Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[pandora-kernel.git] / arch / sparc64 / kernel / central.c
1 /* central.c: Central FHC driver for Sunfire/Starfire/Wildfire.
2  *
3  * Copyright (C) 1997, 1999 David S. Miller (davem@davemloft.net)
4  */
5
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/string.h>
9 #include <linux/timer.h>
10 #include <linux/sched.h>
11 #include <linux/delay.h>
12 #include <linux/init.h>
13 #include <linux/bootmem.h>
14
15 #include <asm/page.h>
16 #include <asm/fhc.h>
17 #include <asm/starfire.h>
18
19 static struct linux_central *central_bus = NULL;
20 static struct linux_fhc *fhc_list = NULL;
21
22 #define IS_CENTRAL_FHC(__fhc)   ((__fhc) == central_bus->child)
23
24 static void central_probe_failure(int line)
25 {
26         prom_printf("CENTRAL: Critical device probe failure at central.c:%d\n",
27                     line);
28         prom_halt();
29 }
30
31 static void central_ranges_init(struct linux_central *central)
32 {
33         struct device_node *dp = central->prom_node;
34         const void *pval;
35         int len;
36         
37         central->num_central_ranges = 0;
38         pval = of_get_property(dp, "ranges", &len);
39         if (pval) {
40                 memcpy(central->central_ranges, pval, len);
41                 central->num_central_ranges =
42                         (len / sizeof(struct linux_prom_ranges));
43         }
44 }
45
46 static void fhc_ranges_init(struct linux_fhc *fhc)
47 {
48         struct device_node *dp = fhc->prom_node;
49         const void *pval;
50         int len;
51         
52         fhc->num_fhc_ranges = 0;
53         pval = of_get_property(dp, "ranges", &len);
54         if (pval) {
55                 memcpy(fhc->fhc_ranges, pval, len);
56                 fhc->num_fhc_ranges =
57                         (len / sizeof(struct linux_prom_ranges));
58         }
59 }
60
61 /* Range application routines are exported to various drivers,
62  * so do not __init this.
63  */
64 static void adjust_regs(struct linux_prom_registers *regp, int nregs,
65                         struct linux_prom_ranges *rangep, int nranges)
66 {
67         int regc, rngc;
68
69         for (regc = 0; regc < nregs; regc++) {
70                 for (rngc = 0; rngc < nranges; rngc++)
71                         if (regp[regc].which_io == rangep[rngc].ot_child_space)
72                                 break; /* Fount it */
73                 if (rngc == nranges) /* oops */
74                         central_probe_failure(__LINE__);
75                 regp[regc].which_io = rangep[rngc].ot_parent_space;
76                 regp[regc].phys_addr -= rangep[rngc].ot_child_base;
77                 regp[regc].phys_addr += rangep[rngc].ot_parent_base;
78         }
79 }
80
81 /* Apply probed fhc ranges to registers passed, if no ranges return. */
82 static void apply_fhc_ranges(struct linux_fhc *fhc,
83                              struct linux_prom_registers *regs,
84                              int nregs)
85 {
86         if (fhc->num_fhc_ranges)
87                 adjust_regs(regs, nregs, fhc->fhc_ranges,
88                             fhc->num_fhc_ranges);
89 }
90
91 /* Apply probed central ranges to registers passed, if no ranges return. */
92 static void apply_central_ranges(struct linux_central *central,
93                                  struct linux_prom_registers *regs, int nregs)
94 {
95         if (central->num_central_ranges)
96                 adjust_regs(regs, nregs, central->central_ranges,
97                             central->num_central_ranges);
98 }
99
100 static void * __init central_alloc_bootmem(unsigned long size)
101 {
102         void *ret;
103
104         ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
105         if (ret != NULL)
106                 memset(ret, 0, size);
107
108         return ret;
109 }
110
111 static unsigned long prom_reg_to_paddr(struct linux_prom_registers *r)
112 {
113         unsigned long ret = ((unsigned long) r->which_io) << 32;
114
115         return ret | (unsigned long) r->phys_addr;
116 }
117
118 static void __init probe_other_fhcs(void)
119 {
120         struct device_node *dp;
121         const struct linux_prom64_registers *fpregs;
122
123         for_each_node_by_name(dp, "fhc") {
124                 struct linux_fhc *fhc;
125                 int board;
126                 u32 tmp;
127
128                 if (dp->parent &&
129                     dp->parent->parent != NULL)
130                         continue;
131
132                 fhc = (struct linux_fhc *)
