci_dev *dev, int bar, |
| 594 | const struct resource *rsrc, |
| 595 | resource_size_t *start, resource_size_t *end) |
| 596 | { |
| 597 | struct pci_controller *hose = pci_bus_to_host(dev->bus); |
| 598 | resource_size_t offset = 0; |
| 599 | |
| 600 | if (hose == NULL) |
| 601 | return; |
| 602 | |
| 603 | if (rsrc->flags & IORESOURCE_IO) |
| 604 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 605 | |
| 606 | /* We pass a fully fixed up address to userland for MMIO instead of |
| 607 | * a BAR value because X is lame and expects to be able to use that |
| 608 | * to pass to /dev/mem ! |
| 609 | * |
| 610 | * That means that we'll have potentially 64 bits values where some |
| 611 | * userland apps only expect 32 (like X itself since it thinks only |
| 612 | * Sparc has 64 bits MMIO) but if we don't do that, we break it on |
| 613 | * 32 bits CHRPs :-( |
| 614 | * |
| 615 | * Hopefully, the sysfs insterface is immune to that gunk. Once X |
| 616 | * has been fixed (and the fix spread enough), we can re-enable the |
| 617 | * 2 lines below and pass down a BAR value to userland. In that case |
| 618 | * we'll also have to re-enable the matching code in |
| 619 | * __pci_mmap_make_offset(). |
| 620 | * |
| 621 | * BenH. |
| 622 | */ |
| 623 | #if 0 |
| 624 | else if (rsrc->flags & IORESOURCE_MEM) |
| 625 | offset = hose->pci_mem_offset; |
| 626 | #endif |
| 627 | |
| 628 | *start = rsrc->start - offset; |
| 629 | *end = rsrc->end - offset; |
| 630 | } |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 631 | |
| 632 | /** |
| 633 | * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree |
| 634 | * @hose: newly allocated pci_controller to be setup |
| 635 | * @dev: device node of the host bridge |
| 636 | * @primary: set if primary bus (32 bits only, soon to be deprecated) |
| 637 | * |
| 638 | * This function will parse the "ranges" property of a PCI host bridge device |
| 639 | * node and setup the resource mapping of a pci controller based on its |
| 640 | * content. |
| 641 | * |
| 642 | * Life would be boring if it wasn't for a few issues that we have to deal |
| 643 | * with here: |
| 644 | * |
| 645 | * - We can only cope with one IO space range and up to 3 Memory space |
| 646 | * ranges. However, some machines (thanks Apple !) tend to split their |
| 647 | * space into lots of small contiguous ranges. So we have to coalesce. |
| 648 | * |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 649 | * - Some busses have IO space not starting at 0, which causes trouble with |
| 650 | * the way we do our IO resource renumbering. The code somewhat deals with |
| 651 | * it for 64 bits but I would expect problems on 32 bits. |
| 652 | * |
| 653 | * - Some 32 bits platforms such as 4xx can have physical space larger than |
| 654 | * 32 bits so we need to use 64 bits values for the parsing |
| 655 | */ |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 656 | void pci_process_bridge_OF_ranges(struct pci_controller *hose, |
| 657 | struct device_node *dev, int primary) |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 658 | { |
Kevin Hao | 858957a | 2013-05-16 20:58:42 +0000 | [diff] [blame] | 659 | int memno = 0; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 660 | struct resource *res; |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 661 | struct of_pci_range range; |
| 662 | struct of_pci_range_parser parser; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 663 | |
| 664 | printk(KERN_INFO "PCI host bridge %s %s ranges:\n", |
| 665 | dev->full_name, primary ? "(primary)" : ""); |
| 666 | |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 667 | /* Check for ranges property */ |
| 668 | if (of_pci_range_parser_init(&parser, dev)) |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 669 | return; |
| 670 | |
| 671 | /* Parse it */ |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 672 | for_each_of_pci_range(&parser, &range) { |
Benjamin Herrenschmidt | e9f82cb | 2008-10-14 11:55:31 +1100 | [diff] [blame] | 673 | /* If we failed translation or got a zero-sized region |
| 674 | * (some FW try to feed us with non sensical zero sized regions |
| 675 | * such as power3 which look like some kind of attempt at exposing |
| 676 | * the VGA memory hole) |
| 677 | */ |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 678 | if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 679 | continue; |
| 680 | |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 681 | /* Act based on address space type */ |
| 682 | res = NULL; |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 683 | switch (range.flags & IORESOURCE_TYPE_BITS) { |
| 684 | case IORESOURCE_IO: |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 685 | printk(KERN_INFO |
| 686 | " IO 0x%016llx..0x%016llx -> 0x%016llx\n", |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 687 | range.cpu_addr, range.cpu_addr + range.size - 1, |
| 688 | range.pci_addr); |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 689 | |
| 690 | /* We support only one IO range */ |
| 691 | if (hose->pci_io_size) { |
| 692 | printk(KERN_INFO |
| 693 | " \\--> Skipped (too many) !\n"); |
| 694 | continue; |
| 695 | } |
| 696 | #ifdef CONFIG_PPC32 |
| 697 | /* On 32 bits, limit I/O space to 16MB */ |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 698 | if (range.size > 0x01000000) |
| 699 | range.size = 0x01000000; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 700 | |
| 701 | /* 32 bits needs to map IOs here */ |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 702 | hose->io_base_virt = ioremap(range.cpu_addr, |
| 703 | range.size); |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 704 | |
| 705 | /* Expect trouble if pci_addr is not 0 */ |
| 706 | if (primary) |
| 707 | isa_io_base = |
| 708 | (unsigned long)hose->io_base_virt; |
| 709 | #endif /* CONFIG_PPC32 */ |
| 710 | /* pci_io_size and io_base_phys always represent IO |
| 711 | * space starting at 0 so we factor in pci_addr |
| 712 | */ |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 713 | hose->pci_io_size = range.pci_addr + range.size; |
| 714 | hose->io_base_phys = range.cpu_addr - range.pci_addr; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 715 | |
| 716 | /* Build resource */ |
| 717 | res = &hose->io_resource; |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 718 | range.cpu_addr = range.pci_addr; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 719 | break; |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 720 | case IORESOURCE_MEM: |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 721 | printk(KERN_INFO |
| 722 | " MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n", |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 723 | range.cpu_addr, range.cpu_addr + range.size - 1, |
| 724 | range.pci_addr, |
| 725 | (range.pci_space & 0x40000000) ? |
| 726 | "Prefetch" : ""); |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 727 | |
| 728 | /* We support only 3 memory ranges */ |
| 729 | if (memno >= 3) { |
| 730 | printk(KERN_INFO |
| 731 | " \\--> Skipped (too many) !\n"); |
| 732 | continue; |
| 733 | } |
