3
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5
* See file CREDITS for list of people who contributed to this
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.
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.
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,
26
#include <mpc8xx_irq.h>
29
DECLARE_GLOBAL_DATA_PTR;
33
#define TIMER_PERIOD 1000000 /* 1 second clock */
35
static void timer_handler (void *arg);
38
/* Access functions for the Machine State Register */
39
static __inline__ unsigned long get_msr(void)
43
asm volatile("mfmsr %0" : "=r" (msr) :);
47
static __inline__ void set_msr(unsigned long msr)
49
asm volatile("mtmsr %0" : : "r" (msr));
53
* Definitions to access the CPM Timer registers
54
* See 8xx_immap.h for Internal Memory Map layout,
55
* and commproc.h for CPM Interrupt vectors (aka "IRQ"s)
58
typedef struct tid_8xx_cpmtimer_s {
59
int cpm_vec; /* CPM Interrupt Vector for this timer */
60
ushort *tgcrp; /* Pointer to Timer Global Config Reg. */
61
ushort *tmrp; /* Pointer to Timer Mode Register */
62
ushort *trrp; /* Pointer to Timer Reference Register */
63
ushort *tcrp; /* Pointer to Timer Capture Register */
64
ushort *tcnp; /* Pointer to Timer Counter Register */
65
ushort *terp; /* Pointer to Timer Event Register */
72
#define CPMT_CLOCK_DIV 16
73
#define CPMT_MAX_PRESCALER 256
74
#define CPMT_MAX_REFERENCE 65535 /* max. unsigned short */
76
#define CPMT_MAX_TICKS (CPMT_MAX_REFERENCE * CPMT_MAX_PRESCALER)
77
#define CPMT_MAX_TICKS_WITH_DIV (CPMT_MAX_REFERENCE * CPMT_MAX_PRESCALER * CPMT_CLOCK_DIV)
78
#define CPMT_MAX_INTERVAL (CPMT_MAX_TICKS_WITH_DIV / CLOCKRATE)
80
/* For now: always use max. prescaler value */
81
#define CPMT_PRESCALER (CPMT_MAX_PRESCALER)
83
/* CPM Timer Event Register Bits */
84
#define CPMT_EVENT_CAP 0x0001 /* Capture Event */
85
#define CPMT_EVENT_REF 0x0002 /* Reference Counter Event */
87
/* CPM Timer Global Config Register */
88
#define CPMT_GCR_RST 0x0001 /* Reset Timer */
89
#define CPMT_GCR_STP 0x0002 /* Stop Timer */
90
#define CPMT_GCR_FRZ 0x0004 /* Freeze Timer */
91
#define CPMT_GCR_GM_CAS 0x0008 /* Gate Mode / Cascade Timers */
92
#define CPMT_GCR_MASK (CPMT_GCR_RST|CPMT_GCR_STP|CPMT_GCR_FRZ|CPMT_GCR_GM_CAS)
94
/* CPM Timer Mode register */
95
#define CPMT_MR_GE 0x0001 /* Gate Enable */
96
#define CPMT_MR_ICLK_CASC 0x0000 /* Clock internally cascaded */
97
#define CPMT_MR_ICLK_CLK 0x0002 /* Clock = system clock */
98
#define CPMT_MR_ICLK_CLKDIV 0x0004 /* Clock = system clock / 16 */
99
#define CPMT_MR_ICLK_TIN 0x0006 /* Clock = TINx signal */
100
#define CPMT_MR_FRR 0x0008 /* Free Run / Restart */
101
#define CPMT_MR_ORI 0x0010 /* Out. Reference Interrupt En. */
102
#define CPMT_MR_OM 0x0020 /* Output Mode */
103
#define CPMT_MR_CE_DIS 0x0000 /* Capture/Interrupt disabled */
104
