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1 /* $Id: central.c,v 1.15 2001/12/19 00:29:51 davem Exp $
2  * central.c: Central FHC driver for Sunfire/Starfire/Wildfire.
3  *
4  * Copyright (C) 1997, 1999 David S. Miller (davem@redhat.com)
5  */
6
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/string.h>
10 #include <linux/timer.h>
11 #include <linux/sched.h>
12 #include <linux/delay.h>
13 #include <linux/init.h>
14 #include <linux/bootmem.h>
15
16 #include <asm/page.h>
17 #include <asm/fhc.h>
18 #include <asm/starfire.h>
19
20 struct linux_central *central_bus = NULL;
21 struct linux_fhc *fhc_list = NULL;
22
23 #define IS_CENTRAL_FHC(__fhc)   ((__fhc) == central_bus->child)
24
25 static void central_probe_failure(int line)
26 {
27         prom_printf("CENTRAL: Critical device probe failure at central.c:%d\n",
28                     line);
29         prom_halt();
30 }
31
32 static void central_ranges_init(struct linux_central *central)
33 {
34         struct device_node *dp = central->prom_node;
35         const void *pval;
36         int len;
37         
38         central->num_central_ranges = 0;
39         pval = of_get_property(dp, "ranges", &len);
40         if (pval) {
41                 memcpy(central->central_ranges, pval, len);
42                 central->num_central_ranges =
43                         (len / sizeof(struct linux_prom_ranges));
44         }
45 }
46
47 static void fhc_ranges_init(struct linux_fhc *fhc)
48 {
49         struct device_node *dp = fhc->prom_node;
50         const void *pval;
51         int len;
52         
53         fhc->num_fhc_ranges = 0;
54         pval = of_get_property(dp, "ranges", &len);
55         if (pval) {
56                 memcpy(fhc->fhc_ranges, pval, len);
57                 fhc->num_fhc_ranges =
58                         (len / sizeof(struct linux_prom_ranges));
59         }
60 }
61
62 /* Range application routines are exported to various drivers,
63  * so do not __init this.
64  */
65 static void adjust_regs(struct linux_prom_registers *regp, int nregs,
66                         struct linux_prom_ranges *rangep, int nranges)
67 {
68         int regc, rngc;
69
70         for (regc = 0; regc < nregs; regc++) {
71                 for (rngc = 0; rngc < nranges; rngc++)
72                         if (regp[regc].which_io == rangep[rngc].ot_child_space)
73                                 break; /* Fount it */
74                 if (rngc == nranges) /* oops */
75                         central_probe_failure(__LINE__);
76                 regp[regc].which_io = rangep[rngc].ot_parent_space;
77                 regp[regc].phys_addr -= rangep[rngc].ot_child_base;
78                 regp[regc].phys_addr += rangep[rngc].ot_parent_base;
79         }
80 }
81
82 /* Apply probed fhc ranges to registers passed, if no ranges return. */
83 void apply_fhc_ranges(struct linux_fhc *fhc,
84                       struct linux_prom_registers *regs,
85                       int nregs)
86 {
87         if (fhc->num_fhc_ranges)
88                 adjust_regs(regs, nregs, fhc->fhc_ranges,
89                             fhc->num_fhc_ranges);
90 }
91
92 /* Apply probed central ranges to registers passed, if no ranges return. */
93 void apply_central_ranges(struct linux_central *central,
94                           struct linux_prom_registers *regs, int nregs)
95 {
96         if (central->num_central_ranges)
97                 adjust_regs(regs, nregs, central->central_ranges,
98                             central->num_central_ranges);
99 }
100
101 void * __init central_alloc_bootmem(unsigned long size)
102 {
103         void *ret;
104
105         ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
106         if (ret != NULL)
107                 memset(ret, 0, size);
108
109         return ret;
110 }
111
112 static unsigned long prom_reg_to_paddr(struct linux_prom_registers *r)
113 {
114         unsigned long ret = ((unsigned long) r->which_io) << 32;
115
116         return ret | (unsigned long) r->phys_addr;
117 }
118
119 static void probe_other_fhcs(void)
120 {
121         struct device_node *dp;
122         const struct linux_prom64_registers *fpregs;
123
124         for_each_node_by_name(dp, "fhc") {
125                 struct linux_fhc *fhc;
126                 int board;
127                 u32 tmp;
128
129                 if (dp->parent &&
130                     dp->parent->parent != NULL)
131                         continue;
132
133                 fhc = (struct linux_fhc *)
