* Patch by Peter Ryser, 20 Feb 2004:
[platform/kernel/u-boot.git] / cpu / ppc4xx / speed.c
1 /*
2  * (C) Copyright 2000
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23
24 #include <common.h>
25 #include <ppc_asm.tmpl>
26 #include <ppc4xx.h>
27 #include <asm/processor.h>
28
29 /* ------------------------------------------------------------------------- */
30
31 #define ONE_BILLION        1000000000
32
33
34 #if defined(CONFIG_405GP) || defined(CONFIG_405CR)
35
36 void get_sys_info (PPC405_SYS_INFO * sysInfo)
37 {
38         unsigned long pllmr;
39         unsigned long sysClkPeriodPs = ONE_BILLION / (CONFIG_SYS_CLK_FREQ / 1000);
40         uint pvr = get_pvr();
41         unsigned long psr;
42         unsigned long m;
43
44         /*
45          * Read PLL Mode register
46          */
47         pllmr = mfdcr (pllmd);
48
49         /*
50          * Read Pin Strapping register
51          */
52         psr = mfdcr (strap);
53
54         /*
55          * Determine FWD_DIV.
56          */
57         sysInfo->pllFwdDiv = 8 - ((pllmr & PLLMR_FWD_DIV_MASK) >> 29);
58
59         /*
60          * Determine FBK_DIV.
61          */
62         sysInfo->pllFbkDiv = ((pllmr & PLLMR_FB_DIV_MASK) >> 25);
63         if (sysInfo->pllFbkDiv == 0) {
64                 sysInfo->pllFbkDiv = 16;
65         }
66
67         /*
68          * Determine PLB_DIV.
69          */
70         sysInfo->pllPlbDiv = ((pllmr & PLLMR_CPU_TO_PLB_MASK) >> 17) + 1;
71
72         /*
73          * Determine PCI_DIV.
74          */
75         sysInfo->pllPciDiv = ((pllmr & PLLMR_PCI_TO_PLB_MASK) >> 13) + 1;
76
77         /*
78          * Determine EXTBUS_DIV.
79          */
80         sysInfo->pllExtBusDiv = ((pllmr & PLLMR_EXB_TO_PLB_MASK) >> 11) + 2;
81
82         /*
83          * Determine OPB_DIV.
84          */
85         sysInfo->pllOpbDiv = ((pllmr & PLLMR_OPB_TO_PLB_MASK) >> 15) + 1;
86
87         /*
88          * Check if PPC405GPr used (mask minor revision field)
89          */
90         if ((pvr & 0xfffffff0) == (PVR_405GPR_RB & 0xfffffff0)) {
91                 /*
92                  * Determine FWD_DIV B (only PPC405GPr with new mode strapping).
93                  */
94                 sysInfo->pllFwdDivB = 8 - (pllmr & PLLMR_FWDB_DIV_MASK);
95
96                 /*
97                  * Determine factor m depending on PLL feedback clock source
98                  */
99                 if (!(psr & PSR_PCI_ASYNC_EN)) {
100                         if (psr & PSR_NEW_MODE_EN) {
101                                 /*
102                                  * sync pci clock used as feedback (new mode)
103                                  */
104                                 m = 1 * sysInfo->pllFwdDivB * 2 * sysInfo->pllPciDiv;
105                         } else {
106                                 /*
107                                  * sync pci clock used as feedback (legacy mode)
108                                  */
109                                 m = 1 * sysInfo->pllFwdDivB * sysInfo->pllPlbDiv * sysInfo->pllPciDiv;
110                         }
111                 } else if (psr & PSR_NEW_MODE_EN) {
112                         if (psr & PSR_PERCLK_SYNC_MODE_EN) {
113                                 /*
114                                  * PerClk used as feedback (new mode)
115                                  */
