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
44 igcsr32 *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
81 static int
mk_conf_addr(struct pci_bus * pbus,unsigned int device_fn,int where,unsigned long * pci_addr,unsigned char * type1)82 mk_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
102 static int
irongate_read_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * value)103 irongate_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
127 static int
irongate_write_config(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 value)128 irongate_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
158 struct pci_ops irongate_pci_ops =
159 {
160 .read = irongate_read_config,
161 .write = irongate_write_config,
162 };
163
164 int
irongate_pci_clr_err(void)165 irongate_pci_clr_err(void)
166 {
167 unsigned int nmi_ctl=0;
168 unsigned int IRONGATE_jd;
169
170 again:
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. */
201 static void __init
albacore_init_arch(void)202 albacore_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(__pa(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
249 static void __init
irongate_setup_agp(void)250 irongate_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
258 void __init
irongate_init_arch(void)259 irongate_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
312 void __iomem *
irongate_ioremap(unsigned long addr,unsigned long size)313 irongate_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 }
406 EXPORT_SYMBOL(irongate_ioremap);
407
408 void
irongate_iounmap(volatile void __iomem * xaddr)409 irongate_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 }
417 EXPORT_SYMBOL(irongate_iounmap);
418