134                         central_alloc_bootmem(sizeof(struct linux_fhc));
135                 if (fhc == NULL)
136                         central_probe_failure(__LINE__);
137
138                 /* Link it into the FHC chain. */
139                 fhc->next = fhc_list;
140                 fhc_list = fhc;
141
142                 /* Toplevel FHCs have no parent. */
143                 fhc->parent = NULL;
144                 
145                 fhc->prom_node = dp;
146                 fhc_ranges_init(fhc);
147
148                 /* Non-central FHC's have 64-bit OBP format registers. */
149                 fpregs = of_get_property(dp, "reg", NULL);
150                 if (!fpregs)
151                         central_probe_failure(__LINE__);
152
153                 /* Only central FHC needs special ranges applied. */
154                 fhc->fhc_regs.pregs = fpregs[0].phys_addr;
155                 fhc->fhc_regs.ireg = fpregs[1].phys_addr;
156                 fhc->fhc_regs.ffregs = fpregs[2].phys_addr;
157                 fhc->fhc_regs.sregs = fpregs[3].phys_addr;
158                 fhc->fhc_regs.uregs = fpregs[4].phys_addr;
159                 fhc->fhc_regs.tregs = fpregs[5].phys_addr;
160
161                 board = of_getintprop_default(dp, "board#", -1);
162                 fhc->board = board;
163
164                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_JCTRL);
165                 if ((tmp & FHC_JTAG_CTRL_MENAB) != 0)
166                         fhc->jtag_master = 1;
167                 else
168                         fhc->jtag_master = 0;
169
170                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);
171                 printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] %s\n",
172                        board,
173                        (tmp & FHC_ID_VERS) >> 28,
174                        (tmp & FHC_ID_PARTID) >> 12,
175                        (tmp & FHC_ID_MANUF) >> 1,
176                        (fhc->jtag_master ? "(JTAG Master)" : ""));
177                 
178                 /* This bit must be set in all non-central FHC's in
179                  * the system.  When it is clear, this identifies
180                  * the central board.
181                  */
182                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
183                 tmp |= FHC_CONTROL_IXIST;
184                 upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
185         }
186 }
187
188 static void probe_clock_board(struct linux_central *central,
189                               struct linux_fhc *fhc,
190                               struct device_node *fp)
191 {
192         struct device_node *dp;
193         struct linux_prom_registers cregs[3];
194         const struct linux_prom_registers *pr;
195         int nslots, tmp, nregs;
196
197         dp = fp->child;
198         while (dp) {
199                 if (!strcmp(dp->name, "clock-board"))
200                         break;
201                 dp = dp->sibling;
202         }
203         if (!dp)
204                 central_probe_failure(__LINE__);
205
206         pr = of_get_property(dp, "reg", &nregs);
207         if (!pr)
208                 central_probe_failure(__LINE__);
209
210         memcpy(cregs, pr, nregs);
211         nregs /= sizeof(struct linux_prom_registers);
212
213         apply_fhc_ranges(fhc, &cregs[0], nregs);
214         apply_central_ranges(central, &cregs[0], nregs);
215         central->cfreg = prom_reg_to_paddr(&cregs[0]);
216         central->clkregs = prom_reg_to_paddr(&cregs[1]);
217
218         if (nregs == 2)
219                 central->clkver = 0UL;
220         else
221                 central->clkver = prom_reg_to_paddr(&cregs[2]);
222
223         tmp = upa_readb(central->clkregs + CLOCK_STAT1);
224         tmp &= 0xc0;
225         switch(tmp) {
226         case 0x40:
227                 nslots = 16;
228                 break;
229         case 0xc0:
230                 nslots = 8;
231                 break;
232         case 0x80:
233                 if (central->clkver != 0UL &&
234                    upa_readb(central->clkver) != 0) {
235                         if ((upa_readb(central->clkver) & 0x80) != 0)
236                                 nslots = 4;
237                         else
238                                 nslots = 5;
239                         break;
240                 }
241         default:
242                 nslots = 4;
243                 break;
244         };
245         central->slots = nslots;