133                         central_alloc_bootmem(sizeof(struct linux_fhc));
134                 if (fhc == NULL)
135                         central_probe_failure(__LINE__);
136
137                 /* Link it into the FHC chain. */
138                 fhc->next = fhc_list;
139                 fhc_list = fhc;
140
141                 /* Toplevel FHCs have no parent. */
142                 fhc->parent = NULL;
143                 
144                 fhc->prom_node = dp;
145                 fhc_ranges_init(fhc);
146
147                 /* Non-central FHC's have 64-bit OBP format registers. */
148                 fpregs = of_get_property(dp, "reg", NULL);
149                 if (!fpregs)
150                         central_probe_failure(__LINE__);
151
152                 /* Only central FHC needs special ranges applied. */
153                 fhc->fhc_regs.pregs = fpregs[0].phys_addr;
154                 fhc->fhc_regs.ireg = fpregs[1].phys_addr;
155                 fhc->fhc_regs.ffregs = fpregs[2].phys_addr;
156                 fhc->fhc_regs.sregs = fpregs[3].phys_addr;
157                 fhc->fhc_regs.uregs = fpregs[4].phys_addr;
158                 fhc->fhc_regs.tregs = fpregs[5].phys_addr;
159
160                 board = of_getintprop_default(dp, "board#", -1);
161                 fhc->board = board;
162
163                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_JCTRL);
164                 if ((tmp & FHC_JTAG_CTRL_MENAB) != 0)
165                         fhc->jtag_master = 1;
166                 else
167                         fhc->jtag_master = 0;
168
169                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);
170                 printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] %s\n",
171                        board,
172                        (tmp & FHC_ID_VERS) >> 28,
173                        (tmp & FHC_ID_PARTID) >> 12,
174                        (tmp & FHC_ID_MANUF) >> 1,
175                        (fhc->jtag_master ? "(JTAG Master)" : ""));
176                 
177                 /* This bit must be set in all non-central FHC's in
178                  * the system.  When it is clear, this identifies
179                  * the central board.
180                  */
181                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
182                 tmp |= FHC_CONTROL_IXIST;
183                 upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
184         }
185 }
186
187 static void probe_clock_board(struct linux_central *central,
188                               struct linux_fhc *fhc,
189                               struct device_node *fp)
190 {
191         struct device_node *dp;
192         struct linux_prom_registers cregs[3];
193         const struct linux_prom_registers *pr;
194         int nslots, tmp, nregs;
195
196         dp = fp->child;
197         while (dp) {
198                 if (!strcmp(dp->name, "clock-board"))
199                         break;
200                 dp = dp->sibling;
201         }
202         if (!dp)
203                 central_probe_failure(__LINE__);
204
205         pr = of_get_property(dp, "reg", &nregs);
206         if (!pr)
207                 central_probe_failure(__LINE__);
208
209         memcpy(cregs, pr, nregs);
210         nregs /= sizeof(struct linux_prom_registers);
211
212         apply_fhc_ranges(fhc, &cregs[0], nregs);
213         apply_central_ranges(central, &cregs[0], nregs);
214         central->cfreg = prom_reg_to_paddr(&cregs[0]);
215         central->clkregs = prom_reg_to_paddr(&cregs[1]);
216
217         if (nregs == 2)
218                 central->clkver = 0UL;
219         else
220                 central->clkver = prom_reg_to_paddr(&cregs[2]);
221
222         tmp = upa_readb(central->clkregs + CLOCK_STAT1);
223         tmp &= 0xc0;
224         switch(tmp) {
225         case 0x40:
226                 nslots = 16;
227                 break;
228         case 0xc0:
229                 nslots = 8;
230                 break;
231         case 0x80:
232                 if (central->clkver != 0UL &&
233                    upa_readb(central->clkver) != 0) {
234                         if ((upa_readb(central->clkver) & 0x80) != 0)
235                                 nslots = 4;
236                         else
237                                 nslots = 5;
238                         break;
239                 }
240         default:
241                 nslots = 4;
242                 break;
243         };
244         central->slots = nslots;