| 734 | /* Handles ISA memory hole space here */ |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 735 | if (range.pci_addr == 0) { |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 736 | if (primary || isa_mem_base == 0) |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 737 | isa_mem_base = range.cpu_addr; |
| 738 | hose->isa_mem_phys = range.cpu_addr; |
| 739 | hose->isa_mem_size = range.size; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 740 | } |
| 741 | |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 742 | /* Build resource */ |
Andrew Murray | 654837e | 2014-02-25 06:32:11 +0000 | [diff] [blame] | 743 | hose->mem_offset[memno] = range.cpu_addr - |
| 744 | range.pci_addr; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 745 | res = &hose->mem_resources[memno++]; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 746 | break; |
| 747 | } |
| 748 | if (res != NULL) { |
Michael Ellerman | aeba373 | 2014-10-16 12:29:46 +1100 | [diff] [blame] | 749 | res->name = dev->full_name; |
| 750 | res->flags = range.flags; |
| 751 | res->start = range.cpu_addr; |
| 752 | res->end = range.cpu_addr + range.size - 1; |
| 753 | res->parent = res->child = res->sibling = NULL; |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 754 | } |
| 755 | } |
Benjamin Herrenschmidt | 13dccb9 | 2007-12-11 14:48:18 +1100 | [diff] [blame] | 756 | } |
Benjamin Herrenschmidt | fa462f2 | 2007-12-20 14:54:49 +1100 | [diff] [blame] | 757 | |
| 758 | /* Decide whether to display the domain number in /proc */ |
| 759 | int pci_proc_domain(struct pci_bus *bus) |
| 760 | { |
| 761 | struct pci_controller *hose = pci_bus_to_host(bus); |
Benjamin Herrenschmidt | 1fd0f52 | 2008-10-02 14:12:51 +0000 | [diff] [blame] | 762 | |
Rob Herring | 0e47ff1 | 2011-07-12 09:25:51 -0500 | [diff] [blame] | 763 | if (!pci_has_flag(PCI_ENABLE_PROC_DOMAINS)) |
Benjamin Herrenschmidt | fa462f2 | 2007-12-20 14:54:49 +1100 | [diff] [blame] | 764 | return 0; |
Rob Herring | 0e47ff1 | 2011-07-12 09:25:51 -0500 | [diff] [blame] | 765 | if (pci_has_flag(PCI_COMPAT_DOMAIN_0)) |
Benjamin Herrenschmidt | fa462f2 | 2007-12-20 14:54:49 +1100 | [diff] [blame] | 766 | return hose->global_number != 0; |
| 767 | return 1; |
Benjamin Herrenschmidt | fa462f2 | 2007-12-20 14:54:49 +1100 | [diff] [blame] | 768 | } |
| 769 | |
Kleber Sacilotto de Souza | d82fb31 | 2013-05-03 12:43:12 +0000 | [diff] [blame] | 770 | int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) |
| 771 | { |
| 772 | if (ppc_md.pcibios_root_bridge_prepare) |
| 773 | return ppc_md.pcibios_root_bridge_prepare(bridge); |
| 774 | |
| 775 | return 0; |
| 776 | } |
| 777 | |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 778 | /* This header fixup will do the resource fixup for all devices as they are |
| 779 | * probed, but not for bridge ranges |
| 780 | */ |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 781 | static void pcibios_fixup_resources(struct pci_dev *dev) |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 782 | { |
| 783 | struct pci_controller *hose = pci_bus_to_host(dev->bus); |
| 784 | int i; |
| 785 | |
| 786 | if (!hose) { |
| 787 | printk(KERN_ERR "No host bridge for PCI dev %s !\n", |
| 788 | pci_name(dev)); |
| 789 | return; |
| 790 | } |
Wei Yang | c3b80fb | 2015-03-25 16:23:53 +0800 | [diff] [blame^] | 791 | |
| 792 | if (dev->is_virtfn) |
| 793 | return; |
| 794 | |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 795 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
| 796 | struct resource *res = dev->resource + i; |
Kevin Hao | c5df457 | 2013-06-05 02:26:51 +0000 | [diff] [blame] | 797 | struct pci_bus_region reg; |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 798 | if (!res->flags) |
| 799 | continue; |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 800 | |
| 801 | /* If we're going to re-assign everything, we mark all resources |
| 802 | * as unset (and 0-base them). In addition, we mark BARs starting |
| 803 | * at 0 as unset as well, except if PCI_PROBE_ONLY is also set |
| 804 | * since in that case, we don't want to re-assign anything |
Benjamin Herrenschmidt | 7f17289 | 2008-02-29 14:58:03 +1100 | [diff] [blame] | 805 | */ |
Yinghai Lu | fc27985 | 2013-12-09 22:54:40 -0800 | [diff] [blame] | 806 | pcibios_resource_to_bus(dev->bus, ®, res); |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 807 | if (pci_has_flag(PCI_REASSIGN_ALL_RSRC) || |
Kevin Hao | c5df457 | 2013-06-05 02:26:51 +0000 | [diff] [blame] | 808 | (reg.start == 0 && !pci_has_flag(PCI_PROBE_ONLY))) { |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 809 | /* Only print message if not re-assigning */ |
| 810 | if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) |
| 811 | pr_debug("PCI:%s Resource %d %016llx-%016llx [%x] " |
| 812 | "is unassigned\n", |
| 813 | pci_name(dev), i, |
| 814 | (unsigned long long)res->start, |
| 815 | (unsigned long long)res->end, |
| 816 | (unsigned int)res->flags); |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 817 | res->end -= res->start; |
| 818 | res->start = 0; |
| 819 | res->flags |= IORESOURCE_UNSET; |
| 820 | continue; |
| 821 | } |
| 822 | |
Bjorn Helgaas | 6c5705f | 2012-02-23 20:19:03 -0700 | [diff] [blame] | 823 | pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]\n", |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 824 | pci_name(dev), i, |
| 825 | (unsigned long long)res->start,\ |
| 826 | (unsigned long long)res->end, |
| 827 | (unsigned int)res->flags); |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 828 | } |
| 829 | |
| 830 | /* Call machine specific resource fixup */ |
| 831 | if (ppc_md.pcibios_fixup_resources) |
| 832 | ppc_md.pcibios_fixup_resources(dev); |
| 833 | } |
| 834 | DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources); |
| 835 | |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 836 | /* This function tries to figure out if a bridge resource has been initialized |
| 837 | * by the firmware or not. It doesn't have to be absolutely bullet proof, but |
| 838 | * things go more smoothly when it gets it right. It should covers cases such |
| 839 | * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges |
| 840 | */ |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 841 | static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus, |
| 842 | struct resource *res) |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 843 | { |
Benjamin Herrenschmidt | be8cbcd | 2007-12-20 14:55:04 +1100 | [diff] [blame] | 844 | struct pci_controller *hose = pci_bus_to_host(bus); |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 845 | struct pci_dev *dev = bus->self; |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 846 | resource_size_t offset; |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 847 | struct pci_bus_region region; |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 848 | u16 command; |
| 849 | int i; |
| 850 | |
| 851 | /* We don't do anything if PCI_PROBE_ONLY is set */ |
Rob Herring | 0e47ff1 | 2011-07-12 09:25:51 -0500 | [diff] [blame] | 852 | if (pci_has_flag(PCI_PROBE_ONLY)) |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 853 | return 0; |
| 854 | |
| 855 | /* Job is a bit different between memory and IO */ |
| 856 | if (res->flags & IORESOURCE_MEM) { |