116                                 m = 1 * sysInfo->pllFwdDivB * 2 * sysInfo->pllExtBusDiv;
117                         } else {
118                                 /*
119                                  * CPU clock used as feedback (new mode)
120                                  */
121                                 m = sysInfo->pllFbkDiv * sysInfo->pllFwdDiv;
122                         }
123                 } else if (sysInfo->pllExtBusDiv == sysInfo->pllFbkDiv) {
124                         /*
125                          * PerClk used as feedback (legacy mode)
126                          */
127                         m = 1 * sysInfo->pllFwdDivB * sysInfo->pllPlbDiv * sysInfo->pllExtBusDiv;
128                 } else {
129                         /*
130                          * PLB clock used as feedback (legacy mode)
131                          */
132                         m = sysInfo->pllFbkDiv * sysInfo->pllFwdDivB * sysInfo->pllPlbDiv;
133                 }
134
135                 sysInfo->freqVCOMhz = (1000000 * m) / sysClkPeriodPs;
136                 sysInfo->freqProcessor = (sysInfo->freqVCOMhz * 1000000) / sysInfo->pllFwdDiv;
137                 sysInfo->freqPLB = (sysInfo->freqVCOMhz * 1000000) /
138                         (sysInfo->pllFwdDivB * sysInfo->pllPlbDiv);
139         } else {
140                 /*
141                  * Check pllFwdDiv to see if running in bypass mode where the CPU speed
142                  * is equal to the 405GP SYS_CLK_FREQ. If not in bypass mode, check VCO
143                  * to make sure it is within the proper range.
144                  *    spec:    VCO = SYS_CLOCK x FBKDIV x PLBDIV x FWDDIV
145                  * Note freqVCO is calculated in Mhz to avoid errors introduced by rounding.
146                  */
147                 if (sysInfo->pllFwdDiv == 1) {
148                         sysInfo->freqProcessor = CONFIG_SYS_CLK_FREQ;
149                         sysInfo->freqPLB = CONFIG_SYS_CLK_FREQ / sysInfo->pllPlbDiv;
150                 } else {
151                         sysInfo->freqVCOMhz = ( 1000000 *
152                                                 sysInfo->pllFwdDiv *
153                                                 sysInfo->pllFbkDiv *
154                                                 sysInfo->pllPlbDiv
155                                 ) / sysClkPeriodPs;
156                         if (sysInfo->freqVCOMhz >= VCO_MIN
157                             && sysInfo->freqVCOMhz <= VCO_MAX) {
158                                 sysInfo->freqPLB = (ONE_BILLION /
159                                                     ((sysClkPeriodPs * 10) /
160                                                      sysInfo->pllFbkDiv)) * 10000;
161                                 sysInfo->freqProcessor = sysInfo->freqPLB * sysInfo->pllPlbDiv;
162                         } else {
163                                 printf ("\nInvalid VCO frequency calculated :  %ld MHz \a\n",
164                                         sysInfo->freqVCOMhz);
165                                 printf ("It must be between %d-%d MHz \a\n",
166                                         VCO_MIN, VCO_MAX);
167                                 printf ("PLL Mode reg           :  %8.8lx\a\n",
168                                         pllmr);
169                                 hang ();
