Catalin Marinas | c0da085 | 2005-06-20 18:51:06 +0100 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-versatile/pci.c |
| 3 | * |
| 4 | * (C) Copyright Koninklijke Philips Electronics NV 2004. All rights reserved. |
| 5 | * You can redistribute and/or modify this software under the terms of version 2 |
| 6 | * of the GNU General Public License as published by the Free Software Foundation. |
| 7 | * THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED |
| 8 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 9 | * General Public License for more details. |
| 10 | * Koninklijke Philips Electronics nor its subsidiaries is obligated to provide any support for this software. |
| 11 | * |
| 12 | * ARM Versatile PCI driver. |
| 13 | * |
| 14 | * 14/04/2005 Initial version, colin.king@philips.com |
| 15 | * |
| 16 | */ |
| 17 | #include <linux/config.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/pci.h> |
| 20 | #include <linux/ptrace.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/ioport.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/spinlock.h> |
| 25 | #include <linux/init.h> |
| 26 | |
| 27 | #include <asm/hardware.h> |
| 28 | #include <asm/io.h> |
| 29 | #include <asm/irq.h> |
| 30 | #include <asm/system.h> |
| 31 | #include <asm/mach/pci.h> |
Catalin Marinas | c0da085 | 2005-06-20 18:51:06 +0100 | [diff] [blame] | 32 | |
| 33 | /* |
| 34 | * these spaces are mapped using the following base registers: |
| 35 | * |
| 36 | * Usage Local Bus Memory Base/Map registers used |
| 37 | * |
| 38 | * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0, non prefetch |
| 39 | * Mem 60000000 - 6FFFFFFF LB_BASE1/LB_MAP1, prefetch |
| 40 | * IO 44000000 - 4FFFFFFF LB_BASE2/LB_MAP2, IO |
| 41 | * Cfg 42000000 - 42FFFFFF PCI config |
| 42 | * |
| 43 | */ |
| 44 | #define SYS_PCICTL IO_ADDRESS(VERSATILE_SYS_PCICTL) |
| 45 | #define PCI_IMAP0 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x0) |
| 46 | #define PCI_IMAP1 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x4) |
| 47 | #define PCI_IMAP2 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x8) |
| 48 | #define PCI_SMAP0 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x10) |
| 49 | #define PCI_SMAP1 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14) |
| 50 | #define PCI_SMAP2 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18) |
| 51 | #define PCI_SELFID IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0xc) |
| 52 | |
| 53 | #define DEVICE_ID_OFFSET 0x00 |
| 54 | #define CSR_OFFSET 0x04 |
| 55 | #define CLASS_ID_OFFSET 0x08 |
| 56 | |
| 57 | #define VP_PCI_DEVICE_ID 0x030010ee |
| 58 | #define VP_PCI_CLASS_ID 0x0b400000 |
| 59 | |
| 60 | static unsigned long pci_slot_ignore = 0; |
| 61 | |
| 62 | static int __init versatile_pci_slot_ignore(char *str) |
| 63 | { |
| 64 | int retval; |
| 65 | int slot; |
| 66 | |
| 67 | while ((retval = get_option(&str,&slot))) { |
| 68 | if ((slot < 0) || (slot > 31)) { |
| 69 | printk("Illegal slot value: %d\n",slot); |
| 70 | } else { |
| 71 | pci_slot_ignore |= (1 << slot); |
| 72 | } |
| 73 | } |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | __setup("pci_slot_ignore=", versatile_pci_slot_ignore); |
| 78 | |
| 79 | |
| 80 | static unsigned long __pci_addr(struct pci_bus *bus, |
| 81 | unsigned int devfn, int offset) |
| 82 | { |
| 83 | unsigned int busnr = bus->number; |
| 84 | |
| 85 | /* |
| 86 | * Trap out illegal values |
| 87 | */ |
| 88 | if (offset > 255) |
| 89 | BUG(); |
| 90 | if (busnr > 255) |
| 91 | BUG(); |
| 92 | if (devfn > 255) |
| 93 | BUG(); |
| 94 | |
| 95 | return (VERSATILE_PCI_CFG_VIRT_BASE | (busnr << 16) | |
| 96 | (PCI_SLOT(devfn) << 11) | (PCI_FUNC(devfn) << 8) | offset); |
| 97 | } |
| 98 | |
| 99 | static int versatile_read_config(struct pci_bus *bus, unsigned int devfn, int where, |
| 100 | int size, u32 *val) |
| 101 | { |