Yinghai Lu | fc27985 | 2013-12-09 22:54:40 -0800 | [diff] [blame] | 857 | pcibios_resource_to_bus(dev->bus, ®ion, res); |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 858 | |
| 859 | /* If the BAR is non-0 then it's probably been initialized */ |
| 860 | if (region.start != 0) |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 861 | return 0; |
| 862 | |
| 863 | /* The BAR is 0, let's check if memory decoding is enabled on |
| 864 | * the bridge. If not, we consider it unassigned |
| 865 | */ |
| 866 | pci_read_config_word(dev, PCI_COMMAND, &command); |
| 867 | if ((command & PCI_COMMAND_MEMORY) == 0) |
| 868 | return 1; |
| 869 | |
| 870 | /* Memory decoding is enabled and the BAR is 0. If any of the bridge |
| 871 | * resources covers that starting address (0 then it's good enough for |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 872 | * us for memory space) |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 873 | */ |
| 874 | for (i = 0; i < 3; i++) { |
| 875 | if ((hose->mem_resources[i].flags & IORESOURCE_MEM) && |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 876 | hose->mem_resources[i].start == hose->mem_offset[i]) |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 877 | return 0; |
| 878 | } |
| 879 | |
| 880 | /* Well, it starts at 0 and we know it will collide so we may as |
| 881 | * well consider it as unassigned. That covers the Apple case. |
| 882 | */ |
| 883 | return 1; |
| 884 | } else { |
| 885 | /* If the BAR is non-0, then we consider it assigned */ |
| 886 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 887 | if (((res->start - offset) & 0xfffffffful) != 0) |
| 888 | return 0; |
| 889 | |
| 890 | /* Here, we are a bit different than memory as typically IO space |
| 891 | * starting at low addresses -is- valid. What we do instead if that |
| 892 | * we consider as unassigned anything that doesn't have IO enabled |
| 893 | * in the PCI command register, and that's it. |
| 894 | */ |
| 895 | pci_read_config_word(dev, PCI_COMMAND, &command); |
| 896 | if (command & PCI_COMMAND_IO) |
| 897 | return 0; |
| 898 | |
| 899 | /* It's starting at 0 and IO is disabled in the bridge, consider |
| 900 | * it unassigned |
| 901 | */ |
| 902 | return 1; |
| 903 | } |
| 904 | } |
| 905 | |
| 906 | /* Fixup resources of a PCI<->PCI bridge */ |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 907 | static void pcibios_fixup_bridge(struct pci_bus *bus) |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 908 | { |
| 909 | struct resource *res; |
| 910 | int i; |
| 911 | |
| 912 | struct pci_dev *dev = bus->self; |
| 913 | |
Bjorn Helgaas | 89a74ec | 2010-02-23 10:24:31 -0700 | [diff] [blame] | 914 | pci_bus_for_each_resource(bus, res, i) { |
| 915 | if (!res || !res->flags) |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 916 | continue; |
| 917 | if (i >= 3 && bus->self->transparent) |
| 918 | continue; |
| 919 | |
Gavin Shan | cf1a4cf | 2012-06-03 22:15:25 +0000 | [diff] [blame] | 920 | /* If we're going to reassign everything, we can |
| 921 | * shrink the P2P resource to have size as being |
| 922 | * of 0 in order to save space. |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 923 | */ |
| 924 | if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) { |
| 925 | res->flags |= IORESOURCE_UNSET; |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 926 | res->start = 0; |
Gavin Shan | cf1a4cf | 2012-06-03 22:15:25 +0000 | [diff] [blame] | 927 | res->end = -1; |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 928 | continue; |
| 929 | } |
| 930 | |
Bjorn Helgaas | 6c5705f | 2012-02-23 20:19:03 -0700 | [diff] [blame] | 931 | pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x]\n", |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 932 | pci_name(dev), i, |
| 933 | (unsigned long long)res->start,\ |
| 934 | (unsigned long long)res->end, |
| 935 | (unsigned int)res->flags); |
| 936 | |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 937 | /* Try to detect uninitialized P2P bridge resources, |
| 938 | * and clear them out so they get re-assigned later |
| 939 | */ |
| 940 | if (pcibios_uninitialized_bridge_resource(bus, res)) { |
| 941 | res->flags = 0; |
| 942 | pr_debug("PCI:%s (unassigned)\n", pci_name(dev)); |
Benjamin Herrenschmidt | b556151 | 2008-10-13 13:56:31 +0000 | [diff] [blame] | 943 | } |
| 944 | } |
| 945 | } |
| 946 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 947 | void pcibios_setup_bus_self(struct pci_bus *bus) |
Benjamin Herrenschmidt | 8b8da35 | 2008-10-27 19:48:37 +0000 | [diff] [blame] | 948 | { |
Benjamin Herrenschmidt | 7eef440 | 2008-10-27 19:48:56 +0000 | [diff] [blame] | 949 | /* Fix up the bus resources for P2P bridges */ |
Benjamin Herrenschmidt | 8b8da35 | 2008-10-27 19:48:37 +0000 | [diff] [blame] | 950 | if (bus->self != NULL) |
| 951 | pcibios_fixup_bridge(bus); |
| 952 | |
| 953 | /* Platform specific bus fixups. This is currently only used |
Benjamin Herrenschmidt | 7eef440 | 2008-10-27 19:48:56 +0000 | [diff] [blame] | 954 | * by fsl_pci and I'm hoping to get rid of it at some point |
Benjamin Herrenschmidt | 8b8da35 | 2008-10-27 19:48:37 +0000 | [diff] [blame] | 955 | */ |
| 956 | if (ppc_md.pcibios_fixup_bus) |
| 957 | ppc_md.pcibios_fixup_bus(bus); |
| 958 | |
| 959 | /* Setup bus DMA mappings */ |
| 960 | if (ppc_md.pci_dma_bus_setup) |
| 961 | ppc_md.pci_dma_bus_setup(bus); |
| 962 | } |
| 963 | |
Guenter Roeck | 7846de4 | 2013-06-10 10:18:08 -0700 | [diff] [blame] | 964 | static void pcibios_setup_device(struct pci_dev *dev) |
Yuanquan Chen | 37f0219 | 2013-04-02 01:26:54 +0000 | [diff] [blame] | 965 | { |
| 966 | /* Fixup NUMA node as it may not be setup yet by the generic |
| 967 | * code and is needed by the DMA init |
| 968 | */ |
| 969 | set_dev_node(&dev->dev, pcibus_to_node(dev->bus)); |
| 970 | |
| 971 | /* Hook up default DMA ops */ |
| 972 | set_dma_ops(&dev->dev, pci_dma_ops); |
| 973 | set_dma_offset(&dev->dev, PCI_DRAM_OFFSET); |
| 974 | |
| 975 | /* Additional platform DMA/iommu setup */ |
| 976 | if (ppc_md.pci_dma_dev_setup) |
| 977 | ppc_md.pci_dma_dev_setup(dev); |
| 978 | |
| 979 | /* Read default IRQs and fixup if necessary */ |
| 980 | pci_read_irq_line(dev); |
| 981 | if (ppc_md.pci_irq_fixup) |
| 982 | ppc_md.pci_irq_fixup(dev); |
| 983 | } |
| 984 | |
Guenter Roeck | 7846de4 | 2013-06-10 10:18:08 -0700 | [diff] [blame] | 985 | int pcibios_add_device(struct pci_dev *dev) |
| 986 | { |
| 987 | /* |
| 988 | * We can only call pcibios_setup_device() after bus setup is complete, |
| 989 | * since some of the platform specific DMA setup code depends on it. |
| 990 | */ |
| 991 | if (dev->bus->is_added) |
| 992 | pcibios_setup_device(dev); |
| 993 | return 0; |
| 994 | } |
| 995 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 996 | void pcibios_setup_bus_devices(struct pci_bus *bus) |
Benjamin Herrenschmidt | 7eef440 | 2008-10-27 19:48:56 +0000 | [diff] [blame] | 997 | { |
| 998 | struct pci_dev *dev; |
| 999 | |
| 1000 | pr_debug("PCI: Fixup bus devices %d (%s)\n", |
| 1001 | bus->number, bus->self ? pci_name(bus->self) : "PHB"); |
| 1002 | |
| 1003 | list_for_each_entry(dev, &bus->devices, bus_list) { |
