1/* 2 * linux/arch/alpha/kernel/core_irongate.c 3 * 4 * Based on code written by David A. Rusling (david.rusling@reo.mts.dec.com). 5 * 6 * Copyright (C) 1999 Alpha Processor, Inc., 7 * (David Daniel, Stig Telfer, Soohoon Lee) 8 * 9 * Code common to all IRONGATE core logic chips. 10 */ 11 12#define __EXTERN_INLINE inline 13#include <asm/io.h> 14#include <asm/core_irongate.h> 15#undef __EXTERN_INLINE 16 17#include <linux/types.h> 18#include <linux/pci.h> 19#include <linux/sched.h> 20#include <linux/init.h> 21#include <linux/initrd.h> 22#include <linux/bootmem.h> 23 24#include <asm/ptrace.h> 25#include <asm/pci.h> 26#include <asm/cacheflush.h> 27#include <asm/tlbflush.h> 28 29#include "proto.h" 30#include "pci_impl.h" 31 32/* 33 * BIOS32-style PCI interface: 34 */ 35 36#define DEBUG_CONFIG 0 37 38#if DEBUG_CONFIG 39# define DBG_CFG(args) printk args 40#else 41# define DBG_CFG(args) 42#endif 43 44igcsr32 *IronECC; 45 46/* 47 * Given a bus, device, and function number, compute resulting 48 * configuration space address accordingly. It is therefore not safe 49 * to have concurrent invocations to configuration space access 50 * routines, but there really shouldn't be any need for this. 51 * 52 * addr[31:24] reserved 53 * addr[23:16] bus number (8 bits = 128 possible buses) 54 * addr[15:11] Device number (5 bits) 55 * addr[10: 8] function number 56 * addr[ 7: 2] register number 57 * 58 * For IRONGATE: 59 * if (bus = addr[23:16]) == 0 60 * then 61 * type 0 config cycle: 62 * addr_on_pci[31:11] = id selection for device = addr[15:11] 63 * addr_on_pci[10: 2] = addr[10: 2] ??? 64 * addr_on_pci[ 1: 0] = 00 65 * else 66 * type 1 config cycle (pass on with no decoding): 67 * addr_on_pci[31:24] = 0 68 * addr_on_pci[23: 2] = addr[23: 2] 69 * addr_on_pci[ 1: 0] = 01 70 * fi 71 * 72 * Notes: 73 * The function number selects which function of a multi-function device 74 * (e.g., SCSI and Ethernet). 75 * 76 * The register selects a DWORD (32 bit) register offset. Hence it 77 * doesn't get shifted by 2 bits as we want to "drop" the bottom two 78 * bits. 79 */ 80 81static int 82mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where, 83 unsigned long *pci_addr, unsigned char *type1) 84{ 85 unsigned long addr; 86 u8 bus = pbus->number; 87 88 DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, " 89 "pci_addr=0x%p, type1=0x%p)\n", 90 bus, device_fn, where, pci_addr, type1)); 91 92 *type1 = (bus != 0); 93 94 addr = (bus << 16) | (device_fn << 8) | where; 95 addr |= IRONGATE_CONF; 96 97 *pci_addr = addr; 98 DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr)); 99 return 0; 100} 101 102static int 103irongate_read_config(struct pci_bus *bus, unsigned int devfn, int where, 104 int size, u32 *value) 105{ 106 unsigned long addr; 107 unsigned char type1; 108 109 if (mk_conf_addr(bus, devfn, where, &addr, &type1)) 110 return PCIBIOS_DEVICE_NOT_FOUND; 111 112 switch (size) { 113 case 1: 114 *value = __kernel_ldbu(*(vucp)addr); 115 break; 116 case 2: 117 *value = __kernel_ldwu(*(vusp)addr); 118 break; 119 case 4: 120 *value = *(vuip)addr; 121 break; 122 } 123 124 return PCIBIOS_SUCCESSFUL; 125} 126 127static int 128irongate_write_config(struct pci_bus *bus, unsigned int devfn, int where, 129 int size, u32 value) 130{ 131 unsigned long addr; 132 unsigned char type1; 133 134 if (mk_conf_addr(bus, devfn, where, &addr, &type1)) 135 return PCIBIOS_DEVICE_NOT_FOUND; 136 137 switch (size) { 138 case 1: 139 __kernel_stb(value, *(vucp)addr); 140 mb(); 141 __kernel_ldbu(*(vucp)addr); 142 break; 143 