| 102 | unsigned long addr = __pci_addr(bus, devfn, where); |
| 103 | u32 v; |
| 104 | int slot = PCI_SLOT(devfn); |
| 105 | |
| 106 | if (pci_slot_ignore & (1 << slot)) { |
| 107 | /* Ignore this slot */ |
| 108 | switch (size) { |
| 109 | case 1: |
| 110 | v = 0xff; |
| 111 | break; |
| 112 | case 2: |
| 113 | v = 0xffff; |
| 114 | break; |
| 115 | default: |
| 116 | v = 0xffffffff; |
| 117 | } |
| 118 | } else { |
| 119 | switch (size) { |
| 120 | case 1: |
| 121 | addr &= ~3; |
| 122 | v = __raw_readb(addr); |
| 123 | break; |
| 124 | |
| 125 | case 2: |
| 126 | v = __raw_readl(addr & ~3); |
| 127 | if (addr & 2) v >>= 16; |
| 128 | v &= 0xffff; |
| 129 | break; |
| 130 | |
| 131 | default: |
| 132 | addr &= ~3; |
| 133 | v = __raw_readl(addr); |
| 134 | break; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | *val = v; |
| 139 | return PCIBIOS_SUCCESSFUL; |
| 140 | } |
| 141 | |
| 142 | static int versatile_write_config(struct pci_bus *bus, unsigned int devfn, int where, |
| 143 | int size, u32 val) |
| 144 | { |
| 145 | unsigned long addr = __pci_addr(bus, devfn, where); |
| 146 | int slot = PCI_SLOT(devfn); |
| 147 | |
| 148 | if (pci_slot_ignore & (1 << slot)) { |
| 149 | return PCIBIOS_SUCCESSFUL; |
| 150 | } |
| 151 | |
| 152 | switch (size) { |
| 153 | case 1: |
| 154 | __raw_writeb((u8)val, addr); |
| 155 | break; |
| 156 | |
| 157 | case 2: |
| 158 | __raw_writew((u16)val, addr); |
| 159 | break; |
| 160 | |
| 161 | case 4: |
| 162 | __raw_writel(val, addr); |
| 163 | break; |
| 164 | } |
| 165 | |
| 166 | return PCIBIOS_SUCCESSFUL; |
| 167 | } |
| 168 | |
| 169 | static struct pci_ops pci_versatile_ops = { |
| 170 | .read = versatile_read_config, |
| 171 | .write = versatile_write_config, |
| 172 | }; |
| 173 | |
| 174 | static struct resource io_mem = { |
| 175 | .name = "PCI I/O space", |
| 176 | .start = VERSATILE_PCI_MEM_BASE0, |
| 177 | .end = VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1, |
| 178 | .flags = IORESOURCE_IO, |
| 179 | }; |
| 180 | |
| 181 | static struct resource non_mem = { |
| 182 | .name = "PCI non-prefetchable", |
| 183 | .start = VERSATILE_PCI_MEM_BASE1, |
| 184 | .end = VERSATILE_PCI_MEM_BASE1+VERSATILE_PCI_MEM_BASE1_SIZE-1, |
| 185 | .flags = IORESOURCE_MEM, |
| 186 | }; |
| 187 | |
| 188 | static struct resource pre_mem = { |
| 189 | .name = "PCI prefetchable", |
| 190 | .start = VERSATILE_PCI_MEM_BASE2, |
| 191 | .end = VERSATILE_PCI_MEM_BASE2+VERSATILE_PCI_MEM_BASE2_SIZE-1, |
| 192 | .flags = IORESOURCE_MEM | IORESOURCE_PREFETCH, |
| 193 | }; |
| 194 | |
| 195 | static int __init pci_versatile_setup_resources(struct resource **resource) |
| 196 | { |
| 197 | int ret = 0; |
| 198 | |
| 199 | ret = request_resource(&iomem_resource, &io_mem); |
| 200 | if (ret) { |
| 201 | printk(KERN_ERR "PCI: unable to allocate I/O " |
| 202 | "memory region (%d)\n", ret); |
| 203 | goto out; |
| 204 | } |
| 205 | ret = request_resource(&iomem_resource, &non_mem); |
| 206 | if (ret) { |
| 207 | printk(KERN_ERR "PCI: unable to allocate non-prefetchable " |
| 208 | "memory region (%d)\n", ret); |
| 209 | goto release_io_mem; |
| 210 | } |
| 211 | ret = request_resource(&iomem_resource, &pre_mem); |
| 212 | if (ret) { |
| 213 | printk(KERN_ERR "PCI: unable to allocate prefetchable " |
| 214 | "memory region (%d)\n", ret); |
| 215 | goto release_non_mem; |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * bus->resource[0] is the IO resource for this bus |
| 220 | * bus->resource[1] is the mem resource for this bus |
| 221 | * bus->resource[2] is the prefetch mem resource for this bus |
| 222 | */ |
| 223 | resource[0] = &io_mem; |
| 224 | resource[1] = &non_mem; |
| 225 | resource[2] = &pre_mem; |
| 226 | |
| 227 | goto out; |
| 228 | |
| 229 | release_non_mem: |
| 230 | release_resource(&non_mem); |
| 231 | release_io_mem: |
| 232 | release_resource(&io_mem); |
| 233 | out: |
| 234 | return ret; |
| 235 | } |