Benjamin Herrenschmidt | 2d1c861 | 2009-12-09 17:52:13 +1100 | [diff] [blame] | 1004 | /* Cardbus can call us to add new devices to a bus, so ignore |
| 1005 | * those who are already fully discovered |
| 1006 | */ |
| 1007 | if (dev->is_added) |
| 1008 | continue; |
| 1009 | |
Yuanquan Chen | 37f0219 | 2013-04-02 01:26:54 +0000 | [diff] [blame] | 1010 | pcibios_setup_device(dev); |
Benjamin Herrenschmidt | 7eef440 | 2008-10-27 19:48:56 +0000 | [diff] [blame] | 1011 | } |
| 1012 | } |
| 1013 | |
Myron Stowe | 79c8be8 | 2011-10-28 15:48:03 -0600 | [diff] [blame] | 1014 | void pcibios_set_master(struct pci_dev *dev) |
| 1015 | { |
| 1016 | /* No special bus mastering setup handling */ |
| 1017 | } |
| 1018 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 1019 | void pcibios_fixup_bus(struct pci_bus *bus) |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 1020 | { |
| 1021 | /* When called from the generic PCI probe, read PCI<->PCI bridge |
Benjamin Herrenschmidt | 7eef440 | 2008-10-27 19:48:56 +0000 | [diff] [blame] | 1022 | * bases. This is -not- called when generating the PCI tree from |
Benjamin Herrenschmidt | 8b8da35 | 2008-10-27 19:48:37 +0000 | [diff] [blame] | 1023 | * the OF device-tree. |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 1024 | */ |
Gavin Shan | 1a85d66 | 2013-07-31 16:43:56 +0800 | [diff] [blame] | 1025 | pci_read_bridge_bases(bus); |
Benjamin Herrenschmidt | 8b8da35 | 2008-10-27 19:48:37 +0000 | [diff] [blame] | 1026 | |
| 1027 | /* Now fixup the bus bus */ |
| 1028 | pcibios_setup_bus_self(bus); |
| 1029 | |
| 1030 | /* Now fixup devices on that bus */ |
| 1031 | pcibios_setup_bus_devices(bus); |
Benjamin Herrenschmidt | bf5e2ba | 2007-12-20 14:54:51 +1100 | [diff] [blame] | 1032 | } |
| 1033 | EXPORT_SYMBOL(pcibios_fixup_bus); |
| 1034 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 1035 | void pci_fixup_cardbus(struct pci_bus *bus) |
Benjamin Herrenschmidt | 2d1c861 | 2009-12-09 17:52:13 +1100 | [diff] [blame] | 1036 | { |
| 1037 | /* Now fixup devices on that bus */ |
| 1038 | pcibios_setup_bus_devices(bus); |
| 1039 | } |
| 1040 | |
| 1041 | |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1042 | static int skip_isa_ioresource_align(struct pci_dev *dev) |
| 1043 | { |
Rob Herring | 0e47ff1 | 2011-07-12 09:25:51 -0500 | [diff] [blame] | 1044 | if (pci_has_flag(PCI_CAN_SKIP_ISA_ALIGN) && |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1045 | !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA)) |
| 1046 | return 1; |
| 1047 | return 0; |
| 1048 | } |
| 1049 | |
| 1050 | /* |
| 1051 | * We need to avoid collisions with `mirrored' VGA ports |
| 1052 | * and other strange ISA hardware, so we always want the |
| 1053 | * addresses to be allocated in the 0x000-0x0ff region |
| 1054 | * modulo 0x400. |
| 1055 | * |
| 1056 | * Why? Because some silly external IO cards only decode |
| 1057 | * the low 10 bits of the IO address. The 0x00-0xff region |
| 1058 | * is reserved for motherboard devices that decode all 16 |
| 1059 | * bits, so it's ok to allocate at, say, 0x2800-0x28ff, |
| 1060 | * but we want to try to avoid allocating at 0x2900-0x2bff |
| 1061 | * which might have be mirrored at 0x0100-0x03ff.. |
| 1062 | */ |
Dominik Brodowski | 3b7a17f | 2010-01-01 17:40:50 +0100 | [diff] [blame] | 1063 | resource_size_t pcibios_align_resource(void *data, const struct resource *res, |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1064 | resource_size_t size, resource_size_t align) |
| 1065 | { |
| 1066 | struct pci_dev *dev = data; |
Dominik Brodowski | b26b2d4 | 2010-01-01 17:40:49 +0100 | [diff] [blame] | 1067 | resource_size_t start = res->start; |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1068 | |
| 1069 | if (res->flags & IORESOURCE_IO) { |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1070 | if (skip_isa_ioresource_align(dev)) |
Dominik Brodowski | b26b2d4 | 2010-01-01 17:40:49 +0100 | [diff] [blame] | 1071 | return start; |
| 1072 | if (start & 0x300) |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1073 | start = (start + 0x3ff) & ~0x3ff; |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1074 | } |
Dominik Brodowski | b26b2d4 | 2010-01-01 17:40:49 +0100 | [diff] [blame] | 1075 | |
| 1076 | return start; |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1077 | } |
| 1078 | EXPORT_SYMBOL(pcibios_align_resource); |
| 1079 | |
| 1080 | /* |
| 1081 | * Reparent resource children of pr that conflict with res |
| 1082 | * under res, and make res replace those children. |
| 1083 | */ |
Heiko Schocher | 0f6023d | 2009-09-24 02:45:14 +0000 | [diff] [blame] | 1084 | static int reparent_resources(struct resource *parent, |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1085 | struct resource *res) |
| 1086 | { |
| 1087 | struct resource *p, **pp; |
| 1088 | struct resource **firstpp = NULL; |
| 1089 | |
| 1090 | for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) { |
| 1091 | if (p->end < res->start) |
| 1092 | continue; |
| 1093 | if (res->end < p->start) |
| 1094 | break; |
| 1095 | if (p->start < res->start || p->end > res->end) |
| 1096 | return -1; /* not completely contained */ |
| 1097 | if (firstpp == NULL) |
| 1098 | firstpp = pp; |
| 1099 | } |
| 1100 | if (firstpp == NULL) |
| 1101 | return -1; /* didn't find any conflicting entries? */ |
| 1102 | res->parent = parent; |
| 1103 | res->child = *firstpp; |
| 1104 | res->sibling = *pp; |
| 1105 | *firstpp = res; |
| 1106 | *pp = NULL; |
| 1107 | for (p = res->child; p != NULL; p = p->sibling) { |
| 1108 | p->parent = res; |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 1109 | pr_debug("PCI: Reparented %s [%llx..%llx] under %s\n", |
| 1110 | p->name, |
| 1111 | (unsigned long long)p->start, |
| 1112 | (unsigned long long)p->end, res->name); |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1113 | } |
| 1114 | return 0; |
| 1115 | } |
| 1116 | |
| 1117 | /* |
| 1118 | * Handle resources of PCI devices. If the world were perfect, we could |
| 1119 | * just allocate all the resource regions and do nothing more. It isn't. |
| 1120 | * On the other hand, we cannot just re-allocate all devices, as it would |
| 1121 | * require us to know lots of host bridge internals. So we attempt to |
| 1122 | * keep as much of the original configuration as possible, but tweak it |
| 1123 | * when it's found to be wrong. |
| 1124 | * |
| 1125 | * Known BIOS problems we have to work around: |
| 1126 | * - I/O or memory regions not configured |
| 1127 | * - regions configured, but not enabled in the command register |
| 1128 | * - bogus I/O addresses above 64K used |
| 1129 | * - expansion ROMs left enabled (this may sound harmless, but given |
| 1130 | * the fact the PCI specs explicitly allow address decoders to be |
| 1131 | * shared between expansion ROMs and other resource regions, it's |
| 1132 | * at least dangerous) |
| 1133 | * |
| 1134 | * Our solution: |
| 1135 | * (1) Allocate resources for all buses behind PCI-to-PCI bridges. |
| 1136 | * This gives us fixed barriers on where we can allocate. |
| 1137 | * (2) Allocate resources for all enabled devices. If there is |
| 1138 | * a collision, just mark the resource as unallocated. Also |