245         printk("CENTRAL: Detected %d slot Enterprise system. cfreg[%02x] cver[%02x]\n",
246                central->slots, upa_readb(central->cfreg),
247                (central->clkver ? upa_readb(central->clkver) : 0x00));
248 }
249
250 static void ZAP(unsigned long iclr, unsigned long imap)
251 {
252         u32 imap_tmp;
253
254         upa_writel(0, iclr);
255         upa_readl(iclr);
256         imap_tmp = upa_readl(imap);
257         imap_tmp &= ~(0x80000000);
258         upa_writel(imap_tmp, imap);
259         upa_readl(imap);
260 }
261
262 static void init_all_fhc_hw(void)
263 {
264         struct linux_fhc *fhc;
265
266         for (fhc = fhc_list; fhc != NULL; fhc = fhc->next) {
267                 u32 tmp;
268
269                 /* Clear all of the interrupt mapping registers
270                  * just in case OBP left them in a foul state.
271                  */
272                 ZAP(fhc->fhc_regs.ffregs + FHC_FFREGS_ICLR,
273                     fhc->fhc_regs.ffregs + FHC_FFREGS_IMAP);
274                 ZAP(fhc->fhc_regs.sregs + FHC_SREGS_ICLR,
275                     fhc->fhc_regs.sregs + FHC_SREGS_IMAP);
276                 ZAP(fhc->fhc_regs.uregs + FHC_UREGS_ICLR,
277                     fhc->fhc_regs.uregs + FHC_UREGS_IMAP);
278                 ZAP(fhc->fhc_regs.tregs + FHC_TREGS_ICLR,
279                     fhc->fhc_regs.tregs + FHC_TREGS_IMAP);
280
281                 /* Setup FHC control register. */
282                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
283
284                 /* All non-central boards have this bit set. */
285                 if (! IS_CENTRAL_FHC(fhc))
286                         tmp |= FHC_CONTROL_IXIST;
287
288                 /* For all FHCs, clear the firmware synchronization
289                  * line and both low power mode enables.
290                  */
291                 tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF |
292                          FHC_CONTROL_SLINE);
293
294                 upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
295                 upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
296         }
297
298 }
299
300 void __init central_probe(void)
301 {
302         struct linux_prom_registers fpregs[6];
303         const struct linux_prom_registers *pr;
304         struct linux_fhc *fhc;
305         struct device_node *dp, *fp;
306         int err;
307
308         dp = of_find_node_by_name(NULL, "central");
309         if (!dp) {
310                 if (this_is_starfire)
311                         starfire_cpu_setup();
312                 return;
313         }
314
315         /* Ok we got one, grab some memory for software state. */
316         central_bus = (struct linux_central *)
317                 central_alloc_bootmem(sizeof(struct linux_central));
318         if (central_bus == NULL)
319                 central_probe_failure(__LINE__);
320
321         fhc = (struct linux_fhc *)
322                 central_alloc_bootmem(sizeof(struct linux_fhc));
323         if (fhc == NULL)
324                 central_probe_failure(__LINE__);
325
326         /* First init central. */
327         central_bus->child = fhc;
328         central_bus->prom_node = dp;
329         central_ranges_init(central_bus);
330
331         /* And then central's FHC. */
332         fhc->next = fhc_list;
333         fhc_list = fhc;
334
335         fhc->parent = central_bus;
336         fp = dp->child;
337         while (fp) {
338                 if (!strcmp(fp->name, "fhc"))
339                         break;
340                 fp = fp->sibling;
341         }
342         if (!fp)
343                 central_probe_failure(__LINE__);
344
345         fhc->prom_node = fp;
346         fhc_ranges_init(fhc);
347
348         /* Now, map in FHC register set. */
349         pr = of_get_property(fp, "reg", NULL);
350         if (!pr)
351                 central_probe_failure(__LINE__);
352         memcpy(fpregs, pr, sizeof(fpregs));
353
354         apply_central_ranges(central_bus, &fpregs[0], 6);
355         
356         fhc->fhc_regs.pregs = prom_reg_to_paddr(&fpregs[0]);
357         fhc->fhc_regs.ireg = prom_reg_to_paddr(&fpregs[1]);
358         fhc->fhc_regs.ffregs = prom_reg_to_paddr(&fpregs[2]);
359         fhc->fhc_regs.sregs = prom_reg_to_paddr(&fpregs[3]);
360         fhc->fhc_regs.uregs = prom_reg_to_paddr(&fpregs[4]);
361         fhc->fhc_regs.tregs = prom_reg_to_paddr(&fpregs[5]);
362
363         /* Obtain board number from board status register, Central's
364          * FHC lacks "board#" property.