| 236 | |
| 237 | int __init pci_versatile_setup(int nr, struct pci_sys_data *sys) |
| 238 | { |
| 239 | int ret = 0; |
| 240 | int i; |
| 241 | int myslot = -1; |
| 242 | unsigned long val; |
| 243 | |
| 244 | if (nr == 0) { |
| 245 | sys->mem_offset = 0; |
| 246 | ret = pci_versatile_setup_resources(sys->resource); |
| 247 | if (ret < 0) { |
| 248 | printk("pci_versatile_setup: resources... oops?\n"); |
| 249 | goto out; |
| 250 | } |
| 251 | } else { |
| 252 | printk("pci_versatile_setup: resources... nr == 0??\n"); |
| 253 | goto out; |
| 254 | } |
| 255 | |
| 256 | __raw_writel(VERSATILE_PCI_MEM_BASE0 >> 28,PCI_IMAP0); |
| 257 | __raw_writel(VERSATILE_PCI_MEM_BASE1 >> 28,PCI_IMAP1); |
| 258 | __raw_writel(VERSATILE_PCI_MEM_BASE2 >> 28,PCI_IMAP2); |
| 259 | |
| 260 | __raw_writel(1, SYS_PCICTL); |
| 261 | |
| 262 | val = __raw_readl(SYS_PCICTL); |
| 263 | if (!(val & 1)) { |
| 264 | printk("Not plugged into PCI backplane!\n"); |
| 265 | ret = -EIO; |
| 266 | goto out; |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * We need to discover the PCI core first to configure itself |
| 271 | * before the main PCI probing is performed |
| 272 | */ |
| 273 | for (i=0; i<32; i++) { |
| 274 | if ((__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+DEVICE_ID_OFFSET) == VP_PCI_DEVICE_ID) && |
| 275 | (__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+CLASS_ID_OFFSET) == VP_PCI_CLASS_ID)) { |
| 276 | myslot = i; |
| 277 | |
| 278 | __raw_writel(myslot, PCI_SELFID); |
| 279 | val = __raw_readl(VERSATILE_PCI_CFG_VIRT_BASE+(myslot<<11)+CSR_OFFSET); |
| 280 | val |= (1<<2); |
| 281 | __raw_writel(val, VERSATILE_PCI_CFG_VIRT_BASE+(myslot<<11)+CSR_OFFSET); |
| 282 | break; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | if (myslot == -1) { |
| 287 | printk("Cannot find PCI core!\n"); |
| 288 | ret = -EIO; |
| 289 | } else { |
| 290 | printk("PCI core found (slot %d)\n",myslot); |
| 291 | /* Do not to map Versatile FPGA PCI device |
| 292 | into memory space as we are short of |
| 293 | mappable memory */ |
| 294 | pci_slot_ignore |= (1 << myslot); |
| 295 | ret = 1; |
| 296 | } |
| 297 | |
| 298 | out: |
| 299 | return ret; |
| 300 | } |
| 301 | |
| 302 | |
| 303 | struct pci_bus *pci_versatile_scan_bus(int nr, struct pci_sys_data *sys) |
| 304 | { |
| 305 | return pci_scan_bus(sys->busnr, &pci_versatile_ops, sys); |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * V3_LB_BASE? - local bus address |
| 310 | * V3_LB_MAP? - pci bus address |
| 311 | */ |
| 312 | void __init pci_versatile_preinit(void) |
| 313 | { |
| 314 | } |
| 315 | |
| 316 | void __init pci_versatile_postinit(void) |
| 317 | { |
| 318 | } |
| 319 | |
| 320 | |
| 321 | /* |
| 322 | * map the specified device/slot/pin to an IRQ. Different backplanes may need to modify this. |
| 323 | */ |
| 324 | static int __init versatile_map_irq(struct pci_dev *dev, u8 slot, u8 pin) |
| 325 | { |
| 326 | int irq; |
| 327 | int devslot = PCI_SLOT(dev->devfn); |
| 328 | |
| 329 | /* slot, pin, irq |
| 330 | 24 1 27 |
| 331 | 25 1 28 untested |
| 332 | 26 1 29 |
| 333 | 27 1 30 untested |
| 334 | */ |
| 335 | |
| 336 | irq = 27 + ((slot + pin + 2) % 3); /* Fudged */ |
| 337 | |
| 338 | printk("map irq: slot %d, pin %d, devslot %d, irq: %d\n",slot,pin,devslot,irq); |
| 339 | |
| 340 | return irq; |
| 341 | } |
| 342 | |
| 343 | static struct hw_pci versatile_pci __initdata = { |
| 344 | .swizzle = NULL, |
| 345 | .map_irq = versatile_map_irq, |
| 346 | .nr_controllers = 1, |
| 347 | .setup = pci_versatile_setup, |
| 348 | .scan = pci_versatile_scan_bus, |
| 349 | .preinit = pci_versatile_preinit, |
| 350 | .postinit = pci_versatile_postinit, |
| 351 | }; |
| 352 | |
| 353 | static int __init versatile_pci_init(void) |
| 354 | { |
| 355 | pci_common_init(&versatile_pci); |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | subsys_initcall(versatile_pci_init); |