| 1139 | * disable expansion ROMs during this step. |
| 1140 | * (3) Try to allocate resources for disabled devices. If the |
| 1141 | * resources were assigned correctly, everything goes well, |
| 1142 | * if they weren't, they won't disturb allocation of other |
| 1143 | * resources. |
| 1144 | * (4) Assign new addresses to resources which were either |
| 1145 | * not configured at all or misconfigured. If explicitly |
| 1146 | * requested by the user, configure expansion ROM address |
| 1147 | * as well. |
| 1148 | */ |
| 1149 | |
Anton Blanchard | e51df2c | 2014-08-20 08:55:18 +1000 | [diff] [blame] | 1150 | static void pcibios_allocate_bus_resources(struct pci_bus *bus) |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1151 | { |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1152 | struct pci_bus *b; |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1153 | int i; |
| 1154 | struct resource *res, *pr; |
| 1155 | |
Benjamin Herrenschmidt | b5ae5f9 | 2008-10-27 19:48:44 +0000 | [diff] [blame] | 1156 | pr_debug("PCI: Allocating bus resources for %04x:%02x...\n", |
| 1157 | pci_domain_nr(bus), bus->number); |
| 1158 | |
Bjorn Helgaas | 89a74ec | 2010-02-23 10:24:31 -0700 | [diff] [blame] | 1159 | pci_bus_for_each_resource(bus, res, i) { |
| 1160 | if (!res || !res->flags || res->start > res->end || res->parent) |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1161 | continue; |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 1162 | |
| 1163 | /* If the resource was left unset at this point, we clear it */ |
| 1164 | if (res->flags & IORESOURCE_UNSET) |
| 1165 | goto clear_resource; |
| 1166 | |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1167 | if (bus->parent == NULL) |
| 1168 | pr = (res->flags & IORESOURCE_IO) ? |
| 1169 | &ioport_resource : &iomem_resource; |
| 1170 | else { |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1171 | pr = pci_find_parent_resource(bus->self, res); |
| 1172 | if (pr == res) { |
| 1173 | /* this happens when the generic PCI |
| 1174 | * code (wrongly) decides that this |
| 1175 | * bridge is transparent -- paulus |
| 1176 | */ |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1177 | continue; |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1178 | } |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1179 | } |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1180 | |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 1181 | pr_debug("PCI: %s (bus %d) bridge rsrc %d: %016llx-%016llx " |
| 1182 | "[0x%x], parent %p (%s)\n", |
| 1183 | bus->self ? pci_name(bus->self) : "PHB", |
| 1184 | bus->number, i, |
| 1185 | (unsigned long long)res->start, |
| 1186 | (unsigned long long)res->end, |
| 1187 | (unsigned int)res->flags, |
| 1188 | pr, (pr && pr->name) ? pr->name : "nil"); |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1189 | |
| 1190 | if (pr && !(pr->flags & IORESOURCE_UNSET)) { |
Yinghai Lu | 3ebfe46 | 2015-01-15 16:21:51 -0600 | [diff] [blame] | 1191 | struct pci_dev *dev = bus->self; |
| 1192 | |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1193 | if (request_resource(pr, res) == 0) |
| 1194 | continue; |
| 1195 | /* |
| 1196 | * Must be a conflict with an existing entry. |
| 1197 | * Move that entry (or entries) under the |
| 1198 | * bridge resource and try again. |
| 1199 | */ |
| 1200 | if (reparent_resources(pr, res) == 0) |
| 1201 | continue; |
Yinghai Lu | 3ebfe46 | 2015-01-15 16:21:51 -0600 | [diff] [blame] | 1202 | |
| 1203 | if (dev && i < PCI_BRIDGE_RESOURCE_NUM && |
| 1204 | pci_claim_bridge_resource(dev, |
| 1205 | i + PCI_BRIDGE_RESOURCES) == 0) |
| 1206 | continue; |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1207 | } |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 1208 | pr_warning("PCI: Cannot allocate resource region " |
| 1209 | "%d of PCI bridge %d, will remap\n", i, bus->number); |
| 1210 | clear_resource: |
Gavin Shan | cf1a4cf | 2012-06-03 22:15:25 +0000 | [diff] [blame] | 1211 | /* The resource might be figured out when doing |
| 1212 | * reassignment based on the resources required |
| 1213 | * by the downstream PCI devices. Here we set |
| 1214 | * the size of the resource to be 0 in order to |
| 1215 | * save more space. |
| 1216 | */ |
| 1217 | res->start = 0; |
| 1218 | res->end = -1; |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1219 | res->flags = 0; |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1220 | } |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1221 | |
| 1222 | list_for_each_entry(b, &bus->children, node) |
| 1223 | pcibios_allocate_bus_resources(b); |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1224 | } |
| 1225 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 1226 | static inline void alloc_resource(struct pci_dev *dev, int idx) |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1227 | { |
| 1228 | struct resource *pr, *r = &dev->resource[idx]; |
| 1229 | |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 1230 | pr_debug("PCI: Allocating %s: Resource %d: %016llx..%016llx [%x]\n", |
| 1231 | pci_name(dev), idx, |
| 1232 | (unsigned long long)r->start, |
| 1233 | (unsigned long long)r->end, |
| 1234 | (unsigned int)r->flags); |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1235 | |
| 1236 | pr = pci_find_parent_resource(dev, r); |
| 1237 | if (!pr || (pr->flags & IORESOURCE_UNSET) || |
| 1238 | request_resource(pr, r) < 0) { |
| 1239 | printk(KERN_WARNING "PCI: Cannot allocate resource region %d" |
| 1240 | " of device %s, will remap\n", idx, pci_name(dev)); |
| 1241 | if (pr) |
Benjamin Herrenschmidt | b0494bc | 2008-10-27 19:48:22 +0000 | [diff] [blame] | 1242 | pr_debug("PCI: parent is %p: %016llx-%016llx [%x]\n", |
| 1243 | pr, |
| 1244 | (unsigned long long)pr->start, |
| 1245 | (unsigned long long)pr->end, |
| 1246 | (unsigned int)pr->flags); |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1247 | /* We'll assign a new address later */ |
| 1248 | r->flags |= IORESOURCE_UNSET; |
| 1249 | r->end -= r->start; |
| 1250 | r->start = 0; |
| 1251 | } |
| 1252 | } |
| 1253 | |
| 1254 | static void __init pcibios_allocate_resources(int pass) |
| 1255 | { |
| 1256 | struct pci_dev *dev = NULL; |
| 1257 | int idx, disabled; |
| 1258 | u16 command; |
| 1259 | struct resource *r; |
| 1260 | |
| 1261 | for_each_pci_dev(dev) { |
| 1262 | pci_read_config_word(dev, PCI_COMMAND, &command); |
Benjamin Herrenschmidt | ad892a6 | 2009-05-14 20:16:47 +0000 | [diff] [blame] | 1263 | for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) { |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1264 | r = &dev->resource[idx]; |
| 1265 | if (r->parent) /* Already allocated */ |
| 1266 | continue; |
| 1267 | if (!r->flags || (r->flags & IORESOURCE_UNSET)) |
| 1268 | continue; /* Not assigned at all */ |
Benjamin Herrenschmidt | ad892a6 | 2009-05-14 20:16:47 +0000 | [diff] [blame] | 1269 | /* We only allocate ROMs on pass 1 just in case they |
| 1270 | * have been screwed up by firmware |
| 1271 | */ |
| 1272 | if (idx == PCI_ROM_RESOURCE ) |
| 1273 | disabled = 1; |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1274 | if (r->flags & IORESOURCE_IO) |