365          */
366         err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_BSR);
367         fhc->board = (((err >> 16) & 0x01) |
368                       ((err >> 12) & 0x0e));
369
370         fhc->jtag_master = 0;
371
372         /* Attach the clock board registers for CENTRAL. */
373         probe_clock_board(central_bus, fhc, fp);
374
375         err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);
376         printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] (CENTRAL)\n",
377                fhc->board,
378                ((err & FHC_ID_VERS) >> 28),
379                ((err & FHC_ID_PARTID) >> 12),
380                ((err & FHC_ID_MANUF) >> 1));
381
382         probe_other_fhcs();
383
384         init_all_fhc_hw();
385 }
386
387 static inline void fhc_ledblink(struct linux_fhc *fhc, int on)
388 {
389         u32 tmp;
390
391         tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
392
393         /* NOTE: reverse logic on this bit */
394         if (on)
395                 tmp &= ~(FHC_CONTROL_RLED);
396         else
397                 tmp |= FHC_CONTROL_RLED;
398         tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF | FHC_CONTROL_SLINE);
399
400         upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
401         upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
402 }
403
404 static inline void central_ledblink(struct linux_central *central, int on)
405 {
406         u8 tmp;
407
408         tmp = upa_readb(central->clkregs + CLOCK_CTRL);
409
410         /* NOTE: reverse logic on this bit */
411         if (on)
412                 tmp &= ~(CLOCK_CTRL_RLED);
413         else
414                 tmp |= CLOCK_CTRL_RLED;
415
416         upa_writeb(tmp, central->clkregs + CLOCK_CTRL);
417         upa_readb(central->clkregs + CLOCK_CTRL);
418 }
419
420 static struct timer_list sftimer;
421 static int led_state;
422
423 static void sunfire_timer(unsigned long __ignored)
424 {
425         struct linux_fhc *fhc;
426
427         central_ledblink(central_bus, led_state);
428         for (fhc = fhc_list; fhc != NULL; fhc = fhc->next)
429                 if (! IS_CENTRAL_FHC(fhc))
430                         fhc_ledblink(fhc, led_state);
431         led_state = ! led_state;
432         sftimer.expires = jiffies + (HZ >> 1);
433         add_timer(&sftimer);
434 }
435
436 /* After PCI/SBUS busses have been probed, this is called to perform
437  * final initialization of all FireHose Controllers in the system.
438  */
439 void firetruck_init(void)
440 {
441         struct linux_central *central = central_bus;
442         u8 ctrl;
443
444         /* No central bus, nothing to do. */
445         if (central == NULL)
446                 return;
447
448         /* OBP leaves it on, turn it off so clock board timer LED
449          * is in sync with FHC ones.
450          */
451         ctrl = upa_readb(central->clkregs + CLOCK_CTRL);
452         ctrl &= ~(CLOCK_CTRL_RLED);
453         upa_writeb(ctrl, central->clkregs + CLOCK_CTRL);
454
455         led_state = 0;
456         init_timer(&sftimer);
457         sftimer.data = 0;
458         sftimer.function = &sunfire_timer;
459         sftimer.expires = jiffies + (HZ >> 1);
460         add_timer(&sftimer);
461 }