170                         }
171                 }
172         }
173 }
174
175
176 /********************************************
177  * get_OPB_freq
178  * return OPB bus freq in Hz
179  *********************************************/
180 ulong get_OPB_freq (void)
181 {
182         ulong val = 0;
183
184         PPC405_SYS_INFO sys_info;
185
186         get_sys_info (&sys_info);
187         val = sys_info.freqPLB / sys_info.pllOpbDiv;
188
189         return val;
190 }
191
192
193 /********************************************
194  * get_PCI_freq
195  * return PCI bus freq in Hz
196  *********************************************/
197 ulong get_PCI_freq (void)
198 {
199         ulong val;
200         PPC405_SYS_INFO sys_info;
201
202         get_sys_info (&sys_info);
203         val = sys_info.freqPLB / sys_info.pllPciDiv;
204         return val;
205 }
206
207
208 #elif defined(CONFIG_440)
209 #if !defined(CONFIG_440_GX)
210 void get_sys_info (sys_info_t * sysInfo)
211 {
212         unsigned long strp0;
213         unsigned long temp;
214         unsigned long m;
215
216         /* Extract configured divisors */
217         strp0 = mfdcr( cpc0_strp0 );
218         sysInfo->pllFwdDivA = 8 - ((strp0 & PLLSYS0_FWD_DIV_A_MASK) >> 15);
219         sysInfo->pllFwdDivB = 8 - ((strp0 & PLLSYS0_FWD_DIV_B_MASK) >> 12);
220         temp = (strp0 & PLLSYS0_FB_DIV_MASK) >> 18;
221         sysInfo->pllFbkDiv = temp ? temp : 16;
222         sysInfo->pllOpbDiv = 1 + ((strp0 & PLLSYS0_OPB_DIV_MASK) >> 10);
223         sysInfo->pllExtBusDiv = 1 + ((strp0 & PLLSYS0_EPB_DIV_MASK) >> 8);
224
225         /* Calculate 'M' based on feedback source */
226         if( strp0 & PLLSYS0_EXTSL_MASK )
227                 m = sysInfo->pllExtBusDiv * sysInfo->pllOpbDiv * sysInfo->pllFwdDivB;
228         else
229                 m = sysInfo->pllFbkDiv * sysInfo->pllFwdDivA;
230
231         /* Now calculate the individual clocks */
232         sysInfo->freqVCOMhz = (m * CONFIG_SYS_CLK_FREQ) + (m>>1);
233         sysInfo->freqProcessor = sysInfo->freqVCOMhz/sysInfo->pllFwdDivA;
234         sysInfo->freqPLB = sysInfo->freqVCOMhz/sysInfo->pllFwdDivB;
235     if( get_pvr() == PVR_440GP_RB ) /* Rev B divs an extra 2 -- geez! */
236         sysInfo->freqPLB >>= 1;
237         sysInfo->freqOPB = sysInfo->freqPLB/sysInfo->pllOpbDiv;
238         sysInfo->freqEPB = sysInfo->freqOPB/sysInfo->pllExtBusDiv;
239
240 }
241 #else
242 void get_sys_info (sys_info_t * sysInfo)
243 {
244         unsigned long strp0;
245         unsigned long strp1;
246         unsigned long temp;
247         unsigned long temp1;
248         unsigned long lfdiv;
249         unsigned long m;
250
251
252         /* Extract configured divisors */
253         mfsdr( sdr_sdstp0,strp0 );
254         mfsdr( sdr_sdstp1,strp1 );
255
256         temp = ((strp0 & PLLSYS0_FWD_DIV_A_MASK) >> 8);
257         sysInfo->pllFwdDivA = temp ? temp : 16 ;
258         temp = ((strp0 & PLLSYS0_FWD_DIV_B_MASK) >> 5);
259         sysInfo->pllFwdDivB = temp ? temp: 8 ;
260         temp = (strp0 & PLLSYS0_FB_DIV_MASK) >> 12;
261         sysInfo->pllFbkDiv = temp ? temp : 32;
262         temp = (strp0 & PLLSYS0_OPB_DIV_MASK);
263         sysInfo->pllOpbDiv = temp ? temp : 4;
264         temp = (strp1 & PLLSYS1_PERCLK_DIV_MASK) >> 24;
265         sysInfo->pllExtBusDiv = temp ? temp : 4;
266