| 1275 | disabled = !(command & PCI_COMMAND_IO); |
| 1276 | else |
| 1277 | disabled = !(command & PCI_COMMAND_MEMORY); |
Paul Mackerras | 533b192 | 2007-12-31 10:04:15 +1100 | [diff] [blame] | 1278 | if (pass == disabled) |
| 1279 | alloc_resource(dev, idx); |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1280 | } |
| 1281 | if (pass) |
| 1282 | continue; |
| 1283 | r = &dev->resource[PCI_ROM_RESOURCE]; |
Benjamin Herrenschmidt | ad892a6 | 2009-05-14 20:16:47 +0000 | [diff] [blame] | 1284 | if (r->flags) { |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1285 | /* Turn the ROM off, leave the resource region, |
| 1286 | * but keep it unregistered. |
| 1287 | */ |
| 1288 | u32 reg; |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1289 | pci_read_config_dword(dev, dev->rom_base_reg, ®); |
Benjamin Herrenschmidt | ad892a6 | 2009-05-14 20:16:47 +0000 | [diff] [blame] | 1290 | if (reg & PCI_ROM_ADDRESS_ENABLE) { |
| 1291 | pr_debug("PCI: Switching off ROM of %s\n", |
| 1292 | pci_name(dev)); |
| 1293 | r->flags &= ~IORESOURCE_ROM_ENABLE; |
| 1294 | pci_write_config_dword(dev, dev->rom_base_reg, |
| 1295 | reg & ~PCI_ROM_ADDRESS_ENABLE); |
| 1296 | } |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1297 | } |
| 1298 | } |
| 1299 | } |
| 1300 | |
Benjamin Herrenschmidt | c1f3430 | 2008-11-11 17:45:52 +0000 | [diff] [blame] | 1301 | static void __init pcibios_reserve_legacy_regions(struct pci_bus *bus) |
| 1302 | { |
| 1303 | struct pci_controller *hose = pci_bus_to_host(bus); |
| 1304 | resource_size_t offset; |
| 1305 | struct resource *res, *pres; |
| 1306 | int i; |
| 1307 | |
| 1308 | pr_debug("Reserving legacy ranges for domain %04x\n", pci_domain_nr(bus)); |
| 1309 | |
| 1310 | /* Check for IO */ |
| 1311 | if (!(hose->io_resource.flags & IORESOURCE_IO)) |
| 1312 | goto no_io; |
| 1313 | offset = (unsigned long)hose->io_base_virt - _IO_BASE; |
| 1314 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
| 1315 | BUG_ON(res == NULL); |
| 1316 | res->name = "Legacy IO"; |
| 1317 | res->flags = IORESOURCE_IO; |
| 1318 | res->start = offset; |
| 1319 | res->end = (offset + 0xfff) & 0xfffffffful; |
| 1320 | pr_debug("Candidate legacy IO: %pR\n", res); |
| 1321 | if (request_resource(&hose->io_resource, res)) { |
| 1322 | printk(KERN_DEBUG |
| 1323 | "PCI %04x:%02x Cannot reserve Legacy IO %pR\n", |
| 1324 | pci_domain_nr(bus), bus->number, res); |
| 1325 | kfree(res); |
| 1326 | } |
| 1327 | |
| 1328 | no_io: |
| 1329 | /* Check for memory */ |
Benjamin Herrenschmidt | c1f3430 | 2008-11-11 17:45:52 +0000 | [diff] [blame] | 1330 | for (i = 0; i < 3; i++) { |
| 1331 | pres = &hose->mem_resources[i]; |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 1332 | offset = hose->mem_offset[i]; |
Benjamin Herrenschmidt | c1f3430 | 2008-11-11 17:45:52 +0000 | [diff] [blame] | 1333 | if (!(pres->flags & IORESOURCE_MEM)) |
| 1334 | continue; |
| 1335 | pr_debug("hose mem res: %pR\n", pres); |
| 1336 | if ((pres->start - offset) <= 0xa0000 && |
| 1337 | (pres->end - offset) >= 0xbffff) |
| 1338 | break; |
| 1339 | } |
| 1340 | if (i >= 3) |
| 1341 | return; |
| 1342 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
| 1343 | BUG_ON(res == NULL); |
| 1344 | res->name = "Legacy VGA memory"; |
| 1345 | res->flags = IORESOURCE_MEM; |
| 1346 | res->start = 0xa0000 + offset; |
| 1347 | res->end = 0xbffff + offset; |
| 1348 | pr_debug("Candidate VGA memory: %pR\n", res); |
| 1349 | if (request_resource(pres, res)) { |
| 1350 | printk(KERN_DEBUG |
| 1351 | "PCI %04x:%02x Cannot reserve VGA memory %pR\n", |
| 1352 | pci_domain_nr(bus), bus->number, res); |
| 1353 | kfree(res); |
| 1354 | } |
| 1355 | } |
| 1356 | |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1357 | void __init pcibios_resource_survey(void) |
| 1358 | { |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1359 | struct pci_bus *b; |
| 1360 | |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 1361 | /* Allocate and assign resources */ |
Nathan Fontenot | e90a131 | 2008-10-27 19:48:17 +0000 | [diff] [blame] | 1362 | list_for_each_entry(b, &pci_root_buses, node) |
| 1363 | pcibios_allocate_bus_resources(b); |
Benjamin Herrenschmidt | 48c2ce9 | 2011-11-06 18:55:58 +0000 | [diff] [blame] | 1364 | pcibios_allocate_resources(0); |
| 1365 | pcibios_allocate_resources(1); |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1366 | |
Benjamin Herrenschmidt | c1f3430 | 2008-11-11 17:45:52 +0000 | [diff] [blame] | 1367 | /* Before we start assigning unassigned resource, we try to reserve |
| 1368 | * the low IO area and the VGA memory area if they intersect the |
| 1369 | * bus available resources to avoid allocating things on top of them |
| 1370 | */ |
Rob Herring | 0e47ff1 | 2011-07-12 09:25:51 -0500 | [diff] [blame] | 1371 | if (!pci_has_flag(PCI_PROBE_ONLY)) { |
Benjamin Herrenschmidt | c1f3430 | 2008-11-11 17:45:52 +0000 | [diff] [blame] | 1372 | list_for_each_entry(b, &pci_root_buses, node) |
| 1373 | pcibios_reserve_legacy_regions(b); |
| 1374 | } |
| 1375 | |
| 1376 | /* Now, if the platform didn't decide to blindly trust the firmware, |
| 1377 | * we proceed to assigning things that were left unassigned |
| 1378 | */ |
Rob Herring | 0e47ff1 | 2011-07-12 09:25:51 -0500 | [diff] [blame] | 1379 | if (!pci_has_flag(PCI_PROBE_ONLY)) { |
Wolfram Sang | a77acda | 2009-03-09 06:39:01 +0000 | [diff] [blame] | 1380 | pr_debug("PCI: Assigning unassigned resources...\n"); |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1381 | pci_assign_unassigned_resources(); |
| 1382 | } |
| 1383 | |
| 1384 | /* Call machine dependent fixup */ |
| 1385 | if (ppc_md.pcibios_fixup) |
| 1386 | ppc_md.pcibios_fixup(); |
| 1387 | } |
| 1388 | |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 1389 | /* This is used by the PCI hotplug driver to allocate resource |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1390 | * of newly plugged busses. We can try to consolidate with the |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 1391 | * rest of the code later, for now, keep it as-is as our main |
| 1392 | * resource allocation function doesn't deal with sub-trees yet. |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1393 | */ |
Stephen Rothwell | baf75b0 | 2009-06-01 14:53:53 +0000 | [diff] [blame] | 1394 | void pcibios_claim_one_bus(struct pci_bus *bus) |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1395 | { |
| 1396 | struct pci_dev *dev; |
| 1397 | struct pci_bus *child_bus; |
| 1398 | |
| 1399 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 1400 | int i; |
| 1401 | |
| 1402 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
| 1403 | struct resource *r = &dev->resource[i]; |
| 1404 | |
| 1405 | if (r->parent || !r->start || !r->flags) |
| 1406 | continue; |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 1407 | |
| 1408 | pr_debug("PCI: Claiming %s: " |
| 1409 | "Resource %d: %016llx..%016llx [%x]\n", |
| 1410 | pci_name(dev), i, |
| 1411 | (unsigned long long)r->start, |
| 1412 | (unsigned long long)r->end, |
| 1413 | (unsigned int)r->flags); |
| 1414 | |
Yinghai Lu | 3ebfe46 | 2015-01-15 16:21:51 -0600 | [diff] [blame] | 1415 | if (pci_claim_resource(dev, i) == 0) |
| 1416 | continue; |
| 1417 | |