#define CPMT_MR_CE_RISE 0x0040 /* Capt./Interr. on rising TIN */
105
#define CPMT_MR_CE_FALL 0x0080 /* Capt./Interr. on falling TIN */
106
#define CPMT_MR_CE_ANY 0x00C0 /* Capt./Interr. on any TIN edge*/
110
* which CPM timer to use - index starts at 0 (= timer 1)
112
#define TID_TIMER_ID 0 /* use CPM timer 1 */
114
void setPeriod (tid_8xx_cpmtimer_t *hwp, ulong interval);
116
static char *usage = "\n[q, b, e, ?] ";
118
int timer (int argc, char *argv[])
120
cpmtimer8xx_t *cpmtimerp; /* Pointer to the CPM Timer structure */
121
tid_8xx_cpmtimer_t hw;
122
tid_8xx_cpmtimer_t *hwp = &hw;
128
/* Pointer to CPM Timer structure */
129
cpmtimerp = &((immap_t *) gd->bd->bi_immr_base)->im_cpmtimer;
131
printf ("TIMERS=0x%x\n", (unsigned) cpmtimerp);
133
/* Initialize pointers depending on which timer we use */
134
switch (TID_TIMER_ID) {
136
hwp->tmrp = &(cpmtimerp->cpmt_tmr1);
137
hwp->trrp = &(cpmtimerp->cpmt_trr1);
138
hwp->tcrp = &(cpmtimerp->cpmt_tcr1);
139
hwp->tcnp = &(cpmtimerp->cpmt_tcn1);
140
hwp->terp = &(cpmtimerp->cpmt_ter1);
141
hwp->cpm_vec = CPMVEC_TIMER1;
144
hwp->tmrp = &(cpmtimerp->cpmt_tmr2);
145
hwp->trrp = &(cpmtimerp->cpmt_trr2);
146
hwp->tcrp = &(cpmtimerp->cpmt_tcr2);
147
hwp->tcnp = &(cpmtimerp->cpmt_tcn2);
148
hwp->terp = &(cpmtimerp->cpmt_ter2);
149
hwp->cpm_vec = CPMVEC_TIMER2;
152
hwp->tmrp = &(cpmtimerp->cpmt_tmr3);
153
hwp->trrp = &(cpmtimerp->cpmt_trr3);
154
hwp->tcrp = &(cpmtimerp->cpmt_tcr3);
155
hwp->tcnp = &(cpmtimerp->cpmt_tcn3);
156
hwp->terp = &(cpmtimerp->cpmt_ter3);
157
hwp->cpm_vec = CPMVEC_TIMER3;
160
hwp->tmrp = &(cpmtimerp->cpmt_tmr4);
161
hwp->trrp = &(cpmtimerp->cpmt_trr4);
162
hwp->tcrp = &(cpmtimerp->cpmt_tcr4);
163
hwp->tcnp = &(cpmtimerp->cpmt_tcn4);
164
hwp->terp = &(cpmtimerp->cpmt_ter4);
165
hwp->cpm_vec = CPMVEC_TIMER4;
169
hwp->tgcrp = &cpmtimerp->cpmt_tgcr;
171
printf ("Using timer %d\n"
172
"tgcr @ 0x%x, tmr @ 0x%x, trr @ 0x%x,"
173
" tcr @ 0x%x, tcn @ 0x%x, ter @ 0x%x\n",
175
(unsigned) hwp->tgcrp,
176
(unsigned) hwp->tmrp,
177
(unsigned) hwp->trrp,
178
(unsigned) hwp->tcrp,
179
(unsigned) hwp->tcnp,
184
*hwp->tgcrp &= ~(CPMT_GCR_MASK << TID_TIMER_ID);
186
/* clear all events */
187
*hwp->terp = (CPMT_EVENT_CAP | CPMT_EVENT_REF);
191
while ((c = getc()) != 'q') {
194
setPeriod (hwp, TIMER_PERIOD); /* Set period and start ticking */
196
/* Install interrupt handler (enable timer in CIMR) */
197
install_hdlr (hwp->cpm_vec, timer_handler, hwp);
199
printf ("Enabling timer\n");
202
*hwp->tgcrp |= (CPMT_GCR_RST << TID_TIMER_ID);
206
printf ("tgcr=0x%x, tmr=0x%x, trr=0x%x,"
207
" tcr=0x%x, tcn=0x%x, ter=0x%x\n",
208
*hwp->tgcrp, *hwp->tmrp, *hwp->trrp,
209
*hwp->tcrp, *hwp->tcnp, *hwp->terp
212
} else if (c == 'e') {
214
printf ("Stopping timer\n");
216
*hwp->tgcrp &= ~(CPMT_GCR_MASK << TID_TIMER_ID);
220
printf ("tgcr=0x%x, tmr=0x%x, trr=0x%x,"