246         printk("CENTRAL: Detected %d slot Enterprise system. cfreg[%02x] cver[%02x]\n",
247                central->slots, upa_readb(central->cfreg),
248                (central->clkver ? upa_readb(central->clkver) : 0x00));
249 }
250
251 static void ZAP(unsigned long iclr, unsigned long imap)
252 {
253         u32 imap_tmp;
254
255         upa_writel(0, iclr);
256         upa_readl(iclr);
257         imap_tmp = upa_readl(imap);
258         imap_tmp &= ~(0x80000000);
259         upa_writel(imap_tmp, imap);
260         upa_readl(imap);
261 }
262
263 static void init_all_fhc_hw(void)
264 {
265         struct linux_fhc *fhc;
266
267         for (fhc = fhc_list; fhc != NULL; fhc = fhc->next) {
268                 u32 tmp;
269
270                 /* Clear all of the interrupt mapping registers
271                  * just in case OBP left them in a foul state.
272                  */
273                 ZAP(fhc->fhc_regs.ffregs + FHC_FFREGS_ICLR,
274                     fhc->fhc_regs.ffregs + FHC_FFREGS_IMAP);
275                 ZAP(fhc->fhc_regs.sregs + FHC_SREGS_ICLR,
276                     fhc->fhc_regs.sregs + FHC_SREGS_IMAP);
277                 ZAP(fhc->fhc_regs.uregs + FHC_UREGS_ICLR,
278                     fhc->fhc_regs.uregs + FHC_UREGS_IMAP);
279                 ZAP(fhc->fhc_regs.tregs + FHC_TREGS_ICLR,
280                     fhc->fhc_regs.tregs + FHC_TREGS_IMAP);
281
282                 /* Setup FHC control register. */
283                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
284
285                 /* All non-central boards have this bit set. */
286                 if (! IS_CENTRAL_FHC(fhc))
287                         tmp |= FHC_CONTROL_IXIST;
288
289                 /* For all FHCs, clear the firmware synchronization
290                  * line and both low power mode enables.
291                  */
292                 tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF |
293                          FHC_CONTROL_SLINE);
294
295                 upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
296                 upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
297         }
298
299 }
300
301 void central_probe(void)
302 {
303         struct linux_prom_registers fpregs[6];
304         const struct linux_prom_registers *pr;
305         struct linux_fhc *fhc;
306         struct device_node *dp, *fp;
307         int err;
308
309         dp = of_find_node_by_name(NULL, "central");
310         if (!dp) {
311                 if (this_is_starfire)
312                         starfire_cpu_setup();
313                 return;
314         }
315
316         /* Ok we got one, grab some memory for software state. */
317         central_bus = (struct linux_central *)
318                 central_alloc_bootmem(sizeof(struct linux_central));
319         if (central_bus == NULL)
320                 central_probe_failure(__LINE__);
321
322         fhc = (struct linux_fhc *)
323                 central_alloc_bootmem(sizeof(struct linux_fhc));
324         if (fhc == NULL)
325                 central_probe_failure(__LINE__);
326
327         /* First init central. */
328         central_bus->child = fhc;
329         central_bus->prom_node = dp;
330         central_ranges_init(central_bus);
331
332         /* And then central's FHC. */
333         fhc->next = fhc_list;
334         fhc_list = fhc;
335
336         fhc->parent = central_bus;
337         fp = dp->child;
338         while (fp) {
339                 if (!strcmp(fp->name, "fhc"))
340                         break;
341                 fp = fp->sibling;
342         }
343         if (!fp)
344                 central_probe_failure(__LINE__);
345
346         fhc->prom_node = fp;
347         fhc_ranges_init(fhc);
348
349         /* Now, map in FHC register set. */
350         pr = of_get_property(fp, "reg", NULL);
351         if (!pr)
352                 central_probe_failure(__LINE__);
353         memcpy(fpregs, pr, sizeof(fpregs));
354
355         apply_central_ranges(central_bus, &fpregs[0], 6);
356         
357         fhc->fhc_regs.pregs = prom_reg_to_paddr(&fpregs[0]);
358         fhc->fhc_regs.ireg = prom_reg_to_paddr(&fpregs[1]);
359         fhc->fhc_regs.ffregs = prom_reg_to_paddr(&fpregs[2]);
360         fhc->fhc_regs.sregs = prom_reg_to_paddr(&fpregs[3]);
361         fhc->fhc_regs.uregs = prom_reg_to_paddr(&fpregs[4]);
362         fhc->fhc_regs.tregs = prom_reg_to_paddr(&fpregs[5]);
363
364         /* Obtain board number from board status register, Central's
365          * FHC lacks "board#" property.