| 1418 | pci_claim_bridge_resource(dev, i); |
Benjamin Herrenschmidt | 3fd94c6 | 2007-12-20 14:54:53 +1100 | [diff] [blame] | 1419 | } |
| 1420 | } |
| 1421 | |
| 1422 | list_for_each_entry(child_bus, &bus->children, node) |
| 1423 | pcibios_claim_one_bus(child_bus); |
| 1424 | } |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 1425 | |
| 1426 | |
| 1427 | /* pcibios_finish_adding_to_bus |
| 1428 | * |
| 1429 | * This is to be called by the hotplug code after devices have been |
| 1430 | * added to a bus, this include calling it for a PHB that is just |
| 1431 | * being added |
| 1432 | */ |
| 1433 | void pcibios_finish_adding_to_bus(struct pci_bus *bus) |
| 1434 | { |
| 1435 | pr_debug("PCI: Finishing adding to hotplug bus %04x:%02x\n", |
| 1436 | pci_domain_nr(bus), bus->number); |
| 1437 | |
| 1438 | /* Allocate bus and devices resources */ |
| 1439 | pcibios_allocate_bus_resources(bus); |
| 1440 | pcibios_claim_one_bus(bus); |
Gavin Shan | ab444ec | 2013-07-24 10:24:57 +0800 | [diff] [blame] | 1441 | if (!pci_has_flag(PCI_PROBE_ONLY)) |
| 1442 | pci_assign_unassigned_bus_resources(bus); |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 1443 | |
Thadeu Lima de Souza Cascardo | 6a040ce | 2012-12-28 09:13:19 +0000 | [diff] [blame] | 1444 | /* Fixup EEH */ |
| 1445 | eeh_add_device_tree_late(bus); |
| 1446 | |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 1447 | /* Add new devices to global lists. Register in proc, sysfs. */ |
| 1448 | pci_bus_add_devices(bus); |
| 1449 | |
Thadeu Lima de Souza Cascardo | 6a040ce | 2012-12-28 09:13:19 +0000 | [diff] [blame] | 1450 | /* sysfs files should only be added after devices are added */ |
| 1451 | eeh_add_sysfs_files(bus); |
Benjamin Herrenschmidt | fd6852c | 2008-10-27 19:48:52 +0000 | [diff] [blame] | 1452 | } |
| 1453 | EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus); |
| 1454 | |
Benjamin Herrenschmidt | 549beb9 | 2007-12-20 14:54:57 +1100 | [diff] [blame] | 1455 | int pcibios_enable_device(struct pci_dev *dev, int mask) |
| 1456 | { |
Benjamin Herrenschmidt | 549beb9 | 2007-12-20 14:54:57 +1100 | [diff] [blame] | 1457 | if (ppc_md.pcibios_enable_device_hook) |
| 1458 | if (ppc_md.pcibios_enable_device_hook(dev)) |
| 1459 | return -EINVAL; |
| 1460 | |
Bjorn Helgaas | 7cfb5f9 | 2008-03-04 11:56:56 -0700 | [diff] [blame] | 1461 | return pci_enable_resources(dev, mask); |
Benjamin Herrenschmidt | 549beb9 | 2007-12-20 14:54:57 +1100 | [diff] [blame] | 1462 | } |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1463 | |
Bjorn Helgaas | 38973ba | 2012-03-16 17:48:09 -0600 | [diff] [blame] | 1464 | resource_size_t pcibios_io_space_offset(struct pci_controller *hose) |
| 1465 | { |
| 1466 | return (unsigned long) hose->io_base_virt - _IO_BASE; |
| 1467 | } |
| 1468 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 1469 | static void pcibios_setup_phb_resources(struct pci_controller *hose, |
| 1470 | struct list_head *resources) |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1471 | { |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1472 | struct resource *res; |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 1473 | resource_size_t offset; |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1474 | int i; |
| 1475 | |
| 1476 | /* Hookup PHB IO resource */ |
Bjorn Helgaas | 45a709f | 2011-10-28 16:27:43 -0600 | [diff] [blame] | 1477 | res = &hose->io_resource; |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1478 | |
| 1479 | if (!res->flags) { |
Anton Blanchard | adb7cd7 | 2014-10-14 11:40:26 +1100 | [diff] [blame] | 1480 | pr_info("PCI: I/O resource not set for host" |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1481 | " bridge %s (domain %d)\n", |
| 1482 | hose->dn->full_name, hose->global_number); |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 1483 | } else { |
| 1484 | offset = pcibios_io_space_offset(hose); |
| 1485 | |
| 1486 | pr_debug("PCI: PHB IO resource = %08llx-%08llx [%lx] off 0x%08llx\n", |
Benjamin Herrenschmidt | a0b8e76 | 2013-05-04 14:22:57 +0000 | [diff] [blame] | 1487 | (unsigned long long)res->start, |
| 1488 | (unsigned long long)res->end, |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 1489 | (unsigned long)res->flags, |
| 1490 | (unsigned long long)offset); |
| 1491 | pci_add_resource_offset(resources, res, offset); |
Benjamin Herrenschmidt | a0b8e76 | 2013-05-04 14:22:57 +0000 | [diff] [blame] | 1492 | } |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1493 | |
| 1494 | /* Hookup PHB Memory resources */ |
| 1495 | for (i = 0; i < 3; ++i) { |
| 1496 | res = &hose->mem_resources[i]; |
| 1497 | if (!res->flags) { |
Benjamin Herrenschmidt | bee7dd9 | 2013-05-20 17:24:39 +0000 | [diff] [blame] | 1498 | if (i == 0) |
| 1499 | printk(KERN_ERR "PCI: Memory resource 0 not set for " |
| 1500 | "host bridge %s (domain %d)\n", |
| 1501 | hose->dn->full_name, hose->global_number); |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 1502 | continue; |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1503 | } |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 1504 | offset = hose->mem_offset[i]; |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1505 | |
Benjamin Herrenschmidt | 3fd47f0 | 2013-05-06 13:40:40 +1000 | [diff] [blame] | 1506 | |
| 1507 | pr_debug("PCI: PHB MEM resource %d = %08llx-%08llx [%lx] off 0x%08llx\n", i, |
| 1508 | (unsigned long long)res->start, |
| 1509 | (unsigned long long)res->end, |
| 1510 | (unsigned long)res->flags, |
| 1511 | (unsigned long long)offset); |
| 1512 | |
| 1513 | pci_add_resource_offset(resources, res, offset); |
| 1514 | } |
Benjamin Herrenschmidt | 5328032 | 2008-10-27 19:48:29 +0000 | [diff] [blame] | 1515 | } |
Kumar Gala | 89c2dd6 | 2009-08-25 16:20:45 +0000 | [diff] [blame] | 1516 | |
| 1517 | /* |
| 1518 | * Null PCI config access functions, for the case when we can't |
| 1519 | * find a hose. |
| 1520 | */ |
| 1521 | #define NULL_PCI_OP(rw, size, type) \ |
| 1522 | static int \ |
| 1523 | null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ |
| 1524 | { \ |
| 1525 | return PCIBIOS_DEVICE_NOT_FOUND; \ |
| 1526 | } |
| 1527 | |
| 1528 | static int |
| 1529 | null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, |
| 1530 | int len, u32 *val) |
| 1531 | { |
| 1532 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 1533 | } |
| 1534 | |
| 1535 | static int |
| 1536 | null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, |
| 1537 | int len, u32 val) |
| 1538 | { |
| 1539 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 1540 | } |
| 1541 | |
| 1542 | static struct pci_ops null_pci_ops = |
| 1543 | { |
| 1544 | .read = null_read_config, |
| 1545 | .write = null_write_config, |
| 1546 | }; |
| 1547 | |
| 1548 | /* |
| 1549 | * These functions are used early on before PCI scanning is done |
| 1550 | * and all of the pci_dev and pci_bus structures have been created. |
| 1551 | */ |
| 1552 | static struct pci_bus * |
| 1553 | fake_pci_bus(struct pci_controller *hose, int busnr) |
| 1554 | { |
| 1555 | static struct pci_bus bus; |
| 1556 | |
Anton Blanchard | b0d436c | 2013-08-07 02:01:24 +1000 | [diff] [blame] | 1557 | if (hose == NULL) { |