267         /* Calculate 'M' based on feedback source */
268         temp = (strp0 & PLLSYS0_SEL_MASK) >> 27;
269         temp1 = (strp1 & PLLSYS1_LF_DIV_MASK) >> 26;
270         lfdiv = temp1 ? temp1 : 64;
271         if (temp == 0) { /* PLL output */
272                 /* Figure which pll to use */
273                 temp = (strp0 & PLLSYS0_SRC_MASK) >> 30;
274                 if (!temp)
275                         m = sysInfo->pllFbkDiv * lfdiv * sysInfo->pllFwdDivA;
276                 else
277                         m = sysInfo->pllFbkDiv * lfdiv * sysInfo->pllFwdDivB;
278         }
279         else if (temp == 1) /* CPU output */
280                 m = sysInfo->pllFbkDiv * sysInfo->pllFwdDivA;
281         else /* PerClk */
282                 m = sysInfo->pllExtBusDiv * sysInfo->pllOpbDiv * sysInfo->pllFwdDivB;
283
284         /* Now calculate the individual clocks */
285         sysInfo->freqVCOMhz = (m * CONFIG_SYS_CLK_FREQ) + (m>>1);
286         sysInfo->freqProcessor = sysInfo->freqVCOMhz/sysInfo->pllFwdDivA;
287         sysInfo->freqPLB = sysInfo->freqVCOMhz/sysInfo->pllFwdDivB;
288         sysInfo->freqOPB = sysInfo->freqPLB/sysInfo->pllOpbDiv;
289         sysInfo->freqEPB = sysInfo->freqOPB/sysInfo->pllExtBusDiv;
290
291 }
292 #endif
293
294 ulong get_OPB_freq (void)
295 {
296
297         sys_info_t sys_info;
298         get_sys_info (&sys_info);
299         return sys_info.freqOPB;
300 }
301
302 #elif defined(CONFIG_XILINX_ML300)
303 extern void get_sys_info (sys_info_t * sysInfo);
304 extern ulong get_PCI_freq (void);
305
306 #elif defined(CONFIG_405)
307
308 void get_sys_info (sys_info_t * sysInfo) {
309
310         sysInfo->freqVCOMhz=3125000;
311         sysInfo->freqProcessor=12*1000*1000;
312         sysInfo->freqPLB=50*1000*1000;
313         sysInfo->freqPCI=66*1000*1000;
314
315 }
316
317 #elif defined(CONFIG_405EP)
318 void get_sys_info (PPC405_SYS_INFO * sysInfo)
319 {
320         unsigned long pllmr0;
321         unsigned long pllmr1;
322         unsigned long sysClkPeriodPs = ONE_BILLION / (CONFIG_SYS_CLK_FREQ / 1000);
323         unsigned long m;
324         unsigned long pllmr0_ccdv;
325
326         /*
327          * Read PLL Mode registers
328          */
329         pllmr0 = mfdcr (cpc0_pllmr0);
330         pllmr1 = mfdcr (cpc0_pllmr1);
331
332         /*
333          * Determine forward divider A
334          */
335         sysInfo->pllFwdDiv = 8 - ((pllmr1 & PLLMR1_FWDVA_MASK) >> 16);
336
337         /*
338          * Determine forward divider B (should be equal to A)
339          */
340         sysInfo->pllFwdDivB = 8 - ((pllmr1 & PLLMR1_FWDVB_MASK) >> 12);
341
342         /*
343          * Determine FBK_DIV.
344          */
345         sysInfo->pllFbkDiv = ((pllmr1 & PLLMR1_FBMUL_MASK) >> 20);
346         if (sysInfo->pllFbkDiv == 0) {
347                 sysInfo->pllFbkDiv = 16;
348         }
349
350         /*
351          * Determine PLB_DIV.
352          */
353         sysInfo->pllPlbDiv = ((pllmr0 & PLLMR0_CPU_TO_PLB_MASK) >> 16) + 1;
354
355         /*
356          * Determine PCI_DIV.
357          */
358         sysInfo->pllPciDiv = (pllmr0 & PLLMR0_PCI_TO_PLB_MASK) + 1;
359
360         /*
361          * Determine EXTBUS_DIV.
362          */
363         sysInfo->pllExtBusDiv = ((pllmr0 & PLLMR0_EXB_TO_PLB_MASK) >> 8) + 2;
364
365         /*
366          * Determine OPB_DIV.
