1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/alpha/kernel/core_irongate.c
7 * Copyright (C) 1999 Alpha Processor, Inc.,
8 * (David Daniel, Stig Telfer, Soohoon Lee)
10 * Code common to all IRONGATE core logic chips.
13 #define __EXTERN_INLINE inline
15 #include <asm/core_irongate.h>
16 #undef __EXTERN_INLINE
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>
25 #include <asm/ptrace.h>
26 #include <asm/cacheflush.h>
27 #include <asm/tlbflush.h>
33 * BIOS32-style PCI interface:
36 #define DEBUG_CONFIG 0
39 # define DBG_CFG(args) printk args
41 # define DBG_CFG(args)
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.
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
59 * if (bus = addr[23:16]) == 0
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
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
73 * The function number selects which function of a multi-function device
74 * (e.g., SCSI and Ethernet).
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
82 mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
83 unsigned long *pci_addr, unsigned char *type1)
86 u8 bus = pbus->number;
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));
94 addr = (bus << 16) | (device_fn << 8) | where;
95 addr |= IRONGATE_CONF;
98 DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
103 irongate_read_config(struct pci_bus *bus, unsigned int devfn, int where,
104 int size, u32 *value)
109 if (mk_conf_addr(bus, devfn, where, &addr, &type1))
110 return PCIBIOS_DEVICE_NOT_FOUND;
114 *value = __kernel_ldbu(*(vucp)addr);
117 *value = __kernel_ldwu(*(vusp)addr);
120 *value = *(vuip)addr;
124 return PCIBIOS_SUCCESSFUL;
128 irongate_write_config(struct pci_bus *bus, unsigned int devfn, int where,
134 if (mk_conf_addr(bus, devfn, where, &addr, &type1))
135 return PCIBIOS_DEVICE_NOT_FOUND;
139 __kernel_stb(value, *(vucp)addr);
141 __kernel_ldbu(*(vucp)addr);
144 __kernel_stw(value, *(vusp)addr);
146 __kernel_ldwu(*(vusp)addr);
155 return PCIBIOS_SUCCESSFUL;
158 struct pci_ops irongate_pci_ops =
160 .read = irongate_read_config,
161 .write = irongate_write_config,
165 irongate_pci_clr_err(void)
167 unsigned int nmi_ctl=0;
168 unsigned int IRONGATE_jd;
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 */
175 IRONGATE_jd = IRONGATE0->stat_cmd; /* re-read to force write */
177 IRONGATE_jd = *IronECC;
178 printk("Iron ECC %x\n", IRONGATE_jd);
179 *IronECC = IRONGATE_jd; /* write again clears error bits */
181 IRONGATE_jd = *IronECC; /* re-read to force write */
190 IRONGATE_jd = *IronECC;
191 if (IRONGATE_jd & 0x300) goto again;
196 #define IRONGATE_3GB 0xc0000000UL
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. */
202 albacore_init_arch(void)
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;
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;
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 "
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);
231 /* Move the initrd out of the way. */
232 if (initrd_end && __pa(initrd_end) > pci_mem) {
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",
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);
250 irongate_setup_agp(void)
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;
259 irongate_init_arch(void)
261 struct pci_controller *hose;
262 int amd761 = (IRONGATE0->dev_vendor >> 16) > 0x7006; /* Albacore? */
264 IronECC = amd761 ? &IRONGATE0->bacsr54_eccms761 : &IRONGATE0->dramms;
266 irongate_pci_clr_err();
269 albacore_init_arch();
271 irongate_setup_agp();
274 * Create our single hose.
277 pci_isa_hose = hose = alloc_pci_controller();
278 hose->io_space = &ioport_resource;
279 hose->mem_space = &iomem_resource;
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
286 hose->sparse_mem_base = 0;
287 hose->sparse_io_base = 0;
289 = (IRONGATE_MEM & 0xffffffffffUL) | 0x80000000000UL;
291 = (IRONGATE_IO & 0xffffffffffUL) | 0x80000000000UL;
293 hose->sg_isa = hose->sg_pci = NULL;
294 __direct_map_base = 0;
295 __direct_map_size = 0xffffffff;
299 * IO map and AGP support
301 #include <linux/vmalloc.h>
302 #include <linux/agp_backend.h>
303 #include <linux/agpgart.h>
304 #include <linux/export.h>
306 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
307 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr))
309 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
310 #define GET_GATT(addr) (gatt_pages[GET_PAGE_DIR_IDX(addr)])
313 irongate_ioremap(unsigned long addr, unsigned long size)
315 struct vm_struct *area;
317 unsigned long baddr, last;
318 u32 *mmio_regs, *gatt_pages, *cur_gatt, pte;
319 unsigned long gart_bus_addr;
321 if (!alpha_agpgart_size)
322 return (void __iomem *)(addr + IRONGATE_MEM);
324 gart_bus_addr = (unsigned long)IRONGATE0->bar0 &
325 PCI_BASE_ADDRESS_MEM_MASK;
328 * Check for within the AGP aperture...
334 if (addr >= gart_bus_addr && addr + size - 1 <
335 gart_bus_addr + alpha_agpgart_size)
339 * Not found - assume legacy ioremap
341 return (void __iomem *)(addr + IRONGATE_MEM);
344 mmio_regs = (u32 *)(((unsigned long)IRONGATE0->bar1 &
345 PCI_BASE_ADDRESS_MEM_MASK) + IRONGATE_MEM);
347 gatt_pages = (u32 *)(phys_to_virt(mmio_regs[1])); /* FIXME */
350 * Adjust the limits (mappings must be page aligned)
352 if (addr & ~PAGE_MASK) {
353 printk("AGP ioremap failed... addr not page aligned (0x%lx)\n",
355 return (void __iomem *)(addr + IRONGATE_MEM);
357 last = addr + size - 1;
358 size = PAGE_ALIGN(last) - addr;
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);
367 for(baddr = addr; baddr <= last; baddr += PAGE_SIZE)
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",
379 area = get_vm_area(size, VM_IOREMAP);
380 if (!area) return NULL;
382 for(baddr = addr, vaddr = (unsigned long)area->addr;
384 baddr += PAGE_SIZE, vaddr += PAGE_SIZE)
386 cur_gatt = phys_to_virt(GET_GATT(baddr) & ~1);
387 pte = cur_gatt[GET_GATT_OFF(baddr)] & ~1;
389 if (__alpha_remap_area_pages(vaddr,
390 pte, PAGE_SIZE, 0)) {
391 printk("AGP ioremap: FAILED to map...\n");
399 vaddr = (unsigned long)area->addr + (addr & ~PAGE_MASK);
401 printk("irongate_ioremap(0x%lx, 0x%lx) returning 0x%lx\n",
404 return (void __iomem *)vaddr;
406 EXPORT_SYMBOL(irongate_ioremap);
409 irongate_iounmap(volatile void __iomem *xaddr)
411 unsigned long addr = (unsigned long) xaddr;
412 if (((long)addr >> 41) == -2)
413 return; /* kseg map, nothing to do */
415 return vfree((void *)(PAGE_MASK & addr));
417 EXPORT_SYMBOL(irongate_iounmap);