case 2: 144 __kernel_stw(value, *(vusp)addr); 145 mb(); 146 __kernel_ldwu(*(vusp)addr); 147 break; 148 case 4: 149 *(vuip)addr = value; 150 mb(); 151 *(vuip)addr; 152 break; 153 } 154 155 return PCIBIOS_SUCCESSFUL; 156} 157 158struct pci_ops irongate_pci_ops = 159{ 160 .read = irongate_read_config, 161 .write = irongate_write_config, 162}; 163 164int 165irongate_pci_clr_err(void) 166{ 167 unsigned int nmi_ctl=0; 168 unsigned int IRONGATE_jd; 169 170again: 171 IRONGATE_jd = IRONGATE0->stat_cmd; 172 printk("Iron stat_cmd %x\n", IRONGATE_jd); 173 IRONGATE0->stat_cmd = IRONGATE_jd; /* write again clears error bits */ 174 mb(); 175 IRONGATE_jd = IRONGATE0->stat_cmd; /* re-read to force write */ 176 177 IRONGATE_jd = *IronECC; 178 printk("Iron ECC %x\n", IRONGATE_jd); 179 *IronECC = IRONGATE_jd; /* write again clears error bits */ 180 mb(); 181 IRONGATE_jd = *IronECC; /* re-read to force write */ 182 183 /* Clear ALI NMI */ 184 nmi_ctl = inb(0x61); 185 nmi_ctl |= 0x0c; 186 outb(nmi_ctl, 0x61); 187 nmi_ctl &= ~0x0c; 188 outb(nmi_ctl, 0x61); 189 190 IRONGATE_jd = *IronECC; 191 if (IRONGATE_jd & 0x300) goto again; 192 193 return 0; 194} 195 196#define IRONGATE_3GB 0xc0000000UL 197 198/* On Albacore (aka UP1500) with 4Gb of RAM we have to reserve some 199 memory for PCI. At this point we just reserve memory above 3Gb. Most 200 of this memory will be freed after PCI setup is done. */ 201static void __init 202albacore_init_arch(void) 203{ 204 unsigned long memtop = max_low_pfn << PAGE_SHIFT; 205 unsigned long pci_mem = (memtop + 0x1000000UL) & ~0xffffffUL; 206 struct percpu_struct *cpu; 207 int pal_rev, pal_var; 208 209 cpu = (struct percpu_struct*)((char*)hwrpb + hwrpb->processor_offset); 210 pal_rev = cpu->pal_revision & 0xffff; 211 pal_var = (cpu->pal_revision >> 16) & 0xff; 212 213 /* Consoles earlier than A5.6-18 (OSF PALcode v1.62-2) set up 214 the CPU incorrectly (leave speculative stores enabled), 215 which causes memory corruption under certain conditions. 216 Issue a warning for such consoles. */ 217 if (alpha_using_srm && 218 (pal_rev < 0x13e || (pal_rev == 0x13e && pal_var < 2))) 219 printk(KERN_WARNING "WARNING! Upgrade to SRM A5.6-19 " 220 "or later\n"); 221 222 if (pci_mem > IRONGATE_3GB) 223 pci_mem = IRONGATE_3GB; 224 IRONGATE0->pci_mem = pci_mem; 225 alpha_mv.min_mem_address = pci_mem; 226 if (memtop > pci_mem) { 227#ifdef CONFIG_BLK_DEV_INITRD 228 extern unsigned long initrd_start, initrd_end; 229 extern void *move_initrd(unsigned long); 230 231 /* Move the initrd out of the way. */ 232 if (initrd_end && __pa(initrd_end) > pci_mem) { 233 unsigned long size; 234 235 size = initrd_end - initrd_start; 236 free_bootmem_node(NODE_DATA(0), __pa(initrd_start), 237 PAGE_ALIGN(size)); 238 if (!move_initrd(pci_mem)) 239 printk("irongate_init_arch: initrd too big " 240 "(%ldK)\ndisabling initrd\n", 241 size / 1024); 242 } 243#endif 244 reserve_bootmem_node(NODE_DATA(0), pci_mem, memtop - 245 pci_mem, BOOTMEM_DEFAULT); 246 printk("irongate_init_arch: temporarily reserving " 247 "region %08lx-%08lx for PCI\n", pci_mem, memtop - 1); 248 } 249} 250 251static void __init 252irongate_setup_agp(void) 253{ 254 /* Disable the GART window. AGPGART doesn't work due to yet 255 unresolved memory coherency issues... */ 256 IRONGATE0->agpva = IRONGATE0->agpva & ~0xf; 257 alpha_agpgart_size = 0; 258} 259 260void __init 261irongate_init_arch(void) 262{ 263 struct pci_controller *hose; 264 int amd761 = (IRONGATE0->dev_vendor >> 16) > 0x7006; /* Albacore? */ 265 266 IronECC = amd761 ? &IRONGATE0->bacsr54_eccms761 : &IRONGATE0->dramms; 267 268 irongate_pci_clr_err(); 269 270 if (amd761) 271 albacore_init_arch(); 272 273 irongate_setup_agp(); 274 275 /* 276 * Create our single hose. 277 */ 278 279 pci_isa_hose = hose = alloc_pci_controller(); 280 hose->io_space = &ioport_resource; 281 hose->mem_space = &iomem_resource; 282 hose->index = 0; 283 284 /* This is for userland consumption. For some reason, the 40-bit 285 PIO bias that we use in the kernel through KSEG didn't work for 286 the page table based user mappings. So make sure we get the 287 43-bit PIO bias. */ 288 hose->sparse_mem_base = 0; 289 hose->sparse_io_base = 0; 290 hose->dense_mem_base 291 = (IRONGATE_MEM & 0xffffffffffUL) | 0x80000000000UL; 292 hose->dense_io_base 293 = (IRONGATE_IO & 0xffffffffffUL) | 0x80000000000UL; 294 295 hose->sg_isa = hose->sg_pci = NULL; 296 __direct_map_base = 0; 297 __direct_map_size = 0xffffffff; 298} 299 300/* 301 * IO map and AGP support 302 */ 303#include <linux/vmalloc.h> 304#include <linux/agp_backend.h> 305#include <linux/agpgart.h> 306#include <asm/pgalloc.h> 307 308#define GET_PAGE_DIR_OFF(addr) (addr >> 22) 309#define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr)) 310 311#define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12) 312#define GET_GATT(addr) (gatt_pages[GET_PAGE_DIR_IDX(addr)]) 313 314void __iomem * 315irongate_ioremap(unsigned long addr, unsigned long size) 316{ 317 struct vm_struct *area; 318 unsigned long vaddr; 319 unsigned long baddr, last; 320 u32 *mmio_regs, *gatt_pages, *cur_gatt, pte; 321 unsigned long gart_bus_addr; 322 323 if (!alpha_agpgart_size) 324 return (void __iomem *)(addr + IRONGATE_MEM); 325 326 gart_bus_addr = (unsigned long)IRONGATE0->bar0 & 327 PCI_BASE_ADDRESS_MEM_MASK; 328 329 /* 330 * Check for within the AGP aperture... 331 */ 332 do { 333 /* 334 * Check the AGP area 335 */ 336 if (addr >= gart_bus_addr && addr + size - 1 < 337 gart_bus_addr + alpha_agpgart_size) 338 break; 339 340 /* 341 * Not found - assume legacy ioremap 342 */ 343 return (void __iomem *)(addr + IRONGATE_MEM); 344 } while(0); 345 346 mmio_regs = (u32 *)(((unsigned long)IRONGATE0->bar1 & 347 PCI_BASE_ADDRESS_MEM_MASK) + IRONGATE_MEM); 348 349 gatt_pages = (u32 *)(phys_to_virt(mmio_regs[1])); 350 351 /* 352 * Adjust the limits (mappings must be page aligned) 353 */ 354 if (addr & ~PAGE_MASK) { 355 printk("AGP ioremap failed... addr not page aligned (0x%lx)\n", 356 addr); 357 return (void __iomem *)(addr + IRONGATE_MEM); 358 } 359 last = addr + size - 1; 360 size = PAGE_ALIGN(last) - addr; 361 362 363 /* 364 * Map it 365 */ 366 area = get_vm_area(size, VM_IOREMAP); 367 if (!area) return NULL; 368 369 for(baddr = addr, vaddr = (unsigned long)area->addr; 370 baddr <= last; 371 baddr += PAGE_SIZE, vaddr += PAGE_SIZE) 372 { 373 cur_gatt = phys_to_virt(GET_GATT(baddr) & ~1); 374 pte = cur_gatt[GET_GATT_OFF(baddr)] & ~1; 375 376 if (__alpha_remap_area_pages(vaddr, 377 pte, PAGE_SIZE, 0)) { 378 printk("AGP ioremap: FAILED to map...\n"); 379 vfree(area->addr); 380 return NULL; 381 } 382 } 383 384 flush_tlb_all(); 385 386 vaddr = (unsigned long)area->addr + (addr & ~PAGE_MASK); 387 return (void __iomem *)vaddr; 388} 389EXPORT_SYMBOL(irongate_ioremap); 390 391void 392irongate_iounmap(volatile void __iomem *xaddr) 393{ 394 unsigned long addr = (unsigned long) xaddr; 395 if (((long)addr >> 41) == -2) 396 return; /* kseg map, nothing to do */ 397 if (addr) 398 return vfree((void *)(PAGE_MASK & addr)); 399} 400EXPORT_SYMBOL(irongate_iounmap); 401