367          */
368         sysInfo->pllOpbDiv = ((pllmr0 & PLLMR0_OPB_TO_PLB_MASK) >> 12) + 1;
369
370         /*
371          * Determine the M factor
372          */
373         m = sysInfo->pllFbkDiv * sysInfo->pllFwdDivB;
374
375         /*
376          * Determine VCO clock frequency
377          */
378         sysInfo->freqVCOMhz = (1000000 * m) / sysClkPeriodPs;
379
380         /*
381          * Determine CPU clock frequency
382          */
383         pllmr0_ccdv = ((pllmr0 & PLLMR0_CPU_DIV_MASK) >> 20) + 1;
384         if (pllmr1 & PLLMR1_SSCS_MASK) {
385                 sysInfo->freqProcessor = (CONFIG_SYS_CLK_FREQ * sysInfo->pllFbkDiv)
386                         / pllmr0_ccdv;
387         } else {
388                 sysInfo->freqProcessor = CONFIG_SYS_CLK_FREQ / pllmr0_ccdv;
389         }
390
391         /*
392          * Determine PLB clock frequency
393          */
394         sysInfo->freqPLB = sysInfo->freqProcessor / sysInfo->pllPlbDiv;
395
396         if (!((sysInfo->freqVCOMhz >= VCO_MIN) && (sysInfo->freqVCOMhz <= VCO_MAX))) {
397                 printf ("\nInvalid VCO frequency calculated :  %ld MHz \a\n",
398                         sysInfo->freqVCOMhz);
399                 printf ("It must be between %d-%d MHz \a\n", VCO_MIN, VCO_MAX);
400                 printf ("PLL Mode reg 0           :  %8.8lx\a\n", pllmr0);
401                 printf ("PLL Mode reg 1           :  %8.8lx\a\n", pllmr1);
402                 hang ();
403         }
404 }
405
406
407 /********************************************
408  * get_OPB_freq
409  * return OPB bus freq in Hz
410  *********************************************/
411 ulong get_OPB_freq (void)
412 {
413         ulong val = 0;
414
415         PPC405_SYS_INFO sys_info;
416
417         get_sys_info (&sys_info);
418         val = sys_info.freqPLB / sys_info.pllOpbDiv;
419
420         return val;
421 }
422
423
424 /********************************************
425  * get_PCI_freq
426  * return PCI bus freq in Hz
427  *********************************************/
428 ulong get_PCI_freq (void)
429 {
430         ulong val;
431         PPC405_SYS_INFO sys_info;
432
433         get_sys_info (&sys_info);
434         val = sys_info.freqPLB / sys_info.pllPciDiv;
435         return val;
436 }
437
438 #endif
439
440 int get_clocks (void)
441 {
442 #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_440) || defined(CONFIG_405) || defined(CONFIG_405EP)
443         DECLARE_GLOBAL_DATA_PTR;
444
445         sys_info_t sys_info;
446
447         get_sys_info (&sys_info);
448         gd->cpu_clk = sys_info.freqProcessor;
449         gd->bus_clk = sys_info.freqPLB;
450
451 #endif  /* defined(CONFIG_405GP) || defined(CONFIG_405CR) */
452
453 #ifdef CONFIG_IOP480
454         DECLARE_GLOBAL_DATA_PTR;
455
456         gd->cpu_clk = 66000000;
457         gd->bus_clk = 66000000;
458 #endif
459         return (0);
460 }
461
462
463 /********************************************
464  * get_bus_freq
465  * return PLB bus freq in Hz
466  *********************************************/
467 ulong get_bus_freq (ulong dummy)
468 {
469         ulong val;
470
471 #if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_440) || defined(CONFIG_405EP)
472         sys_info_t sys_info;
473
474         get_sys_info (&sys_info);
475         val = sys_info.freqPLB;
476
477 #elif defined(CONFIG_IOP480)
478
479         val = 66;
480
481 #else
482 # error get_bus_freq() not implemented
483 #endif
484
485         return val;
486 }