366          */
367         err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_BSR);
368         fhc->board = (((err >> 16) & 0x01) |
369                       ((err >> 12) & 0x0e));
370
371         fhc->jtag_master = 0;
372
373         /* Attach the clock board registers for CENTRAL. */
374         probe_clock_board(central_bus, fhc, fp);
375
376         err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);
377         printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] (CENTRAL)\n",
378                fhc->board,
379                ((err & FHC_ID_VERS) >> 28),
380                ((err & FHC_ID_PARTID) >> 12),
381                ((err & FHC_ID_MANUF) >> 1));
382
383         probe_other_fhcs();
384
385         init_all_fhc_hw();
386 }
387
388 static __inline__ void fhc_ledblink(struct linux_fhc *fhc, int on)
389 {
390         u32 tmp;
391
392         tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
393
394         /* NOTE: reverse logic on this bit */
395         if (on)
396                 tmp &= ~(FHC_CONTROL_RLED);
397         else
398                 tmp |= FHC_CONTROL_RLED;
399         tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF | FHC_CONTROL_SLINE);
400
401         upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
402         upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
403 }
404
405 static __inline__ void central_ledblink(struct linux_central *central, int on)
406 {
407         u8 tmp;
408
409         tmp = upa_readb(central->clkregs + CLOCK_CTRL);
410
411         /* NOTE: reverse logic on this bit */
412         if (on)
413                 tmp &= ~(CLOCK_CTRL_RLED);
414         else
415                 tmp |= CLOCK_CTRL_RLED;
416
417         upa_writeb(tmp, central->clkregs + CLOCK_CTRL);
418         upa_readb(central->clkregs + CLOCK_CTRL);
419 }
420
421 static struct timer_list sftimer;
422 static int led_state;
423
424 static void sunfire_timer(unsigned long __ignored)
425 {
426         struct linux_fhc *fhc;
427
428         central_ledblink(central_bus, led_state);
429         for (fhc = fhc_list; fhc != NULL; fhc = fhc->next)
430                 if (! IS_CENTRAL_FHC(fhc))
431                         fhc_ledblink(fhc, led_state);
432         led_state = ! led_state;
433         sftimer.expires = jiffies + (HZ >> 1);
434         add_timer(&sftimer);
435 }
436
437 /* After PCI/SBUS busses have been probed, this is called to perform
438  * final initialization of all FireHose Controllers in the system.
439  */
440 void firetruck_init(void)
441 {
442         struct linux_central *central = central_bus;
443         u8 ctrl;
444
445         /* No central bus, nothing to do. */
446         if (central == NULL)
447                 return;
448
449         /* OBP leaves it on, turn it off so clock board timer LED
450          * is in sync with FHC ones.
451          */
452         ctrl = upa_readb(central->clkregs + CLOCK_CTRL);
453         ctrl &= ~(CLOCK_CTRL_RLED);
454         upa_writeb(ctrl, central->clkregs + CLOCK_CTRL);
455
456         led_state = 0;
457         init_timer(&sftimer);
458         sftimer.data = 0;
459         sftimer.function = &sunfire_timer;
460         sftimer.expires = jiffies + (HZ >> 1);
461         add_timer(&sftimer);
462 }