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wdenkc6097192002-11-03 00:24:07 +00001/*
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
36void 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_RA & 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 *********************************************/
180ulong 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 *********************************************/
197ulong 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)
209void get_sys_info (sys_info_t * sysInfo)
210{
211 unsigned long strp0;
212 unsigned long temp;
213 unsigned long m;
214
215 /* Extract configured divisors */
216 strp0 = mfdcr( cpc0_strp0 );
217 sysInfo->pllFwdDivA = 8 - ((strp0 & PLLSYS0_FWD_DIV_A_MASK) >> 15);
218 sysInfo->pllFwdDivB = 8 - ((strp0 & PLLSYS0_FWD_DIV_B_MASK) >> 12);
219 temp = (strp0 & PLLSYS0_FB_DIV_MASK) >> 18;
220 sysInfo->pllFbkDiv = temp ? temp : 16;
221 sysInfo->pllOpbDiv = 1 + ((strp0 & PLLSYS0_OPB_DIV_MASK) >> 10);
222 sysInfo->pllExtBusDiv = 1 + ((strp0 & PLLSYS0_EPB_DIV_MASK) >> 8);
223
224 /* Calculate 'M' based on feedback source */
225 if( strp0 & PLLSYS0_EXTSL_MASK )
226 m = sysInfo->pllExtBusDiv * sysInfo->pllOpbDiv * sysInfo->pllFwdDivB;
227 else
228 m = sysInfo->pllFbkDiv * sysInfo->pllFwdDivA;
229
230 /* Now calculate the individual clocks */
231 sysInfo->freqVCOMhz = (m * CONFIG_SYS_CLK_FREQ) + (m>>1);
232 sysInfo->freqProcessor = sysInfo->freqVCOMhz/sysInfo->pllFwdDivA;
233 sysInfo->freqPLB = sysInfo->freqVCOMhz/sysInfo->pllFwdDivB;
234 if( get_pvr() == PVR_440GP_RB ) /* Rev B divs an extra 2 -- geez! */
235 sysInfo->freqPLB >>= 1;
236 sysInfo->freqOPB = sysInfo->freqPLB/sysInfo->pllOpbDiv;
237 sysInfo->freqEPB = sysInfo->freqOPB/sysInfo->pllExtBusDiv;
238
239}
240
241ulong get_OPB_freq (void)
242{
243
244 sys_info_t sys_info;
245 get_sys_info (&sys_info);
246 return sys_info.freqOPB;
247}
248
249#elif defined(CONFIG_405)
250
251void get_sys_info (sys_info_t * sysInfo) {
252
253 sysInfo->freqVCOMhz=3125000;
254 sysInfo->freqProcessor=12*1000*1000;
255 sysInfo->freqPLB=50*1000*1000;
256 sysInfo->freqPCI=66*1000*1000;
257
258}
259
260#endif
261
262int get_clocks (void)
263{
264#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_440) || defined(CONFIG_405)
265 DECLARE_GLOBAL_DATA_PTR;
266
267 sys_info_t sys_info;
268
269 get_sys_info (&sys_info);
270 gd->cpu_clk = sys_info.freqProcessor;
271 gd->bus_clk = sys_info.freqPLB;
272
273#endif /* defined(CONFIG_405GP) || defined(CONFIG_405CR) */
274
275#ifdef CONFIG_IOP480
276 DECLARE_GLOBAL_DATA_PTR;
277
278 gd->cpu_clk = 66000000;
279 gd->bus_clk = 66000000;
280#endif
281 return (0);
282}
283
284
285/********************************************
286 * get_bus_freq
287 * return PLB bus freq in Hz
288 *********************************************/
289ulong get_bus_freq (ulong dummy)
290{
291 ulong val;
292
293#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_440)
294 sys_info_t sys_info;
295
296 get_sys_info (&sys_info);
297 val = sys_info.freqPLB;
298
299#elif defined(CONFIG_IOP480)
300
301 val = 66;
302
303#else
304# error get_bus_freq() not implemented
305#endif
306
307 return val;
308}