Kumar Gala | 89c2dd6 | 2009-08-25 16:20:45 +0000 | [diff] [blame] | 1558 | printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr); |
| 1559 | } |
| 1560 | bus.number = busnr; |
| 1561 | bus.sysdata = hose; |
| 1562 | bus.ops = hose? hose->ops: &null_pci_ops; |
| 1563 | return &bus; |
| 1564 | } |
| 1565 | |
| 1566 | #define EARLY_PCI_OP(rw, size, type) \ |
| 1567 | int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ |
| 1568 | int devfn, int offset, type value) \ |
| 1569 | { \ |
| 1570 | return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ |
| 1571 | devfn, offset, value); \ |
| 1572 | } |
| 1573 | |
| 1574 | EARLY_PCI_OP(read, byte, u8 *) |
| 1575 | EARLY_PCI_OP(read, word, u16 *) |
| 1576 | EARLY_PCI_OP(read, dword, u32 *) |
| 1577 | EARLY_PCI_OP(write, byte, u8) |
| 1578 | EARLY_PCI_OP(write, word, u16) |
| 1579 | EARLY_PCI_OP(write, dword, u32) |
| 1580 | |
Kumar Gala | 89c2dd6 | 2009-08-25 16:20:45 +0000 | [diff] [blame] | 1581 | int early_find_capability(struct pci_controller *hose, int bus, int devfn, |
| 1582 | int cap) |
| 1583 | { |
| 1584 | return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap); |
| 1585 | } |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1586 | |
Benjamin Herrenschmidt | 98d9f30c8 | 2011-04-11 11:37:07 +1000 | [diff] [blame] | 1587 | struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) |
| 1588 | { |
| 1589 | struct pci_controller *hose = bus->sysdata; |
| 1590 | |
| 1591 | return of_node_get(hose->dn); |
| 1592 | } |
| 1593 | |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1594 | /** |
| 1595 | * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus |
| 1596 | * @hose: Pointer to the PCI host controller instance structure |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1597 | */ |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 1598 | void pcibios_scan_phb(struct pci_controller *hose) |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1599 | { |
Bjorn Helgaas | 45a709f | 2011-10-28 16:27:43 -0600 | [diff] [blame] | 1600 | LIST_HEAD(resources); |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1601 | struct pci_bus *bus; |
| 1602 | struct device_node *node = hose->dn; |
| 1603 | int mode; |
| 1604 | |
Grant Likely | 74a7f08 | 2012-06-15 11:50:25 -0600 | [diff] [blame] | 1605 | pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node)); |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1606 | |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1607 | /* Get some IO space for the new PHB */ |
| 1608 | pcibios_setup_phb_io_space(hose); |
| 1609 | |
| 1610 | /* Wire up PHB bus resources */ |
Bjorn Helgaas | 45a709f | 2011-10-28 16:27:43 -0600 | [diff] [blame] | 1611 | pcibios_setup_phb_resources(hose, &resources); |
| 1612 | |
Yinghai Lu | be8e60d | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1613 | hose->busn.start = hose->first_busno; |
| 1614 | hose->busn.end = hose->last_busno; |
| 1615 | hose->busn.flags = IORESOURCE_BUS; |
| 1616 | pci_add_resource(&resources, &hose->busn); |
| 1617 | |
Bjorn Helgaas | 45a709f | 2011-10-28 16:27:43 -0600 | [diff] [blame] | 1618 | /* Create an empty bus for the toplevel */ |
| 1619 | bus = pci_create_root_bus(hose->parent, hose->first_busno, |
| 1620 | hose->ops, hose, &resources); |
| 1621 | if (bus == NULL) { |
| 1622 | pr_err("Failed to create bus for PCI domain %04x\n", |
| 1623 | hose->global_number); |
| 1624 | pci_free_resource_list(&resources); |
| 1625 | return; |
| 1626 | } |
Bjorn Helgaas | 45a709f | 2011-10-28 16:27:43 -0600 | [diff] [blame] | 1627 | hose->bus = bus; |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1628 | |
| 1629 | /* Get probe mode and perform scan */ |
| 1630 | mode = PCI_PROBE_NORMAL; |
| 1631 | if (node && ppc_md.pci_probe_mode) |
| 1632 | mode = ppc_md.pci_probe_mode(bus); |
| 1633 | pr_debug(" probe mode: %d\n", mode); |
Yinghai Lu | be8e60d | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1634 | if (mode == PCI_PROBE_DEVTREE) |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1635 | of_scan_bus(node, bus); |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1636 | |
Yinghai Lu | be8e60d | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1637 | if (mode == PCI_PROBE_NORMAL) { |
| 1638 | pci_bus_update_busn_res_end(bus, 255); |
| 1639 | hose->last_busno = pci_scan_child_bus(bus); |
| 1640 | pci_bus_update_busn_res_end(bus, hose->last_busno); |
| 1641 | } |
Benjamin Herrenschmidt | 781fb7a | 2011-09-19 17:44:50 +0000 | [diff] [blame] | 1642 | |
Benjamin Herrenschmidt | 491b98c | 2011-11-06 18:55:57 +0000 | [diff] [blame] | 1643 | /* Platform gets a chance to do some global fixups before |
| 1644 | * we proceed to resource allocation |
| 1645 | */ |
| 1646 | if (ppc_md.pcibios_fixup_phb) |
| 1647 | ppc_md.pcibios_fixup_phb(hose); |
| 1648 | |
Benjamin Herrenschmidt | 781fb7a | 2011-09-19 17:44:50 +0000 | [diff] [blame] | 1649 | /* Configure PCI Express settings */ |
Benjamin Herrenschmidt | bb36c44 | 2011-09-26 14:22:39 +1000 | [diff] [blame] | 1650 | if (bus && !pci_has_flag(PCI_PROBE_ONLY)) { |
Benjamin Herrenschmidt | 781fb7a | 2011-09-19 17:44:50 +0000 | [diff] [blame] | 1651 | struct pci_bus *child; |
Bjorn Helgaas | a58674f | 2013-08-22 11:24:44 +0800 | [diff] [blame] | 1652 | list_for_each_entry(child, &bus->children, node) |
| 1653 | pcie_bus_configure_settings(child); |
Benjamin Herrenschmidt | 781fb7a | 2011-09-19 17:44:50 +0000 | [diff] [blame] | 1654 | } |
Grant Likely | 0ed2c72 | 2009-08-28 08:58:16 +0000 | [diff] [blame] | 1655 | } |
Kumar Gala | c065488 | 2011-05-19 22:26:18 -0500 | [diff] [blame] | 1656 | |
| 1657 | static void fixup_hide_host_resource_fsl(struct pci_dev *dev) |
| 1658 | { |
| 1659 | int i, class = dev->class >> 8; |
Jason Jin | 05737c7 | 2011-10-28 16:08:00 +0800 | [diff] [blame] | 1660 | /* When configured as agent, programing interface = 1 */ |
| 1661 | int prog_if = dev->class & 0xf; |
Kumar Gala | c065488 | 2011-05-19 22:26:18 -0500 | [diff] [blame] | 1662 | |
| 1663 | if ((class == PCI_CLASS_PROCESSOR_POWERPC || |
| 1664 | class == PCI_CLASS_BRIDGE_OTHER) && |
| 1665 | (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) && |
Jason Jin | 05737c7 | 2011-10-28 16:08:00 +0800 | [diff] [blame] | 1666 | (prog_if == 0) && |
Kumar Gala | c065488 | 2011-05-19 22:26:18 -0500 | [diff] [blame] | 1667 | (dev->bus->parent == NULL)) { |
| 1668 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { |
| 1669 | dev->resource[i].start = 0; |
| 1670 | dev->resource[i].end = 0; |
| 1671 | dev->resource[i].flags = 0; |
| 1672 | } |
| 1673 | } |
| 1674 | } |
| 1675 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); |
| 1676 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); |
Brian King | c2e1d84 | 2013-04-08 03:05:10 +0000 | [diff] [blame] | 1677 | |
| 1678 | static void fixup_vga(struct pci_dev *pdev) |
| 1679 | { |
| 1680 | u16 cmd; |
| 1681 | |
| 1682 | pci_read_config_word(pdev, PCI_COMMAND, &cmd); |
| 1683 | if ((cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) || !vga_default_device()) |
| 1684 | vga_set_default_device(pdev); |
| 1685 | |
| 1686 | } |
| 1687 | DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID, |
| 1688 | PCI_CLASS_DISPLAY_VGA, 8, fixup_vga); |