221
" tcr=0x%x, tcn=0x%x, ter=0x%x\n",
222
*hwp->tgcrp, *hwp->tmrp, *hwp->trrp,
223
*hwp->tcrp, *hwp->tcnp, *hwp->terp
226
/* Uninstall interrupt handler */
227
free_hdlr (hwp->cpm_vec);
229
} else if (c == '?') {
231
cpic8xx_t *cpm_icp = &((immap_t *) gd->bd->bi_immr_base)->im_cpic;
232
sysconf8xx_t *siup = &((immap_t *) gd->bd->bi_immr_base)->im_siu_conf;
235
printf ("\ntgcr=0x%x, tmr=0x%x, trr=0x%x,"
236
" tcr=0x%x, tcn=0x%x, ter=0x%x\n",
237
*hwp->tgcrp, *hwp->tmrp, *hwp->trrp,
238
*hwp->tcrp, *hwp->tcnp, *hwp->terp
241
printf ("SIUMCR=0x%08lx, SYPCR=0x%08lx,"
242
" SIMASK=0x%08lx, SIPEND=0x%08lx\n",
249
printf ("CIMR=0x%08lx, CICR=0x%08lx, CIPR=0x%08lx\n",
256
printf ("\nEnter: q - quit, b - start timer, e - stop timer, ? - get status\n");
261
printf ("Stopping timer\n");
262
*hwp->tgcrp &= ~(CPMT_GCR_MASK << TID_TIMER_ID);
263
free_hdlr (hwp->cpm_vec);
270
/* Set period in microseconds and start.
271
* Truncate to maximum period if more than this is requested - but warn about it.
274
void setPeriod (tid_8xx_cpmtimer_t *hwp, ulong interval)
276
unsigned short prescaler;
279
printf ("Set interval %ld us\n", interval);
281
/* Warn if requesting longer period than possible */
282
if (interval > CPMT_MAX_INTERVAL) {
283
printf ("Truncate interval %ld to maximum (%d)\n",
284
interval, CPMT_MAX_INTERVAL);
285
interval = CPMT_MAX_INTERVAL;
288
* Check if we want to use clock divider:
289
* Since the reference counter can be incremented only in integer steps,
290
* we try to keep it as big as possible to allow the resulting period to be
291
* as precise as possible.
293
/* prescaler, enable interrupt, restart after ref count is reached */
294
prescaler = (ushort) ((CPMT_PRESCALER - 1) << 8) |
298
ticks = ((ulong) CLOCKRATE * interval);
300
if (ticks > CPMT_MAX_TICKS) {
301
ticks /= CPMT_CLOCK_DIV;
302
prescaler |= CPMT_MR_ICLK_CLKDIV; /* use system clock divided by 16 */
304
prescaler |= CPMT_MR_ICLK_CLK; /* use system clock without divider */
308
printf ("clock/%d, prescale factor %d, reference %ld, ticks %ld\n",
309
(ticks > CPMT_MAX_TICKS) ? CPMT_CLOCK_DIV : 1,
311
(ticks / CPMT_PRESCALER),
316
/* set prescaler register */
317
*hwp->tmrp = prescaler;
319
/* clear timer counter */
322
/* set reference register */
323
*hwp->trrp = (unsigned short) (ticks / CPMT_PRESCALER);
326
printf ("tgcr=0x%x, tmr=0x%x, trr=0x%x,"
327
" tcr=0x%x, tcn=0x%x, ter=0x%x\n",
328
*hwp->tgcrp, *hwp->tmrp, *hwp->trrp,
329
*hwp->tcrp, *hwp->tcnp, *hwp->terp
335
* Handler for CPMVEC_TIMER1 interrupt
338
void timer_handler (void *arg)
340
tid_8xx_cpmtimer_t *hwp = (tid_8xx_cpmtimer_t *)arg;
342
/* printf ("** TER1=%04x ** ", *hwp->terp); */
344
/* just for demonstration */
347
/* clear all possible events: Ref. and Cap. */
348
*hwp->terp = (CPMT_EVENT_CAP | CPMT_EVENT_REF);