1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/arch/alpha/kernel/core_irongate.c 4 * 5 * Based on code written by David A. Rusling (david.rusling@reo.mts.dec.com). 6 * 7 * Copyright (C) 1999 Alpha Processor, Inc., 8 * (David Daniel, Stig Telfer, Soohoon Lee) 9 * 10 * Code common to all IRONGATE core logic chips. 11 */ 12 13#define __EXTERN_INLINE inline 14#include <asm/io.h> 15#include <asm/core_irongate.h> 16#undef __EXTERN_INLINE 17 18#include <linux/types.h> 19#include <linux/pci.h> 20#include <linux/sched.h> 21#include <linux/init.h> 22#include <linux/initrd.h> 23#include <linux/memblock.h> 24 25#include <asm/ptrace.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 memblock_free((void *)initrd_start, PAGE_ALIGN(size)); 237 if (!move_initrd(pci_mem)) 238 printk("irongate_init_arch: initrd too big " 239 "(%ldK)\ndisabling initrd\n", 240 size / 1024); 241 } 242#endif 243 memblock_reserve(pci_mem, memtop - pci_mem); 244 printk("irongate_init_arch: temporarily reserving " 245 "region %08lx-%08lx for PCI\n", pci_mem, memtop - 1); 246 } 247} 248 249static void __init 250irongate_setup_agp(void) 251{ 252 /* Disable the GART window. AGPGART doesn't work due to yet 253 unresolved memory coherency issues... */ 254 IRONGATE0->agpva = IRONGATE0->agpva & ~0xf; 255 alpha_agpgart_size = 0; 256} 257 258void __init 259irongate_init_arch(void) 260{ 261 struct pci_controller *hose; 262 int amd761 = (IRONGATE0->dev_vendor >> 16) > 0x7006; /* Albacore? */ 263 264 IronECC = amd761 ? &IRONGATE0->bacsr54_eccms761 : &IRONGATE0->dramms; 265 266 irongate_pci_clr_err(); 267 268 if (amd761) 269 albacore_init_arch(); 270 271 irongate_setup_agp(); 272 273 /* 274 * Create our single hose. 275 */ 276 277 pci_isa_hose = hose = alloc_pci_controller(); 278 hose->io_space = &ioport_resource; 279 hose->mem_space = &iomem_resource; 280 hose->index = 0; 281 282 /* This is for userland consumption. For some reason, the 40-bit 283 PIO bias that we use in the kernel through KSEG didn't work for 284 the page table based user mappings. So make sure we get the 285 43-bit PIO bias. */ 286 hose->sparse_mem_base = 0; 287 hose->sparse_io_base = 0; 288 hose->dense_mem_base 289 = (IRONGATE_MEM & 0xffffffffffUL) | 0x80000000000UL; 290 hose->dense_io_base 291 = (IRONGATE_IO & 0xffffffffffUL) | 0x80000000000UL; 292 293 hose->sg_isa = hose->sg_pci = NULL; 294 __direct_map_base = 0; 295 __direct_map_size = 0xffffffff; 296} 297 298/* 299 * IO map and AGP support 300 */ 301#include <linux/vmalloc.h> 302#include <linux/agp_backend.h> 303#include <linux/agpgart.h> 304#include <linux/export.h> 305 306#define GET_PAGE_DIR_OFF(addr) (addr >> 22) 307#define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr)) 308 309#define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12) 310#define GET_GATT(addr) (gatt_pages[GET_PAGE_DIR_IDX(addr)]) 311 312void __iomem * 313irongate_ioremap(unsigned long addr, unsigned long size) 314{ 315 struct vm_struct *area; 316 unsigned long vaddr; 317 unsigned long baddr, last; 318 u32 *mmio_regs, *gatt_pages, *cur_gatt, pte; 319 unsigned long gart_bus_addr; 320 321 if (!alpha_agpgart_size) 322 return (void __iomem *)(addr + IRONGATE_MEM); 323 324 gart_bus_addr = (unsigned long)IRONGATE0->bar0 & 325 PCI_BASE_ADDRESS_MEM_MASK; 326 327 /* 328 * Check for within the AGP aperture... 329 */ 330 do { 331 /* 332 * Check the AGP area 333 */ 334 if (addr >= gart_bus_addr && addr + size - 1 < 335 gart_bus_addr + alpha_agpgart_size) 336 break; 337 338 /* 339 * Not found - assume legacy ioremap 340 */ 341 return (void __iomem *)(addr + IRONGATE_MEM); 342 } while(0); 343 344 mmio_regs = (u32 *)(((unsigned long)IRONGATE0->bar1 & 345 PCI_BASE_ADDRESS_MEM_MASK) + IRONGATE_MEM); 346 347 gatt_pages = (u32 *)(phys_to_virt(mmio_regs[1])); /* FIXME */ 348 349 /* 350 * Adjust the limits (mappings must be page aligned) 351 */ 352 if (addr & ~PAGE_MASK) { 353 printk("AGP ioremap failed... addr not page aligned (0x%lx)\n", 354 addr); 355 return (void __iomem *)(addr + IRONGATE_MEM); 356 } 357 last = addr + size - 1; 358 size = PAGE_ALIGN(last) - addr; 359 360#if 0 361 printk("irongate_ioremap(0x%lx, 0x%lx)\n", addr, size); 362 printk("irongate_ioremap: gart_bus_addr 0x%lx\n", gart_bus_addr); 363 printk("irongate_ioremap: gart_aper_size 0x%lx\n", gart_aper_size); 364 printk("irongate_ioremap: mmio_regs %p\n", mmio_regs); 365 printk("irongate_ioremap: gatt_pages %p\n", gatt_pages); 366 367 for(baddr = addr; baddr <= last; baddr += PAGE_SIZE) 368 { 369 cur_gatt = phys_to_virt(GET_GATT(baddr) & ~1); 370 pte = cur_gatt[GET_GATT_OFF(baddr)] & ~1; 371 printk("irongate_ioremap: cur_gatt %p pte 0x%x\n", 372 cur_gatt, pte); 373 } 374#endif 375 376 /* 377 * Map it 378 */ 379 area = get_vm_area(size, VM_IOREMAP); 380 if (!area) return NULL; 381 382 for(baddr = addr, vaddr = (unsigned long)area->addr; 383 baddr <= last; 384 baddr += PAGE_SIZE, vaddr += PAGE_SIZE) 385 { 386 cur_gatt = phys_to_virt(GET_GATT(baddr) & ~1); 387 pte = cur_gatt[GET_GATT_OFF(baddr)] & ~1; 388 389 if (__alpha_remap_area_pages(vaddr, 390 pte, PAGE_SIZE, 0)) { 391 printk("AGP ioremap: FAILED to map...\n"); 392 vfree(area->addr); 393 return NULL; 394 } 395 } 396 397 flush_tlb_all(); 398 399 vaddr = (unsigned long)area->addr + (addr & ~PAGE_MASK); 400#if 0 401 printk("irongate_ioremap(0x%lx, 0x%lx) returning 0x%lx\n", 402 addr, size, vaddr); 403#endif 404 return (void __iomem *)vaddr; 405} 406EXPORT_SYMBOL(irongate_ioremap); 407 408void 409irongate_iounmap(volatile void __iomem *xaddr) 410{ 411 unsigned long addr = (unsigned long) xaddr; 412 if (((long)addr >> 41) == -2) 413 return; /* kseg map, nothing to do */ 414 if (addr) 415 return vfree((void *)(PAGE_MASK & addr)); 416} 417EXPORT_SYMBOL(irongate_iounmap); 418